Lifting mechanism of cantilever crane: · A trolley running along the lower flange of the cantilever beam (manual chain pull or electric operation).    · Lifting device connected to the trolley: usually it is a chain electric hoist (commonly used), it can also be a chain hoist or a pneumatic hoist. The hoist provides vertical lifting action.  Auxiliary devices: · Stopper: Limit the rotation angle of the cantilever beam to prevent collision with the wall or equipment.    * Electrical system: provide power and control (button box or remote control) for electric hoist and possible electric operation/rotation.    ·Safety devices: such as the upper/lower limit switch of the hoist, overload limiter, etc.