Device and method for analyzing gas component change in coal body drilling process

The invention discloses a device and method for analyzing gas composition changes in the coal body drilling process. The device comprises a closed box body, a coal sample test piece, an air extracting pump, a gas drying box and a chromatographic analyzer, wherein a drill rod penetrating hole is formed in the middle of one side of the closed box body, a plurality of fixing adjusters are arranged on the closed box body, and an air extracting guide pipe is arranged in a drill rod. The method comprises the following steps: 1, processing and manufacturing a coal sample test piece; 2, fixing the coal sample test piece; 3, carrying out single-time drilling of the drill rod; 4, extracting gas in the coal sample test piece, and analyzing components of the gas; 5, repeating the step 3 to the step 4 multiple times; and 6, comparing and analyzing the component change of the gas in the coal sample test piece in the drilling process. According to the invention, the device is reasonable in structural design and simple and c