A sample pretreatment device for determining peroxide value in food

Abstract

This invention belongs to the technical field of food testing devices, and specifically relates to a sample pretreatment device for determining the peroxide value in food. It includes a filtrate cup with an upper conical hole that fits tightly with the lower conical part of a funnel. A horizontally welded support ring is located on the lower inner diameter of the funnel, a wave spring ring is placed on the support ring, a filter paper support is placed on the wave spring ring, and filter paper is placed on the filter paper support. The filter paper is held by the lower end of a sieve support frame. Two constriction platforms are respectively provided on the inner wall of the sieve support frame; a secondary sieve is placed on the lower constriction platform, and a primary sieve is placed on the upper constriction platform. The outer surface of the upper conical part of the sieve support frame fits tightly with the inner surface of the upper conical hole of the funnel, and the inner surface of the upper conical hole of the sieve support frame fits tightly with the conical part of the lower connecting pipe of the valve body. The upper end of the lower connecting pipe of the valve body is connected to an extraction container by a butterfly valve, and the upper end of the butterfly valve of the extraction container is connected to the upper connecting pipe of the valve body. The upper conical hole of the upper connecting pipe of the valve body contacts the upper cover, and both have the same taper.

Description

Technical Field

[0001] This invention belongs to the technical field of food testing devices, and specifically relates to a sample pretreatment device for determining the peroxide value in food. Background Technology

[0002] Before determining the peroxide value of edible animal and vegetable oils and edible oil products, foods made from plant-based foods such as wheat flour, grains, and nuts through processing techniques such as frying, puffing, baking, seasoning, and stir-frying, and foods made from animal-based foods through processing techniques such as quick-freezing, drying, and pickling, the edible samples must first undergo pretreatment. The pulverized sample is placed in a wide-mouthed bottle containing a certain volume of petroleum ether and allowed to stand for at least 12 hours for extraction. Then, the petroleum ether in the wide-mouthed bottle, along with the pulverized sample, is poured into a funnel containing anhydrous sodium sulfate for filtration. The filtrate is then evaporated under reduced pressure to dryness, and the residue is the test sample. Because petroleum ether has a low boiling point of only 30℃ and is flammable, its vapor can explode when mixed with air. Petroleum ether vapor or mist is irritating to the eyes, mucous membranes, and respiratory tract, and can damage the nervous system. Therefore, the process of slowly pouring petroleum ether along with food fragments from a wide-mouth bottle into a funnel for filtration is carried out in a fume hood. Even so, it inevitably poses a certain risk of injury to operators, as the operation requires close and prolonged contact, and sometimes petroleum ether may splash outside the funnel. Thus, the currently used equipment and operating methods are not conducive to protecting the health of operators, and the "filtration" quality and operational efficiency are low. Food testing institutions conduct a huge number of food tests daily, and the currently used wide-mouth bottles, funnels, and other glassware are fragile during cleaning. Using disposable PP plastic containers is too costly, and there is currently no suitable solution for this problem. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a sample pretreatment device for determining the peroxide value in food. This eliminates the need for inspectors to pour petroleum ether along with crushed samples into the funnel, thus protecting the health of operators while improving the quality and efficiency of extraction and filtration.

[0004] This invention is achieved through the following technical solution:

[0005] A sample pretreatment device for determining the peroxide value in food includes a filtrate cup with an upper conical hole that fits snugly with the lower cone of a funnel, the funnel having the same taper. A horizontally welded support ring is mounted on the lower inner diameter of the funnel, a wave spring ring is placed on the support ring, a filter paper support is placed on the wave spring ring, and filter paper is placed on the filter paper support. The filter paper is held by the lower end of a screen holder. Two diameter-reducing platforms are respectively provided along the height direction of the inner wall of the screen holder, with the lower platform housing a hole with a diameter of 0. A 40-mesh secondary sieve with a diameter of 0.45mm is used. A primary sieve with a diameter of 18.0mm is placed on the upper reducing platform. The outer surface of the upper cone of the sieve support closely fits the inner surface of the upper cone hole of the funnel. The inner surface of the upper cone hole of the sieve support closely fits the cone part of the lower pipe of the valve body. The upper end of the lower pipe of the valve body is equipped with a sealing gasket and is connected to the butterfly valve of the extraction container by bolts. The upper end of the butterfly valve of the extraction container is also equipped with a sealing gasket and is connected to the upper pipe of the valve body by bolts. The upper cone hole of the upper pipe of the valve body contacts the upper cover, and the two have the same taper.

[0006] Furthermore, the upper cover is provided with a first opening, and a venting butterfly valve is fixed above the first opening by bolts. A stainless steel washer is provided on the top of the venting butterfly valve A, and a ferrite washer is placed on the upper surface of the stainless steel washer. The stainless steel washer and the ferrite washer are fixed to the top of the venting butterfly valve by hexagonal bolts. The inner diameter of the ferrite washer is larger than the inner diameter of the stainless steel washer. A ventilation filter is placed on the upper surface of the stainless steel washer, and the thickness of the ventilation filter is smaller than the thickness of the ferrite washer. Four positioning cone holes of the same diameter are evenly distributed on the upper surface of the ferrite washer. The four positioning cone holes can closely engage with the four positioning cones evenly distributed on the permanent magnet ring. The inner diameter of the permanent magnet ring is the same as the inner diameter of the stainless steel washer, and the outer diameter of the permanent magnet ring is larger than the outer diameter of the ferrite washer.

[0007] Furthermore, the butterfly valve for the extraction container is provided with a valve core for the container in the middle, and a valve handle for the container is provided on one side of the valve core for the container.

[0008] The venting butterfly valve has a venting valve core in the middle, and a venting valve handle is provided on one side of the venting valve core A.

[0009] Furthermore, the shaft end of the venting valve core is connected to coupling A, and the other end of coupling A is connected to the shaft of underwater servo motor A. The underwater servo motor A is fixed to bracket A by bolts, and bracket A is fixed to the outer side of the venting butterfly valve by bolts.

[0010] The valve core of the container is connected to a coupling B at one end, and an underwater servo motor B is connected to the other end of the coupling B. The underwater servo motor B is fixed to a bracket B by bolts, and the bracket B is fixed to the side of the butterfly valve for the extraction container by bolts.

[0011] Furthermore, the upper cover is provided with a second opening, and a waterproof ultrasonic liquid level sensor is installed above the second opening by bolts.

[0012] Furthermore, a ferrite circular steel plate is fixed to the upper cover by bolts. Four conical holes B are evenly distributed on the ferrite circular steel plate with the center as a reference and the same diameter. Positioning cones B are inserted into the conical holes B. The positioning cones B are evenly distributed on the permanent magnet disk. A pressure sensor A is fixed at the center of the upper surface of the permanent magnet disk. The upper surface of the pressure sensor A is fixed to the lower surface of the flange by bolts. The center of the upper surface of the flange is fixed to the center of the telescopic end. The telescopic end is controlled by an electric cylinder and a servo motor C. The electric cylinder and the servo motor C are fixed to the lower surface of the horizontal plate by bolts. A reinforcing rib is provided on the upper surface of the horizontal plate. The horizontal plate and the reinforcing rib are welded to the upper part of the column. The lower end of the column and the reinforcing rib plate are welded together to the base plate. The base plate is fixed to the worktable surface by bolts.

[0013] Furthermore, a display PLC controller and a miniature negative pressure pump are placed on the workbench surface. A pressure sensor B and a solenoid valve are installed at the upper end of the negative pressure pipeline of the miniature negative pressure pump. The other end of the solenoid valve is connected to the negative pressure pipe. One end of the negative pressure pipe is connected to the male end of a quick-connect air connector. The female end of the quick-connect air connector is fixed on the opening on the side wall of the filtrate cup.

[0014] Furthermore, the bottom of the funnel is provided with a funnel outlet, which is lower than the opening for installing the female end of the quick-connect air connector.

[0015] The beneficial technical effects of this invention are as follows: This invention eliminates the need for testing personnel to pour the petroleum ether and food fragments after 12 hours of extraction into the funnel, greatly reducing and preventing potential health hazards caused by close contact with petroleum ether volatilization. It also improves the quality and efficiency of extraction and filtration. The reusable containers in the device are made of medical-grade stainless steel, and the same parts in each set of filtration devices are interchangeable, improving cleaning efficiency and solving the problems of fragile glassware during cleaning and the high cost of using disposable PP plastic containers. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front sectional view of Embodiment 1 of the present invention;

[0018] Figure 2 yes Figure 1Top view;

[0019] Figure 3 yes Figure 1 middle Enlarged view of the part;

[0020] Figure 4 yes Figure 1 Filtering state diagram;

[0021] Figure 5 yes Figure 4 Filtration complete, filtrate removed (state diagram);

[0022] Figure 6 yes Figure 1 Schematic diagram of the structure and installation steps of each part;

[0023] Figure 7 This is a top view of the filter paper tray;

[0024] Figure 8 This is a top view of a stainless steel corrugated spring coil;

[0025] Figure 9 This is a front view of Embodiment 2 of the present invention;

[0026] Figure 10 yes Figure 9 middle Enlarged view of the part;

[0027] Figure 11 yes Figure 10 Filtering state diagram;

[0028] Figure 12 yes Figure 10 Image showing the state after the vessel has been removed;

[0029] Figure 13 yes Figure 10 Filtration complete, filtrate removed (state diagram);

[0030] Figure 14 yes Figure 9 A schematic diagram of the structure and installation steps of the vessel;

[0031] Figure 15 This is a top view of the top cover in Embodiment 2;

[0032] Figure 16 This is the electrical control schematic diagram of Example 2;

[0033] In the diagram: 1. Filtration cup; 2. Upper conical hole of the filtration cup; 3. Funnel; 4. Lower cone; 5. Support ring; 6. Wave spring ring; 7. Filter paper support; 8. Filter paper; 9. Screen support; 10. Reduction platform; 11. Secondary sieve; 12. Primary sieve; 13. Lower valve body connector; 14. Sealing gasket; 15. Butterfly valve for extraction container; 16. Upper valve body connector; 17. Top cover; 18. Ventilation butterfly valve; 19. Stainless steel gasket; 20. Ferritic gasket; 21. Ventilation filter; 22. Permanent magnet ring; 23. Valve core for container; 24. Container valve handle; 25. Ventilation valve core; 26. Ventilation valve handle; 27. Coupling A. 28. Underwater servo motor A; 29. ​​Bracket A; 30. Coupling B; 31. Underwater servo motor B; 32. Bracket B; 33. Waterproof ultrasonic level sensor; 34. Ferritic round steel plate; 35. Permanent magnet disk; 36. Pressure sensor A; 37. Flange; 38. Electric cylinder; 39. Servo motor C; 40. Horizontal plate; 41. Column; 42. Base plate; 43. Workbench surface; 44. Display PLC controller; 45. Miniature negative pressure pump; 46. Pressure sensor B; 47. Solenoid valve; 48. Negative pressure pipe; 49. Quick-connect female air connector; 50. Quick-connect male air connector; 51. Positioning ring. Detailed Implementation

[0034] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] Example 1

[0039] See Figure 1-8 A sample pretreatment device for determining the peroxide value in food includes a filtrate cup 1, which is placed on a workbench surface 43. The upper part of the filtrate cup 1 has an upper conical hole 2, which is tightly fitted with the lower cone 4 of a funnel 3 with the same taper. A support ring 5 is horizontally welded to the lower inner diameter of the funnel 3. A wave spring coil 6 is placed on the support ring 5, a filter paper 8 support mesh 7 is placed on the wave spring coil 6, and filter paper 8 is placed on the filter paper 8 support mesh 7. The filter paper 8 is held by the lower end of a sieve support frame 9. Two tapering platforms 10 are respectively provided in the height direction of the inner wall of the sieve support frame 9. The lower tapering platform... Platform 10 holds a 40-mesh secondary sieve 11 with a aperture of 0.45mm. The upper reduced-diameter platform 10 holds a 18-mesh primary sieve 12 with a aperture of 1.0mm. The outer surface of the upper cone of the sieve support 9 closely fits the inner surface of the upper cone hole of the funnel 3. The inner surface of the upper cone hole of the sieve support 9 closely fits the cone part of the lower valve body pipe 13. The upper end of the lower valve body pipe 13 is fitted with a sealing gasket 14 and connected to the butterfly valve 15 of the extraction container by bolts. The upper end of the butterfly valve 15 of the extraction container is also fitted with a sealing gasket 14 and connected to the upper valve body pipe 16 by bolts. The upper cone hole of the upper valve body pipe 16 contacts the upper cover 17, and the two have the same taper.

[0040] In this embodiment, an opening is provided in the center of the upper cover 17A. A venting butterfly valve 18 is fixed above the opening by bolts. A stainless steel washer 19 is provided on the top of the venting butterfly valve 18, and a ferrite washer 20 is placed on the upper surface of the stainless steel washer 19. The two are fixed to the top of the venting butterfly valve 18 by hexagonal bolts. The inner diameter of the ferrite washer 20 is larger than the inner diameter of the stainless steel washer 19. A ventilation filter 21 is placed on the upper surface of the stainless steel washer 19. The thickness of the ventilation filter 21 is smaller than the thickness of the ferrite washer 20. Four positioning cone holes of the same diameter are evenly distributed on the upper surface of the ferrite washer 20. These four positioning cone holes can closely engage with the four positioning cones evenly distributed on the permanent magnet ring 22. The inner diameter of the permanent magnet ring 22 is the same as the inner diameter of the stainless steel washer 19, and the outer diameter of the permanent magnet ring 22 is slightly larger than the outer diameter of the ferrite washer 20. This facilitates the removal of the permanent magnet ring 22 to replace the ventilation filter 21. (See attached figure) Figure 3 The venting butterfly valve 18 is also the handle of the top cover 17.

[0041] In this embodiment, the extraction state after installation is shown in the attached figure. Figure 1A certain amount of petroleum ether is placed in the volume formed by the valve core 23 of the butterfly valve 15 and the valve body 16. The food sample is placed in the top cover 17, and then the top cover 17 is closed. After standing for 12 hours, the vent valve handle 26 is rotated 90°, and the container valve handle 24 is rotated 90°. At this time, the extracted liquid falls through the 1.0mm 18-mesh primary sieve 12, the 0.45mm 40-mesh secondary sieve 11, and the filter paper 8 to reach the filtrate cup 1. The state of the filtrate is shown in the attached diagram. Figure 4 After filtration is complete, simply lift the funnel 3 by holding it up, place the top cover 17 on the filtrate cup 1, and turn the vent valve handle 26 to the horizontal position (see attached). Figure 5 Other components can be cleaned; diagrams of the structure and installation steps for each part are attached. Figure 6 The consistent contact taper ensures a tight seal and facilitates easy assembly and disassembly. The filter paper 8 and screen 7 are included to facilitate filter paper 8 replacement and prevent movement and damage (see attached). Figure 7 The soft wave spring coil 6 is installed to ensure that the lower end of the screen support 9 can hold the filter paper 8 while also ensuring tight contact between the upper conical hole of the funnel 3 and the upper outer cone of the screen support 9 (see attached). Figure 4 and attached Figure 8 .

[0042] Example 2

[0043] See Figure 9-16A sample pretreatment device for determining the peroxide value in food mainly consists of: a positioning ring 51, a micro negative pressure pump 45, a display PLC controller 44, a column 41, an electric cylinder 38, an underwater servo motor A28, an underwater servo motor B31, a waterproof ultrasonic level sensor 33, a pressure sensor A36, a filtrate cup 1, a wave spring ring 6, a funnel 3, a screen support 9, a butterfly valve 15 for extraction containers, and a venting butterfly valve 18. The positioning ring 51 is fixed to the workbench surface 43 by bolts. The filtrate cup 1 is placed inside the positioning ring 51. The upper conical hole of the filtrate cup 1 is tightly fitted with the lower conical body 4 of the funnel 3, and their tapers are the same. A support ring 5 is horizontally welded on the lower inner diameter of the funnel 3. A wave spring ring 6 is placed on the support ring 5, and a filter paper 8 and a screen 7 are placed on the wave spring ring 6. Filter paper 8 is placed on screen 7 and held by screen bracket 9. Two narrowing platforms 10 are set on the inner wall of screen bracket 9 in the height direction. The lower narrowing platform 10 holds a 40-mesh secondary screen 11 with an aperture of 0.45mm and the upper narrowing platform 10 holds a 18-mesh primary screen 12 with an aperture of 1.0mm. The outer surface of the upper cone of screen bracket 9 is in close contact with the inner surface of the upper cone hole of funnel 3. The inner surface of the upper cone hole of screen bracket 9 is in close contact with the cone part of valve body lower pipe 13. A sealing gasket 14 is installed at the upper end of valve body lower pipe 13 and connected to butterfly valve 15 for extraction container by bolts. The shaft end of valve core 23 for container is connected to coupling B30. The other end of coupling is connected to underwater servo motor B31. Underwater servo motor B31 is fixed to bracket B32 by bolts. Bracket B32 is fixed to the side of butterfly valve 15 for extraction container by bolts. The upper end of the butterfly valve 15 of the extraction container is fitted with a sealing gasket 14 and connected to the upper pipe 16 of the valve body by bolts. The upper tapered hole of the upper pipe 16 of the valve body has the same taper as the contact surface of the upper cover 17.

[0044] In this embodiment, a hole is provided on the upper cover 17, and a venting butterfly valve 18 is fixed above the hole by bolts. The top structure of the venting butterfly valve 18 is the same as that in the first embodiment 1, and will not be described again here. The shaft end of the venting valve core 25 is connected to the coupling A27, and the other end of the coupling A27 is connected to the shaft of the underwater servo motor A28. The underwater servo motor A28 is fixed to the bracket A29 by bolts, and the bracket A29 is fixed to the outer side of the venting butterfly valve 18 by bolts.

[0045] In this embodiment, the upper cover 17 is also provided with a hole, and a waterproof ultrasonic liquid level sensor 33 is installed above the hole by bolts.

[0046] In this embodiment, a ferrite circular steel plate 34 is bolted to the center of the upper surface of the cover 17B. Four conical holes of the same diameter are evenly distributed on the ferrite circular steel plate 34, with the center as the reference point. Positioning cones can be inserted into these conical holes. The positioning cones are evenly distributed on a permanent magnet disk 35. A pressure sensor A36 is fixed to the center of the upper surface of the permanent magnet disk 35. The upper surface of the pressure sensor A36 is bolted to the lower surface of the flange 37. The center of the upper surface of the flange 37 is fixed to the center of the telescopic end. The electric cylinder 38 and the servo motor C39 are bolted to the lower surface of the horizontal plate 40. The upper surface of the horizontal plate 40 is provided with reinforcing ribs. The horizontal plate 40 and the reinforcing ribs are welded to the upper part of the column 41. The lower end of the column 41 and the reinforcing rib plate are welded together to the base plate 42. The base plate 42 is bolted to the worktable surface 43. The vertical center line of the positioning ring 51 on the worktable surface 43 is coaxial with the vertical center lines of the valve body upper pipe 16, the cover 17B, and the telescopic end.

[0047] In this embodiment, a display PLC controller 44 and a miniature negative pressure pump 45 are placed on the workbench surface 431. A pressure sensor B46 and a solenoid valve 47 are installed at the upper end of the negative pressure pipe 48 of the miniature negative pressure pump 45. The other end of the solenoid valve 47 is connected to the negative pressure pipe 48, and the other end of the negative pressure pipe 48 is connected to the male end 50 of the quick-connect air connector. The female end 49 of the quick-connect air connector is fixed to an opening on the upper side wall of the filtrate cup 1. The male end 50 and the female end 49 of the quick-connect air connector are both open and closed at both ends. That is, when the male end of the air connector is inserted into the female end 85, its internal ring returns to its original position under the action of the spring, and the steel ball rolls to lock the male body tightly connected. At the same time, the valves of the female and male bodies push each other open, allowing fluid to flow. The O-ring can completely block fluid leakage. (See attached diagram) Figure 11 When the male end of the air connector is pulled out from the female end to disconnect the connection, the sleeve of the female connector moves to the other end, and the stainless steel ball automatically rolls outward. The male connector disconnects due to the combined valve spring force of the male and female connectors, and the valves of both the male and female connectors close instantly, momentarily stopping fluid flow. See the attached document for usage instructions. Figure 13 The male end 50 and the female end 49 of the quick-connect air coupling are standard parts.

[0048] In this embodiment, the electrical control wires of the miniature negative pressure pump 45, solenoid valve 47, pressure sensor A36, pressure sensor B46, waterproof ultrasonic level sensor 33, servo motor C39, underwater servo motor A28, and underwater servo motor B31 are all wired or wirelessly connected to the display PLC controller 44. The PLC controller 44 is input with control programs, such as the pressure value ranges of pressure sensors A36 and B46, the alarm level of the waterproof ultrasonic level sensor 33, and the working requirements of each servo motor. The PLC controller 44 can also input self-learning and adaptive programs and connect to a network.

[0049] In this embodiment, the device is installed and ready to operate as shown in the attached diagram. Figure 9 When in use, pressing the "Open Cover" button on the PLC controller 44 causes the servo motor C39 to shorten, moving the upper cover 17 and all components fixed to it vertically upwards. After placing a certain amount of petroleum ether and food crumbs into the valve body upper pipe 16, pressing the "Extraction" button on the PLC controller 44 activates all electrical components. The PLC controller then controls the servo motor C39 to extend, moving the upper cover 17 and all components fixed to it vertically downwards. When the outer diameter cone of the upper cover 17 contacts the upper cone hole of the valve body upper pipe 16, the pressure value transmitted from the pressure sensor to the PLC controller increases. When the programmed value is reached... The PLC controller then stops the servo motor C39 and maintains the pressure value. Simultaneously, the PLC controller starts a timer. Once the time is reached, the "filtrate" operation begins according to the programmed settings. The PLC controller controls the micro negative pressure pump 45 to ensure the pressure value of the pressure sensor A36 matches the programmed range. The PLC controller opens the solenoid valve 47 to the conducting state and activates the underwater servo motors A28 and B31, causing the ventilation valve core 25 and the container valve core 23 to rotate to the programmed angle. Because the outlet of funnel 3 is under negative pressure and is far from and below the opening of the quick-connect vent female end 49, the filtrate will not be sucked into the negative pressure pipe 48. The extract at the valve body's upper pipe 16, under the influence of gravity and negative pressure, passes through a 1.0mm 18-mesh primary sieve 12B, a 0.45mm 40-mesh secondary sieve 11B, and filter paper 8B, reaching the filtrate cup 1B (see attached image). Figure 11 .

[0050] When the liquid level height transmitted by the waterproof ultrasonic level sensor 33 to the PLC controller drops to the programmed value, the PLC controller controls the underwater servo motor A28 to work in reverse, causing the venting valve core 25 of the venting butterfly valve 18 to return to the closed state, controlling the micro negative pressure pump 45 to stop working, and controlling the solenoid valve 47 to switch from the open state to the closed state. The display PLC controller 44 issues an audio-visual prompt of "Filtration complete" and sends a prompt message to the central control center and the mobile phone of the testing operator. Before removing the "filtrate", the testing operator presses the "Open Cover" button on the display PLC controller 44. The working extension end of the servo motor C394 shortens, causing the cover 17 to move vertically upward. At this time, the funnel 3 can be held and lifted to remove the upper part for cleaning. Hold the venting butterfly valve 18 and press down the cover 17 to overcome the attraction of the permanent magnet disk 35, place the cover 17 on the filter cup 1, pull out the male end of the air connector, and then remove the filter cup 1 (see attached). Figure 12 and attached Figure 13 .

[0051] This device eliminates the need for testing personnel to slowly pour the petroleum ether and food fragments sample after 12 hours of extraction into funnel 3, greatly reducing and preventing potential health hazards caused by close contact with petroleum ether volatilization. The extraction and filtration quality and efficiency are improved. The containers are made of medical-grade stainless steel, and the same parts in each set of filtration devices are interchangeable, improving cleaning efficiency.

Claims

1. A sample pretreatment device for determining the peroxide value in food, characterized in that: The device includes a filtrate cup (1), with an upper conical hole (2) on the upper part of the filtrate cup (1). The upper conical hole (2) of the filtrate cup is tightly fitted with the lower cone (4) of the funnel (3) and has the same taper. A horizontal support ring (5) is welded on the lower inner diameter of the funnel (3). A wave spring ring (6) is placed on the support ring (5). A filter paper (8) support net (7) is placed on the wave spring ring (6). Filter paper (8) is placed on the filter paper (8) support net (7). The filter paper (8) is held by the lower end of the sieve support frame (9). Two diameter reduction platforms (10) are respectively provided in the height direction of the inner wall of the sieve support frame (9). The lower diameter reduction platform (10) is used to place a 40-mesh secondary sieve (11) with a diameter of 0.425mm. The upper diameter reduction platform (10) is used to place a 1.0mm diameter secondary sieve. The 18-mesh primary sieve (12) has an upper conical outer surface that closely matches the upper conical inner surface of the funnel (3), and an upper conical inner surface that closely matches the conical part of the valve body lower pipe (13). The valve body lower pipe (13) is fitted with a sealing gasket (14) at its upper end and connected to the extraction container butterfly valve (15) by bolts. The extraction container butterfly valve (15) is also fitted with a sealing gasket (14) at its upper end and connected to the valve body upper pipe (16) by bolts. The upper conical hole of the valve body upper pipe (16) contacts the upper cover (17) and the two have the same taper. The top cover (17) has a first opening, and a venting butterfly valve (18) is fixed above the first opening by bolts. A stainless steel washer (19) is provided on the top of the venting butterfly valve (18), and a ferrite washer (20) is placed on the upper surface of the stainless steel washer (19). The stainless steel washer (19) and the ferrite washer (20) are fixed to the top of the venting butterfly valve (18) by hexagonal bolts. The inner diameter of the ferrite washer (20) is larger than the inner diameter of the stainless steel washer (19). A ventilation filter (21) is placed on the upper surface of the stainless steel washer (19). The thickness of the ventilation filter (21) is less than that of the ferrite washer (20). Four positioning cone holes are evenly distributed on the upper surface of the ferrite washer (20) with the same diameter. The four positioning cone holes can be closely attracted to the four positioning cones evenly distributed on the permanent magnet ring (22). The inner diameter of the permanent magnet ring (22) is the same as that of the stainless steel washer (19). The outer diameter of the permanent magnet ring (22) is greater than that of the ferrite washer (20). The sample pretreatment device for determining peroxide value in food also includes a display PLC controller (44) and a micro negative pressure pump (45). The upper end of the negative pressure pipe (48) of the micro negative pressure pump (45) is equipped with a pressure sensor B (46) and a solenoid valve (47). The other end of the solenoid valve (47) is connected to the negative pressure pipe (48). One end of the negative pressure pipe (48) is connected to the male end (50) of the quick gas connector. The female end (49) of the quick gas connector is fixed on the opening on the side wall of the filter cup (1).

2. The sample pretreatment device for determining peroxide value in food according to claim 1, characterized in that: The extraction container butterfly valve (15) is provided with a container valve core (23) in the middle, and a container valve handle (24) is provided on one side of the container valve core (23). The ventilation butterfly valve (18) has a ventilation valve core (25) in the middle, and a ventilation valve handle (26) is provided on one side of the ventilation valve core (25).

3. The sample pretreatment device for determining peroxide value in food according to claim 2, characterized in that: The shaft end of the ventilation valve core (25) is connected to the coupling A (27), and the other end of the coupling A (27) is connected to the shaft of the underwater servo motor A (28). The underwater servo motor A (28) is fixed to the bracket A (29) by bolts, and the bracket A (29) is fixed to the outer side of the ventilation butterfly valve (18) by bolts. The valve core (23) for the container is connected to a coupling B (30) at one end, and the other end of the coupling B (30) is connected to an underwater servo motor B (31). The underwater servo motor B (31) is fixed to a bracket B (32) by bolts, and the bracket B (32) is fixed to the side of the butterfly valve (15) for the extraction container by bolts.

4. The sample pretreatment device for determining peroxide value in food according to claim 3, characterized in that: The upper cover (17) is provided with a second opening, and a waterproof ultrasonic liquid level sensor (33) is installed above the second opening by bolts.

5. The sample pretreatment device for determining peroxide value in food according to claim 3, characterized in that: A ferrite circular steel plate (34) is fixed to the upper cover (17) by bolts. The ferrite circular steel plate (34) has four conical holes B evenly distributed on the same diameter with the center as the reference. A positioning cone B is inserted into the conical hole B. The positioning cones B are evenly distributed on the permanent magnet disk (35). A pressure sensor A (36) is fixed at the center of the upper surface of the permanent magnet disk (35). The upper surface of the pressure sensor A (36) is fixed to the lower surface of the flange (37) by bolts. The center of the upper surface of the flange (37) is fixed to the extension. At the center of the retractable end, the telescopic end is controlled by an electric cylinder (38) and a servo motor C (39). The electric cylinder (38) and the servo motor C (39) are fixed to the lower surface of the horizontal plate (40) by bolts. The upper surface of the horizontal plate (40) is provided with reinforcing ribs. The horizontal plate (40) and the reinforcing ribs are welded to the upper part of the column (41). The lower end of the column (41) and the reinforcing rib plate are welded together to the base plate (42). The base plate (42) is fixed to the workbench surface (43) by bolts.

6. The sample pretreatment device for determining the peroxide value in food according to claim 1, characterized in that: The bottom of the funnel (3) is provided with a funnel (3) outlet, and the funnel (3) outlet is lower than the opening for installing the quick air connector female end (49).

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