Gas sampling device for environment detection

Abstract

The invention belongs to the technical field of environment detection, and particularly discloses a gas sampling device for environment detection, which comprises a mounting platform, a vertical mounting disc and a horizontal double-end synchronous sealing linkage mechanism are arranged above the mounting platform, and placing tanks are horizontally and fixedly arranged on one side of the mounting disc along an axis circumference array; the outer side of each placing tank is coaxially and tightly sleeved with a collecting cylinder, the end, away from the mounting disc, of each placing tank is coaxially provided with a bottom end sealing mechanism, the double-end synchronous sealing linkage mechanism and each placing tank are coaxially arranged at intervals, and the end, close to the placing tank, of each double-end synchronous sealing linkage mechanism is provided with a top end sealing mechanism; a sealing driving mechanism is arranged on one side, far away from the placing tank, of the double-end synchronous sealing linkage mechanism, and a static sampling driving mechanism is arranged on the other side of the mounting disc. A static collecting and sampling mode is adopted, negative pressure driving is not needed, the influence of airflow disturbance on the authenticity of the sample is avoided, complex pre-preparation work is not needed, and the field sampling process is greatly simplified.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental detection, and specifically refers to a gas sampling device for environmental detection. Background Art

[0002] With the acceleration of industrialization and the increasing frequency of human activities, environmental pollution has become increasingly serious and has become a focus of global concern. Among them, air pollution poses a serious threat to human health, ecosystems and social and economic development. Therefore, accurate and reliable detection of environmental gases is an important prerequisite for evaluating environmental quality, formulating pollution control strategies and protecting public health.

[0003] Since the composition of ambient gases is complex, the concentration varies greatly, and many trace gas components have a significant impact on the test results, it is usually necessary to bring the collected gas samples back to the laboratory and use high-precision instruments and equipment for detailed analysis. This is because the laboratory environment is controllable and can effectively avoid interference from external factors. In addition, the laboratory is usually equipped with a variety of advanced analytical instruments that can perform comprehensive qualitative and quantitative analysis of gas samples. However, the existing gas sampling technology still has some shortcomings in ensuring sample representativeness and accuracy, which are mainly reflected in the following two aspects: In order to ensure that the collected gas samples can truly reflect the original composition of the environment to be tested, the prior art generally adopts the following methods: syringe sampling and its extension, this method creates an initial gas-free space and then sucks in the gas to be tested to avoid interference of the original gas in the sampling device on the sample; vacuum container sampling and its extension, this method uses a container that has been evacuated to vacuum in advance, and relies on negative pressure to suck in the gas to be tested. The control of the vacuum degree in this method has a great influence on the sampling results; air pump displacement sampling, this method uses an air pump to extract a large amount of gas to be tested to replace the original gas in the sampling device as much as possible, but this method requires a lot of energy, and the replacement effect is affected by the performance of the air pump and the sampling time; inert gas purging, this method uses nitrogen and other inert gases to flush the sampling container multiple times to remove the original gas remaining in the container, but this method is cumbersome to operate and requires a large amount of inert gas. Most of the above methods require cumbersome and precise pre-steps to achieve high accuracy requirements, which makes the on-site sampling and preparation process complicated and time-consuming.

[0004] The above sampling methods (such as vacuum container sampling, syringe sampling, etc.) all rely on the negative pressure principle to draw the measured gas into the sampling device. However, the generation of negative pressure will inevitably form a pressure gradient near the sampling port, thereby inducing the flow of the surrounding air, that is, generating airflow disturbances, causing the composition of the detected gas to change, or introducing gas from the non-test space, thereby causing sample distortion. For example, the negative pressure area may exceed the test range, causing the negative pressure to inhale the surrounding air, dilute the measured gas, and introduce gas components from non-target areas, interfering with the detection of the target object; and the airflow disturbance changes the distribution of particles, causing them to settle or rise under the influence of air pressure, resulting in inaccurate particle concentration. Summary of the invention

[0005] In view of the above situation, the present invention provides a gas sampling device for environmental detection, which adopts a static collection and sampling method, does not require negative pressure drive, avoids the influence of airflow disturbance on the authenticity of the sample, does not require complicated pre-preparation work, greatly simplifies the on-site sampling process, improves sampling efficiency and convenience, and realizes in-situ, non-destructive and rapid collection of environmental gases.

[0006] The technical solution adopted by the present invention is as follows: The present invention proposes a gas sampling device for environmental detection, including an installation platform, a vertical installation disk and a horizontal double-end synchronous sealing linkage mechanism are arranged above the installation platform, a placement tank is horizontally fixedly arranged in an array along the axial circumference on one side of the installation disk, a collection tube is coaxially and tightly sleeved on the outer side of each placement tank, a bottom sealing mechanism is coaxially arranged at one end of each placement tank away from the installation disk, which is used to seal the bottom of the collection tube, the double-end synchronous sealing linkage mechanism is coaxially spaced with each placement tank, and a top sealing mechanism is arranged at one end of each double-end synchronous sealing linkage mechanism close to the placement tank, which is used to seal the top of the collection tube, a sealing drive mechanism is arranged on the side of the double-end synchronous sealing linkage mechanism away from the placement tank, which is used to provide power for the sealed collection tube, and a static sampling drive mechanism is arranged on the other side of the installation disk, which is used to provide power for sampling, all double-end synchronous sealing linkage mechanisms are fixedly connected to the installation platform through an umbrella-shaped frame fixed on the inner side, and the installation disk, the sealing drive mechanism and the static sampling drive mechanism are fixedly connected to the installation platform through a support rod fixed on the lower side.

[0007] Further, the double-end synchronous sealing linkage mechanism includes an outer tube, which is horizontally fixed on the umbrella-shaped frame, an inner tube is coaxially and tightly slidably provided on the inner side of the outer tube, a sliding column is coaxially and tightly slidably provided on the inner side of the inner tube, a spiral groove is provided on the side surface of the sliding column along the length direction, a limit head is fixedly provided on the inner surface of the inner tube, and the limit head is slidably connected with the spiral groove, a first annular groove and a second annular groove are coaxially provided on the inner surface of the outer tube near the placement tank, the first annular groove and the second annular groove have the same cross-sectional dimensions and are arranged at intervals, the second annular groove is close to the end of the outer tube, and a long groove is vertically connected between the first annular groove and the second annular groove, the long grooves are symmetrically arranged, and the depth of the long groove is less than the depth of the first annular groove, a slider is symmetrically fixedly provided at one end of the sliding column near the placement tank, the slider can slide in close contact with the long groove, and the thickness of the slider is equal to the thickness of the first annular groove, a first follower column is coaxially fixedly provided at one end of the sliding column near the placement tank, and a second cross block is coaxially fixedly provided at one end of the first follower column.

[0008] Furthermore, the top sealing mechanism includes a top cover, which is coaxially arranged on one side of the second cross block, a protrusion is coaxially fixed on one side of the top cover, a second cross groove is opened on the surface of the protrusion, the second cross groove is tightly and plug-slidably fitted with the second cross block, a cover ring is coaxially fixed on the edge of the other side of the top cover, a second follower column is coaxially fixed on the cover ring side of the top cover, and a screw cover is coaxially fixed on one end of the second follower column.

[0009] Furthermore, the bottom end sealing mechanism includes a bottom cover, which is coaxially and tightly arranged at one end of the placement tank, the diameter of the bottom cover is equal to the outer diameter of the placement tank, a first cross groove is coaxially opened on the surface of one side of the bottom cover, a screw is coaxially fixedly arranged on the other side of the bottom cover, a conical sealing gasket is coaxially and tightly arranged on the screw side of the bottom cover, the edge of the conical sealing gasket is aligned with the edge of the bottom cover, the tightening end of the conical sealing gasket faces away from the bottom cover, a gasket is coaxially and tightly arranged on one side of the tightening end of the conical sealing gasket, one end of the screw passes through the conical sealing gasket and the gasket and then a square nut is threadedly sleeved, and the square nut can be tightly and socket-slidably matched with the screw cover.

[0010] Further, the sealing drive mechanism includes a first electric telescopic rod, which is fixed at the upper end of the support rod, the output end of the first electric telescopic rod faces the placement tank, the output end of the first electric telescopic rod is coaxially fixed with a first cross rod, the edge of the first cross rod is coaxially fixed with a first mounting ring, the first mounting ring is horizontally fixed with a first push column on the side facing the placement tank, the first push columns are arranged in groups of two, and the first push columns of all groups are distributed in an array along the circumference of the axis of the first mounting ring, and the two first push columns of each group are fixedly connected to one end of the adjacent inner tube.

[0011] Furthermore, the static sampling drive mechanism includes a second electric telescopic rod, which is fixed at the upper end of the support rod, the output end of the second electric telescopic rod faces the mounting plate, the output end of the second electric telescopic rod is coaxially fixed with a second cross rod, the edge of the second cross rod is coaxially fixed with a second mounting ring, and the second mounting ring is horizontally fixed with a second push pin on the side of the second mounting ring facing the mounting plate, the second push pins are arranged in groups of two, and all groups of second push pins are distributed in an array along the circumference of the axis of the second mounting ring.

[0012] Furthermore, the placement tank is a closed structure, and a first cross block is coaxially fixed on the outer side of the end of the placement tank. The first cross block and the first cross groove are tightly and slidably matched. An electromagnet is fixed on the inner side of the end of the placement tank. The electromagnet is electrically connected to a wire, and the wire extends out of the placement tank. The electromagnet can make the placement tank absorb the bottom cover.

[0013] Furthermore, the height of the collecting tube is equal to the sum of the height of the placement tank extending out of the mounting plate and the height of the bottom cover. The outer edge of one end of the collecting tube close to the double-end synchronous sealing linkage mechanism can be connected with the sealing thread on the inner side of the cover ring. A push block is fixedly provided laterally symmetrically at the other end of the collecting tube. A groove is provided on the surface of the push block. After the second push column passes through the mounting plate, it can be tightly and slidably fitted in the groove.

[0014] Furthermore, when the second electric telescopic rod is in an initial state and one end of the collection tube is in close contact with the mounting plate, the second push column is in close contact with the bottom of the groove; after the second electric telescopic rod is extended and stopped, the end face of the collection tube facing the mounting plate is flush with the end face of the placement tank; when the first electric telescopic rod is in an initial state, the slider is completely located in the first annular groove; the moment the slider completely enters the second annular groove, the cover ring and the collection tube begin to be in threaded contact and the screw cover covers the square nut; after the slider moves 180 degrees in a circle in the second annular groove, the first electric telescopic rod stops extending; and the cover ring and the collection tube are relatively rotated 180 degrees to achieve threaded sealing.

[0015] Furthermore, the conical sealing gasket is made of elastic rubber sealing material.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: (1) The present invention adopts a unique static sampling method. The second electric telescopic rod drives the second push column to push the collection tube out of the placement tank synchronously, and together with the bottom cover, a closed sampling space is formed. This process covers the gas to be tested, rather than the traditional suction method. The entire sampling process does not utilize any negative pressure or suction device, so no pressure gradient will be formed near the sampling port. The extension movement of the collection tube is smooth and slow, and will not produce additional push and pull effects on the surrounding gas, avoiding the interference of mechanical movement on the airflow. This disturbance-free, negative pressure-free static sampling method retains the original state of the gas to be tested to the greatest extent, avoids the impact on the gas composition and particle distribution, ensures the authenticity and representativeness of the collected samples, and provides reliable guarantee for subsequent accurate analysis.

[0017] (2) After the collection tube is extended and the sampling space is formed, the first electric telescopic rod drives the double-end synchronous sealing linkage mechanism to work, controlling the threaded connection between the cover ring on the top cover and the collection tube, as well as the cooperation between the screw cover and the square nut, so that the cover ring and the collection tube thread are sealed. At the same time, the screw cover drives the square nut to rotate, so that the conical sealing gasket expands and contacts closely with the inner wall of the collection tube to achieve bottom sealing. The synchronous sealing design of the top and bottom ensures that the collection tube forms a completely closed space after sampling is completed, isolating the pollution from the external environment, and ensuring the integrity and purity of the sample before analysis.

[0018] (3) Before sampling, it is only necessary to fix the bottom cover on the placement tank through the cooperation of the first cross groove and the first cross block, adsorb it with an electromagnet, put the collection tube on the outside of the placement tank, and ensure that the second push rod is inserted into the groove, and connect the top cover to the double-end synchronous sealing linkage mechanism through the cooperation of the second cross groove and the second cross block. The preparation work of this device is extremely simple, and there is no need for complicated pre-steps such as vacuuming and inert gas purging. All connections are simple plug-in or magnetic suction methods, and the operation is fast and convenient. This simplified preparation process greatly shortens the on-site sampling time, improves sampling efficiency, and reduces the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a first three-dimensional structural schematic diagram of a gas sampling device for environmental detection proposed by the present invention.

[0020] Figure 2 This is a second three-dimensional structural schematic diagram of a gas sampling device for environmental detection proposed by the present invention.

[0021] Figure 3 This is a front view of a gas sampling device for environmental detection proposed by the present invention.

[0022] Figure 4 The present invention is a schematic diagram of the explosion structure of a gas sampling device for environmental detection proposed by the present invention.

[0023] Figure 5 The present invention is a schematic structural diagram of a double-end synchronous sealing linkage mechanism of a gas sampling device for environmental detection.

[0024] Figure 6 This is a schematic structural diagram of a top sealing mechanism of a gas sampling device for environmental detection proposed by the present invention.

[0025] Figure 7 The present invention is a schematic diagram of the explosion structure of the bottom sealing mechanism of a gas sampling device for environmental detection proposed by the present invention.

[0026] Figure 8 This is a schematic diagram of the exploded structure of the positional relationship between the second push column and the groove of a gas sampling device for environmental detection proposed by the present invention.

[0027] Fig. 9 for Figure 2 Enlarged view of part A.

[0028] Fig.10 This is a schematic structural diagram of a placement tank for a gas sampling device for environmental detection proposed by the present invention.

[0029] Fig.11 This is a working principle diagram of a gas sampling device for environmental detection proposed by the present invention.

[0030] Among them, 1. installation platform, 11. support rod, 12. umbrella-shaped frame, 2. installation plate, 3. placement tank, 31. first cross block, 32. electromagnet, 33. wire, 4. collection tube, 41. push block, 42. groove, 5. bottom sealing mechanism, 51. bottom cover, 52. first cross groove, 53. screw, 54. conical sealing gasket, 55. gasket, 56. square nut, 6. double-end synchronous sealing linkage mechanism, 61. outer tube, 62. inner tube, 63. sliding column, 631. slider, 64. spiral groove, 65. limit head, 66. The first follower column, 661, the second cross block, 67, the first ring groove, 68, the second ring groove, 69, the long groove, 7, the top sealing mechanism, 71, the top cover, 72, the protrusion, 73, the second cross groove, 74, the cover ring, 75, the second follower column, 76, the screw cover, 8, the sealing drive mechanism, 81, the first electric telescopic rod, 82, the first cross rod, 83, the first mounting ring, 84, the first push column, 9, the static sampling drive mechanism, 91, the second electric telescopic rod, 92, the second cross rod, 93, the second mounting ring, 94, the second push column.

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, the present invention proposes a gas sampling device for environmental detection, including a mounting platform 1, a vertical mounting plate 2 and a horizontal double-end synchronous sealing linkage mechanism 6 are arranged above the mounting platform 1, a placement tank 3 is horizontally fixedly arranged in an array along the axial circumference on one side of the mounting plate 2, a collection tube 4 is coaxially and tightly sleeved on the outer side of each placement tank 3, a bottom sealing mechanism 5 is coaxially arranged at one end of each placement tank 3 away from the mounting plate 2, the double-end synchronous sealing linkage mechanism 6 is coaxially and spaced apart from each placement tank 3, a top sealing mechanism 7 is arranged at one end of each double-end synchronous sealing linkage mechanism 6 close to the placement tank 3, a sealing drive mechanism 8 is arranged at the side of the double-end synchronous sealing linkage mechanism 6 away from the placement tank 3, a static sampling drive mechanism 9 is arranged on the other side of the mounting plate 2, all the double-end synchronous sealing linkage mechanisms 6 are fixedly connected to the mounting platform 1 through an umbrella-shaped frame 12 fixed on the inner side, and the mounting plate 2, the sealing drive mechanism 8 and the static sampling drive mechanism 9 are fixedly connected to the mounting platform 1 through a support rod 11 fixed on the lower side.

[0035] The mounting platform 1 serves as the basis of the entire device. The umbrella-shaped frame 12 connects all double-end synchronous sealing linkage mechanisms 6 to the mounting platform 1 , and the support rod 11 fixes the mounting plate 2 , the sealing drive mechanism 8 and the static sampling drive mechanism 9 on the mounting platform 1 .

[0036] The double-end synchronous sealing linkage mechanism 6 includes an outer tube 61, which is horizontally fixed on the umbrella-shaped frame 12, and an inner tube 62 is coaxially and tightly slidably provided on the inner side of the outer tube 61, and a sliding column 63 is coaxially and tightly slidably provided on the inner side of the inner tube 62, and a spiral groove 64 is provided on the side surface of the sliding column 63 along the length direction, and a limit head 65 is fixedly provided on the inner surface of the inner tube 62, and the limit head 65 is slidably connected with the spiral groove 64, and a first annular groove 67 and a second annular groove 68 are coaxially provided on the inner surface of the outer tube 61 near the position where the tank 3 is placed, and the cross-sectional dimensions of the first annular groove 67 and the second annular groove 68 are the same and The second annular groove 68 is arranged at intervals, and is close to the end of the outer tube 61. A long groove 69 is vertically connected between the first annular groove 67 and the second annular groove 68. The long groove 69 is symmetrically arranged, and the depth of the long groove 69 is less than that of the first annular groove 67. A slider 631 is symmetrically fixed laterally on one end of the sliding column 63 close to the placement tank 3. The slider 631 can slide tightly with the long groove 69, and the thickness of the slider 631 is equal to the thickness of the first annular groove 67. A first follower column 66 is coaxially fixed on one end of the sliding column 63 close to the placement tank 3, and a second cross block 661 is coaxially fixed on one end of the first follower column 66.

[0037] The inner tube 62 and the sliding column 63 slide in the outer tube 61, and the spiral groove 64 on the sliding column 63 cooperates with the limit head 65 on the inner tube 62 to realize the conversion of the linear motion and rotational motion of the sliding column 63. The first annular groove 67, the second annular groove 68 and the long groove 69 are used to control the motion trajectory of the slider 631. The slider 631 can only move linearly in the long groove 69 and can rotate freely in the first annular groove 67 and the second annular groove 68. The first follower column 66 and the second cross block 661 are used to transmit motion and connect the top sealing mechanism 7.

[0038] Among them, the top sealing mechanism 7 includes a top cover 71, which is coaxially arranged on one side of the second cross block 661, and a protrusion 72 is coaxially fixed on one side of the top cover 71. A second cross groove 73 is opened on the surface of the protrusion 72. The second cross groove 73 is tightly and plug-slidably fitted with the second cross block 661. A cover ring 74 is coaxially fixed on the edge of the other side of the top cover 71. A second follower column 75 is coaxially fixed on the side of the cover ring 74 of the top cover 71, and a screw cover 76 is coaxially fixed on one end of the second follower column 75.

[0039] The top cover 71 is connected to the second cross block 661 through the second cross groove 73 on the protrusion 72 to achieve the transmission of rotational motion. The cover ring 74 is used for threaded connection with the collection tube 4 to achieve sealing. The second follower column 75 and the screw cover 76 are used to transmit rotational motion and connect the bottom sealing mechanism 5.

[0040] Among them, the bottom end sealing mechanism 5 includes a bottom cover 51, which is coaxially and tightly arranged at one end of the placement tank 3, and the diameter of the bottom cover 51 is equal to the outer diameter of the placement tank 3. A first cross groove 52 is coaxially opened on the surface of one side of the bottom cover 51, and a screw 53 is coaxially fixed on the other side of the bottom cover 51. A conical sealing gasket 54 is coaxially and tightly arranged on the side of the screw 53 of the bottom cover 51, and the edge of the conical sealing gasket 54 is aligned with the edge of the bottom cover 51, and the tightening end of the conical sealing gasket 54 faces away from the bottom cover 51, and a gasket 55 is coaxially and tightly arranged on one side of the tightening end of the conical sealing gasket 54. After one end of the screw 53 passes through the conical sealing gasket 54 and the gasket 55, a square nut 56 is threadedly sleeved, and the square nut 56 can be tightly and socket-slidably matched with the screw cover 76.

[0041] The bottom cover 51 cooperates with the first cross block 31 on the placement tank 3 through the first cross groove 52 to fix the bottom cover 51. The screw 53, the conical sealing gasket 54, the gasket 55 and the square nut 56 form a sealing structure. When the square nut 56 rotates, it pushes the gasket 55 and the conical sealing gasket 54. The middle part of the conical sealing gasket 54 is squeezed, so that the edge of the conical sealing gasket 54 expands outward, thereby closely contacting with the inner wall of the collection tube 4 to achieve sealing. The screw cover 76 cooperates with the square nut 56 to drive the square nut 56 to rotate.

[0042] Among them, the sealing drive mechanism 8 includes a first electric telescopic rod 81, which is fixed at the upper end of the support rod 11, and the output end of the first electric telescopic rod 81 faces the placement tank 3. The output end of the first electric telescopic rod 81 is coaxially fixed with a first cross rod 82, and the edge of the first cross rod 82 is coaxially fixed with a first mounting ring 83. The first mounting ring 83 is horizontally fixed with a first push column 84 on one side of the placement tank 3. The first push columns 84 are arranged in groups of two, and all groups of first push columns 84 are distributed in a circular array along the axis of the first mounting ring 83. The two first push columns 84 in each group are fixedly connected to one end of the adjacent inner tube 62.

[0043] The first push pins 84 push the inner tube 62 to move, thereby driving the double-end synchronous sealing linkage mechanism 6 to work. The grouping and arrangement of the first push pins 84 ensure the synchronous movement of multiple double-end synchronous sealing linkage mechanisms 6.

[0044] Among them, the static sampling drive mechanism 9 includes a second electric telescopic rod 91, which is fixed at the upper end of the support rod 11, and the output end of the second electric telescopic rod 91 faces the mounting plate 2. A second cross rod 92 is coaxially fixed at the output end of the second electric telescopic rod 91, and a second mounting ring 93 is coaxially fixed at the edge of the second cross rod 92. A second push column 94 is horizontally fixed on one side of the second mounting ring 93 facing the mounting plate 2. The second push columns 94 are arranged in groups of two, and all groups of second push columns 94 are distributed in an array along the circumference of the axis of the second mounting ring 93.

[0045] The second push pins 94 are used to push the collecting tube 4 to extend the collecting tube 4 . The grouping and arrangement of the second push pins 94 ensures the synchronous movement of the multiple collecting tubes 4 .

[0046] Among them, the placement tank 3 is a closed structure, and a first cross block 31 is coaxially fixed on the outer side of the end of the placement tank 3. The first cross block 31 and the first cross groove 52 are tightly socketed and slidably matched. An electromagnet 32 ​​is fixed on the inner side of the end of the placement tank 3. The electromagnet 32 ​​is electrically connected to a wire 33. The wire 33 extends out of the placement tank 3. The electromagnet 32 ​​can make the placement tank 3 absorb the bottom cover 51.

[0047] The electromagnet 32 ​​is used to attract the bottom cover 51 in the initial state, so as to facilitate installation and removal.

[0048] Among them, the height of the collecting tube 4 is equal to the sum of the height of the placement tank 3 extending out of the mounting plate 2 and the height of the bottom cover 51. The outer edge of one end of the collecting tube 4 close to the double-end synchronous sealing linkage mechanism 6 can be connected with the inner side of the cover ring 74 with a sealing thread. The other end of the collecting tube 4 is laterally symmetrically fixed with a push block 41, and a groove 42 is opened on the surface of the push block 41. After the second push column 94 passes through the mounting plate 2, it can be tightly and plug-slidably matched with the groove 42.

[0049] The pushing block 41 and the groove 42 are used to cooperate with the second pushing column 94 to achieve the extension of the collecting tube 4.

[0050] Among them, when the second electric telescopic rod 91 is in the initial state and one end of the collection tube 4 is in close contact with the mounting plate 2, the second push column 94 is in close contact with the bottom of the groove 42. After the second electric telescopic rod 91 is extended and stopped, the end face of the collection tube 4 facing the mounting plate 2 is flush with the end face of the placement tank 3. When the first electric telescopic rod 81 is in the initial state, the slider 631 is completely located in the first annular groove 67. The moment the slider 631 completely enters the second annular groove 68, the cover ring 74 starts to threadably contact with the collection tube 4 and the screw cover 76 covers the square nut 56. After the slider 631 moves 180 degrees in a circle in the second annular groove 68, the first electric telescopic rod 81 stops extending, and the cover ring 74 and the collection tube 4 rotate 180 degrees relative to each other to achieve thread sealing.

[0051] The second electric telescopic rod 91 controls the extension of the collection tube 4, the first electric telescopic rod 81 controls the movement of the double-end synchronous sealing linkage mechanism 6, and the movement trajectory of the slider 631 in the first annular groove 67, the long groove 69 and the second annular groove 68 controls the threaded connection between the cover ring 74 and the collection tube 4 and the cooperation between the screw cover 76 and the square nut 56, thereby realizing the synchronous sealing of the two ends of the collection tube 4.

[0052] The conical sealing pad 54 is made of elastic rubber sealing material.

[0053] The elastic rubber sealing material has good elasticity and sealing performance, and can ensure the sealing effect of the collection tube 4.

[0054] The specific working process is as follows: Preparation stage: connect the entire device to a mobile device (such as a vehicle) and a lifting device (such as a lifting platform) through the interface below the installation platform 1, move the device to a preparation area away from the actual sampling location, ensure that the first electric telescopic rod 81 and the second electric telescopic rod 91 are in the initial contracted state, align the first cross grooves 52 of all bottom covers 51 and put them on the first cross blocks 31 at the ends of the corresponding placement tanks 3. Since the first cross grooves 52 and the first cross blocks 31 are in close contact with each other and slide, this ensures the initial fixation and alignment of the bottom cover 51 and the placement tank 3. Turn on the electromagnets 32 inside all placement tanks 3. After the electromagnet 32 ​​is energized, the magnetic force generated will attract the bottom cover 51 to the end of the placement tank 3 to prevent the bottom cover 51 from accidentally falling off in subsequent operations. Each collection tube 4 is put on the outside of the placement tank 3, and the collection tube 4 is pushed toward the mounting plate 2. It is confirmed that all the second push pins 94 are fully inserted into the corresponding grooves 42 to ensure the connection and alignment between the collection tube 4 and the static sampling drive mechanism 9. The second cross grooves 73 of all the top covers 71 are aligned and put on the corresponding second cross blocks 661. The connection can also use a magnetic attraction structure to increase the stability of the connection. The entire device can be moved to the environmental area to be detected by moving equipment and lifting equipment.

[0055] Sampling stage: place the device at the position to be tested, ensure that all placement tanks 3 can surround the point to be tested, and after standing for a period of time to ensure that the air in the detection area is stable, start the second electric telescopic rod 91 of the static sampling drive mechanism 9, and the second electric telescopic rod 91 extends, and pushes all the collection tubes 4 to move synchronously away from the mounting plate 2 through the second push column 94. When the second electric telescopic rod 91 extends to the preset position and stops, the end face of each collection tube 4 facing the mounting plate 2 is flush with the end face of the corresponding placement tank 3. At this time, the collection tube 4 and the bottom cover 51 jointly form a space for collecting the gas to be tested, and the first electric telescopic rod 81 is started, and the second push column 94 is used to push all the collection tubes 4 to move synchronously away from the mounting plate 2. The first push column 84 pushes all the inner tubes 62 to move forward synchronously. In the initial stage of the movement of the inner tube 62, the slider 631 enters the long groove 69 on the inner wall of the outer tube 61. Due to the restriction of the long groove 69, the slider 631 can only move linearly along the axial direction of the long groove 69. At the same time, since the first push column 84 is fixedly connected to the inner tube 62, the inner tube 62 is also restricted from rotating. Therefore, the spiral groove 64 on the slide column 63 cooperates with the limit head 65 on the inner tube 62 to convert the linear motion of the inner tube 62 into the linear motion of the slide column 63. As the first electric telescopic rod 81 continues to extend, the slider 631 will completely enter the first push column 84 on the inner wall of the outer tube 61. The second annular groove 68, since the thickness of the slider 631 is equal to that of the first annular groove 67 and the second annular groove 68, the slider 631 will be blocked by the front end surface of the second annular groove 68 at the moment of entering the second annular groove 68, and cannot continue to move forward in a straight line. At this time, the cover ring 74 on the top cover 71 just begins to make threaded contact with one end of the collection tube 4, and the screw cover 76 just covers the square nut 56. Then the first electric telescopic rod 81 continues to extend, and the inner tube 62 also continues to move forward. The matching relationship between the spiral groove 64 on the slide column 63 and the limit head 65 on the inner tube 62 forces the slide column 63 to start rotating. Since the slider 631 is located at the second annular groove 68, the slide column 63 starts to rotate. In the groove 68, the slider 631 can rotate freely and no longer restrict the slide column 63. The rotation of the slide column 63 drives the top cover 71 to rotate. After the cover ring 74 rotates 180 degrees relative to the collection tube 4, the threaded sealing of the top is realized. At the same time, the second follower column 75 drives the screw cover 76 to rotate, and then drives the square nut 56 to rotate synchronously. The square nut 56 is threadedly connected to the screw rod 53 on the bottom cover 51. The rotating square nut 56 pushes the gasket 55 and the conical sealing gasket 54. The middle part of the conical sealing gasket 54 is squeezed. The edge of the conical sealing gasket 54 expands outward under the action of the gasket 55, and is in close contact with the inner wall of the collection tube 4 to achieve the sealing of the bottom end.

[0056] End of sampling and sample retrieval: the first electric telescopic rod 81 begins to retract, and the slider 631 first retreats from the second annular groove 68 into the long groove 69. Due to the restriction of the long groove 69, the slider 631 and the inner tube 62 return synchronously, and the second cross block 661 separates from the second cross groove 73, and the slider 631 enters the first annular groove 67. The first electric telescopic rod 81 continues to retract, and the slider 631 rotates 180 degrees in the opposite direction in cooperation with the limit head 65 and the spiral groove 64 to achieve reset. Since the extension and retraction strokes of the first electric telescopic rod 81 are the same, the linear position and rotation angle of the slider 631 are finally reset, all electromagnets 32 are turned off, the adsorption force on the bottom cover 51 is released, and each sealed collection tube 4 is removed. Since both ends of the collection tube 4 are sealed, the internal gas sample will not leak or be contaminated, and then the second electric telescopic rod 91 is retracted. At this time, all mechanisms have been completely restored to the initial state, ensuring that the initial state of the device during the next sampling is the same as this time.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0059] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A gas sampling device for environmental detection, comprising a mounting platform (1), characterized in that: A vertical mounting plate (2) and a horizontal double-end synchronous sealing linkage mechanism (6) are provided above the mounting platform (1); a placement tank (3) is horizontally fixedly provided in an array along the circumference of the axis on one side of the mounting plate (2); a collection tube (4) is coaxially and tightly sleeved on the outer side of each placement tank (3); a bottom sealing mechanism (5) is coaxially provided at one end of each placement tank (3) away from the mounting plate (2); the double-end synchronous sealing linkage mechanism (6) is coaxially spaced from each placement tank (3); and each double-end synchronous sealing linkage mechanism (6) is close to the placement tank. A top sealing mechanism (7) is provided at one end of the mounting plate (3), a sealing drive mechanism (8) is provided on the side of the double-end synchronous sealing linkage mechanism (6) away from the placement tank (3), and a static sampling drive mechanism (9) is provided on the other side of the mounting plate (2). All the double-end synchronous sealing linkage mechanisms (6) are fixedly connected to the mounting platform (1) via an umbrella-shaped frame (12) fixedly connected on the inner side, and the mounting plate (2), the sealing drive mechanism (8) and the static sampling drive mechanism (9) are fixedly connected to the mounting platform (1) via a support rod (11) fixedly connected on the lower side.

2. A gas sampling device for environmental detection according to claim 1, characterized in that: The double-end synchronous sealing linkage mechanism (6) comprises an outer tube (61), the outer tube (61) being fixedly arranged horizontally on the umbrella-shaped frame (12), an inner tube (62) being coaxially and tightly slidingly arranged on the inner side of the outer tube (61), a sliding column (63) being coaxially and tightly slidingly arranged on the inner side of the inner tube (62), a spiral groove (64) being provided on the side surface of the sliding column (63) along the length direction, a limiting head (65) being fixedly arranged on the inner side surface of the inner tube (62), the limiting head (65) being slidably connected with the spiral groove (64), a first annular groove (67) and a second annular groove (68) being coaxially arranged on the inner side surface of the outer tube (61) near the placement tank (3), the first annular groove (67) and the second annular groove (68) having the same cross-sectional dimensions and a spacing of 1 / 4. The second annular groove (68) is arranged near the end of the outer tube (61); a long groove (69) is vertically connected between the first annular groove (67) and the second annular groove (68); the long groove (69) is symmetrically arranged; the depth of the long groove (69) is less than the depth of the first annular groove (67); a slider (631) is symmetrically fixed laterally on one end of the slide column (63) near the placement tank (3); the slider (631) can be closely slidably matched with the long groove (69); the thickness of the slider (631) is equal to the thickness of the first annular groove (67); a first follower column (66) is coaxially fixed on one end of the slide column (63) near the placement tank (3); and a second cross block (661) is coaxially fixed on one end of the first follower column (66).

3. A gas sampling device for environmental detection according to claim 2, characterized in that: The top sealing mechanism (7) comprises a top cover (71), the top cover (71) being coaxially arranged on one side of the second cross block (661), a protrusion (72) being coaxially fixedly arranged on one side of the top cover (71), a second cross groove (73) being provided on the surface of the protrusion (72), the second cross groove (73) being in close contact with and slidably engaged with the second cross block (661), a cover ring (74) being coaxially fixedly arranged on the other side edge of the top cover (71), a second follower column (75) being coaxially fixedly arranged on the side of the cover ring (74) of the top cover (71), and a screw cover (76) being coaxially fixedly arranged on one end of the second follower column (75).

4. A gas sampling device for environmental detection according to claim 3, characterized in that: The bottom end sealing mechanism (5) comprises a bottom cover (51), the bottom cover (51) being coaxially and tightly arranged at one end of the placement tank (3), the diameter of the bottom cover (51) being equal to the outer diameter of the placement tank (3), a first cross groove (52) being coaxially opened on one side surface of the bottom cover (51), a screw rod (53) being coaxially fixedly arranged on the other side of the bottom cover (51), a conical sealing gasket (54) being coaxially and tightly arranged on the side of the screw rod (53) of the bottom cover (51), the edge of the conical sealing gasket (54) being aligned with the edge of the bottom cover (51), the tightening end of the conical sealing gasket (54) being facing away from the bottom cover (51), a gasket (55) being coaxially and tightly arranged on one side of the tightening end of the conical sealing gasket (54), one end of the screw rod (53) passing through the conical sealing gasket (54) and the gasket (55) and then being threadedly sleeved with a square nut (56), the square nut (56) being able to fit tightly with the screw cover (76) in a socket-slotted and sliding manner.

5. A gas sampling device for environmental detection according to claim 4, characterized in that: The sealing drive mechanism (8) comprises a first electric telescopic rod (81), the first electric telescopic rod (81) being fixedly arranged at the upper end of the support rod (11), the output end of the first electric telescopic rod (81) facing the placement tank (3), a first cross rod (82) being coaxially fixedly arranged at the output end of the first electric telescopic rod (81), a first mounting ring (83) being coaxially fixedly arranged at the edge of the first cross rod (82), a first push column (84) being horizontally fixedly arranged at one side of the first mounting ring (83) facing the placement tank (3), the first push columns (84) being arranged in groups of two, the first push columns (84) of all groups being arranged in an array along the circumference of the axis of the first mounting ring (83), and the two first push columns (84) of each group being fixedly connected to one end of an adjacent inner tube (62).

6. A gas sampling device for environmental detection according to claim 5, characterized in that: The static sampling drive mechanism (9) comprises a second electric telescopic rod (91), the second electric telescopic rod (91) being fixedly arranged at the upper end of the support rod (11), the output end of the second electric telescopic rod (91) facing the mounting plate (2), a second cross rod (92) being coaxially fixedly arranged at the output end of the second electric telescopic rod (91), a second mounting ring (93) being coaxially fixedly arranged at the edge of the second cross rod (92), a second push column (94) being horizontally fixedly arranged at a side of the second mounting ring (93) facing the mounting plate (2), the second push columns (94) being arranged in groups of two, and all groups of second push columns (94) being arranged in an array along the circumference of the axis of the second mounting ring (93).

7. A gas sampling device for environmental detection according to claim 6, characterized in that: The placement tank (3) is a closed structure. A first cross block (31) is coaxially fixedly provided on the outer side of the end of the placement tank (3). The first cross block (31) and the first cross groove (52) are tightly fitted and slidably engaged. An electromagnet (32) is fixedly provided on the inner side of the end of the placement tank (3). The electromagnet (32) is electrically connected to a wire (33). The wire (33) extends out of the placement tank (3). The electromagnet (32) can cause the placement tank (3) to absorb the bottom cover (51).

8. A gas sampling device for environmental detection according to claim 7, characterized in that: The height of the collecting tube (4) is equal to the sum of the height of the placement tank (3) extending out of the mounting plate (2) and the height of the bottom cover (51); the outer edge of one end of the collecting tube (4) close to the double-end synchronous sealing linkage mechanism (6) can be connected to the inner side of the cover ring (74) by a sealing thread; the other end of the collecting tube (4) is laterally symmetrically fixed with a push block (41); a groove (42) is formed on the surface of the push block (41); and the second push column (94) penetrates the mounting plate (2) and can be closely and socket-slidably engaged with the groove (42).

9. A gas sampling device for environmental detection according to claim 8, characterized in that: When the second electric telescopic rod (91) is in an initial state and one end of the collection tube (4) is in close contact with the mounting plate (2), the second push column (94) is in close contact with the bottom of the groove (42); after the second electric telescopic rod (91) is extended and stops, the end surface of the collection tube (4) facing the mounting plate (2) is flush with the end surface of the placement tank (3); when the first electric telescopic rod (81) is in an initial state, the slider (631) is completely located in the first annular groove (67); at the moment when the slider (631) is completely in the second annular groove (68), the cover ring (74) and the collection tube (4) begin to be in threaded contact and the cover (76) is screwed to cover the square nut (56); after the slider (631) moves 180 degrees in a circle in the second annular groove (68), the first electric telescopic rod (81) stops extending; the cover ring (74) and the collection tube (4) are relatively rotated 180 degrees to achieve thread sealing.

10. A gas sampling device for environmental detection according to claim 9, characterized in that: The conical sealing pad (54) is made of elastic rubber sealing material.

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