wire rope winch taboo chain hoist hook to use

Is a professional chain hoists, lever hoists, cranes and other lifting equipment line tackle manufacturers, the following are the details related news hook hoists used four taboo.  Chain hoists enough material with high strength hook, and made of high alloy steel liftech small electric hoist aterials, the fracture does not occur in use, a higher safety factor. However, the use of hook should note the following points:
1, chip hook does not allow splicing. 
2, hook surface and internal defects without affecting its usability.
3, prohibiting the use of cast hook, so casting internal defects difficult to find and eliminate.
4, prohibiting the use of manufactured or repaired weldment hook, so there may be cracks in steel welding.
Avoid stress points and liftech strong electric winch support points are too far away; parts subject to vibration loads to avoid friction force transmission; avoid considering only a single load transfer; should not affect the working parts are ignored when the deformation of the force distribution; under impact loading parts Avoid just too large; affected parts should avoid stress becomes too rough surface, as well as the residual tensile stress.