Скачать или смотреть KNOW ABOUT CHAIN PULLEY BLOCKS

Science and Technology,Environment Science
What is a block and tackle(Chain Pulley Block) system?
A block and tackle (also known as a chain pulley block) is a mechanism that can be used to lift and lower heavy loads using a chain.
In a standard block and tackle system, the chain is wound around two wheels. When the chain is pulled, it winds around the wheels and begins to lift the load that's attached to the chain.
Chain blocks can be attached to lifting slings or chain bags to lift the load more evenly.
How a block and tackle works?
A block and tackle system is typically made up of a lifting chain, a hand chain and a grabbing hook.
First, the chain block needs to be connected to the load via the grabbing hook. Then, when the hand chain is pulled, the chain tightens its grip on the wheel and forms a loop inside the mechanism - causing a tension which lifts the load from the ground.
This system can be used to lift loads manually, although electric block and tackle systems are popular because they require less physical exertion.
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