How does the crane pulley system work?

The pulley block is the main load-bearing component of the crane. Due to different usage conditions, it can change the working tension within the flexible structure or change its movement speed and direction. It can be used as a guide wheel, and more often it forms a pulley block.
There are two types of pulleys for cranes: fixed pulleys and movable pulleys, which are combined to form a pulley block.
Fixed pulley of crane
The fixed pulley is essentially an equal-arm lever, which does not save effort or worry, but can change the direction of force.
Characteristics of fixed pulley: Pulling the hook code through the fixed pulley does not save effort. With or without a fixed pulley, the readings of the spring scale are the same. It can be seen that using a fixed pulley does not save effort, but it can change the direction of force. In many cases, changing the direction of force makes the work easier.
Crane movable pulley
The movable pulley is essentially a lever, and the power arm is twice the resistance arm, saving 1/2 of the force and 1 times the distance.
Characteristics of movable pulley: Using a movable pulley can save half the force and half the distance. This is because when using a movable pulley, the hook is suspended by two sections of rope, and each section of rope only carries half the weight of the hook. Although using a movable pulley can save effort, the distance of power movement is greater than the distance the hook is lifted, that is, distance comes at a cost. Crane pulley block
The crane pulley block consists of a fixed pulley and a movable pulley, which can save effort and allow the direction of force to be changed.
The pulley block uses several sections of rope to lift an object, and the force used to lift the object is a small part of the total weight. The free end of the rope that passes around the pulley is counted as one section, while the section that passes around the fixed pulley is not counted. Using a pulley block can save effort, but it costs distance, and the distance of power movement is greater than the distance of weight movement.
The purpose of the crane pulley block is to save and change the direction of power. A fixed pulley and a movable pulley can be combined to make a pulley block.
Saved force: When using a pulley block, the pulley block hangs an object through several sections of rope, and the force used to lift the object is a small part of the weight of the object.
Characteristics of crane pulley blocks. Through experiments on pulley blocks, it is not difficult to find that using pulley blocks can save effort, but it requires distance - the moving distance of the power is greater than the lifting distance of the goods.