Natural food additive detection equipment and detection system thereof

Abstract

The invention discloses natural food additive detection equipment and a detection system thereof, and relates to the field of natural food additive detection.The natural food additive detection equipment comprises a sampling stirring tank, a mechanical arm and a high performance liquid chromatograph, and a sampling device is arranged on the outer wall of the sampling stirring tank; the sampling device comprises a plurality of liquid circulating components which are sequentially arranged on the outer wall of the sampling stirring tank from top to bottom, and a first conveying pipe, a first heat exchange pipe, a mixing tank, a filter pipe and a sample liquid collecting tank which are sequentially arranged and communicated with one another; the liquid inlet end of the first conveying pipe is communicated with the liquid circulating components; the device further comprises a temperature control diluent supply device and a quantitative bottling device. According to the equipment and the system disclosed by the invention, a plurality of links such as sampling, rapid cooling and diluting, mixing, filtering, quantitative subpackaging, detection and analysis are integrated, and full-automatic closed-loop control of a detection process is realized.

Description

Technical Field

[0001] This invention relates to the technical field of natural food additive detection, specifically to a natural food additive detection device and its detection system. Background Technology

[0002] As consumers increasingly prioritize food health and safety, natural food additives, derived from plants, animals, or microorganisms and possessing relatively high safety profiles, are finding wider application in the food industry. Among these, natural preservatives are of paramount importance, as their purity and activity directly impact the preservative effect and safety of food. Therefore, rapid and accurate testing of the purity of natural food additives, especially preservatives, during the production process is a crucial step in ensuring product quality.

[0003] Currently, the sampling and pretreatment of liquid natural food additives largely rely on manual operation or semi-automated equipment. A typical process includes manual sampling from the production tank, transfer to the laboratory, manual or simple mechanical dilution, mixing, filtration, and finally filling sample vials for HPLC analysis. However, natural additive systems are complex and often contain endogenous enzymes and other active substances. If effective processing is not performed immediately after sampling, enzymatic and oxidation reactions in the sample will continue, causing changes in the sample composition before detection. This results in the final test results failing to accurately reflect the product's state at the moment of sampling.

[0004] In summary, existing technologies suffer from the following main shortcomings: First, the sampling process lacks effective representativeness assurance and real-time processing capabilities, leading to sample distortion; second, the methods for inhibiting sample activity during pretreatment are insufficient or inefficient, failing to "freeze" the sample state. Therefore, there is an urgent need to develop a detection device and system capable of fully automated, closed-loop operation and rapid sample cooling and dilution. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a natural food additive detection device and system to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a natural food additive detection device, comprising a sampling and stirring tank, a robotic arm, and a high-performance liquid chromatograph (HPLC). The sampling and stirring tank has a sampling device on its outer wall, comprising multiple liquid circulation components arranged sequentially from top to bottom on the outer wall of the sampling and stirring tank, a first delivery pipe, a first heat exchange pipe, a mixing tank, a filter pipe, and a sample liquid collection tank arranged sequentially and interconnected. The inlet end of the first delivery pipe is connected to the liquid circulation components. The device also includes a temperature-controlled diluent supply device, comprising two second heat exchange pipes symmetrically arranged on both sides of the first heat exchange pipe, and a diluent supply component whose output end is connected to the input ends of the multiple second heat exchange pipes. The output end of the second heat exchange pipes is connected to the mixing tank. Furthermore, a quantitative bottling device is provided at the discharge end of the sample liquid collection tank. The quantitative bottling device is used to fill the sample liquid into a test bottle, and the robotic arm moves the test bottle containing the sample liquid into the HPLC.

[0007] According to one embodiment of the present invention, the liquid circulation component includes a circulation pump disposed on the outer wall of the sampling mixing tank. The inlet end of the circulation pump is connected to the sampling mixing tank via a pipe, and the outlet end of the circulation pump is connected to a ball valve via a first return pipe. The ball valve is connected to the sampling mixing tank via a second return pipe, and the inlet end of the first delivery pipe is connected to the ball valve. A first flow valve is provided on the first return pipe. In this preferred embodiment, the liquid circulation component facilitates continuous circulation of the liquid at the sampling port, effectively ensuring the freshness of the sample liquid.

[0008] According to one embodiment of the present invention, the ball valve includes a valve body disposed on the outer wall of the sampling stirring tank, a valve ball disposed within the valve body, a T-shaped flow channel passing through the valve ball, and a first micro motor disposed on the top of the valve body for driving the valve ball to rotate; the valve body is connected to the first reflux pipe, the first delivery pipe, and the second reflux pipe. In this preferred embodiment, a stable switching between sample liquid circulation and sample liquid sampling is achieved through the ball valve.

[0009] According to one embodiment of the present invention, the diluent supply component includes a diluent mixing tank, two heat radiation chambers disposed on the outer wall of the diluent mixing tank, a supply pipe with one end connected to the drain end of the diluent mixing tank and the other end connected to a plurality of second heat exchange pipes, and a delivery pump, a second flow sensor, and a first electrically controlled valve arranged sequentially along the supply pipe. In this preferred embodiment, a stable supply of diluent at a set temperature is achieved through the diluent supply component.

[0010] According to one embodiment of the present invention, the system further includes a first nitrogen purging component disposed at one end of the first delivery pipe near the liquid circulation component, and a second nitrogen purging component disposed on the supply pipe and located on the side of the first electrically controlled valve away from the second flow sensor. The first nitrogen purging component includes a solenoid valve whose input end is connected to a nitrogen source pipe and a backwash liquid pipe, and a second electrically controlled valve whose input end is connected to the output end of the solenoid valve via a pipe. The output end of the second electrically controlled valve is connected to the first delivery pipe via a pipe. The second nitrogen purging component has the same structure as the first nitrogen purging component. In this preferred embodiment, the first and second nitrogen purging components can effectively prevent liquid residue in the sample liquid pipe and the diluent pipe.

[0011] According to one embodiment of the present invention, a micro drive motor with its actuating end extending into the mixing tank is provided at the top of the mixing tank. The actuating end of the micro drive motor is provided with a stirring shaft, and a plurality of stirring rods are sequentially arranged from top to bottom on the outer wall of the stirring shaft; the plurality of stirring rods correspond one-to-one with the positions of the plurality of first heat exchange tubes. In this preferred embodiment, the mixing tank facilitates stable mixing of the sample solution and the diluent.

[0012] According to one embodiment of the present invention, the outer wall of the filter tube is provided with a miniature power motor with its actuating end penetrating through the filter tube, a positioning ring horizontally disposed on the inner wall of the filter tube and connected to the actuating end of the miniature power motor, and a filter membrane disposed within the inner ring of the positioning ring. In this preferred embodiment, stable filtration of the sample liquid is achieved through the filter tube.

[0013] According to one embodiment of the present invention, the filter tube is provided with an airbag assembly for sealing the gap between the positioning ring and the inner wall of the filter tube. The airbag assembly includes two annular airbags symmetrically arranged on the inner wall of the filter tube about the positioning ring as an axis, a first air source pipe with one end connected to the two annular airbags, and an exhaust pipe with one end connected to the two annular airbags. In this preferred embodiment, the airbag assembly facilitates sealing the gap between the positioning ring and the inner wall of the filter tube.

[0014] According to one embodiment of the present invention, the quantitative bottling device includes a positioning base, a test bottle support frame disposed on top of the positioning base, a metering pump disposed on the positioning base with its input end connected to the discharge end of the sample liquid collection tank via a pipe, a dispensing tube disposed at the discharge end of the metering pump, and a linear guide rail disposed on the positioning base with its execution end connected to the end of the dispensing tube. In this preferred embodiment, the bottling device achieves stable dispensing of the sample liquid.

[0015] Based on the above technical solution for a natural food additive testing device, a testing system for the natural food additive testing device will also be provided, including a user terminal and a control center connected to the user terminal via a network. The control center is electrically connected to a sampling mixing tank, a sampling device, a temperature-controlled diluent supply device, a quantitative bottling device, a robotic arm, and a high-performance liquid chromatograph. The control center includes a sampling module, a temperature analysis module, a diluent supply module, a nitrogen purging module, a dispensing module, and an additive detection and analysis module.

[0016] In summary, the present invention has the following main beneficial effects:

[0017] The equipment and system of this invention integrate multiple processes such as sampling, rapid cooling and dilution, mixing, filtration, quantitative dispensing, and detection and analysis into one unit, realizing fully automated closed-loop control of the detection process. Its core design lies in ensuring sample stability throughout the entire process from sample extraction to analysis through precise physical and chemical environmental control, significantly improving the accuracy and repeatability of the detection data.

[0018] The equipment utilizes multiple liquid circulation components arranged sequentially from top to bottom to simultaneously sample from different depths within the sampling mixing tank. This effectively avoids sampling deviations caused by material stratification or uneven distribution, ensuring sample representativeness. The sampling module can instantly trigger a ball valve to switch the flow path, allowing the sample liquid to quickly leave the production environment and enter a controlled pretreatment process, significantly shortening sample exposure time.

[0019] Addressing the critical issue that natural preservatives often contain endogenous enzymes and are prone to continuing to react after sampling, the equipment features a unique dual-path heat exchange system. The temperature analysis module intelligently adjusts the diluent temperature based on the initial sample temperature. As the diluent flows through the second heat exchange tube, it undergoes efficient counter-current heat exchange with the sample solution in the first heat exchange tube, achieving rapid and uniform cooling of the sample solution. Combined with precise dilution, this instantly reduces the enzyme concentration below its Michaelis constant, effectively "freezing" the enzymatic reaction and providing a near-instantaneous sample state for subsequent chromatographic analysis, fundamentally improving the accuracy of the detection values.

[0020] The mixing vessel is equipped with multi-layered stirring rods driven by a micro motor to ensure that the sample solution and the low-temperature diluent are thoroughly and evenly mixed in a short time.

[0021] The pipeline uses nitrogen purging technology, which can completely purge the residual liquid in the pipeline to the collection tank after each transport, ensuring the accuracy of the sample quantity, avoiding cross-contamination, and facilitating the cleaning of the backwashing system.

[0022] The filter tube adopts a flip-up filter membrane design, combined with an airbag sealing assembly and nitrogen purging and backwashing functions, which can facilitate online cleaning and maintenance of the system, ensuring long-term operational stability and reliable test results.

[0023] The quantitative bottling device uses a metering pump and linear guide rail to achieve high-precision, automated dispensing of sample liquid into the test vials. A robotic arm then seamlessly transfers the test vials into the high-performance liquid chromatograph (HPLC). The entire process requires no manual intervention, improving efficiency and reducing errors and contamination risks introduced by human operation. Attached Figure Description

[0024] Figure 1 This is an isometric view of the overall structure of the detection equipment of the present invention;

[0025] Figure 2 This is an exploded view of the overall structure of the detection equipment of the present invention;

[0026] Figure 3 This is an exploded view of the sampling device structure of the present invention;

[0027] Figure 4 This is an exploded view of the temperature-controlled dilution liquid supply device of the present invention.

[0028] Figure 5 This is an isometric view of the quantitative bottling device of the present invention;

[0029] Figure 6 This is a side view of the overall structure of the detection device of the present invention;

[0030] Figure 7 This is a cross-sectional view of the overall structure of the detection device of the present invention;

[0031] Figure 8 This is a cross-sectional view of the sampling and stirring tank structure of the present invention;

[0032] Figure 9 This is a cross-sectional view of the temperature-controlled dilution liquid supply device of the present invention;

[0033] Figure 10 This is an enlarged view of the structure at point A of the present invention;

[0034] Figure 11 This is an enlarged view of the structure at point B of the present invention;

[0035] Figure 12 This is a structural framework diagram of the detection system of the present invention;

[0036] Figure 13 This is a structural framework diagram of the control center system of the present invention.

[0037] Figure Descriptions: 10. Sampling and mixing tank; 20. Sampling device; 21. Liquid circulation component; 211. Circulation pump; 212. First reflux pipe; 213. Ball valve; 2131. Valve body; 2132. Valve ball; 2133. T-shaped flow channel; 2134. First micro motor; 214. Second reflux pipe; 215. First flow valve; 22. First heat exchange pipe; 23. Mixing tank; 231. Micro drive motor; 232. Stirring shaft; 233. Stirring rod; 24. Filter tube; 241. Micro power motor; 242. Positioning ring; 243. Filter membrane; 244. Airbag assembly; 2441. Annular airbag; 2442. First air source pipe; 244 3. Exhaust pipe; 25. Sample liquid collection tank; 26. First nitrogen purging component; 261. Nitrogen gas source pipe; 262. Backwash liquid pipe; 263. Solenoid valve; 264. Second solenoid valve; 27. First delivery pipe; 30. Temperature-controlled diluent supply device; 31. Second heat exchange pipe; 32. Diluent supply component; 321. Diluent homogenizing tank; 322. Thermal radiation chamber; 323. Supply pipe; 324. Delivery pump; 325. Second flow sensor; 326. First solenoid valve; 33. Second nitrogen purging component; 40. Quantitative bottling device; 41. Base; 42. Test bottle support frame; 43. Metering pump; 44. Dispensing pipe; 45. Linear guide rail. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] The embodiments of the present invention will now be described.

[0040] Please refer to the appendix for details. Figure 1 , 5 As shown in Figures 6, 12, and 13, in a preferred embodiment of the present invention, a natural food additive detection device includes a sampling and stirring tank 10, a robotic arm, and a high-performance liquid chromatograph. The outer wall of the sampling and stirring tank 10 is provided with a sampling device 20, and it also includes a temperature-controlled diluent supply device 30 and a quantitative bottling device 40 located at the discharge end of the sample liquid collection tank 25. The quantitative bottling device 40 is used to fill the sample liquid into a test bottle. The robotic arm moves the test bottle containing the sample liquid into the high-performance liquid chromatograph. The quantitative bottling device 40 includes a positioning base 41, a test bottle support frame 42 located on the top of the positioning base 41, a metering pump 43 located on the positioning base 41 with its input end connected to the discharge end of the sample liquid collection tank 25 via a pipe, a dispensing pipe 44 located at the discharge end of the metering pump 43, and a linear guide rail 45 located on the positioning base 41 with its execution end connected to the end of the dispensing pipe 44.

[0041] It should be noted that in this embodiment, the purity of natural food preservatives needs to be tested during production. The purity of the preservatives directly affects whether they can achieve the expected antibacterial level in food. When sampling for preservative testing, the sample solution needs to be cooled and diluted quickly. Natural preservative systems often contain endogenous enzymes. Cooling and dilution cause the enzyme concentration to drop below the Km value instantly, and the reaction rate approaches zero, which increases the accuracy of subsequent test values.

[0042] During additive sampling and testing, the natural food additive to be sampled is located in the sampling mixing tank 10 and is continuously stirred by the sampling mixing tank 10. During sampling, the sampling module simultaneously triggers multiple ball valves 213 so that the sample liquid in the sampling mixing tank 10 enters the mixing tank 23 through the circulation pump 211, the first return pipe 212, the ball valve 213, the first delivery pipe 27, and the first heat exchange pipe 22 under the action of the liquid circulation component 21. The sampling module receives the flow information measured by the first flow valve 215 and triggers the ball valve 213 after the total flow reaches the set value to stop sampling.

[0043] Before the additive sampling and testing, the temperature analysis module receives the temperature information of the natural food additive measured by the temperature sensor in the sampling mixing tank 10, and triggers the diluent supply component 32 to adjust the temperature of the diluent according to the cooling requirements of the natural food additive sample.

[0044] During additive sampling and testing, the diluent supply module triggers the diluent supply component 32 to supply diluent. The diluent enters the second heat exchange tube 31 through the supply pipe 323 and then enters the mixing tank 23 through the second heat exchange tube 31. The diluent supply module receives the flow information measured by the second flow sensor 325 and shuts off the delivery pump 324 and the first solenoid valve 326 after the total flow reaches the set value.

[0045] When the diluent passes through the second heat exchange tube 31, it can cool down the sample liquid in the first heat exchange tube 22 through heat exchange. The sample liquid and the diluent are mixed in the mixing tank 23, and the mixed sample liquid can enter the sample liquid collection tank 25.

[0046] The nitrogen purging module triggers the first nitrogen purging component 26 and the second nitrogen purging component 33 to purge nitrogen simultaneously, so as to purge all the remaining sample liquid and diluent in the pipeline into the sample liquid collection tank 25. The gas in the sample liquid collection tank 25 can be discharged through the hydrophobic exhaust valve at the top of the sample liquid collection tank 25.

[0047] The dispensing module triggers the bottom valve of the sample liquid collection tank 25 and the quantitative bottling device 40 to transfer the sample liquid in the sample liquid collection tank 25 into the test bottle according to the set amount.

[0048] The additive detection and analysis module triggers a robotic arm to move a test vial containing the sample solution into a high-performance liquid chromatograph (HPLC). After analysis by the HPLC, the detection data can be transmitted to the additive detection and analysis module, which then feeds back the detection results to the user.

[0049] Furthermore, multiple liquid circulation components 21 arranged sequentially from top to bottom can take samples from different positions in the sampling and stirring tank 10 to ensure that the samples are representative.

[0050] Furthermore, when the quantitative bottling device 40 is working, the metering pump 43 is turned on, and the sample liquid in the sample liquid collection tank 25 is transferred to the dispensing tube 44 by the metering pump 43, and then moved into the test bottle through the dispensing tube 44. The actuator of the linear guide 45 can drive the end of the dispensing tube 44 to move, so as to facilitate dispensing into different test bottles.

[0051] Please refer to the appendix for details. Figure 2 , 3As shown in Figures 5, 7, 8, 10, and 11, in another preferred embodiment of the present invention, the sampling device 20 includes a plurality of liquid circulation components 21 arranged sequentially from top to bottom on the outer wall of the sampling stirring tank 10, a first delivery pipe 27, a first heat exchange pipe 22, a mixing tank 23, a filter pipe 24, and a sample liquid collection tank 25 arranged sequentially and interconnected. The inlet end of the first delivery pipe 27 is connected to the liquid circulation component 21. The liquid circulation component 21 includes a circulation pump 211 arranged on the outer wall of the sampling stirring tank 10, and the inlet end of the circulation pump 211 is connected to a pipe. The sampling mixing tank 10 is connected to the sampling mixing tank 10. The discharge end of the circulation pump 211 is connected to the ball valve 213 through the first return pipe 212. The ball valve 213 is connected to the sampling mixing tank 10 through the second return pipe 214. The inlet end of the first delivery pipe 27 is connected to the ball valve 213. A first flow valve 215 is provided on the first return pipe 212. The ball valve 213 includes a valve body 2131 disposed on the outer wall of the sampling mixing tank 10, a valve ball 2132 disposed in the valve body 2131, a T-shaped flow channel 2133 passing through the valve ball 2132, and a flow channel 2133 disposed on the valve body. A first micro motor 2134 is located at the top of valve body 2131 and is used to drive the valve ball 2132 to rotate. Valve body 2131 connects to the first return pipe 212, the first delivery pipe 27, and the second return pipe 214. A micro drive motor 231 with its actuating end extending into the mixing tank 23 is located at the top of the mixing tank 23. A stirring shaft 232 is located at the actuating end of the micro drive motor 231. Multiple stirring rods 233 are sequentially arranged from top to bottom on the outer wall of the stirring shaft 232. The multiple stirring rods 233 correspond one-to-one with the positions of multiple first heat exchange pipes 22. The mixing tank 23 also includes components located at the top of the mixing tank 23. The first nitrogen purging component 26 is located near the liquid circulation component 21 at one end of the first delivery pipe 27, and the second nitrogen purging component 33 is located on the supply pipe 323 and on the side of the first solenoid valve 326 away from the second flow sensor 325. The first nitrogen purging component 26 includes a solenoid valve 263 whose input end is connected to the nitrogen source pipe 261 and the backwash liquid pipe 262, and a second solenoid valve 264 whose input end is connected to the output end of the solenoid valve 263 through a pipe. The output end of the second solenoid valve 264 is connected to the first delivery pipe 27 through a pipe.The second nitrogen purging component 33 has the same structure as the first nitrogen purging component 26. The outer wall of the filter tube 24 is provided with a miniature power motor 241 whose actuating end penetrates the filter tube 24; a positioning ring 242 horizontally disposed on the inner wall of the filter tube 24 and connected to the actuating end of the miniature power motor 241; and a filter membrane 243 disposed within the inner ring of the positioning ring 242. The filter tube 24 is provided with an airbag assembly 244 for sealing the gap between the positioning ring 242 and the inner wall of the filter tube 24. The airbag assembly 244 includes two annular airbags 2441 symmetrically disposed on the inner wall of the filter tube 24 about the positioning ring 242; a first air source pipe 2442 connecting one end to the two annular airbags 2441; and an exhaust pipe 2443 connecting one end to the two annular airbags 2441.

[0052] It should be noted that, in this embodiment, when the liquid circulation component 21 is working in circulation, the circulation pump 211 is turned on, and the sample liquid enters the first return pipe 212 through the pipeline, and then returns to the sampling stirring tank 10 through the ball valve 213 and the second return pipe 214; when the liquid circulation component 21 is working in sampling, the circulation pump 211 is turned on, and the sample liquid enters the first return pipe 212 through the pipeline, and then enters the first delivery pipe 27 through the ball valve 213.

[0053] Furthermore, when the ball valve 213 is working, the actuator of the first micro motor 2134 drives the valve ball 2132 to rotate, so that the T-shaped flow channel 2133 connects the first return pipe 212 and the second return pipe 214, or connects the T-shaped flow channel 2133 to the first return pipe 212 and the first delivery pipe 27.

[0054] Furthermore, when the mixing tank 23 is working, the micro drive motor 231 drives the stirring shaft 232 and the stirring rod 233 to rotate, so as to carry out stirring and mixing;

[0055] Furthermore, when the filter tube 24 is working, the filter membrane 243 performs filtration. When backflushing is performed, the airbag assembly 244 is released from its limit, and the micro motor 241 drives the positioning ring 242 to flip.

[0056] Furthermore, when the airbag assembly 244 is working, the first air source pipe 2442 connected to the air source system supplies air. Pressurized gas enters the annular airbag 2441 through the first air source pipe 2442. The annular airbag 2441 expands to seal the gap between the positioning ring 242 and the filter pipe 24. When the seal is removed, the valve on the exhaust pipe 2443 opens, and the gas in the annular airbag 2441 is discharged through the exhaust pipe 2443.

[0057] Furthermore, the first nitrogen purging component 26 purges or rinses the sample liquid delivery pipeline, and the second nitrogen purging component 33 purges or rinses the diluent delivery pipeline. The first nitrogen purging component 26 and the second nitrogen purging component 33 work on the same principle. Taking the first nitrogen purging component 26 as an example, the nitrogen gas source connected to the nitrogen gas source pipe 261 is turned on, and nitrogen enters the first delivery pipe 27 through the nitrogen gas source pipe 261, the solenoid valve 263 and the second solenoid valve 264 in the open state for nitrogen purging.

[0058] During rinsing, the backwash liquid pipe 262 connected to the rinsing liquid supply system is opened, and the solenoid valve 263 is switched to connect the backwash liquid pipe 262. The rinsing liquid enters the first delivery pipe 27 through the backwash liquid pipe 262, the solenoid valve 263, and the second solenoid valve 264 in the open state to carry out the rinsing work. Finally, the rinsing liquid is discharged into the waste liquid pipe on the test bottle support frame 42 through the dispensing pipe 44 to complete the rinsing of the entire system.

[0059] Please refer to the appendix for details. Figure 4 , 9 As shown, in another preferred embodiment of the present invention, the temperature-controlled diluent supply device 30 includes two second heat exchange tubes 31 symmetrically arranged on both sides of the first heat exchange tube 22, and a diluent supply component 32 whose output end is connected to the input end of a plurality of second heat exchange tubes 31. The output end of the second heat exchange tubes 31 is connected to the mixing tank 23. The diluent supply component 32 includes a diluent mixing tank 321, two heat radiation cavities 322 disposed on the outer wall of the diluent mixing tank 321, a supply pipe 323 whose one end is connected to the drain end of the diluent mixing tank 321 and whose other end is connected to a plurality of second heat exchange tubes 31, and a delivery pump 324, a second flow sensor 325, and a first electrically controlled valve 326 arranged sequentially along the supply pipe 323.

[0060] It should be noted that, in this embodiment, when the temperature-controlled diluent supply device 30 is working, heaters and coolers can be respectively installed in the two heat radiation chambers 322 to heat or cool the diluent mixing tank 321. After the delivery pump 324 and the first solenoid valve 326 are opened, the diluent can enter the second heat exchange tube 31 through the supply pipe 323.

[0061] According to the above embodiments, a detection system for a natural food additive detection device will also be provided, including a user terminal and a control center connected to the user terminal via a network. The control center is electrically connected to a sampling stirring tank 10, a sampling device 20, a temperature-controlled diluent supply device 30, a quantitative bottling device 40, a robotic arm, and a high-performance liquid chromatograph. The control center includes a sampling module, a temperature analysis module, a diluent supply module, a nitrogen purging module, a dispensing module, and an additive detection and analysis module.

[0062] The working principle of this invention is as follows:

[0063] The purity of natural food preservatives needs to be tested during production. The purity of the preservative directly affects whether it can achieve the expected antibacterial level in food. When sampling for preservative testing, the sample solution needs to be cooled and diluted quickly. Natural preservative systems often contain endogenous enzymes. Cooling and dilution make the enzyme concentration drop below the Km value instantly, and the reaction rate approaches zero, which increases the accuracy of subsequent test values.

[0064] During additive sampling and testing, the natural food additive to be sampled is located in the sampling mixing tank 10 and is continuously stirred by the sampling mixing tank 10. During sampling, the sampling module simultaneously triggers multiple ball valves 213 so that the sample liquid in the sampling mixing tank 10 enters the mixing tank 23 through the circulation pump 211, the first return pipe 212, the ball valve 213, the first delivery pipe 27, and the first heat exchange pipe 22 under the action of the liquid circulation component 21. The sampling module receives the flow information measured by the first flow valve 215 and triggers the ball valve 213 after the total flow reaches the set value to stop sampling.

[0065] Before the additive sampling and testing, the temperature analysis module receives the temperature information of the natural food additive measured by the temperature sensor in the sampling mixing tank 10, and triggers the diluent supply component 32 to adjust the temperature of the diluent according to the cooling requirements of the natural food additive sample.

[0066] During additive sampling and testing, the diluent supply module triggers the diluent supply component 32 to supply diluent. The diluent enters the second heat exchange tube 31 through the supply pipe 323 and then enters the mixing tank 23 through the second heat exchange tube 31. The diluent supply module receives the flow information measured by the second flow sensor 325 and shuts off the delivery pump 324 and the first solenoid valve 326 after the total flow reaches the set value.

[0067] When the diluent passes through the second heat exchange tube 31, it can cool down the sample liquid in the first heat exchange tube 22 through heat exchange. The sample liquid and the diluent are mixed in the mixing tank 23, and the mixed sample liquid can enter the sample liquid collection tank 25.

[0068] The nitrogen purging module triggers the first nitrogen purging component 26 and the second nitrogen purging component 33 to purge nitrogen simultaneously, so as to purge all the remaining sample liquid and diluent in the pipeline into the sample liquid collection tank 25. The gas in the sample liquid collection tank 25 can be discharged through the hydrophobic exhaust valve at the top of the sample liquid collection tank 25.

[0069] The dispensing module triggers the bottom valve of the sample liquid collection tank 25 and the quantitative bottling device 40 to transfer the sample liquid in the sample liquid collection tank 25 into the test bottle according to the set amount.

[0070] The additive detection and analysis module triggers a robotic arm to move a test vial containing the sample solution into a high-performance liquid chromatograph (HPLC). After analysis by the HPLC, the detection data can be transmitted to the additive detection and analysis module, which then feeds back the detection results to the user.

[0071] Multiple liquid circulation components 21 arranged sequentially from top to bottom can take samples from different positions in the sampling and stirring tank 10 to ensure that the samples are representative.

[0072] When the quantitative bottling device 40 is working, the metering pump 43 is turned on, and the sample liquid in the sample liquid collection tank 25 is transferred to the dispensing tube 44 by the metering pump 43, and then moved into the test bottle through the dispensing tube 44. The actuator of the linear guide rail 45 can drive the end of the dispensing tube 44 to move, so as to dispense different test bottles.

[0073] When the liquid circulation component 21 is working, the circulation pump 211 is turned on, and the sample liquid enters the first return pipe 212 through the pipeline, and then returns to the sampling and stirring tank 10 through the ball valve 213 and the second return pipe 214; when the liquid circulation component 21 is working, the circulation pump 211 is turned on, and the sample liquid enters the first return pipe 212 through the pipeline, and then enters the first delivery pipe 27 through the ball valve 213.

[0074] When the ball valve 213 is working, the actuator of the first micro motor 2134 drives the valve ball 2132 to rotate, so that the T-shaped flow channel 2133 connects the first return pipe 212 and the second return pipe 214, or connects the T-shaped flow channel 2133 to the first return pipe 212 and the first delivery pipe 27.

[0075] When the mixing tank 23 is working, the micro drive motor 231 drives the stirring shaft 232 and the stirring rod 233 to rotate in order to stir and mix.

[0076] When the filter tube 24 is working, the filter membrane 243 performs filtration. When backwashing is performed, the airbag assembly 244 is released from its limit, and the micro motor 241 drives the positioning ring 242 to flip.

[0077] When the airbag assembly 244 is working, the first air source pipe 2442 connected to the air source system supplies air. Pressurized gas enters the annular airbag 2441 through the first air source pipe 2442. The annular airbag 2441 expands to seal the gap between the positioning ring 242 and the filter pipe 24. When the seal is removed, the valve on the exhaust pipe 2443 opens, and the gas in the annular airbag 2441 is discharged through the exhaust pipe 2443.

[0078] The first nitrogen purging component 26 purges or flushes the sample liquid delivery pipeline, and the second nitrogen purging component 33 purges or flushes the diluent delivery pipeline. The first nitrogen purging component 26 and the second nitrogen purging component 33 work on the same principle. Taking the first nitrogen purging component 26 as an example, the nitrogen gas source connected to the nitrogen gas source pipe 261 is turned on, and nitrogen enters the first delivery pipe 27 through the nitrogen gas source pipe 261, the solenoid valve 263 and the second solenoid valve 264 in the open state for nitrogen purging.

[0079] During rinsing, the backwash liquid pipe 262 connected to the rinsing liquid supply system is opened, and the solenoid valve 263 is switched to the backwash liquid pipe 262. The rinsing liquid enters the first delivery pipe 27 through the backwash liquid pipe 262, the solenoid valve 263, and the second solenoid valve 264 in the open state to carry out the rinsing work. Finally, the rinsing liquid is discharged into the waste liquid pipe on the test bottle support frame 42 through the dispensing pipe 44 to complete the rinsing of the entire system.

[0080] When the temperature-controlled diluent supply device 30 is working, heaters and coolers can be installed in the two heat radiation chambers 322 respectively to heat or cool the diluent mixing tank 321. After the delivery pump 324 and the first electric control valve 326 are opened, the diluent can enter the second heat exchange tube 31 through the supply pipe 323.

[0081] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A device for detecting natural food additives, comprising a sampling and stirring tank (10), a robotic arm, and a high-performance liquid chromatograph, characterized in that, The outer wall of the sampling mixing tank (10) is provided with a sampling device (20). The sampling device (20) includes a plurality of liquid circulation components (21) arranged sequentially from top to bottom on the outer wall of the sampling mixing tank (10), a first delivery pipe (27), a first heat exchange pipe (22), a mixing tank (23), a filter pipe (24), and a sample liquid collection tank (25) arranged sequentially and interconnected with each other. The liquid inlet end of the first delivery pipe (27) is connected to the liquid circulation component (21). It also includes a temperature-controlled diluent supply device (30), which includes two second heat exchange tubes (31) symmetrically arranged on both sides of the first heat exchange tube (22), and a diluent supply component (32) whose output end is connected to the input end of multiple second heat exchange tubes (31). The output end of the second heat exchange tubes (31) is connected to the mixing tank (23). It also includes a quantitative bottling device (40) located at the drain end of the sample liquid collection tank (25). The quantitative bottling device (40) is used to fill the sample liquid into the test bottle, and the robotic arm moves the test bottle containing the sample liquid into the high performance liquid chromatograph.

2. The natural food additive testing equipment according to claim 1, characterized in that, The liquid circulation component (21) includes a circulation pump (211) disposed on the outer wall of the sampling stirring tank (10). The inlet end of the circulation pump (211) is connected to the sampling stirring tank (10) through a pipe. The outlet end of the circulation pump (211) is connected to a ball valve (213) through a first return pipe (212). The ball valve (213) is connected to the sampling stirring tank (10) through a second return pipe (214). The inlet end of the first delivery pipe (27) is connected to the ball valve (213). The first return pipe (212) is equipped with a first flow valve (215).

3. The natural food additive testing equipment according to claim 2, characterized in that, The ball valve (213) includes a valve body (2131) disposed on the outer wall of the sampling mixing tank (10), a valve ball (2132) disposed inside the valve body (2131), a T-shaped flow channel (2133) passing through the valve ball (2132), and a first micro motor (2134) disposed on the top of the valve body (2131) for driving the valve ball (2132) to rotate. The valve body (2131) is connected to the first return pipe (212), the first delivery pipe (27) and the second return pipe (214).

4. The natural food additive testing equipment according to claim 1, characterized in that, The diluent supply component (32) includes a diluent mixing tank (321), two heat radiation chambers (322) disposed on the outer wall of the diluent mixing tank (321), a supply pipe (323) connected at one end to the drain end of the diluent mixing tank (321) and at the other end to a plurality of second heat exchange pipes (31), and a delivery pump (324), a second flow sensor (325), and a first electrically controlled valve (326) arranged sequentially along the supply pipe (323).

5. The natural food additive testing device according to claim 4, characterized in that, It also includes a first nitrogen purging component (26) located at one end of the first delivery pipe (27) near the liquid circulation component (21), and a second nitrogen purging component (33) located on the supply pipe (323) and on the side of the first electronically controlled valve (326) away from the second flow sensor (325). The first nitrogen purging component (26) includes a solenoid valve (263) whose input end is connected to a nitrogen gas source pipe (261) and a backwash liquid pipe (262), and a second electrically controlled valve (264) whose input end is connected to the output end of the solenoid valve (263) through a pipe. The output end of the second electrically controlled valve (264) is connected to the first delivery pipe (27) through a pipe. The second nitrogen purging component (33) has the same structure as the first nitrogen purging component (26).

6. The natural food additive testing device according to claim 1, characterized in that, The mixing tank (23) is provided with a micro drive motor (231) at the top, the execution end of which extends into the mixing tank (23). The micro drive motor (231) is provided with a stirring shaft (232) at the execution end. Multiple stirring rods (233) are arranged sequentially from top to bottom on the outer wall of the stirring shaft (232). The positions of the plurality of stirring rods (233) correspond one-to-one with the positions of the plurality of first heat exchange tubes (22).

7. The natural food additive testing equipment according to claim 1, characterized in that, The outer wall of the filter tube (24) is provided with a micro motor (241) with the actuating end penetrating through the filter tube (24), a positioning ring (242) horizontally disposed on the inner wall of the filter tube (24) and connected to the actuating end of the micro motor (241), and a filter membrane (243) disposed in the inner ring of the positioning ring (242).

8. The natural food additive testing device according to claim 7, characterized in that, The filter tube (24) is provided with an airbag assembly (244) for sealing the gap between the positioning ring (242) and the inner wall of the filter tube (24). The airbag assembly (244) includes two annular airbags (2441) symmetrically arranged on the inner wall of the filter tube (24) with the positioning ring (242) as the axis, a first air source pipe (2442) with one end connected to the two annular airbags (2441), and an exhaust pipe (2443) with one end connected to the two annular airbags (2441).

9. The natural food additive testing equipment according to claim 1, characterized in that, The quantitative bottling device (40) includes a positioning base (41), a test bottle support frame (42) located on the top of the positioning base (41), a metering pump (43) located on the positioning base (41) with its input end connected to the discharge end of the sample liquid collection tank (25) via a pipe, a dispensing pipe (44) located at the discharge end of the metering pump (43), and a linear guide rail (45) located on the positioning base (41) with its execution end connected to the end of the dispensing pipe (44).

10. A detection system for a natural food additive detection device, comprising a natural food additive detection device according to any one of claims 1-9, including a user terminal, a control center connected to the user terminal via a network, wherein the control center is electrically connected to a sampling stirring tank (10), a sampling device (20), a temperature-controlled diluent supply device (30), a quantitative bottling device (40), a robotic arm, and a high-performance liquid chromatograph, characterized in that, The control center includes a sampling module, a temperature analysis module, a diluent supply module, a nitrogen purging module, a dispensing module, and an additive detection and analysis module.

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