Straw returning device and operation method

The straw returning device comprises a traction device and an ejection device, the traction device comprises a roller, a gear ring, a traction frame and a movable frame, the ejection device comprises an ejection frame, a sliding block and a cam, a plurality of roller holes are evenly distributed in the surface of the roller, a gear ring is arranged on one side of the gear ring, a plurality of reinforcing ribs are evenly distributed in the middle of the gear ring, and a center hole is formed in the middle of each reinforcing rib. One side of the movable frame is provided with two symmetrical traction frame holes, the other side of the traction frame is provided with a traction hole, two sides of a roller hole are respectively provided with a gear ring, each gear ring is fixedly connected with the inner side of a roller, the inner side of the traction frame is fixedly connected with a center shaft, center holes in two sides are rotatably connected with two sides of the center shaft, and the two gear rings rotat