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Double girder gantry crane is a large and medium-sized crane with rail operation. It is generally used for loading, unloading, handling and grabbing of materials in open-air workplaces or warehouses. The general lifting capacity is 10-300t (or more), the span is generally 18-40m (or more), and the lifting height (height on the rail) can reach 10-30m (or more). Its working environment is within -20℃～+40℃. This product has two forms: ground control (small) and cab control.
The main steel structure components of MG double-girder gantry crane are composed of main beam, end beam, support beam, outrigger, lower cross beam, balance beam , trolley frame, etc. These components can be made of steel (truss type) or steel plate (box type). The trolley running mechanism consists of wheels, reducer, motor and brake. It is driven on both sides. The trolley running mechanism consists of wheels, reducer, motor and brake. It generally adopts a centralized drive lifting mechanism, and a special drum mechanism or winch can be used. Electric hoists can also be used for lifting. The total power supply form of the crane can be overhead soft or hard sliding line type, or cable drum type. Users can choose the various mechanism forms and speeds of the crane according to relevant specifications, and our factory can design and produce according to user needs.
The lower crossbeam of the gantry crane for outdoor use should generally be equipped with a track clamp. When the crane is not working, the track clamp should be tightened on the track. Other anchoring devices can also be used to fix the crane to prevent it from being blown away by the wind, causing the crane to derail or overturn.
All the mechanisms of the crane are operated in the control room, which contains controllers for various mechanisms. The large and small car running mechanisms have travel switches to limit their travel, and are equipped with buffers to prevent collisions at the end position. The lifting mechanism has a limit switch to control the rising height. When it is lifted to a certain height, the limit switch cuts off the rising power supply, and the mechanism also stops working, and can only run downward in the future.
|
Capacity |
Main Hook |
ton |
5 |
10 |
20 |
32 |
50 |
75 |
100 |
160 |
200 |
320 |
|
Aux Hook |
/ |
/ |
5 |
5 |
10 |
20 |
20 |
50 |
50 |
80 |
||
|
Span |
m |
18-35 |
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|
Lifting Height |
10/12 |
15 |
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|
Speed |
Main Hook |
m/min |
12.5 |
8.5 |
7.2 |
7.5 |
5.9 |
3.9 |
3.1 |
3.5 |
3.6 |
|
|
Aux Hook |
/ |
/ |
12.7 |
12.7 |
13.2 |
7.2 |
7.2 |
5.9 |
6 |
|||
|
Trolley Travelling |
37.2 |
43.8 |
36.6 |
37 |
38.5 |
38.4 |
33.9 |
22.5 |
29 |
16.7 |
||
|
Crane Travelling |
37.7 |
37.7 |
38/44 |
38 |
37.8/44 |
4.1-41 |
3.4-34 |
2.8-28 |
||||
|
Working Class |
A5 |
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|
Power Source |
380V/50Hz/3-phase (customizable) |
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Main Girders: The double girder design consists of two parallel horizontal beams, typically made from steel. These girders are the primary load-bearing elements of the crane, providing the strength and stability required to lift and transport heavy loads. The girders are connected by a cross beam, which enhances the overall structural integrity.
Legs (Supports): The girders are supported by two or more vertical legs that extend down to the ground. These legs are usually equipped with wheels, allowing the crane to move along a predefined path. The legs provide the necessary height for the crane to clear obstacles and handle materials at various levels.
Wheels and Rail System: The end carriages are the sections at the ends of the girders that house the wheels and drive mechanisms. These wheels run on rails or tracks, allowing the crane to move back and forth along its designated path. The wheels can be rubber-tired for outdoor or non-rail applications, or steel for running on rail tracks.
Drive Mechanism: The movement of the crane is powered by motors located in the end carriages. These motors drive the wheels and enable the crane to travel along its path, providing the horizontal motion needed to position the crane over the load.
Hoist: The hoist is the lifting mechanism that raises and lowers the load. In a double girder gantry crane, the hoist is typically mounted on a trolley that moves along the length of the girders. The hoist consists of a motor, drum, and wire rope or chain. The motor powers the drum, which winds the rope or chain to lift or lower the load.
Trolley: The trolley travels horizontally along the main girders, carrying the hoist and the load it is lifting. The trolley is equipped with wheels that run on rails mounted on the girders. The movement of the trolley allows the crane to position the hoist directly above the load, providing precise control over the lifting operation.
Operator Cabin: In larger gantry cranes, an operator cabin may be provided. This cabin is typically mounted on one of the girders or on a separate structure attached to the crane. From the cabin, the operator can control all aspects of the crane's operation, including movement, lifting, and safety systems.
Remote Control: Many modern double girder gantry cranes are equipped with wireless remote controls, allowing the operator to control the crane from a distance. This enhances safety and flexibility, as the operator can move to a safe vantage point while controlling the crane.
