A storage method for concentrated onion juice

Abstract

The present invention relates to a storage method for concentrated onion juice, comprising: placing the concentrated onion juice in a plurality of storage tanks, setting a detection cycle of the concentrated onion juice; detecting the internal temperature of the storage tank, drawing a temperature change curve, comparing the temperature value with a preset internal temperature, and adjusting the temperature expression parameter of the temperature change curve; calculating the integral value of the temperature change curve and the preset internal temperature within a unit detection time, and adjusting the detection cycle accordingly according to the integral value; detecting the light transmittance and soluble solid content of the concentrated onion juice, comparing them with standard values, making a grade judgment on the storage state of the concentrated onion juice, and adjusting the detection cycle accordingly; detecting the storage time of the concentrated onion juice, comparing it with the preset storage time, and calculating the adjusted detection cycle. The present invention makes the storage detection of onion juice more intelligent.

Description

Technical Field

[0001] The invention relates to the technical field of liquid storage, and in particular to a storage method for concentrated onion juice. Background Art

[0002] Since onions are prone to bulb sprouting and rotting during the harvest and storage process, they are processed into products such as onion slices, onion powder, onion paste, and concentrated onion juice to extend the storage period and expand the channels for deep processing of onions. During the processing and storage of concentrated onion juice, the differences in ionic charge properties of the rich phenolic compounds, proteins, pectin, cellulose, starch and other macromolecular substances in it lead to flocculation and sedimentation, making the concentrated onion juice prone to turbidity and secondary precipitation, which seriously limits the commercial value of the concentrated onion juice. Clarification treatment, as a key link in the production process of concentrated onion juice products, plays a significant role in the storage, stability and quality characteristics of concentrated onion juice.

[0003] Chinese patent publication number: CN102972713A discloses a fermentation production method of onion juice, which relates to the field of agricultural and sideline product processing. The following production scheme is adopted: peeling, removing the head and root of the onion, washing, and frying; adding NaCl, adding NaCl to the crushed material; fermenting naturally in a fermentation tank, placing the above-mentioned onion crushed material in a constant temperature box at 30-35°C for fermentation; centrifugal filtration, centrifuging the fermented material to obtain onion fermented juice; storage, adding β-cyclodextrin to the fermented onion juice, and storing at room temperature for standby use.

[0004] It can be seen that the prior art has the problem that during the processing and storage of concentrated onion juice, the difference in ionic charge properties of the rich phenolic compounds, proteins, pectin, cellulose, starch and other macromolecular substances in the concentrated onion juice leads to flocculation and sedimentation, making the concentrated onion juice prone to turbidity and secondary precipitation. Summary of the invention

[0005] To this end, the present invention provides a storage method for concentrated onion juice, which is used to overcome the problem in the prior art that during the processing and storage of concentrated onion juice, the differences in ionic charge properties of the rich phenolic compounds, proteins, pectin, cellulose, starch and other macromolecular substances in the concentrated onion juice lead to flocculation and sedimentation, making the concentrated onion juice prone to turbidity and secondary precipitation.

[0006] To achieve the above object, the present invention provides a storage method for concentrated onion juice, comprising the following steps:

[0007] The concentrated onion juice is placed in a number of storage tanks, and a detection cycle of the concentrated onion juice is set;

[0008] Detect the internal temperature of the storage tank, draw a temperature change curve inside the storage tank based on the detection data, compare the temperature value of the temperature change curve with the preset internal temperature, and adjust the temperature expression parameters of the temperature change curve based on the comparison result;

[0009] Calculate the integral value of the internal temperature change curve of the storage tank within the unit detection time and the preset internal temperature, judge the internal temperature state of the tank according to the integral value, and adjust the concentrated onion juice detection cycle accordingly;

[0010] Detecting the light transmittance of the concentrated onion juice and the soluble solid content in the concentrated onion juice, comparing the measured light transmittance of the concentrated onion juice and the soluble solid content in the concentrated onion juice with the standard value, making a grade judgment on the storage state of the concentrated onion juice according to the comparison result, and adjusting the detection cycle of the concentrated onion juice accordingly;

[0011] Detecting the storage time of the concentrated onion juice in the storage tank, comparing the storage time with the preset storage time, and calculating the adjusted detection cycle according to the comparison result;

[0012] Detect the ambient temperature of the storage tank, compare the ambient temperature with the preset maximum ambient temperature, and control the operating state of the condenser on the surface of the storage tank body according to the comparison result.

[0013] Furthermore, when drawing the temperature change curve inside the storage tank according to the detection data, the temperature expression parameters of the temperature change curve are preset, and the real-time temperature of the temperature change curve is analyzed, and the value range of the detection time is determined according to the analysis results;

[0014] At any time point within the detection time, if the temperature of the temperature change curve is less than or equal to the preset internal temperature, the temperature expression parameter is zero; if the temperature of the temperature change curve is greater than the preset internal temperature, the temperature expression parameter is the preset value, and the temperature expression parameter is positively correlated with the difference between the temperature change curve and the preset internal temperature.

[0015] Further, when judging the internal temperature state of the tank body according to the integral value of the internal temperature change curve of the storage tank within the unit detection time and the preset internal temperature, if the integral value is less than or equal to zero, it is judged that the internal temperature of the tank body is moderate and the storage temperature of the concentrated onion juice in the tank body is normal; if the integral value is greater than zero, it is judged that the internal temperature of the tank body is high, and the adjusted concentrated onion juice detection cycle is calculated according to the integral value and the internal preset temperature;

[0016] Among them, if the integral value is much greater than zero, it is judged that the temperature inside the tank is too high, which has a serious impact on the storage of concentrated onion juice, and the artificial cooling system instruction is sent to the management personnel.

[0017] Further, the concentrated onion juice is scored for quality based on the test data. If the soluble solid content in the concentrated onion juice meets the food safety standard, the concentrated onion juice is determined to be in a qualified storage state.

[0018] Among them, if the concentrated onion juice is in a clear state, the concentrated onion juice is marked as a first-level qualified storage state, and the increased concentrated onion juice detection cycle is calculated based on the light transmittance and the standard light transmittance; if the concentrated onion juice is in a turbid state, the concentrated onion juice is marked as a second-level qualified storage state, and the reduced concentrated onion juice detection cycle is calculated based on the light transmittance and the standard light transmittance;

[0019] If the soluble solids content in the concentrated onion juice does not meet the food safety standards, the concentrated onion juice is judged to be in an unqualified storage state and the management personnel will be notified for processing.

[0020] Further, the preset storage time is divided into a first preset storage time and a second preset storage time;

[0021] When comparing the storage time with the preset storage time, if the storage time is less than or equal to the preset storage time, it is judged that the storage time of the concentrated onion juice has not exceeded the shelf life; if the storage time is greater than the preset storage time, it is judged that the storage time of the concentrated onion juice exceeds the shelf life, and a signal is sent to notify the management personnel to discharge the concentrated onion juice in the storage tank. If the storage time is between the first preset storage time and the second preset storage time, the adjusted detection period is calculated based on the storage time and the preset storage time.

[0022] Furthermore, the transmittance of the concentrated onion juice is detected by an ultraviolet-visible spectrophotometer. When the transmittance of the concentrated onion juice is compared with the standard transmittance, if the transmittance is greater than or equal to the standard transmittance, the concentrated onion juice is judged to be clear; if the transmittance is less than the standard transmittance, the concentrated onion juice is judged to be turbid.

[0023] Furthermore, when the concentrated onion juice is relatively turbid, a chemical clarifier chitosan is added to the storage tank through a circulation device, and the rotation speed of the rotating shaft is adjusted according to the ratio of the transmittance of the concentrated onion juice to the standard transmittance, and the rotating shaft is controlled to drive the membrane reactor to rotate.

[0024] Furthermore, by testing the soluble solids content in the concentrated onion juice with an edible digital saccharimeter and comparing the soluble solids content in the concentrated onion juice with the standard soluble solids content in the concentrated onion juice, if the soluble solids content is greater than or equal to the standard soluble solids content, then the soluble solids content in the concentrated onion juice is judged to meet the food safety standards; if the soluble solids content is less than the standard soluble solids content, then the soluble solids content in the concentrated onion juice is judged to not meet the food safety standards.

[0025] Furthermore, when the ambient temperature is compared with the preset maximum ambient temperature, if the ambient temperature is less than or equal to the preset maximum ambient temperature, it is judged that the ambient temperature of the storage tank is moderate and the concentrated onion juice can be stored normally; if the ambient temperature is greater than the preset maximum ambient temperature, it is judged that the ambient temperature of the storage tank is too high, which has an adverse effect on the storage of concentrated onion juice, and the condensation device on the surface of the storage tank is started.

[0026] Furthermore, compared with the prior art, the beneficial effect of the present invention is that the internal temperature of the storage tank directly affects the temperature of the concentrated onion juice. If the internal temperature of the storage tank is not detected in real time, the storage state of the concentrated onion juice will be greatly affected when the temperature is too high, thereby shortening the deterioration time of the concentrated onion juice. The present invention draws a temperature change curve according to the detected internal temperature of the tank body, and calculates the integral value of the temperature change curve and the preset internal temperature within the detection time. By adjusting the detection cycle of the concentrated onion juice accordingly according to the integral value, the detection frequency of the concentrated onion juice is increased, the deterioration probability of the concentrated onion juice is reduced, and a warning signal is sent when the internal temperature of the tank body is too high to notify the management personnel to take cooling measures in time.

[0027] Furthermore, concentrated onion juice will undergo different state changes during storage due to various element differences generated during the preparation and transportation process as well as the storage time. The present invention determines whether the quality of concentrated onion juice meets national standards based on the clarity and soluble solids content of the concentrated onion juice, and divides the storage state of the concentrated onion juice, thereby increasing the accuracy of the storage method.

[0028] Furthermore, the closer the storage time of the concentrated onion juice is to the preset storage time, the higher the possibility of the concentrated onion juice deteriorating is. The present invention adjusts the detection period of the concentrated onion juice accordingly according to whether the current storage time of the concentrated onion juice is in the first preset storage time or the second preset storage time, thereby shortening the detection frequency, reducing the possibility of the concentrated onion juice deteriorating, avoiding unnecessary loss of the concentrated onion juice, and improving the practicability of the storage method.

[0029] Furthermore, using the naked eye to detect the clarity of concentrated onion juice is often affected by environmental factors such as light, resulting in inaccurate and unstable detection results. The present invention determines the clarity of concentrated onion juice by detecting the transmittance of the concentrated onion juice, thereby reducing the error value generated in the detection process and increasing the accuracy and stability of the storage method.

[0030] Furthermore, the present invention adds a chemical clarifier chitosan during the storage process to clarify the concentrated onion juice. Under sufficient stirring, the chitosan neutralizes the positive and negative charges that destroy the stability of the concentrated onion juice, and causes the suspended matter in the concentrated onion juice to be adsorbed on the surface of the chitosan to produce a flocculation effect, thereby achieving the purpose of clarifying the concentrated onion juice. Compared with the physical clarification method and the enzyme clarification method currently used at home and abroad, the chitosan method has a good clarification effect, a low nutrient loss, and a shortest action time. In addition, chitosan has antibacterial and antiseptic effects, and can effectively extend the shelf life of the concentrated onion juice.

[0031] Furthermore, concentrated onion juice will undergo different state changes during storage due to various element differences generated during the preparation and transportation process as well as the storage time. The present invention determines whether the quality of concentrated onion juice meets national standards based on the clarity and soluble solids content of the concentrated onion juice, and divides the storage state of the concentrated onion juice, thereby increasing the accuracy of the storage method.

[0032] Furthermore, if the ambient temperature of the storage tank is too high, the storage temperature of the concentrated onion juice in the storage tank will increase, shortening the deterioration time of the concentrated onion juice. The present invention determines whether the ambient temperature is too high by comparing the ambient temperature of the storage tank detected by the detection device with the preset maximum ambient temperature, and starts the condensation device on the surface of the storage tank body when the external temperature is too high, thereby reducing the storage temperature of the concentrated onion juice in the storage tank, avoiding the concentrated onion juice from deteriorating faster under the influence of temperature, and improving the reliability of the storage method. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A step diagram of a storage method for concentrated onion juice according to the present invention;

[0034] Figure 2 This is a flow chart of adjusting the detection cycle according to the internal temperature of the storage tank according to an embodiment of the present invention;

[0035] Figure 3 This is a flow chart of adjusting the detection period according to the quality level according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] See also Figure 1 As shown in the step diagram of a storage method for concentrated onion juice of the present invention, the present invention provides a storage method for concentrated onion juice, comprising the following steps:

[0041] Step S1, placing the concentrated onion juice in a plurality of storage tanks, and setting a detection cycle for the concentrated onion juice;

[0042] Step S2, detecting the internal temperature of the storage tank, drawing a temperature change curve inside the storage tank according to the detection data, comparing the temperature value of the temperature change curve with the preset internal temperature, and adjusting the temperature expression parameter of the temperature change curve according to the comparison result;

[0043] Step S3, calculating the integral value of the internal temperature change curve of the storage tank within the unit detection time and the preset internal temperature, judging the internal temperature state of the tank body according to the integral value, and adjusting the concentrated onion juice detection cycle accordingly;

[0044] Step S4, detecting the light transmittance of the concentrated onion juice and the soluble solid content in the concentrated onion juice, comparing the measured light transmittance of the concentrated onion juice and the soluble solid content in the concentrated onion juice with the standard values, determining the storage state of the concentrated onion juice according to the comparison results, and adjusting the detection cycle of the concentrated onion juice accordingly;

[0045] Step S5, detecting the storage time of the concentrated onion juice in the storage tank, comparing the storage time with a preset storage time, and calculating an adjusted detection cycle according to the comparison result;

[0046] Step S6, detecting the ambient temperature of the storage tank, comparing the ambient temperature with a preset maximum ambient temperature, and controlling the operating state of the condenser on the surface of the storage tank body according to the comparison result.

[0047] See also Figure 2 As shown in the flowchart of adjusting the detection cycle according to the internal temperature of the storage tank according to the embodiment of the present invention,

[0048] In this embodiment, the detection period t0 is a variable value, and its degree of variation is related to the internal temperature C0 of the storage tank and the quality of the concentrated onion juice sampled;

[0049] Furthermore, the internal temperature C0 of the storage tank is detected, and a temperature change curve f(x) of the internal temperature of the storage tank is drawn according to the detection data, and the temperature expression parameter of the temperature change curve is set to α;

[0050] Analyze the real-time temperature of the temperature change curve, and determine the value range of the detection time according to the analysis results;

[0051] If f(ti)≤Ce, then α=α1;

[0052] If f(ti)>Ce, then α=α2;

[0053] Where f(ti) is the temperature value of the temperature change curve at any time point ti, α1=0, α2 is the preset value of the temperature expression parameter, and α2 is positively correlated with the difference between the temperature change curve and the preset internal temperature;

[0054] Assume that the integral value of the change curve of the internal temperature C0 of the storage tank within the unit detection time and the preset internal temperature Ce is △C0, and the detection time interval is [ta, tb], △C0= ;

[0055] Determine the internal temperature state of the tank according to △C0, and adjust the concentrated onion juice detection cycle accordingly;

[0056] If △C0≤0, it is judged that the temperature inside the tank is moderate and the storage temperature of the concentrated onion juice inside the tank is normal;

[0057] If △C0>0, it is judged that the internal temperature of the tank is high, and the detection period of concentrated onion juice is adjusted. The adjusted detection period t1=t01-△C0÷Ce×t0×b1, where b1 is the calculation compensation parameter for adjusting the detection period;

[0058] Among them, if △C0>>0, it is judged that the internal temperature of the tank is too high, which has a serious impact on the storage of concentrated onion juice, and the artificial cooling system instruction is sent to the management personnel.

[0059] Specifically, the internal temperature of the storage tank directly affects the temperature of the concentrated onion juice. If the internal temperature of the storage tank is not detected in real time, the storage state of the concentrated onion juice will be greatly affected when the temperature is too high, shortening the deterioration time of the concentrated onion juice. The present invention draws a temperature change curve according to the detected internal temperature of the tank body, and calculates the integral value of the temperature change curve and the preset internal temperature within the detection time. By adjusting the detection period of the concentrated onion juice according to the integral value, the detection frequency of the concentrated onion juice is increased, the deterioration probability of the concentrated onion juice is reduced, and a warning signal is sent when the internal temperature of the tank body is too high to notify the management personnel to take cooling measures in time.

[0060] For further information, see Figure 3 As shown in the flowchart of the detection cycle according to the internal temperature adjustment of the storage tank described in the embodiment of the present invention, the clarity of the concentrated onion juice, that is, the light transmittance P of the concentrated onion juice and the soluble solid content G in the concentrated onion juice are detected, and the quality score of the concentrated onion juice is given according to the detection results;

[0061] If G>Ge, the data analysis unit determines that the concentrated onion juice is in a qualified storage state, and adjusts the detection cycle of the concentrated onion juice according to the qualified level;

[0062] If P≥Pe, the data analysis unit marks the concentrated onion juice as a first-level qualified storage state, and the absolute value of the difference between the transmittance P and the standard transmittance Pe is set to P1, and the concentrated onion juice detection period t1=t01+P1÷Pe×t0;

[0063] If P<Pe, the data analysis unit marks the concentrated onion juice as a second-level qualified storage state, and the concentrated onion juice detection period t1=t01-P1÷Pe×t0;

[0064] If G<Ge, the data analysis unit determines that the concentrated onion juice is in an unqualified storage state and notifies the management personnel to handle it.

[0065] Specifically, concentrated onion juice will undergo different state changes during storage due to various element differences generated during the preparation and transportation process as well as the storage time. The present invention determines whether the quality of the concentrated onion juice meets the national standards based on the clarity and soluble solids content of the concentrated onion juice, and divides the storage state of the concentrated onion juice, thereby increasing the accuracy of the storage method.

[0066] The preset storage time te is divided into a first preset storage time te1 and a second preset storage time te2, wherein the first preset storage time te1 is the first 60% of the current preset storage time te.

[0067] The storage time of the concentrated onion juice in the storage tank is detected to be t1, and the storage state of the concentrated onion juice is determined by comparing the storage time t1 with the preset storage time te;

[0068] If t1≤te, it is judged that the storage time of the concentrated onion juice has not exceeded the shelf life;

[0069] If te1<t1<te2, the detection period t0 is adjusted, and the adjusted detection period t01=te1÷t1×t0;

[0070] If t2>te, it is determined that the storage time of the concentrated onion juice exceeds the shelf life, and a signal is sent to notify the management personnel to discharge the concentrated onion juice in the storage tank.

[0071] Specifically, the closer the storage time of the concentrated onion juice is to the preset storage time, the higher the possibility of the concentrated onion juice deteriorating. The present invention adjusts the detection period of the concentrated onion juice accordingly according to whether the current storage time of the concentrated onion juice is in the first preset storage time or the second preset storage time, thereby shortening the detection frequency, reducing the possibility of the concentrated onion juice deteriorating, avoiding unnecessary loss of the concentrated onion juice, and improving the practicability of the storage method.

[0072] Furthermore, a small amount of clarified samples were extracted from the storage tank, and the absorbance of the concentrated onion juice was measured at a wavelength of 630 nm using an ultraviolet-visible spectrophotometer and distilled water as a reference. The absorbance was then converted into transmittance, and the clarity of the concentrated onion juice was expressed by the transmittance P (%). The state of the concentrated onion juice was determined by comparing the transmittance P of the concentrated onion juice with the standard transmittance Pe.

[0073] If P ≥ Pe, the concentrated onion juice is judged to be in a clear state;

[0074] If P < Pe, the concentrated onion juice is judged to be turbid. The circulation device is controlled to add the chemical clarifier chitosan, and the rotating shaft is controlled to drive the membrane reactor to rotate. An optimal chitosan clarification process condition combination is provided. The chitosan solution addition amount is 0.4 g / L, the water bath insulation temperature is 40 ℃, and the water bath insulation time is 50 min. The light transmittance of the clarification result of this process is 95.82%.

[0075] Furthermore, the control device drives the rotating shaft to rotate the membrane reactor at an initial rotation speed V0, and adjusts the rotating shaft speed according to the ratio of the concentrated onion juice transmittance P to the standard transmittance Pe. The adjusted rotating shaft speed is assumed to be V1, V1=Pe÷P×V0×a1, wherein a1 is a calculation compensation parameter for increasing the rotating shaft speed when the concentrated onion juice transmittance P is less than the standard transmittance Pe.

[0076] Specifically, using the naked eye to detect the clarity of concentrated onion juice is often affected by environmental factors such as light, resulting in inaccurate and unstable detection results. The present invention determines the clarity of concentrated onion juice by detecting the light transmittance of the concentrated onion juice through a detection device, thereby reducing the error value generated during the detection process and increasing the accuracy and stability of the storage method.

[0077] The invention adopts the method of adding a chemical clarifier chitosan during storage to clarify the concentrated onion juice. Under sufficient stirring, the chitosan neutralizes the positive and negative charges that destroy the stability of the concentrated onion juice, and promotes the adsorption of suspended matter in the concentrated onion juice on the surface of the chitosan to produce flocculation, so as to achieve the purpose of clarifying the concentrated onion juice. Compared with the physical clarification method and the enzyme clarification method currently used at home and abroad, the chitosan method has a good clarification effect, a low nutrient loss, and a shortest action time. In addition, the chitosan has antibacterial and antiseptic effects, and can effectively prolong the shelf life of the concentrated onion juice.

[0078] Furthermore, a small amount of sample was extracted from the storage tank, and the soluble solid content G in the concentrated onion juice was detected using an edible digital saccharimeter. By comparing the soluble solid content G in the concentrated onion juice with the standard soluble solid content Ge in the concentrated onion juice, the minimum soluble solid content in the concentrated onion juice of this embodiment was 14b, and the state of the concentrated onion juice was determined;

[0079] If G≥Ge, it is judged that the soluble solid content in the concentrated onion juice meets the food safety standard;

[0080] If G<Ge, it is judged that the soluble solid content in the concentrated onion juice does not meet the food safety standards.

[0081] Specifically, concentrated onion juice will undergo different state changes during storage due to various element differences generated during the preparation and transportation process as well as the storage time. The present invention determines whether the quality of the concentrated onion juice meets the national standards based on the clarity and soluble solids content of the concentrated onion juice, and divides the storage state of the concentrated onion juice, thereby increasing the accuracy of the storage method.

[0082] Furthermore, the detection device detects the ambient temperature C1 of the storage tank and transmits the detection data to the data analysis unit, and the data analysis unit compares the ambient temperature C1 with the preset maximum ambient temperature Ce1;

[0083] If C1≤Ce, the data analysis unit determines that the ambient temperature of the storage tank is moderate and the concentrated onion juice can be stored normally;

[0084] If C1>Ce, the data analysis unit determines that the ambient temperature of the storage tank is too high, which has an adverse effect on the storage of concentrated onion juice, and starts the condensation device on the surface of the storage tank.

[0085] Specifically, if the ambient temperature of the storage tank is too high, the storage temperature of the concentrated onion juice in the storage tank will increase, and the deterioration time of the concentrated onion juice will be accelerated. The present invention determines whether the ambient temperature is too high by comparing the ambient temperature of the storage tank detected by the detection device with the preset maximum ambient temperature, and starts the condensation device on the surface of the storage tank body when the external temperature is too high, thereby reducing the storage temperature of the concentrated onion juice in the storage tank, avoiding the concentrated onion juice from deteriorating faster under the influence of temperature, and improving the reliability of the storage method.

[0086] 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.

[0087] 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 storage method for concentrated onion juice, characterized in that: The following steps are involved: Step S1, placing the concentrated onion juice in a plurality of storage tanks, and setting a detection cycle for the concentrated onion juice; Step S2, detecting the internal temperature of the storage tank, drawing a temperature change curve inside the storage tank according to the detection data, comparing the temperature value of the temperature change curve with the preset internal temperature, and adjusting the temperature expression parameter of the temperature change curve according to the comparison result; Step S3, calculating the integral value of the internal temperature change curve of the storage tank within the unit detection time and the preset internal temperature, judging the internal temperature state of the tank body according to the integral value, and adjusting the concentrated onion juice detection cycle accordingly; Step S4, detecting the light transmittance of the concentrated onion juice and the soluble solid content in the concentrated onion juice, comparing the measured light transmittance of the concentrated onion juice and the soluble solid content in the concentrated onion juice with the standard values, determining the storage state of the concentrated onion juice according to the comparison results, and adjusting the detection cycle of the concentrated onion juice accordingly; Step S5, detecting the storage time of the concentrated onion juice in the storage tank, comparing the storage time with a preset storage time, and calculating an adjusted detection cycle according to the comparison result; Step S6, detecting the ambient temperature of the storage tank, comparing the ambient temperature with a preset maximum ambient temperature, and controlling the operating state of the condenser on the surface of the storage tank body according to the comparison result; When drawing the temperature change curve inside the storage tank according to the detection data, the temperature expression parameters of the temperature change curve are preset, and the real-time temperature of the temperature change curve is analyzed, and the value range of the detection time is determined according to the analysis results; At any time point within the detection time, if the temperature of the temperature change curve is less than or equal to the preset internal temperature, the temperature expression parameter is zero; if the temperature of the temperature change curve is greater than the preset internal temperature, the temperature expression parameter is the preset value, and the temperature expression parameter is positively correlated with the difference between the temperature change curve and the preset internal temperature; When judging the internal temperature state of the tank body according to the integral value of the internal temperature change curve of the storage tank within the unit detection time and the preset internal temperature, if the integral value is less than or equal to zero, it is judged that the internal temperature of the tank body is moderate, and the storage temperature of the concentrated onion juice in the tank body is normal; If the integral value is greater than zero, it is determined that the internal temperature of the tank is high, and the adjusted concentrated onion juice detection cycle is calculated based on the integral value and the internal preset temperature; Among them, if the integral value is much greater than zero, it is judged that the temperature inside the tank is too high, which has a serious impact on the storage of concentrated onion juice, and the artificial cooling system instruction is sent to the management personnel.

2. A storage method for concentrated onion juice according to claim 1, characterized in that: The concentrated onion juice is scored for quality based on the test data. If the soluble solid content in the concentrated onion juice meets the food safety standard, the concentrated onion juice is judged to be in a qualified storage state; if the soluble solid content in the concentrated onion juice does not meet the food safety standard, the concentrated onion juice is judged to be in an unqualified storage state, and the management personnel are notified to handle it; The light transmittance of the concentrated onion juice is detected by an ultraviolet-visible spectrophotometer, and when the light transmittance of the concentrated onion juice is compared with the standard light transmittance, if the light transmittance is greater than or equal to the standard light transmittance, the concentrated onion juice is judged to be in a clear state; if the light transmittance is less than the standard light transmittance, the concentrated onion juice is judged to be in a turbid state; Among them, if the concentrated onion juice is in a clear state, the concentrated onion juice will be marked as a first-level qualified storage state, and the increased concentrated onion juice detection period will be calculated based on the transmittance and the standard transmittance; if the concentrated onion juice is in a turbid state, the concentrated onion juice will be marked as a second-level qualified storage state, and the reduced concentrated onion juice detection period will be calculated based on the transmittance and the standard transmittance.

3. A storage method for concentrated onion juice according to claim 2, characterized in that: Dividing the preset storage time into a first preset storage time and a second preset storage time; If the storage time is between the first preset storage time and the second preset storage time, the adjusted detection period is calculated according to the storage time and the preset storage time.

4. A storage method for concentrated onion juice according to claim 3, characterized in that: When comparing the storage time with the preset storage time, if the storage time is less than or equal to the preset storage time, it is determined that the storage time of the concentrated onion juice does not exceed the shelf life; If the storage time is longer than the preset storage time, it is determined that the storage time of the concentrated onion juice exceeds the shelf life, and a signal is sent to notify the management personnel to discharge the concentrated onion juice in the storage tank.

5. A storage method for concentrated onion juice according to claim 4, characterized in that: When the concentrated onion juice is turbid, the chemical clarifier chitosan is added to the storage tank through the circulation device, and the rotation speed of the rotating shaft is adjusted according to the ratio of the light transmittance of the concentrated onion juice to the standard light transmittance, and the rotating shaft is controlled to drive the membrane reactor to rotate.

6. A storage method for concentrated onion juice according to claim 5, characterized in that: The soluble solids content in the concentrated onion juice is tested by using an edible digital saccharimeter. When the soluble solids content in the concentrated onion juice is compared with the standard content of soluble solids in concentrated onion juice, if the soluble solids content is greater than or equal to the standard content of soluble solids, then the soluble solids content in the concentrated onion juice is judged to meet the food safety standards; if the soluble solids content is less than the standard content of soluble solids, then the soluble solids content in the concentrated onion juice is judged to not meet the food safety standards.

7. A storage method for concentrated onion juice according to claim 6, characterized in that: When comparing the ambient temperature with the preset maximum ambient temperature, if the ambient temperature is less than or equal to the preset maximum ambient temperature, it is judged that the ambient temperature of the storage tank is moderate and the concentrated onion juice can be stored normally; if the ambient temperature is greater than the preset maximum ambient temperature, it is judged that the ambient temperature of the storage tank is too high, which has an adverse effect on the storage of concentrated onion juice, and the condensation device on the surface of the storage tank is started.

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