A gas sampling device for environmental detection

Abstract

The present invention belongs to the technical field of environmental detection, and specifically discloses a gas sampling device for environmental detection, which includes an installation platform. Above the installation platform, there is a vertical installation disk and a horizontal double-end synchronous sealing linkage mechanism. On one side of the installation disk, placing tanks are horizontally and fixedly arranged in a circumferential array along the axis. A collection cylinder is coaxially and closely sleeved outside each placing tank. At one end of each placing tank away from the installation disk, a bottom sealing mechanism is provided coaxially. The double-end synchronous sealing linkage mechanism is arranged coaxially and at intervals with each placing tank. At one end of each double-end synchronous sealing linkage mechanism close to the placing tank, a top sealing mechanism is provided. On the side of the double-end synchronous sealing linkage mechanism away from the placing tank, a sealing driving mechanism is provided. On the other side of the installation disk, a static sampling driving mechanism is provided. The present invention adopts a static collection and sampling method, without negative pressure driving, avoiding the influence of airflow disturbance on the authenticity of the sample, and without complex pre-preparation work, greatly simplifying the on-site sampling process.

Description

Technical Field

[0001] The present 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 the industrialization process and the increasing frequency of human activities, the problem of environmental pollution has become increasingly severe and has become the focus of global attention. Among them, air pollution poses a serious threat to human health, the ecosystem, 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 ensuring public health.

[0003] Due to the complex composition and large concentration variations of environmental gases, and the fact that many trace gas components have an important impact on the detection results, it is usually necessary to bring the collected gas samples back to the laboratory for detailed analysis using high-precision instrument equipment. This is because the laboratory environment is controllable, which can effectively avoid the interference of external factors, and the laboratory is usually equipped with a variety of advanced analytical instruments that can conduct comprehensive qualitative and quantitative analysis of gas samples. However, there are still some deficiencies in the existing gas sampling technologies in terms of ensuring the representativeness and accuracy of samples, mainly reflected in the following two aspects:

[0004] In order to ensure that the collected gas samples can truly reflect the original composition of the environment to be measured, the following methods are usually adopted in the prior art: syringe sampling and its extensions, which create an initial gas-free space and then inhale the measured gas to avoid the interference of the original gas in the sampling device on the sample; vacuum container sampling and its extensions, which use a container pre-evacuated to a vacuum and rely on negative pressure to inhale the measured gas. The control of the vacuum degree has a greater impact on the sampling results in this method; air pump replacement sampling, which uses an air pump to extract a large amount of the gas to be measured to replace the original gas in the sampling device as much as possible. However, this method consumes a large amount of energy, and the replacement effect is affected by the performance of the air pump and the sampling time; inert gas purging, which uses inert gases such as nitrogen to flush the sampling container multiple times to remove the residual original gas in the container. However, 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 meet the high-precision requirements, which makes the on-site sampling and preparation process complicated and time-consuming.

[0005] 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

[0006] 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.

[0007] 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.

[0008] Further, the double-end synchronous sealing linkage mechanism includes an outer tube horizontally and fixedly arranged on the umbrella-shaped frame. An inner tube is coaxially and closely arranged inside the outer tube in a sliding manner. A sliding column is coaxially and closely arranged inside the inner tube in a sliding manner. A spiral groove is formed on the side surface of the sliding column along the length direction. A limiting head is fixedly arranged on the inner side surface of the inner tube. The limiting head is slidably and cooperatively connected with the spiral groove. A first annular groove and a second annular groove are coaxially formed on the inner side surface of the outer tube near the placement tank. The cross-sectional dimensions of the first annular groove and the second annular groove are the same and they are arranged at intervals. The second annular groove is close to the end of the outer tube. A long groove is vertically and communicatively formed between the first annular groove and the second annular groove. The long grooves are symmetrically arranged. The depth of the long groove is less than the depth of the first annular groove. A slider is symmetrically and fixedly arranged on the side of the sliding column near the placement tank. The slider can be in close sliding cooperation with the long groove. The thickness of the slider is equal to the thickness of the first annular groove. A first follower column is coaxially fixed at the end of the sliding column near the placement tank. A second cross block is coaxially fixed at one end of the first follower column.

[0009] Further, the top sealing mechanism includes a top cover coaxially arranged on one side of the second cross block. A convex block is coaxially fixed on one side of the top cover. A second cross groove is formed on the surface of the convex block. The second cross groove is in close insertion and sliding cooperation with the second cross block. A cover ring is coaxially fixed on the other side edge of the top cover. A second follower column is coaxially fixed on the top cover on the side of the cover ring. A screwing cover is coaxially fixed at one end of the second follower column.

[0010] Further, the bottom sealing mechanism includes a bottom cover coaxially and closely 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 formed on one side surface of the bottom cover. A screw rod is coaxially fixed on the other side of the bottom cover. A conical sealing pad is coaxially and closely arranged on the side of the bottom cover where the screw rod is located. The edge of the conical sealing pad is aligned with the edge of the bottom cover. The tightening end of the conical sealing pad faces away from the bottom cover. A gasket is coaxially and closely arranged on one side of the tightening end of the conical sealing pad. One end of the screw rod passes through the conical sealing pad and the gasket and is threadedly sleeved with a square nut. The square nut can be in close insertion and sliding cooperation with the screwing cover.

[0011] Further, the sealing driving mechanism includes a first electric telescopic rod fixedly arranged at the upper end of the support rod. The output end of the first electric telescopic rod faces the placement tank. A first cross rod is coaxially fixed at the output end of the first electric telescopic rod. A first mounting ring is coaxially fixed on the edge of the first cross rod. A first push column is horizontally fixed on the side of the first mounting ring facing the placement tank. The first push columns are grouped in twos. All groups of first push columns are circumferentially arranged in an array along the axis of the first mounting ring. The two first push columns in each group are fixedly connected to one end of the adjacent inner tube.

[0012] Further, the static sampling driving mechanism includes a second electric telescopic rod, which is fixedly arranged at the upper end of the support rod. The output end of the second electric telescopic rod faces the mounting disc. A second cross bar is coaxially and fixedly arranged at the output end of the second electric telescopic rod. A second mounting ring is coaxially and fixedly arranged at the edge of the second cross bar. A second push post is horizontally and fixedly arranged on the side of the second mounting ring facing the mounting disc. Every two second push posts form a group, and all groups of second push posts are circumferentially and arrayed along the axis of the second mounting ring.

[0013] Further, the placement tank has a closed structure. A first cross block is coaxially and fixedly arranged on the outer side of the end of the placement tank. The first cross block is in close contact and inserted and slidably matched with the first cross groove. An electromagnet is fixedly arranged inside 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 suck the bottom cover.

[0014] Further, the height of the collection cylinder is equal to the sum of the height of the placement tank extending out of the mounting disc and the height of the bottom cover. The outer edge of one end of the collection cylinder close to the double-end synchronous sealing linkage mechanism can be in sealed thread connection with the inner side of the cover ring. Push blocks are symmetrically and fixedly arranged on the side of the other end of the collection cylinder. Grooves are formed on the surfaces of the push blocks. After the second push posts penetrate through the mounting disc, they can be in close contact and inserted and slidably matched with the grooves.

[0015] Further, when the second electric telescopic rod is in the initial state and one end of the collection cylinder is in close contact with the mounting disc, the second push posts are in close contact with the bottom of the grooves. After the second electric telescopic rod extends and stops, the end face of the collection cylinder facing the mounting disc is flush with the end face of the placement tank. When the first electric telescopic rod is in the 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 starts to be in thread contact with the collection cylinder and the screwing cover covers the square nut. After the slider makes a circular motion of 180 degrees in the second annular groove, the first electric telescopic rod stops extending. After the cover ring and the collection cylinder rotate relative to each other by 180 degrees, thread sealing is achieved.

[0016] Further, the conical sealing gasket is made of an elastic rubber sealing material.

[0017] The beneficial effects achieved by the present invention with the above structure are as follows:

[0018] (1) The present invention adopts a unique static sampling method. The second electric telescopic rod drives the second push column to push the sampling cylinder to synchronously extend from the placement tank, forming a closed sampling space together with the bottom cover. This process covers the gas to be measured, rather than the traditional suction method. No negative pressure or air extraction device is used during the entire sampling process. Therefore, no pressure gradient is formed near the sampling port. The extension movement of the sampling cylinder is stable and slow, without exerting additional pushing or pulling effects on the surrounding gas, avoiding the interference of mechanical movement on the air flow. This static sampling method without disturbance and negative pressure maximally preserves the original state of the gas to be measured, avoids affecting the gas composition and particulate matter distribution, ensures the authenticity and representativeness of the collected sample, and provides a reliable guarantee for subsequent precise analysis.

[0019] (2) After the sampling cylinder extends and forms a sampling space, 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 sampling cylinder, and the cooperation between the screwing cover and the square nut, so that the cover ring is thread-sealed with the sampling cylinder. At the same time, the screwing cover drives the square nut to rotate, expanding the conical sealing gasket to closely contact the inner wall of the sampling cylinder, realizing bottom-end sealing. The synchronous sealing design at the top and bottom ensures that the sampling cylinder forms a completely closed space after sampling is completed, isolating the pollution of the external environment and ensuring the integrity and purity of the sample before analysis.

[0020] (3) Before sampling, only need to fix the bottom cover on the placement tank through the cooperation of the first cross slot and the first cross block, adsorb it with an electromagnet, put the sampling cylinder outside the placement tank, and ensure that the second push column is inserted into the groove. Connect the top cover to the double-end synchronous sealing linkage mechanism through the cooperation of the second cross slot and the second cross block. The preparation work of this device is extremely simple, without complex pre-steps such as vacuum pumping and inert gas purging. All connections are simple plugging or magnetic adsorption methods, with fast and convenient operation. This simplified preparation process greatly shortens the on-site sampling time, improves the sampling efficiency, and reduces the operation difficulty. Brief Description of the Drawings

[0021] Figure 1 It is the first three-dimensional structure schematic diagram of a gas sampling device for environmental detection proposed by the present invention.

[0022] Figure 2 It is the second three-dimensional structure schematic diagram of a gas sampling device for environmental detection proposed by the present invention.

[0023] Figure 3 It is the front view of a gas sampling device for environmental detection proposed by the present invention.

[0024] Figure 4 It is the exploded structure schematic diagram of a gas sampling device for environmental detection proposed by the present invention.

[0025] Figure 5 Schematic structural diagram of a double - end synchronous sealing linkage mechanism of a gas sampling device for environmental detection proposed by the present invention.

[0026] Figure 6 Schematic structural diagram of a top - end sealing mechanism of a gas sampling device for environmental detection proposed by the present invention.

[0027] Figure 7 Exploded structural diagram of a bottom - end sealing mechanism of a gas sampling device for environmental detection proposed by the present invention.

[0028] Figure 8 Exploded structural diagram of the positional relationship between a second push column and a groove of a gas sampling device for environmental detection proposed by the present invention.

[0029] Figure 9 is Figure 2 enlarged view of part A in

[0030] Figure 10 Schematic structural diagram of a placement tank of a gas sampling device for environmental detection proposed by the present invention.

[0031] Figure 11 Working principle diagram of a gas sampling device for environmental detection proposed by the present invention.

[0032] Wherein, 1. Installation platform, 11. Support rod, 12. Umbrella - shaped frame, 2. Installation disk, 3. Placement tank, 31. First cross - shaped block, 32. Electromagnet, 33. Wire, 4. Collection cylinder, 41. Pushing block, 42. Groove, 5. Bottom - end sealing mechanism, 51. Bottom cover, 52. First cross - shaped 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. Slide column, 631. Slide block, 64. Spiral groove, 65. Limiting head, 66. First follower column, 661. Second cross - shaped block, 67. First annular groove, 68. Second annular groove, 69. Long groove, 7. Top - end sealing mechanism, 71. Top cover, 72. Protrusion, 73. Second cross - shaped groove, 74. Cover ring, 75. Second follower column, 76. Screwing cover, 8. Sealing driving mechanism, 81. First electric telescopic rod, 82. First cross - shaped rod, 83. First installation ring, 84. First push column, 9. Static sampling driving mechanism, 91. Second electric telescopic rod, 92. Second cross - shaped rod, 93. Second installation ring, 94. Second push column.

[0033] The attached drawings are used to provide further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. Detailed implementation manners

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0036] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 As shown in , the present invention provides a gas sampling device for environmental detection, including an installation platform 1. Above the installation platform 1, there are a vertical installation disk 2 and a horizontal double-end synchronous sealing linkage mechanism 6. On one side of the installation disk 2, placing tanks 3 are horizontally and fixedly arranged in a circumferential array along the axis. A collection cylinder 4 is coaxially and closely sleeved outside each placing tank 3. At one end of each placing tank 3 away from the installation disk 2, there is a bottom sealing mechanism 5. The double-end synchronous sealing linkage mechanisms 6 are coaxially and spaced from each placing tank 3. At one end of each double-end synchronous sealing linkage mechanism 6 close to the placing tank 3, there is a top sealing mechanism 7. On the side of the double-end synchronous sealing linkage mechanism 6 away from the placing tank 3, there is a sealing driving mechanism 8. On the other side of the installation disk 2, there is a static sampling driving mechanism 9. All the double-end synchronous sealing linkage mechanisms 6 are fixedly connected to the installation platform 1 through an umbrella-shaped frame 12 fixedly connected to the inner side. The installation disk 2, the sealing driving mechanism 8, and the static sampling driving mechanism 9 are fixedly connected to the installation platform 1 through a support rod 11 fixedly connected to the lower side.

[0037] The installation platform 1 serves as the foundation of the entire device. The umbrella-shaped frame 12 connects all the double-end synchronous sealing linkage mechanisms 6 to the installation platform 1, and the support rod 11 fixes the installation disk 2, the sealing driving mechanism 8, and the static sampling driving mechanism 9 on the installation platform 1.

[0038] Among them, the double-end synchronous sealing linkage mechanism 6 includes an outer tube 61, which is horizontally and fixedly arranged on the umbrella-shaped frame 12. An inner tube 62 is coaxially and closely slidably arranged inside the outer tube 61. A sliding column 63 is coaxially and closely slidably arranged inside the inner tube 62. A spiral groove 64 is formed on the side surface of the sliding column 63 along the length direction. A limiting head 65 is fixedly arranged on the inner side surface of the inner tube 62. The limiting head 65 is slidably connected with the spiral groove 64 in a matching manner. A first annular groove 67 and a second annular groove 68 are coaxially formed on the inner side surface of the outer tube 61 near the placement tank 3. The cross-sectional dimensions of the first annular groove 67 and the second annular groove 68 are the same and are arranged at intervals. The second annular groove 68 is close to the end of the outer tube 61. A long groove 69 is vertically and communicatively formed between the first annular groove 67 and the second annular groove 68. The long grooves 69 are symmetrically arranged. The depth of the long groove 69 is less than the depth of the first annular groove 67. On the end of the sliding column 63 close to the placement tank 3, sliding blocks 631 are symmetrically and laterally fixedly arranged. The sliding blocks 631 can be in close sliding fit with the long groove 69. The thickness of the sliding blocks 631 is equal to the thickness of the first annular groove 67. A first follower column 66 is coaxially fixedly arranged on the end of the sliding column 63 close to the placement tank 3. A second cross block 661 is coaxially fixedly arranged at one end of the first follower column 66.

[0039] The inner tube 62 and the sliding column 63 slide inside the outer tube 61. The spiral groove 64 on the sliding column 63 cooperates with the limiting head 65 on the inner tube 62 to realize the conversion between the linear motion and the 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 track of the sliding block 631. The sliding block 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.

[0040] 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. A convex block 72 is coaxially fixedly arranged on one side of the top cover 71. A second cross groove 73 is formed on the surface of the convex block 72. The second cross groove 73 is in close socket sliding fit with the second cross block 661. A cover ring 74 is coaxially fixedly arranged on the other side edge of the top cover 71. A second follower column 75 is coaxially fixedly arranged on the top cover 71 on the side of the cover ring 74. A screwing cover 76 is coaxially fixedly arranged at one end of the second follower column 75.

[0041] The top cover 71 is connected with the second cross block 661 through the second cross groove 73 on the convex block 72 to realize the transmission of rotational motion. The cover ring 74 is used for threaded connection with the collection cylinder 4 to realize sealing. The second follower column 75 and the screwing cover 76 are used to transmit rotational motion and connect the bottom sealing mechanism 5.

[0042] Among them, the bottom sealing mechanism 5 includes a bottom cover 51. The bottom cover 51 is coaxially and closely arranged at one end of the placement tank 3. 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 one side surface of the bottom cover 51. A screw rod 53 is coaxially and fixedly arranged on the other side of the bottom cover 51. A conical sealing gasket 54 is coaxially and closely arranged on the side of the bottom cover 51 where the screw rod 53 is located. The edge of the conical sealing gasket 54 is aligned with the edge of the bottom cover 51. The tightening end of the conical sealing gasket 54 faces away from the bottom cover 51. A gasket 55 is coaxially and closely arranged on one side of the tightening end of the conical sealing gasket 54. One end of the screw rod 53 passes through the conical sealing gasket 54 and the gasket 55 and is threadedly sleeved with a square nut 56. The square nut 56 can be in close contact, inserted, and slidably mated with the screwing cover 76.

[0043] The bottom cover 51 is fixed through the cooperation of the first cross groove 52 and the first cross block 31 on the placement tank 3. The screw rod 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 will push the gasket 55 and the conical sealing gasket 54. The middle part of the conical sealing gasket 54 is squeezed, causing the edge of the conical sealing gasket 54 to expand outwards, so as to be in close contact with the inner wall of the collection cylinder 4 to achieve sealing. The screwing cover 76 cooperates with the square nut 56 to drive the square nut 56 to rotate.

[0044] Among them, the sealing driving mechanism 8 includes a first electric telescopic rod 81. The first electric telescopic rod 81 is fixedly arranged at the upper end of the support rod 11. The output end of the first electric telescopic rod 81 faces the placement tank 3. A first cross rod 82 is coaxially fixed at the output end of the first electric telescopic rod 81. A first mounting ring 83 is coaxially fixed at the edge of the first cross rod 82. A first push post 84 is horizontally fixed on the side of the first mounting ring 83 facing the placement tank 3. Every two first push posts 84 form a group. All groups of first push posts 84 are circumferentially arranged in an array along the axis of the first mounting ring 83. One end of each group of two first push posts 84 is fixedly connected to the adjacent inner tube 62.

[0045] The first push post 84 pushes the inner tube 62 to move, thereby driving the double-end synchronous sealing linkage mechanism 6 to work. The grouping and arrangement method of the first push posts 84 ensure the synchronous movement of multiple double-end synchronous sealing linkage mechanisms 6.

[0046] Among them, the static sampling driving mechanism 9 includes a second electric telescopic rod 91. The second electric telescopic rod 91 is fixedly arranged at the upper end of the support rod 11. The output end of the second electric telescopic rod 91 faces the mounting disc 2. A second cross rod 92 is coaxially fixed at the output end of the second electric telescopic rod 91. A second mounting ring 93 is coaxially fixed at the edge of the second cross rod 92. A second push post 94 is horizontally fixed on the side of the second mounting ring 93 facing the mounting disc 2. Every two second push posts 94 form a group. All groups of second push posts 94 are circumferentially arranged in an array along the axis of the second mounting ring 93.

[0047] The second push rod 94 is used to push the collection cylinder 4 to realize the extension of the collection cylinder 4. The grouping and arrangement mode of the second push rod 94 ensure the synchronous movement of multiple collection cylinders 4.

[0048] Among them, the placement tank 3 has a closed structure. A first cross block 31 is coaxially and fixedly arranged on the outer side of the end of the placement tank 3. The first cross block 31 is in close contact and plug-in sliding fit with the first cross groove 52. An electromagnet 32 is fixedly arranged 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 suck the bottom cover 51.

[0049] The electromagnet 32 is used to suck the bottom cover 51 in the initial state, which is convenient for installation and disassembly.

[0050] Among them, the height of the collection cylinder 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 collection cylinder 4 close to the double-end synchronous sealing linkage mechanism 6 can be in sealed thread connection with the inner side of the cover ring 74. On the other side of the collection cylinder 4, push blocks 41 are symmetrically fixed. Grooves 42 are formed on the surfaces of the push blocks 41. After the second push rod 94 penetrates through the mounting plate 2, it can be in close contact and plug-in sliding fit with the grooves 42.

[0051] The push blocks 41 and the grooves 42 are used to cooperate with the second push rod 94 to realize the extension of the collection cylinder 4.

[0052] Among them, when the second electric telescopic rod 91 is in the initial state and one end of the collection cylinder 4 is in close contact with the mounting plate 2, the second push rod 94 is in close contact with the bottom of the groove 42. After the second electric telescopic rod 91 extends and stops, the end face of the collection cylinder 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 ring groove 67. The moment the slider 631 completely enters the second ring groove 68, the cover ring 74 starts to be in thread contact with the collection cylinder 4 and the screwing cover 76 covers the square nut 56. After the slider 631 makes a circular motion of 180 degrees in the second ring groove 68, the first electric telescopic rod 81 stops extending. After the cover ring 74 and the collection cylinder 4 rotate relative to each other by 180 degrees, thread sealing is achieved.

[0053] The second electric telescopic rod 91 controls the extension of the collection cylinder 4. The first electric telescopic rod 81 controls the movement of the double-end synchronous sealing linkage mechanism 6. The movement trajectories of the slider 631 in the first ring groove 67, the long groove 69 and the second ring groove 68 control the thread connection between the cover ring 74 and the collection cylinder 4 and the cooperation between the screwing cover 76 and the square nut 56, thus realizing the synchronous sealing at both ends of the collection cylinder 4.

[0054] Among them, the conical sealing gasket 54 is made of elastic rubber sealing material.

[0055] The elastic rubber sealing material has good elasticity and sealing performance, which can ensure the sealing effect of the collection cylinder 4.

[0056] The specific working process is as follows:

[0057] 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 site, ensure that both the first electric telescopic rod 81 and the second electric telescopic rod 91 are in the initial contracted state. Align and fit all the first cross grooves 52 of the bottom covers 51 onto the first cross blocks 31 at the ends of the corresponding placement cans 3. Since the first cross groove 52 and the first cross block 31 are in a tight socket sliding fit, this ensures the preliminary fixation and centering of the bottom cover 51 and the placement can 3. Turn on the electromagnets 32 inside all the placement cans 3. The magnetic force generated after the electromagnets 32 are energized adsorbs the bottom cover 51 at the end of the placement can 3, preventing the bottom cover 51 from accidentally falling off during subsequent operations. Put each collection cylinder 4 outside the placement can 3, push the collection cylinder 4 towards the mounting disc 2, and confirm that all the second push columns 94 are fully inserted into the corresponding grooves 42 to ensure the connection and alignment of the collection cylinder 4 and the static sampling driving mechanism 9. Align and fit all the second cross grooves 73 of the top covers 71 onto the corresponding second cross blocks 661. This connection can also adopt a magnetic attraction structure to increase the connection stability. Move the entire device to the environmental area to be detected through the mobile device and the lifting device.

[0058] Sampling stage: Place the device at the position to be measured, ensure that all placement tanks 3 can surround the points to be measured. After standing for a period of time to ensure the stability of the air in the detection area, start the second electric telescopic rod 91 of the static sampling drive mechanism 9. The second electric telescopic rod 91 extends, and all collection cylinders 4 are pushed synchronously away from the mounting plate 2 by 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 cylinder 4 facing the mounting plate 2 is flush with the end face of the corresponding placement tank 3. At this time, the collection cylinder 4 and the bottom cover 51 together form a space for collecting the gas to be measured. Start the first electric telescopic rod 81, and through the first push column 84, all inner tubes 62 are pushed forward synchronously. In the initial stage of the movement of the inner tube 62, the slider 631 will enter the long groove 69 on the inner wall of the outer tube 61. Due to the limitation of the long groove 69, the slider 631 can only move linearly along the axial direction of the long groove 69 at this time. 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 sliding column 63 cooperates with the limiting head 65 on the inner tube 62 to convert the linear movement of the inner tube 62 into the linear movement of the sliding column 63. As the first electric telescopic rod 81 continues to extend, the slider 631 will completely enter the second annular groove 68 on the inner wall of the outer tube 61. Since the thickness of the slider 631 is equal to the thickness of the first annular groove 67 and the second annular groove 68, at the moment when the slider 631 enters the second annular groove 68, it will be blocked by the front end face of the second annular groove 68 and cannot continue to move linearly. At this time, the cover ring 74 on the top cover 71 just starts to make thread contact with one end of the collection cylinder 4, and at the same time, the screwing cover 76 just covers the square nut 56. Subsequently, the first electric telescopic rod 81 is still extending, and the inner tube 62 also continues to move forward. The cooperation relationship between the spiral groove 64 on the sliding column 63 and the limiting head 65 on the inner tube 62 forces the sliding column 63 to start rotating. Since the slider 631 is located in the second annular groove 68, the slider 631 can rotate freely and no longer restricts the sliding column 63. The rotation of the sliding column 63 drives the top cover 71 to rotate. After the cover ring 74 rotates 180 degrees relative to the collection cylinder 4, the top end is hermetically sealed by threads. At the same time, the second follower column 75 drives the screwing cover 76 to rotate, thereby driving 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, and 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 cylinder 4 to achieve the bottom sealing.

[0059] Sampling End and Sample Retrieval: The first electric telescopic rod 81 starts to retract. The slider 631 first retracts from the second annular groove 68 back into the long groove 69. Due to the limitation 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. The slider 631 enters the first annular groove 67. The first electric telescopic rod 81 continues to retract. Under the cooperation of the limit head 65 and the spiral groove 64, the slider 631 rotates reversely by 180 degrees in a circular motion 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 the electromagnets 32 are turned off, and the adsorption force on the bottom cover 51 is released. Each sealed sampling cylinder 4 is removed. Since both ends of the sampling cylinder 4 are sealed, the gas sample inside will not leak or be contaminated. Then the second electric telescopic rod 91 is retracted. At this time, all the mechanisms have completely returned to the initial state, ensuring that the initial state of the device during the next sampling is the same as this time.

[0060] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0061] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

[0062] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A gas sampling device for environmental detection, comprising an installation platform (1), characterized in that: Above the installation platform (1), there is a vertical installation disk (2) and a horizontal double-end synchronous sealing linkage mechanism (6). On one side of the installation disk (2), placing tanks (3) are horizontally and fixedly arranged in a circumferential array along the axis. A collection cylinder (4) is coaxially and closely sleeved outside each placing tank (3). At one end of each placing tank (3) away from the installation disk (2), there is a bottom sealing mechanism (5). The double-end synchronous sealing linkage mechanism (6) is arranged coaxially and at intervals with each placing tank (3). At one end of each double-end synchronous sealing linkage mechanism (6) close to the placing tank (3), there is a top sealing mechanism (7). On the side of the double-end synchronous sealing linkage mechanism (6) away from the placing tank (3), there is a sealing driving mechanism (8). On the other side of the installation disk (2), there is a static sampling driving mechanism (9). All the double-end synchronous sealing linkage mechanisms (6) are fixedly connected to the installation platform (1) through an umbrella-shaped frame (12) fixedly connected to the inner side. The installation disk (2), the sealing driving mechanism (8), and the static sampling driving mechanism (9) are fixedly connected to the installation platform (1) through a support rod (11) fixedly connected to the lower side; The bottom sealing mechanism (5) includes a bottom cover (51). The bottom cover (51) is coaxially and closely arranged at one end of the placing tank (3). The diameter of the bottom cover (51) is equal to the outer diameter of the placing tank (3). On one side surface of the bottom cover (51), a first cross groove (52) is coaxially opened. On the other side of the bottom cover (51), a screw rod (53) is coaxially fixed. A conical sealing pad (54) is coaxially and closely arranged on the side of the bottom cover (51) beside the screw rod (53). The edge of the conical sealing pad (54) is aligned with the edge of the bottom cover (51). The tightening end of the conical sealing pad (54) faces away from the bottom cover (51). A gasket (55) is coaxially and closely arranged on the side of the tightening end of the conical sealing pad (54). One end of the screw rod (53) passes through the conical sealing pad (54) and the gasket (55) and is threadedly sleeved with a square nut (56); The height of the collection cylinder (4) is equal to the sum of the height of the placing tank (3) extending out of the installation disk (2) and the height of the bottom cover (51); During sampling, the static sampling driving mechanism (9) pushes the collection cylinder (4) to synchronously extend out of the placing tank (3) to jointly form a closed sampling space with the bottom cover (51); The double-end synchronous sealing linkage mechanism (6) drives the top sealing mechanism (7) and the bottom sealing mechanism (5) to act to achieve synchronous sealing of the top and bottom ends of the collection cylinder (4).

2. The gas sampling device for environmental detection according to claim 1, wherein: The double-end synchronous sealing linkage mechanism (6) includes an outer tube (61). The outer tube (61) is horizontally and fixedly arranged on the umbrella-shaped frame (12). An inner tube (62) is coaxially and closely arranged inside the outer tube (61) in a sliding manner. A sliding column (63) is coaxially and closely arranged inside the inner tube (62) in a sliding manner. A spiral groove (64) is formed on the side surface of the sliding column (63) along the length direction. A limiting head (65) is fixedly arranged on the inner side surface of the inner tube (62). The limiting head (65) is slidably and cooperatively connected with the spiral groove (64). On the inner side surface of the outer tube (61) near the placement tank (3), a first annular groove (67) and a second annular groove (68) are coaxially formed. The cross-sectional dimensions of the first annular groove (67) and the second annular groove (68) are the same and they are arranged at intervals. The second annular groove (68) is close to the end of the outer tube (61). A long groove (69) is vertically and communicatively formed between the first annular groove (67) and the second annular groove (68). The long grooves (69) are symmetrically arranged. The depth of the long groove (69) is less than the depth of the first annular groove (67). On one end of the sliding column (63) near the placement tank (3), sliding blocks (631) are symmetrically and fixedly arranged on the side. The sliding blocks (631) can be closely and slidably cooperated with the long groove (69). The thickness of the sliding blocks (631) is equal to the thickness of the first annular groove (67). On one end of the sliding column (63) near the placement tank (3), a first follower column (66) is coaxially fixed. One end of the first follower column (66) is coaxially fixed with a second cross block (661).

3. The gas sampling device for environmental detection according to claim 2, wherein: The top sealing mechanism (7) includes a top cover (71). The top cover (71) is coaxially arranged on one side of the second cross block (661). A convex block (72) is coaxially fixed on one side of the top cover (71). A second cross groove (73) is formed on the surface of the convex block (72). The second cross groove (73) is closely and slidably cooperated with the second cross block (661) in an inserting manner. On the other side edge of the top cover (71), a cover ring (74) is coaxially fixed. On the side of the cover ring (74) of the top cover (71), a second follower column (75) is coaxially fixed. One end of the second follower column (75) is coaxially fixed with a screwing cover (76).

4. The gas sampling device for environmental detection according to claim 3, characterized in that: The square nut (56) can be closely and slidably cooperated with the screwing cover (76) in an inserting manner.

5. The gas sampling device for environmental detection according to claim 4, characterized in that: The sealing driving mechanism (8) includes a first electric telescopic rod (81). The first electric telescopic rod (81) is fixedly arranged at the upper end of the support rod (11). The output end of the first electric telescopic rod (81) faces the placement tank (3). A first cross rod (82) is coaxially fixed at the output end of the first electric telescopic rod (81). A first mounting ring (83) is coaxially fixed on the edge of the first cross rod (82). A first pushing column (84) is horizontally fixed on the side of the first mounting ring (83) facing the placement tank (3). The first pushing columns (84) are grouped in twos. All groups of the first pushing columns (84) are circumferentially arranged in an array along the axis of the first mounting ring (83). The two first pushing columns (84) in each group are fixedly connected with one end of the adjacent inner tube (62).

6. The gas sampling device for environmental detection according to claim 5, wherein: The static sampling driving mechanism (9) includes a second electric telescopic rod (91). The second electric telescopic rod (91) is fixedly arranged at the upper end of the support rod (11). The output end of the second electric telescopic rod (91) faces the mounting plate (2). A second cross rod (92) is coaxially and fixedly arranged at the output end of the second electric telescopic rod (91). A second mounting ring (93) is coaxially and fixedly arranged at the edge of the second cross rod (92). A second push column (94) is horizontally and fixedly arranged on the side of the second mounting ring (93) facing the mounting plate (2). Every two of the second push columns (94) form a group, and all groups of the second push columns (94) are circumferentially and arrayed along the axis of the second mounting ring (93).

7. The gas sampling device for environmental detection according to claim 6, wherein: The placement tank (3) has a closed structure. A first cross block (31) is coaxially and fixedly arranged on the outer side of the end of the placement tank (3). The first cross block (31) is in tight plug-and-sliding fit with the first cross groove (52). An electromagnet (32) is fixedly arranged 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) suck the bottom cover (51).

8. An air sampling device for environmental detection according to claim 7, characterized in that: The outer edge of one end of the collection cylinder (4) close to the double-end synchronous sealing linkage mechanism (6) can be in sealed threaded connection with the inner side of the cover ring (74). On the other side of the collection cylinder (4), push blocks (41) are symmetrically and fixedly arranged on the side. Grooves (42) are formed on the surfaces of the push blocks (41). After the second push column (94) penetrates the mounting plate (2), it can be in tight plug-and-sliding fit with the grooves (42).

9. The gas sampling device for environmental detection according to claim 8, wherein: When the second electric telescopic rod (91) is in the initial state and one end of the collection cylinder (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) extends and stops, the end face of the collection cylinder (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 be in threaded contact with the collection cylinder (4) and the screwing cover (76) covers the square nut (56). After the slider (631) moves circularly 180 degrees in the second annular groove (68), the first electric telescopic rod (81) stops extending. After the cover ring (74) and the collection cylinder (4) rotate relative to each other by 180 degrees, threaded sealing is achieved.

10. The gas sampling device for environmental detection according to claim 9, wherein: The conical sealing gasket (54) is made of an elastic rubber sealing material.

Images