Common Failure Types Of Workshop Cranes - Operating Mechanism

Common Failure Types Of Workshop Cranes - Operating Mechanism

 

The 30 ton bridge crane is a kind of crane that runs across the track above the factory building. Generally, a hook is used as a pick-up device. It is suitable for loading, unloading and lifting in the solid span of the workshop and warehouse of industrial and mining enterprises.

 

Its basic structure is composed of three parts: metal structure, transmission mechanism, safety and control system. Today we mainly come to understand the two major operating mechanisms: cart and trolley operating mechanisms

 

The running mechanism of the cart is driven separately. The two driving wheels have two sets of symmetrical and independent driving devices. The driving device is mainly composed of motors, brakes, reducers, wheels and other components. All mechanisms use rolling bearing mechanisms, and all components use gears. The coupling is connected, and the active and passive wheel axles are all supported on the angular bearing box for easy assembly and disassembly. The trolley frame is welded by steel plates, on which a lifting mechanism and a running mechanism are installed.

 

Trolley operating mechanism: The trolley operating mechanism is a vertical reducer driven by an electric motor. The low-speed shaft of the reducer is connected to the driving wheel in a centralized driving manner, and the other end of the motor shaft is equipped with a brake.

 

Fault phenomena and causes of the running mechanism of the cart and trolley

 

The running mechanism of the trolley often has faults of poor braking, and sometimes it cannot stop at a certain position; the fixing bolts of the reducer base are loose; the internal components of the reducer are damaged due to poor lubrication.

 

The faults of the crane’s operating mechanism are the severe shaking and vibration noise of the crane during the braking process; the loosening of the fixing bolts of the reducer and the damage of internal components; the damage of the buffer system of the running limit device.

 

 

Causes:

 

One is the running inertial force when starting or braking;

 

The second is that the driver operates in violation of regulations or misoperates, and suddenly reverses the operation when the crane is running in one direction, causing the motor to reverse and causing excessive impact torque;

 

The third is poor lubrication caused by insufficient lubricating oil of the reducer or other reasons;

 

Fourth, the adjustment of the left and right braking mechanisms of the cart operating mechanism is unbalanced, and the left and right braking torques are not equal during the braking process, resulting in side torsion and vibration.

 

 

Precaution

 

Always check the parallelism, levelness and cleanliness of the running track of the trolley, and pay attention to repairing the local damage and deformation of the track.

 

Maintain the levelness and cleanliness of the running track of the cart, and ensure the flatness error of the left and right tracks.

 

The fixing bolts of each reducer should be checked and tightened frequently.

 

Frequently check and adjust the brakes, especially the tightness of the two brake springs on the left and right of the cart and the clearance between the brake shoe and the brake wheel should be adjusted to be equal.

 

Always check the lubrication status of each reducer, try to use grease lubrication, choose a reducer with good torsion resistance and a large base diameter.