Dedusting and filtering device for coal mine ventilation

The utility model discloses a dedusting and filtering device for coal mine ventilation, which comprises a box body, an air suction cover is fixedly sleeved in the box body, a fan is fixedly sleeved in the air suction cover, a filter screen is fixedly sleeved in the air suction cover, a support shaft is connected in the filter screen through a bearing, fan blades are fixedly connected on the support shaft, and the fan blades are fixedly connected on the support shaft. A connecting shaft is welded to the air suction cover, a stop lever is installed on the outer side of the connecting shaft through a bearing, a torsional spring is arranged on the outer side of the connecting shaft, a backflow pipe is fixedly connected into the box body in a sleeved mode, a connecting pipe is rotationally connected to the outer side of the backflow pipe, and a gear ring is fixedly connected to the outer side of the connecting pipe in a sleeved mode. By arranging the backflow pipe, the connecting pipe, the gear ring, the motor, th