CN114439372B - Self-propelled drilling hole repairing device capable of hydraulic hole making in drilling hole - Google Patents
Self-propelled drilling hole repairing device capable of hydraulic hole making in drilling hole Download PDFInfo
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- CN114439372B CN114439372B CN202210084164.1A CN202210084164A CN114439372B CN 114439372 B CN114439372 B CN 114439372B CN 202210084164 A CN202210084164 A CN 202210084164A CN 114439372 B CN114439372 B CN 114439372B
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- hard pipeline
- cavity
- nozzle
- deviation rectifying
- self
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/10—Correction of deflected boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
Abstract
The invention belongs to the technical field of mine gas extraction, and particularly discloses a self-propelled borehole restoration device capable of making a cave through hydraulic power in a borehole, which comprises a high-pressure water pump and a high-pressure hose connected with the outlet of the high-pressure water pump, wherein the tail end of the high-pressure hose is provided with a hard pipeline, the tail end of the hard pipeline is provided with a self-propelled rotary drill bit, the high-pressure hose is arranged on a pipe winder, the front section of the high-pressure hose is provided with a rear nozzle for providing power and a deviation rectifying cavity for preventing the hard pipeline from rotating and is connected with the drill bit, the middle section of the high-pressure hose is provided with a stable balance cavity and a ball bearing, the pipe wall of the rear section of the high-pressure hose is thickened and made of a high-density tungsten alloy material; the device is connected with the hard pipeline with the balancing device at the drill bit, so that the drill bit can be prevented from falling and deflecting when passing through hydraulic hole making, and the normal operation of repairing the hole at the drilling hydraulic hole making position is ensured.
Description
Technical Field
The invention belongs to the technical field of mine gas extraction, and particularly relates to a self-propelled borehole restoration device capable of hydraulic cave creation in a borehole.
Background
Coal bed gas (gas) is used as a clean energy source, and coal bed gas mining can not only promote the implementation of energy strategy in China, but also reduce the occurrence of coal mining accidents. The low-permeability coal seam mine usually adopts a hydraulic punching hole-making technology to improve the gas permeability, and adopts a hydraulic hole-making pressure-relief permeability-increasing technology to enable the pores and cracks of coal around a drill hole to develop, improve the coal seam gas permeability and the gas extraction efficiency and realize the rapid and efficient extraction of coal seam gas. Coal seams in China are mostly in soft zones with high adsorption and low permeability, and are easily affected by ground stress and external disturbance to cause hole collapse and hole blocking. With the increase of the mining depth of a mine, the phenomenon of hole blocking frequently occurs in recent years, the gas extraction efficiency is influenced, and the implementation of the energy strategy in China is severely restricted. The guarantee of smoothness of the gas channel is an important method for improving the gas extraction efficiency, re-drilling is high in cost and long in time consumption, hole stringing is easily caused due to equipment limitation, and the gas extraction difficulty is increased. And removing the blocked rock blocks and coal slag in the hole, repairing the drilled hole, and recovering the extraction capability of the drilled hole is a technical means for ensuring the gas extraction efficiency.
At present, most drilling hole repairing means use high-pressure gas or high-pressure water as hole repairing power to carry out drilling hole repairing, but the current hole repairing equipment has poor adaptability to drilling hole environments and does not accord with actual engineering environments. When the drill hole with hydraulic cave is repaired, as most of hydraulic cave radiuses are between 0.3m and 0.6m, the common drill hole repairing device can not build the cave through hydraulic cave, and when the hydraulic cave is built, the pipeline can not bear the self weight of the drill bit, the drill bit can deviate downwards and fall, and the drill hole can not be repaired continuously. How to ensure that a drill normally performs hydraulic hole making, continuously remove large rock blocks and coal cinder caused by hole collapse and recover the extraction capacity of a drilled hole is an important premise for ensuring effective repair of the drilled hole and efficient extraction of gas.
Disclosure of Invention
The invention aims to provide a self-advancing drilling hole repairing device capable of making a hole through hydraulic power in a drilling hole, and solves the problem that a drill bit is deflected downwards and falls off and cannot smoothly pass through the hydraulic power making hole due to the fact that the hydraulic power making hole is formed when the drilling hole of a low-permeability coal seam is repaired at present.
In order to achieve the purpose, the invention adopts the technical scheme that:
a self-advancing drilling hole repairing device capable of achieving hydraulic hole making in a drilling hole comprises a high-pressure water pump and a high-pressure hose connected with an outlet of the high-pressure water pump, wherein a hard pipeline is arranged at the tail end of the high-pressure hose, a self-advancing rotary drill bit is arranged at the tail end of the hard pipeline, and the high-pressure hose is arranged on a pipe coiling device.
Further, the hard pipeline is divided into a front section, a middle section and a rear section, the front section, the middle section and the rear section are connected through threads, a deviation rectifying cavity and a reverse nozzle are arranged on the front section hard pipeline, a stable balance cavity is arranged on the middle section hard pipeline, and the wall of the rear section hard pipeline is thickened and made of high-density tungsten alloy materials.
Further, the deviation rectifying cavity comprises a deviation rectifying shell positioned outside the front section hard pipeline, the center of the deviation rectifying shell is provided with a partition plate, the top of the partition plate is fixedly connected with the top of the cavity, the bottom of the partition plate is fixedly connected with the outer wall of the front section hard pipeline, the deviation rectifying shell is divided into a left cavity and a right cavity by the partition plate, the left cavity and the right cavity are respectively communicated with the fluid in the hard pipeline through a left channel and a right channel arranged on the front section hard pipeline, the side surface of the top of the left cavity is provided with a left deviation rectifying nozzle, the side wall of the top of the right cavity is provided with a right deviation rectifying nozzle, the left deviation rectifying nozzle and the right deviation rectifying nozzle are symmetrically arranged, the left deviation rectifying nozzle is communicated with the left deviation rectifying channel, the right deviation rectifying nozzle is communicated with the right deviation rectifying channel, a left limiting slide way is arranged below the left deviation rectifying nozzle channel in the left cavity, and a right limiting slide way is arranged below the right deviation rectifying nozzle channel in the right cavity, be equipped with the clearance between every spacing slide and the division board, all be equipped with a high density tungsten alloy slider in every spacing slide, be connected through compression spring between high density tungsten alloy slider and the casing of rectifying, the passageway intercommunication on the anterior segment stereoplasm pipeline when the high density tungsten alloy slider of the passageway of rectifying in its place side slides to the casing compression of rectifying, the setting of the chamber of rectifying can guarantee when stereoplasm pipeline anticlockwise rotation exceeds 30, left side metal slider compression spring, slide left, the nozzle intercommunication of rectifying in the left side, jet the water efflux left, provide the effort and correct the pipeline right, when stereoplasm pipeline clockwise rotation exceeds 30, right side metal slider compression spring slides right, the nozzle intercommunication of rectifying in the right side, jet the water efflux right, provide the effort of rectifying left, ensure that the chamber of rectifying is located the pipeline top.
Further, the stable balance cavity comprises a balance shell located outside the middle-section hard pipeline and a high-density tungsten alloy sliding block located in the balance shell, two ends of the high-density tungsten alloy sliding block are fixedly connected with the inner walls of the left side and the right side of the balance shell through compression springs, a stable nozzle with an upward opening is arranged at each of the front end and the rear end of the top of the balance shell, the stable nozzle is plugged by the high-density tungsten alloy sliding block when the high-density tungsten alloy sliding block is located in the middle of the balance shell, a through hole is respectively formed in each of the front end and the rear end of the middle-section hard pipeline where the balance shell is located, the stable nozzle is communicated with the through hole far away from the high-density tungsten alloy sliding block when the high-density tungsten alloy sliding block slides, the stable balance cavity is arranged to ensure that when a drill bit passes through the hydraulic cavity and falls downwards, the stable balance cavity inclines by more than 25 degrees, the sliding block slides forwards, the rear end of the stable nozzle is communicated with the rear end of the stable nozzle, water jet is upwards jetted to provide downward acting force to stabilize the pipeline, and when the hard pipeline runs stably, the hard alloy sliding block is sealed nozzle under the stable action of the stable spring.
Furthermore, the deviation rectifying cavity, the stable balance cavity and the hard pipeline are integrally formed, and the arrangement mode ensures the sealing performance of the hard pipeline.
Further, the self-propelled rotary drill bit includes the rotary seal ware of being connected with anterior segment stereoplasm body end, (rotary seal ware's structure reference application number is 2021211022048 patent discloses the rotator structure) and with rotary seal ware fixed connection's rotary drill bit, be equipped with a center nozzle and two side nozzles on the rotary drill bit, two side nozzle symmetry sets up, and every side nozzle is 20 with rotary drill bit's center pin contained angle, provides the moment of torsion for the drill bit is rotatory.
Furthermore, the both ends of middle section stereoplasm pipeline all are equipped with O shape sealing washer with anterior segment stereoplasm pipeline and back end stereoplasm pipeline junction, the weight of stereoplasm pipeline is the same with self-advancing formula rotary drill weight, and stereoplasm pipeline and self-advancing formula rotary drill total length are 2.4m, ensure that the focus does not get into hydraulic power cave when the drill bit is through hydraulic power cave, and the drill bit has passed through smoothly when the focus passes through hydraulic power cave.
Further, the bottom of the middle-section hard pipeline where the stable balance cavity is located is provided with a ball bearing, the center of the ball bearing and the center of the stable balance cavity are located on the same line, the ball bearing can reduce the friction force of the hard pipeline on one hand, and on the other hand, the ball bearing can provide a fulcrum for the stable balance cavity so as to judge whether the stable balance cavity is balanced or not.
Furthermore, the number of the reverse nozzles is two, and the included angle between the spraying direction of the reverse nozzles and the axial core of the self-propelled rotary drill bit is 20 degrees.
The invention has the advantages that:
1. the device is characterized in that a hard pipeline is connected behind a drill bit, and the rear section of the hard pipeline is made of high-density tungsten alloy, so that the center of gravity of the whole hard pipeline and the drill bit is positioned in the middle section of the hard pipeline;
2. when the drill bit falls and deviates downwards, the stable balance cavity can maintain the stability of the drill bit by utilizing the impact power of the water jet;
3. when the hard pipeline rotates, the deviation rectifying cavity can be corrected by using impact power of the water jet, and the stable balancing cavity is ensured to be positioned above the hard pipeline;
4. the device can ensure that the drill bit smoothly passes through hydraulic hole making in the drill hole and continuously removes large rock blocks and coal cinder caused by hole collapse;
5. the ball bearing at the middle section of the hard pipeline of the device is superposed with the integral gravity center, so that the friction force between the hard pipeline and the hole wall can be reduced, and the ball bearing is used as a fulcrum to assist in correcting the deviation of the stable balance cavity;
6. the jet flow formed by the rear nozzle at the front end of the hard pipeline can provide forward power for the drill bit and clean broken coal cinder.
Drawings
FIG. 1 is a state of use reference diagram of the present invention;
FIG. 2 is a cross-sectional view of a hard tube and a self-propelled rotary drill bit according to the present invention;
FIG. 3 is a schematic side-view nozzle position of the self-advancing rotary drill bit of the present invention;
FIG. 4 is a cross-sectional view of a mid-section rigid conduit according to the present invention;
fig. 5 is a sectional view of a front end hard tube according to the present invention.
Detailed Description
As shown in the figure, the self-advancing type drilling hole repairing device capable of hydraulic cave creation in a drilling hole comprises a high-pressure water pump 1 and a high-pressure hose 2 connected with the outlet of the high-pressure water pump 1, wherein a hard pipeline 3 is arranged at the tail end of the high-pressure hose 2, a self-advancing type rotary drill bit 4 is arranged at the tail end of the hard pipeline 3, and the high-pressure hose 2 is arranged on a pipe coiling device 5; the hard pipeline 3 is divided into a front section, a middle section and a rear section, the front section, the middle section and the rear section are connected through threads, a deviation rectifying cavity 6 and two reverse nozzles 7 are arranged on the front section hard pipeline 31, an included angle between the injection direction of the reverse nozzles and the shaft core of the self-propelled rotary drill bit is 20 degrees, a stable balance cavity 8 is arranged on the middle section hard pipeline 32, the pipe wall of the rear section hard pipeline 33 is thickened, and high-density tungsten alloy materials are used; the deviation correcting cavity comprises a deviation correcting shell 61 positioned outside the front section hard pipeline, a partition plate 62 is arranged at the center of the deviation correcting shell, the top of the partition plate 62 is fixedly connected with the top of the cavity body, the bottom of the partition plate is fixedly connected with the outer wall of the front section hard pipeline, the deviation correcting shell is divided into a left cavity and a right cavity by the partition plate 62, the left cavity and the right cavity are respectively communicated with the fluid in the hard pipeline through a left channel 63 and a right channel 64 which are arranged on the front hard pipeline, the side surface of the top of the left cavity is provided with a left deviation correcting nozzle 65, the side wall of the top of the right cavity is provided with a right deviation correcting nozzle 66, the left deviation correcting nozzle 65 and the right deviation correcting nozzle 66 are symmetrically arranged, the left deviation correcting nozzle 65 is communicated with the left deviation correcting channel, the right deviation correcting nozzle 66 is communicated with the right deviation correcting channel, a left limiting slide way is arranged below the left deviation correcting nozzle channel in the left cavity, a right limiting slide way is arranged below the right deviation correcting nozzle channel in the right cavity, a gap is arranged between each limiting slide way and the partition plate, and a high-density tungsten alloy slide block 9 is arranged in each limiting slide way, the high-density tungsten alloy sliding block is connected with the deviation rectifying shell through a compression spring 10, the high-density tungsten alloy sliding block on the deviation rectifying channel on the side is communicated with a channel on the front section hard pipeline when the high-density tungsten alloy sliding block slides towards the deviation rectifying shell in a compression mode, the deviation rectifying cavity is arranged to ensure that when the hard pipeline rotates anticlockwise by more than 30 degrees, the left metal slide block compresses the spring, slides leftwards, the left deviation rectifying nozzle is communicated, water jet flow is ejected leftwards to provide right acting force to rectify the pipeline, when the hard pipeline rotates clockwise by more than 30 degrees, the right metal slide block compresses the spring and slides rightwards, the right deviation rectifying nozzle is communicated, water jet flow is jetted rightwards, leftward acting force is provided to rectify the pipeline, and the deviation rectifying cavity is ensured to be positioned above the pipeline.
Further, the stable balance cavity 8 comprises a balance shell 81 located outside the middle-section hard pipeline 32 and a high-density tungsten alloy sliding block 9 located inside the balance shell, two ends of the high-density tungsten alloy sliding block 9 are fixedly connected with the inner walls of the left side and the right side of the balance shell 81 through compression springs 10, a stable nozzle 82 with an upward opening is respectively arranged at the front end and the rear end of the top of the balance shell 81, the stable nozzle 82 is plugged by the high-density tungsten alloy sliding block when the high-density tungsten alloy sliding block is located in the middle of the balance shell, a through hole 321 is respectively arranged at the front end and the rear end of the middle-section hard pipeline 32 where the balance shell is located, the stable nozzle 82 is communicated with the through hole 321 far away from the high-density tungsten alloy sliding block when the high-density tungsten alloy sliding block 9 slides, the stable balance cavity 8 can ensure that when a drill bit falls through a hydraulic cavity and falls downwards, the stable balance cavity inclines more than 25 degrees, the sliding block slides forwards, the rear-end stable nozzle is communicated with an upward jet water jet flow to provide a downward acting force to stabilize the hard pipeline, when the hard pipeline falls through the hydraulic cavity and falls downwards, the stable nozzle is communicated with the middle-section hard pipeline, the stable nozzle 81 is provided with a stable rubber layer 83, and the stable spring to seal the high-jet water jet to seal the high-density tungsten alloy sliding block when the middle-flow channel is located in the middle-flow seal shell, the high-seal shell; the deviation rectifying cavity 6 and the stable balance cavity 8 are integrally formed with the hard pipeline 1, and the arrangement mode ensures the sealing performance of the connection part. The self-propelled rotary drill bit 4 comprises a rotary sealer 41 connected with the tail end of a front section hard pipe body, (the structure of the rotary sealer refers to a rotary body structure disclosed in the patent with the application number of 2021211022048), and a rotary drill bit 42 fixedly connected with the rotary sealer 41, wherein a central nozzle 421 and two side nozzles 422 are arranged on the rotary drill bit 42, the two side nozzles 422 are symmetrically arranged, and the included angle between each side nozzle and the central shaft of the rotary drill bit is 20 degrees, so that torque is provided for the rotation of the drill bit; middle section stereoplasm pipeline both ends all are equipped with O shape sealing washer 12 with anterior segment stereoplasm pipeline and back end stereoplasm pipeline junction, the weight of stereoplasm pipeline is the same with self-advancing rotary drill weight, and stereoplasm pipeline and self-advancing rotary drill total length are 2.4m, ensure that the focus does not get into hydraulic power and make cave when the drill bit is through hydraulic power making cave, and the drill bit has passed through smoothly when the focus is through hydraulic power making cave, the middle section stereoplasm pipeline bottom at stable balanced chamber 8 place is equipped with a ball bearing 11, ball bearing 11 center lies in same line with stable balanced chamber 8 center, and ball bearing can reduce the frictional force of stereoplasm pipeline on the one hand, and on the other hand can provide a fulcrum for stable balanced chamber and be convenient for judge its is balanced.
Claims (6)
1. The utility model provides an accessible is water conservancy in drilling and is made cave from marching type drilling prosthetic devices which characterized in that: the high-pressure hose pipe type pipe coiling device comprises a high-pressure water pump and a high-pressure hose connected with an outlet of the high-pressure water pump, wherein a hard pipeline is arranged at the tail end of the high-pressure hose, a self-advancing rotary drill bit is arranged at the tail end of the hard pipeline, and the high-pressure hose is arranged on a pipe coiling device; the hard pipeline is divided into a front section, a middle section and a rear section, the front section, the middle section and the rear section are connected through threads, a deviation rectifying cavity and a reverse nozzle are arranged on the front section hard pipeline, a stable balancing cavity is arranged on the middle section hard pipeline, the pipe wall of the rear section hard pipeline is thickened, and a high-density tungsten alloy material is used; the deviation rectifying cavity comprises a deviation rectifying shell positioned outside the front-section hard pipeline, a partition plate is arranged in the center of the deviation rectifying shell, the top of the partition plate is fixedly connected with the top of a cavity, the bottom of the partition plate is fixedly connected with the outer wall of the front-section hard pipeline, the deviation rectifying shell is divided into a left cavity and a right cavity which are symmetrical to each other, the left cavity and the right cavity are respectively communicated with fluid in the hard pipeline through a left channel and a right channel which are arranged on the front-section hard pipeline, a left deviation rectifying nozzle is arranged on the side surface of the top of the left cavity, a right deviation rectifying nozzle is arranged on the side wall of the top of the right cavity, the left deviation rectifying nozzle and the right deviation rectifying nozzle are symmetrically arranged, the left deviation rectifying nozzle is communicated with the left deviation rectifying channel, a left limiting slide way is arranged below the left deviation rectifying nozzle channel in the left cavity, a right limiting slide way is arranged below the right deviation nozzle channel in the right cavity, a gap is arranged between each limiting slide way and the partition plate, a high-density tungsten alloy slide block is arranged in each limiting slide way, the high-density tungsten slide block is connected with the deviation rectifying shell through a compression spring, and the deviation rectifying channel is communicated with a channel on the hard pipeline when the high-density tungsten block on the side of the deviation rectifying channel is compressed and slides towards the shell; stabilize balanced chamber including being located the outer balanced casing of middle section hard tube to and be located the high density tungsten alloy slider of balanced casing, high density tungsten alloy slider both ends are through compression spring and balanced casing left and right sides inner wall fixed connection, both ends are equipped with an ascending stable nozzle of opening respectively around the balanced casing top, stabilize the nozzle and be located the shutoff of balanced casing middle time by high density tungsten alloy slider when high density tungsten alloy slider, both ends are equipped with a through-hole respectively around on the middle section hard tube at balanced casing place, stabilize the nozzle when high density tungsten alloy slider slides and keep away from the through-hole UNICOM of high density tungsten alloy slider.
2. A self-propelled borehole rehabilitation apparatus for enabling hydraulic cavitation in a borehole as recited in claim 1, wherein: the deviation rectifying cavity, the stable balance cavity and the hard pipeline are integrally formed.
3. A self-propelled borehole rehabilitation apparatus for enabling hydraulic cavitation in a borehole, as recited in claim 2, wherein: self-propelled rotary drill includes the rotary sealer with anterior segment stereoplasm body end-to-end connection to and rotary drill fixed connection's rotary drill, last one center nozzle and two side nozzles of being equipped with of rotary drill, two side nozzle symmetries set up, and every side nozzle is 20 with rotary drill's center pin contained angle.
4. A self-propelled borehole rehabilitation apparatus for hydraulic cavitation in a borehole as recited in claim 3 wherein: the hard pipeline comprises a middle section hard pipeline and a rear section hard pipeline, wherein the middle section hard pipeline is connected with the front section hard pipeline through a self-propelled rotary drill bit, and the rear section hard pipeline is connected with the rear section hard pipeline through a self-propelled rotary drill bit.
5. The self-propelled borehole rehabilitation apparatus via hydraulic cave-in-borehole of claim 4, wherein: the bottom of the middle-section hard pipeline where the stable balance cavity is located is provided with a ball bearing, and the center of the ball bearing and the center of the stable balance cavity are located on the same line.
6. The self-propelled borehole rehabilitation apparatus via hydraulic cavitation in a borehole of claim 5, wherein: the two reverse nozzles are arranged, and the included angle between the spraying direction of the reverse nozzles and the shaft core of the self-propelled rotary drill bit is 20 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210084164.1A CN114439372B (en) | 2022-01-25 | 2022-01-25 | Self-propelled drilling hole repairing device capable of hydraulic hole making in drilling hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210084164.1A CN114439372B (en) | 2022-01-25 | 2022-01-25 | Self-propelled drilling hole repairing device capable of hydraulic hole making in drilling hole |
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| Publication Number | Publication Date |
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| CN114439372A CN114439372A (en) | 2022-05-06 |
| CN114439372B true CN114439372B (en) | 2023-03-17 |
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| CN202210084164.1A Active CN114439372B (en) | 2022-01-25 | 2022-01-25 | Self-propelled drilling hole repairing device capable of hydraulic hole making in drilling hole |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7686101B2 (en) * | 2001-11-07 | 2010-03-30 | Alice Belew, legal representative | Method and apparatus for laterally drilling through a subterranean formation |
| KR101426344B1 (en) * | 2012-12-06 | 2014-08-06 | (주)삼일이엔씨 | Drill bit for preventing going out of commission and usage method thereof |
| CN103541658B (en) * | 2013-11-04 | 2015-09-09 | 上海隧道工程股份有限公司 | A kind of antipriming pipe horizontal jet grouting drill bit |
| CN206338031U (en) * | 2016-12-07 | 2017-07-18 | 河南理工大学 | A kind of underground self-advancing type high-pressure abrasive material gas jet drilling prosthetic device |
| CN113153156B (en) * | 2021-05-21 | 2023-03-17 | 河南理工大学 | Hydraulic combined mechanical hole repairing device and method |
| CN214697699U (en) * | 2021-05-21 | 2021-11-12 | 河南理工大学 | Hole repairing device for hydraulic combined machine |
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2022
- 2022-01-25 CN CN202210084164.1A patent/CN114439372B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 刘勇 ; 梁博臣 ; 何岸 ; 魏建平 ; .自进式旋转钻头钻孔修复理论及关键参数研究.2016,(第02期),第39-44页. * |
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