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　　Observing the dangerous section of the semi-closed hook group can analyze its stress status, and you can have an in-depth understanding of the three dangerous sections.

　　Semi-closed hook group is subjected to shear stress on the I-I section of the hook, and the shear stress tends to cut off the hook; on the I-I section of the hook (this section is located at the position of the thread retracting groove of the tail thread of the hook), it is subjected to tensile stress, and the 5t-N of the hook is subjected to tensile stress; on the II section of the hook, it is subjected to tensile stress and the moment is applied to the force, so the inner side of the II section of the hook is subjected to tensile stress, while the semi-closed hook group model is subjected to tensile stress, =5t-N is affected by tensile stress. According to calculations, the inner tensile stress is more than twice as high as the outer compressive stress. Therefore, the hook body is made into a thick inner tilt II and a thin outer side.

　　The hooks of semi-closed hook groups must have a certificate of conformity when leaving the factory and must have a rated lifting weight mark in the low-stress area. The hook body inspection of the semi-enclosed hook group is generally cleaned with kerosene first, and then a 20x magnifying glass is used to observe whether the hook body has fatigue cracks, especially the inspection of dangerous sections must be carefully and carefully.

　　The retraction groove of the hook and column screw part of the semi-enclosed hook group is a stress concentration, and attention should be paid to check whether there are cracks. The fasteners such as casings, pins, small holes, earrings, etc. should also be checked for looseness or wear on the board hook. For hook bodies of some large heavy cranes, non-destructive testing is also used to check whether there are defects inside them.

　　The above are some introductions to the inspection methods of the semi-closed hook group. You can find out if you have any questions or needs. You can contact us directly, or leave your needs and contact information directly on the website, and we will contact you in time!

　　Observing the dangerous section of the semi-closed hook group can analyze its stress status, and you can have an in-depth understanding of the three dangerous sections.

　　Semi-closed hook group is subjected to shear stress on the I-I section of the hook, and the shear stress tends to cut off the hook; on the I-I section of the hook (this section is located at the position of the thread retracting groove of the tail thread of the hook), it is subjected to tensile stress, and the 5t-N of the hook is subjected to tensile stress; on the II section of the hook, it is subjected to tensile stress and the moment is applied to the force, so the inner side of the II section of the hook is subjected to tensile stress, while the semi-closed hook group model is subjected to tensile stress, =5t-N is affected by tensile stress. According to calculations, the inner tensile stress is more than twice as high as the outer compressive stress. Therefore, the hook body is made into a thick inner tilt II and a thin outer side.

　　The hooks of semi-closed hook groups must have a certificate of conformity when leaving the factory and must have a rated lifting weight mark in the low-stress area. The hook body inspection of the semi-enclosed hook group is generally cleaned with kerosene first, and then a 20x magnifying glass is used to observe whether the hook body has fatigue cracks, especially the inspection of dangerous sections must be carefully and carefully.

　　The retraction groove of the hook and column screw part of the semi-enclosed hook group is a stress concentration, and attention should be paid to check whether there are cracks. The fasteners such as casings, pins, small holes, earrings, etc. should also be checked for looseness or wear on the board hook. For hook bodies of some large heavy cranes, non-destructive testing is also used to check whether there are defects inside them.

　　The above are some introductions to the inspection methods of the semi-closed hook group. You can find out if you have any questions or needs. You can contact us directly, or leave your needs and contact information directly on the website, and we will contact you in time!