Intelligent extraction device and extraction method for gas in coal mine tunnel

The invention relates to the field of gas extraction devices, in particular to an intelligent gas extraction device in a coal mine roadway, which comprises an extraction drill pipe, a sealing mechanism is movably connected in the extraction drill pipe, an inflation pipe is arranged on one side of the extraction drill pipe, and an exhaust mechanism is movably connected in the inflation pipe. And an inert gas transmission pipe is mounted at the right end of the gas filling pipe. The intelligent gas extraction device in the coal mine tunnel is composed of a sealing mechanism and an exhaust mechanism. After the extraction drill pipe drills into a gas layer, the left end of the extraction drill pipe relieves rock-soil abutting, at the moment, the compression spring elastically recovers to drive the T-shaped movable rod to move leftwards, four arc-shaped supporting blocks move oppositely and drive the sealing rubber ring to be opened, and the outer ring of the sealing rubber ring is extruded out of the interior of