Protective device for air door of coal-mining roadway

The utility model relates to a protective device for an air door of a coal-mining roadway, and the air door is arranged in the roadway. An air door bumper comprises a cross beam and two vertical rods, wherein the vertical rods are fixed on the outer side of the air door in the width direction of the roadway, and distances are formed between the vertical rods and the air door; the distance between the vertical rods is smaller than the length of the cross beam; and one end of the cross beam is arranged on one vertical rod through a vertical rotating shaft, the other vertical rod is positioned between the cross beam and the air door, and the other end of the cross beam is connected with the air door. The protective device for the air door of the coal-mining roadway adopts the rotatable cross beam, and a certain distance is formed between the cross beam and the air door, so that equipment can touch the cross beam when passing through the roadway; and the cross beam is limited by the other vertical rod, so that th