Disposable telescopic drilling tool used for fire preventing and extinguishing grouting in underground coal mine
A fire-proof, one-time technology, applied in drilling tools, drilling equipment, earthwork drilling and production, etc., can solve the problems of affecting grouting efficiency, affecting grouting, easy to be blocked, etc., to expand the grouting range, reduce the probability of plugging, The effect of improving grouting efficiency
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[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0023] As shown in the figure, a disposable telescopic drilling tool for fire prevention and grouting in coal mines includes a leading drill bit 10 and a rod body 20, the leading drill bit 10 is arranged at the end of the rod body 20, and the leading leading drill bit 10 is arranged at the end of the rod body 20. The drill bit 10 includes three wing plates 11, the connection of the wing plates 11 is a hollow design, and each wing plate 11 is arranged with a top cutting piece 12, a middle cutting piece 13 and a bottom cutting piece along one side from top to bottom. Sheet 14; the three top cutting sheets 12 located at the top of the leading drill bit 10 are rotated 15 degrees in the same direction along the sidelines of the three wing plates 11, and the projections on the plane perpendicular to the axis of the rod body 20 are partially overlapped; the rod body ...
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