Outdoor Rail Mounted Gantry Crane with Low Price

Specification:

Load Capacity: 30 - 60 ton
Lifting Height: 9 - 18m
Span: 20 - 40m
Working Duty: A6-A8

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Introduction

A Rail Mounted Gantry Crane (RMG) is a specialized heavy-duty crane designed for large-scale material handling. It is most commonly found in ports, container terminals, and rail yards, where efficiency and precision are critical. Unlike rubber-tired gantry cranes, RMG cranes run on fixed rails, offering superior stability and accuracy during operation.

An RMG is built with a rigid steel framework supported by two vertical legs that travel along rails embedded in the ground. Spanning the legs is a horizontal girder or bridge, on which the trolley moves back and forth. The trolley carries a hoist system and a container spreader, enabling the crane to lift and position containers of various sizes. Many RMG cranes can handle 20ft, 40ft, and even 45ft containers with ease.

The rail-mounted design allows the crane to move smoothly along a fixed track, covering large storage areas efficiently. The trolley travels horizontally on the girder, while the hoist lifts and lowers the container. Operators can control the crane manually, or in some modern facilities, automated systems are used to improve precision and reduce labor requirements.

Components

A rail mounted gantry crane (RMG) is a heavy-duty lifting machine designed primarily for container handling in ports, rail yards, and large industrial facilities. It operates on fixed rails, which ensures high stability and precision in moving heavy loads. The design and components of an RMG crane are built for continuous, high-intensity operations.

Girder or Bridge: The main horizontal beam, or girder, spans the working area and supports the trolley’s movement. For RMG cranes, this is typically a double-girder structure to handle heavier loads and wider spans, often reaching across multiple container rows.

Trolley: The trolley travels along the girder and carries the hoist. On an RMG, the trolley is designed for fast, smooth movement and precise positioning, crucial for stacking containers in tight spaces.

Hoist: The hoist is the lifting mechanism, often equipped with a spreader for gripping shipping containers. It can be a rope hoist with advanced control systems to minimize load sway and improve efficiency.

Supporting Legs: Two large vertical legs support the girder and are mounted on rails. These legs house the drive mechanisms and provide the structural stability required for lifting and transporting containers over long spans.

End Carriages and Wheels: At the base of each leg are the end carriages, which contain the wheels that run on rails. These ensure the crane’s smooth longitudinal movement across the working area.

Drives and Motors: Multiple drive systems power the trolley, hoist, and gantry movement. They are designed for high torque and durability, ensuring the crane can handle heavy loads continuously.

Control System: RMG cranes use advanced control systems, including cabin controls, wireless remote controls, and automation interfaces. Many modern units are semi-automated or fully automated for higher efficiency.

Power Supply System: Most RMG cranes use cable reel systems or busbars for continuous electrical supply, enabling uninterrupted operation.

Safety Systems: Overload limiters, anti-collision devices, wind sensors, and emergency stop functions ensure safe operation, even in challenging weather conditions.

By integrating these components, an RMG crane offers the precision, strength, and reliability needed for large-scale container handling and heavy-duty industrial applications.

Work Process of Rail Mounted Gantry Cranes

Step 1: Positioning

The work cycle of a Rail Mounted Gantry Crane (RMG) begins with accurate positioning. The crane is aligned along a set of parallel rails that define its operating area, often covering multiple container rows. These rails are installed on the ground or elevated structures to ensure smooth and stable movement. Proper positioning at the start is crucial for operational efficiency and safety.

Step 2: Powering On and System Check

Before operations commence, the crane operator powers on the RMG and conducts a thorough system check. This includes verifying electrical supply, hydraulic functions, hoisting mechanisms, and safety systems such as overload protection, limit switches, and emergency stop buttons. Ensuring all systems are operational prevents downtime and accidents.

Step 3: Traveling to the Pickup Point

Once the checks are complete, the crane travels along its rails toward the container pickup location. Movement can be controlled manually by an operator seated in a cabin high above the ground, or automatically via an advanced computer control system. The rail-mounted design guarantees stable travel, even when carrying heavy loads.

Step 4: Container Pickup

Upon arrival, the RMG positions itself precisely above the container. The spreader beam—capable of adjusting to different container sizes—lowers and locks onto the container’s corner castings. This secure attachment ensures that the load remains stable during lifting and transport.

Step 5: Lifting and Transporting

The hoisting system, typically driven by electric motors and wire ropes, lifts the container smoothly off the ground. With the load raised to the required clearance height, the crane then travels along the rails to the designated drop-off point, whether that’s a storage stack, railcar, or truck loading bay.

Step 6: Stacking or Placement

At the destination, the operator carefully lowers the container into its assigned position. Precision is critical here, especially when stacking containers several units high to optimize yard space. The spreader beam then disengages from the container.

Step 7: Returning and Repeating the Cycle

Once the container is placed, the crane either returns to its starting position or proceeds directly to the next container, depending on operational demands. This cycle repeats continuously, allowing the RMG to handle large volumes of containers efficiently throughout the day.