the rolling direction of the steel sheet must be located, and the hook piece not joined

6, the longitudinal axis of plate hook sheet, the rolling direction of the steel sheet must be located, and the hook piece not joined.
7, plate hook countersunk head rivet sheet application, while on-board crane hook lifting objects with high stress point contact with the bent portion shall rivet connections.
8, the board allowed between laminations hook welded closed, allowing only intermittent welding.
9, overload test has been conducted on the hook should be discarded.
Edit this paragraph a safety inspection, human-powered lifting mechanism with hooks to 1.5 times the rated load as a proof load test.
2, the power-driven lifting mechanism with hooks to two times the rated load as a test load test.
3, after the load hook lifted electrics tacker, there should be no obvious defects and deformation of the opening degree of the increase in the amount of not more than 0.25% of the original size.
4, inspection hook, the Hand pallet jacks should be marking the low stress areas, including the nominal weight, factory standard or the trade name, inspection mark, production number and so on.
Edit this paragraph hook scrapped when one of the following conditions should be scrapped:
① crack;
② dangerous section wear up to 10% of the original size;
③ opening degree increased by 15% compared with the original size;
④ hook body torsion 超过 10 °;
⑤ hook dangerous section or plastically deformed hook neck;
⑥ hook thread corrosion;
⑦ piece hook bushing wear up to 50% of the original size, replace the bushing;
⑧ piece mandrel wear hook up to 5% of the original size, you should replace the mandrel.