CN114412377A - Mining drill rod - Google Patents
Mining drill rod Download PDFInfo
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- CN114412377A CN114412377A CN202210088390.7A CN202210088390A CN114412377A CN 114412377 A CN114412377 A CN 114412377A CN 202210088390 A CN202210088390 A CN 202210088390A CN 114412377 A CN114412377 A CN 114412377A
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- drill rod
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- 238000005065 mining Methods 0.000 title claims abstract description 75
- 238000007789 sealing Methods 0.000 claims abstract description 250
- 239000012530 fluid Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 17
- 238000005553 drilling Methods 0.000 abstract description 7
- 239000003245 coal Substances 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The utility model provides a mining drilling rod, relates to drilling rod technical field. This mining drilling rod includes: the drill rod comprises a drill rod body, a first sealing joint and a second sealing joint, wherein the first sealing joint and the second sealing joint are positioned at two ends of the drill rod body; the first sealing joint is of a round table-shaped structure, and the side wall of the first sealing joint is sequentially provided with an external conical surface section, a male thread section and a first step surface in the direction close to the drill rod main body; the second sealing joint is provided with a circular truncated cone-shaped through hole, and the inner wall of the circular truncated cone-shaped through hole is sequentially provided with a second step surface, an inner conical surface section and a female thread section in the direction away from the drill rod main body. In the embodiment of the disclosure, when two mining drill rods are connected, multiple sealing can be formed, and the sealing performance of the connection part of the mining drill rods is improved, so that the pressure loss of high-pressure fluid is reduced, the high-pressure fluid can be conveyed to the bottom of a drill hole at higher pressure, and the reaming effect is ensured. In addition, the sealing performance of the joint of two adjacent mining drill rods is good, so that leakage of high-pressure fluid can be avoided, and safety accidents are avoided.
Description
Technical Field
The disclosure relates to the technical field of drill rods, in particular to a mining drill rod.
Background
Because the gas outburst is a main unsafe factor of coal mining and seriously influences the coal mining safety, the first pumping and the second pumping are mandatory regulations of the coal mining in China. And advanced drilling is needed during extraction, the larger the aperture of the drilled hole is, the better the pressure relief effect of the coal bed is, and the higher the gas extraction rate and the extraction amount are.
In actual production, under the premise of determining the torque of a drilling machine, the hole diameter of a drilled hole is difficult to increase by increasing the specification of a drill bit and the specification of a drill rod. Therefore, in the related art, the hydraulic punching technology is adopted for reaming to increase the hole diameter of the drilled hole. The hydraulic punching technology is a technology for conveying high-pressure fluid to the bottom of a hole along a mining drill rod, and spraying the high-pressure fluid to the hole wall through a nozzle at a drill bit to cut and crush a coal seam on the hole wall so as to expand the hole. After hydraulic punching, the aperture of the drilled hole can be increased from 113-203 mm to 460-1440 mm.
However, when reaming is performed by the hydraulic piercing technique, the inventors have found that the hole diameter after reaming does not achieve the intended effect.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The utility model aims to provide a mining drilling rod can improve the sealing performance of drilling rod post, the reaming effect when guaranteeing the hydraulic punching operation.
According to one aspect of the present disclosure, there is provided a mining drill rod comprising: the drill rod comprises a drill rod body, a first sealing joint and a second sealing joint, wherein the first sealing joint and the second sealing joint are positioned at two ends of the drill rod body;
the first sealing joint is of a round table-shaped structure, the large-diameter end of the first sealing joint is close to the drill rod main body, the small-diameter end of the first sealing joint is far away from the drill rod main body, and the side wall of the first sealing joint is sequentially provided with an external conical surface section, a male thread section and a first step surface in the direction close to the drill rod main body;
the second sealing joint is provided with a circular truncated cone-shaped through hole, the large-diameter end of the circular truncated cone-shaped through hole is far away from the drill rod main body, the small-diameter end of the circular truncated cone-shaped through hole is close to the drill rod main body, and the inner wall of the circular truncated cone-shaped through hole is sequentially provided with a second step surface, an inner conical surface section and a female thread section in the direction far away from the drill rod main body;
the end face of the small-diameter end of the first sealing joint can be attached to the second step face of the second sealing joint, the outer conical face section of the first sealing joint can be attached to the inner conical face section of the second sealing joint, the male thread section of the first sealing joint can be connected with the female thread section of the second sealing joint in a threaded mode, and the first step face of the first sealing joint can be attached to the end face, close to the large-diameter end of the circular truncated cone-shaped through hole, of the second sealing joint.
According to any one of the mining drill rods disclosed by the disclosure, the first step surface is of a conical structure.
According to the mining drill rod disclosed by the invention, the included angle between the generatrix of the first step surface and the axial direction of the drill rod main body is greater than or equal to 70 degrees and less than or equal to 85 degrees.
According to the mining drill rod disclosed by the invention, the first step surface is of a plane structure, and the plane of the first step surface is not vertical to the axial direction of the drill rod main body.
According to the mining drill rod disclosed by the invention, the second step surface is conical, and an included angle between a bus of the second step surface and the axial direction of the drill rod main body is greater than or equal to 50 degrees and less than or equal to 85 degrees.
According to the mining drill rod disclosed by the invention, the included angle between the generatrix of the outer conical surface section and the axial direction of the drill rod main body is greater than or equal to 5 degrees and less than or equal to 7 degrees.
According to the mining drill rod disclosed by any one of the disclosures, an included angle between a bus of the outer conical surface section and the axial direction of the drill rod main body is larger than an included angle between the bus of the inner conical surface section and the axial direction of the drill rod main body, and the difference value between the bus of the outer conical surface section and the axial direction of the drill rod main body is larger than or equal to 1 degree and smaller than 5 degrees.
According to the mining drill rod disclosed by the invention, the diameter of the small end of the outer conical surface section is smaller than that of the small end of the inner conical surface section, and the difference value of the diameter of the small end of the outer conical surface section and the diameter of the small end of the inner conical surface section is greater than or equal to 0.5mm and less than or equal to 3 mm.
According to any one of the mining drill rods disclosed by the disclosure, a first annular sealing surface is arranged on one side, close to the outer conical surface section, of the male thread section on the side wall of the first sealing joint, and a second annular sealing surface is arranged on one side, close to the inner conical surface section, of the female thread section on the inner wall of the circular truncated cone-shaped through hole;
the mining drill rod further comprises a first sealing ring, the first annular sealing surface or the second annular sealing surface is provided with a first sealing groove, and the first sealing ring is located in the first sealing groove and used for sealing a gap between the first annular sealing surface and the second annular sealing surface.
According to any one of the mining drill rods disclosed by the disclosure, a third annular sealing surface is arranged on one side, close to the first step surface, of the male thread section on the side wall of the first sealing joint, and a fourth annular sealing surface is arranged on one side, far away from the inner conical surface section, of the female thread section on the inner wall of the circular truncated cone-shaped through hole;
the mining drill rod further comprises a second sealing ring, the third annular sealing surface or the fourth annular sealing surface is provided with a second sealing groove, and the second sealing ring is located in the second sealing groove and used for sealing a gap between the third annular sealing surface and the fourth annular sealing surface.
The mining drill rod of any of the present disclosure, the third annular sealing surface and/or the fourth annular sealing surface having a first stress relief groove.
The embodiment of the disclosure at least comprises the following technical effects:
in the embodiment of the disclosure, when two mining drill rods are connected, multiple sealing can be formed, and the sealing performance of the joint of the two adjacent mining drill rods is improved, so that the pressure loss of high-pressure fluid is reduced, the high-pressure fluid can be conveyed to the bottom of a drill hole at higher pressure, and the reaming effect is ensured. In addition, the sealing performance of the joint of two adjacent mining drill rods is good, so that leakage of high-pressure fluid can be avoided, and safety accidents are avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 is a schematic cross-sectional structural view of a mining drill rod provided in an embodiment of the present disclosure.
Fig. 2 is a schematic cross-sectional structural view of a first sealing joint according to an embodiment of the present disclosure.
Fig. 3 is a schematic cross-sectional structural view of a second sealing joint according to an embodiment of the present disclosure.
Fig. 4 is a schematic cross-sectional view of another first sealing joint according to an embodiment of the present disclosure.
Fig. 5 is a schematic cross-sectional view of another second sealing joint according to an embodiment of the present disclosure.
Reference numerals:
1. a drill rod body; 2. a first sealing joint; 3. a second sealing joint; 4. a first seal ring; 5. a second seal ring;
21. an outer conical surface section; 22. a male thread segment; 23. a first step surface; 24. a first annular sealing surface; 25. a third annular seal face; 241. a first seal groove;
31. a second step surface; 32. an inner conical surface section; 33. a female thread segment; 34. a second annular sealing surface; 35. a fourth annular seal surface; 351. a second seal groove.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
In the related art, when hydraulic punching operation is performed on a drill hole, a plurality of mining drill rods need to be sequentially connected to obtain a drill rod column, and then high-pressure fluid is conveyed to the bottom of the drill hole along the drill rod column. The inventor finds that the initial pressure is controlled to be 20MPa or even higher when the high-pressure fluid is conveyed, but the pressure of the high-pressure fluid reaching the bottom of the drill hole is only about 12MPa, so that the hole expanding effect is not obvious. After earnest research, the inventor finds that when high-pressure fluid is conveyed along a drill rod column, the pressure loss of the high-pressure fluid is too large due to poor sealing performance at the joint of two adjacent mining drill rods, and the pressure of the high-pressure fluid is lower when the high-pressure fluid reaches the bottom of a drill hole.
The disclosed embodiment provides a mining drill rod. As shown in fig. 1, the mining drill rod comprises: the drill rod comprises a drill rod body 1 and a first sealing joint 2 and a second sealing joint 3 which are arranged at two ends of the drill rod body 1.
The drill rod body 1, the first sealing joint 2 and the second sealing joint 3 are provided with through holes along respective central line directions, and after the drill rod body, the first sealing joint and the second sealing joint are connected, the respective central line directions coincide. The drill rod body 1, the first sealing joint 2 and the second sealing joint 3 are of an integral structure, and may be fixedly connected by welding or other methods.
As shown in fig. 2, the first sealing joint 2 is a circular truncated cone-shaped structure, the large diameter end of the first sealing joint 2 is close to the drill rod body 1, and the small diameter end is far away from the drill rod body 1, and the side wall of the first sealing joint 2 sequentially has an external conical surface section 21, a male thread section 22 and a first step surface 23 in the direction close to the drill rod body 1. As shown in fig. 3, the second sealing joint 3 has a circular truncated cone-shaped through hole, a large diameter end of the circular truncated cone-shaped through hole is far away from the drill rod body 1, and a small diameter end of the circular truncated cone-shaped through hole is close to the drill rod body 1, and the inner wall of the circular truncated cone-shaped through hole is sequentially provided with a second step surface 31, an inner conical surface section 32 and a female thread section 33 in the direction far away from the drill rod body 1.
The end face of the small-diameter end of the first sealing joint 2 can be attached to the second step face 31 of the second sealing joint 3, the outer conical face section 21 of the first sealing joint 2 can be attached to the inner conical face section 32 of the second sealing joint 3, the male thread section 22 of the first sealing joint 2 can be in threaded connection with the female thread section 33 of the second sealing joint 3, and the first step face 23 of the first sealing joint 2 can be attached to the end face of the large-diameter end, close to the circular truncated cone-shaped through hole, of the second sealing joint 3.
For the mining drill rod disclosed in the embodiment of the disclosure, in actual use, a plurality of mining drill rods are sequentially connected. When a plurality of mining drill rods are connected, for any two adjacent mining drill rods, the first sealing joint 2 of the first mining drill rod and the second sealing joint 3 of the second mining drill rod in the two adjacent mining drill rods are connected in a sealing mode. Therefore, in actual use, the first sealing joint 2 of the first mining drill rod and the second sealing joint 3 of the second mining drill rod of two adjacent mining drill rods are described.
The male thread section 22 of the first sealing joint 2 is in threaded connection with the female thread section 33 of the second sealing joint 3, at the moment, the first step surface 23 of the first sealing joint 2 is attached to the end surface, far away from the corresponding drill rod main body 1, of the second sealing joint 3 (the first step surface 23 is sealed), the outer conical surface section 21 of the first sealing joint 2 is attached to the inner conical surface section 32 of the second sealing joint 3 (the conical surface is sealed), the second step surface 31 of the second sealing joint 3 is attached to the end surface, far away from the corresponding drill rod main body 1, of the first sealing joint 2 (the second step surface 31 is sealed), therefore, multiple sealing between two adjacent mining drill rods is achieved, the sealing performance of the connection position of the two adjacent mining drill rods is improved, the pressure loss of high-pressure fluid is reduced, the high-pressure fluid can be conveyed to the bottom of a drill hole under high pressure, and the hole expanding effect is guaranteed. In addition, the sealing performance of the joint of two adjacent mining drill rods is good, so that leakage of high-pressure fluid can be avoided, and safety accidents are avoided.
When the first sealing joint 2 and the second sealing joint 3 are screwed, the first sealing joint 2 and the second sealing joint 3 are in extrusion contact, namely, the first step surface 23 of the first sealing joint 2 and the end surface of the second sealing joint 3, which is far away from the corresponding drill rod main body 1, are in extrusion fit, the outer conical surface section 21 of the first sealing joint 2 and the inner conical surface section 32 of the second sealing joint 3 are in extrusion fit, and the second step surface 31 of the second sealing joint 3 and the end surface of the first sealing joint 2, which is far away from the corresponding drill rod main body 1, are in extrusion fit, so that interference contact can be formed at each fit position, and the sealing effect of each fit position is improved.
In the embodiment of the disclosure, when the first step surface 23 of the first sealing joint 2 is attached to the end surface of the second sealing joint 3 far away from the corresponding drill pipe body 1, the end surfaces of the first step surface 23 and the second sealing joint 3 are both in a planar structure, so that the first step surface 23 is sealed by attaching two planes.
Of course, in order to further ensure the sealing effect and improve the torsional strength of the mining drill rod when forming the first step surface 23 seal, in some embodiments, as shown in fig. 2 or 4, the first step surface 23 has a conical structure, and correspondingly, as shown in fig. 3 or 5, the corresponding end surface of the second sealing joint 3 also has a conical structure. Therefore, the contact area between the first step surface 23 of the first sealing joint 2 and the corresponding end surface of the second sealing joint 3 can be increased, so that the sealing effect is improved, the probability of puncture is reduced, and the torsional strength of the mining drill rod is improved.
The large-diameter end of the first step surface 23 is close to the drill rod main body 1, so that the first sealing joint 2 can smoothly extend into the circular truncated cone-shaped through hole of the second sealing joint 3. The included angle between the generatrix of the first step surface 23 and the axial direction of the drill rod body 1 is greater than or equal to 70 ° and less than or equal to 80 °, and the included angle between the generatrix of the first step surface 23 and the axial direction of the drill rod body 1 is 72 °, 74 °, 76 °, or 78 °, for example. Therefore, besides the contact area of the corresponding end surfaces of the first step surface 23 and the second sealing joint 3 is ensured, the situation that the first sealing joint 2 or the second sealing joint 3 is thin in local position and easy to damage can be avoided, and the service life of the mining drill rod is ensured.
In other embodiments, the first step surface 23 is a plane structure and is not perpendicular to the axial direction of the drill rod body 1, and correspondingly, the corresponding end surface of the second sealing joint 3 is a plane structure and is parallel to the plane of the first step surface 23. Therefore, the contact area between the first step surface 23 of the first sealing joint 2 and the end surface of the second sealing joint 3 can be increased, so that the sealing effect is improved, and the torsional strength of the mining drill rod is improved.
Wherein, the included angle between the plane of the first step surface 23 and the axial direction of the drill rod main body 1 is greater than or equal to 70 degrees and less than or equal to 80 degrees. Therefore, besides the contact area of the corresponding end surfaces of the first step surface 23 and the second sealing joint 3 is ensured, the situation that the first sealing joint 2 or the second sealing joint 3 is thin in local position and easy to damage can be avoided, and the service life of the mining drill rod is ensured.
In the embodiment of the disclosure, when the second step surface 31 of the second sealing joint 3 is attached to the end surface of the first sealing joint 2 far from the corresponding drill rod body 1, the attachment condition of the second step surface 31 to the corresponding end surface of the first sealing joint 2 can refer to the attachment of the first step surface 23 to the corresponding end surface of the second sealing joint 3, so as to increase the contact area between the second step surface 31 of the second sealing joint 3 and the corresponding end surface of the first sealing joint 2, reduce the probability of puncture, improve the sealing effect, and improve the torsional strength of the mining drill rod.
For example, as shown in fig. 3 or fig. 5, the second step surface 31 is conical, and correspondingly, as shown in fig. 2 or fig. 4, the corresponding end surface of the first sealing joint 2 is also conical.
Wherein, the included angle between the generatrix of the second step surface 31 and the axial direction of the drill rod main body 1 is greater than or equal to 50 degrees and less than or equal to 85 degrees. Preferably, the included angle between the generatrix of the second step surface 31 and the axial direction of the drill rod body 1 is greater than or equal to 50 ° and less than or equal to 60 °. Illustratively, the included angle between the generatrix of the second step surface 31 and the axial direction of the drill rod body 1 is 52 °, 54 °, 56 ° or 58 °. Therefore, the condition that the local position of the first sealing joint 2 or the second sealing joint 3 is thin and easy to damage can be avoided while the contact area of the corresponding end surface of the second step surface 31 and the first sealing joint 2 is ensured, and the service life of the mining drill rod is ensured.
In some embodiments, the included angle between the generatrix of the outer conical surface section 21 and the axial direction of the drill rod body 1 is greater than or equal to 5 ° and less than or equal to 7 °. Illustratively, the included angle between the generatrix of the outer conical surface section 21 and the axial direction of the drill rod body 1 is 6 °.
Wherein, the included angle between the generatrix of the inner conical surface section 32 and the axial direction of the drill rod body 1 is larger than the included angle between the generatrix of the outer conical surface section 21 and the axial direction of the drill rod body 1, and the difference value between the generatrix of the inner conical surface section and the axial direction of the drill rod body 1 is larger than or equal to 1 degree and smaller than 5 degrees. Exemplarily, an included angle between a bus of the inner conical surface section 32 and the axial direction of the drill rod main body 1 is 9 degrees, so that the first sealing joint 2 can be ensured to extend into the circular truncated cone-shaped through hole of the second sealing joint 3, and the outer conical surface section 21 of the first sealing joint 2 and the inner conical surface section 32 of the second sealing joint 3 can be in interference fit, so that the sealing effect of conical surface sealing between the first sealing joint 2 and the second sealing joint 3 is ensured.
Wherein, the small end diameter of the outer conical surface section 21 is smaller than that of the inner conical surface section 32, and the difference between the two is greater than or equal to 0.5mm and less than or equal to 3 mm. Illustratively, the small end diameter of the outer conical surface section 21 is 1mm, 2mm, etc. smaller than the small end diameter of the inner conical surface section 32.
In the embodiment of the present disclosure, the male thread section 22 on the first sealing joint 2 and the female thread section 33 on the second sealing joint 3 may be hardened to improve the hardness of the threads on the male thread section 22 and the female thread section 33, so that the threads of the male thread section 22 and the threads of the female thread section 33 are damaged when being pressed against each other.
Wherein, the hardening treatment includes but is not limited to quenching treatment and nitriding treatment. For example, the first sealing joint 2 and the second sealing joint 3 are made of 35CrMo steel, and the male thread section 22 of the first sealing joint 2 and the female thread section 33 of the second sealing joint 3 can be hardened through oil quenching at 850 ℃ and tempering at 550 ℃.
In some embodiments, the thread roots of the threads of the male thread section 22 and the thread roots of the threads of the female thread section 33 are cold rolled, and the surfaces of the threads are coated with a sealing grease to improve the sealing performance of the threaded connection between the first sealing joint 2 and the second sealing joint 3 and prevent high-pressure fluid from entering the gap between the male thread section 22 and the female thread section 33.
In some embodiments, the pin thread section 22 and the box thread section 33 are double-shoulder rectangular taper threads, the thread front end has a large chamfer structure, and the thread pitch is a segmented variable thread pitch. So, first sealing joint 2 and second sealing joint 3 pass through threaded connection back, and the pretightning force of screw thread is greater than intracavity medium pressure, has improved threaded connection's leakproofness, and the chamfer structure can effectively reduce the stress concentration of screw thread, improves the life of public screw thread section 22 and female screw thread section 33.
In some embodiments, the thread ridge of the male thread section 22 and the start tooth portion of the thread ridge of the female thread section 33 have chamfers, so as to avoid stress concentration on the thread ridges and improve the service life of the thread ridges, and thus the service life of the first and second sealing joints 2 and 3.
Wherein, the included angle between the chamfer of the initial tooth part and the axial direction of the drill rod main body 1 is more than 55 degrees. Illustratively, the included angle between the chamfer of the starting tooth part and the axial direction of the drill rod body 1 is 60 degrees, 70 degrees, 80 degrees and the like.
In the embodiment of the present disclosure, in combination with the above description, after the first sealing joint 2 is inserted into the second sealing joint 3 and screwed, a quadruple seal, that is, a first step surface 23 seal, a threaded section seal, a tapered surface seal and a second step surface 31 seal, may be formed.
In order to further improve the sealing performance of the first sealing joint 2 and the second sealing joint 3 after connection, in some embodiments, as shown in fig. 4, the first sealing joint 2 has a first annular sealing surface 24 on the side of the side wall of the male thread section 22 close to the outer conical surface section 21, and a second annular sealing surface 34 on the side of the inner wall of the frustoconical through hole close to the inner conical surface section 32 of the female thread section 33; the mining drill pipe further includes a first seal ring 4, the first annular seal face 24 or the second annular seal face 34 having a first seal groove 241 (as shown in fig. 4, the first seal groove 241 is located on the first annular seal face 24), the first seal ring 4 being located in the first seal groove 241 and being configured to seal a gap between the first annular seal face 24 and the second annular seal face 34.
In this way, after the first sealing joint 2 extends into the circular truncated cone-shaped through hole of the second sealing joint 3, the first sealing ring 4 can be pressed by the first annular sealing surface 24 and the second annular sealing surface 34, so that a double seal can be further formed between the first annular sealing surface 24 and the second annular sealing surface 34, and the sealing effect can be further improved. The first sealing ring 4 may be a polypropylene sealing ring or a polytetrafluoroethylene sealing ring.
The cross section of the first sealing groove 241 is rectangular, and the rectangular cross section has an inner corner chamfer and an outer corner chamfer, and the radius of the inner corner chamfer is greater than that of the outer corner chamfer. Illustratively, the inside chamfer has a corner radius of 1mm and the outside chamfer has a corner radius of 0.2 mm.
The distance between the first seal groove 241 and the second step surface 31 is greater than or equal to 5mm and less than or equal to 8 mm. For example, the distance between the first seal groove 241 and the second step surface 31 is 7 mm.
Further, in order to ensure the pressing effect on the first seal ring 4 when the first and second annular seal surfaces 24 and 34 press the first seal ring 4, the first and/or second annular seal surfaces 24 and 34 have a second stress relief groove. Therefore, stress can be released through the second stress release groove, and the situation that the first sealing ring 4 is blocked by stress concentration to deform is avoided.
In other embodiments, as shown in fig. 5, the first sealing joint 2 has a third annular sealing surface 25 on the side wall of the male thread segment 22 close to the first step surface 23, and a fourth annular sealing surface 35 on the side wall of the frustoconical through hole away from the inner conical surface segment 32 of the female thread segment 33; the mining drill rod further includes a second seal ring 5, the third annular seal surface 25 or the fourth annular seal surface 35 having a second seal groove 351 (as shown in fig. 5, second seal groove 351 is located on fourth annular seal surface 35), and the second seal ring 5 is located in second seal groove 351 and is used for sealing a gap between the third annular seal surface 25 and the fourth annular seal surface 35.
Wherein, the distance between the second sealing groove 351 and the first step surface 23 is 5-10 mm.
Further, when the third annular sealing surface 25 and the fourth annular sealing surface 35 press the first seal ring 4, in order to ensure the pressing effect on the second seal ring 5, the third annular sealing surface 25 and/or the fourth annular sealing surface 35 have a first stress relief groove. Thus, stress can be released through the first stress release groove, and the situation that the second seal ring 5 is blocked by stress concentration is avoided.
In connection with the above description, by way of example, the diameter of the mining drill rod provided by the embodiment of the present disclosure is 89mm, and the length of the mining drill rod is 36mm compared to the length of the mining drill rod in the conventional technology, and the length of the mining drill rod is increased by 36mm, so that the mining drill rod includes the first sealing joint 2 and the second sealing joint 3 to machine the external conical surface section 21 and the internal conical surface section 32, wherein the axial lengths of the external conical surface section 21 and the internal conical surface section 32 along the drill rod body 1 are both 5mm, the included angle between the bus of the external conical surface section 21 and the axial direction of the drill rod body 1 is 8 degrees, the included angle between the bus of the internal conical surface section 32 and the axial direction of the drill rod body 1 is 10 degrees, the small end diameter of the external conical surface section 21 is 62mm, and the small end diameter of the internal conical section is 63 mm; a first sealing groove 241 is machined in the first annular sealing surface 24 of the first sealing joint 2, the width of the first sealing groove 241 is 3.5mm, the depth of the first sealing groove is 2mm, the distance from the first step surface 23 is 7mm, the inner corner chamfering radius of the first sealing groove 241 is 1mm, and the outer corner chamfering radius is 0.2 mm; processing second seal groove 351 on fourth annular sealing face 35 of second sealing joint 3, the width of second seal groove 351 is 3.5mm, and the degree of depth is 2mm, and the distance to second step face 31 is 7mm, and the interior angle chamfer radius of second annular seal groove is 1mm, and the exterior angle chamfer radius is 0.2 mm.
The internal pressure resistance of the drill rod column formed by the sequential connection of the mining drill rods can reach more than 35MPa, so that high-pressure fluid can be conveyed to the bottom of a drill hole at higher pressure.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (11)
1. A mining drill rod, comprising: the drill rod comprises a drill rod body, a first sealing joint and a second sealing joint, wherein the first sealing joint and the second sealing joint are positioned at two ends of the drill rod body;
the first sealing joint is of a round table-shaped structure, the large-diameter end of the first sealing joint is close to the drill rod main body, the small-diameter end of the first sealing joint is far away from the drill rod main body, and the side wall of the first sealing joint is sequentially provided with an external conical surface section, a male thread section and a first step surface in the direction close to the drill rod main body;
the second sealing joint is provided with a circular truncated cone-shaped through hole, the large-diameter end of the circular truncated cone-shaped through hole is far away from the drill rod main body, the small-diameter end of the circular truncated cone-shaped through hole is close to the drill rod main body, and the inner wall of the circular truncated cone-shaped through hole is sequentially provided with a second step surface, an inner conical surface section and a female thread section in the direction far away from the drill rod main body;
the end face of the small-diameter end of the first sealing joint can be attached to the second step face of the second sealing joint, the outer conical face section of the first sealing joint can be attached to the inner conical face section of the second sealing joint, the male thread section of the first sealing joint can be connected with the female thread section of the second sealing joint in a threaded mode, and the first step face of the first sealing joint can be attached to the end face, close to the large-diameter end of the circular truncated cone-shaped through hole, of the second sealing joint.
2. The mining drill rod of claim 1, wherein the first step surface is of a conical configuration.
3. The mining drill rod of claim 2, wherein an angle between a generatrix of the first step face and an axial direction of the drill rod body is greater than or equal to 70 ° and less than or equal to 85 °.
4. The mining drill rod of claim 1, wherein the first step face is of planar configuration and is in a plane that is non-perpendicular to an axial direction of the drill rod body.
5. The mining drill rod of claim 1, wherein the second step surface is conical, and an included angle between a generatrix of the second step surface and the axial direction of the drill rod body is greater than or equal to 50 degrees and less than or equal to 85 degrees.
6. The mining drill rod of claim 1, wherein an angle between a generatrix of the outer conical surface section and an axial direction of the drill rod body is greater than or equal to 5 ° and less than or equal to 7 °.
7. The mining drill rod of claim 6, wherein an angle between a generatrix of the outer conical surface section and an axial direction of the drill rod body is greater than an angle between a generatrix of the inner conical surface section and the axial direction of the drill rod body by a difference of greater than or equal to 1 ° and less than 5 °.
8. The mining drill rod of claim 7, wherein the minor end diameter of the outer conical section is less than the minor end diameter of the inner conical section by a difference of greater than or equal to 0.5mm and less than or equal to 3 mm.
9. The mining drill rod of any one of claims 1 to 8, wherein the first sealing joint has a first annular sealing surface on a side wall of the first sealing joint on a side of the pin section adjacent to the outer conical section and a second annular sealing surface on an inner wall of the frustoconical through bore on a side of the box section adjacent to the inner conical section;
the mining drill rod further comprises a first sealing ring, the first annular sealing surface or the second annular sealing surface is provided with a first sealing groove, and the first sealing ring is located in the first sealing groove and used for sealing a gap between the first annular sealing surface and the second annular sealing surface.
10. The mining drill rod of any one of claims 1 to 8, wherein the first sealing joint has a third annular sealing surface on a side wall of the first sealing joint on a side of the pin thread section adjacent to the first step surface, and a fourth annular sealing surface on an inner wall of the frustoconical through bore on a side of the box thread section remote from the inner cone surface section;
the mining drill rod further comprises a second sealing ring, the third annular sealing surface or the fourth annular sealing surface is provided with a second sealing groove, and the second sealing ring is located in the second sealing groove and used for sealing a gap between the third annular sealing surface and the fourth annular sealing surface.
11. The mining drill rod of claim 10, wherein the third annular sealing surface and/or the fourth annular sealing surface has a first stress relief groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210088390.7A CN114412377A (en) | 2022-01-25 | 2022-01-25 | Mining drill rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210088390.7A CN114412377A (en) | 2022-01-25 | 2022-01-25 | Mining drill rod |
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| Publication Number | Publication Date |
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| CN114412377A true CN114412377A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210088390.7A Pending CN114412377A (en) | 2022-01-25 | 2022-01-25 | Mining drill rod |
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| CN (1) | CN114412377A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117868701A (en) * | 2024-03-13 | 2024-04-12 | 大庆市瑞斯德石油机械制造有限公司 | Air-tight seal oil pipe based on special threads |
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