Screening mechanism for coal mining

The utility model discloses a coal mining screening mechanism which comprises a main box body, a feeding port is formed in the top end of the main box body, an arc-shaped protective cover is arranged in the main box body and located below the feeding port, the bottom end of the arc-shaped protective cover is connected with a sliding block in a sliding mode, the sliding block is in threaded connection with a lead screw, a motor is fixedly installed on one side of the main box body, and the motor drives the lead screw. A hollow disc is fixedly connected to the bottom end of the sliding block, a dustproof motor is fixed to the center of the interior of the hollow disc, the output end of the dustproof motor is in driving connection with a rotary disc rotationally connected with the bottom end of the hollow disc, and crushing teeth are fixedly installed at the bottom end of the rotary disc; the dust discharging pump on one side of the hollow disc communicates with the interior of the hollow disc, an air inlet is f