According to the different manufacturing processes, the hooks of Europe type crane are divided into three types: slice hook, forged hook and cast hook. At present, the common hook is a forged single hook, and the cast hook is not allowed to be used in hoisting machinery. The hook is widely made of low carbon steel and carbon alloy steel to solve the problem of resistance and cracking.
In order to ensure the safety of Europe type crane, the hook should be inspected frequently. When one of the following conditions is found, it should be stopped immediately.
① Cracks appear;
② The wear of the dangerous section of the hook manufactured according to gbl0051.2 shall not be greater than 5% of the original height; The hook manufactured according to the industry standard shall be greater than 10% of the original size;
③ The opening degree is increased by 15% compared with the original;
④ Torsional deformation exceeds 10 degrees;
⑤ Plastic deformation of dangerous section or hook neck; When the wear of the plate hook bushing reaches 50% of the original size, the core sleeve shall be discarded;
6 When the wear of the plate hook mandrel reaches 5% of the original size, the mandrel shall be scrapped.
It is also important to note that the above defects of the hook shall not be welded.