An automatic detection device for volatile substances of farmland mulching film

Abstract

The application relates to the technical field of mulch volatile substance detection, and discloses an automatic farmland mulch volatile substance detection device, which comprises a gas guide cylinder, one end of which is provided with a sealing cover, and the other end of which is connected with a cover shell; a bottom plate is installed at the opening of the cover shell, is used for containing detection objects, and seals the cover shell; a heating assembly one is installed in the cover shell and is used for heating the detection objects through the cover shell; a heating assembly two is installed in the bottom plate and is used for heating the detection objects through the bottom plate, so as to accelerate the volatilization speed of the volatile substances in the detection objects; and a detector is used for detecting the volatile substances. The gas guide cylinder and the cover shell are communicated, the gas guide cylinder and the cover shell are respectively sealed through the sealing cover and the bottom plate, and a closed detection environment is formed, so that the influence of external environmental factors on the detection process in the detection process can be avoided, and the problem that the accuracy of the final detection result is affected is solved.

Description

Technical Field

[0001] This invention relates to the field of volatile organic compound (VOC) detection technology for agricultural mulch film, specifically an automated detection device for VOCs from agricultural mulch film. Background Technology

[0002] Mulching technology, as a key measure in modern agricultural production, has been widely applied. By laying a plastic film on the surface of farmland, soil temperature can be significantly increased, soil moisture maintained, weed growth effectively suppressed, and the occurrence of pests and diseases reduced, thereby creating a stable and superior growing environment for crops and ultimately achieving the goal of increasing crop yield and improving product quality. Therefore, mulching is of indispensable importance for ensuring food security and promoting agricultural income.

[0003] However, as a plastic product, agricultural mulch film typically contains various chemical additives such as plasticizers, stabilizers, and antioxidants during its production. In actual field use, the mulch film is exposed to sunlight (ultraviolet radiation) and high temperatures for extended periods, gradually aging and degrading. This causes these chemical additives and their degradation products to be released as volatile organic compounds (VOCs). These VOCs can not only migrate into the soil and air, causing environmental pollution, but can also be absorbed by crops, thus affecting the quality and safety of agricultural products and posing a potential threat to the ecological environment and human health. Therefore, accurate and reliable testing of VOCs from agricultural mulch film is crucial for environmental risk assessment and agricultural product safety supervision.

[0004] Currently, there are significant shortcomings in the detection methods for volatile organic compounds (VOCs) emitted from plastic film mulch. Existing methods mostly rely on in-situ, open-field sampling and analysis, or direct measurement using portable equipment. This approach is highly susceptible to interference from external environmental factors: constantly changing conditions such as wind speed, temperature, and humidity in the field directly affect the diffusion and concentration of VOCs, leading to large fluctuations in measurement data that are difficult to reproduce. Furthermore, moisture contained in the soil and plastic film itself evaporates upon heating, forming water vapor that mixes with the target VOCs, interfering with many detectors; simultaneously, the mixing of VOCs with a large amount of ambient air during sampling also reduces detection sensitivity. Most importantly, the release of VOCs is inherently non-uniform in time and space, and existing methods lack a process for homogenizing the collected gases, resulting in unrepresentative samples. In summary, existing detection technologies suffer from significant limitations in accuracy and reliability due to their susceptibility to environmental interference, inability to eliminate the influence of water vapor and air, and inability to guarantee sample homogeneity. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automated detection device for volatile organic compounds from agricultural mulch film. This device solves the problems of existing detection technologies being susceptible to environmental interference, unable to eliminate the influence of water vapor and air, and unable to guarantee sample uniformity, thus reducing the accuracy and reliability of detection results.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automated detection device for volatile organic compounds from agricultural mulch film, comprising:

[0007] The air delivery tube has a sealing cap at one end and a cover at the other end;

[0008] The base plate, which is installed at the opening of the casing, is used to hold the test object and seal the casing;

[0009] Heating component one is installed inside the housing to generate heat and heat the sample through the housing, thereby accelerating the evaporation rate of volatiles in the sample;

[0010] Heating component two is installed inside the base plate to generate heat and heat the sample through the base plate, thereby accelerating the volatilization rate of volatiles in the sample;

[0011] The detector, installed inside the gas delivery tube, is used to detect volatiles.

[0012] Preferably, a UV lamp is fixedly connected to the inner wall of the cover for irradiating the object to be detected, and an installation tube is connected to the upper middle part of the air guide tube, and the detector is installed inside the installation tube.

[0013] Preferably, a limiting ring is fixedly connected to the middle of the top surface of the base plate, a contact end is connected to one side of the second heating component, and a contact point is provided at the bottom inner side of the cover, with the contact point in contact with the contact end.

[0014] Preferably, a sealing strip is fixedly connected to the bottom of the inner wall of the cover, and a sealing strip is fixedly connected to the middle edge of the top surface of the bottom plate. A recessed portion is provided on one side of the sealing strip, and a protruding portion is provided on one side of the sealing strip, and the protruding portion and the recessed portion are in contact.

[0015] Preferably, a vacuum assembly is provided at the bottom of one side of the air guide cylinder. The vacuum assembly includes an exhaust pipe and a partition. The exhaust pipe is connected to the bottom of one side of the air guide cylinder. A solenoid valve and a vacuum pump are installed in the middle of the exhaust pipe. The partition is fixedly connected to the middle of the air guide cylinder. An air outlet pipe is fixedly connected to the middle of the partition. A solenoid valve is provided in the air outlet pipe.

[0016] Preferably, an air disturbance component is provided in the middle of the air guide cylinder, and the air disturbance component is located above the vacuum component. The air disturbance component includes a circular plate one, the middle of which is fixedly connected to the top of the outer wall of the air outlet pipe. A vertical plate is fixedly connected to the middle of the top surface of the circular plate one, and a circular plate two is fixedly connected to the top of the vertical plate. Guide plates are fixedly connected to both sides of the top surface of the circular plate two. An air guide channel is provided in the middle of the circular plate two and the guide plate. A circular plate three is provided at the top of the guide plate, and the top of the circular plate three is connected to the air outlet cylinder. A flow guide plate is fixedly connected inside the air outlet cylinder.

[0017] Preferably, the opening direction of the air guide channel in the middle of the guide plates on both sides is towards the middle of the second circular plate, the vertical plate is located in the middle of the air outlet opening, and the first circular plate, the second circular plate and the third circular plate are all fixedly connected to the inner wall of the air guide cylinder.

[0018] Preferably, a cooling collection assembly is also provided at the top of the air guide cylinder. The cooling collection assembly includes a water tank, a guide block, and a collection bottle. The water tank is fixedly connected to the top of the air guide cylinder. A delivery pump is fixedly connected to one side of the top of the water tank. A delivery pipe is fixedly connected to the input end of the delivery pump. The bottom of the delivery pipe is located at the inner bottom of the water tank. A water inlet is provided on the other side of the top of the water tank. The guide block is fixedly connected to the bottom of the inner wall of the top of the air guide cylinder and is located directly below the water tank. The collection bottle is connected to the guide block and is threadedly connected to the air guide cylinder.

[0019] Preferably, the top of the guide block is provided with an inclined surface, the middle of the guide block is provided with a through hole, and the collection bottle is connected to the through hole.

[0020] Preferably, a protrusion is fixedly connected to the bottom surface of the water tank, the cross-section of the protrusion is an inverted cone shape, and the protrusion is located directly above the guide block.

[0021] This invention provides an automated detection device for volatile organic compounds emitted from agricultural mulch film. It has the following beneficial effects:

[0022] 1. This invention connects the air guide tube and the cover, and seals the air guide tube and the cover with a sealing cover and a bottom plate respectively, thereby forming a closed detection environment. Therefore, it can avoid the problem that external environmental factors will affect the detection process and thus affect the accuracy of the final detection results.

[0023] 2. The present invention can heat the test substance by using heating component one and heating component two. At this time, the water contained in the test substance can be evaporated. Then, the test substance is heated again to accelerate the volatilization of its volatile substances. At the same time, the UV lamp is turned on, so as to avoid the water vapor and volatile substances from mixing together, which would lead to inaccurate test results.

[0024] 3. By utilizing a vacuum component, the present invention can first extract the air inside the air delivery cylinder before heating the test object, thereby avoiding the mixing of residual air and volatiles in the air delivery cylinder, thus further improving the accuracy of the test results.

[0025] 4. This invention installs an air disturbance component inside the air guide cylinder, which uses a vertical plate to separate the gas discharged from the outlet pipe into two streams. The two streams of gas can be mixed together through the air guide channel before being discharged from the outlet cylinder. This improves the uniformity of volatile substances mixing in the gas, thereby ensuring the accuracy of the test results.

[0026] 5. This invention utilizes a detector to perform optical detection of volatiles. After adding water to the tank, the heated volatiles are cooled, resulting in condensation. The condensation is guided by a protrusion onto a guide block and then flows along the inclined surface and through the hole into a collection bottle, thus completing the collection of volatiles. Finally, by removing the collection bottle, chemical reagents can be added for chemical detection, thereby achieving the purpose of dual optical and chemical monitoring. The two detection results can corroborate each other, improving the reliability of the detection results. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a front cross-sectional view of the casing of the present invention;

[0029] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0030] Figure 4 This is an exploded view of the casing structure of the present invention;

[0031] Figure 5 This is an exploded view of the base plate structure of the present invention;

[0032] Figure 6 This is a front sectional view of the vacuum assembly of the present invention;

[0033] Figure 7 for Figure 6 Enlarged view of point B in the image;

[0034] Figure 8 This is a top view of the guide vane of the present invention;

[0035] Figure 9 This is a front sectional view of the cooling collection assembly of the present invention;

[0036] Figure 10 This is a schematic diagram of the detector part of the present invention.

[0037] The components include: 1. Air guide tube; 2. Sealing cover; 3. Housing; 301. Heating component one; 302. UV lamp; 303. Contact point; 304. Sealing strip one; 4. Base plate; 401. Limiting ring; 402. Heating component two; 403. Contact end; 404. Sealing strip two; 5. Detector; 501. Mounting tube; 6. Vacuum assembly; 601. Exhaust pipe; 602. Air pump; 603. Solenoid valve one; 604. Partition plate; 605. Air outlet pipe; 6 06. Solenoid Valve II; 7. Air Turbidation Assembly; 701. Circular Plate I; 702. Vertical Plate; 703. Circular Plate II; 704. Guide Plate; 705. Air Guide Channel; 706. Circular Plate III; 707. Air Outlet; 708. Flow Guide Plate; 8. Cooling Collection Assembly; 801. Water Tank; 802. Water Inlet; 803. Delivery Pump; 804. Delivery Pipe; 805. Protrusion; 806. Guide Block; 807. Collection Bottle; 808. Inclined Surface; 809. Through Hole. Detailed Implementation

[0038] The technical solutions in 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.

[0039] To better understand the present invention, the above content will be described in detail below with reference to specific embodiments.

[0040] Please see the appendix Figure 1 -Appendix Figure 10 This invention provides an automated detection device for volatile organic compounds from agricultural mulch film, comprising: an air guide cylinder 1, one end of which is provided with a sealing cap 2, and the other end is connected to a cover 3; a base plate 4, which is installed at the opening of the cover 3 for holding the test material and sealing the cover 3; a heating component 301, which is installed inside the cover 3 for generating heat and heating the test material through the cover 3, thereby accelerating the evaporation rate of volatile organic compounds in the test material; a second heating component 402, which is installed inside the base plate 4 for generating heat and heating the test material through the base plate 4, thereby accelerating the evaporation rate of volatile organic compounds in the test material; and a detector 5, which is installed inside the air guide cylinder 1 for detecting volatile organic compounds.

[0041] In this embodiment, the air guide tube 1 is connected to the housing 3, and the opening of the air guide tube 1 can be sealed by the sealing cap 2, and the opening of the housing 3 can be sealed by the base plate 4. Therefore, by placing the test object on the base plate 4 and then engaging the housing 3 with the base plate 4, a sealed space is formed between the housing 3, the base plate 4, the air guide tube 1 and the sealing cap 2, thus forming a closed test space. This can eliminate the influence of the external environment (such as wind and dust) on the test environment, thereby improving the accuracy of the test results. Furthermore, by setting a heating component 301 inside the housing 3 and a heating component 402 inside the base plate 4, bidirectional heating of the test object can be achieved, which can make the test object heat up faster and more evenly. This can not only evaporate and remove excess moisture in the sample, but also accelerate the volatilization rate of the target volatile substances.

[0042] Please see the appendix Figure 1 and Figure 2 A UV lamp 302 is fixedly connected to the inner wall of the housing 3 for irradiating the object to be tested. An installation tube 501 is connected to the upper middle part of the air guide tube 1, and the detector 5 is installed inside the installation tube 501. A limit ring 401 is fixedly connected to the middle of the top surface of the base plate 4. A contact end 403 is connected to one side of the heating component 402. A contact point 303 is provided at the bottom inner part of the housing 3, and the contact point 303 is in contact with the contact end 403.

[0043] In this embodiment, the UV lamp 302 can simulate the light environment, thereby reproducing the volatiles produced by the mulch film under sunlight in the field, which can further accelerate the evaporation rate of volatile substances in the sample. Furthermore, through the contact point 303, when the cover 3 and the bottom plate 4 are fastened together, a path is formed between them and the contact end 403 of the heating component 402. The detector 5 can then perform optical detection of the volatiles. Specifically, the detector 5 emits a specific wavelength light beam that passes through the gas. If the volatiles contain target volatile molecules that can absorb that wavelength of light, the intensity of the light beam will attenuate. At this time, the photoelectric sensor located at the end of the optical path is responsible for receiving the light signal after penetrating the gas and converting its intensity into an electrical signal. Finally, by comparing the initial light intensity of the light source with the attenuated light intensity received by the sensor through the built-in signal processor, the real-time concentration of the volatiles can be accurately calculated according to the Lambert-Beer law, thus completing the analysis of the volatiles. The detector 5 can be a photoionization detector, a non-dispersive infrared sensor, or a semiconductor gas sensor. The detector 5 is a standard optical detection module in the prior art, and its specific structure is common knowledge in the field and will not be described in detail here.

[0044] And in another embodiment:

[0045] To facilitate real-time on-site observation, the device is also equipped with a display screen (not shown in the figure) on the top of the gas delivery cylinder 1. The display screen is electrically connected to the signal processor of the detector 5. The real-time concentration data of volatiles calculated by the detector 5 will be directly displayed on the screen in the form of numbers or curves, so that the operator can intuitively grasp the dynamic changes of volatiles without the need for an external computer.

[0046] Depending on the type of detector 5 selected, this device can detect various common harmful volatile substances emitted by plastic film mulch. Specifically, detector 5 can be one or more of the following combinations:

[0047] Photoionization detector (PID): It has high sensitivity to most volatile organic compounds (VOCs), and is particularly suitable for detecting aromatic hydrocarbons such as benzene, toluene, ethylbenzene, and xylene (BTEXs) that may be produced by the degradation of mulch film, as well as volatile monomers of some plasticizers (such as phthalates).

[0048] Semiconductor gas sensors: capable of detecting a variety of reducing gases, including carbon monoxide (CO), hydrogen sulfide (H2S), and various volatile organic compounds (VOCs).

[0049] Therefore, users can select the most suitable detector module for this device based on the main types of pollutants of concern, achieving targeted and high-precision online monitoring of specific hazardous substances. Furthermore, detector 5 is a standard optical detection module in existing technology, and its specific structure is common knowledge in the field, and will not be described in detail here.

[0050] Please see the appendix Figure 2 and Figure 3 A sealing strip 304 is fixedly connected to the bottom of the inner wall of the cover 3, and a sealing strip 404 is fixedly connected to the middle edge of the top surface of the bottom plate 4. A recessed part is provided on one side of the sealing strip 404, and a protruding part is provided on one side of the sealing strip 304, and the protruding part and the recessed part are in contact.

[0051] In this embodiment, the sealing performance between the cover 3 and the base plate 4 can be improved by the sealing strip 304 and the sealing strip 404. Furthermore, the mutual locking of the protrusions and recesses can be achieved to prevent relative misalignment between the two, thereby ensuring the sealing performance of the device.

[0052] Please see the appendix Figure 1 and Figure 6A vacuum assembly 6 is provided at the bottom of one side of the air guide cylinder 1. The vacuum assembly 6 includes an exhaust pipe 601 and a partition 604. The exhaust pipe 601 is connected to the bottom of one side of the air guide cylinder 1. A solenoid valve 603 and a vacuum pump 602 are installed in the middle of the exhaust pipe 601. The partition 604 is fixedly connected to the middle of the air guide cylinder 1. An exhaust pipe 605 is fixedly connected to the middle of the partition 604. A solenoid valve 606 is provided in the exhaust pipe 605.

[0053] In this embodiment, after the water vapor in the test object is discharged during heating, the sealing cap 2 is tightened. At this time, the solenoid valve 603 and the solenoid valve 606 can be opened, and then the vacuum pump 602 can be driven to extract the gas inside the device, thereby forming a vacuum environment. At the same time, the residual water vapor can also be extracted, thus providing a pure detection environment for detection and eliminating the influence of external factors on the detection results.

[0054] Please see the appendix Figures 6-8 An air disturbance component 7 is provided in the middle of the air guide cylinder 1. The air disturbance component 7 is located above the vacuum component 6. The air disturbance component 7 includes a circular plate 701. The middle of the circular plate 701 is fixedly connected to the top of the outer wall of the air outlet pipe 605. A vertical plate 702 is fixedly connected to the middle of the top surface of the circular plate 701. A circular plate 703 is fixedly connected to the top of the vertical plate 702. Guide plates 704 are fixedly connected to both sides of the top surface of the circular plate 703. An air guide channel 705 is provided in the middle of the circular plate 703 and the guide plate 704. A circular plate 706 is provided at the top of the guide plate 704. The top of the circular plate 706 is connected to the air outlet cylinder 707. A flow guide plate 708 is fixedly connected inside the air outlet cylinder 707. The opening direction of the air guide channel 705 in the middle of the two guide plates 704 is towards the middle of the circular plate 703. The vertical plate 702 is located in the middle of the opening of the air outlet pipe 605. The circular plate 701, the circular plate 703 and the circular plate 706 are all fixedly connected to the inner wall of the air guide cylinder 1.

[0055] In this embodiment, the vertical plate 702 in the air disturbance component 7 can divide the volatile gas cloud into two airflows. At this time, the two airflows will be discharged along the two air guide channels 705 respectively. Through guidance, the uneven gas cloud that may have local concentration differences can be dispersed, and then mixed again between the second circular plate 703 and the third circular plate 706, thereby ensuring the uniformity of the distribution of volatile substances in the volatile gas cloud, and further ensuring the accuracy of detection.

[0056] Please see the appendix Figure 9 and Figure 10The top of the air delivery cylinder 1 is also equipped with a cooling collection assembly 8, which includes a water tank 801, a guide block 806, and a collection bottle 807. The water tank 801 is fixedly connected to the top of the air delivery cylinder 1. A delivery pump 803 is fixedly fixed to one side of the top of the water tank 801. A delivery pipe 804 is fixedly connected to the input end of the delivery pump 803. The bottom of the delivery pipe 804 is located at the bottom of the inner wall of the water tank 801. A water inlet 802 is provided on the other side of the top of the water tank 801. The guide block 806 is fixedly connected to the bottom of the inner wall of the top of the air delivery cylinder 1, and the guide block 806 is located directly below the water tank 801. The collection bottle 807 is connected to the guide block 806 and is threadedly connected to the air delivery cylinder 1. The top of the guide block 806 is provided with a slope 808, and the middle of the guide block 806 is provided with a through hole 809, which is connected to the collection bottle 807. A protrusion 805 is fixedly connected to the bottom surface of the water tank 801. The cross-section of the protrusion 805 is an inverted cone shape, and the protrusion 805 is located directly above the guide block 806.

[0057] In this embodiment, cooling water is injected into the water tank 801 through the water inlet 802 at the top. The surface of the inverted conical protrusion 805 can provide a condensation point for the volatiles. When the hot gas flow of the volatiles after optical detection comes into contact with it, a condensation phase change will occur, forming droplets. These droplets will then fall onto the guide block 806 directly below the protrusion 805. The guide block 806 has a slope 808, which further guides the droplets to slide into the through hole 809 and finally into the collection bottle 807. At this time, the collection bottle 807 can be unscrewed, and chemical reagents can be added to it for chemical detection.

[0058] The specific chemical detection steps can be selected according to the different target pollutants, for example:

[0059] Rapid on-site qualitative / semi-quantitative detection:

[0060] Target substance: Phthalate plasticizers (such as DEHP, DBP, etc.).

[0061] Detection method: Commercially available rapid test kits can be used. Add the condensate from the collection bottle to the test strip or reagent tube. The colorimetric reagent in the test strip will react specifically with the target substance. For example, if the sample contains phthalates, the solution may turn a distinct purple or blue within minutes. By observing the intensity of the color and comparing it with a standard colorimetric card, the presence of harmful substances and their approximate concentration range can be quickly determined.

[0062] Precise laboratory testing:

[0063] Target substances: polycyclic aromatic hydrocarbons (PAHs) or specific volatile organic compounds (VOCs).

[0064] Detection method: The condensate in the collection bottle is used as the test sample and analyzed using professional analytical instruments. For example, high-performance liquid chromatography (HPLC) or gas chromatography-mass spectrometry (GC-MS) can be used for analysis. With these sophisticated instruments, not only can the specific harmful chemical components contained in the volatiles be accurately identified, but the content of each component can also be precisely determined, obtaining accurate data at the ppb (parts per billion) level.

[0065] Working principle: When using, first separate the cover 3 and the base plate 4, then place the base plate 4, then place the object to be tested (soil or mulch film) in the limiting ring 401 on the base plate 4, and then snap the cover 3 into the top of the base plate 4.

[0066] Furthermore, when the sealing strip 304 and the sealing strip 404 are engaged, the protrusion on one side of the sealing strip 304 will engage into the recess on one side of the sealing strip 404, thereby ensuring the sealing between the cover 3 and the base plate 4.

[0067] Then, the sealing cover 2 is opened, and the heating component 301 and the heating component 402 are driven to run. At this time, the heat generated by the heating component 301 is first transferred to the cover 3, and then to the object to be tested on the base plate 4, thereby heating the object to be tested. The heating component 402 can heat the object to be tested through the base plate 4. Therefore, through the cooperation of the heating component 301 and the heating component 402, the moisture in the object to be tested can be heated and discharged along the air guide tube 1.

[0068] After the moisture is drained, first tighten the sealing cap 2 on the top of the air guide cylinder 1, then open both solenoid valve 603 and solenoid valve 606, and then drive the suction pump 602. At this time, the suction pump 602 can be used to extract the gas in the air guide cylinder 1 and the cover 3, and at the same time, it can also extract the residual water vapor in the air guide cylinder 1, so as to avoid residual air and water vapor in the air guide cylinder 1. After the air in the air guide cylinder 1 is extracted, first close solenoid valve 603 and solenoid valve 606, and then close the suction pump 602. At this time, continue to drive heating component 301 and heating component 402 to heat the test object, and at the same time turn on the UV lamp 302 to simulate the light environment. At this time, through heating and simulated light, the volatilization rate of volatile substances in the test object can be accelerated.

[0069] When volatiles evaporate from the detector, they form a volatile gas cloud. This volatile gas cloud first accumulates in the air guide cylinder 1 below the partition 604. As time goes by, the volatiles accumulate more and more. When the volatiles accumulate to a certain amount, the detector 5 is opened first, and then the solenoid valve 606 is opened. At this time, the volatile gas cloud will be discharged from the outlet pipe 605. After passing through the vertical plate 702, it will be divided into two streams of gas. Then, the two streams of gas will be discharged through the air guide channels 705 on both sides of the circular plate 703 and the guide plate 704, respectively. Since the openings of the air guide channels 705 in both guide plates 704 are facing the center of the circular plate 703, the two volatiles will collide with each other, thereby dispersing the volatiles and dispersing them in the volatile gas cloud, thus improving the uniformity of the volatile distribution. Then, the volatiles will enter the outlet cylinder 707 and be discharged after being guided by the flow guide plate 708.

[0070] After the volatiles are discharged from the exhaust pipe 707, the detector 5 can then perform optical detection on the volatiles.

[0071] Subsequently, the volatiles rise to the air guide 1 and are located at the sealing cap 2. At this time, water is added to the water tank 801 through the water inlet 802. The water lowers the temperature of the protrusion 805 at the bottom of the water tank 801. The pump 803 is then driven to extract the water from the water tank 801. By connecting the output end of the pump 803 to the pipe, the water that has absorbed heat in the water tank 801 can be extracted. At this time, cool water from the outside will continuously enter the water tank 801, thus forming a water circulation and ensuring the surface of the protrusion 805 is protected. In the low-temperature environment of the surface, the volatile substances that have been heated and volatilized will condense when they encounter cold, forming droplets that remain on the surface of the protrusion 805. At this time, the protrusion 805 with an inverted conical cross section can be used to guide the volatile droplets to fall onto the guide block 806. Then, the volatile droplets continue to slide down the inclined surface 808, and finally fall into the collection bottle 807 after passing through the through hole 809. After the collection is completed, the collection bottle 807 can be unscrewed, and chemical reagents can be added to the collection bottle 807 to perform chemical detection of the volatile substances.

Claims

1. An automated detection device for volatile organic compounds from agricultural mulch film, characterized in that, include: The air guide tube (1) has a sealing cap (2) at one end and a cover (3) at the other end. The base plate (4) is installed at the opening of the cover (3) to hold the test object and to seal the cover (3); Heating component 1 (301) is installed inside the housing (3) to generate heat and heat the test object through the housing (3), thereby accelerating the evaporation rate of volatiles in the test object; Heating component 2 (402) is installed inside the base plate (4) to generate heat and heat the test substance through the base plate (4), thereby accelerating the volatilization rate of volatiles in the test substance; The detector (5) is installed inside the gas delivery tube (1) and is used to detect volatiles; A vacuum assembly (6) is provided at the bottom of one side of the air guide cylinder (1). The vacuum assembly (6) includes an exhaust pipe (601) and a partition (604). The exhaust pipe (601) is connected to the bottom of one side of the air guide cylinder (1). A solenoid valve (603) and a vacuum pump (602) are installed in the middle of the exhaust pipe (601). The partition (604) is fixedly connected to the middle of the air guide cylinder (1). An exhaust pipe (605) is fixedly connected to the middle of the partition (604). A solenoid valve (606) is provided on the exhaust pipe (605). A turbulence component (7) is provided in the middle of the air guide tube (1). The turbulence component (7) is located above the vacuum component (6). The turbulence component (7) includes a circular plate one (701). The middle of the circular plate one (701) is fixedly connected to the top of the outer wall of the air outlet pipe (605). A vertical plate (702) is fixedly connected to the middle of the top surface of the circular plate one (701). A circular plate two (703) is fixedly connected to the top of the vertical plate (702). Guide plates (704) are fixedly connected to both sides of the top surface of the circular plate two (703). An air guide channel (705) is provided in the middle of the circular plate two (703) and the guide plate (704). A circular plate three (706) is provided at the top of the guide plate (704). An air outlet tube (707) is connected to the top of the circular plate three (706). A flow guide plate (708) is fixedly connected inside the air outlet tube (707). The opening direction of the air guide channel (705) in the middle of the guide plates (704) on both sides is towards the middle of the circular plate (703). The vertical plate (702) is located in the middle of the opening of the air outlet pipe (605). The circular plate (701), circular plate (703) and circular plate (706) are all fixedly connected to the inner wall of the air guide cylinder (1).

2. The automated detection device for volatile organic compounds from agricultural mulch film according to claim 1, characterized in that, A UV lamp (302) is fixedly connected to the inner wall of the cover (3) for irradiating the object to be detected. An installation tube (501) is connected to the upper middle part of the air guide tube (1), and the detector (5) is installed inside the installation tube (501).

3. The automated detection device for volatile organic compounds from agricultural mulch film according to claim 1, characterized in that, A limiting ring (401) is fixedly connected to the middle of the top surface of the base plate (4), a contact end (403) is connected to one side of the heating component (402), and a contact point (303) is provided at the bottom of the inner side of the cover (3), and the contact point (303) is in contact with the contact end (403).

4. The automated detection device for volatile organic compounds from agricultural mulch film according to claim 1, characterized in that, A sealing strip (304) is fixedly connected to the bottom of the inner wall of the cover (3), and a sealing strip (404) is fixedly connected to the middle edge of the top surface of the bottom plate (4). A recessed part is provided on one side of the sealing strip (404), and a protruding part is provided on one side of the sealing strip (304), and the protruding part and the recessed part are in contact.

5. The automated detection device for volatile organic compounds from agricultural mulch film according to claim 1, characterized in that, The top of the air guide cylinder (1) is also provided with a cooling collection assembly (8). The cooling collection assembly (8) includes a water tank (801), a guide block (806), and a collection bottle (807). The water tank (801) is fixedly connected to the top of the air guide cylinder (1). A delivery pump (803) is fixedly connected to one side of the top of the water tank (801). A delivery pipe (804) is fixedly connected to the input end of the delivery pump (803). The bottom of the delivery pipe (804) is located at the inner bottom of the water tank (801). A water inlet (802) is provided on the other side of the top of the water tank (801). The guide block (806) is fixedly connected to the bottom of the inner wall of the top of the air guide cylinder (1) and is located directly below the water tank (801). The collection bottle (807) is connected to the guide block (806) and is threadedly connected to the air guide cylinder (1).

6. The automated detection device for volatile organic compounds from agricultural mulch film according to claim 5, characterized in that, The top of the guide block (806) is provided with a slope (808), the middle part of the guide block (806) is provided with a through hole (809), and the collection bottle (807) is connected to the through hole (809).

7. The automated detection device for volatile organic compounds from agricultural mulch film according to claim 5, characterized in that, The bottom surface of the water tank (801) is fixedly connected to a protrusion (805), the cross section of the protrusion (805) is an inverted cone shape, and the protrusion (805) is located directly above the guide block (806).

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