Double Girder Gantry Crane With Cable Reel

Double Girder: Two horizontal beams (girders) run parallel across the span of the crane. This design offers greater lifting capacity and stability compared to single-girder models.

Gantry Design: The girders are supported by vertical legs on either side, forming a "gate-like" structure. These legs move on ground rails.

Cable Reel: A motorized or spring-driven drum that winds and unwinds the power and control cables, ensuring continuous power supply to the hoist or trolley.

 

Core Components：Engine, Bearing, Gearbox, Motor, Gear

Place of Origin：Henan, China

Warranty：2 years

Weight (KG)：50000 kg

Video outgoing-inspection：Provided

Machinery Test Report：Provided

Application：Outdoor

Keywords：Gantry Crane

Rated Loading Capacity：50Ton

Cross travelling speed：44.6m/min

Long travelling speed：47.1m/min

Control way：cabin

Power supply：Cable reel

Steel track：QU80

Power：3-phase AC 50HZ 380V

 

 

1.Main beam

1)Definition:
The main beams (also called girders) are the horizontal steel beams that span across the gantry frame. In a double girder design, there are two parallel main beams that support the crab/trolley and hoist system.
2)Function:
Carries the load of the hoist and trolley.

Transmits the load to the legs and wheels.

Serves as the track for the trolley movement (which houses the hoist).

Houses the power supply system, including cable reel tracks or support brackets.

2.Lifting System

Hoist:Mechanism that lifts/lowers the load-typically a wire rope hoist for double girder cranes.
Trolley/Crab:The movable frame that carries the hoist across the two main beams.
Motor + Gearbox:Drive the lifting drum (for up/down movement) and trolley travel (left/right across girders).
Drum & Wire Rope:The rope wraps around a drum and connects to the hook block.
Hook Block:Contains pulleys and hook for lifting the load.
Limit Switches:Prevent over-hoisting or over-lowering.

3.End carriage

Support Structure:Carries the weight of the entire bridge (girders, hoist, trolley, and load).
Movement:Allows the gantry crane to travel longitudinally along the ground rails.
Drive Mechanism:Houses motors and gearboxes that power crane movement.
Cable Management:Often integrates brackets or conduit to support the cable reel system that supplies power.

4.Crane travelling mechanism

The crane traveling mechanism of a Double Girder Gantry Crane with a cable reel is the system that enables the entire gantry crane to move longitudinally along the ground rails-carrying the load across a work area such as a yard, port, or factory.

This system is vital for positioning loads with precision, and it integrates with the cable reel to maintain continuous electrical power supply during movement.

5.Trolley travelling mechanism

The trolley traveling mechanism of a Double Girder Gantry Crane with a cable reel is the system that enables the trolley (crab)-which carries the hoisting unit-to move laterally across the two girders. This allows the crane to position the load across the width of the span, complementing the longitudinal movement of the whole gantry.

7.Crane Hook

The hook of a Double Girder Gantry Crane with a cable reel is the final load-handling device that directly connects to the load being lifted. It is attached to the hoisting mechanism and is a critical component in terms of safety, capacity, and functionality.

8.Motor

The motor of a Double Girder Gantry Crane with a cable reel is one of the most critical components, as it powers all major crane motions: hoisting, trolley travel, and crane travel. These motors must be precisely selected for power, torque, duty cycle, and control compatibility.

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9.Sound and light alarm system & limit switch

The Sound and Light Alarm System and Limit Switches are essential safety and operational control components of a Double Girder Gantry Crane with a cable reel. These systems ensure safe crane operation by providing visual/audible warnings and motion limits to prevent collisions, over-travel, or overload situations.
1)Sound and Light Alarm System
This system alerts nearby personnel when the crane is operating, moving, or encountering abnormal conditions.
2)Limit Switches
These devices prevent the crane from exceeding its operational limits. They're installed at the end of travel paths or on mechanical systems (e.g. hoisting drum) to stop or reverse motion when a preset limit is reached.

10.Safety Devices

1)Limit Switches
Up/Down Hoist Limit: Prevents hook from over-raising or over-lowering.

Trolley/Crane Travel Limit: Prevents motion beyond safe boundaries.

Dual-stage switches often used (slow down then stop).

2)Overload Limiter (Load Limiter)
Measures hoisting load using:

Load cell, strain gauge, or dynamometer pin.

Triggers hoist cut-off if load exceeds rated value (e.g., 110% of capacity).

Can integrate with digital display or PLC system.

3)Emergency Stop
Large red mushroom button(s) installed on:

Pendant control

Cabin desk

Electrical cabinet

Disconnects power supply to all motion drives instantly.

4)Sound & Light Alarm
Buzzer or siren + flashing light (usually red or amber).

Automatically activates during crane movement or alarm condition.

Warns personnel nearby.

5)Rail Clamps / Wheel Locks
Mechanical or hydraulic clamps mounted on end carriages.

Lock wheels when crane is parked.

Essential for outdoor gantry cranes exposed to wind loads.

11.Control Mode

1)Pendant Control
How it Works: The operator uses a pendant controller attached to a cable, or a wireless pendant for remote operation. The pendant has buttons, switches, or joysticks to control:

Hoisting (up/down)

Trolley Travel (left/right)

Crane Travel (longitudinal motion)

Advantages:

Easy for operators to control within a fixed range.

Cost-effective for smaller cranes.

Minimal training required.

Applications: Indoor, smaller to medium-duty cranes in factories and warehouses.

2)Cabin Control
How it Works: The operator is seated inside a crane cabin (typically with 360° visibility), controlling all functions using joysticks, buttons, or pedals.

Hoist, trolley, and crane travel are controlled manually by the operator.

Advantages:

Full control over all movements with a clear view of the working environment.

Ideal for heavy-duty, large cranes where precise control is essential.

Applications: Outdoor cranes, heavy lifting, ports, and construction sites.

3)Radio Remote Control
How it Works: The operator uses a wireless remote control to operate the crane from a distance. The remote typically features:

Buttons for hoisting, traveling, and other operations.

Joysticks for precise control.

Advantages:

Allows the operator to move around freely and be in the best position for crane operation.

Ideal for outdoor environments where the operator needs mobility.

Applications: Outdoor cranes, shipyards, construction sites, and situations requiring mobility.

12.Sketch

 

Main technical

 

 

1. High Load Capacity
Double girder design allows for a higher load capacity than single girder cranes, making it suitable for lifting heavy loads (up to 500 tons or more).

The cable reel system ensures a stable and uninterrupted power supply for hoisting even under heavy-duty conditions.

2. Efficient and Continuous Power Supply
The cable reel system provides continuous power transmission to the crane, even as it moves along its track.

Unlike traditional cranes that might require external power sources for each movement, the cable reel allows for seamless operation without the need for complex wiring or power interruptions.

3. Compact and Space-Saving
Cable reels reduce the need for long hanging cables or festoon systems, saving space and improving the crane's aesthetics.

The crane's track-based system allows it to utilize vertical space efficiently, which is particularly important in warehouse and factory settings where ceiling height is maximized.

4. Flexibility in Outdoor Applications
Double Girder Gantry Cranes with cable reels are ideal for outdoor use, such as in ports, construction sites, or steel mills.

The cable reel system is built to withstand weather conditions, ensuring reliable performance even in harsh environments.

The gantry structure itself allows for easy movement across wide spans, making it highly versatile for outdoor or large-area operations.

5. High Stability and Safety
The double girder design provides enhanced stability, especially during lifting operations, reducing sway or instability.

The cable reel ensures that there are no loose cables or wires on the ground, which can cause hazards. This reduces the risk of accidents and tripping hazards in the working area.

6. Reduced Maintenance
The cable reel system minimizes wear and tear on external wiring and cables.

Since the cable reel is enclosed or mounted on a drum, it prevents damage from external elements (dust, water, or mechanical strain).

It reduces the need for frequent repairs or cable replacements, which can otherwise be costly and time-consuming.

7. Increased Productivity
Cable reel systems enhance operational efficiency by ensuring continuous power without interruption.

The seamless power supply allows the crane to perform long and complex tasks without having to stop for power changes, leading to higher productivity during lifting, moving, or stacking operations.
 

 

1. Port and Shipping Industry
Applications:
Container Handling: Used for loading and unloading containers from ships at container terminals. The crane moves along the quay, handling containers of various sizes and weights.

Shipbuilding: Used in shipyards to lift and move large sections of ships or entire vessels during construction and maintenance.

Bulk Material Handling: The crane can be used to move bulk materials like coal, iron ore, or other goods across the dock area.

Why It's Ideal:
High lifting capacity and long reach.

Cable reel ensures continuous operation along long quay lengths.

2. Construction Sites
Applications:
Heavy Lifting of Construction Materials: Moving materials such as steel beams, pre-cast concrete, or large machinery around the construction site.

Lift and Place Operations: Particularly useful for lifting and placing large structural elements during the construction of bridges, high-rise buildings, and other large infrastructure projects.

Why It's Ideal:
Double girder design provides high stability for lifting heavy materials.

Outdoor applications where large spans are necessary.

Cable reel ensures the crane can travel long distances without losing power.

3. Steel and Metal Manufacturing Plants
Applications:
Steel Mill Operations: Lifting and transporting hot steel coils, billets, and slabs. The crane is often used to move material to and from furnaces, mills, or storage areas.

Handling Heavy Equipment: Moving heavy machinery or large metal pieces within the plant or between different areas.

Why It's Ideal:
High lifting capacity allows handling of extremely heavy materials.

Weather-resistant cable reel ensures reliability in tough, high-temperature environments.

Long travel distances support the movement of materials across large plant layouts.

4. Heavy Manufacturing and Assembly
Applications:
Assembly Line Support: Used to move large parts or subassemblies in industries such as aerospace, automotive, and industrial machinery manufacturing.

Precision Lifting: Ideal for lifting and placing heavy components in assembly operations where precision is critical.

Why It's Ideal:
Controlled movement due to cable reel power ensures precision in delicate operations.

High load capacity supports the lifting of large industrial parts or machines.

5. Mining Industry
Applications:
Handling Heavy Mining Equipment: Used for lifting and moving large mining machinery, equipment, or materials like coal, ore, or mineral rocks.

Storage Yard Operations: Moving large and heavy mining materials within stockpiles and storage areas.

Why It's Ideal:
Heavy-duty design makes it suitable for harsh environments.

Outdoor flexibility with the cable reel system ensures reliable power transmission across mining sites.

6. Power Plants
Applications:
Coal Handling: Used to lift and move coal into furnaces and other processing areas within thermal power plants.

Maintenance and Equipment Handling: Lifting and moving heavy machinery, such as turbines, generators, and transformers, during maintenance or upgrades.

Why It's Ideal:
Heavy-duty capacity needed to move large and heavy equipment.

Continuous power supply via cable reel supports long and continuous lifting operations.

 

1.Design and Engineering: Customized to the customer's specifications.

2.Material Procurement: Sourcing of steel, motors, electrical parts, etc.

3.Fabrication: Cutting, welding, and assembly of structural components.

4.Assembly: Assembling the crane frame, trolley, motors, and cable reel system.

5.Electrical and Hydraulic Systems: Wiring and control system installation.

6.Painting and Coating: Surface protection for outdoor use.

7.Testing and Inspection: Load testing, functional checks, and safety tests.

8.Final Assembly: Adjustments, calibration, and preparations for delivery.

9.Packaging and Delivery: Shipping the crane to the customer's site.

10.Commissioning and Training: On-site setup and operator training.

Workshop view:

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.