Pulley is a kind of hardware products commonly used in the modern furniture industry and door and window industry. In practical applications, the pulleys are generally used in the form of pulley blocks, but the pulley blocks in the door and window industry are still in the design of the pulley block in the furniture industry. There are certain technical requirements and principles in the process. What are the pulley design principles?
The so-called pulley block refers to the matching of several fixed pulleys and moving pulleys, which can achieve the purpose of saving labor and changing the direction of force action. In the process of designing the pulley block, certain mechanics knowledge needs to be considered. Therefore, the design principles of the pulley block mainly include:
1, the number of pulleys, the principle is: when n is an odd number, the rope driven pulley is the start. When using a moving pulley, there are three sections of rope, and each additional one of the moving pulleys adds two pieces of rope. For example: n=5, you need two moving pulleys (3+2). When n is even, the rope starts from the fixed pulley, and all the movable pulleys are only used by two ropes. For example: n=4, you need two moving pulleys (2+2).
2. Secondly, determine the number of pulleys according to the requirements. The principle is: general: two ropes are equipped with one moving pulley, and one moving pulley is generally equipped with a fixed pulley. When the direction of force action does not require change, the even-numbered section of the rope can be reduced by a fixed pulley; to change the direction of force action, a fixed pulley is required.
In summary, the design principles of the pulley block can be summarized as: odd-moving even; one move is fixed, even-number is reduced, and the change is added.
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