Deep coal seam pressure-maintaining coring gas content testing device and deep coal seam pressure-maintaining coring gas content testing method

Abstract

The invention discloses a deep coal seam pressure-maintaining coring gas content testing device and method.The deep coal seam pressure-maintaining coring gas content testing device comprises a support, a sliding rail is arranged in the support, a first sliding plate is arranged in the sliding rail in a sliding mode, and a sampling barrel is rotationally arranged below the first sliding plate; the upper end of the sampling barrel penetrates through the first sliding plate, a second sliding plate is further arranged in the sliding rail above the first sliding plate in a sliding mode, a transmission screw is rotationally arranged below the second sliding plate, and the transmission screw is rotationally arranged in the sampling barrel; and a third sliding plate is further arranged in the sliding rail above the second sliding plate in a sliding mode, a grouting pipe is rotationally arranged below the third sliding plate, and the grouting pipe penetrates through the transmission screw rod in a sliding mode. Compared with the prior art, the device has the beneficial effects of being accurate in sampling, efficient in grouting, flexible in adjustment, convenient to operate, high in adaptability and high in reliability.

Description

Technical Field

[0001] The invention relates to the technical field of coal seam sampling devices, in particular to a deep coal seam pressure-maintaining coring gas content testing device and method. Background Art

[0002] In the field of coal resource exploration and development, the gas content test of deep coal seams is a key link in evaluating the potential of coalbed methane resources and the value of mining. The deep coal seam pressure-maintained core sampling gas content test technology aims to accurately obtain samples deep in the coal seam and maintain its original pressure state to accurately determine the gas content in the coal seam, providing a scientific basis for the development and utilization of coalbed methane resources. The gas content of deep coal seams directly reflects the occurrence state and mining potential of gas in the coal seams. Accurate gas content test data helps geologists understand the gas storage performance and mining conditions of coal seams, and provides an important basis for the exploration, development and production planning of coalbed methane fields. At the same time, it is also of vital importance to evaluate the economic value of coalbed methane resources, formulate reasonable development strategies, and ensure safe production in coal mines.

[0003] At present, the gas content test of deep coal seam pressure coring is mainly carried out by sampling tubes. The sampling tube is drilled into the deep coal seam by drilling equipment, and the coal seam sample is obtained by using the sampling mechanism inside the sampling tube. During the sampling process, the sampling tube needs to maintain a certain degree of sealing to prevent gas leakage in the sample. After the sampling is completed, the sampling tube is lifted to the ground and the gas content test is carried out through a specific device.

[0004] When drilling coal seam samples, the sampling tubes of the prior art often cannot accurately control the sampling depth, resulting in the distribution of samples in the sampling tube from the surface to the deep layer of the coal seam. However, surface samples are often affected by factors such as the surface environment and weathering, and their gas content and composition are significantly different from those of deep coal seams. Therefore, surface samples have no practical significance for testing the gas content of deep coal seams, but will increase the load of the sampling equipment and the complexity of subsequent processing. During the sampling process, the upper and lower ends of the sampling tube need to maintain a certain degree of sealing to prevent gas leakage in the sample. However, due to factors such as vibration, friction and changes in formation pressure during the drilling process, the upper and lower ends of the sampling tube are often not tightly sealed. Once the seal fails, the gas in the sample will leak out, resulting in inaccurate test results or even failure to test. This will not only affect the reliability of the test results, but also waste a lot of time and resources.

[0005] Therefore, it is necessary to provide a deep coal seam pressure-maintaining coring gas content testing device and method to solve the problems raised in the above background technology. Summary of the invention

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a deep coal seam pressure-maintaining coring gas content testing device, comprising a bracket, a slide rail is arranged in the bracket, a first slide plate is slidably arranged in the slide rail, a sampling barrel is rotatably arranged under the first slide plate, the upper end of the sampling barrel passes through the first slide plate, a second slide plate is also slidably arranged in the slide rail above the first slide plate, a transmission screw is rotatably arranged under the second slide plate, and the transmission screw is rotatably arranged in the sampling barrel;

[0007] A third slide is slidably arranged in the slide rail above the second slide, and a grouting pipe is rotatably arranged under the third slide. The grouting pipe slidably passes through the transmission screw, and the lower end of the grouting pipe extends to a certain distance above the lower end of the sampling tube.

[0008] Furthermore, the third slide plate is provided with a grouting hole which penetrates to the grouting pipe.

[0009] Furthermore, a guide screw is rotatably connected between the first slide plate and the third slide plate, and the guide screw is threadedly connected to the second slide plate;

[0010] The third slide plate is provided with a driving motor connected to the lead screw.

[0011] Furthermore, a pull rope is fixed in the third slide plate, and the pull rope is passed around the top of the slide rail and is wound in a winch located in the bracket.

[0012] Furthermore, a hydraulic cylinder is hinged between the slide rail and the bracket.

[0013] Furthermore, a square shaft is rotatably arranged in the slide rail, and the square shaft is connected to a square shaft motor located in the bracket;

[0014] A first driving gear is rotatably disposed under the first slide plate, and the first driving gear is slidably connected to the square shaft;

[0015] A gear ring is fixed on the upper end of the sampling cylinder, and the gear ring is meshed with the first driving gear.

[0016] Furthermore, a second driving gear is rotatably provided on the second slide plate, and the second driving gear is slidably connected to the square shaft;

[0017] The second slide plate is also rotatably provided with a transmission gear, and the transmission gear is meshed with the second driving gear;

[0018] A screw gear is also rotatably arranged on the second slide plate, the screw gear is meshed with the transmission gear, and the screw gear is fixed to the transmission screw.

[0019] Furthermore, a drill bit is fixed at the bottom of the grouting pipe, grouting holes are distributed around the drill bit, and the grouting pipe is connected to the transmission screw in a slidable and rotationally restricted manner.

[0020] Furthermore, the blades are circumferentially distributed around the lower end of the transmission screw, one side of the blade is a blade, a rotating shaft is fixed at the center of the blade, the rotating shaft is rotatably connected to the side wall of the transmission screw, and when two adjacent blades are rotated to fit each other, the blades face downward;

[0021] The side wall of the transmission screw is provided with a limit block corresponding to the position of each blade;

[0022] A torsion spring is arranged between the rotating shaft and the transmission screw, and the elastic force of the torsion spring causes the blades to rotate in a direction of being in contact with each other.

[0023] A sampling method for a deep coal seam pressure-maintaining coring gas content testing device, comprising:

[0024] S1. Start the square shaft motor to drive the square shaft to rotate, thereby driving the sampling tube and the transmission screw to rotate. By controlling the winch, adjust the height of the sampling tube so that it gradually contacts and drills into the coal seam;

[0025] S2. When the sampling barrel is drilled into the coal seam, the grouting pipe is drilled synchronously, and the transmission screw rotates synchronously. The blades cut the coal seam samples during the rotation, and the samples are transported upward and discharged through the gaps between the blades. The position of the second slide is changed by the driving motor, thereby adjusting the depth of the transmission screw extending into the sampling barrel to obtain the sample of the required length;

[0026] S3, inject grout into the grouting pipe through the grouting hole, so that the grout seals the lower end of the sampling tube; after the grouting is completed, wait for the grout to solidify to ensure that the lower end of the sampling tube is airtight to prevent the sample from leaking from the bottom;

[0027] S4. Start the winch and lift the sampling tube to separate the sampling tube and the transmission screw from the coal seam. Adjust the slide rail to a horizontal state through the hydraulic cylinder, take out the sample in the sampling tube and conduct testing.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the present invention, the device can accurately obtain samples of deep coal seams through deep drilling of the sampling tube, combined with the rotary cutting and conveying functions of the transmission screw, while avoiding interference of surface soil on the test results. The blade design at the lower end of the transmission screw can not only cut coal seam samples during rotation, but also automatically close when the reaction force of the coal seam surface is lost to form a closed space, ensuring that the top of the obtained sample can be closed, realizing pressure-maintained coring, and providing accurate and complete samples for subsequent gas content testing.

[0030] In the present invention, the design of the grouting pipe enables the slurry to accurately block the lower end of the sampling tube, effectively preventing the sample from leaking from the bottom during the extraction process, and ensuring the airtightness of the lower end of the sampling tube. The slidable and rotation-restricted connection between the grouting pipe and the transmission screw, as well as the drill bit design at the bottom of the grouting pipe, enable the grouting pipe to drill smoothly into the coal seam, achieving accurate and efficient grouting and blocking.

[0031] In the present invention, the device realizes flexible adjustment of the height, depth and angle of the sampling barrel, transmission screw and grouting pipe through the design of the slide rail, slide plate, guide screw and other structures, and can accurately position according to the characteristics of different coal seams and sampling requirements. The telescopic function of the hydraulic cylinder enables the slide rail to freely switch between vertical and horizontal states, which is convenient for sample removal and device maintenance after sampling. The coordinated work of power components such as the square shaft motor, drive motor, and winch enables the entire sampling process to be automated and controlled, improving work efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a deep coal seam pressure-maintaining coring gas content testing device;

[0033] Figure 2 It is a schematic diagram of the structure of the first slide plate, the second slide plate and the third slide plate;

[0034] Figure 3 It is a structural schematic diagram of the cross section of the sampling tube;

[0035] Figure 4 It is a structural schematic diagram of the lower end of the transmission screw;

[0036] Figure 5 is a schematic cross-sectional view of the lower end of the transmission screw;

[0037] In the figure: 1. bracket; 2. slide rail; 3. first slide plate; 31. first drive gear; 32. gear ring; 4. sampling tube; 5. second slide plate; 51. second drive gear; 52. transmission gear; 53. screw gear; 6. transmission screw; 61. blade; 62. rotating shaft; 63. limit block; 64. torsion spring; 7. third slide plate; 71. grouting hole; 72. drive motor; 8. grouting pipe; 81. drill bit; 9. guide screw; 10. square shaft; 11. pull rope; 12. winch; 13. hydraulic cylinder; 14. square shaft motor. DETAILED DESCRIPTION

[0038] See also Figure 1-Figure 5In an embodiment of the present invention, a deep coal seam pressure-maintaining coring gas content testing device includes a bracket 1, a slide rail 2 is provided in the bracket 1, a first slide plate 3 is slidably provided in the slide rail 2, a sampling barrel 4 is rotatably provided under the first slide plate 3, and the upper end of the sampling barrel 4 passes through the first slide plate 3, a second slide plate 5 is also slidably provided in the slide rail 2 above the first slide plate 3, a transmission screw 6 is rotatably provided under the second slide plate 5, and the transmission screw 6 is rotatably provided in the sampling barrel 4.

[0039] When the sampling tube 4 is drilled into the coal seam, the soil on the upper part of the sampling tube 4 can be discharged upward through the transmission screw 6, so that the sampling tube 4 only obtains deep samples, which can reduce the load of the equipment during sample coring and reduce the impact of surface soil on the test.

[0040] In this embodiment, a third slide plate 7 is slidably arranged in the slide rail 2 above the second slide plate 5, and a grouting pipe 8 is rotatably arranged under the third slide plate 7. The grouting pipe 8 can slidably penetrate the transmission screw 6, and the lower end of the grouting pipe 8 extends to a certain distance above the lower end of the sampling tube 4.

[0041] In this embodiment, the third slide plate 7 is provided with a grouting hole 71 penetrating to the grouting pipe 8 .

[0042] After the sampling tube 4 is drilled into the coal seam, grout is injected into the grouting pipe 8 through the grouting hole 71, so that the slurry can seal the lower end of the sampling tube 4, so that when the core is extracted from the sampling tube 4, the sample is prevented from leaking from the bottom, and the lower end of the sampling tube 4 can be sealed.

[0043] In this embodiment, a guide screw 9 is rotatably connected between the first slide plate 3 and the third slide plate 7, and the guide screw 9 is threadedly connected to the second slide plate 5;

[0044] The third slide plate 7 is provided with a driving motor 72 connected to the lead screw 9 .

[0045] By driving the guide screw 9 to rotate through the driving motor 72 , the second slide 5 can slide between the first slide 3 and the third slide 7 , thereby changing the depth of the transmission screw 6 extending into the sampling tube 4 to adjust the length of the sample obtained in the sampling tube 4 .

[0046] In this embodiment, a pull rope 11 is fixed in the third slide plate 7 , and the pull rope 11 passes over the top of the slide rail 2 and is rolled up in a winch 12 located in the bracket 1 .

[0047] The height of the third slide plate 7 can be adjusted by controlling the length of the winding rope 11 through the winch 12 , and the heights of the first slide plate 3 and the second slide plate 5 can be adjusted synchronously, thereby changing the heights of the sampling tube 4 and the transmission screw 6 .

[0048] In this embodiment, a hydraulic cylinder 13 is hinged between the slide rail 2 and the bracket 1. The slide rail 2 can be in a vertical or horizontal state by the extension and contraction of the hydraulic cylinder 13. When the slide rail 2 is in a vertical state, the sampling tube 4 drills into the coal seam for sampling. After the sampling tube 4 is completed and lifted, the slide rail 2 is rotated to a horizontal state, which is convenient for obtaining samples.

[0049] In this embodiment, a square shaft 10 is rotatably arranged in the slide rail 2, and the square shaft 10 is connected to a square shaft motor 14 located in the bracket 1;

[0050] A first driving gear 31 is rotatably disposed under the first slide plate 3, and the first driving gear 31 is slidably connected to the square shaft 10;

[0051] A gear ring 32 is fixed to the upper end of the sampling tube 4 , and the gear ring 32 is meshed with the first driving gear 31 .

[0052] That is to say, the square shaft 10 is driven to rotate by the square shaft motor 14, which can drive the sampling barrel 4 to rotate, so that the sampling barrel 4 can drill into the coal seam.

[0053] In this embodiment, a second driving gear 51 is rotatably provided on the second slide plate 5, and the second driving gear 51 is slidably connected to the square shaft 10;

[0054] The second slide plate 5 is also rotatably provided with a transmission gear 52, and the transmission gear 52 is meshed with the second driving gear 51;

[0055] A screw gear 53 is rotatably disposed on the second slide plate 5 . The screw gear 53 is meshed with the transmission gear 52 , and the screw gear 53 is fixed to the transmission screw 6 .

[0056] That is to say, the square shaft 10 is driven to rotate by the square shaft motor 14 to drive the transmission screw 6, so that the transmission screw 6 can discharge the soil in the sampling barrel 4 upward, and because of the transmission through the transmission gear 52, the transmission screw 6 and the sampling barrel 4 rotate in the opposite direction, thereby improving the transmission efficiency.

[0057] In this embodiment, a drill bit 81 is fixed to the bottom of the grouting pipe 8, grouting holes are distributed around the drill bit 81, and the grouting pipe 8 is connected to the transmission screw 6 in a slidable and rotationally restricted manner.

[0058] That is to say, when the transmission screw 6 rotates, it can drive the grouting pipe 8 to rotate, so that the grouting pipe 8 can be drilled smoothly into the coal seam under the action of the drill bit 81.

[0059] The connection method between the grouting pipe 8 and the transmission screw 6 includes but is not limited to a sliding key connection or a spline connection to ensure that the grouting pipe 8 can slide along the transmission screw 6 while limiting the rotation of the grouting pipe 8 relative to the transmission screw 6.

[0060] In this embodiment, blades 61 are distributed circumferentially around the lower end of the transmission screw 6, and one side of the blade 61 is a blade. A rotating shaft 62 is fixed at the center of the blade 61, and the rotating shaft 62 is rotatably connected to the side wall of the transmission screw 6, and when two adjacent blades 61 are rotated to fit each other, the blade edges face downward.

[0061] That is to say, when the transmission screw 6 rotates and the bottom is in contact with the coal seam, the blade edge of the blade 61 will cut the sample and rotate in the vertical direction under the reaction force, thereby increasing the gap between the blades 61, so that the cut sample passes through the gap between the blades 61 and is transported upward and discharged by the transmission screw 6.

[0062] In this embodiment, a limit block 63 is provided on the side wall of the transmission screw 6 at a position corresponding to each blade 61;

[0063] A torsion spring 64 is disposed between the rotating shaft 62 and the transmission screw 6 , and the elastic force of the torsion spring 64 causes the blades 61 to rotate in a direction of being in contact with each other.

[0064] That is to say, under the action of the torsion spring 64, once the transmission screw 6 is no longer in contact with the coal seam surface, the blades 61 lose their reaction force, and adjacent blades 61 are in contact with each other under the action of the torsion spring 64, so that the sampling tube 4 at the lower end of the transmission screw 6 is sealed, so that the top of the sample obtained can be closed, thereby playing the role of maintaining pressure and coring.

[0065] A sampling method for a deep coal seam pressure-maintaining coring gas content testing device, comprising:

[0066] S1, start the square shaft motor 14, drive the square shaft 10 to rotate, and then drive the sampling tube 4 and the transmission screw 6 to rotate, and adjust the height of the sampling tube 4 by controlling the hoist 12, so that it gradually contacts and drills into the coal seam;

[0067] S2. When the sampling barrel 4 is drilled into the coal seam, the grouting pipe 8 is drilled in synchronously, and the transmission screw 6 rotates synchronously. The blades 61 cut the coal seam samples during the rotation, and the samples are transported upward and discharged through the gaps between the blades 61. The position of the second slide 5 is changed by the driving motor 72, thereby adjusting the depth of the transmission screw 6 extending into the sampling barrel 4 to obtain a sample of the required length;

[0068] S3, inject grout into the grouting pipe 8 through the grouting hole 71, so that the slurry blocks the lower end of the sampling tube 4; after the grouting is completed, wait for the slurry to solidify to ensure that the lower end of the sampling tube 4 is airtight to prevent the sample from leaking from the bottom;

[0069] S4, start the hoist 12, lift the sampling tube 4, separate the sampling tube 4 and the transmission screw 6 from the coal seam, adjust the slide rail 2 to a horizontal state through the hydraulic cylinder 13, take out the sample in the sampling tube 4, and conduct a test.

[0070] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A deep coal seam pressure-maintaining coring gas content testing device, characterized in that: The invention comprises a support (1), wherein a slide rail (2) is arranged in the support (1), a first slide plate (3) is slidably arranged in the slide rail (2), a sampling barrel (4) is rotatably arranged under the first slide plate (3), the upper end of the sampling barrel (4) passes through the first slide plate (3), a second slide plate (5) is slidably arranged in the slide rail (2) above the first slide plate (3), a transmission screw (6) is rotatably arranged under the second slide plate (5), and the transmission screw (6) is rotatably arranged in the sampling barrel (4); A third slide plate (7) is slidably disposed in the slide rail (2) above the second slide plate (5), and a grouting pipe (8) is rotatably disposed under the third slide plate (7). The grouting pipe (8) slidably penetrates the transmission screw (6), and the lower end of the grouting pipe (8) extends to a certain distance above the lower end of the sampling tube (4).

2. A deep coal seam pressure-maintaining coring gas content testing device according to claim 1, characterized in that: The third slide plate (7) is provided with a grouting hole (71) that penetrates the grouting pipe (8).

3. A deep coal seam pressure-maintaining coring gas content testing device according to claim 1, characterized in that: A guide screw (9) is rotatably connected between the first slide plate (3) and the third slide plate (7), and the guide screw (9) is threadedly connected to the second slide plate (5); The third slide plate (7) is provided with a driving motor (72) connected to the lead screw (9).

4. A deep coal seam pressure-maintaining coring gas content testing device according to claim 1, characterized in that: A pull rope (11) is fixed in the third slide plate (7), and the pull rope (11) passes around the top of the slide rail (2) and is wound in a winch (12) located in the bracket (1).

5. The deep coal seam pressure-maintaining coring gas content testing device according to claim 1 is characterized in that: A hydraulic cylinder (13) is hingedly connected between the slide rail (2) and the bracket (1).

6. A deep coal seam pressure-maintaining coring gas content testing device according to claim 1, characterized in that: A square shaft (10) is rotatably arranged in the slide rail (2), and the square shaft (10) is connected to a square shaft motor (14) located in the bracket (1); A first driving gear (31) is rotatably disposed under the first slide plate (3), and the first driving gear (31) is slidably connected to the square shaft (10); A gear ring (32) is fixed to the upper end of the sampling cylinder (4), and the gear ring (32) is meshed with the first driving gear (31).

7. A deep coal seam pressure-maintaining coring gas content testing device according to claim 6, characterized in that: A second driving gear (51) is rotatably provided on the second slide plate (5), and the second driving gear (51) is slidably connected to the square shaft (10); A transmission gear (52) is also rotatably provided on the second slide plate (5), and the transmission gear (52) is meshed with the second driving gear (51); The second slide plate (5) is also rotatably provided with a screw gear (53), the screw gear (53) is meshed with the transmission gear (52), and the screw gear (53) is fixed to the transmission screw (6).

8. The deep coal seam pressure-maintaining coring gas content testing device according to claim 1 is characterized in that: A drill bit (81) is fixed to the bottom of the grouting pipe (8), grouting holes are distributed around the drill bit (81), and the grouting pipe (8) is connected to the transmission screw rod (6) in a slidable and rotationally restricted manner.

9. The deep coal seam pressure-maintaining coring gas content testing device according to claim 1, characterized in that: Blades (61) are distributed circumferentially around the lower end of the transmission screw (6), one side of the blade (61) is a blade, a rotating shaft (62) is fixed at the center of the blade (61), the rotating shaft (62) is rotatably connected to the side wall of the transmission screw (6), and when two adjacent blades (61) rotate to fit each other, the blades face downwards; A limit block (63) is provided on the side wall of the transmission screw (6) at a position corresponding to each blade (61); A torsion spring (64) is provided between the rotating shaft (62) and the transmission screw rod (6), and the elastic force of the torsion spring (64) causes the blades (61) to rotate in a direction of mutual contact.

10. A sampling method for a deep coal seam pressure-maintained coring gas content testing device, using a deep coal seam pressure-maintained coring gas content testing device according to any one of claims 1 to 9, characterized in that: include: S1, starting the square shaft motor (14) to drive the square shaft (10) to rotate, thereby driving the sampling tube (4) and the transmission screw (6) to rotate, and adjusting the height of the sampling tube (4) by controlling the winch (12) so that the sampling tube (4) gradually contacts and drills into the coal seam; S2. During the process of the sampling barrel (4) drilling into the coal seam, the grouting pipe (8) is drilled in synchronously, and the transmission screw (6) rotates synchronously. The blades (61) cut the coal seam sample during the rotation process, and the sample is transported and discharged upward through the gap between the blades (61). The position of the second slide plate (5) is changed by the driving motor (72), thereby adjusting the depth of the transmission screw (6) extending into the sampling barrel (4) to obtain a sample of a desired length; S3, injecting grout into the grouting pipe (8) through the grouting hole (71) so that the grout seals the lower end of the sampling tube (4); after the grouting is completed, waiting for the grout to solidify to ensure that the lower end of the sampling tube (4) is airtight to prevent the sample from leaking from the bottom; S4, start the winch (12), lift the sampling tube (4), separate the sampling tube (4) and the transmission screw (6) from the coal seam, adjust the slide rail (2) to a horizontal state through the hydraulic cylinder (13), take out the sample in the sampling tube (4), and conduct a test.

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