A smart gas concentration detection device

Abstract

This invention relates to the field of gas detection technology and discloses an intelligent gas concentration detection device, including a detection box with a gas chamber inside. The gas to be tested is delivered into the gas chamber, and a detection mechanism is installed inside the gas chamber. An adjustment mechanism is also installed inside the gas chamber to isolate and expel air from the gas chamber before the gas to be tested is introduced. By setting up the adjustment mechanism, this invention isolates and expels air at the detection position inside the gas chamber before the gas to be tested enters for detection, thus reducing the dilution of the gas to be tested by air during the detection process.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically to an intelligent gas concentration detection device. Background Technology

[0002] Gas concentration detection is widely used in hazardous locations where flammable, explosive, and toxic gases are present, such as in the gas, petroleum, chemical, and metallurgical industries. Concentration, expressed as the mass of pollutants per cubic meter of air, is called mass, and the unit is milligrams per cubic meter (mg / m³) or grams per cubic meter (g / m³).

[0003] For example, patent CN216847585U, published on June 28, 2022, discloses a mixed gas sealed cavity and detection device for multi-gas concentration detection, relating to the field of gas environment testing technology. It includes: a housing forming a sealed cavity; a heating element disposed at the bottom of the sealed cavity; a built-in fan disposed within the sealed cavity for mixing gases; a vacuum gauge disposed on the housing for measuring the gas pressure within the sealed cavity; and a gas detection module disposed within the sealed cavity for detecting the gas concentration within the sealed cavity.

[0004] In existing concentration detection processes, many gas concentrations require extremely high sensitivity (e.g., ppm or ppb levels). In open environments, airflow, humidity, and temperature changes can interfere with measurements, while closed environments can eliminate these variables. Therefore, in some gas concentration detection processes, the gas to be tested needs to be injected into a closed chamber for detection. However, during the gas injection process, because there is a certain amount of air in the chamber, the gas to be tested mixes with the existing air in the chamber, causing the gas to be diluted within the chamber and thus affecting the detection results. Summary of the Invention

[0005] The purpose of this invention is to provide an intelligent gas concentration detection device to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intelligent gas concentration detection device, comprising a detection box, a gas chamber being formed inside the detection box, a detection mechanism being installed inside the gas chamber, and an adjustment mechanism being installed inside the gas chamber, the adjustment mechanism being used to isolate and discharge the air inside the gas chamber before the gas to be tested is input.

[0007] Preferably, the adjusting mechanism includes a piston plate installed inside the air chamber. The piston plate is horizontally arranged and dynamically sealed to the inner wall of the detection chamber. The piston plate is driven to move up and down inside the air chamber.

[0008] Preferably, the piston plate divides the gas chamber into a first chamber and a second chamber, with the first chamber located below the second chamber.

[0009] Preferably, the adjustment mechanism further includes a drive assembly, which is installed in the second chamber and connected to the piston plate.

[0010] Preferably, the piston plate has a first position and a second position. When the piston plate is in the first position, the detection mechanism is located in the second chamber. When the piston plate is in the second position, the detection probe of the detection mechanism extends into the first chamber.

[0011] Preferably, a hole is provided at the center of the piston plate, and a switching mechanism is installed inside the hole. The switching mechanism is used to open and close the bottom opening of the hole. When the piston plate is in the second position, the detection probe of the detection mechanism extends into the hole, and at the same time, the switching mechanism opens the bottom opening of the hole.

[0012] Preferably, a support plate is mounted on the upper surface of the piston plate, the drive assembly is connected to the piston plate through the support plate, a locking mechanism is installed between the support plate and the piston plate, and the switching mechanism includes a first rack and a second rack. The upper end of the first rack is connected to the support plate, and the lower end extends into the interior of the piston plate. A sealing plug is installed inside the hole. The sealing plug has a frustum-shaped structure. The lower end of the second rack is connected to the sealing plug. A gear is rotatably mounted inside the piston plate. The gear is located between the first rack and the second rack and meshes with the first rack and the second rack.

[0013] Preferably, the piston plate has an internal receiving groove, and the first rack, the gear and the second gear are all located inside the receiving groove, with the first rack and the second rack forming a limiting contact engagement with the receiving groove.

[0014] Preferably, the first rack consists of a blank section and an engaging section, with the blank section located above the engaging section.

[0015] Preferably, the locking mechanism includes a first wedge and a second wedge. The upper surface of the piston plate has a groove, and the lower surface of the support plate has a protrusion. The protrusion is located in the groove and forms a limiting contact fit with the groove. The locking mechanism includes a first wedge, a locking block, and a second wedge. The connecting block also has a limiting groove. The first wedge, the locking block, and the second wedge are all installed inside the limiting groove. The first wedge and the locking block are arranged horizontally, and the second wedge is arranged vertically. The first wedge and the second wedge form a wedge fit. One end of the locking block is fixedly connected to the first wedge, and the other end extends out from the inner opening of the limiting groove and enters the groove. The outer wall of the protrusion has a locking groove. The locking block and the locking groove form a limiting contact fit. A limiting plate is fixedly installed on the inner wall of the detection box.

[0016] The beneficial effects of the present invention are as follows: In the above technical solution, the present invention, through the setting of the adjustment mechanism, isolates and discharges the air at the detection position in the gas chamber before the gas to be tested enters the gas chamber for detection, thereby reducing the situation where the gas to be tested is diluted by air during the detection process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the structure provided for an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal cross-sectional structure provided in an embodiment of the present invention;

[0020] Figure 3 Provided for embodiments of the present invention Figure 2 Enlarged view of point A in the image;

[0021] Figure 4 Provided for embodiments of the present invention Figure 2 A magnified structural diagram at point B in the diagram.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Detection box; 11. Air chamber; 111. First chamber; 112. Second chamber; 2. Adjustment mechanism; 21. Piston plate; 22. Drive assembly; 3. Detection mechanism; 31. Detection probe; 4. Support plate; 5. Switching mechanism; 51. First rack; 511. Blank section; 512. Meshing section; 52. Second rack; 53. Gear; 54. Sealing plug; 55. Hole; 56. Receiving groove; 6. Locking mechanism; 61. First wedge; 62. Second wedge; 63. Locking block; 64. Protrusion; 65. Limiting groove; 66. Limiting plate; 67. Groove. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be 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 this invention based on the specific circumstances.

[0026] like Figure 1-4 As shown, this embodiment of the invention provides an intelligent gas concentration detection device, including a detection box 1, a gas chamber 11 is opened in the detection box 1, the gas to be tested is transported into the gas chamber 11, a detection mechanism 3 is installed in the gas chamber 11, and an adjustment mechanism 2 is also installed in the gas chamber 11. The adjustment mechanism 2 is used to isolate and discharge the air in the gas chamber 11 from the inside before the gas to be tested is input.

[0027] Specifically, the detection box 1 is a hollow cylindrical structure arranged vertically. The bottom of the detection box 1 has an air inlet that is connected to the gas chamber 11. The gas to be tested enters the gas chamber 11 through the air inlet. The air inlet is connected to an external gas delivery mechanism through a pipe. The gas delivery mechanism is used to deliver and send external gas. The detection probe 31 of the detection mechanism 3 is installed inside the gas chamber 11. The detection mechanism 3 is a concentration sensor. The concentration sensor is existing technology and will not be described in detail. The adjustment mechanism 2 includes a piston plate 21 installed inside the gas chamber 11. The piston plate 21 is arranged horizontally and is dynamically sealed to the inner wall of the detection box 1. The piston plate 21 is driven to move up and down inside the gas chamber 11. The piston plate 21 divides the gas chamber 11 into a first chamber 111 and a second chamber 112. The first chamber 111 is located below the second chamber 112.

[0028] In the initial state, that is, before the gas to be tested is delivered, the piston plate 21 is located at the bottom of the gas chamber 11. At this time, the space of the first chamber 111 is squeezed out by the piston plate 21, and the space of the second chamber 112 is expanded to the maximum.

[0029] When the gas to be tested is being transported, the external gas delivery mechanism gradually inputs the gas to be tested from the gas inlet. At the same time, the piston plate 21 gradually rises in the gas chamber 11, and the first chamber 111 is gradually formed. As the piston plate 21 rises, the space of the first chamber 111 gradually expands. The gas to be tested continuously enters the first chamber 111 during the process of its formation and gradual expansion. It can also be understood that as the piston plate 21 rises, the gas to be tested is drawn into the first chamber 111 until the piston plate 21 rises to the designated position. After the input amount of the gas to be tested reaches the set standard, the valve set at the gas inlet is closed, and then the concentration of the gas to be tested can be detected by the detection mechanism 3.

[0030] After the gas to be tested is delivered, the valve at the air inlet opens, and the piston plate 21 returns to its original position and descends in the air chamber 11. At this time, the space of the first chamber 111 is squeezed and reduced until the piston plate 21 descends to its initial position and the first chamber 111 is squeezed and disappears.

[0031] In summary, the gas to be tested is injected into the first chamber 111 simultaneously with the rise of the piston plate 21, i.e., the formation of the first chamber 111. At this time, the first chamber 111 is filled with the gas to be tested. Air cannot enter the first chamber 111 during its formation and expansion, thus reducing the dilution of the gas to be tested by air during the detection process. Furthermore, during the resetting process of the piston plate 21, the gas to be tested in the first chamber 111 can be discharged from the first chamber 111, and the discharged gas is collected by an external collection device to avoid residual gas to be tested in the first chamber 111, which would affect subsequent detection. In other words, the gas is discharged from the gas chamber 11 in an isolated manner, and theoretically, the gases detected in the two tests will not overlap, thus avoiding direct discharge into the external environment and causing environmental pollution.

[0032] In an optional embodiment, preferably, the adjustment mechanism 2 further includes a drive assembly 22, which is installed in the second chamber 112 and connected to the piston plate 21.

[0033] Specifically, the drive assembly 22 can be a linear drive mechanism such as a cylinder or an electric push rod. When the drive assembly 22 is a cylinder, the cylinder is arranged vertically inside the second chamber 112. The fixed end of the cylinder is connected to the inner wall of the detection box 1, and the telescopic shaft of the output end is fixedly connected to the piston plate 21. In this embodiment, the lifting and lowering of the piston plate 21 in the air chamber 11 is controlled by the stretching and contraction of the telescopic shaft at the output end of the cylinder, that is, the volume of the first chamber 111 is controlled, and the gas to be tested is pumped into the first chamber 111 by the lifting and lowering.

[0034] In the above embodiment, the gas to be tested is drawn into the first chamber 111 by means of piston plate 21. At this time, the gas to be tested is in a flowing state in the first chamber 111. When the detection mechanism 3 is located inside the first chamber 111 and the gas to be tested is a high concentration of volatile organic compounds (VOCs), the gas flow rate is high during the gas extraction process. If the detection mechanism 3, i.e. the concentration sensor, is directly exposed to the flowing gas, the rapid flow of high concentration VOCs will directly wash over the sensor surface, which will cause the sensor to "poison" phenomenon, such as overload of sensitive material, excessive adsorption on the sensor surface, etc. Therefore, in order to solve the above technical problems, in another embodiment of the present invention, the piston plate 21 further has a first position and a second position. When the piston plate 21 is in the first position, the detection mechanism 3 is located in the second chamber 112. When the piston plate 21 is in the second position, the detection probe 31 of the detection mechanism 3 (those skilled in the art will understand that the following terms "connection", "extension", and "detection" all refer to the detection probe 31) extends into the first chamber 111.

[0035] Specifically, the first position of piston plate 21 is the initial position of piston plate 21, and the second position of piston plate 21 is the position after piston plate 21 rises to a specified height. The stroke of piston plate 21 from the first position to the second position is the first stroke.

[0036] In the first stroke, when the piston plate 21 is in the first position, the detection mechanism 3 is located in the second chamber 112. At this time, the detection mechanism 3 is not connected to the first chamber 111, that is, the gas in the first chamber 111 cannot come into contact with the detection mechanism 3, so the detection mechanism 3, i.e., the concentration sensor, cannot be "poisoned". When the piston plate 21 is in the second position, the first chamber 111 is fully formed, the piston plate 21 stops rising, and the valve at the air inlet is also closed. After standing for a period of time, the gas to be tested in the first chamber 111 is in a static state. At this time, the detection mechanism 3 is inserted into the first chamber 111, which can reduce the phenomenon of poisoning of the detection mechanism 3.

[0037] More specifically, a hole 55 is provided at the center of the piston plate 21, and a switch mechanism 5 is installed inside the hole 55. The switch mechanism 5 is used to open and close the bottom opening of the hole 55. When the piston plate 21 is in the second position, the detection probe 31 of the detection mechanism 3 extends into the hole 55, and at the same time, the switch mechanism 5 opens the bottom opening of the hole 55.

[0038] Specifically, the hole 55 is vertically opened. In this embodiment, the switching mechanism 5 can be a valve installed in the hole 55. When the piston plate 21 is in the first position, the valve is in the closed state. As the piston plate 21 moves from the first position to the second position, the piston plate 21 moves relative to the detection mechanism 3. The detection probe 31 of the detection mechanism 3 gradually extends into the hole 55. When the detection probe 31 extends into the hole 55, the piston plate 21 reaches the second position. At this time, the valve in the hole 55 is opened, and the first chamber 111 is connected to the hole 55. The gas to be tested in the first chamber 111 enters the hole 55. At this time, the gas to be tested can be detected by the detection probe 31.

[0039] In an optional embodiment, preferably, a support plate 4 is mounted on the upper surface of the piston plate 21, the drive assembly 22 is connected to the piston plate 21 through the support plate 4, a locking mechanism 6 is installed between the support plate 4 and the piston plate 21, the switching mechanism 5 includes a first rack 51 and a second rack 52, the upper end of the first rack 51 is connected to the support plate 4, the lower end extends into the interior of the piston plate 21, a sealing plug 54 is installed inside the hole 55, the sealing plug 54 has a frustum-shaped structure, the lower end of the second rack 52 is connected to the sealing plug 54, and a gear 53 is rotatably mounted inside the piston plate 21, the gear 53 is located between the first rack 51 and the second rack 52, and meshes with the first rack 51 and the second rack 52.

[0040] Specifically, such as Figure 3 As shown, the sealing plug 54 has a frustum-shaped structure, and the upper end of the hole 55 has a cylindrical structure. The middle and lower ends are combined to form a frustum-shaped structure that matches the sealing plug 54. When the piston plate 21 is in the first position, the piston plate 21 and the support plate 4 are locked. When the drive assembly 22 pulls the support plate 4 upward, it will drive the piston plate 21 to rise synchronously in the air chamber 11. The support plate 4 has a clearance hole inside, which is connected to the hole 55. The piston plate 21 has a receiving groove 56 inside. The first rack 51, the gear 53 and the second gear 53 are all located inside the receiving groove 56. The first rack 51 and the second rack 52 are both in a limiting contact fit with the receiving groove 56.

[0041] When the piston plate 21 moves to the second position, the detection probe 31 on the detection mechanism 3 passes through the clearance hole and enters the upper end of the hole 55. A sealing ring is provided at the upper opening of the hole 55. When the detection probe 31 extends into the hole 55, a dynamic sealing connection is formed with the inner wall of the hole 55 through the sealing ring. At the same time, the locking mechanism 6 releases the lock between the piston plate 21 and the support plate 4. At this time, when the drive assembly 22 continues to drive the support plate 4 to move upward, the piston plate 21 will be held in the second position due to the air pressure in the first chamber 111 and the friction with the inner wall of the detection box 1, that is, the piston plate 21 remains stationary. At this time, the support plate 4 and the piston plate 21 move relative to each other. The support plate 4 gradually rises, and the distance between the piston plate 21 and the support plate 4 is gradually increased. The rise of the piston plate 21 drives the first rack 51 to rise synchronously. The lifting mechanism drives the gear 53 to rotate inside the piston plate 21. The rotation of the gear 53 causes the second rack 52 to descend. The descent of the second rack 52 causes the sealing plug 54 to descend within the hole 55. Due to the frustum-shaped structure of the sealing plug 54, it will not adhere to the inside of the hole 55 after it descends. That is, the distance between the descending sealing plug 54 and the inner wall of the hole 55 is opened. It can be understood that the lower opening of the hole 55 is opened. At this time, the gas to be tested in the first chamber 111 will enter the hole 55 through this distance and come into contact with the detection probe 31 inside the hole 55. Since the upper opening of the hole 55 is sealed by the insertion of the detection probe 31, the gas to be tested in the first chamber 111 will not enter the second chamber 112, and the air in the second chamber 112 will not enter the hole 55 to dilute the gas to be tested.

[0042] After the test is completed, the drive mechanism drives the support plate 4 to descend. During the descent, the piston plate 21 remains stationary in the second position. The descent of the support plate 4 drives the first rack 51 to descend synchronously. The first rack 51 drives the gear 53 to rotate and reset, which in turn drives the second rack 52 to rise. The rise of the second rack 52 drives the sealing plug 54 to rise synchronously. Due to the frustum-shaped structure of the sealing plug 54, when it is reset and inserted into the hole 55, as the distance between it and the inner wall of the hole 55 decreases, the gas to be tested can be squeezed out from the hole 55. This allows the gas to be tested remaining in the hole 55 to re-enter the first chamber 111, preventing the gas to be tested from leaking into the second chamber 112 after the piston plate 21 descends and the upper opening of the hole 55 is opened. The gas to be tested then leaks into the external environment through the second chamber 112, ensuring that the gas to be tested in the first chamber 111 can be effectively collected after the test.

[0043] Finally, after the support plate 4 descends and comes into contact with the upper surface of the piston plate 21, the locking mechanism 6 locks the support plate 4 and the piston plate 21 again. As the support plate 4 and the piston plate 21 continue to descend, the piston plate 21 gradually moves from the second position to the first position and gradually discharges the gas to be tested in the first chamber 111 to facilitate the entry and detection of other gases to be tested.

[0044] Furthermore, the first rack 51 consists of a blank section 511 and an engaging section 512. The blank section 511 is located above the engaging section 512. In the initial stage of the support plate 4 rising, the blank section 511 on the first rack 51 passes the gear 53, at which time the gear 53 remains stationary. After a period of rising, the engaging section 512 of the first rack 51 contacts the gear 53, causing the gear 53 to rotate, and the first rack 51 and the sealing plug 54 to descend. That is to say, after the piston plate 21 moves to the second position, the first chamber 111... The gas to be tested has been filled. At this time, during the upward movement of the support plate 4, the blank section 511 is set so that the sealing plug 54 will not move immediately after the piston plate 21 reaches the second position. Instead, after a period of time, the bottom opening of the hole 55 is opened by the movement of the sealing plug 54. This period of time allows the gas to be tested in the first chamber 111 to stand still, so that it changes from the flowing state that has just been drawn in to a stable static state. This reduces the "poisoning" phenomenon of the detection mechanism 3 caused by the gas to be tested in the first chamber 111 due to the excessive flow speed.

[0045] In an optional embodiment, the locking mechanism 6 includes a first wedge 61 and a second wedge 62. A groove 67 is provided on the upper surface of the piston plate 21, and a protrusion 64 is installed on the lower surface of the support plate 4. The protrusion 64 is located in the groove 67 and forms a limiting contact engagement with the groove 67. The locking mechanism 6 includes a first wedge 61, a locking block 63, and a second wedge 62. A limiting groove 65 is also provided inside the piston plate 21. The first wedge 61, the locking block 63, and the second wedge 62 are all installed inside the limiting groove 65. The first wedge 61 and the locking block 63 are arranged horizontally, and the second wedge 62 is arranged vertically. The first wedge 61 and the second wedge 62 form a wedge-shaped engagement. One end of the locking block 63 is fixedly connected to the first wedge 61, and the other end extends out from the inner opening of the limiting groove 65 and enters the groove 67. A slot is provided on the outer wall of the protrusion 64, and the locking block 63 forms a limiting contact engagement with the slot. A limiting plate 66 is fixedly installed on the inner wall of the detection box 1.

[0046] Specifically, such as Figure 4As shown, springs are installed on both the first wedge 61 and the second wedge 62. When the piston plate 21 is in the first position, the second wedge 62 extends out from the upper opening of the limiting groove 65 and extends into the inner opening of the limiting groove 65. The extended end enters the groove and forms a limiting contact engagement with the groove, that is, the piston plate 21 and the support plate 4 are in a locked state. At this time, the springs on the second wedge 62 and the first wedge 61 are in a natural state.

[0047] As the piston plate 21 gradually rises and moves to the second position, the extended end of the second wedge 62 contacts the limiting plate 66. As the piston plate 21 continues to move, the second wedge 62 is squeezed and retracted into the limiting groove 65, that is, the second wedge 62 descends in the limiting groove 65. The spring on the second wedge 62 begins to contract. When the second wedge 62 descends, it drives the first wedge 61 to move away from the locking block 63 through its wedge-shaped engagement with the first wedge 61, and drives the locking block 63 to move synchronously, so that the locking block 63 also retracts into the limiting groove 65. At this time, the locking block 63 disengages from the locking groove, and the spring on the first wedge 61 begins to contract synchronously. That is, at this time, the locking state between the piston plate 21 and the support plate 4 is released. Under the continued drive of the driving mechanism, the support plate 4 can move relative to the piston plate 21, that is, the support plate 4 rises and the piston plate 21 remains stationary.

[0048] When the piston plate 21 returns to the first position from the second position, the piston plate 21 causes the limiting plate 66 to disengage from the second wedge 62 during the descent. Then, the second wedge 62 begins to return to the starting position under the action of its upper spring. The upper end of the second wedge 62 extends out from the upper end of the limiting groove 65 again. At the same time, after the second wedge 62 moves, the first wedge 61 begins to return to the starting position under the action of its upper spring, and pushes the locking block 63 to move in the limiting groove 65. One end of the locking block 63 is pushed out from the limiting groove 65 and extends into the slot in the protrusion 64. The extension of the locking block 63 once again forms a lock between the support plate 4 and the piston plate 21.

[0049] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A smart gas concentration detection device, comprising a detection chamber, wherein a gas to be tested is delivered into the gas chamber, and a detection mechanism is installed in the gas chamber, characterized in that, An adjustment mechanism is also installed inside the gas chamber. This mechanism is used to isolate and expel air from the gas chamber before the gas to be tested is input. The adjustment mechanism includes a piston plate installed inside the gas chamber, which divides the gas chamber into a first chamber and a second chamber. The first chamber is located below the second chamber. The piston plate has a first position and a second position. When the piston plate is in the first position, the detection mechanism is located in the second chamber. When the piston plate is in the second position, the detection probe of the detection mechanism extends into the first chamber. A hole is provided at the center of the piston plate, and a switching mechanism is installed inside the hole. The switching mechanism is used to open and close the bottom opening of the hole. When the piston plate is in the second position, the detection probe of the detection mechanism extends into the hole, and the switching mechanism opens the bottom opening of the hole. A support plate is installed on the upper surface of the piston plate. The drive assembly is connected to the piston plate through the support plate. The device is equipped with a locking mechanism. The switching mechanism includes a first rack and a second rack. The upper end of the first rack is connected to a support plate, and the lower end extends into the interior of the piston plate. A sealing plug with a frustum-shaped structure is installed inside the hole. The lower end of the second rack is connected to the sealing plug. A gear is rotatably installed inside the piston plate. The gear is located between the first rack and the second rack and meshes with them. The adjustment mechanism also includes a drive assembly. After the test is completed, the drive assembly drives the support plate to descend. During the descent, the piston plate remains stationary in the second position. The descent of the support plate causes the first rack to descend synchronously. The first rack drives the gear to reset and rotate, which in turn drives the second rack to reset and rise. The rise of the second rack causes the sealing plug to rise synchronously. When it resets and extends into the hole, as the distance between it and the inner wall of the hole decreases, the gas to be tested can be squeezed out from the hole. The first rack consists of a blank section and an engaging section, with the blank section located above the engaging section.

2. The intelligent gas concentration detection device according to claim 1, characterized in that, The piston plate is arranged horizontally and is dynamically sealed to the inner wall of the detection chamber. The piston plate is driven to move up and down inside the chamber.

3. The intelligent gas concentration detection device according to claim 1, characterized in that, The drive assembly is installed in the second chamber and connected to the piston plate.

4. The intelligent gas concentration detection device according to claim 1, characterized in that, The piston plate has an internal receiving groove, and the first rack, the gear, and the second rack are all located inside the receiving groove. The first rack and the second rack are in a limiting contact engagement with the receiving groove.

5. The intelligent gas concentration detection device according to claim 1, characterized in that, The locking mechanism includes a first wedge, a locking block, and a second wedge. A groove is formed on the upper surface of the piston plate, and a protrusion is installed on the lower surface of the support plate. The protrusion is located in the groove and forms a limiting contact engagement with the groove. A limiting groove is also formed inside the piston plate. The first wedge, the locking block, and the second wedge are all installed inside the limiting groove. The first wedge and the locking block are arranged horizontally, and the second wedge is arranged vertically. The first wedge and the second wedge form a wedge-shaped engagement. One end of the locking block is fixedly connected to the first wedge, and the other end extends out from the inner opening of the limiting groove and enters the groove. A locking groove is formed on the outer wall of the protrusion. The locking block and the locking groove form a limiting contact engagement. A limiting plate is fixedly installed on the inner wall of the detection box.

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