Technical regulations for inspection of drums and pulleys of lifting machinery

　　1. The height of the edges on both sides of the reel should exceed the outer steel wire rope, and the value should not be less than twice the diameter of the steel wire rope;

　　2. The fixing device at the end of the steel wire rope on the reel should have anti-loose or self-tightening performance;

　　3. The pulley groove should be smooth and clean, without any defects that might damage the steel wire rope;

　　4. The pulley should be equipped with a device to prevent the steel wire rope from jumping out of the groove;

　　5. The drum and pulley should be scrapped when any of the following conditions occur:

　　1) Cracks or damaged wheel rims;

　　2) The wear on the drum wall reaches 10% of the original wall thickness;

　　3) The pulley groove has uneven wear of up to 3mm;

　　4) The wear on the pulley groove wall thickness reaches 20% of the original wall thickness;

　　5) The wear on the bottom of the pulley groove exceeds 25% of the corresponding wire rope diameter;

　　6) Other defects that can damage the steel wire rope.

　　Inspection regulations for the transmission system of lifting machinery

　　1. The clutch should engage smoothly, transmit power effectively, and disengage **;

　　2. The operation of each transmission component should be free from impact, vibration, heating, and oil leakage;

　　3. The gear meshing within the gearbox should be intact, with an appropriate amount of oil;

　　4. During operation, the gearbox should not produce abnormal noise, vibration, heat, or oil leakage;

　　5. The gearbox should be in the correct gear, and shifting should be smooth and effortless;

　　6. The coupling parts should not be damaged; the connection should not be loose, and there should be no loud impact sound during operation;

　　7. The steel wire ropes on the drum should be neatly arranged;

　　8. The anchor bolts of the gearbox and the connecting bolts of the housing should not be loose or damaged;

　　9. The reduction gearbox should operate without abnormal noise, and its temperature rise should comply with the specifications in the instruction manual.

　　Inspection cycle of lifting machinery The regular inspection cycle of in-service lifting machinery is as follows:

　　(1) Tower cranes, lifts, and mobile cranes: once a year;

　　(2) Light and small lifting equipment, bridge cranes, gantry cranes, portal cranes, cable cranes, derrick cranes, railway cranes, jib cranes, and mechanical parking equipment should be inspected once every 2 years, while cranes that lift molten and hot metals should be inspected once a year.

　　The rated load test, static load test, and dynamic load test items in the performance test must be conducted during the initial inspection and **regular inspections**. For the rated load test items, they shall be conducted once every subsequent inspection cycle.