CN117569796B - Dynamic monitoring device for gas pressure in mine - Google Patents
Dynamic monitoring device for gas pressure in mine Download PDFInfo
- Publication number
- CN117569796B CN117569796B CN202410012830.XA CN202410012830A CN117569796B CN 117569796 B CN117569796 B CN 117569796B CN 202410012830 A CN202410012830 A CN 202410012830A CN 117569796 B CN117569796 B CN 117569796B
- Authority
- CN
- China
- Prior art keywords
- water injection
- supporting rods
- outer tube
- slip casting
- pipe
- 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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Links
- 238000012806 monitoring device Methods 0.000 title claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 238000007569 slipcasting Methods 0.000 claims abstract description 15
- 210000003097 mucus Anatomy 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 28
- 230000000903 blocking effect Effects 0.000 description 12
- 239000002002 slurry Substances 0.000 description 10
- 239000003245 coal Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002699 waste material Substances 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
Landscapes
- 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)
- Geophysics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The utility model provides a gas pressure dynamic monitoring device in mine, belongs to colliery exploitation technical field, and the device includes outer tube, shutoff mechanism and retaining ring mechanism, outer tube input and output are all fixed and are provided with shutoff mechanism, set up piezometer tube, slip casting pipe and water injection pipe in the outer tube, wherein piezometer tube passes from the outer tube is inside, opens slip casting mouth and water injection mouth on the outer tube lateral wall, slip casting pipe and slip casting mouth intercommunication, water injection mouth and water injection pipe intercommunication, retaining ring mechanism cover is on slip casting mouth and water injection mouth. According to the invention, the elastic sealing gasket can be effectively attached to each part of the borehole wall through the circumferentially arranged supporting rods and the supporting rods which are slidably arranged in the supporting rods, so that the plugging mechanism is not influenced by the borehole wall, and the supporting rods are arranged in two rows, so that the plugging area of the elastic sealing gasket can be effectively increased, the sealing effect of the elastic sealing gasket is improved, and after monitoring is finished, the mucus is flushed out by filling the cleaning water into the water injection pipe, thereby facilitating the outer pipe to be taken out for recycling.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a dynamic monitoring device for gas pressure in a mine.
Background
The coal mine gas is harmful gas mainly composed of coal bed gas and mainly composed of methane, and in the coal mine exploitation process, the gas in the exploitation designated area must be monitored in real time, so that gas accidents caused by too high gas concentration in the exploitation area are avoided, and even the life safety of workers is seriously threatened.
At present, for monitoring gas pressure, a borehole is drilled into a coal seam in normal times, a pressure measuring pipe is placed in the borehole, after the borehole is plugged, the pressure is measured by a pressure monitoring mechanism, in order to measure the original gas pressure of the coal seam, the borehole is required to be tightly plugged, in the existing plugging method, the plugging effect of the rubber ring pressure mucus hole packer is better, the borehole is plugged by using the rubber ring, and then the borehole crack is plugged by using mucus, so that the sealing effect is better, but the plugging of the rubber ring is easily influenced by the borehole wall, only the smooth borehole can be tightly plugged, when the borehole wall is irregular, the sealing performance is poor, and the hole packer is very inconvenient to take out after the monitoring is finished.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the dynamic monitoring device for the gas pressure in the mine, so that the plugging mechanism is not influenced by the wall of a drilling hole, the sealing effect of the plugging mechanism is improved, quick plugging and quick monitoring are performed, and the device can be taken out for recycling.
In order to achieve the above object, the technical scheme of the present invention is as follows:
The utility model provides a gas pressure dynamic monitoring device in mine, includes outer tube, shutoff mechanism and retaining ring mechanism, outer tube input and output are all fixed to be provided with shutoff mechanism, set up piezometer tube, slip casting pipe and water injection pipe in the outer tube, wherein the piezometer tube passes from the outer tube is inside, and open slip casting mouth and water injection mouth on the outer tube lateral wall, slip casting pipe and slip casting mouth intercommunication, water injection mouth and water injection pipe intercommunication, retaining ring mechanism cover is on slip casting mouth and water injection mouth, piezometer tube external connection has pressure monitoring mechanism.
Further, the shutoff mechanism includes base, drive ring, branch, off-set seat and vaulting pole, the base is the annular, and the fixed extension board that is provided with in base both sides, drive ring rotates to set up between two extension boards, and symmetrical rotation is provided with a plurality of off-set seat on two extension boards, and the off-set seat generally sets up sixteen to twenty-two pairs, offered on the off-set seat with the same round hole of branch diameter, drive ring border bilateral symmetry articulates there are a plurality of branches, and branch quantity equals with the off-set seat quantity, in the round hole on the off-set seat in corresponding position was passed to the other end of branch, has seted up the spout on the branch, and the vaulting pole slides and sets up in the spout, and the vaulting pole is fixed through spring one with the spout piece is connected.
Further, an elastic sealing pad is fixedly arranged between the support plates, an air inflation cavity is fixedly arranged on the driving ring, an air bag is arranged between the air inflation cavity and the elastic sealing pad, and a rotating wheel is rotatably arranged at the front end of the supporting rod.
Further, the base is fixedly provided with a hydraulic cavity, the inner side of the driving ring is provided with a groove, a push rod is fixedly arranged in the groove, and the push rod can slide along the hydraulic cavity in a sealing manner.
Further, the retaining ring mechanism comprises a retaining seat and a retaining ring, the retaining seat is fixedly arranged on the outer tube, the retaining ring is sealed and rotationally arranged on the retaining seat, two first through holes are formed in the retaining seat and are respectively communicated with the grouting opening and the water injection opening, and two second through holes are formed in the retaining ring.
Further, the second through hole is communicated with the first through hole through the rotation of the baffle ring; and the through holes two are communicated with only one through hole one at a time.
Further, the baffle seat is fixedly provided with a sealing cavity, the baffle ring is provided with a sliding plate, the sliding plate can slide along the sealing cavity in a sealing way, and the sliding plate is connected with the sealing cavity through a second spring.
Further, the grouting pipe is connected with the mucus tank through a pressurizing pump.
The invention has the beneficial effects that:
According to the invention, the plugging mechanism is provided, the elastic sealing gasket can be effectively attached to each part of the drilling hole wall through the supporting rods which are arranged in the circumference and the supporting rods which are arranged in the supporting rods in a sliding manner, so that the plugging mechanism is not influenced by the drilling hole wall, the supporting rods are arranged in two rows, the plugging area of the elastic sealing gasket can be effectively increased, the sealing effect of the elastic sealing gasket is improved, the elastic sealing gasket is fully supported by the air bags to be attached to the drilling hole wall, the sealing performance of the elastic sealing gasket is further improved, and therefore quick plugging and quick monitoring are performed, the grouting pipe and the water injection port are arranged in the outer pipe, the drilling hole can be flushed before monitoring, the gas pressure of an original medium is monitored, and after monitoring, the cleaning water is filled into the water injection pipe to flush out mucus, the outer pipe is conveniently taken out for repeated use, and the check ring mechanism is arranged, so that the grouting port is not communicated with the water injection port, the cleaning work and the grouting work are effectively separated, the cleaning water is prevented from influencing the mucus, and the sealing effect of the drilling pipe is affected.
Drawings
FIG. 1 is a schematic cross-sectional view of an overall structure provided by the present invention;
FIG. 2 is a schematic view of the structure of an outer tube provided by the present invention;
FIG. 3 is a schematic diagram of a plugging mechanism according to the present invention;
FIG. 4 is an enlarged schematic view of a portion of the plugging mechanism provided by the present invention;
fig. 5 is a schematic structural view of a retainer mechanism provided by the present invention.
Reference numerals in the drawings of the specification include:
1-an outer tube; 2-a plugging mechanism; 21-a base; 211-supporting plates; 212-a hydraulic chamber; 22-a drive ring; 221-inflating the cavity; 222-groove; 223-push rod; 23-supporting rods; 24-deflection seat; 25-stay bars; 251-turning wheel; 26-spring one; 27-an elastic gasket; 28-an air bag; 3-pressure measuring tube; 4-grouting pipe; 5-a water injection pipe; 6-a check ring mechanism; 61-a baffle seat; 62-baffle ring; 621-skateboard; 63-via one; 64-a second through hole; 65-sealing the cavity; 7-drilling holes; 8-coal seam.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention.
As shown in fig. 1 to 5, the dynamic monitoring device for gas pressure in a mine comprises an outer tube 1, a plugging mechanism 2 and a check ring mechanism 6, wherein the plugging mechanism 2 is fixedly arranged at the input end and the output end of the outer tube 1, a pressure measuring tube 3, a grouting tube 4 and a water injection tube 5 are arranged in the outer tube 1, the pressure measuring tube 3 penetrates through the outer tube 1, a grouting opening and a water injection opening are formed in the side wall of the outer tube 1, the grouting tube 4 is communicated with the grouting opening, the water injection opening is communicated with the water injection tube 5, and the check ring mechanism 6 is sleeved on the grouting opening and the water injection opening.
The plugging mechanism 2 comprises a base 21, a driving ring 22, supporting rods 23, deflection seats 24 and supporting rods 25, wherein the base 21 is annular, supporting plates 211 are fixedly arranged on two sides of the base 21, the driving ring 22 is rotatably arranged between the two supporting plates 211, a plurality of deflection seats 24 are symmetrically rotatably arranged on the two supporting plates 211, sixteen to twenty-two pairs of deflection seats are generally arranged on the deflection seats, round holes with the diameter identical to that of the supporting rods 23 are formed in the deflection seats 24, a plurality of supporting rods 23 are symmetrically hinged to two sides of the circumference of the driving ring 22, the quantity of the supporting rods 23 is equal to that of the deflection seats 24, the other ends of the supporting rods 23 penetrate through the round holes in the deflection seats 24 at corresponding positions, sliding grooves are formed in the supporting rods 23, the supporting rods 25 are slidably arranged in the sliding grooves, and the supporting rods 25 are fixedly connected with the sliding groove pieces through springs one 26. An elastic sealing pad 27 is fixedly arranged between the support plates 211, an air inflation cavity 221 is fixedly arranged on the driving ring 22, an air bag 28 is arranged between the air inflation cavity 221 and the elastic sealing pad 27, and a rotating wheel 251 is rotatably arranged at the front end of the support rod 25. When in use, the supporting rod 23 is supported towards the outside of the base 21 under the action of the driving ring 22 and the deflection seat 24, and pushes the elastic sealing gasket 27 to expand and prop against the inner wall of the drilling hole 7, in the process, the supporting rod 23 is supported in a circumferential shape and can be fully distributed on the inner wall of the drilling hole 7, the supporting rod 25 is preferentially contacted with the inner wall of the drilling hole 7, and is tightly supported on the inner wall of the drilling hole 7 under the action of a spring to ensure the tightness, and then the elastic sealing gasket 27 is fully supported by the air bag 28 to be tightly attached to the inner wall of the drilling hole 7, so that the drilling hole 7 is tightly plugged. The front end of each stay bar 25 is provided with a rotating wheel 251 which can roll along the surface of each elastic sealing pad 27 when contacting the elastic sealing pad 27 in the propping process, so that abrasion to the elastic sealing pad 27 when the stay bar 25 is propped up is effectively avoided, the stay bar 25 is slidably arranged on each support bar 23 due to the fact that the inner wall of each drill hole 7 is irregular, a spring is arranged between each stay bar 25 and each support bar 23, the support surfaces of the stay bars 25 can stretch and retract in the propping process according to the condition of the inner wall of each drill hole 7, the elastic sealing pads 27 are tightly attached to each part of the inner wall of each drill hole 7, the sealing performance of the support bars 23 is ensured, air bags 28 are arranged between the two rows of the support bars 23, the sealing area of each elastic sealing pad 27 can be further enlarged, the sealing performance of the support bars is effectively improved, and the pressure monitoring of gas can be carried out after the sealing mechanism 2 is sealed.
The base 21 is fixedly provided with a hydraulic cavity 212, the inner side of the driving ring 22 is provided with a groove 222, a push rod 223 is fixedly arranged in the groove 222, and the push rod 223 can slide along the hydraulic cavity 212 in a sealing way. The hydraulic cavity 212 is communicated with an external hydraulic driving mechanism, the rotating force of the driving ring 22 is driven by hydraulic pressure, and the hydraulic pressure can provide sufficient power for supporting the supporting rod 23, so that the supporting rod 25 and the elastic sealing gasket 27 are tightly attached to the wall of the drilling hole 7.
The retainer mechanism 6 comprises a retainer 61 and a retainer ring 62, the retainer 61 is fixedly arranged on the outer tube 1, the retainer ring 62 is sealed and rotatably arranged on the retainer 61, two first through holes 63 are formed in the retainer 61, the first through holes 63 are respectively communicated with the grouting port and the water injection port, and two second through holes 64 are formed in the retainer ring 62. The second through hole 64 is communicated with the first through hole 63 through the rotation of the baffle ring 62; and the second through-holes 64 communicate with only one first through-hole 63 at a time. The baffle seat 61 is fixedly provided with a sealing cavity 65, the baffle ring 62 is provided with a sliding plate 621, the sliding plate 621 can slide along the sealing cavity 65 in a sealing way, and the sliding plate 621 is connected with the sealing cavity 65 through a second spring. The pressure measuring tube 3 is externally connected with a pressure monitoring mechanism, in this embodiment, the pressure monitoring mechanism is a manometer, and the grouting tube 4 is connected with the mucus tank through a booster pump.
A one-time use process of the dynamic monitoring device for the gas pressure in the mine comprises the following steps:
During implementation, a drilling hole 7 is drilled in a coal seam 8 by using a drilling machine, the outer pipe 1 is extended into the drilling hole 7, the drilling hole at the output end of the outer pipe 1 is blocked by using a blocking mechanism 2 at the output end of the outer pipe 1, the drilling hole 7 is cleaned by filling cleaning water into the drilling hole 7 by using a water injection pipe 5, after the cleaning is finished, the drilling hole 7 at the input end of the outer pipe 1 is blocked by using the blocking mechanism 2 at the input end of the outer pipe 1, an exhaust hole is reserved in the blocking process, then a slurry is injected into a drilling hole space between the two blocking mechanisms 2 by using a grouting pipe 4, a crack in the wall of the drilling hole 7 is blocked, and the blocking mechanism 2 at the input end of the outer pipe 1 is fully supported after the slurry is filled into the space between the two blocking mechanisms 2, so that the blocking mechanism 2 and the slurry are used for rapidly and tightly blocking the drilling hole 7, and the gas is monitored in real time, so that rapid blocking and rapid monitoring are realized, and after monitoring is finished, the outer pipe 1 can be taken out for recycling, and resource waste is effectively avoided.
In the implementation, in the initial state, the first through hole 63 and the second through hole 64 at the water injection port are in a non-communication state, the first through hole 63 and the second through hole 64 at the slurry injection port are in a communication state, when the water injection pipe 5 is filled with cleaning water, the sliding plate 621 is pushed to slide along the sealing cavity 65 under the action of hydraulic pressure and drives the baffle ring 62 to rotate, so that the water injection port is communicated with the second through hole 64, the baffle ring 62 is used for blocking the first through hole 63 at the slurry injection port, flushing water is effectively prevented from entering the slurry injection pipe 4, further flushing the inside of the drilling hole 7 is performed, after flushing is completed, the sliding plate 621 is reset under the action of the second spring, so that the baffle ring 62 is used for blocking the water injection port, the slurry injection port is in communication with the second through hole 64 again, then the slurry injection pipe 4 is used for filling liquid into a drilling space between the two blocking mechanisms 2, the gap of the inner wall of the drilling hole 7 is further improved, after monitoring, the slurry is used for monitoring, the slurry is prevented from being repeatedly washed out of the drilling hole 7, and the outer pipe is effectively taken out from the outer pipe 11 after flushing is completed.
Claims (2)
1. The utility model provides a gas pressure dynamic monitoring device in mine, its characterized in that includes outer tube, shutoff mechanism and retaining ring mechanism, outer tube input and output all are fixed to be provided with shutoff mechanism, set up piezometer tube, slip casting pipe and water injection pipe in the outer tube, wherein the piezometer tube passes from the outer tube inside, opens slip casting mouth and water injection mouth on the outer tube lateral wall, slip casting pipe and slip casting mouth intercommunication, water injection mouth and water injection pipe intercommunication, retaining ring mechanism cover is on slip casting mouth and water injection mouth, piezometer tube external connection has pressure monitoring mechanism;
The plugging mechanism comprises a base, a driving ring, supporting rods, deflection seats and supporting rods, wherein the base is annular, supporting plates are fixedly arranged on two sides of the base, the driving ring is rotatably arranged between the two supporting plates, a plurality of deflection seats are symmetrically rotatably arranged on the two supporting plates, sixteen to twenty-two pairs of deflection seats are arranged, round holes with the same diameter as the supporting rods are formed in the deflection seats, a plurality of supporting rods are symmetrically hinged on two sides of the driving ring, the number of the supporting rods is equal to that of the deflection seats, the other ends of the supporting rods penetrate through the round holes in the deflection seats at corresponding positions, sliding grooves are formed in the supporting rods, the supporting rods are slidably arranged in the sliding grooves, and the supporting rods are fixedly connected with the sliding groove pieces through springs;
an elastic sealing pad is fixedly arranged between the support plates, an air inflation cavity is fixedly arranged on the driving ring, an air bag is arranged between the air inflation cavity and the elastic sealing pad, and a rotating wheel is rotatably arranged at the front end of the supporting rod;
The base is fixedly provided with a hydraulic cavity, a groove is formed in the inner side of the driving ring, a push rod is fixedly arranged in the groove, and the push rod can slide along the hydraulic cavity in a sealing manner;
the retaining ring mechanism comprises a retaining seat and a retaining ring, the retaining seat is fixedly arranged on the outer tube, the retaining ring is sealed and rotatably arranged on the retaining seat, two first through holes are formed in the retaining seat and are respectively communicated with the grouting opening and the water injection opening, and two second through holes are formed in the retaining ring;
The second through hole is communicated with the first through hole through the rotation of the baffle ring; and the second through hole is communicated with only one first through hole at a time;
the sealing device is characterized in that a sealing cavity is fixedly arranged on the baffle seat, a sliding plate is arranged on the baffle ring, the sliding plate can slide along the sealing cavity in a sealing mode, and the sliding plate is connected with the sealing cavity through a second spring.
2. The dynamic monitoring device for gas pressure in a mine as claimed in claim 1, wherein the grouting pipe is connected with the mucus tank through a booster pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410012830.XA CN117569796B (en) | 2024-01-04 | 2024-01-04 | Dynamic monitoring device for gas pressure in mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410012830.XA CN117569796B (en) | 2024-01-04 | 2024-01-04 | Dynamic monitoring device for gas pressure in mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117569796A CN117569796A (en) | 2024-02-20 |
| CN117569796B true CN117569796B (en) | 2024-07-09 |
Family
ID=89894132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410012830.XA Active CN117569796B (en) | 2024-01-04 | 2024-01-04 | Dynamic monitoring device for gas pressure in mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117569796B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963150A (en) * | 2020-08-27 | 2020-11-20 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN114575828A (en) * | 2022-03-18 | 2022-06-03 | 平顶山天安煤业股份有限公司 | Remote deep hole coal seam gas pressure measuring device and using method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1443030A (en) * | 1973-11-02 | 1976-07-21 | Coal Industry Patents Ltd | Sealing a tube in a bore |
| US7650939B2 (en) * | 2007-05-20 | 2010-01-26 | Pioneer Energy, Inc. | Portable and modular system for extracting petroleum and generating power |
| CN107476822B (en) * | 2017-10-12 | 2019-04-16 | 中国矿业大学 | Coal Seam Outburst Hazard measuring while drilling method and device |
| CN107448188B (en) * | 2017-10-12 | 2020-06-12 | 中国矿业大学 | Coal bed gas parameter while-drilling test method and device |
| CN114526060A (en) * | 2022-02-14 | 2022-05-24 | 中煤科工集团重庆研究院有限公司 | Device and method for measuring gas pressure in downhole directional long-drill hole bottom space while drilling |
| CN115949392A (en) * | 2023-01-05 | 2023-04-11 | 中煤科工集团沈阳研究院有限公司 | Active measuring device and method for gas pressure of downward drilling coal seam |
-
2024
- 2024-01-04 CN CN202410012830.XA patent/CN117569796B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963150A (en) * | 2020-08-27 | 2020-11-20 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN114575828A (en) * | 2022-03-18 | 2022-06-03 | 平顶山天安煤业股份有限公司 | Remote deep hole coal seam gas pressure measuring device and using method |
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| Publication number | Publication date |
|---|---|
| CN117569796A (en) | 2024-02-20 |
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