ROCK DRILLING METHOD AND ROCK DRILLING MACHINE

摘要

A pulse drilling machine (1;1' ) for the generation of shock wave pulses in a tool direction (R) including a housing (2) wherein an impulse piston (4; 4') is arranged, and including means (9) for abrupt change of a fluid pressure influencing the impulse piston in order to achieve a force resultant on the impulse piston in the tool direction and thereby generate a shock wave pulse in a drill string (13; 13') which is connected to the machine, wherein inside the housing there is arranged a first fluid chamber (14;3' ) inside which a pressure fluid in operation is arranged to exert a pressure in the tool direction on the impulse piston. The machine is distinguished by a fluid flow channel (11; 18; 19), which includes means for damping a fluid flow flowing from said first fluid chamber through the fluid flow channel obtained when influencing the impulse piston (4; 4') in a direction opposite to the tool direction (R) by rock reflexes in the drill string during drilling.