Maintenance knowledge of small cantilever hook

Small jib crane hook maintenance knowledge
1. The surface of the hook should be smooth and clean, and there should be no flaws such as cracks, acute angles, burrs, peeling, etc .
2.There must be no cracks, white spots and inclusions that affect its safe use inside the hook.
3. Defects on crane accessories hooks are not allowed to be repaired.
4.Dangerous section wear must not exceed 10% of the original size.
5.The opening degree should meet the requirements of 5.2 in GB10051.
6. The torsional deformation of the crane accessory hook, that is, the twist angle of the hook body, must not exceed 10.
7.Dangerous section or hook of the hook must not be plastically deformed.
8. The thread of the hook must not be corroded. Small cantilever crane, balance crane, lifting freight elevator.
9. The electric hoist newly installed or installed after disassembly and inspection should first be run for empty cars several times. But before the end of the installation, do not try to turn on the power.
10. Before normal use, a static load test with a rated load of 125% and a lift of about 100 mm from the ground for 10 minutes should be performed to check whether it is normal.
11. Dynamic load test is based on rated load weight, repeated lifting and left-right movement test. After the test, check whether the mechanical transmission part, electrical part and connection part are normal and reliable.
12. In use, it is absolutely forbidden to use in the environment that is not allowed, and in excess of the rated load and the rated closing times per hour (120 times).
13. When installing, debugging and maintaining, you must strictly check whether the limit device is flexible and reliable. When the hook is raised to the upper limit position. The distance between the hook shell and the drum shell must be greater than 50mm (10t, 16t, 20t must be greater than 120mm).