Reverse circulation drilling device and process for soft projecting coal seam
A technology of protruding coal seams and reverse circulation, applied in drilling equipment, drilling equipment and methods, earthwork drilling and mining, etc., can solve the problem that it is difficult to deal with collapsed and shrinking strata, cannot effectively improve the on-site operating environment, and the injection hole phenomenon is impossible Avoid other problems to achieve the effect of avoiding spray hole phenomenon, improving drilling efficiency and reducing drilling rig investment
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[0031] In order to make the realization technical means, creation features, achievement goals and effects of the present invention easy to understand, the present invention will be further described below with reference to specific embodiments.
[0032] like figure 1 As shown, the reverse circulation drilling equipment for soft outburst coal seams includes a drilling rig 1, a double-wall drill pipe 2, a dual-channel gas tap 7, a drill bit 4 and an air compressor 3. The drilling rig 1 is provided with a power head 6. The wall drill pipe 2 is installed through the power head 6, and the inner pipe at one end of the double-wall drill pipe 2 is communicated with the rubber hose 10 through the double-channel gas tap 7, and the end of the rubber pipe 10 is connected with a coal powder receiving device 5. 7 is provided with an air box 8 communicating with the annular channel of the inner and outer pipes of the double-wall drill pipe 2, the air box 8 is connected with the air compresso...
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