Core rod circulating walking beam roller connecting device

The utility model discloses a mandrel circulating stepping beam roller connecting device which comprises a roller base, rollers are arranged at the top of the roller base, the rollers are symmetrically arranged in two rows, a mandrel is arranged above the two rows of rollers, a cooling mechanism is arranged above the mandrel, a roller supporting seat is arranged at the bottom of the roller base, and a stepping beam is arranged between every two adjacent rollers. A supporting seat base is arranged at the bottom of the stepping beam, a motor is arranged on one side of the roller base, and the stepping beam is in transmission connection with the motor and connected with the rollers through shafts. By arranging a series of structures, the connection of the roller and the shaft is changed into an end face tooth structure, so that the contact area can be increased, the stress of the roller is uniform, the damage of a flat key caused by concentrated stress is reduced, the concentricity of the roller and the shaft is