Rock drilling and method of drilling

Abstract

 The invention relates to a rock drilling rig and method of drilling. The rock drilling rig (1) comprises a main hydraulic power pack (MHPP) and several hydraulic actuators connected to the hydraulic system. The rig further comprises an auxiliary hydraulic power pack (APP), which comprises a dedicated electrical power device (20) and a hydraulic pump (19) rotated by the power device. The auxiliary power pack in independently operable and may be arranged to produce hydraulic power for particular hydraulic actuators.

Description

Background of the invention

[0001] The invention relates to a rock drilling rig, which comprises one or more drilling booms provided with drilling units. The drilling unit comprises a drilling machine, which has hydraulic actuators. The rock drilling rig further comprises a hydraulic system for delivering needed hydraulic power to the hydraulic actuators.

[0002] The invention further relates to a drilling method wherein drill holes are drilled by means of a rock drilling rig comprising a carrier, and at least one drilling boom provided with at least one drilling unit. Hydraulic power is produced by means of at least one pump and the produced hydraulic power is conveyed to hydraulic drilling actuators comprising an impact device, a rotation device and a feed device.

[0003] The field of the invention is defined more specifically in the preambles of the independent claims.

[0004] In mines and at other work sites, rock drilling rigs provided with drilling units are used for drilling bore holes into rock surfaces and soil. The rock drilling rig comprises several hydraulic actuators and devices wherefore the rig is provided with a hydraulic system for producing the needed hydraulic energy. Known hydraulic systems of rock drilling rigs have some disadvantages.

Brief description of the invention

[0005] An object of the invention is to provide a novel and improved rock drilling rig and method of drilling.

[0006] The rock drilling rig according to the invention is characterized in that the hydraulic system comprises a main hydraulic power pack for supplying hydraulic power for the impact device and rotation device; the hydraulic system is further provided with at least one auxiliary hydraulic power pack; the auxiliary hydraulic power pack comprises at least one dedicated pump and at least one dedicated power device; the auxiliary hydraulic power pack is configured to supply hydraulic power to hydraulic actuators except for the impact device and the rotation device; and wherein the main hydraulic power pack and the auxiliary hydraulic power pack are electrically powered.

[0007] The method according to the invention is characterized by producing hydraulic power for the impact device and rotation device by means of an electrically powered main hydraulic power pack; producing additional hydraulic power to the hydraulic system by means of at least one auxiliary hydraulic power pack comprising at least one pump and at least one electrical power device; and utilizing the hydraulic power produced by the auxiliary hydraulic power pack for supplying hydraulic power for hydraulic actuators except for the impact device and the rotation device.

[0008] An idea of the disclosed solution is that a hydraulic system of a rock drilling rig comprises an electrically powered main hydraulic power pack for supplying hydraulic power for the impact device and rotation device. In addition to, the hydraulic system comprises one or more auxiliary hydraulic power packs. The auxiliary power pack is independently operable since it comprises one or more own hydraulic pumps and one or more own electrical power device. The auxiliary hydraulic power pack supplies hydraulic power to hydraulic actuators other than the impact device and the rotation device, which are powered by the main hydraulic power pack.

[0009] An advantage of the disclosed solution is that the auxiliary hydraulic power pack may be operated in a flexibly manner according to a need for hydraulic power in a rock drilling rig. The auxiliary power pack may be used independently of a main hydraulic power pack of a rock drilling rig. Further, the auxiliary power pack may be placed to a suitable place on a carrier of the rig, whereby it may be advantageous in situations when space on the carrier is limited and layout problems occur. The use of the auxiliary power pack may also make the hydraulic system of the rig simpler and may aid in saving energy.

[0010] According to an embodiment, the rock drilling rig is provided with one single auxiliary hydraulic power pack.

[0011] According to an embodiment, hydraulic power capacity of the auxiliary hydraulic power pack is dimensioned to be relatively small as compared to capacity of a main hydraulic power pack of the rock drilling rig. The auxiliary power pack may serve as an aid power source and it is arranged to provide hydraulic power for hydraulic actuators requiring relatively low fluid flow.

[0012] According to an embodiment, the auxiliary hydraulic power pack comprises a frame, fastening means and hydraulic coupling means so that the auxiliary power pack is a compact unit, which may be installed and detached fast and easily. The auxiliary power pack may then be easily changed or detached for service. It is also possible to update the hydraulic system by replacing a current device with an auxiliary power pack provided with desired capacity and other features.

[0013] According to an embodiment, the auxiliary hydraulic power pack comprises a pump with fixed displacement, which pump is rotated by means of an electric motor. The pump may be a centrifugal pump or a gear pump, for example. Rotating speed of the electric motor may be controlled by means of a control device, which may be a frequency converter, for example. Produced hydraulic power of the auxiliary power pack is adjusted by adjusting rotation speed of the pump.

[0014] According to an embodiment, the auxiliary hydraulic power pack comprises a pump the displacing capacity of which may be adjusted. By varying the displacement capacity of the pump produced hydraulic power of the auxiliary power pack may be adjusted.

[0015] According to an embodiment, the rock drilling rig is provided with an auxiliary hydraulic power pack, whose main purpose is to produce hydraulic power for a feed device of a drilling unit during drilling. The auxiliary power pack may additionally produce hydraulic power for hydraulic actuators relating control of a carrier and driving of the rig, for example.

[0016] According to an embodiment, the auxiliary hydraulic power pack is used for producing hydraulic power for one or more feed devices of one or more drilling units. The feed device of the drilling unit is provided with two speed settings slow feed and fast feed. The slow feed is used during drilling when rotation is on and the fast feed is used when the drilling is paused and rotation is off. The auxiliary hydraulic power pack provides the needed hydraulic power for the slow feed of the feed device. The fast feed may be powered by conveying hydraulic power produced from one or more rotation devices to the one or more feed devices. When the rotation is paused, then available hydraulic power capacity may be conveyed to the feed devices and utilized for producing the fast feed. A main hydraulic power pack of the rig may comprise one shared pump for producing the hydraulic power for all rotation devices. The hydraulic power produced for the rotation devices is conveyed to the feed device during the fast feed.

[0017] According to an embodiment, the auxiliary hydraulic power pack is arranged to produce hydraulic power for one or more feed devices of one or more drilling units. The hydraulic power of the auxiliary power pack may be used for executing feed of the drilling machine during drilling, i.e. a slow feed. The main hydraulic power pack may comprise one or more dedicated first hydraulic pumps for producing hydraulic power for one or more impact devices. When the drilling is stopped or paused, no percussion is needed and the available hydraulic power of the first pumps intended for producing hydraulic power for the impact devices may be used for executing a fast feed of the feed device. The fast feed is not performed when drilling is on.

[0018] According to an embodiment, the rock drilling rig comprises several booms and two or more drilling units. Thus, the rig also comprises several feed devices. The auxiliary hydraulic power pack may serve as a shared hydraulic power source for all feed devices of the rock drilling rig for providing a slow feed. The slow feed is executed during drilling when the drilling tool is rotated. During the drilling hydraulic power capacity of a main hydraulic system is used for executing percussion and rotation, wherefore it is advantageous to produce hydraulic power for the feed device during the drilling by means of the auxiliary power pack. During the drilling a carrier and booms of the rig are stopped and no hydraulic power needs to be conveyed to them, whereby the auxiliary power pack has available hydraulic capacity during the drilling for executing the slow feed.

[0019] According to an embodiment, the rock drilling rig is provided with a compressed air system comprising one or more compressors. Compressed air produced by the compressor may be used for flushing drill holes or it may serve as a pneumatic power for actuating one or more actuators. The compressor is driven by one or more hydraulic motors. The auxiliary hydraulic power pack disclosed in this patent application may be arranged to provide the needed hydraulic power for driving the hydraulic motor of the compressor.

[0020] According to an embodiment, the rock drilling rig is provided with a flushing system comprising one or more flushing pumps for producing a flushing flow of water or corresponding flushing liquid. The flushing fluid flow may be fed to drill holes during drilling in order to flush drilling cuttings. The flushing pump may be driven by means of one or more hydraulic motors. The auxiliary hydraulic power pack disclosed in this patent application may be arranged to provide the needed hydraulic power for at least one flushing pump for producing flow of a flushing fluid.

[0021] According to an embodiment the rock drilling rig is electrically powered. The rock drilling rig may be connected to an electrical network of a mine or corresponding external electrical supply system for providing the rig with needed power. Alternatively, or in addition to, the rock drilling rig may comprise one or more electrical energy storages, such as batteries, for storing electrical energy. The electrical energy discharged from the energy storage may be utilized in transfer drives and for performing drilling and other work tasks of the rock drilling rig.

[0022] According to an embodiment the rock drilling rig comprises at least one electric motor for performing transfer drives and moving the rig. The electric motor may be part of driving equipment. The driving equipment may comprise an electromechanical transmission, in which the drive power is generated with an electric motor.

[0023] According to an embodiment, the rock drilling rig is electrically powered and comprises one single electric drive motor for performing driving of the rig. The drive motor is configured to drive all hydraulic pumps of a main power pack of the rig. Between the drive motor and the pumps may be a transmission unit for transmitting the power to the hydraulic pumps. The transmission unit may comprise a mechanical transmission, such as a gear box. Thanks to this embodiment, only one single motor is need for powering the main hydraulic power pack and a driving system. Thus, amount of motors on a carrier may be minimized, whereby less space is needed and the disclosed system may also aid achieving cost savings.

[0024] According to an embodiment, the rock drilling rig is electrically powered and is provided with a drive system comprising an electrical drive motor. The auxiliary hydraulic power pack disclosed in this patent application is arranged to produce needed hydraulic power to at least one hydraulic driving aid actuator of the drive system. Thus, the auxiliary hydraulic power pack may be utilized for producing the needed hydraulic power during transfer drives. This is beneficial especially in a system where pumps of a main hydraulic power pack are driven by means of the electrical drive motor. In such a case all power of the electrical drive motor may be directed to a driving system of the rig. The auxiliary power pack ensures that sufficient hydraulic power is always available for the hydraulic driving aid actuators, such as hydraulic brakes and steering cylinders. When the rig is driven with a slow speed, the driving motor also rotates with a slow speed. If the main hydraulic power pack is driven by means of the drive motor, no adequate hydraulic fluid flow could be produced during low speed for driving the aid actuators.

[0025] According to an embodiment, the hydraulic driving aid actuator is a steering actuator. The steering actuator may be a hydraulic steering cylinder or motor arranged to turn wheels of a carrier, or alternatively is arranged to turn front and rear body of the carrier relative to each other when the carrier is provided with an articulated steering system. The hydraulic steering system may also comprise needed power steering equipment.

[0026] According to an embodiment, the hydraulic driving aid actuator is a braking actuator. The disclosed auxiliary power pack may be used to produce needed hydraulic power to charge one or more hydraulic accumulators of a hydraulic brake system so that the rock drilling rig may be stopped safely in all situations. The braking system may comprise operational braking actuators and parking brake actuators in connection with wheels.

[0027] According to an embodiment, carrier of the rock drilling rig is driven by means of an electrical drive motor, which also drives at least one pump of the main hydraulic power pack. Hydraulic power produced by the auxiliary hydraulic power pack is utilized for operating at least one hydraulic steering actuator and at least one hydraulic braking actuator during the drive executed by means of the electrical drive motor.

[0028] According to an embodiment, the auxiliary hydraulic power pack is arranged to produce hydraulic power for one or more boom actuators for moving the boom during a transfer drive of the carrier. The boom actuators may be powered by the hydraulic power of the auxiliary power pack also in other situations too, if needed. The boom actuator may be a hydraulic cylinder, or alternatively it may be hydraulic motor. During the transfer drive the auxiliary power pack has hydraulic power capacity free since no drilling measures are performed, wherefore the free hydraulic power may be utilized to perform needed boom movements.

[0029] According to an embodiment, the rock drilling rig is electrically powered. Electrical energy is supplied from an external electric network by means of a cable, which may be wound on a rotatable cable drum. The auxiliary hydraulic power pack is arranged to produce hydraulic power for a cable drum actuator for rotating the cable drum during a transfer drive or whenever needed. If the rig is provided with any other type reel or rotating drum for handling hoses, for example, the auxiliary power pack may also provide hydraulic power for such a reel system.

[0030] According to an embodiment, the rock drilling rig comprises two or more drilling units, which are provided with impact or percussion devices. The main hydraulic power pack is provided with several first pumps for providing hydraulic energy for the impact devices. The number of the first pumps corresponds to the number of the impact devices, whereby each of the first pumps is dedicated to produce hydraulic power for only one impact device. Further, the main hydraulic power pack may be provided with one second pump arranged to produce hydraulic power, which is shared with all rotation devices of the rock drilling rig. The auxiliary hydraulic power pack is arranged to produce hydraulic power, which is shared with all feed devices of the rock drilling rig.

[0031] According to an embodiment, the rock drilling rig is electrically powered. A drive system of the rig comprises an electrical drive motor. In addition to produce the needed driving force, the electrical drive motor is also arranged to drive all the hydraulic pumps of a main hydraulic power pack. Thus the electrical drive motor produces rotation for one or more first pumps producing hydraulic power for percussion devices and for one or more second pumps producing hydraulic power for rotation devices.

[0032] The above-disclosed embodiments can be combined to form suitable solutions provided with necessary features disclosed.

Brief description of the figures

[0033] Some embodiments are described in more detail in the accompanying drawings, in which

Figure 1 is a side view of a rock drilling rig provided with several booms,

Figure 2 shows schematically an auxiliary hydraulic power pack, which is arranged to produce hydraulic power to drilling work devices and to auxiliary devices of a driving system,

Figure 3 is a schematic and greatly simplified view of a hydraulic system of a rock drilling rig, which comprises a main hydraulic power pack and an auxiliary hydraulic power pack, and

Figure 4 is a schematic and greatly simplified view of a hydraulic system of a rock drilling rig, which rig comprises several drilling units.

[0034] For the sake of clarity, the figures show some embodiments of the disclosed solution in a simplified manner. In the figures, like reference numerals identify like elements.

Detailed description of some embodiments

[0035] Figure 1 shows a rock drilling rig 1 equipped with several drilling booms 2. The rock drilling rig 1 further comprises a carriage 3 that may be moved by means of drive equipment 4. The drive equipment 4 comprises one or more drive motors 5 and one or more power transmission means 6 for transmitting drive power to one or more wheels 7. The drive power transmission may comprise a mechanical gear system and mechanical power transmission members or, alternatively, the drive power transmission may be hydraulic or electric. The drilling booms 2 are provided with rock drilling units 8. The number of the drilling booms and drilling units may be one, two, three or even greater. It is also possible that the rock drilling rig 1 comprises one or more drilling units and one or more alternative mining work devices, such as a bolting device or an injection device.

[0036] The rock drilling rig 1 of Figure 1 comprises three rock drilling units 8 connected to drilling booms 2. The drilling unit 8 may comprise a feed beam 9 and a rock drilling machine 10 supported on it. The rock drilling machine 10 may be moved on the feed beam 9 by means of a feed device 11. At a front end of the rock drilling machine 10 may be a shank for connecting a drilling tool 12. The tool 12 may be rotated by means of a rotating device 13. The rock drilling machine 10 may also comprise an impact device 14 for generating impact pulses to the tool 12.

[0037] At a drilling site, one or more drill holes are drilled with the drilling unit 8. The drill holes may be drilled in a horizontal direction, as is shown in Figure 1, or alternatively, in a vertical direction or in a desired angular direction. The drill holes may be drilled to a rock material or soil.

[0038] Figure 1 further shows that the rock drilling rig 1 is electrically powered. A mine or construction site, where the rock drilling rig operates, may be provided with an electrical network 15. The rock drilling rig 1 may be connected to the electrical network 15 with one or more connection cables 16. The connection cable 16 may be arranged on a reel or cable drum 17, which may be rotated by means of a cable drum actuator. Alternatively, or in addition to, the rock drilling rig 1 may be equipped with one or more energy storages 18, from which electric current may be discharged and which may correspondingly be charged with electric current. The energy storage 18 may be a battery, capacitor, or the like. The rock drilling rig 1 may have a charging apparatus, with which the energy storage 18 may be charged by electricity from the electrical network 15. Thus, electrical supply of the rock drilling rig 1 may be based on the battery or the cable.

[0039] The rock drilling rig 1 comprises a main hydraulic power pack MHPP for producing and delivering hydraulic power for hydraulic actuators of the rig 1. The main hydraulic power pack MHPP comprises one or more hydraulic pumps which may be driven by one common power device. Thus, the hydraulic pumps may be driven by means of the drive motor 5 of the drive system 4 when the rock drilling rig 1 is electrically powered. In addition to the main hydraulic power pack MHPP, the rock drilling rig 1 comprises one or more auxiliary hydraulic power packs APP for producing assisting hydraulic power for driving particular hydraulic devices of the rig 1. The auxiliary hydraulic power pack APP may operate independently since it comprises a hydraulic pump and power device of its own. The auxiliary power pack APP may be positioned relatively freely on the carrier 3, which facilitates layout design of the rig 1.

[0040] Figure 2 shows an auxiliary hydraulic power pack APP, which may be a compact module. The auxiliary power pack APP comprises a dedicated hydraulic pump 19, which is driven by a dedicated power device 20. The power device 20 may be an electrical motor. Produced hydraulic power of the hydraulic pump 19 may be adjusted. Displacement capacity of the pump 19 may be adjusted in order to affect the produced hydraulic power. Alternatively, the pump 19 may be a pump with fixed displacement, whereby the produced hydraulic power may be adjusted by varying rotation speed of the pump 19. One or more control elements or devices 21 may be arranged to control the operation and the produced hydraulic fluid flows.

[0041] The auxiliary power pack APP may be arranged to provide hydraulic power to a drilling system DS and to auxiliary devices AD. The auxiliary power pack APP may be arranged to produce power for one or more desired hydraulic devices of the drilling system DS. The auxiliary hydraulic power pack APP may provide the needed hydraulic power for a feed device 11 of a drilling unit 8 during drilling. The auxiliary power pack APP may also be arranged to produce needed hydraulic fluid flow for boom actuators 22. The auxiliary devices AD may relate to controlling of a carrier of the rock drilling rig. Thus, the auxiliary devices AD may be hydraulic driving aid actuators such as a braking actuator 23 and a steering actuator 24. Hydraulic fluid flow may be conveyed from the auxiliary power pack APP to a braking system for pressurizing operational and parking brakes, and to the steering system for pressurizing steering cylinders and a power steering system. Thus, the auxiliary hydraulic power pack APP may always provide sufficient hydraulic power for the auxiliary devices so that their operation is ensured in all circumstances.

[0042] Figure 3 discloses a hydraulic system of a rock drilling rig in a greatly simplified manner. The hydraulic system comprises a main hydraulic power pack MHPP and an auxiliary hydraulic power pack APP. The auxiliary power pack APP may correspond to the one disclosed in Figure 2. However, in addition to the braking actuator 23 and the steering actuator 24, the auxiliary devices AD may comprise a cable drum actuator 17 for rotating and braking rotation of a cable drum or corresponding drum. The auxiliary power pack APP may also produce hydraulic fluid flow for one or more boom actuators 22 and for a feed device 11 a for executing a slow feed during drilling.

[0043] The main hydraulic power pack MHPP comprises a first hydraulic pump 25 for producing hydraulic power for an impact device 14. A second hydraulic pump 26 is arranged to produce hydraulic power for a rotation device 13. The second pump 26 may also feed pressure fluid to a feed device 11 b when fast feed is executed. During drilling rotation device 13 powered by the second pump 26 is on and also slow feed powered by the auxiliary power pack APP is on. When the drilling is stopped or paused, then the rotation device 13 is also stopped and no hydraulic power is needed for the rotation device 13. Then the available hydraulic fluid flow produced by the second pump 26 may be utilized to produce the fast feed 11 b. The main hydraulic power pack MHPP may comprise only one first pump 25 and one second pump 26 when the rock drilling rig comprises one drilling unit 8. If the rig is provided with two or more drilling units 8, number of the first pumps 25 is in accordance with the number of the drilling units 8. However, the second pump 26 may provide needed hydraulic power for one or more rotation devices, in other words, the second pump 26 is shared with all rotation devices 13 of the rig. Produced hydraulic power of the first pump 25 and the second pump 26 may be adjusted. Displacement capacities of the pumps 25 and 26 may be adjusted in order to affect the produced hydraulic power of the pumps.

[0044] The first pump 25 and the second pump 26 may be driven by means of one shared power unit, which may be a drive motor 5 of the rig. The drive motor 5 may be connected to a transmission box 27 by means of an input shaft 28. The first pump 25 and the second pump 26 may be rotated by means of a first output shaft 29 of the transmission box and a second output shaft 30 may transmit torque through drive transmission means 6 to wheels 7.

[0045] Figure 4 discloses a hydraulic system of rock drilling rig having several drilling booms and drilling units 8a, 8b. The auxiliary hydraulic power pack APP may be similar to the one shown in Figure 3. However, the auxiliary power pack APP may also provide hydraulic power for a flushing fluid pump 32, such as a water pump, and for a compressor 33. The main hydraulic power pack MHPP is also substantially similar to the solution shown in Figure 3. However, the system comprises two first pumps 25a, 25b because the rig has two drilling units 8a, 8b, both of them having impact devices. The first pumps 25a, 25b may be arranged to be rotated by a first output shaft 29. A second pump 26 may rotated by means of a third output shaft 31 and the second pump 26 may provide hydraulic power for all rotation devices of the drilling units 8a, 8b. If the rig comprises a third drilling unit 8c, a third first pump 25c may be arranged to be rotated by the third output shaft 31, or alternatively it may be connected to the first output shaft 29.

[0046] In Figures 3 and 4 valves, valve blocks or other suitable control elements 34 allowing control of produced fluid flows are also shown in a greatly simplified manner.

[0047] Figure 3 also shows an alternative solution, wherein hydraulic fluid flow for providing the fast feed 11 b of the feed device 11 is produced by means of the first pump 25 instead of the second pump 26. An alternative pressure medium duct 35 is shown in Figure 3 for illustrating this embodiment. When drilling is paused, the impact device is also paused. Thus, available hydraulic power capacity of the first pump 25 may be used for executing the fast feed 11 b. The fast feed 11 b is needed only when the drilling is off or paused.

[0048] The drawings and the related description are only intended to illustrate the idea of the invention. In its details, the invention may vary within the scope of the claims.

Claims

1. A rock drilling rig comprising:

a carrier (3);

at least one drilling boom (2) arranged on the carrier (3);

at least one drilling unit (8), which is located at a distal end of the drilling boom (2), and wherein the drilling unit (8) comprises a drilling machine (10) provided with a hydraulic impact device (14) and a hydraulic rotation device (13), and the drilling unit (8) further comprises a hydraulic feed device (11) for feeding the rock drilling machine (10);

at least one boom actuator (22) for moving the drilling boom (2) relative to the carrier (3);

a hydraulic system for supplying hydraulic power to the hydraulic actuators;

and wherein the hydraulic system comprises at least one pump for producing the hydraulic power, at least one power device for driving the pump, pressure medium ducts for conveying hydraulic fluid and control means for affecting delivery of the hydraulic fluid;

characterized in that

the hydraulic system comprises a main hydraulic power pack (MHPP) for supplying hydraulic power for the impact device (14) and rotation device (13);

the hydraulic system is further provided with at least one auxiliary hydraulic power pack (APP);

the auxiliary hydraulic power pack (APP) comprises at least one dedicated pump (20) and at least one dedicated power device (19);

the auxiliary hydraulic power pack (APP) is configured to supply hydraulic power to hydraulic actuators except for the impact device (14) and the rotation device (13); and

wherein the main hydraulic power pack (MHPP) and the auxiliary hydraulic power pack (APP) are electrically powered.

2. The rock drilling rig as claimed in claim 1, characterized in that
the auxiliary hydraulic power pack (APP) is arranged to produce the hydraulic power for the feed device (11).

3. The rock drilling rig as claimed in claim 2, characterized in that
the feed device (11) is provided with two speed settings slow feed (11 a) and fast feed (11 b), wherein the slow feed (11 a) is used during drilling when rotation is on and the fast feed (11 b) is used when the drilling is paused and rotation is off;
the auxiliary hydraulic power pack (APP) provides the needed hydraulic power for the slow feed (11 a) of the feed device (11);
the hydraulic system comprises one shared pump (26) for producing the hydraulic power for all rotation devices (13); and
the hydraulic power produced for the rotation devices (13) is conveyed to the feed device (11) during the fast feed (11 b).

4. The rock drilling rig as claimed in claim 3, characterized in that
the rock drilling rig (1) comprises at least two booms (2) and at least two drilling units (8a, 8b); and
the auxiliary hydraulic power pack (APP) serves as a shared hydraulic power source for all feed devices (11) of the rock drilling rig (1) for executing the slow feed (11 a).

5. The rock drilling rig as claimed in any one of the preceding claims 1 to 4, characterized in that
the auxiliary hydraulic power pack (APP) provides the hydraulic power for at least one compressor (33).

6. The rock drilling rig as claimed in any one of the preceding claims 1 to 5, characterized in that
the auxiliary hydraulic power pack (APP) provides the hydraulic power for at least one flushing pump (32) for producing flow of a flushing fluid.

7. The rock drilling rig as claimed in any one of the preceding claims 1 to 6, characterized in that
the rock drilling rig (1) is electrically powered and is provided with an drive system comprising an electrical drive motor; and
the auxiliary hydraulic power pack (APP) is arranged to produce the hydraulic power to at least one hydraulic driving aid actuator of the drive system.

8. The rock drilling rig as claimed in claim 7, characterized in that
the hydraulic driving aid actuator is a steering actuator (24).

9. The rock drilling rig as claimed in claim 7 or 8, characterized in that
the hydraulic driving aid actuator is a braking actuator (23).

10. The rock drilling rig as claimed in any one of the preceding claims 7 to 9, characterized in that
the auxiliary hydraulic power pack (APP) is arranged to produce the hydraulic power for the boom actuator (22) for moving the boom (2) at least during a transfer drive of the carrier (3).

11. The rock drilling rig as claimed in any one of the preceding claims 7 to 10, characterized in that
the auxiliary hydraulic power pack (APP) is arranged to produce the hydraulic power to a cable drum actuator (17) for rotating the cable drum.

12. The rock drilling rig as claimed in any one of the preceding claims 1 to 11, characterized in that
the rock drilling rig (1) comprises at least two booms (2) and at least two drilling units (8a - 8c);
the main hydraulic power pack (MHPP) is provided with several first pumps (25a - 25c), the number of the first pumps corresponds to the number of the impact devices (14), whereby each of the first pumps (25a - 25c) is dedicated to produce hydraulic power for only one impact device (14);
the main hydraulic power pack (MHPP) is provided with one second pump (26) arranged to produce hydraulic power, which is shared with all rotation devices (13) of the rock drilling rig (1); and
the auxiliary hydraulic power pack (APP) is arranged to produce hydraulic power, which is shared with all feed devices (11) of the rock drilling rig (1).

13. The rock drilling rig as claimed in claim 12, characterized in that
the rock drilling rig (1) is electrically powered and provided with a drive system comprising an electrical drive motor; and
the electrical drive motor is arranged to drive all the first pumps (25a - 25c) and the second pump (26) of the main hydraulic power pack (MHPP).

14. A method of drilling, the method comprising:

drilling drill holes by means of a rock drilling rig (1) comprising a carrier (3), and at least one drilling boom (2) provided with at least one drilling unit (8); and

producing hydraulic power by means of at least one pump (25, 26) and conveying the produced hydraulic power to hydraulic drilling actuators comprising an impact device (14), a rotation device (13), and a feed device (11);

characterized by

producing hydraulic power for the impact device (14) and rotation device (13) by means of an electrically powered main hydraulic power pack (MHPP);

producing additional hydraulic power to the hydraulic system by means of at least one auxiliary hydraulic power pack (APP) comprising at least one pump (19) and at least one electrical power device (20); and

utilizing the hydraulic power produced by the auxiliary hydraulic power pack (APP) for supplying hydraulic power for hydraulic actuators except for the impact device (14) and the rotation device (13).

15. The method according to claim 14, characterized by driving the carrier (3) by means of an electrical drive motor (5); driving the at least one pump (25, 26) of the main hydraulic power pack (MHPP) by means of the electrical drive motor (5); and
utilizing the hydraulic power produced by the auxiliary hydraulic power pack (APP) for operating at least one hydraulic steering actuator (24)
and at least one hydraulic braking actuator (23) during the drive executed by means of the electrical drive motor (5).

Drawing