The chain hoist inherits the advantages of the fixed pulley. It uses the upgraded version of the fixed pulley, and uses the technology of the reverse reducer brake and the chain pulley group. The two-stage spur gear rotation structure is symmetrically arranged, durable, efficient, simple, This article explains the structure and principle of the chain hoist. The use principle of the chain hoist is to pull the manual chain and the sprocket wheel to rotate, the friction plate ratchet and the brake seat are pressed together to rotate together, and the long axis of the tooth rotates the plate gear, the short axis of the tooth and the spline hole gear. In this way, the hoisting sprocket installed on the spline hole gear drives the hoisting chain, thereby smoothly lifting the weight. It can brake by itself under load. The pawl is engaged with the ratchet wheel under the action of the spring. The brake works safely. The ratchet friction plate type one-way brake is used. The working principle of the hand hoist: When the product is lifted, the operator stands on the side of the hand sprocket. , Pull down the bracelet chain to make the bracelet wheel rotate clockwise, so the bracelet chain wheel is driven by each transmission gear to make the lifting chain wheel rotate, and the lifting chain drives the goods to lift. Under the action of the brake, the cargo can stay in any position in the air without falling down by itself. Pull down the other bracelet, and when the bracelet wheel rotates counterclockwise, the pawl releases the ratchet and the self-weight on the lower hook. Under the effect of, it can drop smoothly. When the bracelet stops pulling, the brake immediately restores the braking function, so that the cargo can be stopped at any position. The chain hoist can be directly hung on a fixed object and used as a fixed type for fixed-point hanging, or it can be equipped with a running trolley to manually slide on the monorail and used as a manual monorail crane.