A sampling and detection device for pesticide residues in crops and a method for using the same

Abstract

The invention discloses a sampling and detection device for pesticide residues in crops and a use method thereof, and belongs to the technical field of sampling and detection of pesticide residues in crops. The sampling and detection device for pesticide residues in crops and the use method thereof comprise a sampling tank and a detector fixed beside the sampling tank, a movable frame is slidably connected through the detector, a plurality of liquid sampling boxes are fixed at equal intervals on both sides of the upper end surface of the movable frame, and a plurality of solid sampling boxes are fixed on the movable frame, liquid outlets for controlling the discharge of detection liquid are symmetrically arranged on both sides of the bottom surface of the sampling tank, a plurality of circular holes are opened on the bottom surface of the sampling tank along the circumference of the axis direction, and the positions of the circular holes correspond to the positions of the solid sampling boxes on the movable frame; a sampling mechanism for switching sampling of crop surface cleaning liquid and crop local samples is arranged in the sampling tank; the sampling and detection device can sample and detect the pesticide residue content inside and outside the agricultural products, and improve the accuracy of pesticide residue detection.

Description

Technical Field

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

[0002] The detection of pesticide residues in crops is an important part of ensuring the safety of agricultural products. Instrument detection can be used to timely discover and control the problem of excessive pesticide residues in agricultural products, thereby ensuring consumer health and food safety. Before testing, the crops are sampled and the samples are introduced into the testing instrument to detect and analyze the pesticide residue content of the crops. The preparation of the sampling samples greatly affects the accuracy of pesticide residue detection.

[0003] For example, the patent with publication number CN214408672U discloses a device for detecting pesticide residues in agricultural products, including a sample processing device and a pesticide analyzer; the sample processing device includes a spray crushing mechanism, a sampling tube and a cover plate, the cover plate is arranged at the top of the sampling tube and is used to close the sampling tube; the output end of the sampling tube is connected to the input end of the pesticide analyzer, and the sampling tube provides liquid containing pesticides for the pesticide analyzer; the spray crushing mechanism includes a spray crushing part, a rotating drive part, a lifting plate and a lifting drive part, the lifting drive part is arranged on the cover plate and connected to the lifting plate, and the lifting drive part drives the lifting plate to move up and down; the lifting plate is clearance-matched with the inner side of the sampling tube; the rotating drive part is arranged on the lifting plate and connected to the spray crushing part, and the rotating drive part drives the spray crushing part to rotate; the spray crushing part is arranged in the sampling tube and is used to spray the outer surface of the agricultural product, or crush the agricultural product; the sampling detection device can quickly detect the pesticide residue on the surface and inside of the agricultural product.

[0004] For another example, the patent with publication number CN214952278U discloses a portable sampling device for detecting pesticide residues in agricultural products, including a sampling rod, which is threadedly connected to a sampling column, and sampling spoons are fixed on both sides of the sampling rod and the sampling column; the application holds the grip rod, pierces the needle into melon agricultural products, inserts the sampling rod and the sampling column into the melon agricultural products, distributes the sampling column and the sampling spoons on the sampling rod at different positions inside the melon agricultural products, rotates the sampling column and the sampling rod, rotates the sampling spoon inside the melon agricultural products, scrapes the fleshy part of the melon agricultural products into the sampling spoon, pulls out the sampling rod, collects samples from different parts of the melon agricultural products in the sampling spoon, completes sampling, and is conducive to detecting pesticide residues at different positions of the melon agricultural products. By rotating the sampling column to separate from the sampling rod, rotating the grip rod to separate from the sampling column, the sampling rod, the sampling column and the grip rod are separated, the length is reduced, and it is easy to carry.

[0005] For example, the patent with publication number CN215677759U discloses a device for detecting pesticide residues in agricultural products, including a main body, a detector is fixedly arranged at the bottom end of the main body, a stirring chamber is fixedly arranged at the bottom end of the detector, a first rotating shaft is vertically arranged at the bottom end of the stirring chamber, and stirring rods are evenly distributed on the surface of the first rotating shaft; a crushing chamber is fixedly arranged at the top end of the stirring chamber, a second rotating shaft is horizontally arranged inside the crushing chamber, and a spiral blade is fixedly arranged on the surface of the second rotating shaft; a feed port is fixedly arranged at the top end of the crushing chamber, and a top cover is arranged on the top surface of the feed port; the stirring chamber and the crushing chamber are arranged inside the device for detecting pesticide residues in agricultural products, and a spiral blade is arranged in the crushing chamber, which can The agricultural products to be tested are crushed to facilitate sampling and testing; a stirring rod is provided in the mixing chamber, which can mix the test liquid and the test reagent evenly for easy testing; and both the spiral blade and the stirring rod can be driven by a motor, saving time and effort; some crops with spherical structures such as apples and tomatoes have different pesticide residue components in their skin and pulp at different positions. Some existing sampling and testing devices are not convenient for sampling multiple samples from different positions of agricultural products. The singleness of the sampling position and the singleness of the sampling method directly affect the accuracy of the pesticide residue detection results. In addition, some samples are thicker. In order to ensure the accurate determination of subsequent pesticide residue detection, the samples need to be further sliced ​​after sampling, which increases the amount of manual operation.

[0006] In view of the above problems, it is urgently necessary to carry out innovative designs based on the existing crop pesticide residue sampling and detection devices. Summary of the invention

[0007] The purpose of the present invention is to provide a sampling and detection device for pesticide residues in crops and a method of using the same, so as to solve the problem raised in the above background technology that some existing sampling and detection devices are not convenient for sampling multiple samples at different positions of agricultural products, and the singleness of the sampling position and the singleness of the sampling method directly affect the accuracy of the pesticide residue detection results.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sampling and detection device for pesticide residues in crops and a method of using the same, comprising a sampling tank and a detector fixed beside the sampling tank, wherein a movable frame is slidably connected through the detector, a plurality of liquid sampling boxes are fixed at equal intervals on both sides of the upper end surface of the movable frame, and a plurality of solid sampling boxes are fixed on the movable frame, liquid outlets for controlling the discharge of detection liquid are symmetrically arranged on both sides of the bottom surface of the sampling tank, a plurality of circular holes are opened on the bottom surface of the sampling tank along the circumference of the axis direction, and the positions of the circular holes correspond to the positions of the solid sampling boxes on the movable frame; a sampling mechanism for switching the sampling of crop surface cleaning liquid and crop local samples is arranged in the sampling tank; a cutting mechanism for cutting solid samples is arranged outside the sampling tank.

[0009] Preferably, the sampling mechanism includes a fixed pile fixed to the inner bottom surface of the sampling tank, a disc seat is fixedly installed on the fixed pile, and a turntable is coaxially rotatably installed on the disc seat along the axial direction; the external sliding sleeve of the fixed pile is provided with a mesh cover disk, and a steering seat is coaxially rotatably installed in the mesh cover disk along the axial direction.

[0010] Preferably, a plurality of blocking columns are fixed at equal angles on the upper surface of the steering seat, a plurality of lower sampling ports are opened at equal angles on the steering seat, and the lower sampling ports and the blocking columns are on the same circumference and are distributed at intervals; a plurality of sampling channels are fixed at equal angles on the lower surface of the steering seat, the sampling channels are coaxially connected with the lower sampling ports, and the positions of the sampling channels correspond to the positions of the circular holes; a plurality of upper sampling ports are opened at equal angles on the disc seat.

[0011] Preferably, the blocking columns and the sampling channel are spaced apart on the same circumference, and the blocking columns are moved downward to be connected with the circular holes.

[0012] Preferably, a guide column is coaxially fixedly connected to the inner bottom surface of the sampling tank, and an upper straight groove, an oblique groove and a lower straight groove are sequentially opened on the surface of the guide column from top to bottom. The upper straight groove, the oblique groove and the lower straight groove are through-connected, and the steering seat is slidably connected to the guide column along the direction of the upper straight groove, the oblique groove and the lower straight groove.

[0013] Preferably, a water retaining bar is fixedly installed on the inner bottom surface of the sampling tank, and the water retaining bar is separated between the liquid outlet and the circular hole; nozzles are symmetrically fixed on both sides of the sampling tank, and a lower electric-driven lifting rod is fixedly installed on the inner wall of the sampling tank, and a lifting frame is fixedly connected to the output end of the lower electric-driven lifting rod, and the lifting frame is fixedly connected to the mesh cover plate.

[0014] Preferably, a sealing cover is snap-fitted on the upper end of the sampling tank, and a rotating rod is coaxially rotatably connected to the inner top surface of the sealing cover, a pressure block is telescopically connected to the lower side of the rotating rod, and a limiting spring is elastically connected between the pressure block and the rotating rod; the outer sleeve of the rotating rod is connected to a top plate, and a plurality of upper electric-driven lifting rods are fixed at equal angles on the lower surface of the top plate, a sampling column is fixedly installed on the outside of the upper electric-driven lifting rod shell, a push plate is slidably installed on the inner wall of the sampling column, and the push plate is fixedly connected to the output end of the upper electric-driven lifting rod; threaded rods are rotatably installed on both sides of the inner top surface of the sealing cover, and an internally threaded frame is provided on the external threaded sleeve of the threaded rod, and the internally threaded frame is fixedly connected to the top plate.

[0015] Preferably, the cutting mechanism includes a blade rotatably mounted on the bottom surface of the sampling tank, on which a driven gear is fixedly mounted along the direction of the rotation axis; a double-toothed ring is rotatably mounted on the bottom surface of the sampling tank, and a hollow transmission gear is rotatably mounted on the bottom surface of the sampling tank, and a driving gear is rotatably connected to the outside of the sampling tank, and the driving gear, the hollow transmission gear, the double-toothed ring and the driven gear are meshed and connected in sequence; the hollow transmission gear is sleeved on the outside of the liquid outlet on one side of the bottom of the sampling tank.

[0016] Preferably, a driving rod is coaxially fixedly connected to the driving gear, and a plurality of cross bars are fixed at equal intervals on the bottom surface of the movable frame. The driving rod rotates to push the cross bars to move in a directional and fixed distance.

[0017] A device for sampling and detecting pesticide residues in crops is disclosed, and a method of use is also disclosed. The specific steps of the method are as follows:

[0018] S1. Fix the sampled crops and place them in the sampling tank to limit the sampling position and keep the sampling stable.

[0019] S2. Liquid sampling: spray liquid onto the surface of crops through a nozzle. The liquid carries the pesticides on the surface of the crops, and the liquid sample is introduced into the liquid sampling box through the liquid outlet.

[0020] S3, solid sampling, sampling is performed at different positions of the crops by pressing down the sampling column, and the push plate is moved to discharge the solid sample in the sampling column outward.

[0021] S4, solid slicing, controlling the rotation of the blade to slice the solid sample squeezed out of the sampling channel to refine the solid sample.

[0022] S5, mobile detection, through the mobile rack to control the fixed sample and liquid sample to move to the detector, detect and analyze the pesticide residue ratio of crops.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: when using the crop pesticide residue sampling and detection device, the agricultural products are placed in a sampling tank, the outside of the agricultural products are first rinsed with a nozzle, the rinsed liquid is sampled, the liquid is tested for pesticide residues, the pesticide residue content on the outside of the agricultural products is analyzed, and then solid sampling of the agricultural products is performed, and the pesticide residue content of the agricultural products is deeply detected through the two solid and liquid samples.

[0024] Furthermore, a sampling mechanism for switching between sampling crop surface cleaning liquid and crop local samples is provided in the sampling tank, and the mesh cover plate is controlled to move upward. The sealing column on the mesh cover plate is engaged and sealed in the upper sampling port made on the disc, and the outside of the agricultural products is rinsed through the nozzle. The rinsing liquid flows through the mesh holes on the side of the mesh cover plate to the bottom of the sampling tank, and finally the liquid sample is discharged into the liquid sampling box through the liquid outlet.

[0025] The mesh cover plate is controlled to move downward. During the downward movement, the steering seat in the mesh cover plate rotates under the guidance of the groove of the guide column. The lower sampling port on the steering seat rotates to the position directly below the upper sampling port. The sampling column is controlled to move downward to cut and sample the agricultural products. The sample is pushed downward by the push plate and extruded, and the extruded sample enters the solid sampling box.

[0026] Furthermore, a cutting mechanism for cutting solid samples is arranged on the outside of the sampling tank. During the solid sample extrusion process, the blade is driven to rotate through the meshing transmission of the driving gear, the hollow transmission gear, the double gear ring and the driven gear. The blade rotates and slices the sample extruded from the circular hole, so that the thin slice sample enters the solid sampling box.

[0027] When the active gear is controlled to rotate, the active gear drives the driving rod to rotate synchronously. The rotation of the driving rod intermittently pushes the cross bars at different positions below the mobile frame to move in a directional and fixed distance, so that the mobile frame drives multiple groups of solid sampling boxes and liquid sampling boxes into the detector, so as to sample and analyze samples at different positions of agricultural products and improve the accuracy of pesticide residue detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the detector of the present invention.

[0029] Figure 2 This is a schematic diagram of the separation structure of the sampling tank and the sealing cover of the present invention.

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of the sampling tank of the present invention.

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the lifting frame of the present invention.

[0032] Figure 5 It is a schematic diagram of the cross-sectional structure of the disc seat of the present invention.

[0033] Figure 6 It is a schematic diagram of the three-dimensional structure of the mesh cover plate of the present invention.

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the blade of the present invention.

[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the guide rod of the present invention.

[0036] Fig. 9 It is a schematic diagram of the cross-sectional structure of the sealing cover of the present invention.

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure of the sampling column of the present invention.

[0038] Fig.11 It is a schematic diagram of the three-dimensional structure of the push plate of the present invention.

[0039] Fig.12 It is a schematic diagram of the three-dimensional structure of the double-toothed ring of the present invention.

[0040] Fig.13 It is a schematic diagram of the three-dimensional structure of the mobile frame of the present invention.

[0041] Fig.14It is a schematic diagram of the three-dimensional structure of the cross bar of the present invention.

[0042] In the figure: 1. sampling tank; 2. detector; 3. mobile frame; 4. liquid sampling box; 5. solid sampling box; 6. liquid outlet; 7. round hole; 8. fixed pile; 9. disc seat; 10. turntable; 11. mesh plate; 12. steering seat; 13. blocking column; 14. lower sampling port; 15. sampling channel; 16. upper sampling port; 17. water retaining bar; 18. nozzle; 19. lower electric drive lifting rod; 20. lifting frame; 21. sealing cover ; 22. rotating rod; 23. pressure block; 24. limit spring; 25. top plate; 26. upper electric drive lifting rod; 27. sampling column; 28. push plate; 291. threaded rod; 292. internal thread rack; 30. blade; 31. driven gear; 32. double gear ring; 33. hollow transmission gear; 34. driving gear; 35. driving rod; 36. cross bar; 37. guide column; 38. upper straight groove; 39. inclined groove; 40. lower straight groove. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1: Please refer to Figure 1-Figure 14 The present invention provides the following technical solutions: a sampling and detection device for pesticide residues in crops and a method of using the same, comprising a sampling tank 1 and a detector 2 fixed beside the sampling tank 1, a movable frame 3 is slidably connected through the detector 2, a plurality of liquid sampling boxes 4 are fixed at equal intervals on both sides of the upper end surface of the movable frame 3, and a plurality of solid sampling boxes 5 are fixed on the movable frame 3, liquid outlets 6 for controlling the discharge of detection liquid are symmetrically arranged on both sides of the bottom surface of the sampling tank 1, a plurality of circular holes 7 are opened on the bottom surface of the sampling tank 1 along the circumference of the axis direction, and the positions of the circular holes 7 correspond to the positions of the solid sampling boxes 5 on the movable frame 3; a sampling mechanism for switching the sampling of crop surface cleaning liquid and crop local samples is arranged in the sampling tank 1; a cutting mechanism for cutting solid samples is arranged outside the sampling tank 1.

[0045] The sampling mechanism includes a fixed pile 8 fixed to the inner bottom surface of the sampling tank 1, on which a disc seat 9 is fixedly installed, and a turntable 10 is coaxially rotatably installed on the disc seat 9 along the axial direction; the external sliding sleeve of the fixed pile 8 is provided with a mesh cover plate 11, and a steering seat 12 is coaxially rotatably installed in the mesh cover plate 11 along the axial direction.

[0046] A plurality of blocking columns 13 are fixed at equal angles on the upper surface of the steering seat 12, and a plurality of lower sampling ports 14 are opened at equal angles on the steering seat 12, and the lower sampling ports 14 and the blocking columns 13 are on the same circumference and are distributed at intervals; a plurality of sampling channels 15 are fixed at equal angles on the lower surface of the steering seat 12, the sampling channels 15 are coaxially connected with the lower sampling ports 14, and the positions of the sampling channels 15 correspond to the positions of the circular holes 7; a plurality of upper sampling ports 16 are opened at equal angles on the disc seat 9.

[0047] The blocking column 13 and the sampling channel 15 are spaced apart on the same circumference, and the blocking column 13 moves downward to penetrate and connect with the circular hole 7 .

[0048] A guide column 37 is coaxially fixedly connected to the inner bottom surface of the sampling tank 1, and an upper straight groove 38, an inclined groove 39 and a lower straight groove 40 are sequentially opened on the surface of the guide column 37 from top to bottom. The upper straight groove 38, the inclined groove 39 and the lower straight groove 40 are connected through, and the steering seat 12 is slidably connected to the guide column 37 along the direction of the upper straight groove 38, the inclined groove 39 and the lower straight groove 40.

[0049] A water retaining bar 17 is fixedly installed on the inner bottom surface of the sampling tank 1, and the water retaining bar 17 is separated between the liquid outlet 6 and the circular hole 7; nozzles 18 are symmetrically fixed on both sides of the sampling tank 1, and a lower electric-driven lifting rod 19 is fixedly installed on the inner wall of the sampling tank 1, and a lifting frame 20 is fixedly connected to the output end of the lower electric-driven lifting rod 19, and the lifting frame 20 is fixedly connected to the mesh cover plate 11.

[0050] A sealing cover 21 is snap-fitted on the upper end of the sampling tank 1, and a rotating rod 22 is coaxially rotatably connected to the inner top surface of the sealing cover 21, and a pressure block 23 is telescopically connected to the lower side of the rotating rod 22, and a limit spring 24 is elastically connected between the pressure block 23 and the rotating rod 22; a top plate 25 is sleeved on the outer side of the rotating rod 22, and a plurality of upper electric-driven lifting rods 26 are fixed at equal angles on the lower surface of the top plate 25, a sampling column 27 is fixedly installed on the outer side of the shell of the upper electric-driven lifting rod 26, and a push plate 28 is slidably installed on the inner wall of the sampling column 27, and the push plate 28 is fixedly connected to the output end of the upper electric-driven lifting rod 26; threaded rods 291 are rotatably installed on both sides of the inner top surface of the sealing cover 21, and an internally threaded frame 292 is threadedly sleeved on the outer side of the threaded rod 291, and the internally threaded frame 292 is fixedly connected to the top plate 25.

[0051] Before sampling, remove the sealing cover 21 from the sampling tank 1, place the crops on the turntable 10 in the sampling tank 1, and cover the sealing cover 21 with the pressing block 23 on the sealing cover 21 pressed on the top of the crops. The pressing block 23 pushes the limit spring 24 upward, so that the crops can be pressed between the pressing block 23 and the turntable 10 to maintain the stability of the crops during sampling.

[0052] Then, the electric-driven lifting rod 19 is operated to control the mesh cover plate 11 to move upward, so that the blocking column 13 on the mesh cover plate 11 is engaged and blocked in the upper sampling port 16 opened on the disc seat 9, and the motor on the sealing cover 21 is operated to drive the rotating rod 22 to rotate, and the rotating rod 22 drives the pressing block 23 below to rotate, and the pressing block 23 drives the turntable 10 to rotate in the middle position of the disc seat 9 by squeezing the crops, and liquid is sprayed on the surface of the crops through the nozzle 18. The liquid dissolves part of the pesticide residue on the surface of the crops, and the rinsed liquid flows through the mesh holes on the side of the mesh cover plate 11 to the space below the sampling tank 1, and the liquid is retained at the external position of the water retaining strip 17 on the bottom surface of the sampling tank 1. By opening a valve below the liquid outlet 6, the liquid sample at the bottom of the sampling tank 1 can be introduced into the corresponding liquid sampling box 4 below, so as to complete the sampling of the pesticide residue sample outside the crop.

[0053] The electric drive lifting rod 19 is operated to control the mesh cover plate 11 to move downward, and the mesh cover plate 11 is sleeved on the outside of the guide column 37 and moves. The mesh cover plate 11 moves from top to bottom along the upper straight groove 38, the inclined groove 39 and the lower straight groove 40, and moves vertically downward, rotates downward and moves vertically downward in sequence, so that when the mesh cover plate 11 moves downward to a state flush with the surface of the disc seat 9, the mesh cover plate 11 rotates once, and after the rotation, the position of the lower sampling port 14 opened inside the mesh cover plate 11 is connected and corresponds to the position of the upper sampling port 16. At this time, the motor on the running sealing cover 21 controls the threaded rod 291 The threaded rod 291 rotates, and the internal threaded frame 292 moves downward. The internal threaded frame 292 controls the top plate 25 and the sampling column 27 to move downward synchronously, so that the sampling column 27 contacts the crops and cuts the samples. The solid samples of the crops are embedded in the sampling column 27. The upper electric drive lifting rod 26 is operated to push the push plate 28 to move downward. The push plate 28 pushes the solid sample downward to squeeze out, so that the solid sample passes through the sampling channel 15 into the circular hole 7 below the sampling tank 1, and the fixed sample passes through the circular hole 7 into the solid sampling box 5 below, thereby completing the sampling of the solid sample.

[0054] Embodiment 2: Based on Embodiment 1, a slicing mechanism is further disclosed, and its specific structure is as follows: the slicing mechanism includes a blade 30 rotatably mounted on the bottom surface of the sampling tank 1, and a driven gear 31 is fixedly mounted on the blade 30 along the direction of the rotation axis; a double tooth ring 32 is rotatably mounted on the bottom surface of the sampling tank 1, and a hollow transmission gear 33 is rotatably mounted on the bottom surface of the sampling tank 1, and a driving gear 34 is rotatably connected to the outer side of the sampling tank 1, and the driving gear 34, the hollow transmission gear 33, the double tooth ring 32 and the driven gear 31 are meshed and connected in sequence; the hollow transmission gear 33 is sleeved on the outside of the liquid outlet 6 on one side of the bottom of the sampling tank 1.

[0055] A driving rod 35 is coaxially fixedly connected to the driving gear 34 , and a plurality of cross bars 36 are fixed at equal intervals on the bottom surface of the moving frame 3 . The driving rod 35 rotates to push the cross bars 36 to move in a certain direction and at a certain distance.

[0056] In the process of moving the push plate 28 to extrude the solid sample, the motor outside the sampling tank 1 is operated to control the driving gear 34 to rotate. The driving gear 34 drives the multiple blades 30 below the sampling tank 1 to rotate in the same direction through meshing transmission with the hollow transmission gear 33, the double gear ring 32 and the driven gear 31. The blades 30 intermittently slice the solid sample squeezed out of the circular hole 7 during the rotation process, so that the thin slice sample enters the solid sampling box 5 below.

[0057] The driving gear 34 drives the driving rod 35 to rotate synchronously during the rotation process. When the driving rod 35 rotates, it contacts the cross bar 36 at the bottom of the mobile frame 3 and pushes the cross bar 36 to move a fixed distance in the direction close to the detector 2. The driving rod 35 rotates one circle and pushes one cross bar 36 to move a fixed distance once. In the gap when the cross bar 36 and the mobile frame 3 stop moving, the blade 30 rotates and contacts the extruded solid sample to complete the slicing, so as to keep the sampling and mobile detection reasonably carried out. The driving rod 35 intermittently pushes the mobile frame 3 to move, so as to complete the detection of samples at different positions of the agricultural products, thereby improving the accuracy of the pesticide residue detection results.

[0058] A device for sampling and detecting pesticide residues in crops is disclosed, and a method of use is also disclosed. The specific steps of the method are as follows:

[0059] S1. Fix the sampled crops and place the crops in the sampling tank 1 to limit the sampling position and keep the sampling stable.

[0060] S2, liquid sampling, spraying liquid onto the surface of crops through the nozzle 18, the liquid carrying the pesticide on the surface of the crops, and introducing the liquid sample into the liquid sampling box 4 through the liquid outlet 6.

[0061] S3, solid sampling, sampling different positions of the crops by pressing down the sampling column 27, and moving the push plate 28 to discharge the solid sample in the sampling column 27 outward.

[0062] S4, solid slicing, controlling the blade 30 to rotate, slicing the solid sample squeezed out of the sampling channel 15, and thinning the solid sample.

[0063] S5, mobile detection, controlling the fixed sample and the liquid sample to move to the detector 2 through the mobile rack 3, and detecting and analyzing the pesticide residue ratio of the crops.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sampling and detection device for pesticide residues in crops, comprising a sampling tank (1) and a detector (2) fixed next to the sampling tank (1), characterized in that: A movable frame (3) is slidably connected to the detector (2), a plurality of liquid sampling boxes (4) are fixed at equal intervals on both sides of the upper end surface of the movable frame (3), and a plurality of solid sampling boxes (5) are fixed on the movable frame (3), and liquid outlets (6) for controlling the discharge of the detection liquid are symmetrically arranged on both sides of the bottom surface of the sampling tank (1), and a plurality of circular holes (7) are opened on the bottom surface of the sampling tank (1) along the circumference of the axis direction, and the positions of the circular holes (7) correspond to the positions of the solid sampling boxes (5) on the movable frame (3); The sampling tank (1) is provided with a sampling mechanism for switching between sampling crop surface cleaning liquid and crop local samples; The sampling tank (1) is provided with a cutting mechanism for cutting the solid sample on the outside; The sampling mechanism comprises a fixed pile (8) fixed to the inner bottom surface of the sampling tank (1), a disc seat (9) being fixedly mounted on the fixed pile (8), and a rotating disk (10) being coaxially mounted on the disc seat (9) for rotation along the axis direction; The outer sliding sleeve of the fixed pile (8) is provided with a mesh cover plate (11), and a steering seat (12) is coaxially rotatably mounted in the mesh cover plate (11) along the axial direction; The slicing mechanism comprises a blade (30) rotatably mounted on the bottom surface of the sampling tank (1), and a driven gear (31) is fixedly mounted on the blade (30) along the direction of the rotation axis; The bottom surface of the sampling tank (1) is rotatably mounted with a double toothed ring (32), and the bottom surface of the sampling tank (1) is rotatably mounted with a hollow transmission gear (33), and the outer side of the sampling tank (1) is rotatably connected with a driving gear (34), and the driving gear (34), the hollow transmission gear (33), the double toothed ring (32) and the driven gear (31) are meshed and connected in sequence; The hollow transmission gear (33) is sleeved on the outside of the liquid outlet (6) at one side of the bottom of the sampling tank (1); A driving rod (35) is coaxially fixedly connected to the driving gear (34), and a plurality of cross bars (36) are fixed at equal intervals on the bottom surface of the moving frame (3). The driving rod (35) rotates to push the cross bars (36) to move in a directional and fixed distance.

2. The crop pesticide residue sampling and detection device according to claim 1, characterized in that: A plurality of blocking columns (13) are fixed at equal angles on the upper surface of the steering seat (12); a plurality of down sampling ports (14) are opened at equal angles on the steering seat (12); and the down sampling ports (14) and the blocking columns (13) are on the same circumference and are spaced apart. A plurality of sampling channels (15) are fixed at equal angles on the lower surface of the steering seat (12); the sampling channels (15) are coaxially connected to the lower sampling port (14), and the positions of the sampling channels (15) correspond to the positions of the circular holes (7); The disc seat (9) is provided with a plurality of upper sampling ports (16) at equal angles.

3. A crop pesticide residue sampling and detection device according to claim 2, characterized in that: The blocking column (13) and the sampling channel (15) are spaced apart on the same circumference, and the blocking column (13) moves downward to penetrate and connect with the circular hole (7).

4. The crop pesticide residue sampling and detection device according to claim 2, characterized in that: The inner bottom surface of the sampling tank (1) is coaxially fixedly connected with a guide column (37), and the surface of the guide column (37) is provided with an upper straight groove (38), an inclined groove (39) and a lower straight groove (40) in sequence from top to bottom. The upper straight groove (38), the inclined groove (39) and the lower straight groove (40) are connected through, and the steering seat (12) is slidably connected to the guide column (37) along the direction of the upper straight groove (38), the inclined groove (39) and the lower straight groove (40).

5. The crop pesticide residue sampling and detection device according to claim 2, characterized in that: A water retaining strip (17) is fixedly mounted on the inner bottom surface of the sampling tank (1), and the water retaining strip (17) is separated between the liquid outlet (6) and the circular hole (7); The sampling tank (1) has nozzles (18) symmetrically fixed on both sides thereof, and a lower electric-driven lifting rod (19) is fixedly mounted on the inner wall of the sampling tank (1), the output end of the lower electric-driven lifting rod (19) is fixedly connected to a lifting frame (20), and the lifting frame (20) is fixedly connected to the mesh cover plate (11).

6. The crop pesticide residue sampling and detection device according to claim 5, characterized in that: The upper end of the sampling tank (1) is snap-fitted with a sealing cover (21), the inner top surface of the sealing cover (21) is coaxially rotatably connected to a rotating rod (22), a pressing block (23) is telescopically connected below the rotating rod (22), and a limit spring (24) is elastically connected between the pressing block (23) and the rotating rod (22); The outer sleeve of the rotating rod (22) is connected to a top plate (25), a plurality of upper electric-driven lifting rods (26) are fixed at equal angles on the lower surface of the top plate (25), a sampling column (27) is fixedly mounted on the outer shell of the upper electric-driven lifting rod (26), a push plate (28) is slidably mounted on the inner wall of the sampling column (27), and the push plate (28) is fixedly connected to the output end of the upper electric-driven lifting rod (26); Threaded rods (291) are rotatably mounted on both sides of the inner top surface of the sealing cover (21), and an internal threaded frame (292) is provided on the outer thread sleeve of the threaded rod (291), and the internal threaded frame (292) is fixedly connected to the top plate (25).

7. A method for using a sampling and detection device for pesticide residues in crops, using the sampling and detection device for pesticide residues in crops as claimed in claim 6, and the specific method steps are as follows: S1. Fix the sampled crops, place the crops in the sampling tank (1) to limit the sampling position and keep the sampling stable; S2, liquid sampling, spraying liquid onto the surface of crops through a nozzle (18), the liquid carrying pesticides on the surface of the crops, and introducing the liquid sample into the liquid sampling box (4) through the liquid outlet (6); S3, solid sampling, sampling different positions of the crop by pressing down the sampling column (27), and moving the push plate (28) to discharge the solid sample in the sampling column (27); S4, solid slicing, controlling the blade (30) to rotate, slicing the solid sample extruded from the sampling channel (15), and thinning the solid sample; S5, mobile detection, controlling the fixed sample and the liquid sample to move to the detector (2) through the mobile rack (3), and detecting and analyzing the pesticide residue ratio of the crops.

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