Table des matières

Introduction

Efficient bulk material handling is essential for modern ports and terminals where large volumes of cargo need to be loaded and unloaded continuously. An electro hydraulic grab bucket for port bulk material handling uses an electric drive system and hydraulic control technology to provide stable grabbing force, precise operation, and reliable performance for bulk cargo handling. It is widely used for handling coal, ore, sand, grain, scrap steel, and other loose materials in ports, docks, and bulk material transfer facilities.

In this article, I will introduce how electro hydraulic grab buckets work, their main applications, key specifications, and the factors to consider when selecting a suitable model. I will also explain the differences between hydraulic grabs and other grab bucket types, helping you understand how WEIHUA provides customized solutions for different cranes and operating conditions

What Is an Electro Hydraulic Grab Bucket?

An electro hydraulic grab bucket is a crane attachment driven by an electric motor and hydraulic system. It uses hydraulic cylinders to control the opening and closing movement of the grab shells for handling loose bulk materials. It is also known as an electric hydraulic grab or electro-hydraulic grab. It is used in ports, power plants, waste handling facilities, and other applications to replace traditional rope grabs for material loading and unloading.

Different from mechanical rope grabs that rely on the crane hoisting wire ropes to open and close the grab, an electro hydraulic grab bucket has an integrated hydraulic drive system and can complete the grabbing cycle independently without an external hoisting mechanism. The complete unit consists of an electric motor, hydraulic pump, hydraulic cylinders, control system, and grab shell structure. The motor drives the hydraulic pump to generate pressurized oil, which then moves the hydraulic cylinders to open and close the grab shells.

This independent drive design allows the grab bucket to operate without being limited by the crane wire rope arrangement. A single grabbing cycle can usually be completed within 20 seconds, making it suitable for frequent bulk material handling operations. The hydraulic system also provides overload protection. When the grabbing resistance exceeds the set value, the hydraulic oil is returned through the relief valve to prevent damage to structural components.

How Does an Electro Hydraulic Grab Bucket Work?

The working logic of an electro-hydraulic grab bucket is the process of converting electrical energy into hydraulic energy and then into mechanical grabbing force. The power source is integrated into the grab bucket body, and it does not rely on the crane hoisting mechanism. The grab bucket can complete the opening and closing cycle with single-hook suspension.

The working process is as follows:

• Power supply and pressure building: The cable reel supplies power to the grab bucket, and the electric motor drives the hydraulic pump to output pressurized oil.
• Control and distribution: The pressurized oil enters the hydraulic cylinders through the control valve block according to the commands. The pump flow is automatically adjusted according to the working pressure. When the pressure approaches the maximum value, the flow rate approaches zero, reducing overflow heat generation.
• Grabbing operation: The hydraulic cylinders push the grab shells to rotate around the hinge points. The shells close and cut into the material pile to complete the grabbing process. Compared with traditional two-cylinder structures, the four-cylinder structure has a lower overall height, more reasonable force distribution, and a full bucket rate close to 100%.
• Pressure holding and unloading: After the grab bucket is lifted into position, the hydraulic cylinders change direction, and the grab shells open to discharge the materials before entering the next cycle.

With this drive method, the grabbing force is directly provided by the hydraulic system and is not restricted by wire rope winding or hoisting synchronization. The operation rhythm remains stable, and the single cycle time is short. The hydraulic circuit is equipped with overflow protection, preventing impact damage to the equipment when the grab bucket lands on the material pile at any position.

Why Use Electro Hydraulic Grab Bucket for Port Bulk Material Handling?

Port bulk material handling requires grab buckets that can handle frequent operation, different materials, and demanding working conditions. An electro hydraulic grab bucket for port bulk material handling uses an independent hydraulic drive system to provide stable grabbing performance for bulk cargo loading and unloading.

• Self-powered design with single-hook operation: The grab bucket integrates the hydraulic power unit inside the structure and does not require the crane to provide an additional opening and closing hoisting system. It can be installed on tower cranes, ship cranes, unloading machines, overhead cranes, and other lifting equipment.
• Short operation cycle and stable handling process: The hydraulic cylinders directly control the opening and closing of the grab shells. The grabbing action is not affected by wire rope synchronization, allowing the grab bucket to complete loading and unloading operations at a consistent working pace.
• Suitable for various bulk materials: The grab bucket is used for handling fine bulk materials such as fertilizer, grain, coal, iron ore, sand, and gravel. It can also handle irregular materials including scrap steel, pig iron, slag, waste, and stone. The applicable material density range is 0.9–3.0 t/m³.
• Reliable operation in harsh environments: The grab bucket adopts a simple mechanical structure with reliable hydraulic components. Sealing parts and pressure-bearing components are designed for dusty, humid, and impact-load environments commonly found in ports.
• Low maintenance requirements and long service life: The hydraulic system has a mature design, controlled component wear, and simple daily maintenance. Compared with mechanical grab buckets that require regular wire rope replacement, the electro hydraulic grab bucket provides lower long-term operating costs.

Applications of Electro Hydraulic Grab Bucket in Ports

Electro hydraulic grab buckets are widely used in ports and bulk terminals for loading, unloading, and transferring different types of loose materials, including minerals, agricultural products, scrap, and industrial waste.

Coal Terminal Handling

Used for loading and unloading coal between vessels, stockyards, and conveyor systems.

Iron Ore Handling

Suitable for high-density ore loading at bulk cargo terminals and mining ports.

Scrap Steel Handling

Used for grabbing irregular scrap steel and metal materials in recycling and steel facilities.

Grain and Fertilizer Handling

Applied in agricultural terminals for loading and transferring grain, fertilizer, and other fine bulk materials.

Sand and Gravel Handling

Used for river ports and construction material terminals handling sand, stone, and aggregates.

Waste and Slag Handling

Applied in waste treatment plants and industrial sites for handling slag, waste, and other loose materials.

Orange peel grab buckets are widely used in various industries and are particularly suitable for handling irregularly shaped metal. Steel is one of the most common materials handled; for specific applications, read the article: Hydraulic Orange Peel Grab Bucket for Scrap

Electro Hydraulic Grab Bucket Types for Bulk Material Handling

Electro hydraulic grab buckets are available in different structures according to material characteristics and handling requirements. The main types include clamshell grabs and orange peel grabs, which are selected based on material density, shape, and loading conditions.

Electro Hydraulic Clamshell Grab

Un electro hydraulic clamshell grab uses two bucket shells driven by hydraulic cylinders to open and close for bulk material handling. It features a large grabbing volume, good filling performance, and a closed shell structure that reduces material leakage during lifting. It is mainly used for loose and fine-grained bulk materials.

Applications :

• Coal
• Iron ore
• Grain
• Fertilizer
• Sand and gravel
• Limestone

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Electro Hydraulic Orange Peel Grab

Un electro hydraulic orange peel grab uses multiple curved tines to grip irregular and heavy materials. The tine structure provides strong penetration and holding force for materials with large size variations and uneven shapes. It is commonly used for heavy-duty handling operations.

Applications :

• Scrap steel
• Pig iron
• Steel blocks
• Slag
• Rocks
• Waste materials

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Specifications of Electro Hydraulic Grab Bucket

The main specifications of an electro hydraulic grab bucket vary according to crane type, material characteristics, and operating conditions.

WEIHUA provides customized electro hydraulic grab buckets based on crane specifications, material properties, capacity requirements, and working conditions to match different bulk material handling applications.

Electro Hydraulic Grab Bucket vs Mechanical Grab Bucket

Electro hydraulic grab buckets and mechanical grabs are the two most common types of lifting attachments used in bulk material handling. The core difference lies in the power source: one has an integrated hydraulic drive system, while the other is driven by the crane wire ropes.

Mechanical grabs have advantages in simple structure, no electrical or hydraulic components, strong durability, and suitability for conventional bulk materials and applications with limited budgets. However, for high-viscosity materials or high-frequency operations, the independent drive system and stable grabbing force of electro hydraulic grab buckets provide more obvious advantages, and the maintenance cost during long-term operation is more controllable.

During selection, the main factors include material characteristics, crane configuration, and operating intensity. The two types do not have an absolute replacement relationship.

The above provides only a general overview of the differences between the two. For more detailed information, please refer to the article: “Mechanical Clamshell Grab Bucket vs. Hydraulic Grab Bucket: What Is the Difference?”

How to Choose an Electro Hydraulic Grab Bucket for Port Operations?

Choosing an electro hydraulic grab bucket for port operations requires matching the grab design with the material, crane parameters, and working conditions. The selection directly affects grabbing performance, operation cycle, and equipment service life.

1. Check the Material Characteristics

Different materials require different grab structures and closing forces. Clamshell grabs are suitable for loose bulk materials, while orange peel grabs are used for irregular and heavy materials.

Common materials: Coal, Iron ore, Sand and gravel, Grain, Fertilizer, Scrap steel, and Slag.

2. Match the Grab Capacity with the Crane

The grab capacity should match the crane lifting capacity and working load. The total weight of the grab and loaded material must stay within the crane’s rated capacity.

Factors:

• Crane lifting capacity
• Grab self-weight
• Material density
• Required handling volume

3. Consider the Working Environment

Port operations involve dust, moisture, salt spray, and continuous loading cycles. The grab structure and hydraulic components should be suitable for these conditions.

Consider:

• Corrosion protection
• Working frequency
• Ambient temperature
• Material impact

4. Select a Suitable Drive and Control System

The electro hydraulic grab bucket uses an integrated hydraulic drive unit. The power supply and control system should match the crane configuration.

Selection factors:

• Crane power supply
• Control interface
• Operation method
• Maintenance requirements

5. Choose a Manufacturer with Customization Capability

Port handling conditions vary from project to project. The manufacturer should customize the grab capacity, shell structure, hydraulic system, and crane connection according to the actual application.

WEIHUA supplies customized electro hydraulic grab buckets for ports, bulk terminals, steel plants, and other industrial applications based on crane specifications and material handling requirements.

Conclusion

Electro hydraulic grab buckets are designed for port bulk material handling applications that require strong grabbing force, stable control, and frequent loading cycles. With an integrated hydraulic drive system, they can handle various bulk materials such as coal, ore, sand, grain, and scrap steel.

WEIHUA supplies customized electro hydraulic grab buckets for different crane types and material handling conditions. The grab capacity, structure, and hydraulic system can be configured according to specific project requirements. Contactez-nous for customized electro hydraulic grab bucket solutions.

FAQ

What is an electro hydraulic grab bucket?

An electro hydraulic grab bucket is a crane attachment powered by an electric motor and hydraulic system. It uses hydraulic cylinders to control the opening and closing of grab shells for loading, unloading, and transferring loose bulk materials.

What materials can an electro hydraulic grab bucket handle?

An electro hydraulic grab bucket can handle coal, iron ore, sand, gravel, grain, fertilizer, scrap steel, slag, waste, and other bulk materials. The suitable grab type depends on material density, particle size, and handling conditions.

What is the capacity of an electro hydraulic grab bucket?

The capacity of an electro hydraulic grab bucket is typically 0.5–30 m³. The actual capacity depends on the crane lifting capacity, material density, grab structure, and required handling volume. Customized sizes are available for different port and industrial applications.

What is the difference between hydraulic grab and mechanical grab?

A hydraulic grab uses an integrated hydraulic system to control opening and closing, while a mechanical grab relies on crane wire ropes. Hydraulic grabs provide independent operation and stronger control, while mechanical grabs feature a simpler structure and lower initial cost.

Can electro hydraulic grabs be used for port cranes?

Yes. Electro hydraulic grabs can be installed on port cranes, ship cranes, portal cranes, unloading machines, and overhead cranes. They are commonly used for bulk cargo handling operations such as ship unloading, stockyard transfer, and terminal loading.

How does a hydraulic grab bucket improve bulk handling efficiency?

A hydraulic grab bucket uses direct cylinder-driven movement to provide stable grabbing force and accurate opening and closing control. It reduces dependence on wire rope synchronization and supports continuous loading and unloading operations in ports and industrial facilities.

Can WEIHUA customize electro hydraulic grab buckets?

Yes. WEIHUA provides customized electro hydraulic grab buckets based on crane type, material characteristics, capacity requirements, and working conditions. The grab structure, hydraulic system, and connection design can be adjusted for different bulk material handling projects.

What industries use electro hydraulic grab buckets?

Electro hydraulic grab buckets are used in ports, bulk terminals, power plants, steel plants, mines, waste treatment facilities, and other industries. They are used for handling coal, ore, scrap, grain, slag, and other loose materials.

Table des matières

Introduction

Scrap steel handling requires grabbing equipment that can deal with irregular shapes, uneven weight distribution, and heavy loads. A hydraulic orange peel grab bucket for scrap steel handling uses hydraulic cylinders and multiple tines to provide stable gripping force for lifting and transferring scrap steel, metal blocks, slag, and other irregular materials. It is widely used in steel plants, scrap yards, ports, and recycling facilities.

In this article, I will introduce how hydraulic orange peel grab buckets work, their main structures, suitable applications, key specifications, and the factors to consider when selecting a suitable model. I will also compare orange peel grabs with other grab types and explain how WEIHUA provides customized solutions for different cranes and scrap handling conditions.

What Is a Hydraulic Orange Peel Grab Bucket?

A hydraulic orange peel grab bucket is a crane attachment that uses hydraulic cylinders to drive multiple curved tine shells for opening and closing. It is used for grabbing, lifting, and unloading irregular bulk materials. It is also known as an orange peel grab or multi-tine grab, named after the tine sections that resemble orange peel shapes.

Different from two-shell clamshell grabs, hydraulic orange peel grabs usually use 3, 6, or 8 tines, with each tine driven by a hydraulic cylinder. The structure includes hydraulic cylinders, tine shells, a hydraulic power unit, a control system, and wear-resistant parts. The pointed tine tips improve penetration into material piles, while Q345B steel and Hardox 450 wear plates are commonly used for heavy-duty operation.

The grab bucket integrates a hydraulic system and can operate after being connected to the crane power and control system. It can be installed on tower cranes, ship cranes, unloading machines, and overhead cranes. Orange peel grabs are designed for scrap steel, pig iron, ore, slag, stones, and waste handling, while clamshell grabs are mainly used for loose bulk materials. A 360° hydraulic rotation function is also available for operations in narrow areas such as ship holds and storage yards.

For more details, see: Godet hydraulique à écorce d'orange

How Does a Hydraulic Orange Peel Grab Bucket Work?

A hydraulic orange peel grab bucket works by distributing hydraulic power to each tine cylinder to control synchronous opening and closing. The grab bucket has an integrated hydraulic system and can operate after connecting to the crane power supply, without additional pipelines.

The hydraulic drive system provides direct control of tine movement. The grabbing process is not affected by wire rope winding, providing stable cycles and reliable operation in dusty and impact environments.

Why Use Hydraulic Orange Peel Grab Bucket for Scrap Steel Handling?

Scrap steel has irregular shapes, uneven weight distribution, and heavy pieces, which require strong gripping performance. Hydraulic orange peel grab buckets are designed for these conditions and are widely used in steel plants, scrap yards, ports, and recycling facilities.

Hydraulic orange peel grab buckets provide stable gripping, wear resistance, and flexible control for scrap steel handling applications with high working intensity.

Applications of Hydraulic Orange Peel Grab Bucket

Hydraulic orange peel grab buckets are mainly used for handling heavy, irregular, and difficult-to-grab materials. They are commonly applied in steel plants, ports, recycling facilities, and industrial sites where strong gripping force is required.

Steel Plants

Used for loading and transferring scrap steel, steel blocks, and slag during steel production.

Scrap Yards

Used for sorting, loading, and moving mixed scrap metal with different shapes and sizes.

Ports and Terminals

Used for loading and unloading scrap steel, metal blocks, and other bulk cargo from ships.

Recycling Facilities

Used for handling waste metal, crushed scrap, and recyclable materials.

Foundries

Used for moving pig iron, metal residues, and casting waste.

Waste Treatment Plants

Used for grabbing industrial waste, construction waste, and heavy irregular materials.

Orange peel grab buckets are widely used in various industries and are particularly suitable for handling irregularly shaped metal. Steel is one of the most common materials handled; for specific applications, read the article: Hydraulic Orange Peel Grab Bucket for Scrap

Hydraulic Orange Peel Grab Bucket Types

Hydraulic orange peel grab buckets are available with different tine structures to match material size, shape, and handling requirements. The main differences are the number of tines, closing gap, and gripping area. 4-tine designs are suitable for large scrap pieces, while multi-tine and closed structures provide better retention for smaller or mixed materials.

4-Tine Orange Peel Grab

A 4-tine orange peel grab has a wider opening and larger gaps between tines. The structure provides strong penetration and gripping force for large and heavy scrap pieces, where a wider tine spacing helps the grab enter and hold bulky materials.

Caractéristiques :

• Large opening size
• Strong penetration for bulky materials
• Suitable for heavy-duty handling

Applications :

• Heavy scrap steel
• Steel blocks
• Large metal pieces

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5–6 Tine Orange Peel Grab

A 5–6 tine orange peel grab provides a balanced grip between opening size and material retention. The additional tines improve contact with the load and are commonly used for mixed scrap handling and recycling operations.

Caractéristiques :

• Balanced gripping force
• Common industrial configuration
• Suitable for mixed-size materials

Applications :

• Mixed scrap steel
• Steel recycling
• Metal waste

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Closed Orange Peel Grab

A closed orange peel grab uses smaller gaps between tines to reduce material loss during lifting. It is designed for smaller pieces and loose materials that require better retention after closing.

Caractéristiques :

• Small gaps between tines
• Better material retention
• Suitable for fine and fragmented materials

Applications :

• Shredded scrap
• Metal particles
• Small steel pieces

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WEIHUA can customize hydraulic orange peel grab buckets with different tine numbers, capacities, and structures according to material characteristics, crane specifications, and working conditions.

Specifications of Hydraulic Orange Peel Grab Bucket

The specifications of a hydraulic orange peel grab bucket depend on the crane type, material characteristics, and working conditions. The following parameters are commonly considered for scrap steel handling applications.

WEIHUA can customize hydraulic orange peel grab buckets according to scrap type, crane capacity, grab volume, tine structure, and working conditions to match different heavy-duty material handling requirements.

Hydraulic Orange Peel Grab Bucket vs Clamshell Grab Bucket

Hydraulic orange peel grabs and clamshell grabs are both used for bulk material handling, but they are designed for different material types. Orange peel grabs focus on irregular and heavy materials, while clamshell grabs are mainly used for loose bulk materials.

Hydraulic orange peel grab buckets are suitable for scrap steel and heavy irregular materials that require strong gripping force. Clamshell grabs are more suitable for regular loose materials with high filling efficiency. The selection depends on material type, crane configuration, and operating conditions.

Differences and Applications of Various Types of Grab Buckets—For more details, see: Différents types de godets preneuses pour grues et comment choisir le bon

How to Choose a Hydraulic Orange Peel Grab Bucket for Scrap Steel Handling?

Choosing a hydraulic orange peel grab bucket for scrap steel handling requires matching the grab structure with scrap characteristics, crane capacity, and working conditions. The correct selection affects gripping performance, operation efficiency, and service life.

1. Check Scrap Material Type

Different scrap materials require different tine structures and gripping forces.

Consider:

• Scrap size and shape
• Material weight
• Surface condition

Large steel blocks require stronger penetration force, while shredded scrap requires a tighter tine structure to reduce material loss.

2. Match the Grab Capacity with the Crane

The grab capacity should match the crane lifting capacity and working load.

Main factors include:

• Crane rated load
• Grab self-weight
• Scrap density
• Required handling volume

3. Select the Right Tine Structure

The number and design of tines affect material holding performance.

• 4-tine grab: suitable for large and heavy scrap pieces
• 5–6-tine grab: suitable for mixed scrap handling
• Closed orange peel grab: suitable for small scrap and metal particles

4. Consider the Working Environment

Scrap handling areas often involve impact, dust, and continuous operation. The grab should use wear-resistant materials and protected hydraulic components for these conditions.

5. Choose a Customized Solution

Scrap steel varies between projects. The manufacturer should customize the grab capacity, tine structure, hydraulic system, and crane connection according to the actual application.

WEIHUA provides customized hydraulic orange peel grab buckets for steel plants, ports, and recycling facilities based on scrap type, crane specifications, and operating requirements.

Hydraulic grabs are widely used in port material handling. For details on materials and how to select the appropriate equipment, please refer to the article: “Electro Hydraulic Grab Bucket for Port Bulk Material Handling.”

Why Choose WEIHUA Hydraulic Orange Peel Grab Bucket?

WEIHUA provides hydraulic orange peel grab buckets for scrap steel handling, bulk material transfer, and heavy-duty industrial applications. The grab structure, hydraulic system, and capacity can be customized according to material characteristics, crane specifications, and operating conditions.

Customized Design for Different Applications

WEIHUA designs orange peel grab buckets based on scrap type, material weight, handling volume, and working environment. Different tine structures, grab capacities, and hydraulic rotation options are available for steel plants, ports, and recycling facilities.

Compatible with Various Crane Types

WEIHUA can provide hydraulic orange peel grab buckets matched with different crane systems, including:

Portal cranes

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Ship cranes

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Ponts roulants

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Gantry cranes

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The grab connection, hydraulic system, and control mode can be configured according to the crane model.

Heavy-Duty Structure for Scrap Handling

The grab body uses wear-resistant materials and reinforced structures for handling scrap steel, steel blocks, slag, and other heavy materials. Key components are designed for impact loads and continuous operation.

Reliable Hydraulic System

WEIHUA uses a hydraulic drive system with protected cylinders and reliable hydraulic components. The system provides stable tine movement and consistent gripping performance in dusty and high-load working conditions.

Project Support and After-Sales Service

WEIHUA provides engineering support, production inspection, export service, and after-sales assistance for customers in ports, steel plants, and recycling facilities.

Contactez-nous for customized hydraulic orange peel grab bucket solutions for your scrap steel handling requirements.

FAQ

Table des matières

Introduction

Mechanical clamshell grab buckets and hydraulic grab buckets differ mainly in their drive systems, control methods, and application scenarios. Both are crane-mounted material handling attachments used for grabbing and transferring bulk materials. A mechanical clamshell grab bucket uses crane wire ropes to control the opening and closing of the bucket shells, while a hydraulic grab bucket uses a hydraulic system and cylinders to operate the grab.

This article compares mechanical clamshell grab buckets vs. hydraulic grab buckets based on working principles, structural design, material handling applications, maintenance requirements, and selection considerations. I will explain the differences between these two grab bucket types and provide practical guidance for choosing the right solution according to material characteristics, working conditions, and crane configurations.

What Is a Mechanical Clamshell Grab Bucket?

A mechanical clamshell grab bucket, also called a mechanical grab bucket, rope grab, or clamshell grab, is a crane attachment designed for grabbing, transporting, and discharging bulk materials. It operates through the crane’s wire rope system without a hydraulic power unit. The opening and closing movement is controlled by the crane drums, which makes it a reliable solution for bulk material handling applications.

How Does a Mechanical Clamshell Grab Bucket Work?

A mechanical clamshell grab bucket works through a rope-driven opening and closing mechanism connected to the crane hoisting system.

The working cycle includes:

1. The support rope lifts and moves the grab to the material pile.
2. The closing rope pulls the two bucket shells together.
3. The closed shells capture and hold the bulk material.
4. The opening mechanism releases the material at the unloading position.

The most common design is a two-rope grab, which uses a support rope and a closing rope controlled by separate crane drums. A four-rope grab combines two sets of rope systems to provide higher stability and lifting performance.

This mechanical structure allows the grab to operate without additional hydraulic equipment. It is commonly installed on cranes equipped with suitable rope mechanisms for continuous bulk material handling.

Main Features of Mechanical Clamshell Grab Bucket

Mechanical clamshell grab buckets are designed for simple operation and reliable performance in standard bulk handling conditions.

A mechanical clamshell grab bucket uses the crane’s rope system to control grabbing and releasing operations. Its simple structure, low maintenance requirements, and compatibility with different cranes make it suitable for high-volume bulk material handling. It is widely used for materials such as coal, ore, sand, and grain in ports, plants, and industrial facilities.

What Is a Hydraulic Grab Bucket?

A hydraulic grab bucket, also called a hydraulic clamshell grab, hydraulic grab, or electro-hydraulic grab, is a crane attachment that uses hydraulic cylinders and a hydraulic power system to open, close, and control the grabbing force of the bucket shells. Compared with mechanical clamshell grab buckets, hydraulic grabs have an independent drive system, allowing more flexible operation for different materials and working conditions.

How Does a Hydraulic Grab Bucket Work?

A hydraulic grab bucket operates through a hydraulic system that supplies pressure to the cylinders installed on the grab body. The hydraulic cylinders drive the bucket shells to open and close, allowing the operator to control the grabbing action according to the material condition.

The working cycle includes:

1. The crane positions the grab above the material pile.
2. The hydraulic system activates the cylinders to open the bucket shells.
3. The shells close and apply gripping force to capture the material.
4. The crane moves the loaded grab to the discharge area.
5. The hydraulic system opens the shells to release the material.

The hydraulic system provides independent control of the grab movement. The operator can adjust the opening and closing action according to material size, shape, and density, which improves handling flexibility in demanding applications.

Main Features of Hydraulic Grab Bucket

Hydraulic grab buckets are designed for applications that require stronger gripping ability and more precise control.

A hydraulic grab bucket uses hydraulic cylinders and a dedicated hydraulic system to control opening, closing, and gripping operations. Its adjustable control, strong gripping capability, and flexible application range make it suitable for heavy, irregular, and demanding material handling tasks. Hydraulic grabs are commonly selected for industries such as steel, recycling, mining, and port operations where mechanical grabs may have limited adaptability.

Hydraulic grabs are widely used in port material handling. For details on materials and how to select the appropriate equipment, please refer to the article: “Electro Hydraulic Grab Bucket for Port Bulk Material Handling.”

Mechanical Clamshell Grab Bucket vs Hydraulic Grab Bucket: Comparison

The key difference between a mechanical clamshell grab bucket and a hydraulic grab bucket is the drive system. Mechanical grabs use crane wire ropes for opening and closing, while hydraulic grabs use an independent hydraulic system. This difference affects structure, maintenance, gripping performance, and applications.

Mechanical clamshell grab buckets are suitable for continuous bulk handling due to their simple structure and reliable operation. Hydraulic grab buckets provide better control and stronger gripping performance for heavy or irregular materials.

A simple selection rule is to use mechanical grabs for loose bulk materials and hydraulic grabs for heavy or irregular materials. The final choice depends on material type, crane configuration, and working conditions.

Differences Between Mechanical and Hydraulic Grab Buckets

The main differences between mechanical and hydraulic grab buckets are related to their drive systems, material handling performance, operation methods, and maintenance requirements. Mechanical grabs rely on the crane structure for movement, while hydraulic grabs use an independent power system for more flexible control.

1. Drive System Difference

• A mechanical clamshell grab bucket operates through the crane’s wire rope system. The support rope lifts the grab, and the closing rope controls the opening and closing of the bucket shells. The grab movement depends on the crane’s hoisting mechanism.
• A hydraulic grab bucket uses hydraulic cylinders powered by a hydraulic power unit. The hydraulic system directly controls the bucket shells, providing independent operation without relying on crane rope mechanisms.

2. Material Handling Difference

Mechanical and hydraulic grab buckets are designed for different material conditions.

The stronger gripping force of hydraulic grabs allows them to handle materials that require more control during grabbing.

3. Operation and Control Difference

• A mechanical grab bucket is controlled through crane movement. The operator adjusts lifting and closing actions by controlling the crane drums and rope system.
• A hydraulic grab bucket is controlled through the hydraulic system. The operator can directly adjust the opening and closing movement, allowing more precise control during material handling.

4. Maintenance Difference

• Mechanical grab buckets have fewer components because they do not include hydraulic systems. Routine maintenance mainly focuses on ropes, pins, shells, and wear parts.
• Hydraulic grab buckets require additional maintenance for hydraulic components, including hydraulic seals, Cylinders, Hydraulic hoses, and hydraulic system inspection. Regular hydraulic maintenance helps maintain stable performance in heavy-duty applications.

Mechanical Clamshell Grab Bucket vs Hydraulic Grab Bucket: Which One Should You Choose?

The right grab bucket depends on the material type, crane configuration, and working conditions. Mechanical clamshell grab buckets are suitable for standard bulk handling operations that require a simple structure and reliable performance. Hydraulic grab buckets provide more flexibility for heavy-duty applications where stronger gripping force and precise control are needed.

Before selecting a grab bucket, consider the material characteristics, lifting capacity, working frequency, and crane system. A properly matched grab bucket improves handling efficiency and reduces maintenance requirements during operation.

Applications of Mechanical and Hydraulic Grab Buckets

Mechanical and hydraulic grab buckets are used in different industries based on material characteristics and operating requirements. Mechanical grabs are commonly selected for continuous bulk material handling, while hydraulic grabs are used for heavy, irregular, and demanding materials.

Mechanical Clamshell Grab Bucket Applications

Ports

Used for loading and unloading bulk cargo such as coal, ore, and sand.

Coal Terminals

Suitable for continuous coal transfer with high-volume handling requirements.

Grain Terminals

Used for efficient handling of grain and other free-flowing agricultural materials.

Sand and Gravel Yards

Handles loose construction materials during storage and transportation operations.

Mining Operations

Used for transferring bulk minerals and ores in mining facilities.

centrales électriques

Applied in fuel handling systems for coal, ash, and other bulk materials.

Hydraulic Grab Bucket Applications

Scrap Yards

Designed for grabbing irregular scrap metal with strong closing force.

Steel Plants

Used for handling steel scrap, metal blocks, and heavy production materials.

Waste Treatment Plants

Suitable for moving mixed waste materials with different shapes and sizes.

Recycling Facilities

Provides flexible handling of metal waste and recyclable materials.

Quarries

Used for loading rocks, stone blocks, and heavy mineral materials.

Heavy Material Handling

Applied in ports, construction sites, and industrial areas requiring high gripping performance.

For details on the different applications and classifications of grab buckets, see: Différents types de godets preneuses pour grues et comment choisir le bon

How to Choose the Right Crane Grab Bucket?

Choosing the right crane grab bucket requires matching the grab type with the material, crane system, and job conditions. The following factors are the main considerations during selection.

1. Material Type — Material properties determine the suitable grab design. Mechanical clamshell grabs are used for loose materials such as coal, sand, and grain. Hydraulic grabs are used for scrap steel, rocks, and irregular materials.

2. Crane Configuration — The grab bucket must fit the crane’s lifting capacity, rope system, and operating setup. Mechanical grabs require suitable rope arrangements, while hydraulic grabs require a compatible hydraulic power system.

3. Working Frequency — The operating cycle affects grab selection. Mechanical grabs are commonly used for continuous bulk loading and unloading. Hydraulic grabs are suitable for operations that require frequent adjustment and flexible handling.

4. Bucket Capacity — Bucket capacity should match the material density and crane load capacity. The correct capacity helps maintain stable operation and prevents excessive load on the crane system.

5. Operating Conditions — The working environment affects grab structure and material selection. Ports, steel plants, mines, and recycling facilities may require wear-resistant designs for long-term operation.

The right crane grab bucket is selected based on material type, crane specifications, bucket capacity, and working conditions. A properly matched grab improves handling performance and extends service life in industrial applications.

Conclusion

Mechanical clamshell grab buckets are suitable for simple and continuous bulk material handling, while hydraulic grab buckets provide more flexibility for complex materials and demanding working conditions. The choice between the two types depends on material properties, crane configuration, operating frequency, and project requirements.

WEIHUA supplies customized mechanical clamshell grab buckets and hydraulic grab buckets for ports, mines, steel plants, and bulk material handling projects. Contact WEIHUA for grab bucket solutions matched to your crane type, material characteristics, and working conditions.

FAQ

Table des matières

Introduction

Choosing the right grab bucket for overhead crane and gantry crane depends on the material type, crane specifications, bucket capacity, and working conditions. A grab bucket is a crane attachment used for grabbing, lifting, and discharging bulk materials. Overhead cranes and gantry cranes are widely used in industrial material handling, with different grab bucket designs matched to different materials and operating requirements.

In this guide, I will explain how to select the right grab bucket for overhead cranes and gantry cranes by covering grab bucket types, material requirements, crane compatibility, capacity selection, and application conditions. The information helps buyers understand the differences between mechanical and hydraulic grabs and choose a suitable solution for their handling operations.

What Is a Grab Bucket for Overhead Crane and Gantry Crane?

A grab bucket for overhead crane and gantry crane is a crane attachment used for grabbing, lifting, transporting, and discharging bulk materials. It is designed for handling loose and heavy materials in industrial applications such as ports, steel plants, power plants, and mining facilities.

A grab bucket is installed on an overhead crane or gantry crane through a hook or trolley system. Mechanical grab buckets use the crane’s wire rope mechanism to control opening and closing, while hydraulic grab buckets use hydraulic cylinders and a power unit for independent operation.

During operation, the grab bucket closes its shells around the material, lifts and transports the load, then opens at the discharge point to release the material. The crane provides lifting and travelling movement, while the grab bucket performs the grabbing and unloading process.

Overhead crane grab buckets are commonly used for indoor material handling in factories and storage areas. Gantry crane grab buckets are widely used for outdoor applications such as ports, terminals, and bulk material yards. The suitable grab type depends on the material characteristics, crane configuration, and working conditions.

For more information, read the article: Qu'est-ce qu'un godet de grue à benne preneuse ?

Types of Grab Buckets for Overhead Crane and Gantry Crane

Different grab bucket designs are used for overhead cranes and gantry cranes based on material type, crane configuration, and operating requirements. The main types include mechanical clamshell grab buckets, hydraulic grab buckets, and hydraulic orange peel grabs.

Mechanical Clamshell Grab Bucket

A mechanical clamshell grab bucket is a rope-operated crane attachment that uses the crane’s wire rope system to open and close the bucket shells. It is available in two-rope and four-rope designs and is widely used for continuous bulk material handling due to its simple structure and easy maintenance.

Caractéristiques :

• Wire rope operated
• Two-rope or four-rope design
• Simple mechanical structure
• Low maintenance requirements

Applications :

• Coal handling
• Sand and gravel transfer
• Grain loading
• Ore handling

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Hydraulic Grab Bucket

A hydraulic grab bucket is a crane attachment driven by hydraulic cylinders and a dedicated power system. It provides adjustable gripping force and independent control, making it suitable for heavy materials and applications requiring flexible operation.

Caractéristiques :

• Hydraulic cylinder-driven
• Adjustable gripping force
• Flexible opening and closing control
• Suitable for heavy-duty handling

Applications :

• Scrap steel handling
• Rock handling
• Heavy bulk materials
• Industrial material transfer

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Godet hydraulique à écorce d'orange

A hydraulic orange peel grab bucket uses multiple curved tines to grip irregular materials. The multi-tine structure provides strong holding performance for materials that are difficult to handle with standard clamshell grabs.

Caractéristiques :

• Multiple tine design
• Strong grabbing ability
• Suitable for irregular materials
• Good control for loose and scattered loads

Applications :

• Scrap metal handling
• Steel plants
• Recycling facilities
• Waste material handling

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For details on the different applications and classifications of grab buckets, see: Différents types de godets preneuses pour grues et comment choisir le bon

How to Choose a Grab Bucket for an Overhead Crane?

Choosing the right grab bucket for an pont roulant requires matching the grab design with the material, crane capacity, bucket size, and operating conditions. A suitable grab bucket improves handling efficiency and keeps the crane system working within its rated load.

1. Identify the Material Type

Material properties are the first consideration when selecting a grab bucket. Different materials require different grabbing structures and closing forces.

Recommended grab types:

Mechanical clamshell grabs are commonly used for loose and flowable materials. Hydraulic grabs are better suited for heavy, irregular, or difficult-to-grab materials.

2. Match the Crane Capacity

The grab bucket must be compatible with the overhead crane lifting system. An oversized grab can increase the crane load and affect operating safety.

Include:

• Crane lifting capacity
• Grab bucket weight
• Material density
• Working load

The total lifted weight includes the grab bucket and the loaded material. The crane capacity should cover both during operation.

3. Select Suitable Grab Bucket Capacity

Grab bucket capacity should be selected according to material density, handling volume, and crane safe working load (SWL).

Capacity ranges:

• Mechanical clamshell grab: 0.5–30 m³
• Hydraulic grab: 2.5–16 m³

A high-capacity grab is not always the best choice. The bucket size must match the material weight and crane lifting capability.

4. Consider Working Frequency

Operating frequency affects the choice of grab structure. Different handling cycles require different levels of durability and control.

For continuous bulk handling, mechanical grabs are commonly used because of their simple structure and stable operation. For frequent loading cycles involving different materials, hydraulic grabs provide more flexible control and stronger adaptability.

The right grab bucket selection depends on material characteristics, crane capacity, bucket size, and operating requirements. A suitable configuration improves handling efficiency and provides reliable performance for long-term crane operation.

You can also read this article for more in-depth information: Grab Buckets for EOT Overhead Cranes

How to Choose a Grab Bucket for a Gantry Crane?

Choosing the right grab bucket for a portique requires considering the material type, crane specifications, working environment, and handling requirements. Gantry cranes are commonly used in ports, terminals, yards, and outdoor bulk handling areas, where grab buckets must match the crane capacity and operating conditions.

1. Consider the Material and Application

The material type determines the suitable grab bucket design. Different materials require different grabbing force and bucket structures.

Common applications:

Mechanical grabs are suitable for loose bulk materials with stable flow characteristics. Hydraulic and orange peel grabs are used for heavy, irregular, or difficult materials.

2. Match the Gantry Crane Specifications

The grab bucket must fit the gantry crane’s lifting system and operating parameters.

Factors include:

• Crane lifting capacity
• Grab bucket weight
• Rope system or hydraulic configuration
• Working load
• Lifting height and operating range

The combined weight of the grab and loaded material must remain within the crane’s rated capacity.

3. Select the Correct Grab Capacity

Grab capacity should match material density, handling volume, and crane load capacity.

Capacity ranges:

• Mechanical clamshell grab: 0.5–30 m³
• Hydraulic grab: 2.5–16 m³

Large-capacity grabs are commonly used in ports and bulk terminals, while smaller capacities are suitable for factories and storage yards.

4. Consider Outdoor Working Conditions

Gantry cranes are often installed in open environments where equipment faces dust, moisture, impact, and weather exposure.

Considerations include:

• Wear-resistant materials
• Corrosion protection
• Structural strength
• Continuous operation capability

Port terminals, mining yards, and bulk storage areas often require reinforced grab structures for long service life.

5. Evaluate Working Frequency

The operating cycle affects grab selection. Continuous bulk loading and unloading usually require durable and reliable grab designs.

• Mechanical grabs: Suitable for high-volume handling of coal, ore, and other bulk materials.
• Hydraulic grabs: Suitable for operations requiring stronger gripping force and flexible material handling.

Choose the grab type based on daily operating cycles, material changes, and handling requirements.

Selecting a grab bucket for a gantry crane requires matching the grab type, capacity, and structure with the crane specifications and handling conditions.

Mechanical vs Hydraulic Grab Bucket for Crane: Which One Should You Choose?

The material is the first factor when selecting a grab bucket. Mechanical grabs use wire ropes, while hydraulic grabs use hydraulic cylinders. Mechanical grabs have a simple structure and lower cost, while hydraulic grabs provide stronger gripping force and better control.

• Mechanical grabs use rope systems to open and close the shells. They are widely used for coal, ore, sand, gravel, and grain handling with overhead cranes, gantry cranes, and port cranes.
• Hydraulic grabs use hydraulic cylinders for stronger and more flexible operation. They are suitable for scrap steel, rocks, wet soil, and other heavy or irregular materials.

Choose mechanical grabs for bulk materials and continuous handling. Choose hydraulic grabs for heavy materials and applications requiring stronger control.

Hydraulic grabs are widely used in port material handling. For details on materials and how to select the appropriate equipment, please refer to the article: “Electro Hydraulic Grab Bucket for Port Bulk Material Handling.”

Common Applications of Crane Grab Buckets

Grab buckets are used for different material handling tasks based on material properties and working conditions. Mechanical grabs are mainly used for loose bulk materials, while hydraulic grabs handle heavy, irregular, and difficult materials.

Mechanical Clamshell Grab Bucket Applications

Ports

Used for loading and unloading coal, ore, and other bulk cargo.

Coal Terminals

Handles continuous coal transfer with high operating efficiency.

Grain Terminals

Suitable for loading and transferring grain and other free-flowing materials.

Sand and Gravel Yards

Used for moving sand, gravel, and construction materials.

Mining Operations

Handles bulk ores and minerals in mining facilities.

centrales électriques

Used for coal and fuel material handling systems.

Hydraulic Grab Bucket Applications

Scrap Yards

Used for grabbing irregular scrap steel and metal waste.

Steel Plants

Handles steel scrap, blocks, and heavy production materials.

Waste Treatment Plants

Suitable for mixed waste with different shapes and sizes.

Recycling Facilities

Used for sorting and transferring recyclable materials.

Quarries

Handle rocks, stones, and heavy mineral materials.

Dredging Operations

Used for underwater excavation and material removal.

Why Choose WEIHUA Crane Grab Buckets?

• ·  Customized Solutions
  Grab buckets designed according to crane type, material characteristics, and working conditions.
• ·  Wide Product Range
  Mechanical clamshell grabs, hydraulic grabs, and orange peel grabs for different applications.
• ·  Reliable Structure
  Durable materials and reinforced designs for heavy-duty material handling.
• ·  Professional Engineering Support
  Technical assistance from design selection to project implementation.
• ·  Global Project Experience
  Solutions supplied for ports, steel plants, mines, and bulk handling industries.
• ·  Complete Service Support
  Export support, installation guidance, and after-sales service.
• · International Standard Manufacturing
  Grab buckets comply with FEM, DIN, ISO, and other applicable standards for lifting equipment, supporting safe operation and quality requirements in global projects.

Conclusion

Choosing the right grab bucket for overhead cranes and gantry cranes requires matching the grab design with material characteristics, crane capacity, and working conditions. The suitable grab type improves handling efficiency and supports stable crane operation in different industries.

WEIHUA supplies customized mechanical clamshell grab buckets, hydraulic grab buckets, and orange peel grabs for overhead cranes, gantry cranes, and bulk material handling systems. Contactez-nous for grab bucket solutions based on your crane type and application requirements.

FAQ

Table des matières

Introduction

Crane grab buckets are available in different designs based on the drive system and material handling requirements. Mechanical grabs, hydraulic clamshell grabs, and hydraulic orange peel grabs are commonly used for handling coal, ore, sand, grain, scrap steel, and other bulk or irregular materials.

This article explains the main types of crane grab buckets, their structural differences, applications, and selection factors. It helps you compare different grab designs and choose a suitable solution for your crane system and handling conditions.

Types of Crane Grab Buckets

Crane grab buckets are mainly classified by drive system and grab structure. Mechanical grabs, hydraulic clamshell grabs, and hydraulic orange peel grabs are commonly used for different material handling conditions.

Mechanical Grab Bucket

Mechanical grab buckets are operated by crane wire ropes with two-rope or four-rope configurations. They use the crane lifting system to open and close the grab without an independent hydraulic power unit. The simple structure suits continuous bulk material handling.

• Capacity: 0.5–30 m³
• Rope Type: Two-rope / Four-rope
• Drive System: Wire rope operated
• Material: Q355B, NM400 wear-resistant steel

Common Materials: Coal, ore, sand, gravel, grain, fertilizer

Mechanical grabs are commonly used for bulk material handling where simple operation and reliable performance are required.

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Hydraulic Clamshell Grab Bucket

Hydraulic clamshell grab buckets use hydraulic cylinders to control the opening and closing of two shells. The hydraulic system provides direct shell movement and can be configured for crane-mounted or excavator-mounted applications.

• Capacité : 0,5–20 m³
• Structure: Two-shell clamshell design
• Working Pressure: 160–180 bar
• Drive System: Hydraulic cylinder

Common Materials: Coal, ore, sand, grain, fertilizer, mineral materials

Hydraulic clamshell grabs provide direct shell control for applications requiring flexible operation.

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Godet hydraulique à écorce d'orange

Hydraulic orange peel grab buckets use multiple hydraulic-driven tines to grip irregular and bulky materials. The multi-tine structure provides better material containment for loads that are difficult to handle with standard clamshell grabs.

• Capacity: 0.3–20 m³
• Tine Configuration: 4–8 tines
• Working Pressure: 180–260 bar
• Drive System: Hydraulic cylinder

Common Materials: Scrap steel, metal scrap, rock, waste, slag

Orange peel grabs are designed for irregular and bulky materials that require multi-directional gripping.

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Crane Grab Bucket Types Comparison

Crane grab buckets differ mainly in drive system, structure, and suitable materials. The following comparison shows the key differences between common grab types.

Mechanical grabs are suitable for standard bulk handling, hydraulic clamshell grabs provide flexible shell control, and hydraulic orange peel grabs are designed for irregular materials requiring stronger gripping.

Clamshell Grab vs Orange Peel Grab

Clamshell grabs and orange peel grabs differ mainly in structure and material handling applications. The right choice depends on the material shape, density, and handling requirements.

Clamshell Grab

• Structure: Two-shell design that closes like a bucket.
• Materials: Coal, ore, sand, gravel, grain, and other loose bulk materials.
• Applications: Ports, power plants, mines, and bulk material terminals.

Orange Peel Grab

• Structure: Multiple tines that close around the load from different directions.
• Materials: Scrap steel, metal scrap, rock, waste, and other irregular materials.
• Applications: Steel mills, recycling yards, and heavy material handling sites.

Clamshell grabs are suitable for loose and free-flowing materials, while orange peel grabs are designed for irregular loads that require stronger gripping.

Applications

The application of each grab type depends on the material characteristics and handling conditions. Clamshell grabs are mainly used for loose bulk materials, while orange peel grabs are selected for irregular and bulky loads.

Clamshell Grab

Commonly used in ports, coal terminals, mines, and bulk material handling sites for loading and unloading loose materials.

Orange Peel Grab

Commonly used in steel plants, recycling yards, and scrap handling facilities for irregular and bulky loads.

Choose clamshell grabs for loose bulk materials and orange peel grabs for irregular or bulky materials.

Mechanical vs Hydraulic Grab Bucket

Mechanical and hydraulic grabs differ mainly in the power source and operating method. Mechanical grabs use the crane rope system to control the grab movement, while hydraulic grabs use cylinders to control the shells or tines directly.

Mechanical grabs suit standard bulk material handling where a simple structure and reliable operation are required. Hydraulic grabs provide direct control of shells or tines for applications involving irregular materials or flexible handling needs.

Mechanical and hydraulic grab buckets differ significantly in their applications and configurations. For more details, see the article: Mechanical Clamshell Grab Bucket vs. Hydraulic Grab Bucket: What Is the Difference?

Hydraulic grabs are widely used in port material handling. For details on materials and how to select the appropriate equipment, please refer to the article: “Electro Hydraulic Grab Bucket for Port Bulk Material Handling.”

Applications of Different Crane Grab Buckets

Crane grab buckets are selected based on material characteristics, handling conditions, and crane systems. Each grab type is used in different industries based on its structure and operating method.

Mechanical Grab Applications

Hydraulic Clamshell Grab Applications

Hydraulic Orange Peel Grab Applications

Orange peel grab buckets are widely used in various industries and are particularly suitable for handling irregularly shaped metal. Steel is one of the most common materials handled; for specific applications, read the article: Hydraulic Orange Peel Grab Bucket for Scrap

The suitable grab type depends on the material shape, density, required capacity, and crane working conditions.

How to Choose the Right Crane Grab Bucket?

Choosing the right Crane Grab Bucket depends on the material, crane specifications, and working conditions. The key factors include material type, grab capacity, crane lifting capacity, drive system, and operating environment.

1. Choose the Grab Type According to Material

Material characteristics determine the grab structure.

• Clamshell grabs are suitable for loose bulk materials such as coal, ore, sand, gravel, and grain.
• Orange peel grabs are designed for irregular and bulky materials such as scrap steel, rock, and waste.

Special grab designs, including single-rope and underwater grabs, are used for specific applications such as dredging and slag handling.

2. Check Material Density and Size

Material density, particle size, and abrasiveness affect grab selection. Heavy materials such as ore and scrap steel require stronger structures and wear-resistant materials such as NM400 or NM500 steel.

Large or abrasive materials may require reinforced shells, tines, and cutting edges to improve service life.

3. Match Grab Capacity with Crane Lifting Capacity

Grab capacity must match the crane SWL and material weight.

Check:

• Grab volume
• Grab dead weight
• Crane SWL
• Load per cycle

A larger grab volume does not always mean a higher lifting capacity because material density directly affects the actual load.

4. Select the Suitable Drive System

• Mechanical Grab Bucket: Uses the crane rope system for opening and closing. It is suitable for continuous bulk material handling with a simple structure and low maintenance requirements.
• Hydraulic Grab Bucket: Uses hydraulic cylinders to control shells or tines directly. It is suitable for applications requiring stronger gripping control and flexible operation.

5. Consider Working Conditions

Operating frequency, environment, and material wear affect the final grab configuration.

• Crane type
• Hook connection
• Working height
• Material conditions
• Required opening size

The right Crane Grab Bucket is selected according to the material, crane capacity, and working conditions. Capacity alone is not enough to determine the suitable grab design.

If you are considering using an overhead crane or gantry crane and are unsure how to select the appropriate grab bucket, see the article: How to Choose a Grab Bucket for Overhead Cranes and Gantry Cranes?

Custom Crane Grab Bucket

Crane grab buckets can be customized according to material characteristics, crane specifications, and working conditions. Different structures and configurations are available for bulk material handling, scrap handling, and special applications.

• Grab Capacity
  Selected according to material volume, density, and required load per cycle.
• Grab Weight
  Matched with crane lifting capacity and working conditions.
• Shell or Tine Configuration
  Designed according to material shape and gripping requirements.
• Opening Size
  Adjusted for material size and loading conditions.
• Rope System or Hydraulic System
  Configured according to crane type and operating requirements.
• Material and Wear-Resistant Components
  Selected based on material abrasiveness and service conditions.
• Crane Connection
  Designed to match the crane hook, lifting system, and installation requirements.
• Environnement de travail
  Considered for ports, mines, steel plants, and other operating conditions.

WEIHUA provides customized crane grab bucket solutions for different lifting equipment and material handling applications.

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Conclusion

Crane grab buckets are available in different designs for various material handling conditions. Mechanical grabs, hydraulic clamshell grabs, and hydraulic orange peel grabs each have different structures, drive systems, and application areas. The right choice depends on the material type, crane capacity, grab configuration, and working environment.

WEIHUA manufactures and supplies crane grab buckets for ports, mines, steel plants, power plants, and other industrial applications. With experience in customized grab design, export projects, quality certification, and after-sales service, WEIHUA can provide suitable grab configurations for different cranes and materials. Contactez-nous with your requirements for a customized crane grab bucket solution.

FAQ

Table des matières

Introduction

A Crane Grab Bucket is a lifting attachment suspended from a crane hook for scooping, holding, and discharging bulk materials. It is operated by mechanical ropes or a hydraulic system, depending on the grab design, and is used with overhead cranes, gantry cranes, port cranes, and other compatible lifting equipment.

In this guide, we cover how a Crane Grab Bucket works, its main types, common materials and applications, key specifications, lifting capacity, and selection factors. We also compare different grab configurations to help match the bucket with the material and crane system.

Qu'est-ce qu'un godet de grue à benne preneuse ?

A crane grab bucket is a crane-mounted lifting attachment that replaces the hook to grab, lift, and discharge loose or irregular bulk materials. It is also known as a crane grab, clamshell bucket, orange peel grab, or electro-hydraulic grab, depending on the tine configuration and drive type. It can be used with ponts roulants, ponts roulants, port cranes, and other suitable lifting equipment. It is widely used in ports, wharves, freight yards, mines, power plants, and warehouses for handling coal, sand, gravel, ore, scrap steel, and logs.

Structurally, the grab consists of an upper frame, a set of tines or clamshell petals, and an opening-closing mechanism. The mechanism is driven by wire ropes, an electric motor, or hydraulic cylinders. Mechanical four-rope grabs use two support ropes and two closure ropes, while hydraulic units actuate each tine directly through cylinders mounted between the upper frame and the tine. Typical capacities range from 0.3 m³ for small excavator-mounted units to 20 m³ for large port cranes.

Selection depends on three factors: the material to be handled, the task to be performed, and the host equipment. The grab suits only bulk materials in their natural state; underwater or special materials require a customized design. Matching the grab’s self-weight and rated load to the crane’s remaining lifting capacity is the critical check, since a grab that is too heavy leaves no margin for the material itself.

For more information, read the article: Qu'est-ce qu'un godet de grue à benne preneuse ?

How Does a Crane Grab Bucket Work?

A crane grab bucket works by opening its shells or tines, lowering them onto the material, closing them under load, and then lifting and releasing the load at the discharge point. The entire cycle is driven by either wire ropes or hydraulic cylinders, depending on the grab type.

Types of Crane Grab Buckets

Crane Grab Buckets are commonly grouped into mechanical grab buckets, hydraulic clamshell grab buckets, and hydraulic orange peel grab buckets. The main differences are the drive system, grab structure, and material handling requirements.

Mechanical Grab Bucket

A mechanical grab bucket uses wire ropes connected to the crane lifting mechanism to open and close the grab. Two-rope and four-rope designs are common. It is used for coal, ore, sand, gravel, and other loose bulk materials.

Grab Capacity: 0.5–20 m³

Rope Type: 2-Rope / 4-Rope

Shell Type: Clamshell

Material: Q345 / Q355 / NM400

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Hydraulic Clamshell Grab Bucket

A hydraulic clamshell grab bucket uses hydraulic cylinders to control two or more shells. It is used for coal, ore, sand, gravel, grain, and other loose bulk materials. Crane-mounted and excavator-mounted configurations are available.

Grab Capacity: 0.4–16 m³

Working Pressure: 160–180 bar

Shell Type: Clamshell / Multi-Shell

Rotation: 360° / Non-Rotating

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Godet hydraulique à écorce d'orange

A hydraulic orange peel grab bucket uses hydraulic cylinders to operate multiple tines. The tines close around irregular loads such as scrap steel, metal scrap, rock, and bulky materials. It is widely used in steel plants, recycling yards, ports, and mines.

Grab Capacity: 0.6–10 m³

Working Pressure: 180–320 bar

Tine Configuration: 4–6 Tines

Rotation: 360° / Non-Rotating

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The selection of a Crane Grab Bucket is based on material type, grab capacity, lifting equipment, and working conditions.

Clamshell Grab vs Orange Peel Grab

Clamshell Grab and Orange Peel Grab are two common grab structures for crane material handling. Their main difference is the number and shape of the shells or tines, which determines the materials and working conditions each grab suits.

Clamshell Grabs are suited to loose materials that form stable piles and fill the bucket easily. Orange Peel Grabs are better for irregular, oversized, or heavy materials that need multi-directional gripping. For mixed material handling, an Orange Peel Grab offers broader gripping capability, while a Clamshell Grab provides higher filling efficiency for standard bulk materials.

Mechanical and hydraulic grab buckets differ significantly in their applications and configurations. For more details, see the article: Mechanical Clamshell Grab Bucket vs. Hydraulic Grab Bucket: What Is the Difference?

Orange peel grab buckets are widely used in various industries and are particularly suitable for handling irregularly shaped metal. Steel is one of the most common materials handled; for specific applications, read the article: Hydraulic Orange Peel Grab Bucket for Scrap

What Materials Can a Crane Grab Bucket Handle?

Crane Grab Buckets handle loose bulk materials, dense materials, and irregular loads. The suitable grab type depends on material density, size, shape, and handling conditions.

• Coal: Used in power plants, coal yards, and ports for bulk coal handling.
• Ore: Used in mines, ports, and steel plants for heavy material loading and unloading.
• Sand and Gravel: Used in quarries, construction sites, aggregate plants, and dredging operations.
• Grain: Used in grain terminals, storage facilities, and bulk carrier unloading.
• Scrap Steel and Scrap Metal: Used in steel mills, recycling yards and ports. Orange peel grabs suit irregular metal pieces.
• Rock and Stone: Used in quarries, mines and earthwork operations. Heavy-duty grabs are suited to abrasive materials.
• Fertilizer and Mineral Materials: Used in fertilizer plants, mineral processing facilities, and bulk material warehouses.
• Waste and Biomass: Includes municipal waste, slag, wood chips, and other lightweight or irregular materials.

Where Are Crane Grab Buckets Used?

Crane Grab Buckets are used in industries that require repeated loading, unloading, and transferring of bulk or irregular materials. Common applications include ports, mines, power plants, steel mills, and recycling facilities.

The grab structure should match the application requirements. Mechanical grabs are common for bulk material handling, while hydraulic clamshell and orange peel grabs are selected for specific material shapes and operating conditions.

For details on the different applications and classifications of grab buckets, see: Différents types de godets preneuses pour grues et comment choisir le bon

Crane Grab Bucket Specifications

Grab capacity should match the material density and crane lifting capacity. Shell or tine configuration depends on material size and shape, while the drive system and connection must match the crane or carrier equipment.

How to Choose a Crane Grab Bucket?

Selecting a Crane Grab Bucket depends on the material, crane capacity, and working conditions. The grab structure and operating system should match the actual handling requirements.

Material Type — Check the material density, size, shape, and abrasiveness. Clamshell grabs suit loose bulk materials, while orange peel grabs suit scrap steel, rock, and irregular loads.

Grab Capacity — Choose the grab volume based on the required load per cycle and material density. The grab weight must stay within the crane’s rated lifting capacity.

Crane Compatibility — Match the grab with the crane type, lifting capacity, hook connection, and working height.

Drive System — Mechanical grabs use rope operation. Hydraulic grabs use cylinders to control the shells or tines directly.

Working Conditions — Consider handling frequency, material wear, and site environment when selecting the grab structure and material.

The correct grab bucket is selected according to the material and crane requirements.

If you are considering using an overhead crane or gantry crane and are unsure how to select the appropriate grab bucket, see the article: How to Choose a Grab Bucket for Overhead Cranes and Gantry Cranes?

How Much Can a Crane Grab Bucket Lift?

A Crane Grab Bucket does not have a fixed lifting capacity. The actual load depends on the crane SWL, grab weight, bucket volume, and material density. A larger grab volume does not always mean a heavier lifting load.

For standard crane grab buckets, the capacity is commonly around 0.5–20 m³, with lifting loads matched to different crane requirements. Some heavy-duty configurations can be customized for higher-capacity applications.

The total lifted weight includes both the grab itself and the handled material. For example, a grab used for coal and a grab with the same volume used for ore may carry different material weights because of different bulk densities.

When selecting a Crane Grab Bucket, check:

• Crane SWL: Maximum allowable lifting load
• Grab Weight: Dead weight of the attachment
• Bucket Capacity: Volume per cycle
• Material Density: Weight of the handled material

The correct grab size is selected by matching the material and crane capacity rather than choosing the largest bucket volume.

Mechanical vs Hydraulic Crane Grab Buckets

Mechanical and hydraulic grab buckets differ mainly in the drive system. Mechanical grabs use crane ropes or mechanical linkage, while hydraulic grabs use cylinders to control the shells or tines.

Mechanical grabs are suitable for loose bulk materials and continuous handling operations. Hydraulic grabs provide direct control of shells or tines for irregular and heavy materials.

Crane Grab Bucket Maintenance

Regular inspection helps maintain stable grab operation and extends service life. Maintenance focuses on the drive system, moving parts, and wear components.

• Ropes or Hydraulic Lines: Check for wear, damage, and leakage.
• Hinge Pins and Bearings: Inspect lubrication, clearance, and wear condition.
• Shells, Tines and Wear Plates: Check for deformation, cracks, and excessive wear.
• Teeth and Cutting Edges: Inspect wear condition and replace when required.
• Hydraulic System: Monitor oil condition, pressure, and cylinder performance on hydraulic grabs.
• Worn Parts: Replace components according to material conditions and operating frequency.

Conclusion

A Crane Grab Bucket is selected according to the material type, crane system, and working conditions. This article explains how grab buckets work, the main types, common applications, key specifications, and the differences between mechanical and hydraulic designs to help identify the right solution for bulk and irregular material handling.

WEIHUA manufactures and supplies mechanical grabs, hydraulic clamshell grabs, and hydraulic orange peel grabs for ports, mines, steel plants, power plants, and other material handling applications. With customized design, overseas supply experience, and CE et ISO9001 certifications, we can provide grab bucket solutions, technical support, and after-sales service based on different crane systems and operating requirements. Contactez-nous with your material type, capacity requirements, and crane specifications for a suitable grab bucket configuration.

FAQ

Table des matières

Introduction

A Container Handling Gantry Crane is designed for lifting, stacking, and transferring containers in ports, terminals, railway yards, and logistics centers. Different crane configurations, such as RTG cranes, RMG cranes, and customized container gantry cranes, are selected according to site conditions, handling capacity, and operation requirements.

In this article, I will explain how to choose the right container handling gantry crane from key factors including crane type, lifting capacity, span, stacking height, travel system, automation level, and working environment. These points help users understand equipment requirements and select a suitable crane solution for their container handling operations.

What Is a Container Handling Gantry Crane?

A Container Handling Gantry Crane is used for container lifting, stacking, and transfer operations in ports, terminals, and logistics yards. The crane adopts a gantry structure with a trolley hoisting system and a dedicated spreader, which locks onto container corner castings for loading and unloading.

Unlike general cranes using hooks or slings, container gantry cranes use dedicated spreaders for faster container operations. Modern cranes can achieve 30+ moves per hour and support twin-lift operations. The structure is designed for continuous heavy-duty work, typically rated A6–A8 under FEM ou ISO standards.

Container handling gantry cranes are mainly classified by travel system and application. RTG cranes use rubber tires for flexible yard operation, RMG cranes run on fixed rails with positioning accuracy up to ±10 mm, and STS cranes are used for ship loading and unloading with outreach exceeding 70 m. Selection depends on handling requirements, yard layout, and automation needs.

Apprenez-en davantage sur les types de grues à conteneurs, leurs applications et leurs principes de fonctionnement dans notre guide : Qu'est-ce qu'une grue à conteneurs ? Types, utilisations et fonctionnement.

Types de portiques de manutention de conteneurs

Container handling cranes are mainly classified according to their working location and handling purpose. The common types include Ship-to-Shore (STS) cranes, Rubber Tyred Gantry (RTG) cranes, Rail Mounted Gantry (RMG) cranes, and customized container gantry cranes.

Different types of container handling gantry cranes are designed for different operating conditions. STS cranes handle ship-to-shore operations, RTG and RMG cranes focus on yard handling, and customized gantry cranes are configured for specific project requirements.

Découvrez les principaux types de grues à conteneurs (STS, RTG, RMG et portiques) et leurs applications dans diverses opérations de manutention : Types de grues à conteneurs : Explication des grues STS, RTG, RMG et portiques.

Container Handling Gantry Crane Specifications Guide

The key specifications of a container handling gantry crane include lifting capacity, dimensions, operating speed, crane structure, and safety systems. These parameters should match the working environment and handling requirements.

Container handling gantry crane specifications should match the application area, such as ports, railway yards, or inland container depots. High-frequency port operations usually require a higher working class, larger capacity, and advanced control systems, while smaller yards can select configurations based on actual handling volume.

Factors to Consider When Choosing a Container Handling Gantry Crane

Choosing a container handling gantry crane requires matching the crane type and specifications with the operating environment, container volume, and handling requirements. The main selection factors include application area, crane type, technical parameters, automation needs, and long-term operating costs.

1. Confirm the Application Area

The working environment determines the crane design and operating requirements.

Port Terminals

• Require high-duty cranes for continuous container loading and unloading.
• Focus on reliability, capacity, and corrosion protection.

Railway Freight Yards

• Require accurate container transfer between trains and storage areas.
• Focus on stable operation and efficient loading cycles.

Inland Container Depots

• Require flexible and cost-effective handling solutions.
• Focus on equipment utilization and maintenance costs.

2. Select the Right Crane Type

The main choice for container yards is between RTG and RMG cranes.

• RTG cranes are suitable for yards requiring flexible movement and lower infrastructure investment.
• RMG cranes are suitable for fixed layouts with high efficiency and automation requirements.

3. Check Technical Specifications

The main parameters should match container weight, storage layout, and working frequency.

Les caractéristiques des grues à conteneurs (capacité de levage, portée et hauteur de levage) influent directement sur le rythme des opérations. Pour des données détaillées, voir : Spécifications des grues à conteneurs : capacité, portée, hauteur de levage et classe de travail

4. Consider Efficiency and Safety Features

Modern container gantry cranes improve operational efficiency through advanced control systems.

Anti-Sway System: Reduces container swinging and improves positioning speed.

Épandeur de conteneur :

• Locks container corner castings for safe handling.
• Supports 20ft, 40ft, and twin-lift operations.

Safety System: Includes overload protection, limit switches, emergency stop, and monitoring systems.

Container crane operations require coordination across multiple stages. Learn how to operate safely during these operations: Comment fonctionnent les grues à conteneurs ? Explication du processus de manutention des conteneurs

5. Evaluate Long-Term Operating Costs

The total cost includes purchase, energy consumption, maintenance, and service.

Selecting a container handling gantry crane requires balancing working conditions, lifting requirements, automation level, and operating costs. The right crane configuration improves container handling efficiency and supports stable terminal operation.

RTG vs RMG: Which Container Gantry Crane Is Better?

RTG (Rubber Tyred Gantry Crane) and RMG (Rail Mounted Gantry Crane) are the two main container yard cranes. RTG focuses on flexible operation, while RMG focuses on high efficiency, automation, and stable operation.

How to Choose Between RTG and RMG?

RTG and RMG cranes have different advantages. RTG provides flexibility and lower initial cost, while RMG offers higher efficiency and automation capability. The selection should be based on yard layout, handling volume, automation requirements, and operating costs.

For more comparisons and distinctions regarding container cranes, please refer to the following articles:

• Grue RTG vs grue RMG : principales différences, coût et laquelle est la meilleure pour les parcs à conteneurs ?
• STS Crane vs RTG Crane vs RMG Crane : Principales différences expliquées
• Types of Container Cranes: STS, RTG, RMG & Gantry Cranes Explained

Common Mistakes When Selecting a Container Handling Gantry Crane

Choosing a container handling gantry crane requires matching the crane type and specifications with actual operating conditions. Many selection mistakes come from focusing only on initial requirements while ignoring long-term operation, maintenance, and future expansion.

The main mistake in selecting a container handling gantry crane is treating it as a simple equipment purchase. The right choice requires evaluation of operating conditions, handling requirements, long-term costs, and future development plans. A detailed site assessment and technical solution from the crane manufacturer can help avoid improper selection.

Conclusion

Container handling gantry crane selection depends on working conditions, container capacity, yard layout, automation requirements, and long-term operating costs. The right crane configuration helps improve handling efficiency and reduce operation costs.

With years of manufacturing and export experience, WEIHUA provides customized container handling gantry crane solutions, including crane design, technical support, installation guidance, and after-sales service. Contactez-nous to discuss your project requirements and get a suitable crane solution.

FAQ

Table des matières

Introduction

Container crane specifications directly affect lifting performance, operating efficiency, and equipment selection for ports, terminals, and container yards. Parameters such as lifting capacity, span, lifting height, and working class determine whether a crane can meet daily container handling requirements and long-term operation needs. Understanding these specifications helps buyers select the right container crane for different applications.

In this guide, I will explain the main container crane specifications, including capacity ranges, span requirements, lifting height options, and crane working classes. I will also compare specifications of RTG, RMG, and STS cranes, and discuss how factors such as container size, terminal layout, and operation frequency influence crane selection.

Spécifications des grues à conteneurs

Container crane specifications mainly include lifting capacity, span, lifting height, working class, trolley travel speed, crane travel speed, and container handling type.

The final container crane configuration depends on terminal layout, vessel size, container throughput, and operating requirements. The following sections explain key specifications in detail, including lifting capacity, working range, and spreader options.

Container Crane Span Specifications

Container crane span determines the working width of the crane, including the number of container rows and vehicle lanes it can cover. Span selection should match the yard layout, container arrangement, traffic lanes, and foundation conditions.

Typical Span Range by Crane Type

Container Gantry Crane

Usually 20–40 m, used for container yards and transfer areas.

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Grue RTG

Commonly 10.5–32.5 m, used span for standard container yards.

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Grue RMG

Typically 20–40 m, suitable for large container yards and railway terminals.

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Double Girder Gantry Crane

Around 2.5–37.5 m, used for warehouses and indoor or semi-indoor handling applications.

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Heavy Duty Gantry Crane

Usually above 40 m, designed for special heavy-load applications.

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Span Selection Based on Yard Layout

The required crane span is mainly determined by container stacking rows and traffic lanes:

Plage d'étendue	Container Yard Coverage	Application
20–25 m	Covers approximately 6–8 container rows with one traffic lane.	Small and medium container yards.
25–30 m	Covers around 8–10 container rows with one or two traffic lanes.	Medium-sized container terminals.
30–40 m	Covers more than 10 container rows with multiple traffic lanes.	Large ports and railway container yards.

Span Selection Factors

• Yard Layout: Span should cover the planned container rows, vehicle lanes, and required safety clearances.
• Future Expansion: Allow sufficient space for planned yard expansion to avoid major structural modifications.
• Foundation Load: Larger spans can increase wheel loads and rail foundation requirements, especially for RMG cranes.
• Crane Structure: Double-girder designs provide higher rigidity for large-span and heavy-load applications.
• Working Class: Span, load, and operating frequency should be considered together when determining the crane duty class.

Selection Tip: Container crane span should be calculated from the actual yard plan rather than selected from a standard range. Container rows, traffic lanes, rail layout, and foundation conditions should all be included in the design.

Container Crane Specification Comparison by Application

Container crane specifications vary with the application. STS cranes are designed for ship loading and unloading, while RMG and RTG cranes are mainly used in container yards and railway terminals. Capacity, span, lifting height, and working class are selected according to the operating site and handling requirements.

STS cranes are used for ship-to-shore handling, RMG cranes for fixed high-density yards and railway terminals, and RTG cranes for flexible container yard operations. Final specifications are determined by the container weight, yard layout, stacking height, vessel size, and operating frequency.

Factors Affecting Container Crane Specification Selection

Container crane specification selection depends on operating conditions, load requirements, site layout, efficiency targets, and operating costs.

Operating Conditions

• Application: STS cranes handle ship loading and unloading; RMG and RTG cranes serve container yards and transfer areas.
• Operation Frequency: Frequent continuous operation requires a higher working class, such as A7–A8.
• Container Type: The ratio of 20ft, 40ft, and 45ft containers affects spreader type and lifting capacity.

Load Requirements

• Maximum Working Load: Capacity must cover the container load, spreader, and lifting accessories.
• Load Spectrum: Frequent loads near rated capacity require a higher duty classification.
• Future Capacity: Reserve capacity for planned throughput growth without excessive oversizing.

Site and Layout

• Yard Layout: Container rows, traffic lanes, and safety clearances determine crane span.
• Foundation: RMG cranes require rail foundations; larger spans increase foundation requirements.
• Environment: Wind, salt spray, temperature, and corrosion conditions affect materials and crane design.

Operating Requirements

• Cycle Time: Hoisting speed, trolley speed, and anti-sway control affect handling time.
• Automation: RMG cranes are suitable for automated yards and integration with positioning and control systems.
• Energy: Power supply and local emission requirements affect the choice of electric, hybrid, or battery-powered systems.

Cost and Compliance

• Lifecycle Cost: Purchase price, energy use, maintenance, spare parts, and downtime all affect total operating cost.
• Standards: The crane should meet the required ISO, FEM, GB, OSHA, or ASME standards for the target market.
• Manufacturer Capability: Crane design experience and customization capability affect the final equipment specification.

Container crane specifications should match the actual load, operating frequency, site layout, environmental conditions, and future handling requirements.

Différents types de grues à conteneurs sont utilisés selon les scénarios opérationnels. Pour savoir comment choisir la grue adaptée aux opérations de manutention de conteneurs, consultez l'article : “ “Comment choisir un portique de manutention de conteneurs ?”

Conclusion

Container crane selection depends on lifting capacity, span, lifting height, working class, yard layout, and operating conditions. The right specifications should match the actual container weight, stacking requirements, handling frequency, and site conditions.

WEIHUA has years of crane manufacturing and export experience, with container cranes supplied to overseas ports, terminals, railway yards, and industrial sites. We provide crane design, manufacturing, installation guidance, commissioning, spare parts, and after-sales support. Contactez-nous with your crane requirements and site information. Our team will help you select suitable container crane specifications based on your operation needs.

FAQ

Table des matières

Introduction

Container cranes are specialized lifting equipment used for container loading, unloading, stacking, and transfer operations in ports, terminals, and logistics yards. Different types of container cranes are designed for specific working conditions, including Ship-to-Shore (STS) cranes for vessel handling, RTG cranes and RMG cranes for yard operations, and gantry cranes for customized container movement.

In this article, I will introduce the main types of container cranes, their working areas, key specifications, and application differences. I will also compare STS, RTG, RMG, and gantry cranes to explain how each crane type works and how to choose the right container handling equipment for different terminal requirements.

Types de grues à conteneurs

Different types of container cranes are designed for various container handling operations in ports, terminals, and logistics yards. The main types include STS cranes, RTG cranes, RMG cranes, and container gantry cranes, each with different structures, movement methods, lifting capacities, and application areas.

Ship-to-Shore (STS) Container Crane

Ship-to-Shore (STS) Crane is a quay-side container crane installed at the port berth for loading and unloading containers between vessels and shore transport equipment. It uses a long boom and spreader system to reach containers across the ship deck.

Paramètre	Gamme
Capacité de levage	30–100+ tons
Sensibilisation	40–70+ m
Hauteur de levage	30–50 m
Classe ouvrière	A6–A8

Avantages

• High-speed container loading and unloading
• Suitable for large container ships over 24,000 TEU
• Supports single, twin-lift, and multi-container handling

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Rubber Tyred Gantry (RTG) Crane

Rubber Tyred Gantry (RTG) Crane is a mobile container yard crane running on rubber tires. It is mainly used for container stacking and transfer operations in storage yards without fixed rails.

Paramètre	Gamme
Capacité de levage	30–50 tons
Hauteur d'empilement	4–8 containers
Span	20–30 m
Classe ouvrière	A6–A8

Avantages

• Flexible movement between storage blocks
• No rail installation required
• Supports 20ft, 40ft, and 45ft container handling

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Rail Mounted Gantry (RMG) Crane

Rail Mounted Gantry (RMG) Crane is a rail-based container handling crane used in fixed operating areas. It runs along parallel rails and is widely used in automated terminals, railway yards, and intermodal transport centers.

Paramètre	Gamme
Capacité de levage	30–80 tons
Span	30–50 m
Hauteur d'empilement	5–10 containers
Précision du positionnement	±10 mm

Avantages

• High positioning accuracy
• Suitable for automated operation
• Stable performance in continuous handling

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Container Gantry Crane

Container Gantry Crane is a general term for gantry-type cranes designed for container lifting and transfer. The crane can be configured with rubber tires or rail systems according to site conditions and handling requirements.

Paramètre	Gamme
Capacité de levage	20–100 tons
Span	Personnalisé
Boom Type	No boom / Single boom / Double boom
Mode de fonctionnement	Manuel / Télécommandé / Automatique

Avantages

• Flexible structure configuration
• Suitable for different container handling layouts
• Supports customized lifting height and span design

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STS, RTG, RMG, and Container Gantry Cranes are designed for different container handling operations. STS cranes focus on ship-to-shore transfer, RTG and RMG cranes handle yard operations, while Container Gantry Cranes provide flexible solutions for various container handling sites.

Apprenez-en davantage sur les types de grues à conteneurs, leurs applications et leurs principes de fonctionnement dans notre guide : Qu'est-ce qu'une grue à conteneurs ? Types, utilisations et fonctionnement.

Les opérations de grue à conteneurs nécessitent une coordination à plusieurs étapes. Pour comprendre leur fonctionnement et leurs principes d'exploitation, consultez : Comment fonctionnent les grues à conteneurs ? Explication du processus de manutention des conteneurs

STS vs RTG vs RMG Crane: Key Differences

Different types of container cranes, including STS, RTG, and RMG cranes, are widely used in ports and terminals for different handling operations. STS cranes handle ship-to-shore container transfer, while RTG and RMG cranes are mainly used for container stacking and yard transportation. The main differences between these crane types include application area, movement method, lifting capacity, and automation level.

Key Differences

• Working Function: STS cranes are used for ship-to-shore container transfer and directly affect vessel loading efficiency. RTG and RMG cranes handle container stacking and transfer inside yards.
• Movement Method: RTG cranes use rubber tires and can move between storage blocks without rails. RMG cranes run on fixed rails with higher positioning accuracy but limited working areas.
• Automation Capability: RMG cranes are widely used in automated terminals due to their rail guidance and electric drive systems. RTG cranes are commonly operated manually or remotely, while STS cranes support semi-automatic and remote operation.
• Cost and Operation: RTG cranes require less infrastructure investment but involve tire and fuel maintenance. RMG cranes need rail construction but offer lower energy consumption and stable long-term operation.

Different types of container cranes, including STS, RTG, and RMG cranes, serve different parts of the container handling process. STS cranes are mainly used for vessel loading and unloading, while RTG and RMG cranes are used for container yard stacking and transfer. The selection depends on terminal capacity, yard layout, automation requirements, and operating costs.

For a more detailed comparison of STS cranes and RTG cranes, see the article: STS Crane vs. RTG Crane: What Is the Difference?

Applications of Different Container Cranes

Different types of container cranes are used for specific handling tasks based on terminal layout, container flow, and operational requirements. STS cranes are mainly used for ship loading and unloading, while RTG and RMG cranes are commonly applied in container yards for stacking and transfer operations.

Ship-to-Shore (STS) Container Crane

STS cranes are used for ship-side container handling, transferring containers between vessels and shore transport equipment at port berths.

Seaport container terminals

Deep-water ports

Large container vessel loading and unloading

Rubber Tyred Gantry (RTG) Crane

RTG cranes are used for flexible container stacking and transfer operations in storage yards with frequent block changes.

Container storage yards

Inland container terminals

Logistics distribution centers

Rail Mounted Gantry (RMG) Crane

RMG cranes are used for fixed-area container handling where high positioning accuracy and automated operation are required.

Terminaux à conteneurs automatisés

Gares à conteneurs ferroviaires

Multimodal transport hubs

Container Gantry Crane

Container gantry cranes are used for customized container lifting and transfer operations with different span, height, and travel configurations.

Port container yards

Railway freight stations

Inland container depots

Why Are Different Types of Container Cranes Needed?

Different types of container cranes are designed for different handling stages, including ship loading and unloading, yard stacking, and container transfer. Each crane type has its own working area, operating requirements, and application scenarios.

• 1. Different Handling Functions: STS cranes handle ship-to-shore container transfer with long outreach and high lifting height. RTG and RMG cranes are used for container stacking and transfer in yards.
• 2. Mobility and Accuracy Requirements: RTG cranes use rubber tires for flexible movement between storage areas. RMG cranes run on fixed rails and provide positioning accuracy up to ±10 mm for automated operations.
• 3. Automation Requirements: RMG cranes are widely used in automated terminals, while RTG cranes are suitable for flexible yard operations. STS cranes support remote control and automation systems.
• 4. Vessel Size and Throughput: Large vessels over 24,000 TEU require STS cranes with more than 70 m outreach. Yard crane selection depends on storage capacity and container handling volume.
• 5. Investment and Operating Cost: RTG cranes have lower infrastructure costs but require tire and energy maintenance. RMG cranes require rail construction but provide stable operation and lower long-term energy consumption.

STS, RTG, and RMG cranes serve different roles in container terminals. The selection depends on handling process, automation level, site conditions, and operating costs.

How to Choose the Right Container Crane?

Different types of container cranes are selected based on terminal layout, container volume, vessel size, and operating requirements. The right crane type should match the handling process, including ship loading and unloading, yard stacking, and long-term operation needs.

1. Determine the Working Area

Choose the crane type according to the operation location.

• STS Crane: Used for ship-to-shore container loading and unloading.
• RTG Crane: Used for flexible container stacking in yards.
• RMG Crane: Used for fixed rail yards and automated terminals.

2. Check Lifting Capacity

Select lifting capacity based on container weight and handling method.

• Standard container cranes: 30–50 tons 
• Heavy-duty STS cranes: 60–100+ tons 
• Twin-lift operation requires higher capacity.

3. Match Vessel Size and Crane Dimensions

STS cranes require suitable outreach and lifting height for vessel size.

• Outreach: 40–70+ m 
• Lifting Height: 30–50 m 
• Suitable for large container vessels up to 24,000+ TEU 

4. Consider Yard Layout

RTG and RMG selection depends on storage area design.

• RTG: Suitable for yards requiring flexible movement.
• RMG: Suitable for fixed layouts with higher stacking density.

5. Evaluate Automation Requirements

Choose the control system based on operational needs.

• Manual operation
• Remote control
• Fully automated operation

RMG cranes are commonly used in automated container terminals due to their rail-based positioning.

6. Consider Operating Environment

Check factors such as wind, corrosion, temperature, and working hours. Coastal terminals usually require corrosion-resistant structures and reliable protection systems.

7. Compare Long-Term Operating Costs

Consider energy consumption, maintenance requirements, spare parts, and service support during the equipment life cycle.

Choosing the right container crane type requires matching the crane type, lifting capacity, operating area, and automation level to actual terminal requirements. The suitable crane configuration should fit the handling process, vessel size, yard layout, and long-term operation needs.

Les caractéristiques des grues à conteneurs (capacité de levage, portée et hauteur de levage) influent directement sur le rythme des opérations. Pour des données détaillées, voir : Spécifications des grues à conteneurs : capacité, portée, hauteur de levage et classe de travail

Différents types de grues à conteneurs sont utilisés selon les scénarios opérationnels. Pour savoir comment choisir la grue adaptée aux opérations de manutention de conteneurs, consultez l'article : “ “Comment choisir un portique de manutention de conteneurs ?”

Conclusion

Different types of container cranes are designed for specific handling tasks in ports, terminals, and logistics yards. STS cranes focus on ship-to-shore container transfer, while RTG and RMG cranes handle yard stacking and transfer operations. The right crane selection depends on container volume, vessel size, site layout, automation requirements, and operating costs.

WEIHUA provides container handling crane solutions, including STS cranes, RTG cranes, RMG cranes, and customized gantry cranes for different terminal applications. With experience in crane design, manufacturing, installation, and project support, WEIHUA develops container handling equipment based on terminal layout, operating conditions, and customer requirements. Contactez-nous to discuss your container crane project and find a suitable lifting solution for your operation.

FAQ

Table des matières

Introduction

Container cranes are used to lift, move, and position containers between ships, trucks, rail yards, and storage areas. The basic process relies on the spreader, hoisting system, trolley, and crane traveling mechanism, with each system handling a specific movement during container transfer.

How Do Container Cranes Work? This article explains how container cranes operate and how containers are moved from ships to yards through a step-by-step handling process. It covers the main crane components, lifting and horizontal movement systems, STS, RTG, and RMG crane operations, control systems, and the key factors affecting container handling efficiency.

Apprenez-en davantage sur les types de grues à conteneurs, leurs applications et leurs principes de fonctionnement dans notre guide : Qu'est-ce qu'une grue à conteneurs ? Types, utilisations et fonctionnement.

Pièces

Container cranes consist of structural, mechanical, electrical, control, and safety systems. These components work together to lift, move, position, and secure containers during handling operations.

Container Handling Process Step by Step

The container handling process involves lifting, moving, positioning, and storing containers between vessels, trucks, rail yards, and container yards.

• 1. Position the Crane: The container crane moves to the assigned working position and aligns the trolley and spreader with the target container.
• 2. Lower the Spreader: The hoisting system lowers the spreader onto the container. The spreader adjusts to the required container length.
• 3. Lock the Container: The spreader twist locks engage with the container corner castings and secure the load for lifting.
• 4. Lift the Container: The hoisting mechanism raises the container from the vessel, truck, chassis, or ground. Load monitoring and safety devices check the lifting operation.
• 5. Move the Container: The trolley moves the suspended container horizontally. For ship-to-shore operations, the trolley transfers the container between the vessel and quay side.
• 6. Position the Container: The crane slows down and positions the container above the target location. The anti-sway system helps control container movement during positioning.
• 7. Lower and Release: The hoisting system lowers the container onto the truck, AGV, rail wagon, or storage position. The twist locks release after the container is properly placed.
• 8. Return the Spreader: The spreader returns to the next pickup position, starting another handling cycle.

How Does a Container Crane Move a Container?

A container crane moves a container through three basic movements: hoisting, trolley travel, and crane travel. These movements control the vertical and horizontal position of the container during handling.

Hoisting — The hoisting mechanism raises and lowers the spreader and container. Motors, drums, and wire ropes control the vertical movement during lifting and lowering.

Trolley Travel — The trolley moves along the main girder and carries the spreader and container horizontally. This movement transfers the container between the vessel, quay, truck, or storage position.

Crane Travel — The entire crane moves along rails or tires to reach different working positions. In a container yard, crane travel allows the equipment to move between container rows and operating lanes.

Container movement is controlled by the combination of hoisting, trolley travel, and crane travel.

How Do RTG and RMG Cranes Handle Containers?

RTG and RMG cranes are widely used for container stacking and transfer in yards. Both use a spreader, hoisting mechanism, and trolley to handle containers, but their travel systems and operating areas are different.

RTG Container Handling

Un grue RTG runs on rubber tires and can move between different yard blocks. The trolley moves along the main girder while the hoisting system raises and lowers the container. This makes RTG cranes suitable for yards that require flexible equipment movement.

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RMG Container Handling

Un grue RMG runs on fixed rails and handles containers within a defined yard area. The trolley and hoisting system work together for container stacking and transfer. Rail-guided movement also makes RMG cranes suitable for automated and high-frequency yard operations.

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RTG vs RMG Container Handling

How Does an STS Container Crane Work?

How Does the Container Crane Control System Work?

The container crane control system coordinates the crane’s lifting, trolley travel, crane travel, and spreader operations. Its basic working process includes four steps:

Sensors Collect Data: Sensors monitor load, lifting height, trolley position, crane position, wind speed, and other operating conditions.

PLC Processes Signals: The PLC receives sensor signals and control commands, then calculates the required movement for each crane mechanism.

Drives Control the Mechanisms: Variable frequency drives control the motors for hoisting, trolley travel, and crane travel. The hydraulic system controls spreader functions such as locking and telescoping.

Monitoring and Safety Protection: The control system monitors crane status and works with overload protection, limit switches, anti-collision devices, and emergency stops.

For automated cranes, the control system can also integrate positioning, machine vision, and remote operation for container handling.

How Does Anti-Sway Control Work?

Anti-sway control limits container swing during lifting and trolley travel. It helps the crane keep the container stable when starting, stopping, and changing speed.

Mechanical Anti-Sway: Mechanical anti-sway uses guide structures or stabilizing devices to limit container movement. The structure provides physical restraint during crane operation.

Electronic Anti-Sway: Electronic anti-sway uses sensors and the control system to detect container movement. The drive system adjusts trolley speed and acceleration to reduce swing.

• Detect – Sensors detect trolley position, container movement, and swing angle.
• Calculate – The control system calculates the required speed and acceleration.
• Adjust – The drive system changes trolley movement to reduce container swing.

Anti-sway control reduces swing during crane acceleration and deceleration, helping the spreader reach the target position faster.

What Determines Container Crane Handling Efficiency?

Container crane handling efficiency mainly depends on crane speed, positioning accuracy, control performance, and yard or vessel operating conditions.

• Hoisting Speed – Higher hoisting speed shortens the time required to lift and lower containers.
• Trolley Speed – Trolley speed directly affects the horizontal transfer time between the vessel and quay.
• Crane Travel Speed – Higher travel speed reduces the time required to move the crane to another working position.
• Anti-Sway Performance – Good anti-sway control reduces container swing and allows faster positioning.
• Positioning Accuracy – Accurate spreader positioning reduces correction movements during pickup and placement.
• Control System – PLC, variable frequency drives, sensors, and automation systems coordinate crane movements and reduce operating delays.
• Operating Conditions – Wind, container arrangement, vessel movement, yard layout, and traffic around the crane can affect the handling cycle.

Handling efficiency is determined by the combined performance of crane speed, positioning, control, and operating conditions.

Container Crane Safety During Handling

Container crane safety depends on load control, position monitoring, travel limits, and protection against collisions and strong winds.

Safe container handling requires the crane, spreader, control system, and safety devices to work together throughout each lifting cycle.

How to Choose a Container Crane for Your Operation?

Container crane selection depends on the load, container dimensions, lifting range, working area, and operating frequency. Check the following factors before selecting the crane:

1. Container Weight
   Confirm the maximum container weight and select the rated lifting capacity accordingly.
2. Taille du conteneur
   Check the container lengths and types to select the suitable spreader configuration.
3. Required Lifting Height
   Determine the highest stacking position or required vessel lifting height and allow sufficient clearance.
4. Required Span or Outreach
   Measure the working width of the yard or the required vessel outreach to determine the crane span.
5. Handling Frequency
   Consider daily container moves, working hours, and cycle requirements when selecting the working class.
6. Yard or Port Layout
   Check rail spacing, container rows, traffic lanes, ground conditions, and available operating space.

The final crane configuration should be based on the actual working conditions. Key specifications include lifting capacity, span or outreach, lifting height, and working class.

Différents types de grues à conteneurs sont utilisés selon les scénarios opérationnels. Pour savoir comment choisir la grue adaptée aux opérations de manutention de conteneurs, consultez l'article : “ “Comment choisir un portique de manutention de conteneurs ?”

To select an STS container crane with the appropriate capacity, refer to the article: How To Choose The Right STS Crane For Your Port?

Les caractéristiques des grues à conteneurs (capacité de levage, portée et hauteur de levage) influent directement sur le rythme des opérations. Pour des données détaillées, voir : Spécifications des grues à conteneurs : capacité, portée, hauteur de levage et classe de travail

Conclusion

Container cranes use the hoisting mechanism, trolley, crane travel system, spreader, and control system to lift, move, and position containers. STS cranes handle ship-to-shore operations, while RTG and RMG cranes are mainly used for container stacking and transfer in yards. Crane selection depends on the container load, lifting height, span or outreach, handling frequency, and site layout.

WEIHUA provides container cranes for ports, container terminals, railway yards, and industrial applications. We provide crane design, manufacturing, installation guidance, commissioning, spare parts, and after-sales service. Contact us with your container handling requirements and site conditions for a suitable crane solution.

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