Cold plasma fruit and vegetable fresh-keeping and sterilizing system

Abstract

The invention discloses a cold plasma fruit and vegetable fresh-keeping and sterilizing system, and relates to the technical field of food fresh-keeping. The conveying belt passes through the lower portion of the cold plasma rotational flow cleaner and then penetrates through the cold plasma slicing chamber, induction lifting doors are installed at a feeding port and a discharging port of the cold plasma slicing chamber, a cold plasma slicing cutter set is installed at the inner top of the cold plasma slicing chamber, and a gas tank set supplies gas to the cold plasma slicing chamber after passing through a mixing chamber. A shell of the cold plasma cyclone cleaner comprises an upper cylindrical section and a lower conical section, a cover plate covers the top, a cold plasma activated water generator is mounted on the inner wall, a discharge port with an on-off valve is formed in the bottom end, the bottom end of the lower conical section is laterally communicated with a circulating pump through a water return pipe, and the circulating pump is tangentially communicated with the upper cylindrical section through a water inlet pipe section. After fruits and vegetables are cleaned through the cold plasma rotational flow cleaner, the fruits and vegetables are conveyed to the cold plasma slicing chamber through the conveying belt to be sliced, cold plasmas directly act on sections of the fruits and vegetables during slicing, and the fresh-keeping and sterilizing effects are good.

Description

Technical Field

[0001] The invention relates to the technical field of food preservation, in particular to a cold plasma fruit and vegetable preservation and sterilization system. Background Art

[0002] Fruits and vegetables are important sources of vitamins and cellulose in people's daily diet. The harvesting, transportation, storage and other links will lead to serious loss of fruits and vegetables. The most critical problem of fruit and vegetable loss is deterioration. As time goes by, the nutrients in fruits and vegetables will gradually be lost, and maintaining the freshness and stability of fruits and vegetables has always been a pain point in the industry. Therefore, it is particularly important to extend the shelf life of fruits and vegetables and maintain the freshness of fruits and vegetables to reduce losses.

[0003] At present, cold plasma treatment has been proven to have great potential in food preservation and sterilization technology, and has become a modern trend in fruit and vegetable preservation and sterilization.

[0004] Cold plasma has the advantages of short time consumption, high work efficiency, safety, non-toxicity, and simple and easy operation, while cold plasma activated water has good antibacterial activity against a variety of microorganisms. After soaking and rinsing with cold plasma activated water, microorganisms on the surface of fruits and vegetables can be effectively killed, maintaining the hardness of fruits and vegetables, delaying spoilage, and causing less negative impact on physical and chemical quality. However, due to the limited penetration ability of cold plasma into food and the small discharge gap, the popularity of cold plasma treatment in the fruit and vegetable industry is relatively low. In order to solve this problem, there is an urgent need for a fruit and vegetable preservation and sterilization system based on cold plasma treatment, which directly acts on the cut surface of fruits and vegetables by slicing to prevent the cut surface of fruits and vegetables from oxidizing and deteriorating in contact with air, thereby ensuring the processing quality of fruits and vegetables. Summary of the invention

[0005] In order to solve the shortcomings of the background technology, the present invention provides a cold plasma fruit and vegetable preservation and sterilization system, which cleans the fruits and vegetables through a cold plasma cyclone cleaner and then sends them to a cold plasma slicing chamber by a conveyor belt for slicing. During slicing, the cold plasma directly acts on the cut surface of the fruits and vegetables, which has a better preservation and sterilization effect and helps to maintain the quality of the fruits and vegetables for a long time.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a cold plasma fruit and vegetable preservation and sterilization system, comprising a cold plasma slicing chamber, a cold plasma cyclone cleaner, a conveyor belt and a gas tank group, the conveyor belt passes through the cold plasma slicing chamber after passing under the cold plasma cyclone cleaner, the cold plasma slicing chamber comprises a slicing box and a cold plasma slicing knife group, the front and rear side walls of the slicing box are respectively provided with a feed inlet and a discharge inlet for the conveyor belt to pass through, the feed inlet and the discharge inlet are respectively provided with induction lifting doors, the cold plasma slicing knife group is installed on the top of the slicing box and is driven and controlled by an up and down reciprocating displacement mechanism, the cold plasma slicing knife group is composed of a plurality of slicing knives arranged in parallel and in pairs along the front and rear directions. The slicing knife comprises a cold plasma emitting device and a blade installed at the bottom thereof, an air outlet and an air inlet are respectively arranged at the top and the bottom of the slicing box, the gas tank group is connected to the mixing chamber through a pipeline, and the air is supplied to the slicing box through the air inlet, the cold plasma cyclone cleaning device comprises a circulation pump, a shell, a water inlet pipe section and a cover plate, the shell comprises an upper cylindrical section and a lower conical section, the cover plate is installed on the top of the upper cylindrical section, a cold plasma activated water generator is installed on the inner wall of the lower conical section, the bottom end of the lower conical section is arranged as a discharge port with an on-off valve, the water inlet end of the circulation pump is laterally connected with the bottom end of the lower conical section through a return pipe, the lower end of the water inlet pipe section is connected with the water outlet end of the circulation pump, and the upper end of the water inlet pipe section is tangentially connected with the upper cylindrical section.

[0007] Furthermore, a monitoring device is integrated on the slice box, and the monitoring device displays the internal image of the slice box in real time through a monitor, and monitors the discharge parameters of the cold plasma through the arrangement of sensors.

[0008] Furthermore, a three-way water distribution pipe is provided on the return water pipe of the cold plasma cyclone cleaner, and the three-way water distribution pipe is provided with a solenoid valve and connected to the waste liquid tank.

[0009] Furthermore, a heating jacket is provided on the outside of the return pipe of the cold plasma cyclone cleaner.

[0010] Furthermore, the bottom of the discharge port of the shell with an on-off valve is connected to a wind tube, and the wind tube is connected to an external air drying device.

[0011] Furthermore, the conveyor belt adopts a servo-controlled chain plate conveyor belt, and the center position of each chain plate unit is processed with a groove for burying the blade. When the conveyor belt stops moving, all the blades of the cold plasma slicing knife group are arranged vertically opposite to the grooves of the corresponding chain plate units.

[0012] Furthermore, the cold plasma emission device adopts a dielectric barrier discharge reactor and is powered by an AC high-voltage power supply with a voltage range of 5.5-80kV. The dielectric barrier discharge reactor includes three parts: a ground electrode, a dielectric and a flat electrode. The dielectric is clamped and fixed on both sides of the flat electrode. The blade is fixedly installed at the bottom of the dielectric and is spaced from the flat electrode. The two poles of the AC high-voltage power supply are respectively connected to the flat electrodes in two slicing knives arranged in pairs through wires and are simultaneously connected to the ground electrode. The waveforms generated by two adjacent AC high-voltage power supplies in the cold plasma slicing knife group are alternately transformed.

[0013] Furthermore, the dielectric is fixed on both sides of the flat electrode by two glass plates.

[0014] Furthermore, sealing strips are bonded to the bottom and both sides of the induction lifting door.

[0015] Furthermore, the up and down reciprocating displacement mechanism uses a driving motor as a power source, and controls the up and down reciprocating movement of the slicing knife of the cold plasma slicing knife group through a Scotch yoke connecting rod mechanism.

[0016] Compared with the prior art, the invention has the following beneficial effects: the overall structure of the invention is simple and reasonable, and the invention is easy to use; the fruits and vegetables are cleaned by a cold plasma cyclone cleaner; a cold plasma activated water generator is arranged inside the cold plasma cyclone cleaner to generate plasma activated water for cyclone cleaning of the fruits and vegetables; the cleaned fruits and vegetables are then sent to a cold plasma slicing chamber for slicing by a conveyor belt; the slicing knife is provided with a cold plasma emission device, and the cold plasma can be directly applied to the cut surface of the fruits and vegetables during slicing; the preservation and sterilization effect is better, and the invention is helpful to maintain the quality of the fruits and vegetables for a long time, prolong the shelf life of the fresh fruits and vegetables, and reduce the loss rate of the fresh fruits and vegetables during the selling and transportation process; the cleaning, slicing and preservation and sterilization are completed at one time; and the processed fruit and vegetable pieces have the advantages of no washing, no cutting, long storage time, and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall framework of the system of the present invention;

[0018] Figure 2 Schematic diagram of the structure of the cold plasma slicing chamber in the system of the present invention;

[0019] Figure 3 Schematic diagram of the structure of the cold plasma slicing knife group in the system of the present invention;

[0020] Figure 4 This is a driving principle diagram of the cold plasma slicing knife group in the system of the present invention;

[0021] Figure 5It is a schematic diagram of the structure of the cold plasma cyclone cleaner in the system of the present invention.

[0022] In the figure: 1-slicing box, 2-air outlet, 3-cold plasma slicing knife group, 4-monitoring device, 5-power box, 6-feeding port, 7-induction lifting door, 8-discharging port, 9-conveyor belt, 10-air inlet, 11-AC high voltage power supply, 12-ground electrode, 13-dielectric, 14-blade, 15-plate electrode, 16-Scotch yoke connecting rod mechanism, 17-circulating pump, 18-heating jacket, 19-housing, 20-air cylinder, 21-three-way water distribution pipe, 22-water inlet pipe section, 23-cover plate. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, a cold plasma fruit and vegetable preservation and sterilization system comprises a cold plasma slicing chamber, a cold plasma cyclone cleaner, a conveyor belt 9 and a gas tank group. The conveyor belt 9 passes through the cold plasma slicing chamber after passing under the cold plasma cyclone cleaner, and transports the fruits and vegetables cleaned by the cold plasma cyclone cleaner to the inside of the cold plasma slicing chamber.

[0025] Combination Figure 2 As shown, the cold plasma slicing chamber includes a slicing box 1 and a cold plasma slicing knife group 3. The front and rear side walls of the slicing box 1 are respectively provided with a feed port 6 and a discharge port 8 for the conveyor belt 9 to pass through, which are used for the entry of washed fruits and vegetables and the delivery of sliced ​​fruits and vegetables. The feed port 6 and the discharge port 8 are respectively installed with an induction lifting door 7, which completes the induction lifting task only during the entry and delivery of fruits and vegetables, and realizes the closure of the feed port 6 and the discharge port 8 during the slicing of fruits and vegetables inside the slicing box 1. In order to further ensure the airtightness and avoid excessive air leakage when the gas cylinder group supplies gas, sealing strips can be glued and set at the bottom and both sides of the induction lifting door 7, so as to seal the gap between the induction lifting door 7 and the feed port 6 and the discharge port 8. The cold plasma slicing knife group 3 is installed at the top of the slicing box 1 and is driven and controlled by an up and down reciprocating displacement mechanism. The cold plasma slicing knife group 3 is composed of a plurality of slicing knives arranged in parallel and arranged in pairs along the front and back directions, so as to realize the slicing operation of the fruits and vegetables transported to the slicing box 1 by the conveyor belt 9.

[0026] Combination Figure 3As shown, the slicing knife includes a cold plasma emission device and a blade 14. The cold plasma emission device adopts a dielectric barrier discharge reactor and is powered by an AC high voltage power supply 11 with a voltage value range of 5.5-80kV. The dielectric barrier discharge reactor includes three parts: a ground electrode 12, a dielectric 13 and a flat electrode 15. The dielectric 13 is clamped and fixed on both sides of the flat electrode 15. Two glass plates can be used as the dielectric 13. The blade 14 is fixedly installed at the bottom of the dielectric 13 and is spaced from the flat electrode 15. The blade 14 can be inserted in a groove processed at the bottom of the dielectric 13 to facilitate the replacement of the blade 14 according to the situation. The two poles of the AC high voltage power supply 11 are respectively connected to the flat electrodes 15 in the two slicing knives arranged in pairs through wires and are also connected to the ground electrode 12. The waveforms generated by the two adjacent AC high voltage power supplies 11 in the cold plasma slicing knife group 3 are alternately transformed, so that a potential difference is formed between the flat electrodes 15 in the two slicing knives arranged in pairs, and a micro-current is generated to treat the cut surfaces on both sides of fruits and vegetables.

[0027] Combination Figure 4 As shown, the mechanism for driving and controlling the up and down reciprocating displacement of the cold plasma slicing knife group 3 can adopt a Scotch yoke connecting rod mechanism 16. Specifically, a driving motor is used as a power source, and the output shaft of the driving motor is connected to a shaft rod, on which a plurality of discs are coaxially fixed and arranged one by one with the slicing knives, an eccentric shaft is arranged at the edge of the disc, a T-type connecting rod is fixed at the upper end of the slicing knife, a lateral arm of the T-type connecting rod is processed with a slide groove, and the eccentric shaft is inserted in the slide groove, and the inner wall of the slicing box 1 is provided with a vertical slideway for limiting the two sides of the slicing knife, so that when the driving motor controls the rotation of the shaft rod, the disc rotates accordingly and drives the slicing knife to reciprocate up and down between the corresponding vertical slideways through the eccentric shaft and the T-type connecting rod, so as to realize the slicing operation of fruits and vegetables.

[0028] Combination Figure 1-2 As shown, an air outlet 2 and an air inlet 10 are respectively provided at the top and bottom of the slicing box 1, and the air tank group is connected to the mixing chamber through a pipeline, and then the air inlet 10 supplies air to the slicing box 1. The air tank group is composed of a plurality of air tanks according to demand, and each air tank is equipped with an opening regulating valve. All the air tanks are respectively connected to the air inlet end of the mixing chamber through pipelines. Different gases are contained in the air tanks according to demand. The required gases are mixed in proportion inside the mixing chamber according to demand by adjusting the opening regulating valve. The air outlet end of the mixing chamber is connected to the air inlet 10 through a pipeline, and the mixed gas is supplied to the slicing box 1.

[0029] In addition, a monitoring device 4 can be integrated on the slicing box 1 to monitor the entire cold plasma treatment process. The monitoring device 4 displays the internal image of the slicing box 1 in real time through a monitor, and monitors the discharge parameters of the cold plasma through the arrangement of sensors. The discharge parameters include current, charge, discharge voltage, etc. If there is any abnormality, the operator can be warned by a buzzer sounded by the matching automatic alarm.

[0030] In addition, in order to avoid the disadvantage that the cut surface of fruits and vegetables cannot completely contact the cold plasma emission device due to the presence of the blade 14 after the blade 14 contacts the surface of the conveyor belt 9 during the slicing process, which leads to the disadvantage that the cold plasma effect is not comprehensive, it is advisable to use a servo-controlled chain plate conveyor belt for the conveyor belt 9, and the center position of each chain plate unit is processed with a groove for burying the blade 14. During the period when the conveyor belt 9 stops moving, all the blades 14 of the cold plasma slicing knife group 3 are arranged vertically opposite to the grooves of the corresponding chain plate units. Through such a design, the blade 14 can be buried in the corresponding groove during the falling process of the slicing knife, so that the cut surface of fruits and vegetables can be completely in contact with the dielectric 13.

[0031] Combination Figure 5 As shown, the cold plasma cyclone cleaning device includes a circulation pump 17, a housing 19, a water inlet pipe section 22 and a cover plate 23. The housing 19 includes an upper cylindrical section and a lower conical section, and the cover plate 23 is installed on the top of the upper cylindrical section. A cold plasma activated water generator is installed on the inner wall of the lower conical section, which is used to ionize and activate the liquid in the housing 19 to generate plasma activated water. The bottom end of the lower conical section is set as a discharge port with an on-off valve. The water inlet end of the circulation pump 17 is connected to the bottom end of the lower conical section laterally through a return pipe. Since different fruits and vegetables have different temperature requirements for the cleaning liquid, a heating jacket 18 can be attached to the outside of the return pipe to control the temperature of the cleaning liquid. The lower end of the water inlet pipe section 22 is connected to the water outlet end of the circulation pump 17, and the upper end of the water inlet pipe section 22 is connected to the upper cylindrical section along the tangential direction. When the fruits and vegetables are washed and discharged from the bottom end of the lower cone section, they can be dried. For example, a wind tube 20 is connected to the bottom of the discharge port with an on-off valve of the outer shell 19, and the wind tube 20 is connected to an external air drying device for air supply, so that the falling fruits and vegetables are dried by the air flow.

[0032] In addition, a three-way water distribution pipe 21 can be set in the return pipe of the cold plasma cyclone cleaner. The three-way water distribution pipe 21 is provided with a solenoid valve and connected to the waste liquid tank. After the cold plasma cyclone cleaner finishes cleaning the fruits and vegetables, the waste liquid is discharged to the waste liquid tank for storage by opening the solenoid valve of the three-way water distribution pipe 21.

[0033] In order to improve the degree of automation of the present application, a power supply box 5 can be configured for the entire system to supply power to the electrical components of the monitoring device 4, the conveyor belt 9, the cold plasma slicing chamber and the cold plasma cyclone cleaner.

[0034] In this application, the gas in the gas tank of the gas tank group can be selected from air, argon, helium, oxygen, nitrogen, etc. according to demand, and the composition ratio of different gases can be adjusted according to actual needs through the opening regulating valve. Different gas sources will affect the discharge characteristics, emission spectrum and chemical characteristics of the plasma, thereby producing different types and concentrations of active substances, which in turn determine the effects of food sterilization, preservation, pesticide and toxin degradation, and affect the shelf life of fruits and vegetables.

[0035] The principle of the cold plasma emission device is that under the action of a high-voltage electric field, the gas near the electrode will be ionized and produce electrons. The electrons obtain energy from the electric field and transfer energy by colliding with the surrounding molecular atoms, causing them to be excited and ionized, resulting in an electron avalanche. Since the dielectric barrier effect limits the unlimited growth of the discharge current, the gas is not completely broken down to form sparks or arcs, but forms current filaments that are randomly distributed in space and time. The ionization of the gas in the discharge gap can produce a variety of active substances, such as active oxygen, active nitrogen, ultraviolet photons and charged particles.

[0036] When in use, fruits and vegetables to be treated and liquid (such as deionized water, phosphate buffer solution, 0.9% sodium chloride solution, etc.) are placed in the shell 19 of the cold plasma cyclone cleaning device from the cover plate 23, and the activation time is set according to different needs. The cold plasma activated water generator inside starts to run. After the activation time, the circulating pump 17 starts to work, so that the liquid is sucked from the bottom of the shell 19 to the top and sprayed from the water inlet pipe section 22. Under the action of centrifugal force, the activated water inside the shell 19 produces a centrifugal phenomenon to produce a cyclone, thereby achieving the purpose of cleaning the surface of fruits and vegetables. After the cleaning is completed, the circulating pump 17 stops working, and the waste liquid is discharged to the waste liquid tank for storage by opening the electromagnetic valve of the three-way water distribution pipe 21, and the on-off valve of the discharge port at the bottom of the shell 19 is opened. The fruits and vegetables are dried in the air duct 20 during the falling process, and then fall on the conveyor belt 9 and are sent to the inside of the cold plasma slicing room.

[0037] When the fruits and vegetables enter the cold plasma slicing chamber through the conveyor belt 9 and are located below the cold plasma slicing knife group 3, the conveyor belt 9 stops running, the induction lifting doors 7 of the feed port 6 and the discharge port 8 are closed, and the gas mixed in the mixing chamber by the gas tank group is sent into the cold plasma slicing chamber from the gas inlet 10 according to demand. After the gas is full, the up and down reset movement mechanism is started to control the cold plasma slicing knife group 3 to move downward to slice the fruits and vegetables. During this period, the cut surface of the fruits and vegetables contacts the cold plasma emission device, and the cold plasma generated by the cold plasma emission device processes the cut surface of the fruits and vegetables. After the treatment is completed, the cold plasma slicing knife group 3 moves up, and the conveyor belt 9 continues to run to send out the processed fruit and vegetable cut pieces.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms of assembly without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cold plasma fruit and vegetable preservation and sterilization system, Features: The invention comprises a cold plasma slicing chamber, a cold plasma cyclone cleaner, a conveyor belt (9) and a gas cylinder group. The conveyor belt (9) passes through the cold plasma slicing chamber after passing through the bottom of the cold plasma cyclone cleaner. The cold plasma slicing chamber comprises a slicing box (1) and a cold plasma slicing knife group (3). The front and rear side walls of the slicing box (1) are respectively provided with a feed inlet (6) and a discharge outlet (8) for the conveyor belt (9) to pass through. The feed inlet (6) and the discharge outlet (8) are respectively provided with an induction lifting door (7). The cold plasma slicing knife group (3) is installed at the top of the slicing box (1) and is driven and controlled by an up and down reciprocating displacement mechanism. The cold plasma slicing knife group (3) is composed of a plurality of slicing knives arranged in parallel in the front and rear directions and arranged in pairs. The slicing knife comprises a cold plasma emitting device and a cold plasma emitting device installed at the bottom thereof. The slicing box (1) has a cutting blade (14), an air outlet (2) and an air inlet (10) are respectively provided at the top and bottom of the slicing box (1), the gas tank group is connected to the mixing chamber through a pipeline, and then the air is supplied to the slicing box (1) through the air inlet (10), the cold plasma cyclone cleaning device comprises a circulation pump (17), a housing (19), a water inlet pipe section (22) and a cover plate (23), the housing (19) comprises an upper cylindrical section and a lower conical section, the cover plate (23) is covered on the top of the upper cylindrical section, a cold plasma activated water generator is installed on the inner wall of the lower conical section, the bottom end of the lower conical section is arranged as a discharge port with an on-off valve, the water inlet end of the circulation pump (17) is laterally connected to the bottom end of the lower conical section through a return pipe, the lower end of the water inlet pipe section (22) is connected to the water outlet end of the circulation pump (17), and the upper end of the water inlet pipe section (22) is tangentially connected to the upper cylindrical section.

2. A cold plasma fruit and vegetable preservation and sterilization system according to claim 1, Features: The slicing box (1) is integrated with a monitoring device (4), which displays the internal image of the slicing box (1) in real time through a monitor and monitors the discharge parameters of the cold plasma through the arrangement of sensors.

3. A cold plasma fruit and vegetable preservation and sterilization system according to claim 1 or 2, Features: The return water pipe of the cold plasma cyclone cleaner is provided with a three-way water distribution pipe (21), and the three-way water distribution pipe (21) is provided with a solenoid valve and connected to a waste liquid tank.

4. A cold plasma fruit and vegetable preservation and sterilization system according to claim 1, Features: A heating jacket (18) is wrapped around the outside of the return pipe of the cold plasma cyclone cleaner.

5. A cold plasma fruit and vegetable preservation and sterilization system according to claim 1, Features: The bottom of the discharge port with the on-off valve of the shell (19) is connected to a wind tube (20), and the wind tube (20) is connected to an external air drying device.

6. A cold plasma fruit and vegetable preservation and sterilization system according to claim 1, Features: The conveyor belt (9) is a servo-controlled chain plate type conveyor belt, and a groove for embedding a blade (14) is processed at the center position of each chain plate unit, and all blades (14) of the cold plasma slicing knife group (3) are arranged vertically opposite to the grooves of the corresponding chain plate units when the conveyor belt (9) stops moving.

7. A cold plasma fruit and vegetable preservation and sterilization system according to claim 1, Features: The cold plasma emission device adopts a dielectric barrier discharge reactor and is powered by an AC high voltage power supply (11) with a voltage value ranging from 5.5 to 80 kV. The dielectric barrier discharge reactor comprises three parts: a ground electrode (12), a dielectric (13) and a flat electrode (15). The dielectric (13) is clamped and fixed on both sides of the flat electrode (15). The blade (14) is fixedly installed at the bottom of the dielectric (13) and is spaced from the flat electrode (15). The two poles of the AC high voltage power supply (11) are respectively connected to the flat electrodes (15) in two slicing knives arranged in pairs through wires and are simultaneously connected to the ground electrode (12). The waveforms generated by two adjacent AC high voltage power supplies (11) in the cold plasma slicing knife group (3) are alternately transformed.

8. A cold plasma fruit and vegetable preservation and sterilization system according to claim 7, Features: The dielectric (13) is fixed on both sides of the flat electrode (15) by clamping two glass plates.

9. The cold plasma fruit and vegetable preservation and sterilization system according to claim 1, Features: Sealing strips are bonded and arranged at the bottom and both sides of the induction lifting door (7).

10. The cold plasma fruit and vegetable preservation and sterilization system according to claim 1, Features: The up and down reciprocating displacement mechanism uses a driving motor as a power source and controls the up and down reciprocating movement of the slicing knife of the cold plasma slicing knife group (3) through a Scotch yoke connecting rod mechanism (16).

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