Integrated soil gas detection device

Abstract

This invention relates to the field of soil gas detection technology, providing an integrated soil gas detection device, comprising: an outer sleeve and a central rod; the outer sleeve has a hollow inner cavity and an open end at its lower end; the central rod includes a rod body and a working head, the rod body passing through the outer sleeve and coaxially arranged with it, the end of the rod body protruding from the open end being connected to the working head, the working head being conical, the outer sleeve and the working head being axially slidable relative to each other and circumferentially fixed; wherein, when the detection device is in drilling mode, the working head rotates synchronously under the drive of the outer sleeve; when the detection device is in sampling mode, the working head separates from the outer sleeve, and the working head moves downward relative to the outer sleeve to form an annular gas channel at the ends of the working head and the outer sleeve, so that soil gas can enter the inner cavity from the annular gas channel. This invention achieves rapid, accurate, in-situ, and efficient collection and detection of soil gases.

Description

Technical Field

[0001] This invention relates to the field of soil gas detection technology, and in particular to an integrated soil gas detection device. Background Technology

[0002] Existing soil gas detection devices mostly employ methods such as pre-drilling holes and inserting sampling tubes, or using integrated probes directly pressed or hammered into the ground, collecting gas through side wall openings or top extraction. Inserting sampling tubes after drilling can easily lead to hole wall collapse or gas leakage, affecting detection accuracy. During the insertion of integrated probes, the soil is tightly compacted, hindering gas entry and resulting in low sampling efficiency and poor representativeness. Summary of the Invention

[0003] This invention provides an integrated soil gas detection device to solve the problem of inaccurate soil gas detection caused by pre-drilling holes in the probe rod before insertion or directly pressing it into the soil in the prior art.

[0004] This invention provides an integrated soil gas detection device, comprising: An outer sleeve having a hollow inner cavity and an open end at the lower end; The center rod includes a rod body and a working head. The rod body passes through the outer sleeve and is coaxially arranged with the outer sleeve. One end of the rod body that protrudes from the opening is connected to the working head. The working head is conical. The outer sleeve and the working head can slide relative to each other axially and are circumferentially fixed. When the detection device is in the drilling state, the working head rotates synchronously under the drive of the outer sleeve; When the detection device is in the sampling state, the working head separates from the outer sleeve, and the working head moves downward relative to the outer sleeve to form an annular air passage at the ends of the working head and the outer sleeve, so that soil gas can enter the inner cavity from the annular air passage.

[0005] According to the present invention, an integrated soil gas detection device is provided, wherein the open end has a connection hole; The working head has a connecting part on the side facing the sleeve; when the detection device is in the drilling state, the connecting part is inserted into the connecting hole; When the detection device is in the sampling state, the connecting part separates from the connecting hole.

[0006] According to the present invention, an integrated soil gas detection device is provided, wherein the connecting part includes a connecting post and the connecting hole is a circular hole; The connecting post is inserted into the circular hole.

[0007] According to the present invention, an integrated soil gas detection device is provided, wherein multiple connecting parts and multiple connecting holes are provided, and the multiple connecting holes are arranged circumferentially around the open end of the outer sleeve, and the connecting parts and the connecting holes are arranged one-to-one.

[0008] The integrated soil gas detection device provided by the present invention further includes: a tapping block; When the detection device is in the sampling state, the striking block is located at the end of the central rod away from the working head, and the striking block is used to receive the hammer's impact.

[0009] According to the present invention, an integrated soil gas detection device is provided, wherein the outer sleeve has external threads.

[0010] The integrated soil gas detection device provided by the present invention further includes: a sampling cover and a gas detection component; The sampling cover is located on the end of the outer sleeve opposite to the working head, and the sampling cover is equipped with an extraction tube. The gas detection component is connected to the extraction tube.

[0011] According to an integrated soil gas detection device provided by the present invention, the sampling cover has an internal thread on the side facing the outer sleeve, and the sampling cover is threadedly connected to the outer sleeve.

[0012] The integrated soil gas detection device provided by the present invention further includes: a pull-out component; The pull-out assembly includes a connector and a handle; The connector has a hollow mounting cavity, the inner wall of which has an internal thread, which is threaded to the outer sleeve; the handle is connected to the connector.

[0013] According to an integrated soil gas detection device provided by the present invention, a transparent window is provided on the side wall of the outer sleeve near the working head, and a camera is installed inside the transparent window in the inner cavity; And / or, a humidity detection sensor is installed on the inner wall of the outer sleeve near the working head.

[0014] The integrated soil gas detection device provided by this invention features an outer sleeve and a central rod, with a rod body and a working head mounted on the central rod. The working head is conical, and the rod body passes through the inner cavity of the outer sleeve and connects to the working head at the bottom of the outer sleeve. The outer sleeve and the working head can slide relative to each other axially and are circumferentially fixed. This allows the outer sleeve to drive the working head to rotate and drill during the drilling phase. During the sampling phase, the central rod moves down relative to the outer sleeve by a certain distance, forming an annular air channel between the opening end of the outer sleeve and the working head. Soil gas can enter the inner cavity from the annular air channel and flow to the top of the outer sleeve for detection. This device ensures smooth sampling channels, is easy to operate, and can collect soil gas in situ, achieving rapid, accurate, in-situ, and efficient collection and detection of soil gas. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a front view of the integrated soil gas detection device and electric drill provided by the present invention.

[0017] Figure 2 This is a front view of the central rod provided by the present invention.

[0018] Figure 3 This is a front view of the integrated soil gas detection device and hammer provided by the present invention.

[0019] Figure 4 This is the front view of the working head provided by the present invention.

[0020] Figure 5 This is a top view of the working head provided by the present invention.

[0021] Figure 6 This is one of the front views of the integrated soil gas detection device provided by the present invention.

[0022] Figure 7 This is the second front view of the integrated soil gas detection device provided by the present invention.

[0023] Figure label: 1. Integrated soil gas detection device; 11. Outer sleeve; 12. Center rod; 13. Striking block; 14. Sampling cover; 15. Gas detection assembly; 16. Pull-out assembly; 17. Humidity sensor; 111. Inner cavity; 112. Transparent window; 121. Rod body; 122. Working head; 141. Suction pipe; 161. Connector; 162. Handle; 1221. Connecting part; 2. Electric drill; 3. Hammer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of the present invention and simplifying the description, and do not 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 the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0027] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] The following is combined Figures 1 to 7 The integrated soil gas detection device provided in this invention will be described in detail through specific embodiments and application scenarios.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides an integrated soil gas detection device 1, including: an outer sleeve 11 and a central rod 12.

[0031] The outer sleeve 11 has a hollow inner cavity 111 and an open end at the lower end.

[0032] The center rod 12 includes a rod body 121 and a working head 122. The rod body 121 passes through the outer sleeve 11 and is coaxially arranged with the outer sleeve 11. One end of the rod body 121 that is exposed at the open end is connected to the working head 122. The working head 122 is conical. The outer sleeve 11 and the working head 122 can slide relative to each other axially and are circumferentially fixed.

[0033] When the detection device is in the drilling state, the working head 122 rotates synchronously under the drive of the outer sleeve 11.

[0034] When the detection device is in the sampling state, the working head 122 separates from the outer sleeve 11, and the working head 122 moves downward relative to the outer sleeve 11 to form an annular air passage at the ends of the working head 122 and the outer sleeve 11, so that soil gas can enter the inner cavity 111 from the annular air passage.

[0035] It is understood that the integrated soil gas detection device 1 of this embodiment has a double-layer structure, with the inner central rod 12 being a solid structure and the outer outer sleeve 11 being a hollow structure, and the inner cavity 111 formed on the inner side being used to accommodate the central rod 12.

[0036] The working head 122 is conical, and its pointed tip allows for rapid drilling into the soil to reach the target depth. The working head 122 and the outer sleeve 11 can slide relative to each other axially while remaining circumferentially fixed. When the detection device is in drilling mode, the working head 122 and the outer sleeve 11 are circumferentially fixed, with the open end of the outer sleeve 11 abutting against the working head 122, thus sealing both openings. Rotation of the outer sleeve 11 drives the working head 122 to rotate, and both rotate synchronously, extending into the soil until the preset soil sampling depth is reached. Subsequently, the detection device switches to sampling mode. Due to the relative axial sliding between the working head 122 and the outer sleeve 11, the central rod 12 descends a certain distance relative to the outer sleeve 11 into the deeper soil. The open end of the outer sleeve 11 separates from the working head 122, forming an annular air passage between them. Gas in the soil can enter the inner cavity 111 through this annular air passage. Because a rod 121 is inserted into the inner cavity 111, an annular air passage is also formed in the inner cavity 111. Soil gas flows from the lower part of the outer sleeve 11 to the upper part, reaching the top of the outer sleeve 11. Since the top of the outer sleeve 11 is exposed outside the soil, soil gas can be collected from the top of the outer sleeve 11.

[0037] Specifically, the outer sleeve 11 and the working head 122 can be connected by a spline to achieve relative axial sliding and circumferential fixation, or they can be connected by a pin and a groove to achieve relative axial sliding and circumferential fixation.

[0038] In one example, the outer sleeve 11 of this embodiment is a cylindrical sleeve, the central rod 12 is a cylindrical rod, and the working head 122 is a conical structure. The open end of the cylindrical sleeve and the circular bottom surface of the working head 122 can fit tightly together. The contact area between the outer wall of the cylindrical sleeve and the soil is uniform, and the resistance distribution during rotation is symmetrical, avoiding eccentric torque and reducing the risk of jamming during rotation. Furthermore, since the working head 122 is also a conical structure, the circular bottom surface of the conical structure has the same area as the open end of the cylindrical sleeve. The cylindrical inner cavity 111 provides uniform radial support for the rod 121, ensuring the coaxiality of the rod 121 and the outer sleeve 11. A circular air passage is formed between the cylindrical sleeve and the cylindrical rod, which can ensure a stable flow rate of soil gas and improve sampling efficiency.

[0039] Because the integrated soil gas detection device 1 can first rotate and extend into the soil, and then collect soil gas, it eliminates the need for drilling before insertion, thus avoiding hole wall collapse or gas leakage, and also avoids obstruction of gas entry into the collection channel by drilling and collecting simultaneously. The detection device in this embodiment can quickly, accurately, in situ, and efficiently collect gas in the soil, and detect the gas from the top of the outer sleeve 11.

[0040] The integrated soil gas detection device 1 provided by the present invention comprises an outer sleeve 11 and a central rod 12, with a rod body 121 and a working head 122 on the central rod 12. The working head 122 is conical, and the rod body 121 passes through the inner cavity 111 of the outer sleeve 11 and is connected to the working head 122 at the bottom of the outer sleeve 11. The outer sleeve 11 and the working head 122 can slide relative to each other axially and are circumferentially fixed, so that during the drilling stage, the outer sleeve 11 drives the working head 122 to rotate and drill. During the sampling stage, the central rod 12 moves down a certain distance relative to the outer sleeve 11, forming an annular air channel between the opening end of the outer sleeve 11 and the working head 122. Soil gas can enter the inner cavity 111 from the annular air channel and flow to the top of the outer sleeve 11 for soil gas detection. This device ensures smooth sampling channels, is easy to operate, and can collect soil gas in situ, achieving rapid, accurate, in-situ, and efficient collection and detection of soil gas.

[0041] like Figure 4 and Figure 5 As shown, the open end of this embodiment has a connection hole.

[0042] The working head 122 has a connecting part 1221 on the side facing the sleeve; when the detection device is in the drilling state, the connecting part 1221 is inserted into the connecting hole.

[0043] When the detection device is in the sampling state, the connecting part 1221 separates from the connecting hole.

[0044] Understandably, the connecting part 1221 extends along the axial direction of the outer sleeve 11, and the depth of the connecting hole also extends along the axial direction of the outer sleeve 11. The connecting part 1221, inserted into the connecting hole, limits the circumferential displacement of the outer sleeve 11 relative to the working head 122. Simultaneously, the movement of the connecting part 1221 relative to the connecting hole along the axial direction of the outer sleeve 11 enables axial sliding between the outer sleeve 11 and the working head 122, until the connecting part 1221 is pulled out of the connecting hole, separating from the connecting hole. Because the wall of the connecting hole guides and limits the connecting part 1221, it ensures that the axial sliding direction of the outer sleeve 11 relative to the working head 122 does not deviate or skew.

[0045] Since the connecting hole is located at the bottom of the opening end and the connecting part 1221 is located on the bottom surface of the working head 122, it does not occupy a large installation space. This allows the outer sleeve 11 and the working head 122 to slide relative to each other axially and be fixed circumferentially, thus realizing a small and compact design of the detection device.

[0046] like Figure 4 and Figure 5 As shown, the connecting part 1221 in this embodiment includes a connecting post and a connecting hole that is round; the connecting post is inserted into the round hole.

[0047] Understandably, because the cylindrical surface has consistent curvature along any diameter direction, the cylinder and the circular hole can automatically align themselves during mating, ensuring that the gap in the annular air passage is uniform after the connecting column moves down a certain distance relative to the circular hole. Furthermore, the cylindrical surface slides axially within the circular hole without jamming or uneven wear, making it simple to process and easy to manufacture.

[0048] Specifically, in one example, the diameter of the connecting post is 3 mm, the wall thickness of the outer sleeve 11 is 8 mm, and the diameter of the rod 121 is 12 mm.

[0049] like Figure 4 and Figure 5 As shown, in this embodiment, there are multiple connecting parts 1221 and multiple connecting holes. The multiple connecting holes are arranged circumferentially around the opening end of the outer sleeve 11, and the connecting parts 1221 and the connecting holes are arranged one-to-one.

[0050] Understandably, the circumferential distribution of multiple connecting holes around the opening end ensures a uniform distribution of resistance torque during the rotation of the outer sleeve 11, preventing eccentric forces from causing the outer sleeve 11 to tilt during rotation. Furthermore, the circumferentially distributed connecting holes result in multiple connection points 1221 between the outer sleeve 11 and the working head 122, with structural strength distributed circumferentially, providing full circumferential support for both the outer sleeve 11 and the working head 122. Whether the outer sleeve 11 and the working head 122 are axially sliding or circumferentially fixed, the multiple connecting holes and multiple connection points 1221 effectively achieve circumferential fixation and provide guidance and limiting for axial sliding.

[0051] Specifically, this embodiment has six connecting holes, which are evenly spaced around the opening end of the outer sleeve 11. There are also six connecting portions 1221, which are evenly distributed around the bottom surface of the working head 122 and correspond one-to-one with the six connecting holes.

[0052] like Figure 3 As shown, the integrated soil gas detection device 1 of this embodiment also includes a striking block 13.

[0053] When the detection device is in the sampling state, the striking block 13 is located at the end of the center rod 12 away from the working head 122, and the striking block 13 is used to receive the hammer 3.

[0054] Understandably, in order to maximize the area of ​​the annular air passage formed between the rod 121 and the outer sleeve 11 to collect a sufficient amount of soil gas, the diameter of the rod 121 is set relatively small. When the detection device is in sampling mode, the outer sleeve 11 can be axially slid relative to the working head 122 by striking the end of the rod 121 with the hammer head 3. In this embodiment, a striking block 13 is placed on the rod 121. The outer contour dimension of the striking block 13 is larger than the diameter of the rod 121, and the contact area between the hammer head 3 and the striking block 13 is large, which is beneficial for the hammer head 3 to apply a striking force to the striking block 13, so that the rod 121 can move down a certain distance more quickly.

[0055] Specifically, the striking block 13 in this embodiment is a square block.

[0056] like Figure 1 As shown, the outer sleeve 11 in this embodiment has external threads.

[0057] Understandably, when the detection device is in the drilling state, the integrated soil gas detection device 1 can be drilled into the ground using an electric drill 2. In this embodiment, the outer sleeve 11 has external threads, allowing it to be screwed onto the electric drill 2 to form an integrated structure. After drilling to the desired depth, the electric drill 2 can be screwed in the opposite direction to remove it from the outer sleeve 11. Simultaneously, as the outer sleeve 11 follows the working head 122 to the soil depth, it can discharge soil upwards along the threaded grooves. The thread profile contacts the soil, and rotation generates axial and circumferential forces, transporting soil particles along the helical surface to the borehole opening, reducing soil resistance. Furthermore, the external threads give the outer sleeve 11 self-tapping and self-drilling characteristics, enabling integrated drilling without pre-drilling, simplifying the drilling operation and improving drilling efficiency.

[0058] like Figure 6 As shown, the integrated soil gas detection device 1 of this embodiment also includes: a sampling cover 14 and a gas detection component 15.

[0059] The sampling cover 14 is placed on the end of the outer sleeve 11 away from the working head 122. The sampling cover 14 is equipped with a suction pipe 141, and the gas detection component 15 is connected to the suction pipe 141.

[0060] Understandably, in this embodiment, a gas detection component 15 is connected to the top of the outer sleeve 11, enabling real-time online reading of gas content data. Since the top of the outer sleeve 11 is also an open end, a sampling cover 14 is provided on the top of the outer sleeve 11 to collect soil gas. The sampling cover 14 seals the top of the outer sleeve 11 to prevent soil gas from overflowing, and an extraction pipe 141 is provided on the sampling cover 14. The extraction pipe 141 protrudes from the top surface of the sampling cover 14 and guides the gas accumulated inside the sampling cover 14 into the extraction pipe 141. Connecting the gas detection component 15 to the extraction pipe 141 allows for timely introduction of soil gas into the gas detection component 15, achieving timely collection and guidance of soil gas for accurate detection.

[0061] This embodiment can detect the content of gases such as hydrogen, carbon dioxide, methane, oxygen, and radon.

[0062] like Figure 6 As shown, the sampling cover 14 in this embodiment has an internal thread on the side facing the outer sleeve 11, and the sampling cover 14 is threadedly connected to the outer sleeve 11.

[0063] Understandably, since the outer sleeve 11 has external threads, in order to ensure convenient installation and removal of the outer sleeve 11 and the sampling cover 14, this embodiment provides internal threads on the sampling cover 14. The connection between the outer sleeve 11 and the sampling cover 14 can be achieved through threaded connection, which simplifies the operation steps and saves manpower.

[0064] like Figure 7 As shown, the integrated soil gas detection device 1 of this embodiment also includes: a pull-out component 16.

[0065] The pull-out assembly 16 includes a connector 161 and a handle 162.

[0066] The connector 161 has a hollow mounting cavity with an internal thread on the inner wall of the mounting cavity, which is threaded to the outer sleeve 11; the handle 162 is connected to the connector 161.

[0067] Understandably, after the integrated soil gas detection device 1 has penetrated into the soil and collected soil gases, it needs to be removed from the soil. In this embodiment, a pull-out component 16 is provided at the outer sleeve 11 for quickly removing the detection device.

[0068] Specifically, the pull-out assembly 16 includes a connector 161 and a handle 162. The internal thread of the connector 161 is used for threaded connection with the external thread of the outer sleeve 11 to achieve quick disassembly of the outer sleeve 11 from the connector 161. The handle 162 provides a force application point for the operator, making it easy for the operator to apply pulling force.

[0069] The handle 162 includes a rod connected to the connector 161 and a grip portion perpendicular to the rod. A friction surface can be provided on the grip portion to increase the friction with the hand.

[0070] like Figure 3 As shown, in this embodiment, a transparent window 112 is provided on the side wall of the outer sleeve 11 near the working head 122, and a camera is installed inside the transparent window 112 in the inner cavity 111.

[0071] Understandably, in order to transmit soil data in real time, this embodiment also includes a camera in the inner cavity 111. The camera is small in size and can be integrated inside the outer sleeve 11. The camera can capture soil images and take pictures. In order to ensure that the camera lens can face the soil without obstruction, this embodiment provides a transparent window 112 in the area where the camera is located. The transparent window 112 can physically isolate the camera to prevent the camera from being contaminated or obstructed by the soil, and the transparent window 112 does not block the light transmission between the camera and the soil.

[0072] Specifically, a display or other device can be installed on the outside of the outer sleeve 11, and a connecting wire is provided in the inner cavity 111. The connecting wire runs through the entire length of the outer sleeve 11, with one end connected to a camera and the other end connected to the display, enabling real-time display of soil images.

[0073] like Figure 3 As shown, in this embodiment, a humidity detection sensor 17 is installed on the inner wall of the outer sleeve 11 near the working head 122.

[0074] Understandably, a humidity sensor 17 is also provided at the end of the outer sleeve 11 near the working head 122 to detect the real-time humidity of the soil. This enables the detection device to collect soil gas parameters, image parameters, and humidity information, achieving multi-dimensional soil information collection and improving the efficiency and data reliability of field soil scientific research.

[0075] Specifically, a display or other device can be installed on the outside of the outer sleeve 11, and a connecting wire is provided in the inner cavity 111. The connecting wire runs through the entire length of the outer sleeve 11. One end of the connecting wire is connected to the humidity detection sensor 17, and the other end is connected to the display, which can display the soil humidity in real time.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated soil gas detection device, characterized in that, include: An outer sleeve having a hollow inner cavity and an open end at the lower end; The center rod includes a rod body and a working head. The rod body passes through the outer sleeve and is coaxially arranged with the outer sleeve. One end of the rod body that protrudes from the opening is connected to the working head. The working head is conical. The outer sleeve and the working head can slide relative to each other axially and are circumferentially fixed. When the detection device is in the drilling state, the working head rotates synchronously under the drive of the outer sleeve; When the detection device is in the sampling state, the working head separates from the outer sleeve, and the working head moves downward relative to the outer sleeve to form an annular air passage at the ends of the working head and the outer sleeve, so that soil gas can enter the inner cavity from the annular air passage.

2. The integrated soil gas detection device according to claim 1, characterized in that, The open end has a connection hole; The working head has a connecting part on the side facing the sleeve; when the detection device is in the drilling state, the connecting part is inserted into the connecting hole; When the detection device is in the sampling state, the connecting part separates from the connecting hole.

3. The integrated soil gas detection device according to claim 2, characterized in that, The connecting part includes a connecting post, and the connecting hole is a round hole; The connecting post is inserted into the circular hole.

4. The integrated soil gas detection device according to claim 2, characterized in that, Both the connecting part and the connecting hole are provided in multiple ways. The multiple connecting holes are arranged circumferentially around the open end of the outer sleeve, and the connecting part and the connecting hole are arranged in a one-to-one correspondence.

5. The integrated soil gas detection device according to claim 1, characterized in that, Also includes: Tap the block; When the detection device is in the sampling state, the striking block is located at the end of the central rod away from the working head, and the striking block is used to receive the hammer's impact.

6. The integrated soil gas detection device according to claim 1, characterized in that, The outer sleeve has external threads.

7. The integrated soil gas detection device according to claim 6, characterized in that, Also includes: Sampling cap and gas detection assembly; The sampling cover is located on the end of the outer sleeve opposite to the working head, and the sampling cover is equipped with an extraction tube. The gas detection component is connected to the extraction tube.

8. The integrated soil gas detection device according to claim 7, characterized in that, The sampling cap has an internal thread on the side facing the outer sleeve, and the sampling cap is threadedly connected to the outer sleeve.

9. The integrated soil gas detection device according to claim 6, characterized in that, Also includes: Remove the component; The pull-out assembly includes a connector and a handle; The connector has a hollow mounting cavity, the inner wall of which has an internal thread, which is threaded to the outer sleeve; the handle is connected to the connector.

10. The integrated soil gas detection device according to any one of claims 1 to 9, characterized in that, A transparent window is provided on the side wall of the outer sleeve near the working head, and a camera is installed inside the transparent window in the inner cavity; And / or, a humidity detection sensor is installed on the inner wall of the outer sleeve near the working head.

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