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　　The application of semi-closed hook groups is becoming more and more common, but there are very few staff members who can correctly use semi-closed hook groups. If the semi-enclosed hook group is used improperly, many problems will arise.

　　1. If the small crane is running unstable, ziply-stayed, obliquely-carrying, etc. , the wire rope or hook group will swing or shake, which can easily cause the pulley assembly on the hook group to collide with other objects. Therefore, the edges of the pulley assembly of the hook group are easily damaged or broken, so new pulley assembly must be repaired or replaced in time.

　　2. The wear of the hook mouth of the semi-closed hook group is usually caused by the incorrect way of hanging the hook on the hook. After the hook is hung on the hook, it will generally adjust itself due to gravity, which will cause the wire rope hanging on the groove to slide and make the hook buckle wear out.

　　3. Affected by concentrated stress, some threaded parts and hollow cutter grooves of nuts, bolts and other components of the hook group may be damaged, worn or cracked. Therefore, daily maintenance and safety inspections must be carried out. When operating in special environments, small cranes should pay attention to the impact of the environment on the hook set, such as corrosive gases, high temperatures, etc.

　　4. When lifting objects, affected by the weight, tension, shear stress and bending moment of the lifting objects, some parts on the hook are at risk of straightening, pulling or shearing, which is called a dangerous part. There are usually three dangerous parts on the hook. If the wear depth of the dangerous part of the hook is greater than 10% of the overall thickness, it is recommended that Henan Zhongyuan hoisting accessories be scrapped, otherwise it is easy to cause danger.

　　The application of semi-closed hook groups is becoming more and more common, but there are very few staff members who can correctly use semi-closed hook groups. If the semi-enclosed hook group is used improperly, many problems will arise.

　　1. If the small crane is running unstable, ziply-stayed, obliquely-carrying, etc. , the wire rope or hook group will swing or shake, which can easily cause the pulley assembly on the hook group to collide with other objects. Therefore, the edges of the pulley assembly of the hook group are easily damaged or broken, so new pulley assembly must be repaired or replaced in time.

　　2. The wear of the hook mouth of the semi-closed hook group is usually caused by the incorrect way of hanging the hook on the hook. After the hook is hung on the hook, it will generally adjust itself due to gravity, which will cause the wire rope hanging on the groove to slide and make the hook buckle wear out.

　　3. Affected by concentrated stress, some threaded parts and hollow cutter grooves of nuts, bolts and other components of the hook group may be damaged, worn or cracked. Therefore, daily maintenance and safety inspections must be carried out. When operating in special environments, small cranes should pay attention to the impact of the environment on the hook set, such as corrosive gases, high temperatures, etc.

　　4. When lifting objects, affected by the weight, tension, shear stress and bending moment of the lifting objects, some parts on the hook are at risk of straightening, pulling or shearing, which is called a dangerous part. There are usually three dangerous parts on the hook. If the wear depth of the dangerous part of the hook is greater than 10% of the overall thickness, it is recommended that Henan Zhongyuan hoisting accessories be scrapped, otherwise it is easy to cause danger.