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　　In the ancient Chinese book "Mo Jing", the pulley set was qualified to record. The book says that the pulley with a fixed central axis is called a fixed pulley, which is a deformed equal arm lever that does not save effort but can change the direction of force. The pulley that moves with the central axis and the heavy object is called a moving pulley. It is a deformed unequal arm lever that can save half of the force, but does not change the direction of the force. In practice, a certain number of moving pulleys and fixed pulleys are often combined into various types of pulley sets. The pulley set saves effort and changes the direction of force.

　　The differential pulley (commonly known as hand-pulled hoists) commonly used in factories is also a pulley set. Pullax sets are widely used in cranes, hoists, elevators and other machinery.

　　The pulley set is made up of several fixed pulleys and moving pulleys, which can achieve the purpose of saving effort and changing the direction of force action. During use, the amount of effort saved and the method of winding the rope depends on the effect of the pulley set. The moving pulley is carried by two ropes, that is, each rope bears the force of the object and the moving pulley is one-half of the total weight of the object and the moving pulley.

　　In the ancient Chinese book "Mo Jing", the pulley set was qualified to record. The book says that the pulley with a fixed central axis is called a fixed pulley, which is a deformed equal arm lever that does not save effort but can change the direction of force. The pulley that moves with the central axis and the heavy object is called a moving pulley. It is a deformed unequal arm lever that can save half of the force, but does not change the direction of the force. In practice, a certain number of moving pulleys and fixed pulleys are often combined into various types of pulley sets. The pulley set saves effort and changes the direction of force.

　　The differential pulley (commonly known as hand-pulled hoists) commonly used in factories is also a pulley set. Pullax sets are widely used in cranes, hoists, elevators and other machinery.

　　The pulley set is made up of several fixed pulleys and moving pulleys, which can achieve the purpose of saving effort and changing the direction of force action. During use, the amount of effort saved and the method of winding the rope depends on the effect of the pulley set. The moving pulley is carried by two ropes, that is, each rope bears the force of the object and the moving pulley is one-half of the total weight of the object and the moving pulley.