The core conditions for the scrapping of the hook

As the core load-bearing component of lifting machinery, the safety of the lifting hook directly affects the safety of personnel lives and equipment properties. According to standards such as "Safety Regulations for Lifting Machinery" and "Safety Regulations for Cranes", any violation of the standards requires immediate disuse and replacement.

‌Surface cracks‌: If any part of the lifting hook shows cracks or breaks, it must be immediately scrapped and repair by welding is prohibited.‌‌

‌Wear of dangerous sections‌: If the wear on the dangerous sections (such as the rope attachment point) reaches 10% of the original size, the load-bearing capacity will significantly decrease.‌‌

‌Deformation of opening degree‌: If the width of the hook opening increases by more than 15% of the original size, it indicates that the structure of the hook is unstable and there is a risk of disengagement.‌‌

‌Twist deformation‌: If the hook body twists by more than 10°, the force distribution becomes abnormal.‌‌

‌Plastic deformation‌: If irreversible deformation (such as bending) occurs on the dangerous sections or the neck of the hook, it indicates that the material has failed.‌‌

‌Replacement standards for matching components‌

The following situations require replacement of relevant components:

When the wear of the hook bushing reaches 50% of its original size;‌

When the wear of the lifting hook pin shaft exceeds 5% of its original size.‌

Judgment criteria and methods:

Use visual inspection to check for cracks; if necessary, use a 20x magnifying glass for auxiliary observation;‌

Measure the wear amount and the change in opening degree using a caliper;‌

Use an angle ruler or specialized measuring tools to detect torsional deformation.‌