The reason why a hand-operated pulley is called a light and small lifting device mainly relates to its appearance, structure, lightness, convenience, portability, and ease of use. On the construction site of electric power, it can be used by holding the hand-operated pulley to complete hoisting, lifting, or pulling operations. Hand-operated pulleys can be divided into two types: chain type and wire rope type. The chain type relies on turning the handle to drive the transmission mechanism that lifts heavy objects through the lifting chains. The structure of gears, ratchets, and pawls in the hand-operated pulley is basically the same as that of a manual winch. It operates manually and has a simple mechanical structure, making maintenance easy.