What is a Port Gantry Crane?

A Port Gantry Crane is a heavy-duty lifting machine used in ports, container terminals, and cargo yards for container loading, unloading, stacking, and material handling. It is also known as a gantry crane or container gantry crane. It consists of a gantry frame, trolley, hoisting system, travel mechanism, and electrical control system. The crane moves through trolley travel and crane travel systems to complete cargo lifting and transfer operations in large working areas.

Port Gantry Cranes are mainly divided into Rubber Tyred Gantry Cranes (RTG) and Rail Mounted Gantry Cranes (RMG). RTG cranes use rubber tires for flexible movement and are widely used in container yards, with typical lifting capacities of 40–50 tons and stacking heights of 5–6 container layers. RMG cranes run on fixed rails and are suitable for high-efficiency container handling, with large models reaching a span of 30–40 meters and covering more than 10 container rows. The crane can be customized according to lifting capacity, span, working height, and site conditions.

أنواع

أجزاء

مواصفات

Port Gantry Cranes are designed for different port handling requirements. According to the traveling method, working area, and lifting tasks, they are mainly divided into RTG, RMG, Quayside Crane, and Hydraulic Gantry Crane.

رافعة جسرية بإطارات مطاطية (RTG)

رافعة جسرية بإطارات مطاطية (RTG) uses rubber tires for movement without fixed rails. It can move freely within the container yard and is suitable for operations requiring frequent position changes. RTG cranes are commonly powered by diesel generator sets or hybrid systems and are mainly used for container stacking and transfer.

Lifting capacity: 30–70t

Span: 10–35m

Lifting height: 15–30m

الطبقة العاملة: A6–A8

رافعة جسرية مثبتة على سكة حديدية (RMG)

رافعة جسرية مثبتة على سكة حديدية (RMG) runs on fixed rails and is driven by an electric system. It provides stable travel, accurate positioning, and is widely used in large container yards, railway terminals, and automated storage areas.

قدرة الرفع: 20-65 طن

18–40 مترًا

ارتفاع التكديس: 3–6 طبقات

ارتفاع الرفع: 8-20 مترًا

Quayside Container Crane (Ship to Shore Crane)

رافعة حاويات رصيف الميناء is installed at the front of container terminals for loading and unloading containers between ships and shore yards. The crane runs along quay rails and uses a container spreader and anti-sway system for ship handling operations.

قدرة الرفع: 5–80 طن

نصف قطر العمل: 15-45 مترًا

ارتفاع الرفع: 10–45 مترًا

الطبقة العاملة: A5–A7

Hydraulic Gantry Crane

Hydraulic Gantry Crane uses hydraulic systems to adjust the main beam height or leg position. It is suitable for sites with limited space or applications requiring frequent adjustment of lifting height and working dimensions. It is mainly used for heavy equipment handling in factories, warehouses, and special lifting projects.

Rated lifting capacity: 10t-1000t

Maximum lifting height: 4.5-12m

Weight: 5000kg

Span: 8-35m

أجزاء

A Port Gantry Crane consists of several key systems, including the gantry structure, hoisting system, trolley system, travel mechanism, spreader, and electrical control system. Each component works together to support container handling and heavy cargo lifting operations.

1. Rubber Tyred Gantry Crane (RTG)

Main Structure: The gantry frame consists of the main beam and supporting legs, which carry the crane load and support trolley movement.
Hoisting System: Includes the motor, drum, and wire rope system for lifting and lowering containers.
Trolley System: Moves horizontally along the main beam and carries the spreader for container positioning.
Travel System: Driven by rubber tires and motors, allowing the crane to move within the yard and perform 90° turning operations.
Spreader: Used for picking up and releasing containers, compatible with standard 20 ft and 40 ft containers.
Power System: Traditional RTG cranes use diesel generator sets, while newer models can use hybrid or electric power systems.
Electrical Control System: Uses PLC and frequency converters to control crane movements, speed regulation, and anti-sway functions.

2. Rail Mounted Gantry Crane (RMG)

Gantry Structure: The main beam and supporting legs form the steel frame, supporting the crane load and trolley operation.
Hoisting System: Consists of a motor, gearbox, drum, and wire rope for container lifting operations.
Trolley System: Runs along the beam rail and moves the spreader horizontally for container transfer.
Travel System: Uses steel wheels and drive motors to move along fixed ground rails.
Spreader: Designed for container handling and suitable for 20 ft and 40 ft standard containers.
Electrical System: Uses variable frequency control for accurate speed adjustment and positioning.
Operator Cabin: Usually moves with the trolley, allowing the operator to monitor container alignment during operation.

3. Quayside Container Crane (Ship to Shore Crane)

Steel Structure: Includes the front girder, rear girder, gantry system, and support rods, forming the bridge structure across the vessel working area.
Hoisting System: Uses motors, drums, and wire ropes to lift and lower containers during ship loading and unloading.
Trolley System: Moves along the main beam and carries the spreader between the ship and the dock.
Travel System: Runs on quay rails to move the crane along the terminal.
Boom Luffing System: Controls the front boom movement to avoid interference with the ship structure.
Spreader: Special container spreader for fast container handling, with some models equipped with anti-sway devices.
Electrical System: Uses a high-voltage power supply (2–24 kV) with variable frequency control for crane movement.

4. Hydraulic Gantry Crane

Gantry Structure: Uses a double main beam design with adjustable lifting points on each beam.
Hoisting System: Uses hydraulic cylinders for lifting operations instead of traditional wire rope drums.
Travel System: Equipped with polyurethane wheels and steering systems, allowing straight movement, lateral movement, and 0–90° turning.
Hydraulic Control System: Controls cylinder movement and steering actions to keep multiple lifting points synchronized.
Electrical Control System: Controls the hydraulic pump station and travel motors for coordinated operation.
Safety Devices: Includes limit switches, overload protection, and other safety components.

The combination of these components determines the crane’s lifting capacity, operating stability, and working efficiency. WEIHUA can customize component configurations according to lifting requirements and site conditions.

مواصفات

مُعامل	مواصفات
قدرة الرفع	5–200 tons
Max. Lifting Capacity	200+ tons (Heavy Duty Type)
ارتفاع الرفع	3–40 m
سرعة الرفع	3–8 m/min (Standard) / 35–50 m/min (Heavy Load)
سبان	3–50 m
الطبقة العاملة	A3–A8
Travel Type	Rubber Tire / Rail Mounted
سرعة السفر	0–20 m/min
Trolley Speed	120–150 m/min (Quayside Crane)
نوع الموزع	Single Container / Twin Container Spreader
حجم الحاوية	20 ft / 40 ft / 45 ft
مزود الطاقة	Diesel Generator / Cable Reel / Electric Power / Hybrid System
نظام التحكم	Cabin Control / Remote Control / PLC + Frequency Control
Positioning Accuracy	Up to ±5 mm (RMG Type)
Working Temperature	-40°C to +50°C
أجهزة السلامة	Overload Protection, Limit Switch, Anti-Collision Device, Wind Protection System

RTG Crane: Lifting capacity 40–50 tons, span 23.47 m, stacking height 15–18 m, suitable for container yard operations.
RMG Crane: Lifting capacity 20–50 tons, span 30–40 m, stacking height 21–24 m, suitable for rail-mounted container yards and automated storage areas.
Quayside Crane: Lifting capacity ≤40 tons, lifting speed 35–50 m/min, handling capacity 25–35 TEU/hour, used for ship loading and unloading.
Heavy Duty Gantry Crane: Lifting capacity to 200+ tons, suitable for shipyards and large component handling.

Specifications can be customized according to lifting capacity, working area, and application requirements.

مبدأ العمل

A Port Gantry Crane completes lifting and transfer operations through the coordinated movement of the hoisting system, trolley, and travel mechanism. Different crane types use tire or rail travel systems to meet specific port handling requirements.