CN219265746U - Coal core sampler for treating coal mine gas - Google Patents
Coal core sampler for treating coal mine gas Download PDFInfo
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- CN219265746U CN219265746U CN202320081067.7U CN202320081067U CN219265746U CN 219265746 U CN219265746 U CN 219265746U CN 202320081067 U CN202320081067 U CN 202320081067U CN 219265746 U CN219265746 U CN 219265746U
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Abstract
The utility model discloses a coal core sampler for treating coal mine gas, which comprises a coring outer barrel, a coring end cover, a coring bit and a coring inner barrel, wherein the coring end cover and the coring bit are respectively arranged at two ends of the coring outer barrel, and the coring inner barrel is arranged in an inner cavity of the outer barrel of the coring outer barrel; the coring inner cylinder is assembled and fixed with one end of the telescopic pipe, the other end of the telescopic pipe is assembled and fixed with the valve body of the ball valve, and the telescopic pipe has telescopic elasticity; the ball valve also comprises a ball body, a valve rod and a gear, wherein the ball body is arranged in the valve body, is sealed with the valve body and can be assembled in a rotating way, and is provided with a through ball body channel; the two valve rods are respectively arranged at two sides of the sphere, and one ends of the two valve rods, which are far away from the sphere, penetrate out of the valve body and are respectively assembled with the two gears; the gear can be meshed with the rack, and the rack is arranged in the vertical groove of the inner cavity of the outer cylinder. The utility model can realize the whole section sampling of the coal core, and can seal the space where the coal core is located after the sampling is finished so as to realize the sealed sampling.
Description
Technical Field
The utility model relates to a coal core sampler, in particular to a coal core sampler for treating coal mine gas.
Background
In the coal mining process, prevention of gas outburst is a key point to be considered. At present, a sampler is generally adopted for punching and sampling, then the gas content in the coal seam is converted through the sample, and then a mining plan is designed by taking the gas content as a reference. Most of the current samplers crush and take out the sample, and then combine error compensation to convert the gas content, and obviously, the error of the mode is larger and the precision is low. In addition, the performance of coal and rock, such as impact resistance, compressive strength and the like, is considered in the mining process to provide references for subsequent roadway support, but at present, a crushing and sampling mode is adopted, so that corresponding performance tests cannot be carried out on samples, and most of the samples are based on the performance impulse reference test of peripheral coal and rock, and obviously, certain errors and even accidents are easy to cause.
Based on the above problems, how to develop a segmented and sealed coring mode is a technical problem to be solved at present, the segmented and sealed coring mode is used for measuring the gas content of the coal bed accurately, and the segmented coal core can be used for subsequent performance tests, such as a compressive strength test, a Hopkinson bar test and the like.
Disclosure of Invention
The utility model aims at the problems and overcomes the defects of the prior art, and provides a coal core sampler for treating coal mine gas, which can segment coal and rock and carry out sealed coring.
In order to achieve the above purpose, the present utility model adopts the following technical scheme.
The utility model provides a coal core sampler for treating coal mine gas, which comprises a coring outer barrel, a coring end cover, a coring bit and a coring inner barrel, wherein the coring end cover and the coring bit are respectively arranged at two ends of the coring outer barrel, and the coring inner barrel is arranged in an inner cavity of the outer barrel of the coring outer barrel;
the coring inner cylinder is assembled and fixed with one end of the telescopic pipe, the other end of the telescopic pipe is assembled and fixed with the valve body of the ball valve, and the telescopic pipe has telescopic elasticity; the ball valve also comprises a ball body, a valve rod and a gear, wherein the ball body is arranged in the valve body, is sealed with the valve body and can be assembled in a rotating way, and is provided with a through ball body channel; the two valve rods are respectively arranged at two sides of the sphere, and one ends of the two valve rods, which are far away from the sphere, penetrate out of the valve body and are respectively assembled with the two gears; the gear can be meshed with the rack, and the rack is arranged in the vertical groove of the inner cavity of the outer cylinder.
As a further improvement of the utility model, the coring end cover is used for being connected with a drill rod, a hollow drill rod cavity is arranged in the drill rod, and the drill rod cavity can be connected with high-pressure water flow.
As a further improvement of the utility model, the inner part of the coring inner cylinder is a hollow inner cylinder cavity, and an inner cylinder sliding block is arranged on the outer wall of the coring inner cylinder; the coring device comprises a coring inner barrel, a coring inner barrel and a drilling rod cavity, wherein a diversion cavity is arranged at one end of the coring inner barrel, which is far away from the opening end of the inner barrel cavity, the diversion cavity is communicated with a second joint, the second joint is communicated with the first joint through an explosion-proof hose, and the first joint is communicated with the drilling rod cavity;
an elastic sleeve is arranged in the inner cylinder cavity, an end ring is arranged at one end of the elastic sleeve, the end ring is assembled and fixed with one end of the coring inner cylinder, which is provided with a diversion cavity, and the elastic sleeve is elastic and is in a contracted state in an initial state; the elastic sleeve is hollow and is communicated with the flow guiding cavity.
As a further improvement of the utility model, a one-way valve is arranged between the second joint and the diversion cavity, and the flow direction of the one-way valve is the flow in the diversion cavity; the one-way valve comprises a first valve casing and a second valve casing, valve cores are arranged in the first valve casing and the second valve casing, a valve core spring is arranged between the valve cores and the second valve casing, and the valve core spring applies thrust to the valve cores far away from the second valve casing; the valve core and the first valve shell are mutually bonded and sealed through a valve core sealing surface and a valve shell sealing surface, and the valve core sealing surface and the valve shell sealing surface are respectively arranged on the valve core and the first valve shell.
As a further improvement of the utility model, the elastic sleeve is also provided with a switch part which is arranged in an inner barrel chute, and the inner barrel chute is arranged on the side wall of the coring inner barrel and penetrates through the coring inner barrel; the inner barrel chute is also clamped and assembled in a sliding way with the switch slide block, and one end of the switch slide block is fixedly assembled with the switch part;
the other end of switch slider compresses tightly with the one end of buckle board, is provided with the buckle arch on the other end of buckle board, and buckle protruding card is packed into the buckle inslot, and the buckle inslot sets up on the inner wall in perpendicular groove, be provided with the buckle axial plate on the mid portion of buckle board, be provided with the axle hole on the buckle axial plate, the axle hole suit is outside the pivot, and the pivot is installed on the articulated slab, and the articulated slab is installed on the outer wall of coring inner tube.
As a further improvement of the utility model, one end of the buckle plate provided with the buckle bulge is tightly pressed with one side of the U-shaped spring, and the other side of the U-shaped spring is arranged on the outer wall of the coring inner cylinder; the U-shaped spring has elasticity, and it is provided with the bellied one end of buckle to the buckle board and applys to buckle groove pivoted elasticity.
As a further improvement of the utility model, the diameter of the spindle is smaller than the diameter of the spindle hole.
As a further improvement of the utility model, one end of the coring inner cylinder provided with the diversion cavity is assembled with one end of the tension spring, and the other end of the tension spring is assembled with the coring end cover; in the initial state, the tension spring is in a stretched state.
The beneficial effects of the utility model are as follows:
the utility model can realize the whole section sampling of the coal core, and can seal the space where the coal core is located after the sampling is finished so as to realize the sealed sampling. Therefore, the gas content in the coal layer can be relatively accurately obtained by detecting the gas content in the space where the coal core is located and combining the gas content in the coal core in the subsequent test, and a reference is provided for subsequent gas control. In addition, the whole section of coal core can obtain the parameters such as strength, strain and the like through corresponding tests so as to provide references for subsequent support and gas control.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
FIG. 2 is a cross-sectional view of the coring barrel at the center plane of the axis.
Fig. 3 is an enlarged view at a in fig. 2.
FIG. 4 is a partial cross-sectional view of the coring barrel at the vertical slot.
FIG. 5 is a schematic view of the structure of the coring inner barrel, the telescoping tube and the ball valve.
FIG. 6 is a schematic view of the ball valve and the telescopic pipe.
The marks in the figure: 110 is a coring outer cylinder, 111 is an inner cavity of the outer cylinder, 112 is a vertical groove, 113 is a buckling groove; 120 is the coring bit, 121 is the bit hole, 130 is the coring end cap, 140 is the coring inner barrel, 141 is the inner barrel cavity, 142 is the guide cavity, 143 is the inner barrel slider, 144 is the hinged plate, 145 is the inner barrel chute, 200 is the drill pipe, 201 is the drill pipe cavity, 311 is the first joint, 312 is the second joint, 320 is the explosion proof hose, 410 is the tension spring, 510 is the valve body, 520 is the ball, 521 is the ball channel, 530 is the valve rod, 540 is the gear, 550 is the rack, 560 is the telescopic pipe, 561 is the connecting flange, 610 is the elastic sleeve, 611 is the switch part, 612 is the end ring, 620 is the switch slider, 630 is the snap-in plate, 631 is the snap-in protrusion, 632 is the snap-in plate, 633 is the shaft hole, 640 is the rotary shaft, 650 is the U-shaped spring, 710 is the first valve housing, 711 is the valve housing sealing surface, 720 is the second valve housing, 730 is the valve core 731, the valve core sealing surface, and 740 is the valve core spring.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Referring to fig. 1-6, the coal core sampler of the present embodiment includes a core outer barrel 110, a core end cap 130, a core bit 120, and a core inner barrel 140, wherein the core end cap 130 and the core bit 120 are respectively installed at two ends of the core outer barrel 110, the core inner barrel 140 is installed in an outer barrel inner cavity 111 of the core outer barrel 110, and a vertical groove 112 is provided on an inner wall of the outer barrel inner cavity 111. The coring end cap 130 is used for connecting with the drill rod 200, the inside of the drill rod 200 is a hollow drill rod cavity 201, and the drill rod cavity 201 can be connected with high-pressure water flow in use.
The inside of coring inner tube 140 is hollow inner tube chamber 141, is provided with inner tube slider 143, hinge plate 144 on the outer wall of coring inner tube 140 respectively, coring inner tube 140 is provided with water conservancy diversion chamber 142 on keeping away from the one end in inner tube chamber 141 open end, water conservancy diversion chamber 142 and second joint 312 intercommunication, installs the check valve between second joint 312 and the water conservancy diversion chamber 142, and the check valve includes first valve casing 710, second valve casing 720, install case 730 in first valve casing 710, the second valve casing 720, install case spring 740 between case 730 and the second valve casing 720, case spring 740 applys the thrust of keeping away from second valve casing 720 to case 730. The valve core 730 and the first valve housing 710 are mutually attached and tightly pressed by the valve core sealing surface 731 and the valve housing sealing surface 711. The valve element sealing surface 731 and the valve housing sealing surface 711 are provided on the valve element 730 and the first valve housing 710, respectively. In use, the valve core 730 is opened by pressure of the high pressure water, and then the high pressure water flow is input into the diversion chamber 142.
An elastic sleeve 610 is installed in the inner cylinder cavity 141, an end ring 612 is installed on one end of the elastic sleeve 610, the end ring 612 is assembled and fixed with one end of the coring inner cylinder 140 where the diversion cavity 142 is provided, and the elastic sleeve 610 has high elasticity and is in a contracted state in an initial state. The inside of the elastic sleeve 610 is hollow and the inside of the elastic sleeve 610 is communicated with the diversion cavity 142, so that high-pressure water in the diversion cavity 142 can be introduced into the elastic sleeve 610, and the high-pressure water enables the elastic sleeve 610 to expand to clamp the coal core.
The elastic sleeve 610 is further provided with a switch portion 611, the switch portion 611 is installed in the inner barrel chute 145, and the inner barrel chute 145 is disposed on a side wall of the coring inner barrel 140 and penetrates the coring inner barrel 140. The inner cylinder chute 145 is also engaged with and slidably mounted on the switch slider 620, and one end of the switch slider 620 is fixedly mounted on the switch portion 611. The other end of the switch slider 620 is tightly pressed with one end of the buckling plate 630, the buckling protrusion 631 is arranged at the other end of the buckling plate 630, the buckling protrusion 631 is clamped into the buckling groove 113, the buckling groove 113 is arranged on the inner wall of the vertical groove 112, the buckling shaft plate 632 is arranged on the middle part of the buckling plate 630, the shaft plate hole 633 is arranged on the buckling shaft plate 632, the shaft plate hole 633 is sleeved outside the shaft 640, the shaft 640 is arranged on the hinge plate 144, and the hinge plate 144 is arranged on the outer wall of the coring inner barrel 140. And the diameter of the rotating shaft 640 is smaller than that of the shaft hole 633, so that the design mainly enables the locking protrusion 631 to have a certain downward displacement when rotating away from the locking groove 113, thereby avoiding locking and enabling the locking protrusion 631 to smoothly rotate out of the locking groove 113.
The end of the locking plate 630 provided with the locking protrusion 631 is pressed against one side of the U-shaped spring 650, the other side of the U-shaped spring 650 is mounted on the outer wall of the coring inner cylinder 140, and the U-shaped spring 650 has elasticity, which applies elasticity to the end of the locking plate 630 provided with the locking protrusion 631 rotating toward the locking groove 113, so that the locking protrusion 631 is kept to be assembled with the locking groove 113.
The second connector 312 is communicated with the first connector 311 through the explosion-proof hose 320, and the first connector 311 is communicated with the drill rod cavity 201, so that high-pressure water in the drill rod cavity 201 can be introduced into the second connector 312. The end of the coring inner cylinder 140 provided with the flow guiding cavity 142 is assembled with one end of the tension spring 410, the other end of the tension spring 410 is assembled with the coring end cap 130, and in the initial state (state of fig. 2), the tension spring 410 is in the stretched state, but at this time, the coring inner cylinder 140 is not moved and the tension spring is kept in the stretched state because the locking protrusion 631 is locked in the locking groove 113. Once the high-pressure water enters the elastic sleeve 610, the switch portion 611 expands and stretches, so that the switch slider 620 is driven to move away from the elastic sleeve 610, the switch slider 620 pushes the latch plate 630 to rotate with the rotating shaft 640 as a center, so that the latch protrusion 631 rotates out of the latch groove 113, at this time, the tension spring 410 drives the coring inner barrel 140 to move towards the coring end cover 130, and the elastic sleeve 610 clamps the coal core, so that the broken coal core can be driven to move towards the coring end cover 130 together.
The coring inner cylinder 140 is assembled and fixed with a connecting flange 561 at one end of a telescopic tube 560, the connecting flange 561 at the other end of the telescopic tube 560 is assembled and fixed with a valve body 510 of a ball valve, and the telescopic tube 560 has telescopic elasticity.
The ball valve also comprises a ball 520, a valve rod 530 and a gear 540, wherein the ball 520 is arranged in the valve body 510, is sealed and can be rotatably assembled with the valve body 510, and a ball channel 521 penetrating through the ball 520 is arranged; the two valve rods 530 are respectively arranged at two sides of the sphere 520, and one ends of the two valve rods 530 far away from the sphere 520 penetrate out of the valve body 510 and are respectively assembled with the two gears 540; the gear 540 can be engaged with the rack 550, the rack 550 is installed in the vertical groove 112, and the gear 540 is close to or pressed against the portion of the rack 550 where the latch is provided in the initial state. Referring to fig. 2, when the tension spring 410 drives the coring inner cylinder 140 to move upwards, the extension tube 560 is pulled to extend, and after the extension tube 560 is extended in place, the ball valve is driven to move upwards, so that the gear 540 is meshed with the rack 550, and the gear 540, the valve rod 530 and the ball 520 are driven to rotate 90 degrees, so that the ball channel 521 is closed. At this time, the sampled coal core is sealed in the coring inner cylinder 140 and the telescopic pipe 560 by the ball valve, so as to realize sealed sampling.
In this embodiment, a damping slider may be disposed on the valve body 510, where the damping slider is assembled with the vertical slot 112 in a manner of being engaged with and sliding, but has a certain damping. This allows the pulling force after extension tube 560 is straightened to pull valve body 510 to move, thereby preventing valve body 510 from moving as extension tube 560 is elongated. This design does not consume much power from the tension spring 410 because the amount of displacement of the entire ball valve is short. Also in this embodiment, rack 550 cannot drive ball 520 until ball channel 521 rotates 180, preferably only ball 520 rotates between 90 and 130, and then gear 540 is disengaged from the teeth on rack 550. This design is primarily intended to avoid excessive rotation of gear 540 causing re-opening of ball passage 521.
During sampling, the coring end cap 130 is mounted on the drill rod 200 and then is loaded into the coring hole until the coring position is reached, and then the drill rod 200 is rotated, so that the coring bit 120 rotates to drill the coal core, the coal core passes through the bit hole 121, the sphere channel 521 and the telescopic pipe 560 and then enters the inner cylinder cavity 141 until the inner cylinder cavity 141 is filled, and then the coal core is broken under the driving of the drill rod 200. High-pressure water flow is input into the drill rod cavity 201, the high-pressure water flow enters the guide cavity 142 and then enters the elastic sleeve 610, so that the elastic sleeve 610 expands to clamp a coal core, the switch sliding block 620 is driven to extend, the switch sliding block 620 drives the buckling protrusion 631 to rotate out of the buckling groove 113, at the moment, the tension spring drives the coring inner cylinder 140 to move towards the direction of the drill rod 200, the water pressure in the drill rod cavity 201 is reduced, the explosion-proof hose 320 is softened, the tension spring 410 drives the coring inner cylinder 140 to move to the maximum displacement, in the process, the broken end of the coal core is pulled through the ball channel 521 and pulled into the telescopic tube 560, then the ball valve is pulled to move, and the gear 540 on the ball valve is meshed with the rack 550 to drive the ball 520 to rotate to close the ball channel 521, so that the coal core is sealed. The drill rod 200 is taken out, the whole coal core sampler is dismounted, then the coring end cover 130 is dismounted, the coring inner cylinder 140, the telescopic pipe 560 and the ball valve are pulled out of the coring outer cylinder 110, and the valve core 730 is pressed to discharge high-pressure water in the elastic sleeve 610, so that the coal core can be taken out. When the telescopic tube 560 is taken out, the joint of the telescopic tube 560 and the coring inner barrel 140 is disassembled, the telescopic tube 560 and the ball valve are taken down, and at the moment, the coal core is exposed and can be directly pulled out. If the gas content in the sampler is detected before the coal core is taken out, a pipeline can be connected to the ball valve, the ball valve is opened, and the gas in the coring inner cylinder 140 and the telescopic pipe 560 can be extracted.
The present utility model is not described in detail in the present application, and is well known to those skilled in the art.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. A coal core sampler for administering colliery gas, its characterized in that: the device comprises a coring outer barrel, a coring end cover, a coring bit and a coring inner barrel, wherein the coring end cover and the coring bit are respectively arranged at two ends of the coring outer barrel, and the coring inner barrel is arranged in an inner cavity of the outer barrel of the coring outer barrel;
the coring inner cylinder is assembled and fixed with one end of the telescopic pipe, the other end of the telescopic pipe is assembled and fixed with the valve body of the ball valve, and the telescopic pipe has telescopic elasticity; the ball valve also comprises a ball body, a valve rod and a gear, wherein the ball body is arranged in the valve body, is sealed with the valve body and can be assembled in a rotating way, and is provided with a through ball body channel; the two valve rods are respectively arranged at two sides of the sphere, and one ends of the two valve rods, which are far away from the sphere, penetrate out of the valve body and are respectively assembled with the two gears; the gear can be meshed with the rack, and the rack is arranged in the vertical groove of the inner cavity of the outer cylinder.
2. A coal core sampler for use in treating coal mine gas as claimed in claim 1, wherein: the coring end cover is used for being connected with a drill rod, a hollow drill rod cavity is formed in the drill rod, and the drill rod cavity can be connected with high-pressure water flow.
3. A coal core sampler for use in treating coal mine gas as claimed in claim 1, wherein: the inner wall of the coring inner barrel is provided with a hollow inner barrel cavity, and the outer wall of the coring inner barrel is provided with an inner barrel sliding block; the coring inner barrel is provided with a diversion cavity at one end far away from the opening end of the inner barrel cavity, the diversion cavity is communicated with a second joint, the second joint is communicated with a first joint through an explosion-proof hose, and the first joint is communicated with a drill rod cavity;
an elastic sleeve is arranged in the inner cylinder cavity, an end ring is arranged at one end of the elastic sleeve, the end ring is assembled and fixed with one end of the coring inner cylinder, which is provided with a diversion cavity, and the elastic sleeve is elastic and is in a contracted state in an initial state; the elastic sleeve is hollow and is communicated with the flow guiding cavity.
4. A coal core sampler for use in treating coal mine gas as claimed in claim 3 wherein: a one-way valve is arranged between the second joint and the diversion cavity, and the flow direction of the one-way valve is the flow in the diversion cavity; the one-way valve comprises a first valve casing and a second valve casing, valve cores are arranged in the first valve casing and the second valve casing, a valve core spring is arranged between the valve cores and the second valve casing, and the valve core spring applies thrust to the valve cores far away from the second valve casing; the valve core and the first valve shell are mutually bonded and sealed through a valve core sealing surface and a valve shell sealing surface, and the valve core sealing surface and the valve shell sealing surface are respectively arranged on the valve core and the first valve shell.
5. A coal core sampler for use in treating coal mine gas as claimed in claim 3 wherein: the elastic sleeve is also provided with a switch part which is arranged in an inner barrel chute, and the inner barrel chute is arranged on the side wall of the coring inner barrel and penetrates through the coring inner barrel; the inner barrel chute is also clamped and assembled in a sliding way with the switch slide block, and one end of the switch slide block is fixedly assembled with the switch part;
the other end of switch slider compresses tightly with the one end of buckle plate, is provided with the buckle arch on the other end of buckle plate, and buckle protruding card is packed into the buckle inslot, and the buckle inslot sets up on the inner wall in perpendicular groove, be provided with the buckle axial plate on the mid portion of buckle plate, be provided with the axle hole on the buckle axial plate, the axle hole suit is outside the pivot, and the pivot is installed on the hinged plate, and the hinged plate is installed on the outer wall of coring inner tube.
6. A coal core sampler for use in treating coal mine gas as claimed in claim 5, wherein: one end of the buckling plate, provided with the buckling bulge, is tightly pressed with one side of the U-shaped spring, and the other side of the U-shaped spring is arranged on the outer wall of the coring inner barrel; the U-shaped spring has elasticity, and it is provided with the bellied one end of buckle to the buckle board and applys to buckle groove pivoted elasticity.
7. A coal core sampler for use in treating coal mine gas as claimed in claim 5, wherein: the diameter of the rotating shaft is smaller than that of the shaft hole.
8. A coal core sampler for use in treating coal mine gas as claimed in claim 3 wherein: one end of the coring inner cylinder, which is provided with a flow guide cavity, is assembled with one end of a tension spring, and the other end of the tension spring is assembled with a coring end cover; in the initial state, the tension spring is in a stretched state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320081067.7U CN219265746U (en) | 2023-01-13 | 2023-01-13 | Coal core sampler for treating coal mine gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320081067.7U CN219265746U (en) | 2023-01-13 | 2023-01-13 | Coal core sampler for treating coal mine gas |
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| CN219265746U true CN219265746U (en) | 2023-06-27 |
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| CN202320081067.7U Active CN219265746U (en) | 2023-01-13 | 2023-01-13 | Coal core sampler for treating coal mine gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117072095A (en) * | 2023-10-18 | 2023-11-17 | 山东省煤田地质局第一勘探队 | Coring while drilling device and method for coal bed gas content measurement |
-
2023
- 2023-01-13 CN CN202320081067.7U patent/CN219265746U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117072095A (en) * | 2023-10-18 | 2023-11-17 | 山东省煤田地质局第一勘探队 | Coring while drilling device and method for coal bed gas content measurement |
| CN117072095B (en) * | 2023-10-18 | 2024-05-17 | 山东省煤田地质局第一勘探队 | Coring while drilling device and method for coal bed gas content measurement |
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