Common faults and solutions of crane coupling

Crane couplings are used to connect the drive shafts of various crane mechanisms and transmit motion and torque. There are many types of couplings. According to whether they contain elastic elements, they are divided into two categories: rigidity and elasticity. Cranes generally use flexible couplings. The editor introduces the common faults and solutions of the crane coupling.

Possible failures of crane coupling

1. There are cracks in the coupling half

2. Wear of connecting bolts and pin holes

3. The gear teeth of the gear coupling are worn or broken

4. Keyway collapse and deformation

5. Wear of pins, pins, rubber rings, etc.

Possible consequences or cause of failure

1. The coupling is damaged

2. Shock and vibration, bolt shearing, lifting mechanism are prone to fall due to impact and vibration when braking

3. It is caused by lack of lubrication, heavy work, and reverse driving. Damaged coupling

4. The key is disconnected, and the torque cannot be transmitted

5. Strong shock and vibration are generated when braking

Solution

1. Replace

2. The lifting mechanism should be replaced with new parts, and the operating mechanism should be reamed after repair welding.

3. For the hoisting mechanism, the gear teeth should be replaced when the gear wear reaches 15% of the original thickness. For the operating mechanism, replace when the gear tooth wear reaches 30% of the original tooth thickness

4. The lifting mechanism should be replaced, and other mechanisms should be repaired and used

5. Replace worn parts

Safe use of coupling

Coupling is the intermediate connecting part of each motion mechanism. It has a direct impact on the normal operation of each motion mechanism. Therefore, you must pay attention to:

① The coupling is not allowed to have more than the specified shaft center line skew and radial displacement, so as not to affect its transmission performance.

②The bolts of the coupling must not be loose or damaged.

③Gear couplings and cross couplings should be lubricated regularly, and grease should be added once every 2 to 3 months to avoid severe wear of gear teeth and serious consequences.

④The contact length of the gear coupling tooth width shall not be less than 70%; the axial movement shall not be greater than 5mm.

⑤The coupling is not allowed to have cracks, if there is a crack, it needs to be replaced (it can be knocked with a small hammer, judged by the sound).

⑥The key of the coupling should be tightly matched and not loose.

⑦ The tooth thickness of the gear coupling is worn out. When the lifting mechanism exceeds 15% of the original tooth thickness, when the operating mechanism exceeds 25%, it should be scrapped. If there is a broken tooth, it should also be scrapped.

⑧If the elastic ring of the pin coupling and the sealing ring of the gear coupling are damaged and aging, please pay attention to timely replacement.

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