CN102061930A - Downhole fast sealing device in coal mine - Google Patents
Downhole fast sealing device in coal mine Download PDFInfo
- Publication number
- CN102061930A CN102061930A CN 201010580601 CN201010580601A CN102061930A CN 102061930 A CN102061930 A CN 102061930A CN 201010580601 CN201010580601 CN 201010580601 CN 201010580601 A CN201010580601 A CN 201010580601A CN 102061930 A CN102061930 A CN 102061930A
- Authority
- CN
- China
- Prior art keywords
- air bag
- pressure
- main body
- sealing device
- air
- 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.)
- Granted
Links
Images
Landscapes
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention belongs to the field of safety facilities in a coal mine, and relates to a downhole temporary fast sealing device in case of coal mine fire hazard. The sealing device consists of hangers (1), an air bag main body (2), an air blocking cloth (3), a high pressure rubber hose (4), a pressure balancing device (5), a high pressure air source (6), stay cord fasteners (7), stay cords (8), unidirectional inflation nozzles (9) and wedges (10). The downhole fast sealing device has the advantages that the air blocking cloth is utilized as a sealing main body and the air bag is utilized as a support framework structure, which reduces inflation volume so as to greatly shorten inflation time; by adopting the novel pressure balancing device, the automatic regulation and control capability of the air bag is improved in the case of unattended operation, thus greatly improving the stability, safety and reliability of the sealed air bag; and by adopting the novel Hailong rubber material, the tightness between the sealing device and a roadway wall is enhanced, the air leakage rate is reduced, the high-temperature resistance is strengthened, and the sealing effect of the air bag is further improved.
Description
Technical field
The invention belongs to the coalmining safety facility field, relate to a kind of coal-mine fire interim rapid sealing device in down-hole in period that is used for.
Background technology
Mine fire is one of the main natural calamity in colliery.In case mine generation spontaneous combustionof coal, gently then influence is produced, and is heavy then may burn whole production equipments of down-hole and cause the stopping production of mine, brings enormous economic loss.In recent years, China's coal-mine mine fire accident and the loss that causes are more serious, and tracing it to its cause is exactly that the whole preventing and extinguishing fire technology of China's coal-mine and equipment and production development are incompatible.In disaster relief process, because of airtight untimely, airtight scope is excessive, and the control intensity of a fire time causes that than length the example of second accident generation is too numerous to enumerate.How realizing quick fire sealing in mine disaster relief process, reduce close range is to shorten fire life, reduce causality loss, avoid the main difficult technical of secondary disaster.
Present on-the-spot extensive use be that plank adds and is coated with the airtight temporarily of yellow mud, though this method has characteristic of simple structure, but change with getting angry the difference in place owing to install airtight place, so that the transportation of materials such as plank, pin, yellow mud seems very difficult.So be difficult to accomplish at the scene rapidly, and it is also poor that the back sealing effectiveness is installed.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can realize the fire period rapid sealing, and simple in structure, carry easy to operate, inleakage is little, the interim rapid sealing device of capsule-type safe, good reliability.
A kind of underground mine use rapid sealing device is characterized in that it forms by having hook (1), main body air bag (2), wind locking cloth (3), high-pressure rubber pipe (4), pressure equaliser (5), high-pressure air source (6) stay cord button (7), stay cord (8), unidirectional charging connector (9), chock (10).Hook (1) passes through special gelatin bonding symmetrically on wind locking cloth (3) with stay cord button (7), two unidirectional charging connectors (9) are installed in the two ends of main body air bag (2), high-pressure air source (6) is connecting high-pressure rubber pipe (4), inflates in main body air bag (2) by unidirectional charging connector (9).Unidirectional charging connector (9), pressure equaliser (5) and high-pressure air source (6) link together by high-pressure rubber pipe (4), and stay cord (8) is fixed on the wall by chock (10), are used to prevent that the excessive wind locking cloth that causes of blast comes off when airtight.Described hook (1) coheres on the relevant position of wind locking cloth by seccotine with stay cord (8).
Described main body air bag (2) and wind locking cloth (3) are made by novel sea otter elastomeric material, and high temperature resistant, wear-resisting and process antistatic is handled, and obtain coal peace sign.Main body air bag (2) has and buckles; Unidirectional charging connector (9) is copper.
Pressure equaliser mainly is made up of the high-pressure rubber pipe (4) of barometer (11), silk mouthful interface (12), tee piece (13), pneumatic control valve (14), flame proof outer container (15) and band interface, consider the essential safety problem and prevent that pneumatic control valve lost efficacy under the abominable working environment in down-hole, pneumatic control valve (14) adopts full copper or stainless steel, and is placed in the flame proof outer container (15).Pressure equaliser is connected with high-pressure air source (6) by high-pressure rubber pipe (4), forms a complete air supply system, and belonging to the most important annex of a whole set of rapid sealing equipment, can to guarantee that the air bag internal gas pressure remains on the level of setting constant.
Wind locking cloth among the present invention and main body air bag all are to be made by novel sea otter elastomeric material, have high temperature resistant, wear-resisting characteristic; Pressure equaliser is made up of pneumatic pressure-regulating valve, pressure gauge, explosion-resistant enclosure and other accessories, and between high-pressure air source and main body air bag, the pressure of the main body air bag when being used for unmanned compensates automatically.In the practical application, be affiliated to wind locking cloth after, the main body air bag is set along the drift section symmetry, utilize the high-pressure air source fast aeration then, main body air bag after expanding as support frame, is made air bag and wall driving fit by the pliability of elastomeric material, thereby reaches the effect of rapid sealing.
Description of drawings
Below in conjunction with accompanying drawing the present invention is elaborated.
Fig. 1 is apparatus of the present invention structural representation.
Comprise hook 1, main body air bag 2, wind locking cloth 3, high-pressure rubber pipe 4, pressure equaliser 5, high-pressure air source 6, stay cord button 7, stay cord 8, unidirectional charging connector 9 and chock 10.
Fig. 2 is the structural representation of pressure equaliser.
The high-pressure rubber pipe 4 that comprises barometer 11, silk mouthful interface 12, tee piece 13, pneumatic control valve 14, flame proof outer container 15 and band interface.
Fig. 3 is a shutoff rectangular cross section tunnel schematic diagram.Among the figure, the main body air bag is bent into rectangle along the edge, tunnel, supports wind locking cloth as skeleton.
The specific embodiment
Operating principle of the present invention is as follows: choose suitable position during use earlier, principle is to select support and top board is more complete and do not have and take out the place that emits and construct.The center that finds support during construction earlier hangs over the center of wind locking cloth on the center line of support then, simultaneously the hook of both sides is hung in the both sides of support, and with galvanized wire with shackle be fixed on make on the support only to become as a whole.For unsupported anchor spray or arching roadway, spacing according to the hook on the wind locking cloth is stained with several hooks in top and both sides on the tunnel with quick hardening cement or accelerating admixture before hanging, then the hook on the wind locking cloth is hung on this hook, and the stay cord of wind locking cloth both sides fixed by chock, prevent that the excessive wind locking cloth that causes of instantaneous blast from being started.After wind locking cloth hangs up properly, carry out hanging of air bag, earlier the center suspension ring of air bag are hung over when hanging on the central hook on the wind locking cloth, the shackle with both sides is hung on the hook of wind locking cloth then.After hanging to one, wind locking cloth, air bag and support just can inflate air bag.Can adopt the high-pressure nitrogen bottle inflation also can adopt " bellows " manual inflation during inflation, in the process of inflation, should accomplish adjustment air bag while filling, make air bag contact tight all around with the tunnel, air bag with excess length encloses on the base plate that is pressed in the tunnel simultaneously, and aeration quantity is no more than 70% of total air inflow for the first time.After air bag and tunnel contact tightly fully, air bag is full of reaches rated pressure 10Kpa at last, the lock pressure bascule is at 10Kpa.Rapid sealing was hung and was finished this moment, reached obturation effect.Near roadway floor, press at more than needed section local available gangue that does not press of air bag or old timber and to prevent from distinguished and admirable wind locking cloth to be started.
Application example
The present invention carries out field application test at certain colliery 15108 work plane.
Utilize the present invention to carry out (4.8m * 2.7m) and connection roadway (the shutoff test of 3.5m * 2.3m) of this tailentry according to the specific embodiment.The determination data that test is relevant sees Table 1-2.
The table 1 return airway (experimental data of 4.8m * 2.7m)
| Sequence number | Project | Experimental data | |
| 1 | The drift | Rectangle | |
| 2 | Tunnel net section/m 2 | 13.16 | |
| 3 | Rapid sealing required time/min is installed | 8 | |
| 4 | Airtight preceding air quantity/m by the tunnel 3·min -1 | 1812 | |
| 5 | Airtight back is by the air quantity/m in tunnel 3·s -1 | 67.1 | |
| 6 | Airtight two ends leeway/pa | 1715 | |
| 7 | Airtight air leak rate of air curtain/% | 3.7 |
The table 2 connection roadway (experimental data of 3.5m * 2.3m)
| Sequence number | Project | Experimental data | |
| 1 | The drift | Rectangle | |
| 2 | Tunnel net section/m 2 | 8.05 | |
| 3 | Rapid sealing required time/min is installed | 6 | |
| 4 | Airtight preceding air quantity/m by the tunnel 3·min -1 | 1108 | |
| 5 | Airtight back is by the air quantity/m in tunnel 3·s -1 | 37.7 | |
| 6 | Airtight two ends leeway/pa | 1432 | |
| 7 | Airtight air leak rate of air curtain/% | 3.4 |
As can be seen from the table, air leak rate of air curtain of the present invention is lower than 4%, reaches the interim airtight requirement in down-hole fully.In addition, the present invention also has short, (only 20KG) in light weight, simple to operate, the long advantages such as (under the situations that pressure equaliser has been installed) of holding time of closed-loop operation time.
The present invention can reach good rapid sealing effect.
Claims (3)
1. underground mine use rapid sealing device is characterized in that obturator forms by having hook (1), main body air bag (2), wind locking cloth (3), high-pressure rubber pipe (4), pressure equaliser (5), high-pressure air source (6) stay cord button (7), stay cord (8), unidirectional charging connector (9), chock (10); Hook (1) binds on wind locking cloth (3) with stay cord button (7), two unidirectional charging connectors (9) are installed in the two ends of main body air bag (2), high-pressure air source (6) is connecting high-pressure rubber pipe (4), inflates in main body air bag (2) by unidirectional charging connector (9); Unidirectional charging connector (9), pressure equaliser (5) and high-pressure air source (6) link together by high-pressure rubber pipe (4), and stay cord (8) is fixed on the wall by chock (10), are used to prevent that the excessive wind locking cloth that causes of blast comes off when airtight.
2. a kind of according to claim 1 underground mine use rapid sealing device is characterized in that described main body air bag (2) has to buckle; Unidirectional charging connector (9) is copper; Main body air bag (2) and wind locking cloth (3) are made by the sea otter elastomeric material, and high temperature resistant, wear-resisting and process antistatic is handled, and obtain coal peace sign.
3. a kind of according to claim 1 underground mine use rapid sealing device, it is characterized in that described pressure equaliser is by barometer (11), silk mouthful interface (12), tee piece (13), pneumatic control valve (14), flame proof outer container (15) be with the high-pressure rubber pipe (4) of interface to form, consider the essential safety problem and prevent that pneumatic control valve lost efficacy under the abominable working environment in down-hole, pneumatic control valve (14) adopts full copper or stainless steel, and is placed in the flame proof outer container (15); Pressure equaliser is connected with high-pressure air source (6) by high-pressure rubber pipe (4), forms a complete air supply system, belongs to the most important annex of a whole set of rapid sealing equipment, and it is constant to guarantee that the air bag internal gas pressure remains on the level of setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105806016A CN102061930B (en) | 2010-12-09 | 2010-12-09 | Downhole fast sealing device in coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105806016A CN102061930B (en) | 2010-12-09 | 2010-12-09 | Downhole fast sealing device in coal mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102061930A true CN102061930A (en) | 2011-05-18 |
| CN102061930B CN102061930B (en) | 2012-07-25 |
Family
ID=43997402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105806016A Expired - Fee Related CN102061930B (en) | 2010-12-09 | 2010-12-09 | Downhole fast sealing device in coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102061930B (en) |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536320A (en) * | 2012-02-28 | 2012-07-04 | 山西创奇实业有限公司 | Inflatable temporary replacing device for mine anti-explosion door |
| CN102678175A (en) * | 2012-05-29 | 2012-09-19 | 淮南久辉工贸有限责任公司 | Mining flexible inflatable air bag |
| CN102678176A (en) * | 2012-06-07 | 2012-09-19 | 北京神州广安科技股份有限公司 | Immediate plugging air bag device |
| CN103075192A (en) * | 2013-01-10 | 2013-05-01 | 山西创奇实业有限公司 | Grid type temporary replacing device for footrill and explosion door of inclined shaft |
| CN103133027A (en) * | 2013-01-25 | 2013-06-05 | 李继水 | Fireproofing and gas explosion-proof technology used during easy self-ignition coal seam working face removing and sealing periods |
| CN103174451A (en) * | 2013-01-08 | 2013-06-26 | 李继水 | Fire prevention and extinguishing technology for high-gas-content fully mechanized caving face coal seam prone to spontaneous combustion and in suspension state |
| CN104047628A (en) * | 2014-07-08 | 2014-09-17 | 李继水 | Technology for preventing natural ignition and gas explosion of goaf coal seam by adopting isolation method |
| CN104533522A (en) * | 2014-12-25 | 2015-04-22 | 陆强 | Rapid safe construction method and device for bag poured airtight wall and anti-explosion wall |
| CN104806287A (en) * | 2015-04-15 | 2015-07-29 | 安徽理工大学 | Emergency safety device for isolating mine disaster |
| CN105114125A (en) * | 2015-07-29 | 2015-12-02 | 上海隧道工程有限公司 | Tunnel airbag air filling device and tunnel airbag air filling method |
| CN105952451A (en) * | 2016-07-07 | 2016-09-21 | 北京科技大学 | Air cushion type space-reserving approach road type mining device and method |
| CN106014415A (en) * | 2016-07-07 | 2016-10-12 | 北京科技大学 | Air cushion type space-reserved drift and fill type mining device and method |
| CN106555610A (en) * | 2016-11-17 | 2017-04-05 | 北京科技大学 | A kind of driving face in coal mine Gas Outburst baffle system |
| CN106761924A (en) * | 2016-12-29 | 2017-05-31 | 中国人民解放军63926部队 | A kind of anti-water gushing out with high pressure air bag of pressure self-balancing |
| CN107755283A (en) * | 2017-10-26 | 2018-03-06 | 天津美腾科技有限公司 | Underground coal mine dry separation waste rock discharge device and technique |
| CN108729949A (en) * | 2018-05-21 | 2018-11-02 | 辽宁工程技术大学 | A kind of underground connection roadway rapid sealing device and its application method |
| CN109372579A (en) * | 2018-12-20 | 2019-02-22 | 西安科技大学 | The interim rapid sealing device and method in mine catastrophe region |
| CN110566278A (en) * | 2019-10-17 | 2019-12-13 | 西安科技大学 | rapid closing device and method for mine catastrophe area |
| CN110985115A (en) * | 2019-12-25 | 2020-04-10 | 通用技术集团工程设计有限公司 | Filling device for coal mining of coal mine |
| CN111804102A (en) * | 2020-06-30 | 2020-10-23 | 中国矿业大学 | Distributed closed dry dust removal system for air return gallery and dust removal method thereof |
| WO2020215525A1 (en) * | 2019-04-24 | 2020-10-29 | 山东科技大学 | Temporary isolation wall with double-layer air bags for closed wind path roadway of underground coal mine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958644A (en) * | 1975-07-02 | 1976-05-25 | The United States Of America As Represented By The Secretary Of The Interior | Pressure sensitive explosion barrier |
| CN2085418U (en) * | 1990-10-13 | 1991-09-25 | 宋九成 | Aerocyst type protecting door for coal mine |
| DE29600377U1 (en) * | 1996-01-11 | 1996-04-04 | Ruhrkohle Ag, 45128 Essen | Device for hanging and setting up water troughs serving as an explosion barrier in underground mining and tunnel construction |
| CN2276561Y (en) * | 1996-10-09 | 1998-03-18 | 煤炭科学研究总院南京研究所 | Quick inflation sealing device for providing disaster relief |
| CN2298345Y (en) * | 1997-01-22 | 1998-11-25 | 开滦矿务局 | Quick closed gasbag for mine on fire region |
| CN101813001A (en) * | 2009-02-24 | 2010-08-25 | 张建平 | Multifunctional gas drainage hole packer |
-
2010
- 2010-12-09 CN CN2010105806016A patent/CN102061930B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958644A (en) * | 1975-07-02 | 1976-05-25 | The United States Of America As Represented By The Secretary Of The Interior | Pressure sensitive explosion barrier |
| CN2085418U (en) * | 1990-10-13 | 1991-09-25 | 宋九成 | Aerocyst type protecting door for coal mine |
| DE29600377U1 (en) * | 1996-01-11 | 1996-04-04 | Ruhrkohle Ag, 45128 Essen | Device for hanging and setting up water troughs serving as an explosion barrier in underground mining and tunnel construction |
| CN2276561Y (en) * | 1996-10-09 | 1998-03-18 | 煤炭科学研究总院南京研究所 | Quick inflation sealing device for providing disaster relief |
| CN2298345Y (en) * | 1997-01-22 | 1998-11-25 | 开滦矿务局 | Quick closed gasbag for mine on fire region |
| CN101813001A (en) * | 2009-02-24 | 2010-08-25 | 张建平 | Multifunctional gas drainage hole packer |
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536320A (en) * | 2012-02-28 | 2012-07-04 | 山西创奇实业有限公司 | Inflatable temporary replacing device for mine anti-explosion door |
| CN102678175A (en) * | 2012-05-29 | 2012-09-19 | 淮南久辉工贸有限责任公司 | Mining flexible inflatable air bag |
| CN102678176A (en) * | 2012-06-07 | 2012-09-19 | 北京神州广安科技股份有限公司 | Immediate plugging air bag device |
| CN103174451A (en) * | 2013-01-08 | 2013-06-26 | 李继水 | Fire prevention and extinguishing technology for high-gas-content fully mechanized caving face coal seam prone to spontaneous combustion and in suspension state |
| CN103075192A (en) * | 2013-01-10 | 2013-05-01 | 山西创奇实业有限公司 | Grid type temporary replacing device for footrill and explosion door of inclined shaft |
| CN103133027A (en) * | 2013-01-25 | 2013-06-05 | 李继水 | Fireproofing and gas explosion-proof technology used during easy self-ignition coal seam working face removing and sealing periods |
| CN104047628A (en) * | 2014-07-08 | 2014-09-17 | 李继水 | Technology for preventing natural ignition and gas explosion of goaf coal seam by adopting isolation method |
| CN104533522A (en) * | 2014-12-25 | 2015-04-22 | 陆强 | Rapid safe construction method and device for bag poured airtight wall and anti-explosion wall |
| CN104806287A (en) * | 2015-04-15 | 2015-07-29 | 安徽理工大学 | Emergency safety device for isolating mine disaster |
| CN105114125A (en) * | 2015-07-29 | 2015-12-02 | 上海隧道工程有限公司 | Tunnel airbag air filling device and tunnel airbag air filling method |
| CN105952451A (en) * | 2016-07-07 | 2016-09-21 | 北京科技大学 | Air cushion type space-reserving approach road type mining device and method |
| CN106014415A (en) * | 2016-07-07 | 2016-10-12 | 北京科技大学 | Air cushion type space-reserved drift and fill type mining device and method |
| CN105952451B (en) * | 2016-07-07 | 2018-03-30 | 北京科技大学 | The route type mining apparatus and method of a kind of air-cushion type headspace |
| CN106555610A (en) * | 2016-11-17 | 2017-04-05 | 北京科技大学 | A kind of driving face in coal mine Gas Outburst baffle system |
| CN106761924A (en) * | 2016-12-29 | 2017-05-31 | 中国人民解放军63926部队 | A kind of anti-water gushing out with high pressure air bag of pressure self-balancing |
| CN107755283A (en) * | 2017-10-26 | 2018-03-06 | 天津美腾科技有限公司 | Underground coal mine dry separation waste rock discharge device and technique |
| CN108729949A (en) * | 2018-05-21 | 2018-11-02 | 辽宁工程技术大学 | A kind of underground connection roadway rapid sealing device and its application method |
| CN108729949B (en) * | 2018-05-21 | 2021-06-18 | 辽宁工程技术大学 | Rapid sealing device for underground communication roadway and using method thereof |
| CN109372579A (en) * | 2018-12-20 | 2019-02-22 | 西安科技大学 | The interim rapid sealing device and method in mine catastrophe region |
| CN109372579B (en) * | 2018-12-20 | 2024-01-05 | 西安科技大学 | Temporary rapid closing device and method for mine disaster area |
| WO2020215525A1 (en) * | 2019-04-24 | 2020-10-29 | 山东科技大学 | Temporary isolation wall with double-layer air bags for closed wind path roadway of underground coal mine |
| CN110566278A (en) * | 2019-10-17 | 2019-12-13 | 西安科技大学 | rapid closing device and method for mine catastrophe area |
| CN110985115A (en) * | 2019-12-25 | 2020-04-10 | 通用技术集团工程设计有限公司 | Filling device for coal mining of coal mine |
| CN110985115B (en) * | 2019-12-25 | 2021-06-15 | 通用技术集团工程设计有限公司 | Filling device for coal mining of coal mine |
| CN111804102A (en) * | 2020-06-30 | 2020-10-23 | 中国矿业大学 | Distributed closed dry dust removal system for air return gallery and dust removal method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102061930B (en) | 2012-07-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102061930B (en) | Downhole fast sealing device in coal mine | |
| CN103982203B (en) | A kind of method of blocking the old empty Shuitu water of mine | |
| CN108729949B (en) | Rapid sealing device for underground communication roadway and using method thereof | |
| CN204283489U (en) | Coal mine gob gasbag-type device for filling | |
| CN109372579B (en) | Temporary rapid closing device and method for mine disaster area | |
| CN110107353A (en) | A kind of gushing water emergency shutoff method and its water blocking device | |
| CN104139931B (en) | A kind of outer floating roof petroleum storage tank first and second seals space to be prevented firing safety device | |
| CN203463147U (en) | Laneway plugging airbag | |
| CN104234750A (en) | Rapid self-built movable sluice wall of mine and construction method of rapid self-built movable sluice wall | |
| CN203948127U (en) | A kind of divider wall fast | |
| CN104047628A (en) | Technology for preventing natural ignition and gas explosion of goaf coal seam by adopting isolation method | |
| CN104481572B (en) | A kind of method and device of underground coal mine liquid carbon dioxide passivity fireproof fire-extinguishing | |
| CN105445095A (en) | Bearing frame for simulating stress state of deep rock mass | |
| US7708070B2 (en) | Shaft plugging system | |
| CN109653796B (en) | Air bag type quick air leakage blocking device for end of fully mechanized caving face | |
| CN205297457U (en) | A hole sealing device for determining gas pressure | |
| CN201103416Y (en) | Tunnel automatic fast closing device | |
| CN203702224U (en) | Explosion-proof well lid device | |
| CN106223921B (en) | A kind of gas fracturing device | |
| CN2276561Y (en) | Quick inflation sealing device for providing disaster relief | |
| CN203717031U (en) | Quick sealing device for coal mine gobs | |
| CN102678176A (en) | Immediate plugging air bag device | |
| CN205558865U (en) | Gas drainage hole sealing slip casting device for coal mine | |
| GB1376237A (en) | Method of testing for and sealing leaks in pipes | |
| CN106759094B (en) | A kind of Water emergency flood control dam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20141209 |
|
| EXPY | Termination of patent right or utility model |