Automatic detection device for volatile matters in farmland mulching film

Abstract

The invention relates to the technical field of mulching film volatile matter detection, and discloses a farmland mulching film volatile matter automatic detection device, which comprises a gas guide cylinder, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe and a gas outlet pipe, the bottom plate is arranged at the opening of the housing and is used for containing a detected object and sealing the housing; the heating assembly I is mounted in the housing and is used for heating the detected object through the housing; the second heating assembly is installed in the bottom plate and used for heating the detected object through the bottom plate, and then the volatilization speed of volatile matter in the detected object is increased; and the detector is used for detecting volatile matters. The gas guide cylinder is communicated with the housing, and the gas guide cylinder and the housing are sealed through the sealing cover and the bottom plate respectively, so that a closed detection environment is formed, and the problem that the accuracy of a final detection result is influenced due to the influence of external environmental factors on the detection process in the detection process can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mulch volatile detection, in particular to an automatic detection device for farmland mulch volatiles. BACKGROUND

[0002] As a key measure in modern agricultural production, mulch covering technology has been widely used. By laying plastic film on the surface of farmland, soil temperature can be significantly improved, soil humidity can be maintained, weed growth can be effectively inhibited, and the occurrence of diseases and pests can be reduced, thereby creating a stable and superior growth environment for crops, and ultimately achieving the purpose of improving crop yield and product quality. Therefore, mulch laying is of great importance to food security and agricultural income growth.

[0003] However, as a plastic product, farmland mulch usually adds plasticizers, stabilizers, antioxidants and other chemical additives during its production process. When used in the field, the mulch is gradually aged and degraded under long-term exposure to sunlight (ultraviolet) and high temperature environment, resulting in the release of these chemical additives and their degradation products in the form of volatile organic compounds (VOCs). These volatiles not only can migrate to the soil and air to cause environmental pollution, but also can be absorbed by crops, thereby affecting the quality and safety of agricultural products, and posing potential threats to the ecological environment and human health. Therefore, accurate and reliable detection of farmland mulch volatiles is crucial for environmental risk assessment and supervision of agricultural product safety.

[0004] At present, there are obvious deficiencies in the detection means of mulch volatiles. The existing detection methods mostly rely on in-situ, open sampling analysis in the field or direct measurement using portable equipment. This method is easily disturbed by external environmental factors: the constantly changing conditions of wind speed, air temperature and humidity in the field will directly affect the diffusion and concentration of volatiles, resulting in large fluctuations in measurement data and difficulty in reproduction. In addition, the moisture contained in the soil and mulch will evaporate to form water vapor after being heated, which will interfere with the target volatiles and many detectors; at the same time, the volatiles are mixed with a large amount of environmental air during sampling, which also reduces the sensitivity of detection. Most importantly, the release of volatiles itself is uneven in time and space, and the existing means lack the step of homogenizing the collected gas, resulting in the unrepresentativeness of the collected sample. In summary, due to the environmental interference, the inability to exclude the influence of water vapor and air, and the inability to ensure the uniformity of the sample, the accuracy and reliability of the detection results of the existing detection technology are greatly reduced. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides an automatic detection device for farmland mulch volatile substances, which solves the problem of the prior detection technology that is susceptible to environmental interference, cannot eliminate the influence of water vapor and air, and cannot guarantee the uniformity of the sample, thereby reducing the accuracy and reliability of the detection results.

[0006] To achieve the above object, the present application is implemented by the following technical solutions: an automatic detection device for farmland mulch volatile substances, comprising:

[0007] The gas guide cylinder is provided with a sealing cover at one end and a cover at the other end;

[0008] The bottom plate is installed at the opening of the cover and is used to hold the detection object and seal the cover;

[0009] The heating assembly one is installed inside the cover and is used to generate heat and heat the detection object through the cover, thereby accelerating the volatilization speed of the volatile substances in the detection object;

[0010] The heating assembly two is installed inside the bottom plate and is used to generate heat and heat the detection object through the bottom plate, thereby accelerating the volatilization speed of the volatile substances in the detection object;

[0011] The detector is installed in the gas guide cylinder and is used to detect the volatile substances.

[0012] Preferably, the inner wall of the cover is fixedly connected with a UV lamp for irradiating the detection object, and the middle upper part of the gas guide cylinder is communicated with a mounting pipe, and the detector is installed in the mounting pipe.

[0013] Preferably, the middle part of the top surface of the bottom plate is fixedly connected with a limiting ring, one side of the heating assembly two is connected with a contact end, the inner bottom part of the cover is provided with a contact point, and the contact point is in contact with the contact end.

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

[0015] Preferably, the bottom part of one side of the gas guide cylinder is provided with a vacuum assembly, the vacuum assembly comprises an exhaust pipe and a partition plate, the exhaust pipe is communicated with the bottom part of one side of the gas guide cylinder, an electromagnetic valve one and a suction pump are installed in the middle part of the exhaust pipe, the partition plate is fixedly connected in the middle part of the gas guide cylinder, an air outlet pipe is fixedly connected to the middle part of the partition plate, and the air outlet pipe is provided with an electromagnetic valve two.

[0016] Preferably, a turbulence component is arranged in the middle of the air guide cylinder, the turbulence component is above the vacuum component, the turbulence component comprises a circular plate one, the middle of the circular plate one is fixedly connected to the top of the outer wall of the air outlet pipe, the top surface of the circular plate one is fixedly connected with a vertical plate, the top of the vertical plate is fixedly connected with a circular plate two, the top surface of the circular plate two is fixedly connected with a guide plate on both sides, the middle of the circular plate two and the guide plate are provided with air guide channels, the top of the guide plate is provided with a circular plate three, the top of the circular plate three is communicated with an air outlet cylinder, and the inside of the air outlet cylinder is fixedly connected with a flow guide plate.

[0017] Preferably, the opening direction of the air guide channel in the middle of the guide plate on both sides is towards the middle of the circular plate two, the vertical plate is located in the middle of the air outlet pipe opening, and the circular plate one, the circular plate two and the circular plate three are fixedly connected to the inner wall of the air guide cylinder.

[0018] Preferably, the top of the air guide cylinder is further provided with a cooling and collecting component, the cooling and collecting component comprises a water tank, a guide block and a collecting bottle, the water tank is fixedly connected to the top of the air guide cylinder, one side of the top of the water tank is fixedly connected with a conveying pump, the input end of the conveying pump is fixedly connected with a conveying pipe, the bottom of the conveying pipe is located in the inner bottom of the water tank, the other side of the top of the water tank is provided with a water inlet, the guide block is fixedly connected to the bottom of the inner wall of the top of the air guide cylinder, and the guide block is located directly below the water tank, the collecting bottle is communicated with the guide block, and the collecting bottle is screwed with 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 collecting bottle is communicated with the through hole.

[0020] Preferably, the bottom surface of the water tank is fixedly connected with a protruding block, the cross section of the protruding block is inverted conical, and the protruding block is located directly above the guide block.

[0021] The application provides a kind of automatic detection device of agricultural field mulching film volatile substance.It has the following beneficial effects:

[0022] 1, the application is connected by the air guide cylinder and the shell, the air guide cylinder and the shell are sealed by sealing cover and bottom plate respectively, and a closed detection environment is formed, so that the influence of external environmental factors on the detection process can be avoided during detection, and the accuracy of the final detection result is affected.

[0023] 2, the application can heat the detection object by using heating assembly one and heating assembly two, which can evaporate the moisture contained in the detection object, and then continue to heat the detection object to accelerate the volatilization of volatile substances, and open the UV lamp at the same time, so as to avoid the confusion of water vapor and volatile substances, and to avoid the confusion of water vapor and volatile substances, so as to avoid the confusion of water vapor and volatile substances.

[0024] 3、The application can avoid the mixing of residual air in the air guide cylinder and volatile matter by first extracting the air in the air guide cylinder and then heating the detection object, so as to further improve the accuracy of the detection result.

[0025] 4、The application can improve the uniformity of the mixing of volatile matter in the gas by installing the air disturbance assembly in the air guide cylinder, separating the gas discharged from the air outlet pipe into two streams by the vertical plate, and mixing the two streams of gas through the air guide channel, and finally discharging from the air outlet cylinder, so as to ensure the accuracy of the detection result.

[0026] 5、The application can perform optical detection of volatile matter by using the detector, and after adding water in the water tank, the volatile matter volatilized by heating can be cooled to produce condensation phenomenon, guided by the protruding block to drop on the guide block, and finally enter the collection bottle along the inclined surface and the through hole, at this time, the collection of volatile matter can be completed, and finally by taking down the collection bottle, chemical reagent can be added dropwise for chemical detection, so as to realize the purpose of optical and chemical double monitoring, and the two detection results can be verified with each other to improve the reliability of the detection result. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of the application;

[0028] Figure 2 is a front view of the shell of the application;

[0029] Figure 3 is Figure 2 is an enlarged view of A in

[0030] Figure 4 is a partial structure exploded view of the shell of the application;

[0031] Figure 5 is a partial structure exploded view of the bottom plate of the application;

[0032] Figure 6 is a front view of the vacuum assembly of the application;

[0033] Figure 7 is an enlarged view of B in Figure 6

[0034] Figure 8 is a top view of the deflector of the application;

[0035] Figure 9 is a front view of the cooling and collecting assembly of the application;

[0036] Figure 10 is a partial structure schematic diagram of the detector of the application.

[0037] ​Wherein, 1, the air cylinder; 2, sealing cover; 3, cover; 301, heating assembly one; 302, UV lamp; 303, contact; 304, sealing strip one; 4, bottom plate; 401, limit ring; 402, heating assembly two; 403, contact end; 404, sealing strip two; 5, probe; 501, installation tube; 6, vacuum assembly; 601, exhaust pipe; 602, air pump; 603, electromagnetic valve one; 604, partition; 605, air outlet pipe; 606, electromagnetic valve two; 7, air disturbance assembly; 701, round plate one; 702, vertical plate; 703, round plate two; 704, guide plate; 705, air guide channel; 706, round plate three; 707, air outlet cylinder; 708, guide plate; 8, cooling and collecting assembly; 801, water tank; 802, water inlet; 803, delivery pump; 804, delivery pipe; 805, protrusion; 806, guide block; 807, collection bottle; 808, inclined plane; 809, through hole. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the specification of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0039] In order to better understand the present application, the above will be described in detail below in combination with specific embodiments.

[0040] Please refer to the drawings in the specification of the present application Figure 1 - the drawings in the specification of the present application Figure 10 The embodiment of the present application provides a kind of automatic detection device for farmland mulch volatile, including: air cylinder 1, one end is provided with sealing cover 2, the other end is connected with cover 3;Bottom plate 4, it is installed at the opening of cover 3, for holding detection object, and sealing cover 3;Heating assembly one 301, it is installed in cover 3 interior, for generating heat, and detection object is heated by cover 3, to further accelerate the volatilization speed of volatile in detection object;Heating assembly two 402, it is installed in bottom plate 4 interior, for generating heat, and detection object is heated by bottom plate 4, to further accelerate the volatilization speed of volatile in detection object;Probe 5, it is installed in air cylinder 1, for detecting volatile.

[0041] In this embodiment, the air guide cylinder 1 is connected with the cover 3, and the opening of the air guide cylinder 1 is sealed by the sealing cover 2, and the opening of the cover 3 is sealed by the bottom plate 4, so that the detection object is placed on the bottom plate 4, and then the cover 3 is clamped with the bottom plate 4, at this time, a closed space is formed between the cover 3, the bottom plate 4, the air guide cylinder 1 and the sealing cover 2, and a closed detection space is formed, so that the influence of the external environment (such as wind and dust) on the test environment can be eliminated, thereby improving the accuracy of the test result, and by arranging the heating assembly one 301 in the cover 3 and the heating assembly two 402 in the bottom plate 4, the bidirectional heating of the detection object can be realized, so that the detection object can be heated more quickly and uniformly, the excess water in the sample can be evaporated and discharged, and the volatilization rate of the target volatile substance can be accelerated.

[0042] Please refer to the accompanying drawings Figure 1 and Figure 2 The inner wall of the cover 3 is fixedly connected with a UV lamp 302 for irradiating the detection object, the middle upper part of the air guide cylinder 1 is communicated with a mounting pipe 501, and the detector 5 is mounted in the mounting pipe 501. The middle of the top surface of the bottom plate 4 is fixedly connected with a limiting ring 401, one side of the heating assembly two 402 is connected with a contact end 403, and the inner bottom of the cover 3 is provided with a contact point 303 which is in contact with the contact end 403.

[0043] In this embodiment, the UV lamp 302 can simulate the light environment, so as to reproduce the volatile substances generated by the ground film under the sunlight in the field, thereby further accelerating the volatilization speed of the volatile substances in the detection object, and through the contact point 303, the contact end 403 of the heating assembly two 402 can form a path when the cover 3 and the bottom plate 4 are buckled, and the detector 5 can be used for optical detection of the volatile substances. Specifically, the specific wavelength light beam emitted by the detector 5 can penetrate the gas, if the target volatile substance molecules in the volatile substances can absorb the wavelength light, the light beam intensity will be attenuated, at this time, the photoelectric sensor located at the end of the light path is responsible for receiving the light signal after penetrating the gas, and converting the intensity into an electrical signal. Finally, by comparing the initial light intensity of the light source and the attenuated light intensity received by the sensor, the real-time concentration of the volatile substances can be accurately calculated according to the Lambert-Beer law, so as to complete the analysis of the volatile substances, and the detector 5 can be selected from 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 well known in the art, which will not be described here.

[0044] And in another embodiment,

[0045] In order to facilitate on-site real-time observation, the device is further provided with a display screen (not shown in the figure) at the top of the air guide cylinder 1, which is electrically connected with the signal processor of the detector 5. The real-time concentration data of volatile matter calculated by the detector 5 can be directly displayed on the screen in the form of numbers or curves, so that the operator can intuitively master the dynamic change of volatile matter without connecting an external computer.

[0046] According to the type of the detector 5 selected, the device can detect a variety of common harmful volatile matters of mulch. Specifically, the detector 5 can be selected from one or a combination of the following types:

[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, xylene (BTEXs) and some volatile monomers of plasticizers (such as phthalate esters) that may be produced during the degradation of mulch.

[0048] Semiconductor gas sensor: It can detect a variety of reducing gases, including carbon monoxide (CO), hydrogen sulfide (H2S) and a variety of volatile organic compounds (VOCs).

[0049] Therefore, users can select the most suitable detector module for the device according to the type of the main pollutant they are concerned about, so as to achieve targeted and high-precision online monitoring of specific harmful substances. The detector 5 is a standard optical detection module in the prior art, and its specific structure is well known in the art, which will not be described here.

[0050] Please refer to the attached Figure 2 and Figure 3 The inner wall of the cover shell 3 is fixedly connected with a sealing strip one 304 at the bottom, and the middle edge of the top surface of the bottom plate 4 is fixedly connected with a sealing strip two 404. One side of the sealing strip two 404 is provided with a recess, and one side of the sealing strip one 304 is provided with a protrusion, and the protrusion and the recess are in contact.

[0051] In this embodiment, the sealing strip one 304 and the sealing strip two 404 can improve the sealing performance between the cover shell 3 and the bottom plate 4, and the mutual locking purpose can be achieved by the mutual engagement of the protrusion and the recess, thereby preventing the relative displacement of the two, so as to ensure the sealing performance of the device.

[0052] Please refer to the attached Figure 1 and Figure 6The bottom of one side of the air guide cylinder 1 is provided with a vacuum assembly 6, which comprises an exhaust pipe 601 and a partition plate 604, the exhaust pipe 601 is communicated with the bottom of one side of the air guide cylinder 1, the middle part of the exhaust pipe 601 is provided with an electromagnetic valve one 603 and an air pump 602, the partition plate 604 is fixedly connected to the middle part of the air guide cylinder 1, the middle part of the partition plate 604 is fixedly connected with an air outlet pipe 605, and the air outlet pipe 605 is provided with an electromagnetic valve two 606.

[0053] In the embodiment, after the water vapor in the to-be-tested object is discharged during heating, the sealing cover 2 is tightened, at this time, the electromagnetic valve one 603 and the electromagnetic valve two 606 are opened, and then the air pump 602 is driven to discharge the gas in the device, thereby forming a vacuum environment, and the residual water vapor can also be discharged, so as to provide a pure detection environment for detection and eliminate the influence of external factors on the detection result.

[0054] Please refer to the accompanying drawings Figures 6-8 The middle part of the air guide cylinder 1 is provided with a turbulence assembly 7, which is above the vacuum assembly 6, the turbulence assembly 7 comprises a circular plate one 701, the middle part of the circular plate one 701 is fixedly connected to the top of the outer wall of the air outlet pipe 605, the middle part of the top surface of the circular plate one 701 is fixedly connected with a vertical plate 702, the top of the vertical plate 702 is fixedly connected with a circular plate two 703, both sides of the top surface of the circular plate two 703 are fixedly connected with guide plates 704, the middle parts of the circular plate two 703 and the guide plates 704 are provided with air guide channels 705, the top of the circular plate two 703 is provided with a circular plate three 706, the circular plate three 706 is communicated with an air outlet cylinder 707, and the inside of the air outlet cylinder 707 is fixedly connected with a flow guide plate 708. The opening directions of the air guide channels 705 in the middle parts of the two guide plates 704 are both towards the middle part of the circular plate two 703, the vertical plate 702 is located in the middle part of the opening of the air outlet pipe 605, and the circular plate one 701, the circular plate two 703 and the circular plate three 706 are all fixedly connected to the inner wall of the air guide cylinder 1.

[0055] In the embodiment, the vertical plate 702 in the turbulence assembly 7 can divide the volatile gas group into two air flows, at this time, the two air flows will be discharged along the two air guide channels 705 respectively, and the inhomogeneous gas group with possible local concentration difference can be dispersed by guiding, and then mixed again between the circular plate two 703 and the circular plate three 706, so as to ensure the uniformity of the distribution of volatile substances in the volatile gas group, thereby further ensuring the accuracy of detection.

[0056] Please refer to the accompanying drawings Figure 9 and Figure 10The top of the air guide cylinder 1 is further provided with a cooling and collecting assembly 8, which comprises a water tank 801, a guide block 806 and a collecting 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 arranged at 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 collecting bottle 807 is in communication with the guide block 806 and is threadedly connected to the air guide cylinder 1. An inclined surface 808 is arranged at the top of the guide block 806. A through hole 809 is arranged at the middle of the guide block 806 and is in communication with the collecting bottle 807. A protrusion 805 is fixedly connected to the bottom surface of the water tank 801. The protrusion 805 is in the shape of an inverted cone and 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 of the water tank 801. The surface of the inverted protrusion 805 can provide a condensation position for volatile substances. After the hot gas flow of the volatile substances after optical detection contacts the surface, condensation phase change occurs, forming liquid drops, which then fall on the guide block 806 directly below the protrusion 805. The inclined surface 808 of the guide block 806 is arranged, so that the liquid drops are further guided to slide into the through hole 809 and finally into the collecting bottle 807. At this time, the collecting bottle 807 can be unscrewed, and chemical reagents can be added dropwise for chemical detection.

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

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

[0060] Target substance: phthalate plasticizer (such as DEHP, DBP, etc.).

[0061] Detection method: commercially available rapid detection kit can be used. The condensate in the collecting bottle is added dropwise into the detection test paper or reagent tube. The developing agent in the reagent will have a specific color reaction with the target substance. For example, if the sample contains phthalate, the solution may show a distinct purple or blue color within a few minutes. By observing the color depth and comparing it with the standard color card, it can be quickly judged whether the harmful substance exists and its approximate concentration range;

[0062] Laboratory accurate detection:

[0063] Target substance: 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 professional analytical instruments are used for detection. For example, high performance liquid chromatography (HPLC) or gas chromatography-mass spectrometer (GC-MS) can be used for analysis. Through these precision instruments, not only can the specific harmful chemical components contained in the volatile matter be accurately identified, but also the content of each component can be accurately measured to obtain precise data at the ppb (parts per billion) level.

[0065] Working principle: When in use, first separate the cover 3 and the bottom plate 4, then place the bottom plate 4, then place the test object (soil or mulch) in the limiting ring 401 on the bottom plate 4, and then snap the cover 3 on top of the bottom plate 4.

[0066] When snapped, the sealing strip one 304 and the sealing strip two 404 will contact each other, and at this time the protruding part on one side of the sealing strip one 304 will snap into the recessed part on one side of the sealing strip two 404, thereby ensuring the sealing between the cover 3 and the bottom plate 4.

[0067] Then open the sealing cover 2 and drive the heating assembly one 301 and the heating assembly two 402 to operate, at this time the heat generated by the heating assembly one 301 will first be transmitted to the cover 3, and then to the test object on the bottom plate 4, thereby achieving heating of the test object, and the heating assembly two 402 can heat the test object through the bottom plate 4, so through the cooperation of the heating assembly one 301 and the heating assembly two 402, the moisture in the test object can be heated to be discharged along the air cylinder 1.

[0068] After the moisture is discharged, first tighten the sealing cover 2 on top of the air cylinder 1, then open the electromagnetic valve one 603 and the electromagnetic valve two 606, and then drive the air pump 602, at this time the air pump 602 can be used to pump out the gas in the air cylinder 1 and the cover 3, and also can pump out the water vapor remaining in the air cylinder 1, so as to avoid the remaining air and water vapor in the air cylinder 1, when the air in the air cylinder 1 is pumped out, first close the electromagnetic valve one 603 and the electromagnetic valve two 606, and then close the air pump 602, at this time continue to drive the heating assembly one 301 and the heating assembly two 402 to heat the test object, and at the same time open the UV lamp 302 to simulate the light environment, at this time through heating and simulated light, the volatilization speed of volatile substances in the test object can be accelerated.

[0069] When the volatile matter volatilizes from the detection object, a volatile matter gas group is formed. At this time, the volatile matter gas group is first accumulated in the air guide cylinder 1 below the partition 604. With the passage of time, the volatile matter is accumulated more and more. When the volatile matter is accumulated to a certain amount, the detector 5 is first opened, and then the electromagnetic valve two 606 is opened. At this time, the volatile matter gas group is discharged from the air outlet pipe 605, and then is divided into two gas streams through the vertical plate 702. Then, the two gas streams are discharged through the air guide channels 705 on both sides of the circular plate two 703 and the guide plate 704. Since the openings of the air guide channels 705 in the guide plates 704 on both sides are towards the middle part of the circular plate two 703, the two streams of volatile matter collide with each other, so that the volatile matter is dispersed, thereby improving the uniformity of the distribution of the volatile matter. Then, the volatile matter enters the air outlet cylinder 707 and is discharged after being guided by the flow guide plate 708.

[0070] When the volatile matter is discharged from the air outlet cylinder 707, the detector 5 can perform optical detection on the volatile matter.

[0071] Then, the volatile matter rises to the position of the sealing cover 2 in the air guide cylinder 1. At this time, water is added to the water tank 801 through the water inlet 802. Then, the water tank 801 is connected to the temperature reducing protrusion 805 at the bottom thereof by using water. At this time, the driving delivery pump 803 can pump out the water in the water tank 801. By connecting the pipeline to the output end of the delivery pump 803, the water in the water tank 801 which has absorbed heat can be pumped out. At this time, the outside cool water continuously enters the water tank 801, thereby forming a water circulation, thereby ensuring the low temperature environment on the surface of the protrusion 805. The volatile matter after being heated and volatilized will produce condensation phenomenon after being cooled, thereby forming liquid drops remaining on the surface of the protrusion 805. At this time, the protrusion 805 with a reverse tapered cross section can guide the volatile matter liquid drops to drop on the guide block 806. Then, the volatile matter liquid drops continue to slide along the inclined surface 808, and finally drop into the collection bottle 807 through the through hole 809. When the collection is completed, the collection bottle 807 is unscrewed, and chemical reagents are added dropwise into the collection bottle 807 for chemical detection of the volatile matter.

Claims

1. An automatic detection device for volatile substances of agricultural mulching film, characterized in that, Include: Air cylinder (1), one end is provided with a sealed cover (2), the other end is connected with the cover (3); The bottom plate (4) is installed at the opening of the cover (3), which is used for containing the detection object and sealing the cover (3); Heating assembly one (301) is installed inside the cover (3), which is used for generating heat and heating the detection object through the cover (3), thereby accelerating the volatilization speed of volatile matter in the detection object; Heating assembly two (402) is installed inside the bottom plate (4), which is used for generating heat and heating the detection object through the bottom plate (4), thereby accelerating the volatilization speed of volatile matter in the detection object; The detector (5) is installed in the air cylinder (1) for detecting volatile matter. 2.The farmland mulching film volatile automatic detection device according to claim 1, characterized in that, The inner wall of the cover (3) is fixedly connected with a UV lamp (302) for irradiating the detection object, and the upper middle part of the air cylinder (1) is communicated with a mounting pipe (501), and the detector (5) is installed in the mounting pipe (501). 3.The device according to claim 1, wherein, The middle part of the top surface of the bottom plate (4) is fixedly connected with a limiting ring (401), one side of the heating assembly two (402) is connected with a contact end (403), the inner bottom of the cover (3) is provided with a contact point (303), and the contact point (303) is in contact with the contact end (403). 4.The farmland mulching film volatile automatic detection device according to claim 1, characterized in that, The bottom of the inner wall of the cover (3) is fixedly connected with a sealing strip one (304), the middle edge of the top surface of the bottom plate (4) is fixedly connected with a sealing strip two (404), one side of the sealing strip two (404) is provided with a recess, one side of the sealing strip one (304) is provided with a protrusion, and the protrusion and the recess are in contact.

5. The device according to claim 1, wherein, The bottom of one side of the air cylinder (1) is provided with a vacuum assembly (6), the vacuum assembly (6) comprises an exhaust pipe (601) and a partition (604), the exhaust pipe (601) is communicated with the bottom of one side of the air cylinder (1), the middle part of the exhaust pipe (601) is provided with an electromagnetic valve one (603) and an air pump (602), the partition (604) is fixedly connected in the middle part of the air cylinder (1), the middle part of the partition (604) is fixedly connected with an air outlet pipe (605), and the air outlet pipe (605) is provided with an electromagnetic valve two (606). 6.The device according to claim 5, wherein, The middle part of the air cylinder (1) is provided with a turbulence assembly (7), the turbulence assembly (7) is above the vacuum assembly (6), the turbulence assembly (7) comprises a circular plate one (701), the middle part of the circular plate one (701) is fixedly connected with the top of the outer wall of the air outlet pipe (605), the top surface of the circular plate one (701) is fixedly connected with a vertical plate (702), the top of the vertical plate (702) is fixedly connected with a circular plate two (703), the top surface of the circular plate two (703) is fixedly connected with a guide plate (704) on both sides, the middle part of the circular plate two (703) and the guide plate (704) is provided with a gas guide channel (705), the top of the guide plate (704) is provided with a circular plate three (706), the top of the circular plate three (706) is communicated with an air outlet cylinder (707), and the inside of the air outlet cylinder (707) is fixedly connected with a flow guide plate (708).

7. The device according to claim 6, wherein the device is characterized by, The opening direction of the air guide passage (705) in the middle of the guide plate (704) on both sides is towards the middle of the second circular plate (703), the vertical plate (702) is in the middle of the opening of the air outlet pipe (605), and the first circular plate (701), the second circular plate (703) and the third circular plate (706) are fixedly connected to the inner wall of the air guide cylinder (1). 8.The farmland mulching film volatile automatic detection device according to claim 1, characterized in that, The top of the air guide cylinder (1) is further provided with a cooling and collecting assembly (8), the cooling and collecting assembly (8) comprises a water tank (801), a guide block (806) and a collecting bottle (807), the water tank (801) is fixedly connected to the top of the air guide cylinder (1), one side of the top of the water tank (801) is fixedly provided with a conveying pump (803), the input end of the conveying pump (803) is fixedly connected with a conveying pipe (804), the bottom of the conveying pipe (804) is located at the inner bottom of the water tank (801), the other side of the top of the water tank (801) is provided with a water inlet (802), the guide block (806) is fixedly connected to the bottom of the inner wall of the top of the air guide cylinder (1), and the guide block (806) is located directly below the water tank (801), the collecting bottle (807) is in communication with the guide block (806), and the collecting bottle (807) is screwedly connected with the air guide cylinder (1). 9.The device according to claim 8, wherein, The top of the guide block (806) is provided with an inclined surface (808), the middle of the guide block (806) is provided with a through hole (809), and the collecting bottle (807) is in communication with the through hole (809). 10.The device according to claim 8, wherein, The bottom surface of the water tank (801) is fixedly connected with a protruding block (805), the cross section of the protruding block (805) is inverted conical, and the protruding block (805) is located directly above the guide block (806).

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