Abstract: An impulse generator (1) for a percussive tool includes a chamber (3) for receiving a liquid volume and an impulse piston (4) which is arranged for transferring pressure pulses in the liquid volume into stress wave pulses in the tool. The chamber (3) is adapted with respect to its shape such that it forms a resonance chamber for liquid in the liquid volume for forming at least one pressure antinode (11,15,17) inside the chamber. The invention also concerns a method and a hydraulic impulse tool.

Abstract: A pulse drilling machine (1;1?) for the generating of shock wave pulses in a tool direction (R) has an impulse piston (4;4?) with a housing (2), and a device (8) for abruptly changing fluid pressure influencing the impulse piston to achieve a force resultant on the impulse piston in the tool direction to generate a shock wave pulse in a drill string (13; 13?) which is connected to the machine, a first fluid chamber (14;3?) inside the housing which in operation is arranged to exert a pressure in the tool direction on the impulse piston. The machine has a fluid flow channel (11; 18; 19), which includes a device for damping fluid flow flowing from the 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.

Abstract: Device (34) for separating particles and/or drops of solid/fluid material out of a fluid, which device has a cyclone (14) with an inlet (16) and an outlet (28). The device also has a centrifuge (36) that is arranged to separate particles and/or drops of solid/fluid material from the outlet fluid in the cyclone (14). The centrifuge (36) is located downstream of the cyclone (14) and is located in the cyclone (14). The centrifuge's axis of rotation is arranged to extend in the same direction as the cyclone's axis of rotation. The centrifuge (25) has a plurality of lamellae (40) that is arranged coaxially on a shaft (42) at a distance from one another so that fluid channels are formed between adjacent lamellae (40) and so that fluid flows in between adjacent lamellae (40) in a direction from the lamellae's periphery (40p) towards the shaft (42) when the centrifuge (36) is in use.

Abstract: A method for producing Shockwave pulses in a tool direction (R) of a pulse machine (1) having a housing (2), wherein an impulse piston (4) is arranged, wherein the impulse piston is influenced by a first force in a direction opposite to said tool direction through a first fluid pressure (Pi) in a first chamber (7), and by a second force in said tool direction, wherein 'a Shockwave pulse is produced through a rapid relief of the first fluid pressure after displacement of the impulse piston (4) relative to the housing in a direction opposite to the tool direction, is distinguished in that the length of the shock wave is controlled by the length (L) of said displacement is regulated. The invention also concerns a device, rock drilling machine and a rock drilling rig.

Abstract: A method for producing Shockwave pulses in a tool direction (R) of a pulse machine (1) having a housing (2), wherein an impulse piston (4) is arranged, wherein the impulse piston is influenced by a first force in a direction opposite to said tool direction through a first fluid pressure (Pi) in a first chamber (7), and by a second force in said tool direction, wherein a Shockwave pulse is produced through a rapid relief of the first fluid pressure after displacement of the impulse piston (4) relative to the housing in a direction opposite to the tool direction, is distinguished in that the length of the shock wave is controlled by the length (L) of said displacement is regulated. The invention also concerns a device, rock drilling machine and a rock drilling rig.

Abstract: Device (34) for separating particles and/or drops of solid/fluid material out of a fluid, which device comprises a cyclone (14) with an inlet (16) and an outlet (28). The device comprises a centrifuge (36) that is arranged to separate particles and/or drops of solid/fluid material from the outlet fluid in said cyclone (14). The centrifuge (36) is located downstream of the cyclone (14) and is located in the cyclone (14). The centrifuge's axis of rotation is arranged to extend in the same direction as the cyclones axis of rotation and that the centrifuge (25) comprises a plurality of lamellae (40) that is arranged coaxially on a shaft (42) at a distance from one another so that fluid channels are formed between adjacent lamellae (40) and so that fluid flows in between adjacent lamellae (40) in a direction from the lamellae's periphery (4Op) towards said shaft (42) when said centrifuge (36) is in use.

Abstract: 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.

Abstract: According to one aspect of the invention hydraulic pressure pulses are created in a rock drill machine utilizing a rod (7, 7a, 7b) made of a magnetostrictive material arranged in one or more actuators (5, 5a, 5b), which exposes an impulse piston (3) in a pulse cylinder (1) to said hydraulic pressure pulses, whereby mechanical pressure pulses being transferred to a drill steel of the rock drill machine are generated in the impulse piston (3).