WO2025234902A1

WO2025234902A1 - Rock drilling rig configured for purging a filter of a dust collector

Info

Publication number: WO2025234902A1
Application number: PCT/SE2024/050440
Authority: WO
Inventors: Erik AHLSTRÖM
Original assignee: Epiroc Rock Drills AB
Current assignee: Epiroc Rock Drills AB
Priority date: 2024-05-08
Filing date: 2024-05-08
Publication date: 2025-11-13
Anticipated expiration: 2026-11-08

Abstract

The present disclosure relates to a drill rig (100) comprising: a movable carrier (101); a boom (102) configured to carry a drill tool, the boom (102) attaching the drill tool to the movable carrier (101); a first compressor (411) configured to discharge a first flow of compressed air, the first flow of compressed air being utilised for flushing drill residues out of a drill hole during drilling; a first power source (110; 410) for powering the first compressor (411); a dust collector (115) for collecting drill residues being flushed out of a drill hole, the dust collector (115) comprising at least one filter; a second compressor (451) for discharging a second flow of compressed air, the second flow of compressed air being utilised to purge the filter of the dust collector (115); a second power source (450), being separate from the first power source (110; 410), for powering the second compressor (451) The disclosure also relates to a corresponding method.

Description

ROCK DRILLING RIG CONFIGURED FOR PURGING A FILTER OF A DUST COLLECTOR

Technical Field

The disclosure relates in particular to mining and construction, and more specifically to a drill rig being configured for purging a filter of a dust collector. The disclosure also relates to a computer program, a computer-readable medium and a method.

Background

Rock excavation, such as in mining, tunnelling and construction may be carried out using various techniques, where, e.g., excavation using drilling and subsequent blasting technology is a commonly used method.

Various different machines may be utilised in rock excavation, and in particular with regard to surface drilling, a mobile surface drill rig is oftentimes used to carry out drilling, where the surface drill rig may comprise a carrier and a boom attaching work equipment, such as a drilling machine, to the carrier.

The drilling machine may be utilised to break the rock during drilling, whereby drilling residues, drill remnants, are formed and which must be evacuated from the drill hole in order to perform the drilling in an efficient manner. This may be performed through the aid of a flushing medium, which oftentimes at least in part comprises compressed air, and where the flushing medium may be led through a channel in the drill string for release through, or in the vicinity of, a drill bit to transport drill cuttings on the way up through the hole.

It may not be desirable to allow the evacuated drill cuttings to spread freely in the surroundings of the machine, and a dust collection technique, or system, may therefore be used to collect drilling residues that have been flushed out of the drill hole, e.g. through suction. Such dust collection systems may comprise one or more filters, which from time to time may need to be purged, i.e. , cleaned, where this may be accomplished through purging where compressed air is applied to the filter in a direction opposite to the direction of evacuation of the drill remnants.

Summary An object of the disclosure is to provide a drill rig being configured to provide for a drill rig that allows purging of the one or more filters of a dust collector in a more energy efficient manner. A further object of the disclosure is to provide for a more energy efficient compressor use for other purposes.

According to an aspect of the disclosure, it is provided a drill rig comprising: a movable carrier; a boom configured to carry a drill tool, the boom attaching the drill tool to the movable carrier; a first compressor configured to discharge a first flow of compressed air, the first flow of compressed air being utilised for flushing drill residues out of a drill hole during drilling; a first power source for powering the first compressor; a dust collector for collecting drill residues being flushed out of a drill hole, the dust collector comprising at least one filter; a second compressor for discharging a second flow of compressed air, the second flow of compressed air being utilised to purge the filter of the dust collector; a second power source, being separate from the first power source, for powering the second compressor.

As was mentioned above, a dust collector may be utilised to collect drilling residues that have been flushed out of a drill hole, where the drilling residues may be flushed out of a hole during ongoing drilling using a flushing medium, and where the drilling residues may be collected, e.g., through suction. Dust collection of this kind utilises, as was also mentioned, one or more filters, which may become clogged during suction, thereby reducing the efficiency of the dust collection by preventing suction air from passing through the filter. The filters may therefore be cleaned, where this may be carried out by directing gusts of compressed air towards the filters in a direction opposite to the direction of evacuation to thereby blow away material such as dust that clog the one or more filters of the dust collector. In this way, the suction air stream may again more easily pass through the one or more filters until they again become clogged, and thereby again needs to be purged. Historically, this has been carried out using compressed air emanating from a main, principal, compressor that also provides compressed air for being used as flushing medium. A portion of the compressed air stream generated by the main compressor for the purpose of providing a flushing medium for flushing the drill remnants out of the hole may then be diverted for use as purging air for cleaning the one or more filters of the dust collector, and the main compressor is also used in situations where the one or more filters of the dust collector are purged in situations when drilling is not ongoing.

According to the present disclosure, it is provided a solution that may reduce the power consumption when purging the one or more filters of the dust collector in certain situations. According to the disclosure, this is accomplished by a drill rig where the main compressor, also denoted first compressor, is configured to discharge a first flow of compressed air, where the first flow of compressed air is utilised for flushing drill residues out of a drill hole during drilling, i.e. , as described above. The first compressor is powered by a first power source, which is also in general the case, and where this first power source may be the main power source of the drill rig, hence providing the principal power being utilised in the drilling process, e.g., powering the drilling machine being used in the drilling, the compressor, as well as various other equipment of the drill rig.

In addition to the first, or main, compressor, the drill rig comprises, according to the disclosure, a second compressor for discharging a second flow of compressed air, where this second flow of compressed air is used to purge the filter of the dust collector, in particular in certain situations. The second compressor is powered by a second power source, being separate from the first power source, for powering the second compressor.

Hence, when drilling is ongoing, airflow from the larger compressor may be utilised for purging purposes, as the first, main, power source and the first, larger main compressor are already in operation, and the diversion of part of the air flow discharged by the first compressor can be carried out without essentially affecting the power consumption of the drill rig. When, on the other hand, drilling is not ongoing, purging may instead be carried out utilising the second, smaller, compressor that is not capable of providing a desired flushing medium flow. Since this compressor is not powered by the main power source, but a power source that can be considerably smaller, energy can be saved in such situations. The main power source, and main compressor thereby need not be taken into operation when purging the filters of the dust collection system in a situation where the main power source and main compressor otherwise would remain inoperative. Instead, it is made possible to use a power source and compressor that are of considerable smaller dimensions than the main power source and main compressor that need to be designed for maximum power being utilised during drilling. Thereby considerable energy savings may be obtained.

Since the second compressor is powered by a power source being separate from the first power source, the second power source may also have a completely different power rating than the main power source, i.e. , have a much lower power output.

According to aspects of the disclosure, the second power source and second compressor form an integrated entity. This provides a solution where the power being consumed when purging filters may be considerably reduced, in particular in situations where the first (main) compressor, and first (main) power source, is idle, since in this case only the smaller power source and compressor need to be set in operation. This also provides for a design efficient solution.

According to aspects of the disclosure, the first and the second power sources are configured to be operated independently from each other. This provides for a solution where the airflow discharged by a larger compressor may be used during drilling, where the larger compressor may provide for high-power requiring tasks such as flushing drill residues out of a drill hole during drilling. The second compressor may be utilised to provide an airflow for tasks that require lower air flows, in particular for purging filters of the dust collector, when the main compressor is not in operation, and where hence the main power source also need not be in operation.

According to aspects of the disclosure, the flow of compressed air of the first, main, compressor is configured to charge a first air tank, where the flushing of drill residues from a drill hole during drilling is configured to utilise compressed air from the first air tank, and where part of the flow of compressed air being discharged by the first compressor is configured to, during drilling, be utilised to purge the at least one filter of the dust collector. Hence, the main compressor may be utilised in the same manner has it historically has been used during drilling, but where an alternative solution is used for other situations.

According to aspects of the disclosure, the drill rig is configured to utilise the second flow of compressed air to purge the at least one filter of the dust collector when the first compressor is not in operation. Hence, the smaller compressor can be utilised whenever the larger compressor is not in operation to thereby save energy.

According to aspects of the disclosure, the second flow of the second compressor is configured to charge a second air tank, wherein compressed air of the second air tank is utilised to purge the at least one filter of the dust collector. Hence, the first and second compressors may be configured to charge separate air tanks, where the air tank charged by the first compressor may have a considerably higher capacity in comparison to the second air tank, since the amounts of air required for purging are much smaller than the amounts of air required for flushing.

The second compressor may be configured to charge the second air tank only when the first compressor is not in operation, since, as was mentioned, it may be energy efficient to use the first compressor over the second compressor when the first compressor is in operation.

According to aspects of the disclosure, the second compressor is configured to charge the second air tank in between drilling of holes, when the at least one filter of the dust collector is to be purged. Again, this is a situation when the compressor being utilised for flushing is not in operation, and where the use of a compressor being more sized to the task can be beneficial from an energy consumption point of view.

According to aspects of the disclosure, the second air tank is charged, during drilling, utilising the flow of compressed air being diverted from the first compressor, and the compressed air of the second air tank is then used to purge the at least one filter of the dust collector. Hence, the same air tank may be used for purging, but where the air tank is charged by either the first or the second compressor, in dependence of the otherwise prevailing operating conditions. According to aspects of the disclosure, the second power source, and thereby the second compressor, is configured to be turned off when the first power source is turned on.

According to aspects of the invention, the drill rig further comprises a flushing system comprising the first compressor for generating compressed air for flushing a drill hole, and at least one duct for conveying compressed air from the compressor into a drill hole to flush drilling remnants therefrom.

According to aspects of the disclosure, the first compressor is configured to be selectively disconnectable, e.g., using a clutch or other suitable means, from the first power source. This provides for further possibilities of saving energy, since the larger compressor can be disconnected from the power source, thereby eliminating also any idle load, and the smaller compressor be used in situations where the larger compressor is not needed for other purposes, and the capacity of the smaller compressor is sufficient.

According to aspects of the disclosure, the power rating of the first compressor is at least ten times higher, or even higher, than the power rating of the second compressor. The second compressor may hence be considerably smaller than the first compressor, with associated energy savings as result.

According to aspects of the disclosure, the drill rig further comprises a control system for controlling operation of the first and the second compressor, where the control system being configured to, when the at least one filter of the dust collector is to be purged: control the second compressor to provide compressed air for purging the at least one filter of the dust collector when the first compressor is not operating, control the first compressor to purge the at least one filter of the dust collector when the first compressor is operating, and turnoff the second compressor when the first compressor is operating.

Hence, the control system can control the purging such that the first compressor is used for purging when it is already in operation, but where the second compressor is used when the first compressor is not in operation, to thereby improve overall energy consumption. According to aspects of the disclosure, the first power source is a combustion engine or an electric motor, and the second power source is an electric motor.

According to aspects of the disclosure, the drill rig is a surface drill rig.

According to aspects of the disclosure, the second compressor may also be utilised for providing compressed air for other purposes than purging filters of the dust collector, where such other purposes may comprise situations where previously the main compressor has been used, and where the second compressor may be used instead to lower energy consumption when the main compressor is unnecessarily large for the task at hand. For example, the second compressor may be used when something needs to be rinsed or cleaned, such as radiators or air filters.

The disclosure also relates to a method for purging a filter of a drill rig. It will be appreciated that all features described for the drill rig aspects of the disclosure are applicable also to the method aspects of the disclosure. Also, the method and its aspects have advantages corresponding to the advantages discussed above with regard to the drill rig.

Further aspects of the disclosure will emerge from the detailed description.

Brief description of the drawings

Fig. 1 schematically illustrates a surface drill rig;

Fig. 2 schematically illustrates an exemplary prior art configuration of a flushing and dust collection system of a drill rig according to Fig. 1 ;

Fig. 3 schematically illustrates a method according to aspects of the disclosure;

Fig. 4 schematically illustrates a configuration of a flushing and dust collection system according to aspects of the disclosure;

Fig. 5 schematically illustrates a configuration of a flushing and dust collection system according to further aspects of the disclosure.

Detailed description of aspects of the disclosure Aspects of the present disclosure will be exemplified in the following in view of a particular example of a surface drill rig. The disclosure is, however, applicable for all kinds of surface drill rigs where a dust collection system comprising at least one filter is utilised.

Fig. 1 illustrates a surface rock drilling rig 100 for drilling holes, e.g., according to a drill plan for drilling a face and subsequently blast the face during mining. The drill rig 100 may also be used for various other types of surface drilling. The drill rig 100 is in the process of drilling a hole 130, where a not yet drilled part of the hole is indicated by dashed lines.

The drill rig 100 comprises a carrier 101 , and a boom 102, a proximal end of which being attached to the carrier, such as a carrier vehicle, in such a way that it can pivot in relation to the carrier 101 via one or more articulated joints.

Furthermore, the distal end of the boom 102 is configured to carry, through a feeder holder 108, a feeder, also denoted feed beam, 103. The feed beam 103 carries a carriage 104, which is slidably arranged along the feed beam 103 to allow the carriage 104 to run along the feed beam 103. The carriage 104, in turn, carries a drilling machine 105 which may provide rotation and/or percussion. The drilling machine 105 may hence run along the feed beam 103 by sliding the carriage 104. The drilling machine 105, or carriage 104, also provides a feed force acting on a drill string 106 during drilling to thereby press a drill bit 107 against the rock face being drilled.

It is to be understood that the present aspect is only exemplary, and that the feeder may carry any kind of tool, and hence not necessarily a drilling machine. For example, in case the drill rig 100 is used for down-the-hole (DTH) drilling, the carriage 104 may instead be configured to carry a rotation unit, which in turn is connected to a percussion device, i.e. , drilling machine, in the form of a DTH hammer by means of a drill string. As the name implies, the DTH hammer (percussion device) works down the hole at the end of the drill string. The disclosure is equally applicable for this kind of surface drill rigs.

The drilling machine 105 is, according to the present example, hydraulically driven and being power supplied from one or more hydraulic pumps 109, and at least one first compressor 111 may be utilised to provide for flushing of drill cuttings during drilling, and for various other functions that may require compressed air. The hydraulic pump(s) 109, compressor 111 and possible other power consumers such as e.g., further hydraulic pumps may be driven by a power source 110, e.g., in the form of a combustion engine such as a diesel engine or any other suitable power source, such as e.g., an electrical motor, or a combination of power sources. The drilling process may be controlled from the operator cabin 114. Alternatively, the rock drilling rig 100 may be remotely controlled or be configured to operate autonomously. Drill rigs of the illustrated kind as so far discussed are known per se, and additional features added according to the disclosure will be discussed below.

The drill rig 100 further comprises a rig control system comprising at least one control unit 120. The control unit 120 is configured to control various of the functions of the drill rig 100, such as controlling the drilling process. In case the drill rig 100 is manually operated, the control unit 120 may receive control signals from the operator, e.g. being present in an operator cabin 114 through operator controllable means such as joysticks and other means requesting various actions to be taken, and where the control signals, such as operator inflicted joystick deflections and/or manoeuvring of other means, may be translated by the control system to suitable control commands., e.g. for controlling boom, feeder, drilling machine etc.

Drill rigs of the disclosed kind may also comprise more than one control unit, e.g., a plurality of control units, where each control unit, respectively, may be arranged to be responsible for monitoring and carrying out various functions of the drill rig 100. For reasons of simplicity, however, it will be assumed in the following that the various functions are controlled by the control unit 120. Such control systems may further utilise any suitable kind of data bus to allow communication between various units of the drill rig 100. In case the drill rig 100 is manoeuvred by an operator various data may be displayed, e.g., on one or more displays in the operator cabin 114.

In order to obtain an efficient drilling, the drill remnants that are generated during drilling must be removed from the drill hole, e.g., in order to prevent the drill string from getting stuck. The drill remnants may therefore be flushed out of the drill hole during drilling by a flushing media comprising compressed air that is fed to the drill rod, and led through a channel, such as a tube, e.g., in the centre of a drill rod 106, or drill string, and is discharged near a drill bit 107. This is schematically indicated by arrows in Fig. 1 . The compressed air may be provided using an air tank 112 being charged by the compressor 111 through suitable hosing 113, and the compressed air flushes the drill cuttings upwards through and out of the hole 130, as indicated by the upwardly directed arrows in Fig 1. In addition to compressed air, the flushing media may, for example, also comprise water mist with or without a chemical additive.

Dilling may give rise to substantial amounts of dust that may be detrimental, e.g. to air quality in the surroundings of the drill rig and also to various components on the drill rig, such as components sucking air from the surroundings and, e.g., air being used for other purposes on the drill rig. The drill rig 100 therefore comprises a dust collection system (DCT) 115, in the following denoted dust collector, which collects dust through suction, where a hose 116 may connect the dust collector 115 to the drill hole 130, where, e.g., a dust guard or other suitable means may be utilised to prevent dust from spreading into the ambience, and facilitate suction by the dust collector 115.

The dust collector 115 may hence be used to reduce the presence of particles in the surroundings of the drill rig, where in particular one or more filters may be used to filter away such particles. The dust collector may comprise a plurality of filters, e.g., in the order of 5-10 filters or more. These one or more filters, however, will, as time progress, become clogged and thereby reduce the efficiency of the dust collector.

The filters must therefore be cleaned, also denoted purged, during operation, where this can be accomplished by directing gusts of compressed air directed at the filters from a direction opposite the direction of suction of the dust collector 115.

Fig. 2 illustrates an exemplary layout of a compressor system according to the prior art that may be utilised in drill rigs of the kind illustrated in Fig. 1 for purging filters of a DCT. In particular, the compressor system of Fig. 2 is utilised both for providing compressed air for flushing the drill hole and also compressed air for purging the one or more filters of the DCT.

In particular, the figure illustrates a power source 210, such as power source 110 in Fig. 1 . Furthermore, the figure also illustrates a compressor 211 , which is connected in such a manner that an input shaft of the compressor 211 is connected to an output shaft of the power source 210. Hence, when the power source 210 is operating, the compressor 211 may automatically be driven by the power source 210, and also at all times the power source 210 is operating. The compressor 211 is used to discharge a flow of compressed air which is used to charge an air tank 212. The compressed air being accumulated in the air tank 212 may be utilised for various purposes. For example, the compressed air may, in the manner described above, be used as a flushing medium, e.g. mixed with water and/or other substances, to provide for the flushing of drill remnants out of the drill hole as described above. Activation and deactivation of the supply of compressed air for flushing may be controlled using a valve 231 , which may selectively connect the air tank 212 to the flushing conduit, such as conduit 113 in Fig. 1 that provides flushing medium to the bottom of the drill hole for evacuation of drill remnants.

In addition to using the compressed air for flushing of drill remnants, the compressed air may also, according to the present example, be utilised to the purge filters of the dust collector. In this regard the system is provided with a further valve 240, which is utilised to control an amount of compressed air and also air pressure being drawn from the air tank 212 for purging purposes. The air being drawn from the air tank 212 is used to charge a second air tank 241 , also denoted air tank DCT in the figures. When the filters need to be cleaned, this cleaning of the filters may be carried out through purging, where compressed air stored in the air tank DCT 241 is used to blow away dust collected on the filters 243 of the dust collector. The activation/deactivation of the purging is controlled by a second valve 242 that selectively connects air tank DCT 241 to the filters of the dust collector 115 to provide for the desired cleaning of the filters.

Even though the solution of Fig. 2 provides a desired purging of the filters, the energy efficiency leaves room for improvement. Aspects of the disclosure provides for a more efficient use of energy resources for certain situations. An exemplary method according to the disclosure is illustrated in Fig. 3, and components of the system are illustrated in Fig. 4, which illustrates a first example of a purging system according to aspects of the disclosure. Fig. 4 illustrates an exemplary layout of a compressor system that, similar to the compressor system of Fig. 2, is utilised both for providing compressed air for flushing the drill hole and also compressed air for purging the one or more filters of the DCT.

Also similar to Fig. 2, the figure illustrates a power source 410, such as power source 110 in Fig. 1 , and also a compressor 411 , which also is connected in such a manner that an input shaft of the compressor 411 is connected to an output shaft of a power source 410, such as power source 110 in Fig. 1 . This also means that, as was described above, the compressor 211 may be automatically driven by the power source 410 when the power source 410 is operating, and also at all times the power source 410 is operating. The compressor 411 is also used in the same manner as was described with reference to Fig. 2 in regard of providing flushing of the drill hole through charging of an air tank 412, where activation and deactivation of the supply of compressed air for flushing may be controlled using a valve 431 as described above. In addition, the compressed air being accumulated in the air tank 412 is also utilised for purging of the filters of the dust collector 115. However, in this case air from air tank 412, and hence compressed air discharged by compressor 411 is only used for purging in certain circumstances. In particular, air from air tank 412 is used for purging purposes in situations when drilling is ongoing, and compressor 411 anyway is in operation. Hence, when drilling is ongoing, and thereby flushing of the hole that is being drilled, the compressor 411 is utilised for purging of the filters of the dust collector.

When, on the other hand, drilling is not ongoing, or for any other reason the main compressor is not operating, a second, auxiliary, compressor 451 is utilised. The second compressor 451 is not powered by the main power source 410, but instead by a second power source 450 that is operated independently, and hence separately, from the power source 410 that powers the main compressor 410. This provides for a solution where the main power source 410, and main compressor 411 , need not be taken into operation when the filters 443 of the dust collector 115 need to be purged in a situation where the main power source 411 and main compressor 410 otherwise would remain inoperative. In this way it is made possible to use an auxiliary power source, and auxiliary compressor, that are of considerable smaller dimensions than the main power source and main compressor that need to be designed for maximum power being utilised during drilling. Thereby considerable energy savings may be obtained.

The second compressor 451 , may, as is illustrated in Fig. 4, be configured to charge the second air tank 241 , i.e., air tank DCT 441 , and hence the same air tank that is charged by the main compressor 411 when purging filters during. Similar to above, activation/deactivation and air pressure of using the main compressor for providing air for purging may be controlled by a valve 440, which may be kept closed when purging filters using the auxiliary compressor 451 .

Further to the exemplary method illustrated in Fig. 3, the method commences in step 301 , where it is determined whether the filters 443 of the dust collector need to be purged. For example, the filters 443 may be cleaned, e.g., at regular intervals and/or when a reduction in dust collection is detected, such as a reduction in dust collection airflow or a differential pressure over the filters exceeding a predetermined limit. When it is determined that purging of the filters is required the method continues to step 302, where it is determined whether drilling is ongoing. When this is the case, purging will be carried out essentially in the same manner as has been exemplified in Fig. 2.

Consequently, when it is determined in step 302 that drilling is ongoing, purging of the filters of the dust collector is carried out using an air flow from the main compressor 411 , step 303 in Fig. 3, where valve 440 is utilised to charge the air tank DCT 441 for subsequent purging.

When, on the other hand, it is determined in step 302 that drilling is not ongoing, the method continues to step 304 where compressed air flow from auxiliary compressor 451 is used instead through charging of the air tank 442.

In sum, a flow of compressed air discharged by the main compressor may be utilised during drilling to flush the drill hole from drill cuttings, where this compressor may also be utilised to purge filters of the dust collector when drilling is ongoing by utilising part of the flow of compressed air being discharged by the main compressor. When drilling is not ongoing, a flow of compressed air from an auxiliary compressor is instead used to purge the at least one filter of the dust collector. In this way the main compressor need to operate solely for purposes of this kind, with the result that energy may be saved by using a smaller compressor to provide compressed air for purging when the main compressor is not in operation, since the amount of compressed air that is necessary for purging is much lower than the air flow required for flushing, and the purging is also carried out only intermittently. The auxiliary compressor can be configured to charge the auxiliary air tank only when the first compressor is not in operation. For example, the auxiliary compressor may be configured to charge the second air tank in between drilling of holes, in situations when the at least one filter of the dust collector is to be purged, and in situations when the main compressor is not active.

During drilling, the second air tank may instead be charged utilising the flow of compressed air being diverted from the first compressor, where this may be carried out, e.g., when excess capacity is available from the main compressor.

Fig. 5 illustrates a further example according to aspects of the disclosure. The solution of Fig. 5 is similar to the solution of Fig. 4, however with the difference that the main compressor is selectively disconnectable from the main power source. According to the illustrated example, this is provided for through the use of a clutch 460, although other suitable means may also be utilised to disconnect the main compressor from the power source. This may further reduce energy consumption, since the main compressor need only be used precisely when required, and the power source may be used for other purposes without the compressor being connected as an unnecessary load.

According to aspects of the disclosure, the second compressor may also be utilised to provide compressed air for other use than purging of filters of the dust collector. For example, the compressed air of the second compressor may also be used for purging of various other filters that man be present on the drill rig, and also for other situations where compressed air is required, and where the capacity of a considerably smaller compressor fulfils the requirements.

Finally, the disclosure is not limited to the above-described aspects, but the disclosure relates to, and encompasses, all of the different aspects that are included within the scope of the independent claims.

Claims

1. A drill rig (100) comprising: a movable carrier (101 ); a boom (102) configured to carry a drill tool, the boom (102) attaching the drill tool to the movable carrier (101 ); a first compressor (411 ) configured to discharge a first flow of compressed air, the first flow of compressed air being utilised for flushing drill residues out of a drill hole during drilling; a first power source (110; 410) for powering the first compressor (411 ); a dust collector (115) for collecting drill residues being flushed out of a drill hole, the dust collector (115) comprising at least one filter; a second compressor (451 ) for discharging a second flow of compressed air, the second flow of compressed air being utilised to purge the filter of the dust collector (115); a second power source (450), being separate from the first power source (110; 410), for powering the second compressor (451 ).

2. A drill rig (100) according to claim 1 , wherein: the first (110; 410) and the second (450) power sources are configured to be operated independently from each other.

3. A drill rig (100) according to claim 1 or 2, wherein: the first flow of compressed air of the first compressor (411 ) is configured to charge a first air tank (412), wherein the flushing of drill residues from a drill hole during drilling is configured to utilise compressed air from the first air tank (412), and wherein part of the flow of compressed air being discharged by the first compressor (411 ) is configured to, during drilling, be utilised to purge the at least one filter of the dust collector (115).

4. A drill rig (100) according to any one of the claims 1 -3, further configured to: utilise the second flow of compressed air to purge the at least one filter of the dust collector (115) when the first compressor (411 ) is not in operation.

5. A drill rig (100) according to any one of the claims 1 -4, wherein: the second flow of the second compressor (451 ) is configured to charge a second air tank, wherein compressed air of the second air tank is utilised to purge the at least one filter of the dust collector (115).

6. A drill rig (100) according to claim 5, wherein the second compressor (451 ) is configured to charge the second air tank when the first compressor (411 ) is not in operation.

7. A drill rig (100) according to claim 5 or 6, wherein the second compressor (451 ) is configured to charge the second air tank in between drilling of holes, when the at least one filter of the dust collector (115) is to be purged.

8. A drill rig (100) according to any one of the claims 5-7, further being configured to, during drilling: charge the second air tank utilising the flow of compressed air being diverted from the first compressor (411 ), and utilise compressed air of the second air tank to purge the at least one filter of the dust collector (115).

9. A drill rig (100) according to any one of the claims 1 -8, wherein the second power source (450), and thereby the second compressor (451 ), is configured to be turned off when the first power source (110; 410) is turned on.

10. A drill rig (100) according to any one of the claims 1 -9, further comprising: a flushing system comprising: the first compressor (411 ) for generating compressed air for flushing a drill hole; at least one duct for conveying compressed air from the compressor into a drill hole to flush drilling remnants therefrom.

11 . A drill rig (100) according to any one of the claims 1 -10, wherein the first compressor (411 ) is configured to be selectively disconnectable from the first power source (110; 410).

12. A drill rig (100) according to any one of the claims, wherein the power rating of the first compressor (411 ) is at least ten times higher than the power rating of the second compressor (451 ).

13. A drill rig (100) according to any one of the preceding claims, further comprising: a control system for controlling operation of the first and the second compressor (451 ), the control system being configured to, when the at least one filter of the dust collector (115) is to be purged: control the second compressor (451 ) to provide compressed air for purging the at least one filter of the dust collector (115) when the first compressor (411 ) is not operating, control the first compressor (411 ) to purge the at least one filter of the dust collector (115) when the first compressor (411 ) is operating, and turnoff the second compressor (451 ) when the first compressor (411 ) is operating.

14. A drill rig (100) according to any one of the claims 1 -13, wherein the first power source (110; 410) is a combustion engine or an electric motor, and the second power source (450) is an electric motor.

15. A drill rig (100) according to any one of the claims 1 -13, wherein the drill rig (100) is a surface drill rig (100).

16. A method for purging a filter of a drill rig (100), the drill rig (100) comprising: a movable carrier (101 ); a boom (102) configured to carry a drill tool, the boom (102) attaching the drill tool to the movable carrier (101 ); a first compressor (411 ) configured to discharge a first flow of compressed air, the first flow of compressed air being utilised for flushing drill residues out of a drill hole during drilling; a first power source (110; 410) for powering the first compressor (411 ); a dust collector (115) for collecting drill residues being flushed out of a drill hole, the dust collector (115) comprising at least one filter; a second compressor (451 ) for discharging a second flow of compressed air, the second flow of compressed air being utilised to purge the filter of the dust collector (115); a second power source (450), being separate from the first power source (110; 410), for powering the second compressor (451 ), the method comprising: utilising the second compressor (451 ) to purge the at least one filter of the dust collector (115) when the first compressor (411 ) is not operating, and utilising the first compressor (411 ) to purge the at least one filter of the dust collector (115) when drilling is ongoing.

17. A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method according to claim 16.

18. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method according to claim 16.