The cast pulley block consists of a number of forging fixed pulleys, forging moving pulleys and ropes that wind them. The pulley block has the function of saving labor and changing force direction, and is an important part of the hoisting machinery. The number of ropes that the pulley block collectively bears to build the weight is called the number of working lines. Typically, the name of a forging pulley block is represented by the number of forging fixed pulleys and forging moving pulleys, for example, a pulley block composed of four forging fixed pulleys and four forging moving pulleys is called a four-four pulley block.
Use of Casting Pulley Block:
In order to save labor and at the meantime to change the force direction, the fixed pulley and the movable pulley can be combined into a pulley block.
When using a pulley block, the pulley block hangs the object with several lengths of rope, and the force used to lift the object is a fraction of the weight of the object.
Pulley Block Features
Experimenting with the pulley block makes it easy to see that although the use of the pulley block saves effort, it takes a distance—the distance the power moves is longer than the distance the cargo rises.
Pulley Group Winding Method
About the winding method of the pulley block, first of all to analyze the problem requirements, how many times to reduce the force( a fraction of the original force) F = G / n, n is the number of lengths of the rope that bears the weight. Note: If n is even, then the starting point of the winding is on the upper fixed pulley; if n is odd, the starting point of the winding is on the moving pulley below.