Down-the-hole hammer reverse concentric casing drilling tool
A technology of drilling with pipe and reverse circulation, which is applied to drilling equipment, earthwork drilling, and driving devices for drilling in boreholes. It can solve the problems of reduced drilling efficiency, shortened life of drilling tools, and increased drilling costs. Avoid the erosion of the hole wall and the loss of flushing fluid, prevent the cuttings from getting stuck, and avoid repeated crushing effects
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[0021] The following is a further detailed description with reference to the drawings and embodiments:
[0022] DTH hammer reverse circulation concentric tube drilling tool is a hollow DTH hammer 1 connected to a pilot bit 3 through a semicircular clamp 2 and a spline sleeve 5. The pilot bit 3 is provided with an external spline 16 in the axial direction. It is matched with the inner spline 17 of the annular casing bit 12, the guide bit 3 is provided with a torsion transmission groove 14, the lower section of the guide bit 3 is provided with a bottom spray hole 9, and the lower end of the spline sleeve 5 is provided with a jet Nozzle 6, the bottom end of the central slag discharge channel 4 is provided with a diffuser groove 7, the bottom end of the guide bit 3 is provided with an anti-blocking boss 8, the annular casing bit 12 is suspended on the lower end of the casing 10 through a pipe shoe 11, The drill bit alloy 13 is inlaid on the bottom end surface of the ring-shaped casin...
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