Sample extraction device for veterinary drug residue detection in infant supplementary food

Abstract

The utility model discloses a sample extraction device for veterinary drug residue detection in infant supplementary food, which comprises a centrifugal machine and three positioning plates arranged up and down at intervals, a fixing plate is fixed on the outer side of the positioning plate in the middle, and an adjusting electric telescopic rod is fixed on the upper surface of the fixing plate. A lifting plate is fixed to the top end of the adjusting electric telescopic rod, a clear liquid extraction pipe is fixed to one end of the lifting plate in a penetrating mode, a separation cover is fixed to the bottom end of the clear liquid extraction pipe, a small extraction pump is fixed to the upper surface of the lifting plate, and the input end of the small extraction pump is connected with an extraction pipe. The separation cover is slowly immersed into extracted clear liquid, when the separation cover is immersed below the liquid level of the clear liquid and slowly descends, the clear liquid entering the inner side of the separation cover is extracted through the small extraction pump, the extraction pipe and the clear liquid extraction pipe, and sediment at the bottom of the extraction test tube cannot be influenced by flowing of the liquid in the process; therefore, the sediment is prevented from floating and being extracted.

Description

Technical Field

[0001] This utility model relates to the field of infant supplementary food technology, specifically a sample extraction device for detecting veterinary drug residues in infant supplementary foods. Background Technology

[0002] Infant complementary foods refer to cereal-based complementary foods and canned complementary foods for infants aged 6-36 months, as well as complementary nutritional supplements for infants aged 6-36 months and children aged 37-60 months. Based on the safety of infant complementary foods, substances harmful to infant nutrition and health should not be used. Necessary testing is required for potentially harmful substances in raw materials. Therefore, veterinary drug residue testing is necessary for infant complementary foods. Before testing, the infant complementary foods need to be extracted using a centrifuge and test tubes. After extraction, the supernatant liquid in the test tubes is extracted and tested.

[0003] In the detection of veterinary drug residues in infant formula, sample extraction is a crucial step. Currently, while some general technologies exist for food testing, such as patent CN 220398944 U, which discloses a solid food sampler belonging to the field of food sampler technology, this sampler's positioning hole sampling structure includes an extraction cylinder with a receiving trough and a control chamber inside. A first motor is fixed to the inner wall of the control chamber, and a rotating shaft is connected to the lower end of the first motor. A baffle is fixed to the lower end of the rotating shaft. This structure enables rapid sampling and feeding of solid food, improving detection efficiency and solving the problem of cumbersome manual sampling and feeding operations in existing technologies. However, this patent mainly focuses on the sampling process for solid food testing, which is fundamentally different from the sample extraction process for veterinary drug residue detection in infant formula, and therefore cannot solve the technical problems faced in this application.

[0004] Specifically, the following technical problems urgently need to be solved in the extraction process of veterinary drug residue detection samples for infant complementary foods addressed in this application:

[0005] Issues with residual supernatant: In current technologies, after extraction of infant formula samples, the manual separation of the supernatant and precipitate is commonly performed using a tilted test tube. This separation method leaves a small amount of supernatant remaining in the precipitate, resulting in a reduction in the amount of supernatant. Since the sample volume used in subsequent testing changes due to this reduction in supernatant, it leads to discrepancies in the test results, severely impacting the accuracy and reliability of the results.

[0006] Operational efficiency and standardization issues: The manual tilting of test tubes to separate the supernatant and precipitate is not only inefficient but also makes it difficult to ensure standardization for each operation. Inconsistencies in the techniques and pressure applied by different operators further exacerbate the uncertainty of the test results, failing to meet the requirements for efficient and standardized operation in the detection of veterinary drug residues in infant supplementary foods.

[0007] Adaptation issues for the specific characteristics of infant and toddler complementary foods: Infant and toddler complementary foods differ from ordinary foods in terms of composition and texture, and existing general food testing technologies often do not fully take these specificities into account. During sample extraction, it may not be possible to optimize for the characteristics of infant and toddler complementary foods, thus affecting the effectiveness of veterinary drug residue detection.

[0008] In summary, existing technologies cannot meet the stringent requirements for accuracy and reliability in detecting veterinary drug residues in infant formula, nor can they effectively solve the aforementioned technical problems. Therefore, there is an urgent need to develop a device specifically designed for the sample extraction process in detecting veterinary drug residues in infant formula. This device would address issues such as residual liquid, improve operational efficiency and standardization, and better adapt to the specific characteristics of infant formula, thereby ensuring the accuracy and reliability of the test results. Utility Model Content

[0009] The purpose of this invention is to overcome the defects and deficiencies of the existing technology and provide a sample extraction device for detecting veterinary drug residues in infant supplementary foods, thus solving various problems existing in the prior art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a sample extraction device for detecting veterinary drug residues in infant supplementary foods, comprising a centrifuge and three positioning plates spaced vertically apart. A fixing plate is fixed to the outer side of the middle positioning plate, and an adjustable electric telescopic rod is fixed to the upper surface of the fixing plate. A lifting plate is fixed to the top of the adjustable electric telescopic rod, and a clear liquid extraction tube is fixed through one end of the lifting plate. A separation cover is fixed to the bottom end of the clear liquid extraction tube, and a small extraction pump is fixed to the upper surface of the lifting plate. The input end of the small extraction pump is connected to the extraction tube, and one end of the extraction tube is inserted into the inner side of the clear liquid extraction tube. The output end of the small extraction pump is connected to a discharge pipe.

[0011] The bottom of the separation cover is funnel-shaped and not through, while the top of the separation cover is folded outward and level with the ground.

[0012] The bottom end of the clear liquid extraction tube is provided with multiple extraction ports, which are arranged in a circular array around the axis of the clear liquid extraction tube.

[0013] Each of the three positioning plates has a through-hole in the middle, and the axes of the three positioning holes are kept coincident.

[0014] Four symmetrically distributed support columns are provided between two adjacent positioning plates, and the support columns are located at the end corners of the positioning plates and fixed to the positioning plates.

[0015] The axis of the clear liquid extraction tube and the separation hood is aligned with the axis of the positioning hole, and the maximum outer diameter of the separation hood is smaller than the inner diameter of the extraction test tube.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention involves slowly immersing a separation hood into the extracted clarified liquid. As the hood descends below the liquid surface, the clarified liquid inside the hood is extracted using extraction tubes and clarified liquid extraction tubes. During this process, the liquid flow does not affect the sediment at the bottom of the extraction tube, ensuring that the sediment does not float and is not extracted. The process continues until the top edge of the separation hood contacts the sediment, at which point the clarified liquid at the top of the sediment is completely extracted. This avoids discrepancies in test results due to incomplete extraction. Through its precise separation, complete extraction, and stable operation, this invention effectively solves the problems existing in the prior art, providing a more accurate, reliable, and efficient solution for detecting veterinary drug residues in infant supplementary foods. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a structural schematic diagram of the positioning plate and support column of this utility model;

[0020] Figure 3 This is a cross-sectional view of the separation cover of this utility model;

[0021] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle.

[0022] In the diagram: 1. Positioning plate; 2. Fixing plate; 3. Support column; 4. Positioning hole; 5. Adjustable electric telescopic rod; 6. Lifting plate; 7. Clear liquid extraction pipe; 8. Separation hood; 9. Small extraction pump; 10. Extraction pipe; 11. Discharge pipe; 12. Centrifuge; 13. Extraction port. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0024] like Figures 1 to 4 As shown, a sample extraction device for detecting veterinary drug residues in infant supplementary food includes a centrifuge 12 and three positioning plates 1 arranged vertically and horizontally. Each of the three positioning plates 1 has a through-hole 4 in the middle, and the axes of the three positioning holes 4 are kept coincident. Four symmetrically distributed support columns 3 are provided between two adjacent positioning plates 1. The support columns 3 are located at the corners of the positioning plates 1 and fixed to the positioning plates 1. The extraction test tube is positioned and placed through the positioning hole 4 in the middle of the positioning plate 1 to ensure that the extraction test tube is kept vertically upward.

[0025] A fixing plate 2 is fixed to the outer side of the middle positioning plate 1. An adjustable electric telescopic rod 5 is fixed to the upper surface of the fixing plate 2. A lifting plate 6 is fixed to the top of the adjustable electric telescopic rod 5. A clear liquid extraction tube 7 is fixed through one end of the lifting plate 6. A separation hood 8 is fixed to the bottom end of the clear liquid extraction tube 7. A small extraction pump 9 is fixed to the upper surface of the lifting plate 6. The input end of the small extraction pump 9 is connected to an extraction tube 10, and one end of the extraction tube 10 is inserted into the inside of the clear liquid extraction tube 7. The output end of the small extraction pump 9 is connected to a discharge tube 11. The separation hood 8 is slowly immersed into the clear liquid after extraction. When the separation hood 8 is immersed below the surface of the clear liquid and slowly descends, the clear liquid entering the inside of the separation hood 8 is extracted by the small extraction pump 9, the extraction tube 10, and the clear liquid extraction tube 7. During this process, the flow of liquid will not affect the sediment at the bottom of the extraction tube, thus ensuring that the sediment will not float and be extracted. By precisely controlling the descent speed of the separation hood and the extraction process, the standardization and stability of the operation are achieved. The device is equipped with an advanced control system that allows for preset parameters such as the descent speed of the separation hood and the extraction flow rate, ensuring that each operation strictly adheres to these preset parameters. Regardless of the operator, consistency in the separation and extraction process is guaranteed each time. This stable and controllable operation results in highly repeatable test results. Even when testing is conducted at different times and locations, accurate and consistent test results can be obtained using this device, providing reliable technical support for the detection of veterinary drug residues in infant supplementary foods.

[0026] The separation hood 8 has a funnel-shaped bottom that is not continuous. The top of the separation hood 8 is folded outwards and level with the ground. The specially shaped separation hood 8 is used to extract the supernatant, and the suction force during extraction does not affect the precipitate at the bottom of the extraction tube. This unique separation hood design creates a relatively closed space when the top edge of the hood contacts the precipitate, completely separating the precipitate from the supernatant. At this point, the combined action of the extraction tube and the supernatant extraction tube allows for complete extraction of the supernatant from the top of the precipitate. This complete extraction method ensures the integrity of the test sample, enabling the test results to accurately reflect the true situation of veterinary drug residues in infant formula. It can accurately detect both high and low concentrations of veterinary drug residues, greatly improving the accuracy and reliability of the detection and providing strong protection for the quality and safety of infant formula.

[0027] The axes of the clear liquid extraction tube 7 and the separation hood 8 are aligned with the axis of the positioning hole 4, and the maximum outer diameter of the separation hood 8 is smaller than the inner diameter of the extraction test tube, ensuring that the separation hood 8 enters the extraction test tube vertically and does not come into contact with the extraction test tube.

[0028] The bottom end of the clear liquid extraction tube 7 is provided with multiple extraction ports 13. The extraction ports 13 are arranged in a circular array around the axis of the clear liquid extraction tube 7. The presence of the extraction ports 13 at the bottom of the clear liquid extraction tube 7 ensures that the clear liquid entering the separation hood 8 can be extracted and transported upward along the clear liquid extraction tube 7.

[0029] Working principle: First, the infant supplementary food to be tested is added into the extraction test tube, and sufficient extraction reagent is added to the extraction test tube. The extraction test tube is placed inside the centrifuge 12, and the centrifuge 12 is powered on and started. The centrifuge 12 is used to centrifuge and extract the infant supplementary food. After centrifugation and extraction are completed, the extraction test tube is taken out and placed inside the positioning hole 4. After the precipitate settles at the bottom of the extraction test tube, the electric telescopic rod 5 is powered on and started, so that the electric telescopic rod 5 drives the lifting plate 6, the clear liquid extraction tube 7, and the separation hood 8 to descend until the top of the separation hood 8 is immersed below the liquid surface inside the extraction test tube. At this time, the small extraction pump 9 extracts the clear liquid that has entered the separation hood 8 through the extraction tube 10 and the clear liquid extraction tube 7. The extracted clear liquid is stored in the container through the discharge tube 11 until the top edge of the separation hood 8 contacts the precipitate inside the extraction test tube. At this time, the small extraction pump 9 stops running, realizing the complete separation of the clear liquid at the top of the precipitate and avoiding incomplete extraction of clear liquid, which may lead to differences in the test results.

[0030] The above process cleverly solves the problem of precipitation interference by slowly immersing the separation hood into the extracted supernatant. As the separation hood is submerged below the surface of the supernatant and slowly descends, the extraction tube and the supernatant extraction tube work together to precisely extract the supernatant entering the inner part of the separation hood. At this time, the flow of liquid is strictly controlled inside the separation hood, forming a relatively independent and stable liquid environment. Due to the blocking effect of the separation hood, the precipitate at the bottom of the extraction tube is not affected by the liquid flow and remains stable. Even when the top edge of the separation hood comes into contact with the precipitate, the precipitate remains in place and does not float or get extracted. This precise separation method ensures the purity of the supernatant, avoids interference from precipitation in the test results, provides a pure sample for subsequent accurate veterinary drug residue testing, and greatly improves the accuracy and reliability of the test results.

[0031] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0032] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A sample extraction device for detecting veterinary drug residues in infant supplementary foods, comprising a centrifuge (12) and three positioning plates (1) spaced vertically, characterized in that: A fixing plate (2) is fixed on the outer side of the positioning plate (1) in the middle. An adjusting electric telescopic rod (5) is fixed on the upper surface of the fixing plate (2). A lifting plate (6) is fixed at the top of the adjusting electric telescopic rod (5). A clear liquid extraction tube (7) is fixed through one end of the lifting plate (6). A separation cover (8) is fixed at the bottom end of the clear liquid extraction tube (7). A small extraction pump (9) is fixed on the upper surface of the lifting plate (6). An extraction tube (10) is connected to the input end of the small extraction pump (9), and one end of the extraction tube (10) is inserted into the inside of the clear liquid extraction tube (7). A discharge tube (11) is connected to the output end of the small extraction pump (9).

2. The sample extraction device for detecting veterinary drug residues in infant supplementary foods according to claim 1, characterized in that: The bottom of the separation cover (8) is funnel-shaped and not through at the bottom end, and the top of the separation cover (8) is folded outward and level with the ground.

3. The sample extraction device for detecting veterinary drug residues in infant supplementary foods according to claim 1, characterized in that: The bottom end of the clear liquid extraction tube (7) is provided with multiple extraction ports (13), and the extraction ports (13) are arranged in a circular array around the axis of the clear liquid extraction tube (7).

4. The sample extraction device for detecting veterinary drug residues in infant supplementary foods according to claim 1, characterized in that: Each of the three positioning plates (1) has a through-hole (4) in the middle, and the axes of the three positioning holes (4) are kept coincident.

5. The sample extraction device for detecting veterinary drug residues in infant supplementary foods according to claim 4, characterized in that: Four symmetrically distributed support columns (3) are provided between two adjacent positioning plates (1). The support columns (3) are located at the end corners of the positioning plates (1) and are fixed to the positioning plates (1).

6. The sample extraction device for detecting veterinary drug residues in infant supplementary foods according to claim 5, characterized in that: The axes of the clear liquid extraction tube (7) and the separation hood (8) are aligned with the axis of the positioning hole (4), and the maximum outer diameter of the separation hood (8) is smaller than the inner diameter of the extraction tube.

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