Inspection technology of hook

1. The hook used for the human-driven lifting crane is tested with 1.5 times the rated load as the inspection load;

2. The hook used for the power-driven lifting crane is tested with twice the rated load as the inspection load;

3. After removing the inspection load, the hook should not have any obvious defects and deformations, and the increase of the opening should not exceed 0.25% of the original size;

4. For the hooks that pass the inspection, the inspect marks should be printed in the low-stress area of the hook, including the rated lifting weight, factory standard or name, inspection mark, production number, etc.