A rapid extraction sampling device based on coal mine gas extraction

Abstract

This application discloses a rapid gas extraction and sampling device based on coal mine gas extraction, relating to the field of sampling and detection technology. It includes a tube with connecting threads at both ends of its outer wall. Drill rods and drill bits are respectively connected to the connecting threads at both ends of the tube. A magnetic stop is fixedly installed at the root of the front connecting thread, and a blocking block is fixedly installed at the root of the rear connecting thread. A sliding sleeve assembly is fitted onto the tube section between the magnetic stop and the blocking block. A sampling chamber is provided inside the tube, with a first orifice and a second orifice opened on the tube wall. Both the second orifice and the first orifice are through holes penetrating the tube. This achieves the technical effect of preventing coal blocks from getting stuck at the front end of the sampling chamber and ensuring uniform air pressure on both sides of the tube, thus preventing coal slag from accumulating on one side during cleaning.

Description

Technical Field

[0001] This invention relates to the field of coal seam sampling technology, and in particular to a rapid sampling device based on coal mine gas extraction. Background Technology

[0002] Coal seam gas content is a fundamental parameter for mine gas drainage design and disaster forecasting. Accurate determination of coal seam gas content ensures safe production in coal mines and protects the lives of coal miners. Existing technology includes a Chinese patent with authorization announcement number CN111006900B, which discloses a fixed-point sampling device and method for testing coal seam gas content through boreholes. The device includes a tubing with threaded connections at both ends of its outer wall. A magnetic stop and a blocking block are fixedly installed at the root of the threads. A sliding sleeve assembly is fitted onto the section of the tubing between the magnetic stop and the blocking block, with its tail sealed to the blocking block. A sampling cavity is located in the hollow part of the inner wall of the tubing, and an orifice is opened in the tubing wall. The sampling method includes the following steps: 1. Installing the sampling device; 2. Drilling the test borehole; 3. Sealing and sampling; 4. On-site desorption.

[0003] The aforementioned device directly collects samples at fixed points and seals them during the drilling process, avoiding significant gas leakage and loss. However, during drilling, there is a risk that large chunks of coal may fall into the borehole from the coal seam around the tube. These large chunks may become stuck in the sampling chamber below the borehole, preventing the device from continuing sampling. Furthermore, the test borehole drilling process involves supplying air or water to the drill rod, with pressurized water or air sequentially passing through the drill rod, two one-way valves, and the sampling chamber opening to flush out coal and rock debris drilled by the drill bit. Since the borehole opening is off-center, the pressure around the tube is uneven, easily causing debris to clog one side of the tube. Summary of the Invention

[0004] This application provides a rapid sampling device for coal mine gas extraction, which solves the technical problem in the prior art where coal slag easily accumulates and gets stuck at the front end of the sampling chamber. It achieves the technical effect of making it less likely for coal blocks to get stuck at the front end of the sampling chamber, while ensuring uniform air pressure on both sides of the tube, so that coal slag does not easily accumulate on one side when being cleaned.

[0005] This application provides a rapid gas extraction sampling device based on coal mine gas extraction, including a tube. The front and rear ends of the outer wall of the tube are connected by threads. The threads at both ends of the tube are respectively connected to a drill rod and a drill bit. A magnetic stop is fixedly installed at the root of the front thread and a blocking block is fixedly installed at the root of the rear thread. A sliding sleeve assembly is fitted on the tube section between the magnetic stop and the blocking block. A sampling chamber is provided inside the tube. The sampling chamber is a cavity formed by closing both ends of the tube section. A first orifice is opened on the tube wall of the sampling chamber. The first orifice is located on the sliding section in front of the sliding sleeve assembly. The sampling chamber wall is also provided with a second orifice. The second orifice is located in the sampling chamber on the side away from the first orifice. The planes where the second orifice and the first orifice are located are symmetrical about the plane passing through the axis of the sampling chamber. Both the second orifice and the first orifice are through holes that penetrate the tube.

[0006] Preferably, the diameter of the second orifice and the first orifice are both 5 cm to 10 cm, and the two orifices are equal.

[0007] Preferably, the first orifice edge is provided with a first elastic part, and the second orifice edge is provided with a second elastic part. Both the first elastic part and the second elastic part are made of elastic rubber, and they have the same shape and size.

[0008] Preferably, the outer ring edges of both the first elastic part and the second elastic part are detachably fixed to the side wall of the tube. Both the first elastic part and the second elastic part are circular rings in whole, and the openings at their centers are the first orifice and the second orifice, respectively. The ring width of both the first elastic part and the second elastic part is 3.5 cm to 5.5 cm, and the thickness of both is the same as the thickness of the tube.

[0009] Preferably, the cross-sections of the first elastic part and the second elastic part are both arc-shaped, and the first elastic part and the second elastic part are both concave to the side wall of the tube, so that the first orifice and the second orifice are both located inside the sampling chamber.

[0010] Preferably, the axial height of both the first and second elastic parts is 1.5 cm to 2 cm. Multiple spacer bars are fixed on both the first and second elastic parts. The spacer bars are cylindrical objects made of elastic rubber. One end of each of the multiple spacer bars is coaxially distributed in a ring on the side of the first or second elastic part away from the sampling chamber. The radius of the ring where the multiple spacer bars are fixed to one end of the first or second elastic part is half the sum of the inner and outer radii of the first or second elastic part. The movable end of the multiple spacer bars faces the axis of the first or second orifice. The length direction of the spacer bars forms an angle of 30 degrees to 35 degrees with the end face of the first or second elastic part.

[0011] Preferably, the axial positions of the first elastic part and the second elastic part are offset, so that the axes of the first orifice and the second orifice do not coincide, and the vertical distance between the extension lines of the axis lines of the first orifice and the second orifice is 8 cm to 12 cm.

[0012] Preferably, a guide sieve rod is fixed on the first elastic part or the second elastic part. The guide sieve rod is rod-shaped, and its two ends are respectively fixed to the end face of the first elastic part and the second elastic part near the sampling chamber. The number of guide sieve rods is the same as the number of spacers, and the positions of the multiple guide sieve rods correspond one-to-one with the spacers.

[0013] Preferably, the guide screen rod is hollow inside and made of elastic rubber. A limiting membrane is provided in the middle of the length direction of the internal space of the guide screen rod. The limiting membrane is used to divide the internal space of the guide screen rod into upper and lower cavities. The guide screen rod is filled with liquid, preferably liquid lubricant or water. Two magnetic levitation balls are slidably arranged inside each guide screen rod, and the two magnetic levitation balls are respectively located in the upper and lower cavities of the guide screen rod. The magnetic levitation balls are hollow ellipsoids, so that they can float in the liquid. The magnetic levitation balls are permanent magnets.

[0014] Preferably, two annular bladders are slidably fitted around the periphery of the multiple guide screen rods. The positions of the two annular bladders correspond to the magnetic levitation balls in the upper and lower cavities of the guide screen rods, respectively. The annular bladders are made of elastic rubber and are circular in shape. The annular bladders are hollow inside and filled with magnetic powder. The magnetic powder can be magnetically attracted by the magnetic levitation balls. The weight of the annular bladder is less than the buoyancy of the magnetic levitation balls. Therefore, when the magnetic levitation balls slide inside the guide screen rods due to buoyancy, they can drive the annular bladders to move up and down, so that the position of the annular bladders always corresponds to the magnetic levitation balls. Thus, when the guide screen rods rotate with the tube, there is always an annular bladder located in the middle of the guide screen rods, which defines the shape of the guide screen rods in the middle.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: By setting up a first orifice and a second orifice, when a coal block enters the first orifice, as the tube rotates, the larger coal blocks, affected by gravity, roll more slowly and remain relatively stationary at the front end of the tube, thus falling out of the tube through the second orifice. Smaller coal blocks, more affected by airflow and tube movement, roll to the rear end of the sampling chamber before the larger ones, completing the sampling. Secondly, when air is supplied to the drill rod, pressurized air is blown out through the drill rod, one-way valve, first orifice, and second orifice. Air pressure exists on both sides of the tube, ensuring that coal seam debris at the drill bit is evenly and symmetrically blown out of the borehole around the tube, preventing the risk of coal slag accumulating on one side of the drill rod and clogging the borehole. This solves the technical problem of coal slag accumulation and jamming at the front end of the sampling chamber in existing technologies, achieving the technical effect of preventing coal blocks from getting stuck at the front end of the sampling chamber and ensuring uniform air pressure on both sides of the tube, thus preventing coal slag from accumulating on one side during cleaning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the tube of the rapid extraction and sampling device based on coal mine gas extraction according to the present invention; Figure 2 This is a schematic diagram of the horizontal drilling coal seam state of the rapid extraction and sampling device based on coal mine gas extraction according to the present invention. Figure 3This is a schematic diagram of the internal structure of the tube in Embodiment 2 of the rapid extraction and sampling device for coal mine gas extraction according to the present invention; Figure 4 This is a schematic diagram of the state of the first elastic part of the coal block colliding with the rapid extraction and sampling device based on coal mine gas extraction according to Embodiment 2 of the present invention; Figure 5 This is a top view of the first orifice of Embodiment 2 of the rapid extraction and sampling device based on coal mine gas extraction of the present invention; Figure 6 This is a partial cross-sectional schematic diagram of the first and second orifices of Embodiment 3 of the rapid extraction and sampling device for coal mine gas extraction according to the present invention; Figure 7 This is a top view of the first orifice of Embodiment 3 of the rapid extraction and sampling device for coal mine gas extraction of the present invention; Figure 8 This is a schematic diagram of the deformation state of the second orifice caused by the collision with a coal block in Embodiment 3 of the rapid extraction and sampling device based on coal mine gas extraction of the present invention. Figure 9 This is a schematic diagram showing the relative positions of the first and second orifices in Embodiment 4 of the rapid extraction and sampling device for coal mine gas extraction according to the present invention. Figure 10 This is a schematic diagram of the guide screen rod position distribution from an upward view of the first orifice in Embodiment 4 of the rapid extraction and sampling device for coal mine gas extraction of the present invention. Figure 11 This is a schematic diagram of the cross-sectional structure of the guide screen rod in Embodiment 5 of the rapid extraction and sampling device for coal mine gas extraction according to the present invention.

[0017] In the picture: 100. Tube; 110. Sampling chamber; 200. Sliding sleeve assembly; 300. One-way valve; 400. First orifice; 410. First elastic part; 420. Spacer bar; 500. Second orifice; 510. Second elastic part; 600. Guide sieve rod; 610. Magnetic levitation ball; 620. Limiting membrane; 630. Encircling bag; 640. Magnetic powder; 700. Magnetic stop block; 710. Blocking block; 800. Drill rod; 810. Drill bit. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0019] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Example 1: As Figure 1 and Figure 2 As shown, this application discloses a rapid gas extraction sampling device based on coal mine gas extraction, comprising a tube 100. The outer wall of the tube 100 has connecting threads at both ends, which are used to connect a drill rod 800 and a drill bit 810, respectively. A magnetic stop block 700 is fixedly installed at the root of the front connecting thread, and a blocking block 710 is fixedly installed at the root of the rear connecting thread. A sliding sleeve assembly 200 is fitted onto the tube section between the magnetic stop block 700 and the blocking block 710. The tail of the sliding sleeve assembly 200 is sealed and bonded to the blocking block 710. A sampling chamber 110 is provided in the hollow part of the inner wall of the tube 100. The sampling chamber 110 is a cavity formed by closing both ends of a pipe section. A first orifice 400 is opened on the pipe wall of the sampling chamber 110, and the first orifice 400 is located on the sliding section in front of the sliding sleeve assembly 200. One-way valves 300 are respectively installed on the two end walls of the sampling chamber 110. The first orifice 400 is used as the inlet of the coal sample during sampling, and as the outlet of pressurized water or air when water or ventilation is carried out in the borehole to flush out the drilling debris. The pipe 100 serves as a water and ventilation pipe when water or ventilation is carried out in the borehole, and at the same time, the hollow part of the pipe 100 also serves as the sampling chamber 110 for coal storage during sampling.

[0022] The sampling chamber 110 is also provided with a second orifice 500. The second orifice 500 is located in the sampling chamber 110 on the side away from the first orifice 400. The planes containing the second orifice 500 and the first orifice 400 are symmetrical about the plane passing through the axis of the sampling chamber 110. Both the second orifice 500 and the first orifice 400 are through holes penetrating the tube 100. The diameter of the second orifice 500 and the first orifice 400 is 5 cm to 10 cm, and the two orifices are equal.

[0023] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: In this embodiment, by setting a first orifice 400 and a second orifice 500, when a coal block enters the first orifice 400, as the tube 100 rotates, the larger coal blocks are affected by gravity and roll more slowly, remaining relatively stationary at the front end of the tube 100, thus being able to fall out of the tube 100 through the second orifice 500. The smaller coal blocks are affected more by the airflow, the feed of the tube 100, and the rotation of the drill rod 800, thus rolling to the end of the sampling chamber 110 near the drill rod 800 for storage before the larger coal blocks. Furthermore, when the drill rod 800 is supplied with air, the positive pressure air is blown out through the drill rod 800, the one-way valve 300, the first orifice 400, and the second orifice 500. The air pressure is uniform on both sides of the outer side of the tube 100, so that the coal seam debris at the drill bit 810 can be blown out of the borehole evenly and symmetrically around the tube 100. This avoids the risk of coal slag accumulating on one side of the drill rod 800 and blocking the borehole. This solves the technical problem in the prior art that coal slag is easy to accumulate and get stuck at the front end of the sampling chamber 110. It achieves the technical effect of making it difficult for coal blocks to get stuck at the front end of the sampling chamber 110, while making the air pressure uniform on both sides of the tube 100, so that coal slag is not easy to accumulate on one side when it is cleaned.

[0024] Example 2: Considering that in Example 1 above, when some large coal blocks fall into the first orifice 400 or the second orifice 500, due to the irregular shape of the coal blocks, the front half of the coal block may be able to pass through the first orifice 400 or the second orifice 500, but the rear half is larger than the diameter of the first orifice 400 and cannot enter. Therefore, as the tube 100 rotates continuously, the coal block rubs against the first orifice 400 or the second orifice 500, thus getting stuck inside the first orifice 400 or the second orifice 500, causing the orifice to be blocked. Therefore, the device needs to be improved, such as... Figures 3 to 5 As shown, the specific structure is as follows: The first orifice 400 is provided with a first elastic part 410 at its edge, and the second orifice 500 is provided with a second elastic part 510 at its edge; The first elastic part 410 and the second elastic part 510 are both made of elastic rubber, and they have the same shape and size. The outer ring edges of both the first elastic part 410 and the second elastic part 510 are detachably fixed to the side wall of the tube 100. Both the first elastic part 410 and the second elastic part 510 are circular rings, and the openings at their centers are the first orifice 400 and the second orifice 500, respectively. The ring width of both the first elastic part 410 and the second elastic part 510 is 3.5 cm to 5.5 cm, and their thickness is the same as that of the tube 100.

[0025] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: In this embodiment, by setting a first elastic part 410 and a second elastic part 510, when a large coal block falls to the first opening 400 or the second opening 500, the first elastic part 410 or the second elastic part 510 can bounce the large coal block away. If a coal block happens to get stuck, with the rotation of the tube 100 and the elastic deformation of the first elastic part 410 or the second elastic part 510, the stuck coal block can gradually get out of the opening.

[0026] Example 3: Considering that although the first orifice 400 and the second orifice 500 in Example 2 can prevent some larger coal blocks from entering and allow coal blocks stuck at the orifice to be dislodged with rotation, larger coal blocks may still get stuck in the first orifice 400 or the second orifice 500 for a period of time, thus temporarily hindering the sampling of the coal seam. Furthermore, it is difficult for workers to determine the condition of the orifice, and therefore some sampling opportunities may be missed. Therefore, improvements to the device are needed, such as... Figures 6 to 8 As shown, the specific structure is as follows: The cross-sections of the first elastic part 410 and the second elastic part 510 are both arc-shaped. The first elastic part 410 and the second elastic part 510 are both recessed into the side wall of the tube 100, so that the first orifice 400 and the second orifice 500 are both located inside the sampling chamber 110. The axial height of the first elastic part 410 and the second elastic part 510 is 1.5 cm to 2 cm.

[0027] Multiple spacer bars 420 are fixed on both the first elastic part 410 and the second elastic part 510. The spacer bars 420 are cylindrical bodies made of elastic rubber. One end of each of the multiple spacer bars 420 is coaxially distributed in a ring on the side of the first elastic part 410 or the second elastic part 510 away from the sampling chamber 110. The radius of the ring where the multiple spacer bars 420 are fixed to one end of the first elastic part 410 or the second elastic part 510 is half the sum of the inner and outer radii of the first elastic part 410 or the second elastic part 510. The movable end of the multiple spacer bars 420 faces the axis of the first orifice 400 or the second orifice 500. The length direction of the spacer bars 420 forms an angle of 30 degrees to 35 degrees with the end face of the first elastic part 410 or the second elastic part 510.

[0028] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: In this embodiment, by setting a spacer bar 420, larger coal blocks are less likely to approach the first orifice 400 or the second orifice 500. Simultaneously, the first elastic part 410 or the second elastic part 510 and the spacer bar 420 are both inclined, making it less likely for coal blocks to get stuck at the orifice. Furthermore, by bending the first elastic part 410 and the second elastic part 510 into the sampling chamber 110, the first orifice 400 and the second orifice 500 protrude relatively from the inner wall of the sampling chamber 110. Therefore, coal blocks that meet the sampling size and have already entered the sampling chamber 110 are less likely to fall out of the first orifice 400 or the second orifice 500. Larger coal blocks, due to their greater weight, are more likely to deform the first elastic part 410 or the second elastic part 510, causing them to fall out of the sampling chamber 110 or be bounced back and roll deeper into the sampling chamber 110. This reduces the risk of coal blocks clogging the sampling chamber 110. When the first elastic part 410 or the second elastic part 510 is squeezed by a large coal block inside the sampling chamber 110, the spacer 420 rotates away from the sampling chamber 110 as the first elastic part 410 or the second elastic part 510 deforms. This expands the space between the spacer 420, making it easier for the coal block to roll out of the tube 100.

[0029] Example 4: Considering that in Example 3 above, when the first orifice 400 and the second orifice 500 are coaxial, some coal blocks of the appropriate size may fall out of the sampling chamber 110. Furthermore, larger coal blocks require a certain amount of time to enter from one orifice to the other, and the tube 100 is still rotating when the coal blocks fall. If the tube 100 rotates too quickly, although it can prevent some appropriately sized coal blocks from falling out, larger coal blocks will also have difficulty falling out from the other orifice, thus posing a risk of blockage. Therefore, the device needs to be improved, such as... Figure 9 and Figure 10 As shown, the specific structure is as follows: The axial positions of the first elastic part 410 and the second elastic part 510 are offset, so that the axes of the first orifice 400 and the second orifice 500 do not coincide, and the vertical distance between the extension lines of the axis lines of the first orifice 400 and the second orifice 500 is 8 cm to 12 cm.

[0030] A guide sieve rod 600 is fixed on the first elastic part 410 or the second elastic part 510. The guide sieve rod 600 is rod-shaped, and its two ends are respectively fixed to the end face of the first elastic part 410 and the second elastic part 510 near the sampling chamber 110. The number of guide sieve rods 600 is the same as the number of spacers 420, and the positions of the multiple guide sieve rods 600 correspond one-to-one with the spacers 420.

[0031] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: In this embodiment, the axes of the first orifice 400 and the second orifice 500 are parallel and adjacent in the vertical direction but not coaxial. Multiple guide screen rods 600 are arranged between the first elastic part 410 and the second elastic part 510. When coal blocks enter the sampling chamber 110, coal blocks of the appropriate size directly enter the sampling chamber 110 through the gaps between the guide screen rods 600. Coal blocks larger than the gaps between the guide screen rods 600 roll along the guide screen rods 600 and are guided out of the tube 100. The guide screen rod 600 is located at the middle of the first elastic part 410 and the second elastic part 510, respectively. During the fall of large coal blocks, pressure is applied to the guide screen rod 600, and the top of the guide screen rod 600 pulls the first elastic part 410 and the second elastic part 510, causing the first elastic part 410 and the second elastic part 510 to deform into the sampling chamber 110. This also drives the spacer rod 420 to move inward, thereby preventing more large coal blocks from entering the sampling chamber 110 and causing blockage, while at the same time not hindering small coal blocks from entering the sampling chamber 110. This improves the reliability of the device and the efficiency of the sampling process.

[0032] Example 5: Considering that in Example 4 above, since the guide screen rod 600 is made of elastic material, when a large coal block rolls down to the middle of the guide screen rod 600 along its length, the large mass of the coal block may cause deformation in the middle of the guide screen rod 600, widening the gaps. This could cause the large coal block to detach from the guide screen rod 600 and be difficult to discharge smoothly. If the middle of the guide screen rod 600 is directly fixed, it is easy to cause blockage between the guide screen rods 600. Therefore, the device needs to be improved, such as... Figure 11 As shown, the specific structure is as follows: The guide screen rod 600 is hollow inside and made of elastic rubber. A limiting membrane 620 is provided in the middle of the length direction of the internal space of the guide screen rod 600. The limiting membrane 620 is used to divide the internal space of the guide screen rod 600 into upper and lower cavities. The guide screen rod 600 is filled with liquid, preferably liquid lubricant or water. Two magnetic levitation balls 610 are slidably arranged inside each guide screen rod 600. The two magnetic levitation balls 610 are located in the upper and lower cavities of the guide screen rod 600, respectively. The magnetic levitation balls 610 are hollow ellipsoids, so that they can float in the liquid. The magnetic levitation balls 610 are permanent magnets. Two circumferential pouches 630 are slidably sleeved around the periphery of multiple guide screen rods 600. The positions of the two circumferential pouches 630 correspond to the magnetic levitation balls 610 in the upper and lower cavities of the guide screen rods 600, respectively. The circumferential pouches 630 are made of elastic rubber and are circular in shape. The circumferential pouches 630 are hollow inside and filled with magnetic powder 640. The magnetic powder 640 can be magnetically attracted by the magnetic levitation balls 610. The gravity of the circumferential pouches 630 is less than the buoyancy of the magnetic levitation balls 610. Therefore, when the magnetic levitation balls 610 slide inside the guide screen rods 600 due to buoyancy, they can drive the circumferential pouches 630 to move up and down, so that the position of the circumferential pouches 630 always corresponds to the magnetic levitation balls 610. Thus, when the guide screen rods 600 rotate with the tube 100, there is always one circumferential pouch 630 located in the middle of the guide screen rods 600, which defines the middle part of the shape of the guide screen rods 600.

[0033] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: In this embodiment, a hollow guide screen rod 600 is filled with liquid, and a sliding magnetic levitation ball 610 is set inside the guide screen rod 600. A surrounding bladder 630 is set on the outside of multiple guide screen rods 600, and the surrounding bladder 630 is filled with magnetic powder 640. The magnetic powder 640 attracts the magnetic levitation ball 610, so that the surrounding bladder 630 moves with the magnetic levitation ball 610 as it floats up and down. When the tube 100 rotates, the upper and lower magnetic levitation balls 610 at both ends of the guide screen rod 600 alternately float to the limiting membrane 620, causing the upper and lower magnetic levitation balls 610 to move. The surrounding bag 630 alternately slides to the middle of the guide screen rod 600, restricting the shape of the middle part of the guide screen rod 600 so that large coal blocks can always be between the guide screen rods 600 and roll out of the sampling chamber 110 under the guidance of the guide screen rods 600. At the same time, the surrounding bag 630 slides outside the guide screen rod 600. The relative position of the surrounding bag 630 and the guide screen rod 600 is relatively flexible, so that the coal blocks will not get stuck. The up and down moving surrounding bag 630 can move the coal blocks around it, so that the coal blocks are unlikely to accumulate and block the front end of the sampling chamber 110.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rapid gas extraction sampling device based on coal mine gas extraction, comprising a tube (100), the front and rear ends of the outer wall of the tube (100) are connected by connecting threads, the connecting threads at both ends of the tube (100) are respectively connected to a drill rod (800) and a drill bit (810), a magnetic stop block (700) is fixedly installed at the root of the front connecting thread, and a blocking block (710) is fixedly installed at the root of the rear connecting thread. A sliding sleeve assembly (200) is sleeved on the pipe section between the magnetic stop block (700) and the blocking block (710), and a sampling chamber (110) is provided inside the tube (100). The sampling chamber (110) is a chamber formed by closing both ends of the pipe section. A first orifice (400) is opened on the pipe wall of the sampling chamber (110), and the first orifice (400) is located on the sliding section in front of the sliding sleeve assembly (200). Its features are, The sampling chamber (110) is also provided with a second orifice (500) on its wall. The second orifice (500) is located in the sampling chamber (110) on the side away from the first orifice (400). The planes where the second orifice (500) and the first orifice (400) are located are symmetrical about the plane passing through the axis of the sampling chamber (110). Both the second orifice (500) and the first orifice (400) are through holes that penetrate the tube (100).

2. The rapid extraction and sampling device based on coal mine gas extraction according to claim 1, characterized in that, The diameter of the second orifice (500) and the first orifice (400) are both 5 cm to 10 cm, and the two orifices are equal.

3. The rapid extraction and sampling device based on coal mine gas extraction according to claim 2, characterized in that, The first opening (400) has a first elastic part (410) at its edge, and the second opening (500) has a second elastic part (510) at its edge. Both the first elastic part (410) and the second elastic part (510) are made of elastic rubber and have the same shape and size.

4. The rapid extraction and sampling device based on coal mine gas extraction according to claim 3, characterized in that, The outer ring edges of both the first elastic part (410) and the second elastic part (510) can be detachably fixed to the side wall of the tube (100). Both the first elastic part (410) and the second elastic part (510) are circular rings, and the openings at their centers are the first orifice (400) and the second orifice (500), respectively. The ring width of both the first elastic part (410) and the second elastic part (510) is 3.5 cm to 5.5 cm, and their thickness is the same as that of the tube (100).

5. The rapid extraction and sampling device based on coal mine gas extraction according to claim 4, characterized in that, The cross-sections of the first elastic part (410) and the second elastic part (510) are both arc-shaped. The first elastic part (410) and the second elastic part (510) are both recessed into the side wall of the tube (100), so that the first orifice (400) and the second orifice (500) are both located inside the sampling chamber (110).

6. The rapid extraction and sampling device based on coal mine gas extraction according to claim 5, characterized in that, The axial height of both the first elastic part (410) and the second elastic part (510) is 1.5 cm to 2 cm. Multiple spacer bars (420) are fixed to both the first elastic part (410) and the second elastic part (510). Each spacer bar (420) is a column made of elastic rubber. One end of each spacer bar (420) is coaxially and annularly distributed on the side of the first elastic part (410) or the second elastic part (510) away from the sampling chamber (110). (420) The radius of the ring at one end of the first elastic part (410) or the second elastic part (510) is half the sum of the inner and outer radii of the first elastic part (410) or the second elastic part (510). The movable ends of the plurality of spacers (420) face the axis of the first orifice (400) or the second orifice (500). The length direction of the spacers (420) forms an angle of 30 to 35 degrees with the end face of the first elastic part (410) or the second elastic part (510).

7. The rapid extraction and sampling device based on coal mine gas extraction according to claim 6, characterized in that, The first elastic part (410) and the second elastic part (510) are axially misaligned, so that the first orifice (400) and the second orifice (500) do not coincide in axis. The vertical distance between the extension lines of the axis lines of the first orifice (400) and the second orifice (500) is 8 cm to 12 cm.

8. The rapid extraction and sampling device based on coal mine gas extraction according to claim 7, characterized in that, A guide sieve rod (600) is fixed on the first elastic part (410) or the second elastic part (510). The guide sieve rod (600) is rod-shaped, and its two ends are respectively fixed to the end face of the first elastic part (410) and the second elastic part (510) near the sampling chamber (110). The number of guide sieve rods (600) is the same as the number of spacers (420), and the positions of the multiple guide sieve rods (600) correspond one-to-one with the spacers (420).

9. The rapid extraction and sampling device based on coal mine gas extraction according to claim 8, characterized in that, The guide screen rod (600) is hollow inside and is made of elastic rubber. A limiting membrane (620) is provided in the middle of the length direction of the internal space of the guide screen rod (600). The limiting membrane (620) is used to divide the internal space of the guide screen rod (600) into upper and lower cavities. The guide screen rod (600) is filled with liquid, preferably liquid lubricant or water. Two magnetic levitation balls (610) are slidably arranged inside each guide screen rod (600). The two magnetic levitation balls (610) are located in the upper and lower cavities of the guide screen rod (600) respectively. The magnetic levitation balls (610) are hollow ellipsoids, so that they can float in the liquid. The magnetic levitation balls (610) are permanent magnets.

10. The rapid extraction and sampling device based on coal mine gas extraction according to claim 9, characterized in that, Two slidable rings (630) are slidably fitted around the periphery of multiple guide screen rods (600). The positions of the two rings (630) correspond to the magnetic levitation balls (610) in the upper and lower cavities of the guide screen rods (600), respectively. The rings (630) are made of elastic rubber and are circular in shape. The rings (630) are hollow bladders filled with magnetic powder (640). The magnetic powder (640) can be magnetically attracted by the magnetic levitation balls (610). 30) The gravity it experiences is less than the buoyancy of the magnetic levitation ball (610). Therefore, when the magnetic levitation ball (610) slides inside the guide screen rod (600) due to buoyancy, it can drive the surrounding bag (630) to move up and down, so that the position of the surrounding bag (630) always corresponds to the magnetic levitation ball (610). Thus, when the guide screen rod (600) rotates with the tube (100), there is always a surrounding bag (630) located in the middle of the guide screen rod (600), which limits the shape of the middle part of the guide screen rod (600).

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