CN215369730U - Shallow thread wear-resistant high-pressure drill rod connecting structure for coal mine - Google Patents
Shallow thread wear-resistant high-pressure drill rod connecting structure for coal mine Download PDFInfo
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- CN215369730U CN215369730U CN202120361765.3U CN202120361765U CN215369730U CN 215369730 U CN215369730 U CN 215369730U CN 202120361765 U CN202120361765 U CN 202120361765U CN 215369730 U CN215369730 U CN 215369730U
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Abstract
The utility model discloses a shallow thread wear-resistant high-pressure drill rod connecting structure for a coal mine, which comprises an external thread section and an internal thread section; the external thread section is arranged at the front end of the first drill rod, and the internal thread section is arranged at the rear end of a second drill rod connected with the front end of the first drill rod; a sealing groove is formed in the first diameter surface/the second diameter surface of the first drill rod/the second drill rod, a sealing ring is arranged in the sealing groove, and the sealing ring is used for sealing the connecting part of the first drill rod and the second drill rod so as to prevent high-pressure water in the water inlet channel inside the first drill rod and the second drill rod from leaking; according to the utility model, the sealing grooves are arranged on the first diameter surface/the second diameter surface of the first drill rod/the second drill rod, and the sealing rings are arranged in the sealing grooves, so that the sealing rings can be prevented from being exposed on the outer surfaces of the first drill rod and the second drill rod, the sealing rings are protected, and high-pressure water is ensured not to leak out.
Description
Technical Field
The utility model belongs to the technical field of conventional geological drilling equipment of coal mine tunnels, and particularly relates to a shallow-thread wear-resistant high-pressure drill pipe connecting structure for a coal mine.
Background
In coal mine drilling, due to the fact that a drill hole is long, a plurality of sections of drill rods are required to be connected with one another to form a combined long drill rod, and drilling operation is completed. Generally, the connected drill rods are connected through threads, and the drill rods are easily scrapped due to the problems of drill rod thread dismounting collision, friction and abrasion and the like after being used for a period of time; the most main reason for the rejection of the drill rod is the abrasion of threads at joints among a plurality of drill rods, and the severe abrasion of the threads can cause the untight connection and the unreliable connection of the drill rods.
In addition, in order to prevent water leakage at the drill rod connection, a sealing ring is usually sleeved at the connection thread. After long-term use, the sealing ring is easy to be worn, so that the problems of poor sealing and water leakage are caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a shallow thread wear-resistant high-pressure drill pipe connecting structure for a coal mine, which avoids the problem of water leakage of a drill pipe connecting part caused by the loss of a sealing ring by changing the installation mode of the sealing ring.
The utility model adopts the following technical scheme: a shallow thread wear-resistant high-pressure drill rod connecting structure for a coal mine comprises an external thread section and an internal thread section;
the external thread section is arranged at the front end of the first drill rod, and the internal thread section is arranged at the rear end of a second drill rod connected with the front end of the first drill rod;
a sealing groove is formed in the first diameter surface/the second diameter surface of the first drill rod/the second drill rod, a sealing ring is arranged in the sealing groove, and the sealing ring is used for sealing the connecting part of the first drill rod and the second drill rod so as to prevent high-pressure water in the water inlet channel inside the first drill rod and the second drill rod from leaking;
the first diameter surface is an exposed cross section between the external thread section and the outer surface of the first drill rod, and the second diameter surface is an exposed cross section between the internal thread section and the outer surface of the second drill rod.
Furthermore, the diameter of the external thread section is reduced from back to front, and the diameter of the internal thread section is reduced from back to front.
Further, the external thread section and the internal thread section are equal in length.
Furthermore, a first limit shoulder is arranged between the external thread section and the first diametric plane;
and a second limit shoulder matched with the first limit shoulder is arranged between the internal thread section and the second diameter surface.
Furthermore, the seal groove is a circular groove, and the seal ring is a circular pad.
Further, the outer surfaces of the first drill rod and the second drill rod are provided with spiral grooves, the spiral grooves extend from the front end of the first drill rod/the rear end of the first drill rod/the second drill rod, and the number of the spiral grooves in the first drill rod and the second drill rod is not less than two.
The utility model has the beneficial effects that: according to the utility model, the sealing grooves are formed on the first diameter surface/the second diameter surface of the first drill rod/the second drill rod, and the sealing ring is arranged in the sealing groove, so that the sealing ring can be prevented from being exposed on the outer surfaces of the first drill rod and the second drill rod, and the sealing ring is protected.
Drawings
FIG. 1 is a schematic structural diagram of a shallow thread wear-resistant high-pressure drill pipe connection structure for a coal mine according to an embodiment of the utility model;
FIG. 2 is a schematic structural diagram of a shallow thread wear-resistant high-pressure drill pipe connecting structure for a coal mine according to another embodiment of the utility model;
fig. 3 is an external structural view of a drill rod body according to an embodiment of the present invention.
Wherein: 1. an external threaded section; 2. a sealing groove; 3. a first limit shoulder; 4. an internal thread section; 5. a second limit shoulder; 6. a water inlet channel; 7. a first drill rod; 8. a second drill pipe; 9. a spiral groove; 10. a first diametric plane; 11. a second diametric plane.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
In coal mine drilling, a threaded connection part of a drill rod is not provided with a sealing device generally, and when the drill rod needs to be pressurized to work, high-pressure water jet flow in the drill rod leaks from the connection part of the drill rod, so that the high-pressure water pressure in a drill bit needing high-pressure work is insufficient.
The utility model discloses a shallow thread wear-resistant high-pressure drill rod connecting structure for a coal mine, which comprises an external thread section 1 and an internal thread section 4 as shown in figures 1 and 2; the external thread section 1 is arranged at the front end of a first drill rod 7, and the internal thread section 4 is arranged at the rear end of a second drill rod 8 connected with the front end of the first drill rod 7; a sealing groove 2 is formed in the first diameter surface 10/the second diameter surface 11 of the first drill rod 7/the second drill rod 8, a sealing ring is arranged in the sealing groove 2, and the sealing ring is used for sealing the connecting part of the first drill rod and the second drill rod so as to prevent high-pressure water in the water inlet channel 6 inside the first drill rod 7 and the second drill rod 8 from leaking out; the first diametric surface 10 is an exposed cross section between the external thread section 1 and the outer surface of the first drill rod 7, and the second diametric surface 11 is an exposed cross section between the internal thread section 4 and the outer surface of the second drill rod 8.
According to the utility model, the sealing grooves 2 are arranged on the first diameter surface 10/the second diameter surface 11 of the first drill rod 7/the second drill rod 8, and the sealing rings are arranged in the sealing grooves 2, so that the sealing rings can be prevented from being exposed on the outer surfaces of the first drill rod 7 and the second drill rod 8, the sealing rings are protected, in addition, the mounting difficulty of the sealing rings is reduced by arranging the sealing rings in the sealing grooves 2, the path length of high-pressure water leakage is prolonged, and the high-pressure water is further ensured not to leak.
In the embodiment of the utility model, the diameter of the external thread section 1 is reduced from back to front, and the diameter of the internal thread section 4 is reduced from back to front. By the aid of the threads in the mode, the drill rods can be screwed more tightly in the connection process, and the connection strength of the drill rods is increased.
The external thread section 1 and the internal thread section 4 are equal in length, so that the first drill rod 7 and the second drill rod 8 which are connected with each other can be fully connected, the connection length is lengthened, and the impact force of high-pressure water to the outside of the connection part is further reduced.
In the embodiment of the utility model, a first limit shoulder 3 is arranged between the external thread section 1 and the first diametric surface 10; and a second limit shoulder 5 matched with the first limit shoulder 3 is arranged between the internal thread section 4 and the second diameter surface 11. The first limit shoulder 3 and the second limit shoulder 5 have the same cross-sectional shape, and one limit shoulder protrudes and is recessed. When the first drill rod 7 and the second drill rod 8 are tightened, they abut against each other. In this embodiment, the cross-section of first spacing shoulder 3 and the spacing shoulder 5 of second all designs for circularly, convenient operation, and in addition, when external thread section 1 and internal thread section 2 were twisted to certain extent, first spacing shoulder 3 can stretch into the spacing shoulder 5 of second in, can avoid the screw thread dislocation of screw thread tightening process.
As a most preferred embodiment, when high-pressure water leaks, the high-pressure water needs to flow out around the gap between the sealing ring and the sealing groove 2, in the process, the path through which the high-pressure water flows is lengthened, and in addition, the plugging of the leaked high-pressure water can be completed only by the fact that one sealing ring is attached and sealed with the sealing groove 2 on the path, so that the leakage probability of the high-pressure water is greatly reduced.
Because the common sealing rings on the market are all ring-shaped sealing rings, in order to reduce cost and facilitate purchase, the sealing groove 2 is a ring-shaped groove, and the sealing rings are ring-shaped gaskets.
In addition, in the coal mine drilling, the drill rod is locked in a softer coal bed due to hole collapse or excessive coal slag accumulation in the hole, so that the drill rod cannot exit the drill hole, and only part of the locked drill rod in the hole can be abandoned. The main reason for losing part of the drill rod due to locking of the drill rod is that the drill rod has a smooth outer diameter and is not beneficial to drilling and deslagging.
Therefore, as shown in fig. 3, the outer surfaces of the first drill rod 7 and the second drill rod 8 are both provided with spiral grooves 9, the spiral grooves 9 extend from the front end of the first drill rod 7/the second drill rod 8 to the rear end thereof, and the extending path surrounds the first drill rod 7/the second drill rod 8. Furthermore, the number of the spiral grooves 9 on the first drill rod 7 and the second drill rod 8 is not less than two, i.e., at least two. The spiral groove 9 may have a circular arc-shaped cross section to discharge water and slag together. The spiral groove 9 is designed to be spiral so as to increase the drainage force in the process that the drill rod rotates along with the drilling machine, so that water and slag are discharged to the outside along the spiral groove 9 after receiving the rotating force.
Claims (5)
1. A shallow thread wear-resistant high-pressure drill rod connecting structure for a coal mine is characterized by comprising an external thread section (1) and an internal thread section (4);
the external thread section (1) is arranged at the front end of a first drill rod (7), and the internal thread section (4) is arranged at the rear end of a second drill rod (8) connected with the front end of the first drill rod (7);
a sealing groove (2) is formed in a first diameter surface (10)/a second diameter surface (11) of the first drill rod (7)/the second drill rod (8), a sealing ring is arranged in the sealing groove (2), and the sealing ring is used for sealing the connecting part of the first drill rod and the second drill rod so as to prevent high-pressure water in a water inlet channel (6) inside the first drill rod (7) and the second drill rod (8) from leaking;
the first diameter surface (10) is an exposed cross section between the external thread section (1) and the outer surface of the first drill rod (7), and the second diameter surface (11) is an exposed cross section between the internal thread section (4) and the outer surface of the second drill rod (8);
spiral grooves (9) are formed in the outer surfaces of the first drill rod (7) and the second drill rod (8), the spiral grooves (9) extend from the front end of the first drill rod (7)/the rear end of the second drill rod (8) to the rear end of the first drill rod (7)/the second drill rod (8), and the number of the spiral grooves (9) in the first drill rod (7) and the second drill rod (8) is not less than two.
2. The shallow thread wear-resistant high-pressure drill pipe connection structure for the coal mine is characterized in that the diameter of the external thread section (1) is reduced from back to front, and the diameter of the internal thread section (4) is reduced from back to front.
3. The shallow thread wear-resistant high-pressure drill pipe connection structure for the coal mine as claimed in claim 2, characterized in that the length of the external thread section (1) and the internal thread section (4) is equal.
4. A shallow thread wear-resistant high-pressure drill pipe connection for coal mines as claimed in claim 3, wherein a first limit shoulder (3) is provided between the external thread section (1) and the first diametric surface (10);
and a second limit shoulder (5) matched with the first limit shoulder (3) is arranged between the internal thread section (4) and the second diameter surface (11).
5. The shallow thread wear-resistant high-pressure drill pipe connecting structure for the coal mine as claimed in claim 4, wherein the sealing groove (2) is an annular groove, and the sealing ring is an annular pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120361765.3U CN215369730U (en) | 2021-02-09 | 2021-02-09 | Shallow thread wear-resistant high-pressure drill rod connecting structure for coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120361765.3U CN215369730U (en) | 2021-02-09 | 2021-02-09 | Shallow thread wear-resistant high-pressure drill rod connecting structure for coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215369730U true CN215369730U (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120361765.3U Active CN215369730U (en) | 2021-02-09 | 2021-02-09 | Shallow thread wear-resistant high-pressure drill rod connecting structure for coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215369730U (en) |
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2021
- 2021-02-09 CN CN202120361765.3U patent/CN215369730U/en active Active
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