Abstract: A hydraulic fluid control system for controlling pressure fluid supplied to consumers (2, 3, 4) of a rock drilling machine, a regulating valve (6, 7, 8) for each for each consumer and fluid conduits between the regulating valves and the consumers, an electronically controlled auxiliary control unit (11) having an electrically controlled auxiliary valve (14) for connection to a fluid conduit, a sensor for sensing fluid parameter values and sending sensor signals to the auxiliary control unit as sensor input signal actual values, micro-controller (12) having at least one parameter sensor input signal entry (S1-S5, I1-I5) for receiving the sensor input signal actual values and a control signal exit (V1-V6) for signal control of an auxiliary valve, the processor (12) is being arranged to compare the actual and predetermined values and to emit control signals to an auxiliary valve in response to the comparison to adjust fluid flow.

Abstract: An arrangement in a rock drill rig 10 has an inlet valve 31 arranged upstream from a displacement compressor 32 that is used for supplying an air flow 34 to at least one flushing hole 23 in the surface of a drill bit 20. The rock drill rig 10 also has an air regulator 35 arranged to regulate the system pressure in the air flow path 34 downstream from the compressor and a detector for detecting air flow through the at least one flushing hole 23 in the surface of the drill bit. The detector has a pressure sensor 36, arranged between the air regulator 35 and the inlet valve 31, for measuring the reduced system pressure.

Abstract: A method and a device for controlling a drill rig (1) which includes a carrier vehicle with at least one feed-beam (3), wherein a drill machine (2) is movable to-and-fro, wherein rig parameters are set by a control unit (6) and wherein each one of a plurality of operating modes (M1-M6) includes specified operating settings for different operating parameters of the rig. Each operating mode (M1-M6) is selectable such that operation of the rig is related to a particular type of rock, in which drilling is to be performed, and each operating mode (M1-M6) includes operating settings that are adapted to the prevailing type of rock. The invention also concerns a drill rig.

Abstract: A hydraulic fluid control system (1) for the control of pressure fluid supply to consumers being a feed motor (2), a percussion device (4) and a rotation motor (3) of a rock drilling machine, said system including a regulating valve (6,7,8) for each one of the consumers (2,3,4), wherein fluid conduits lead between the regulating valves and the respective consumers, the system having: an electronically controlled auxiliary control unit (11) which includes at least one electrically controlled auxiliary valve (14) for the connection to and intercepting in at least one of the fluid conduits, at least one sensor for sensing prevailing fluid parameter values in at least one member of the rock drilling machine the and sending sensor signals to the auxiliary control unit as sensor input signal is-values, and a processor (12) having at least one parameter sensor input signal entry (S1-S5, I1-I5) for receiving said sensor input signal is-values and at least one control signal exit (V1-V6) for signal control of a res

Abstract: The present invention relates to an arrangement in a rock drill rig 10 comprising an inlet valve 31 arranged up-stream a displacement compressor 32 that is used for supplying an air flow 34 to at least one flushing hole 23 in the surface of a drill bit 20. The drill rig 10 further comprising an regulator 35 arranged to regulate the system pressure in the air flow path 34 downstream the compressor and means for detecting an flow of air through the at least one flushing hole 23 in the surface of the drill bit. The detecting means comprises a pressure sensor 36, arranged between the air regulator 35 and the inlet valve 31, adapted to measure the reduced system pressure.