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Jiangsu Jiuyi Lifting Pulley, commonly known as a chain hoist, is a simple lifting machine that vertically lifts heavy objects via sprockets or drums. It is lightweight, compact, and easy to use, making it suitable for simple lifting tasks in construction. Lifting pulleys can be classified into single-sheave, double-sheave, and multi-sheave types based on the number of sheaves. According to the connection method with the load, they can be divided into four types: hook-type pulleys, chain-ring pulleys, eye-ring pulleys, and suspension-frame pulleys.

A lifting pulley is an important hoisting tool. It has a simple structure and is easy to use. It can repeatedly change the direction of the traction steel cable of the pulley or pulley block and lift or move objects. Especially when pulley blocks are combined with winches, masts, or other lifting machinery, lifting pulleys are widely used in construction and installation operations. Product specifications range from 0.03 to 320 tons, with wheel systems from single sheave to ten sheaves. Lifting attachments include hooks, chain rings, eye rings, and lifting beams for user selection. They are convenient to use, versatile, and can be operated manually or mechanically. They are mainly used in factories, mines, agriculture, electric power, construction, and other production and construction sites, as well as for machine installation and cargo lifting in docks, shipyards, and warehouses.

A single lifting pulley can only change the direction of force and does not save effort; however, a pulley block composed of two pulleys can save effort while also changing the direction of force. During lifting and transport operations, a single-sheave pulley can be used as a guide pulley; a pulley block can be used with a winch for lifting purposes.

The ball and roller bearing wheel cores used in lifting pulleys are national standard bearings, with two per sheave. Different specifications can be selected based on the lifting tonnage. Standard bearings are suitable for high-speed operation and are maintenance-free.

Jiangsu Jiuyi Lifting Pulley Classification and Structure

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

Pulleys are classified by usage into fixed pulleys, movable pulleys, guide pulleys, and pulley blocks, etc.

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

(2) Movable pulley. A movable pulley is installed on a moving axle and moves up or down together with the object being towed. 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. It can only change the direction of the rope and does not save effort.

(4) Pulley block. A pulley block is a lifting tool composed of a certain number of fixed pulleys, movable pulleys, and rigging. It can reduce the traction force and change the direction of the pulling force. In hoisting projects, pulley blocks are often used to lift heavy machinery with less traction force. For example, when using a 0.5 to 20 ton (5 to 200 kN) winch to pull the end of the rope of a pulley block (commonly called the running line), it can complete the hoisting of equipment or components weighing from several tons to hundreds of tons.