Frame overturn unit

The utility model relates to a frame turnover unit, which comprises a pair of big swivels that are arranged in parallel and used for placing a frame, wherein arc-shaped end surfaces of the big swivels are provided with chain wheel structures; gears which are driven by speed reduction gear boxes and used for driving the big swivels to rotate by the chain wheel structures are respectively arranged below the big swivels; and two sides of the gears below the big swivels are respectively provided with guide wheels which are used for bearing and positioning. The big swivels take shape of semi-circle with downward arc-shaped end surface, so that the frame is convenient to place. The gears and the guide wheels are arranged on a bracket, so that two ends of the frame can be controlled to lift synchronously. Hydraulic lift control mechanisms for controlling the lift of the bracket are arranged at two sides of the bracket. The bracket is symmetrically provided with slanting poles which are used for limiting the guide wh