A drill rod

Abstract

The present invention provides a drill rod, which relates to the technical field of drilling equipment and is designed to solve the problem that the current borehole wall is prone to breakage, resulting in hole collapse or blockage. The drill rod includes a drill rod body, a twist thread, and an extrusion ball hammer. The twist thread is fixedly arranged on the outer surface of the drill rod body, and the extrusion ball hammer is fixedly arranged on the outer surface of the drill rod body, and along the radial direction of the drill rod body, the extrusion ball hammer protrudes from the twist thread, wherein the extrusion ball hammer includes a plurality of ball hammer parts, and the plurality of ball hammer parts are arranged along the axial direction of the drill rod body, and the plurality of ball hammer parts are also arranged along the circumferential direction of the drill rod body, and along the axial projection of the drill rod body, the plurality of ball hammer parts together form a complete circular contour. The present invention can effectively improve the phenomenon of hole collapse or blockage caused by the breakage of the borehole wall.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, and in particular to a drill rod. Background Art

[0002] At present, coal and gas outburst mines, high-gas mines and rock burst mines have all implemented coal seam drilling underground for detection, gas extraction or release of coal rock pressure. However, due to the limitations of construction machinery, construction technology, coal seam damage and geological structure, after drilling construction, there are often a lot of coal slag and coal dust in the borehole, and the borehole wall is easy to break. The broken borehole wall can easily lead to borehole collapse or blockage, which has an adverse effect on drilling gas extraction or unloading coal rock pressure. In addition, if the borehole wall is incomplete, it is not conducive to placing the equipment in the borehole when using the borehole for in-hole geophysical exploration and other related detection work, and it will also cause great interference to the detection.

[0003] In response to the above problems, currently, compressed air slag removal or high-pressure water drilling flushing is usually used to clean the coal slag and coal dust in the borehole. However, compressed air slag removal and high-pressure water drilling flushing have great shortcomings in actual operation. Among them, compressed air slag removal is only effective for downhole drilling. When the borehole is long, it is difficult to discharge the coal slag in the deep hole even if the compressed air pressure is increased in time; high-pressure water drilling flushing is easy to damage the borehole in soft coal rock (especially broken coal rock in tectonic areas), further increasing the degree of breakage of the borehole wall, which has a great adverse effect on drilling gas extraction, unloading coal rock pressure and geophysical exploration in the hole. Summary of the invention

[0004] The first object of the present invention is to provide a drill rod to solve the current technical problem that the borehole wall is easily broken and causes hole collapse or blockage.

[0005] The drill rod provided by the present invention comprises a drill rod body, a twist thread and an extrusion ball hammer, wherein the twist thread is fixedly arranged on the outer surface of the drill rod body, the extrusion ball hammer is fixedly arranged on the outer surface of the drill rod body, and along the radial direction of the drill rod body, the extrusion ball hammer protrudes from the twist thread, wherein the extrusion ball hammer comprises a plurality of ball hammer parts, the plurality of ball hammer parts are arranged along the axial direction of the drill rod body, the plurality of ball hammer parts are also arranged along the circumferential direction of the drill rod body, and along the axial projection of the drill rod body, the plurality of ball hammer parts together form a complete circular contour.

[0006] Furthermore, the extrusion ball hammer includes three ball hammer parts, each of which has a radial center line perpendicular to the axial direction of the drill rod body, and the angle between the radial center lines of any two of the ball hammer parts of the extrusion ball hammer is 120°.

[0007] Further, the cross-section of the ball hammer portion along the axial direction of the drill rod body is arched, and the arch arches in the direction away from the drill rod body; and / or, the cross-section of the ball hammer portion along the radial direction of the drill rod body has a middle section and transition sections located at both ends of the middle section, and the middle section is connected to the outer surface of the drill rod body through the transition section, wherein the outer diameter of the transition section gradually decreases from the middle to the end.

[0008] Furthermore, the plurality of ball hammer parts of the extrusion ball hammer are arranged at intervals along the axial direction of the drill rod body.

[0009] Furthermore, a cable passage is provided inside the drill rod body, and the length direction of the cable passage is along the axial direction of the drill rod body, wherein the cable passage is provided with a slurry inlet and a plurality of slurry outlets, and each of the ball hammer parts of the extrusion ball hammer is provided with a liquid injection pipeline, the number of the slurry outlets is the same as the number of the liquid injection pipelines, one ends of the plurality of liquid injection pipelines are respectively connected to the plurality of slurry outlets in a one-to-one correspondence, and the other ends of the plurality of liquid injection pipelines extend to the outer surface of the corresponding ball hammer part.

[0010] Furthermore, the ball hammer portion has a radial center line that is perpendicular to the axial direction of the drill rod body, and the liquid injection pipeline is extended along the radial center line.

[0011] Furthermore, the drill pipe body is provided with a hollow cavity and a plurality of branch cavities connected to the hollow cavity, the hollow cavity forms the cable pipeline, and the plurality of branch cavities respectively form a plurality of liquid injection pipelines.

[0012] Furthermore, the twist thread includes a plurality of thread segments, the number of the extrusion ball hammers is plural, and along the axial direction of the drill rod body, the plurality of thread segments and the plurality of extrusion ball hammers are alternately arranged.

[0013] Furthermore, each of the thread segments includes a plurality of threads.

[0014] Furthermore, both ends of the drill rod body along its length direction are provided with connecting threads, and the connecting threads are configured to be connected to other drill rods.

[0015] The beneficial effects brought by the drill rod of the present invention are:

[0016] By providing a drill rod mainly composed of a drill rod body, a twist thread and an extruded ball hammer, when in use, the drill rod body of the drill rod can be connected with an ordinary drill rod and sent into a borehole through a drilling rig.

[0017] During the drilling process of the drill rod, the twist thread rotates to discharge slag. At the same time, the extrusion ball hammer protruding from the twist thread along the radial direction of the drill rod body will squeeze and compact the hole wall of the borehole to prevent the hole wall from being broken and causing the hole to collapse or block. In the above process, since the multiple ball hammer parts are arranged along the axial direction of the drill rod body and also arranged along the circumferential direction of the drill rod body, a slag discharge space can be formed between any two adjacent ball hammer parts. By using the slag discharge space, the coal slag and coal dust in the borehole can be further discharged outward, ensuring the slag discharge effect and improving the slag discharge efficiency. In addition, during the drilling process of the drill rod, since the multiple ball hammer parts are arranged along the axial direction of the drill rod body, and the drill rod body is always in a rotating state during the drilling process, as the drill rod is advanced forward, at the same depth position of the borehole, it will be subjected to the sequential squeezing and compacting effect of the multiple ball hammer parts. That is to say, each depth position of the borehole is subjected to multiple squeezing and compacting from the drill rod, which consolidates the squeezing and compacting effect and effectively prevents the rebound of the coal rock on the borehole wall after one squeezing and compacting. After the drilling construction is completed, the drill rod also has all the above functions during the retreat process, so I will not go into details.

[0018] It can be seen that this arrangement of the drill rod enables the hole wall to be squeezed and compacted during both the drilling and drilling withdrawal processes. Through multiple reciprocating squeezes and compactions during the two operation links of drilling and drilling withdrawal, the hole wall is effectively compacted and reinforced. At the same time, the arrangement of multiple ball hammers also forms an effective slag discharge space on the periphery of the drill rod body, so that the coal slag and coal dust inside the hole can be effectively discharged. This slag discharge method is not only effective for down-the-hole drilling, but also for longer holes. Moreover, since there is no need to flush the hole with high-pressure water, it further protects the hole and effectively solves the current technical problem that the hole wall is easily broken, resulting in hole collapse or blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a drill rod provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the middle drill pipe at section AA;

[0022] Figure 3 This is a schematic diagram of a drill rod provided by an embodiment of the present invention after being projected along its axial direction.

[0023] Description of reference numerals:

[0024] 100-drill pipe body; 200-twist thread; 300-squeeze ball hammer; 400-cable pipeline; 500-liquid injection pipeline; 600-connecting thread;

[0025] 210-threaded section;

[0026] 310-ball hammer; 320-circular profile; 330-radial centerline;

[0027] 311-middle section; 312-transition section. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Figure 1 A schematic diagram of the structure of the drill rod provided in this embodiment, Figure 2 for Figure 1 Schematic diagram of the middle drill pipe in section AA, Figure 3 This is a schematic diagram of the drill pipe provided in this embodiment after being projected along its axial direction. Figures 1 to 3 As shown, the present embodiment provides a drill rod, comprising a drill rod body 100, a twist thread 200 and an extrusion ball hammer 300, wherein the twist thread 200 is fixedly arranged on the outer surface of the drill rod body 100, the extrusion ball hammer 300 is fixedly arranged on the outer surface of the drill rod body 100, and along the radial direction of the drill rod body 100, the extrusion ball hammer 300 protrudes from the twist thread 200, specifically, the extrusion ball hammer 300 comprises a plurality of ball hammer parts 310, the plurality of ball hammer parts 310 are arranged along the axial direction of the drill rod body 100, the plurality of ball hammer parts 310 are also arranged along the circumferential direction of the drill rod body 100, and along the axial projection of the drill rod body 100, the plurality of ball hammer parts 310 together form a complete circular profile 320.

[0030] By providing a drill rod mainly composed of a drill rod body 100, a twist thread 200 and an extrusion ball hammer 300, when in use, the drill rod body 100 of the drill rod can be connected to an ordinary drill rod and sent into a borehole through a drilling rig.

[0031] During the drilling process of the drill rod, the twist thread 200 rotates to discharge slag. At the same time, the extrusion ball hammer 300 protruding from the twist thread 200 along the radial direction of the drill rod body 100 will squeeze and compact the hole wall of the drill hole to prevent the hole wall from being broken and causing the hole to collapse or block. In the above process, since the multiple ball hammer parts 310 are arranged along the axial direction of the drill rod body 100 and also arranged along the circumferential direction of the drill rod body 100, a slag discharge space can be formed between any two adjacent ball hammer parts 310. By using the slag discharge space, the coal slag and coal dust in the drill hole can be further discharged outward, ensuring the slag discharge effect and improving the slag discharge efficiency. Furthermore, during the drilling process of the drill rod, since the multiple ball hammers 310 are arranged along the axial direction of the drill rod body 100, and the drill rod body 100 is in a rotating state during the drilling process, as the drill rod advances forward, at the same depth position of the borehole, it will be squeezed and compacted by the multiple ball hammers 310 in sequence, that is, each depth position of the borehole is squeezed and compacted by the drill rod multiple times, which consolidates the squeezing and compacting effect and effectively prevents the rebound of the coal rock on the borehole wall after one squeezing and compacting. After the drilling construction is completed, the drill rod also has all the above functions during the retreat process, so it will not be repeated.

[0032] It can be seen that this arrangement of the drill rod enables the hole wall to be squeezed and compacted during both the drilling process and the drilling withdrawal process. The hole wall is effectively compacted and reinforced through multiple reciprocating squeezing and compacting during the two operation links of drilling and drilling withdrawal. At the same time, the arrangement of multiple ball hammer parts 310 also forms an effective slag discharge space on the periphery of the drill rod body 100, so that the coal slag and coal dust inside the hole can be effectively discharged. This slag discharge method is not only effective for down-hole drilling, but also for longer holes. Moreover, since there is no need to flush the hole with high-pressure water, it further protects the hole and effectively solves the current technical problem that the hole wall is easily broken and causes hole collapse or blockage.

[0033] In this embodiment, the ball hammer part 310 is a solid structure. Such a configuration can not only effectively utilize the inertial force of the ball hammer part 310 during its rotation to hammer the hole wall to ensure the extrusion and compaction effect, but also can reduce the damage to the ball hammer part 310 caused by the hammering operation, thereby extending the service life of the ball hammer part 310.

[0034] Please continue to refer to Figure 1 and Figure 3 In this embodiment, the extrusion ball hammer 300 includes three ball hammer parts 310, and the ball hammer parts 310 have radial center lines 330 perpendicular to the axial direction of the drill rod body 100, wherein the angle between the radial center lines 330 of any two ball hammer parts 310 of the extrusion ball hammer 300 is 120°. In other words, the three ball hammer parts 310 of the extrusion ball hammer 300 are evenly distributed along the circumference of the drill rod body 100.

[0035] Through the above arrangement, on the one hand, the hole wall of the drill hole can be effectively squeezed and compacted, and on the other hand, the uniformity of the radial force on the drill rod during drilling can be ensured to avoid the drill rod from twisting off due to eccentric rotation.

[0036] In other embodiments, the ball hammer parts 310 in the extrusion ball hammer 300 can also be in other quantities, such as: four, etc. In this case, the four ball hammer parts 310 are evenly arranged along the circumference of the drill rod body 100, and the angle between the radial center lines 330 of any two ball hammer parts 310 is 90°, which can also achieve the effect of squeezing and compacting the hole wall and avoiding twisting of the drill rod.

[0037] Please continue to refer to Figure 1 In this embodiment, the cross section of the ball hammer portion 310 along the axial direction of the drill rod body 100 is arched, and the arch rises in a direction away from the drill rod body 100.

[0038] During the drilling and retracting process of the drill rod, the drill rod body 100 will move in the depth direction of the drill hole. The above arrangement makes the ball hammer part 310 always contact the wall of the drill hole through the part with a smaller outer diameter. As the drill rod body 100 moves forward or backward, the ball hammer part 310 contacts the wall of the drill hole through the part with a larger outer diameter. With this arrangement, no sharp edges are formed in the axial direction of the ball hammer part 310, which avoids scratches on the wall of the drill hole caused by the ball hammer part 310 during the movement process, and plays a protective role in the drill hole.

[0039] Please continue to refer to Figure 2 , Figure 2 The cross-sectional shape of a ball hammer portion 310 of the extrusion ball hammer 300 is illustrated. Specifically, the ball hammer portion 310 has a radial cross-section along the drill rod body 100, and has a middle section 311 and transition sections 312 located at both ends of the middle section 311. The middle section 311 is connected to the outer surface of the drill rod body 100 through the transition section 312, wherein the outer diameter of the transition section 312 gradually decreases from the middle to the end.

[0040] During the drilling and retracting process of the drill rod, the drill rod body 100 will rotate inside the borehole. The above arrangement enables the ball hammer part 310 to first contact the borehole wall through the smaller outer diameter part of the transition section 312 during the rotation process, and then gradually contact the borehole wall through the larger outer diameter part of the transition section 312 and the middle section 311 as the drill rod body 100 continues to rotate. With such an arrangement, no sharp edges are formed in the radial direction of the ball hammer part 310, thereby avoiding scratches on the borehole wall caused by the ball hammer part 310 during the rotation process, and protecting the borehole.

[0041] Please continue to refer to Figure 1In this embodiment, the plurality of ball hammer parts 310 of the extrusion ball hammer 300 are arranged at intervals along the axial direction of the drill rod body 100. That is, along the axial direction of the drill rod body 100, there is a set interval between any two adjacent ball hammer parts 310 of the extrusion ball hammer 300.

[0042] Through the above arrangement, a slag discharge gap is formed between any two adjacent ball hammer parts 310, so as to facilitate the discharge of coal slag and coal dust in the borehole during the drilling or withdrawal process of the drill rod.

[0043] Please continue to refer to Figure 1 In this embodiment, a cable pipeline 400 can also be set inside the drill rod body 100, and the length direction of the cable pipeline 400 is along the axial direction of the drill rod body 100. Specifically, the cable pipeline 400 is provided with a slurry inlet and multiple slurry outlets, and each ball hammer part 310 of the extrusion ball hammer 300 is provided with a spray pipeline 500. The number of slurry outlets is the same as the number of spray pipelines 500. One ends of the multiple spray pipelines 500 are respectively connected to the multiple slurry outlets one by one, and the other ends of the multiple spray pipelines 500 extend to the outer surface of the corresponding ball hammer part 310.

[0044] During the drilling or withdrawal process of the drill rod, water or slurry can be supplied to the cable pipeline 400 through the slurry inlet, so that the water or slurry is sprayed onto the borehole wall through the spray pipeline 500 arranged on each ball hammer part 310, which has a certain wetting effect on the dry coal rock on the borehole wall, similar to the mud treatment of the borehole wall, and the integrity of the borehole wall is repaired, the extrusion and compaction effect is strengthened, the integrity and smoothness of the borehole wall are ensured, the hole quality is further improved, and the risk of borehole breakage is reduced.

[0045] It should be noted that the water or slurry provided to the cable pipeline 400 through the slurry inlet can be high-pressure water mist or cement slurry mist. This setting makes the wetting effect of the coal slag and coal rock on the hole wall more uniform, and can also reduce the erosion of the hole wall caused by strong water pressure.

[0046] Please continue to refer to Figure 2 and Figure 3 In this embodiment, the liquid spraying pipeline 500 is extended along the radial center line 330 of the ball hammer part 310. Such an arrangement can shorten the path of the liquid spraying pipeline 500, so that the water or slurry entering through the cable pipeline 400 can quickly reach the hole wall.

[0047] Please continue to refer to Figure 1 In this embodiment, the drill pipe body 100 is provided with a hollow cavity and a plurality of branch cavities connected to the hollow cavity, wherein the hollow cavity forms a cable pipeline 400, and the plurality of branch cavities respectively form a plurality of liquid injection pipelines 500.

[0048] This arrangement in which a cavity is opened in the drill pipe body 100 to form the cable pipeline 400 and the injection pipeline 500 has a simple structure, and the obtained cable pipeline 400 and the injection pipeline 500 are of good quality. Moreover, there is no need to purchase additional pipelines or perform additional pipeline laying work, thereby saving costs and improving efficiency.

[0049] Please continue to refer to Figure 1 In this embodiment, the twist thread 200 includes a plurality of thread segments 210 , and the number of the extrusion ball hammers 300 is multiple. Along the axial direction of the drill pipe body 100 , the plurality of thread segments 210 and the plurality of extrusion ball hammers 300 are alternately arranged.

[0050] Such an arrangement makes the force on the drill rod body 100 at various positions along its axial direction relatively uniform, thereby ensuring the stability of the drill rod in drilling or retracting. In addition, since the drill rod body 100 is provided with a plurality of spaced-apart threaded sections 210 and a plurality of spaced-apart extrusion ball hammers 300 along its length direction, it can further ensure the extrusion and compaction effect on the hole wall and the effect of deslagging during drilling.

[0051] Please continue to refer to Figure 1 In this embodiment, each thread segment 210 includes two threads. This arrangement can ensure the slag removal effect of the thread segment 210, so that the coal slag and coal dust in the drill hole can be smoothly discharged through the thread segment 210.

[0052] In other embodiments, the number of threads of each threaded segment 210 may be other numbers, such as three or four circles, etc., which may be specifically designed according to the length of the drill pipe body 100 and will not be described in detail in this embodiment.

[0053] Please continue to refer to Figure 1 In this embodiment, both ends of the drill rod body 100 along the length direction thereof are provided with connecting threads 600. Specifically, the connecting threads 600 are configured to be connected with other drill rods.

[0054] By setting connecting threads 600 at both ends of the drill rod body 100, it is convenient to connect the drill rod with other drill rods, so that the drill rod of this embodiment can be used with any type of drilling rig and drill rods of any specifications, which is highly practical and suitable for industrial promotion and use.

[0055] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

[0056] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0057] In the above embodiments, the descriptions of directions such as “inside”, “outside”, and “side” are all based on the drawings.

[0058] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drill pipe, characterized in that: The invention comprises a drill rod body (100), a twist thread (200) and an extrusion ball hammer (300), wherein the twist thread (200) is fixedly arranged around the outer surface of the drill rod body (100), the extrusion ball hammer (300) is fixedly arranged on the outer surface of the drill rod body (100), and along the radial direction of the drill rod body (100), the extrusion ball hammer (300) protrudes from the twist thread (200), wherein the extrusion ball hammer (300) comprises a plurality of ball hammer parts (310), the plurality of ball hammer parts (310) are arranged along the axial direction of the drill rod body (100), the plurality of ball hammer parts (310) are also arranged along the circumferential direction of the drill rod body (100), and along the axial projection of the drill rod body (100), the plurality of ball hammer parts (310) are arranged along the circumferential direction of the drill rod body (100). The ball hammer parts (310) together form a complete circular profile (320); a cable pipeline (400) is arranged inside the drill rod body (100), and the length direction of the cable pipeline (400) is along the axial direction of the drill rod body (100), wherein the cable pipeline (400) is provided with a slurry inlet and a plurality of slurry outlets, and each of the ball hammer parts (310) of the extrusion ball hammer (300) is provided with a liquid injection pipeline (500), the number of the slurry outlets is the same as the number of the liquid injection pipelines (500), one end of the plurality of liquid injection pipelines (500) is respectively connected to the plurality of slurry outlets in a one-to-one correspondence, and the other end of the plurality of liquid injection pipelines (500) extends to the outer surface of the corresponding ball hammer part (310).

2. The drill pipe according to claim 1, characterized in that: The extrusion ball hammer (300) comprises three ball hammer parts (310), each of which has a radial center line (330) perpendicular to the axial direction of the drill rod body (100), and the included angle between the radial center lines (330) of any two of the ball hammer parts (310) of the extrusion ball hammer (300) is 120°.

3. The drill pipe according to claim 1, characterized in that: The cross section of the ball hammer portion (310) along the axial direction of the drill rod body (100) is arched, and the arch rises in the direction away from the drill rod body (100); and / or the cross section of the ball hammer portion (310) along the radial direction of the drill rod body (100) has a middle section (311) and transition sections (312) located at both ends of the middle section (311), and the middle section (311) is connected to the outer surface of the drill rod body (100) through the transition section (312), wherein the outer diameter of the transition section (312) gradually decreases from the middle to the end.

4. The drill pipe according to claim 1, characterized in that: The plurality of ball hammer parts (310) of the extrusion ball hammer (300) are arranged at intervals along the axial direction of the drill rod body (100).

5. The drill pipe according to claim 1, characterized in that: The ball hammer part (310) has a radial center line (330) perpendicular to the axial direction of the drill rod body (100), and the liquid injection pipeline (500) is extended along the radial center line (330).

6. The drill pipe according to claim 1, characterized in that The drill pipe body (100) is provided with a hollow cavity and a plurality of branch cavities connected to the hollow cavity, the hollow cavity forms the cable pipeline (400), and the plurality of branch cavities respectively form a plurality of liquid injection pipelines (500).

7. The drill pipe according to any one of claims 1 to 6, characterized in that: The twist thread (200) comprises a plurality of thread segments (210), and the number of the extrusion ball hammers (300) is plural. Along the axial direction of the drill rod body (100), the plurality of thread segments (210) and the plurality of extrusion ball hammers (300) are alternately arranged.

8. The drill pipe according to claim 7, characterized in that Each of the thread segments (210) includes a plurality of threads.

9. The drill pipe according to any one of claims 1 to 6, characterized in that: Both ends of the drill rod body (100) along the length direction thereof are provided with connecting threads (600), and the connecting threads (600) are configured to be connected to other drill rods.

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