CN106761463A - The abnormal closure novel compositions drilling tool attachment structure of probing - Google Patents
The abnormal closure novel compositions drilling tool attachment structure of probing Download PDFInfo
- Publication number
- CN106761463A CN106761463A CN201710091113.0A CN201710091113A CN106761463A CN 106761463 A CN106761463 A CN 106761463A CN 201710091113 A CN201710091113 A CN 201710091113A CN 106761463 A CN106761463 A CN 106761463A
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- China
- Prior art keywords
- extension bar
- diameter
- ring
- screwed hole
- screw mandrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000005553 drilling Methods 0.000 title claims abstract description 53
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 14
- 239000000203 mixture Substances 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 238000003032 molecular docking Methods 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 9
- 239000004677 Nylon Substances 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003245 coal Substances 0.000 description 10
- 238000013461 design Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000505 pernicious effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E21B17/006—Accessories for drilling pipes, e.g. cleaners
Landscapes
- 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 abnormal closure novel compositions drilling tool attachment structure of probing of the invention, is provided with bulge loop on the forward end of preceding extension bar is cylindrical, and preceding extension bar end head offers the first screwed hole, and the second screwed hole is offered at the end head of preceding extension bar rear end；The end of extension bar one end is cylindrical afterwards offers the first screw mandrel, and the end of the rear extension bar other end offers the 3rd screwed hole, and the body of rod middle part of rear extension bar is provided with contour bathtub construction；Docking back-up ring is the trapezoidal cylinder structure of quadravalence；Sealing shroud it is cylindrical on be provided with annular groove, rubber seal is installed in annular groove；Preceding extension bar is connected by the second screwed hole with the second screw mandrel of docking back-up ring, and docking back-up ring is connected by the 3rd screw mandrel with the 3rd screwed hole of rear extension bar；Sealing shroud is sleeved on the preceding extension bar body of rod and is located between bulge loop and cylinder back-up ring, and rubber seal is provided between sealing shroud and bulge loop, and rubber seal is provided between sealing shroud and cylinder back-up ring.The present invention improves leting speeper construction speed, has ensured spy water job safety.
Description
Technical field
The invention belongs to mine drilling tool field of mechanical technique, and in particular to the abnormal closure novel compositions drilling tool of one kind probing
Attachment structure.
Background technology
As safety of coal mines technical equipment is improved constantly, coal mine flood preventing treatment technology is comparatively substantially stagnant
Afterwards.In face of the present situation of coal mine flood Frequent Accidents, safety of coal mines authorities of government have formulated strict leting speeper regulation, have arranged
Apply.According to《Mine geological hazards specify》It is required that, getting working face should carry out leting speeper close to after visiting water warning line.In coal seam
Leting speeper forbids leting speeper to press the water source higher than 1MPa in principle.It is even more for some particular cases and defines and must stop in installation
After jacket pipe, leting speeper operation can be carried out.Leting speeper design more than, hole count big for some drilling design density, installation stops
Jacket pipe job execution difficulty is big, and workload is big, and each hole sealing tube influences each other in coal head centralized arrangement, certainly will extend drilling operation
Process simultaneously has a strong impact on driving progress.Gush out effectively to block the probing water outlet behind the Tan Tou exceptions areas of water exploring drill hole, pernicious gas
The problems such as, the safety of drilling operation personnel and other operating personnels is ensured, manufacture and design that a kind of stable conditions, reliability be high, envelope
The probing of stifled good leak tightness closure way-type drilling unit extremely, there is the urgent requirement of reality.
When traditional coal mine underground construction leting speeper and firedamp taking-out discharging drilling, to drilling the drilling water outlet formed after transmission, having
Evil gas is gushed out cannot carry out quick effectively closure.It is even more for some particular cases and defines and sealing sleeve pipe must be installed
Afterwards, leting speeper operation can be carried out.Leting speeper design more than, hole count big for some drilling design density, installs sealing sleeve pipe
Job execution difficulty is big, and workload is big, and each hole sealing tube influences each other in coal head centralized arrangement, certainly will extend drilling operation process simultaneously
Have a strong impact on driving progress.In addition, underground coal mine probing is restricted by drilling construction principle, the difference of drill bit and drill pipe diameter must be big
Landwaste maximum particle diameter is produced in drilling, drilling is maintained to exclude drilling cuttings.Thus, closure drilling must shift to an earlier date construction drill sealing of hole
Pipe.First by bore expanded hole to internal diameter can receiving drill bit steel aperture hole sealing tube external diameter, and leave appropriate surplus.Removing rig will
Hole sealing tube is installed in place and implements slip casting or twine numb fixation, and rig can be again installed after bulge test is qualified by hole sealing tube pipe
Mouth valve continues to creep into.As can be seen here, traditional method for sealing technique is cumbersome, long construction period, and plugging effect receives sealing of hole length of tube
And the corrosion-resistant intensity of hole sealing tube is restricted, drawback is apparent.The invention exactly solves this technical barrier, is occurring this
Fast and effectively urgent closure can be realized during class dangerous situation to drilling, so as to quickly eliminate the hidden danger that permeable and pernicious gas is gushed out.
The content of the invention
It is an object of the invention to provide the abnormal closure novel compositions drilling tool attachment structure of one kind probing.Effectively solution of the invention
Determine in the case of non-mounting hole hole sealing tube, the drilling water outlet of formation, pernicious gas after probing transmission are gushed out, and it is fast to carry out
The technical barrier of fast effectively closure.Leting speeper construction speed is improve, spy water job safety has been ensured.
The technical solution adopted by the present invention：The abnormal closure novel compositions drilling tool attachment structure of one kind probing, it includes preceding connecing
Bar, rear extension bar, docking back-up ring, sealing shroud and rubber seal, preceding extension bar is a cylindrical structural, and preceding extension bar is in axial direction
Through hole is offered inside the body of rod, the cylindrical upper projection of forward end of preceding extension bar is provided with greater diameter than preceding extension bar shank diameter
Bulge loop, in preceding extension bar front end, end head offers one section of first screwed hole for installing drill bit, at preceding extension bar rear end end
One section of second screwed hole is offered at head；Extension bar is a cylindrical structural afterwards, is opened inside the rear extension bar body of rod in axial direction
Through hole is provided with, the end of rear extension bar one end is cylindrical to offer one section of first screw mandrel being connected with drilling tool, the end of the rear extension bar other end
Portion offers one section of the 3rd screwed hole, peripherally disposed at contour section in the middle part of the body of rod of rear extension bar to have equidistant four
Individual contour bathtub construction；Docking back-up ring is the trapezoidal cylinder structure of quadravalence, and the second screw mandrel, cylindrical bar, circle are followed successively by from left to right
Post back-up ring and the 3rd screw mandrel, wherein, the aperture of the second screwed hole is identical with the diameter of the second screw mandrel, the aperture of the 3rd screwed hole with
The diameter of the 3rd screw mandrel is identical, and the diameter of cylindrical bar is identical with the shank diameter of preceding extension bar, and the diameter of cylinder back-up ring connects before being higher by
Shank diameter certain distance；Sealing shroud is the hollow circular sheath structure being made up of nylon material, the hollow circular sheath structure
Internal diameter it is identical with the shank diameter of preceding extension bar, sealing shroud it is cylindrical on be provided with several annular grooves, be provided with annular groove
Rubber seal；Preceding extension bar is connected by the second screwed hole with the second screw mandrel of docking back-up ring, and docking back-up ring passes through the 3rd screw mandrel
It is connected with the 3rd screwed hole of rear extension bar；Sealing shroud is sleeved on the preceding extension bar body of rod and is located between bulge loop and cylinder back-up ring, wherein,
Rubber seal is provided between sealing shroud and bulge loop, rubber seal is provided between sealing shroud and cylinder back-up ring.
Further, the diameter of the first described screw mandrel is identical with the diameter of the first screwed hole.
Further, the second described screwed hole and the 3rd screwed hole aperture are identical.
Further, the outside diameter of described sealing shroud is higher by the diameter certain distance of cylinder back-up ring, and is bored with drilling tool
The diameter of head is identical；The sealing shroud is provided with the tapered section that one section of diameter is gradually reduced in the end near bulge loop one end,
And the taper of the tapered section is 3 degree.
Further, described docking back-up ring is in axial direction provided with through hole.
Further, the bar footpath of described rear extension bar and the bar footpath of preceding extension bar are identical.
Further, the length of described sealing shroud is equal to the length sum of the preceding extension bar body of rod and cylindrical bar.
Its advantage is the present invention compared with prior art：Reasonable in design of the present invention, reliability is high, blocks closed
Property it is good, it is adaptable to when coal mine underground construction leting speeper and firedamp taking-out discharging drilling, occur permeable dangerous situation when to drilling can realize quickly,
Effective urgent closure, so as to eliminate permeable hidden danger.Present invention can apply to all kinds of small elevations angle to the vertical angle of depression drill it is timely
Effectively closure, improves drilling rate, reduces drilling accident incidence.
Brief description of the drawings
Fig. 1 is half-sectional structural representation of the invention；
Fig. 2 is the structural representation of docking back-up ring in the present invention.
Specific embodiment
As shown in figure 1, a kind of abnormal closure novel compositions drilling tool attachment structure of probing, it include preceding extension bar 1, rear extension bar 2,
Docking back-up ring 3, sealing shroud 4 and rubber seal 5, preceding extension bar 1 are a cylindrical structural, the body of rod in axial direction of preceding extension bar 1
Inside offers through hole 6, and the cylindrical upper projection of forward end of preceding extension bar 1 is provided with greater diameter than the shank diameter of preceding extension bar 1
Bulge loop 7, offers one section of first screwed hole 8 for installing drill bit, after preceding extension bar 1 in the front end end head of preceding extension bar 1
One section of second screwed hole 9 is offered at the end head of end；Extension bar 2 is a cylindrical structural, the body of rod in axial direction of rear extension bar 2 afterwards
Inside offers through hole 6, and the end of the one end of rear extension bar 2 is cylindrical to offer one section of first screw mandrel 10 being connected with drilling tool, rear extension bar 2
The end of the other end offers one section of the 3rd screwed hole 11, is along the circumferential direction set at contour section in the middle part of the body of rod of rear extension bar 2
It is equipped with the equidistant four contour bathtub constructions 12 for playing clipping operation；Such as Fig. 2, docking back-up ring 3 is the trapezoidal circle of quadravalence
Rod structure, is followed successively by the second screw mandrel 13, cylindrical bar 14, the screw mandrel 16 of cylinder back-up ring 15 and the 3rd from left to right, wherein, the second screw thread
The aperture in hole 9 is identical with the diameter of the second screw mandrel 13, and the aperture of the 3rd screwed hole 11 is identical with the diameter of the 3rd screw mandrel 16, cylinder
The diameter of bar 14 is identical with the shank diameter of preceding extension bar 1, and the diameter of cylinder back-up ring 15 is higher by the diameter certain distance of preceding extension bar 1；It is close
Big envelope 4 is the hollow circular sheath structure being made up of nylon material, internal diameter and the preceding extension bar 1 of the hollow circular sheath structure
Shank diameter is identical, sealing shroud 4 it is cylindrical on be provided with several annular grooves, rubber seal 5 is installed in annular groove；Before connect
Bar 1 is connected by the second screwed hole 9 with the second screw mandrel 13 of docking back-up ring 3, and docking back-up ring 3 passes through the 3rd screw mandrel 16 and rear extension bar
2 the 3rd screwed hole 11 is connected；Sealing shroud 4 is sleeved on the body of rod of preceding extension bar 1 and is located between bulge loop 7 and cylinder back-up ring 15, wherein,
Rubber seal 5 is provided between sealing shroud 4 and bulge loop 7, rubber seal 5 is provided between sealing shroud 4 and cylinder back-up ring 15.
The diameter of the first screw mandrel 10 is identical with the diameter of the first screwed hole 8 in the present invention.Second screwed hole 9 and the aperture of the 3rd screwed hole 11
It is identical.The outside diameter of described sealing shroud 4 is higher by the diameter certain distance of cylinder back-up ring 15, and with the diameter phase of drill bit
Together；The sealing shroud 4 is provided with the tapered section 17 that one section of diameter is gradually reduced, and the cone in the end near the one end of bulge loop 7
The taper for spending section 17 is 3 degree.The bar footpath of extension bar 2 and the bar footpath of preceding extension bar 1 are identical afterwards.The length of sealing shroud 4 is equal to the bar of preceding extension bar 1
The length sum of body and cylindrical bar 14.
Diameter difference of the present invention between drill bit and drilling rod is started with, and is filled up between drill hole inner wall and drilling rod using suitable material
Space.Material specific requirement：, good toughness small with rib coefficient of friction, allows a small amount of deformation, and stuck, corrosion resistant is unlikely in propulsion
Erosion, it is appropriate to manifest stabilization, compression strength to old sky aqueous corrosion, not easily generation plastic deformation the features such as.Nylon material is meeting
More there are easy processing, consistency while above-mentioned required, be adapted in the long-term off-duty storage in underground.To further enhance
The sealing property of way-type drilling unit, several O is set up in metal drill pipe with the body of sealed nylon set combination port and sealing shroud
Type rubber seal so that the drilling tool possesses good watertightness and air-tightness.Can be applied using the drilling tool of structure of the present invention
In the timely and effective closure that all kinds of small elevations angle to the vertical angle of depression drill, drilling rate is improved, reduce drilling accident incidence.Utilize
The toughness of nylon material, the sealing of elastomeric material, are mutually combined with metal drilling tool, are not increasing the situation of drilling construction difficulty
Under, closure is implemented to drilling.By experiment, drilling tool closure hydraulic pressure is watertight for the dust-proof static pressure water of 2MPa can reach.
Economic benefit can save drilling and sealing tube material steel pipe, ring flange, sealing of hole slurries etc. every year by taking Yangquan Shanxi Gu Zhuan collieries as an example
Fee of material is no less than 11.4 ten thousand yuan.What is more important can ensure drilling operation and other underground work using the way-type drilling unit
The safety of personnel, it is to avoid flood well because of leting speeper operation, flood the great water damage accident in lane, its safety benefit cannot be estimated.
Claims (7)
1. drill abnormal closure novel compositions drilling tool attachment structure, it include preceding extension bar, rear extension bar, docking back-up ring, sealing shroud and
Rubber seal, it is characterised in that preceding extension bar is a cylindrical structural, is offered inside the preceding extension bar body of rod in axial direction logical
Hole, the cylindrical upper projection of forward end of preceding extension bar is provided with the bulge loop greater diameter than preceding extension bar shank diameter, before preceding extension bar
End end head offers one section of first screwed hole for installing drill bit, and one section is offered at the end head of preceding extension bar rear end
Second screwed hole；Extension bar is a cylindrical structural afterwards, and through hole, rear extension bar one are offered inside the rear extension bar body of rod in axial direction
The end at end is cylindrical to offer one section of first screw mandrel being connected with drilling tool, and the end of the rear extension bar other end offers one section of the 3rd spiral shell
Pit, it is peripherally disposed at contour section in the middle part of the body of rod of rear extension bar to have equidistant four contour bathtub constructions；It is right
The trapezoidal cylinder structure that back-up ring is quadravalence is connect, the second screw mandrel, cylindrical bar, cylinder back-up ring and the 3rd screw mandrel is followed successively by from left to right,
Wherein, the aperture of the second screwed hole is identical with the diameter of the second screw mandrel, the aperture of the 3rd screwed hole and the diameter phase of the 3rd screw mandrel
Together, the diameter of cylindrical bar is identical with the shank diameter of preceding extension bar, and the diameter of cylinder back-up ring is higher by preceding extension bar diameter certain distance；It is close
Big envelope is the hollow circular sheath structure being made up of nylon material, the internal diameter of the hollow circular sheath structure and the bar of preceding extension bar
Body diameter is identical, sealing shroud it is cylindrical on be provided with several annular grooves, rubber seal is installed in annular groove；Preceding extension bar leads to
Cross the second screwed hole to be connected with the second screw mandrel of docking back-up ring, docking back-up ring passes through the 3rd screwed hole of the 3rd screw mandrel and rear extension bar
Connection；Sealing shroud is sleeved on the preceding extension bar body of rod and is located between bulge loop and cylinder back-up ring, wherein, set between sealing shroud and bulge loop
There is rubber seal, rubber seal is provided between sealing shroud and cylinder back-up ring.
2. the abnormal closure novel compositions drilling tool attachment structure of probing according to claim 1, it is characterised in that described the
The diameter of one screw mandrel is identical with the diameter of the first screwed hole.
3. the abnormal closure novel compositions drilling tool attachment structure of probing according to claim 1, it is characterised in that described the
Two screwed holes and the 3rd screwed hole aperture are identical.
4. probing according to claim 1 is abnormal blocks novel compositions drilling tool attachment structure, it is characterised in that described is close
The outside diameter of big envelope is higher by the diameter certain distance of cylinder back-up ring, and identical with the diameter of drill bit；The sealing shroud exists
The end of bulge loop one end is provided with the tapered section that one section of diameter is gradually reduced, and the taper of the tapered section is 3 degree.
5. probing according to claim 1 is abnormal blocks novel compositions drilling tool attachment structure, it is characterised in that described is right
Connect back-up ring and be in axial direction provided with through hole.
6. probing according to claim 1 is abnormal blocks novel compositions drilling tool attachment structure, it is characterised in that after described
The bar footpath of extension bar is identical with the bar footpath of preceding extension bar.
7. probing according to claim 1 is abnormal blocks novel compositions drilling tool attachment structure, it is characterised in that described is close
The length of big envelope is equal to the length sum of the preceding extension bar body of rod and cylindrical bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710091113.0A CN106761463B (en) | 2017-02-20 | 2017-02-20 | Probing is abnormal to block novel compositions drilling tool connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710091113.0A CN106761463B (en) | 2017-02-20 | 2017-02-20 | Probing is abnormal to block novel compositions drilling tool connection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106761463A true CN106761463A (en) | 2017-05-31 |
| CN106761463B CN106761463B (en) | 2019-01-11 |
Family
ID=58958413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710091113.0A Expired - Fee Related CN106761463B (en) | 2017-02-20 | 2017-02-20 | Probing is abnormal to block novel compositions drilling tool connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106761463B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109763778B (en) * | 2019-03-27 | 2020-04-21 | 邹城兖矿泰德工贸有限公司 | Coal-exploring drill rod |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1740614A1 (en) * | 1988-07-19 | 1992-06-15 | Государственный Проектный Институт "Карагандагипрошахт" | Combined drill pipe |
| WO1994001652A1 (en) * | 1992-07-02 | 1994-01-20 | Tristar Oilfield Services Limited | Joining tubing with a gas tight seal |
| CN2385073Y (en) * | 1999-05-14 | 2000-06-28 | 地质矿产部探矿工程研究所 | Vacuum spiral drilling tool for taking gas |
| CN202220617U (en) * | 2011-09-01 | 2012-05-16 | 淮南矿业(集团)有限责任公司 | Drilling extraction hole plugging device |
| CN104653143A (en) * | 2013-11-20 | 2015-05-27 | 西安大昱光电科技有限公司 | Novel mechanical gas extraction stopper |
-
2017
- 2017-02-20 CN CN201710091113.0A patent/CN106761463B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1740614A1 (en) * | 1988-07-19 | 1992-06-15 | Государственный Проектный Институт "Карагандагипрошахт" | Combined drill pipe |
| WO1994001652A1 (en) * | 1992-07-02 | 1994-01-20 | Tristar Oilfield Services Limited | Joining tubing with a gas tight seal |
| CN2385073Y (en) * | 1999-05-14 | 2000-06-28 | 地质矿产部探矿工程研究所 | Vacuum spiral drilling tool for taking gas |
| CN202220617U (en) * | 2011-09-01 | 2012-05-16 | 淮南矿业(集团)有限责任公司 | Drilling extraction hole plugging device |
| CN104653143A (en) * | 2013-11-20 | 2015-05-27 | 西安大昱光电科技有限公司 | Novel mechanical gas extraction stopper |
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| Publication number | Publication date |
|---|---|
| CN106761463B (en) | 2019-01-11 |
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Granted publication date: 20190111 |