A simple lifting machine that vertically lifts heavy objects through a sprocket or drum. It is lightweight, compact, and easy to use, suitable for simple lifting work in construction. Lifting blocks can be divided into single-sheave, double-sheave, and multi-sheave blocks according to the number of sheaves. According to the connection method between the block and the load, they can be divided into four types: hook type, chain ring type, ring type, and spreader beam type.

Lifting blocks are an important lifting tool. They are simple in structure and easy to use, and can repeatedly change the direction of the traction steel wire rope of the block and block assembly, as well as lift or move objects. Especially when combined into a block assembly with a winch, mast, or other lifting machinery, lifting blocks are widely used in construction and installation operations. Product specifications range from 0.03 to 320 tons, with sheave systems from single sheave to ten sheaves. The lifting attachments include hooks, chain rings, rings, and spreader beams for users to choose from. They are convenient to use, have a wide range of applications, and can be operated manually or mechanically. They are mainly used in factories, mines, agriculture, electric power, construction and other production operations, as well as for machine installation and cargo lifting in docks, shipyards, and warehouses.

A single lifting block can only change the direction of force and cannot save effort; however, a block assembly composed of two blocks can achieve the purpose of saving effort while changing the direction of force. During lifting and transportation operations, a single-sheave block can be used as a guide block; a block assembly can be used with a winch for lifting purposes.

The ball and roller bearing wheel cores used in lifting blocks are national standard bearings, with two per sheave. Different specifications can be adopted according to the lifting tonnage and position. Standard bearings are suitable for high-speed operation and are maintenance-free.



Lifting blocks, also known as iron blocks or pulleys, are used in lifting operations in conjunction with slings, lifting attachments, and winches. They are indispensable lifting tools for transporting and hoisting various structural equipment and components.

Pulleys are divided into fixed pulleys, movable pulleys, guide pulleys, and pulley assemblies according to their usage.

(1) Fixed pulley. A fixed pulley is used to support the movement of flexible parts. When the rope is under force, the rotor rotates, but the position of the shaft remains unchanged. In use, it can only change the direction of the steel wire rope and does not save effort.

(2) Movable pulley. A movable pulley is installed on a moving shaft and rises or falls together with the object being pulled. Using a movable pulley saves effort but cannot change the direction of force.

(3) Guide pulley. A guide pulley, also known as an open-side pulley, is similar to a fixed pulley and can only change the direction of the rope without saving effort.