Pesticide residue detection equipment and pesticide residue detection method

Abstract

The invention provides pesticide residue detection equipment and a pesticide residue detection method, and relates to the technical field of spectrum detection.The detection equipment comprises a gas chromatograph, a sampling mechanism and a concentration mechanism, a display screen is installed at the top of the gas chromatograph, a feeding opening is formed in one side of the sampling mechanism and used for conveying a to-be-detected product and a dissolving solution, and the concentration mechanism is connected with the display screen; an extrusion assembly is screwed above the inner side of the sampling mechanism, a stirring shaft is inserted into the bottom of the inner side of the sampling mechanism, a crushing rod is inserted into the side edge of the stirring shaft, and a concentration mechanism is mounted at the bottom of the sampling mechanism. After a to-be-detected product is put in, the pretreatment process of the sample is quickly and efficiently completed, the efficiency of the whole detection process is improved, the sample does not need to be transferred for multiple times, and the probability that the sample is polluted by external factors is reduced. The processes of injection, crushing, mixing and filtering can be quickly completed, and meanwhile, the problem that a large amount of concentrated liquid is adhered and cannot be utilized is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of spectrum detection, and in particular to a pesticide residue detection device and a pesticide residue detection method. Background Art

[0002] Gas chromatography-mass spectrometry (GC-MS) is a highly effective technique for detecting pesticide residues. The principle is as follows: Gas chromatography (GC) is used to separate the complex components in a sample. A carrier gas propels the vaporized sample through the chromatographic column, separating the different pesticides based on their volatility. Mass spectrometry (MS) is then used for precise identification, ionizing the separated components into fragments. Characteristic ion spectra are generated based on the mass-to-charge ratio. These spectra are then compared with a database to confirm the pesticide type and quantify the residue. This highly sensitive method is suitable for food safety testing of fruits, vegetables, grains, and other products, combining separation capabilities with high accuracy.

[0003] Gas chromatography-mass spectrometry is often used to detect pesticide residues in existing technologies. However, this process requires sample pretreatment. Conventional processing schemes are divided into multiple steps, including crushing the product to be tested, stirring and mixing the solution, and filtering. This results in cumbersome operation steps and low efficiency. On the other hand, conventional gas chromatography monitoring equipment is also very prone to adhesion of concentrated samples, resulting in a small amount of usable sample. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a pesticide residue detection device and a pesticide residue detection method to solve the problems raised in the above background technology. The present invention improves the detection efficiency, can quickly complete the pretreatment of the sample, can accelerate the concentration process of the sample, and improve the sample output rate.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a pesticide residue detection device, including a detection device body, the device body including a gas chromatograph, a sampling mechanism and a concentrating mechanism, the top of the gas chromatograph is equipped with a display screen, and a feeding port is provided on one side of the sampling mechanism, and the feeding port is used to transport the product to be tested and the dissolved liquid, an extrusion component is screwed on the upper inner side of the sampling mechanism, and a stirring shaft is inserted into the inner bottom of the sampling mechanism, and a breaking rod is inserted into the side of the stirring shaft, a concentrating mechanism is installed at the bottom of the sampling mechanism, the end of the concentrating mechanism is integrated with a sample delivery channel, and the bottom of the sample delivery channel is integrated with a detection pipeline, the end of the detection pipeline is connected to the interior of the gas chromatograph, the end of the concentrating mechanism is welded with a support frame, the top of the support frame is movably connected to the surface of the sampling mechanism through a bearing, and the rear end of the concentrating mechanism and the end of the stirring shaft are screwed with independent motors.

[0006] Furthermore, the sampling mechanism includes a sampling tank, an extrusion assembly and a filter membrane. The bottom of the sampling tank is a semicircular structure, and an interlayer is provided on the inner side of the circular shell at the bottom of the sampling tank. The filter membrane is interspersed inside the interlayer, and a top layer docking port is opened at the bottom of the sampling tank.

[0007] Furthermore, a winding shaft is installed at both ends of the filter membrane, and a rubbing wheel is installed at the end of the winding shaft. The filter membrane passes through the inside of the top-layer docking interface, and a screen is laid on the inner side of the top-layer docking interface. The stirring shaft is used to drive the breaking rod to rotate.

[0008] Furthermore, the extrusion assembly includes an electric lifting rod, an extrusion plate and a shear plate. The top end of the electric lifting rod is screwed to the inner wall of the sampling tank, and the bottom end of the electric lifting rod is screwed to the extrusion plate. The side of the extrusion plate is set to an arc structure.

[0009] Furthermore, a partition is inserted in the middle of the sampling tank, one side of the extrusion plate is fitted with the surface of the partition through a vertical plate, and a shear plate is integrally formed at the bottom end of the partition.

[0010] Furthermore, a plurality of plug-in slots are provided on the surface of the shear plate, and each of the breaking rods passes through the inside of the plug-in slot after rotation, and the thickness of the breaking rod is the same as that of the shear plate. The extrusion plate is extended and moved downward by the electric lifting rod and fits with the bottom end of the inner wall of the sampling tank.

[0011] Furthermore, the concentrating mechanism includes a docking plate and a limiting support plate, the limiting support plate is integrally formed at one end of the docking plate, a bottom docking port is provided in the middle of the docking plate, a concentrating tank is integrally formed at the bottom of the docking plate, and a screw rod is inserted into the interior of the concentrating tank.

[0012] Furthermore, one end of the screw rod is inserted into the output end of one of the motors, a push plate is provided on the surface of the screw rod, a threaded sleeve is provided in the middle of the push plate, and the threaded sleeve is provided on the screw rod, and a first end plate and a second end plate are respectively provided at both ends of the inner wall of the concentration tank, and a diversion pipe is connected between the first end plate and the second end plate.

[0013] Furthermore, an air jet hole is provided on the surface of the diversion pipe, a connecting sleeve is provided on the outer side of the second end plate, the end of the concentrating mechanism is connected to an air supply pipe, and the air supply pipe is embedded in the interior of the connecting sleeve. The interior of the second end plate is a hollow structure, and the second end plate is connected to the interior of each diversion pipe, and each diversion pipe passes through the surface of the push plate.

[0014] A method for detecting pesticide residues using the above-mentioned detection device comprises the following steps:

[0015] S1. Prepare the sample to be tested and place it in the sampling mechanism;

[0016] S2, injecting the dissolving solution, crushing the sample, and mixing it with the dissolving solution;

[0017] S3, filtering to remove impurities such as pulp and fiber, leaving only the liquid containing pesticides;

[0018] S4. Start the concentration mechanism, inject nitrogen, evaporate the solvent, and concentrate the sample;

[0019] S5. The concentrated sample is transported to a gas chromatograph, heated to generate gas, and transported to a chromatographic column;

[0020] S6. Identify pesticide types and content data, and generate chromatograms and mass spectra.

[0021] Beneficial effects of the present invention:

[0022] 1. This pesticide residue detection method can quickly and efficiently complete the sample pretreatment process after the product to be tested is placed, thereby improving the efficiency of the entire detection process, eliminating the need for multiple sample transfers, and reducing the probability of sample contamination by external factors.

[0023] 2. The pesticide residue detection equipment injects the sample to be tested and the dissolving solution into the interior of the sampling mechanism at the same time, and can simultaneously perform crushing and mixing. During this process, the rotation effect of the sampling mechanism can also be used to prevent the generated solution from flowing directly to the bottom. After the mixing is completed, the internal extrusion component is cooperated to quickly filter and separate, thereby quickly completing the injection, crushing, mixing and filtration processes without transferring the sample.

[0024] 3. In the concentration mechanism at the bottom of the pesticide residue detection equipment, nitrogen is injected into the inner side of the concentration tank and blown into the bottom and top of the solution at the same time to accelerate the volatilization of the solvent and improve the concentration efficiency. At the same time, the inner push plate can scrape the inner wall of the concentration tank and the surface of the diversion pipe to avoid the problem of a large amount of concentrated liquid sticking and being unusable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the appearance of a pesticide residue detection device of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the sampling mechanism part of the present invention;

[0027] Figure 3 is an internal cross-sectional view of the sampling mechanism of the present invention;

[0028] Figure 4It is a structural schematic diagram of the extrusion component part of the present invention;

[0029] Figure 5 This is an end structural diagram of the concentrating mechanism of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the concentration mechanism part of the present invention;

[0031] Figure 7 This is a schematic diagram of the connection of the push plate portion inside the concentrating mechanism of the present invention;

[0032] Figure 8 This is a flow chart of a method for detecting pesticide residues of the present invention;

[0033] In the figure: 1. Gas chromatograph; 2. Display screen; 3. Sampling mechanism; 4. Concentration mechanism; 5. Feeding port; 6. Rubbing wheel; 7. Extrusion assembly; 8. Sampling tank; 9. Rewinding shaft; 10. Filter membrane; 11. Top docking port; 12. Screen; 13. Stirring shaft; 14. Crushing rod; 15. Electric lifting rod; 16. Partition; 17. Extrusion plate; 18. Shear plate; 19. Connecting slot; 20. Docking plate; 21. Limiting support plate; 22. Concentration tank; 23. Push plate; 24. Bottom docking port; 25. Motor; 26. Support frame; 27. Sample delivery channel; 28. Detection pipeline; 29. First end plate; 30. Screw; 31. Diversion pipeline; 32. Jet hole; 33. Threaded sleeve; 34. Second end plate; 35. Connecting sleeve; 36. Air delivery pipeline. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] See also Figures 1 to 8The present invention provides the following technical solution: a pesticide residue detection device, comprising a detection device body, the device body comprising a gas chromatograph 1, a sampling mechanism 3 and a concentrating mechanism 4, a display screen 2 being installed on the top of the gas chromatograph 1, a feeding port 5 being provided on one side of the sampling mechanism 3, the feeding port 5 being used to deliver the product to be tested and the dissolved liquid, an extrusion component 7 being screwed on the upper inner side of the sampling mechanism 3, and a stirring shaft 13 being inserted into the inner bottom of the sampling mechanism 3, a breaking rod 14 being inserted into the side of the stirring shaft 13, a concentrating mechanism 4 being installed at the bottom of the sampling mechanism 3, a sample delivery channel 27 being integrally formed at the end of the concentrating mechanism 4, a detection pipe 28 being integrally formed at the bottom of the sample delivery channel 27, the end of the detection pipe 28 being connected to the interior of the gas chromatograph 1, a support frame 26 being welded to the end of the concentrating mechanism 4, the top of the support frame 26 being movably connected to the surface of the sampling mechanism 3 through a bearing, and an independent motor 25 being screwed to the rear end of the concentrating mechanism 4 and the end of the stirring shaft 13. The testing equipment uses gas chromatography-mass spectrometry to detect pesticide residues on the products to be tested.

[0036] When the present invention is used, the sample to be tested is prepared, the cover at the delivery port 5 is opened, and the sample is delivered to the sampling mechanism 3; the dissolving liquid is injected, and the dissolving liquid in this embodiment includes a mixed solution of acetone and acetonitrile, and then the cover at the delivery port 5 is closed and sealed, and the motor 25 structure at the rear end of the sampling mechanism 3 is started to drive the crushing rod 14 to rotate, crush the sample, and mix it with the dissolving liquid during the crushing process; the extrusion component 7 is started, and the crushed and mixed sample is filtered by moving the extrusion component 7 downward to remove impurities such as pulp and fiber, leaving only the liquid containing pesticides, and this part of the liquid directly flows into the concentrating mechanism 4 at the bottom; the concentrating mechanism 4 is started, and nitrogen is injected to volatilize the solvent by nitrogen to concentrate the sample, and the concentrated liquid is transported toward the sample delivery channel 27 at one end with the help of the push plate 23; the concentrated sample is transported to the gas chromatograph 1, heated to generate gas, and transported to the chromatographic column.

[0037] In this embodiment, the sampling mechanism 3 includes a sampling tank 8, an extrusion assembly 7, and a filter membrane 10. The bottom of the sampling tank 8 is a semicircular structure, and an interlayer is provided inside the circular shell at the bottom of the sampling tank 8. The filter membrane 10 is inserted into the inner part of the interlayer. The bottom of the sampling tank 8 is provided with a top-layer docking port 11. The two ends of the filter membrane 10 are inserted with a reel 9, and the end of the reel 9 is inserted with a rubbing wheel 6. The filter membrane 10 passes through the inside of the top-layer docking port 11. The inner side of the top-layer docking port 11 is paved with a screen 12. The stirring shaft 13 is used to drive the breaker rod 14 to rotate.

[0038] Specifically, after the sample and the dissolved liquid are put into the interior of the sampling tank 8, the sampling tank 8 is manually controlled to rotate slightly until it is in contact with the surface of the limit support plate 21. At this time, the top docking interface 11 and the bottom docking interface 24 are staggered, so the solution inside will not directly enter the concentrating mechanism 4 at the bottom in this state. After starting the motor 25 at the rear end of the sampling tank 8, the stirring shaft 13 is driven to rotate by the rotation of the motor 25, and each crushing rod 14 is controlled to rotate. During the rotation of the crushing rod 14, the dissolved liquid and the sample injected into the interior are crushed. This process will also be carried out by the crushing rod 14 passing through the plug-in slot 19 in the top shear plate 18, thereby realizing the shearing process of the sample to be tested.

[0039] In this embodiment, the extrusion assembly 7 includes an electric lifting rod 15, an extrusion plate 17, and a shear plate 18. The top end of the electric lifting rod 15 is screwed onto the inner wall of the sampling tank 8, and the bottom end of the electric lifting rod 15 is screwed onto the extrusion plate 17. The side of the extrusion plate 17 is configured as an arc-shaped structure. A partition 16 is inserted in the middle of the sampling tank 8. One side of the extrusion plate 17 is fitted with the surface of the partition 16 through a vertical plate. The bottom end of the partition 16 is integrally formed with a shear plate 18. The surface of the shear plate 18 is provided with a plurality of plug-in slots 19. Each of the breaker rods 14 passes through the inside of the plug-in slot 19 after rotation, and the thickness of the breaker rod 14 is the same as that of the shear plate 18. The extrusion plate 17 is fitted with the bottom end of the inner wall of the sampling tank 8 after being extended and moved downward by the electric lifting rod 15. At the same time, the sample to be tested and the dissolving liquid are injected into the interior of the sampling mechanism 3, and the crushing and mixing processes can be carried out at the same time. In this process, the rotation effect of the sampling mechanism 3 can also be used to prevent the generated solution from flowing directly to the bottom. After the mixing is completed, the inner extrusion component 7 is cooperated to quickly perform filtration and separation, thereby quickly completing the injection, crushing, mixing and filtration processes without transferring the sample.

[0040] Specifically, after the mixing and crushing is completed, the sampling tank 8 is manually controlled to rotate until the top docking port 11 and the bottom docking port 24 are aligned, and then the motor 25 behind the sampling tank 8 is controlled to drive the stirring shaft 13 to continue to rotate, and each crushing rod 14 is controlled to be embedded in the inside of the plug-in slot 19, so that the shear plate 18 forms a complete plate structure. At this time, the electric lifting rod 15 on the top is started, and the downward movement of the electric lifting rod 15 drives the extrusion plate 17 at the bottom to move. The extrusion plate 17 pushes the mixed sample downward toward the bottom end, and finally squeezes the mixed sample, and the extruded solution passes through the screen 12 in the top docking port 11, and the filter membrane 10 part, and finally flows into the concentration mechanism 4 at the bottom. Each time the sampling mechanism 3 is used, the rubbing wheel 6 is directly controlled to rotate from the outside to switch and update the filter membrane 10 part.

[0041] In this embodiment, the concentrating mechanism 4 includes a docking plate 20 and a limiting support plate 21. The limiting support plate 21 is integrally formed at one end of the docking plate 20. A bottom docking port 24 is defined in the center of the docking plate 20. A concentrating tank 22 is integrally formed at the bottom of the docking plate 20, and a screw rod 30 is inserted into the interior of the concentrating tank 22. One end of the screw rod 30 is inserted into the output end of one of the motors 25. A push plate 23 is sleeved on the surface of the screw rod 30. A threaded sleeve 33 is defined in the center of the push plate 23 and is sleeved onto the screw rod 30. A first end plate 29 and a second end plate 34 are respectively provided at each end of the inner wall of the concentrating tank 22. A diversion pipe 31 is connected between the first end plate 29 and the second end plate 34. The surface of the diverter pipe 31 is provided with an air jet hole 32, and a connecting sleeve 35 is provided on the outer side of the second end plate 34. An air supply pipe 36 is connected to the end of the concentrating mechanism 4 and is embedded within the connecting sleeve 35. The interior of the second end plate 34 is hollow and communicates with the interior of each diverter pipe 31, each of which passes through the surface of the push plate 23. In the bottom concentrating mechanism 4, nitrogen is injected into the interior of the concentrating tank 22 and blown simultaneously at the bottom and top of the solution to accelerate solvent volatilization and improve concentration efficiency. Simultaneously, the inner push plate 23 scrapes the inner wall of the concentrating tank 22 and the surface of the diverter pipe 31, preventing the concentrated liquid from sticking and becoming unusable.

[0042] Specifically, nitrogen is transported along the air delivery pipe 36 to the inside of the connecting sleeve 35 through an external air pump and is evenly transported toward the inside of each branch pipe 31 in the second end plate 34. Finally, the solvent in the solution is accelerated to evaporate through each air jet hole 32, so that the sample solution containing pesticides is concentrated. Then, the motor 25 at the rear end of the concentration mechanism 4 is started, and the motor 25 drives the screw rod 30 to rotate. The screw rod 30 cooperates with the threaded sleeve 33 on the push plate 23 to move the entire push plate 23 translationally along the screw rod 30. With the help of the push plate 23, the surface of the branch pipe 31 and the inner wall of the concentration tank 22 are scraped to achieve the purpose of concentrating the concentrated liquid adhering to the inner wall, and finally all the concentrated liquid is pushed into the interior of the sample delivery channel 27 and enters the gas chromatograph 1 through the detection pipe 28 at the bottom.

[0043] This embodiment also provides a method for detecting pesticide residues using the above-mentioned detection device, comprising the following steps:

[0044] S1. Prepare the sample to be tested, open the cover at the injection port 5, and put it into the sampling mechanism 3;

[0045] S2. Inject the dissolving solution, which in this embodiment includes a mixed solution of acetone and acetonitrile. Then, close the cover plate at the injection port 5 and seal it. Start the motor 25 at the rear end of the sampling mechanism 3 to drive the crushing rod 14 to rotate, crushing the sample and mixing it with the dissolving solution during the crushing process.

[0046] S3, start the extrusion assembly 7, and filter the crushed and mixed sample by moving the extrusion assembly 7 downward to remove impurities such as pulp and fiber, leaving only the liquid containing the pesticide, and this part of the liquid directly flows into the concentration mechanism 4 at the bottom;

[0047] S4, start the concentration mechanism 4, inject nitrogen gas, volatilize the solvent by the nitrogen gas, concentrate the sample, and use the push plate 23 to transport the concentrated liquid toward the sample delivery channel 27 at one end;

[0048] S5. The concentrated sample is transported to a gas chromatograph 1, where it is heated to generate gas, which is then transported to a chromatographic column. Different pesticides migrate within the column: lighter ones migrate faster and exit the column first, while heavier ones migrate slower and exit the column later, achieving separation. The pesticide molecules exiting the column are bombarded by electrons, breaking into charged small pieces. The computer compares the fragment composition with a database to confirm the pesticide type.

[0049] S6. Identify the pesticide type and content data, generate chromatograms and mass spectra, where the chromatograms show the peak times of different pesticides, and the mass spectra show the fragmentation characteristics. Calculate the pesticide residue based on the peak area or peak height.

[0050] This method can quickly and efficiently complete the sample pretreatment process after the product to be tested is placed, thereby improving the efficiency of the entire detection process, eliminating the need for multiple sample transfers, and reducing the probability of sample contamination by external factors.

[0051] The basic principles, main features and advantages of the present invention are shown and described above. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0052] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A pesticide residue detection device, comprising a detection device body, characterized in that: The device body comprises a gas chromatograph (1), a sampling mechanism (3) and a concentration mechanism (4); a display screen (2) is installed on the top of the gas chromatograph (1); a feeding port (5) is provided on one side of the sampling mechanism (3); the feeding port (5) is used to transport the product to be tested and the dissolving liquid; an extrusion assembly (7) is screwed on the upper inner side of the sampling mechanism (3); a stirring shaft (13) is inserted at the bottom inner side of the sampling mechanism (3); a crushing rod (14) is inserted at the side of the stirring shaft (13); and a bottom of the sampling mechanism (3) is installed. A concentrating mechanism (4) is provided, wherein a sample delivery channel (27) is integrally formed at the end of the concentrating mechanism (4), a detection pipeline (28) is integrally formed at the bottom of the sample delivery channel (27), and the end of the detection pipeline (28) is connected to the interior of the gas chromatograph (1). A support frame (26) is welded to the end of the concentrating mechanism (4), and the top of the support frame (26) is movably connected to the surface of the sampling mechanism (3) through a bearing. The rear end of the concentrating mechanism (4) and the end of the stirring shaft (13) are both screwed with an independent motor (25).

2. A pesticide residue detection device according to claim 1, characterized in that: The sampling mechanism (3) comprises a sampling tank (8), an extrusion assembly (7) and a filter membrane (10); the bottom of the sampling tank (8) is a semicircular structure, and an interlayer is provided inside the circular shell at the bottom of the sampling tank (8); the filter membrane (10) is inserted into the interlayer; and a top-layer docking port (11) is provided at the bottom of the sampling tank (8).

3. A pesticide residue detection device according to claim 2, characterized in that: The two ends of the filter membrane (10) are inserted with a reeling shaft (9), and the end of the reeling shaft (9) is inserted with a rubbing wheel (6). The filter membrane (10) passes through the inside of the top-layer docking port (11), and the inner side of the top-layer docking port (11) is paved with a screen (12). The stirring shaft (13) is used to drive the crushing rod (14) to rotate.

4. The pesticide residue detection device according to claim 2, characterized in that: The extrusion assembly (7) comprises an electric lifting rod (15), an extrusion plate (17) and a shear plate (18), wherein the top end of the electric lifting rod (15) is screwed onto the inner wall of the sampling tank (8), and the bottom end of the electric lifting rod (15) is screwed onto the extrusion plate (17), and the side of the extrusion plate (17) is arranged as an arc structure.

5. The pesticide residue detection device according to claim 4, characterized in that: A partition (16) is inserted in the middle of the sampling tank (8), one side of the extrusion plate (17) is fitted with the surface of the partition (16) through a vertical plate, and a shear plate (18) is integrally formed at the bottom end of the partition (16).

6. The pesticide residue detection device according to claim 5, characterized in that: The surface of the shear plate (18) is provided with a plurality of plug-in slots (19), and each of the crushing rods (14) passes through the inside of the plug-in slot (19) after being rotated, and the thickness of the crushing rod (14) is the same as that of the shear plate (18). The extrusion plate (17) is extended and moved downward by the electric lifting rod (15) to fit with the bottom end of the inner wall of the sampling tank (8).

7. The pesticide residue detection device according to claim 4, characterized in that: The concentrating mechanism (4) comprises a docking plate (20) and a limiting support plate (21), wherein the limiting support plate (21) is integrally formed at one end of the docking plate (20), a bottom docking port (24) is provided in the middle of the docking plate (20), a concentrating tank (22) is integrally formed at the bottom of the docking plate (20), and a screw rod (30) is inserted into the interior of the concentrating tank (22).

8. The pesticide residue detection device according to claim 7, characterized in that: One end of the screw rod (30) is inserted into the output end of one of the motors (25); a push plate (23) is sleeved on the surface of the screw rod (30); a threaded sleeve (33) is provided in the middle of the push plate (23), and the threaded sleeve (33) is sleeved on the screw rod (30); a first end plate (29) and a second end plate (34) are respectively provided at both ends of the inner wall of the concentration tank (22); and a diversion pipe (31) is connected between the first end plate (29) and the second end plate (34).

9. The pesticide residue detection device according to claim 8, characterized in that: The surface of the diversion pipe (31) is provided with an air injection hole (32), the outer side of the second end plate (34) is provided with a connecting sleeve (35), the end of the concentrating mechanism (4) is connected to an air supply pipe (36), and the air supply pipe (36) is embedded in the interior of the connecting sleeve (35). The interior of the second end plate (34) is a hollow structure, and the second end plate (34) is connected to the interior of each diversion pipe (31), and each diversion pipe (31) passes through the surface of the push plate (23).

10. A method for detecting pesticide residues using the detection device according to claim 1, characterized in that: The following steps are involved: S1. Prepare the sample to be tested and place it in the sampling mechanism; S2, injecting the dissolving solution, crushing the sample, and mixing it with the dissolving solution; S3, filtering to remove impurities such as pulp and fiber, leaving only the liquid containing pesticides; S4. Start the concentration mechanism, inject nitrogen, evaporate the solvent, and concentrate the sample; S5. The concentrated sample is transported to a gas chromatograph, heated to generate gas, and transported to a chromatographic column; S6. Identify pesticide types and content data, and generate chromatograms and mass spectra.

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