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　　The crane pulley set is part of the lifting structure. The lifting structure is the main organization of the crane, consisting of prime mover, crane reel, wire rope, pulley set and hook. The rotational movement of the prime mover passes through the reel, the wire rope and the pulley group to form vertical up and down linear movements of the hook. Due to the different driving methods of the crane, the prime mover of the driving reel can be a motor, a hydraulic motor, or a certain driving shaft in a mechanical transmission. When the prime mover is a motor or a high-speed moving hydraulic motor, the torque and speed of the prime mover should be changed through the reducer. In order to improve the descent speed, the lifting structure often sets up a clutch to make the reel move away from the prime mover power rotate in reverse under the weight effect of the heavy object, allowing the heavy object and the empty hook to fall freely.

　　The crane pulley set supports and guide rope movement, which has the effects of guidance and balance. The crane pulley group consists of a fixed pulley and a moving pulley. It has the characteristics of a moving and fixed pulley. The pulley is divided into two types: a fixed pulley and a moving pulley. The fixed pulley only changes the direction of the power, and the moving pulley can save effort. Therefore, the crane pulley set can not only change the direction of power but also save labor, and can also act as a deceleration and acceleration device. When the lifting weight is large, a pulley set with a larger ratio should be selected to reduce the tension of the steel wire; when the lifting weight is light, a pulley set with a smaller ratio should be selected to reduce the number of times the wire rope is wound and improve work efficiency.

　　The crane pulley set is part of the lifting structure. The lifting structure is the main organization of the crane, consisting of prime mover, crane reel, wire rope, pulley set and hook. The rotational movement of the prime mover passes through the reel, the wire rope and the pulley group to form vertical up and down linear movements of the hook. Due to the different driving methods of the crane, the prime mover of the driving reel can be a motor, a hydraulic motor, or a certain driving shaft in a mechanical transmission. When the prime mover is a motor or a high-speed moving hydraulic motor, the torque and speed of the prime mover should be changed through the reducer. In order to improve the descent speed, the lifting structure often sets up a clutch to make the reel move away from the prime mover power rotate in reverse under the weight effect of the heavy object, allowing the heavy object and the empty hook to fall freely.

　　The crane pulley set supports and guide rope movement, which has the effects of guidance and balance. The crane pulley group consists of a fixed pulley and a moving pulley. It has the characteristics of a moving and fixed pulley. The pulley is divided into two types: a fixed pulley and a moving pulley. The fixed pulley only changes the direction of the power, and the moving pulley can save effort. Therefore, the crane pulley set can not only change the direction of power but also save labor, and can also act as a deceleration and acceleration device. When the lifting weight is large, a pulley set with a larger ratio should be selected to reduce the tension of the steel wire; when the lifting weight is light, a pulley set with a smaller ratio should be selected to reduce the number of times the wire rope is wound and improve work efficiency.