The Structure and Transmission Principle of Double Girder Overhead Crane

2024-11-04 16:48:55

Double-beam Cranes, especially double-beam Bridge Cranes, are heavy-duty lifting equipment widely used in various industrial and engineering fields. The complexity of its structure and transmission principle ensures its efficient, safe and stable working performance.

1. Structure

Double-beam cranes are mainly composed of metal structure, mechanical part and electrical part.

Metal structure

Main beam: The core structural component of a double-beam crane, usually made of steel, capable of bearing heavy loads. The main beam is generally a box-type or I-shaped structure to improve strength and stability. The design of the main beam needs to consider its torsion, bending and shear resistance to ensure safety under various working conditions.

Secondary beam (cross beam): Connects the two main beams to keep the relative position of the main beams stable. The secondary beam is usually a lateral support structure used to enhance the overall rigidity of the bridge.

End beam: Located at both ends of the crane, it is used to support the main beam and connect the crane track. The end beam is equipped with walking wheels and drive devices to enable the crane to move along the track.

Mechanical part

Lifting mechanism: including motor, reducer, drum group, wire rope and pulley group. The motor drives the drum group to rotate through the reducer, and then drives the wire rope and pulley group to lift and lower the weight. The design of the lifting mechanism needs to consider parameters such as its lifting speed, lifting weight and lifting height.

Trolley running mechanism: It consists of motor, vertical reducer, driving wheel and walking wheel. The motor drives the driving wheel to rotate through the reducer, and then drives the trolley to move along the track on the main beam. The design of the trolley running mechanism needs to consider parameters such as its running speed, running distance and stability.

Trolley running mechanism: Similar to the trolley running mechanism, but used to drive the crane as a whole to move along the track. The design of the trolley running mechanism also needs to consider parameters such as its running speed, running distance and stability.

Electrical part

Electrical control system: including control cabinet, motor, frequency converter, sensor and cable. The electrical control system is used to control various operations of the crane, such as starting, stopping, speed adjustment and position control. The design of the electrical control system needs to consider its reliability, safety and ease of use.

Power supply system: Provide power supply for the crane, including main power supply, backup power supply and cable trolley, etc. The design of the power supply system needs to ensure the stable operation and safety of the crane.

2. Transmission principle

The transmission principle of the double-beam crane mainly involves the transmission of the lifting mechanism, trolley running mechanism and trolley running mechanism.

Transmission of lifting mechanism

Power source: electric motor.

Transmission path: electric motor → gear coupling → compensation shaft → brake wheel coupling → reducer high-speed shaft end → reducer low-speed shaft → drum group → wire rope and pulley group → hook.

Working principle: The motor generates power and transmits it to the high-speed shaft end of the reducer through the gear coupling, compensation shaft and brake wheel coupling. After the reducer reduces the high speed of the motor to the required speed, it outputs power to the drum group. The drum group drives the hook to lift and lower heavy objects through the wire rope and pulley group.

Transmission of trolley running mechanism

Power source: electric motor.

Transmission path: motor → brake wheel coupling → compensation shaft → half-tooth coupling → high-speed shaft end of vertical reducer → low-speed shaft of vertical reducer → drive wheel shaft → drive wheel.

Working principle: The motor generates power and transmits it to the high-speed shaft end of the vertical reducer through the brake wheel coupling, compensation shaft and half-tooth coupling. After the vertical reducer reduces the high speed of the motor to the required speed, it outputs power to the drive wheel shaft, thereby driving the trolley to move along the track on the main beam.

Transmission of the trolley running mechanism

Power source: motor.

Transmission path: motor → brake wheel coupling → compensation shaft → half-tooth coupling → high-speed shaft end of reducer → low-speed shaft of reducer → full-tooth coupling → trolley drive wheel shaft → trolley drive wheel.

Working principle: Similar to the transmission principle of the trolley running mechanism, but used to drive the crane as a whole to move along the track. The motor generates power and transmits it to the high-speed shaft end of the reducer through the transmission device. After the reducer reduces the high speed of the motor to the required speed, it outputs power to the trolley drive axle, thereby driving the crane to move along the track.



The structure and transmission principle of the double-beam crane are the basis for ensuring its efficient, safe and stable operation. In practical applications, it is necessary to select and configure according to the specific working environment and needs to achieve the best lifting effect.