Abstract: The disclosure relates to a changing device, rock drilling unit and a method of changing drill rods in rock drilling. The changing device includes a first drill rod station for receiving a second drill rod and a second drill rod station for receiving a third drill rod. The second drill rod station may be moved to the first drill rod station and the first drill rod station may be moved to drilling axis by moving the whole changing device in a transverse direction relative to a feed beam.

Abstract: A rock drill includes a frame, a percussion member, an axial shank, and an axial sleeve provided within the frame and including a first pressure surface provided in a first pressure space and a second pressure surface provided in a second pressure space. A first channel is provided in the axial sleeve for providing a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame. A second pressure channel connected to the second pressure space is connectable to external pressure. A pressure accumulator is connected to the first pressure space and the flow of the pressure medium outwards from the first pressure space is throttled.

Abstract: A rock drilling rig and method for rock drilling, the rock drilling rig having a first boom unit including a first rock drilling machine provided with a tool and drill bit at the distal end of the tool, and a second boom unit including at least one rack for accommodating at least one drill bit. The first boom unit and the first rock drilling machine therein are configured to collect a drill bit from the at least one rack in the second boom unit.

Abstract: An apparatus, rock drilling rig and method for rock drilling includes a turning device for moving a drilling tool around longitudinal axis of the tool. The turning movement is controlled by an alternating turning system so that direction of turning movement is continuously reversed to first and second turning directions. The turning angle of the tool is restricted and a safety system (is configured to monitor the operation and to ensure that a predetermined turning angle is not exceeded.

Abstract: A rotation unit includes a main shaft that is rotated around its longitudinal axis by a rotating motor. The main shaft includes a tubular outer shaft and an inner shaft arranged inside the outer shaft. The outer shaft is supported by a body of the rotation unit and is arranged to transmit axial forces, whereas the inner shaft is arranged to transmit rotation and torque. A rock drilling unit and method for rock drilling is also provided.

Abstract: A method for initiating a remote operation mode of a work machine, the method including providing the work machine with a work machine-specific safety key; receiving, at a remote control station, a notification from the work machine in response to initiating the remote operation mode of the work machine by said safety key; acknowledging the work machine as being included in a safety system of the remote control station; and configuring the remote control station to start the remote operation mode of the work machine.

Abstract: The invention relates to method for positioning a rock drilling rig and to a rock drilling rig. The rock drilling rig is moved using combustion-engine-free drive equipment with an electric drive motor. The torque is transmitted from the drive motor to the traction wheels over a mechanical anti-slip transmission connection. The ratio between the drive motor rotation rate and the traction wheel rotation rate is kept constantly the same during positioning. The drive motor is not only used for moving but also for stopping.

Abstract: A method for lubricating a drill shank of a rock drilling machine, wherein at least part of the flow of the pressure fluid of a hydraulic circuit of a device of the rock drilling machine performing at least one function is directed to the rotation mechanism of the drill shank for the purpose of lubricating the rotation mechanism of the drill shank.

Abstract: The invention relates to a percussion device having a frame, a tool mounted movable in its longitudinal direction, the percussion device containing a work chamber having a movably mounted transmission piston to compress the tool so that a longitudinal stress pulse is generated to the tool, inlet and outlet channels for conducting the pressure fluid to the percussion device and away from it and a control valve that alternately directs the pressure fluid from the inlet channel to the work chamber to act on the transmission piston and, correspondingly, discharges the pressure fluid from the percussion device. The percussion device and trans-mission piston have channels that connect the pressure fluid that acted on the transmission piston to flow during the return movement of the transmission piston through the control valve and transmission piston to the pressure fluid outlet channel and cut off the flow when the transmission piston has returned to its initial position.

Abstract: The invention relates to a sealing arrangement in a rotating control valve of a pressure fluid-operated percussion device, to which percussion device a tool is mountable movable in its longitudinal direction, the percussion device containing a work chamber and a transmission piston mounted movable to compress the tool suddenly to generate a stress pulse to the tool, inlet and outlet channels for conducting pressure fluid to the percussion device and away from it, and a control valve having a rotating switch member with channels to connect inlet and outlet channels through the channels of the switch member to alternately conduct the pressure fluid through the channels to the work chamber and, correspondingly, away from the work chamber, and in the inlet channel of the pressure fluid at the switch member side end thereof at least one sealing sleeve for the purpose of sealing the inlet channel to the switch member.

Abstract: Method and apparatus for controlling rock drilling with a percussion device belonging to a rock drill to deliver stress waves to rock through a tool by pushing the tool against the rock by means of a feed motor and rotating simultaneously the tool by means of a rotation motor, whereby the maximum feed force is determined, pressure medium is supplied to the feed motor and to the rotation motor and the feed force is controlled according to the drilling conditions. The feed force is controlled on the basis of the feed speed and the rotation torque. The apparatus has a load control valve which controls the feed.

Abstract: The invention relates to a method and apparatus for opening threaded joints of drilling equipment (6) by striking the drilling equipment (6) with the percussion device of a rock drilling rig (1) and by measuring vibration originating from the drilling equipment (6) during striking. In addition to vibration, measuring means (9) measure a parameter defining at least one additional condition, on the basis of which the decision to stop striking is made.

Abstract: The invention relates to a mining vehicle and method for its energy supply. The mining vehicle has a carriage, driving equipment for moving the carriage, and at least one mining work device. Further, the mining vehicle has at least one electric motor for operating a main function of the mining vehicle, and at least one electric motor for operating an auxiliary function of the mining vehicle. The mining vehicle further has a power-generating auxiliary unit. When necessary, the power-generating auxiliary unit supplies at least part of the power required by the electric motor operating the auxiliary function.

Abstract: A rock drilling rig and to a method for transmission thereof is provided. The rock drilling rig includes a carriage that is movable by drive equipment in a mine. The rock drilling rig includes a hydraulic drilling system for which pressure energy is generated by a hydraulic pump. The rock drilling rig is electrically driven and includes an electric motor that is connected to drive both the drive equipment and the hydraulic drilling system. The mechanical drive transmission included in the drive equipment and the hydraulic pump of the hydraulic drilling system may be connected and disconnected independently of one another by means of clutches.

Abstract: The present invention relates to a method for positioning a mobile mining vehicle, which method determines scanning data by scanning the environment of the mining vehicle while being driven. Location information is determined for the mining vehicle on the basis of the scanning data and prestored environment model data. Level information is associated with the environment model data, the location level of the mining vehicle (1) is determined and the environment model data to be used are selected on the basis of the determined location level.