In modern applications, the lifting chain is often used as a traction part of the machine. Direction power transmission is usually driven by the motor. The sprocket is used to use the chain to use. The use of sprocket wheels not only requires a distance standard for the chain. It is often required to have the hardness, wear resistance and extension of the chain. Standard spacing will not be a sprinkler when used. High hardness will be more abrasion in use. The extension rate is not easy to deform. After long -term use, the chain will not be able to pass the sprocket normally after the chain is stretched. Can not be used through the chain of the sprocket. Need to use a new chain.