Food pretreatment device for food detection

Abstract

The invention relates to the field of food detection, in particular to a food pretreatment device for food detection, which comprises a pulverizer communicated with a concentrator; the concentrator comprises a machine shell, a middle shaft and a heater are fixedly connected to the machine shell, the middle shaft is transversely arranged, a liquid injection channel is formed in the middle shaft, the middle shaft is sleeved with a tank body, the pulverizer is communicated with the tank body through the liquid injection channel, and the tank body is provided with a driving part which is used for driving the tank body to rotate with the middle shaft as the center and changing a heating point. A first telescopic rod is fixedly connected to the bottom of the center shaft, an elastic telescopic scraper is arranged at the end, away from the center shaft, of the first telescopic rod, and a liquid level sensor is arranged at the bottom of the elastic telescopic scraper; and the controller is used for obtaining liquid level information detected by the liquid level sensor and controlling the first telescopic rod to stretch out and draw back, so that the elastic telescopic scraping plate is located at the preset height of the liquid level in the tank body. By adopting the technical scheme of the invention, solid impurities in the concentration process are treated, and better concentration efficiency is kept.

Description

Technical Field

[0001] This invention relates to the field of food testing, and more specifically to a food pretreatment device for food testing. Background Technology

[0002] In the field of food testing, sample pretreatment is a crucial step in ensuring the accuracy and reliability of test results. Traditional pretreatment methods often rely on manual operation or semi-automated equipment, involving steps such as crushing, homogenization, filtration, extraction, and concentration, which suffer from problems such as low efficiency, cumbersome operation, and susceptibility to cross-contamination.

[0003] The purpose of extraction and concentration steps is to increase the proportion of the target analyte, thereby reducing the sensitivity requirements of the detection sensor. In the concentration step, drying is often used to increase the analyte content. However, food contains heat-sensitive components such as proteins, which are prone to spoilage or the formation of solid impurities during concentration, affecting the concentrated product and making cleaning difficult. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a food pretreatment device for food testing, used to treat solid impurities during the concentration process and maintain better concentration efficiency.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a food pretreatment device for food testing, comprising a pulverizer connected to a concentrator;

[0006] The concentrator includes a housing, on which a central shaft and a heater are fixedly connected. The central shaft is placed horizontally and has a liquid injection channel inside. A tank is fitted over the central shaft. The pulverizer is connected to the tank through the liquid injection channel. The tank is equipped with a drive unit. The heater is used to heat the side wall of the tank at a fixed point. The drive unit is used to drive the tank to rotate around the central shaft and change the heating point. A first telescopic rod is fixedly connected to the bottom of the central shaft. An elastic telescopic scraper is provided at the end of the first telescopic rod away from the central shaft. A liquid level sensor is provided at the bottom of the elastic telescopic scraper.

[0007] It also includes a controller, which is used to acquire the liquid level information detected by the liquid level sensor and control the extension and retraction of the first telescopic rod so that the elastic telescopic scraper is located at a preset height on the liquid surface inside the tank.

[0008] The above approach has the following beneficial effects:

[0009] 1. In this solution, the pulverizer is used to generate a sample liquid for food. The sample liquid flows into the tank through the injection channel for concentration. The concentration principle is to evaporate the liquid in the sample liquid by heating it with a heater. Because the central shaft is placed horizontally and the tank is fitted onto the central shaft, the sample liquid, after entering the tank, will accumulate at the bottom of the arc-shaped side wall of the tank under the action of gravity. When the drive unit drives the tank to rotate, the sample liquid is still located at the bottom of the arc-shaped side wall of the tank, but the arc-shaped side wall of the tank that is not submerged will be evenly coated with the sample liquid. This not only increases the evaporation area, but also makes the heat conduction path of the sample liquid on the unsubmerged arc-shaped side wall shorter, which can significantly enhance the concentration efficiency.

[0010] 2. In this scheme, since the sample liquid is evenly coated on the unsubmerged arc-shaped sidewalls of the tank, enhancing evaporation efficiency, the main area where solid impurities are generated is also the unsubmerged arc-shaped sidewalls. The elastic telescopic scraper can remove the generated solid impurities. Since the tank is constantly rotating, the elastic telescopic scraper can remove all solid impurities on the unsubmerged arc-shaped sidewalls without moving.

[0011] 3. In this scheme, as concentration proceeds, the height of the sample liquid at the bottom of the arc-shaped sidewall of the tank decreases, increasing the area of ​​the unsubmerged arc-shaped sidewall. At this point, the elastic scraper removes solid impurities and sample liquid adhering to the sidewall along with the sample. As the scraped-off arc-shaped sidewall moves to the bottom of the tank and is submerged by the sample liquid, the unattached sample liquid evaporates, reducing the overall evaporation efficiency. Furthermore, as concentration continues, the area of ​​unattached sample liquid evaporating increases significantly, substantially affecting the evaporation process.

[0012] The liquid level sensor can detect changes in the sample liquid height, and under the control of the controller on the first telescopic rod, the elastic telescopic scraper is lowered. The elastic telescopic scraper will adapt to the area change caused by the arc convergence based on elastic deformation, so that the distance between the elastic telescopic scraper and the sample liquid surface at the bottom of the arc side wall of the tank is always controlled at a preset value, thereby maintaining the evaporation efficiency and reducing the impact of the elastic telescopic scraper on the evaporation efficiency.

[0013] Furthermore, a one-way valve is installed in the liquid injection channel, and a gas pressure control channel is installed in the central axis. The end of the gas pressure control channel away from the tank body is connected to a negative pressure suction device, which is used to reduce the gas pressure inside the tank and remove the gas generated after the liquid inside the tank is vaporized.

[0014] Beneficial effects: Lower air pressure leads to a lower boiling point. When a liquid evaporates, it generates vapor pressure. When this vapor pressure equals the external pressure, the liquid boils; this temperature is the liquid's boiling point. When the external pressure decreases, the lower temperature allows the vapor pressure to equalize with the external pressure, achieving boiling. A negative pressure suction device can lower the boiling point of the liquid inside the tank while simultaneously removing the gas produced by liquid vaporization.

[0015] Furthermore, a condenser is provided at the end of the negative pressure absorber away from the central axis, and a collection container is connected to the bottom of the condenser.

[0016] Beneficial effects: The condenser can condense the gas produced by the vaporization of liquid, thereby reducing it back to liquid and collecting it in a collection container.

[0017] Furthermore, the heater is a water bath heating pot.

[0018] Beneficial effects: The water bath heating pot can provide a stable temperature and can evenly heat the curved surface of the tank.

[0019] Furthermore, the end of the first telescopic rod away from the central axis is connected to the elastic telescopic scraper via the second telescopic rod. The controller is used to control the extension and retraction of the second telescopic rod based on the extension and retraction amount of the first telescopic rod, so that the elastic telescopic scraper abuts against the side wall of the tank.

[0020] Beneficial effects: The elastic telescopic scraper can adapt to the area change caused by the arc convergence by extending and retracting the second telescopic rod, which can have a larger range of adaptation and make the pressure generated between the elastic telescopic scraper and the side wall of the tank more stable.

[0021] Furthermore, both the elastic telescopic scraper and the second telescopic rod are tilted at a preset angle relative to the liquid level inside the tank.

[0022] Beneficial effects: The elastic telescopic scraper removes solid impurities along with the attached sample liquid. The solid impurities, due to their fluidity, flow away from the scraper and back into the sample liquid at the bottom of the tank's curved sidewall. The tilt of the elastic telescopic scraper and the second telescopic rod further facilitates the return of the scraped sample liquid to the sample liquid at the bottom of the tank's curved sidewall.

[0023] Furthermore, the elastic telescopic scraper includes a plate body, and an elastic shovel is provided at the end of the plate body away from the second telescopic rod.

[0024] Beneficial effects: The flexible spade can adapt to the contact changes caused by the curvature, and the plate body can provide a certain degree of rigidity.

[0025] Furthermore, a leakage groove is provided on the plate, and a first filter screen is provided inside the leakage groove.

[0026] Beneficial effects: Because the elastic telescopic scraper is tilted, the sample liquid will flow to the first filter screen in the leakage tank, filtering out solid impurities mixed in the sample liquid.

[0027] Furthermore, a second filter screen is installed at the connection between the liquid injection channel and the pulverizer.

[0028] Beneficial effect: The second filter screen is used to filter out food residue produced after the grinder has pulverized the food.

[0029] Furthermore, the controller is used to calculate the concentration ratio of the liquid inside the tank based on the extension and retraction of the first telescopic rod.

[0030] Beneficial effect: The first telescopic rod always controls the elastic telescopic scraper to be at a preset height on the liquid surface inside the tank. Therefore, the liquid level can be determined by the telescopic amount of the first telescopic rod.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] Figure 1 This is an isometric schematic diagram of an embodiment of the food pretreatment device for food testing according to the present invention;

[0033] Figure 2 This is a side view schematic diagram of an embodiment of the food pretreatment device for food detection according to the present invention;

[0034] Figure 3 This is a schematic cross-sectional view of the tank body of an embodiment of the food pretreatment device for food testing according to the present invention;

[0035] Figure 4 This is a cross-sectional axonometric view of the tank in an embodiment of the food pretreatment device for food testing according to the present invention.

[0036] The reference numerals in the accompanying drawings of the instruction manual include: 1. Crusher; 2. Concentrator; 3. Casing; 4. Central shaft; 5. Heater; 6. Liquid injection channel; 7. Tank; 8. Drive component; 9. First telescopic rod; 10. Second telescopic rod; 11. Elastic telescopic scraper; 12. Liquid level sensor; 13. One-way valve; 14. Air pressure control channel; 15. Negative pressure suction device; 16. Condenser; 17. Collection container; 18. Plate body; 19. Elastic shovel; 20. First filter screen; 21. Second filter screen. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0040] The following detailed description illustrates the specific implementation method:

[0041] Example 1:

[0042] As attached Figure 1-Figure 4 As shown: A food pretreatment device for food testing includes a pulverizer 1, which is connected to a concentrator 2.

[0043] The concentrator 2 includes a housing 3, on which a central shaft 4 and a heater 5 are bolted. The heater 5 is a water bath. The central shaft 4 is placed horizontally and has a liquid injection channel 6 inside. A tank 7 is fitted over the central shaft 4, and the pulverizer 1 is connected to the tank 7 through the liquid injection channel 6. A one-way valve 13 is bonded and fixed inside the liquid injection channel 6. A pressure control channel 14 is provided inside the central shaft 4. The end of the pressure control channel 14 away from the tank 7 is connected to a negative pressure absorber 15. The negative pressure absorber 15 is used to reduce the pressure inside the tank 7 and to remove the gas generated after the liquid in the tank 7 is vaporized. A condenser 16 is installed at the end of the negative pressure absorber 15 away from the central shaft 4, and a collection container 17 is connected to the bottom of the condenser 16.

[0044] The tank body 7 is equipped with a drive unit 8, which is a hollow shaft motor. The heater 5 is used to heat the side wall of the tank body 7 at a fixed point. The drive unit 8 is used to drive the tank body 7 to rotate around the central axis 4 and change the heating point. A first telescopic rod 9 is bolted to the bottom of the central axis 4. A second telescopic rod 10 is bolted to the end of the first telescopic rod 9 away from the central axis 4. An elastic telescopic scraper 11 is bonded to the end of the second telescopic rod 10 away from the first telescopic rod 9. A liquid level sensor 12 is bolted to the bottom of the elastic telescopic scraper 11.

[0045] It also includes a controller, which is used to acquire the liquid level information detected by the liquid level sensor 12 and control the extension and retraction of the first telescopic rod 9 so that the elastic telescopic scraper 11 is located at a preset height on the liquid surface inside the tank 7.

[0046] The controller has preset shape parameters of the tank body 7. The controller is used to calculate the cross-section of the tank body 7 in the plane where the second telescopic rod 10 is located based on the extension amount of the first telescopic rod 9 and input the shape parameters of the tank body 7. The controller controls the extension and retraction of the second telescopic rod 10 so that the elastic telescopic scraper 11 abuts against the side wall of the tank body 7.

[0047] The pulverizer 1 is used to generate a sample liquid from the food. The principle is to break down the food, converting it into a liquid, thereby releasing various components into the liquid environment. The resulting sample liquid flows into the tank 7 through the injection channel 6 for concentration. The concentration principle involves heating the sample liquid with the heater 5 to evaporate the liquid. Because the central shaft 4 is placed horizontally, and the tank 7 is fitted onto the central shaft 4, the sample liquid, after entering the tank 7, will accumulate at the bottom of the arc-shaped sidewall of the tank 7 under gravity. When the drive component 8 drives the tank 7 to rotate, the sample liquid remains at the bottom of the arc-shaped sidewall of the tank 7, but the unsubmerged arc-shaped sidewall of the tank 7 will be evenly coated with the sample liquid. This not only increases the evaporation area but also shortens the heat conduction path of the sample liquid on the unsubmerged arc-shaped sidewall, significantly enhancing the concentration efficiency. The condenser 16 condenses the gas generated by the vaporization of the liquid, thereby reducing it back to liquid and collecting it in the collection container 17.

[0048] The lower the air pressure, the lower the boiling point. When a liquid evaporates, it generates vapor pressure. When the vapor pressure equals the external pressure, the liquid boils; this temperature is the liquid's boiling point. When the external pressure decreases, the temperature drops, allowing the vapor pressure to equalize with the external pressure, thus reaching boiling. The negative pressure absorber 15 lowers the boiling temperature of the liquid inside the tank 7 while simultaneously removing the gas generated during liquid vaporization.

[0049] Since the sample solution is evenly coated on the unsubmerged arc-shaped sidewalls of the tank 7, enhancing evaporation efficiency, the main area where solid impurities are generated is also the unsubmerged arc-shaped sidewalls. The elastic telescopic scraper 11 can scrape off the generated solid impurities. Because the tank 7 is constantly rotating, the elastic telescopic scraper 11 can scrape off all the solid impurities on the unsubmerged arc-shaped sidewalls without moving.

[0050] As concentration proceeds, the height of the sample liquid at the bottom of the arc-shaped sidewall of tank 7 decreases, increasing the area of ​​the arc-shaped sidewall of tank 7 that is not submerged. At this point, the elastic telescopic scraper 11 scrapes off solid impurities and the sample liquid adhering to the sidewall along with the sample. This causes the scraped arc-shaped sidewall to move to the bottom of the tank 7's arc-shaped sidewall and become submerged in the sample liquid. During this process, the unattached sample liquid evaporates, reducing the overall evaporation efficiency. Furthermore, as concentration continues, the area of ​​unattached sample liquid evaporating increases significantly, substantially affecting the evaporation process.

[0051] The liquid level sensor 12 can detect changes in the sample liquid height. Under the control of the controller on the first telescopic rod 9, the elastic telescopic scraper 11 is lowered. Then, the second telescopic rod 10 drives the elastic telescopic scraper 11 to fit against the tank body 7, adapting to the area change caused by the arc convergence. This ensures that the distance between the elastic telescopic scraper 11 and the sample liquid surface at the bottom of the arc side wall of the tank body 7 is always controlled at a preset value, thereby maintaining evaporation efficiency and reducing the impact of the elastic telescopic scraper 11 on evaporation efficiency.

[0052] Example 2:

[0053] The difference from the above embodiment is that both the elastic telescopic scraper 11 and the second telescopic rod 10 are inclined at a preset angle to the liquid surface inside the tank 7. The elastic telescopic scraper 11 includes a plate body 18, and an elastic shovel 19 is provided at the end of the plate body 18 away from the second telescopic rod 10. A leakage groove is provided on the plate body 18, and a first filter screen 20 is bonded and fixed in the leakage groove.

[0054] The elastic telescopic scraper 11 scrapes away solid impurities and attached sample liquid together. Due to their fluidity, the solid impurities flow away from the elastic telescopic scraper 11 and back into the sample liquid at the bottom of the arc-shaped sidewall of the tank 7. The elastic telescopic scraper 11 is inclined relative to the second telescopic rod 10, allowing the scraped sample liquid to flow back more effectively into the sample liquid at the bottom of the arc-shaped sidewall of the tank 7. The elastic shovel 19 can adapt to the contact changes caused by the arc converging, and the plate body 18 provides a certain degree of rigidity. Because the elastic telescopic scraper 11 is inclined, the sample liquid flows towards the first filter screen 20 in the leakage tank, filtering out solid impurities mixed in with the sample liquid.

[0055] Example 3:

[0056] The difference from the above embodiment is that a second filter screen 21 is bonded and fixed at the connection between the liquid injection channel 6 and the pulverizer 1.

[0057] The second filter screen 21 is used to filter out food residues produced after the grinder 1 has pulverized the food.

[0058] Example 4:

[0059] The difference from the above embodiment is that the controller is used to calculate the concentration ratio of the liquid in the tank 7 based on the extension amount of the first telescopic rod 9.

[0060] The first telescopic rod 9 always controls the elastic telescopic scraper 11 to be located at a preset height on the liquid surface inside the tank 7. Therefore, the amount of liquid inside the tank 7 can be determined by pushing back the liquid level height through the telescopic amount of the first telescopic rod 9.

[0061] Example 5:

[0062] The difference from the above embodiment is that the injection channel 6 is also connected to an injection valve, which is used to directly inject the extraction reagent after processing the food to be tested or the solution to be concentrated again into the injection channel 6.

[0063] For some foods, it may be difficult to obtain a liquid form using the grinder 1. Therefore, the injection valve can directly inject the extraction reagent after processing the food to be tested, and then concentrate it. In addition, in some cases, secondary concentration may be required, which can also be injected directly through the injection valve without further processing by the grinder 1.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A food pretreatment device for food testing, characterized in that, Includes a pulverizer (1), which is connected to a concentrator (2); The concentrator (2) includes a housing (3), on which a central shaft (4) and a heater (5) are fixedly connected. The central shaft (4) is placed horizontally and has a liquid injection channel (6) inside. A tank (7) is fitted around the central shaft (4). The pulverizer (1) is connected to the tank (7) through the liquid injection channel (6). The tank (7) is equipped with a drive component (8). The heater (5) is used to heat the side wall of the tank (7) at a fixed point. The drive component (8) is used to drive the tank (7) to rotate around the central shaft (4) and change the heating point. A first telescopic rod (9) is fixedly connected to the bottom of the central shaft (4). An elastic telescopic scraper (11) is provided at the end of the first telescopic rod (9) away from the central shaft (4). A liquid level sensor (12) is provided at the bottom of the elastic telescopic scraper (11). It also includes a controller, which is used to acquire the liquid level information detected by the liquid level sensor (12) and control the extension and retraction of the first telescopic rod (9) so that the elastic telescopic scraper (11) is located at a preset height on the liquid surface inside the tank (7).

2. The food pretreatment apparatus for food testing according to claim 1, characterized in that, The liquid injection channel (6) is equipped with a one-way valve (13), and the central shaft (4) is equipped with a gas pressure control channel (14). The end of the gas pressure control channel (14) away from the tank (7) is connected to a negative pressure suction device (15). The negative pressure suction device (15) is used to reduce the gas pressure in the tank (7) and to remove the gas generated after the liquid in the tank (7) is vaporized.

3. The food pretreatment apparatus for food testing according to claim 2, characterized in that, The negative pressure suction device (15) is equipped with a condenser (16) at the end away from the central axis (4), and the bottom of the condenser (16) is connected to a collection container (17).

4. The food pretreatment apparatus for food testing according to claim 3, characterized in that, The heater (5) is a water bath heating pot.

5. The food pretreatment apparatus for food testing according to claim 4, characterized in that, The end of the first telescopic rod (9) away from the central axis (4) is connected to the elastic telescopic scraper (11) via the second telescopic rod (10). The controller is used to control the extension and retraction of the second telescopic rod (10) based on the extension and retraction amount of the first telescopic rod (9), so that the elastic telescopic scraper (11) abuts against the side wall of the tank (7).

6. The food pretreatment apparatus for food testing according to claim 5, characterized in that, Both the elastic telescopic scraper (11) and the second telescopic rod (10) are tilted at a preset angle relative to the liquid surface inside the tank (7).

7. The food pretreatment apparatus for food testing according to claim 6, characterized in that, The elastic telescopic scraper (11) includes a plate body (18), and an elastic shovel plate (19) is provided at one end of the plate body (18) away from the second telescopic rod (10).

8. The food pretreatment apparatus for food testing according to claim 7, characterized in that, A drain groove is provided on the plate (18), and a first filter screen (20) is provided in the drain groove.

9. The food pretreatment apparatus for food testing according to claim 8, characterized in that, A second filter screen (21) is provided at the connection between the liquid injection channel (6) and the pulverizer (1).

10. The food pretreatment apparatus for food testing according to claim 9, characterized in that, The controller is used to calculate the concentration ratio of the liquid in the tank (7) based on the extension amount of the first telescopic rod (9).

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