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　　The pulley sets are used in industrial use to pull up heavy objects faster and easier to complete the project needs.

　　In fact, to put it bluntly, pulley sets make people more labor-saving. How is the principle of labor-saving stipulated?

　　Let's first understand a formula:

　　s=hn. V1/nF1/n1/n1/n1/n1/n1/n1/n)*GGeneral

　　s: The distance at which the rope moves at the free end.

　　VRope: 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 10.5pt; mso-spacerun: 'yes'">

　　h: The height at which heavy objects are lifted. V: The speed of object movement (ascending and falling) 　n: Number of sections of ropes that bear load.

　　GTotal: weight+Pulley pulley weight(GGGGGGGGGGGGGGGGGGGGGGGGGGG New Roman">+Gslip).

　　The principle is: When the number is odd, the rope driven pulley starts. When using a moving pulley, there are three sections of ropes, and then two sections of ropes are added for each additional moving pulley. For example: n=5, two moving pulleys (3+2). When the rope is even, the rope starts from the fixed pulley, and at this time all moving pulleys are only borne by two sections of rope. For example: n=4, two moving pulleys (2+2). Secondly, determine the number of fixed pulleys according to requirements. The principle is: general: two ropes are equipped with a moving pulley, and one moving pulley is generally equipped with a fixed pulley. When the direction of force action is not required to be changed, an even-numbered rope can reduce a fixed pulley; to change the direction of force action, a fixed pulley needs to be added.

　　To sum up, the design principles of pulley sets can be summarized as: odd movement and even set; one movement is set, even number is set, and even number is set, and change direction is added.

　　The pulley sets are used in industrial use to pull up heavy objects faster and easier to complete the project needs.

　　In fact, to put it bluntly, pulley sets make people more labor-saving. How is the principle of labor-saving stipulated?

　　Let's first understand a formula:

　　s=hn. V1/nF1/n1/n1/n1/n1/n1/n1/n)*GGeneral

　　s: The distance at which the rope moves at the free end.

　　VRope: 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 'Songyi': 10.5pt; mso-spacerun: 'yes'">

　　h: The height at which heavy objects are lifted. V: The speed of object movement (ascending and falling) 　n: Number of sections of ropes that bear load.

　　GTotal: weight+Pulley pulley weight(GGGGGGGGGGGGGGGGGGGGGGGGGGG New Roman">+Gslip).

　　The principle is: When the number is odd, the rope driven pulley starts. When using a moving pulley, there are three sections of ropes, and then two sections of ropes are added for each additional moving pulley. For example: n=5, two moving pulleys (3+2). When the rope is even, the rope starts from the fixed pulley, and at this time all moving pulleys are only borne by two sections of rope. For example: n=4, two moving pulleys (2+2). Secondly, determine the number of fixed pulleys according to requirements. The principle is: general: two ropes are equipped with a moving pulley, and one moving pulley is generally equipped with a fixed pulley. When the direction of force action is not required to be changed, an even-numbered rope can reduce a fixed pulley; to change the direction of force action, a fixed pulley needs to be added.

　　To sum up, the design principles of pulley sets can be summarized as: odd movement and even set; one movement is set, even number is set, and even number is set, and change direction is added.