A sampling device for detecting pesticide residues in rice

Abstract

This utility model belongs to the field of pesticide residue detection technology in rice, and particularly relates to a sampling device for pesticide residue detection in rice. It includes a base, a pesticide residue detector mounted on the top surface of the base, a stirring drum fixed to the base via support legs, a stirring assembly inside the stirring drum, a sampling tube connected to the side wall of the stirring drum, and a thin tube connected to the sampling tube. A slide is mounted on the top surface of the base, with a slider sliding on the slide. The slider has a clamping and positioning assembly for holding a cuvette, and a driving assembly for driving the slider to reciprocate and rotate the cuvette. This utility model can achieve uniform mixing of the extract and reagents, improving sampling accuracy and detection effect, reducing human error, and increasing detection efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of rice pesticide residue detection technology, and in particular relates to a rice pesticide residue detection sampling device. Background Technology

[0002] Rice is one of my country's main food crops, and its quality and safety are directly related to the health of consumers. Pesticide residue detection is a core step in ensuring rice quality and safety. Among these methods, the enzyme inhibition rate method has become the most commonly used rapid detection method by grassroots testing institutions due to its simplicity and speed. This method requires first mixing the rice sample with a buffer solution to extract the pesticide components from the sample, and then mixing the extract with enzymes, colorimetric reagents, and other reagents for colorimetric detection.

[0003] However, in actual testing, the efficiency and uniformity of the mixing process are poor. After adding the extract to the cuvette, it is necessary to fully mix the extract with the enzymes, colorimetric reagents and other reagents in the cuvette. In existing technologies, mixing is mostly achieved by manually shaking the cuvette, which is inefficient. Moreover, it is difficult to uniformize the force and time of manual shaking, and the uniformity of mixing cannot be guaranteed, which affects the accuracy of the test. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a sampling device for detecting pesticide residues in rice, which solves the problem of poor detection effect of existing pesticide residues in rice.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include: A sampling device for detecting pesticide residues in rice includes a base, a pesticide residue detector mounted on the top surface of the base, a stirring drum fixed to the top surface of the base via support legs, a stirring assembly inside the stirring drum, multiple sampling tubes of different heights connected to the side wall of the stirring drum, sampling valves installed on the sampling tubes, and thin tubes connected to the sampling tubes; a slide is slidably mounted on the top surface of the base, a slider is slidably mounted on the slide, a clamping and positioning assembly for holding a cuvette is mounted on the slider, and a driving assembly for driving the slider to reciprocate and rotate the cuvette.

[0006] Furthermore, the stirring assembly includes a main shaft rotatably disposed inside the stirring drum, a plurality of stirring blades fixedly disposed on the main shaft, a first servo motor fixedly disposed on the top surface of the stirring drum, and the output shaft of the first servo motor being fixedly connected to the upper end of the main shaft.

[0007] Furthermore, the mixing drum has a feed inlet on the top surface and a discharge outlet on the bottom, and a discharge valve is installed on the discharge outlet.

[0008] Furthermore, a first guide rail is fixedly provided on the top surface of the base, the slide is slidably mounted on the first guide rail, a servo cylinder is fixedly provided on the top surface of the base, and the piston rod of the servo cylinder is fixedly connected to the slide.

[0009] Furthermore, the drive assembly includes a second servo motor fixed on the slide, the output shaft of the second servo motor is fixed with a rotating arm, a movable rod is rotatably mounted on the rotating arm, and one end of the movable rod is hinged to the slider.

[0010] Furthermore, a second guide rail is fixedly provided on the top surface of the carriage, and the slider is slidably disposed on the second guide rail.

[0011] Furthermore, the clamping and positioning assembly includes a turntable disposed on the top surface of the slider. A limiting plate and a vertical plate are fixedly disposed on the top surface of the turntable. A contour groove matching the shape of the cuvette is provided on the limiting plate. A screw is internally threaded onto the vertical plate. A clamping plate for clamping the cuvette is rotatably disposed at one end of the screw, and a rotating handle is fixedly disposed at the other end. A rubber anti-slip pad is provided on the clamping plate.

[0012] Furthermore, the top surface of the slider is rotatably provided with a rotating shaft, the upper end of the rotating shaft is fixedly connected to the turntable, a gear is fixedly provided on the rotating shaft, a stand is fixedly provided on the top surface of the slide, and a rack that meshes with the gear is fixed on the stand.

[0013] The beneficial effects of this utility model are: 1. This utility model, by setting multiple sampling tubes at different heights on the side wall of the stirring tank, can sample the extract at different heights in the stirring tank, avoiding concentration deviation caused by sampling at a single location, effectively improving the representativeness and accuracy of the sampling, thereby enhancing the reliability of the test results, and solving the problem of insufficient representativeness of single-point sampling in the prior art. 2. By setting up a driving component, this utility model can drive the clamped cuvette to perform horizontal reciprocating motion and revolution at the same time, so that the extract and reagent can be quickly and uniformly mixed without manual shaking. This not only improves the mixing efficiency and can meet the needs of batch testing, but also ensures uniform mixing force and time, better uniformity, and effectively improves the accuracy of testing. 3. This utility model uses a servo cylinder to drive the slide to move, which can automatically move the cuvette to the bottom of different sampling tubes, realize automatic sample addition, eliminate the need for manual transfer of cuvettes and manual sample addition, reduce the error of manual operation, improve the overall efficiency of detection, and reduce the workload of detection personnel. Attached Figure Description

[0014] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ; Figure 2This is a three-dimensional illustration of the present invention. Figure 2 ; Figure 3 for Figure 1 A magnified structural diagram of part A in the middle; Figure 4 for Figure 2 A magnified structural diagram of part B.

[0015] In the diagram: 1. Base; 2. Support leg; 3. Discharge port; 4. Discharge valve; 5. Mixing drum; 6. Feed inlet; 7. First servo motor; 8. Sampling tube; 9. Sampling valve; 10. Thin tube; 11. Pesticide residue detector; 12. Mixing blade; 13. Main shaft; 14. Cuvette; 15. Limiting plate; 16. Contouring groove; 17. Clamping plate; 18. Vertical plate; 19. Screw; 20. Rotating handle; 21. Rack; 22. Frame; 23. Gear; 24. Rotating shaft; 25. First guide rail; 26. Servo cylinder; 27. Slider; 28. Second guide rail; 29. ​​Movable rod; 30. Rotating arm; 31. Second servo motor; 32. Carriage; 33. Turntable. Detailed Implementation

[0016] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1-4 As shown, this utility model provides a sampling device for detecting pesticide residues in rice, including a cuvette 14 and a base 1. A pesticide residue detector 11 is provided on the top surface of the base 1. Four support legs 2 are fixedly provided on the top surface of the base 1. The four support legs 2 are arranged in a rectangular shape and are fixedly provided at their upper ends. A stirring cylinder 5 is provided at the top end of the stirring cylinder 5. The stirring cylinder 5 is a cylindrical structure used to contain rice samples and buffer solutions. A main shaft 13 is rotatably provided on the top surface of the stirring cylinder 5. Multiple stirring blades 12 are fixedly provided on the main shaft 13. The multiple stirring blades 12 are evenly distributed along the axial direction of the main shaft 13, which can fully stir materials at different heights. A first servo motor 7 is fixedly provided on the top surface of the stirring cylinder 5. The output shaft of the first servo motor 7 is fixedly connected to the upper end of the main shaft 13 for driving the main shaft 13 to rotate.

[0018] The top surface of the mixing drum 5 is provided with a feed inlet 6 for adding rice samples and buffer solution. The feed inlet 6 is also provided with a sealing cap to prevent liquid from splashing out during the mixing process. The bottom of the mixing drum 5 is provided with a discharge port 3, and a discharge valve 4 is installed on the discharge port 3. After the test is completed, the discharge valve 4 can be opened to discharge the remaining material.

[0019] The outer wall of the stirring drum 5 is connected to three sampling tubes 8 at different heights, which can sample the extract at different heights to ensure the representativeness of the samples. Each sampling tube 8 is equipped with a sampling valve 9 to control the on / off of the sampling. The bottom of the sampling tube 8 is connected to a thin tube 10 with the outlet of the thin tube 10 facing downward and aligned with the inner wall of the cuvette 14 to prevent liquid from splashing out when adding the sample.

[0020] A first guide rail 25 is fixedly provided on the top surface of the base 1. The first guide rail 25 is arranged in the front-back direction. A slide 32 is slidably provided on the first guide rail 25. The slide 32 can slide along the first guide rail 25. A servo cylinder 26 is fixedly provided on the top surface of the base 1. The piston rod of the servo cylinder 26 is fixedly connected to the slide 32 and is used to drive the slide 32 to move, thereby moving the cuvette 14 below different sampling tubes 8.

[0021] A second guide rail 28 is fixedly provided on the top surface of the slide 32. The second guide rail 28 is arranged in the left-right direction. A slider 27 is slidably provided on the second guide rail 28. The slider 27 can slide back and forth along the second guide rail 28. A second servo motor 31 is fixedly provided on the slide 32. The output shaft of the second servo motor 31 faces upward. A rotating arm 30 is fixedly provided on the output shaft. The rotating arm 30 is arranged horizontally. A movable rod 29 is rotatably provided on the outer side of the upper surface of the rotating arm 30. The other end of the movable rod 29 is hinged to the surface of the slider 27. When the second servo motor 31 drives the rotating arm 30 to rotate, the movable rod 29 will drive the slider 27 to reciprocate along the second guide rail 28.

[0022] The top surface of the slider 27 is provided with a rotating shaft 24, and a gear 23 is fixedly mounted on the rotating shaft 24. The top surface of the slide 32 is fixedly mounted with a stand 22, and the front of the stand 22 is fixedly mounted with a rack 21. The rack 21 is arranged along the direction of the second guide rail 28. The rack 21 and the gear 23 mesh with each other. When the slider 27 moves back and forth along the second guide rail 28, the gear 23 will roll along the rack 21, thereby driving the rotating shaft 24 to rotate back and forth.

[0023] A turntable 33 is fixedly mounted on the upper end of the rotating shaft 24. The turntable 33 is horizontally positioned and can rotate together with the rotating shaft 24. A limiting plate 15 and a vertical plate 18 are fixedly mounted on the top surface of the turntable 33. A contour groove 16 is provided on the side of the limiting plate 15. The contour groove 16 matches the shape of the outer wall of the cuvette 14 and can limit one side of the cuvette 14. A screw 19 is internally threaded onto the vertical plate 18. A clamping plate 17 is rotatably mounted on one end of the screw 19. The clamping plate 17 cooperates with the contour groove 16 to clamp the cuvette 14. A rubber anti-slip pad is provided on the side of the clamping plate 17 to increase friction and prevent the cuvette 14 from slipping during movement. A rotating handle 20 is fixedly mounted on the other end of the screw 19. Rotating the rotating handle 20 can drive the screw 19 to rotate, thereby adjusting the position of the clamping plate 17 and realizing the clamping and loosening of the cuvette 14.

[0024] In use, the operator first adds the rice sample and buffer solution into the mixing drum 5 through the feed inlet 6 in a certain ratio, then covers the sealing cap of the feed inlet 6, starts the first servo motor 7, the first servo motor 7 drives the main shaft 13 to rotate, and the main shaft 13 drives multiple stirring blades 12 to rotate, stirring the rice sample and buffer solution so that the pesticides in the rice are fully dissolved in the buffer solution.

[0025] After stirring, turn off the first servo motor 7 and let it stand for 3 minutes to allow impurities such as rice residue in the extract to settle to the bottom of the stirring tank 5. At this time, the operator adds the enzyme, color reagent, and substrate to the cuvette 14 in the required proportions. Then, one side of the cuvette 14 is inserted into the contour groove 16 of the limiting plate 15. The operator rotates the handle 20, which drives the screw 19 to rotate. The screw 19 drives the clamping plate 17 to move towards the cuvette 14 until the clamping plate 17 presses against the other side of the cuvette 14, thus completing the clamping and fixing of the cuvette 14.

[0026] Next, the servo cylinder 26 is activated, which drives the slide 32 to move along the first guide rail 25, moving the cuvette 14 directly below the sampling tube 8 at the corresponding height, so that the outlet of the thin tube 10 is aligned with the inner wall of the cuvette 14. Then, the corresponding sampling valve 9 is opened, and the extract to be tested in the stirring tank 5 flows into the cuvette 14 through the sampling tube 8 and the thin tube 10 under the action of gravity. When the amount of extract added reaches the required amount, the sampling valve 9 is closed to complete the sampling.

[0027] After sampling, the lid of cuvette 14 is placed on, and the second servo motor 31 is started. The second servo motor 31 drives the rotating arm 30 to rotate. The rotating arm 30 drives the slider 27 to reciprocate along the second guide rail 28 via the movable rod 29. While the slider 27 is reciprocating, the gear 23 on the rotating shaft 24 meshes with the rack 21 on the stand 22, thereby driving the gear 23 to reciprocate. The gear 23 drives the rotating shaft 24 to rotate, which in turn drives the turntable 33 to reciprocate. The turntable 33 drives the cuvette 14 to reciprocate.

[0028] Under the combined action of horizontal reciprocating motion and revolution, the extract and reagent inside cuvette 14 can be quickly and thoroughly mixed without manual shaking, resulting in high mixing efficiency and good uniformity, effectively avoiding errors caused by manual mixing.

[0029] After mixing, turn off the second servo motor 31, and the operator turns the handle 20 to loosen the clamp 17, remove the cuvette 14, open the light-shielding cover on top of the pesticide residue detector 11, and place the cuvette 14 filled with solution steadily into the detection channel inside the instrument. After placing the cuvette, close the light-shielding cover, and then click the detection button on the operation panel of the pesticide residue detector 11. The pesticide residue detector 11 will automatically measure and calculate the inhibition rate and display it directly on the screen to complete the detection.

[0030] Open the discharge valve 4 to discharge the remaining extract and rice sample in the mixing drum 5 through the discharge port 3. After cleaning the mixing drum 5, the next test can be carried out.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any modifications, alterations, substitutions, and variations made by those skilled in the art to the above embodiments are within the scope of the present invention.

Claims

1. A sampling device for detecting pesticide residues in rice, comprising a base (1), wherein a pesticide residue detector (11) is provided on the top surface of the base (1), characterized in that, The base (1) has a stirring cylinder (5) fixed on its top surface by a support leg (2). The stirring cylinder (5) is equipped with a stirring assembly. The side wall of the stirring cylinder (5) is connected to multiple sampling tubes (8) of different heights. A sampling valve (9) is installed on the sampling tube (8). The sampling tube (8) is connected to a thin tube (10). The base (1) has a sliding frame (32) slidably mounted on its top surface. A slider (27) is slidably mounted on the sliding frame (32). A clamping and positioning assembly for holding the cuvette (14) is provided on the slider (27). The sliding frame (32) is also equipped with a driving assembly for driving the slider (27) to reciprocate and drive the cuvette (14) to revolve.

2. The rice pesticide residue detection and sampling device according to claim 1, characterized in that, The stirring assembly includes a main shaft (13) rotatably disposed inside the stirring drum (5), a plurality of stirring blades (12) are fixedly disposed on the main shaft (13), and a first servo motor (7) is fixedly disposed on the top surface of the stirring drum (5), and the output shaft of the first servo motor (7) is fixedly connected to the upper end of the main shaft (13).

3. The rice pesticide residue detection and sampling device according to claim 1, characterized in that, The mixing drum (5) has a feed inlet (6) on the top surface and a discharge outlet (3) on the bottom surface. A discharge valve (4) is installed on the discharge outlet (3).

4. The rice pesticide residue detection and sampling device according to claim 1, characterized in that, The base (1) is fixedly provided with a first guide rail (25) on its top surface. The slide (32) is slidably disposed on the first guide rail (25). The base (1) is fixedly provided with a servo cylinder (26) on its top surface. The piston rod of the servo cylinder (26) is fixedly connected to the slide (32).

5. The rice pesticide residue detection and sampling device according to claim 1, characterized in that, The drive assembly includes a second servo motor (31) fixed on the slide (32), and a rotating arm (30) is fixed on the output shaft of the second servo motor (31). A movable rod (29) is rotatably provided on the rotating arm (30), and one end of the movable rod (29) is hinged to the slider (27).

6. The rice pesticide residue detection and sampling device according to claim 5, characterized in that, The top surface of the slide (32) is fixedly provided with a second guide rail (28), and the slider (27) is slidably disposed on the second guide rail (28).

7. The rice pesticide residue detection and sampling device according to claim 1, characterized in that, The clamping and positioning assembly includes a turntable (33) on the top surface of the slider (27). A limiting plate (15) and a vertical plate (18) are fixedly provided on the top surface of the turntable (33). A contour groove (16) matching the shape of the cuvette (14) is provided on the limiting plate (15). A screw (19) is internally threaded onto the vertical plate (18). A clamping plate (17) for clamping the cuvette (14) is rotatably provided at one end of the screw (19), and a rotating handle (20) is fixedly provided at the other end. A rubber anti-slip pad is provided on the clamping plate (17).

8. The rice pesticide residue detection and sampling device according to claim 7, characterized in that, The top surface of the slider (27) is provided with a rotating shaft (24), the upper end of the rotating shaft (24) is fixedly connected to the turntable (33), a gear (23) is fixedly provided on the rotating shaft (24), and a stand (22) is fixedly provided on the top surface of the slide (32), and a rack (21) that meshes with the gear (23) is fixed on the stand (22).

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