A pulley is a wheel on an axle that is designed to support movement of a cable or belt along its circumference. Pulleys are used in a variety of ways to lift loads, apply forces, and to transmit power. A pulley is also called a sheave or a drum and may have a groove between two flanges around its circumference. The drive element of a pulley system can be a rope, cable, belt, or chain that runs over the pulley inside the groove.
Pulley Blocks means that pulleys are assembled to form a block and tackle in order to provide mechanical advantage to apply large forces. Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another.
Pulley systems are used in the real world to lift large masses onto tall heights. The pulley system consists of one or more pulleys and a rope or a cable. The number of pulleys used may increase or decrease the mechanical advantage of the system. Generally, the higher the mechanical advantage is, the easier it is to lift the object that is being lifted. The greater the number of pulleys in the system, the less force it will take to lift an object.
According to the number of wheels, Pulley block is divided into Single Pulley Block/Snatch Block, Double Wheels Pulley Block/Double Sheave Block, Three Wheels Pulley Block/Treble Sheave Block, Four Wheels Pulley Block/Four Sheave Block, Five Wheels Pulley Block/Five Sheave Block, Six Wheels Pulley Block/Six Sheave Block, and Eight Wheels Pulley Block/Eight Sheave Block.
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