Coal mine underground fan anti-reversing device

The invention discloses a coal mine underground fan anti-reversing device. The coal mine underground fan anti-reversing device comprises an iron fan, a support rod, two semi-circular anti-reversing cover plates, a stopping rod and a rotating shaft, wherein the support rod is vertically arranged inside the iron fan; the anti-reversing cover plates are arranged on both sides of the support rod and hinged to the support rod; the stopping rod is arranged on one side of the anti-reversing cover plates, which is closed to the air inlet of the iron fan. During normal ventilation under a coal mine, the anti-reversing cover plates inside the iron fan can be automatically opened under the air pressure of a local fan, and the iron fan normally supplies power; when a gas accident happens, abrupt gas pressure is higher than the air pressure generated by the local fan, and under the pressure of the abrupt gas, the anti-reversing cover plates can be closed to block the iron fan and further reversed gas. Therefore, the coal