FIELD: mining.
SUBSTANCE: boring bit for percussive drilling of rock comprises a front head and a tubular skirt stretching backwards from the head to the rear circular end, and having internal thread for transfer of combined impact and rotary movements to a boring bit. The head comprises an axisymmetric side surface with arranged washing grooves, which forms the largest outer diameter of the boring bit. The rear end of the skirt is connected via an inelastic joint with a front end of the bushing, having a side surface with multiple protruding ledges spaced along the periphery from each other, to direct the boring bit in the borehole deepened with the head.
EFFECT: improved rectilinearity of well boreholes, improved controllability, extended service life of a boring bit.
10 cl, 4 dwg
| Title | Year | Author | Number |
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RU2658184C2 |
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RU2687837C2 |
