Rivet gravity screening disc

The invention relates to the technical field of screening equipment, in particular to a rivet gravity screening disc which comprises a vibration disc base and a vibration hopper, a spiral lifting channel is arranged on the inner wall of the vibration hopper from bottom to top, a discharging port of the lifting channel is connected with a screening track, and the screening track is arranged along the circumferential face of the vibration hopper. A discharging port is formed in the tail end, in the rivet conveying direction, of the screening track, and the included angle between the normal of the screening track and the horizontal plane continuously changes between 0 degree and 90 degrees and 0 degree. Compared with the prior art, reliable rivet supply is achieved through angle control of the screening track, air blowing is not needed any more, in this way, corresponding electromagnetic valves, compressed air energy, corresponding air pipe joints and other accessories can be saved, cost is lower, noise is lower