| 摘要 |
A method for controlling a fluid operated percussive device, which inside an axially extending cylinder room (3) of a housing (2) of the percussive d evice includes a to and fro moveable percussive piston (1), which is adapted for performing strikes in a striking direction (A) and which includes a sig nal portion (4) for controlling a main valve (5), which is adapted to interm ittently transmit pressure fluid to at least one driving chamber (7) for the percussive piston. An auxiliary valve (9) is controlled for transmitting fl uid contact between at least one auxiliary channel means (13,14) with a chan nel opening in the cylinder room (3), and the main valve (5) over the signal portion (4), for switching the main valve (5) before the percussive piston, in operation, has reached at least one of said regions. The invention also concerns a percussive device and a rock drilling machine. |
