Dustfall ventilation device with adjustable ventilation rate for coal mine

The invention discloses a dustfall ventilation device with an adjustable ventilation rate for a coal mine. The dust suppression ventilation device comprises a base, a driving motor and a rotating block; the inner surface of the right side of the base is fixedly connected with a fixing plate; first exhaust holes are formed in the inner surface of the fixing plate; filter screen layers are arrangedon the inner surfaces of the first exhaust holes; a movable block is arranged at the inner surface of the base; second exhaust holes are formed in the inner surface of the movable block; the outer surface of the movable block is fixedly connected with a handle; fixing threads are formed in the outer surface of the upper end of a movable rod; the movable rod is connected with a second connecting shaft; and the rotating block is arranged on the inner surface of the lower end of the base. The dustfall ventilation device with the adjustable ventilation rate for the coal mine is provided with the adjustable movable rod, so