Pressure-maintaining gas-collecting quick butt joint structure and pressure-maintaining coring device for quickly measuring gas content of deep coal mine

Abstract

The invention relates to a pressure-maintaining and gas-collecting quick butt joint structure and a pressure-maintaining coring device for quickly measuring the gas content of a deep coal mine. The pressure-maintaining and gas-collecting quick butt joint structure comprises an outer pipe, a butt joint, a sealing head and a gas collecting head, wherein the outer pipe is provided with a side hole; the butt joint is internally provided with a gas flow channel and the outer end is provided with a positioning groove; the butt joint is in threaded connection with the outer pipe, and the inner end of the airflow channel can be communicated with the interior of the outer pipe; the positioning convex part is matched with the positioning groove; one of the sealing head and the gas collecting head can be selectively arranged at the outer end of the butt joint; when the sealing head is installed at the outer end of the butt joint, the sealing head can block the airflow channel of the butt joint. And when the gas collecting head is arranged at the outer end of the butt joint, the gas flow channel is communicated with the gas collecting hole. The pressure-maintaining and gas-collecting quick butt joint structure is suitable for a pressure-maintaining coring device for quickly measuring the gas content of a deep coal mine, has the functions of sealing and gas collection, can be quickly switched, and is resistant to disturbance; rapid butt joint gas collection can be achieved in a closed state, gas leakage is avoided in the whole gas content measurement process, and the gas content can be accurately measured.

Description

Technical Field

[0001] This invention relates to the field of pressure-holding coring technology, and in particular to a pressure-holding gas collection rapid docking structure and a pressure-holding coring device for rapid determination of gas content in deep coal mines. Background Technology

[0002] Energy is the driving force behind rapid socio-economic development, and coal has long dominated my country's energy consumption structure. Accurate determination of methane content is crucial for coal mine gas disaster prevention and control and coalbed methane resource development. However, traditional methods rely on parameters such as gas pressure, coal sample composition, and sampling time, limiting their widespread application in the field. Direct sampling, due to its simplicity and ease of operation—obtaining samples directly from the coal seam—is widely used in gas measurement in major coal mines. Direct sampling is further divided into open sampling and closed sampling. Open sampling obtains samples directly at the borehole opening, but cannot prevent gas loss during the transfer of samples from the bottom of the borehole to a closed desorption tank; this is called gas loss. Gas loss can usually be estimated using empirical formulas, but the accuracy depends on the degree of matching between the formula parameters and the actual coal mine conditions, resulting in unavoidable estimation errors. Closed sampling, on the other hand, obtains samples from the bottom of the borehole and stores them in a sealed container during transfer, effectively preventing gas loss during the transfer process and thus improving the accuracy of methane content determination.

[0003] However, existing equipment lacks a direct, high-fidelity, rapid gas collection docking device suitable for pressure-holding coring units, making it unsuitable for accurate and rapid downhole gas content determination. Furthermore, existing docking gas collection methods involve transferring the coring unit to a surface laboratory and using an additional sealed transfer and docking device. This involves first sealing the gas collection port of the pressure-holding coring unit, and then docking the gas content collection device in a sealed environment. Therefore, this device requires sealing the gas collection port of the coring unit and operating in a sealed environment, making it complex and bulky, unsuitable for rapid downhole measurements. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this invention provides a pressure-holding gas collection rapid docking structure and a pressure-holding core sampler for rapid determination of gas content in deep coal mines.

[0005] This invention is achieved through the following technical solution:

[0006] The pressure-holding and gas-collecting quick docking structure provided in this application includes an outer tube with side holes, a connector with an internal airflow channel and an external positioning groove, a sealed head with an internal positioning protrusion, and a gas-collecting head with an internal gas-collecting hole and an internal positioning protrusion.

[0007] The connector is threaded to the outer tube, and the inner end of the airflow channel can communicate with the interior of the outer tube; the positioning protrusion matches the positioning groove, and the sealing head and the air collecting head can be selectively installed on the outer end of the connector; when the sealing head is installed on the outer end of the connector, the sealing head can block the airflow channel of the connector; when the air collecting head is installed on the outer end of the connector, the airflow channel communicates with the air collecting hole.

[0008] Optionally, a filter membrane is installed inside the side hole of the outer tube.

[0009] Optionally, the sidewall of the positioning groove has a lateral groove; the positioning protrusions of the sealing head and the air collecting head have lateral protrusions that can be engaged in the lateral grooves.

[0010] Optionally, the sealing head can be magnetically attached to the docking head, and / or the gas collecting head can be magnetically attached to the docking head.

[0011] Optionally, the side hole of the outer tube is a stepped hole, an end face seal is provided between the inner end of the connector and the outer tube, and a side seal is provided on the side wall between the connector and the outer tube.

[0012] Optionally, one end of the airflow channel opens onto the outer end face of the connector, and the other end of the airflow channel opens onto the side of the connector.

[0013] Optionally, the sidewall of the positioning protrusion of the sealing head is provided with a first sealing element; the sidewall of the positioning protrusion of the air collecting head is provided with a second sealing element.

[0014] Optionally, the outer end face of the sealing head has two rectangular grooves.

[0015] The pressure-maintaining coring device for rapid determination of gas content in deep coal mines provided in this application includes the aforementioned pressure-maintaining and gas-gathering rapid docking structure, a central rod connected to the core tube at its lower end, a core tube installed inside the outer tube, a rock sample crushing mechanism installed inside the core tube, a flap valve installed inside the lower end of the outer tube, and a coring drill bit connected to the lower end of the outer tube.

[0016] The method for using the pressure-holding core sampler for rapid determination of gas content in deep coal mines provided in this application is characterized by...

[0017] Includes the following steps:

[0018] In the initial state, the sealing head is installed on the outside of the joint to block the airflow channel of the joint, and the flap valve is opened; coal samples are obtained by the pressure-holding core sampler for rapid determination of gas content in deep coal mines, and the coal samples are stored in the core tube inside the core sampler.

[0019] After core sampling is completed, the core tube is lifted upwards. Once the core tube is lifted to a certain height, the flap valve closes.

[0020] The core extractor is removed from the borehole as a whole, the connecting sleeve is removed, and the drive shaft is connected to the power drive device. The power drive device drives the cutter head inside the core tube to rotate, thereby achieving coal sample crushing.

[0021] Remove the sealed head, install the gas collecting head on the outer end of the connector, connect the gas collecting pipe to the gas collecting connector, connect the gas collecting pipe to the gas content measuring device, and connect the airflow channel to the gas collecting hole. Measure the gas content using the gas content measuring device.

[0022] Compared with the prior art, this application has at least the following beneficial effects:

[0023] 1. The pressure-holding and gas-collecting rapid docking structure of this application is suitable for pressure-holding core sampling devices for rapid determination of gas content in deep coal mines. It also has the functions of sealing, gas collection and rapid switching, and is resistant to disturbance. It can quickly dock and collect gas in a closed state, which is conducive to achieving gas content determination without gas leakage throughout the entire process.

[0024] 2. This application has a filter membrane installed at the gas collection inlet, which can avoid coal dust blockage, water and oil pollution and chemical corrosion, effectively prevent gas sample distortion and desorption process suppression, reduce key data errors, and facilitate accurate measurement of gas content;

[0025] 3. The pressure-holding coring device for rapid determination of gas content in deep coal mines in this application can not only perform pressure-holding coring, but also facilitate gas content measurement. At the same time, it has the advantage of accurate gas content determination of the pressure-holding coring method, which greatly improves the accuracy, completeness and efficiency of gas content determination. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the pressure-holding gas collection rapid docking structure and the pressure-holding core sampler in the accurate state for rapid determination of gas content in deep coal mines, as shown in the embodiment.

[0028] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0029] Figure 3 This is a perspective view of the connector from a first-view perspective in the embodiment;

[0030] Figure 4 This is a perspective view of the connector from a second viewpoint in the embodiment;

[0031] Figure 5 This is a perspective view of the sealed head in the embodiment;

[0032] Figure 6 This is a schematic diagram of the pressure-holding gas collection rapid docking structure and the pressure-holding core sampler gas collection state for rapid determination of gas content in deep coal mines in the embodiment.

[0033] Figure 7 for Figure 6 Enlarged view of a section at point B in the middle. Figure 7 The dashed arrows in the image indicate the direction of gas flow.

[0034] Figure 8 This is a perspective view of the gas collecting head in the embodiment;

[0035] Figure 9 This is a perspective view of the rock sample crushing mechanism in the embodiment;

[0036] Figure 10 This is a cross-sectional view of the rock sample crushing mechanism installed in the cutter holder in the embodiment. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] like Figure 1 As shown in the preferred embodiment of the present invention, a pressure-holding core sampler for rapid determination of gas content in deep coal mines includes an outer tube 1, a central rod 2, a core tube 3, a rock sample crushing mechanism 4, a flap valve, and a core drill bit 6.

[0042] The lower end of the outer tube 1 is connected to the core drill bit 6. The core tube 3 is installed inside the outer tube 1. The upper end of the core tube 3 is connected to the center rod 2. The flap valve is installed inside the outer tube 1 and located at the lower part of the outer tube 1. The rock sample crushing mechanism 4 is installed inside the core tube 3.

[0043] The flap valve includes a valve seat 51, a valve cover 52, and an elastic element 53. The valve seat 51 is fixed inside the outer tube 1. One side of the valve cover 52 is rotatably connected to the upper end of the valve seat 51. The elastic element 53 acts on the valve seat 51 and the valve cover 52. Under the action of the elastic element 53, the valve cover 52 tends to close with the valve seat 51.

[0044] The middle section of the outer pipe 1 serves as the gas collection section, and a gas collection docking device 9 is operably installed by openings in the pipe wall of the middle section of the outer pipe 1. For example... Figures 2-8 As shown, the docking device 9 includes a docking joint 91, a sealing head 92, and a gas collecting head 97.

[0045] The outer tube 1 has a side hole on its side wall, and the side hole has a threaded section. The connector 91 is installed in the threaded hole of the outer tube 1 by means of threads to prevent the connector 91 from falling off, while also achieving a stable connection.

[0046] like Figure 2 As shown, the side hole of the outer tube 1 is a stepped hole. The inner end of the connector 91 is provided with an end face seal 93, and the side wall of the connector 91 is provided with a side seal 94. Both the end face seal 93 and the side seal 94 are sealed by sealing rings to prevent gas leakage.

[0047] An airflow channel 911 is provided in the middle of the connector 91. The airflow channel 911 can be pressure maintained by the thread of the connector 91 and the end face seal 93.

[0048] Optional, such as Figure 2 , Figure 4As shown, one end of the airflow channel 911 opens onto the outer end face of the connector 91, and the other end opens onto the side of the connector 91. The side opening of the airflow channel 911 is located inside the side seal 94. Rotating the connector 91 allows the end face seal of the connector 91 to be established or disengaged. As shown in Figure 2, the end face seal 93 is sealed with the inner step of the side hole of the outer tube 1, preventing the medium inside the outer tube 1 from entering the airflow channel 911; Figure 7 As shown, when the connector 91 is rotated outward a certain distance, there is a gap between the end face seal 93 and the inner step of the side hole of the outer tube 1. The end face seal of the connector 91 is released, and the medium in the outer tube 1 can enter the airflow channel 911. During this process, the side seal 94 is always in sealing cooperation with the outer tube 1.

[0049] The outer end of the connector 91 is provided with a positioning groove 912, and the inner end of the sealing head 92 is provided with a positioning protrusion that matches the positioning groove 912. The positioning groove 912 and the positioning protrusion are in concave-convex fit, which can realize the connection between the connector 91 and the sealing head 92.

[0050] As a preferred option, such as Figure 3 , Figure 5 As shown, there is a lateral groove 913 on the side wall of the positioning groove 912. Correspondingly, there is a lateral protrusion 922 on the positioning protrusion of the sealing head 92. The lateral protrusion 922 can be inserted into the lateral groove 913, which can realize the circumferential positioning of the connector 91 and the sealing head 92.

[0051] In some embodiments, a first magnet 95 is provided inside the sealing head 92, which can magnetically attract the connector 91, enabling a stable connection between the sealing head 92 and the connector 91. A first sealing element 96 is provided on the sidewall of the positioning protrusion of the sealing head 92 to prevent gas leakage in a sealed state, forming a double seal with the connector 91. By combining threads and magnetism, sealing and connection are integrated in an extremely confined space.

[0052] like Figure 5 As shown, the outer end face of the sealing head 92 has two rectangular grooves 921, which can be removed using tools such as tweezers, but magnetic force needs to be overcome. The positioning protrusion of the sealing head 92 can mate with the positioning groove 912 of the connector 91, and then the thread of the connector 91 can be tightened to achieve a seal.

[0053] like Figures 6-8 As shown, the inner end of the air collecting head 97 has a positioning protrusion that matches the positioning groove 912 of the connector 91. The positioning groove 912 and the positioning protrusion engage to connect the connector 91 and the air collecting head 97. The positioning protrusion of the air collecting head 97 has a lateral protrusion 922 that can be engaged in the lateral groove 913.

[0054] A second magnet 98 is provided at the inner end of the gas collecting head 97. The second magnet 98 can be magnetically attracted to the connector 91, so as to achieve a stable connection between the gas collecting head 97 and the connector 91. A second sealing element 99 is provided on the side wall of the positioning protrusion of the gas collecting head 97 to prevent lateral leakage of gas in the docked state.

[0055] The gas collecting head 97 has a gas collecting hole 971 in the middle, and the outer end of the gas collecting head 97 can be connected to a gas collecting hose. The gas collecting hose is used to connect to the gas collection device, which allows the gas in the cabin to enter the gas collection device, thereby measuring the gas content.

[0056] In some embodiments, a filter membrane 13 is installed at the inner end of the side hole of the outer tube 1, and the filter membrane 13 is located inside the connector 91.

[0057] As a preferred option, the filter membrane 13 is a PTFE (polytetrafluoroethylene) filter membrane, which can efficiently separate gas from coal dust impurities, completely avoid clogging and corrosion, ensure the purity and integrity of the gas sample, and ensure the authenticity of the desorption process and "zero" escape collection with its rapid gas response capability, providing indispensable technical support for the accuracy and reliability of core gas data.

[0058] In some embodiments, a plug 10 is installed in the pipe wall of the middle section of the outer pipe 1. The plug 10 is located above the gas collection docking device 9 and can be used as a backup safety pressure relief device.

[0059] Optionally, plug 10 is a G1-8 plug.

[0060] In some embodiments, the gas gathering docking device 9 has an overall length of about 30mm, a compact structure, and is very lightweight, which is beneficial for downhole use.

[0061] like Figure 9 As shown, the rock sample crushing mechanism 4 includes a drive shaft 41, a cutter bar 42, and a cutter head. The upper end of the cutter bar 42 is connected to the drive shaft 41, and the lower end of the cutter bar 42 extends into the core tube 3. The lower end of the cutter bar 42 is connected to the cutter head. Optionally, the upper end of the cutter bar 42 is threadedly connected to the drive shaft 41.

[0062] In some embodiments, the cutter head is designed with three layers. Specifically, the cutter head includes a primary blade 43, a secondary blade 44, and a tertiary blade 45 arranged from top to bottom, with the primary blade 43 and the secondary blade 44 arranged at an angle. The bottom tertiary blade 45 acts as a sweeping blade, which can be used to move the coal dust accumulated at the bottom; the middle secondary blade 44 is mainly for secondary crushing to increase crushing efficiency; and the top primary blade 43 is for primary crushing, mainly for cutting columnar coal samples.

[0063] In some embodiments, there is an angle θ between the third-stage blade 45 and the second-stage blade 44.

[0064] In some embodiments, a central rod guide tube 7 is coaxially mounted on the upper end of the outer tube 1, and the central rod 2 is installed inside the central rod guide tube 7 and slides therewith. The central rod guide tube 7 is used to guide the axial movement of the central rod 2.

[0065] In some embodiments, the lower end of the center rod 2 is connected to the tool holder 8, the tool rod 42 is installed in the tool rod hole in the center of the tool holder 8 and is clearance-fitted with it, the tool head is located below the tool holder 8, and the upper end of the core tube 3 is threadedly connected to the tool holder 8.

[0066] In some embodiments, such as Figure 10 As shown, the tool holder 42 has a first outer step 46, the transmission shaft 41 has a second outer step 47, and the tool holder 8 is restricted between the first outer step 46 and the second outer step 47. Under the action of the first outer step 46 and the second outer step 47, the axial positioning of the tool holder 42 is achieved, the axial displacement of the tool holder 42 is restricted, and the rotational degree of freedom of the tool holder 42 is retained.

[0067] In some embodiments, the center rod 2 is threadedly connected to the tool holder 8 via a connecting sleeve 11. Optionally, the upper end of the connecting sleeve 11 is connected to the lower end of the center rod 2 via a pin 12, the lower end of the connecting sleeve 11 is sleeved on the tool holder 8, and the drive shaft 41 is located inside the connecting sleeve 11.

[0068] The drive shaft 41 is used to connect to the power drive device, which drives the rock sample crushing mechanism 4 to rotate. It is worth noting that the power drive device can be an electric motor, a pneumatic motor, or other unit capable of providing rotational power.

[0069] In some embodiments, pin 12 is an R2-d46 pin.

[0070] The following is the operating procedure for using a pressure-holding coring device for rapid determination of gas content in deep coal mines in this embodiment:

[0071] S1, In the initial state, the sealing head 92 is installed on the outer end of the connector 91 to block the airflow channel 911 of the connector 91. The core tube 3 is located inside the valve seat 51. Under the obstruction of the core tube 3, the valve cover 52 is opened. The coal sample is obtained by the pressure-holding core sampler for rapid determination of gas content in deep coal mines driven by the drill rod. The coal sample is stored in the core tube 3 inside the core sampler.

[0072] S2, After the core is taken, lift the core tube 3 upward. When the core tube 3 is lifted to a certain height, the valve cover 52 flips up to close with the valve seat 51.

[0073] S3. Remove the core sampler entirely from the borehole and place it on a flat underground surface. Remove the connecting sleeve 11 and connect the drive shaft 41 to the power drive device. The power drive device drives the internal cutter head to rotate, thereby achieving rapid crushing of the coal sample.

[0074] S4. Use tweezers to remove the sealing head 92, attach the gas collecting head 97 to the outer end of the connector 91, connect the gas collecting pipe to the gas collecting docking device 9, and connect the gas collecting pipe to the gas content measuring device; use a wrench to hold the gas collecting head 97, and slowly unscrew the thread of the connector 91 a certain distance (e.g., 1mm) to release the end face seal of the connector 91, so that the airflow channel 911 is connected to the gas collecting hole 971, and measure the gas content through the gas content measuring device.

[0075] Optionally, the gas content measuring device includes a methane flow meter that can read the methane flow rate and cumulative flow in real time.

[0076] S5. Observe the changes in the gas content measuring device until the cumulative measurement value no longer changes significantly within 5 minutes. The obtained gas content is the total gas content of the coal sample.

[0077] Optionally, the specific process of S3 is as follows: the coring device is inverted, with the coring drill bit 6 positioned above, thus ensuring that the coal sample inside the chamber can be concentrated at the drill bit position. Then, the power drive device is activated to drive the transmission shaft 41 to rotate, completing the coal sample crushing.

[0078] In some embodiments, a power drive device with a crushing speed of up to 20,000 RPM is selected, and the coal sample circulation at the crushing point can be achieved by the rotational motion of the blades, that is, heavy coal particles gather at the drill bit, while small coal particles are suspended and move upward.

[0079] The process described in this application is simple to operate and ensures no gas leakage throughout the entire process. It effectively improves the accuracy of gas content measurement and saves operation time and sample transfer time. It is suitable for rapid determination of gas content at multiple locations underground.

[0080] The gas collection docking structure of this application can quickly switch between a sealed state and a gas collection state. The quick switching between sealed and gas collection states can be achieved using only tweezers and a wrench, reducing equipment redundancy.

[0081] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. 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 pressure-maintaining gas collection quick docking structure, characterized by, It comprises: an outer tube (1) with a side hole; a connecting head (91) with a gas flow channel (911) and a positioning groove (912) at its outer end; a sealing head (92) with a positioning protrusion at its inner end; and a gas collecting head (97) with a gas collecting hole (971) and a positioning protrusion at its inner end; the connecting head (91) is threadedly connected with the outer tube (1), and the inner end of the gas flow channel (911) can communicate with the inside of the outer tube (1); the positioning protrusion matches with the positioning groove (912), and the sealing head (92) and the gas collecting head (97) can be selectively mounted at the outer end of the connecting head (91); when the sealing head (92) is mounted at the outer end of the connecting head (91), the sealing head (92) can block the gas flow channel (911) of the connecting head (91); when the gas collecting head (97) is mounted at the outer end of the connecting head (91), the gas flow channel (911) communicates with the gas collecting hole (971).

2. The pressure maintaining gas collection quick docking structure according to claim 1, characterized in that, A filter membrane (13) is mounted at the inner end of the side hole of the outer tube (1).

3. The pressure maintaining gas collection quick docking structure according to claim 1, characterized in that, The side wall of the positioning groove (912) has a lateral groove (913), and the positioning protrusion of the sealing head (92) and the gas collecting head (97) has a lateral protrusion (922) which can be clamped into the lateral groove (913).

4. The pressure maintaining gas collection quick docking structure of claim 1, wherein, The sealing head (92) can be magnetically attracted to the connecting head (91), and / or the gas collecting head (97) can be magnetically attracted to the connecting head (91).

5. The pressure retaining gas collection quick dock structure of any one of claims 1-4, wherein, The side hole of the outer tube (1) is a stepped hole, an end face sealing element (93) is arranged between the inner end of the connecting head (91) and the outer tube (1), and a side sealing element (94) is arranged between the connecting head (91) and the outer tube (1).

6. The pressure holding gas collection quick docking structure of claim 5, wherein, One end of the gas flow channel (911) is opened at the outer end face of the connecting head (91), and the other end of the gas flow channel (911) is opened at the side face of the connecting head (91); the side opening of the gas flow channel (911) is located inside the side sealing element (94).

7. The pressure retaining gas collection quick dock structure of any of claims 1-4, 6, wherein, The side wall of the positioning protrusion of the sealing head (92) is provided with a first sealing element (96), and the side wall of the positioning protrusion of the gas collecting head (97) is provided with a second sealing element (99).

8. The pressure holding gas collection quick docking structure of claim 1, wherein, The outer end face of the sealing head (92) has two rectangular grooves (921).

9. A pressure-maintained coring device for rapid determination of gas content in deep coal mines, characterized in that, It comprises: the pressure-maintaining gas collecting and rapid connecting structure according to any one of claims 1-8; a central rod (2) connected with a core tube (3) at its lower end; a core tube (3) mounted in the outer tube (1); a rock sample breaking mechanism (4) mounted in the core tube (3); a flap valve mounted in the inner part of the lower end of the outer tube (1), and a coring drill bit (6) connected with the lower end of the outer tube (1).

10. The method of using a deep coal mine gas content rapid determination pressure- maintaining corer of claim 9, It is characterized in that, it comprises the following steps: in the initial state, the sealing head (92) is mounted at the outer end of the connecting head (91) to block the gas flow channel (911) of the connecting head (91), and the flap valve is opened; coal samples are obtained by the pressure-maintaining coring device for rapid determination of deep coal mine gas content, and the coal samples are stored in the core tube (3) inside the coring device; after coring is completed, the core tube (3) is lifted upward, and when the core tube (3) is lifted to a certain height, the flap valve is closed; the coring device is taken out from the drill hole, the connecting sleeve (11) is removed, the transmission shaft (41) is connected with a power driving device, and the power driving device drives the cutter inside the core tube (3) to rotate, thereby realizing breaking of the coal samples. The closed head (92) is removed, the gas collecting head (97) is installed on the outer end of the butt joint (91), the gas collecting pipe is connected to the gas collecting butt joint (9), the gas collecting pipe is connected to the gas content measuring device, the gas flow channel (911) is communicated with the gas collecting hole (971), and the gas content is measured through the gas content measuring device.

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