Portable rapid detection device for food pesticide residues

Abstract

The invention discloses a portable rapid detection device for pesticide residues in food, and relates to the technical field of food detection.The portable rapid detection device comprises a cylindrical shell with the two ends open; the injection cylinder is fixedly arranged in the cylinder shell, and the injection cylinder is filled with eluent; one end of the instillation needle tube is communicated with the outer wall of the lower end of the syringe; the buckling cover is buckled and connected to an opening in the lower end of the barrel shell; the rubbing assembly is arranged at the opening in the upper end of the barrel shell. According to the portable rapid detection device for food pesticide residues, the syringe, the instillation needle tube, the rubbing assembly and the test paper assembly are coaxially integrated through a thin-wall circular tube structure with openings in the two ends of the barrel shell, an elution-rubbing-reaction integrated optical axis layout is formed, the whole device is in a pen shape, and the device can be held by one hand and put into a pocket; the defects that a traditional table-type instrument is scattered and heavy are thoroughly overcome, and real outdoor portability is achieved.

Description

Technical Field

[0001] This invention relates to the field of food testing technology, and in particular to a portable rapid detection device for pesticide residues in food. Background Technology

[0002] Food pesticide residue detection refers to the entire process of qualitatively or quantitatively determining the active ingredients of various pesticides, such as organophosphates, carbamates, and pyrethroids, that may adhere to the surface and interior of agricultural products during the planting, distribution, or consumption stages, using techniques such as chemical analysis, biosensing, immunoassay, or enzyme inhibition. Its purpose is to obtain data on the residual concentration of pesticides and their toxic metabolites or degradation products in food through steps such as sampling, extraction, purification, concentration, separation, identification, and result determination. This allows for the assessment of whether the food meets national limits, whether it poses an acute or chronic risk to consumer health, and provides a scientific basis for regulatory enforcement, production guidance, origin traceability, market access, and consumer warnings. Ultimately, this ensures food safety, protects public health, promotes green agricultural production, and facilitates smooth international trade.

[0003] Currently, the detection of pesticide residues in food mainly relies on specialized analytical instruments in laboratories, such as large-scale equipment like gas chromatographs, liquid chromatographs, and mass spectrometers. While these instruments offer high accuracy and reliable results, they generally suffer from problems such as large size, complex structure, cumbersome operation, long testing cycles, and high professional requirements for operators. Furthermore, they require the use of various reagents, standards, and sample pretreatment tools, resulting in numerous steps and a lengthy testing process, making it difficult to meet the needs of rapid on-site screening. Especially in non-laboratory environments such as outdoors or in fields, testing personnel often need to conduct immediate monitoring of randomly selected agricultural products. However, existing testing instruments lack portability and cannot be carried around, making practical use extremely inconvenient and severely restricting the flexibility and timeliness of pesticide residue monitoring. Therefore, improvements to existing technologies are necessary. Summary of the Invention

[0004] The purpose of this invention is to provide a portable rapid detection device for pesticide residues in food, in order to solve the problem mentioned in the background art that the current detection of pesticide residues in food mainly relies on professional analytical instruments in the laboratory, which have problems such as large size, complex structure and cumbersome operation, and therefore cannot meet the needs of rapid on-site screening.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A portable rapid detection device for pesticide residues in food, comprising:

[0007] The cylindrical shell has openings at both ends;

[0008] An injection cartridge is fixedly disposed inside a casing, and the injection cartridge is filled with an eluent.

[0009] An infusion syringe, one end of which is connected to the lower outer wall of the syringe;

[0010] The snap-on cover is snapped onto the opening at the lower end of the cylindrical shell;

[0011] A kneading component is provided at the opening at the upper end of the cylinder shell. After the eluent is dripped onto the food by the dripping needle, the kneading component is used to evenly apply the eluent to the surface of the food.

[0012] A test strip assembly, which is disposed inside the cylindrical shell, is used for reaction detection.

[0013] Preferably, a plurality of positioning rods are fixedly connected to the inner wall of the cylinder shell, and a positioning shell is fixedly connected to one end of each positioning rod. The outer wall of the injection cylinder is fixedly connected to the inner wall of the positioning shell.

[0014] Preferably, two vertical sliding grooves are symmetrically opened on the outer wall of the cylinder shell. An upper pressure plate and a lower pressure plate are slidably connected inside the vertical sliding grooves. The bottom wall of the upper pressure plate is fixedly connected to the upper wall of the injection cylinder pressing cap, and the upper wall of the lower pressure plate is fixedly connected to the bottom wall of the injection cylinder pressing cap.

[0015] Preferably, two seat plates are symmetrically fixedly connected to the outer wall of the cylinder shell, and the seat plates are located directly below the vertical sliding groove. An electric push rod is fixedly connected to the seat plate, and the output end of the electric push rod passes through the lower pressure plate and is fixedly connected to the upper pressure plate. A power supply and a controller are also fixedly connected to the outer wall of the cylinder shell.

[0016] Preferably, the kneading assembly includes a groove seat fixedly disposed at the upper opening of the cylinder shell, a lead screw threadedly connected to the internal cavity of the groove seat, and a silicone kneading hemisphere fixedly connected to the upper end of the lead screw.

[0017] Preferably, an iron ring is fixedly connected to the upper end of the groove seat, a protective cover is provided on the outside of the silicone kneading hemisphere, and a magnetic ring is fixedly connected to the bottom wall of the protective cover. The magnetic ring and the iron ring are connected by magnetic attraction.

[0018] Preferably, the infusion needle is U-shaped, and the test strip assembly is located on one side of the infusion needle.

[0019] Preferably, the test strip assembly includes a support rod fixedly disposed on the inner wall of the cylinder shell, a base plate fixedly connected to the upper end of the support rod, a rotating shaft rotatably connected to the base plate, two insert rods symmetrically fixedly connected to the outer wall of the rotating shaft, a test strip take-up roller inserted into the outside of the rotating shaft and the two insert rods, and several layers of test strips wound around the outer wall of the test strip take-up roller.

[0020] Preferably, the test strips are composed of multiple individual test strips connected by an easy-tear portion, and two tablets are fixedly connected to each individual test strip, and a film is provided on each individual test strip to cover the tablets.

[0021] Preferably, the outer wall of the cylindrical shell has an insertion window, and an arc-shaped plate is rotatably connected to one side of the insertion window. One end of the arc-shaped plate is fastened to the other side of the insertion window. The outer wall of the arc-shaped plate has a strip-shaped outlet, and two elastic clips are symmetrically fixedly connected to the inner wall of the strip-shaped outlet.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention integrates the syringe, drip needle, rubbing component and test strip component coaxially through a thin-walled cylindrical shell with openings at both ends, forming an integrated optical axis layout of "washing-rubbing-reaction". The device is pen-shaped, can be held with one hand and put into a pocket, completely getting rid of the defects of traditional desktop instruments that are scattered and bulky, and achieving true outdoor portability.

[0024] In this invention, when the eluent fully acts on the leaves of agricultural products, the operator further utilizes the rotating shaft connected to the base plate and the test paper winding rollers inserted into the rotating shaft and two insert rods to extract a single test paper and tear it using the designed easy-tear part. Then, the operator presses the area of ​​the agricultural product leaf that has been reacted with the eluent into contact with the white tablet, lets it stand for a few minutes, and then folds the single test paper in half and squeezes it for a few minutes to allow the white tablet to react with the red tablet. When the white area turns blue, it indicates that the cholinesterase activity is normal, i.e., there is no pesticide residue. When the white area does not turn blue, the enzyme is inhibited, i.e., there is pesticide residue. A blank control experiment is required for each batch using the eluent.

[0025] The present invention guides the upper and lower pressure plates into a purely linear motion pair through the vertical sliding groove. After the electric push rod is fixed to the cylinder shell through the seat plate, its output end directly drives the upper pressure plate, digitizing the pressing stroke of the injection cylinder cap. The controller can set the extension and speed of the push rod to achieve precise quantitative dripping of 100μL±5μL of eluent, replacing the uncertainty of manual injection and meeting the requirements of rapid on-site injection with traceable values.

[0026] After the test strip is used up, the staff can open the arc plate, take out the test strip take-up roller, and further wrap multiple layers of test strip on its outer wall. Then, the test strip take-up roller is inserted into the outside of the rotating shaft and two insert rods for limiting. Finally, a single test strip is led out and stuck between two elastic clips to prevent it from slipping out. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the overall external structure of a portable rapid detection device for pesticide residues in food.

[0028] Figure 2 This is a first-view structural schematic diagram of a portable rapid detection device for pesticide residues in food.

[0029] Figure 3 This is a schematic diagram of the internal structure of the casing of a portable rapid detection device for pesticide residues in food.

[0030] Figure 4 This is a schematic cross-sectional view of a portable rapid detection device for pesticide residues in food.

[0031] Figure 5 A schematic diagram of the test strip component of a portable rapid detection device for pesticide residues in food;

[0032] Figure 6 A portable rapid detection device for pesticide residues in food. Figure 2 Enlarged view of a portion of point A in the middle.

[0033] In the diagram: 1. Shell; 2. Injection cylinder; 3. Dropping needle; 4. Snap-on cap; 5. Positioning rod; 6. Positioning shell; 7. Vertical sliding groove; 8. Upper pressure plate; 9. Lower pressure plate; 10. Seat plate; 11. Electric push rod; 12. Power supply; 13. Controller; 14. Slot seat; 15. Lead screw; 16. Silicone kneading hemisphere; 17. Iron ring; 18. Protective cap; 19. Magnetic ring; 20. Support rod; 21. Seat plate; 22. Rotating shaft; 23. Insert rod; 24. Test paper take-up roller; 25. Single test paper; 26. Tablet; 27. Arc plate; 28. Strip outlet; 29. ​​Elastic clip; 30. Tear-off section. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1:

[0036] Please see Figures 1-6 As shown, the present invention is a portable rapid detection device for pesticide residues in food, comprising:

[0037] The cylindrical shell 1 has openings at both ends;

[0038] The syringe 2 is fixedly disposed inside the shell 1, and the syringe 2 is filled with eluent.

[0039] The drip syringe 3 has one end connected to the lower outer wall of the syringe 2;

[0040] The fastening cover 4 is fastened to the lower opening of the cylindrical shell 1;

[0041] A kneading component is provided at the opening at the upper end of the cylinder shell 1. After the eluent is dripped onto the food by the dripping needle 3, the kneading component is used to evenly apply the eluent to the surface of the food.

[0042] The test strip assembly is disposed inside the shell 1 and is used for reaction detection.

[0043] Specifically, by integrating the aforementioned components, the device can be easily carried.

[0044] As can be seen from the above, the cylindrical shell 1, with its thin-walled cylindrical tube structure open at both ends, coaxially integrates the syringe 2, the drip needle 3, the rubbing component, and the test strip component, forming an integrated optical axis layout of "washing-rubbing-reaction". This makes the device resemble a pen, which can be held in one hand and put into a pocket, completely eliminating the defects of traditional desktop instruments that are scattered and bulky, and achieving true outdoor portability.

[0045] Depend on Figure 3 It is known that, in order to facilitate fixing the syringe 2 inside the shell 1, a number of positioning rods 5 are fixedly connected to the inner wall of the shell 1, and a positioning shell 6 is fixedly connected to one end of each positioning rod 5. The outer wall of the syringe 2 is fixedly connected to the inner wall of the positioning shell 6.

[0046] Depend on Figures 1-2 It can be seen that two vertical sliding grooves 7 are symmetrically opened on the outer wall of the cylinder shell 1. An upper pressure plate 8 and a lower pressure plate 9 are slidably connected inside the vertical sliding grooves 7. The bottom wall of the upper pressure plate 8 is fixedly connected to the upper wall of the injection cylinder 2 pressing cover, and the upper wall of the lower pressure plate 9 is fixedly connected to the bottom wall of the injection cylinder 2 pressing cover.

[0047] Two seat plates 10 are symmetrically fixedly connected to the outer wall of the cylindrical shell 1, and the seat plates 10 are located directly below the vertical sliding groove opening 7. An electric push rod 11 is fixedly connected to the seat plate 10. The output end of the electric push rod 11 passes through the lower pressure plate 9 and is fixedly connected to the upper pressure plate 8. A power supply 12 and a controller 13 are also fixedly connected to the outer wall of the cylindrical shell 1.

[0048] As can be seen from the above, the vertical sliding groove 7 guides the upper pressure plate 8 and the lower pressure plate 9 into a purely linear motion pair. After the electric push rod 11 is fixed to the shell 1 through the seat plate 10, its output end directly drives the upper pressure plate 8, digitizing the pressing stroke of the injection cylinder 2. The controller 13 can set the extension and speed of the push rod to achieve precise quantitative dripping of 100μL±5μL of eluent, replacing the uncertainty of manual injection and meeting the requirements of rapid on-site but traceable values.

[0049] Specifically, the RS PRO 1774498 miniature DC electric actuator 11 can meet the requirements: this actuator has a nominal 12V power supply, a maximum stroke of 50 mm, an unloaded speed of 14.6 mm / s, a rated thrust of 500 N, a built-in limit switch, a closed length of only 175 mm, a diameter of 35 mm, a weight of approximately 280 g, IP54 dust and splash resistance, and can operate intermittently in environments ranging from -25 ℃ to +65 ℃; the power supply 12 uses a commercially available three-cell 18650 lithium polymer battery series pack (12 V 2600 mAh), output through a 5.5×2.1 mm DC socket, with a continuous discharge current of up to 3 A, built-in overcharge / over-discharge / short circuit protection board, and can be fully charged in 2 hours via a Type-C boost module; the controller 13 can directly use the existing dual-channel synchronous drive board "Actuonix LAC board (Linear ActuatorControl)". The board has been redesigned, using an STM32F103 as the main controller. It uses Hall sensors to collect the positions of the two push rods in real time and uses PID closed-loop adjustment of the PWM duty cycle to achieve synchronization of the two rods.

[0050] Depend on Figure 3 It is known that the kneading assembly includes a groove seat 14 fixedly disposed at the upper opening of the cylinder shell 1, a lead screw 15 is threadedly connected to the internal cavity of the groove seat 14, and a silicone kneading hemisphere 16 is fixedly connected to the upper end of the lead screw 15.

[0051] As can be seen from the above, when the staff drips the eluent onto the agricultural products, the cylinder shell 1 is further inverted. At this time, the rubbing component is set downwards. By holding the cylinder shell 1, the silicone rubbing hemisphere 16 is used to rub and wipe the eluent dripped on the food leaves, so that the eluent can fully act on the agricultural product leaves.

[0052] Furthermore, the use of the threaded connection between the internal cavity of the slot seat 14 and the lead screw 15 facilitates the disassembly and cleaning of the silicone kneading hemisphere 16 after use, making the structural design user-friendly.

[0053] Depend on Figures 2-3 It is known that an iron ring 17 is fixedly connected to the upper end of the groove seat 14, and a protective cover 18 is provided on the outside of the silicone kneading hemisphere 16. A magnetic ring 19 is fixedly connected to the bottom wall of the protective cover 18, and the magnetic ring 19 and the iron ring 17 are connected by magnetic attraction.

[0054] As can be seen from the above, the iron ring 17 and the magnetic ring 19 form a tool-free quick-release interface, and the protective cover 18 can instantly adhere and seal the rubbing head when not in use, avoiding dust and sweat contamination.

[0055] Depend on Figures 3-5 It can be seen that the drip needle 3 is U-shaped, and the test strip assembly is located on one side of the drip needle 3.

[0056] The test strip assembly includes a support rod 20 fixedly disposed on the inner wall of the cylindrical shell 1. A base plate 21 is fixedly connected to the upper end of the support rod 20. A rotating shaft 22 is rotatably connected to the base plate 21. Two insert rods 23 are symmetrically fixedly connected to the outer wall of the rotating shaft 22. A test strip take-up roller 24 is inserted into the outside of the rotating shaft 22 and the two insert rods 23. Several layers of test strips are wound around the outer wall of the test strip take-up roller 24.

[0057] The test strips consist of multiple individual test strips 25 connected by an easy-tear portion 30. Two tablets 26 are fixedly connected to each individual test strip 25, and a film is provided on each individual test strip 25 to cover the tablets 26.

[0058] The two tablets 26 consist of a white tablet 26 region and a red tablet 26 region, respectively. The white tablet 26 region is immobilized with cholinesterase substrate (indophenol acetate), and the red tablet 26 region is immobilized with cholinesterase.

[0059] The eluent used is RS-PR-100, a product of existing technology, and consists of: 10 mmol / L PBS + 0.2% Triton X-100 + 10% ethanol + 0.05% phenoxyethanol preservative, pH 7.5±0.1.

[0060] As can be seen from the above, specifically, when the eluent fully acts on the leaves of the agricultural product, the staff further utilizes the characteristics of the rotating shaft 22 connected to the base plate 21 and the characteristics of the test paper take-up roller 24 inserted outside the rotating shaft 22 and the two insert rods 23 to pull out the single test paper 25 and tear it open using the set easy-tear part 30. Then, the staff presses the area of ​​the agricultural product leaf that has been reacted with the eluent into contact with the white tablet 26, lets it stand for a few minutes, and then folds the single test paper 25 in half and pinches it for a few minutes so that the white tablet 26 comes into contact with the red tablet 26 and reacts. When the white area turns blue, it indicates that the cholinesterase activity is normal, that is, there is no pesticide residue. When the white area does not turn blue, the enzyme is inhibited, that is, there is pesticide residue. A blank control experiment needs to be performed with the eluent for each batch.

[0061] Example 2:

[0062] A portable rapid detection device for pesticide residues in food, comprising:

[0063] The cylindrical shell 1 has openings at both ends;

[0064] The syringe 2 is fixedly disposed inside the shell 1, and the syringe 2 is filled with eluent.

[0065] The drip syringe 3 has one end connected to the lower outer wall of the syringe 2;

[0066] The fastening cover 4 is fastened to the lower opening of the cylindrical shell 1;

[0067] A kneading component is provided at the opening at the upper end of the cylinder shell 1. After the eluent is dripped onto the food by the dripping needle 3, the kneading component is used to evenly apply the eluent to the surface of the food.

[0068] The test strip assembly is disposed inside the shell 1 and is used for reaction detection.

[0069] Depend on Figure 2 and Figure 6 It is known that an insertion window is provided on the outer wall of the cylindrical shell 1, and an arc plate 27 is rotatably connected to one side of the insertion window. One end of the arc plate 27 is fastened to the other side of the insertion window. A strip-shaped outlet 28 is provided on the outer wall of the arc plate 27, and two elastic clips 29 are symmetrically fixedly connected to the inner wall of the strip outlet 28.

[0070] As can be seen from the above, after the test strip is used up, the staff can open the arc plate 27, take out the test strip take-up roller 24, and further wrap multiple layers of test strip on its outer wall. Then, the test strip take-up roller 24 is inserted into the outside of the rotating shaft 22 and the two insert rods 23 for limiting. Finally, a single test strip 25 is led out and stuck between the two elastic clips 29 to prevent it from slipping off.

[0071] Example 3:

[0072] Please see Figures 1-6 As shown, a method of using a portable rapid detection device for pesticide residues in food includes...

[0073] S1. Pull out the latching cap 4, place the leaf of the agricultural product to be tested below the opening at the lower end of the cylinder shell 1, so that the outlet of the drip needle tube 3 is directly opposite the center of the leaf;

[0074] S2. Press and hold the button on the controller 13. The power supply 12 will synchronously drive the two electric push rods 11 to press down, so that the syringe 2 will quantitatively squeeze out 100μL of eluent and drop it onto the surface of the blade.

[0075] S3. Immediately invert the cylinder shell 1, remove the magnetic protective cover 18, expose the silicone kneading hemisphere 16, hold the cylinder shell 1 and gently knead it back and forth on the surface of the blade for 10 seconds to allow the eluent to fully extract the pesticide.

[0076] S4. Return the cylinder shell 1 to the center, pull out a single test paper 25 from the strip outlet 28, and tear it off along the easy-tear section 30;

[0077] S5. Remove the covering film, align the rubbed area of ​​the leaf with area 26 of the white tablet, press for 3 seconds and let stand for 2 minutes;

[0078] S6. Fold the test paper in half so that the red pill area 26 and the white pill area 26 are aligned, and place it in the folded pressing arm and squeeze for 3 minutes;

[0079] S7. Compare the colors through the observation window: if the white area turns blue, it is acceptable; if it does not turn blue, it is positive for pesticide residues.

[0080] S8. For the first sample of each batch, use the eluent instead of the leaf to repeat steps 1-7 as a blank control. After confirming the effectiveness of the system, continue to test the next sample.

[0081] S9. After testing, remove the silicone kneading hemisphere 16, clean it, dry it, and then reinstall it. Insert the protective cover 18 back in, and the device will return to its pen-shaped standby state.

[0082] The accompanying drawings of the embodiments disclosed in this invention only involve structures relevant to the embodiments disclosed in this invention. Other structures can be referred to with common designs. Unless otherwise specified, the same embodiment and different embodiments of this invention can be combined with each other.

[0083] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable rapid detection device for pesticide residues in food, characterized in that: include The cylindrical shell (1) has openings at both ends; The syringe (2) is fixedly installed inside the casing (1), and the syringe (2) is filled with eluent. The drip syringe (3) has one end connected to the lower outer wall of the syringe (2); The snap-fit ​​cover (4) is snapped into the opening at the lower end of the cylindrical shell (1); The kneading component is located at the upper opening of the cylinder shell (1). After the eluent is dripped onto the food by the dripping needle (3), the kneading component is used to evenly apply the eluent to the surface of the food. Test strip assembly, which is disposed inside the shell (1) and is used for reaction detection.

2. The portable rapid detection device for pesticide residues in food according to claim 1, characterized in that: The inner wall of the cylindrical shell (1) is fixedly connected with several positioning rods (5), and one end of the positioning rod (5) is fixedly connected with a positioning shell (6). The outer wall of the injection cylinder (2) is fixedly connected to the inner wall of the positioning shell (6).

3. A portable rapid detection device for pesticide residues in food according to claim 1, characterized in that: The outer wall of the cylinder shell (1) has two vertical sliding grooves (7) symmetrically opened. The upper pressure plate (8) and the lower pressure plate (9) are slidably connected inside the vertical sliding grooves (7). The bottom wall of the upper pressure plate (8) is fixedly connected to the upper wall of the injection cylinder (2) pressing cover, and the upper wall of the lower pressure plate (9) is fixedly connected to the bottom wall of the injection cylinder (2) pressing cover.

4. A portable rapid detection device for pesticide residues in food according to claim 3, characterized in that: Two seat plates (10) are symmetrically fixedly connected to the outer wall of the cylindrical shell (1), and the seat plates (10) are located directly below the vertical sliding groove (7). An electric push rod (11) is fixedly connected to the seat plate (10). The output end of the electric push rod (11) passes through the lower pressure plate (9) and is fixedly connected to the upper pressure plate (8). A power supply (12) and a controller (13) are also fixedly connected to the outer wall of the cylindrical shell (1).

5. A portable rapid detection device for pesticide residues in food according to claim 1, characterized in that: The kneading assembly includes a groove seat (14) fixedly disposed at the upper opening of the cylindrical shell (1), and a screw rod (15) is threadedly connected to the inner cavity of the groove seat (14). A silicone kneading hemisphere (16) is fixedly connected to the upper end of the screw rod (15).

6. A portable rapid detection device for pesticide residues in food according to claim 5, characterized in that: The upper end of the groove (14) is fixedly connected to an iron plate ring (17), and the outside of the silicone kneading hemisphere (16) is provided with a protective cover (18). The bottom wall of the protective cover (18) is fixedly connected to a magnetic ring (19), and the magnetic ring (19) and the iron plate ring (17) are connected by magnetic adsorption.

7. A portable rapid detection device for pesticide residues in food according to claim 1, characterized in that: The drip syringe (3) is U-shaped, and the test strip assembly is located on one side of the drip syringe (3).

8. A portable rapid detection device for pesticide residues in food according to claim 7, characterized in that: The test paper assembly includes a support rod (20) fixedly installed on the inner wall of the cylindrical shell (1). A base plate (21) is fixedly connected to the upper end of the support rod (20). A rotating shaft (22) is rotatably connected to the base plate (21). Two insert rods (23) are symmetrically fixedly connected to the outer wall of the rotating shaft (22). A test paper take-up roller (24) is inserted into the outside of the rotating shaft (22) and the two insert rods (23). Several layers of test paper are wound on the outer wall of the test paper take-up roller (24).

9. A portable rapid detection device for pesticide residues in food according to claim 8, characterized in that: The test strips consist of multiple individual test strips (25) connected by an easy-tear section (30). Two tablets (26) are fixedly connected to each individual test strip (25), and a film is provided on each individual test strip (25) to cover the tablets (26).

10. A portable rapid detection device for pesticide residues in food according to claim 9, characterized in that: The outer wall of the cylindrical shell (1) is provided with an insertion window. An arc plate (27) is rotatably connected to one side of the insertion window. One end of the arc plate (27) is fastened to the other side of the insertion window. A strip outlet (28) is provided on the outer wall of the arc plate (27). Two elastic clips (29) are symmetrically fixed to the inner wall of the strip outlet (28).

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