The pulley block of crane is labor-saving and can change the direction of force acting.
Pulley block of crane
Overview of pulley block:
It is a fixed pulley, which is assembled by the hook group. It is fixed on the structure and is composed of several fixed pulleys and moving pulleys. It can save labor and change the direction of force.
Classification of pulleys:
Pulley can be divided into working pulley and balance pulley, which can rotate around the center axis of the commonly used machinery.
The material of pulley is HT15-33 cast iron, and ZG35 II cast steel is used for grab and special purpose crane. In order to improve the efficiency of the pulley block and improve the service conditions, the roller bearings are all used in rolling bearings.
Pulley rope groove:
When choosing the pulley rope groove, the groove radius often takes R=0.6d, and the contact surface between the wire rope and the rope groove is as big as possible.
Pulley block use:
Pulley block is widely used in cranes, winches, elevators and other machinery, is an important part of hoisting machinery.