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What is the big hook and small hook switching of hook machine?
Operation error, equipment failure.

1. When changing the hook size, the operator did not operate the equipment correctly or did not follow the correct procedure. This will cause the equipment to be unable to switch the hook size smoothly, resulting in sudden lifting.

2. The hook machine itself is faulty or in poor condition, which affects the smoothness of hook switching. For example, the mechanical part is damaged and the hydraulic system is abnormal, which will lead to sudden rise or fall during switching.