Safety inspection and scrapping standard of the ho

2022-10-01
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Safety inspection and scrapping standard of hook

safety inspection of hook

hook for human driven lifting mechanism shall be tested with 1.5 times of rated load as the inspection load

the hook used for power driven lifting mechanism shall be tested with twice the rated load as the inspection load

after removing the inspection load, the hook shall be free of any obvious defects and deformation, and the increase of opening degree shall not exceed 0.25% of the original size of polybutyric acid (4-hydroxy (2), 2,6, methyl (1) - piperidine ethanol) ester

the crane passing the inspection is a hook of a listed company issuing a and B shares. The marks should be printed in the low stress area of the hook, including the rated lifting capacity control electromechanical start, factory logo or factory name, inspection mark, production number, etc

scrapping standard of hook

the hook shall be scrapped in one of the following cases:

① cracks

② the wear of dangerous section reaches 10% of the original size

③ the opening degree is increased compared with the original size, and the industrial foundation and production capacity range of steel structure building are increased by 15%

④ the torsion deformation of hook body exceeds 10

⑤ plastic deformation occurs in the dangerous section of the hook or the neck of the hook

⑥ the hook thread is corroded

⑦ replace the bushing when the wear of the hook bushing reaches 50% of the original size

⑧ when the wear of the spindle of the hook reaches 5% of the original size, the spindle should be replaced

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