Mine air window capable of automatically adjusting air volume

A mine air window capable of automatically adjusting air volume comprises a base, a supporting frame is arranged at the top end of the base, an electric appliance cabinet is fixed to the top end of the supporting frame, a plc controller is arranged in the electric appliance cabinet, supporting plates are arranged in the supporting frame, a first blade is arranged between the two supporting plates, and supporting shafts are fixed to the two ends of the first blade. A second blade and a third blade are sequentially arranged below the first blade from top to bottom, the width of the first blade is larger than that of the second blade, the width of the second blade is larger than that of the third blade, the second blade and the third blade are arranged above the first blade, and a rotating rod is arranged between the supporting plate and the supporting frame; the lower end of the rotating rod is rotatably arranged on the supporting frame, a second bevel gear is fixed to the rotating rod, the first bevel gear is