A kiwifruit pressure difference precooling and ripening integrated device

Abstract

The present invention discloses a kiwifruit pressure differential precooling and ripening integrated device, wherein a pressure plate is installed on the top of a box, an evaporator is located in a device placement chamber, a fan corresponding to the evaporator is also installed in the device placement chamber, the air outlet of the evaporator is connected to the air inlet of the fan, an air outlet slot corresponding to the fan is opened in the middle of the pressure plate, the air outlet of the fan is located in the corresponding air outlet slot, and the fan quickly blows the evaporator exhaust air into the box to generate a pressure difference. The kiwifruit pressure differential precooling and ripening integrated device has the functions of rapid precooling and ripening, and strong convection gas is always maintained in the box during the entire ripening process, thereby generating a pressure difference between the air inlet duct and the return air duct, so that during precooling, the uniformity of the temperature and wind speed of the airflow passing through the kiwifruit is ensured, thereby ensuring the consistency of the precooling speed of the kiwifruit, and the precooling speed is fast, and during the ripening process, only starch degradation is promoted, shortening the degradation of pectin by pectinase, and the processed fruit can be eaten hard with peeling and has a long shelf life.

Description

Technical Field

[0001] The invention relates to commercial processing of kiwi fruit, in particular to a kiwi fruit pressure difference precooling and ripening integrated device. Background Art

[0002] Kiwifruit is a typical multi-seeded berry, a respiratory climacteric fruit. It is usually not edible directly when picked at a maturity suitable for storage, and the fruit quality is difficult to determine. For example, the fruit shape, fruit surface defects, non-point source pollution, fruit size, etc. are affected by many factors, resulting in a low commercial rate. For a long time, the commercial processing of domestic kiwifruit has mainly focused on grading and packaging, and the grading standards are not standardized. There is a serious lack of investment and attention in the research and integrated demonstration of technologies such as quality standard system, grading methods that take both internal and external quality into consideration, packaging types, fruit surface cleaning, ripening, and mechanical damage treatment, and the post-harvest commercial processing lacks systematicness. There are many quality problems with domestic kiwifruit, mainly manifested as: unstable internal quality, uneven softening, high incidence of soft rot, poor edible effect, and backward commercial processing technology. For a long time, kiwifruit has become a rotten fruit that "cannot be eaten when hard and cannot be eaten when soft" at the consumer end, which has seriously undermined consumers' trust. The main reason is that the quality control and commercial processing of fruits are not taken seriously, such as irregular harvesting in storage, rough grading and packaging operations, obvious squeeze injuries in logistics and transportation, resulting in serious mechanical damage, and widespread cold damage in storage, which has caused serious quality and food safety problems, leading to uneven softening of fruits, soft rot caused by susceptible bacteria, quality deterioration, and serious storage and logistics losses. According to preliminary statistics, the mechanical damage caused by kiwifruit picking reaches more than 5%, the mechanical damage rate in the grading and packaging links is as high as more than 10%, and the vibration and squeeze injuries caused during logistics and transportation reach more than 10%. In addition, mechanical damage accelerates softening and post-harvest pathogen infection, which ultimately leads to quality losses and losses of more than 40%. Therefore, the research on post-harvest commercial processing technology of kiwifruit is the technical basis for solving the bottleneck problem of the industry and realizing that kiwifruit can be eaten immediately after purchase and is not easy to perish for a long time, which is of great significance to improving the quality and efficiency of the industry.

[0003] After long-term research on kiwifruit commercial processing technology, the inventor developed a kiwifruit pressure differential precooling and ripening integrated device from the perspective of rapid precooling and rapid ripening of kiwifruit. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a kiwifruit pressure difference precooling and ripening integrated device, which solves the technical bottleneck of ready-to-eat kiwifruit and breaks the conventional practice that kiwifruit can only be eaten when it is soft.

[0005] The objective of the present invention is achieved through the following technical scheme: a kiwifruit pressure difference precooling and ripening integrated device, comprising a unit section and a precooling and ripening section, the unit section and the precooling and ripening section are connected, the unit section is provided with a refrigeration system, the precooling and ripening section comprises a box body, a heat preservation door is provided at the rear of the box body, the heat preservation door and the box body are sealed, a pressure plate is provided at the top of the box body, the cavity between the pressure plate and the box body forms an equipment placement cavity, the evaporator of the refrigeration system is located in the equipment placement cavity, and there are multiple evaporators, the air inlet of the refrigeration system is located at the bottom of the box body, a fan corresponding to the evaporator is also installed in the equipment placement cavity, the air outlet of the evaporator is connected to the air inlet of the fan, an air outlet slot corresponding to the fan is provided in the middle of the pressure plate, the air outlet of the fan is located in the corresponding air outlet slot, and the fan quickly blows the evaporator exhaust air into the box body.

[0006] Optionally, two rows of bottom support frames are provided at the bottom of the box, and the two rows of bottom support frames are arranged side by side and at intervals. The racks for holding kiwis are stacked on the two rows of bottom support frames, thereby forming an air inlet duct between the stacked racks, and the air outlet slot is located above the air inlet duct, and a bottom duct is formed between the bottom rack and the bottom support frame, and a return air duct is formed between the rack and the side wall of the box.

[0007] Optionally, the axis line of the air outlet slot coincides with the axis line of the air inlet duct on the projection surface of the top of the box body.

[0008] Optionally, a supply air static pressure box is provided at the top of the air inlet duct, and a return air static pressure box is provided at the top of the return air duct.

[0009] Optionally, a heater is also installed in the equipment placement cavity, the air inlet of the heater is installed with an air suction main pipe, the end of the air suction main pipe is provided with an air suction branch pipe, the air inlet of the air suction branch pipe is located at the bottom of the box, and the air outlet of the heater is connected to the air inlet of the fan.

[0010] Optionally, an ethylene generator is also installed in the equipment placement cavity, the ethylene release port of the ethylene generator is located in the box below the pressure plate, and a plurality of detectors for detecting ethylene concentration are installed in the box below the pressure plate.

[0011] Optionally, a ventilation system is also provided in the unit section, the ventilation system includes an air suction pump and an exhaust pump, the air inlet of the air suction pump is connected to the outside air, the air outlet of the air suction pump is located at the bottom of the box, the air inlet of the exhaust pump is connected to the bottom of the box, and the air outlet of the exhaust pump is connected to the outside air.

[0012] Optionally, the unit section also has an electrical control box, which has a controller. The refrigeration system, fan, ethylene generator, ventilation system, and heater are all electrically connected to the controller, and the controller controls the operation of the refrigeration system, fan, ethylene generator, ventilation system, and heater respectively.

[0013] Optionally, hoisting holes are provided at the bottom of the unit section and the pre-cooling and ripening section for easy hoisting.

[0014] Optionally, ventilation grilles are provided on the side walls of the unit section to facilitate heat dissipation of the controller.

[0015] The present invention has the following advantages:

[0016] 1. The kiwifruit pressure difference precooling and ripening integrated device of the present invention has the functions of rapid precooling and ripening. During the whole ripening process, the box always maintains strong convection gas, thereby generating a pressure difference between the air inlet duct and the return air duct. During rapid precooling, the uniformity of the temperature and wind speed of the airflow passing through the kiwifruit is ensured, thereby ensuring the consistency of the precooling speed of the kiwifruit, and the precooling speed is fast, fundamentally solving the problem of poor precooling effect caused by large wind speed differences and uneven precooling speed when other mobile pressure difference precooling equipment passes through the kiwifruit; during the ripening process, only starch degradation is promoted by controlling the temperature, shortening the degradation of pectin by pectinase, and the processed fruit can be peeled hard and eaten with a long shelf life

[0017] 2. The kiwifruit pressure difference precooling and ripening integrated device of the present invention has a design of a precooling and ripening integrated machine, which improves the versatility of the equipment and is conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 Schematic diagram of gas flow in the box;

[0020] In the figure, 100-unit section, 200-precooling and ripening section, 101-refrigeration system, 102-ventilation system, 103-electrical control box, 104-ventilation grille, 201-evaporator, 202-fan, 203-heater, 204-pressing plate, 205-air suction main pipe, 206-double-leaf insulation door, 207-air suction branch pipe, 208-bottom support frame, 209-inlet air duct, 210-bottom air duct, 211-return air duct, 212-box body. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 As shown, a kiwifruit pressure difference precooling and ripening integrated device includes a unit section 100 and a precooling and ripening section 200. The unit section 100 and the precooling and ripening section 200 are connected. The unit section 100 has a refrigeration system 101. In this embodiment, the refrigeration system 101 is a prior art, and the refrigeration system 101 includes a condenser, a compressor, a filter dryer and an evaporator 201. The condenser, the compressor, and the filter dryer are all located at the bottom of the unit section 100. Through the refrigeration system 101, cooling gas or heating gas can be obtained.

[0028] In this embodiment, if Figure 1 As shown, the pre-cooling and ripening section 200 includes a box body 212, and a double-leaf insulation door 206 is opened at the rear of the box body 212. The box body 212 is a polyurethane insulation box body 212 with a single-sided stainless steel 304 plate. The double-leaf insulation door 206 and the box body 212 are sealed by a sealing strip to ensure the sealing performance of the box body 212. In this embodiment, a pressure plate 204 is installed on the top of the box body 212, and the cavity between the pressure plate 204 and the box body 212 forms an equipment placement cavity, which is mainly used to place equipment. In this embodiment, the evaporator 201 of the refrigeration system 101 is located in the equipment placement cavity, and there are multiple evaporators 201. The air inlet of the refrigeration system 101 is located at the bottom of the box body 212. Therefore, the wind in the box body 212 is continuously circulated under the action of the refrigeration system 101, that is, the wind in the box body 212 is sucked in by the air compressor, and then the refrigeration Or after heating, it enters the box body 212 through the evaporator 201. A fan 202 corresponding to the evaporator 201 is also installed in the equipment placement cavity. The air outlet of the evaporator 201 is connected to the air inlet of the fan 202. An air outlet slot corresponding to the fan 202 is opened in the middle of the pressure plate 204. The air outlet of the fan 202 is located in the corresponding air outlet slot, and the fan 202 quickly blows the exhaust air from the evaporator 201 into the box body 212. When the kiwi fruit needs to be cooled, the refrigeration system 101 is adjusted to the cooling mode, and the cold air discharged from the evaporator 201 is blown into the box body 212 at a high speed through the fan 202, thereby completing the rapid cooling of the kiwi fruit. When the kiwi fruit needs to be heated, the refrigeration system 101 is adjusted to the heating mode, and the hot air discharged from the evaporator 201 is blown into the box body 212 at a high speed through the fan 202, thereby completing the rapid heating of the kiwi fruit.

[0029] In this embodiment, if Figure 1 He Ru Figure 2As shown, two rows of bottom support frames 208 are arranged at the bottom of the box 212, and the two rows of bottom support frames 208 are arranged side by side at intervals. The racks for holding kiwifruit are stacked on the two rows of bottom support frames 208, and then an air inlet duct 209 is formed between the stacked racks, and the air outlet slot is located above the air inlet duct 209. A bottom duct 210 is formed between the bottom rack and the bottom support frame 208, and a return air duct 211 is formed between the rack and the side wall of the box 212. Therefore, after the kiwifruit is placed, a lifting platform is placed between the bottom kiwifruit rack and the bottom support frame 208. The bottom support frame 208 can be a guide rail to facilitate the placement of the rack for holding kiwifruit. The lifting platform is a prior art. The bottom of the lifting platform is placed mainly to facilitate the placement of the kiwifruit. In this embodiment, the lifting platform has another The function is that when the kiwi fruit holders are almost placed, the lifting platform is raised so that the kiwi fruit holders on the top are in contact with the pressing plate 204, so that the top of the kiwi fruit holders and the pressing plate 204 are sealed or the gap is very small. At this time, the high-speed airflow blown in from the air inlet duct 209 is quickly blown into the bottom of the box body 212, and enters the return air duct 211 from the bottom channel, and the airflow in the return air duct 211 enters the air inlet duct 209 again from the gap of the holder, thereby forming a convection cycle. In this embodiment, due to the presence of the fan 202, a high-speed airflow will be formed in the air inlet duct 209, so a positive pressure difference will be formed between the air inlet duct 209 and the return air duct 211, so that the airflow is forced to pass over the surface of the kiwi fruit, thereby achieving the effect of rapid pre-cooling or rapid heating.

[0030] In this embodiment, when refrigerating, the temperature of the fruit core needs to be quickly reduced to 1°C. Of course, in order to detect the temperature inside the box 212, a temperature detector is provided in the box 212. When the temperature of the fruit core reaches the requirement, the double-leaf insulation door 206 is opened, and then the rack containing the kiwifruit is quickly placed in the refrigerator for refrigeration.

[0031] After the kiwifruit is physiologically mature, the sugar exists in the form of starch, and it can only be eaten after the starch is degraded into disaccharides. In theory, starch conversion must be induced by low temperature for a certain period of time before it can be degraded and converted. In production, starch degradation is generally carried out in a cold storage, but this process is relatively slow. In addition, affected by the consistency of fruit quality, the pectinase decomposition of pectin is also carried out during the starch conversion process, which causes the fruit to be inconsistent in hardness and softness after leaving the warehouse, and the shelf life is short. Therefore, the kiwifruit needs to be ripened. In this embodiment, when ripening is required, the refrigerated kiwifruit is placed in the box 212. Similarly, the top of the kiwifruit rack and the pressure plate 204 are sealed or the gap is very small through the lifting platform. At this time, the refrigeration system 101 starts the heating mode and discharges hot air through the evaporator 201. The hot air is blown into the air inlet duct 209 at high speed under the action of the fan 202. Similarly, a positive pressure difference will be formed between the air inlet duct 209 and the return air duct 211, thereby making The airflow is forced to pass over the surface of the kiwifruit, thereby achieving a rapid heating effect. In the present embodiment, in order to make the two rows of kiwifruit cooled or heated as evenly as possible, the axis line of the air outlet slot coincides with the axis line of the air inlet duct 209 on the projection surface of the top of the box body 212, so that the airflow in the two return air ducts 211 is evenly distributed. Furthermore, an air supply static pressure box is provided on the top of the air inlet duct 209, and a return air static pressure box is provided on the top of the return air duct 211, thereby ensuring the uniformity of the temperature and wind speed passing through the fruits and vegetables, thereby ensuring the consistency of the pre-cooling speed of the kiwifruit, and the pre-cooling speed is fast, which fundamentally solves the problem of poor pre-cooling effect caused by large differences in wind speed when passing over different parts of fruits and vegetables and uneven pre-cooling speed in other mobile pressure difference pre-cooling equipment.

[0032] In this embodiment, if Figure 1 As shown, a heater 203 is also installed in the equipment placement cavity, and an air suction pipe 205 is installed at the air inlet of the heater 203. An air suction branch pipe 207 is provided at the end of the air suction pipe 205. The air inlet of the air suction branch pipe 207 is located at the bottom of the box 212, and the air outlet of the heater 203 is connected to the air inlet of the fan 202. The air flow is heated by the heater 203, so that the temperature of the air flow is increased again, which can further accelerate the problem in the box 212.

[0033] In this embodiment, in order to improve the ripening efficiency of kiwifruit, an ethylene generator is also installed in the equipment placement chamber. The ethylene release port of the ethylene generator is located in the box 212 below the pressing plate 204, and a plurality of detectors for detecting ethylene concentration are installed in the box 212 below the pressing plate 204. The detector can detect the ethylene concentration inside the box 212. When the ethylene concentration in the box 212 is too high, fresh air needs to be added to the box 212, and the gas in the box 212 needs to be exhausted to reduce the ethylene content. Therefore, in this embodiment, A ventilation system 102 is also provided in the unit section 100. The ventilation system 102 includes an air suction pump and an exhaust pump. The air inlet of the air suction pump is connected to the outside air, and the air outlet of the air suction pump is located at the bottom of the box 212. The air inlet of the exhaust pump is connected to the bottom of the box 212, and the air outlet of the exhaust pump is connected to the outside air. When the ethylene concentration exceeds the set value, the air suction pump and the exhaust pump work, the air suction pump sucks fresh air from the outside into the box 212, and the exhaust pump discharges excess gas in the box 212, thereby maintaining the balance of the air pressure in the box 212.

[0034] During the ripening process, temperature change treatment is required. During ripening, kiwifruit with a core temperature of 0.5℃~1℃ is placed in a kiwifruit pressure difference precooling and ripening integrated device for heating and ripening. During the heating process, the kiwifruit pressure difference precooling and ripening integrated device is used to generate strong convection gas from the air inlet duct to the return air ducts on both sides in the box to quickly heat up the core temperature of the kiwifruit. Due to the strong convection gas, a pressure difference is generated between the air inlet duct and the return air duct. The gas quickly passes through the surface of the kiwifruit under the action of the pressure difference, thereby rapidly heating up the core temperature of the kiwifruit, thereby promoting the core temperature. The temperature is quickly raised to 25°C and kept warm for 4h-6h, then lowered to 5°C-10°C and kept warm for 20h-24h, and then raised to 15°C~18°C and kept warm for 36h~48h. The kiwifruit is ripened. During the whole ripening process, there is strong convection gas in the box. In this embodiment, the kiwifruit with a core temperature of 0.5°C~1°C is kiwifruit refrigerated in a cold storage or kiwifruit that has been quickly precooled by a kiwifruit pressure difference precooling and ripening integrated device. During the ripening process, the temperature change treatment only promotes starch degradation and shortens the pectin degradation by pectinase. The treated fruit can be peeled hard and eaten with a long shelf life.

[0035] In this embodiment, if Figure 1As shown, the unit section 100 also has an electrical control box 103, and the electrical control box 103 has a controller. The refrigeration system 101, the fan 202, the ethylene generator, the ventilation system 102, and the heater 203 are all electrically connected to the controller. The controller controls the refrigeration system 101, the fan 202, the ethylene generator, the ventilation system 102, and the heater 203 to work. In this embodiment, the controller, the refrigeration system 101, the fan 202, the ethylene generator, the ventilation system 102, and the heater 203 are connected to the controller through wires, and the controller adopts a commercially available product, preferably a PLC controller, so as to control the refrigeration system 101. , fan 202, ethylene generator, ventilation system 102, heater 203. Of course, in order to improve the convenience of operation of the device, a touch control panel can be set on the outside of the unit section 100, and the control panel can display the working status of the refrigeration system 101, fan 202, ethylene generator, ventilation system 102, and heater 203. The control command can be input to the controller by turning it on and inputting parameters, and the input and output of the controller are realized through the control panel. This is the prior art and will not be elaborated on. In order to ensure the heat dissipation of the controller, a ventilation grille 104 is provided on the side wall of the unit section 100 to facilitate the heat dissipation of the controller.

[0036] In this embodiment, the bottoms of the unit section 100 and the pre-cooling and ripening section 200 are provided with hoisting holes for easy hoisting. By inserting hoisting tools into the hoisting holes, the movement of the device can be achieved.

[0037] In this embodiment, the air inlet of the refrigeration system 101, the air inlet of the suction pump, the exhaust port of the exhaust pump, and the air inlet of the suction branch pipe 207 are all located at the corners of the box body 212, so that when sucking or taking in air, the pressure difference between the air inlet duct 209 and the return air duct 211 in the box body 212 will not be affected.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A kiwifruit pressure differential precooling and ripening integrated device, comprising a unit section and a precooling and ripening section, wherein the unit section is connected to the precooling and ripening section, and a refrigeration system is provided in the unit section, characterized in that: The precooling and ripening section comprises a box body, a heat-insulating door is provided at the rear portion of the box body, the heat-insulating door and the box body are sealed and installed, a pressure plate is installed at the top of the box body, the cavity between the pressure plate and the box body forms an equipment placement cavity, the evaporator of the refrigeration system is located in the equipment placement cavity, and the evaporator is multiple, the air inlet of the refrigeration system is located at the bottom of the box body, a fan corresponding to the evaporator is also installed in the equipment placement cavity, the air outlet of the evaporator is connected to the air inlet of the fan, an air outlet slot corresponding to the fan is provided in the middle portion of the pressure plate, the air outlet of the fan is located in the corresponding air outlet slot, and the fan quickly blows the exhaust air of the evaporator into the box body, and two rows of bottom support frames are provided at the bottom of the box body, the two rows of bottom support frames are arranged side by side and spaced apart, and the racks for holding kiwifruit are stacked on the two rows of bottom support frames, thereby forming an air inlet duct between the stacked racks. The air outlet slot is located above the air inlet duct, and the axis line of the air outlet slot coincides with the axis line of the air inlet duct on the projection surface of the top of the box body, a bottom duct is formed between the bottom bracket and the bottom support frame, and a return air duct is formed between the bracket and the side wall of the box body, and a lifting platform is placed between the bottom bracket and the bottom support frame. The lifting platform is raised so that the kiwi fruit bracket at the top contacts with the pressing plate, thereby sealing the top of the kiwi fruit bracket and the pressing plate. At this time, the high-speed airflow blown in from the air inlet duct is quickly blown into the bottom of the box body and enters the return air duct from the bottom channel, and the airflow in the return air duct enters the air inlet duct again from the gap of the bracket, thereby forming a convection cycle, and the fan quickly blows the evaporator exhaust wind into the box body, a high-speed airflow is formed in the air inlet duct, and then a positive and negative pressure difference is formed between the air inlet duct and the return air duct, so that the airflow is forcibly swept over the surface of the kiwi fruit.

2. The kiwifruit pressure differential precooling and ripening integrated device according to claim 1, characterized in that: An air supply static pressure box is arranged on the top of the air inlet duct, and a return air static pressure box is arranged on the top of the return air duct.

3. The kiwifruit pressure differential precooling and ripening integrated device according to claim 2, characterized in that: A heater is also installed in the equipment placement cavity, the air inlet of the heater is installed with an air suction main pipe, the end of the air suction main pipe is provided with an air suction branch pipe, the air inlet of the air suction branch pipe is located at the bottom of the box, and the air outlet of the heater is connected to the air inlet of the fan.

4. The kiwifruit pressure differential precooling and ripening integrated device according to claim 3, characterized in that: An ethylene generator is also installed in the equipment placement chamber, and the ethylene release port of the ethylene generator is located in the box below the pressing plate, and a plurality of detectors for detecting ethylene concentration are installed in the box below the pressing plate.

5. The kiwifruit pressure differential precooling and ripening integrated device according to claim 4, characterized in that: A ventilation system is also provided in the unit section, and the ventilation system includes an air suction pump and an exhaust pump. The air inlet of the air suction pump is connected to the outside air, and the air outlet of the air suction pump is located at the bottom of the box. The air inlet of the exhaust pump is connected to the bottom of the box, and the air outlet of the exhaust pump is connected to the outside air.

6. The kiwifruit pressure differential precooling and ripening integrated device according to claim 5, characterized in that: The unit section also has an electrical control box, which has a controller. The refrigeration system, the fan, the ethylene generator, the ventilation system, and the heater are all electrically connected to the controller, and the controller controls the operation of the refrigeration system, the fan, the ethylene generator, the ventilation system, and the heater respectively.

7. The kiwifruit pressure differential precooling and ripening integrated device according to claim 6, characterized in that: The bottoms of the unit section and the pre-cooling and ripening section are both provided with hoisting holes for easy hoisting.

8. The kiwifruit pressure differential precooling and ripening integrated device according to claim 7, characterized in that: A ventilation grille is arranged on the side wall of the unit section to facilitate heat dissipation of the controller.

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