Dry fog sterilization device for blueberry fresh-keeping pretreatment

Abstract

The utility model discloses a dry fog sterilization device for blueberry fresh-keeping pretreatment. The dry fog sterilization device is used for solving the technical problem that blueberry fresh-keeping treatment is difficult. The equipment comprises an equipment rack and a conveying belt, a primary sterilization chamber, a pneumatic overturning chamber, a secondary sterilization chamber and a cold air drying chamber are sequentially arranged above a blueberry bearing surface of the conveying belt from the near conveying end to the far conveying end, a branch air pipe and an air nozzle are installed in the pneumatic overturning chamber, and the air nozzle faces the far conveying end and is obliquely arranged; the branch air pipes control the air nozzles to perform pulse type or continuous air injection; venturi nozzles are respectively arranged at the tops of the primary sterilization chamber and the secondary sterilization chamber, and the cold air drying chamber comprises an air cooler and an air curtain pipe. All-directional spraying is conducted on the whole surfaces of blueberries, surface sterilization of the blueberries is achieved, overturning of the blueberries is achieved in the mode that pneumatic overturning is flexibly matched with the Teflon grid conveying belt, and secondary mechanical damage to the blueberries in the overturning and conveying process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of dry mist sterilization equipment for blueberry fresh-keeping pretreatment. Background Art

[0002] Blueberries mature in hot and rainy seasons. Due to their special physiological structure, blueberries are easily scratched and infected by microorganisms during picking, storage and transportation. They are not resistant to storage and will rot and deteriorate after being left at room temperature (around 25°C) for 3-4 days. They are also easily squeezed and collided during transportation, causing a lot of mechanical damage. In view of the market characteristics of the blueberry industry, the storage and preservation of fresh fruits has become a top priority.

[0003] In recent years, domestic and foreign scholars have conducted a lot of research on blueberry preservation, and their research areas mainly include:

[0004] (1) Chemical preservation

[0005] Chemical preservation is the most widely used preservation method in the market. Chemical synthetic preservatives are widely used for their quick effect, good effect and low cost. Organic acids (such as tartaric acid, citric acid and lactic acid) are used as a highly effective antibacterial agent, which can destroy the permeability and transport function of cell membranes and reduce the pH value inside cells to inhibit the growth and reproduction of microorganisms.

[0006] (2) Controlled atmosphere preservation

[0007] Controlled atmosphere preservation is the most common physical preservation technology. It maintains the quality of the fruit by changing the gas composition in the storage environment, inhibiting the respiration rate of the fruit and changing the permeability of the cell membrane. The effect of controlled atmosphere in the storage and transportation microenvironment on the quality of blueberries during cold storage (0°C) can maintain a higher rate of good fruit, VC, titratable acid content and fruit hardness, has a significant inhibitory effect on respiration intensity and ethylene release, and can maintain the balance of active oxygen in the fruit to a certain extent.

[0008] (3) Physical preservation

[0009] When blueberries were irradiated with ultraviolet light (400Gy-590Gy) and then stored for 3 weeks, their sensory quality was scored. It was found that blueberries irradiated with ultraviolet light had better sensory quality, and the scores of those irradiated with high intensity were higher than those of the control.

[0010] Cold plasma refers to an ionized gas containing a variety of active particles (free radicals, ions, electrons, excited atoms and molecules) produced by various plasma sources at low temperature (or slightly higher than room temperature) and normal pressure. It has many advantages, such as being environmentally friendly, low cost, less time consumption and simple operation.

[0011] Physical processing technologies such as ozone and ultrasound are also widely used in the field of fruit and vegetable preservation.

[0012] (4) Biological preservation

[0013] Biological preservation uses natural or artificially controlled microbial flora and the antimicrobial substances they produce to extend the shelf life of food and improve food safety. That is, it uses natural or artificially controlled microbial flora and (or) the antimicrobial substances they produce to extend the shelf life of food and improve food safety.

[0014] According to the data from the Prospective Industry Research, chemical preservation is the most widely used preservation method in the market. Chemical synthetic preservatives are widely used for their quick effect, good effect and low cost. For example, slightly acidic electrolyzed water is used for sterilization and preservation of fruits and vegetables. Slightly acidic electrolyzed water can effectively inhibit and kill pathogenic microorganisms on the surface of fresh-cut fruits and vegetables. Treating fruits and vegetables with acidic electrolyzed water can reduce the number of microorganisms on the surface of fruits and vegetables, keep the nutrient content basically unchanged, inhibit the accumulation of nitrite, and improve the edible quality and safety.

[0015] Among them, the application of hypochlorous acid water preservative to the preservation of blueberries after harvest, Huang Liping and others found that slightly acidic electrolyzed water treatment can effectively inhibit the respiration of blueberries, kill microorganisms on the surface of the fruit, delay the decline of fruit hardness, soluble solids content and anthocyanin content during storage, reduce the generation of malondialdehyde, and prevent blueberries from rotting and quality indicators from declining. Slightly acidic electrolyzed water has a good sterilization effect on fruits and vegetables. At the same time, it overcomes the environmental unfriendliness of traditional chemical sterilization methods, is easy to prepare, and has low cost; while sterilizing, it can also improve the storage quality of fruits and vegetables, and has great development value in the field of fruit and vegetable preservation.

[0016] In the prior art, there is a lack of special equipment for rapid pretreatment of freshly picked blueberries, which needs to perform comprehensive functions such as spray sterilization, precooling and drying. Utility Model Content

[0017] In order to solve the problems raised in the above technical background, the utility model provides a dry mist sterilization device for blueberry fresh-keeping pretreatment.

[0018] The technical solution adopted by the utility model to solve its technical problems is:

[0019] The technical solution is a dry mist sterilization device for pretreatment of blueberry preservation, comprising an equipment frame and a conveyor belt, wherein the conveyor belt is installed by two sets of rollers installed on the equipment frame, and the conveyor belt is driven by a speed regulating motor, and is characterized in that: a primary sterilization chamber, a pneumatic turning chamber, a secondary sterilization chamber and a cold air drying chamber are arranged in sequence from the proximal end to the distal end of the conveyor above the blueberry bearing surface of the conveyor belt, wherein a branch air pipe and an air nozzle are installed in the pneumatic turning chamber, wherein the branch air pipe is arranged horizontally and across the width direction of the conveyor belt, and large holes at equal intervals are provided on the branch air pipe and a plurality of air nozzles are installed. The air nozzle is tilted toward the far end of the conveying, and the branch air pipe is connected to the high-pressure air source through the electromagnetic valve I and the pressure-limiting valve I. The electromagnetic valve I and the pressure-limiting valve I control the air nozzle to perform pulsed or continuous jetting. At least one venturi nozzle is installed on the top of the primary sterilization chamber and the secondary sterilization chamber respectively. The venturi nozzle is connected to the high-pressure air source and the solution container through the electromagnetic valve II and the pressure-limiting valve II. The electromagnetic valve II and the pressure-limiting valve II control the venturi nozzle to spray toward the direction where the blueberries are located. The cold air drying chamber includes a cold air blower and an air curtain pipe, wherein the air curtain pipe is arranged in the cold air drying chamber and is connected to the cold air blower.

[0020] The solution is further refined by arranging a roller between the two rollers, wherein the high point of the roller is higher than the high points of the two rollers. The conveyor belt is lifted by the roller and the bearing surface of the conveyor belt has a certain inclination angle to both sides with the roller as the dividing line, and the inclination angle is optimally designed to be between 3° and 8°, which can be adjusted arbitrarily according to production requirements.

[0021] According to a further refinement of the scheme, the inclination angle of the air nozzle is 15°.

[0022] The solution is further refined. A condensate recovery module is provided below the conveyor belts corresponding to the primary sterilization chamber and the secondary sterilization chamber. The condensate recovery module includes a funnel-shaped manifold and a recovery device or container installed below the manifold.

[0023] In a further refinement of the scheme, the high-pressure air source preferably uses an air compressor as the power of the atomizing device, and the air compressor is preferably an oil-free air compressor, which is equipped with a multi-stage filter.

[0024] In a further refinement of the scheme, the solution container contains hypochlorous acid solution or hydrogen peroxide solution.

[0025] The solution is further refined by setting corresponding humidity sensors in the primary sterilization chamber and the secondary sterilization chamber to measure the dry fog humidity.

[0026] In a further refinement of the solution, the shells of the primary sterilization chamber, the pneumatic turning chamber, the secondary sterilization chamber and the cold air drying chamber are stainless steel shells or plastic shells.

[0027] The solution is further refined by providing a material bin at the proximal end of the conveying conveyor belt and a pallet at the distal end of the conveying conveyor belt.

[0028] The scheme is further refined. The conveyor belt is a Teflon mesh conveyor belt. The specifications of the Teflon mesh conveyor belt are: thickness: 0.2 mm -1.35 mm, mesh: 1㎜-3mm, and the mesh shape is square.

[0029] The beneficial effects of the utility model are:

[0030] This experiment is mainly based on the needs of the industry. It needs to use a circulating conveyor belt for power transmission, and reasonably configure the dry fog sterilization module, pneumatic flip module, and cold air drying module for sterilization, flipping, sterilization and cold air drying. The entire surface of the blueberry is sprayed in an all-round and dead-angle manner to achieve surface sterilization of the blueberry. The blueberry is flipped by the flexible cooperation of pneumatic flipping and Teflon mesh conveyor belt to avoid secondary mechanical damage to the blueberry during flipping and transportation. This is of positive significance for ensuring the high quality of blueberries. Cold air drying can not only improve the adhesion of the fungicide but also pre-cool the blueberry. Through the implementation of this technology, the storage and transportation quality of blueberries is improved, and the commerciality of blueberries is improved. It can be widely used in the pilot experiment of blueberries, and after improvement, it can also be applied to the pretreatment production process of blueberries in batches on the assembly line.

[0031] The development of this device overcomes the environmental unfriendliness of the traditional immersion chemical sterilization method. While sterilizing, it can also improve the storage quality of fruits and vegetables, and has great development value in the field of fruit and vegetable preservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the utility model.

[0033] Figure 2 This is a partial structural diagram of the sterilization chamber of the dry mist sterilization device.

[0034] Figure 3 This is the assembly drawing of the roller and conveyor belt.

[0035] Figure 4 This is a partial structural diagram of the cold air drying chamber.

[0036] Figure 5 This is the assembly drawing of the active roller and the speed regulating motor.

[0037] Figure 6 This is the composition diagram of the cold air drying module.

[0038] Figure 7 This is a partial structure diagram of the Teflon mesh conveyor belt.

[0039] In the figure:

[0040] 00 High-pressure gas source, 01 Venturi nozzle, 02 Hypochlorous acid solution container, 03 Silo, 04 Pallet,

[0041] 10 rack, 11 cover,

[0042] 100 conveyor belt, 110 roller, 111 bearing assembly and bearing seat, 120 roller, 130 speed regulating motor,

[0043] 200 one-time sterilization chamber,

[0044] 300 air force to turn the chamber,

[0045] 400 secondary sterilization chamber,

[0046] 500 cold air drying chamber, 510 cold air blower, 520 air curtain tube,

[0047] 600 manifold, 620 condensation chamber, 610 recovery device or container,

[0048] The climbing bearing surface is A, and the downhill bearing surface is B. DETAILED DESCRIPTION

[0049] This embodiment is a dry mist sterilization device for pretreatment of blueberry preservation. The device includes, in order, a primary dry mist sterilization module, a pneumatic turning module, a secondary dry mist sterilization module and a cold air drying module. The above four modules are arranged in order on a special conveyor belt with a conveying function, so as to achieve all-round and dead-angle dry mist sterilization of blueberries, and cold air drying of the sterilized blueberries to further improve the adhesion effect. Figures 1 to 7 , explaining the ideas, implementation process and functions of this design.

[0050] In this embodiment, for ease of understanding and description, the device is positioned in three coordinates, that is, the X direction represents the longitudinal direction, the Y direction represents the lateral direction, and the Z direction represents the vertical direction.

[0051] The carrier of the device includes an equipment frame 10 and a conveyor belt 100. In the present technology, the equipment frame is constructed with aluminum alloy profiles, and a cover 11 with multiple modules is formed by cutting, sheet metal and welding with food-grade stainless steel plates. Specifically, the equipment frame is constructed with horizontal, longitudinal and vertical aluminum alloy profiles, and the equipment frame has a rectangular outline and forms an assembly line-style construction method.

[0052] Furthermore, the equipment frame made of the aluminum alloy frame can be installed with universal wheels with a self-locking mechanism, so that it has mobility and is easy to move.

[0053] The starting and tail ends of the equipment frame are rollers 110, and a roller 120 is added between the two rollers. The rollers and the ends of the rollers are fixedly mounted on the aluminum alloy frame through bearing assemblies and bearing seats 111. The high point of the roller 120 is higher than the high points of the two rollers. The conveyor belt passes over the rollers at both ends and is lifted by the rollers in the middle. Through the lifting of the rollers 120, the bearing surface (upward) of the conveyor belt 100 has a certain inclination to both sides with the rollers as the dividing line. The inclination should not be too large, and the inclination design is preferably 3° to 8°. Figure 1 Indicated by α, the bearing surfaces on both sides of the roller 120 form a climbing bearing surface A and a downhill bearing surface B in fact. The advantage of this inclination design is that during the climbing stage of blueberries, due to the existence of a certain inclination angle α, the blueberries there have a tendency to roll toward the low point (near the conveying end), and the above-mentioned blueberries are in a neat and flat state, maintaining effective uniformity, which is conducive to the spraying of the upper surface of the blueberries. When the conveyor belt passes over the high point of the roller, due to the flipping of the low point, the blueberries have a tendency to roll toward the far end of the conveying, and cooperate with the inclined air curtain nozzle to assist in gently blowing the blueberries to achieve the flipping of the blueberries. It is easy to understand that by adjusting the pressure of the air curtain nozzle, it is possible to achieve the blowing adjustment of blueberries of different levels, thereby achieving the pneumatic flipping of the blueberries. After the flipping, the blueberries are swapped in the positive and negative directions, that is, the upper part is replaced by the lower part, and the lower part is replaced by the upper part.

[0054] It should be noted that the number of blueberries on the bearing surface should be kept loose, that is, not tightly fitted, to ensure that the blueberries have a certain turning space on the downslope bearing surface B after passing the high point position, and the blueberries can be turned over under the action of the nozzle.

[0055] A pneumatic turning chamber 300 is constructed separately using stainless steel plates at the conveyor belt where the air curtain nozzle is located, and a branch air pipe and an air nozzle are installed in the chamber, wherein the branch air pipe is arranged horizontally and across the width direction of the conveyor belt, and a plurality of air nozzles are installed on the branch air pipe with large holes at equal intervals. The air nozzle is preferably arranged to be inclined toward the far end of the conveyor, and the specific angle is adjusted according to the actual situation, for example, the inclination angle is 15°. Figure 1 Indicated by β, the branch air pipe is connected to the high-pressure air source 00 through the air circuit and the electromagnetic valve Ⅰ (A1), and the pressure limiting valve Ⅰ (B1), and the above-mentioned air nozzle is controlled by the electromagnetic valve Ⅰ and the pressure limiting valve Ⅰ to perform pulsed or continuous air discharge, thereby realizing the pneumatic flipping of the blueberries. It is easy to understand that the above-mentioned high-pressure air source 00, the electromagnetic valve A1, the pressure limiting valve B1, the branch air pipe and the air nozzle together form an effective composition of the pneumatic flipping module, and the flipping of the blueberries is realized by blowing. The process is relatively gentle, and with the inclined design of the downhill bearing surface B, it will not cause mechanical damage to the blueberries.

[0056] The air nozzle in the pneumatic flip chamber generates airflow, which has a certain drying effect on the bactericidal liquid film on the surface of the blueberry, thereby improving the adhesion of the bactericide.

[0057] The front and rear sides of the chamber where the pneumatic turning module is located are respectively a primary sterilization chamber 200 and a secondary sterilization chamber 400, wherein a primary dry fog sterilization module is installed in the primary sterilization chamber 200, and a secondary dry fog sterilization module is installed in the secondary sterilization chamber 400, so as to spray and sterilize the primary surface and the secondary surface of the blueberries respectively. Specifically, at least one venturi nozzle 01 is installed on the top of the primary sterilization chamber and the secondary sterilization chamber respectively, and the venturi nozzle faces the direction where the blueberries are located, for example, vertically downward. The venturi nozzle 01 is connected to the high-pressure gas source 00 through the solenoid valve II (A2) and the pressure limiting valve II (B2), and is synchronously connected to the hypochlorous acid solution container 02. The spray intensity of the venturi nozzle is controlled by the solenoid valve II and the pressure limiting valve II, so as to spray the blueberries on the conveyor belt below efficiently.

[0058] Furthermore, a condensate recovery module is provided below the primary sterilization chamber 200 and the secondary sterilization chamber 400, and the condensate recovery module includes a funnel-shaped confluence plate 600, forming a funnel-shaped cavity, which can also be called a condensation chamber 620, and a recovery device or container 610 installed below the confluence plate. The dry mist generated by the above-mentioned venturi nozzle 01 is partially adsorbed by blueberries, and partially passes through the conveyor belt downward and is captured by the confluence plate to form droplets and is recovered. The recovered solution can be regenerated again after purification and can be reused, thereby increasing the utilization rate of the hypochlorous acid solution.

[0059] Furthermore, the above-mentioned high-pressure gas source 00 can use an air compressor as the power of the atomizing equipment. The pressure is directly related to the size of the atomized particles of the equipment. The pressure can be adjusted by adjusting the pressure with a pressure regulating valve and selecting a Venturi nozzle of appropriate specifications to achieve adjustment of different concentrations, which means that the controllable and adjustable performance is high.

[0060] Furthermore, the air compressor should be an oil-free air compressor. If an oil-containing air compressor is selected, a multi-stage filter should be installed to ensure that the air source provided is clean.

[0061] The cold air drying chamber 500 is located at the rear side of the secondary sterilization chamber. The cold air drying chamber uses a standby air cooler 510 as a power source. The air cooler is preferably a variable frequency air cooler, and the air volume can be adjusted by frequency conversion. The blueberries below are blown by multiple air curtain tubes 520 densely arranged on the top of the chamber. Each air curtain tube is equipped with multiple air nozzles to achieve uniform air output. The blowing force is not too strong to avoid dehydration of the blueberries and affect the taste. By speeding up the airflow, the cold air dryer dries the blueberries. Figure 6 .

[0062] The device can atomize green fungicides such as hypochlorous acid and hydrogen peroxide to make their particles reach micro-nano-level aerosols. At this time, the fungicide can fully contact the surface of blueberries in the environment, evenly adsorb the fungicide on the surface of blueberries, and cooperate with cold air drying to achieve the purpose of sterilization.

[0063] This study used hypochlorous acid water of different concentrations to carry out a bactericidal effect test. For example, the hypochlorous acid water was diluted with pure water to 20.0 mg / L, 30.0 mg / L, and 50.0 mg / L, respectively. The solutions of different concentrations were then atomized using this device for sterilization of the surface of blueberries.

[0064] Furthermore, by installing corresponding humidity sensors in the primary sterilization chamber 200 and the secondary sterilization chamber 400, the dry mist humidity inside the corresponding chamber can be measured, and the corresponding data can be collected and recorded to guide the scientific research process. Conversely, the spray volume of the Venturi nozzle can also be adjusted by the humidity value.

[0065] Furthermore, the above-mentioned Venturi nozzle 01 can spray continuously or intermittently or in pulses, and the parameters can be set according to actual conditions.

[0066] Furthermore, the low temperature and high humidity state of the primary sterilization chamber 200 and the secondary sterilization chamber 400 is beneficial to the moisture retention of blueberries.

[0067] The working principle of this device is to interact compressed air and hypochlorous acid solution in the Venturi nozzle to achieve atomization of hypochlorous acid solution, form micro-nano aerosol and fill the chamber surrounded by the stainless steel shell. The Venturi nozzle is equipped with a special structure inside to allow the hypochlorous acid solution to enter at least two different channels, one of which is passed through high-pressure gas, which moves at high speed along the channel, forming a certain negative pressure on the surroundings during this movement. According to the Venturi principle, the hypochlorous acid liquid in the damping tube is siphoned into the gas channel, and the liquid and gas are rubbed and mixed, and are ejected at the nozzle outlet. Under high-speed impact, the droplets are splashed around to turn into micro-nano aerosols. Due to the very small particle size, they can be suspended in the air, avoiding the formation of droplets in the environment.

[0068] The above-mentioned stainless steel shell can also be made of corrosion-resistant non-metallic materials commonly used in the chemical industry, such as PVC board.

[0069] Furthermore, a silo 03 is provided at the proximal end of the conveyor belt 100 for uniformly dropping and spreading blueberries, and a tray 04 is provided at the distal end of the conveyor belt for storing sterilized blueberries. It is easy to understand that the tray should also be sterilized with hypochlorous acid to avoid cross contamination.

[0070] One of the rollers 110 in the above-mentioned conveyor belt is driven by a speed regulating motor 130, and its operating speed can be adjusted according to actual needs to achieve the purpose of comprehensive sterilization of blueberries. For example, by running at a low speed, the dry fog sterilization time can be increased. The increase in sterilization time is conducive to the improvement of the sterilization rate, but after reaching 20s, the increase in the sterilization rate is not significant. Therefore, the sterilization time can be controlled by controlling the operating speed of the conveyor belt. Research on this device shows that the most suitable sterilization conditions are achieved by combining an effective hypochlorous acid concentration of 50.0 mg / L, a dry fog sterilization time of 10s and low-temperature storage and transportation, which can take into account both sterilization effect and work efficiency.

[0071] Furthermore, the conveyor belt 100 in this embodiment is preferably a Teflon mesh conveyor belt, Figure 7 The specifications of the Teflon mesh conveyor belt are thickness: 0.2-1.35mm, width: 300-4200mm, mesh: 1㎜-3mm square (such as 1X1mm, 2X2mm, etc.). The mesh is much smaller than the diameter of blueberries and can carry blueberry particles. The flexible conveyor net is more friendly to blueberries and will not cause bumps and damage to blueberries. In addition, the mesh design of the conveyor belt allows the mist fungicide formed by the spray to quickly penetrate the conveyor net, increasing the contact surface with the blueberries.

[0072] The above-mentioned Teflon mesh conveyor belt is made of high-performance glass fiber mesh cloth impregnated, and has been widely used in food, environmental protection, chemical industry, medicine and other fields. It is safe and non-toxic, and is very suitable for use in blueberry projects.

[0073] This Teflon mesh conveyor belt has good air permeability, that is, it has a high air permeability, which can meet the needs of dry fog penetration and cold air drying penetration, and reduce heat source consumption and improve sterilization efficiency.

[0074] The development of this device can produce dry fog and be used to sterilize blueberries. The device uses green fungicides such as hypochlorous acid and hydrogen peroxide and atomizes them to make their particles reach micro-nano aerosol level. At this time, the fungicide can fully contact the surface of blueberries in the environment and evenly adsorb the fungicide on the surface of blueberries to achieve the purpose of sterilization and disinfection, and perform air cooling and drying to improve production efficiency.

[0075] This technology analyzes the stress response regulation mechanism of blueberries to different environmental factors and different hazard factors during the post-harvest storage and transportation process, clarifies the characteristics and laws of post-harvest quality deterioration of blueberries, and develops this dry fog sterilization device. The commissioning of this device has positive significance for improving the penetration of mist preservatives and spraying uniformity.

[0076] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in the field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A dry mist sterilization device for pretreatment of blueberries for fresh-keeping, comprising an equipment frame (10) and a conveyor belt (100), wherein: The conveyor belt is installed by two sets of rollers installed on the equipment frame, and the conveyor belt is driven by a speed regulating motor, characterized in that: a primary sterilization chamber (200), a pneumatic turning chamber (300), a secondary sterilization chamber (400) and a cold air drying chamber (500) are arranged in sequence from the proximal end to the distal end of the conveying above the blueberry bearing surface of the conveyor belt (100), wherein a branch air pipe and an air nozzle are installed in the pneumatic turning chamber (300), wherein the branch air pipe is arranged horizontally and across the width direction of the conveyor belt, and a plurality of air nozzles are installed on the branch air pipe with large holes at equal intervals, and the air nozzles are arranged toward the distal end of the conveying and inclined, and the branch air pipe is connected to the air pipe through the electromagnetic valve I , a pressure-limiting valve I is connected to a high-pressure gas source (00), and the solenoid valve I and the pressure-limiting valve I control the gas nozzle to perform pulsed or continuous jetting; at least one venturi nozzle (01) is installed on the top of the primary sterilization chamber (200) and the secondary sterilization chamber (400), respectively, and the venturi nozzle (01) is connected to the high-pressure gas source (00) and the solution container (02) through the solenoid valve II and the pressure-limiting valve II, and the solenoid valve II and the pressure-limiting valve II control the venturi nozzle to spray in the direction where the blueberries are located; the cold air drying chamber (500) includes a cold air blower (510) and an air curtain pipe (520), wherein the air curtain pipe is arranged in the cold air drying chamber and is connected to the cold air blower.

2. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1 is characterized in that: A roller (120) is arranged between the two rollers, wherein the high point of the roller (120) is higher than the high points of the two rollers, and the conveyor belt is lifted by the roller so that the bearing surface of the conveyor belt (100) has a certain inclination angle on both sides with the roller as a dividing line.

3. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 2 is characterized in that: The inclination angle is 3° to 8°.

4. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1 is characterized in that: A condensed water recovery module is provided below the conveyor belts corresponding to the primary sterilization chamber (200) and the secondary sterilization chamber (400), and the condensed water recovery module comprises a funnel-shaped manifold (600) and a recovery device or container installed below the manifold.

5. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1 is characterized in that: The high-pressure air source (00) uses an air compressor as the power of the atomization equipment.

6. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1 is characterized in that: Humidity sensors are arranged in the primary sterilization chamber (200) and the secondary sterilization chamber (400).

7. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1 is characterized in that: The shells of the primary sterilization chamber (200), the pneumatic turning chamber (300), the secondary sterilization chamber (400) and the cold air drying chamber are stainless steel shells or plastic shells.

8. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1 is characterized in that: A material bin (03) is arranged at the conveying proximal end of the conveyor belt (100), and a tray (04) is arranged at the conveying distal end of the conveyor belt.

9. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1, characterized in that: The conveyor belt (100) is a Teflon mesh conveyor belt, and the specifications of the Teflon mesh conveyor belt are as follows: thickness: 0.2 mm-1.35 mm, mesh size: 1 mm-3 mm, and mesh size shape: square.

10. The dry mist sterilization device for blueberry fresh-keeping pretreatment according to claim 1, characterized in that: The solution container (02) contains hypochlorous acid solution or hydrogen peroxide solution.

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