Rapid locking device for coal mine explosion-proof door

The utility model relates to a rapid locking device for a coal mine explosion-proof door. An existing mine and air shaft explosion-proof door is locked by a chart weight and a bolt, the locking manner can prolong the operating time for locking the explosion-roof door and bring serious threat to ventilation safety of a mine due to the factors of corrosion and rustiness of the bolt, fussy operation of disassembling the chart weight and the like. The rapid locking device for the coal mine explosion-proof door comprises a screw rod, a handwheel, a base and a bracket, wherein one end of the screw rod is connected with a derrick connecting device, and the other end of the screw rod is provided with screw threads and is sleeved with a nut; the upper part of the nut is connected with the handwheel by a key; the lower part of the nut is arranged on the base by a bearing; the base is connected with the bracket by a screw or a bolt; and the lower part of the bracket is provided with a plurality of iron shoes. The rapid