Material screening and impurity removing device

The utility model discloses a material screening and impurity removing device which comprises a rack, a vibration screening structure, a fan and a conveying structure. The rack comprises a main frame, an auxiliary frame and a conveyor supporting frame. The vibration screening structure comprises a vibration driving mechanism, a vibration screen and a hoisting assembly. The vibration screen comprises a screen plate and a frame arranged on the periphery of the screen plate. The conveying structure comprises a conveyor driving mechanism and a conveyor transmission mechanism, the conveyor driving mechanism comprises a motor support, a conveying motor, a driving chain wheel, a driven chain wheel and a transmission chain, and the conveyor transmission mechanism comprises a driving roller, a driven roller, a first shaft support, a second shaft support and a conveying belt; the auxiliary frame is arranged at the rear end of the main frame, the periphery of the vibrating screen is freely suspended on the main frame th