FIELD: oil and gas industry.
SUBSTANCE: rock-drilling machine includes a body with ejector piston and cutting unit installed in it; at that the latter is made retractable from the body when ejector piston moves; at least one jet nozzle and flushing unit consisting of filter connected to the body of flushing unit that has operating channels and axial channel with landing saddle for a ball. Operating channels unite cavity between filter and the body of flushing unit with cavity over the piston in the body of rock-drilling machine. The body of flushing unit has radial channels connected to axial channel and united with tubular annulus by a circular groove at outside surface of the body of flushing unit and radial channels united with it and made in the body of rock-drilling machine and covering the body of flushing unit.
EFFECT: improvement of quality in process of rock-drilling machine washing, exclusion of impurities entrapped into the flushing channel and thus into structure of rock-drilling machine.
2 dwg
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