How to check the main mechanism and parts of the h

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How to check the main mechanism and parts of the crane

1. Check whether the reducer leaks oil. If there is abnormal noise in the box during operation, open the box cover for inspection. Generally, it is caused by bearing damage or excessive gear meshing backlash, serious tooth surface wear and other reasons

2. Check the performance and condition of the brake. Brake is an important part of crane, which directly affects the accuracy and reliability of the movement of each mechanism. Therefore, it is necessary to carefully check the condition of the brake of the lifting and luffing mechanisms, and observe the opening of the brake shoe and the wear of the friction element brake skin. For the belt brake, pay attention to check whether the steel backing of the brake belt has cracks, whether the transmission of the brake is flexible, whether the brake frame is intact and whether the elasticity of the main spring and auxiliary spring meet the requirements

3. Inspection of steel wire rope. Check the steel wire rope. "The person in charge of the market of a foreign-funded chemical enterprise at the scene told the author to observe the broken wire, wear, kink, rust and other conditions again. For some positions where the wear and broken wire are serious but have not exceeded the standard, the production limit of the steel plant in Hebei and the blast furnace inspection should be marked, so as to focus on tracking and re inspection. Pay attention to check whether the safety limiter of the steel wire rope in the drum is effective, whether the steel wire rope pressing plate on the drum is compressed and whether the number of pressing plates is appropriate

4. Inspection of pulley. The key points are whether the wear at the bottom of the groove exceeds the standard and whether the cast iron pulley has cracks. For the balance wheel of the pulley block of the luffing mechanism, it is easy to be ignored because it does not act under normal circumstances. Therefore, the flexibility of rotation must be checked before installation, otherwise, the length and tension of the left and right steel wire ropes can not be automatically adjusted through the balance wheel during installation, which increases the difficulty and danger of adjusting the rope at high altitude

5. Check whether each coupling is loose or even "rolling key". Focus on checking whether the elastic rubber ring of the elastic pin coupling has abnormal wear, and pay special attention to the low wear of the main paper types of the gear ring of the toothed coupling. Due to poor installation accuracy, when there is a large offset between the two shafts, the whole ring gear will soon wear out in a short time. In case of such situation in the lifting mechanism, serious accidents are easy to occur

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