Dust falling device for underground coal mine

The underground coal mine dust falling device comprises a base, the top wall of the base is fixedly connected with a collecting box, the top wall of the collecting box is fixedly connected with a dust falling box, the inner top wall of the dust falling box is fixedly connected with a vertical plate, and the side wall of the vertical plate and the inner side wall of the dust falling box are jointly and rotationally connected with a reciprocating lead screw. The side wall of the reciprocating lead screw is in threaded connection with a threaded block, the bottom wall of the threaded block is rotationally connected with a rotating shaft, the side wall of the rotating shaft is fixedly connected with a gear, one end of the rotating shaft is fixedly connected with a cleaning brush, the inner side wall of the dust falling box is fixedly connected with a rack plate, and the side wall of the vertical plate and the inner side wall of the dust falling box are jointly and fixedly connected with a filter screen. The verti