A VOC environmental monitoring device with multi-layer sampling function

Abstract

This invention discloses a VOC environmental detection device with multi-layer sampling function, belonging to the field of environmental detection technology. It includes a base, a power unit, a switching device, a sampling device, a transport device, and a detection box. The switching device can switch between lifting and lowering the sampling platform and taking samples. The sampling device can perform stratified sampling of VOC concentrations at different heights, obtaining more comprehensive and three-dimensional environmental VOC concentration distribution data, avoiding data distortion caused by sampling at a single height. It also enables automated monitoring, reducing manual workload and improving data acquisition efficiency and monitoring accuracy. After completing VOC concentration collection at a certain sampling point, the transport device can clean the detection box, preventing residues from the previous sampling from interfering with subsequent sampling results, effectively reducing cross-contamination between multiple samplings, and ensuring the independence and accuracy of each VOC concentration detection result.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring technology, specifically a VOC environmental monitoring device with multi-layer sampling function. Background Technology

[0002] VOCs are a class of organic compounds that are easily volatilized under normal temperature and pressure. Excessive VOC emissions not only cause indoor and outdoor air pollution, forming photochemical smog and ozone pollution, but also harm human health. Real-time monitoring and control of VOC concentrations has become an important requirement for industrial production, public places, and environmental supervision.

[0003] Existing VOC environmental monitoring devices have some problems: most existing detection devices can only sample air at a single point, which cannot provide a more comprehensive understanding of the current atmospheric environment and requires manual adjustment of the detection location; after sampling, VOCs remain in the detection chamber, leading to cross-contamination of the samples. Residue from previous sampling can interfere with subsequent sampling results, making the detection results inaccurate. Summary of the Invention

[0004] The purpose of this invention is to provide a VOC environmental detection device with multi-layer sampling function to solve the problems of single detection location and cross-contamination of samples in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A VOC environmental detection device includes a base, a power unit is installed on the base, a sampling device is installed on one side of the power unit, a switching device is installed on the sampling device, a transport device is installed on one side of the sampling device, a detection box is installed on the transport device, and the power unit is connected to a control system.

[0006] The switching device includes a worm gear mounted on a power unit. A protective shell is mounted on the sampling device. A first chassis and a second chassis are installed inside the protective shell. A first clutch device is rotatably mounted on the first chassis. A first gear is mounted on the first clutch device. A first worm wheel is rotatably mounted on the first clutch device. A first limit block is installed inside the first worm wheel. The worm gear and the first worm wheel mesh. A second clutch device is rotatably mounted on the second chassis. A second gear is mounted on the second clutch device. A second worm wheel is rotatably mounted on the second clutch device. A second limit block is installed inside the second worm wheel. The worm gear and the second worm wheel mesh. A cylinder is mounted above the protective shell. A mounting plate is mounted on the cylinder rod of the cylinder. A first pin is mounted on one side of the mounting plate, and a second pin is mounted on the other side of the mounting plate. The cylinder is connected to the control system. The power unit is an electric motor. The motor starts, and its output shaft drives a worm gear to rotate. The worm gear drives the first and second worm wheels to rotate. When a higher elevation is needed, the cylinder rod extends, pushing the mounting plate closer to the first worm wheel. The mounting plate then moves the first and second pins closer to the first worm wheel. The first limit block drives the first rotating disk to rotate, which in turn drives the first shaft to rotate. The first shaft drives the first gear to rotate, and the first gear drives the third gear to rotate. When sampling is needed, the cylinder rod retracts, pushing the mounting plate away from the first worm wheel. The mounting plate then moves the first and second pins away from the first worm wheel. The second limit block drives the second rotating disk to rotate, which in turn drives the second shaft to rotate. The second shaft drives the second gear to rotate, and the second gear drives the fourth gear to rotate.

[0007] The first clutch device includes a first rotating shaft that rotates on a first chassis. A first gear rotates on the first rotating shaft. A first rotating disk is mounted on one side of the first rotating shaft. The interior of the first rotating disk has a first sliding groove. One side of the first sliding groove has a first recess. A first pin slides within the first sliding groove. A first wedge block is slidably mounted within the first recess. A first protrusion is mounted on one side of the first wedge block. A first spring is sleeved on the outer side of the first protrusion. One side of the first spring is mounted on the first wedge block, and the other side of the first spring is mounted on the inner wall of the first recess. When the first pin moves closer to the first worm gear, the first pin slides within the first sliding groove. The first pin drives the first wedge block to move within the first recess. The first wedge block moves away from the first pin, and the first wedge block drives the first protrusion to move away from the first pin. A first limiting block engages with the first protrusion.

[0008] The second clutch device includes a second rotating shaft that rotates on a first chassis. A second gear rotates on the second rotating shaft. A second rotating disk is mounted on one side of the second rotating shaft. The interior of the second rotating disk has a second sliding groove. A second recess is provided on one side of the second sliding groove. A third sliding groove is provided on one side of the second recess. A second pin slides within the second and third sliding grooves. A second wedge block is slidably mounted within the second recess. A second protrusion is mounted on one side of the second wedge block. A second spring is sleeved on the outer side of the second protrusion. One side of the second spring is mounted on the second wedge block, and the other side of the second spring is mounted on the inner wall of the second recess. When the second pin moves away from the first worm gear, the second pin slides within the second sliding groove. The second pin drives the second wedge block to move within the second recess. The second wedge block moves away from the second pin, driving the second protrusion to move away from the second pin. The second limiting block engages with the second protrusion.

[0009] The sampling device includes a lower plate mounted on a base, a protective shell mounted on the lower plate, and a first fixed cylinder and a second fixed cylinder mounted on the lower plate. A third rotating shaft is rotatably mounted inside the first fixed cylinder, and a third gear is mounted on the third rotating shaft, meshing with the first gear. A lead screw is connected to one side of the third rotating shaft, a guide rod is mounted to one side of the second fixed cylinder, and an upper plate is mounted to one side of the guide rod. A trigger block is mounted on the outer side of the guide rod. A sampling platform is slidably mounted on the lead screw and slides along the guide rod. The third gear drives the third rotating shaft to rotate, the third rotating shaft drives the lead screw to rotate, and the lead screw moves the sampling platform along the lead screw towards the upper plate.

[0010] The sampling platform includes a sliding plate that slides on a lead screw and a guide rod. A triggering device is installed on one side of the sliding plate, and a lever is rotatably installed on one side of the triggering device. A support rod is installed on the sliding plate, and the lever rotates around the support rod. An air extraction device is rotatably installed on the other side of the lever, and a sealing shell is installed on the outside of the lever. The sealing shell is installed on the sliding plate.

[0011] The triggering device includes a housing, which is mounted on a sliding plate. A guide groove is provided on the housing, and a trigger groove is provided on one side of the guide groove. A trigger plate is slidably installed in the trigger groove. A guide post is installed on one side of the trigger plate, and a third spring is sleeved on the outside of the guide post. One side of the third spring is installed on the trigger plate, and the other side of the third spring is installed on the inner wall of the trigger groove. A connecting block is connected to the outside of the trigger plate, and a lever rotates on the connecting block. A rotating groove is provided on the trigger plate, and a fourth rotating shaft is rotatably installed in the rotating groove. A rotating plate is installed on the fourth rotating shaft, and a torsion spring is installed on the fourth rotating shaft. When upward movement is required, the trigger block on the guide rod slides within the guide groove until it abuts against the rotating plate. The trigger block then drives the rotating plate to slide closer to the sliding plate. The rotating plate, in turn, drives the trigger plate to slide within the trigger groove. The trigger plate, in turn, drives the connecting block to slide closer to the sliding plate. The connecting block drives the lever to rotate around the support rod, amplifying the pressure of the connecting block. The lever then drives the extension plate to slide away from the sliding plate, stopping the control motor. When further upward movement is required, the control motor restarts. At this point, the trigger block drives the rotating plate to overcome the spring force of the torsion spring, causing the rotating plate to rotate. The trigger block then leaves the rotating plate. The rotating plate then resets under the spring force of the torsion spring, and the trigger plate resets under the spring force of the third spring. The trigger block slides out of the housing and leaves the sliding plate.

[0012] The air extraction device includes an air extraction box mounted on a sliding plate. A first air inlet pipe is installed on one side of the air extraction box. A connecting pipe is installed above the air extraction box, and a top plate is installed on one side of the connecting pipe. A support plate is slidably mounted on the outside of the connecting pipe, and an extension plate is installed on one side of the support plate. One side of a lever rotates on the extension plate, and a connecting column is installed on the other side of the support plate. A sealing cover is installed on one side of the connecting column, and a sealing block is installed on one side of the sealing cover. The sealing block slides inside the connecting pipe. A pressure sensor is installed on one side of the top plate and is connected to the control system. The extension plate drives the support plate to slide on the connecting pipe. As the support plate slides away from the sliding plate, it drives the connecting column to move away from the sliding plate. The connecting column then drives the sealing cover to move away from the sliding plate. At this point, the sealing block leaves the connecting pipe, and the support plate presses against the pressure sensor on one side of the top plate. Upon sensing the pressure, the pressure sensor controls the cylinder to retract.

[0013] The transport device includes a short plate, which is mounted on a base. A mounting column is mounted on the short plate, and a detection box is mounted on the mounting column. A long plate is mounted on one side of the mounting column. A fifth rotating shaft is rotatably mounted between the short plate and the long plate. A fourth gear is mounted on the fifth rotating shaft. The fourth gear meshes with the second gear. A ventilation device is mounted on one side of the long plate.

[0014] The ventilation device includes a first connecting rod mounted on a fifth rotating shaft. A second connecting rod is rotatably mounted on one side of the first connecting rod, and a push rod is rotatably mounted on one side of the second connecting rod. A push plate is mounted on one side of the push rod, and a ventilation box is mounted on the long plate. The push plate slides inside the ventilation box. A first and second exhaust pipes are mounted on one side of the ventilation box, and an exhaust pipe is mounted at one end of the ventilation box. The first exhaust pipe and the first intake pipe are connected by a pipe, and the second exhaust pipe and the detection box are connected by a pipe. A first electric valve is installed in the first exhaust pipe, a second electric valve is installed in the second exhaust pipe, and a third electric valve is installed in the exhaust pipe. The first, second, and third electric valves are connected to the control system. The fourth gear drives the fifth shaft to rotate, the fifth shaft drives the first connecting rod to rotate, and the first connecting rod drives the second connecting rod to rotate. When the second connecting rod drives the push rod to move closer to the fifth shaft, the push rod drives the push plate to slide within the air exchange box. At this time, the first electric valve is activated, and the second and third electric valves are closed. The connecting pipe then draws sampling gas from the outside, and the sampling gas enters the air exchange box through the first outlet pipe. When the second connecting rod drives the push rod to move away from the fifth shaft, the push rod drives the push plate to slide within the air exchange box. At this time, the second electric valve is activated, and the first and third electric valves are closed. The sampled gas in the ventilation box is pushed into the detection box through the second outlet pipe. The control motor stops, and the detection box detects the concentration of the sampled gas. After the detection is completed, the control motor starts again, and the second linkage drives the push rod to move closer to the fifth rotating shaft. At this time, the control second electric valve starts, and the first and third electric valves close. The sampled gas in the detection box is drawn into the ventilation box through the second outlet pipe. The second linkage drives the push rod to move away from the fifth rotating shaft. At this time, the control third electric valve starts, and the first and second electric valves close. The sampled gas in the ventilation box is discharged from the exhaust pipe, clearing the residual gas sample and avoiding interference from the previous sampling results.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention uses automatic lifting technology to drive the sampling probe to automatically lift and lower in the vertical direction, and to perform stratified sampling of VOC concentration in spaces at different heights. This can obtain more comprehensive and three-dimensional environmental VOC concentration distribution data, avoid data distortion caused by sampling at a single height, and at the same time realize automated monitoring, reduce the workload of manual operation, and improve data acquisition efficiency and monitoring accuracy.

[0017] 2. This invention uses backflushing cleaning technology, which can clean the detection chamber after collecting VOC concentration data at a certain sampling point, remove residual gas samples, avoid interference from previous sampling residues with subsequent sampling results, effectively reduce cross-contamination between multiple samplings, and ensure the independence and accuracy of each VOC concentration detection result. Attached Figure Description

[0018] Figure 1 This is a perspective view of the VOC environmental detection device of the present invention;

[0019] Figure 2 This is a perspective view of the switching device of the present invention;

[0020] Figure 3 This is a cross-sectional view of the first clutch device of the present invention;

[0021] Figure 4 This is a cross-sectional view of the second clutch device of the present invention;

[0022] Figure 5 This is a perspective view of the sampling device of the present invention;

[0023] Figure 6 This is an exploded view of the sampling platform of the present invention;

[0024] Figure 7 This is an exploded view of the triggering device of the present invention;

[0025] Figure 8 This is an exploded view of the air extraction device of the present invention;

[0026] Figure 9 This is a perspective view of the transport device of the present invention;

[0027] Figure 10 This is a perspective view of the ventilation device of the present invention.

[0028] In the diagram: 1. Base; 2. Power unit; 3. Switching device; 31. First worm gear; 32. First clutch device; 321. First rotating shaft; 322. First rotating disk; 323. First wedge block; 324. First protruding rod; 325. First sliding groove; 33. First gear; 34. Second worm gear; 35. Second clutch device; 351. Second rotating shaft; 352. Second rotating disk; 353. Second wedge block; 354. Second protruding rod; 355. Second sliding groove; 356. Third sliding groove; 36. Second gear; 37. Cylinder; 38. First pin; 39. Second pin; 4. Sampling device; 41. Lower plate; 42. First fixed cylinder; 43. Third gear; 44. Lead screw; 45. Guide rod; 46. Trigger block; 47. Sampling platform; 471. Sliding plate; 472. Trigger device; 472 1. Outer shell; 4722. Guide groove; 4723. Trigger groove; 4724. Trigger plate; 4725. Third spring; 4726. Connecting block; 4727. Rotating plate; 473. Sealing shell; 474. Lever; 475. Support rod; 476. Air extraction device; 4761. Air extraction box; 4762. Connecting pipe; 4763. Support plate; 4764. Connecting column; 4765. Sealing cover; 476 6. Sealing block; 4767. Pressure sensor; 4768. Extension plate; 48. Upper plate; 5. Transport device; 51. Short plate; 52. Mounting column; 53. Fifth rotating shaft; 54. Fourth gear; 55. Long plate; 56. Ventilation device; 561. First connecting rod; 562. Second connecting rod; 563. Push rod; 564. Ventilation box; 565. First air outlet pipe; 566. Second air outlet pipe; 6. Detection box. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example: Figures 1-10 As shown, the present invention provides a technical solution: a VOC environmental detection device includes a base 1, a power unit 2 installed on the base 1, a sampling device 4 installed on one side of the power unit 2, a switching device 3 installed on the sampling device 4, a transport device 5 installed on one side of the sampling device 4, a detection box 6 installed on the transport device 5, and the power unit 2 is connected to a control system.

[0031] The switching device 3 includes a worm gear mounted on the power unit 2. A protective shell is mounted on the sampling device 4. A first chassis and a second chassis are installed inside the protective shell. A first clutch device 32 is rotatably mounted on the first chassis. A first gear 33 is mounted on the first clutch device 32. A first worm wheel 31 is rotatably mounted on the first clutch device 32. A first limit block is installed inside the first worm wheel 31. The worm gear and the first worm wheel 31 mesh. A second clutch device 35 is rotatably mounted on the second chassis. A second gear 36 is mounted on the second clutch device 35. A second worm wheel 34 is rotatably mounted on the second clutch device 35. A second limit block is installed inside the second worm wheel 34. The worm gear and the second worm wheel 34 mesh. A cylinder 37 is mounted on the top of the protective shell. A mounting plate is mounted on the cylinder rod of the cylinder 37. A first pin 38 is mounted on one side of the mounting plate. A second pin 39 is mounted on the other side of the mounting plate. The cylinder 37 is connected to the control system. The power unit 2 is an electric motor. The motor starts, and its output shaft drives the worm gear to rotate. The worm gear drives the first worm wheel 31 and the second worm wheel 34 to rotate. When a higher elevation is needed, the cylinder rod of cylinder 37 extends, pushing the mounting plate towards the first worm wheel 31. The mounting plate then drives the first pin 38 and the second pin 39 towards the first worm wheel 31. The first limiting block drives the first rotating disk 322 to rotate, which in turn drives the first rotating shaft 321 to rotate. The first rotating shaft 321 drives the first gear 33 to rotate, and the first gear 33 drives the third gear 43 to rotate. When sampling is needed, the cylinder rod of cylinder 37 retracts, pushing the mounting plate away from the first worm wheel 31. The mounting plate then drives the first pin 38 and the second pin 39 away from the first worm wheel 31. The second limiting block drives the second rotating disk 352 to rotate, which in turn drives the second rotating shaft 351 to rotate. The second rotating shaft 351 drives the second gear 36 to rotate, and the second gear 36 drives the fourth gear 54 to rotate.

[0032] The first clutch device 32 includes a first rotating shaft 321, which rotates on a first chassis. A first gear 33 rotates on the first rotating shaft 321. A first rotating disk 322 is mounted on one side of the first rotating shaft 321. A first sliding groove 325 is provided inside the first rotating disk 322. A first groove is provided on one side of the first sliding groove 325. A first pin 38 slides in the first sliding groove 325. A first wedge block 323 is slidably installed in the first groove. A first protruding rod 324 is mounted on one side of the first wedge block 323. A first spring is sleeved on the outside of the first protruding rod 324. One side of the first spring is mounted on the first wedge block 323, and the other side of the first spring is mounted on the inner wall of the first groove. When the first pin 38 moves toward the first worm gear 31, the first pin 38 slides in the first sliding groove 325, the first pin 38 drives the first wedge block 323 to move in the first groove, the first wedge block 323 moves away from the first pin 38, the first wedge block 323 drives the first protrusion 324 to move away from the first pin 38, and the first limiting block engages with the first protrusion 324.

[0033] The second clutch device 35 includes a second rotating shaft 351, which rotates on a first chassis. A second gear 36 rotates on the second rotating shaft 351. A second rotating disk 352 is mounted on one side of the second rotating shaft 351. A second sliding groove 355 is provided inside the second rotating disk 352. A second groove is provided on one side of the second sliding groove 355. A third sliding groove 356 is provided on one side of the second groove. A second pin 39 slides within the second sliding groove 355 and the third sliding groove 356. A second wedge block 353 is slidably mounted within the second groove. A second protruding rod 354 is mounted on one side of the second wedge block 353. A second spring is sleeved on the outer side of the second protruding rod 354. One side of the second spring is mounted on the second wedge block 353, and the other side of the second spring is mounted on the inner wall of the second groove. When the second pin 39 moves away from the first worm gear 31, the second pin 39 slides in the second sliding groove 355. The second pin 39 drives the second wedge block 353 to move in the second groove. The second wedge block 353 moves away from the second pin 39. The second wedge block 353 drives the second protrusion 354 to move away from the second pin 39. The second limiting block engages with the second protrusion 354.

[0034] The sampling device 4 includes a lower plate 41, which is mounted on a base 1. A protective shell is mounted on the lower plate 41. A first fixed cylinder 42 and a second fixed cylinder are mounted on the lower plate 41. A third rotating shaft is rotatably mounted inside the first fixed cylinder 42. A third gear 43 is mounted on the third rotating shaft and meshes with the first gear 33. A lead screw 44 is connected to one side of the third rotating shaft. A guide rod 45 is mounted on one side of the second fixed cylinder. An upper plate 48 is mounted on one side of the guide rod 45. A trigger block 46 is mounted on the outside of the guide rod 45. A sampling platform 47 is slidably mounted on the lead screw 44 and slides on the guide rod 45. The third gear 43 drives the third rotating shaft to rotate, which in turn drives the lead screw 44 to rotate. The lead screw 44 then moves the sampling platform 47 towards the upper plate 48.

[0035] The sampling platform 47 includes a sliding plate 471, which slides on a lead screw 44 and a guide rod 45. A triggering device 472 is installed on one side of the sliding plate 471, and a lever 474 is rotatably installed on one side of the triggering device 472. A support rod 475 is installed on the sliding plate 471, and the lever 474 rotates around the support rod 475. An air extraction device 476 is rotatably installed on the other side of the lever 474, and a sealing shell 473 is installed on the outside of the lever 474. The sealing shell 473 is installed on the sliding plate 471.

[0036] The triggering device 472 includes a housing 4721, which is mounted on a sliding plate 471. A guide groove 4722 is provided on the housing 4721. A trigger groove 4723 is provided on one side of the guide groove 4722. A trigger plate 4724 is slidably installed in the trigger groove 4723. A guide post is installed on one side of the trigger plate 4724. A third spring 4725 is sleeved on the outside of the guide post. One side of the third spring 4725 is installed on the trigger plate 4724, and the other side of the third spring 4725 is installed on the inner wall of the trigger groove 4723. A connecting block 4726 is connected to the outside of the trigger plate 4724. A lever 474 rotates on the connecting block 4726. A rotating groove is provided on the trigger plate 4724. A fourth rotating shaft is rotatably installed in the rotating groove. A rotating plate 4727 is installed on the fourth rotating shaft. A torsion spring is installed on the fourth rotating shaft. When an upward movement is required, the trigger block 46 on the guide rod 45 slides within the guide groove 4722 until it abuts against the rotating plate 4727. The trigger block 46 then causes the rotating plate 4727 to slide closer to the sliding plate 471. The rotating plate 4727 then causes the trigger plate 4724 to slide within the trigger groove 4723. The trigger plate 4724 slides closer to the sliding plate 471, which in turn causes the connecting block 4726 to slide closer to the sliding plate 471. The connecting block 4726 then causes the lever 474 to rotate around the support rod 475. 4. The pressure of the amplified connecting block 4726 is amplified, and the lever 474 drives the extension plate 4768 to slide away from the sliding plate 471, controlling the motor to stop. When it is necessary to continue to rise, the control motor continues to start. At this time, the trigger block 46 drives the rotating plate 4727 to overcome the elastic force of the torsion spring. The rotating plate 4727 rotates, and the trigger block 46 leaves the rotating plate 4727. At this time, the rotating plate 4727 resets under the elastic force of the torsion spring, and the trigger plate 4724 resets under the elastic force of the third spring 4725. The trigger block 46 slides out from the outer shell 4721 and leaves the sliding plate 471.

[0037] The air extraction device 476 includes an air extraction box 4761, which is mounted on a sliding plate 471. A first air inlet pipe is installed on one side of the air extraction box 4761. A connecting pipe 4762 is installed above the air extraction box 4761. A top plate is installed on one side of the connecting pipe 4762. A support plate 4763 is slidably installed on the outside of the connecting pipe 4762. An extension plate 4768 is installed on one side of the support plate 4763. One side of a lever 474 rotates on the extension plate 4768. A connecting column 4764 is installed on the other side of the support plate 4763. A sealing cover 4765 is installed on one side of the connecting column 4764. A sealing block 4766 is installed on one side of the sealing cover 4765. The sealing block 4766 slides inside the connecting pipe 4762. A pressure sensor 4767 is installed on one side of the top plate and is connected to the control system. The extension plate 4768 drives the support plate 4763 to slide on the connecting pipe 4762. The support plate 4763 slides away from the sliding plate 471. The support plate 4763 drives the connecting column 4764 to move away from the sliding plate 471. The connecting column 4764 drives the sealing cover 4765 to move away from the sliding plate 471. At this time, the sealing block 4766 leaves the connecting pipe 4762. The support plate 4763 presses on the pressure sensor 4767 on one side of the top plate. After the pressure sensor 4767 senses the pressure, it controls the cylinder 37 to retract.

[0038] The transport device 5 includes a short plate 51, which is mounted on a base 1. A mounting column 52 is mounted on the short plate 51. A detection box 6 is mounted on the mounting column 52. A long plate 55 is mounted on one side of the mounting column 52. A fifth rotating shaft 53 is rotatably mounted between the short plate 51 and the long plate 55. A fourth gear 54 is mounted on the fifth rotating shaft 53. The fourth gear 54 meshes with the second gear 36. A ventilation device 56 is mounted on one side of the long plate 55.

[0039] The ventilation device 56 includes a first connecting rod 561, which is mounted on a fifth rotating shaft 53. A second connecting rod 562 is rotatably mounted on one side of the first connecting rod 561, and a push rod 563 is rotatably mounted on one side of the second connecting rod 562. A push plate is mounted on one side of the push rod 563. A ventilation box 564 is mounted on a long plate 55. The push plate slides inside the ventilation box 564. A first exhaust pipe 565 and a second exhaust pipe 566 are mounted on one side of the ventilation box 564. An exhaust pipe is mounted at one end of the ventilation box 564. The first exhaust pipe 565 and the first intake pipe are connected by a pipe. The second exhaust pipe 566 and the detection box 6 are connected by a pipe. A first electric valve is installed in the first exhaust pipe 565. A second electric valve is installed in the second exhaust pipe 566. A third electric valve is installed in the exhaust pipe. The first electric valve, the second electric valve, and the third electric valve are connected to the control system. The fourth gear 54 drives the fifth rotating shaft 53 to rotate, the fifth rotating shaft 53 drives the first connecting rod 561 to rotate, and the first connecting rod 561 drives the second connecting rod 562 to rotate. When the second connecting rod 562 drives the push rod 563 to move closer to the fifth rotating shaft 53, the push rod 563 drives the push plate to slide in the air exchange box 564. The push plate moves closer to the fifth rotating shaft 53, at which time the first electric valve is activated, and the second and third electric valves are closed. At this time, the connecting pipe 4762 draws sampling gas from the outside, and the sampling gas enters the air exchange box 564 through the first outlet pipe 565. When the second connecting rod 562 drives the push rod 563 to move away from the fifth rotating shaft 53, the push rod 563 drives the push plate to slide in the air exchange box 564. The push plate moves away from the fifth rotating shaft 53, at which time the second electric valve is activated, and the first electric valve... When the first and third electric valves are closed, the sampled gas in the ventilation box 564 is pushed into the detection box 6 through the second outlet pipe 566. The control motor stops, and the detection box 6 detects the concentration of the sampled gas. After the detection is completed, the control motor starts again, and the second connecting rod 562 drives the push rod 563 to move closer to the fifth rotating shaft 53. At this time, the control second electric valve starts, and the first and third electric valves close, drawing the sampled gas in the detection box 6 into the ventilation box 564 through the second outlet pipe 566. The second connecting rod 562 drives the push rod 563 to move away from the fifth rotating shaft 53. At this time, the control third electric valve starts, and the first and second electric valves close. The sampled gas in the ventilation box 564 is discharged from the exhaust pipe, clearing the residual gas sample and avoiding interference from the previous sampling results.

[0040] Working principle of the invention:

[0041] When an increase in height is required, the control motor starts, and the motor's output shaft drives the worm gear to rotate. The worm gear drives the first worm wheel 31 and the second worm wheel 34 to rotate. The cylinder rod of the control cylinder 37 extends, and the cylinder rod pushes the mounting plate to move closer to the first worm wheel 31. The mounting plate drives the first pin 38 and the second pin 39 to move closer to the first worm wheel 31. When the first pin 38 moves closer to the first worm wheel 31, the first pin 38 slides in the first sliding groove 325. The first pin 38 drives the first wedge block 323 to move in the first groove, and the first wedge block 323 moves away from the first pin 38. The first wedge block 323 drives the first protruding rod 324 to move away from the first pin 38. The first limiting block engages with the first protruding rod 324. The first limiting block drives the first rotating disk 322 to rotate. At this time, the second limiting block disengages from the second rotating disk 352. The first rotating disk 322 drives the first rotating shaft 321 to rotate. The first rotating shaft 321 drives the first gear 33 to rotate. The first gear 33 drives the third gear 43 to rotate. The third gear 43 drives the third rotating shaft to rotate. The third rotating shaft drives the lead screw 44 to rotate. The lead screw 44 drives the sampling platform 47 to move towards the upper plate 48 on the lead screw 44.

[0042] When the sampling platform 47 rises, the trigger block 46 on the guide rod 45 slides within the guide groove 4722 until it abuts against the rotating plate 4727. The trigger block 46 then drives the rotating plate 4727 to slide closer to the sliding plate 471. The rotating plate 4727 then drives the trigger plate 4724 to slide within the trigger groove 4723. The trigger plate 4724 slides closer to the sliding plate 471, which in turn drives the connecting block 4726 to slide closer to the sliding plate 471. The connecting block 4726 then drives the lever 474 to rotate around the support rod 475. The lever 474 amplifies the pressure of the connecting block 4726. The extension plate 4768 is moved away from the sliding plate 471. The extension plate 4768 causes the support plate 4763 to slide on the connecting pipe 4762. The support plate 4763 moves away from the sliding plate 471. The support plate 4763 causes the connecting column 4764 to move away from the sliding plate 471. The connecting column 4764 causes the sealing cover 4765 to move away from the sliding plate 471. At this time, the sealing block 4766 leaves the connecting pipe 4762. The support plate 4763 presses on the pressure sensor 4767 on one side of the top plate. After the pressure sensor 4767 senses the pressure, the control cylinder 37 retracts and the control motor stops.

[0043] When the lever of cylinder 37 retracts, the cylinder rod pushes the mounting plate to move away from the first worm gear 31. The mounting plate drives the first pin 38 and the second pin 39 to move away from the first worm gear 31. The second pin 39 slides in the second sliding groove 355. The second pin 39 drives the second wedge block 353 to move in the second groove. The second wedge block 353 moves away from the second pin 39. The second wedge block 353 drives the second protruding rod 354 to move away from the second pin 39. The second limiting block engages with the second protruding rod 354. The second limiting block drives the second rotating disk 352 to rotate. At this time, the first limiting block disengages from the first rotating disk 352. The second rotating disk 352 drives the second rotating shaft 351 to rotate. The second rotating shaft 351 drives the second gear 36 to rotate. The second gear 36 drives the fourth gear 54 to rotate. The fourth gear 54 drives the fifth rotating shaft 53 to rotate. The fifth rotating shaft 53 drives the first connecting rod 56. 1. Rotation: The first connecting rod 561 drives the second connecting rod 562 to rotate. When the second connecting rod 562 drives the push rod 563 to move closer to the fifth rotating shaft 53, the push rod 563 drives the push plate to slide within the air exchange box 564. The push plate moves closer to the fifth rotating shaft 53. At this time, the first electric valve is activated, and the second and third electric valves are closed. At this time, the connecting pipe 4762 draws sampling gas from the outside. The sampling gas enters the air exchange box 564 through the first outlet pipe 565. When the second connecting rod 562 drives the push rod 563 to move away from the fifth rotating shaft 53, the push rod 563 drives the push plate to slide within the air exchange box 564. The push plate moves away from the fifth rotating shaft 53. At this time, the second electric valve is activated, and the first and third electric valves are closed. The sampling gas in the air exchange box 564 is pushed into the detection box 6 through the second outlet pipe 566. The motor is stopped, and the detection box 6 detects the concentration of the sampling gas.

[0044] After the test is completed, the control motor continues to start, and the second connecting rod 562 drives the push rod 563 to move closer to the fifth rotating shaft 53. At this time, the control second electric valve is activated, and the first electric valve and the third electric valve are closed, drawing the sampled gas in the test chamber 6 into the ventilation chamber 564 through the second exhaust pipe 566. The second connecting rod 562 drives the push rod 563 to move away from the fifth rotating shaft 53. At this time, the control third electric valve is activated, and the first electric valve and the second electric valve are closed, and the sampled gas in the ventilation chamber 564 is discharged from the exhaust pipe, clearing the residual gas sample and avoiding interference from the previous sampling results.

[0045] When further sampling is required, the cylinder rod of the control cylinder 37 extends, and the control motor continues to start. At this time, the trigger block 46 drives the rotating plate 4727 to overcome the spring force of the torsion spring. The rotating plate 4727 rotates, and the trigger block 46 leaves the rotating plate 4727. At this time, the rotating plate 4727 resets under the spring force of the torsion spring, and the trigger plate 4724 resets under the spring force of the third spring 4725. The trigger block 46 slides out from the outer shell 4721 and leaves the sliding plate 471. The sampling platform 47 continues to rise to the required height.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. In all respects, the embodiments should be considered illustrative and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description; therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A VOC environmental detection device with multi-layer sampling function, characterized in that: The VOC environmental detection device includes a base (1), a power unit (2) is installed on the base (1), a sampling device (4) is installed on one side of the power unit (2), a switching device (3) is installed on the sampling device (4), a transport device (5) is installed on one side of the sampling device (4), a detection box (6) is installed on the transport device (5), and the power unit (2) is connected to the control system. The switching device (3) includes a worm gear, which is mounted on the power device (2). A protective shell is installed on the sampling device (4). A first chassis and a second chassis are installed inside the protective shell. A first clutch device (32) is rotatably mounted on the first chassis. A first gear (33) is mounted on the first clutch device (32). A first worm wheel (31) is rotatably mounted on the first clutch device (32). A first limiting block is installed inside the first worm wheel (31). The worm gear and the first worm wheel (31) mesh. A first limit block is rotatably mounted on the second chassis. A dual-clutch device (35) is provided, on which a second gear (36) is mounted. A second worm gear (34) is rotatably mounted on the second clutch device (35). A second limiting block is installed inside the second worm gear (34). The worm and the second worm gear (34) mesh. A cylinder (37) is mounted above the protective shell. A mounting plate is mounted on the cylinder rod of the cylinder (37). A first pin (38) is mounted on one side of the mounting plate. A second pin (39) is mounted on the other side of the mounting plate. The cylinder (37) is connected to the control system.

2. The VOC environmental detection device with multi-layer sampling function according to claim 1, characterized in that: The first clutch device (32) includes a first rotating shaft (321), which rotates on a first chassis. The first gear (33) rotates on the first rotating shaft (321). A first rotating disk (322) is installed on one side of the first rotating shaft (321). A first sliding groove (325) is provided inside the first rotating disk (322). A first groove is provided on one side of the first sliding groove (325). The first pin (38) slides in the first sliding groove (325). A first wedge block (323) is slidably installed in the first groove. A first protruding rod (324) is installed on one side of the first wedge block (323). A first spring is sleeved on the outside of the first protruding rod (324). One side of the first spring is installed on the first wedge block (323), and the other side of the first spring is installed on the inner wall of the first groove.

3. A VOC environmental detection device with multi-layer sampling function according to claim 2, characterized in that: The second clutch device (35) includes a second rotating shaft (351), which rotates on the first chassis. The second gear (36) rotates on the second rotating shaft (351). A second rotating disk (352) is installed on one side of the second rotating shaft (351). A second sliding groove (355) is provided inside the second rotating disk (352). A second groove is provided on one side of the second sliding groove (355). A third sliding groove (356) is provided on one side of the second groove. The second pin (39) slides in the second sliding groove (355) and the third sliding groove (356). A second wedge block (353) is slidably installed in the second groove. A second protruding rod (354) is installed on one side of the second wedge block (353). A second spring is sleeved on the outside of the second protruding rod (354). One side of the second spring is installed on the second wedge block (353), and the other side of the second spring is installed on the inner wall of the second groove.

4. A VOC environmental detection device with multi-layer sampling function according to claim 3, characterized in that: The sampling device (4) includes a lower plate (41), which is mounted on a base (1). The protective shell is mounted on the lower plate (41). A first fixed cylinder (42) and a second fixed cylinder are mounted on the lower plate (41). A third rotating shaft is rotatably mounted inside the first fixed cylinder (42). A third gear (43) is mounted on the third rotating shaft. The third gear (43) meshes with the first gear (33). A lead screw (44) is connected to one side of the third rotating shaft. A guide rod (45) is mounted on one side of the second fixed cylinder. An upper plate (48) is mounted on one side of the guide rod (45). A trigger block (46) is mounted on the outside of the guide rod (45). A sampling platform (47) is slidably mounted on the lead screw (44). The sampling platform (47) slides on the guide rod (45).

5. A VOC environmental detection device with multi-layer sampling function according to claim 4, characterized in that: The sampling platform (47) includes a sliding plate (471) that slides on a lead screw (44) and a guide rod (45). A triggering device (472) is installed on one side of the sliding plate (471), and a lever (474) is rotatably installed on one side of the triggering device (472). A support rod (475) is installed on the sliding plate (471), and the lever (474) rotates around the support rod (475). An air extraction device (476) is rotatably installed on the other side of the lever (474), and a sealing shell (473) is installed on the outside of the lever (474). The sealing shell (473) is installed on the sliding plate (471).

6. A VOC environmental detection device with multi-layer sampling function according to claim 5, characterized in that: The triggering device (472) includes a housing (4721), which is mounted on a sliding plate (471). A guide groove (4722) is provided on the housing (4721). A trigger groove (4723) is provided on one side of the guide groove (4722). A trigger plate (4724) is slidably mounted in the trigger groove (4723). A guide post is mounted on one side of the trigger plate (4724). A third spring (4725) is sleeved on the outer side of the guide post. One side of the third spring (4725) is mounted on the trigger plate (4724), and the other side of the third spring (4725) is mounted on the inner wall of the trigger groove (4723). A connecting block (4726) is connected to the outer side of the trigger plate (4724). The lever (474) rotates on the connecting block (4726). A rotating groove is provided on the trigger plate (4724). A fourth rotating shaft is rotatably installed in the rotating groove. A rotating plate (4727) is mounted on the fourth rotating shaft. A torsion spring is mounted on the fourth rotating shaft.

7. A VOC environmental detection device with multi-layer sampling function according to claim 6, characterized in that: The air extraction device (476) includes an air extraction box (4761), which is mounted on a sliding plate (471). A first air inlet pipe is installed on one side of the air extraction box (4761). A connecting pipe (4762) is installed above the air extraction box (4761). A top plate is installed on one side of the connecting pipe (4762). A support plate (4763) is slidably installed on the outer side of the connecting pipe (4762). An extension plate (4768) is installed on one side of the support plate (4763). One side of the lever (474) rotates on the extension plate (4768), and a connecting column (4764) is installed on the other side of the support plate (4763). A sealing cover (4765) is installed on one side of the connecting column (4764), and a sealing block (4766) is installed on one side of the sealing cover (4765). The sealing block (4766) slides in the connecting pipe (4762). A pressure sensor (4767) is installed on one side of the top plate and is connected to the control system.

8. A VOC environmental detection device with multi-layer sampling function according to claim 7, characterized in that: The transport device (5) includes a short plate (51) mounted on a base (1), a mounting column (52) mounted on the short plate (51), a detection box (6) mounted on the mounting column (52), a long plate (55) mounted on one side of the mounting column (52), a fifth rotating shaft (53) rotatably mounted between the short plate (51) and the long plate (55), a fourth gear (54) mounted on the fifth rotating shaft (53), the fourth gear (54) meshing with the second gear (36), and a ventilation device (56) mounted on one side of the long plate (55).

9. A VOC environmental detection device with multi-layer sampling function according to claim 8, characterized in that: The ventilation device (56) includes a first connecting rod (561) mounted on a fifth rotating shaft (53). A second connecting rod (562) is rotatably mounted on one side of the first connecting rod (561). A push rod (563) is rotatably mounted on one side of the second connecting rod (562). A push plate is mounted on one side of the push rod (563). A ventilation box (564) is mounted on the long plate (55). The push plate slides inside the ventilation box (564). A second connecting rod (562) is mounted on one side of the ventilation box (564). The system includes an exhaust pipe (565) and a second exhaust pipe (566). One end of the air exchange box (564) is equipped with an exhaust pipe. The first exhaust pipe (565) and the first air inlet pipe are connected by a pipe. The second exhaust pipe (566) and the detection box (6) are connected by a pipe. A first electric valve is installed in the first exhaust pipe (565). A second electric valve is installed in the second exhaust pipe (566). A third electric valve is installed in the exhaust pipe. The first electric valve, the second electric valve and the third electric valve are connected to the control system.

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