Shackles play an important connecting role in lifting and hoisting operations, usually by connecting lifting ropes and hoisting targets through shackles. There are clear requirements before using the shackle, which is to check its current status to ensure that there are no problems before putting it into use. Once the shackle has these situations, it needs to be stopped immediately.

Firstly, the shackle has suffered from severe rusting and corrosion. If the degree of rusting at any position reaches one tenth of the diameter of the buckle body, it needs to be scrapped. This situation will lead to a serious decrease in the strength of the shackle, which no longer has the required load capacity. Forced use will face the danger of fracture at any time.

Secondly, there is visible deformation of the shackle, which may be caused by severe overload or severe external impact. However, either reason can lead to a decrease in the safety factor of the shackle, and any slight change can cause the transverse bolt to fail to lock smoothly.

Thirdly, there is damage to the threaded part of the disassembly screw hole, which has a serious impact on the disassembly. It can directly cause the horizontal bolt of the disassembly to be unable to lock and engage through the screw hole, which is equivalent to losing safety protection. The horizontal bolt may detach at any time, leading to a falling accident.

These are the three states in which the shackle needs to be stopped from use. Before using the shackle for lifting operations, it is necessary to conduct a comprehensive inspection to ensure the safety of the lifting operation.