Real-time detection system for stevioside extraction process

Abstract

The invention relates to the technical field of stevioside extraction and detection, in particular to a real-time detection system for a stevioside extraction process, comprising: an extraction module for extracting stevioside in an extracting solution; the detection module is connected with the extraction module; comprising a concentration sensor which is arranged at the output end of the extraction tank and is used for detecting the concentration of stevioside in an extracting solution, a temperature sensor which is connected with the extraction tank and is used for detecting the temperature of the extracting solution in the extraction tank, and a pH sensor which is arranged in the extraction tank and is used for detecting the pH value of the extracting solution; the communication module is connected with the detection module and is used for verifying the collected detection signal and transmitting the detection signal to a display screen; and the control module is respectively connected with the extraction module, the detection module and the communication module and is used for determining the size of a sampling window of the detection signal according to the loss rate of the detection signal. According to the method, the detection stability of the stevioside extraction process is realized.

Description

Technical Field

[0001] The invention relates to the technical field of stevioside extraction and detection, and in particular to a real-time detection system for a stevioside extraction process. Background Art

[0002] In the prior art, stevia, as a natural sweetener, is increasingly used in the food, beverage and other industries. The efficiency and quality of its extraction process are of vital importance to meeting market demand and ensuring product quality. The traditional stevia extraction process relies heavily on manual experience and regular sampling and testing, which has many limitations. On the one hand, manual testing is difficult to achieve real-time and continuous monitoring of the extraction process, and sampling and analysis can only be performed at specific time points, which results in the process anomalies that may occur during the interval between two samplings cannot be discovered and handled in a timely manner.

[0003] Chinese Patent Publication No.: CN117929304A discloses an online monitoring system and method for a stevioside purification process. The stevioside purification process is a process of purifying a stevioside process liquid by using a macroporous adsorption resin column, which is characterized in that: a bypass line is connected in parallel to the main pipe at the bottom of the last column of the macroporous adsorption resin column, and a detection module for real-time detection of whether the stevioside process liquid is purified and qualified is installed on the bypass line, a solid content PID adjustment module for adjusting the solid content of the stevioside process liquid entering the detection module installed before the detection module, and a display alarm module; the detection module includes a flow cell installed on the bypass line and the inlet position of the flow cell is A mixer is installed, and the two ends of the circulation pool are connected to the fiber optic spectrometer and the light source through optical fibers, wherein the light source is a light emitting diode with two wavelengths of 430nm and 290nm respectively; the solid content PID adjustment module includes a refractometer installed on the bypass pipeline and a pure water storage tank connected to the bypass pipeline through a branch, and the outlet of the pure water storage tank is connected to the flow meter 2, the self-priming pump 2 and the control valve in sequence; a flow meter 1 is arranged on the inlet pipeline of the refractometer; the flow meter 2, the self-priming pump 2, the control valve, the flow meter 1 and the refractometer are all controlled by an industrial computer; the display alarm module includes an industrial computer and an alarm connected to the fiber optic spectrometer. It can be seen that the online monitoring system and method for the stevioside purification process has the problem that the line interface of the detection equipment is worn due to long-term use, resulting in looseness at the line interface, resulting in poor contact of the detection equipment, thereby causing the detection stability of the stevioside extraction process to decrease. Summary of the invention

[0004] To this end, the present invention provides a real-time detection system for a stevia extraction process, so as to overcome the problem in the prior art that the line interface of the detection equipment is worn due to long-term use, resulting in looseness at the line interface, causing poor contact of the detection equipment, and thus resulting in a decrease in the detection stability of the stevia extraction process.

[0005] To achieve the above-mentioned purpose, the present invention provides a real-time detection system for stevioside extraction process, comprising: an extraction module, used for extracting stevioside from an extracting solution, comprising an extraction tank for providing an extraction space for a stevioside mixed solution, a stirrer arranged inside the extraction tank for mixing stevioside raw materials and a solvent to output the extracting solution, and a heating rod connected to the extraction tank for heating the extraction tank; a detection module, which is connected to the extraction module, comprising a concentration sensor arranged at the output end of the extraction tank for detecting the concentration of stevioside in the extracting solution, a temperature sensor connected to the extraction tank for detecting the temperature of the extracting solution in the extraction tank; A sensor and a pH sensor arranged inside an extraction tank for detecting the pH value of an extract; a communication module connected to the detection module for verifying the collected detection signal and transmitting it to a display screen; a control module connected to the extraction module, the detection module and the communication module respectively for determining the sampling window size of the detection signal according to the loss rate of the detection signal, or determining the stirring rate of the stevioside mixed solution according to the maximum difference in the stevioside concentration in the extract, and determining the heating interval of the stevioside mixed solution according to the maximum difference in the stevioside concentration in the extract and the temperature fluctuation amplitude during the stevioside extraction process.

[0006] Furthermore, the control module is used to determine whether the detection stability of the stevioside extraction process meets the requirements according to the loss rate of the detection signal. If the loss rate of the detection signal is greater than a preset first loss rate, it is determined that the detection stability of the stevioside extraction process does not meet the requirements.

[0007] Furthermore, the control module preliminarily determines that the detection accuracy of the stevia extraction process does not meet the requirements when the loss rate of the detection signal is greater than the preset first loss rate and less than or equal to the preset second loss rate, and determines whether the detection accuracy of the stevia extraction process meets the requirements based on the maximum difference in stevia concentration in the extract.

[0008] Further, the control module increases the sampling window size of the detection signal when the loss rate of the detection signal is greater than the preset second loss rate;

[0009] The increase range of the sampling window size of the detection signal is determined by the difference between the loss rate of the detection signal and a preset second loss rate.

[0010] Furthermore, the control module is used to determine whether the detection accuracy of the stevia extraction process meets the requirements based on the maximum difference in stevia concentration in the extract. If the maximum difference in stevia concentration in the extract is greater than a preset first difference, it is determined that the detection accuracy of the stevia extraction process does not meet the requirements.

[0011] Furthermore, when the maximum difference in stevioside concentration in the extract is greater than a preset second difference, it is preliminarily determined that the stability of the detection environment of the stevioside extraction process does not meet the requirements, and whether the stability of the detection environment of the stevioside extraction process meets the requirements is determined based on the temperature fluctuation amplitude during the stevioside extraction process.

[0012] Furthermore, the control module increases the stirring rate of the stevioside mixed solution when the maximum difference in the stevioside concentration in the extract is greater than the preset first difference and less than or equal to the preset second difference.

[0013] Furthermore, the increase range of the stirring rate of the stevioside mixed solution is determined by the difference between the maximum difference amount of the stevioside concentration in the extract and a preset first difference amount.

[0014] Furthermore, the control module is used to determine whether the stability of the detection environment of the stevia extraction process meets the requirements according to the temperature fluctuation amplitude during the stevia extraction process. If the temperature fluctuation amplitude during the stevia extraction process is greater than the preset fluctuation amplitude, it is determined that the stability of the detection environment of the stevia extraction process does not meet the requirements, and the heating interval of the stevia mixed solution is increased.

[0015] Furthermore, the increase range of the heating interval of the stevioside mixed solution is determined by the difference between the temperature fluctuation range during the stevioside extraction process and a preset fluctuation range.

[0016] Compared with the prior art, the beneficial effect of the present invention lies in that the system of the present invention determines the sampling window size of the detection signal according to the loss rate of the detection signal by setting an extraction module, a detection module, a communication module and a control module. The line interface of the detection device is worn due to long-term use, resulting in looseness at the line interface, resulting in poor contact of the detection device, thereby causing the loss of the detected signal. By increasing the sampling window size of the detection signal, the problem caused by the signal loss can be alleviated, and the information loss caused by the signal loss can be compensated to a certain extent, so that the system can extract as much useful information as possible from the incomplete signal. The stirring rate of the stevioside mixed solution is determined according to the maximum difference in the stevioside concentration in the extract. Since the stevioside mixed solution is not fully mixed during the extraction process, the stevioside The dissolution rate and diffusion rate of inulin are different, resulting in uneven concentration inside the solution. By increasing the stirring rate of the stevioside mixed solution, the stevioside mixed solution in the high concentration area can flow to the low concentration area faster, promoting the diffusion of the solute, thereby reducing the concentration difference. The heating interval of the stevioside mixed solution is determined according to the temperature fluctuation amplitude during the stevioside extraction process. During the stevioside extraction process, a heating rod is used to heat the extract. When the insulating layer of the heating rod is damaged, a short circuit occurs, resulting in unstable heating temperature, thereby affecting the extraction of stevioside. By increasing the heating interval of the stevioside mixed solution, the number of heating times per unit time can be reduced, thereby reducing the total heat input, allowing the extract to have more time to dissipate heat naturally, avoiding excessive temperature, and improving the detection stability of the stevioside extraction process.

[0017] Furthermore, the system of the present invention determines the sampling window size of the detection signal by setting a first loss rate and a preset second loss rate. Due to long-term use, the line interface of the detection equipment is worn, resulting in looseness at the line interface, resulting in poor contact of the detection equipment, and thus causing the detected signal to be lost. By increasing the sampling window size of the detection signal, the problem caused by signal loss can be alleviated, and the information loss caused by signal loss can be compensated to a certain extent, so that the system can extract as much useful information as possible from the incomplete signal, further improving the detection stability of the stevia extraction process.

[0018] Furthermore, the system of the present invention determines the stirring rate of the stevioside mixed solution by setting a preset first difference amount and a preset second difference amount. Since the stevioside mixed solution is not fully mixed during the extraction process, the dissolution rate and diffusion rate of stevioside are different, resulting in uneven concentration inside the solution. By increasing the stirring rate of the stevioside mixed solution, the stevioside mixed solution in the high-concentration area can flow to the low-concentration area faster, promoting the diffusion of solutes, thereby reducing the concentration difference and further improving the detection stability of the stevioside extraction process.

[0019] Furthermore, the system of the present invention determines the heating interval of the stevia mixed solution by setting a preset fluctuation amplitude. Since a heating rod is used to heat the extract during the stevia extraction process, when the insulating layer of the heating rod is damaged, a short circuit occurs, resulting in unstable heating temperature, thereby affecting the stevia extraction. By increasing the heating interval of the stevia mixed solution, the number of heating times per unit time can be reduced, thereby reducing the total heat input, allowing the extract to have more time to dissipate heat naturally, avoiding excessive temperature, and further improving the detection stability of the stevia extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structural block diagram of the real-time detection system of the stevioside extraction process according to the embodiment of the present invention;

[0021] Figure 2 It is a logic flow chart of the real-time detection system of the stevioside extraction process according to the embodiment of the present invention;

[0022] Figure 3 A specific structural block diagram of an extraction module of a real-time detection system for stevioside extraction process according to an embodiment of the present invention;

[0023] Figure 4 The figure is a specific structural block diagram of the detection module of the real-time detection system of the stevioside extraction process according to the embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0026] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall structural block diagram, a logic flow chart, a specific structural block diagram of an extraction module, and a specific structural block diagram of a detection module of a real-time detection system for stevioside extraction process of an embodiment of the present invention. A real-time detection system for stevioside extraction process of the present invention comprises:

[0029] An extraction module, used for extracting stevioside from an extracting solution, comprising an extraction tank for providing an extraction space for a stevioside mixed solution, a stirrer arranged inside the extraction tank for mixing stevioside raw materials and a solvent to output the extracting solution, and a heating rod connected to the extraction tank for heating the extraction tank;

[0030] A detection module connected to the extraction module, comprising a concentration sensor disposed at the output end of the extraction tank for detecting the concentration of stevioside in the extract, a temperature sensor connected to the extraction tank for detecting the temperature of the extract in the extraction tank, and a pH sensor disposed inside the extraction tank for detecting the pH value of the extract;

[0031] A communication module, which is connected to the detection module and is used to verify the collected detection signal and transmit it to the display screen;

[0032] A control module is connected to the extraction module, the detection module and the communication module respectively, and is used to determine the sampling window size of the detection signal according to the loss rate of the detection signal, or to determine the stirring rate of the stevioside mixed solution according to the maximum difference in the stevioside concentration in the extract, and to determine the heating interval of the stevioside mixed solution according to the maximum difference in the stevioside concentration in the extract and the temperature fluctuation amplitude during the stevioside extraction process.

[0033] Specifically, the stevia mixed solution includes stevia raw materials, solvents and water.

[0034] Specifically, the solvent includes ethanol, methanol, and propanol.

[0035] Specifically, the sampling window size of the detection signal is the time range or data point range covered in one sampling process.

[0036] In implementation, the system of the present invention determines the sampling window size of the detection signal according to the loss rate of the detection signal by setting an extraction module, a detection module, a communication module and a control module. The line interface of the detection device is worn due to long-term use, resulting in looseness at the line interface, poor contact of the detection device, and thus the loss of the detected signal. By increasing the sampling window size of the detection signal, the problem caused by the signal loss can be alleviated, and the information loss caused by the signal loss can be compensated to a certain extent, so that the system can extract as much useful information as possible from the incomplete signal. The stirring rate of the stevioside mixed solution is determined according to the maximum difference in the stevioside concentration in the extract. Since the stevioside mixed solution is not fully mixed during the extraction process, the dissolution rate of stevioside is The different diffusion speeds lead to uneven concentration inside the solution. By increasing the stirring rate of the stevioside mixed solution, the stevioside mixed solution in the high concentration area can flow to the low concentration area faster, promoting the diffusion of the solute, thereby reducing the concentration difference. The heating interval of the stevioside mixed solution is determined according to the temperature fluctuation amplitude during the stevioside extraction process. During the stevioside extraction process, a heating rod is used to heat the extract. When the insulating layer of the heating rod is damaged, a short circuit occurs, resulting in unstable heating temperature, which affects the extraction of stevioside. By increasing the heating interval of the stevioside mixed solution, the number of heating times per unit time can be reduced, thereby reducing the total heat input, allowing the extract to have more time to dissipate heat naturally, avoiding excessive temperature, and improving the detection stability of the stevioside extraction process.

[0037] Specifically, the control module is used to obtain the loss rate of the detection signal. If the loss rate of the detection signal is greater than a preset first loss rate, it is determined that the detection stability of the stevioside extraction process does not meet the requirements.

[0038] Specifically, the control module preliminarily determines that the detection accuracy of the stevia extraction process does not meet the requirements when the loss rate of the detection signal is greater than the preset first loss rate and less than or equal to the preset second loss rate, and determines whether the detection accuracy of the stevia extraction process meets the requirements based on the maximum difference in stevia concentration in the extract.

[0039] It can be understood that the three intervals corresponding to the preset first loss rate and the preset second loss rate correspond to three situations respectively:

[0040] The first interval is when the loss rate of the detection signal is greater than the preset first loss rate, corresponding to the situation where the detection stability of the stevioside extraction process meets the requirements;

[0041] The second interval is when the loss rate of the detection signal is greater than the preset first loss rate and less than or equal to the preset second loss rate, corresponding to the situation that the stevioside mixed solution is not fully mixed during the extraction process, the dissolution rate and diffusion rate of stevioside are different, resulting in uneven concentration inside the solution;

[0042] The third interval is when the loss rate of the detection signal is greater than the preset second loss rate, which corresponds to the situation where the line interface of the detection equipment is worn out due to long-term use, resulting in looseness at the line interface, poor contact of the detection equipment, and thus loss of the detected signal.

[0043] In practice, the preset first loss rate is generally selected in the range of [6%, 8%], and the preset second loss rate is generally selected in the range of [9%, 11%].

[0044] Preferably, the preferred embodiment of the preset first loss rate is 7%, and the preferred embodiment of the preset second loss rate is 10%.

[0045] Specifically, the loss rate of the detection signals is the ratio of the number of lost detection signals to the total number of detection signals.

[0046] In implementation, the system of the present invention determines the detection stability of the stevia extraction process by setting a first loss rate and a preset second loss rate, thereby reducing the impact of the decrease in detection accuracy of the stevia extraction process due to inaccurate determination of the detection stability of the stevia extraction process, and further improving the detection stability of the stevia extraction process.

[0047] Specifically, the control module increases the sampling window size of the detection signal when the loss rate of the detection signal is greater than the preset second loss rate;

[0048] The increase range of the sampling window size of the detection signal is determined by the difference between the loss rate of the detection signal and a preset second loss rate.

[0049] Specifically, when the difference between the loss rate of the detection signal and the preset second loss rate is within 3%, the sampling window size of the detection signal is increased to 1.1 times of the original size; when the difference between the loss rate of the detection signal and the preset second loss rate exceeds 3%, the sampling window size of the detection signal increases by 2s for every 2% exceeding it. For example, the difference between the loss rate of the detection signal and the preset second loss rate is 7%, the current sampling window size of the detection signal is 10 seconds, and the increased sampling window size of the detection signal is 10×1.1+2×2=15s.

[0050] In implementation, the system of the present invention determines the sampling window size of the detection signal by setting a first loss rate and a preset second loss rate. Due to long-term use, the line interface of the detection equipment is worn, resulting in looseness at the line interface, resulting in poor contact of the detection equipment, and thus causing the detected signal to be lost. By increasing the sampling window size of the detection signal, the problem caused by signal loss can be alleviated, and the information loss caused by signal loss can be compensated to a certain extent, so that the system can extract as much useful information as possible from the incomplete signal, further improving the detection stability of the stevia extraction process.

[0051] Specifically, the control module is used to obtain the stevioside concentrations in different areas of the same extract, and calculate the maximum difference in the stevioside concentrations in the extract. If the maximum difference in the stevioside concentrations in the extract is greater than a preset first difference, it is determined that the detection accuracy of the stevioside extraction process does not meet the requirements.

[0052] Specifically, when the maximum difference in stevioside concentration in the extract is greater than a preset second difference, it is preliminarily determined that the stability of the detection environment of the stevioside extraction process does not meet the requirements, and whether the stability of the detection environment of the stevioside extraction process meets the requirements is determined based on the temperature fluctuation amplitude during the stevioside extraction process.

[0053] It can be understood that the three intervals corresponding to the preset first difference amount and the preset second difference amount correspond to three situations respectively:

[0054] The first interval is when the maximum difference in stevioside concentration in the extract is greater than the preset first difference, corresponding to the situation where the detection accuracy of the stevioside extraction process meets the requirements;

[0055] The second interval is when the maximum difference in stevioside concentration in the extract is greater than the preset first difference and less than or equal to the preset second difference, corresponding to the situation that the stevioside mixed solution is not fully mixed during the extraction process, the dissolution rate and diffusion rate of stevioside are different, resulting in uneven concentration inside the solution;

[0056] The third interval is when the maximum difference in stevioside concentration in the extract is greater than the preset second difference. This corresponds to a situation in which, during the stevioside extraction process, a heating rod is used to heat the extract. When the insulating layer of the heating rod is damaged, a short circuit occurs, resulting in unstable heating temperature, which affects the extraction of stevioside.

[0057] In practice, the preset first difference amount is generally selected in the range of [11%, 13%], and the preset second difference amount is generally selected in the range of [14%, 16%].

[0058] Preferably, the first difference amount is preset to be 12% and the second difference amount is preset to be 15%.

[0059] Specifically, the maximum difference in stevioside concentration in the extract is the difference between the maximum concentration and the minimum concentration of stevioside in the same extract.

[0060] Specifically, % is the unit of the maximum difference in stevioside concentration, which means mass fraction.

[0061] In implementation, the system of the present invention determines the detection accuracy of the stevia extraction process by setting a preset first difference amount and a preset second difference amount, thereby reducing the impact of the decreased detection stability of the stevia extraction process due to inaccurate determination of the detection accuracy of the stevia extraction process, and further improving the detection stability of the stevia extraction process.

[0062] Specifically, the control module increases the stirring rate of the stevioside mixed solution when the maximum difference in the stevioside concentration in the extract is greater than the preset first difference and less than or equal to the preset second difference.

[0063] Specifically, the increase range of the stirring rate of the stevioside mixed solution is determined by the difference between the maximum difference amount of the stevioside concentration in the extract and the preset first difference amount.

[0064] Specifically, when the difference between the maximum difference in stevioside concentration in the extract and the preset first difference is within 5%, the stirring rate of the stevioside mixed solution is increased to 1.2 times the original; when the difference between the maximum difference in stevioside concentration in the extract and the preset first difference exceeds 5%, the stirring rate of the stevioside mixed solution is increased by 50r / min for every 2% exceeding it. For example, the difference between the maximum difference in stevioside concentration in the extract and the preset first difference is 9%, the current stirring rate of the stevioside mixed solution is 300r / min, and the increased stirring rate of the stevioside mixed solution is 300x1.2+50x2=460r / min.

[0065] In implementation, the system of the present invention determines the stirring rate of the stevioside mixed solution by setting a preset first difference amount and a preset second difference amount. Since the stevioside mixed solution is not fully mixed during the extraction process, the dissolution rate and diffusion rate of stevioside are different, resulting in uneven concentration inside the solution. By increasing the stirring rate of the stevioside mixed solution, the stevioside mixed solution in the high-concentration area can flow to the low-concentration area faster, promoting the diffusion of the solute, thereby reducing the concentration difference and further improving the detection stability of the stevioside extraction process.

[0066] Specifically, the control module is used to obtain the temperature of the stevia extraction process and calculate the temperature fluctuation amplitude during the stevia extraction process. If the temperature fluctuation amplitude during the stevia extraction process is greater than the preset fluctuation amplitude, it is determined that the detection environment stability of the stevia extraction process does not meet the requirements, and the heating interval of the stevia mixed solution is increased.

[0067] It can be understood that the two intervals corresponding to the preset fluctuation range correspond to two situations:

[0068] The first interval is when the temperature fluctuation range during the stevioside extraction process is less than or equal to the preset fluctuation range, corresponding to the situation where the stability of the detection environment during the stevioside extraction process meets the requirements;

[0069] The second interval is when the temperature fluctuation amplitude during the stevia extraction process is greater than the preset fluctuation amplitude. This corresponds to the situation in which a heating rod is used to heat the extract during the stevia extraction process. When the insulation layer of the heating rod is damaged, a short circuit occurs, resulting in unstable heating temperature, which affects the stevia extraction.

[0070] In practice, the preset fluctuation range is generally selected in the range of [4°C, 6°C].

[0071] Preferably, the preset fluctuation range is 5°C.

[0072] Specifically, the temperature fluctuation range during the stevia extraction process is the difference between the maximum temperature and the minimum temperature during the stevia extraction process.

[0073] In implementation, the system of the present invention determines the stability of the detection environment of the stevia extraction process by setting a preset fluctuation amplitude, thereby reducing the impact of the decreased detection stability of the stevia extraction process due to inaccurate determination of the detection environment stability of the stevia extraction process, and further improving the detection stability of the stevia extraction process.

[0074] Specifically, the increase range of the heating interval of the stevioside mixed solution is determined by the difference between the temperature fluctuation range during the stevioside extraction process and the preset fluctuation range.

[0075] Specifically, when the difference between the temperature fluctuation amplitude during stevia extraction and the preset fluctuation amplitude is within 2°C, the heating interval of the stevia mixed solution is increased to 1.5 times the original; when the difference between the temperature fluctuation amplitude during stevia extraction and the preset fluctuation amplitude exceeds 2°C, the heating interval of the stevia mixed solution is increased by 3 minutes for every 1°C increase. For example, the difference between the temperature fluctuation amplitude during stevia extraction and the preset fluctuation amplitude is 6°C. The current heating interval of the stevia mixed solution is 10 minutes, and the increased heating interval of the stevia mixed solution is 10×1.5+3×2=21 minutes.

[0076] In implementation, the system of the present invention determines the heating interval of the stevia mixed solution by setting a preset fluctuation amplitude. Since a heating rod is used to heat the extract during the stevia extraction process, when the insulating layer of the heating rod is damaged, a short circuit occurs, resulting in unstable heating temperature, thereby affecting the stevia extraction. By increasing the heating interval of the stevia mixed solution, the number of heating times per unit time can be reduced, thereby reducing the total heat input, allowing the extract to have more time to dissipate heat naturally, avoiding excessive temperature, and further improving the detection stability of the stevia extraction process.

[0077] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A real-time detection system for stevioside extraction process, characterized in that: include: An extraction module, used for extracting stevioside from an extracting solution, comprising an extraction tank for providing an extraction space for a stevioside mixed solution, a stirrer arranged inside the extraction tank for mixing stevioside raw materials and a solvent to output the extracting solution, and a heating rod connected to the extraction tank for heating the extraction tank; A detection module connected to the extraction module, comprising a concentration sensor disposed at the output end of the extraction tank for detecting the concentration of stevioside in the extract, a temperature sensor connected to the extraction tank for detecting the temperature of the extract in the extraction tank, and a pH sensor disposed inside the extraction tank for detecting the pH value of the extract; A communication module, which is connected to the detection module and is used to verify the collected detection signal and transmit it to the display screen; A control module is connected to the extraction module, the detection module and the communication module respectively, and is used to determine the sampling window size of the detection signal according to the loss rate of the detection signal, or to determine the stirring rate of the stevioside mixed solution according to the maximum difference in the stevioside concentration in the extract, and to determine the heating interval of the stevioside mixed solution according to the maximum difference in the stevioside concentration in the extract and the temperature fluctuation amplitude during the stevioside extraction process.

2. The real-time detection system for stevioside extraction process according to claim 1, characterized in that: The control module is used to determine whether the detection stability of the stevioside extraction process meets the requirements according to the loss rate of the detection signal. If the loss rate of the detection signal is greater than the preset first loss rate, it is determined that the detection stability of the stevioside extraction process does not meet the requirements.

3. The real-time detection system for stevioside extraction process according to claim 2, characterized in that: The control module preliminarily determines that the detection accuracy of the stevioside extraction process does not meet the requirements when the loss rate of the detection signal is greater than the preset first loss rate and less than or equal to the preset second loss rate, and determines whether the detection accuracy of the stevioside extraction process meets the requirements based on the maximum difference in stevioside concentration in the extract.

4. The real-time detection system for stevioside extraction process according to claim 3, characterized in that: The control module increases the sampling window size of the detection signal when the loss rate of the detection signal is greater than the preset second loss rate; The increase range of the sampling window size of the detection signal is determined by the difference between the loss rate of the detection signal and a preset second loss rate.

5. The real-time detection system for stevioside extraction process according to claim 3, characterized in that: The control module is used to determine whether the detection accuracy of the stevioside extraction process meets the requirements based on the maximum difference in stevioside concentration in the extract. If the maximum difference in stevioside concentration in the extract is greater than a preset first difference, it is determined that the detection accuracy of the stevioside extraction process does not meet the requirements.

6. The real-time detection system for stevioside extraction process according to claim 5, characterized in that: When the maximum difference in stevioside concentration in the extract is greater than a preset second difference, it is preliminarily determined that the stability of the detection environment of the stevioside extraction process does not meet the requirements, and whether the stability of the detection environment of the stevioside extraction process meets the requirements is determined based on the temperature fluctuation amplitude during the stevioside extraction process.

7. The real-time detection system for stevioside extraction process according to claim 6, characterized in that: The control module increases the stirring rate of the stevioside mixed solution when the maximum difference in the stevioside concentration in the extract is greater than the preset first difference and less than or equal to the preset second difference.

8. The real-time detection system for stevioside extraction process according to claim 7, characterized in that: The increase range of the stirring rate of the stevioside mixed solution is determined by the difference between the maximum difference amount of the stevioside concentration in the extract and the preset first difference amount.

9. The real-time detection system for stevioside extraction process according to claim 8, characterized in that: The control module is used to determine whether the stability of the detection environment of the stevia extraction process meets the requirements according to the temperature fluctuation amplitude during the stevia extraction process. If the temperature fluctuation amplitude during the stevia extraction process is greater than the preset fluctuation amplitude, it is determined that the stability of the detection environment of the stevia extraction process does not meet the requirements, and the heating interval of the stevia mixed solution is increased.

10. The real-time detection system for stevioside extraction process according to claim 9, characterized in that: The increase range of the heating interval of the stevioside mixed solution is determined by the difference between the temperature fluctuation range during the stevioside extraction process and the preset fluctuation range.

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