Underground in-situ measuring device for coal seam gas content

Abstract

The invention discloses a coal seam gas content underground in-situ measuring device, and relates to the technical field of coal mine gas detection, and the coal seam gas content underground in-situ measuring device comprises: a sampling drill cylinder installed in a drilling well; the drilling sampling device is movably arranged in the sampling drill barrel, and the drilling sampling device and the sampling drill barrel are coaxially arranged; the conveying device is fixed on the inner wall of the sampling drill barrel; the crushing and desorbing device is arranged between the sampling drill barrel and the drilling and sampling device; the temporary storage cavity is positioned from the bottom of the crushing and desorbing device to the end part of the sampling drill barrel; the metering device is arranged above the crushing and desorbing device, and the bottom of the metering device is communicated with the conveying device; and the wind pressure assembly is arranged above the metering device and is fixedly connected with the top of the crushing and desorbing device. According to the device and the method, coal sample sealing storage, efficient desorption, gas dissipation-free collection and accurate data monitoring in underground in-situ gas content measurement are realized, and the reliability of a measurement result and the operation efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas detection technology, and more specifically, to an underground in-situ measurement device for coal seam gas content. Background Technology

[0002] Traditional methods for determining coal seam gas content largely rely on surface laboratory analysis, requiring the transfer of coal samples to the surface. This process easily disrupts the in-situ state of the coal seam, leading to incomplete gas desorption and significant data deviations. During underground sampling, insufficient sealing or limited functionality of the desorption device often results in gas escape, inadequate coal sample fragmentation, and low desorption efficiency, hindering in-situ dynamic monitoring and accurate measurement, thus limiting the accuracy and timeliness of gas content determination. Therefore, it is necessary to provide an in-situ underground device for determining coal seam gas content to address the problems mentioned in the background. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: an in-situ underground device for measuring coal seam gas content, comprising:

[0004] A sampling drill pipe is installed inside the well.

[0005] The drilling sampling device is movable inside the sampling drill barrel, and the two are coaxially arranged;

[0006] The conveying device is fixed on the inner wall of the sampling drill barrel;

[0007] A crushing and desorption device is installed between the sampling drill barrel and the drilling sampling device;

[0008] The temporary storage chamber is located from the bottom of the crushing and desorption device to the end of the sampling drill barrel;

[0009] The metering device is located above the crushing and desorption device, and its bottom is connected to the conveying device.

[0010] The air pressure assembly is located above the metering device and is fixedly connected to the top of the crushing and desorption device.

[0011] Furthermore, preferably, the sampling drill barrel includes:

[0012] The sampling cylinder is placed inside the well and fits snugly against the inner wall of the well.

[0013] A circumferential drill is fixed at the bottom of the sampling cylinder.

[0014] The guide arc ring is fixed at the top to the inner wall of the sampling cylinder and at the bottom to the inner ring of the ring drill.

[0015] Furthermore, as a preferred embodiment, the guide arc ring, the drilling sampling device, and the crushing and desorption device are combined to form a temporary storage cavity.

[0016] Furthermore, preferably, the drilling sampling device includes:

[0017] The movable shaft is movably set at the center of the sampling drill barrel, and a sampling port is provided at the upper part corresponding to the upper part of the crushing and desorption device;

[0018] The screw conveyor shaft is rotatably mounted inside the moving shaft, and the shaft at the center is a hollow structure that is connected to an external pneumatic mechanism.

[0019] A guide ring groove is set at the bottom of the moving shaft, and an adjusting shaft is fixed at the top. The adjusting shaft is slidably connected to the bottom of the screw conveyor shaft.

[0020] The drill bit is fixed at the bottom center of the guide ring groove.

[0021] Furthermore, preferably, the conveying device includes:

[0022] The lower conveyor ring network is set in the temporary storage chamber, with its top fixedly connected to the crushing and desorption device and its bottom fixedly connected to the guide arc ring.

[0023] Multiple multi-stage conveyor rings are vertically distributed and installed inside the crushing and desorption device;

[0024] The upper conveyor ring network connects the upper part of the crushing and desorption device and the metering device;

[0025] The conveying channels are vertically distributed in multiple sets, corresponding to the multi-level conveying rings, connecting adjacent multi-level conveying rings, as well as the multi-level conveying rings and their corresponding lower or upper conveying ring networks.

[0026] Furthermore, preferably, the crushing and desorption device includes:

[0027] The spaced circular surface is fixed to the top of the temporary storage chamber, and its outer side is fixedly connected to the sampling cylinder.

[0028] The crushing components are arranged in multiple vertically, and are fixedly connected to the inner wall of the sampling cylinder and rotatably connected to the outer wall of the drilling sampling device.

[0029] A spring bushing is fitted onto the drilling and sampling device, and is used to fix the top of the spacer circular surface and the bottom of the crushing component.

[0030] Connecting bushings connect two adjacent crushing components, one above the other.

[0031] The control shaft connects the top crushing assembly and the air pressure assembly, and has a feed port on it.

[0032] Furthermore, preferably, the crushing component includes:

[0033] The inner ring crushing teeth are rotatably mounted on the drilling and sampling device;

[0034] The inner guide ring is rotatably connected to the drilling and sampling device at the top and fixedly connected to the top of the inner ring crushing teeth at the bottom.

[0035] The outer ring crushing teeth are fixed inside the sampling drill barrel;

[0036] The outer guide ring is fixedly connected at the top to the sampling drill barrel and at the bottom to the top of the outer ring crushing teeth.

[0037] Furthermore, preferably, the metering device includes:

[0038] The flow chamber is fixed inside the sampling drill barrel, located at the top of the crushing and desorption device, and connected to the top of the conveying device. The flow chamber has a scale on its inner wall.

[0039] The float is placed inside the flow chamber and has a density less than that of gas.

[0040] Furthermore, preferably, the wind pressure assembly includes:

[0041] The limiting cavity is located on the outer wall of the drilling sampling device, at the top of the metering device;

[0042] The pressure ring is movable within the limiting cavity, and its bottom is fixedly connected to the top of the crushing and desorption device.

[0043] The air pressure duct is connected to the top of the limiting cavity.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] In this invention, the coaxial sealing design of the sampling drill barrel and the drilling sampling device, combined with the temporary storage cavity structure of the guide arc ring and the guide ring groove, effectively seals the coal sample and prevents the leakage of gas, ensuring the sealing of the sampling process and improving the reliability of the initial data.

[0046] By using the progressive crushing design of the multi-stage crushing components in the crushing and desorption device, combined with the dynamic adjustment of the crushing force by the air pressure component, the coal sample is subjected to impact-shear composite crushing, which promotes gas desorption efficiency.

[0047] The multi-stage conveying ring and ring network three-dimensional conveying channel design in the conveying device enables efficient collection of desorbed gas through multiple paths, avoiding gas stagnation or escape.

[0048] By using the real-time metering design of the flow chamber and float, the density difference of the float is used to achieve intuitive and visual monitoring of gas desorption, thereby improving the accuracy of data reading.

[0049] The design of the unidirectional rotation of the screw conveyor shaft and the adjusting shaft prevents the coal sample from being thrown out during reverse conveying, ensuring that the sample in the temporary storage chamber is completely transferred and reducing sampling loss.

[0050] By using a staggered sealing design between the control shaft and the feed port, the feeding channel is isolated during the crushing and desorption stage to prevent gas backflow and ensure the independence of the desorption process. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall structure of an underground in-situ measurement device for coal seam gas content.

[0052] Figure 2 A schematic diagram of the sampling drill barrel and drilling sampling device;

[0053] Figure 3 A schematic diagram of the conveying device and the crushing and desorption device;

[0054] Figure 4 This is a schematic diagram of the crushing component structure;

[0055] Figure 5 This is a schematic diagram of the metering device.

[0056] Figure 6 This is a schematic diagram of the wind pressure component structure;

[0057] In the diagram: 1. Sampling drill barrel; 2. Drilling and sampling device; 3. Conveying device; 4. Crushing and desorption device; 5. Temporary storage chamber; 6. Metering device; 7. Air pressure assembly; 11. Sampling cylinder body; 12. Ring drill; 13. Guide arc ring; 21. Moving shaft; 22. Spiral conveying shaft; 23. Guide ring groove; 24. Drill bit; 25. Adjusting shaft; 31. Lower conveying ring network; 32. Multi-stage conveying ring; 33. Conveying channel; 34. Upper conveying ring network; 41. Interval circular surface; 42. Crushing assembly; 43. Spring bushing; 44. Connecting bushing; 45. Control shaft; 61. Flow chamber; 62. Float; 71. Limiting chamber; 72. Pressure ring; 73. Air pressure pipeline; 211. Sampling port; 451. Feed port; 421. Inner ring crushing tooth; 422. Inner guide ring; 423. Outer ring crushing tooth; 424. Outer guide ring. Detailed Implementation

[0058] Please see Figures 1-6 In this embodiment of the invention, an in-situ underground device for measuring coal seam gas content includes:

[0059] Sampling drill pipe 1 is installed inside the well.

[0060] The drilling sampling device 2 is movably installed inside the sampling drill barrel 1, and the two are coaxially arranged.

[0061] The conveying device 3 is fixed on the inner wall of the sampling drill barrel 1;

[0062] The crushing and desorption device 4 is installed between the sampling drill barrel 1 and the drilling sampling device 2;

[0063] Temporary storage chamber 5 is located from the bottom of the crushing and desorption device 4 to the end of the sampling drill barrel 1;

[0064] Metering device 6 is installed above crushing and desorption device 4, and its bottom is connected to conveying device 3;

[0065] The air pressure assembly 7 is located above the metering device 6 and is fixedly connected to the top of the crushing and desorption device 4.

[0066] In this embodiment, the sampling drill barrel 1 includes:

[0067] The sampling cylinder 11 is installed inside the well and fits against the inner wall of the well.

[0068] The ring drill 12 is fixed to the bottom of the sampling cylinder 11;

[0069] The guide arc ring 13 is fixed at the top to the inner wall of the sampling cylinder 11 and at the bottom to the inner ring of the ring drill 12.

[0070] In other words, when sampling and testing the gas content of the coal seam inside the well, the sampling cylinder 11 rotates to drive the ring drill 12 to drill into the coal seam, and the drilling sampling device 2 rotates synchronously to drill into the coal seam. The broken coal sample enters the temporary storage chamber 5 along the guide arc ring 13.

[0071] In this embodiment, the guide arc ring 13, the drilling sampling device 2, and the crushing and desorption device 4 are combined to form a temporary storage chamber 5.

[0072] In this embodiment, the drilling sampling device 2 includes:

[0073] The movable shaft 21 is movably set at the center of the sampling drill barrel 1, and the upper part is provided with a sampling port 211 corresponding to the upper part of the crushing and desorption device 4;

[0074] The screw conveyor shaft 22 is rotatably mounted inside the movable shaft 21, and the shaft at the center is a hollow structure, connected to an external pneumatic mechanism;

[0075] The guide ring groove 23 is set at the bottom of the moving shaft 21, and the top is fixed with an adjusting shaft 25, which is slidably connected to the bottom of the screw conveyor shaft 22 through the adjusting shaft 25;

[0076] The drill bit 24 is fixed at the bottom center of the guide ring groove 23.

[0077] In other words, driven by the moving shaft 21, the screw conveyor shaft 22 and the moving shaft 21 rotate synchronously, simultaneously driving the guide ring groove 23 and the drill bit 24 to rotate, and following the sampling drill barrel 1 to move towards the coal seam for sampling. The obtained sample, under the joint constraint of the drill bit 24 and the guide arc ring 13, enters the temporary storage chamber 5. After obtaining a sufficient amount of sample, the sampling drill barrel 1 stops rotating, and the screw conveyor shaft 22 is pressurized by the external pneumatic mechanism. Under the action of the adjusting shaft 25, the guide ring groove 23 and the drill bit 24 are pushed out, so that the outer edge of the guide ring groove 23... The ring fits into the inner ring of the annular drill 12 to seal the temporary storage chamber 5, preventing the desorbed gas from leaking out and affecting the accuracy of the measurement. Then, the sample inside the temporary storage chamber 5 moves towards the center of the guide ring groove 23 under the guidance of the guide arc ring 13 and the guide ring groove 23. Then, the moving shaft 21 is controlled to move downward, while the screw conveyor shaft 22 rotates inside the moving shaft 21. The coal seam sample in the temporary storage chamber 5 is conveyed upward along the moving shaft 21 through the screw conveyor shaft 22 and conveyed to the upper part of the crushing and desorption device 4 through the sampling port 211 for crushing and desorption.

[0078] In a preferred embodiment, the bottom of the spiral conveying shaft 22 is slidably connected to the adjusting shaft 25, and the spiral conveying shaft 22 and the adjusting shaft 25 can only rotate in one direction. When the drilling and sampling device 2 follows the sampling cylinder 11 to drill into the coal seam, the spiral conveying shaft 22 and the moving shaft 21 rotate in the same direction. At the same time, the spiral conveying shaft 22 and the adjusting shaft 25 are locked together. At this time, the spiral conveying shaft 22 drives the guide ring groove 23 and the drill bit 24 to rotate through the adjusting shaft 25 to drill and break the coal seam. When the spiral conveying shaft 22 conveys the coal seam sample inside the temporary storage cavity 5 upward, the spiral conveying shaft 22 reverses, and the spiral conveying shaft 22 and the adjusting shaft 25 are in a slipping state. As the spiral conveying shaft 22 continues to rotate and move downward, the guide ring groove 23 and the drill bit 24 remain fixed to prevent the guide ring groove 23 from rotating and throwing out the coal seam sample in the center position, which would prevent the spiral conveying shaft 22 from completely conveying the sample inside the temporary storage cavity 5.

[0079] In this embodiment, the conveying device 3 includes:

[0080] The lower conveying ring network 31 is set in the temporary storage chamber 5, with its top fixedly connected to the crushing and desorption device 4 and its bottom fixedly connected to the guide arc ring 13.

[0081] Multiple multi-stage conveyor rings 32 are vertically distributed and installed inside the crushing and desorption device 4;

[0082] The upper conveying ring network 34 connects the upper part of the crushing and desorption device 4 and the metering device 6;

[0083] The conveying channel 33 is vertically distributed in multiple sets, corresponding to the multi-level conveying ring 32, connecting adjacent multi-level conveying rings 32, as well as the multi-level conveying ring 32 and the corresponding lower conveying ring network 31 or upper conveying ring network 34.

[0084] In other words, the sampling drill barrel 1 and the drilling sampling device 2 drill into the coal seam to collect samples. The coal seam is initially broken and enters the temporary storage chamber 5. Some of the gas is desorbed and transported upward along the lower conveying ring network 31. After passing through the multi-stage conveying ring 32 and the conveying channel 33, as well as the upper conveying ring network 34, it enters the metering device 6 for preliminary dispersion statistics. When the spiral conveying shaft 22 transfers the coal seam sample, the sample enters the upper part of the crushing and desorption device 4. The gas desorbed during the transfer process enters the metering device 6 through the upper conveying ring network 34 for statistical analysis. It should be noted that the top of the spiral blades on the spiral conveying shaft 22 is flush with the top of the sampling port 211 on the moving shaft 21, and the top is provided with a sealing surface to prevent the desorbed gas from escaping upward along the inside of the moving shaft 21, which would affect the accuracy of the measurement results.

[0085] In this embodiment, the crushing and desorption device 4 includes:

[0086] The spacer circular surface 41 is fixed to the top of the temporary storage cavity 5, and its outer side is fixedly connected to the sampling cylinder 11;

[0087] The crushing components 42 are arranged in multiple vertically, fixedly connected to the inner wall of the sampling cylinder 11, and rotatably connected to the outer wall of the drilling sampling device 2.

[0088] Spring bushing 43 is sleeved on the drilling sampling device 2 and fixedly connects the top of the interval circular surface 41 and the bottom of the crushing component 42.

[0089] Connecting bushing 44 connects two adjacent crushing components 42;

[0090] The control shaft 45 connects the top crushing assembly 42 and the air pressure assembly 7, and has a feed port 451 on it.

[0091] In this embodiment, the crushing component 42 includes:

[0092] The inner ring crushing tooth 421 is rotatably mounted on the drilling sampling device 2;

[0093] The inner guide ring 422 is rotatably connected to the drilling sampling device 2 at the top and fixedly connected to the top of the inner ring breaking tooth 421 at the bottom.

[0094] The outer ring crushing tooth 423 is fixed inside the sampling drill barrel 1;

[0095] The outer guide ring 424 is fixedly connected at the top to the sampling drill barrel 1 and at the bottom to the top of the outer ring breaking tooth 423.

[0096] In other words, when the screw conveyor shaft 22 and the moving shaft 21 move downwards, the sampling port 211 and the feeding port 451 on the control shaft 45 correspond to each other. Then, the coal seam sample enters the uppermost crushing component 42 through the feeding port 451. After the sample is initially desorbed, that is, the metering device 6 does not produce significant changes and the gas inside the moving shaft 21 is exhausted, the control shaft 45 is driven downwards by the air pressure component 7, offsetting the feeding port 451 and the sampling port 211, so that the crushing and desorption device 4 is only connected to the metering device 6. Then, the sampling drill 1 drives the outer ring crushing teeth 423 and the outer guide ring 424 to rotate, and the control shaft 45 controls the inner ring crushing under the action of the air pressure component 7 and the spring bushing 43. The teeth 421 and the inner guide ring 422 move up and down on the moving shaft 21, applying impact and shear forces to the sample. The coal seam sample is crushed by the inner ring crushing teeth 421 and the outer ring crushing teeth 423, promoting gas desorption. Multiple sets of crushing components 42 are connected by connecting bushings 44 and move synchronously. The distance between the inner ring crushing teeth 421 and the outer ring crushing teeth 423 decreases from top to bottom, and the distance between the crushing teeth also decreases. That is, the sample is crushed from coarse to fine from top to bottom, promoting gas desorption. The desorbed gas is transported upward through the multi-stage conveying ring 32 and the conveying channel 33, and enters the metering device 6 through the upper conveying ring network 34.

[0097] In this embodiment, the measuring device 6 includes:

[0098] The flow chamber 61 is fixed inside the sampling drill barrel 1, located at the top of the crushing and desorption device 4, and connected to the top of the conveying device 3. The flow chamber 61 has a scale on its inner wall.

[0099] The float 62 is located inside the flow chamber 61 and has a density less than that of gas.

[0100] In other words, the desorbed gas enters the flow chamber 61, pushing the float 62 upward. The amount of gas desorption is determined by reading the scale inside the flow chamber 61 in real time.

[0101] In this embodiment, the wind pressure component 7 includes:

[0102] The limiting cavity 71 is set on the outer wall of the drilling sampling device 2 and located at the top of the metering device 6;

[0103] The pressure ring 72 is movably disposed within the limiting cavity 71, and its bottom is fixedly connected to the top of the crushing and desorption device 4;

[0104] The air pressure duct 73 is connected to the top of the limiting cavity 71.

[0105] In other words, before the crushing and desorption device 4 is activated to crush and desorb the coal sample, the air pressure inside the air pressure pipe 73 is increased, pushing the control shaft 45 downward to stagger the feed port 451 and the sampling port 211. Then, when the crushing component 42 crushes the coal sample, the pressure inside the air pressure pipe 73 is controlled to fluctuate within a range. When the pressure inside the air pressure pipe 73 increases, the pressure ring 72 moves downward in the limiting cavity 71, pushing the inner ring crushing tooth 421 downward through the control shaft 45. When the pressure inside the air pressure pipe 73 decreases, the spring bushing 43 rebounds and resets, pushing the inner ring crushing tooth 421 upward to fully crush the coal sample.

[0106] In practice, the equipment is first placed in a predetermined position within the well. The sampling cylinder 11 rotates, driving the annular drill 12 to drill into the coal seam. Simultaneously, driven by the moving shaft 21, the spiral conveyor shaft 22 and the moving shaft 21 rotate synchronously, causing the guide ring groove 23 and the drill bit 24 to rotate for crushing and sampling. The obtained sample, under the combined constraint of the drill bit 24 and the guide arc-shaped ring 13, enters the temporary storage chamber 5. After obtaining a sufficient amount of sample, the sampling cylinder 1 stops rotating. The spiral conveyor shaft 22 is pressurized by an external pneumatic mechanism. Under the action of the adjusting shaft 25, the guide ring groove 23 and the drill bit 24 are pushed out, causing the outer ring of the guide ring groove 23 to fit against the inner ring of the annular drill 12, thus facilitating the temporary storage. During the sealing of cavity 5, some of the gas is desorbed and transported upward along the lower conveying ring network 31. It then passes through the multi-stage conveying ring network 32 and the conveying channel 33, as well as the upper conveying ring network 34, and enters the metering device 6 for preliminary emission statistics. The sample inside the temporary storage cavity 5 then moves towards the center of the guide ring groove 23 under the guidance of the guide arc ring 13 and the guide ring groove 23. Next, the control moving shaft 21 moves downward, aligning the sampling port 211 with the feeding port 451 on the control shaft 45. Simultaneously, the screw conveyor shaft 22 rotates in the opposite direction within the moving shaft 21, transporting the coal seam sample from the temporary storage cavity 5 upward along the moving shaft 21. The coal seam sample then passes through the feeding port 451. The gas desorbed during the transfer process on the uppermost crushing component 42 enters the metering device 6 via the upper conveying ring network 34 for statistical analysis. After the sample is initially desorbed, i.e., the metering device 6 does not produce significant changes and the gas inside the moving shaft 21 is exhausted, the air pressure inside the air pressure pipe 73 is increased through the air pressure component 7, pushing the control shaft 45 downward to offset the feed port 451 and the sampling port 211, so that the crushing and desorption device 4 is only connected to the metering device 6. Then, the sampling drill 1 drives the outer ring crushing teeth 423 and the outer guide ring 424 to rotate, and controls the pressure inside the air pressure pipe 73 to fluctuate within a range, thereby controlling the shaft 45 in the air pressure component 7 and the spring bushing 4. Under the action of 3, the inner ring crushing teeth 421 and the inner guide ring 422 move up and down on the moving shaft 21, applying impact and shear force to the sample. The inner ring crushing teeth 421 and the outer ring crushing teeth 423 crush the coal seam sample, promoting gas desorption. Multiple crushing components 42 are connected by connecting bushings 44 and move synchronously, crushing the sample from top to bottom in a coarse to fine manner, promoting gas desorption. The desorbed gas is transported upward through the multi-stage conveying ring 32 and the conveying channel 33, and enters the metering device 6 through the upper conveying ring network 34. After the coal sample is completely desorbed, the data in the metering device 6 is statistically analyzed to obtain the in-situ gas content value in the mine.

[0107] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An in-situ underground device for measuring coal seam gas content, characterized in that: include: Sampling drill pipe (1) is installed inside the well; The drilling sampling device (2) is movably installed inside the sampling drill barrel (1), and the two are coaxially arranged; The conveying device (3) is fixed on the inner wall of the sampling drill barrel (1); The crushing and desorption device (4) is set between the sampling drill barrel (1) and the drilling sampling device (2); The temporary storage chamber (5) is located from the bottom of the crushing and desorption device (4) to the end of the sampling drill barrel (1); The metering device (6) is set above the crushing and desorption device (4) and its bottom is connected to the conveying device (3); The wind pressure assembly (7) is located above the metering device (6) and is fixedly connected to the top of the crushing and desorption device (4).

2. The in-situ underground coal seam gas content measuring device according to claim 1, characterized in that: The sampling drill pipe (1) includes: The sampling cylinder (11) is set inside the well and fits against the inner wall of the well. A ring drill (12) is fixed to the bottom of the sampling cylinder (11); The guide arc ring (13) is fixed at the top to the inner wall of the sampling cylinder (11) and at the bottom to the inner ring of the ring drill (12).

3. The in-situ underground coal seam gas content measuring device according to claim 2, characterized in that: The guide arc ring (13), drilling sampling device (2) and crushing desorption device (4) are combined to form a temporary storage cavity (5).

4. The in-situ underground coal seam gas content measuring device according to claim 2, characterized in that: The drilling sampling device (2) includes: The movable shaft (21) is movably set at the center of the sampling drill barrel (1), and the upper part is provided with a sampling port (211) corresponding to the upper part of the crushing and desorption device (4). The spiral conveyor shaft (22) is rotatably mounted inside the movable shaft (21), and the shaft at the center is a hollow structure, connected to an external pneumatic mechanism; A guide ring groove (23) is set at the bottom of the moving shaft (21), and an adjusting shaft (25) is fixed at the top. The adjusting shaft (25) is slidably connected to the bottom of the screw conveyor shaft (22). The drill bit (24) is fixed at the bottom center of the guide ring groove (23).

5. The in-situ underground coal seam gas content measuring device according to claim 1, characterized in that: The conveying device (3) includes: The lower conveying ring network (31) is set in the temporary storage chamber (5), with its top fixedly connected to the crushing and desorption device (4) and its bottom fixedly connected to the guide arc ring (13); Multiple multi-stage conveying rings (32) are vertically distributed and installed inside the crushing and desorption device (4); The upper conveying ring network (34) connects the upper part of the crushing and desorption device (4) and the metering device (6). The conveying channel (33) is vertically distributed in multiple sets, corresponding to the multi-level conveying ring (32), connecting adjacent multi-level conveying rings (32), as well as the multi-level conveying ring (32) and the corresponding lower conveying ring network (31) or upper conveying ring network (34).

6. The in-situ underground coal seam gas content measuring device according to claim 5, characterized in that: The crushing and desorption device (4) includes: The spacer circular surface (41) is fixed to the top of the temporary storage cavity (5) and its outer side is fixedly connected to the sampling cylinder (11); The crushing components (42) are arranged in multiple vertically, and are fixedly connected to the inner wall of the sampling cylinder (11) and rotatably connected to the outer wall of the drilling sampling device (2). Spring bushing (43) is fitted on the drilling sampling device (2) and fixedly connects the top of the interval circular surface (41) and the bottom of the crushing component (42); Connecting bushing (44) connects two adjacent crushing components (42) above and below. The control shaft (45) is connected to the top crushing assembly (42) and the air pressure assembly (7), and has a feed port (451) on it.

7. The in-situ underground coal seam gas content measuring device according to claim 6, characterized in that: The crushing component (42) includes: The inner ring crushing tooth (421) is rotatably mounted on the drilling sampling device (2); The inner guide ring (422) is rotatably connected to the drilling sampling device (2) at the top and fixedly connected to the top of the inner ring crushing tooth (421) at the bottom; The outer ring crushing tooth (423) is fixed inside the sampling drill barrel (1); The outer guide ring (424) is fixedly connected at the top to the sampling drill barrel (1) and at the bottom to the top of the outer ring crushing tooth (423).

8. The in-situ underground coal seam gas content measuring device according to claim 1, characterized in that: The metering device (6) includes: The flow chamber (61) is fixed inside the sampling drill barrel (1), located at the top of the crushing and desorption device (4), and connected to the top of the conveying device (3). The flow chamber (61) has a scale on its inner wall. The float (62) is set inside the flow chamber (61) and has a density less than that of gas.

9. The in-situ underground coal seam gas content measuring device according to claim 1, characterized in that: The wind pressure assembly (7) includes: The limiting cavity (71) is set on the outer wall of the drilling sampling device (2) and located at the top of the metering device (6); The pressure ring (72) is movably set in the limiting cavity (71), and its bottom is fixedly connected to the top of the crushing and desorption device (4); The air pressure duct (73) is connected to the top of the limiting cavity (71).

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