Device for rapidly and quantitatively detecting acid value of fried oil

Abstract

The utility model discloses a device for rapidly and quantitatively detecting the acid value of fried oil, and relates to the technical field of edible oil detection. The device is of an injector structure and comprises a cylinder body, a sample injection needle head and a push rod, a sample injection needle head is arranged at the front end of the cylinder body; the push rod can reciprocate relative to the inner wall of the barrel; an oil sample inlet dissolving agent and color developing agent indicating line, an oil sample inlet indicating line and an acid value scale line are arranged on the outer wall of the cylinder body; a piston is arranged at the front end of the push rod, a connecting rod is arranged on the piston, the device is further provided with a magnetic stirring system, the magnetic stirring system comprises a stirring rod and a rotation driving part, and magnetic parts are arranged on the stirring rod and the rotation driving part respectively. And the magnetic part on the stirring rod and the magnetic part on the rotary driving part are arranged in a manner that heteropoles attract each other and face each other. The edible oil oleic acid detection device is simple to operate, high in detection result accuracy and suitable for popularization.

Description

Technical Field

[0001] This utility model belongs to the field of edible oil testing technology, and specifically relates to a device for rapid quantitative detection of acid value in frying oil. Background Technology

[0002] Acid value, also known as neutralization value, acidity, or acidity, refers to the number of milligrams of potassium hydroxide or sodium hydroxide required to neutralize the free fatty acids in 1 gram of oil. It is a measurement standard for the number of free carboxylic acid groups in a compound (such as fatty acids) or mixture. Measuring acid value can assess the freshness and quality of oils. Fresh, pure oils obtained from normal raw materials have very low acid values, not exceeding 2-3 mg / g. The acid value of edible oils should not exceed 5 mg / g. Higher acid values ​​indicate a higher degree of oil spoilage, therefore, acid value testing is necessary. Currently, the most common methods for detecting acid value in edible oils are titration and semi-quantitative test strips. Traditional titration methods are time-consuming and labor-intensive, requiring professional technicians, while semi-quantitative test strips are more susceptible to human error, easily caused by excessive or insufficient sample volume due to varying immersion times. Patent CN 108519376 A discloses a rapid determination device for acid value in edible oil used in frying processes and its method of use. While this device can detect acid value, the mixing of oil and reagents is not uniform enough during use, leading to inaccurate test results. Furthermore, calculations are required when using this device, and the acid value cannot be directly obtained. Therefore, further improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide a rapid quantitative detection device for the acid value of frying oil, thereby overcoming the shortcomings of existing oleic acid detection devices, such as uneven mixing of samples and reagents and cumbersome operation. The specific technical solution is as follows:

[0004] A rapid quantitative detection device for the acid value of frying oil is provided. The device is a syringe structure, including a cylinder, an injection needle, and a push rod. The injection needle is provided at one end of the cylinder. One end of the push rod is located inside the cylinder, and the other end is located outside the cylinder. The push rod can reciprocate relative to the inner wall of the cylinder.

[0005] The outer wall of the cylinder is provided with an indicator line for the solvent and colorimetric agent for the inlet sample, an indicator line for the inlet sample, and an acid value scale line. The indicator line for the solvent and colorimetric agent for the inlet sample, the indicator line for the inlet sample, and the acid value scale line are arranged sequentially from the end closest to the injection needle to the end furthest from the injection needle.

[0006] The push rod is located at one end of the cylinder and has a piston, through which a connecting rod is installed. The device also includes a magnetic stirring system, which includes a stirring rod and a rotation drive. A bearing is fitted on one end of the connecting rod near the injection needle, and the stirring rod is fixed on the bearing. The other end of the connecting rod is connected to the push rod, and the rotation drive is located inside the push rod. A magnetic element is provided on the stirring rod, and a magnetic element is provided on the rotating shaft of the rotation drive. The magnetic elements on the stirring rod and the magnetic elements on the rotation drive are oppositely attracted and oppositely arranged. When the magnetic element on the rotation drive rotates, the magnetic element on the stirring rod will rotate accordingly.

[0007] Furthermore, the front end of the cylinder is provided with a connector, and the injection needle is inserted into the connector.

[0008] Furthermore, the piston is interference-fitted with the inner surface of the cylinder.

[0009] Furthermore, the magnetic components of the rotation drive are two independent magnets, which are arranged in a straight line and are magnetically opposite at positions close to each other; the magnetic components on the stirring rod are also correspondingly set as two independent magnets, and each magnet is parallel to the corresponding magnet on the rotation drive.

[0010] Furthermore, the rotation drive also includes a motor, a battery, and a switch, with the motor connected to the battery via the switch.

[0011] Furthermore, the switch is located at the end of the push rod away from the piston.

[0012] Furthermore, the device for detecting the acid value of frying oil is also equipped with a container A containing an oil sample solvent and a colorimetric agent, and a container B containing a sodium hydroxide solution, wherein the containers A and B are set up independently.

[0013] Compared with existing technologies, this utility model has the following beneficial effects:

[0014] 1. The magnetic stirring system in this invention can rotate at high speed, effectively mixing the oil sample to be tested with the solvent, color developer, and sodium hydroxide solution, thereby improving the uniformity and speed of the reaction and thus improving the accuracy and reproducibility of the test results.

[0015] 2. This utility model is equipped with an indicator line for the solvent and colorimetric reagent for the oil sample, an indicator line for the oil sample, and an acid value scale line. The detection process only requires obtaining the sample and reaction solvent according to the indicator lines. The operation is simple and can be quickly performed without professional technicians. Moreover, the detection results can be directly read on the acid value scale line without additional calculation, which is convenient and fast. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the magnetic stirring system of this utility model.

[0019] Explanation of key figure labels:

[0020] 1-Cylinder, 2-Injection needle, 3-Push rod, 4-Connector, 5-Indicator line for oil sample solvent and colorimetric agent, 6-Injection line for oil sample, 7-Acid value scale line, 8-Piston, 9-Stirring rod, 10-Rotation drive component, 11-Magnetic component, 12-Bearing, 13-Connecting rod, 14-Battery, 15-Motor, 16-Switch, 17-Container A containing oil sample solvent and colorimetric agent, 18-Container B containing sodium hydroxide solution. Detailed Implementation

[0021] 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 protection scope of the present utility model.

[0022] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0025] Example 1

[0026] like Figure 1 As shown, the device for detecting the acid value of frying oil in this embodiment is a syringe structure, including a cylinder 1, a sampling needle 2 and a push rod 3; one end of the cylinder 1 is provided with a connector 4, and the sampling needle 2 is inserted into the connector 4; one end of the push rod 3 is located inside the cylinder 1, and the other end is located outside the cylinder 1, and the push rod 3 can reciprocate relative to the inner wall of the cylinder 1.

[0027] Specifically, the outer wall of the cylinder 1 is provided with an indicator line 5 for the oil sample solvent and color developer, an oil sample indicator line 6, and an acid value scale line 7. These indicators are arranged sequentially from the end closest to the injection needle 2 to the end furthest from it. The principle for determining the positions of the indicator lines and scale lines is as follows: Since it is known that sodium hydroxide has a certain direct proportional relationship with the acid value, the acid value can be calculated based on the amount of sodium hydroxide used. Therefore, a predetermined amount of oil sample solvent and color developer is first determined, and the positions of the indicator lines for the oil sample solvent and color developer are marked on the cylinder 1. Based on the amount of oil sample solvent and color developer, the amount of oil sample can be determined, and the position of the oil sample indicator line is marked on the cylinder 1. After the amount of oil sample in the cylinder 1 is fixed, the relationship between the oil sample, sodium hydroxide, and acid value is used to calculate the corresponding acid value for each amount of sodium hydroxide solution, and thus, the acid value scale lines are marked.

[0028] The device for detecting the acid value of frying oil is also equipped with a container A17 containing a solvent and a colorimetric reagent for the oil sample, and a container B18 containing a sodium hydroxide solution. Containers A and B are set up independently. Operators only need to draw the corresponding solvent and oil sample from the container according to the indicator line, and visually read the acid value of the tested oil sample through the acid value scale line, which is simple and quick.

[0029] Specifically, the push rod 3 is provided with a piston 8 at one end inside the cylinder 1, and the piston 8 is interference-fitted with the inner surface of the cylinder 1; a connecting rod 13 is provided through the piston 8.

[0030] Specifically, such as Figure 2 As shown, the device also includes a magnetic stirring system, which includes a stirring rod 9 and a rotation drive component 10. A bearing 12 is sleeved on one end of the connecting rod 13 near the injection needle 2, and the stirring rod 9 is fixed on the bearing 12. The other end of the connecting rod 13 is connected to the push rod 3, and the rotation drive component 10 is located inside the push rod 3. A magnetic component 11 is provided on the stirring rod 9, and a magnetic component 11 is provided on the rotation shaft of the rotation drive component 10. The magnetic components 11 on the stirring rod 9 and the magnetic components 11 on the rotation drive component 10 are oppositely attracted and arranged opposite each other. When the magnetic component on the rotation drive component 10 rotates, the magnetic component on the stirring rod 9 will rotate accordingly.

[0031] Specifically, the magnetic component 11 of the rotating drive consists of two independent magnets, which are arranged in a straight line at intervals, and the magnets at close proximity are opposite in magnetic properties. The magnetic component 11 on the stirring rod 9 is also composed of two independent magnets, each parallel to its corresponding magnet on the rotating drive. The rotating drive 10 also includes a motor 15, a battery 14, and a switch 16. The motor 15 is connected to the battery 14 via the switch 16, which is located at the end of the push rod 3 furthest from the piston 8. When the switch 16 is turned on, the motor 15 is energized and rotates, generating a rotating magnetic field. This rotating magnetic field causes the magnet on the stirring rod 9 to rotate in a circular motion, thereby forming a vortex in the liquid inside the cylinder 1. This stirs the liquid, making the reaction uniform and improving the accuracy of the detection results.

[0032] Next, the working principle of this embodiment will be described in detail so that those skilled in the art can better understand this utility model:

[0033] The operation method of this utility model is as follows: First, install the battery 14 into the magnetic stirring system, press the switch 16 on the push rod 3 to make the stirring rod 9 rotate, then draw the solution in container A17 (container A contains a dissolving agent and a color developer for dissolving oil), draw until the oil sample dissolving agent and color developer indicator line 5 is reached, then stop drawing. Then draw the high-temperature oil sample until the oil sample indicator line 6 is reached, then stop drawing. Finally, draw the sodium hydroxide solution reagent in container B18, while observing whether the color of the indicator in the solution in the cylinder changes. When the standard color change occurs, stop drawing and read the acid value scale. The corresponding acid value of the high-temperature frying oil can be obtained, thus indicating the spoilage status of the oil.

[0034] In summary, the method of using this invention to detect oleic acid in edible oils is not only inexpensive and simple to operate, but also yields highly accurate results.

[0035] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A device for rapid quantitative detection of acid value in frying oil, characterized in that, The device is a syringe structure, including a barrel, a sample injection needle, and a plunger; one end of the barrel is provided with the sample injection needle; one end of the plunger is located inside the barrel, and the other end is located outside the barrel, and the plunger can reciprocate relative to the inner wall of the barrel; The outer wall of the cylinder is provided with an indicator line for the solvent and colorimetric agent for the inlet sample, an indicator line for the inlet sample, and an acid value scale line. The indicator line for the solvent and colorimetric agent for the inlet sample, the indicator line for the inlet sample, and the acid value scale line are arranged sequentially from the end closest to the injection needle to the end furthest from the injection needle. The push rod is located at one end of the cylinder and has a piston, through which a connecting rod is installed. The device also includes a magnetic stirring system, which includes a stirring rod and a rotation drive. A bearing is fitted on one end of the connecting rod near the injection needle, and the stirring rod is fixed on the bearing. The other end of the connecting rod is connected to the push rod, and the rotation drive is located inside the push rod. A magnetic element is provided on the stirring rod, and a magnetic element is provided on the rotating shaft of the rotation drive. The magnetic elements on the stirring rod and the magnetic elements on the rotation drive are oppositely attracted and oppositely arranged. When the magnetic element on the rotation drive rotates, the magnetic element on the stirring rod will rotate accordingly.

2. The device for rapid quantitative detection of acid value in frying oil according to claim 1, characterized in that, One end of the cylinder is provided with a connector, and the injection needle is inserted into the connector.

3. The device for rapid quantitative detection of acid value in frying oil according to claim 1, characterized in that, The piston is interference-fitted with the inner surface of the cylinder.

4. The device for rapid quantitative detection of acid value in frying oil according to claim 1, characterized in that, The magnetic components of the rotation drive are two independent magnets, which are arranged in a straight line and are magnetically opposite at their closest points; the magnetic components on the stirring rod are also two independent magnets, and each magnet is parallel to the corresponding magnet on the rotation drive.

5. The device for rapid quantitative detection of acid value in frying oil according to claim 1, characterized in that, The rotation drive also includes a motor, a battery, and a switch, with the motor connected to the battery via the switch.

6. The device for rapid quantitative detection of acid value in frying oil according to claim 5, characterized in that, The switch is located at the end of the push rod furthest from the piston.

7. The device for rapid quantitative detection of acid value in frying oil according to claim 1, characterized in that, The device for detecting the acid value of frying oil is also equipped with a container A containing an oil sample solvent and a colorimetric agent, and a container B containing a sodium hydroxide solution. Containers A and B are set up independently.

Images