A docking device for a pressure-maintaining and gas-maintaining core drill and a gas analysis system

Abstract

The present invention discloses a docking device for a pressure-maintaining gas corer and a gas analysis system, comprising: a rotating rod; an annular sleeve, the annular sleeve is sleeved on the outside of the pressure-maintaining tube of the corer and is sealed with the pressure-maintaining tube; the pressure-maintaining tube is provided with a threaded hole, and the threaded hole is provided with a pipe thread screw connected to the threaded hole; the annular sleeve is provided with a first through hole and a second through hole radially opposite each other; and a first annular groove is provided on the inner surface of the annular sleeve, the first annular groove connects the first through hole and the second through hole; the rotating rod is sealed with the first through hole, the rotating rod passes through the first through hole and is connected to the pipe thread screw, and the second through hole is used to connect to the gas analysis system. Since the annular sleeve is sealed with the pressure-maintaining tube and the rotating rod is sealed with the first through hole, the gas entering the first annular groove can only enter the gas analysis system through the second through hole, so that the gas content can be accurately measured.

Description

Technical Field

[0001] The present invention relates to the technical field of coring, and in particular to a docking device for a pressure-maintaining and gas-maintaining coring device and a gas analysis system. Background Art

[0002] Coal mine gas (CMG) is primarily composed of methane, along with certain amounts of nitrogen, oxygen, water, and carbon dioxide. Methane is the most valuable of these gases. my country, a major coal producer and depositor, possesses abundant CMG reserves. Developing and utilizing CMG to provide clean energy is a fundamental national energy strategy.

[0003] In the existing technology, after the core of the gas-containing coal seam is taken to the surface through a pressure-maintaining gas corer, the core is directly taken out from the corer and then placed in a gas testing system to detect the gas content. Since this process will cause the core to come into contact with the external air, the gas will be lost, resulting in a significant reduction in the measured gas content, making it impossible to accurately measure the gas resource content of the coal seam formation.

[0004] Therefore, the existing technology needs to be improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that, in response to the above-mentioned defects of the prior art, a docking device for a pressure-maintaining and gas-maintaining core driller and a gas analysis system is provided, aiming to solve the technical problem in the prior art of directly taking the core out of the core driller and placing it into the gas analysis system, resulting in the inability to accurately measure the gas resource content in the core.

[0006] The present invention provides a docking device for a pressure-maintaining gas core drill and a gas analysis system. The pressure-maintaining gas core drill has a threaded hole provided on a pressure-maintaining tube, and a pipe thread screw connected to the threaded hole is provided in the threaded hole. The docking device comprises:

[0007] Rotating rod;

[0008] an annular sleeve, the annular sleeve being sleeved outside the pressure-maintaining tube of the core remover and being sealedly connected to the pressure-maintaining tube;

[0009] The annular sleeve is provided with:

[0010] A first through hole and a second through hole that are radially opposite to each other;

[0011] a first annular groove, the first annular groove being provided on the inner surface of the annular sleeve and communicating with the first through hole and the second through hole;

[0012] The rotating rod is sealed and connected to the first through hole, the rotating rod passes through the first through hole and is connected to the pipe thread screw, and the second through hole is used to connect to the methane gas analysis system.

[0013] Furthermore, the rotating rod includes:

[0014] A rotating rod body and a first connecting portion and a second connecting portion provided at two ends of the rotating rod body;

[0015] Wherein, the rotating rod body is sealed and connected to the first through hole, and the second connecting portion is connected to the pipe thread screw.

[0016] Furthermore, the docking device further includes:

[0017] A handle is connected to the first connecting portion.

[0018] Furthermore, the first connecting portion is a first polygonal rod, the handle is provided with a third through hole matching the first polygonal rod, and the first polygonal rod is provided in the third through hole;

[0019] The second connecting portion is a second polygonal rod, the head of the pipe thread screw is provided with a slot matching the second polygonal rod, and the second polygonal rod is arranged in the slot.

[0020] Furthermore, the first polygonal rod and the second polygonal rod are both hexagonal rods, the third through hole is a hexagonal hole, and the slot is a hexagonal slot.

[0021] The rotating rod is also provided with:

[0022] A limiting member is used to prevent the second connecting portion from being separated from the first annular groove.

[0023] Furthermore, the limiting member is a convex ring, and the convex ring is provided between the rotating rod body and the second connecting portion;

[0024] The convex ring is located in the first annular groove, and the diameter of the convex ring and the width of the first annular groove are both greater than the diameter of the first through hole.

[0025] Furthermore, the rotating rod body is provided with at least one second annular groove, and a second sealing ring is provided in each of the second annular grooves.

[0026] Furthermore, the inner surface of the annular sleeve is further provided with a third annular groove and a fourth annular groove, and the third annular groove and the fourth annular groove are respectively located on opposite sides of the first annular groove;

[0027] Wherein, a third sealing ring is provided in the third annular groove, and a fourth sealing ring is provided in the fourth annular groove.

[0028] Furthermore, between the second through hole and the gas analysis system is provided:

[0029] An exhaust connector, wherein the first end of the exhaust connector is connected to the second through hole, the second end of the exhaust connector is connected to an exhaust pipe, and the exhaust pipe is connected to the gas analysis system.

[0030] Beneficial effect: The present invention provides a docking device between a pressure-maintaining gas core driller and a gas analysis system, characterized in that the docking device comprises: a rotating rod; an annular sleeve, the annular sleeve is sleeved on the outside of the pressure-maintaining tube of the core driller and is sealed with the pressure-maintaining tube; wherein, a threaded hole is provided on the pressure-maintaining tube, and a pipe threaded screw connected to the threaded hole is provided in the threaded hole; the annular sleeve is provided with: a first through hole and a second through hole radially opposite each other; and a first annular groove is provided on the inner surface of the annular sleeve, the first annular groove connects the first through hole and the second through hole; wherein, the rotating rod is sealed with the first through hole, the rotating rod passes through the first through hole and is connected to the pipe threaded screw, and the second through hole is used to connect the gas analysis system. In this application, by rotating the rotating rod, the rotating rod drives the pipe threaded screw to rotate, opening the threaded hole on the pressure maintaining tube, so that the gas enters the first annular groove from the threaded hole on the pressure maintaining tube. Since the annular sleeve is sealed to the pressure maintaining tube and the rotating rod is sealed to the first through hole, the gas entering the first annular groove can only enter the gas analysis system through the second through hole, thereby accurately measuring the gas content. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0032] The drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and, together with the specification, are used to illustrate the technical solutions of the present application.

[0033] Figure 1 This is a schematic diagram of the overall structure of a docking device for a pressure-maintaining gas core drill and a gas analysis system in this application;

[0034] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0035] Figure 3This is a schematic diagram of the overall structure of an annular sleeve in a docking device for a pressure-maintaining gas core drill and a gas analysis system in this application;

[0036] Figure 4 This is a schematic diagram of the overall structure of a rotating rod in a docking device for a pressure-maintaining gas core drill and a gas analysis system in the present application;

[0037] Figure 5 This is a first structural schematic diagram of a handle in a docking device for a pressure-maintaining gas core drill and a gas analysis system according to the present application;

[0038] Figure 6 This is a second structural schematic diagram of a handle in a docking device for a pressure-maintaining and gas-maintaining core drill and a gas analysis system according to the present application.

[0039] Figure markings: 100, rotating rod; 110, rotating rod body; 120, first connecting part; 130, second connecting part; 140, convex ring; 150, second annular groove; 160, second sealing ring; 200, annular sleeve; 210, first through hole; 220, second through hole; 230, first annular groove; 240, third annular groove; 250, third sealing ring; 260, fourth annular groove; 270, fourth sealing ring; 300, handle; 310, third through hole; 400, pressure maintaining tube; 420, pipe thread screw; 500, core tube; 510, opening; 600, core; 700, exhaust joint; 800, exhaust pipe. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions and advantages of this application clearer and more explicit, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0041] In the description of the application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0043] In the application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] After the existing pressure-maintaining and gas-maintaining corer brings the gas-containing coal seam core to the surface, the core is directly taken out from the corer and then placed into the gas testing system to detect the gas content. Since this process will cause the core to come into contact with the external air, the gas will be lost, resulting in a significant reduction in the measured gas content, making it impossible to accurately measure the gas resource content of the coal seam formation.

[0045] Based on this, the present application provides a docking device between a pressure-maintaining gas core driller and a gas analysis system, wherein a threaded hole is provided on the pressure-maintaining tube 400 of the pressure-maintaining gas core driller, and a pipe threaded screw 420 connected to the threaded hole is provided in the threaded hole; the docking device includes: a rotating rod 100; an annular sleeve 200, the annular sleeve 200 is sleeved on the outside of the pressure-maintaining tube 400 of the core driller and is sealed with the pressure-maintaining tube 400; the annular sleeve 200 is provided with: a first through hole 210 and a second through hole 220 radially opposite each other; and a first annular groove 230 is provided on the inner surface of the annular sleeve 200, the first annular groove 230 connects the first through hole 210 and the second through hole 220; wherein, the rotating rod 100 is sealedly connected to the first through hole 210, the rotating rod 100 passes through the first through hole 210 and is connected to the pipe threaded screw 420, and the second through hole 220 is used to connect the gas analysis system.

[0046] like Figures 1 to 6 As shown, the pressure-maintaining gas coring device includes a core tube 500 containing a core 600 and a pressure-maintaining tube 400 arranged on the outside of the core tube 500. An opening 510 is provided on the core tube 500. The threaded hole on the pressure-maintaining tube 400 is provided at a corresponding position of the opening 510 of the core tube 500 (generally provided near the opening 510 of the core tube 500). The threaded hole on the pressure-maintaining tube 400 is connected by a pipe threaded screw 420 to seal the gas. When the docking device is not connected, the threaded hole is blocked by the pipe threaded screw 420 so that the gas will not diffuse into the external air through the threaded hole.

[0047] like Figure 3 As shown, the annular sleeve 200 is sleeved over the pressure-maintaining tube 400 and is sealed therewith. That is, the inner surface of the annular sleeve 200 is sealed therewith. A first through hole 210 and a second through hole 220 are formed in the annular sleeve 200 in a radially opposed relationship. Furthermore, a first annular groove 230 is formed on the inner surface of the annular sleeve 200, which connects the first through hole 210 and the second through hole 220.

[0048] Specifically, the first through hole 210 needs to be arranged directly above the threaded hole, and the first through hole 210 and the threaded hole are coaxially arranged so that the rotating rod 100 passes through the first through hole 210 and is connected to the pipe thread screw 420 .

[0049] Preferably, since the rotating rod 100 needs to rotate relative to the first through hole 210 during the rotation process, in this embodiment, the rotating rod 100 is configured to be cylindrical and the first through hole 210 is a cylindrical hole to facilitate the rotation of the rotating rod 100 in the cylindrical hole.

[0050] In this embodiment, by rotating the rotating rod 100, the rotating rod 100 drives the pipe thread screw 420 to rotate, opening the threaded hole on the pressure maintaining tube 400, so that the gas enters the first annular groove 230 from the threaded hole on the pressure maintaining tube 400.

[0051] It is worth noting that since the annular sleeve 200 is sealedly connected to the pressure-maintaining tube 400, the gas in the first annular groove 230 is prevented from leaking to the outside air through the gap between the inner surface of the annular sleeve 200 and the outer surface of the pressure-maintaining tube 400; since the rotating rod 100 is sealedly connected to the first through hole 210, the gas is prevented from leaking to the outside air through the first through hole 210 during the rotation of the rotating rod 100, so that the gas entering the first annular groove 230 can only enter the gas analysis system through the second through hole 220, thereby enabling the accurate measurement of the gas content.

[0052] On the basis of the above embodiment, in order to facilitate the operation and rotation of the rotating rod 100, the rotating rod 100 includes: a rotating rod body 110 and a first connecting part 120 and a second connecting part 130 provided at both ends of the rotating rod body 110; wherein, the rotating rod body 110 is sealedly connected to the first through hole 210, the second connecting part 130 is connected to the pipe threaded screw 420, and the docking device also includes: a handle 300, and the handle 300 is connected to the first connecting part 120.

[0053] like Figure 4As shown, the rotating rod 100 includes a rotating rod body 110, a first connecting portion 120, and a second connecting portion 130. Specifically, the first connecting portion 120 is located at the upper end of the rotating rod body 110, and the second connecting portion 130 is located at the lower end of the rotating rod body 110. Preferably, the rotating rod body 110, the first connecting portion 120, and the second connecting portion 130 are integrally formed.

[0054] The rotating rod body 110 is cylindrical, which facilitates a sealed connection with the first through hole 210 and facilitates rotation within the first through hole 210 .

[0055] The first connection portion 120 is connected to the handle 300 , and the rotating rod 100 can be driven to rotate by rotating the handle 300 .

[0056] Specifically, the first connecting portion 120 and the handle 300 can be connected in a detachable manner or by welding. The shape of the handle 300 can be various, and those skilled in the art can set it according to actual needs.

[0057] like Figure 5~Figure 6 As shown, in a preferred setting, the handle 300 is disc-shaped to facilitate operation and torque transmission by the staff.

[0058] The second connection portion 130 is connected to the pipe thread screw 420 . By rotating the handle 300 to drive the rotating rod 100 to rotate, the second connection portion 130 drives the pipe thread screw 420 to rotate, thereby unscrewing the pipe thread screw 420 .

[0059] Specifically, in this embodiment, the second connection portion 130 is generally connected to the head of the pipe thread screw 420 in a detachable or welded manner, thereby driving the pipe thread screw 420 to rotate.

[0060] On the basis of the above embodiment, the first connecting portion 120 is a first polygonal rod, the handle 300 is provided with a third through hole 310 matching the first polygonal rod, and the first polygonal rod is provided in the third through hole 310 .

[0061] Specifically, the first polygonal rod can be a quadrilateral rod, a pentagonal rod, a hexagonal rod, etc. When the first polygonal rod is a quadrilateral rod, the third through-hole 310 is a matching square hole, facilitating installation of the quadrilateral rod within the square hole and transmission of torque and rotational speed via the disc-shaped handle 300. When the first polygonal rod is a hexagonal rod, the third through-hole 310 is a matching hexagonal hole, facilitating installation of the hexagonal rod within the hexagonal hole and transmission of torque and rotational speed via the disc-shaped handle 300.

[0062] On the basis of the above embodiment, the second connecting portion 130 is a second polygonal rod, the head of the pipe thread screw 420 is provided with a slot matching the second polygonal rod, and the second polygonal rod is arranged in the slot.

[0063] Specifically, the second polygonal rod can be a quadrilateral rod, a pentagonal rod, a hexagonal rod, etc. When the second polygonal rod is a quadrilateral rod, the slot is an inner quadrilateral slot that matches it, which is convenient for the quadrilateral rod to be installed in the inner quadrilateral slot. When the second polygonal rod is a hexagonal rod, the slot is an inner hexagonal slot that matches it, which is convenient for the hexagonal rod to be installed in the inner hexagonal slot.

[0064] like Figure 4 and Figure 6 As shown, preferably, considering that when the polygonal rod has a large number of sides, the handle 300 is prone to slipping during the rotation of the first connecting part 120, and the second connecting part 130 is prone to slipping during the rotation of the pipe threaded screw 420, therefore, in this embodiment, the first polygonal rod and the second polygonal rod are both hexagonal rods, the third through hole 310 is a hexagonal hole, and the slot is a hexagonal slot.

[0065] On the basis of the above embodiment, the rotating rod 100 is further provided with a limiting member, which is used to prevent the second connecting portion 130 from being separated from the first annular groove 230 .

[0066] Since the glutamic acid threaded screw is unscrewed by the second connecting portion 130 of the rotating rod 100, in order to prevent the internal pressure of the core tube 500 from being too high and rushing the rotating rod 100 out of the first through hole 210, causing the gas to be lost, the rotating rod 100 is also provided with a device for preventing the second connecting portion 130 from detaching from the first annular groove 230 under the impact of the internal pressure of the core tube 500 and rushing out of the first through hole 210, causing the gas to be lost.

[0067] Based on the above embodiment, there are multiple ways to set the limit member. In a preferred implementation, the limit member is a convex ring 140, and the convex ring 140 is arranged between the rotating rod body 110 and the second connecting part 130; wherein, the convex ring 140 is located in the first annular groove 230, and the diameter of the convex ring 140 and the width of the first annular groove 230 are both greater than the diameter of the first through hole 210.

[0068] like Figure 4As shown, in this embodiment, a convex ring 140 is provided between the rotating rod body 110 and the second connecting portion 130 (the end of the second connecting portion 130 close to the rotating rod body 110). Since the convex ring 140 is located in the first annular groove 230, the diameter of the convex ring 140 and the width of the first annular groove 230 are both greater than the diameter of the first through hole 210. When the pipe thread screw 420 is unscrewed, due to the blocking effect of the convex ring 140, the rotating rod 100 will not rush out of the outside through the first through hole 210 due to excessive pressure in the core barrel 500.

[0069] Preferably, the convex ring 140 is integrally formed with the rotating rod body 110 and the second connecting portion 130 .

[0070] It is worth noting that in other embodiments, the limiter may also be of other shapes (for example, a square) or be arranged at other positions of the rotating rod 100 (near the connection between the rotating rod body 110 and the second connecting portion 130), and those skilled in the art may set it according to actual usage requirements.

[0071] On the basis of the above embodiment, the rotating rod body 110 is provided with at least one second annular groove 150 , and a second sealing ring 160 is provided in each of the second annular grooves 150 .

[0072] like Figure 1 、 Figure 2 and Figure 4 As shown, in order to achieve a sealed connection between the rotating rod body 110 and the first through hole 210, at least one second annular groove 150 is provided on the rotating rod body 110, and a second sealing ring 160 matching it is provided in the second annular groove 150, so that the rotating rod 100 can avoid gas leakage to the outside air through the first through hole 210 during the rotation process.

[0073] Furthermore, in this embodiment, two second annular grooves 150 are provided to achieve a better sealing effect.

[0074] As another way to achieve a sealed connection between the rotating rod body 110 and the first through hole 210, the outer surface of the rotating rod body 110 is provided with an external thread, and the first through hole 210 is provided with an internal thread, and the two are sealed by threaded connection.

[0075] On the basis of the above embodiment, in order to achieve a sealed connection between the annular sleeve 200 and the pressure-maintaining tube 400, the inner surface of the annular sleeve 200 is further provided with a third annular groove 240 and a fourth annular groove 260, and the third annular groove 240 and the fourth annular groove 260 are respectively located on opposite sides of the first annular groove 230; wherein, a third sealing ring 250 is provided in the third annular groove 240, and a fourth sealing ring 270 is provided in the fourth annular groove 260.

[0076] like Figures 1 to 3 As shown, when the pipe thread screw 420 is unscrewed, gas enters the first annular groove 230. To prevent the gas in the first annular groove 230 from leaking into the outside air through the gap between the inner surface of the annular sleeve 200 and the outer surface of the pressure-maintaining tube 400, in this embodiment, the inner surface of the annular sleeve 200 is further provided with a third annular groove 240 and a fourth annular groove 260. The third annular groove 240 and the fourth annular groove 260 are respectively located on the left and right sides of the first annular groove 230 in the axial direction. A matching third sealing ring 250 is provided in the third annular groove 240, and a matching fourth sealing ring 270 is provided in the fourth annular groove 260. This achieves a sealed connection between the annular sleeve 200 and the pressure-maintaining tube 400.

[0077] As another way to achieve a sealed connection between the annular sleeve 200 and the pressure-maintaining tube 400, the outer surface of the pressure-maintaining tube 400 is provided with an external thread, and the annular sleeve 200 is provided with an internal thread, and the two are sealed together by threaded connection.

[0078] On the basis of the above embodiment, an exhaust connector 700 is provided between the second through hole 220 and the gas analysis system, the first end of the exhaust connector 700 is connected to the second through hole 220, the second end of the exhaust connector 700 is connected to an exhaust pipe 800, and the exhaust pipe 800 is connected to the gas analysis system.

[0079] Specifically, in a preferred embodiment, the second through hole 220 is a threaded hole, and the first end of the gas extraction connector 700 is sealedly connected to the second through hole 220 via threads to prevent gas leakage to the outside air. Furthermore, the connection between the second end of the gas extraction connector 700 and the gas extraction pipe 800, as well as the connection between the gas extraction pipe 800 and the gas analysis system, can also be sealed via threads.

[0080] In summary, the present invention provides a docking device between a pressure-maintaining gas core driller and a gas analysis system, the docking device comprising: a rotating rod; an annular sleeve, the annular sleeve being sleeved on the outside of the pressure-maintaining tube of the core driller and being sealed and connected to the pressure-maintaining tube; wherein, a threaded hole is provided on the pressure-maintaining tube, and a pipe threaded screw connected to the threaded hole is provided in the threaded hole; the annular sleeve is provided with: a first through hole and a second through hole radially opposite each other; and a first annular groove is provided on the inner surface of the annular sleeve, the annular groove connecting the first through hole and the second through hole; wherein, the rotating rod is sealed and connected to the first through hole, the rotating rod passes through the first through hole and is connected to the pipe threaded screw, and the second through hole is used to connect the gas analysis system. In this application, by rotating the rotating rod, the rotating rod drives the pipe threaded screw to rotate, opening the threaded hole on the pressure maintaining tube, so that the gas enters the annular groove from the threaded hole on the pressure maintaining tube. Since the annular sleeve is sealed to the pressure maintaining tube and the rotating rod is sealed to the first through hole, the gas entering the annular groove can only enter the gas analysis system through the second through hole, thereby accurately measuring the gas content.

[0081] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A docking device for a pressure-maintaining gas core drill and a gas analysis system, wherein a threaded hole is provided on the pressure-maintaining tube of the pressure-maintaining gas core drill, and a pipe thread screw connected to the threaded hole is provided in the threaded hole; characterized in that: The docking device comprises: A rotating rod, comprising a rotating rod body and a first connecting portion and a second connecting portion provided at two ends of the rotating rod body; An annular sleeve, the annular sleeve is sleeved outside the pressure-maintaining tube of the pressure-maintaining and gas-maintaining corer and is sealed and connected to the pressure-maintaining tube; The annular sleeve is provided with: A first through hole and a second through hole that are radially opposite to each other; a first annular groove, the first annular groove being provided on the inner surface of the annular sleeve, the first annular groove being connected to the first through hole and the second through hole; The rotating rod is sealed and connected to the first through hole, passes through the first through hole and is connected to the pipe thread screw, and the second through hole is used to connect to the gas analysis system; the rotating rod body is sealed and connected to the first through hole, and the second connecting portion is connected to the pipe thread screw; The inner surface of the annular sleeve is further provided with a third annular groove and a fourth annular groove, wherein the third annular groove and the fourth annular groove are respectively located on opposite sides of the first annular groove; Wherein, a third sealing ring is provided in the third annular groove, and a fourth sealing ring is provided in the fourth annular groove.

2. The docking device for the pressure-maintaining gas core drill and the gas analysis system according to claim 1, characterized in that: The docking device also includes: A handle is connected to the first connecting portion.

3. The docking device for the pressure-maintaining gas core drill and the gas analysis system according to claim 2, characterized in that: The first connecting portion is a first polygonal rod, the handle is provided with a third through hole matching the first polygonal rod, and the first polygonal rod is provided in the third through hole; The second connecting portion is a second polygonal rod, the head of the pipe thread screw is provided with a slot matching the second polygonal rod, and the second polygonal rod is arranged in the slot.

4. The docking device for the pressure-maintaining gas core drill and the gas analysis system according to claim 3, characterized in that: The first polygonal rod and the second polygonal rod are both hexagonal rods, the third through hole is a hexagonal hole, and the slot is a hexagonal slot.

5. The docking device for the pressure-maintaining gas core drill and the gas analysis system according to claim 1, characterized in that: The rotating rod is also provided with: A limiting member is used to prevent the second connecting portion from being separated from the first annular groove.

6. The docking device for the pressure-maintaining gas core drill and the gas analysis system according to claim 5, characterized in that: The limiting member is a convex ring, and the convex ring is arranged between the rotating rod body and the second connecting portion; The convex ring is located in the first annular groove, and the diameter of the convex ring and the width of the first annular groove are both greater than the diameter of the first through hole.

7. The docking device for the pressure-maintaining gas core drill and the gas analysis system according to claim 1, characterized in that: The rotating rod body is provided with at least one second annular groove, and a second sealing ring is provided in each of the second annular grooves.

8. The docking device for a pressure-maintaining gas core drill and a gas analysis system according to any one of claims 1 to 7, characterized in that: Between the second through hole and the gas analysis system is provided: An exhaust connector, wherein the first end of the exhaust connector is connected to the second through hole, the second end of the exhaust connector is connected to an exhaust pipe, and the exhaust pipe is connected to the gas analysis system.

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