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Observing the dangerous cross-sections of the semi-enclosed hook group can analyze its stress conditions, and you can have an in-depth understanding of the three dangerous cross-sections.

The semi-closed hook group is subject to shear stress on the I-I section of the hook, and the shear stress has a tendency to cut off the hook; on the I-I section of the injection hook (the section is located at the position of the thread relief groove at the tail of the injection hook), it is affected by tensile stress, and the 5t-N tensile stress of the injection hook is Force trend; on the II section of the injection hook, it is subject to both tensile stress and moment. Therefore, the inner side of the II section of the injection hook is affected by tensile stress, while the semi-closed hook group model, =5t-N, is affected by tensile stress. According to calculations, the inner tensile stress is more than twice as large as the outer compressive stress. Therefore, the hook house is made thicker on the inside and thinner on the outside.

The hooks of the semi-enclosed hook set must have a certificate of qualification when leaving the factory, and there must be a rated lifting capacity mark in the low-stress area. The hook body inspection of the semi-closed hook group is generally cleaned with kerosene, and then a 20x magnifying glass is used to observe whether there are fatigue cracks in the hook body. In particular, the inspection of the dangerous section must be careful and careful.

The undercut groove of the hook column screw part of the semi-closed hook group is where stress is concentrated. Care should be taken to check whether there are cracks. The plate hooks should also be checked for looseness and wear on fasteners such as sleeves, pins, holes, and earrings. For the hook bodies of some large heavy-duty cranes, non-destructive testing methods are also used to check whether there are internal defects.

Observing the dangerous cross-sections of the semi-enclosed hook group can analyze its stress conditions, and you can have an in-depth understanding of the three dangerous cross-sections.

The semi-closed hook group is subject to shear stress on the I-I section of the hook, and the shear stress has a tendency to cut off the hook; on the I-I section of the injection hook (the section is located at the position of the thread relief groove at the tail of the injection hook), it is affected by tensile stress, and the 5t-N tensile stress of the injection hook is Force trend; on the II section of the injection hook, it is subject to both tensile stress and moment. Therefore, the inner side of the II section of the injection hook is affected by tensile stress, while the semi-closed hook group model, =5t-N, is affected by tensile stress. According to calculations, the inner tensile stress is more than twice as large as the outer compressive stress. Therefore, the hook house is made thicker on the inside and thinner on the outside.

The hooks of the semi-enclosed hook set must have a certificate of qualification when leaving the factory, and there must be a rated lifting capacity mark in the low-stress area. The hook body inspection of the semi-closed hook group is generally cleaned with kerosene, and then a 20x magnifying glass is used to observe whether there are fatigue cracks in the hook body. In particular, the inspection of the dangerous section must be careful and careful.

The undercut groove of the hook column screw part of the semi-closed hook group is where stress is concentrated. Care should be taken to check whether there are cracks. The plate hooks should also be checked for looseness and wear on fasteners such as sleeves, pins, holes, and earrings. For the hook bodies of some large heavy-duty cranes, non-destructive testing methods are also used to check whether there are internal defects.