CN205404530U - But angle of adjustment's mining hole sealing material performance test device - Google Patents
But angle of adjustment's mining hole sealing material performance test device Download PDFInfo
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- CN205404530U CN205404530U CN201620129815.4U CN201620129815U CN205404530U CN 205404530 U CN205404530 U CN 205404530U CN 201620129815 U CN201620129815 U CN 201620129815U CN 205404530 U CN205404530 U CN 205404530U
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- coal dust
- slip casting
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Abstract
The utility model discloses a but angle of adjustment's mining hole sealing material performance test device, including liftable support, sealing drum, axial pressure device, water injection device, slip casting system and gas tightness detecting system, sealing drum fixed mounting is on the liftable support, and the sealing drum packing element and urceolus between constitutes confined water injection room to interior including urceolus, packing element and floral tube by outer, constitutes the buggy room between floral tube and the packing element, constitutes the slip casting room in the floral tube, water injection device and water injection room intercommunication for increasing the pressurized -water to the water injection room and promoting packing element radial compression buggy room, axial pressure device installs in buggy room one end and is used for axial compression buggy room, and the slip casting system is used for to the indoor injection hole sealing material of slip casting, and gas tightness detecting system is used for detecting slip casting room sealing performance. The utility model discloses an apply axial pressure and confined pressure to the buggy, come the ambient stress really that the coal seam was located under the simulation well to can simulate required hole sealing execution conditions under the condition of different inclinations.
Description
Technical field
This utility model relates to a kind of material seal technical field of performance test, particularly to the mining sealing material performance testing device of a kind of adjustable angle.
Background technology
Gas as one of big disaster of underground coal mine five, also a kind of clean energy resource.At present, administer gas problem it is crucial that gas pumping, and down-hole sealing quality is the key of gas pumping.Down-hole sealing of hole is to utilize capsule, polyurethane to form one section to close space, then utilizes grouting pump by sealing material injection hole.But, when laboratory carries out the test of sealing material sealing property, serosity is injected in steel pipe or pvc pipe often, utilizes steel pipe or pvc pipe to replace boring, and then in the pipe that serosity is injected, recycling vacuum pump is bled, and then the sealing property of test material.In this respect, relevant scholar has studied.
In existing document on the books, by one layer of coal dust of pvc pipe inwall snearing, simulate mash gas pumping drilling, and then carry out the sealing property (Li Min, the experimentation of colliery polyurethane sealing of hole, The Chinese Geology Univ. (Beijing), 2011) of polyurethane；Utilizing the seamless steel pipe simulation boring of inner wall coarse, steel pipe two ends arrange plug, inject sealing material between plug, and then carry out determination (Ni Guanhua, the mensuration of pulsed hydraulic fracturing borehole sealing parameter and analysis, China Mining University's journal of sealing of hole parameter, 2013,42(2))；Utilize pvc pipe simulation boring, simulate crack by the hole that diameter on pvc pipe is different, adopt the method for " two stifled notes " to carry out sealing of hole performance test (Cheng Yanying, this coal bed drilling gas pumping inefficacy mechanism and the efficient sealed technical research of material, China Mining University, 2014).
By analyzing above it is found that in encapsulant sealing property test, mostly have ignored the impact of crustal stress and dip angle of hole.In consideration of it, the present inventor develops the mining sealing material performance testing device of a kind of adjustable angle for this, effectively solving the problems referred to above, this case thus produces.
Utility model content
The mining sealing material performance testing device of a kind of adjustable angle that this utility model provides, by coal dust being applied axial compressive force and confined pressure, simulate down-hole coal bed residing ambient stress truly, solve because ignoring crustal stress, and material sealing of hole performance can not be made the problem of reasonable assessment, and sealing of hole execution conditions required when different angle can be simulated.
To achieve these goals, the technical solution of the utility model is as follows:
A kind of mining sealing material performance testing device of adjustable angle, including liftable bearing, sealing drum, axial pressurizing device, water filling device, filling system and air tightness detection system, sealing drum is fixedly mounted on liftable bearing, the inclination angle of sealing drum is regulated by liftable bearing, sealing drum includes urceolus, rubber tube and floral tube from outside to inside, constitute the water filling room of closing between rubber tube and urceolus, between floral tube and rubber tube, constitute coal dust room, in floral tube, constitute slip casting room；Coal dust indoor filling coal dust, water filling device connects with water filling room, water filling device promotes rubber tube radial compression coal dust room for increasing setting-out to water filling room, axial pressurizing device is installed on one end, coal dust room for axially compressing coal dust room, filling system connects with slip casting room for slip casting indoor injection sealing material, and air tightness detection system also connects with slip casting room and is used for detecting slip casting room sealing property.
Described liftable bearing has the supporting leg being made up of hydraulic hand-pump.
Described water filling device includes water pump, water injection pipe, water pressure gauge and Water filling valve, and water pump is connected with water filling room by water injection pipe, and water injection pipe is provided with water pressure gauge.
Described axial pressurizing device includes squeeze board, pressure rod, hydraulic means, hydraulic tube and hydraulic control system, hydraulic control system is connected with hydraulic means by hydraulic tube, hydraulic means is provided with pressure rod, squeeze board is installed in pressure rod front end, squeeze board is ringwise, squeeze board is set in outside floral tube and is pressed on one end of coal dust room, and pressure rod promotes squeeze board axially to compress coal dust, and one end of this coal dust room is sealed by squeeze board.
Described filling system includes slip casting end, grouting pump, Grouting Pipe and grouting pressure table, slip casting end is sealingly mounted at one end of floral tube, slip casting end has the pulp-inlet pipe and grout outlet that connect with floral tube, pulp-inlet pipe and grout outlet are separately installed with slip casting valve and overfall valve, grouting pump is connected with pulp-inlet pipe by Grouting Pipe, and Grouting Pipe is provided with grouting pressure table.
Described filling system and air tightness detection system are separately mounted to the two ends of floral tube, air tightness detection system includes evacuation end, vacuum pump, vacuum tube, vacuum tube valve and vacuum meter, evacuation end is sealingly mounted at one end of floral tube, floral tube is provided with dividing plate in the inner side near this end, floral tube is separated into two sections by dividing plate, one section is slip casting room, another section and evacuation end collectively form vacuum chamber, vacuum tube one end is connected with floral tube by evacuation end, the vacuum tube other end and vacuum pump connect, and vacuum tube is provided with vacuum tube valve and vacuum meter.
Described coal dust room seals in the one end being positioned at axial pressurizing device, the ringwise seal closure sealed is installed at the other end, the inner hole wall of seal closure offers seal groove, seal groove is for keeping sealing with floral tube, offering passage on seal closure, passage is undertaken blocking or ventilating by installing or removing bolt.
Described coal dust room is provided with the feeding device of coal dust in the one end being positioned at axial pressurizing device, and feeding device includes feed pipe, loading hopper and reinforced valve, and loading hopper is connected with coal dust room by feed pipe, and loading hopper is installed below reinforced valve.
After adopting such scheme, sealing drum of the present utility model is divided into three layers, increase coal dust room and water filling room, coal dust room is used for filling more coal dust, then pass through water filling device and increase setting-out to water filling room, promote rubber tube radial compression coal dust room, thus coal dust is loaded confined pressure, coal dust room is axially compressed by axial pressurizing device, thus coal dust is loaded axial compression, simulate down-hole coal bed residing ambient stress truly, the sealing property of the sealing material therefore detected by air tightness detection system, it is more nearly sealing material sealing property during true use, solve because ignoring crustal stress, and the problem that material sealing of hole performance can not be made reasonable assessment.Regulated the inclination angle of sealing drum, sealing of hole execution conditions required when to simulate different angle by liftable bearing simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present embodiment；
Fig. 2 is the front view of the present embodiment seal closure；
Fig. 3 is that the A-A of Fig. 2 is to sectional view.
Label declaration
nullSealing drum 1，Urceolus 11，Rubber tube 12，Floral tube 13，Dividing plate 14，Seal closure 15，Seal groove 151，Passage 152，Axial pressurizing device 2，Squeeze board 21，Pressure rod 22，Hydraulic means 23，Hydraulic tube 24，Hydraulic control system 25，Water filling device 3，Water pump 31，Water injection pipe 32，Water pressure gauge 33，Water filling valve 34，Filling system 4，Slip casting end 41，Pulp-inlet pipe 411，Grout outlet 412，Slip casting valve 413，Overfall valve 414，Grouting pump 42，Grouting Pipe 43，Grouting pressure table 44，Air tightness detection system 5，Evacuation end 51，Vacuum pump 52，Vacuum tube 53，Vacuum tube valve 54，Vacuum meter 55，Water filling room 6，Coal dust room 7，Slip casting room 8，Feeding device 9，Feed pipe 91，Loading hopper 92，Reinforced valve 93，Vacuum chamber 10，Liftable bearing 20，Hydraulic hand-pump 201，Rocking handle 202.
Detailed description of the invention
In order to the technical solution of the utility model is explained further, below by specific embodiment, the utility model is elaborated.
As it is shown in figure 1, be the mining sealing material performance testing device of a kind of adjustable angle that discloses of this utility model, including liftable bearing 20, sealing drum 1, axial pressurizing device 2, water filling device 3, filling system 4 and air tightness detection system 5.
Sealing drum 1 is fixedly mounted on liftable bearing 20, is regulated the inclination angle of sealing drum 1 by liftable bearing 20.The supporting leg of the present embodiment liftable bearing 20 is hydraulic hand-pump 201, controls the flexible of supporting leg by pressing the rocking handle 202 of hydraulic hand-pump 201, thus changing the inclination angle of sealing drum 1.
Sealing drum 1 includes urceolus 11, rubber tube 12 and floral tube 13 from outside to inside, constitutes the water filling room 6 of closing between rubber tube 12 and urceolus 11, constitutes coal dust room 7 between floral tube 13 and rubber tube 12, constitutes slip casting room 8 in floral tube 13.Coal dust is filled in coal dust room 7.In the industry, floral tube refers to have very lacunary steel pipe.
Water filling device 3 connects with water filling room 6, and water filling device 3 promotes rubber tube 12 radial compression coal dust room 7 for increasing setting-out to water filling room 6.The water filling device 3 of the present embodiment includes water pump 31, water injection pipe 32, water pressure gauge 33 and Water filling valve 34, water pump 31 is connected with water filling room 6 by water injection pipe 32, being provided with water pressure gauge 33 on water injection pipe 32, the registration shown by water pressure gauge 33 carrys out the confined pressure size of controlled loading.
Axial pressurizing device 2 is installed on one end, coal dust room 7, for axially compression coal dust room 7.The axial pressurizing device 2 of the present embodiment includes squeeze board 21, pressure rod 22, hydraulic means 23, hydraulic tube 24 and hydraulic control system 25.Hydraulic control system 25 is connected with hydraulic means 23 by hydraulic tube 24, and hydraulic means 23 is provided with pressure rod 22.Pressure rod 22 front end is by U-shaped folder and the fixing connection of squeeze board 21, and ringwise, squeeze board 21 is set in outside floral tube 13 and is pressed on one end of coal dust room 7 squeeze board 21, and one end of this coal dust room 7 is sealed by squeeze board 21.Hydraulic control system 25 provides pressure, hydraulic means 23 to drive pressure rod 22 to promote squeeze board 21 axially to compress coal dust for hydraulic means 23, is carried out the axial compression size of controlled loading by hydraulic control system 25.
The true coal seam under varying environment can be simulated by regulating confined pressure and axial compression.
Filling system 4 and air tightness detection system 5 are separately mounted to the two ends of floral tube 13.
Filling system 4 connects with slip casting room 8, for injecting sealing material in slip casting room 8.The filling system 4 of the present embodiment includes slip casting end 41, grouting pump 42, Grouting Pipe 43 and grouting pressure table 44.Slip casting end 41 is sealingly mounted at one end of floral tube 13, and slip casting end 41 has the pulp-inlet pipe 411 and grout outlet 412 that connect with floral tube 13, and pulp-inlet pipe 411 and grout outlet 412 are separately installed with slip casting valve 413 and overfall valve 414.Grouting pump 42 is connected with pulp-inlet pipe 411 by Grouting Pipe 43, and Grouting Pipe 43 is provided with grouting pressure table 44.Namely be can read the pressure of slip casting by this grouting pressure table 44, in order to determine under different coal, when grouting pressure is much, just can possess good sealing of hole performance.
Air tightness detection system 5 is for detecting the air-tightness of whole device, thus the sealing property of indirect detection sealing material.The air tightness detection system 5 of the present embodiment includes evacuation end 51, vacuum pump 52, vacuum tube 53, vacuum tube valve 54 and vacuum meter 55, and evacuation end 51 is sealingly mounted at floral tube 13 and differs from one end of filling system 4.Floral tube 13 is provided with dividing plate 14 in the inner side near this end, and floral tube 13 is separated into two sections by dividing plate 14, and one section is slip casting room 8, and another section and evacuation end 51 collectively form vacuum chamber 10.Vacuum tube 53 one end is connected with floral tube 13 by evacuation end 51, and vacuum tube 53 other end and vacuum pump 52 connect, and vacuum tube 53 is provided with vacuum tube valve 54 and vacuum meter 55.By by vacuum chamber 10 evacuation, namely the registration change then observing vacuum meter 55 can determine that sealing property
After installing whole device, it is desirable to carry out the air-leakage test of whole device, with the accuracy of guarantee test.For this coal dust room 7 be positioned at axial pressurizing device 2 one end seal, can pass through squeeze board 21 seal, the other end be provided with seal ringwise seal closure 15(as Figure 2-3).The inner hole wall of seal closure 15 offers seal groove 151, and seal groove 151 is for keeping sealing with floral tube 13.Offering passage 152 on seal closure 15, passage 152 is undertaken blocking or ventilating by installing or removing bolt, completes to seal after namely installing bolt, and after pulling down bolt, coal dust room 7 can connect air.
In order to convenient reinforced, coal dust room 7 is provided with the feeding device 9 of coal dust in the one end being positioned at axial pressurizing device 2, feeding device 9 includes feed pipe 91, loading hopper 92 and reinforced valve 93, and loading hopper 92 is connected with coal dust room 7 by feed pipe 91, and loading hopper 92 is installed below reinforced valve 93.
The using method of the mining sealing material performance testing device of the present embodiment, uses step as follows:
(1) Preparatory work of experiment: cleaning sealing drum 1, it is ensured that floral tube 13, rubber tube 12 inwall carry out the installation of equipment after totally not having residue.
The step that equipment is installed is: fixed by urceolus 11, seal closure 15 is installed to one end of coal dust room 7, passage 152 on seal closure 15 is utilized bolt seal simultaneously, and floral tube 13 is sent in sealing drum 1 by seal closure 15 endoporus, by sheathed for squeeze board 21 one end, coal dust room 7 that is on floral tube 13, the pressure rod 22 of squeeze board 21 and axial pressurizing device 2 links together, by axial pressurizing device 2, squeeze board 21 is retreated to low order end, form maximum coal dust room 7, the slip casting end 41 of filling system 4 is installed together with floral tube 13 one end, the evacuation end 51 of air tightness detection system 5 is installed together with floral tube 13 other end, the water injection pipe 32 of water filling device 3 is connected with water filling room 6, the feed pipe 91 of feeding device 9 is connected with coal dust room 7.1 to one inclination angle of sealing drum is regulated by liftable bearing 20.
(2) simulation boring is formed: loaded by coal dust in coal dust room 7, until coal dust fills coal dust room 7；
The step forming simulation boring is: utilize axial pressurizing device 2 that squeeze board 21 retreats to coal dust room 7 low order end, feed pipe 91 is sent into coal dust room 7, open reinforced valve 93, by loading hopper 92, coal dust is loaded in coal dust room 7, in loading procedure, utilize tamper to be smash by coal dust into coal dust room 7, it is internal that recycling axial pressurizing device 2 promotes squeeze board 21 that coal dust is sent into coal dust room 7, then squeeze board 21 retreats to low order end, and circulation is according to this step, until coal dust fills coal dust room 7.
(3) confined pressure, axial compression are loaded: utilize axial pressurizing device 2 that coal dust is loaded axial compression, utilizing water filling device 3 to increase setting-out to water filling room 6 promotes rubber tube 12 to compress coal dust room 7 to load confined pressure, when pressure residing for coal dust reaches mine physical condition, keep this pressure to the stipulated time.
Carrying out the airtight test of whole device, step is:
Bolt on seal closure 15 is installed, close slip casting valve 413, overfall valve 414, Water filling valve 34, reinforced valve 93, utilize vacuum pump 52 that vacuum chamber 10 is taken out negative pressure, when vacuum meter 55 registration reaches-0.1MPa, close vacuum tube valve 54 and vacuum pump 52, keep 1h, observing the change of vacuum meter 55 registration, registration is unchanged, then device air-tightness is good, otherwise device is carried out inspection to reinstall, then retest.
Coal dust room 7 connects air: taken off by the bolt on seal closure 15, makes coal dust room 7, slip casting room 8 and vacuum chamber 10 and atmosphere.
(4) slip casting: utilize filling system 4 to note, in slip casting room 8, the serosity being made up of sealing material, when slurry pressure reaches setting pressure, stops slip casting, keeps this pressure；
Concretely comprising the following steps of slip casting: open slip casting valve 413, overfall valve 414, by Grouting Pipe 43 to slip casting in slip casting room 8, when having serosity to flow out in grout outlet 412, close overfall valve 414, and continue to slip casting in slip casting room 8, when slurry pressure reaches setting pressure, close slip casting valve 413, keep this pressure.
(5) sealing of hole performance detection: after band grout cures, utilize air tightness detection system 5 to detect the sealing property of slip casting room 8；
Concretely comprising the following steps of sealing of hole performance detection: utilize vacuum pump 52 to vacuum chamber 10 evacuation, when vacuum meter 55 registration reaches-0.1MPa, closes vacuum tube valve 54 and vacuum pump 52, observes the change of vacuum meter 55 registration, to determine the sealing property of sealing material.
(6) instrument arranges: after experiment terminates, first Water filling valve 34 is slowly opened, water in water filling room 6 is released, after treating that water discharges, open vacuum tube valve 54, water pressure gauge 33, grouting pressure table 44 and vacuum meter 55 are taken off, open seal closure 15, utilize axial pressurizing device 2 that coal dust is released coal dust room 7, floral tube 13 is taken out, clear up instrument and equipment.
Sealing drum 1 of the present utility model is divided into three layers, increase coal dust room 7 and water filling room 6, coal dust room 7 is used for filling more coal dust, then pass through water filling device 3 and increase setting-out to water filling room 6, promote rubber tube 12 radial compression coal dust room 7, thus coal dust is loaded confined pressure, axially compressed coal dust room 7 by axial pressurizing device 2, thus coal dust is loaded axial compression, simulate down-hole coal bed residing ambient stress truly.The sealing property of the sealing material therefore detected by air tightness detection system 5, the sealing property of sealing material when being more nearly true use, it is to avoid because ignoring crustal stress, and the problem that material sealing of hole performance can not be made reasonable assessment.
And regulate sealing drum 1 test to different inclination angles by liftable bearing 20, sealing of hole condition when different angle can be simulated, time such as to the bored grouting at certain inclination angle, required grouting pressure is much, just can have good sealing of hole performance.
These are only preferred embodiment of the present utility model, not the restriction to protection domain of the present utility model.All equivalent variations done according to the mentality of designing of this case, each fall within the protection domain of this case.
Claims (8)
1. the mining sealing material performance testing device of an adjustable angle, it is characterized in that: include liftable bearing, sealing drum, axial pressurizing device, water filling device, filling system and air tightness detection system, sealing drum is fixedly mounted on liftable bearing, the inclination angle of sealing drum is regulated by liftable bearing, sealing drum includes urceolus, rubber tube and floral tube from outside to inside, the water filling room of closing is constituted between rubber tube and urceolus, constitute coal dust room between floral tube and rubber tube, in floral tube, constitute slip casting room；Coal dust indoor filling coal dust, water filling device connects with water filling room, water filling device promotes rubber tube radial compression coal dust room for increasing setting-out to water filling room, axial pressurizing device is installed on one end, coal dust room for axially compressing coal dust room, filling system connects with slip casting room for slip casting indoor injection sealing material, and air tightness detection system also connects with slip casting room and is used for detecting slip casting room sealing property.
2. the mining sealing material performance testing device of a kind of adjustable angle as claimed in claim 1, it is characterised in that: described liftable bearing has the supporting leg being made up of hydraulic hand-pump.
3. the mining sealing material performance testing device of a kind of adjustable angle as claimed in claim 1, it is characterized in that: described water filling device includes water pump, water injection pipe, water pressure gauge and Water filling valve, water pump is connected with water filling room by water injection pipe, and water injection pipe is provided with water pressure gauge.
4. the mining sealing material performance testing device of a kind of adjustable angle as claimed in claim 1, it is characterized in that: described axial pressurizing device includes squeeze board, pressure rod, hydraulic means, hydraulic tube and hydraulic control system, hydraulic control system is connected with hydraulic means by hydraulic tube, hydraulic means is provided with pressure rod, squeeze board is installed in pressure rod front end, squeeze board is ringwise, squeeze board is set in outside floral tube and is pressed on one end of coal dust room, pressure rod promotes squeeze board axially to compress coal dust, and one end of this coal dust room is sealed by squeeze board.
5. the mining sealing material performance testing device of a kind of adjustable angle as claimed in claim 1, it is characterized in that: described filling system includes slip casting end, grouting pump, Grouting Pipe and grouting pressure table, slip casting end is sealingly mounted at one end of floral tube, slip casting end has the pulp-inlet pipe and grout outlet that connect with floral tube, pulp-inlet pipe and grout outlet are separately installed with slip casting valve and overfall valve, grouting pump is connected with pulp-inlet pipe by Grouting Pipe, and Grouting Pipe is provided with grouting pressure table.
6. the mining sealing material performance testing device of a kind of adjustable angle as claimed in claim 1, it is characterized in that: described filling system and air tightness detection system are separately mounted to the two ends of floral tube, air tightness detection system includes evacuation end, vacuum pump, vacuum tube, vacuum tube valve and vacuum meter, evacuation end is sealingly mounted at one end of floral tube, floral tube is provided with dividing plate in the inner side near this end, floral tube is separated into two sections by dividing plate, one section is slip casting room, another section and evacuation end collectively form vacuum chamber, vacuum tube one end is connected with floral tube by evacuation end, the vacuum tube other end and vacuum pump connect, vacuum tube is provided with vacuum tube valve and vacuum meter.
7. the mining sealing material performance testing device of a kind of adjustable angle as claimed in claim 1, it is characterized in that: described coal dust room seals in the one end being positioned at axial pressurizing device, the ringwise seal closure sealed is installed at the other end, the inner hole wall of seal closure offers seal groove, seal groove is for keeping sealing with floral tube, offering passage on seal closure, passage is undertaken blocking or ventilating by installing or removing bolt.
8. the mining sealing material performance testing device of a kind of adjustable angle as claimed in claim 1, it is characterized in that: described coal dust room is provided with the feeding device of coal dust in the one end being positioned at axial pressurizing device, feeding device includes feed pipe, loading hopper and reinforced valve, loading hopper is connected with coal dust room by feed pipe, and loading hopper is installed below reinforced valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620129815.4U CN205404530U (en) | 2016-02-19 | 2016-02-19 | But angle of adjustment's mining hole sealing material performance test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620129815.4U CN205404530U (en) | 2016-02-19 | 2016-02-19 | But angle of adjustment's mining hole sealing material performance test device |
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| CN205404530U true CN205404530U (en) | 2016-07-27 |
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| CN201620129815.4U Expired - Fee Related CN205404530U (en) | 2016-02-19 | 2016-02-19 | But angle of adjustment's mining hole sealing material performance test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900549A (en) * | 2019-04-24 | 2019-06-18 | 龙岩学院 | A kind of Leaking Stoppage in Coal Mine wind material properties test device and its application method |
| CN110107279A (en) * | 2019-04-29 | 2019-08-09 | 淮阴工学院 | A kind of gas sealing of hole ground simulating device |
-
2016
- 2016-02-19 CN CN201620129815.4U patent/CN205404530U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900549A (en) * | 2019-04-24 | 2019-06-18 | 龙岩学院 | A kind of Leaking Stoppage in Coal Mine wind material properties test device and its application method |
| CN109900549B (en) * | 2019-04-24 | 2024-02-06 | 龙岩学院 | Device for testing performance of coal mine air plugging material and application method thereof |
| CN110107279A (en) * | 2019-04-29 | 2019-08-09 | 淮阴工学院 | A kind of gas sealing of hole ground simulating device |
| CN110107279B (en) * | 2019-04-29 | 2022-05-17 | 淮阴工学院 | Gas hole sealing ground simulation experiment device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20200219 |
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