Composite PEF electric field preservation system for food raw materials

Abstract

The invention discloses a composite PEF electric field preservation system for food raw materials, and relates to the technical field of food raw material preservation, the composite PEF electric field preservation system comprises a preservation box body and a closed box cover, a gas mixer is fixedly arranged in the middle of the upper end of the closed box cover in a closed mode, a transportation unit is arranged on the rear portion of the preservation box body, and a gas storage unit is arranged on the upper portion of the transportation unit; a gas adjusting unit is arranged at the upper part of the gas mixer; an electrostatic field generating unit is arranged on the outer side of the fresh-keeping box body; a detection unit is fixedly arranged on the right side of the fresh-keeping box body; and a control device is fixedly arranged on the front side of the fresh-keeping box body. An electrostatic field is released through a high-voltage electrostatic generator and an electrode plate in the electrostatic field generation unit, the intensity and frequency of the electrostatic field are dynamically adjusted, and stubborn microorganisms such as lactic acid bacteria and molds in raw materials can be actively killed; through the gas storage unit and the gas adjusting unit, the three gases enter the gas mixer according to a preset proportion to be fully mixed, and the gas environment is ensured to be stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of food raw material preservation, in particular to a composite PEF electric field preservation system for food raw materials. BACKGROUND

[0002] At present, the preservation of ice cream raw materials mainly relies on low-temperature refrigeration technology, the core principle of which is to control the storage environment temperature in the range of 0℃ to 4℃, significantly inhibit the reproduction rate of microorganisms and the activity of enzyme reaction, thereby delaying the deterioration of raw materials and prolonging the shelf life. Due to the advantages of high equipment popularity, simple operation process, low initial investment and operation and maintenance cost, this technology has become the basic means of ice cream raw material preservation in the food industry. In the transportation link of ice cream raw materials, in order to ensure the uninterrupted low-temperature environment, cold chain vehicles are generally used as transportation carriers in the industry. The temperature inside the vehicle compartment is maintained stable by the vehicle-mounted refrigeration system of the cold chain vehicle, so as to realize the preliminary preservation requirement of raw materials from the production end to the processing end.

[0003] The existing ice cream raw material preservation mode with low-temperature refrigeration and cold chain transportation as the core has the following problems in actual application. The cold chain vehicle can only realize basic temperature control. Under long-term low-temperature environment, the free water in the ice cream raw materials is easy to condense into irregular ice crystals. These ice crystals can damage the cell structure of the raw materials, resulting in the loss of key nutrients such as vitamins and active proteins. After thawing, the raw materials are easy to stratify and have loose texture, which directly affects the taste of the final ice cream. Low-temperature refrigeration can only inhibit the reproduction of microorganisms, but cannot kill the existing stubborn microorganisms in the raw materials. If there is temperature fluctuation in the cold chain transportation, the microorganisms are easy to recover activity and reproduce in large quantities, accelerating the deterioration of the raw materials and even causing safety hazards. The cold chain vehicle compartment lacks a gas environment regulation mechanism. High oxygen concentration can cause oxidation and browning of fat, pigment and other components in the raw materials. The accumulation of carbon dioxide produced by the respiration of the raw materials can cause imbalance of acidity, further damaging the flavor and processing adaptability of the raw materials. Therefore, it is necessary to design a composite PEF electric field preservation system for food raw materials to solve the above problems. SUMMARY

[0004] To achieve the above purpose, the following technical scheme is adopted. A composite PEF electric field preservation system for food raw materials, comprising a preservation box body and a sealed box cover, a gas mixer is fixedly arranged at the upper middle part of the sealed box cover, a transportation unit is arranged at the rear of the preservation box body, a gas storage unit is arranged at the upper part of the transportation unit, and a gas regulation unit is arranged at the upper part of the gas mixer. The gas mixer, the gas regulation unit and the gas storage unit are used to accurately deliver and mix oxygen, carbon dioxide and nitrogen into the preservation box body in different proportions, so as to ensure that the gas environment quickly reaches the set value. The outer side of the fresh-keeping box body is provided with an electrostatic field generating unit, which is used to generate a high-voltage electrostatic field to maximize sterilization of the inside of the fresh-keeping box body and food raw materials. The right side of the fresh-keeping box body is fixedly provided with a detection unit, which is used to monitor the temperature in the fresh-keeping box body in real time and maintain the constant temperature condition during storage. The front side of the fresh-keeping box body is fixedly provided with a control device, which is used for unified automatic management to automatically adjust the outside of the fresh-keeping box body. The fixed unit is used to fix the gas storage unit and the transport vehicle body to prevent the movement of the gas storage unit.

[0005] Preferably, the gas storage unit includes an oxygen cylinder, a carbon dioxide cylinder and a nitrogen cylinder. The gas regulating unit includes three first control valves, second control valves and gas delivery pipes. The three first control valves are fixedly provided with the output ends of the oxygen cylinder, the carbon dioxide cylinder and the nitrogen cylinder, respectively. The three second control valves are fixedly provided on the upper part of the gas mixer. The three first control valves and the second control valves are connected through corresponding gas delivery pipes. The outer side of the gas delivery pipe is provided with a gas flow meter and a one-way electromagnetic valve. The outer side of the first control valve is also fixedly provided with a pressure gauge.

[0006] Preferably, the electrostatic field generating unit includes a high-voltage electrostatic generator and two electrode plates. The high-voltage electrostatic generator is fixedly provided on the back side of the fresh-keeping box body. The upper parts of the two electrode plates are provided with insulating sleeves. The insulating sleeves are provided on the left and right sides of the upper part of the sealed box cover. The outer sides of the electrode plates are attached to the inner left and right ends of the fresh-keeping box body.

[0007] Preferably, the detection unit includes a mounting plate fixedly connected to the right side of the fresh-keeping box body. The right end of the mounting plate is provided with a fixed cylinder. The inside of the fixed cylinder is embedded with a temperature monitor. The upper and lower ends of the fixed cylinder are provided with threaded columns. The outer sides of the temperature monitor are provided with first threaded holes at the upper and lower ends. The threaded columns and the first threaded holes are connected through bolts.

[0008] Preferably, the transport unit includes a transport plate. Three limiting sleeves are equidistantly arranged on the upper part of the transport plate. A handle is arranged on the rear upper end of the transport plate. Four universal wheels are fixedly arranged at the four corners of the bottom of the transport plate.

[0009] Preferably, the fixed unit includes a rear half sleeve and a front half sleeve. The left and right ends of the rear half sleeve and the front half sleeve are provided with side ears. The middle parts of the side ears are provided with connecting bolts. The outer sides of the connecting bolts are threadedly connected with lock nuts.

[0010] Preferably, the rear half cover and the front half cover are each a three continuous semi-circular ring body, the left and right ends of the rear part of the rear half cover are provided with connecting plates and connecting columns, the left and right ends of the rear part of the rear half cover and the front side of the connecting plate are provided with second threaded holes, and the front and rear ends of the connecting column are threadedly connected with the corresponding second threaded holes.

[0011] Preferably, the upper end of each of the two electrode plates is provided with an electrode column, the electrode column is protrudingly arranged in the middle part of the upper end of the corresponding insulating sleeve, the left and right sides of the high-voltage electrostatic generator are electrically connected with connecting cables, and the front end of each of the connecting cables is electrically connected with the corresponding electrode column. The front and rear ends of the outer side of the insulating sleeve are provided with fixed side plates, and the fixed side plates are fixedly connected with the left and right sides of the front and rear ends of the fresh-keeping box body through bolts.

[0012] Preferably, the rear end of the temperature monitor passes through the mounting plate and extends into the fresh-keeping box body, and the outer side of the rear end of the temperature monitor is provided with a plurality of rubber rings.

[0013] In summary, the present application provides a composite PEF electric field fresh-keeping system for food raw materials, which has the following beneficial effects: 1. The rear end of the temperature monitor in the detection unit passes through the mounting plate and extends into the fresh-keeping box body, and the rubber rings on the outer side of the temperature monitor not only ensure the sealing of the box body but also buffer the vibration, ensuring accurate collection of temperature data; the temperature monitor transmits the real-time temperature to the temperature monitoring and adjusting unit of the control device, when the temperature is higher than the preset upper limit, the temperature monitoring and adjusting unit controls the refrigeration module to start cooling, and when the temperature is lower than the preset lower limit, the heating module is controlled to increase the temperature, so that the temperature in the fresh-keeping box body is always stable in the range of 2-4℃, thereby avoiding the condensation of free water in the raw materials into irregular ice crystals from the source, protecting the integrity of the cell structure of the raw materials, reducing the loss of active proteins, vitamins and other nutrients, preventing the raw materials from being layered after thawing, and ensuring the delicate taste of the final ice cream.

[0014] 2. The high-voltage electrostatic generator in the electrostatic field generating unit is electrically connected with the electrode column through the connecting cable, the electrode column drives the electrode plate attached to the left and right ends of the inner side of the fresh-keeping box body to release the electrostatic field, the insulating sleeve is fixed with the fresh-keeping box body through the fixed side plate, which not only prevents electrostatic leakage but also ensures the stability of the position of the electrode plate; the electrostatic field parameter control unit of the control device receives the real-time data of the electric field sensor, dynamically adjusts the electrostatic field strength and frequency domain output by the high-voltage electrostatic generator, and actively kills stubborn microorganisms such as lactic acid bacteria and mold in the raw materials, rather than just inhibiting their reproduction, effectively reducing the risk of microbial deterioration and toxin production, and improving the safety of the raw materials.

[0015] 3. The gas source is provided by the oxygen cylinder, carbon dioxide cylinder and nitrogen cylinder of the gas storage unit, three first control valves are arranged in the gas adjusting unit to control the gas output of the three gas cylinders, the gas flow meter collects the flow data in real time and feeds back to the gas proportional control unit of the control device when the gas is transmitted through the gas conveying pipe, the one-way electromagnetic valve prevents the backflow of the gas, and the pressure gauge monitors the pressure of the gas cylinder to ensure the stability of the gas source; the gas proportional control unit adjusts the opening degree of the one-way electromagnetic valve according to the feedback, so that the three kinds of gases enter the gas mixer according to the preset proportion and are fully mixed, and then are conveyed to the preservation box through the second control valve, and the gas sensor is used to detect the gas concentration of the box in real time, so as to ensure the stability of the gas environment, avoid the oxidation browning of the raw materials caused by high oxygen, prevent the imbalance of acidity caused by the accumulation of carbon dioxide, and ensure the flavor and processing adaptability of the raw materials. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front side three-dimensional structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 2 It is a back side three-dimensional structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 3 It is a gas adjusting unit structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 4 It is a static electric field generating unit structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 5 It is a preservation box, insulation sleeve and electrode plate structure sectional view schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 6 It is a detection unit structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 7 It is a fixing unit structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 8 It is a transportation unit structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 9 It is a control device structure schematic view of the compound PEF electric field preservation system for food raw materials of the application. Figure 10 It is a flow architecture schematic view of the compound PEF electric field preservation system for food raw materials of the application.

[0017] MARK NUMBER EXPLANATION: 1, preservation box body; 2, airtight box cover; 3, gas mixer; 4, gas adjusting unit; 401, first control valve; 402, second control valve; 403, gas conveying pipe; 404, gas flow meter; 405, one-way electromagnetic valve; 406, pressure gauge; 5, gas storage unit; 501, oxygen cylinder; 502, carbon dioxide cylinder; 503, nitrogen cylinder; 6, electrostatic field generating unit; 601, high-voltage electrostatic generator; 602, connecting cable; 603, insulating sleeve; 604, electrode plate; 605, electrode column; 606, fixed side plate; 7, detection unit; 701, mounting plate; 702, fixed cylinder; 703, temperature monitor; 704, threaded column; 705, first threaded hole; 706, rubber ring; 8, control device; 801, gas proportional control unit; 802, electrostatic field parameter control unit; 803, temperature monitoring and adjusting unit; 804, safety warning control unit; 805, data storage and backtracking unit; 806, gas sensor; 807, electric field sensor; 808, refrigeration module; 809, heating module; 9, transportation unit; 901, transportation plate; 902, limiting sleeve; 903, handle; 904, universal wheel; 10, fixing unit; 1001, rear half sleeve; 1002, front half sleeve; 1003, side lug; 1004, connecting bolt; 1005, locking nut; 1006, connecting plate; 1007, connecting column; 1008, second threaded hole. DETAILED DESCRIPTION

[0018] The following will be described in detail below Figure 1 - the accompanying drawings Figure 10 The present application will be further described in detail.

[0019] Example one: Please refer to Figures 1-10 The present application provides a technical solution: a composite PEF electric field preservation system for food raw materials, comprising a preservation box body 1 and an airtight box cover 2, and the upper end of the airtight box cover 2 is fixedly provided with a gas mixer 3 in the middle, the rear of the preservation box body 1 is provided with a transportation unit 9, the upper part of the transportation unit 9 is provided with a gas storage unit 5, the upper part of the gas mixer 3 is provided with a gas adjusting unit 4, and the gas mixer 3, the gas adjusting unit 4 and the gas storage unit 5 are used to accurately deliver and mix oxygen, carbon dioxide and nitrogen in different proportions into the preservation box body 1, so as to ensure that the gas environment quickly reaches the set value; The outside of the preservation box body 1 is provided with an electrostatic field generating unit 6, which is used to generate a high-voltage electrostatic field to maximize sterilization of the inside of the preservation box body 1 and the food raw materials; The right side of the preservation box body 1 is fixedly provided with a detection unit 7, which is used to monitor the temperature in the preservation box body 1 in real time and maintain the constant temperature condition during storage; The front side of the preservation box body 1 is fixedly provided with a control device 8, which is used for unified automatic management to automatically adjust the gas environment, the static field strength and frequency, and the temperature environment in the preservation box body 1, so as to perform composite preservation on food raw materials; The outer side of the gas storage unit 5 is provided with a fixing unit 10, which is used for fixing the gas storage unit 5 and the transport vehicle body, and preventing the movement of the gas storage unit 5.

[0020] The gas storage unit 5 includes an oxygen cylinder 501, a carbon dioxide cylinder 502 and a nitrogen cylinder 503, which respectively provide oxygen, carbon dioxide and nitrogen gas sources for the gas environment regulation in the preservation box body 1, realize accurate gas proportioning, and provide raw material support for subsequent construction of a gas atmosphere suitable for ice cream raw material storage; The gas regulating unit 4 includes three first control valves 401, second control valves 402 and gas conveying pipes 403. The three first control valves 401 are respectively fixedly provided with output ends of the oxygen cylinder 501, the carbon dioxide cylinder 502 and the nitrogen cylinder 503. The three second control valves 402 are respectively fixedly arranged on the upper part of the gas mixer 3. The three first control valves 401 and the second control valves 402 are respectively connected through the corresponding gas conveying pipes 403. The first control valves 401 are used for controlling the output on-off and initial flow of the gas of each cylinder. The second control valves 402 are used for controlling the on-off of the gas mixed by the gas mixer 3 to the preservation box body 1. The gas conveying pipes 403 realize the transmission of the gas between the cylinders, the gas mixer 3 and the preservation box body 1. The outer side of the gas conveying pipe 403 is provided with a gas flow meter 404 and a one-way electromagnetic valve 405. The outer side of the first control valve 401 is also fixedly provided with a pressure gauge 406. The gas flow meter 404 can collect the conveying flow data of each gas in real time and feed back to the gas proportioning control unit 801 of the control device 8, so as to provide a basis for flow dynamic adjustment. The one-way electromagnetic valve 405 can prevent the backflow of the gas in the conveying process, so as to ensure the one-way nature and stability of the gas transmission. The pressure gauge 406 can monitor the output pressure of each cylinder in real time, so as to ensure that the gas source pressure is in a safe and stable range, and to avoid the influence of abnormal pressure on the gas proportioning accuracy.

[0021] The electrostatic field generating unit 6 includes a high-voltage electrostatic generator 601 fixedly arranged at the rear side of the preservation box body 1 and two electrode plates 604, the upper parts of the two electrode plates 604 are provided with insulating sleeves 603, the insulating sleeves 603 are arranged at the upper left and right sides of the airtight box cover 2, the outer sides of the electrode plates 604 are attached to the inner left and right ends of the preservation box body 1, and the high-voltage electrostatic generator 601 is a core component for generating high-voltage electrostatic field and can output electrostatic energy with a set intensity and frequency; the electrode plates 604 are arranged by being attached to the inner side of the box body, so that the electrostatic field uniformly covers the internal space of the preservation box body 1, and ensures that the raw materials receive the electric field effect in all directions; the insulating sleeves 603 play an insulating protection role on the one hand to prevent electrostatic leakage, and on the other hand can fix the position of the electrode plates 604 to avoid displacement affecting the uniformity of the electric field, and the three cooperate to achieve efficient sterilization of the raw materials in the box body.

[0022] The detection unit 7 includes a mounting plate 701 fixedly connected to the right side of the preservation box body 1, the right end of the mounting plate 701 is provided with a fixed cylinder 702, the inside of the fixed cylinder 702 is embedded with a temperature monitor 703, and the mounting plate 701 provides fixed support for the entire detection unit 7, so that the detection unit is stably connected to the preservation box body 1; the fixed cylinder 702 installs the temperature monitor 703 through the embedded mode, and provides installation positioning for the temperature monitor 703 to prevent the temperature monitor from shaking during transportation or use; The upper and lower ends of the fixed cylinder 702 are provided with threaded columns 704, and the outer upper and lower ends of the temperature monitor 703 are provided with first threaded holes 705, the threaded columns 704 and the first threaded holes 705 are connected through bolts, and the threaded columns 704 are connected with the first threaded holes 705 through bolts, so that the temperature monitor 703 is fixedly arranged in the fixed cylinder 702, further improving the stability of the temperature monitor installation, and ensuring that the temperature monitor can continuously and accurately collect the temperature data in the box body.

[0023] The transportation unit 9 includes a transportation plate 901, three limiting sleeves 902 are equidistantly arranged on the upper part of the transportation plate 901, a handle 903 is arranged at the upper end of the rear side of the transportation plate 901, universal wheels 904 are fixedly arranged at the four corners of the bottom of the transportation plate 901, and the transportation plate 901 provides a placement platform for the gas storage unit 5; the three limiting sleeves 902 are adapted to the oxygen cylinder 501, the carbon dioxide cylinder 502 and the nitrogen cylinder 503 respectively, and can limit the displacement of the gas cylinders on the transportation plate 901; the handle 903 facilitates the operator to push the transportation unit 9, and the universal wheels 904 realize flexible movement of the transportation unit 9, so that the whole is convenient for carrying and position adjustment of the gas storage unit 5, and is suitable for different use scenarios.

[0024] The fixing unit 10 comprises a rear half cover 1001 and a front half cover 1002, the left and right ends of the rear half cover 1001 and the front half cover 1002 are provided with side ears 1003, the middle parts of the side ears 1003 are provided with connecting bolts 1004, the outer sides of the front and rear parts of the connecting bolts 1004 are threadedly connected with lock nuts 1005, the rear half cover 1001 and the front half cover 1002 can be spliced to form a complete annular structure, which is wrapped outside the gas storage unit 5; the side ears 1003 provide mounting positions for the connecting bolts 1004, the rear half cover 1001 and the front half cover 1002 can be fixed by penetrating the side ears 1003 through the connecting bolts 1004 and tightening the lock nuts 1005, thereby realizing the connection between the gas storage unit 5 and the transport vehicle body.

[0025] The rear half cover 1001 and the front half cover 1002 are each three continuous semicircular ring bodies, the left and right ends of the rear part of the rear half cover 1001 are provided with connecting plates 1006 and connecting columns 1007, the left and right ends of the rear part of the rear half cover 1001 and the front side of the connecting plate 1006 are provided with second threaded holes 1008, the front and rear ends of the connecting column 1007 are threadedly connected with the corresponding second threaded holes 1008, the three continuous semicircular ring bodies correspond to the three gas cylinders of the gas storage unit 5 respectively, so as to ensure that the rear half cover 1001 and the front half cover 1002 can accurately wrap each gas cylinder; the connecting plate 1006 and the connecting column 1007 are connected through the second threaded hole 1008, so as to fix the rear half cover 1001 on the transport vehicle body, thereby enhancing the stability of the connection between the fixing unit 10 and the vehicle body and preventing the gas storage unit 5 from moving during transportation.

[0026] The upper ends of the two electrode plates 604 are provided with electrode columns 605, the electrode columns 605 are protrudingly arranged at the middle parts of the upper ends of the corresponding insulating sleeves 603, the left and right sides of the high-voltage electrostatic generator 601 are electrically connected with connecting cables 602, the front ends of the connecting cables 602 are electrically connected with the corresponding electrode columns 605, the electrode column 605 serves as a connecting component of the electrode plate 604 and the connecting cable 602, so as to transmit the electrostatic energy output by the high-voltage electrostatic generator 601 to the electrode plate 604 through the connecting cable 602, thereby providing an electric energy path for the electrode plate 604 to release the electrostatic field; The outer side of the insulating sleeve 603 is provided with fixed side plates 606, the fixed side plates 606 are fixedly connected with the left and right sides of the front and rear ends of the fresh-keeping box body 1 through bolts, the fixed side plates 606 are connected with the box body through the bolts, so as to firmly fix the insulating sleeve 603 and the electrode plate 604 connected therewith on the fresh-keeping box body 1, thereby avoiding the displacement of the electrode plate 604 due to the shaking or transportation of the fresh-keeping box body 1, and ensuring the stability of the electrostatic field coverage range.

[0027] The rear end of the temperature monitor 703 passes through the mounting plate 701 and extends into the fresh-keeping box body 1, and the rear end of the temperature monitor 703 is provided with a plurality of rubber rings 706 outside, the rear end of the temperature monitor 703 extends into the fresh-keeping box body 1 and can directly contact the internal environment of the box body, so as to ensure that the collected temperature data is true and accurate; the rubber ring 706 can fill the gap between the monitor and the mounting plate 701 on the one hand, prevent the leakage of the gas in the fresh-keeping box body 1, and on the other hand, can buffer the vibration received by the temperature monitor 703, and has a protection effect on the temperature monitor 703.

[0028] Please refer to Figures 1-10 A control method of a composite PEF electric field fresh-keeping system of food raw materials is shown in the figure, which specifically comprises the following control steps: The control device 8 is electrically connected with the gas flow meter 404, the one-way electromagnetic valve 405, the pressure gauge 406, the high-voltage electrostatic generator 601 and the temperature monitor 703, and the oxygen, carbon dioxide and nitrogen in the fresh-keeping box body 1 are regulated in different proportions by the control device 8, and the temperature in the fresh-keeping box body 1 is detected, and the electrostatic field strength and frequency are regulated; The control device 8 comprises a gas ratio control unit 801, an electrostatic field parameter control unit 802, a temperature monitoring and adjusting unit 803, a safety warning control unit 804 and a data storage and backtracking unit 805; The control device 8 further comprises a gas sensor 806, an electric field sensor 807, a refrigeration module 808 and a heating module 809; S1, system startup and parameter initialization: start the control device 8, and the control units are synchronously self-checked, the gas ratio control unit 801 detects the switch state of the first control valve 401 and the second control valve 402, the electrostatic field parameter control unit 802 detects the power supply of the high-voltage electrostatic generator 601 and the insulation performance of the insulation sleeve 603, the temperature monitoring and adjusting unit 803 detects the signal transmission of the temperature monitor 703, the safety warning control unit 804 detects the initial pressure value of the pressure gauge 406, and the data storage and backtracking unit 805 detects the running state of the data storage module; After the self-checking is passed, the preset parameters are input through the man-machine interface of the control device 8 according to the characteristics of the ice cream raw materials to be preserved, including target gas ratio, target temperature, electrostatic field strength and frequency, and minimum safety pressure of the gas storage unit 5; The data storage and backtracking unit 805 stores the preset parameters according to the time stamp.

[0029] S2, precise construction of the gas environment of the preservation box body: after receiving the initialization parameters, the gas proportion control unit 801 first reads the real-time pressure of the oxygen cylinder 501, the carbon dioxide cylinder 502 and the nitrogen cylinder 503 through the pressure gauge 406. If the pressure of any cylinder is lower than the preset value, the gas proportion control unit 801 triggers the safety warning control unit 804 to send a low pressure warning, prompting to replace the cylinder. If the pressure is normal, it will enter the next step; The gas proportion control unit 801 controls the opening of the three first control valves 401 and adjusts the initial opening of the one-way electromagnetic valve 405, so that the three gases flow to the gas mixer 3 through the corresponding gas delivery pipe 403. At the same time, the gas flow meter 404 collects the flow data of each gas in real time and feeds back the signal to the gas proportion control unit 801; The gas proportion control unit 801 dynamically adjusts the opening of the one-way electromagnetic valve 405 according to the flow feedback. If the oxygen flow is lower than the preset value, the opening of the corresponding electromagnetic valve of the oxygen cylinder 501 will be increased, otherwise it will be decreased. After the three gases are fully mixed in the gas mixer 3, the gas proportion control unit 801 controls the opening of the second control valve 402 to deliver the mixed gas to the preservation box body 1. When the gas sensor 806 detects that the gas concentration in the preservation box body 1 reaches the preset value, the gas proportion control unit 801 controls the first control valve 401 and the second control valve 402 to switch to the micro-opening maintenance mode, keeping the internal gas environment stable.

[0030] S3, high voltage electrostatic field starting and sterilization regulation: after the gas environment meets the standard, the electrostatic field parameter control unit 802 sends a start signal to the high voltage electrostatic generator 601 to control it to output a high voltage electrostatic field with a preset intensity; The high voltage electrostatic generator 601 transmits electric energy to the electrode column 605 through the connecting cable 602, and then releases a uniform electrostatic field to the inside of the box through the electrode plate 604, killing the microorganisms on the surface and inside of the ice cream raw materials; At the same time, the electric field sensor 807 monitors the actual intensity and frequency of the electrostatic field in real time. If the electric field is not uniform due to the accumulation of raw materials, the output power of the high voltage electrostatic generator 601 will be automatically adjusted to ensure that the electric field covers the entire domain of the box, while avoiding excessive intensity that damages active proteins in the raw materials; After the sterilization process lasts for a preset time, the electrostatic field parameter control unit 802 controls the electrostatic field to switch to a low frequency maintenance mode to inhibit the reproduction of microorganisms.

[0031] S4, real-time temperature monitoring and constant temperature maintenance of the box body; the temperature monitor 703 continuously collects the real-time temperature in the preservation box body 1 and transmits the data to the temperature monitoring and adjusting unit 803; If the temperature is higher than the preset upper limit, the temperature monitoring and adjusting unit 803 controls the built-in refrigeration module 808 of the preservation box 1 to start, reducing the internal temperature of the box, and if the temperature is lower than the preset lower limit, the heating module 809 is controlled to start to avoid the moisture in the raw materials from freezing into ice crystals; When the temperature stabilizes in the 2-4℃ interval, the temperature monitoring and adjusting unit 803 controls the temperature control module to switch to an intermittent operation mode, and only starts to adjust when the temperature fluctuation exceeds ±0.5℃, reducing energy consumption, and at the same time, the temperature monitoring and adjusting unit 803 transmits the temperature fluctuation data in real time to the data storage and backtracking unit 805 for storage.

[0032] S5, whole-process safety warning and abnormality processing: the safety warning control unit 804 receives the operation data of each unit in real time, the gas cylinder pressure of the pressure gauge 406, the flow abnormality of the gas flow meter 404, the ultra-high temperature or ultra-low temperature of the temperature monitor 703, the short-circuit risk of the electrostatic field parameter control unit 802, and the gas leakage feedback of the gas proportion control unit 801; If any parameter exceeds the safety threshold, the safety warning control unit 804 immediately triggers a triple warning; At the same time, the safety warning control unit 804 automatically executes emergency processing, if there is gas leakage, controls the one-way electromagnetic valve 405 to close the electromagnetic valve of the corresponding gas delivery pipe 403, if there is electrostatic field short circuit, controls the high-voltage electrostatic generator 601 to stop urgently, and if there is ultra-high temperature or ultra-low temperature, controls the refrigeration module 808 and the heating module 809 to adjust until the abnormality is resolved; After the abnormality is resolved, the safety warning control unit 804 sends a recovery operation signal to the gas proportion control unit 801, the electrostatic field parameter control unit 802, and the temperature monitoring and adjusting unit 803, and the system resumes stable operation according to the process of S2-S4, and at the same time, the safety warning control unit 804 records the abnormality processing process to the data storage and backtracking unit 805.

[0033] S6, operation data storage and backtracking management: the data storage and backtracking unit 805 receives and stores the operation data of each control unit in real time, the gas proportion change curve of S2, the electrostatic field parameter record of S3, the temperature fluctuation data of S4, and the warning and processing log of S5; The data is stored according to the frequency of the time stamp, supports querying the operation data of any time period through the interface of the control device 8, and is convenient for tracing the preservation process of the ice cream raw materials; When the system completes a preservation task, the data storage and backtracking unit 805 automatically generates a preservation process report.

[0034] S7: System shutdown or cycle operation control: If a shutdown instruction is received before the raw material is taken out, the gas proportion control unit 801 first controls all gas valves to be closed, the residual gas in the gas delivery pipe 403 to be exhausted, the electrostatic field parameter control unit 802 controls the high-voltage electrostatic generator 601 to be shut down, the residual charge of the electrode plate 604 to be released, and the temperature monitoring and adjusting unit 803 controls the temperature control module to be shut down; After all the components are shut down, the data storage and backtracking unit 805 backs up the fresh-keeping data of this time, and then the system enters a standby state. If no shutdown instruction is received, the gas proportion control unit 801 and the data storage and backtracking unit 805 cooperatively control the system to cyclically execute the processes of S2, S3, S4, S5 and S6 until the fresh-keeping task is completed.

[0035] The embodiments of the specific implementation are the preferred embodiments of the present application, but do not limit the protection scope of the present application, wherein the same parts are denoted by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A composite PEF electric field preservation system for food raw materials, comprising a preservation box (1) and a sealed box lid (2), characterized in that: A gas mixer (3) is fixedly installed in the middle of the upper end of the sealed box cover (2). A transport unit (9) is installed at the rear of the preservation box (1). A gas storage unit (5) is installed on the upper part of the transport unit (9). A gas regulating unit (4) is installed on the upper part of the gas mixer (3). The gas mixer (3), the gas regulating unit (4) and the gas storage unit (5) are used to accurately transport and mix oxygen, carbon dioxide and nitrogen in different proportions into the preservation box (1) to ensure that the gas environment quickly reaches the set value. An electrostatic field generating unit (6) is provided on the outside of the preservation box (1). The electrostatic field generating unit (6) is used to generate a high voltage electrostatic field to maximize the sterilization of the inside of the preservation box (1) and food raw materials. A detection unit (7) is fixedly installed on the right side of the preservation box (1). The detection unit (7) is used to monitor the temperature inside the preservation box (1) in real time and maintain constant temperature conditions during the storage process. A control device (8) is fixedly installed on the front side of the preservation box (1). The control device (8) is used for unified automated management to automatically adjust the gas environment, electrostatic field strength and frequency, and temperature environment inside the preservation box (1), thereby performing compound preservation of food raw materials. A fixing unit (10) is provided on the outside of the gas storage unit (5). The fixing unit (10) is used to fix the gas storage unit (5) to the transport vehicle body to prevent the gas storage unit (5) from moving.

2. The composite PEF electric field preservation system for food raw materials according to claim 1, characterized in that: The gas storage unit (5) includes an oxygen cylinder (501), a carbon dioxide cylinder (502), and a nitrogen cylinder (503). The gas regulating unit (4) includes three first control valves (401), two control valves (402), and a gas delivery pipe (403). The three first control valves (401) are respectively fixedly provided with the output ends of oxygen cylinder (501), carbon dioxide cylinder (502), and nitrogen cylinder (503). The three second control valves (402) are respectively fixedly provided on the upper part of the gas mixer (3). The three first control valves (401) and second control valves (402) are respectively connected through the corresponding gas delivery pipes (403). Gas flow meters (404) and one-way solenoid valves (405) are provided on the outside of the gas delivery pipe (403), and a pressure gauge (406) is also fixedly provided on the outside of the first control valve (401).

3. The composite PEF electric field preservation system for food raw materials according to claim 1, characterized in that: The electrostatic field generating unit (6) includes a high-voltage electrostatic generator (601) and two electrode plates (604). The high-voltage electrostatic generator (601) is fixedly installed on the rear side of the preservation box (1). The upper part of the two electrode plates (604) is provided with an insulating sleeve (603). The insulating sleeve (603) is installed on the upper left and right sides of the sealed box cover (2). The outer side of the electrode plate (604) is attached to the inner left and right ends of the preservation box (1).

4. The composite PEF electric field preservation system for food raw materials according to claim 1, characterized in that: The detection unit (7) includes a mounting plate (701), which is fixedly connected to the right side of the preservation box (1). A fixing cylinder (702) is provided at the right end of the mounting plate (701), and a temperature monitoring instrument (703) is fitted inside the fixing cylinder (702). The upper and lower ends of the fixed cylinder (702) are provided with threaded posts (704), and the upper and lower ends of the outer side of the temperature monitor (703) are provided with first threaded holes (705). The threaded posts (704) and the first threaded holes (705) are connected by bolts.

5. The composite PEF electric field preservation system for food raw materials according to claim 1, characterized in that: The transport unit (9) includes a transport plate (901), three limiting sleeves (902) are equidistantly arranged on the upper part of the transport plate (901), a handle (903) is provided on the rear side of the upper end of the transport plate (901), and universal wheels (904) are fixedly arranged at the four corners of the bottom of the transport plate (901).

6. The composite PEF electric field preservation system for food raw materials according to claim 1, characterized in that: The fixing unit (10) includes a rear half (1001) and a front half (1002). The left and right ends of the rear half (1001) and the front half (1002) are provided with side ears (1003). The middle part of the side ears (1003) is provided with a connecting bolt (1004). The front and rear parts of the outer side of the connecting bolt (1004) are threaded with locking nuts (1005).

7. The composite PEF electric field preservation system for food raw materials according to claim 6, characterized in that: The rear half (1001) and the front half (1002) are both three continuously arranged semi-circular rings. The rear left and right ends of the rear half (1001) are provided with connecting plates (1006) and connecting posts (1007). The rear left and right ends of the rear half (1001) and the front side of the connecting plate (1006) are provided with second threaded holes (1008). The front and rear ends of the connecting post (1007) are threadedly connected to the corresponding second threaded holes (1008).

8. The composite PEF electric field preservation system for food raw materials according to claim 3, characterized in that: Both of the electrode plates (604) are provided with electrode posts (605) at their upper ends. The electrode posts (605) are all protruding from the middle of the upper end of the corresponding insulating sleeve (603). The left and right sides of the high voltage electrostatic generator (601) are electrically connected with connecting cables (602). The front end of the connecting cables (602) is electrically connected to the corresponding electrode posts (605). The outer side of the insulating sleeve (603) is provided with a fixed side plate (606) at both the front and rear. The fixed side plate (606) is fixedly connected to the left and right front and rear ends of the food storage box (1) by bolts.

9. The composite PEF electric field preservation system for food raw materials according to claim 4, characterized in that: The rear end of the temperature monitor (703) passes through the mounting plate (701) and extends into the food storage box (1). Several rubber rings (706) are provided on the outer side of the rear end of the temperature monitor (703).

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