CN111720059A - Flexible reaming device and method - Google Patents
Flexible reaming device and method Download PDFInfo
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- CN111720059A CN111720059A CN202010744663.XA CN202010744663A CN111720059A CN 111720059 A CN111720059 A CN 111720059A CN 202010744663 A CN202010744663 A CN 202010744663A CN 111720059 A CN111720059 A CN 111720059A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 43
- 239000003245 coal Substances 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 239000007769 metal material Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 8
- 238000005065 mining Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- 229910004534 SiMn Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
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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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of coal mine drilling, in particular to a flexible reaming device and a method, the flexible reaming device comprises a drill rod, a reaming seat and a drill bit, wherein two ends of the reaming seat are respectively connected with the drill bit and the drill rod, one end of the drill rod, which is far away from the reaming base, is in transmission connection with a speed reducing motor, a flexible reaming chain or cable is arranged on the reaming base, the flexible reaming chain or cable is made of high-strength wear-resistant metal materials, high-pressure hoses are arranged in the flexible reaming chains or cables in a penetrating way, high-pressure water channels communicated with each other are arranged in the drill rod and the reaming base, the high-pressure hose is communicated with the high-pressure water channel, one end of the high-pressure hose, which is far away from the reaming base, is opened or closed, the flexible reaming device is utilized to ream the common drilled holes of the coal mine, the reliability of the reaming device can be improved, the reaming cost is reduced, and the reaming efficiency of coal mine drilling is ensured.
Description
Technical Field
The invention belongs to the technical field of coal mine drilling, and particularly relates to a flexible reaming device and a flexible reaming method.
Background
Before coal mine collection, a hole needs to be drilled for gas extraction, a hole needs to be drilled from a rock layer to a coal seam during drilling, and in order to save drilling cost and increase gas extraction efficiency, the hole needs to be reamed under the condition that the hole diameter of a rock layer drilling section is not changed, so that the surface area of an inner hole of the coal seam is enlarged, and the gas overflow efficiency is improved.
Chinese patent document CN201810392039.0 discloses a soil layer variable diameter mechanical reaming bit and a drilling method using the same, wherein torque is transmitted through the bit and a transmission rod, and a reaming telescopic arm is folded when the bit is not stressed, so that small diameter drilling can be conveniently performed; when the reamer enters the bottom of the hole, pressure is applied through the transmission rod, the reaming telescopic arm is outwards opened, and the second connecting rod inlaid with the alloy particles 5 is used as the reaming arm to cut the wall of the hole after rotating along with the transmission rod to form reaming. The diameter of the reaming hole can be adjusted by controlling the telescopic length of the reducing control rod. After the reaming section is constructed, the whole body retreats backwards, the two opened connecting rods automatically fold and straighten under the friction action of the hole wall, and the whole diameter is reduced, so that the hole can be smoothly retreated out of the hole from the non-reaming section. There is also the reaming bit that drives the reaming arm through hydraulic support and stretch out and draw back in the market, but among the prior art, the reaming effect of setting up of reaming arm is not ideal, and the stress that the connecting portion of reaming arm and drilling rod received at the reaming in-process is great, easy fatigue damage, and when reaming arm shrink easily and between the drilling rod centre gripping bold coal grain, lead to the shrink not in place, the influence moves back to bore, increases the reaming cost, and can't guarantee the reaming efficiency of construction of drilling.
Therefore, a new flexible reaming device and a new flexible reaming method are needed to improve the reliability of the reaming device, reduce the reaming cost and ensure the reaming efficiency of coal mine drilling.
Disclosure of Invention
In order to solve the technical problem, the invention provides a flexible reaming device which comprises a drill rod, a reaming seat and a drill bit, wherein two ends of the reaming seat are respectively connected with the drill bit and the drill rod, one end, far away from the reaming seat, of the drill rod is in transmission connection with a speed reduction motor, a flexible reaming chain or a flexible reaming cable is arranged on the reaming seat, the flexible reaming chain or the flexible reaming cable is made of high-strength wear-resistant metal materials, the high-strength wear-resistant metal materials can be 27SiMn materials, and the flexible reaming device is high in strength and good in wear resistance. And high-pressure hoses penetrate through the flexible reaming chains or the cables, the cables are made of a plurality of strands of steel wires made of wear-resistant alloy steel materials and stranded outside the high-pressure hoses, high-pressure water channels communicated with each other are arranged in the drill rods and the reaming seats, the high-pressure hoses are communicated with the high-pressure water channels, and one ends, far away from the reaming seats, of the high-pressure hoses are opened or closed.
Preferably, the flexible reaming chain adopts a mining high-strength round-link chain, the freedom degree of each chain link of the mining high-strength round-link chain is high, the problem of coal accumulation between the mining high-strength round-link chain and the reaming base can be avoided, and a high-pressure hose is conveniently penetrated.
Preferably, the high-pressure hose is an armored metal hose, so that the service life of the high-pressure hose is guaranteed.
Preferably, the outer surfaces of the reaming base and the drill rod are provided with spiral guide chutes, so that broken coal particles can be conveniently and timely conveyed out of drilled holes during reaming, and the reaming efficiency is ensured.
Preferably, the drilling rod is in threaded connection with the reaming base, the connecting end of the reaming base and the drill bit is correspondingly provided with matched concave-convex connecting parts, and the reaming base is fixedly connected with the concave-convex connecting parts of the drill bit through bolts, so that the reliability of connection of the drill bit is guaranteed.
Preferably, still be equipped with the diamond compact piece on flexible reaming chain or the cable, be favorable to prolonging the life of flexible reaming chain or cable to improve reaming efficiency. Set up the one end that flexible reaming chain or cable kept away from the reaming seat with the diamond compact piece, be favorable to reducing device manufacturing cost to guarantee reaming efficiency.
Preferably, flexible reaming chain or cable is provided with three circles along reaming seat axial interval, and every circle is equipped with two flexible reaming chains or cables, is favorable to guaranteeing reaming efficiency to increase the stability and the reliability of device.
Preferably, the reaming radii of the three turns of flexible reaming chain or cable are 100mm, 200mm and 250mm respectively, the smaller the reaming radius the closer the flexible reaming chain or cable is to the drill bit. The purpose of drilling forward and gradually expanding the drilled hole can be achieved, and the reaming efficiency is improved.
As another aspect of the present invention, the present invention further provides a flexible reaming method based on the above flexible reaming device, including the following steps:
1) drilling and positioning: measuring and setting out according to the coal seam condition to position the drilling hole;
2) drilling: firstly, a common gas extraction drilling machine is used for drilling a common drill hole in a coal seam through a rock layer, the drilling is stopped after the depth of the common drill hole reaches a designed position, and a common drill bit is withdrawn.
3) Reaming: the reaming base of the flexible reaming device penetrates through a rock layer along a common drilling hole to be placed into a coal bed, the speed reduction motor is started, the driving drill rod rotates, the flexible reaming chain or the cable is made to swing under the inertia effect, high-pressure water is injected into the high-pressure water channel for improving the cutting strength of the flexible reaming chain or the cable to the coal bed, the high-pressure hose is expanded and hardened to enable the flexible reaming chain or the cable to rapidly extend and enhance the rigidity under the driving of the high-pressure water, efficient reaming of the coal bed is achieved, reaming is stopped when the reaming aperture reaches a designed value, and the flexible reaming device is withdrawn after the high-pressure hose is decompressed.
Preferably, in the step 3), when one end of the high-pressure hose, which is far away from the reaming base, is open, the coal seam is subjected to hydraulic cutting synchronously through high-pressure water, so that the reaming efficiency is further ensured.
The present invention also includes other components or steps that enable the flexible reaming device and method to be used properly, all by conventional means in the art. In addition, means, components or steps that are not limited in this invention are taken to be conventional in the art.
In the invention, the flexible reaming device drives the drill rod to rotate through the speed reducing motor, then drives the reaming base and the drill bit to rotate, the drill bit achieves the purpose of deepening the drilled hole, the flexible reaming chain or the cable connected on the periphery of the reaming base is thrown when the reaming base rotates, flexible beating is realized to the coal bed in the drill hole, thereby achieving the purpose of flexible reaming and ensuring the rigidity of a flexible reaming chain or a cable, high-pressure hoses penetrate through the flexible reaming chains or the cables, high-pressure water is introduced into the high-pressure hoses through high-pressure water channels in the drill rods and the reaming seats, the high-pressure hoses are expanded and hardened, and the flexible reaming chains or the cables are rapidly stretched and the rigidity is enhanced, thereby improve reaming efficiency, when the one end that the reaming seat was kept away from to the high pressure hose was uncovered, the open end blowout of high pressure water from the high pressure hose played the effect of water conservancy cutting to the coal seam to further improvement reaming efficiency. In order to further ensure the hydraulic cutting effect, the open end of the high-pressure hose can be connected with a high-pressure spray head.
The device has the advantages that flexible reaming is realized for coal seam drilling through the flexible reaming chain or the cable, the technical problems that the device is easy to damage and difficult to withdraw during reaming through the reaming arm in the prior art are solved, the reliability of the device is ensured, the rigidity of the flexible reaming chain or the cable is improved through the high-pressure hose, hydraulic cutting is assisted, the reaming efficiency of coal mine drilling can be greatly improved, and the reaming cost is reduced.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic view of the overall structure of the flexible reaming device of the present invention.
Fig. 2 is a schematic perspective view of the end of the flexible reamer chain of the present invention.
Detailed Description
The present invention will be described more clearly with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.
Example 1
As shown in fig. 1-2, the invention provides a flexible reaming device, which comprises a drill rod 1, a reaming base 2 and a drill bit 3, wherein two ends of the reaming base 2 are respectively connected with the drill bit 3 and the drill rod 1, one end of the drill rod 1, which is far away from the reaming base 2, is in transmission connection with a speed reduction motor (not shown in the figure), a flexible reaming chain 4 is arranged on the reaming base 2, the flexible reaming chain 4 is made of a high-strength wear-resistant metal material, and the high-strength wear-resistant metal material is made of 27 SiMn. And a high-pressure hose 5 penetrates through the flexible reaming chain 4, a high-pressure water channel 6 communicated with each other is arranged in the drill rod 1 and the reaming base 2, the high-pressure hose 5 is communicated with the high-pressure water channel 6, and one end, far away from the reaming base 2, of the high-pressure hose 5 is opened or closed. Flexible reaming chain 4 adopts mining high strength round-link chain, and each chain link degree of freedom of mining high strength round-link chain is high, can avoid appearing long-pending coal problem between mining high strength round-link chain and reaming seat 2, and conveniently wears to establish high-pressure hose 5. The high-pressure hose 5 is made of an armored metal hose, so that the service life of the high-pressure hose 5 is guaranteed. The outer surfaces of the reaming base 2 and the drill rod 1 are provided with spiral guide chutes 7, so that broken coal particles can be conveniently and timely conveyed out of drilled holes during reaming, and the reaming efficiency is ensured. Drilling rod 1 and 2 threaded connection of reaming seat, reaming seat 2 corresponds with the link of drill bit 3 and is provided with assorted unsmooth connecting portion, and reaming seat 2 passes through bolt fixed connection with the unsmooth connecting portion of drill bit 3, guarantees the reliability that drill bit 3 connects. One end of the flexible reaming chain 4 far away from the reaming base 2 is provided with a diamond composite sheet 8, so that the service life of the flexible reaming chain 4 is prolonged, the manufacturing cost of the device is reduced, and the reaming efficiency is improved. Flexible reaming chain 4 is provided with three circles along the axial interval of reaming seat 2, and every circle is equipped with two flexible reaming chains 4, is favorable to guaranteeing reaming efficiency to increase the stability and the reliability of device. The reaming radii of the three rings of flexible reaming chains 4 are respectively 100mm, 200mm and 250mm, and the closer the flexible reaming chains 4 are to the drill bit, the smaller the reaming radii are. The purpose of drilling forward and gradually expanding the drilled hole can be achieved, and the reaming efficiency is improved.
In the invention, the flexible reaming device drives the drill stem 1 to rotate through the speed reducing motor, then drives the reaming base 2 and the drill bit 3 to rotate, the drill bit 3 plays the purpose of deepening the drilled hole, the flexible reaming chain 4 connected on the periphery of the reaming base 2 is thrown when the reaming base rotates, flexible beating is realized to the coal bed in the drill hole, thereby achieving the purpose of flexible reaming and ensuring the rigidity of the flexible reaming chain 4, a high-pressure hose 5 is arranged in the flexible reaming chain 4 in a penetrating way, and high-pressure water is introduced into the high-pressure hose 5 through a high-pressure water channel 6 in the drill rod 1 and the reaming base 2, so that the high-pressure hose 5 is expanded and hardened, the flexible reaming chain 4 is rapidly stretched and the rigidity is enhanced, therefore, the reaming efficiency is improved, when one end of the high-pressure hose 5, which is far away from the reaming base 2, is open, high-pressure water is sprayed out from the open end of the high-pressure hose 5, the hydraulic cutting effect is achieved on the coal seam, and the reaming efficiency is further improved.
Example 2
As shown in fig. 1 to 2, the present invention further provides a flexible reaming method based on the flexible reaming device described in embodiment 1, including the following steps:
1) drilling and positioning: measuring and setting out according to the coal seam condition to position the drilling hole;
2) drilling: firstly, drilling a common drill hole in a coal seam through a rock layer by using a common gas extraction drilling machine, wherein the aperture of the common drill hole is 113mm, stopping drilling after the depth of the common drill hole reaches a designed position, and withdrawing a common drill bit;
3) reaming: in passing the rock layer along ordinary drilling with reaming seat 2 of flexible reaming device and putting into the coal seam, start gear motor, driving drill rod 1 is rotatory, makes flexible reaming chain 4 whip under the inertial action, for improving the cutting strength of flexible reaming chain 4 to the coal seam, to high pressure water is injected into to high pressure water channel 6, under the drive of high pressure water, the high pressure hose 5 inflation sclerosis makes flexible reaming chain 4 extend fast and rigidity reinforcing, realizes the high-efficient reaming to the coal seam, when the one end of reaming seat 2 is uncovered when keeping away from high pressure hose 5, carries out water conservancy cutting in step to the coal seam through the high pressure water, has further guaranteed reaming efficiency. Stopping reaming when the reaming aperture reaches 500mm, and withdrawing the flexible reaming device after the pressure of the high-pressure hose 5 is relieved.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (10)
1. A flexible reaming device, includes the drilling rod, its characterized in that: still include reaming seat and drill bit, the both ends of reaming seat are connected with drill bit and drilling rod respectively, the drilling rod is kept away from the one end of reaming seat and is connected with the gear motor transmission, be equipped with flexible reaming chain or cable on the reaming seat, flexible reaming chain or cable all adopt high-strength wear-resisting metal material, and all wear to be equipped with high-pressure hose in flexible reaming chain or the cable, be equipped with the high pressure water channel that is linked together in drilling rod and the reaming seat, high pressure hose is linked together with high pressure water channel, the one end that the reaming seat was kept away from to high pressure hose is uncovered or seals the setting.
2. The flexible reaming device of claim 1, wherein: the flexible reaming chain is a mining high-strength round-link chain.
3. The flexible reaming device of claim 1, wherein: the high-pressure hose is an armored metal hose.
4. The flexible reaming device of claim 1, wherein: and spiral guide chutes are arranged on the outer surfaces of the reaming seat and the drill rod.
5. The flexible reaming device of claim 1, wherein: the drill rod is in threaded connection with the reaming base, the connecting end of the reaming base and the drill bit is correspondingly provided with matched concave-convex connecting parts, and the reaming base is fixedly connected with the concave-convex connecting parts of the drill bit through bolts.
6. The flexible reaming device of claim 1, wherein: 27SiMn material is selected for use to the wear-resisting metal material that excels in, still be equipped with the diamond compact piece on flexible reaming chain or the cable.
7. The flexible reaming device of claim 1, wherein: the flexible reaming chains or cables are axially arranged in three circles at intervals along the reaming base, and each circle is provided with two flexible reaming chains or cables.
8. The flexible reaming device of claim 7, wherein: the reaming radii of the three turns of flexible reaming chains or cables are 100mm, 200mm and 250mm, respectively, the closer the flexible reaming chains or cables are to the drill bit, the smaller the reaming radii are.
9. A method of flexible reaming a hole in accordance with any of the claims 1 to 8, comprising the steps of:
1) drilling and positioning: measuring and setting out according to the coal seam condition to position the drilling hole;
2) drilling: firstly, drilling a common drill hole in a coal seam through a rock layer by using a common gas extraction drilling machine, stopping drilling after the depth of the common drill hole reaches a designed position, and withdrawing a common drill bit;
3) reaming: the reaming base of the flexible reaming device penetrates through a rock layer along a common drilling hole to be placed into a coal bed, the speed reduction motor is started, the driving drill rod rotates, the flexible reaming chain or the cable is made to swing under the inertia effect, high-pressure water is injected into the high-pressure water channel for improving the cutting strength of the flexible reaming chain or the cable to the coal bed, the high-pressure hose is expanded and hardened to enable the flexible reaming chain or the cable to rapidly extend and enhance the rigidity under the driving of the high-pressure water, efficient reaming of the coal bed is achieved, reaming is stopped when the reaming aperture reaches a designed value, and the flexible reaming device is withdrawn after the high-pressure hose is decompressed.
10. The flexible reaming method of claim 9, wherein: and 3) in the step 3), when one end of the high-pressure hose, which is far away from the reaming base, is open, the coal seam is subjected to hydraulic cutting synchronously through high-pressure water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010744663.XA CN111720059A (en) | 2020-07-29 | 2020-07-29 | Flexible reaming device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010744663.XA CN111720059A (en) | 2020-07-29 | 2020-07-29 | Flexible reaming device and method |
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| CN111720059A true CN111720059A (en) | 2020-09-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1427528A (en) * | 1972-11-20 | 1976-03-10 | Reader Sons Ltd E | Device for making under-reams for ground anchors |
| WO2001077445A1 (en) * | 2000-04-11 | 2001-10-18 | Stump Spezialtiefbau Gmbh | Method and device for the production of back-cut cavities |
| CN202733225U (en) * | 2012-08-06 | 2013-02-13 | 吕飞龙 | Novel telescopic water pipe |
| CN111255381A (en) * | 2020-03-05 | 2020-06-09 | 中煤科工集团重庆研究院有限公司 | Comprehensive permeability increasing device for coal bed mechanical reaming and hydraulic slotting |
| CN212642604U (en) * | 2020-07-29 | 2021-03-02 | 河南理工大学 | Flexible reaming device |
-
2020
- 2020-07-29 CN CN202010744663.XA patent/CN111720059A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1427528A (en) * | 1972-11-20 | 1976-03-10 | Reader Sons Ltd E | Device for making under-reams for ground anchors |
| WO2001077445A1 (en) * | 2000-04-11 | 2001-10-18 | Stump Spezialtiefbau Gmbh | Method and device for the production of back-cut cavities |
| CN202733225U (en) * | 2012-08-06 | 2013-02-13 | 吕飞龙 | Novel telescopic water pipe |
| CN111255381A (en) * | 2020-03-05 | 2020-06-09 | 中煤科工集团重庆研究院有限公司 | Comprehensive permeability increasing device for coal bed mechanical reaming and hydraulic slotting |
| CN212642604U (en) * | 2020-07-29 | 2021-03-02 | 河南理工大学 | Flexible reaming device |
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