Cantilever crane, also known as jib crane, column crane, single boom crane, is a kind of light and small lifting equipment. It is mainly composed of columns, slewing arms, electric or manual hoists, and driving devices, which can rotate and lift heavy objects in a certain range 360°, with simple structure, easy operation, and small footprint, and are widely used in workshops, warehouses, and processing stations for short distances and frequent lifting operations.