Sieving device for processing based on silicon nitride powder

The screening device comprises a machine box, a screening box, a vibration motor, a feeding port and a discharging port, the screening box is arranged at the top of the machine box, the bottom of the screening box is fixedly connected with a fixing box, the two sides of the inner wall of the fixing box are fixedly connected with fixing blocks, and the two sides of the inner wall of the fixing box are fixedly connected with the vibration motor. The two sides of the vibration motor are fixedly connected with the inner walls of the fixing blocks. According to the screening device, the gear motor is arranged, the gear motor rotates to drive the stirring column to rotate so that the scraping plate can rotate to evenly spread raw materials during feeding, large particles can be discharged through the discharging port through the scraping plate, small particles can fall down through the filter screen, and the problems that during feeding of an existing screening device, material accumulation is likely to happen, and