Common materials for pulley
Brief introduction of pulley:
Pulley is a simple machine used to lift heavy objects and save effort.
A pulley is a small wheel with grooves around it that can rotate around its axis. A simple machine composed of a disc with a groove that can rotate around the central axis and a flexible cable (rope, tape, steel cable, chain, etc.) that crosses the disc is called a pulley. According to whether the position of the central axis of the pulley moves, the pulley can be divided into "fixed pulley" and "movable pulley"; the central axis of the fixed pulley is fixed and the central axis of the movable pulley can be moved, each with its own advantages and disadvantages. The fixed pulley and the movable pulley can be assembled together to form a pulley block, which not only saves labor but also changes the direction of the force.
Classification, number
Fixed pulley, movable pulley, pulley block (or divided into single pulley, double pulley, three pulley, four pulley and even multiple wheels).
Material
Wooden pulleys, steel pulleys and engineering plastic pulleys can be made of various materials according to actual requirements.
There are three types of pulleys on the market: plastic pulleys, metal pulleys and fiberglass pulleys. The characteristics are as follows:
1. The metal pulley has high strength, but is prone to noise when it comes in contact with the track.
2. Carbon fiberglass pulley, with roller bearing, smooth sliding, durable wear-resistant, box-type closed structure is effective for dustproof, more suitable for windy and sandy northern areas, two anti-jump devices ensure safe and reliable when sliding.
3. The wheels of some low-grade sliding doors are made of organic plastic, which is very easy to wear and deform. When the time is long, it will fluctuate. The open wheel structure is easy to enter the dust and wear the internal bearings, which is difficult to ensure the flexibility of the sliding. An anti-jump device does not even have anti-jump The device is easy to derail when pushing and pulling, which is very unsafe.
