Pulley block classification and uses

Classification
The pulley block is composed of a certain number of fixed pulleys and movable pulleys and ropes that go around them. The pulley block has the function of saving labor and changing the direction of force, and is an important part of the lifting machinery. The number of ropes that share the weight of the pulley block is called the number of working wires. Usually, the name of the pulley block is expressed by the number of fixed pulleys and movable pulleys that make up the pulley block. For example, a pulley block consisting of four fixed pulleys and four movable pulleys is called a four-four pulley block.
use
In order to save effort and change the direction of power, the fixed pulley and the movable pulley can be combined into a pulley block.
Labor-saving size There is no pulley that saves both labor and distance.
When using a pulley block, the pulley block uses several lengths of rope to hang the object. The force used to lift the object is a fraction of the weight of the object.