An oxidation stability testing device utilizing near infrared technology
By integrating the connecting components and controller with the limiting channel and the slot, the problems of sample positioning offset and optical path alignment in the existing device are solved, and high precision and high repeatability of vegetable oil oxidation stability detection are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 贵州汇腾科技有限公司
- Filing Date
- 2025-08-25
- Publication Date
- 2026-08-04
AI Technical Summary
Existing near-infrared detection devices for vegetable oils lack precise limiting structures and universal adaptability designs for solid and liquid samples, resulting in sample positioning offsets and low optical path alignment accuracy, which affects the accuracy and repeatability of oxidative stability detection.
The connection components, which combine a limiting channel and a limiting slot, ensure stable installation of the cuvette. The detection optical path is formed by the parallel arrangement of the near-infrared emitting unit and the receiving unit and the limiting channel. An integrated controller enables automated detection.
This improved the installation stability of the cuvettes, ensured optical path alignment, enhanced detection accuracy and repeatability, and improved the practicality and ease of operation of the device.
Smart Images
Figure CN224594477U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vegetable oil detection technology, specifically to an oxidative stability testing device utilizing near-infrared technology. Background Technology
[0002] In the field of vegetable oil production, processing, and quality supervision, there is an urgent need for testing key quality indicators of vegetable oils and related seeds (such as camellia seeds) to ensure product quality and extend shelf life. Among these, oxidative stability is one of the core indicators for assessing the freshness and quality of vegetable oils, directly affecting product safety and market acceptance. Currently, the industry has developed various technical pathways for vegetable oil testing, covering the detection of indicators such as color, transparency, smoke point, acid value, and peroxide value. Commonly used techniques include infrared analysis, temperature sensing, and chemical reagent testing. These technologies and supporting equipment are widely used in grain and oil processing enterprises, third-party testing institutions, and other scenarios, providing basic support for vegetable oil quality control.
[0003] In the prior art, patent publication number "CN207992177U" discloses a vegetable oil detection device, including a detection box, an infrared emitter, a chemical detection box, and other structures. It analyzes the color and transparency of the vegetable oil layer through the infrared emitter, and simultaneously uses an acid value detection box and a peroxide value detection box to achieve multi-index detection, which improves the comprehensiveness of the detection to a certain extent. Patent publication number "CN209198360U" discloses a vegetable oil detection device, involving a heating structure, a sample cup, a smoke collection device, etc. It detects the smoke point of vegetable oil through a contact temperature sensor and a smoke sensor, and uses a cooling fan to improve detection efficiency and optimize the stability of the detection process.
[0004] The existing technologies mentioned above have achieved certain results in terms of structural design for multi-index detection of vegetable oils and smoke point detection. However, they still have shortcomings in the targeted structure for near-infrared detection of oxidation stability: CN207992177U lacks a precise limiting structure for the matching of the infrared emitter and the sample, and the sample is prone to positional shift during the detection process, affecting the stability of the infrared signal; CN209198360U is mainly for smoke point detection and does not involve the adaptation design of sample support and optical path alignment in near-infrared detection. In particular, it lacks a universal limiting channel and connecting components for both solid and liquid samples, resulting in low matching accuracy between the cuvette and the detection optical path when detecting samples of different forms, which easily leads to optical path shift and affects the accuracy and repeatability of oxidation stability detection. Utility Model Content
[0005] The present invention aims to provide an oxidation stability testing device using near-infrared technology to solve the technical problems in existing near-infrared detection devices for vegetable oils, which lack precise positioning for cuvettes and universal adaptable structures for solid and liquid samples, resulting in sample positioning offset and low optical path alignment accuracy, thus affecting the accuracy and repeatability of oxidation stability detection.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: an oxidation stability testing device utilizing near-infrared technology, comprising a housing, a near-infrared emitting unit, a near-infrared receiving unit, and a limiting channel. The near-infrared emitting unit and the near-infrared receiving unit are located at opposite ends of the housing and are parallel to each other. A controller and a power supply are connected inside the housing. The controller is electrically connected to the near-infrared emitting unit, the near-infrared receiving unit, and the power supply. The limiting channel is located between the near-infrared emitting unit and the near-infrared receiving unit, and extends through the housing in a direction perpendicular to near-infrared detection. Limiting slots are provided at both ends of the limiting channel. A cuvette is connected inside the limiting channel, and the cuvette is connected to a connecting component that matches the limiting channel.
[0007] The principle of this scheme is as follows: the connecting components are pre-installed on the cuvette to form an integral structure; the power supply powers the device, and the controller controls the near-infrared emitting unit to emit near-infrared light; the cuvette equipped with the connecting components is fixed by the connecting components engaging with the limiting slots of the limiting channel, ensuring that it is stably positioned between the near-infrared emitting unit and the near-infrared receiving unit; the near-infrared light emitted by the near-infrared emitting unit passes through the sample in the cuvette, and after being absorbed by the sample, the remaining light signal is received by the near-infrared receiving unit; the controller receives and processes the signal from the near-infrared receiving unit, thereby realizing the detection of the oxidation stability of the sample.
[0008] The advantages of this solution are: 1. The limiting channel and limiting slot work together to connect the cuvette, achieving stable installation of the cuvette through the connecting components, thus solving the problem of sample displacement in existing devices; 2. The near-infrared emitting unit and the near-infrared receiving unit are arranged in parallel and form a detection optical path through the limiting channel, ensuring optical path alignment and improving detection accuracy; 3. The controller integrates control functions to automate the detection process and improve operational convenience; 4. The overall structure is compatible with cuvettes, meeting the near-infrared detection requirements for the oxidation stability of vegetable oils and seeds, enhancing the practicality of the device.
[0009] Preferably, as an improvement, the connecting assembly includes a limiting frame and locking blocks. The limiting frame is connected around the cuvette and its height is the same as the cuvette. A connecting rod is connected to the front side wall of the limiting frame. The locking blocks are horizontally connected to the eight endpoints of the limiting frame and are connected within the limiting slots. The eight locking blocks around the limiting frame, in cooperation with the limiting slots, further enhance the stability of the cuvette installation, preventing shaking during testing, and ensuring the compatibility between the cuvette and the limiting channel.
[0010] Preferably, as an improvement, the inner wall of the limiting channel is provided with a positioning hole, and the side wall of the limiting frame is connected to a positioning pin, which is connected to the positioning hole. The cooperation between the positioning pin and the positioning hole enables precise positioning of the cuvette, reduces installation errors, ensures consistent optical path position in each test, and improves the repeatability of test results.
[0011] Preferably, as an improvement, the near-infrared emitting unit, the near-infrared receiving unit, and the limiting channel are connected, and the connection point is located on a horizontal line. The near-infrared emitting unit, the near-infrared receiving unit, and the limiting channel are collinear, ensuring that near-infrared light penetrates the sample perpendicularly, reducing optical path deviation, and improving the accuracy of the detection signal.
[0012] Preferably, as an improvement, the inner wall of the limiting channel is covered with a light-shielding layer, which is made of black anodized coating. The black anodized coating can reduce the interference of external stray light on the near-infrared optical path, ensuring that the receiving unit only receives valid signals and improving detection accuracy.
[0013] Preferably, as an improvement, the cuvette is made of quartz glass, and the two sides of the cuvette facing the near-infrared emitting unit and the near-infrared receiving unit are polished and transparent. Attached Figure Description
[0014] Figure 1 This is a front sectional view of an oxidation stability testing device utilizing near-infrared technology according to this utility model. Figure 2 This is a front view of an oxidation stability testing device utilizing near-infrared technology according to this utility model; Figure 3 This is a schematic diagram of the connecting components in an embodiment of an oxidation stability testing device utilizing near-infrared technology according to this utility model.
[0015] The reference numerals in the accompanying drawings include: housing 1, controller 101, power supply 102, near-infrared emitting unit 2, emitting channel 3, limiting channel 4, limiting slot 5, near-infrared receiving unit 6, receiving channel 7, positioning hole 8, positioning pin 801, locking block 9, limiting frame 10, connecting rod 1001, and control panel 11. Detailed Implementation
[0016] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figure 1 - Appendix Figure 3As shown: An oxidation stability testing device utilizing near-infrared technology includes a housing 1, a near-infrared emitting unit 2, a near-infrared receiving unit 6, a limiting channel 4, and connecting components. The near-infrared emitting unit 2 and the near-infrared receiving unit 6 are respectively fixed to the left and right ends of the housing 1 by bolts, and their axes are parallel to each other. A control panel 11 is provided on the outer surface of the housing 1. Inside the housing 1, a controller 101 (model STM32F103) and a power supply 102 (DC12V / 2A) are fixed by brackets. The controller 101 is electrically connected to the control panel 11, the near-infrared emitting unit 2 (800-2500nm LED array), the near-infrared receiving unit 6 (InGaAs detector), and the power supply 102 to form a closed-loop control circuit. The limiting channel 4 is located between the near-infrared emitting unit 2 and the near-infrared receiving unit 6. A transmission channel 3 connects the near-infrared emitting unit 2 and the limiting channel 4, and a receiving channel 7 connects the near-infrared receiving unit 6 and the limiting channel 4. The axes are collinear, forming a horizontal detection optical path. The limiting channel 4 penetrates the housing 1 along the front-back direction perpendicular to the optical path. The rear inner wall of the limiting channel 4 is symmetrically provided with positioning holes 8. The left and right inner walls of the limiting channel 4 are each provided with two sets of upper and lower limiting slots 5. The inner wall of the limiting channel is sprayed with a black anodized coating as a light-shielding layer. A quartz glass cuvette is adapted inside the limiting channel 4. The left and right sides of the cuvette are polished and light-transmitting surfaces. The connecting components include a limiting frame 10 and eight locking blocks 9. The limiting frame 10 is a square frame (material...). The limiting frame 10 is made of ABS material and is fitted around the cuvette at the same height. Eight elastic rubber blocks 9 are integrally formed on the eight ends of the limiting frame 10. The blocks 9 are fitted with the limiting slots 5 with a clearance. A connecting rod 1001 is fixedly connected to the front side of the limiting frame 10. A positioning pin 801 is integrally formed on the rear side wall of the limiting frame 10. The positioning pin 801 is slidably fitted with the positioning hole 8. A hollow area is opened in the middle of the left and right sides of the limiting frame 10 to avoid blocking the light path of the transmitting channel 3 and the receiving channel 7.
[0017] The specific implementation process is as follows: Before testing, the connecting components are pre-installed on the cuvette: the limiting frame 10 is inserted from the top of the cuvette, so that the eight locking blocks 9 fit tightly against the side wall of the cuvette, completing the overall assembly. If testing a liquid sample (such as camellia seed oil), the sample is poured into the cuvette to a height of 12mm, ensuring that the light path area formed by the transmitting channel 3 and the receiving channel 7 is covered; if testing a solid sample (such as camellia seeds), a seed material of suitable size is laid flat at the bottom of the cuvette, with the thickness controlled within 5mm, to avoid blocking the light path.
[0018] Holding the connecting rod 1001 at the front end of the limiting frame 10, push the assembled cuvette into the limiting channel 4 in the front-back direction, so that the locking block 9 slides into the limiting slot 5 until the positioning pin 801 is inserted into the positioning hole 8. At this time, the left and right light-transmitting surfaces of the cuvette are precisely aligned with the axes of the emitting channel 3 and the receiving channel 7. After starting the device, the power supply 102 supplies power to each component. The controller 101 controls the near-infrared emitting unit 2 to emit 800-2500nm near-infrared light. The light passes through the sample through the emitting channel 3. After being partially absorbed by the oxidation products, the remaining light is captured by the near-infrared receiving unit 6 through the receiving channel 7 and converted into an electrical signal. The controller 101 processes the signal and obtains the oxidation stability index. The control panel 11 displays the working parameters of the near-infrared emitting unit 2 in real time. The oxidation stability index is displayed synchronously on the control panel 11. After the test is completed, turn off the device through the control panel 11, pull out the cuvette, disassemble the connecting components for cleaning, and let it dry for later use.
[0019] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. An oxidation stability testing device utilizing near-infrared technology, characterized in that: The device includes a housing, a near-infrared emitting unit, a near-infrared receiving unit, and a limiting channel. The near-infrared emitting unit and the near-infrared receiving unit are located at opposite ends of the housing and are parallel to each other. A controller and a power supply are connected inside the housing. The controller is electrically connected to the near-infrared emitting unit, the near-infrared receiving unit, and the power supply. The limiting channel is located between the near-infrared emitting unit and the near-infrared receiving unit and extends through the housing in a direction perpendicular to near-infrared detection. Limiting slots are provided at both ends of the limiting channel. A cuvette is connected inside the limiting channel, and the cuvette is connected to a connecting component that matches the limiting channel.
2. The oxidation stability testing device using near-infrared technology according to claim 1, characterized in that: The connecting component includes a limiting frame and a locking block. The limiting frame is connected around the cuvette and is at the same height as the cuvette. A connecting rod is connected to the front side wall of the limiting frame. The locking block is horizontally connected to the eight ends of the limiting frame and is connected to the limiting slot.
3. The oxidation stability testing device using near-infrared technology according to claim 2, characterized in that: The inner wall of the limiting channel is provided with a positioning hole, and the side wall of the limiting frame is connected with a positioning pin, which is connected to the positioning hole.
4. The oxidation stability testing device using near-infrared technology according to claim 3, characterized in that: The near-infrared emitting unit, the near-infrared receiving unit, and the limiting channel are connected and the connection point is located on a horizontal line.
5. The oxidation stability testing device using near-infrared technology according to claim 4, characterized in that: The inner wall of the limiting channel is covered with a light-shielding layer, which is made of black anodized coating.
6. The oxidation stability testing device using near-infrared technology according to claim 5, characterized in that: The cuvette is made of quartz glass, and the two sides of the cuvette facing the near-infrared emitting unit and the near-infrared receiving unit are polished and transparent.