Rice primary screening device stable in operation

The utility model relates to the technical field of rice primary screening equipment, and discloses a stable-operation rice primary screening device which comprises a screening box, downward supporting legs are fixedly installed on the periphery of the bottom of the screening box, an upward feeding port is fixedly connected to the top of the screening box, and a downward collecting groove is fixedly connected to the bottom of the screening box. And the bottom of the collecting tank is fixedly connected with a discharging pipe. According to the rice screening device, rice entering the screening box is separated from impurities through the screening plate, when the screening plate is blocked, the rotating motor is started, the rotating motor drives the rotating shaft to rotate through the output end, and due to the fact that the disc and the rotating shaft are eccentrically arranged, the diameter, making contact with the screening plate, of the edge of the disc changes periodically; the sieve plate is movably m