Grain and oil food pesticide residue detection equipment

Abstract

The utility model belongs to the technical field of pesticide residue detection equipment, particularly relates to grain and oil food pesticide residue detection equipment, and provides the following scheme aiming at the problems of low extraction efficiency and tedious steps of the existing pesticide residue detection equipment: the grain and oil food pesticide residue detection equipment comprises a distillation tank, a condensation flow guide assembly, a pesticide residue enrichment assembly and a flow division detection assembly, superheated steam is formed through coordinated heating of the steam generator and the electric heating wire net, high-boiling-point pesticide residues are effectively extracted, the arranged pesticide residue enrichment assembly selectively adsorbs and enriches the pesticide residues in condensate through solid-phase extraction adsorption filler, and the detection sensitivity is greatly improved; the split-flow detection assembly realizes split-flow of waste liquid and eluent through a liquid outlet three-way valve, and finally, the concentrated eluent is accurately dropwise added to detection test paper through a liquid dropping nozzle, so that totally-closed operation from sample treatment to detection result is realized, manual operation errors and environmental pollution risks are reduced, and the device is particularly suitable for on-site rapid detection scenes.

Description

Technical Field

[0001] This utility model relates to a pesticide residue detection device, specifically a pesticide residue detection device for grain and oil foods, and belongs to the technical field of pesticide residue detection devices. Background Technology

[0002] Pesticide residue detection is a crucial step in ensuring the safety of grain and oil products. While existing technologies are diverse, they still have significant limitations. On the one hand, traditional detection methods, such as chromatography-mass spectrometry (GC-MS), while highly accurate, involve expensive equipment, complex operation, and lengthy processing times. Pretreatment requires cumbersome extraction, purification, and concentration steps, making it difficult to meet the needs of rapid on-site detection. On the other hand, rapid screening technologies, such as enzyme inhibition methods (rapid test card methods), while simple to operate, are easily affected by sample matrix interference, have low sensitivity, and can only detect organophosphorus and carbamate pesticides, failing to cover multiple pesticide residues. Particularly in the field of equipment using distillation for pretreatment, existing technologies still suffer from problems such as limited functionality, low integration, and low efficiency.

[0003] In existing technologies, such as the rotary evaporator for solvent redistillation in pesticide residue detection of agricultural products disclosed in CN210845329U, the distillation flask is heated in a water bath using a heating pan, and heating fins are used to improve the uniformity of heating of the liquid inside the flask. Although this design optimizes heating efficiency, its function is limited to the redistillation purification of the solvent and does not involve a series of processes such as distillation extraction, condensation collection, and subsequent detection of pesticide residues in solid agricultural product samples, thus failing to meet the needs of rapid detection of pesticide residues in grain and oil products. Another example is the agricultural product detection system and method disclosed in CN108663362A, which uses a steam generator, a steam liquefaction and collection device, an agricultural product stirring and sampling device, a test liquid temporary storage and dripping device, and a distilled water temporary storage and dripping device. This system can extract and detect pesticide residues on the surface of agricultural products using the principle of steam distillation, achieving the goal of rapid detection to a certain extent. However, the integration of the steam distillation process and subsequent detection steps in this system is still not high, and it does not include the crucial step of online enrichment and concentration of the distilled pesticide residues, which is essential for improving detection sensitivity. Meanwhile, the device still has room for improvement in areas such as uniform steam penetration into the sample, condensation efficiency, and leak prevention for powdered samples. Furthermore, existing technologies, such as the novel food testing distillation apparatus disclosed in CN209968443U, primarily improve temperature control and sealing during distillation, but also fail to address the integration of distillation, enrichment, and detection. In summary, existing distillation devices often focus on a single link in the process chain, failing to effectively form a closed-loop integrated detection system. This leads to drawbacks when applied to pesticide residue detection in grains and oils, including process interruptions, potential sample loss or contamination, and cumbersome operation procedures, ultimately affecting the accuracy, efficiency, and convenience of the detection. Utility Model Content

[0004] This invention provides a pesticide residue detection device for grains and oils to solve the problems of low extraction efficiency and cumbersome procedures in existing pesticide residue detection equipment.

[0005] This utility model achieves the above objectives through the following technical solution: a pesticide residue detection device for grain and oil foods, comprising a distillation tank, wherein the distillation tank is sequentially connected to a condensation guiding component, a pesticide residue enrichment component and a diversion detection component;

[0006] The bottom of the distillation tank is connected to a steam generator, and the inside of the distillation tank is arranged from top to bottom as follows: a distillation support screen, an electric heating wire mesh, and a flow equalization plate.

[0007] The condensation guide assembly includes a spiral inner tube and a spiral outer tube that are sleeved and connected. The bottom end of the spiral inner tube is provided with an eluent delivery pipe. The connection between the spiral inner tube, the eluent delivery pipe and the pesticide residue enrichment assembly is provided with a liquid inlet three-way valve.

[0008] The pesticide residue enrichment component includes an enrichment outer tube and a solid phase extraction adsorption packing material placed inside the tube. The diversion detection component includes a waste liquid tube and an eluent tube. A three-way valve is provided at the connection point between the bottom of the waste liquid tube, the eluent tube and the bottom of the enrichment outer tube. A drip nozzle is connected to the bottom of the eluent tube, and a test strip is movably placed below the drip nozzle.

[0009] As a further embodiment of this utility model: the bottom of the distillation tank is vertically connected to multiple evenly distributed support rods, and the inner side of the support rods is fixedly connected to a bottom support plate, and the steam generator is fixedly placed on the bottom support plate.

[0010] As a further embodiment of this utility model: a conical lid is movably held at the upper opening of the distillation jar, the top of the conical lid is connected to a flow guide bend, a friction surface is provided on the inner side of the part where the conical lid and the upper opening of the distillation jar meet, and a thermal expansion sealing ring is embedded in the outer wall of the upper opening of the distillation jar.

[0011] As a further embodiment of this utility model: granular grain and oil products to be tested are placed on a distillation tray inside the distillation tank, and distillation filter paper is also laid on the distillation tray, with powdered grain and oil products to be tested placed on the distillation filter paper.

[0012] As a further improvement of this utility model: a variable diameter connecting pipe is provided between the conical tank cover and the condensation guide assembly. The large diameter end of the variable diameter connecting pipe is connected to the guide bend, the small diameter end of the variable diameter connecting pipe is connected to the spiral inner tube, and the large diameter end of the variable diameter connecting pipe is connected to the guide bend.

[0013] As a further improvement of this utility model: the bottom end of the spiral outer tube is connected to a cooling water inlet pipe, and the top end of the spiral outer tube is connected to a cooling water outlet pipe.

[0014] As a further improvement of this utility model: a conical flow guide is fixedly connected inside the outer tube of the pesticide residue enrichment component. The conical flow guide is located above the solid phase extraction adsorption packing material. The top of the conical flow guide is located directly below the liquid inlet of the outer tube. Several drip holes are opened on the body of the conical flow guide.

[0015] As a further improvement of this utility model: the bottom of the enrichment outer tube is provided with a stepped bottom surface, and the bottom of the enrichment outer tube is connected to an outlet tube.

[0016] As a further improvement of this utility model: the eluent tube of the diversion detection component is connected to a collection ball, the drip nozzle is connected to the bottom end of the collection ball, and a drip valve is connected to the drip nozzle.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model is equipped with a distillation tank, a condensation and flow guiding component, a pesticide residue enrichment component, and a diversion and detection component. The equipment realizes the integrated operation of the entire process from extraction to detection through the sequential connection of the condensation and flow guiding component, the pesticide residue enrichment component, and the diversion and detection component.

[0019] 2. The distillation jar of this utility model has a steam generator connected to its bottom. Inside the distillation jar, from top to bottom, there are a distillation support mesh, an electric heating wire mesh, and a flow equalization plate. The design separates the distillation jar from the steam generator. The connection of the steam generator to the bottom of the distillation jar allows water vapor to enter the distillation area evenly from the bottom, avoiding the problem of local overheating of the sample caused by direct heating. The distillation jar adopts a three-layer structure design. The distillation support mesh is used to support the solid sample. The electric heating wire mesh can assist in heating the rising steam to form superheated steam, which can effectively extract high-boiling-point pesticide residues. The flow equalization plate ensures that the steam is evenly distributed and penetrates the sample layer.

[0020] 3. The condensation guide assembly of this utility model includes a spiral inner tube and a spiral outer tube that are sleeved together. The bottom end of the spiral inner tube is provided with an eluent delivery tube. The connection between the spiral inner tube, the eluent delivery tube and the pesticide residue enrichment assembly is provided with a liquid inlet three-way valve. The sleeved connection of the spiral inner tube and the spiral outer tube forms a high-efficiency condensation channel. The eluent delivery tube at the bottom end of the spiral inner tube, together with the liquid inlet three-way valve, can directly introduce the eluent after enrichment, avoiding sample transfer loss.

[0021] 4. The pesticide residue enrichment component of this utility model includes an enrichment outer tube and a solid-phase extraction adsorption packing material placed inside the tube. The diversion detection component includes a waste liquid tube and an eluent tube. A three-way valve is provided at the connection point between the waste liquid tube, the eluent tube, and the bottom of the enrichment outer tube. A drip nozzle is connected to the bottom of the eluent tube, and a test strip is movably placed below the drip nozzle. The pesticide residue enrichment component selectively adsorbs and enriches pesticide residues in the condensate through the solid-phase extraction adsorption packing material, greatly improving the detection sensitivity. The diversion detection component achieves the diversion of waste liquid and eluent through the three-way valve, and finally accurately drips the concentrated eluent onto the test strip through the drip nozzle. This realizes a fully closed operation from sample processing to detection results, reducing human error and environmental pollution risks, and is particularly suitable for on-site rapid detection scenarios. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the distillation tank structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the distillation tank of this utility model;

[0025] Figure 4 This is a schematic diagram of the disassembled structure of the distillation filter paper, distillation support, heating wire mesh, and flow equalization plate of this utility model.

[0026] Figure 5 This is a schematic diagram of the cross-sectional structure of the conical can lid of this utility model;

[0027] Figure 6 This is a schematic diagram of the condensation guide component of this utility model;

[0028] Figure 7 This is a cross-sectional structural diagram of the pesticide residue enrichment component of this utility model.

[0029] Figure 8 This is a schematic diagram of the shunt detection component of this utility model.

[0030] In the diagram: 1. Distillation tank; 11. Steam generator; 12. Support rod; 13. Base plate; 14. Thermal expansion sealing ring; 15. Distillation filter paper; 16. Distillation mesh; 17. Heating wire mesh; 18. Flow equalization orifice plate; 2. Conical tank cover; 21. Guide bend; 22. Friction surface; 3. Variable diameter connecting pipe; 4. Condensation guide assembly; 41. Spiral inner tube; 42. Spiral outer tube; 43. Cooling water inlet pipe; 44. Cooling... 45. Water output pipe; 46. Inlet three-way valve; 5. Eluent delivery pipe; 6. Pesticide residue enrichment component; 51. Enrichment outer pipe; 52. Solid phase extraction adsorption packing; 53. Conical flow guide hood; 54. Stepped bottom surface; 55. Outlet pipe; 56. Dropping hole; 6. Diversion detection component; 61. Outlet three-way valve; 62. Waste liquid pipe; 63. Eluent pipe; 64. Collection ball; 65. Dropping nozzle; 66. Dropping valve; 7. Test strip. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] like Figures 1 to 8 As shown, a pesticide residue detection device for grain and oil foods includes a distillation tank 1, which is sequentially connected to a condensation guiding component 4, a pesticide residue enrichment component 5, and a diversion detection component 6. The device achieves integrated operation of the entire process from extraction to detection through the sequential connection of the condensation guiding component 4, the pesticide residue enrichment component 5, and the diversion detection component 6.

[0034] The bottom of the distillation vessel 1 is connected to a steam generator 11. Inside the distillation vessel 1, from top to bottom, there are a distillation support mesh 16, an electric heating wire mesh 17, and a flow equalization plate 18. The distillation vessel 1 is designed to be separate from the steam generator 11. The bottom of the distillation vessel 1 is connected to the steam generator 11 so that water vapor can enter the distillation area evenly from the bottom, avoiding the problem of local overheating of the sample caused by direct heating. The distillation vessel 1 adopts a three-layer structure design. The distillation support mesh 16 is used to support the solid sample. The electric heating wire mesh 17 can assist in heating the rising steam to form superheated steam, which can effectively extract high-boiling-point pesticide residues. The flow equalization plate 18 ensures that the steam is evenly distributed and penetrates the sample layer.

[0035] The condensation guide assembly 4 includes a spiral inner tube 41 and a spiral outer tube 42 that are sleeved and connected. The bottom end of the spiral inner tube 41 is provided with an eluent delivery tube 46. The connection between the spiral inner tube 41, the eluent delivery tube 46 and the pesticide residue enrichment assembly 5 is provided with a liquid inlet three-way valve 45. The spiral outer tube 42 is sleeved on the outer layer of the spiral inner tube 41, so that a high-efficiency condensation channel is formed inside the spiral inner tube 41. The eluent delivery tube 46 at the bottom end of the spiral inner tube 41, together with the liquid inlet three-way valve 45, can directly introduce the eluent after enrichment, avoiding sample transfer loss.

[0036] The pesticide residue enrichment component 5 includes an enrichment outer tube 51 and a solid-phase extraction adsorption packing material 52 placed inside the tube. The split detection component 6 includes a waste liquid tube 62 and an eluent tube 63. A three-way valve 61 is provided at the connection point between the waste liquid tube 62, the eluent tube 63, and the bottom of the enrichment outer tube 51. A dropper 65 is connected to the bottom of the eluent tube 63, and a test strip 7 is movably placed below the dropper 65. The pesticide residue enrichment component 5 selectively adsorbs and enriches pesticide residues in the condensate through the solid-phase extraction adsorption packing material 52, which greatly improves the detection sensitivity. The split detection component 6 realizes the separation of waste liquid and eluent through the three-way valve 61. Finally, the concentrated eluent is accurately dripped onto the test strip 7 through the dropper 65, realizing a fully closed operation from sample processing to detection results, reducing human operation error and environmental pollution risk, and is particularly suitable for on-site rapid detection scenarios.

[0037] Example 2

[0038] Improvements based on Example 1:

[0039] like Figures 1 to 4 As shown, the bottom of the distillation tank 1 is vertically connected to multiple evenly distributed support rods 12. The inner side of the support rods 12 is fixedly connected to a bottom support plate 13. The steam generator 11 is fixedly placed on the bottom support plate 13. The support rods 12 provide stable support for the distillation tank 1. The fixed connection between the bottom support plate 13 and the support rods 12 forms a stable bearing platform, which keeps the steam generator 11 at an appropriate distance from the bottom of the distillation tank 1, avoiding uneven heat conduction caused by direct contact. At the same time, it provides good air circulation space for the bottom of the distillation tank 1, which helps to dissipate residual heat.

[0040] Furthermore, a conical lid 2 is movably secured to the upper opening of the distillation tank 1. A guide bend 21 connects to the top of the conical lid 2. A friction surface 22 is provided on the inner side of the joint between the conical lid 2 and the upper opening of the distillation tank 1. A thermal expansion sealing ring 14 is embedded in the outer wall of the upper opening of the distillation tank 1. The conical design of the lid 2 optimizes the steam flow path, allowing steam to smoothly enter the guide bend 21. The arc-shaped design of the guide bend 21 prevents steam condensate from accumulating. The friction surface 22 increases the height of the joint between the distillation tank 1 and the conical lid 2. The sealing performance of the part; at the same time, the thermal expansion sealing ring 14 can expand in volume as the temperature rises, automatically increasing the sealing pressure and forming an adaptive seal. It provides sufficient pre-tightening force to prevent leakage at room temperature, and continuously improves the sealing effect as the temperature rises during the high-temperature distillation stage, preventing the escape of volatile components. It should be noted that the thermal expansion sealing ring 14 can be made of expanded graphite, which is made of natural graphite through chemical treatment. It is rich in worm-like micropores. When heated, the residual compounds in these micropores vaporize, generating thrust, causing the graphite to expand rapidly along the axial direction.

[0041] Furthermore, granular grain and oil samples to be tested are placed on a distillation tray 16 inside the distillation tank 1. Distillation filter paper 15 is also laid on the distillation tray 16, and powdered grain and oil samples to be tested are placed on the distillation filter paper 15. It should be noted that the distillation filter paper 15 can be made of pure fiber filter paper. The distillation tray 16 itself provides a stable support platform for granular grain and oil samples, ensuring that steam can penetrate the sample layer evenly. The addition of distillation filter paper 15 is specifically for the processing needs of powdered samples, effectively preventing fine powder from falling through the mesh and causing loss or contamination of the steam generator 11. The fiber structure of the distillation filter paper 15 has a dual function: it can effectively block powder leakage and promote uniform steam distribution through capillary action, improving extraction efficiency. Moreover, the distillation filter paper 15 can be used only once and can be discarded along with the sample residue after the experiment, simplifying the cleaning process and avoiding cross-contamination between different samples, making it particularly suitable for continuous testing scenarios.

[0042] like Figure 1 , Figure 5 and Figure 6 As shown, a variable diameter connecting pipe 3 is provided between the conical tank cover 2 and the condensation guide assembly 4. The large diameter end of the variable diameter connecting pipe 3 is connected to the guide bend 21, and the small diameter end of the variable diameter connecting pipe 3 is connected to the spiral inner pipe 41. The connection between the large diameter end of the variable diameter connecting pipe 3 and the guide bend 21 effectively collects the wide-amplitude steam discharged from the distillation tank 1 and avoids the flow resistance caused by the sudden change in cross-section. The gradually narrowing small diameter end matches the spiral inner pipe 41 to achieve a smooth transition of the steam flow state and prevent the generation of eddies and pressure loss. It increases the flow rate of steam entering the condensation assembly, enhances the turbulence in the condenser tube, thereby strengthening the heat transfer efficiency, preventing premature condensation of steam during transmission, and ensuring that volatile pesticide components completely enter the condensation stage.

[0043] Furthermore, the bottom end of the spiral outer tube 42 is connected to a cooling water inlet pipe 43, and the top end of the spiral outer tube 42 is connected to a cooling water outlet pipe 44, so that the cooling water can flow from bottom to top, ensuring that the entire spiral outer tube 42 is filled with liquid, so that the cooling water flows in the opposite direction and forms an efficient counter-current heat exchange with the internal steam flow, thereby improving the heat exchange efficiency.

[0044] like Figure 1 and Figure 7 As shown, a conical flow guide hood 53 is also fixedly connected inside the enrichment outer tube 51 of the pesticide residue enrichment component 5. The conical flow guide hood 53 is located above the solid phase extraction adsorption packing 52. The top of the cone of the conical flow guide hood 53 is located directly below the liquid inlet of the enrichment outer tube 51. The body of the conical flow guide hood 53 is provided with several drip holes 56, so that the incoming condensate or eluent first impacts the top of the cone, and then spreads out evenly radially along the cone surface. The several drip holes 56 provided on the body of the hood form a uniform droplet distribution, ensuring that the liquid uniformly covers the entire cross-section of the solid phase extraction adsorption packing 52 in a waterfall shape, eliminating the phenomenon of flow deviation, and improving the effective utilization rate of the solid phase extraction adsorption packing 52.

[0045] Furthermore, the bottom of the enrichment outer tube 51 is provided with a stepped bottom surface 54, and the bottom of the enrichment outer tube 51 is connected to the liquid outlet pipe 55. The stepped bottom surface 54 forms a gradually narrowing flow channel, which is conducive to the liquid gathering at the bottom of the packing and being smoothly guided to the liquid outlet pipe 55, ensuring that the liquid after adsorption and enrichment enters the liquid outlet pipe 55 in a laminar flow state, preventing the redissolution or desorption of the adsorbed components; at the same time, the stepped bottom surface 54 can also provide a supporting foundation for the solid phase extraction adsorption packing 52, preventing the packing from being lost or displaced.

[0046] like Figure 1 and Figure 8 As shown, the eluent tube 63 of the split detection component 6 is connected to a collection ball 64, and a dropper 65 is connected to the bottom end of the collection ball 64. A dropper valve 66 is connected to the dropper 65. The spherical structure of the collection ball 64 provides sufficient volume to collect the initial eluent, ensuring that the eluent is fully mixed and eliminating uneven concentration. The configuration of the dropper valve 66 allows the operator to control the timing and speed of eluent addition, avoiding detection errors caused by adding too early or too late.

[0047] Working principle: First, the sample to be tested is placed on the distillation tray 16 inside the distillation tank 1. When processing powdered samples, distillation filter paper 15 is also required to prevent leakage. After the equipment is started, the water vapor generated by the steam generator 11 enters from the bottom of the distillation tank 1. After being evenly distributed through the flow equalization plate 18, it penetrates the electric heating wire mesh 17 and is heated to form superheated steam. The superheated steam continuously penetrates the sample layer, causing the pesticide residue components in it to volatilize and escape with the steam. The mixed steam carrying pesticide residues enters the variable diameter connecting pipe 3 through the guide bend 21 under the guidance of the conical tank cover 2 to complete the flow channel transition optimization. Then the mixed steam enters the spiral inner tube 41 of the condensation guide assembly 4.

[0048] Cooling water enters the spiral outer tube 42 through the cooling water inlet pipe 43 and flows in the opposite direction along the spiral channel. It undergoes efficient countercurrent heat exchange with the steam in the spiral inner tube 41, causing the steam to condense into liquid. The liquid formed by the condensation of steam flows towards the pesticide residue enrichment component 5 under the action of gravity. It first impacts the cone top of the conical guide shroud 53, and then is evenly dispersed onto the surface of the solid phase extraction adsorption packing 52 below through the drip hole 56. At this stage, pesticide residues are selectively adsorbed and enriched, while the waste liquid is discharged through the waste liquid pipe 62 via the liquid outlet three-way valve 61.

[0049] After adsorption is completed, the flow path is switched through the inlet three-way valve 45 to allow the eluent in the eluent delivery pipe 46 to enter. The eluent flows through the solid phase extraction adsorption packing 52 to dissolve and elute the enriched pesticide residues. The concentrated eluent is then switched through the outlet three-way valve 61 to enter the eluent pipe 63, and then flows into the collection ball 64 for temporary storage and concentration homogenization.

[0050] Finally, the operator controls the eluent to be added to the reaction area of ​​the test strip 7 in the form of standard droplets from the dropper 65 by adjusting the dripping valve 66. By observing the color change of the test strip 7 and comparing it with the standard colorimetric card or by using image analysis equipment, the semi-quantitative or quantitative detection of pesticide residues can be achieved.

[0051] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pesticide residue detection device for grain and oil foods, comprising a distillation tank (1), characterized in that: The distillation tank (1) is sequentially connected to a condensation guide assembly (4), a pesticide residue enrichment assembly (5), and a diversion detection assembly (6). The bottom of the distillation tank (1) is connected to a steam generator (11), and the inside of the distillation tank (1) is provided with a distillation support mesh (16), an electric heating wire mesh (17) and a flow equalization plate (18) from top to bottom. The condensation guide assembly (4) includes a spiral inner tube (41) and a spiral outer tube (42) connected in a sleeve. The bottom end of the spiral inner tube (41) is provided with an eluent delivery pipe (46). The connection between the spiral inner tube (41), the eluent delivery pipe (46) and the pesticide residue enrichment assembly (5) is provided with a liquid inlet three-way valve (45). The pesticide residue enrichment component (5) includes an enrichment outer tube (51) and a solid phase extraction adsorption packing (52) placed inside the tube. The diversion detection component (6) includes a waste liquid tube (62) and an eluent tube (63). A three-way valve (61) is provided at the connection point of the bottom of the waste liquid tube (62), the eluent tube (63) and the enrichment outer tube (51). A dropper (65) is connected to the bottom of the eluent tube (63). A test strip (7) is movably placed below the dropper (65).

2. The pesticide residue detection equipment for grain and oil foods according to claim 1, characterized in that: The bottom of the distillation tank (1) is vertically connected to a plurality of evenly distributed support rods (12), and the inner side of the support rods (12) is fixedly connected to a base plate (13), and the steam generator (11) is fixedly placed on the base plate (13).

3. The pesticide residue detection equipment for grain and oil foods according to claim 1, characterized in that: The upper opening of the distillation tank (1) is fitted with a conical lid (2), the top of the conical lid (2) is connected to a flow guide bend (21), the inner side of the part where the conical lid (2) meets the upper opening of the distillation tank (1) is provided with a friction surface (22), and the outer wall of the upper opening of the distillation tank (1) is embedded with a thermal expansion sealing ring (14).

4. The pesticide residue detection equipment for grain and oil foods according to claim 1, characterized in that: The distillation tank (1) has a distillation tray (16) inside which granular grain and oil food to be tested is placed. The distillation tray (16) is also covered with distillation filter paper (15), and the distillation filter paper (15) is placed with powdered grain and oil food to be tested.

5. The pesticide residue detection equipment for grain and oil foods according to claim 3, characterized in that: A variable diameter connecting pipe (3) is provided between the conical tank cover (2) and the condensation guide assembly (4). The large diameter end of the variable diameter connecting pipe (3) is connected to the guide bend (21), and the small diameter end of the variable diameter connecting pipe (3) is connected to the spiral inner tube (41).

6. The pesticide residue detection equipment for grain and oil foods according to claim 1, characterized in that: The bottom end of the spiral outer tube (42) is connected to a cooling water inlet pipe (43), and the top end of the spiral outer tube (42) is connected to a cooling water outlet pipe (44).

7. The pesticide residue detection equipment for grain and oil foods according to claim 1, characterized in that: The pesticide residue enrichment component (5) is further fixedly connected to the enrichment outer tube (51) with a conical flow guide hood (53). The conical flow guide hood (53) is located above the solid phase extraction adsorption packing (52). The top of the conical flow guide hood (53) is located directly below the liquid inlet of the enrichment outer tube (51). The body of the conical flow guide hood (53) is provided with several drip holes (56).

8. The pesticide residue detection equipment for grain and oil foods according to claim 1, characterized in that: The bottom of the enrichment tube (51) is provided with a stepped bottom surface (54), and the bottom of the enrichment tube (51) is connected to an outlet tube (55).

9. The pesticide residue detection equipment for grain and oil foods according to claim 1, characterized in that: The eluent tube (63) of the diversion detection component (6) is connected to a collection ball (64), the drop nozzle (65) is connected to the bottom end of the collection ball (64), and a drop valve (66) is connected to the drop nozzle (65).

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