Electrochemical rapid detector for pesticide residues in fruits

Abstract

The electrochemical rapid detector comprises a base, the upper surface of the base is fixedly connected with a stand column, the stand column is rotatably connected with a detection table through a bearing in a penetrating mode, the lower surface of the detection table is fixedly connected with a rotating block, and a plurality of sample mechanisms are arranged in the detection table. The upper surface of the base is fixedly connected with a main motor through a support, an output shaft of the main motor is fixedly connected with a driving shaft, the driving shaft is fixedly connected with a first gear in a penetrating mode, the upper surface of the base is rotatably connected with a rotating drum and a middle rod through a bearing, and the middle rod is fixedly connected with a second gear in a penetrating mode; a plurality of gear blocks are fixedly connected to the side wall of the rotary drum, and the first gear and the second gear are both engaged with the gear blocks. The detector disclosed by the invention has the advantages that the detector can be used for continuously detecting pesticide residues, can automatically finish pretreatment of samples before detection, is higher in automation degree, and greatly improves the detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of electrochemical detectors, and in particular to an electrochemical rapid detector for pesticide residues in fruits. Background Art

[0002] As one of the most nutritionally balanced foods, fruits are rich in vitamins, minerals, proteins, amino acids, and dietary fiber. Fresh fruits also contain phenols, terpenes, flavonoids, alkaloids, and other special biologically active substances that are beneficial to human health. With the rapid development of social economy, fruit production has become an important part of my country's agricultural economic development system. In order to increase fruit production and prevent the invasion of pests and diseases, some growers usually apply various pesticides during fruit planting. However, due to the low level of awareness of pesticides, abuse and excessive use often occur, resulting in a serious problem of pesticide residues in fruits, which poses a huge potential threat to food safety and public health, and also damages the ecological environment. In this context, it is of great practical significance to do a good job in the detection of pesticide residues in fruits. Therefore, before the fruits are harvested and put on the market, they need to be tested for pesticide residues. At present, there are many methods for detecting pesticide residues in fruits in my country, mainly gas chromatography, high performance liquid chromatography, chromatography-mass spectrometry, immunoassay, enzyme inhibition method, biosensor method, etc. Rapid detection of pesticide residues in fruits has become a new trend. Compared with traditional detection technology, electrochemical detection method has the advantages of fast detection speed, low cost, high sensitivity, high accuracy and strong specificity, and is currently widely used.

[0003] In the prior art, the detector can only detect one kind of fruit at a time. For the detection of multiple fruit samples, it is necessary to go through multiple sample preparation operations and then perform the detection, which greatly reduces the detection efficiency. In addition, each step needs to be performed manually, and the degree of automation is low, which also greatly affects the detection efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose an electrochemical rapid detector for pesticide residues in fruits.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an electrochemical rapid detector for pesticide residues in fruits, comprising a base, a column fixedly connected to the upper surface of the base, the column is rotatably connected to a detection platform through a bearing, a rotating gear is fixedly connected to the lower surface of the detection platform, a plurality of sample mechanisms are arranged in the detection platform, a main motor is fixedly connected to the upper surface of the base through a bracket, the output shaft of the main motor is fixedly connected to a driving shaft, the driving shaft is fixedly connected to a first gear, a rotating drum and an intermediate rod are rotatably connected to the upper surface of the base through a bearing, the intermediate rod is fixedly connected to a second gear, a plurality of tooth blocks are fixedly connected to the side wall of the rotating drum, the first gear and the second gear are both meshed with the tooth blocks, a gear ring is fixedly connected to the inner side wall of the rotating gear, and the second gear is meshed with the gear ring.

[0006] In the above-mentioned electrochemical rapid detector for pesticide residues in fruits, the sample mechanism includes a plurality of mounting grooves and rectangular holes, the mounting grooves and rectangular holes are both provided in the detection platform, the rectangular holes are communicated with the corresponding mounting grooves, the detection platform is slidably connected with a plurality of sliders through the rectangular holes, a plurality of first springs are fixedly connected between the sliders and the inner side walls of the rectangular holes, the sliders are rotatably connected with a rotating shaft through bearings, one end of the rotating shaft located in the mounting groove is fixedly connected with a rotating block, the rotating block is provided with two test tube grooves, and a clamping component is provided in the test tube groove.

[0007] In the above-mentioned electrochemical rapid detector for pesticide residues in fruits, an oscillation mechanism is provided on the side wall of the column, and the oscillation mechanism includes a fixed plate, the fixed plate is fixedly connected to the column, the driving shaft is rotatably connected to the fixed plate through a bearing, the driving shaft is fixedly connected to a turntable, an oscillation block is slidably connected to the upper surface of the fixed plate, the turntable and the upper surface of the oscillation block are fixedly connected to fixed columns, and the two fixed columns are rotatably connected to a connecting plate.

[0008] In the above-mentioned electrochemical rapid detector for pesticide residues in fruits, the clamping component includes two sliding grooves, which are symmetrically arranged on the inner wall of the test tube groove. A sliding column is slidably connected in the sliding groove, and a second spring is fixedly connected between the sliding column and the inner wall of the sliding groove. The side walls on the opposite side of the two sliding columns are fixedly connected with clamping blocks.

[0009] In the above-mentioned electrochemical rapid detector for pesticide residues in fruits, an auxiliary motor is fixedly connected to the end of the rotating shaft away from the rotating block, and the auxiliary motor is fixedly connected to the lower surface of the slider. A group of second conductive blocks are fixedly embedded in the side wall of the column, and multiple groups of first conductive blocks are fixedly embedded in the inner wall of the detection platform. Each group of the first conductive blocks and the second conductive blocks has two blocks, and each group of the first conductive blocks is electrically connected to the corresponding auxiliary motor through a wire.

[0010] In the above-mentioned electrochemical rapid detector for pesticide residues in fruits, the side wall of the column is fixedly connected to a side plate, the upper surface of the side plate is fixedly connected to an electric push rod, the output end of the electric push rod is slidably connected to the side plate, and the output end of the electric push rod is fixedly connected to an electrode plate.

[0011] In the above-mentioned electrochemical rapid detector for pesticide residues in fruits, the upper surface of the fixed plate is fixedly connected to a limit frame, the oscillation block is slidably connected between the limit frame and the fixed plate, and a rubber block is glued to the side wall of the oscillation block away from the turntable.

[0012] In the above-mentioned electrochemical rapid detector for pesticide residues in fruits, the side wall of the clamping block away from the sliding column is a curved surface and is glued with a rubber pad.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. The main motor starts, the first gear rotates to drive the drum to rotate, and the tooth blocks on the drum are of different lengths. The longer tooth blocks will periodically rotate with the second gear, and the rotation of the second gear will drive the gear ring to rotate, so that the detection table rotates periodically, and the samples are periodically sent to the bottom of the electrode plate for detection, thereby realizing automatic loading and continuous detection, greatly improving the detection efficiency;

[0015] 2. When a sample is sent to the bottom of the electrode plate for testing, the main motor still keeps rotating, thereby driving the turntable to rotate, and the oscillating block reciprocates through the connecting plate, hitting the slider so that the slider drives the turntable to oscillate, and the subsequent samples to be tested are oscillated. While testing, the subsequent samples are processed synchronously. After the previous sample is tested, the subsequent samples have been processed and can be tested directly, further improving the detection efficiency;

[0016] 3. When a sample is sent to the bottom of the electrode plate for testing, when the subsequent sample rotates to the point where the first conductive block contacts the second conductive block, the auxiliary motor can be rotated, thereby rotating the rotating block, centrifuging the sample, and coordinating with vibration. While testing, the subsequent sample is processed synchronously. When the previous sample is tested, the subsequent sample has been processed and can be directly tested, further improving the detection efficiency;

[0017] 4. Insert the sample to be processed into the test tube slot to automatically complete the sample processing and send it to the bottom of the electrode plate to wait for detection, which greatly improves the automation level of the detector and makes the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an electrochemical rapid detector for pesticide residues in fruits proposed by the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of a rapid electrochemical detector for pesticide residues in fruits under a longitudinal section according to the present invention;

[0020] Figure 3 for Figure 2 A in the enlarged view;

[0021] Figure 4 This is a schematic diagram of the internal structure of a transfer block in an electrochemical rapid detector for pesticide residues in fruits proposed by the present invention;

[0022] Figure 5 for Figure 4 The enlarged view of point B in the figure;

[0023] Figure 6 This is a schematic diagram of the internal structure of a cross-section of an electrochemical rapid detector for pesticide residues in fruits proposed by the present invention.

[0024] In the figure: 1 base, 2 column, 3 detection table, 4 rotating gear, 5 mounting groove, 6 rectangular hole, 7 slider, 8 first spring, 9 rotating shaft, 10 rotating block, 11 test tube groove, 12 main motor, 13 driving shaft, 14 first gear, 15 rotating drum, 16 gear block, 17 middle rod, 18 second gear, 19 gear ring, 20 auxiliary motor, 21 first conductive block, 22 second conductive block, 23 fixed plate, 24 oscillation block, 25 limit frame, 26 turntable, 27 fixed column, 28 connecting plate, 29 sliding groove, 30 sliding column, 31 clamping block, 32 second spring, 33 side plate, 34 electric push rod, 35 electrode plate. DETAILED DESCRIPTION

[0025] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0026] Example

[0027] Reference Figure 1-6 , an electrochemical rapid detector for pesticide residues in fruits, comprising a base 1, a column 2 is fixedly connected to the upper surface of the base 1, the column 2 is rotatably connected to a detection platform 3 through a bearing, a rotating block 4 is fixedly connected to the lower surface of the detection platform 3, a plurality of sample mechanisms are arranged in the detection platform 3, a main motor 12 is fixedly connected to the upper surface of the base 1 through a bracket, a driving shaft 13 is fixedly connected to the output shaft of the main motor 12, a first gear 14 is fixedly connected to the driving shaft 13, a rotating drum 15 and an intermediate rod 17 are rotatably connected to the upper surface of the base 1 through a bearing, a second gear 18 is fixedly connected to the intermediate rod 17, a plurality of tooth blocks 16 are fixedly connected to the side wall of the rotating drum 15, the first gear 14 and the second gear 18 are both meshed with the tooth blocks 16, a gear ring 19 is fixedly connected to the inner side wall of the rotating block 4, the second gear 18 is meshed with the gear ring 19, a portion of the tooth block 16 on the side wall of the rotating drum 15 is longer, and another portion is shorter (such as Figure 2As shown in the figure, only the longer tooth block 16 will mesh with the second gear 18, so that the second gear 18 rotates intermittently during the rotation of the drum 16.

[0028] The sample mechanism includes a plurality of mounting grooves 5 and rectangular holes 6. The mounting grooves 5 and the rectangular holes 6 are both provided in the detection table 3. The rectangular holes 6 are communicated with the corresponding mounting grooves 5. The detection table 3 is slidably connected with a plurality of sliders 7 through the rectangular holes 6. The cross section of the slider 7 is an I-shape to ensure that it slides stably in the rectangular hole 6. A plurality of first springs 8 are fixedly connected between the slider 7 and the inner side wall of the rectangular hole 6. The slider 7 is rotatably connected with a rotating shaft 9 through a bearing. A rotating block 10 is fixedly connected to one end of the rotating shaft 9 located in the mounting groove 5. The rotating block 10 is provided with two test tube grooves 11, and a clamping component is arranged in the test tube groove 11.

[0029] An oscillation mechanism is arranged on the side wall of the column 2, and the oscillation mechanism includes a fixed plate 23, which is fixedly connected to the column 2 through penetration, the driving shaft 13 and the fixed plate 23 are rotatably connected through a bearing, the driving shaft 13 is fixedly connected with a turntable 26, an oscillation block 24 is slidably connected to the upper surface of the fixed plate 23, and a fixed column 27 is fixedly connected to the upper surface of the turntable 26 and the oscillation block 24, the two fixed columns 27 are rotatably connected with a connecting plate 28 through penetration, and the fixed column 27 is rotatably connected to the connecting plate 28 through a bearing.

[0030] The clamping component includes two sliding grooves 29, and the two sliding grooves 29 are symmetrically arranged on the inner wall of the test tube groove 11. A sliding column 30 is slidably connected in the sliding groove 29, and a second spring 32 is fixedly connected between the sliding column 30 and the inner wall of the sliding groove 29. The side walls on the opposite side of the two sliding columns 30 are fixedly connected with clamping blocks 31. The setting of the clamping component enables the detector to detect test tubes of different sizes, greatly improving the applicability of the detector.

[0031] An auxiliary motor 20 is fixedly connected to one end of the rotating shaft 9 away from the rotating block 10, and the auxiliary motor 20 is fixedly connected to the lower surface of the slider 7. A group of second conductive blocks 22 are fixedly embedded in the side wall of the column 2, and multiple groups of first conductive blocks 21 are fixedly embedded in the inner wall of the detection table 3. There are two first conductive blocks 21 and two second conductive blocks 22 in each group. Each group of first conductive blocks 21 is electrically connected to the corresponding auxiliary motor 20 through a wire, and the two second conductive blocks 22 are connected to the positive and negative poles of the power supply, so that after the first conductive block 21 is in contact with the second conductive block 22, the corresponding auxiliary motor 20 can be powered on and rotated.

[0032] The side wall of the column 2 is fixedly connected to a side plate 33, the upper surface of the side plate 33 is fixedly connected to an electric push rod 34, the output end of the electric push rod 34 is slidably connected to the side plate 33, the output end of the electric push rod 34 is fixedly connected to an electrode plate 35, and an electrode sheet clamp (not shown in the figure) is arranged under the electrode plate 35 for clamping the electrode sheet.

[0033] The upper surface of the fixed plate 23 is fixedly connected to a limit frame 25, and the limit frame 25 is a concave shape with an opening facing downward. The limit frame 25 cooperates with the setting of the fixed plate 23 so that the oscillation block 24 can reciprocate stably. The oscillation block 24 is slidably connected between the limit frame 25 and the fixed plate 23. A rubber block is glued to the side wall of the oscillation block 24 away from the turntable 26. The setting of the rubber block prevents the long-term impact of the oscillation block 24 from damaging the side wall of the slider 7.

[0034] In the present invention, the treated buffer solution is injected into the test tube, and the test tube is inserted into the test tube slot 11, and the test tube is clamped and fixed by the clamp block 31 and the second spring 32. The two symmetrical test tube slots 11 need to be inserted with samples of equal mass to ensure balance during centrifugation. After the test tube to be tested is inserted, the main motor 12 is turned on.

[0035] The rotation of the main motor 12 drives the drive shaft 13 to rotate, so that the first gear 14 rotates. The first gear 14 drives the rotating drum 15 to rotate by meshing with the tooth block 16. During the rotation of the rotating drum 15, all the tooth blocks 16 rotate together. When the longer tooth block 16 rotates to mesh with the second gear 18, it drives the second gear 18 to rotate. The rotation of the second gear 18 drives the rotating gear 4 to rotate by meshing with the ring gear 19. The rotation of the rotating gear 4 drives the detection table 3 to rotate, and a sample is rotated to the bottom of the electrode plate 35. At this time, the electric push rod 34 is started to make the electrode plate 35 descend, and the electrode sheet is inserted into the sample for detection.

[0036] When it is detected that the test platform 3 starts to rotate again, the electric push rod 34 is operated to make the electrode plate 35 rise and replace the electrode sheet. At this time, the next sample has rotated to the bottom of the electrode plate 35. At this time, the motor plate 35 can be lowered to perform the test.

[0037] During the rotation of the detection table 3, when the sample to be detected rotates to the oscillation block 24, the main motor 12 rotates to drive the driving shaft 13 to rotate, so that the turntable 26 rotates. The rotation of the turntable 26 drives the oscillation block 24 to reciprocate through the connecting plate 28, continuously hitting the slider 7, and cooperating with the first spring 8, so that the rotating block 10 oscillates, and the sample in the test tube is oscillated.

[0038] The sample that has been shaken continues to rotate with the detection table 3. When it rotates to the next position, the first conductive block 21 contacts the second conductive block 22, so that the corresponding auxiliary motor 20 is energized. The auxiliary motor 20 drives the rotating block 10 to rotate through the rotating shaft 9, so that the test tube rotates with the rotating block 10, and the sample that has been shaken is centrifuged.

[0039] The sample after centrifugation will rotate to the bottom of the electrode plate 35 as the detection table 3 rotates for detection. After the sample is detected, the test tube is taken out from the test tube slot 11 and the subsequent sample to be detected is inserted for detection.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electrochemical rapid detector for pesticide residues in fruits, comprising a base (1), characterized in that: The upper surface of the base (1) is fixedly connected with a column (2), and the column (2) is rotatably connected with a detection platform (3) through a bearing. The lower surface of the detection platform (3) is fixedly connected with a rotating block (4). A plurality of sample mechanisms are arranged in the detection platform (3). The upper surface of the base (1) is fixedly connected with a main motor (12) through a bracket. The output shaft of the main motor (12) is fixedly connected with a driving shaft (13). The driving shaft (13) is fixedly connected with a first gear (14). The upper surface of the base (1) is rotatably connected with a rotating drum (15) and an intermediate rod (17) through a bearing. The intermediate rod (17) is fixedly connected with a second gear (18). The side wall of the rotating drum (15) is fixedly connected with a plurality of tooth blocks (16), and the first gear (14) and the second gear (18) are both meshed with the tooth blocks (16). The inner side wall of the rotating block (4) is fixedly connected with a gear ring (19), and the second gear (18) is meshed with the gear ring (19).

2. The electrochemical rapid detector for pesticide residues in fruits according to claim 1, characterized in that: The sample mechanism comprises a plurality of mounting grooves (5) and rectangular holes (6), wherein the mounting grooves (5) and the rectangular holes (6) are both provided in the detection platform (3), wherein the rectangular holes (6) are communicated with the corresponding mounting grooves (5), wherein the detection platform (3) is slidably connected with a plurality of sliders (7) through the rectangular holes (6), wherein a plurality of first springs (8) are fixedly connected between the sliders (7) and the inner side walls of the rectangular holes (6), wherein the sliders (7) are rotatably connected with a rotating shaft (9) through bearings, wherein one end of the rotating shaft (9) located in the mounting groove (5) is fixedly connected with a rotating block (10), wherein the rotating block (10) is provided with two test tube grooves (11), wherein a clamping component is arranged in the test tube groove (11).

3. The electrochemical rapid detector for pesticide residues in fruits according to claim 2, characterized in that: The side wall of the column (2) is provided with an oscillation mechanism, and the oscillation mechanism comprises a fixed plate (23), the fixed plate (23) and the column (2) are fixedly connected through the fixed plate (23), the driving shaft (13) and the fixed plate (23) are rotatably connected through a bearing, the driving shaft (13) is fixedly connected with a turntable (26), the upper surface of the fixed plate (23) is slidably connected with an oscillation block (24), the upper surfaces of the turntable (26) and the oscillation block (24) are fixedly connected with fixed columns (27), and the two fixed columns (27) are rotatably connected with a connecting plate (28) through the two fixed columns.

4. The electrochemical rapid detector for pesticide residues in fruits according to claim 2, characterized in that: The clamping component comprises two sliding grooves (29), the two sliding grooves (29) are symmetrically arranged on the inner wall of the test tube groove (11), a sliding column (30) is slidably connected in the sliding groove (29), a second spring (32) is fixedly connected between the sliding column (30) and the inner wall of the sliding groove (29), and a clamping block (31) is fixedly connected to the side walls on the opposite side of the two sliding columns (30).

5. The electrochemical rapid detector for pesticide residues in fruits according to claim 2, characterized in that: An auxiliary motor (20) is fixedly connected to one end of the rotating shaft (9) away from the rotating block (10), and the auxiliary motor (20) is fixedly connected to the lower surface of the slider (7). A group of second conductive blocks (22) are fixedly embedded in the side wall of the column (2), and a plurality of groups of first conductive blocks (21) are fixedly embedded in the inner wall of the detection platform (3), each group of the first conductive blocks (21) and the second conductive blocks (22) are both two, and each group of the first conductive blocks (21) is electrically connected to the corresponding auxiliary motor (20) through a wire.

6. The electrochemical rapid detector for pesticide residues in fruits according to claim 1, characterized in that: The side wall of the column (2) is fixedly connected to a side plate (33), the upper surface of the side plate (33) is fixedly connected to an electric push rod (34), the output end of the electric push rod (34) is slidably connected to the side plate (33), and the output end of the electric push rod (34) is fixedly connected to an electrode plate (35).

7. The electrochemical rapid detector for pesticide residues in fruits according to claim 3, characterized in that: The upper surface of the fixed plate (23) is fixedly connected to a limit frame (25), the oscillating block (24) is slidably connected between the limit frame (25) and the fixed plate (23), and a rubber block is glued to the side wall of the oscillating block (24) away from the rotating disk (26).

8. The electrochemical rapid detector for pesticide residues in fruits according to claim 4, characterized in that: The side wall of the clamping block (31) away from the sliding column (30) is a curved surface and is glued with a rubber pad.

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