Pesticide residue detection device based on gas chromatography

Abstract

The utility model discloses a pesticide residue detection device based on gas chromatography, and aims to provide a pesticide residue detection device based on gas chromatography, which can reduce the probability of inaccurate detection caused by insufficient sealing performance. The device comprises a device tank and a working rotating tank, the working rotating tank is detachably connected with the device tank, a first gas tank is communicated with a first open pore, one end of a non-polar chromatographic column is communicated with a second open pore, the other end of the non-polar chromatographic column is communicated with a third open pore, one end of a polar chromatographic column is communicated with a fourth open pore, the other end of the polar chromatographic column is communicated with a detector, and a second gas tank is communicated with a fifth open pore. The tail gas treatment box is communicated with the sixth open hole, the second through hole is communicated with the first through hole, the fourth through hole is communicated with the third through hole, and the sixth through hole is communicated with the fifth through hole. The beneficial effects of the utility model are that: the purpose of reducing the probability of inaccurate detection caused by insufficient sealing performance can be achieved; the rotation control work of the working rotation tank is facilitated; and a gas treatment device is installed.

Description

Technical Field

[0001] The utility model relates to the technical field of gas chromatography detection, in particular to a pesticide residue detection device based on gas chromatography. Background Art

[0002] Gas chromatography is a chromatographic technique used in organic chemistry to separate and analyze compounds that are easily volatile and do not decompose. Typical applications include testing the purity of a specific compound and separating the components in a mixture while also determining the relative content of each component. In some cases, gas chromatography may also be helpful for the characterization of compounds.

[0003] As a major agricultural country, the use of pesticides is very large. However, as a mixture of chemicals, pesticides can kill insects, fungi and other organisms that harm the growth of crops. However, when sprayed on crops, they may remain there. When eating crops, the residual pesticides may cause poisoning, which is harmful to the body and requires constant vigilance. Gas chromatography, which is used for the separation and analysis of chemicals, can be used immediately. Of course, for devices that use gas chromatography for pesticide residue detection, it is necessary to be convenient to use and to provide corresponding treatment methods for various possible problems.

[0004] China Patent Authorization Announcement Number: CN210572143U, authorization announcement date May 19, 2020, discloses a universal device for gas chromatography determination of solvent residues in pesticide technical, including a purge inlet, a non-polar chromatographic column, a six-way switching valve, a polar chromatographic column, a purge air inlet, a detector and an exhaust gas treatment device. The purge inlet, purge air inlet and exhaust gas treatment device are all connected to the six-way switching valve, both ends of the non-polar chromatographic column are connected to the six-way switching valve, one end of the polar chromatographic column is connected to the six-way switching valve, and the other end of the polar chromatographic column is connected to the detector. The shortcoming of this technical solution is that when performing the detection work, the first opening, the second opening, the third opening, the fourth opening, the fifth opening and the sixth opening are opened and closed by controlling the six-way switching valve. Although the direction of the gas introduced can be controlled in this way, the frequent indirect opening and closing of the valve not only causes damage due to the lack of continuity, but also may affect the flow of gas due to the sealing performance of the valve installation. This will cause errors in the detection of solvent residues in the pesticide technical, which will affect the test results.

[0005] In summary, a device for replacing gas flow channels can be provided without valve control, thereby reducing the influence of valves. Utility Model Content

[0006] The utility model aims to overcome the shortcomings of the valve working effect in the prior art and to provide a pesticide residue detection device based on gas chromatography, which can reduce the probability of inaccurate detection due to insufficient sealing.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A pesticide residue detection device based on gas chromatography includes a device tank and a working rotating tank, the working rotating tank is set in the device tank, the working rotating tank and the device tank are detachably connected, the device tank is equipped with a gas box 1, a gas box 2, a detector and an exhaust gas treatment box, the device tank is provided with an opening 1, an opening 2, an opening 3, an opening 4, an opening 5 and an opening 6, the opening 1, the opening 2, the opening 3, the opening 4, the opening 5 and the opening 6 are distributed in a ring shape with the center of the device tank as the base point, the gas box 1 is connected to the opening 1, a non-polar chromatographic column is installed at the opening 2, one end of the non-polar chromatographic column is connected to the opening 2, The other end of the non-polar chromatographic column is connected to opening three, and polar chromatographic columns are installed at the four openings. One end of the polar chromatographic column is connected to opening four, and the other end of the polar chromatographic column is connected to the detector. The gas box two is connected to opening five, and the exhaust gas treatment box is connected to opening six. The working rotating tank is provided with through hole one, through hole two, through hole three, through hole four, through hole five and through hole six. The through hole one, through hole two, through hole three, through hole four, through hole five and through hole six are distributed in a ring shape with the center of the working rotating tank as the base point. The through hole two is connected to through hole one, the through hole four is connected to through hole three, and the through hole six is connected to through hole five.

[0009] This design allows the device tank and the working rotating tank to be assembled into a detection device. The working rotating tank is installed inside the device tank. This not only protects the working rotating tank from the device tank, but also reduces the possibility of the working rotating tank being affected by external objects and not being able to work smoothly or at all. The working rotating tank is detachably connected to the device tank, which means that the working rotating tank can rotate smoothly under the support of the device tank, thereby driving the rotation of components or structures on the working rotating tank. The device tank is equipped with gas box one, gas box two, a detector and an exhaust gas treatment box, and is provided with opening one, opening two, opening three, opening four, opening five and opening six. Of course, opening one, opening two, opening three, opening four, opening five and opening six are distributed in a ring shape with the center of the device tank as the base point. The gas box one here is connected with opening one, so some agricultural residues that need to be detected can be placed in gas box one and flow through opening one, and one end of the non-polar chromatographic column is connected with opening two, and the other end is connected with opening three, so that the gas can flow between opening two and opening three, so as to pass the detection work of the non-polar chromatographic column. Similarly, one end of the polar chromatographic column is connected with opening four, and the other end is connected with the detector, so that the gas can flow between opening four and the detector, so as to pass the detection work of the polar chromatographic column. It should be noted that air box two is connected to opening five, and the exhaust gas treatment box is connected to opening six. Therefore, another part of the agricultural residue that needs to be tested can be placed in air box two and finally flowed to the exhaust gas treatment box for treatment. Of course, the fluidity of opening one, opening two, opening three, opening four, opening five and opening six here requires components, and the working rotating tank mounted in the device tank is provided with through hole one, through hole two, through hole three, through hole four, through hole five and through hole six. Through hole one, through hole two, through hole three, through hole four, through hole five and through hole six here are distributed in a ring shape with the center of the working rotating tank as the base point, through hole two is connected with through hole one, through hole four is connected with through hole three, through hole six is connected with through hole five, so in the rotation control of the working rotating tank, through hole one, through hole two, through hole three, through hole four, through hole five and through hole six on the working rotating tank can be controlled to rotate until they are aligned with opening one, through hole two, through hole three, through hole four, through hole five and through hole six on the device tank, so that the volatilized gas from the agricultural residue can be smoothly guided and detected. When the gas passes through opening 1, through hole 1, through hole 2 and opening 2 in sequence, it can be placed in the non-polar chromatographic column. After passing through the non-polar chromatographic column, it can pass through opening 3, through hole 3, through hole 4 and opening 4 in sequence to enter the polar chromatographic column and then enter the detector. In this way, the gas is tested. The non-polar chromatographic column and the polar chromatographic column here are used to separate agricultural residues in order to achieve quantitative analysis of various residual substances in agricultural residues. Of course, when it is necessary to process agricultural residues, the working rotary tank can be rotated to connect opening 5 with through hole 4, so that the gas can be processed smoothly.Of course, the gas-guided flow adjustment work here is to control the rotation of the working rotating tank so that the through holes one, two, three, four, five and six on the working rotating tank are controlled to rotate, so as to achieve the purpose of aligning the openings one, two, three, four, five and six on the device tank. Such work does not set the switch of the valve, that is, it avoids the lack of gas flow leakage due to the sealing of the valve. Of course, such operation can achieve the purpose of reducing the probability of inaccurate detection due to insufficient sealing.

[0010] Preferably, a socket is provided at the top of the device tank, the diameter of the socket is larger than the diameter of the working rotating tank, a chassis is installed at the bottom of the device tank, the chassis is detachably connected to the device tank, and the working rotating tank is detachably connected to the chassis. This design sets a socket at the top of the device tank, making the diameter of the socket larger than the diameter of the working rotating tank, so that the diameter of the working rotating tank can be controlled to be inserted from the socket, and a chassis is installed at the bottom of the device tank, and the chassis is detachably connected to the device tank, so that the working rotating tank can be limited to the chassis. Here, the working rotating tank is detachably connected to the chassis, that is, the working rotating tank can be rotated under the limiting effect of the chassis to drive the rotation of through hole one, through hole two, through hole three, through hole four, through hole five and through hole six on the working rotating tank to guide the flow of gas.

[0011] Preferably, a lid is mounted on the top of the working rotating tank, detachably connected to the working rotating tank, and the bottom of the working rotating tank is detachably connected to the chassis. This design allows the lid to be controlled to open and close the top of the working rotating tank. The bottom of the working rotating tank is also detachably connected to the chassis, allowing the working rotating tank to rotate smoothly under the support and limit of the chassis, thereby driving the rotation of through holes one, two, three, four, five, and six.

[0012] Preferably, the device tank is equipped with a motor and several connecting shafts, the motor is equipped with a motor shaft, the motor shaft is detachably connected to the tank cover, and the several connecting shafts are symmetrically distributed with the tank cover as the center, the bottom end of the connecting shaft is connected to the device tank, and the top end of the connecting shaft is connected to the motor. This design is achieved by installing a motor and several connecting shafts on the device tank. The motor is naturally equipped with a motor shaft, so that the motor shaft can be detachably connected to the tank cover. In this way, the motor can drive the tank cover, that is, drive the working rotating tank to rotate, thereby driving the through holes one, two, three, four, five and six on the working rotating tank to rotate. Several connecting shafts are symmetrically distributed with the tank cover as the center, the bottom end of the connecting shaft is connected to the device tank, and the top end is connected to the motor. In this way, the motor can work stably under the support effect of the device tank, so as to stably drive the rotation of the working rotating tank.

[0013] Preferably, the air box 1 is provided with an air hole 1, which is connected to the air box 1, and the air box 2 is provided with an air hole 2, which is connected to the air box 2. In this design, by providing the air hole 1 on the air box 1 and the air hole 1 being connected to the air box 1, the pesticide residue to be detected can be naturally introduced from the air hole 1, and the air box 2 is provided with the air hole 2, which is connected to the air box 2. Here, the air holes 1 and 2 need to be installed with hole plugs. Then, under the control of the hole plugs, the air holes 1 and 2 can be opened and blocked, which will reduce the volatilization of pesticide residues due to the air holes 1 and 2, which not only affects the detection work but also pollutes the outside world.

[0014] Preferably, the through hole one is installed with a vent pipe one, the through hole two is connected to the through hole one through the vent pipe one, the through hole three is installed with a vent pipe two, the opening four is connected to the through hole three through the vent pipe two, the through hole five is installed with a vent pipe three, and the through hole six is connected to the through hole five through the vent pipe three. In this design, by installing a vent pipe one at the through hole one, the through hole two is connected to the through hole one through the vent pipe one, so that the gas flows between the through hole two and the through hole one under the guidance of the vent pipe one. Similarly, the through hole three is installed with a vent pipe two, the opening four is connected to the through hole three through the vent pipe two, and the gas flows between the opening four and the through hole three under the guidance of the vent pipe two. The through hole five is installed with a vent pipe three, the through hole six is connected to the through hole five through the vent pipe three, and the gas flows between the through hole six and the through hole five under the guidance of the vent pipe three.

[0015] Preferably, the exhaust gas treatment box is equipped with an outlet pipe, the opening six is connected to the exhaust gas treatment box via the outlet pipe, and an outlet valve is installed on the outlet pipe. In this design, by installing the outlet pipe on the exhaust gas treatment box and connecting the opening six to the exhaust gas treatment box via the outlet pipe, gas can flow into the exhaust gas treatment box for treatment under the guidance of the outlet pipe. Of course, the outlet pipe is equipped with an outlet valve, which means that the outlet valve can be controlled to control the flow of the outlet pipe.

[0016] The beneficial effects of the utility model are: achieving the purpose of reducing the probability of inaccurate detection due to insufficient sealing; facilitating the rotation control work of the working rotary tank; and installing a gas processing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is a structural diagram of the working rotating tank of the utility model;

[0019] Figure 3 This is a schematic diagram of a working state of the utility model;

[0020] Figure 4 This is another working state schematic diagram of the utility model.

[0021] In the figure: 1. device tank, 2. working rotating tank, 3. chassis, 4. tank cover, 5. motor, 6. connecting shaft, 7. motor shaft, 8. air box one, 9. air hole one, 10. exhaust gas treatment box, 11. outlet pipe, 12. air box two, 13. detector, 14. opening one, 15. opening two, 16. opening three, 17. opening four, 18. opening five, 19. opening six, 20. through hole one, 21. through hole two, 22. vent pipe one, 23. through hole three, 24. through hole four, 25. vent pipe two, 26. through hole five, 27. through hole six, 28. vent pipe three, 29. non-polar chromatographic column, 30. air hole two, 31. polar chromatographic column. DETAILED DESCRIPTION

[0022] The utility model is further described below with reference to the accompanying drawings and specific implementation methods.

[0023] like Figure 1 、 Figure 2 and Figure 3In the embodiment shown, a gas chromatography-based pesticide residue detection device includes a device tank 1 and a working rotating tank 2, the working rotating tank 2 is set in the device tank 1, and the working rotating tank 2 is detachably connected to the device tank 1. The device tank 1 is equipped with a gas box 1 8, a gas box 2 12, a detector 13 and an exhaust gas treatment box 10. The device tank 1 is provided with an opening 14, an opening 2 15, an opening 3 16, an opening 4 17, an opening 5 18 and an opening 6 19. The opening 14, the opening 2 15, the opening 3 16, the opening 4 17, the opening 5 18 and the opening 6 19 are distributed in a ring shape with the center of the device tank 1 as the base point. The gas box 1 8 is connected to the opening 14, and a non-polar chromatographic column 29 is installed at the opening 2 15. One end of the non-polar chromatographic column 29 is connected to the opening 2 15 The other end of the non-polar chromatographic column 29 is connected to the opening three 16, and a polar chromatographic column 31 is installed at the opening four 17. One end of the polar chromatographic column 31 is connected to the opening four 17, and the other end of the polar chromatographic column 31 is connected to the detector 13. The gas box 2 12 is connected to the opening five 18, and the exhaust gas treatment box 10 is connected to the opening six 19. The working rotating tank 2 is provided with a through hole 1 20, a through hole 21, a through hole 3 23, a through hole 4 24, a through hole 5 26 and a through hole 6 27. The through hole 1 20, the through hole 21, the through hole 3 23, the through hole 4 24, the through hole 5 26 and the through hole 6 27 are distributed in a ring shape with the center of the working rotating tank 2 as the base point. The through hole 2 21 is connected to the through hole 1 20, the through hole 4 24 is connected to the through hole 3 23, and the through hole 6 27 is connected to the through hole 5 26.

[0024] like Figure 2 、 Figure 3 and Figure 4As shown, the top of the device tank 1 is provided with a socket, the diameter of which is larger than that of the working rotating tank 2. The bottom of the device tank 1 is mounted with a chassis 3, which is detachably connected to the device tank 1, and the working rotating tank 2 is detachably connected to the chassis 3. The top of the working rotating tank 2 is mounted with a tank cover 4, which is detachably connected to the working rotating tank 2, and the bottom of the working rotating tank 2 is detachably connected to the chassis 3. The device tank 1 is mounted with a motor 5 and several connecting shafts 6. The motor 5 is mounted with a motor shaft 7, which is detachably connected to the tank cover 4. The several connecting shafts 6 are symmetrically distributed around the tank cover 4. The bottom ends of the connecting shafts 6 are connected to the device tank 1, and the top ends of the connecting shafts 6 are connected to the motor 5. Air box 1 8 is provided with an air hole 1 9, which is connected to air box 1 8. Air box 2 12 is provided with an air hole 2 30, which is connected to air box 2 12. A vent pipe 22 is installed at through hole 1 20. Through hole 2 21 is connected to through hole 1 20 via vent pipe 1 22. A vent pipe 25 is installed at through hole 3 23. Opening 17 is connected to through hole 3 23 via vent pipe 25. A vent pipe 3 28 is installed at through hole 5 26. Through hole 6 27 is connected to through hole 5 26 via vent pipe 3 28. An outlet pipe 11 is installed on exhaust gas treatment box 10. Opening 19 is connected to exhaust gas treatment box 10 via outlet pipe 11. An outlet valve is installed on outlet pipe 11.

[0025] First, the pesticide residue detection device needs to be installed. This detection device includes a device tank 1 and a working rotating tank 2. A socket is provided at the top of the device tank 1, and a chassis 3 is installed at the bottom. The diameter of the socket is larger than the diameter of the working rotating tank 2, so the working rotating tank 2 can be controlled to be inserted from the socket until the bottom of the working rotating tank 2 touches the chassis 3. Then, the working rotating tank 2 is supported by the chassis 3. The size of the working rotating tank 2 here can match the size of the socket. Because the cross-sectional shape of the working rotating tank 2 structure is generally cylindrical, in order to reduce gas leakage during circulation, the diameter of the socket can be equal to the diameter of the outer wall of the working rotating tank 2, that is, the outer wall of the working rotating tank 2 can be close to the inner wall of the device tank 1 first. A rolling bearing can be installed on the chassis 3. The lower end of the rolling bearing is sealed by the chassis 3, and the outer ring is connected to the chassis 3. The bottom end of the working rotating tank 2 can be placed on the inner ring. In this way, the rotation of the working rotating tank 2 can be carried out stably under the support effect of the chassis 3.

[0026] Then it is necessary to install the motor 5. The tank cover 4 at the top of the working rotating tank 2 can be connected to the working rotating tank 2 through a threaded connection, and a thread groove needs to be set on the tank cover 4, and the motor shaft 7 on the motor 5 also needs to be provided with a thread. This thread matches the thread groove, so that the connection work between the motor shaft 7 and the tank cover 4 can be done under the threaded connection effect. Not only that, several connecting shafts 6 are symmetrically distributed with the tank cover 4 as the center, that is, several connecting shafts 6 are installed on the top of the device tank 1, so it is necessary to set several matching slots on the motor 5, so that the connecting shafts 6 are inserted into the slots one by one, so that the motor 5 is supported and limited by the device tank 1 through the connecting shafts 6. It is worth noting that this motor 5 needs to be electrically connected to the external power supply through the switch assembly, so that the motor 5 can smoothly start and close the work.

[0027] Then, the pesticide residue to be tested is put into the gas box 8 through the air hole 9. After putting it in, the hole plug needs to be controlled in time to close the air hole 9 so that the gas can smoothly pass through the opening 14, the through hole 20, the vent pipe 22, the through hole 21 and the opening 2 15 in turn and then be introduced into the non-polar chromatographic column 29. The non-polar chromatographic column 29 is used for the first separation of agricultural residues. Under the guiding effect of the non-polar chromatographic column 29, the gas passes through the opening 3 16, the through hole 3 23, the vent pipe 25, the through hole 4 24 and the opening 4 17 in turn and then enters the polar chromatographic column 31. Then the polar chromatographic column 31 is used for the first separation of agricultural residues. The chromatographic column 31 is used to separate the agricultural residues again. Finally, the gas will be smoothly introduced into the detector 13 for detection. This detector 13 can be a hydrogen flame detector. The low-boiling-point pesticide residues have a relatively short retention time on the non-polar chromatographic column 29, but a significantly increased retention time on the polar chromatographic column 31, which is much higher than that of alkanes with the same carbon number. Therefore, the pesticide residues are first separated into the mixed components of the residues to be detected by a non-polar chromatographic column 29, and then quantitatively analyzed on the polar chromatographic column 31, and the other components in the non-polar chromatographic column 29 are vented. In order to exclude the interference of the same carbon number or high carbon number alkane components on the chromatographic analysis results of the residue, of course, after the gas is detected, it is necessary to carry out gas processing work, so it is necessary to control the switch component to make the rotation of the motor shaft drive the rotation of the working rotating tank 2, and the through hole 1 20, through hole 2 21, through hole 3 23, through hole 4 24, through hole 5 26 and through hole 6 27 on the working rotating tank 2 are driven to rotate until the through hole 21 is aligned with the opening 14, the through hole 1 20 is aligned with the opening 3 16, the through hole 3 23 is aligned with the opening 4 17, and the through hole 4 24 is aligned with the opening 5 18 , and the through hole five 26 is aligned with the opening six 19, and the through hole six 27 is aligned with the opening two 15, so that the gas can pass through the opening four 17, the through hole three 23, the vent pipe two 25, the through hole four 24 and the opening five 18 in sequence and enter the air box two 12. When the working rotary tank 2 is rotated again, that is, when the through hole five 26 is aligned with the opening five 18, the through hole six 27 is aligned with the opening six 19, the gas will pass through the opening five 18, the through hole five 26, the vent pipe three 28, the through hole six 27, the opening six 19 and the outlet pipe 11 in sequence and enter the exhaust gas treatment box 10, thereby avoiding the leakage of gas and affecting the outside world.

[0028] The gas flow guidance work here is to make the motor shaft on the motor drive the working rotating tank 2 to rotate under the control of the switch component, that is, to drive the rotation of through hole 1 20, through hole 2 21, through hole 3 23, through hole 4 24, through hole 5 26 and through hole 6 27 on the working rotating tank 2. This eliminates the need for multiple interval operations of the valve and avoids the impact of the valve sealing on the detection effect. In this way, the purpose of reducing the probability of inaccurate detection due to insufficient sealing is achieved. Of course, in order to achieve better sealing, a rotating groove can also be set on the inner wall of the device tank 1. The outer wall of the working rotating tank 2 is embedded in the rotating groove, which further reduces the probability of gas leakage.

Claims

1. A gas chromatography-based pesticide residue detection device, characterized in that: The invention comprises a device tank (1) and a working rotating tank (2), wherein the working rotating tank (2) is mounted in the device tank (1), and the working rotating tank (2) is detachably connected to the device tank (1). The device tank (1) is provided with an air box (8), an air box (12), a detector (13) and an exhaust gas treatment box (10). The device tank (1) is provided with an opening (14), an opening (15), an opening (16), an opening (17), an opening (18) and an opening (19). The opening (14), opening (15), opening (16), opening (17), opening (18) and opening (19) are arranged in a ring shape with the center of the device tank (1) as the base point. The gas box (8) is connected to the opening (14). A non-polar chromatographic column (29) is installed at the opening (15). One end of the non-polar chromatographic column (29) is connected to the opening (15). The other end of the non-polar chromatographic column (29) is connected to the opening (15). The end is connected to the opening three (16), the opening four (17) is provided with a polar chromatographic column (31), one end of the polar chromatographic column (31) is connected to the opening four (17), the other end of the polar chromatographic column (31) is connected to the detector (13), the gas box two (12) is connected to the opening five (18), the tail gas treatment box (10) is connected to the opening six (19), the working rotating tank (2) is provided with a through hole one (20), a through hole two (21), a through hole Through hole 1 (20), through hole 2 (21), through hole 3 (23), through hole 4 (24), through hole 5 (26) and through hole 6 (27), the through hole 1 (20), through hole 2 (21), through hole 3 (23), through hole 4 (24), through hole 5 (26) and through hole 6 (27) are distributed in a ring shape with the center of the working rotating tank (2) as the base point, the through hole 2 (21) is connected to the through hole 1 (20), the through hole 4 (24) is connected to the through hole 3 (23), and the through hole 6 (27) is connected to the through hole 5 (26).

2. The gas chromatography-based pesticide residue detection device according to claim 1, characterized in that: The top end of the device tank (1) is provided with a socket, the diameter of the socket being larger than the diameter of the working rotating tank (2), and the bottom end of the device tank (1) is provided with a chassis (3), the chassis (3) being detachably connected to the device tank (1), and the working rotating tank (2) being detachably connected to the chassis (3).

3. The gas chromatography-based pesticide residue detection device according to claim 2, characterized in that: A tank cover (4) is installed at the top end of the working rotary tank (2), and the tank cover (4) is detachably connected to the working rotary tank (2). The bottom end of the working rotary tank (2) is detachably connected to the chassis (3).

4. The gas chromatography-based pesticide residue detection device according to claim 3, characterized in that: The device tank (1) is equipped with a motor (5) and a plurality of connecting shafts (6). The motor (5) is equipped with a motor shaft (7). The motor shaft (7) is detachably connected to the tank cover (4). The plurality of connecting shafts (6) are symmetrically distributed with the tank cover (4) as the center. The bottom ends of the connecting shafts (6) are connected to the device tank (1), and the top ends of the connecting shafts (6) are connected to the motor (5).

5. The gas chromatography-based pesticide residue detection device according to claim 1, characterized in that: The air box one (8) is provided with an air hole one (9), and the air hole one (9) is connected to the air box one (8). The air box two (12) is provided with an air hole two (30), and the air hole two (30) is connected to the air box two (12).

6. The gas chromatography-based pesticide residue detection device according to claim 1, characterized in that: The through hole one (20) is provided with a vent pipe one (22), the through hole two (21) is connected to the through hole one (20) via the vent pipe one (22), the through hole three (23) is provided with a vent pipe two (25), the opening four (17) is connected to the through hole three (23) via the vent pipe two (25), the through hole five (26) is provided with a vent pipe three (28), and the through hole six (27) is connected to the through hole five (26) via the vent pipe three (28).

7. The gas chromatography-based pesticide residue detection device according to claim 1, characterized in that: An air outlet pipe (11) is installed on the exhaust gas treatment box (10), the opening six (19) is connected to the exhaust gas treatment box (10) through the air outlet pipe (11), and an air outlet valve is installed on the air outlet pipe (11).

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