Three-dimensional annular conveying line with power and free functions

The invention discloses a three-dimensional annular conveying line with a power and free function, which comprises a rack, a three-dimensional annular guide rail, a single-side sliding block, a vertical mounting plate, a pusher dog rod, a workpiece placing plate, a driving chain wheel, a chain, a driven chain wheel with an upturning pusher dog and a power and free mechanism, the pusher dog rod is arranged at the bottom of the single-side sliding block and can be movably combined with the upturning pusher dog of the driven chain wheel; the power and free mechanism comprises a shaft, a bearing, a chain wheel, friction plates located on the two sides of the chain wheel, a heat dissipation support arranged on the outer side of each friction plate, an axial bias spring and a fastening nut, the chain wheel is provided with a sleeve extending outwards in the axial direction from a body, and the heat dissipation supports and the friction plates are wrapped in the sleeve. And oil stains and dust are prevented from ent