Rice surface pesticide residue detection device and use method

Abstract

The invention relates to the technical field of pesticide residue detection, in particular to a rice surface pesticide residue detection device and a use method, a pesticide residue detector base, a gas cylinder, a rubber tube, a sealing cover, an electric push rod and a driving block, and further comprises a gas guide tube, a rubber plug, a cuvette, a sealing block, an annular plate, a conduction mechanism and a driving mechanism, the gas-guide tube is arranged in the sealing cover and is connected with the sealing cover, and the rubber plug is arranged below the gas-guide tube and is connected with the cuvette in an inserting manner. Through conveying of inert gas, air in the cuvette can be completely discharged, so that an oxidation reaction between a sample solution and the air can be avoided, the cuvette can be driven to shake in the vertical direction by utilizing driving force generated in the conveying process of the inert gas, and the effect of automatically and uniformly shaking the sample solution in the cuvette is achieved; and the accuracy of a detection result is ensured while the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide residue detection, and in particular to a device for detecting pesticide residue on the surface of rice and a use method thereof. Background Art

[0002] Rice is a food obtained after the seeds of rice are processed, and it is also one of the most important staple foods in our daily life. Pesticides are needed to prevent and control pests and diseases during the rice planting process. According to the chemical composition, pesticides can be divided into organophosphorus pesticides, organochlorine pesticides, carbamate pesticides, pyrethroid pesticides and heterocyclic pesticides. During the rice planting process, if the amount of pesticides used is too large, it will cause pesticide residues on the surface of the finished rice. In order to ensure food safety and avoid the harm of residual pesticides to the human body when eating rice, it is necessary to sample and test the pesticides remaining on the surface of rice.

[0003] The pesticide residue detector is a device that can quickly and accurately detect whether a sample contains pesticide residues. Under certain conditions, organophosphorus and carbamate pesticides have an inhibitory effect on the normal function of cholinesterase, and the inhibition rate is positively correlated with the concentration of the pesticide. Under normal circumstances, the enzyme catalyzes the hydrolysis of neurotransmitters, and the hydrolysis products react with the color developer to produce a yellow substance. The change in absorbance at 412nm over time is measured by a spectrophotometer to calculate the inhibition rate. The inhibition rate can be used to determine whether the sample contains organophosphorus or amino acid methyl ester residues. It can achieve on-site rapid detection of organophosphorus and carbamate pesticide residues. However, organophosphorus pesticides will undergo oxidation reactions under air and light conditions. During the atmospheric oxidation process, organophosphorus pesticides interact with OH free radicals and NO3 free radicals, causing the disintegration of the molecular structure, oxidation reactions, and the breakage of the molecular chain, which reduces the concentration of the original residual organophosphorus pesticides, thereby affecting the accuracy of the test results. In view of the above problems, there are good solutions in the prior art. For example, in patent CN113624924B, high-concentration nitrogen is used to remove air before detection to prevent air from contacting the sample solution to be detected, thereby avoiding deviations in the detection results. However, the following problems still exist: when multiple sample solutions are detected at one time, each sample solution needs to be manually shaken and left to stand during the preparation of the organophosphorus pesticide sample solution. The entire operation process takes a long time, which affects the detection efficiency. In addition, the sample solution prepared first is exposed to air and light. When the remaining sample solution is prepared, the sample solution prepared first will undergo an oxidation reaction, which will lead to a decrease in the concentration of the organophosphorus pesticide, thereby affecting the accuracy of the detection results.

[0004] Therefore, in order to ensure the detection efficiency and accuracy of the detection results when detecting multiple sample solutions, a device for detecting pesticide residues on the surface of rice and a method for using the device are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a detection device for pesticide residues on rice surface and a method for using the same, which solves the problem that when preparing multiple sample solutions, the organophosphorus pesticide in the first prepared sample solution will undergo oxidation reaction under the action of air and light, thereby reducing the detection efficiency and the accuracy of the detection result. Through the delivery of inert gas, the air in the cuvette can be completely discharged, thereby avoiding the oxidation reaction between the sample solution and the air, and the driving force generated during the delivery of the inert gas can be used to drive the cuvette to shake in the vertical direction, so as to achieve the effect of automatically shaking the sample solution in the cuvette, thereby improving the detection efficiency and ensuring the accuracy of the detection result.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for detecting pesticide residues on the surface of rice, comprising a pesticide residue detector base, a gas cylinder, a rubber tube, a sealing cover, an electric push rod and a driving block, wherein the gas cylinder is arranged on the pesticide residue detector base, the lower end of the rubber tube is connected to the gas cylinder through a regulating valve, the upper end of the rubber tube is connected to the sealing cover, the sealing cover is arranged on the pesticide residue detector base, the electric push rod is arranged on one side of the pesticide residue detector base, the output end of the electric push rod is connected to the side wall of the sealing cover through the driving block, the electric push rod drives the sealing cover to move in the vertical direction, and also comprises an air guide tube, a rubber plug, a cuvette, a sealing block, an annular plate, a conduction mechanism and a driving mechanism, the air guide tube is arranged inside the sealing cover and connected to the sealing cover, the rubber plug is arranged It is placed below the air duct and plugged into the cuvette, the cuvette is arranged inside the detection channel of the pesticide residue detector base, the annular plate is fixedly arranged inside the air duct, the sealing block is arranged above the annular plate, the conducting mechanism is arranged outside the air duct, the vertical movement of the sealing cover includes two stages, when the sealing cover moves downward for the first stage, the cuvette is driven upward by the conducting mechanism and the sealing block is synchronously driven to separate from the annular plate, the driving mechanism is arranged inside the air duct, when the gas in the gas cylinder enters the air duct, the gas drives the cuvette to shake in the vertical direction through the driving mechanism, and when the sealing cover moves downward for the second stage, the electric push rod drives the sealing cover to fit with the top of the pesticide residue detector base.

[0008] It can be seen that there are many ways to drive the cuvette to shake in the vertical direction, including but not limited to using electric cylinders and motors to drive. Considering the actual working environment and energy consumption, this solution is adopted. In the process of delivering inert gas to the inside of the cuvette to reduce the impact of air on the sample solution, the kinetic energy generated during the gas flow and the driving mechanism can be used to automatically drive the cuvette to shake in the vertical direction, effectively reducing the energy consumption of the entire detection device. At the same time, the set conduction mechanism can be used. When the air duct moves downward with the sealing cover, the air duct can only be conducted when there is a cuvette below the air duct, that is, when fewer cuvettes are used, the waste of inert gas is effectively reduced.

[0009] Preferably, the conduction mechanism includes connecting rod 1, magnetic block 1, magnetic block 2 and T-rod, the air guide tube includes an upper tube and a lower tube, the upper end of connecting rod 1 is connected to the upper tube, the magnetic block 1 is fixedly sleeved with connecting rod 1, the magnetic block 2 is arranged on the side wall of the cuvette, a limiting hole is provided inside the magnetic block 2, the magnetic block 2 is matched with connecting rod 1 through the limiting hole, a bellows is connected between the upper tube and the lower tube, the T-rod is penetrated into the interior of the annular plate, the horizontal section of the T-rod is connected to the inner wall of the lower tube, the upper end of the vertical section of the T-rod is connected to the sealing block, a sealing mechanism is provided between the upper tube and the lower tube, and when the cuvette moves upward, the sealing mechanism drives the bottom of the lower tube to fit tightly with the top of the rubber plug.

[0010] It can be known that there are many ways to drive the upper tube and the lower tube to conduct. The most common way is to install a solenoid valve inside the upper tube or the lower tube, and realize the conduction inside the upper tube or the lower tube by manually controlling the solenoid valve. Considering that the number of cuvettes used in each detection is not necessarily equal, and the manual control is relatively cumbersome, this solution is adopted. When the sealing cover drives the upper tube to move downward for the first section, the magnetic block 1 will move upward by magnetically adsorbing the magnetic block 2, and then can drive the cuvette to move upward. When the cuvette moves upward, it will drive the sealing block to move upward through the connection between the T rod and the sealing block, so that the bottom of the sealing block is separated from the annular plate, and the gas flow channel inside the upper tube and the lower tube is automatically opened. When there is no cuvette under the upper tube, the sealing block inside it keeps a close fit with the annular plate, thereby preventing the inert gas inside the upper tube from flowing out, effectively reducing the waste of inert gas.

[0011] Preferably, the driving mechanism includes a hollow block, a rotating rod, a bearing seat, an impeller, a guide tube 1, a cam and a driving rod, the hollow block is arranged inside the upper tube, the rotating rod is rotatably plugged into the upper tube and the hollow block, the bearing seat is arranged on the outer wall of the upper tube, the end of the rotating rod is connected to the bearing seat through a sealing bearing, the impeller is arranged inside the hollow block and is sleeved with the rotating rod, an air inlet is provided on the upper side of the hollow block, the lower end of the guide tube 1 is arranged inside the air inlet, the upper end of the guide tube 1 is cooperated with the sealing cover, an air outlet is provided on the lower side of the hollow block, the cam is sleeved with the rotating rod, the upper end of the driving rod is in contact with the cam, and the lower end of the driving rod is connected to the side wall of the sealing block.

[0012] It can be seen that there are many ways to drive the cuvette to shake in the vertical direction. The commonly used method is to drive the cuvette to move back and forth by an electric cylinder. Considering the situation that the sample solutions inside multiple cuvettes are detected simultaneously, and the multiple cuvettes are independently arranged, it is necessary to install a corresponding number of electric cylinders according to the number of cuvettes. Considering the actual installation space and installation cost, this solution is adopted. After the sealing block is separated from the annular plate, the kinetic energy generated by the inert gas during the flow process can automatically drive the corresponding cuvette to shake in the vertical direction, thereby automatically shaking the sample solution in the cuvette.

[0013] Preferably, the diameter of the air outlet is larger than the diameter of the air inlet, the upper end of the sealing block is arranged in a cone shape, and the sealing block is arranged directly below the air outlet.

[0014] By adopting the above scheme, on the one hand, the flow rate of the inert gas can be reduced when the inert gas flows out from the gas outlet, thereby avoiding the situation where bubbles appear in the sample solution in the cuvette due to the excessively fast flow rate of the inert gas; on the other hand, the blocking effect of the sealing block can be reduced during the flow of the inert gas, thereby ensuring the rapid flow of the inert gas inside the hollow block, thereby driving the impeller to rotate rapidly.

[0015] Preferably, the guide tube 1 includes an upper section, a middle section and a lower section, the tube diameter of the upper section is larger than the tube diameter of the lower section, the middle section is arranged in a truncated cone shape, and the tube diameter of the upper end of the middle section is larger than the tube diameter of the lower end.

[0016] By adopting the above solution, the inert gas will produce an acceleration effect after passing through the inside of the guide tube 1, so that it can drive the impeller to rotate quickly when blowing onto the impeller surface, thereby achieving normal driving of the cam.

[0017] Preferably, the sealing mechanism includes connecting block one, connecting block two and an elastic telescopic rod, wherein connecting block one is fixedly sleeved on the lower end outer wall of the upper tube, connecting block two is fixedly sleeved on the upper end outer wall of the lower tube, and both ends of the elastic telescopic rod are respectively connected to connecting block one and connecting block two, and the sum of the elastic force of the elastic telescopic rod, the rubber plug and the gravity of the cuvette is less than the magnetic force between magnetic block one and magnetic block two.

[0018] It can be seen that the inert gas needs to enter the interior of the cuvette after being blown out from the lower end of the lower tube, so as to exhaust the air inside the cuvette, so this solution is adopted. Through the elastic force of the elastic telescopic rod, the bottom of the lower tube can be fitted with the top of the rubber plug, so as to ensure the sealing effect of the contact position between the lower tube and the rubber plug and avoid leakage of the inert gas.

[0019] Preferably, a chamber is opened on the upper part of the sealing cover, the upper end of the rubber tube passes through the interior of the chamber, the upper end of the upper tube is connected to the sealing cover, and the upper end of the guide tube 1 passes through the interior of the chamber.

[0020] By adopting the above scheme, multiple guide tubes share one chamber. After the inert gas enters the chamber through the rubber tube, it can enter the interior of the corresponding guide tube one respectively. When the interior of the upper tube and the lower tube are connected, the inert gas can flow smoothly without the need to manually control the gas flow inside each upper tube and the lower tube individually.

[0021] Preferably, the rubber plug includes a rubber plug and a second guide tube, the rubber plug is plugged into the cuvette, the second guide tube is plugged into the rubber plug, the second guide tube is plugged into the interior of the lower tube, a plurality of air vents are provided inside the rubber plug, the aperture of the air vents is smaller than the aperture of the second guide tube, and the caliber of the second guide tube is smaller than the caliber of the cuvette.

[0022] By adopting the above scheme, after the inert gas enters the cuvette, it can utilize the density difference and the irregular movement of gas molecules to discharge the remaining air in the cuvette through the air outlet, so that the inert gas can be completely filled above the sample solution, avoiding the oxidation reaction between the sample solution and the air during the detection process, and effectively ensuring the accuracy of the test results.

[0023] Preferably, a second connecting rod is provided at the bottom of the rubber plug, a baffle is provided at the lower end of the second connecting rod, the bottom of the baffle is provided in a rectangular shape, and the top of the baffle is provided in a regular quadrangular pyramid shape.

[0024] By adopting the above scheme, when the inert gas enters the cuvette, the baffle can be used to block the inert gas, thereby preventing the inert gas from directly blowing onto the surface of the sample solution and causing bubbles to be generated in the sample solution. At the same time, the inert gas can be dispersed so that the inert gas can flow in multiple directions, further preventing the generation of bubbles in the sample solution.

[0025] A method for using any of the above-mentioned devices for detecting pesticide residues on rice surface comprises the following steps:

[0026] S1. Prepare the sample solution, pour the prepared sample solution into the cuvette, install the rubber plug on the upper end of the cuvette, insert the cuvette into the corresponding detection channel in the base of the pesticide residue detector to reduce the influence of air and light on the sample solution, start the electric push rod, the output end of the electric push rod drives the driving block to move downward for the first stage, the driving block drives the sealing cover to move downward during the downward movement, and the sealing cover drives the upper tube to move downward during the downward movement. Since the side wall of the upper tube is connected with the connecting rod 1, and the connecting rod 1 and the magnetic block 1 are fixedly sleeved, the upper tube can drive the connecting rod 1 and the magnetic block 1 when it moves downward. At this time, the magnetic block 2 moves upward through the magnetic force of the magnetic block 1, so that the lower end of the cuvette is in a suspended state. At this time, the upper end of the driving rod is in contact with the side wall of the cam, and the sealing block is in a separated state from the annular plate. Under the reaction force of the elastic telescopic rod, the lower end of the lower tube maintains a sealed contact state with the rubber plug;

[0027] S2. Since the sum of the elastic force of the elastic telescopic rod, the rubber plug and the gravity of the cuvette is less than the magnetic force between the magnetic block 1 and the magnetic block 2, the bottom of the sealing block and the upper surface of the annular plate are separated at this time, the regulating valve of the gas cylinder is opened, and the inert gas inside the gas cylinder is transported to each guide tube 1 through the rubber tube. The inert gas inside the guide tube 1 flows through the upper tube, the bellows and the lower tube, and finally enters the inside of the cuvette, and the air in the cuvette is discharged through the air outlet, further reducing the air inside the cuvette;

[0028] S3. When the inert gas enters the hollow block through the guide tube 1, it can drive the impeller to rotate, and the rotating rod can be driven to rotate during the rotation of the impeller, and the cam can be driven to rotate during the rotation of the rotating rod. When the proximal end of the cam rotates to the bottom, the elastic force of the elastic telescopic rod can be used to pull the connecting block 2 to move upward. Since there is a magnetic force between the magnetic block 1 and the magnetic block 2, the cuvette can be moved upward during the upward movement of the connecting block 2, and the lower end of the lower tube is kept in close contact with the top of the rubber plug. Therefore, during the rotation of the cam, the cuvette can be driven to shake up and down, thereby shaking the sample solution inside the cuvette evenly.

[0029] S4. Start the electric push rod. The output end of the electric push rod drives the driving block to move downward for the second stage. The driving block drives the bottom of the sealing cover to contact with the top of the pesticide residue detector base, thereby achieving the sealing of multiple cuvettes. At this time, the bottom of each cuvette is in contact with the bottom of the corresponding detection channel. At this time, start the pesticide residue detector base to carry out detection.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Through the cooperation between the rubber plug and the cuvette, when the rubber plug is connected to the cuvette, part of the air in the cuvette can be discharged through the air outlet, thereby preliminarily avoiding the oxidation reaction between the sample solution and the air. After a plurality of cuvettes to be tested are respectively inserted into the detection channels corresponding to the base of the pesticide residue detector, the cuvette can be driven to shake in the vertical direction during the flow of the inert gas through the provided conduction mechanism and the driving mechanism, thereby achieving automatic shaking of the sample solution. In the process of the inert gas entering the cuvette, the air in the cuvette can be completely discharged, thereby ensuring the accuracy of the test results while improving the detection efficiency.

[0032] 2. Through the magnetic force between the set magnetic block 1 and the magnetic block 2, after the sealing cover moves downward for the first time, the magnetic block 2 will move upward through the magnetic force between the magnetic block 1, and the magnetic block 2 can drive the cuvette to move upward during the upward movement. At this time, the lower end of the cuvette is in a suspended state. Under the elastic force of the elastic telescopic rod, the rubber plug at the upper end of the cuvette and the corresponding lower tube are in a plug-in state, and the contact position between the top of the rubber plug and the lower tube will remain tightly fitted due to the elastic force of the elastic telescopic rod, thereby avoiding air leakage at the connection between the rubber plug and the lower tube, so that the inert gas in the guide tube 1 can completely enter the interior of the cuvette, so as to discharge the air in the cuvette, thereby ensuring the detection efficiency.

[0033] 3. Through the coordinated use of the impeller, cam and driving rod, the impeller can be driven to rotate when the inert gas enters the hollow block. During the rotation of the impeller, the cam can be driven to rotate through the connection between the rotating rod and the cam. The cam can squeeze the driving rod during the rotation. Since the lower end of the driving rod is connected to the sealing block, the driving rod can drive the sealing block to move when it moves. Through the connection between the T-rod, the sealing block and the lower tube, the sealing block can drive the lower tube to move during the movement. Since there is a magnetic force between the first magnetic block and the second magnetic block, and the magnetic force is greater than the elastic elongation The elastic force of the retractable rod, the rubber plug and the gravity of the cuvette are combined. When the lower tube moves downward, it can squeeze the rubber plug and drive the cuvette to move downward. When the lower tube moves upward, the magnetic block 2 will drive the cuvette to move upward under the action of the magnetic force. Therefore, during the flow of inert gas, under the action of the magnetic force of the magnetic blocks 1 and 2 and the elastic force of the elastic telescopic rod, the cuvette can be driven to shake continuously in the vertical direction during the continuous rotation of the cam, thereby shaking the sample solutions inside multiple cuvettes evenly at the same time, effectively improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a schematic diagram of the partial cross-sectional connection structure of the cuvette and the air guide tube in the present invention;

[0036] Figure 3 It is a schematic diagram of the cross-sectional connection structure between the air guide tube and the driving mechanism in the present invention;

[0037] Figure 4 It is a schematic diagram of the cross-sectional connection structure of the hollow block, the rotating rod and the impeller in the present invention;

[0038] Figure 5 It is a structural schematic diagram of the guide tube 1 in the present invention;

[0039] Figure 6 It is a schematic diagram of the connection structure of the cuvette, the air guide tube and the blocking mechanism in the present invention;

[0040] Figure 7 It is a schematic diagram of the structure of the rubber plug in the present invention;

[0041] Figure 8 It is a schematic diagram of the connection structure between the rubber tube and the sealing cover, the upper tube and the guide tube 1 in the present invention.

[0042] In the figure:

[0043] 1. Pesticide residue detector base;

[0044] 2. Gas cylinders;

[0045] 3. Rubber hose;

[0046] 4. Sealing cover; 41. Chamber;

[0047] 5. Electric push rod;

[0048] 6. Driver block;

[0049] 7. air guide tube; 71. upper tube; 72. lower tube; 73. bellows;

[0050] 8. Rubber plug; 81. Rubber plug; 811. Connecting rod 2; 812. Baffle; 82. Guide pipe 2; 83. Air outlet;

[0051] 9. Cuvette;

[0052] 10. Sealing block;

[0053] 11. Annular plate;

[0054] 12. conduction mechanism; 121. connecting rod 1; 122. magnetic block 1; 123. magnetic block 2; 1231. limiting hole; 124. T rod;

[0055] 13. driving mechanism; 131. hollow block; 1311. air inlet; 1312. air outlet; 132. rotating rod; 133. bearing seat; 134. impeller; 135. guide pipe 1; 1351. upper section; 1352. middle section; 1353. lower section; 136. cam; 137. driving rod;

[0056] 14. Sealing mechanism; 141. Connecting block 1; 142. Connecting block 2; 143. Elastic telescopic rod. DETAILED DESCRIPTION

[0057] 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.

[0058] See also Figures 1 to 8 The present invention provides a device for detecting pesticide residues on rice surface and a method for using the device. The technical scheme is as follows:

[0059] For details, please refer to Figure 1 and Figure 2A device for detecting pesticide residues on the surface of rice, comprising a pesticide residue detector base 1, a gas cylinder 2, a rubber tube 3, a sealing cover 4, an electric push rod 5 and a driving block 6, wherein the gas cylinder 2 is arranged on the pesticide residue detector base 1, the lower end of the rubber tube 3 is connected to the gas cylinder 2 through a regulating valve, the upper end of the rubber tube 3 is connected to the sealing cover 4, the electric push rod 5 is arranged on one side of the pesticide residue detector base 1, the output end of the electric push rod 5 is connected to the side wall of the sealing cover 4 through the driving block 6, the sealing cover 4 is arranged on the pesticide residue detector base 1, the electric push rod 5 drives the sealing cover 4 to move in the vertical direction, and also comprises an air guide tube 7, a rubber plug 8, a cuvette 9, a sealing The sealing block 10, the annular plate 11, the conducting mechanism 12 and the driving mechanism 13, the air duct 7 is arranged inside the sealing cover 4 and connected to the sealing cover 4, the rubber plug 8 is arranged below the air duct 7 and plugged with the cuvette 9, the cuvette 9 is arranged inside the detection channel of the pesticide residue detector base 1, the annular plate 11 is fixedly arranged inside the air duct 7, the sealing block 10 is arranged above the annular plate 11, before the sample solution is detected, the sealing cover 4 and the pesticide residue detector base 1 are in a separated state, when detection is required, the electric push rod 5 is started, and the electric push rod 5 is driven through two stages of displacement to make the bottom of the sealing cover 4 fit with the pesticide residue detector base 1.

[0060] After the electric push rod 5 drives the sealing cover 4 to move downward for the first stage, the driving of the electric push rod 5 is stopped. During the process of the sealing cover 4 moving downward for the first stage, the second magnetic block 123 will move upward through the magnetic force between it and the first magnetic block 122. Since the second magnetic block 123 is connected to the side wall of the cuvette 9, during the process of the second magnetic block 123 moving upward, the cuvette 9 can be driven to move upward, so that the lower end of the cuvette 9 is in a suspended state, and at this time, the connecting rod and the limiting hole 1231 are in a plug-in state. During the process of the cuvette 9 moving upward, the rubber plug 8 at the upper end of the cuvette 9 will squeeze the lower tube 72 to move upward, and during the process of the lower tube 72 moving upward, the T-rod 124 will be driven to move upward. Since the upper end of the T-rod 124 is connected to the sealing block 10, the T-rod 124 will drive the sealing block 10 to separate from the annular plate 11 when moving upward, thereby opening the gas flow channel inside the upper tube 71, and at this time, the inert gas above the sealing block 10 can flow normally.

[0061] As an embodiment of the present invention, refer to Figure 2 and Figure 3The conduction mechanism 12 is arranged outside the air guide tube 7. The movement of the sealing cover 4 in the vertical direction includes two stages. The conduction mechanism 12 includes a connecting rod 121, a magnetic block 122, a magnetic block 123 and a T rod 124. The air guide tube 7 includes an upper tube 71 and a lower tube 72. The upper end of the connecting rod 121 is connected to the upper tube 71. The magnetic block 122 is fixedly sleeved with the connecting rod 121. The magnetic block 123 is arranged on the side wall of the cuvette 9. A limiting hole 1231 is provided inside the magnetic block 123. The magnetic block 123 is connected to the connecting rod 121 through a limiting hole 1231, a bellows 73 is connected between the upper tube 71 and the lower tube 72, the T rod 124 is passed through the inside of the annular plate 11, the horizontal section of the T rod 124 is connected to the inner wall of the lower tube 72, the upper end of the vertical section of the T rod 124 is connected to the sealing block 10, and a sealing mechanism 14 is provided between the upper tube 71 and the lower tube 72. When the cuvette 9 moves upward, the sealing mechanism 14 drives the bottom of the lower tube 72 to fit tightly with the top of the rubber plug 8.

[0062] When the first downward displacement of the sealing cover 4 is completed, the second magnetic block 123 will move upward through the magnetic force between it and the first magnetic block 122. Since the second magnetic block 123 is connected to the cuvette 9, the cuvette 9 can move upward through the action of the second magnetic block 123, and the rubber plug 8 at the upper end of the cuvette 9 will squeeze the lower tube 72 to move upward. Since the horizontal section of the T-rod 124 is arranged inside the lower tube 72 and connected to the lower tube 72, the T-rod 124 will move upward with the lower tube 72, and the upper end of the T-rod 124 is connected to the sealing block 10. Therefore, the T-rod 124 can drive the sealing block 10 to separate from the annular plate 11 during the upward movement, thereby automatically opening the inert gas flow path inside the upper tube 71, so that the inert gas can be smoothly transported to the cuvette 9. Argon can be used as the inert gas. Since its density is greater than that of air, it can completely discharge the remaining air in the cuvette 9 after entering the cuvette 9.

[0063] As an embodiment of the present invention, refer to Figure 2 and Figure 3The driving mechanism 13 is arranged inside the air guide tube 7. When the gas in the gas cylinder 2 enters the air guide tube 7, the driving mechanism 13 drives the cuvette 9 to shake in the vertical direction. The driving mechanism 13 includes a hollow block 131, a rotating rod 132, a bearing seat 133, an impeller 134, a guide tube 135, a cam 136 and a driving rod 137. The hollow block 131 is arranged inside the upper tube 71. The rotating rod 132 is rotatably plugged with the upper tube 71 and the hollow block 131. The bearing seat 133 is arranged on the outer wall of the upper tube 71. The end of the rotating rod 132 is sealed by The sealing bearing is connected to the bearing seat 133, the impeller 134 is arranged inside the hollow block 131 and is sleeved with the rotating rod 132, the upper side of the hollow block 131 is provided with an air inlet 1311, the lower end of the guide tube 135 is arranged inside the air inlet 1311, the upper end of the guide tube 135 is cooperated and connected with the sealing cover 4, the lower side of the hollow block 131 is provided with an air outlet 1312, the cam 136 is sleeved with the rotating rod 132, the upper end of the driving rod 137 is in contact with the cam 136, and the lower end of the driving rod 137 is connected to the side wall of the sealing block 10.

[0064] When the inert gas enters the hollow block 131 through the guide tube 135, since the impeller 134 is arranged below the air inlet 1311 and is fixedly connected to the rotating rod 132, the airflow of the inert gas will drive the impeller 134 to drive the rotating rod 132 to rotate, and the cam 136 arranged on the rod wall of the rotating rod 132 can rotate with the rotating rod 132. During the rotation of the cam 136, since the positions of the proximal end and the central end of the cam 136 are constantly changed, the driving rod 137 can be continuously squeezed. Since the lower end of the driving rod 137 is connected to the sealing block 10, the sealing block 10 can be driven to move downward, thereby The lower tube 72 can be driven to move downward under the action of the T-rod 124. Since the bottom of the lower tube 72 is in contact with the rubber plug 8, the lower tube 72 will drive the rubber plug 8 and the cuvette 9 to move downward during the downward movement. Since the magnetic block 122 and the magnetic block 2 123 are not in contact and there is a magnetic force, the cuvette 9 will move upward again during the upward movement of the bottom of the distal end of the cam 136. Therefore, the corresponding cuvette 9 can be driven to continuously shake in the vertical direction during the flow of the inert gas, and the sample solution in the cuvette 9 can be automatically shaken, thereby effectively saving the detection time.

[0065] As an embodiment of the present invention, referring to FIG. Figure 2 , Figure 3 and Figure 4The guide pipe 135 includes an upper section 1351, a middle section 1352 and a lower section 1353. The diameter of the upper section 1351 is larger than the diameter of the lower section 1353. The middle section 1352 is arranged in a truncated cone shape. The diameter of the upper end of the middle section 1352 is larger than the diameter of the lower end. After the inert gas passes through the inside of the guide pipe 135, it will produce an acceleration effect, so that when it blows toward the surface of the impeller 134, it can drive the impeller 134 to rotate quickly, thereby realizing the normal driving of the cam 136. The diameter of the gas outlet 1312 is larger than that of the inlet. The aperture of the air port 1311, the upper end of the sealing block 10 is set in a cone shape, and the sealing block 10 is set directly below the air outlet 1312. On the one hand, when the inert gas flows out from the air outlet 1312, the flow rate of the inert gas can be reduced to avoid bubbles in the sample solution in the cuvette 9 due to the excessively fast flow rate of the inert gas; on the other hand, the blocking effect of the sealing block 10 can be reduced during the flow of the inert gas, ensuring the rapid flow of the inert gas inside the hollow block 131, thereby driving the impeller 134 to rotate rapidly.

[0066] As an embodiment of the present invention, refer to Figure 2 and Figure 5 A blocking mechanism 14 is provided between the upper tube 71 and the lower tube 72. When the magnetic block 122 attracts the magnetic block 123 to drive the cuvette 9 to move upward, the bottom of the lower tube 72 is driven to fit tightly with the top of the rubber plug 8 through the blocking mechanism 14. The blocking mechanism 14 includes a connecting block 141, a connecting block 142 and an elastic telescopic rod 143. The connecting block 141 is fixedly sleeved on the outer wall of the lower end of the upper tube 71, and the connecting block 142 is fixedly sleeved on the outer wall of the upper end of the lower tube 72. The two ends of the elastic telescopic rod 143 are respectively connected to the connecting block 141 and the connecting block 2 142. The sum of the elastic force of the elastic telescopic rod 143 and the gravity of the rubber plug 8 and the cuvette 9 is less than the magnetic force between the magnetic block 122 and the magnetic block 2 123.

[0067] Under this setting, when the bottom of the cuvette 9 is suspended in the air, the elastic telescopic rod 143 is in a compressed state. At this time, the bottom of the lower tube 72 is tightly fitted with the top of the rubber plug 8, thereby ensuring the sealing effect between the lower tube 72 and the rubber plug 8. When the inert gas enters the cuvette 9 through the rubber plug 8, leakage of the inert gas can be avoided, so that the remaining air in the cuvette 9 can be quickly discharged, further avoiding the interference of air on the sample solution.

[0068] As an embodiment of the present invention, refer to Figure 7 A chamber 41 is opened at the upper part of the sealing cover 4, the upper end of the rubber tube 3 penetrates into the interior of the chamber 41, the upper end of the upper tube 71 is connected to the sealing cover 4, and the upper end of the guide tube 135 penetrates into the interior of the chamber 41.

[0069] Since each upper tube 71 is independently arranged, the number of rubber tubes 3 used can be reduced under this arrangement, and there is no need to connect the rubber tube 3 to the upper end of each upper tube 71. Since the rubber tube 3 is connected to the interior of the chamber 41, after the regulating valve of the gas cylinder 2 is opened, the inert gas inside the gas cylinder 2 will enter the interior of the chamber 41 through the rubber tube 3 and be retained. After the sealing block 10 inside any upper tube 71 is separated from the annular plate 11, the inert gas can flow freely, and when the sealing block 10 inside the upper tube 71 is in contact with the annular plate 11, the flow of inert gas can be avoided, so that when the sample solution inside a small number of cuvettes 9 is detected, the opening and closing of the corresponding internal channels of the upper tube 71 can be automatically controlled, effectively avoiding the waste of inert gas.

[0070] As an embodiment of the present invention, refer to Figure 8 The rubber plug 8 includes a rubber plug 81 and a second guide tube 82. The rubber plug 81 is plugged with the cuvette 9, and the second guide tube 82 is plugged with the rubber plug 81. The second guide tube 82 is plugged inside the lower tube 72. A plurality of air outlets 83 are provided inside the rubber plug 81. The aperture of the air outlet 83 is smaller than the aperture of the second guide tube 82. The aperture of the second guide tube 82 is smaller than the aperture of the cuvette 9. After the inert gas enters the cuvette 9, the density difference and the irregular movement of the gas molecules can be used to discharge the remaining air in the cuvette 9 through the air outlet 83, so that the inert gas can be completely filled above the sample solution, avoiding the inert gas from entering the cuvette 9 during the detection process. The sample solution undergoes an oxidation reaction with the air, which effectively ensures the accuracy of the test results. A connecting rod 811 is provided at the bottom of the rubber plug 81, and a baffle 812 is provided at the lower end of the connecting rod 811. The bottom of the baffle 812 is rectangular, and the top of the baffle 812 is a regular quadrangular pyramid. In the process of the inert gas entering the cuvette 9, the baffle 812 can be used to block the inert gas, thereby preventing the inert gas from directly blowing onto the surface of the sample solution and causing bubbles to be generated in the sample solution. At the same time, the inert gas can be dispersed so that the inert gas can flow in multiple directions, further preventing bubbles from being generated in the sample solution.

[0071] A method for using any of the above-mentioned rice surface pesticide residue detection devices comprises the following steps:

[0072] S1. Prepare the sample solution, pour the prepared sample solution into the cuvette 9, install the rubber plug 8 on the upper end of the cuvette 9, insert the cuvette 9 into the corresponding detection channel in the base 1 of the pesticide residue detector to reduce the influence of air and light on the sample solution, start the electric push rod 5, the output end of the electric push rod 5 drives the driving block 6 to move downward for the first section, the driving block 6 drives the sealing cover 4 to move downward in the process of moving downward, and drives the upper tube 71 to move downward in the process of moving downward, because the side wall of the upper tube 71 is connected with The connecting rod 121 is connected, and the connecting rod 121 and the magnetic block 122 are fixedly sleeved, so that when the upper tube 71 moves downward, the connecting rod 121 and the magnetic block 122 can be driven. At this time, the magnetic block 123 moves upward through the magnetic force of the magnetic block 122, so that the lower end of the cuvette 9 is in a suspended state. At this time, the upper end of the driving rod 137 contacts the side wall of the cam 136, and the sealing block 10 and the annular plate 11 are in a separated state. Under the reaction force of the elastic telescopic rod 143, the lower end of the lower tube 72 maintains a sealed contact state with the rubber plug 8;

[0073] S2. Since the sum of the elastic force of the elastic telescopic rod 143 and the gravity of the rubber plug 8 and the cuvette 9 is less than the magnetic force between the magnetic block 122 and the magnetic block 2 123, the bottom of the sealing block 10 and the upper surface of the annular plate 11 are in a separated state, the regulating valve of the gas cylinder 2 is opened, and the inert gas inside the gas cylinder 2 is transported to each guide tube 1 135 through the rubber tube 3. The inert gas inside the guide tube 1 135 flows through the upper tube 71, the bellows 73 and the lower tube 72, and finally enters the inside of the cuvette 9, and the air in the cuvette 9 is discharged through the air outlet 83, further reducing the air inside the cuvette 9;

[0074] S3. When the inert gas enters the hollow block 131 through the guide tube 135, it can drive the impeller 134 to rotate. During the rotation of the impeller 134, the rotating rod 132 is driven to rotate. During the rotation of the rotating rod 132, the cam 136 is driven to rotate. During the rotation of the proximal end of the cam 136 to the bottom, the elastic force of the elastic telescopic rod 143 can be used to pull the connecting block 2 142 to move upward. Due to the magnetic force between the magnetic block 122 and the magnetic block 2 123, during the upward movement of the connecting block 2 142, the cuvette 9 can be moved upward, and the lower end of the lower tube 72 is kept in close contact with the top of the rubber plug 8. Therefore, during the rotation of the cam 136, the cuvette 9 can be driven to shake up and down, thereby shaking the sample solution inside the cuvette 9 evenly.

[0075] S4. Start the electric push rod 5. The output end of the electric push rod 5 drives the driving block 6 to move downward for the second stage. The driving block 6 drives the bottom of the sealing cover 4 to contact with the top of the pesticide residue detector base 1, thereby realizing the sealing of multiple cuvettes 9. At this time, the bottom of each cuvette 9 is in contact with the bottom of the corresponding detection channel. At this time, start the pesticide residue detector base 1 to perform detection.

[0076] Working principle: Before the test, the sealing cover 4 is separated from the base 1 of the pesticide residue detector and is located at the top. When testing multiple sample solutions, the prepared sample solution is first transferred to the cuvette 9. After the rubber plug 8 is installed on the upper end of the cuvette 9, the cuvette 9 is inserted into the corresponding detection channel to reduce the influence of air and light on the sample solution. The electric push rod 5 is started, and the output end of the electric push rod 5 drives the sealing cover 4 to move downward for the first stage through the driving block 6. During the process of the sealing cover 4 completing the first stage of movement, the conductive component can drive the sealing cover 4 to move downward. The cuvette 9 is moved upward so that the bottom of the cuvette 9 is in a suspended state. At this time, the interior of the air duct 7 is in a conducting state. The regulating valve of the control gas cylinder 2 is opened, and the inert gas inside the gas cylinder 2 is transported to the interior of the corresponding air duct 7 through the guide tube 135, and will flow inside the air duct 7. During the flow of the inert gas, the cooperation of the driving mechanism 13 and the blocking mechanism 14 can drive the cuvette 9 to continuously shake in the vertical direction, thereby shaking the sample solution inside the cuvette 9 evenly, thereby improving the detection efficiency and the accuracy of the detection results.

[0077] Specific:

[0078] After all the cuvettes 9 are respectively inserted into the corresponding detection channels, the electric push rod 5 is started, and the output end of the electric push rod 5 drives the driving block 6 to move downward. The driving block 6 drives the sealing cover 4 to move downward during the downward movement. Since the top of the upper tube 71 is connected to the sealing cover 4, the sealing cover 4 can drive the upper tube 71 to move downward during the downward movement. The upper tube 71 can drive the magnetic block 122 to move downward through the connecting action of the connecting rod during the downward movement. Since the magnetic block 122 is fixedly sleeved with the connecting rod, at this time, the magnetic block 2 123 will move upward through the magnetic force between the magnetic block 122 and the magnetic block 122. Since the magnetic block 2 123 is fixedly arranged on the side wall of the cuvette 9, the magnetic block 2 123 can drive the cuvette 9 to move upward during the upward movement, so that the bottom of the cuvette 9 is in a suspended state. At this time, the lower tube 72 and the guide tube 2 82 are in a plug-in state, and the lower end of the lower tube 72 is in contact with the rubber plug 8.

[0079] Since the sum of the elastic force of the elastic telescopic rod 143 and the gravity of the rubber plug 8 and the cuvette 9 is less than the magnetic force between the magnetic block 122 and the magnetic block 2 123, the bottom of the sealing block 10 is separated from the upper surface of the annular plate 11, and the elastic telescopic rod 143 is in a compressed state. The regulating valve of the gas cylinder 2 is opened, and the inert gas inside the gas cylinder 2 is transported to the inside of each guide tube 1 135 through the rubber tube 3. Since the sealing block 10 and the annular plate 11 are in a separated state, the inert gas can pass through the upper tube 71, the bellows 73 and the lower tube 72 in sequence, and finally enter the inside of the cuvette 9, so that the air in the cuvette 9 is completely discharged through the air outlet 83;

[0080] When the inert gas enters the hollow block 131 through the guide tube 135, since the diameter of the lower section 1353 of the guide tube 135 is small, the speed of the inert gas will increase after it flows out from the lower end of the guide tube 135. After the inert gas is blown to the surface of the impeller 134, it can drive the impeller 134 to rotate. Since the cam 136 is connected to the impeller 134 through the rotating rod 132, the cam 136 can be driven to rotate through the rotating rod 132 during the rotation of the impeller 134. During the downward movement of the distal end of the cam 136, the cam 136 will squeeze the driving rod 137 to move downward. Since the lower end of the driving rod 137 is in contact with the sealing block 1 0, so during the downward movement of the driving rod 137, it can cooperate with the elastic force of the elastic telescopic rod 143, thereby driving the sealing block 10 to move downward. Since the protrusion is connected to the lower tube 72 through the T rod 124, and the bottom of the lower tube 72 is in contact with the rubber plug 8, the cuvette 9 can be driven to move downward; during the upward movement of the distal end of the cam 136, the magnetic force between the magnetic block 122 and the magnetic block 2 123 can re-drive the cuvette 9 to move upward, so that the cuvette 9 can be driven to shake continuously in the vertical direction during the flow of the inert gas, thereby shaking the sample solution inside the cuvette 9 evenly;

[0081] When a small number of cuvettes 9 are used, there may be a situation where there is no cuvette 9 under some of the air ducts 7. In this case, when the air duct 7 moves downward, the relative position of the magnetic block 122 and the lower tube 72 will not change. Therefore, the bottom of the sealing block 10 maintains contact with the top of the annular plate 11, thereby enabling the internal channel of the annular plate 11 to be blocked, preventing the inert gas from being discharged through the air duct 7, thereby effectively reducing the waste of the inert gas in the gas cylinder 2.

[0082] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rice surface pesticide residue detection device, comprising a pesticide residue detector base (1), a gas cylinder (2), a rubber tube (3), a sealing cover (4), an electric push rod (5) and a driving block (6), characterized in that: The apparatus further comprises an air guide tube (7), a rubber plug (8), a cuvette (9), a sealing block (10), an annular plate (11), a conduction mechanism (12) and a driving mechanism (13); the air guide tube (7) is arranged inside the sealing cover (4) and connected to the sealing cover (4); the rubber plug (8) is arranged below the air guide tube (7) and plugged into the cuvette (9); the cuvette (9) is arranged inside the detection channel of the base (1) of the pesticide residue detector; the annular plate (11) is fixedly arranged inside the air guide tube (7); the sealing block (10) is arranged above the annular plate (11); the conduction mechanism (12) is arranged on the air guide tube (7); The sealing cover (4) is arranged outside the air guide tube (7), and the movement of the sealing cover (4) in the vertical direction includes two stages. When the sealing cover (4) moves downward in the first stage, the cuvette (9) is driven to move upward through the conduction mechanism (12) and the sealing block (10) is driven to separate from the annular plate (11) simultaneously. The driving mechanism (13) is arranged inside the air guide tube (7). When the gas in the gas cylinder (2) enters the air guide tube (7), the gas drives the cuvette (9) to shake in the vertical direction through the driving mechanism (13). When the sealing cover (4) moves downward in the second stage, the electric push rod (5) drives the sealing cover (4) to fit with the top of the pesticide residue detector base (1).

2. A rice surface pesticide residue detection device according to claim 1, characterized in that: The conduction mechanism (12) comprises a connecting rod (121), a magnetic block (122), a magnetic block (123) and a T-bar (124); the air guide tube (7) comprises an upper tube (71) and a lower tube (72); the upper end of the connecting rod (121) is connected to the upper tube (71); the magnetic block (122) and the connecting rod (121) are fixedly sleeved; the magnetic block (123) is arranged on the side wall of the cuvette (9); a limiting hole (1231) is provided inside the magnetic block (123); the magnetic block (123) is connected to the connecting rod (71) through the limiting hole (1231); The upper tube (71) and the lower tube (72) are connected in a matching manner by a rod 1 (121); a bellows (73) is connected between the upper tube (71) and the lower tube (72); the T-rod (124) is passed through the interior of the annular plate (11); the horizontal section of the T-rod (124) is connected to the inner wall of the lower tube (72); the upper end of the vertical section of the T-rod (124) is connected to the sealing block (10); a sealing mechanism (14) is provided between the upper tube (71) and the lower tube (72); when the cuvette (9) moves upward, the sealing mechanism (14) drives the bottom of the lower tube (72) to fit tightly with the top of the rubber plug (8).

3. A rice surface pesticide residue detection device according to claim 2, characterized in that: The driving mechanism (13) comprises a hollow block (131), a rotating rod (132), a bearing seat (133), an impeller (134), a guide tube (135), a cam (136) and a driving rod (137); the hollow block (131) is arranged inside the upper tube (71); the rotating rod (132) is rotatably plugged with the upper tube (71) and the hollow block (131); the bearing seat (133) is arranged on the outer wall of the upper tube (71); the end of the rotating rod (132) is connected to the bearing seat (133) via a sealing bearing; the impeller (134) is arranged on the hollow block (131); The hollow block (131) is provided with an air inlet (1311) on the upper side thereof, the lower end of the guide tube (135) is arranged inside the air inlet (1311), the upper end of the guide tube (135) is cooperatively connected with the sealing cover (4), the lower side of the hollow block (131) is provided with an air outlet (1312), the cam (136) is sleeved with the rotating rod (132), the upper end of the driving rod (137) is in contact with the cam (136), and the lower end of the driving rod (137) is connected with the side wall of the sealing block (10).

4. A rice surface pesticide residue detection device according to claim 3, characterized in that: The diameter of the air outlet (1312) is larger than the diameter of the air inlet (1311); the upper end of the sealing block (10) is arranged in a conical shape; and the sealing block (10) is arranged directly below the air outlet (1312).

5. A rice surface pesticide residue detection device according to claim 3, characterized in that: The guide tube 1 (135) includes an upper section (1351), a middle section (1352) and a lower section (1353), the tube diameter of the upper section (1351) is larger than the tube diameter of the lower section (1353), the middle section (1352) is arranged in a truncated cone shape, and the tube diameter of the upper end of the middle section (1352) is larger than the tube diameter of the lower end.

6. A rice surface pesticide residue detection device according to claim 3, characterized in that: The blocking mechanism (14) comprises a connecting block 1 (141), a connecting block 2 (142) and an elastic telescopic rod (143); the connecting block 1 (141) is fixedly sleeved on the lower end outer wall of the upper tube (71); the connecting block 2 (142) is fixedly sleeved on the upper end outer wall of the lower tube (72); the two ends of the elastic telescopic rod (143) are respectively connected to the connecting block 1 (141) and the connecting block 2 (142); the sum of the elastic force of the elastic telescopic rod (143) and the gravity of the rubber plug (8) and the cuvette (9) is less than the magnetic force between the magnetic block 1 (122) and the magnetic block 2 (123).

7. A rice surface pesticide residue detection device according to claim 5, characterized in that: A chamber (41) is provided at the upper portion of the sealing cover (4), the upper end of the rubber tube (3) penetrates into the interior of the chamber (41), the upper end of the upper tube (71) is connected to the sealing cover (4), and the upper end of the guide tube (135) penetrates into the interior of the chamber (41).

8. A rice surface pesticide residue detection device according to claim 6, characterized in that: The rubber plug (8) comprises a rubber plug (81) and a second guide tube (82); the rubber plug (81) is plugged into the cuvette (9); the second guide tube (82) is plugged into the rubber plug (81); the second guide tube (82) is plugged into the interior of the lower tube (72); a plurality of air outlet holes (83) are provided inside the rubber plug (81); the aperture of the air outlet holes (83) is smaller than the aperture of the second guide tube (82); and the aperture of the second guide tube (82) is smaller than the aperture of the cuvette (9).

9. A rice surface pesticide residue detection device according to claim 8, characterized in that: A second connecting rod (811) is provided at the bottom of the rubber plug (81), and a baffle (812) is provided at the lower end of the second connecting rod (811). The bottom of the baffle (812) is arranged in a rectangular shape, and the top of the baffle (812) is arranged in a regular quadrangular pyramid shape.

10. A method for using the device for detecting pesticide residues on rice surface according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Pour the prepared sample solution into the cuvette (9), install the rubber plug (8) at the upper end of the cuvette (9), insert the cuvette (9) into the corresponding detection channel in the base (1) of the pesticide residue detector, start the electric push rod (5), and the output end of the electric push rod (5) drives the driving block (6) to move downward for the first stage. The driving block (6) drives the sealing cover (4) to move downward during the downward movement. The sealing cover (4) drives the upper tube (71) to move downward during the downward movement. The upper tube (71) drives the connecting rod 1 (121) and the magnetic block 1 (122) to move downward. The magnetic block 2 (123) drives the cuvette (9) to move upward until the lower end of the lower tube (72) fits with the rubber plug (8) through the magnetic force of the magnetic block 1 (122); S2. Open the regulating valve of the gas cylinder (2), and the inert gas inside the gas cylinder (2) is transported to each guide tube (135) through the rubber tube (3). The inert gas inside the guide tube (135) flows through the upper tube (71), the bellows (73) and the lower tube (72), and finally enters the inside of the cuvette (9), and the air in the cuvette (9) is discharged through the air outlet (83), thereby further reducing the air inside the cuvette (9); S3. The inert gas enters the hollow block (131) through the guide tube 1 (135) to drive the impeller (134) to rotate. The impeller (134) drives the rotating rod (132) to rotate during the rotation. The rotating rod (132) drives the cam (136) to rotate during the rotation. When the cam (136) rotates, it squeezes the driving rod (137). The driving rod (137) drives the cuvette (9) to move continuously in the vertical direction under the action of the magnetic force of the magnetic block 1 (122) and the magnetic block 2 (123) and the elastic force of the elastic telescopic rod (143); S4. Start the electric push rod (5), the output end of the electric push rod (5) drives the driving block (6) to move downward for the second stage, and the driving block (6) drives the bottom of the sealing cover (4) to contact the top of the pesticide residue detector base (1), thereby achieving the sealing of multiple cuvettes (9). At this time, the bottom of each cuvette (9) is in contact with the bottom of the corresponding detection channel. At this time, the pesticide residue detector base (1) can be started to perform detection.

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