A VOCS concentration detection device

Abstract

The present invention provides a VOCS concentration detection device, which relates to the technical field of VOCS concentration detection. It includes a base, and two sets of shaft rings are fixed on the top of the base. A rotating cylinder is rotatably installed inside the two sets of shaft rings. Three sets of conveying components are arranged inside the rotating cylinder. Each conveying component includes a gas storage pipe. A conveying pipe is installed at the bottom of the tail end of the gas storage pipe. The other end of the conveying pipe is installed with a VOCS detector body at the top. Compared with the prior art, the three detectors can be used alternately for real-time monitoring. The waste gas is collected through the conveying component, and the VOCS concentration in a certain amount of waste gas is detected, which can improve the detection efficiency. The waste gas is pretreated through the conveying pipe to prevent large-particle dust in the waste gas from entering the detector. At the same time, under the action of the driving component, the dust in the waste gas is filtered and centrally collected in the collection box, which is convenient for manual centralized cleaning and avoids blockage in the pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of VOCS concentration detection, and specifically to a VOCS concentration detection device. Background Art

[0002] VOCs (volatile organic compounds) refer to organic compounds with a saturated vapor pressure greater than 133.32 Pa at normal temperature and a boiling point below 50 - 260 °C under normal pressure, or any volatile organic solid or liquid under normal temperature and pressure. The general temperature and time requirements for the spray painting and baking heating and curing processes are 180 - 220 °C and about 15 - 20 minutes. Exhaust gases will be generated during the process, mainly including the following: volatile organic compounds, non-methane total hydrocarbons, inorganic metal oxides (such as titanium dioxide, other pigments), silicon-containing organic compounds (mainly leveling agents, etc.), metal organic compounds, etc. Outdoors, they mainly come from industrial waste gases, vehicle exhausts, photochemical pollution, etc. generated by fuel combustion and transportation; while indoors, they mainly come from combustion products of coal, natural gas, etc., smoking, smokes from heating and cooking, emissions from building and decoration materials, furniture, household appliances, automotive interior parts production, cleaning agents, and the human body itself.

[0003] Currently, the content of VOCs in the exhaust gas of factory production can be detected by a VOCs detector of the prior art. However, for a VOCs detector, it is necessary to rely on a collector to collect the gas and send it into the detector. During the calibration process of the detector, the content of VOCs in the exhaust gas cannot be monitored in real time, resulting in the interruption of the real-time monitoring process. Moreover, the calibration gas needs to be replaced manually during the calibration process, which is inconvenient to use. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a VOCS concentration detection device to solve the problems raised in the above background art. The structure of the present invention is novel. The three groups of detectors can be used alternately for real-time monitoring. The exhaust gas is collected through a conveying component, and the VOCS concentration in a certain amount of exhaust gas is detected, which can improve the detection efficiency. The exhaust gas is pretreated through a conveying pipe to prevent large-particle dust in the exhaust gas from entering the detector. At the same time, under the action of a driving component, the dust in the exhaust gas is filtered and centrally collected in a collection box, which is convenient for manual centralized cleaning and avoids blockage in the pipeline.

[0005] To achieve the above object, the present invention is realized by the following technical solutions: A VOCS concentration detection device includes a base. Two sets of shaft rings are fixed on the top of the base. A rotating cylinder is rotatably installed inside the two sets of shaft rings. Three sets of conveying components are provided inside the rotating cylinder. The conveying component includes a gas storage pipe. A conveying pipe is installed at the bottom of the tail end of the gas storage pipe. The other end of the conveying pipe is fixed with a VOCS detector body at the top. First connecting pipes are fixed at the top of the front end and the bottom of the tail end of the gas storage pipe. And the first connecting pipe at the bottom of the tail end of the gas storage pipe is connected to the conveying pipe. The first connecting pipe at the front end of the gas storage pipe slides along the inner wall of the sealing ring. A driving component is provided inside the gas storage pipe and the conveying pipe. The driving component includes a first plug rod. The first plug rod slides and inserts into the front end of the gas storage pipe. A piston plate is slidably installed inside the gas storage pipe. And the first plug rod is fixedly connected to the piston plate. A retaining ring is slidably connected inside the conveying pipe. Filter plates are fixedly installed at both ends of the retaining ring. The center of the filter plate is rotatably inserted through a bearing with a second plug rod. And the second plug rod slides out from the tail end of the conveying pipe.

[0006] Further, a toothed ring is fixed on the outer surface of the rotating cylinder. A driving motor is fixed on one side of the base. And a gear is fixed at the output end of the driving motor. The gear is meshed with the toothed ring.

[0007] Further, the conveying component further includes a second connecting pipe. The second connecting pipe is fixed at the top of the tail end of the conveying pipe. And the second connecting pipe is fixedly connected to the VOCS detector body. A fixing frame is fixed at the top of the tail end of the gas storage pipe. And the fixing frame is fixedly connected to the VOCS detector body. The VOCS detector body is fixed on the inner wall of the rotating cylinder.

[0008] Further, a first spring is fixed on the inner wall of the front end of the gas storage pipe. And the other end of the first spring is fixedly connected to the piston plate. Scrapers are fixed on the outer surface of the second plug rod between the two filter plates. And the scrapers are in sliding contact with the surface of the filter plates.

[0009] Further, the driving component further includes a connecting frame. Connecting frames are fixed at the outer ends of the first plug rod and the second plug rod. A small motor is fixed on the surface of the connecting frame corresponding to one end of the second plug rod. And the output end of the small motor is fixedly connected to the second plug rod.

[0010] Further, an outer plate is fixed on the back of the small motor. An electric push rod is fixed on the top of the shaft ring. And the extended end of the electric push rod is in pressing contact with the outer plate. A fixing block is fixed between the outer plate and the connecting frame.

[0011] Further, connecting boxes are fixed at both ends of the conveying pipe. Sealing plates are arranged at the positions of the connecting boxes corresponding to the conveying pipe. And a second spring is fixed between the back of the sealing plate and the inner wall of the connecting box.

[0012] Furthermore, a collection box is fixed between the three groups of connection boxes. The connection boxes are communicated with the collection box, and a cover plate is installed on the outer surface of the collection box.

[0013] Furthermore, ejector rods are symmetrically and equidistantly fixed at the front end and the rear end of the retaining ring, and the ejector rods are in pressing contact with the sealing plate.

[0014] Furthermore, a sealing ring is fixed at the position of the base corresponding to the front ends of the three groups of air storage pipes, and an air inlet pipe is arranged at the top of the sealing ring.

[0015] Advantages of the present invention:

[0016] 1. Under the action of the driving component of the present invention, the piston plate moves rightward along the inside of the air storage pipe, and the retaining ring also moves rightward. Through the elastic force of the second spring, the baffle blocks the opening of the connection box. After the first connecting pipe is opened, gas enters the inside of the conveying pipe, and passes through the filter plate, through the conveying pipe and the second connecting pipe into the VOCS detector body. During this process, large-particle impurities in the waste gas will be screened by the filter screen. The surface of the filter plate is cleaned by driving the rotation of the scraper through the second insertion rod. And as the retaining ring moves, the dust adsorbed on the inner wall of the conveying pipe is pushed towards the other connection box. When the retaining ring blocks the second connecting pipe, the ejector rod on the other side of the retaining ring contacts the sealing plate and continues to move to push the sealing plate open. This state is repeated. Through the movement of the retaining ring and the pressing contact between the ejector rod and the sealing plate, the impurities in the conveying pipe and on the surface of the filter plate are pushed into the connection boxes on both sides and then centrally collected in the collection box, which is convenient for people to open the cover plate for unified cleaning, and also avoids the influence on the air supply efficiency due to the accumulation of more impurities in the conveying pipe.

[0017] 2. When the three groups of conveying components and the driving component rotate to the position of the top electric push rod alternately, the push plate of the electric push rod can be moved through the extended end of the electric push rod, and the connecting frame drives the first insertion rod and the second insertion rod to move synchronously. The first insertion rod penetrates into the air storage pipe to push the piston plate to move, and the second insertion rod drives the retaining ring to move along the inside of the conveying pipe. During the process, the small motor is started to drive the second insertion rod to rotate, and the surface of the filter plate can be cleaned.

[0018] 3. The driving motor drives the gear to rotate and engage with the toothed ring of the rotating cylinder, and the rotating cylinder rotates along the shaft ring, which can replace the positions of the three groups of conveying components. The first connecting pipe at the front end of the air storage pipe of the conveying component slides along the sealing ring. When it moves to the position of the air inlet pipe, the first connecting pipe is communicated with the air inlet pipe, and a certain amount of waste gas can be injected into the air storage pipe through the air inlet pipe, and then continue to rotate to seal the first connecting pipe through the inner wall of the sealing ring, which is convenient for transporting the waste gas to the conveying pipe for pretreatment.

[0019] 4. Compared with the prior art, the three groups of detectors can be used alternately for real-time monitoring. The waste gas is collected through the conveying component, and the VOCS concentration in a certain amount of waste gas is detected, which can improve the detection efficiency. The waste gas is pretreated through the conveying pipe to prevent large-particle dust in the waste gas from entering the interior of the detector. At the same time, under the action of the driving component, the dust in the waste gas is filtered and concentrated in the collection box, which is convenient for manual centralized cleaning and avoids blockage in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic front view of the overall structure of a VOCS concentration detection device of the present invention;

[0021] Figure 2 FIG. is a schematic rear view of the overall structure of a VOCS concentration detection device of the present invention;

[0022] Figure 3 FIG. is a schematic internal structure view of the rotating cylinder of a VOCS concentration detection device of the present invention;

[0023] Figure 4 FIG. is a schematic external structure view of the conveying component of a VOCS concentration detection device of the present invention;

[0024] Figure 5 FIG. is a schematic internal structure view of the conveying component of a VOCS concentration detection device of the present invention;

[0025] Figure 6 FIG. is a schematic connection view of the conveying pipe and the connection box of a VOCS concentration detection device of the present invention;

[0026] Figure 7 FIG. is a schematic external structure view of the driving component of a VOCS concentration detection device of the present invention.

[0027] In the figure: 1, base; 11, collar; 12, sealing ring; 13, intake pipe; 2, conveying component; 21, air storage pipe; 22, conveying pipe; 23, VOCS detector body; 24, fixing frame; 25, first connecting pipe; 26, piston plate; 27, first spring; 28, second connecting pipe; 29, retaining ring; 210, filter plate; 211, ejector rod; 212, scraper; 3, driving component; 31, connecting frame; 32, first plug rod; 33, second plug rod; 34, electric push rod; 35, outer plate; 36, small motor; 37, fixing block; 4, driving motor; 41, gear; 42, toothed ring; 5, collection box; 51, cover plate; 52, connection box; 53, sealing plate; 54, second spring; 6, rotating cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0029] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a VOCS concentration detection device, including a base 1, two sets of collar rings 11 are fixed on the top of the base 1, a rotating cylinder 6 is rotatably installed inside the two sets of collar rings 11, three sets of conveying components 2 are arranged inside the rotating cylinder 6, the conveying component 2 includes a gas storage pipe 21, a conveying pipe 22 is installed at the bottom of the tail end of the gas storage pipe 21, and a VOCS detector body 23 is installed at the top of the other end of the conveying pipe 22. First connecting pipes 25 are fixed at the top of the front end and the bottom of the tail end of the gas storage pipe 21, and the first connecting pipe 25 at the bottom of the tail end of the gas storage pipe 21 is connected to the conveying pipe 22. The first connecting pipe 25 at the front end of the gas storage pipe 21 slides along the inner wall of the sealing ring 12. A driving component 3 is arranged inside the gas storage pipe 21 and the conveying pipe 22. The driving component 3 includes a first inserting rod 32, the first inserting rod 32 slides and inserts into the front end of the gas storage pipe 21, a piston plate 26 is slidably installed inside the gas storage pipe 21, and the first inserting rod 32 is fixedly connected to the piston plate 26. A retaining ring 29 is slidably connected inside the conveying pipe 22, filter plates 210 are fixedly installed at both ends of the retaining ring 29, a second inserting rod 33 is rotatably inserted through the center of the filter plate 210 by means of a bearing, and the second inserting rod 33 slides out from the tail end of the conveying pipe 22. When using the device, waste gas is alternately fed into the three sets of conveying components 2 through the air inlet pipe 13, and a fixed amount of waste gas is fed into the VOCS detector body 23 through the cooperation of the driving component 3 and the conveying component 2 for concentration detection. During the detection process of each set of conveying components 2, the remaining unused conveying components 2 are replaced to the topmost position to receive waste gas by the rotation of the rotating cylinder 6, realizing real-time monitoring of waste gas.

[0030] In this embodiment, a toothed ring 42 is fixed on the outer surface of the rotating cylinder 6, a driving motor 4 is fixed on one side of the base 1, and a gear 41 is fixed at the output end of the driving motor 4. The gear 41 is meshed with the toothed ring 42. A sealing ring 12 is fixed at the position corresponding to the front ends of the three sets of gas storage pipes 2 on the base 1, and an air inlet pipe 13 is arranged at the top of the sealing ring 12. When the driving motor 4 is started to drive the gear 41 to rotate and mesh with the toothed ring 42 of the rotating cylinder 6, the rotating cylinder 6 rotates along the collar ring 11, and the positions of the three sets of conveying components 2 can be replaced. The first connecting pipe 25 at the front end of the gas storage pipe 21 of the conveying component 2 slides along the sealing ring 12. When it moves to the position of the air inlet pipe 13, the first connecting pipe 25 is communicated with the air inlet pipe 13, and a fixed amount of waste gas can be injected into the gas storage pipe 21 through the air inlet pipe 13, and then continue to rotate to seal the first connecting pipe 25 through the inner wall of the sealing ring 12, facilitating the transfer of waste gas to the conveying pipe 22 for pretreatment.

[0031] In this embodiment, the conveying assembly 2 further includes a second connecting pipe 28. The top of the tail end of the conveying pipe 22 is fixedly provided with the second connecting pipe 28, and the second connecting pipe 28 is fixedly connected to the VOCS detector body 23. The top of the tail end of the air storage pipe 21 is fixedly provided with a fixing bracket 24, and the fixing bracket 24 is fixedly connected to the VOCS detector body 23. The VOCS detector body 23 is fixed on the inner wall of the rotating cylinder 6. A first spring 27 is fixedly provided on the inner wall of the front end of the air storage pipe 21, and the other end of the first spring 27 is fixedly connected to the piston plate 26. A scraper 212 is fixedly provided on the outer surface of the second plug rod 33 located outside the two filter plates 210, and the scraper 212 is in sliding contact with the surface of the filter plate 210. The VOCS detector body 23 is a prior art, and its technical principle for detecting concentration includes PID technology, electrochemistry technology, FID technology, etc. The air storage pipe 21, the conveying pipe 22 and the VOCS detector body 23 are connected into a whole through the first connecting pipe 25 and the second connecting pipe 28. The connection between the air storage pipe 21 and the conveying pipe 22 can be blocked by the retaining ring 29 in the conveying pipe 22, which is convenient for filling a certain amount of waste gas into the air storage pipe 21, and then sending it into the VOCS detector body 23 after pretreatment through the conveying pipe 22, so as to improve the reduction efficiency.

[0032] In this embodiment, the driving assembly 3 further includes a connecting frame 31. The outer ends of the first plug rod 32 and the second plug rod 33 are fixedly provided with the connecting frame 31. A small motor 36 is fixedly provided on the surface of the connecting frame 31 corresponding to one end of the second plug rod 33, and the output end of the small motor 36 is fixedly connected to the second plug rod 33. An outer plate 35 is fixedly provided on the back of the small motor 36. An electric push rod 34 is fixedly provided on the top of the shaft collar 11, and the extending end of the electric push rod 34 is in pressing contact with the outer plate 35. A fixing block 37 is fixedly provided between the outer plate 35 and the connecting frame 31. When the three groups of conveying assemblies 2 and the driving assembly 3 rotate to the position of the electric push rod 34 at the top alternately, the extending end of the electric push rod 34 can be used to push the outer plate 35 to move. The connecting frame 31 drives the first plug rod 32 and the second plug rod 33 to move synchronously. The first plug rod 32 penetrates into the air storage pipe 21 to push the piston plate 26 to move, and the second plug rod 33 drives the retaining ring 29 to move along the inside of the conveying pipe 22. During the process, the small motor 36 is turned on to drive the second plug rod 33 to rotate, so as to clean the surface of the filter plate 210.

[0033] In this embodiment, connection boxes 52 are fixed at both ends of the conveying pipe 22. A sealing plate 53 is arranged at the position of the connection box 52 corresponding to the conveying pipe 22, and a second spring 54 is fixed between the back surface of the sealing plate 53 and the inner wall of the connection box 52. A collection box 5 is fixed between the three connection boxes 52. The connection box 52 is communicated with the collection box 5, and a cover plate 51 is installed on the outer surface of the collection box 5. The front end and the rear end of the retaining ring 29 are symmetrically and equidistantly fixed with ejector rods 211, and the ejector rods 211 are in pressing contact with the sealing plate 53. The initial state in the conveying pipe 22 is that the retaining ring 29 is located at the connection position of the air storage pipe 21 and the conveying pipe 22, blocking the first connecting pipe 25, which is convenient for a certain amount of waste gas to be stored in the air storage pipe 21. The position where the retaining ring 29 is located is one end of the conveying pipe 22. The baffle of the corresponding connection box 52 is pushed open by the ejector rod 211. Under the action of the driving assembly 3, the piston plate 26 moves to the right along the inside of the air storage pipe 21, and the retaining ring 29 also moves to the right. Due to the elastic force of the second spring 54, the baffle blocks the opening of the connection box 52. After the first connecting pipe 25 is opened, the gas enters the inside of the conveying pipe 22, passes through the filter plate 210, passes through the conveying pipe 22 and the second connecting pipe 28, and enters the VOCS detector body 23. During this process, large-particle impurities in the waste gas are screened by the filter screen. The second insertion rod 33 drives the rotation of the scraper 212 to clean the surface of the filter plate 210. And as the retaining ring 29 moves, the dust adsorbed on the inner wall of the conveying pipe 22 is pushed towards the other connection box 52. When the retaining ring 29 blocks the second connecting pipe 28, the ejector rod 211 on the other side of the retaining ring 29 contacts the sealing plate 53 and continues to move to push open the sealing plate 53. This state is repeated. Through the movement of the retaining ring 29 and the pressing contact between the ejector rod 211 and the sealing plate 53, the impurities in the conveying pipe 22 and on the surface of the filter plate 210 are pushed into the connection boxes 52 on both sides, and then centrally collected in the collection box 5, which is convenient for people to open the cover plate 51 for unified cleaning, and also avoids the accumulation of too many impurities in the conveying pipe 22, which affects the air supply efficiency.

[0034] When using the device, start the driving motor 4 to drive the gear 41 to rotate and engage with the toothed ring 42 of the rotating cylinder 6. The rotating cylinder 6 rotates along the shaft ring 11, and the positions of the three sets of conveying components 2 can be replaced. The first connecting pipe 25 at the front end of the air storage pipe 21 of the conveying component 2 slides along the sealing ring 12. When it moves to the position of the air inlet pipe 13, the first connecting pipe 25 communicates with the air inlet pipe 13, and a fixed amount of waste gas can be injected into the air storage pipe 21 through the air inlet pipe 13. Then continue to rotate to seal the first connecting pipe 25 through the inner wall of the sealing ring 12, which is convenient for transporting the waste gas to the conveying pipe 22 for pretreatment. When the three sets of conveying components 2 and the driving component 3 alternately rotate to the position of the top electric push rod 34, the push plate outer plate 35 at the extending end of the electric push rod 34 can be moved. The connecting frame 31 drives the first insertion rod 32 and the second insertion rod 33 to move synchronously. The first insertion rod 32 penetrates into the air storage pipe 21 to push the piston plate 26 to move, and the second insertion rod 33 drives the retaining ring 29 to move along the inside of the conveying pipe 22. During this process, start the small motor 36 to drive the second insertion rod 33 to rotate, which can clean the surface of the filter plate 210. The initial state in the conveying pipe 22 is that the retaining ring 29 is located at the connection position of the air storage pipe 21 and the conveying pipe 22, blocking the first connecting pipe 25, which is convenient for storing a fixed amount of waste gas in the air storage pipe 21. The position where the retaining ring 29 is located is one end of the conveying pipe 22. The baffle of the corresponding connection box 52 is pushed open by the top rod 211. Under the action of the driving component 3, the piston plate 26 moves to the right along the inside of the air storage pipe 21, and the retaining ring 29 also moves to the right. Through the elastic force of the second spring 54, the baffle blocks the opening of the connection box 52. After the first connecting pipe 25 is opened, the gas enters the inside of the conveying pipe 22 and passes through the filter plate 210, through the conveying pipe 22 and the second connecting pipe 28 into the VOCS detector body 23. During this process, large-particle impurities in the waste gas will be screened by the filter screen. The rotation of the second insertion rod 33 drives the scraper 212 to clean the surface of the filter plate 210. And as the retaining ring 29 moves, the dust adsorbed on the inner wall of the conveying pipe 22 is pushed towards the other connecting box 52. When the retaining ring 29 blocks the second connecting pipe 28, the top rod 211 on the other side of the retaining ring 29 contacts the sealing plate 53 and continues to move to push the sealing plate 53 open. This state is repeated. Through the movement of the retaining ring 29 and the extrusion contact between the top rod 211 and the sealing plate 53, the impurities in the conveying pipe 22 and on the surface of the filter plate 210 are pushed into the two side connecting boxes 52 and centrally collected in the collection box 5, which is convenient for manually opening the cover plate 51 for unified cleaning and also avoids affecting the air supply efficiency due to excessive impurities accumulating in the conveying pipe 22.

[0035] The foregoing shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

[0036] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A VOCS concentration detection device, comprising a base (1), characterized in that: Two groups of shaft rings (11) are fixed on the top of the base (1), and a rotating drum (6) is rotatably mounted inside the two groups of shaft rings (11). Three groups of conveying components (2) are arranged inside the rotating drum (6), and the conveying components (2) include an air storage tube (21). A conveying tube (22) is mounted on the bottom of the tail end of the air storage tube (21), and a VOCS detector body (23) is mounted on the top of the other end of the conveying tube (22). First connecting tubes (25) are fixed on the top of the front end and the bottom of the tail end of the air storage tube (21), and the first connecting tube (25) at the bottom of the tail end of the air storage tube (21) is connected to the conveying tube (22). The first connecting tube (25) at the front end of the air storage tube (21) slides along the inner wall of the sealing ring (12). A driving component (3) is arranged inside the air storage tube (21) and the conveying tube (22), and the driving component (3) includes a first insertion rod (32). The first insertion rod (32) slides along the front end of the air storage tube (21). The gas storage tube (21) is slidably installed with a piston plate (26), and the first insertion rod (32) is fixedly connected to the piston plate (26). The delivery tube (22) is slidably connected with a retaining ring (29), and filter plates (210) are fixedly installed at both ends of the retaining ring (29). A second insertion rod (33) is rotatably inserted at the center of the filter plate (210) through a bearing, and the second insertion rod (33) slides out from the tail end of the delivery tube (22). The delivery assembly (2) also includes a second connecting tube (28), and the second connecting tube (28) is fixedly connected to the top of the tail end of the delivery tube (22), and the second connecting tube (28) is fixedly connected to the VOCS detector body (23). The gas storage tube (21) is fixedly connected with a fixing frame (24) at the top of the tail end, and the fixing frame (24) is fixedly connected to the VOCS detector body (23), and the VOCS detector body (23) is fixed to the inner wall of the rotating drum (6).

2. A VOCS concentration detection device according to claim 1, characterized in that: A gear ring (42) is fixed on the outer surface of the rotating drum (6), a driving motor (4) is fixed on one side of the base (1), and a gear (41) is fixed on the output end of the driving motor (4), and the gear (41) is meshingly connected with the gear ring (42).

3. A VOCS concentration detection device according to claim 1, characterized in that: A first spring (27) is fixed on the inner wall of the front end of the gas storage tube (21), and the other end of the first spring (27) is fixedly connected to the piston plate (26). A scraper (212) is fixed on the outer surfaces of the two filter plates (210) of the second insertion rod (33), and the scraper (212) is in sliding contact with the surface of the filter plate (210).

4. A VOCS concentration detection device according to claim 1, characterized in that: The driving assembly (3) further comprises a connecting frame (31), the connecting frame (31) being fixed to the outer ends of the first plug rod (32) and the second plug rod (33), a small motor (36) being fixed to a surface of the connecting frame (31) corresponding to one end of the second plug rod (33), and an output end of the small motor (36) being fixedly connected to the second plug rod (33).

5. A VOCS concentration detection device according to claim 4, characterized in that: An outer plate (35) is fixed to the back of the small motor (36), an electric push rod (34) is fixed to the top of the collar (11), and an extended end of the electric push rod (34) is in compression contact with the outer plate (35), and a fixing block (37) is fixed between the outer plate (35) and the connecting frame (31).

6. A VOCS concentration detection device according to claim 1, characterized in that: Connecting boxes (52) are fixed at both ends of the delivery tube (22), a sealing plate (53) is provided at a position of the connecting box (52) corresponding to the delivery tube (22), and a second spring (54) is fixed between the back side of the sealing plate (53) and the inner wall of the connecting box (52).

7. A VOCS concentration detection device according to claim 6, characterized in that: A collection box (5) is fixed between the three groups of connection boxes (52); the connection box (52) is in communication with the collection box (5), and a cover plate (51) is installed on the outer surface of the collection box (5).

8. A VOCS concentration detection device according to claim 7, characterized in that: Push rods (211) are fixed symmetrically and equidistantly on the front and rear ends of the retaining ring (29), and the push rods (211) are in compression contact with the sealing plate (53).

9. A VOCS concentration detection device according to claim 1, characterized in that: A sealing ring (12) is fixed to the base (1) at a position corresponding to the front end of the three groups of air storage pipes (21), and an air intake pipe (13) is arranged on the top of the sealing ring (12).

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