Drilling attachment device and mining machine

Abstract

Drilling attachment device (1) and mining machine (50) comprising a first end (10) for engaging a surface of a rock (100), a second end (11) opposite the first end (10) and arranged for attachment to a drill rig (20) of the mining machine (50), a casing (12) extending between the first and second ends (10, 11), at least one fluid channel (14) arranged between the first end (10) and the second end (11) for directing fluid flow from the second end (11) towards the first end (10), a check valve (15) movably arranged into the fluid channel (14) in the axial direction (X-X), and arranged to open for fluid flow through the fluid channel (14) in direction from the second end (11) towards the first end (10), and arranged to close for fluid flow in the opposite direction, wherein the check valve (15) comprises an RFID tag (16).

Description

DRILLING ATTACHMENT DEVICE AND MINING MACHINETechnical field

[0001] The present disclosure relates to a check valve mounted RFID identification tag for drilling consumables of a mining or construction machine.Background

[0002] Within for example mining industry, a mining machine, like a drill rig, use a lot of drilling consumables like drill bits, tricone bits, pipes, DTH hammers (the term DTH refers to Down The Hole) and other drilling consumables. For example, at DTH hammers, a drill bit or tricone bit is mounted at the end of the DTH hammer, depending on the application. The drill bits / tricone bits as well as other parts of the DTH hammer are exposed to a lot of wear and tear and need to be replaced frequently. Since operating time is crucial, the complete DTH hammer is replaced when the bit (or other wear part) is to be replaced, and a new or renovated (rebuilt) DTH hammer is applied to the drill rig / drill string. Since the drilling consumables are exposed to wear and tear, they normally need to be replaced often. For example, at DTH hammers, wear parts are replaced, but none-wear parts as for example the check valve, may be kept and reused, since the check valve and some other, mainly interior parts, are protected inside the housing of the DTH hammer. A DTH hammer may be renovated / rebuilt numerous times before it is completely wasted, which means that protected parts may be used during the entire life span of the hammer. The drilling consumable may have a serial number and performance data, together with a serial number of the consumable, may be logged. The latter, to keep track of the performance of the consumable, the maintenance planning of the same, and further also when to discard the complete DTH hammer / drilling consumable.

[0003] Drilling consumable performance is difficult to measure and is influenced by the operating parameters chosen by the operator. Electronic solutions exist to automatically gather performance data and to optimize operating parameters for various product models, but both such systems currently rely on manual data input to identify which drilling consumable is being used and when, and it may also differbased on the rebuild. One option is to use RFID tags (Radio Frequency Identification tags) attached on the drilling consumable, which offer a low cost, contact-free method for electronic systems to detect the unique identity of various products, including drilling consumables, and is used to identify the consumable. The identification of the drilling consumable is taking place during downtime of the drill, i.e. when replacing the drilling consumable.

[0004] Existing drilling consumable RFID mounting methods present issues with readability and survivability. Existing solutions provide mounting of RFID tags on external surfaces of rotating drilling consumables which create a moving target for RFID reader devices (i.e., the position of the tag may not be in position for the reader), requiring careful rotational indexing to read the identification properly. Further, externally mounted RFID tags are subject to severe damage as the product interacts with the rock formation. Additionally, rigid mounting of RFID devices anywhere in for example a DTH hammer or rotary bit, expose them to severe shock and vibration, why electronic devices have a severely limited life span in those environments. Finally, as mentioned above, externally exposed components like DTH hammers are often replaced as routine maintenance, meaning that RFID tags embedded thereon may be lost early in comparison with the total potential lifetime of the product.Summary

[0005] It is an object of the disclosure to address at least some of the problems and issues outlined above. One object of the present disclosure is to provide a drilling attachment device and a mining machine according to the independent claims.

[0006] The invention involves mounting RFID tags inside floating check valve parts, preferably adjacent to the threaded connections, which are common to DTH hammers, tricone bits, and pipes. This produces a rotationally constant tag mounting position that is roughly coaxial with the axis of the tool, enabling use of a fixed RFID reader antenna, moved directly above the disconnected threaded connection at appropriate times (downtime of the tool, i.e. changing wear partsand rebuilding of the tool). This mounting position inside the product also physically protects the RFID tag from contact with the formation being drilled, only exposing it when threaded connections are disconnected. These disconnections are precisely coincident with times requiring identification (at the change of tool to a new / renovated tool). Further, placement of RFID tags in check valves offers protection of the sensitive electronics, as these components are not rigidly affixed to the main body of the drilling consumable but instead float independent of those parts with position determined by pneumatic conditions. Lastly, placement of RFID technology in check valves enables continuity of RFID tag use throughout the wear life of a DTH hammer (or other drilling consumable comprising a check valve), as check valves are generally not replaced during the life of the product. All external components and some other internal components are replaced during repeated rebuilds.

[0007] Installing RFID components into check valve systems in drilling consumables provides an application-agnostic reading position that is protected from external damage, insulated from shock and vibration, and housed in components expected to last the entire life of the product.

[0008] According to one aspect, a drilling attachment device, arranged for removable attachment to a drill rig of a drilling machine, is disclosed. The drilling attachment device has an extension in an axial direction, around an imaginary central axis of the device, and comprises a first end, arranged for engaging a rock surface, for excavating rock material from the rock surface, and a second end, arranged opposite the first end, and arranged for attachment to the drill rig of the mining machine. The drilling attachment device further comprises a casing which extends in the axial direction, between the first end and second end of the drilling attachment device. And between the first end and second end, at least one fluid channel is arranged inside the casing. The fluid channel is arranged to direct fluid flow from the second end towards the first end, when the drilling attachment device is attached to the drill rig of the mining machine. The fluid channel is an open channel, but normally, the fluid flow flows from the drill rig, in direction from the drill rig to the second end and further, towards the first end of the drillingattachment device, at which first end for example a drill bit is attached, for excavation of rock material from a rock surface. The drilling attachment device further comprises a check valve which is movably arranged into the fluid channel such that it is movable at least in the axial direction and the check valve is arranged to open for fluid flow through the fluid channel in direction from the second end towards the first end, and arranged to close for fluid flow through the fluid channel in direction from the first end towards the second end, i.e. is arranged to prevent back flow of fluid from the first end in direction towards the second end. The drilling attachment device further comprises that the check valve of the drilling comprises an RFID tag.

[0009] By such a device, the RFID tag is prevented from shock forces, since it is arranged in the check valve, which is movably arranged in the axial direction, in the fluid channel. This is a far better solution compared to prior art solutions where RFID tags are arranged on external surfaces of the drilling consumable (drilling attachment device) exposed for wear and tear and also exposed for shock forces from the drilling operation. The hammering motion is per se a motion which is to be transferred from the drill rig to the drill bit via the drilling attachment device, wherein RFID tags in prior art solutions normally or very often need to be exchanged, wherein the identification of reusable parts is lost or must be registered manually. By arranging the RFID tag at the check valve, the drilling consumable, i.e. the drilling attachment device, may easily be registered since the check valve including the RFID tag is exposed towards the open end of the fluid channel by the check valves position in the fluid channel. It is also easy to reuse the RFID tag, since it is not exposed for shock forces, and by that is protected. The drilling attachment device may thereby be recorded regarding the number of restorations, running time etc. for the respective reused parts as well as how many times for example the drill bit, the casing etc., is changed. The expected lifetime of the RFID tag is improved due to its position at the check valve, and the planning of exchange and / or restoration is improved since the position entails an easy registration of the status etc. as described above.

[0010] According to a disclosure, the check valve is arranged distal from the first end and closer to the second end compared to the first end of the drilling attachment device. By this location, the RFID tag also is arranged closer to the second end and by that located in a better position for readability by a RFID reader, which normally is arranged at the drill rig of the machine. The identification operation is only actual when disconnecting the drilling attachment device (the consumable) from the drill rig, by disconnecting the second end of the drilling attachment device from the drill rig, wherein the check valve by its position and by its function (stopping backflow) is positioned close to the second end, and accessible for reading by an RFID reader.

[0011] According to a disclosure, the RFID tag is arranged at the check valve such that it faces the second end of the drilling attachment device. That is, the RFID tag is arranged on the “second end side” of the check valve, for the same reasons as discussed above.

[0012] According to a disclosure, the RFID tag is substantially coaxial with the central axis of the drilling attachment device.

[0013] According to a disclosure, the RFID tag substantially aligns with the fluid channel. Preferably, in both the above disclosures, the drilling attachment device extends symmetrical around the imaginary central axis around, and preferably also the fluid channel is symmetrically arranged around the imaginary central axis. Furthermore, the check valve is arranged in the fluid channel and is by that also symmetrically arranged in relation to the central axis and the RFID tag is arranged at the check valve such that is at least substantially coaxial with the central axis. This means that the RFID tag is exposed to the open fluid channel facing the second end of the drilling attachment device, when it is disconnected from the drill rig, wherein a precise and well-defined position of the RFID tag is achieved and no further repositioning is needed as for known solutions (where the rotation of the device makes the position of an external RFID tag makes the position uncertain). The RFID tag is exposed for RF reading from the second end via the open fluid channel and by that, it is easy to read the identification by a reader antenna / RFID reader positioned at the second end, coaxial with the central axis.

[0014] According to a disclosure, the check valve is floatingly arranged into the fluid channel. The expression “floatingly arranged” refers to the axial translational position of the check valve assembly in the fluid channel, The primary stress waves needing protection against travel along the axis of the DTH hammer, and the floating axial position excludes the check valve from transmission of those primary stress waves, whereby the overall lifetime of the check valve is improved.

[0015] According to a disclosure, the check valve comprises a spring, which is arranged to press the check valve in direction towards the second end of the drilling attachment device. The function of the spring is to prevent backflow in the fluid channel of the drilling attachment device, wherein the spring presses the check valve in direction towards the second end of the device. The spring preferably extends between one fixed and one movable part of the check valve, and when the fluid flow through the channel, in direction from the second end towards the first end, stops, the “return” spring presses the movable part of the check valve in direction towards the second end, wherein the movable part abuts a valve seat of the casing and back flow is prevented. Preferably, the check valve comprises sealings arranged to seal against the valve seat. By the spring, the moveable part, which faces the second end, is in a position close to the second end and the RFID tag is by that positioned to be read (identified) by the RFID reader. The spring, so to speak, ensures the position of the RFID tag in the “reading position”.

[0016] According to a disclosure, the check valve comprises a check valve body, wherein the check valve body has an upper center surface facing the second end of the drilling attachment device, and the RFID tag is fitted onto the upper center surface of the check valve body. The check valve body preferably is the moveable part of the check valve, described above.

[0017] According to a disclosure, the RFID tag is arranged in a milled pocket arranged in the upper center surface of the check valve body. By that, the RFID tag is protected but still open towards the fluid channel of the second end, and by that open for precise reading from the second end via the fluid channel, since the milled pocket with the RFID tag faces the fluid channel and second end.

[0018] According to a disclosure, the second end of the drilling attachment device comprises a threaded connection part, arranged for threaded attachment to the drill rig of the drilling machine, wherein the threaded connection part comprises a bore, which bore is a part of the fluid channel of the drilling attachment device, The RFID tag is coaxial to the bore of the connection part, wherein the RFID tag is exposed directly to a RFID reader oriented directly above said bore / the fluid channel, at time of disconnection of the drilling attachment device from the drill rig of the drilling machine.

[0019] According to a disclosure, the RFID tag is arranged to be read by a RFID reader oriented in close vicinity of the second end of the drilling attachment device.

[0020] According to an aspect, a mining machine is disclosed. The mining machine (drilling machine) comprises a drill rig for drilling in a rock, wherein the drill rig comprises a drilling attachment device according to any of the above described embodiments, and an RFID reader, arranged to read the RFID tag of the drilling attachment device.

[0021] According to a disclosure, the RFID reader is arranged to read the RFID tag of the drilling attachment device, by being oriented in close vicinity of the second end of the drilling attachment device, such that the fluid channel at the of the second end of the drilling attachment device, is exposed to the RFID reader, at time of disconnection of the drilling attachment device from the drill rig of the drilling machine.

[0022] According to a disclosure, the mining machine further comprises a positioning means, arranged to position either the drilling attachment device or RFID reader in a first position for enabling the RFID reader to read the RFID tag of the drilling attachment device. One option may be that the RFID reader (for example RFID reader antenna) may be fixedly arranged in a certain position on the drill rig, wherein the drilling attachment device, after disconnection (preferably automatic), is moved to the reading position in front of the RFID reader, or vice versa, the RFID reader moved to the RFIG tag in a certain reading position. The position may preferably be such that the orientation of the RFID tag / or reader is soas to maximize signal strength, for example coaxial with and facing the second end of the drilling attachment device (the DTH hammer), wherein the RFID tag is exposed to the open fluid channel. It is understood that the position of the RFID tag at the check valve is adapted to the design of the RFID reader, wherein the position may be coaxial ax described above, or at some diagonal angle relative to the coaxial position, depending on the RFID tag model and / or RFID reader model. Thus, down to the antenna lobe design of the reader and specifications on the specific tag, various possibilities in design and reading position are disclosed by the inventive concept.

[0023] Further possible features and benefits of this solution will become apparent from the detailed description below.Brief description of drawings

[0024] The invention is now described, by way of example, with reference to the accompanying drawings, in which:

[0025] Fig. 1 shows an example of a mining machine according to the invention.

[0026] Fig. 2 shows a drilling attachment device arranged with a check valve at which an RFID tag is arranged, according to the invention.

[0027] Fig. 3 shows the drilling attachment device of Fig. 2, and RFID reader arranged for reading (identification of) the RFID tag of the drilling attachment device.Detailed description

[0028] In the following, a drilling attachment device according to the invention is described. The drilling attachment device disclosed herein may be realized in many different forms and should not be construed as being limited to the examples set forth herein. Like numbers in the drawings refer to like elements throughout.

[0029] Fig. 1 shows a side view of a mining machine 50 which may be used for drilling in a rock 100. The mining machine comprises drill rig 20 which comprises adrilling attachment device 1 according to the invention, which will be described below.

[0030] Fig. 2 shows a drilling attachment device 1 , according to the invention. The drilling attachment device 1 is a so-called drilling consumable, since it is a part which needs to be exchanged and / or renovated often during the drilling operation in a mine or the like. Depending on the rock material, the roughness of the site etc., the drilling consumable might be needed to be exchanged often. When exchanging the drilling consumable, either for a complete new one or a renovated one, the drilling consumable, the drilling attachment device 1 in this case, is disconnected from the drill rig 20 and another drilling attachment device 1 is attached to the drill rig 20. The down time of the drilling operation should be kept to a minimum to keep excavation cost as low as possible so the disconnection and reconnection should preferably be quick and easy. Some parts of the drilling attachment device 1, mainly interior parts, may be kept numerous times, for example 10-12 times, while exterior parts might need to be exchanged more often. The renovation / restoration of the drilling attachment device 1 normally takes place in a workshop or the like, often remote from the drilling site and by renovating the drilling attachment device 1 instead of discarding the complete device when mainly exterior parts are “worn out”, the lifetime of at least some parts of the drilling attachment device 1 , mainly the interior parts, which not is worn out, is increased.

[0031] The drilling attachment device 1 has an extension in an axial direction X-X, around an imaginary central axis x of the device 1 , and the drilling attachment device 1 comprises a first end 10, arranged for engaging a rock surface, for excavating rock material from the rock 100. In the figure, the first end 10 comprises a drill bit 19, which is fixedly attached to the first end 10, and which is the actual part of the first end 10 which is arranged for engaging with the surface of the rock 100, for the excavation of rock material from the rock 100. The drill bit 19 is exposed for high wear and tear and is one of the parts of the drilling attachment device 1, which needs to be replaced when the drilling attachment device 1 is disconnected from the drill rig 20, for restoration. Opposite the first end 10, is a second end 11 arranged, which second end 11 is arranged for attachmentto the drill rig 20 of the mining machine 50, preferably by that the second end 11 comprises a threaded connection part 18. The threaded connection part 18 is arranged for threaded connection to the drill rig 20 and the threaded connection part 18 comprises a part of the fluid channel 14, in the form of a bore 19. A casing 12 extends in the axial direction X-X, between the first end 10 and the second end 11 of the drilling attachment device 1. Also the casing 12 is exposed for high wear and tear during the drilling operation and may also be one of the part which needs to be replaced with a new one, when renovating the drilling attachment device 1. The drilling attachment device 1 further comprises at least one fluid channel 1 , which extends as an open channel, between the first end 10 and the second end 11. The fluid channel 14 is by that at least partly arranged inside the casing 12 and is arranged to direct fluid flow from the second end 11 towards the first end 10, when the drilling attachment device 1 is attached to the drill rig 20 of the mining machine 50. The fluid channel 14 is an open channel and it is the fluid flow direction which sets the direction through the fluid channel 14. The fluid flow (air or water, depending on the application) is normally used while drilling and functions as a cooling for the device 1 (and drill bit) and also as a dust dampening function, while drilling in the rock.

[0032] To prevent backflow of fluid and / or particles, a check valve 15 is movably arranged into the fluid channel 14. The check valve 15 comprises a valve body 15b and the valve body 15b comprises a first body part 15d and a second body part 15e. The complete check valve 15 is “floatingly” arranged in the fluid channel 14 and is by that movable in the axial direction X-X. Further, the first body part 15d of the valve body 15 b is movable in relation to the second body part 15e of the valve body 15b. The check valve is by that arranged to open for fluid flow through the fluid channel 14 in direction from the second end 11 towards the first end 10, which is the flow direction during the drilling operation, and further arranged to close for fluid flow through the fluid channel 14 in the opposite direction, i.e. the direction from the first end 10 towards the second end 11. This backflow prevention position typically occurs when the fluid flow is stopped and at disconnection of the drilling attachment device 1 from the drill rig 20. Normally, the fluid flow is shut off before disconnection. There are different types of check valveswhich may be applicable to this inventive concept, for example spring-biased, flange-biased, diaphragm, swing, butterfly checkvalves etc. In the shown embodiment, the check valve 15 comprises a spring 17 (thereby a spring-biased type), which spring 17 is arranged to press the body part 15d of the valve body 15b, in direction towards the second end 11 of the drilling attachment device 1. The spring force is balanced such that when the fluid pressure of the drill rig 20 exceeds the spring force of the spring 17, the body part 15d of is moved towards the second body part 15e, and when the fluid pressure is lowered or is shut off, the spring force pushes the movable body part 15d away from the second body part 15e, to shut off and seal (via a seal) against a valve seat 22, arranged at the part of the fluid channel 14, which faces the second end 11 of the drilling attachment device 1.

[0033] In the embodiment of Fig. 2-3, the drilling attachment device 1 is a so-called DTH hammer which comprises a number of different parts arranged inside the casing 12, and which may be reused when renovating the DTH hammer 1. For example, the DTH hammer 1 has a piston 21, which during drilling, transfers the hammering motion from the drill rig, in the axial direction, by being movably arranged along the axial direction x. When drilling is started, the fluid flow makes sure the fluid channel 14 opens for fluid flow (see above), and the complete check valve 15 is floatingly arranged in the fluid channel (and in the fluid flow), wherein the check valve is protected from the hammering motion of the piston 21 and drill bit 19. Since the check valve is protected from the worst axial forces by isolation, it is a beneficial place for positioning an RFID tag 16, which is used for identification of the drilling attachment device 1. As mentioned above, the check valve 15 and other interior parts of the drilling attachment device 1 may be used several times, wherein the lifetime of those parts including the RFID 16 tag, is increased, since these parts are not wasted along with for example exterior wear parts, and the position of the RFID tag at the check valve further enables easy tracking of the drilling attachment device during the exchange of drilling attachment devices.

[0034] In the preferred embodiment, the check valve 15 is arranged distal from the first end 10 and closer to the second end 11 compared to the first end 10, ofthe drilling attachment device 1 , and the RFID tag 16 is arranged in a milled pocket 15c, arranged in an upper center surface 15a of the check valve body 15b of the check valve 15, such that the RFID tag 16 faces the second end 11 of the drilling attachment device 1. The RFID tag 16 is preferably arranged substantially coaxial with the central axis x of the tool, such that it substantially aligns with the fluid channel 14. Since the spring 17 is arranged to press the check valve 15, i.e. the movable body part 15d, in direction towards the second end 11 , i.e. against the seat 22 of the drilling attachment device 1 , when the fluid pressure is stopped, and the drilling attachment device 1 is disconnected, the RFID tag 16 is exposed for the open and fluid free fluid channel 14. Thereby, the RFID tag 16 is in a determined and secured position for reading the identification information of the RFID tag 16.

[0035] Fig. 3 shows the drilling attachment device 1 of Fig. 2, and a RFID reader 30, arranged for reading (identification of) the RFID tag 16 of the drilling attachment device 1. By that the RFID tag 16 is coaxial to the bore 19 of the connection part 18, i.e. the part of the fluid channel14, the RFID tag 16 is exposed directly to a RFID reader 30, which preferably is oriented directly above or within an area around said bore 19 / the fluid channel 14, at time of disconnection of the drilling attachment device 1 from the drill rig 20 of the drilling machine 50. Since RFID tags may be of different kinds (including BLE, UWB, passive RFID, active RFID etc.), and the RFID reader 30 as well, some diagonal angle relative the coaxial position as shown in the figure, may be appropriate. The antenna design of the RFID reader may for example have a wider lobe which enables a span of locations for the RFID tag. The drill rig 20 (or a separate part) may comprise a positioning means (not shown), which is arranged to position either the drilling attachment device 1 or the RFID reader 30, in a first position for enabling the RFID reader 30 to read the RFID tag 16 of the drilling attachment device 1 , wherein the identification as well as the change of the drilling attachment device 1 may be fully automated.

[0036] Although the description above contains a plurality of specificities, these should not be construed as limiting the scope of the concept described herein butas merely providing illustrations of some exemplifying embodiments of the described concept. It will be appreciated that the scope of the presently described concept fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the presently described concept is accordingly not to be limited. Reference to an element in the singular is not intended to mean "one and only one" unless explicitly so stated, but rather "one or more." All structural and functional equivalents to the elements of the abovedescribed embodiments that are known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed hereby. Moreover, it is not necessary for an apparatus or method to address each and every problem sought to be solved by the presently described concept, for it to be encompassed hereby. In the figures, a broken line generally signifies that the feature within the broken line is optional.

Claims

CLAIMS1. A drilling attachment device (1 ) arranged for removable attachment to a drill rig (20) of a drilling machine (50), the drilling attachment device (1) has an extension in an axial direction (X-X), around a central axis (x) of the device, the drilling attachment device (1) comprises:- a first end (10), arranged for engaging a surface of a rock (100), for excavating rock material from the rock (100),- a second end (11 ), arranged opposite the first end (10) and arranged for attachment to the drill rig (20) of the mining machine (50),- a casing (12) extending in the axial direction (X-X) between the first end (10) and second end (11 ) of the drilling attachment device (1 ),- at least one fluid channel (14) arranged inside the casing (12) and extending between the first end (10) and the second end (11 ), and arranged to direct fluid flow from the second end (11) towards the first end (10), when the drilling attachment device (1) is attached to the drill rig (20) of the mining machine (50), - a check valve (15) movably arranged into the fluid channel (14), wherein the check valve (15) is movable in the axial direction (X-X), wherein the check valve (15) is arranged to open for fluid flow through the fluid channel (14) in direction from the second end (11 ) towards the first end (10), and arranged to close for fluid flow through the fluid channel (14) in direction from the first end (10) towards the second end (11),wherein the check valve (15) of the drilling attachment device (1 ) comprises an RFID tag (16).

2. Drilling attachment device (1 ) according to claim 1 , wherein the check valve (15) is arranged distal from the first end (10) and closer to the second end (11 ) compared to the first end (10), of the drilling attachment device (1 ).

3. Drilling attachment device (1 ) according to claim 1 or 2, wherein the RFID tag (16) is arranged at the check valve (15) such that it faces the second end4. Drilling attachment device (1 ) according to any of the preceding claims, wherein the RFID tag (16) is substantially coaxial with the central axis (x) of the drilling attachment device.

5. Drilling attachment device (1 ) according to any of the preceding claims, wherein the RFID tag (16) substantially aligns with the fluid channel (14).

6. Drilling attachment device (1 ) according to any of the preceding claims, wherein the check valve (15) is floatingly arranged into the fluid channel (14).

7. Drilling attachment device (1 ) according to any of the preceding claims, wherein the check valve (15) comprises a spring (17), which is arranged to press the check valve (15) in direction towards the second end (11 ) of the drilling attachment device (1).

8. Drilling attachment device (1 ) according to any of the preceding claims, wherein the check valve (15) comprises a check valve body (15b), the check valve body (15b) having an upper center surface (15a) facing the second end (11 ) of the drilling attachment device (1), and wherein the RFID tag (16) is fitted onto the upper center surface (15a) of the check valve body (15b).

9. Drilling attachment device (1) according to claim 8, wherein the RFID tag (16) is arranged in a milled pocket (15c) arranged in the upper center surface (15a) of the check valve body (15b).

10. Drilling attachment device (1 ) according to any of the preceding claims, wherein the second end (11 ) of the drilling attachment device (1 ) comprises a threaded connection part (18), arranged for threaded attachment to the drill rig (20) of the drilling machine (50), wherein the threaded connection part (18) comprises a bore (19), which is a part of the fluid channel (14) of the drilling attachment device (1), wherein the RFID tag (16) is coaxial to the bore (19) of the connection part (18), wherein the RFID tag (16) is exposed directly to a RFID reader (30) oriented directly above said bore / the fluid channel (14) at time of disconnection of the drilling attachment device (1 ) from the drill rig (20) of the drilling machine (50).

11. Drilling attachment device (1 ) according to any of the preceding claims, wherein the RFID tag (16) is arranged to be read by a RFID reader (30) oriented in close vicinity of the second end (11 ) of the drilling attachment device (1 ).

12. A mining machine (50) comprising:a drill rig (20) for drilling in a rock (100), wherein the drill rig (20) comprises a drilling attachment device (1 ) according to any of the preceding claims, andan RFID reader (30), arranged to read the RFID tag (16) of the drilling attachment device (1).

13. Mining machine (50) according to claim 12, wherein the RFID reader (30) is arranged to read the RFID tag (16) of the drilling attachment device (1), by being oriented in close vicinity of the second end (11 ) of the drilling attachment device (1 ), such that the fluid channel (14) at the of the second end (11 ) of the drilling attachment device (1), is exposed to the RFID reader (30), at time of disconnection of the drilling attachment device (1 ) from the drill rig (20) of the drilling machine (50).

14. Mining machine (50) according to claim 12 or 13, further comprising:a positioning means, arranged to position either the drilling attachment device (1) or RFID reader (30) in a first position for enabling the RFID reader (30) to read the RFID tag (16) of the drilling attachment device (1).

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