A Chain Pulley (also known as a hand chain hoist) is a mechanism used to lift and lower heavy loads using a chain. Chain Pulley contains two wheels in which the chain is wound around. When the chain is pulled, it winds around the wheels and starts to lift the item that is attached to the rope or chain via a hook. Chain Pulley can also be attached to lifting slings or chain bags to lift the load more evenly.
How does Chain Pulley work?
A Chain Pulley contains a lifting chain, a hand chain, and a grabbing hook. Most chain Pulleys is operated using electricity, but manual chain Pulley can be used too. First, the chain Pulley 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 that lifts the load from the ground.
The physics behind a chain Pulley is very simple and has been used for lifting heavy objects for a long time. Chain Pulley uses mechanical advantage to convert small force over a long distance to large force over a short distance, this is possible by using multiple larger and smaller gears in the chain hoist mechanism.
To lift a load, the chain pulley operator needs to pull down the hand chain, this turns the cog and axle which goes through the lifting mechanism. Inside the lifting mechanism are multiple gears that raise the mechanical work applied when pulling the hand chain for a dozen times using gear ratio, allowing to easily lift loads with multiple ton capacity.
So when the hand chain is pulled, the gear which is rotated by the hand chain turns the driveshaft and gears which turn the load chain sprocket, this also rotates the load chain that is looped over the load chain sprocket and lifts a load. Larger gears move slower than smaller gears but create more strength, this is why chain pulley lifts load very slowly when compared to a hydraulic hoist.
At the end of the lifting chain is a grab hook, which permits to easily attach and detach a load. Also, most Chain Pulley lifting mechanisms have a ratchet or braking system that prevents the load from slipping back but allows to lower a load by pulling the other side of the hand chain.
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