Electric hoist hook requirements for accessories

Each year due to the  Wire rope hoist  hook breakage, loss and other accidents have occurred, resulting in damage to the hoist hook problems arise in addition to the material itself and the quality of maintenance is also a major factor in how to use the following detailed description of your hoist hook for accessories What are the requirements.
1, hook selection of steel, more durable.
2, hook surfaces should be smooth, without cracks, sharp, burr, delamination and other defects.
3, the hook may have cracks inside, white point, and affect its safe use of inclusions and other defects.
4, the dangerous section of the hook shank or may not have plastic deformation, not corrosion hook thread.
5, the electric  rope hoist  hook openings should be consistent with the provisions of GB10051 in 5.2.
6, electric hoist hook torsional deformation of the hook body torsion angle shall not exceed 10 degrees;
In daily use if you find hoist hook head is damaged, remember not welding. Electric hoist hook head is the result of heat-treated after forging made ​​of. Hot metal forging process is a method of processing technology, metal structure of the forging process is refined and fiber arrangement process, and in order to eliminate the internal stress treatment to improve mechanical properties.
The welding is only a partial melting of the metal, fusion, curing process of the whole process. Close to the welding of electric  lift hoist  hook maternal effects due to thermal conduction, so that part of the base metals are subject to different degrees of heating and cooling effect, so this part of the organization and the performance has changed, but the majority are for welding hook wear sunken part, and and dangerous section and the vertical recess in the same line. Makes welding metal hook and metal fiber structure refinement ordered destroyed, thereby reducing the performance of the entire electric hoist, prone to accidents.