Vegetable fresh-keeping and transporting device

Abstract

The invention relates to the technical field of vegetable transportation, in particular to a vegetable fresh-keeping transportation device which comprises a container, a box door, an inner box body, a bottom plate, a transportation frame, a gas supply assembly and an automatic ventilation assembly, the bottom of the container is provided with the rotatable bottom plate, the bottom plate is provided with the transportation frame and the gas supply assembly, and the bottom of the container communicates with the automatic ventilation assembly. The gas supply assembly is used for conveying fresh-keeping mixed gas to the inner box body, and the automatic ventilation assembly achieves air circulation outside the inner box body through airflow and the piezoelectric effect. According to the vegetable fresh-keeping transportation device, through a gas mixing structure, a suitable gas environment can be stably maintained according to the breathing characteristics of vegetables, too fast respiratory metabolism of the vegetables is inhibited, the phenomena of water loss, wilting and oxidative deterioration are reduced, fresh-keeping gas can evenly permeate into a vegetable storage area, and the problem that a traditional transportation device is insufficient in gas adjusting capacity is solved; the rotting loss of the vegetables in long-distance transportation is reduced, and the original quality and taste of the vegetables are better maintained.

Description

Technical Field

[0001] This invention relates to the field of vegetable transportation technology, specifically to a vegetable preservation and transportation device. Background Technology

[0002] As perishable fresh agricultural products, vegetables require stringent requirements for the gas composition of their storage environment during long-distance logistics and transportation. Appropriate oxygen and carbon dioxide concentrations are crucial for slowing down respiration and maintaining freshness. Currently available vegetable transport devices generally suffer from insufficient modified atmosphere storage capabilities, making it difficult to meet the preservation needs of long-distance vegetable transport.

[0003] Existing transport equipment mostly uses ordinary sealed boxes or simple insulated boxes, lacking automated gas mixing, concentration monitoring, and precise delivery systems. This makes it impossible to dynamically adjust the internal gas environment based on the respiration characteristics of vegetables. Some simple modified atmosphere devices can only passively introduce a single gas, unable to monitor and precisely control O2 and CO2 concentrations in real time, making it difficult to create and maintain a stable gaseous atmosphere suitable for vegetable preservation.

[0004] Meanwhile, the gas distribution structure of traditional equipment is poorly designed, preventing the preservative gas from penetrating evenly into the vegetable storage area. This easily leads to localized gas concentration imbalances, causing problems such as anaerobic respiration, oxidative spoilage, and wilting in the vegetables. Furthermore, the equipment cannot adapt to the controlled atmosphere requirements of different transportation scenarios, such as short-distance land transport and long-distance sea transport. The preservation effect is unstable, resulting in a high rate of vegetable spoilage and loss, severely impacting product quality and economic benefits, and hindering the efficient development of large-scale, long-distance cold chain transportation of vegetables. Summary of the Invention

[0005] The purpose of this invention is to provide a vegetable preservation and transportation device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a vegetable preservation and transportation device, comprising a container, a door, an inner box, a bottom plate, a transport frame, a gas supply component, and an automatic ventilation component. The container has a hinged door on the front, an inner box inside, a rotatable bottom plate at the bottom, a transport frame and a gas supply component mounted on the bottom plate, and an automatic ventilation component connected to the bottom of the container. The gas supply component is used to supply preservation mixed gas to the inner box, and the automatic ventilation component utilizes airflow and piezoelectric effect to achieve air circulation between the inner box and the outside.

[0007] Preferably, the container has a movable groove at the bottom, a partition is fixed in the movable groove, a bottom plate is connected above the partition, a motor is installed at the bottom of the inner wall of the container, the motor is connected to a rotating shaft via a transmission box, the rotating shaft is fixed to the bottom plate, and drives the bottom plate to rotate horizontally or tilted.

[0008] Preferably, the top of the base plate is provided with a slide rail, and a sliding frame is slidably connected on the slide rail. The transport frame is placed on the sliding frame. The top of the base plate is also provided with an installation frame. The installation frame is connected to a fixed magnetic block through a fixed frame one, a telescopic frame, and a fixed frame two. The fixed magnetic block adsorbs the iron plate on the top of the inner box to achieve positioning.

[0009] Preferably, the gas supply assembly includes a mounting frame, a gas cylinder, a flow meter, a vent valve, a gas mixing chamber, a vent pipe, and an inlet pipe. The mounting frame is installed on the inner wall of the container, and the gas cylinder is placed inside the mounting frame. The gas cylinder is connected in sequence to the flow meter, the vent valve, and the gas mixing chamber. The gas mixing chamber has a vent pipe extending into the inner chamber on the front and an inlet pipe extending to the outside on the back. Both the vent pipe and the inlet pipe are equipped with one-way valves.

[0010] Preferably, the gas mixing chamber has a built-in O2 / CO2 concentration sensor, an STM32H7 microcontroller, and two miniature air pumps, which can mix oxygen and air into an ideal preservation gas and send it into the inner chamber.

[0011] Preferably, the four corners of the inner wall of the transport frame are provided with fixing plates, the fixing plates are connected to the silicone rubber membrane breathable plate via rubber pads, the silicone rubber membrane breathable plate is provided with telescopic breathable holes with adjustable aperture, the transport frame is provided with breathable holes on the side and can be stacked.

[0012] Preferably, the automatic ventilation assembly includes a ventilation duct, an air intake box, a telescopic airbag, a piezoelectric ceramic plate, a compression spring, an electromagnetic plate, an inverter, a permanent magnet plate, a telescopic spring, and a baffle. The ventilation duct connects the bottom of the container to the outside of the inner container body, and telescopic airbags are provided at both ends. The inner wall of the telescopic airbag is connected to the compression spring and the piezoelectric ceramic plate, and the outer wall is fixed with the electromagnetic plate. The air intake box contains an inverter and a permanent magnet plate. The permanent magnet plate is fixed by the telescopic spring and has a sliding baffle connected to the bottom. The piezoelectric ceramic plate is electrically connected to the electromagnetic plate through the inverter. The airflow drives the telescopic airbag to deform and generate electricity, which controls the reciprocating motion of the permanent magnet plate and the baffle to achieve ventilation.

[0013] Preferably, the telescopic airbag repeatedly bulges and contracts under the action of external airflow pressure difference, which drives the compression spring to strike the piezoelectric ceramic plate to generate current. The current is converted into alternating current by the inverter, which causes the electromagnetic plate to periodically attract and repel the permanent magnet plate, driving the baffle to open and close so that air can periodically enter the outside of the inner box.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This vegetable preservation and transportation device, through its gas mixing structure, can stably maintain a suitable gaseous environment based on the respiration characteristics of vegetables, inhibiting excessively rapid respiration and metabolism, reducing water loss, wilting, and oxidative spoilage. The preservative gas can evenly penetrate into the vegetable storage area, ensuring a consistent overall preservation effect. This improves upon the insufficient controlled atmosphere capacity of traditional transportation devices, reduces spoilage and loss of vegetables during long-distance transportation, better maintains the original quality and taste of vegetables, and enhances the economic benefits of fresh produce transportation.

[0015] 2. This vegetable preservation and transportation device, through its tiltable and rotatable base plate and sliding conveyor structure, reduces the intensity of manual handling and improves loading efficiency. During transportation, it relies on magnetic limiting and telescopic support structures to reliably fix the vegetable storage carrier, avoiding collision damage caused by bumps and shaking during transportation, and protecting the integrity of the vegetables. The overall structural design takes into account both ease of operation and transportation safety, making vegetable loading and unloading more efficient and transportation more stable, and adapting to the needs of large-scale vegetable transportation.

[0016] 3. This vegetable preservation and transportation device achieves passive automatic ventilation through natural airflow during transportation. It can complete the air circulation inside and outside the box without external power supply, and promptly remove the heat and moisture accumulated inside, keeping the transportation environment dry and suitable. The ventilation design enhances the adaptability of the device in long-distance transportation and is suitable for transportation scenarios far from power supply. It continuously and stably improves the internal environmental conditions, avoids the accelerated spoilage of vegetables due to high temperature and humidity, further enhances the preservation effect, and extends the safe transportation time of vegetables.

[0017] 4. This vegetable preservation and transportation device can simultaneously meet the needs of vegetable transportation at different distances and in different environments. There is no need to change equipment for different scenarios, which reduces the cost of use. The vegetable storage carriers can be stacked flexibly to make full use of the internal space and improve space utilization. The overall structure is sturdy and durable, and the components work together stably to ensure long-term reliable operation, taking into account the preservation effect, usage efficiency and equipment durability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall container structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the container of the present invention; Figure 3 This is a schematic diagram of the internal structure of the inner box of the present invention; Figure 4 This is a schematic diagram of the gas mixing box structure of the present invention; Figure 5 This is a schematic diagram of the base plate structure of the present invention; Figure 6 This is a schematic diagram of the transport frame structure of the present invention; Figure 7 This is a schematic diagram of the partition installation structure of the present invention; Figure 8This is a schematic diagram of the container bottom structure of the present invention; Figure 9 This is a schematic diagram of the ventilation slot structure of the present invention; Figure 10 for Figure 9 Enlarged schematic diagram of the structure at point A in the middle; Figure 11 This is a side sectional view of the telescopic airbag of the present invention; Figure 12 This is a schematic diagram of the telescopic frame structure of the present invention.

[0020] In the diagram: 1. Container; 2. Door; 3. Door panel; 4. Inner container; 401. Fixing frame; 402. Gas cylinder; 403. Flow meter; 404. Vent valve; 405. Gas mixing box; 406. Vent pipe; 407. Inlet pipe; 5. Mounting bracket; 501. Mounting bolt; 502. Fixing frame one; 503. Telescopic frame; 504. Fixing frame two; 505. Fixing magnet; 6. Base plate; 601. Slide rail; 602. Sliding frame; 603. Motor; 604. Transmission box; 605. Rotating shaft; 606. Movable groove; 607. Partition plate; 7. Transport frame; 701. Silicone rubber membrane breathable plate; 702. Fixing plate; 703. Rubber pad; 704. Ventilation hole; 8. Telescopic airbag; 801. Compression spring; 802. Piezoelectric ceramic plate; 803. Electromagnetic plate; 804. Ventilation groove; 805. Air inlet box; 806. Inverter; 807. Permanent magnet plate; 808. Telescopic spring; 809. Fixing block; 810. Baffle. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Please see Figures 1-12The present invention provides a technical solution: a vegetable preservation and transportation device, including a container 1, a door 2, an inner box 4, a bottom plate 6, a transport frame 7, a gas supply component and an automatic ventilation component. The container 1 has a door 2 hinged to the front, an inner box 4 inside, and a rotatable bottom plate 6 at the bottom. The transport frame 7 and the gas supply component are installed on the bottom plate 6. The bottom of the container 1 is connected to the automatic ventilation component. The gas supply component is used to supply preservation mixed gas to the inner box 4. The automatic ventilation component uses airflow and piezoelectric effect to realize the external air circulation of the inner box 4.

[0024] A movable groove 606 is opened at the bottom of container 1. A partition 607 is fixed inside the movable groove 606. A bottom plate 6 is connected above the partition 607. A motor 603 is installed at the bottom of the inner wall of container 1. The motor 603 is connected to a rotating shaft 605 via a transmission box 604. The rotating shaft 605 is fixed to the bottom plate 6 and drives the bottom plate 6 to rotate horizontally or tilted. A slide rail 601 is provided at the top of the bottom plate 6. A sliding frame 602 is slidably connected to the slide rail 601. The transport frame 7 is placed on the sliding frame 602. An installation frame 5 is also provided at the top of the bottom plate 6. The installation frame 5 is connected to a fixed magnetic block 505 through a fixed frame 1 502, a telescopic frame 503, and a fixed frame 2 504. The fixed magnetic block 505 attracts the iron plate at the top of the inner container 4 to achieve a limit position.

[0025] The gas supply assembly includes a mounting bracket 401, a gas cylinder 402, a flow meter 403, a vent valve 404, a gas mixing chamber 405, a vent pipe 406, and an inlet pipe 407. The mounting bracket 401 is installed on the inner wall of container 1. The gas cylinder 402 is placed inside the mounting bracket 401. The gas cylinder 402 is connected in sequence to the flow meter 403, the vent valve 404, and the gas mixing chamber 405. The gas mixing chamber 405 has a vent pipe 406 extending into the inner chamber 4 on the front and an inlet pipe 407 extending to the outside on the back. Both the vent pipe 406 and the inlet pipe 407 are equipped with one-way valves. The gas mixing chamber 405 has an internal O2 / CO2 concentration sensor, an STM32H7 microcontroller, and two miniature air pumps, which can mix oxygen and air into an ideal state of preservation gas and send it into the inner chamber 4.

[0026] The four corners of the inner wall of the transport frame 7 are provided with fixing plates 702. The fixing plates 702 are connected to the silicone rubber membrane breathable plate 701 via rubber pads 703. The silicone rubber membrane breathable plate 701 is provided with telescopic breathable holes with adjustable aperture. Breathable holes 704 are opened on the side of the transport frame 7, and it can be stacked.

[0027] The automatic ventilation assembly includes a ventilation slot 804, an air intake box 805, a telescopic airbag 8, a piezoelectric ceramic plate 802, a compression spring 801, an electromagnetic plate 803, an inverter 806, a permanent magnet plate 807, a telescopic spring 808, and a baffle 810. The ventilation slot 804 connects the bottom of the container 1 to the outside of the inner box 4, and telescopic airbags 8 are provided at both ends. The inner wall of the telescopic airbag 8 is connected to the compression spring 801 and the piezoelectric ceramic plate 802, and the outer wall is fixed with the electromagnetic plate 803. The air intake box 805 contains the inverter 806 and the permanent magnet plate 807, and the permanent magnet plate 807 is fixed by the telescopic spring 808. The bottom is connected to a sliding baffle 810. The piezoelectric ceramic plate 802 is electrically connected to the electromagnetic plate 803 via the inverter 806. The airflow drives the telescopic airbag 8 to deform and generate electricity, which controls the reciprocating motion of the permanent magnet plate 807 and the baffle 810 to achieve ventilation. The telescopic airbag 8 repeatedly bulges and contracts under the action of the external airflow pressure difference, which drives the compression spring 801 to strike the piezoelectric ceramic plate 802 to generate current. The current is converted into alternating current by the inverter 806, which causes the electromagnetic plate 803 to periodically attract and repel the permanent magnet plate 807, driving the baffle 810 to open and close so that air can periodically enter the outside of the inner box 4.

[0028] Container 1 has hinged doors 2 on both sides of its front, and door panels 3 fixedly connected to the sides. A movable groove 606 is provided at the bottom of container 1. A partition 607 is fixedly connected to the bottom of the inner wall of the movable groove 606. A bottom plate 6 is fixedly connected to the top of the partition 607. Two slide rails 601 are fixedly connected to the top of the bottom plate 6. A sliding frame 602 is slidably connected to the surface of the slide rails 601. A transport frame 7 is provided on the top of the sliding frame 602. A motor 603 is fixedly installed at the bottom of the inner wall of container 1. The output end of the motor 603 is connected to a rotating shaft 605 through a transmission box 604. The other end of the rotating shaft 605 is connected to the bottom of the inner wall of container 1 through a bearing seat. The bottom plate 6 is installed on the outer surface of the rotating shaft 605. An inner box 4 is fixedly connected to the top of the bottom plate 6. A mounting frame 5 is fixedly connected to the front of the top of the bottom plate 6. A fixed frame 502 is fixedly connected, and a telescopic frame 503 is movably connected to the top of the fixed frame 502. A fixed frame 504 is movably connected to the top of the telescopic frame 503. Fixed magnets 505 are fixedly connected to both ends of the fixed frame 504. The mounting frame 5 is connected to the upper surface of the base plate 6 by mounting bolts 501. A fixed frame 401 is fixedly installed on the back of the inner wall of the container 1. A gas cylinder 402 is installed inside the fixed frame 401. A flow meter 403 and a vent valve 404 are connected to the output end of the gas cylinder 402. A gas mixing box 405 is also installed inside the container 1. A vent pipe 406 extending into the inner box 4 is fixedly connected to the front of the gas mixing box 405. An air inlet pipe 407 extending to the outside is fixedly connected to the back of the gas mixing box 405. One-way valves are installed on both the air inlet pipe 407 and the vent pipe 406. The gas mixing chamber 405 is equipped with an O2 / CO2 concentration sensor, an industrial-grade STM32H7 microcontroller, and two miniature air pumps. These two pumps control the gas intake and exhaust of the mixing chamber 405, with one input connected to the intake pipe 407 and the other output connected to the ventilation pipe 406. The input of the latter is connected to the output of an oxygen cylinder 402. The inner chamber 4 consists of four panels: an iron top, steel sides, and a steel back. The remaining materials of the container 1 in this application are all carbon steel.

[0029] Fixed plates 702 are fixedly connected to the four corners of the inner wall of the transport frame 7. The top of the fixed plates 702 is connected to a silicone rubber membrane ventilation plate 701 through a rubber pad 703. The silicone rubber membrane ventilation plate 701 allows ventilation through retractable ventilation holes. The diameter of the retractable ventilation holes is adjustable from 0.1 to 0.3 mm. The diameter can be changed according to the breathing intensity of the vegetables in the cavity. Ventilation holes 704 are opened on the side of the transport frame 7, which can also be used for handling the transport frame 7. The transport frames 7 can be stacked.

[0030] Example 1:

[0031] When transporting vegetables by land, container 1 is placed on a truck, with its bottom directly in contact with the truck. A servo motor 603 is activated to control the rotation angle of shaft 605. The output shaft of motor 603 drives shaft 605 to rotate via the transmission structure inside transmission box 604, causing the bottom plate 6 to rotate and tilt to the right within the movable slot. The transport frames 7 containing vegetables are then stacked on the sliding frame 602. Under gravity, the sliding frame 602 causes the transport frames 7 to slide to the right, facilitating their entry into the inner container 4 and reducing manual pushing. After all transport frames 7 are in place, the second fixing frame 504 can be pulled upwards, causing the telescopic frame 503 to extend, allowing the fixing magnets 505 at both ends to... The container is fixed to the iron plate on top of the inner box 4. Then, the motor 603 reverses, causing the base plate 6 to rotate in the opposite direction by a certain angle, making the base plate 6 horizontal. The telescopic frame 503 can prevent the transport frame 7 from slipping during transportation. During transportation, the composition of the mixed gas can be detected inside the gas mixing box 405. Oxygen from the cylinder 402 is drawn in through a micro air pump. After air is drawn in from the outside, it is mixed inside the gas mixing box 405 to achieve an ideal environment of 3%-5% O2 and 5%-8% CO2. Then, it is transported to the inside of the inner box 4 through the ventilation pipe 406. The vegetables inside the transport frame 7 are kept ventilated through the ventilation holes 704. During transportation, the ideal environment of gas can enter the inside of the transport frame 7 through the silicone rubber membrane ventilation plate 701, improving the modified atmosphere preservation effect.

[0032] Example 2:

[0033] During maritime transport, due to the long transport time, the oxygen and carbon dioxide content inside the inner container 4 can be appropriately reduced to meet the breathing requirements of long-distance travel. A ventilation slot 804 is provided at the bottom of the container 1, connecting the inner container 4 and the container 1. An air intake box 805 is installed at the bottom of the ventilation slot 804. Both ends of the ventilation slot 804 extend to the outside of the container 1. Telescopic airbags 8 are installed at both ends of the ventilation slot 804. The telescopic airbag 8 is convex on one side. A compression spring 801 is fixedly connected to one end of the inner wall of the telescopic airbag 8, and a piezoelectric ceramic plate 802 is fixedly connected to the other end of the inner wall of the telescopic airbag 8. 02 is connected to the compression spring 801. An electromagnetic plate 803 is fixedly connected to the outer surface of the telescopic airbag 8. An inverter 806 and a permanent magnet plate 807 are fixedly installed inside the air intake box 805. A fixing plate 809 is fixedly connected to the permanent magnet plate 807 through a telescopic spring 808. The fixing plate 809 is fixedly connected to the inner wall of the ventilation slot 804. A baffle 810 is fixedly connected to the bottom of the permanent magnet plate 807. The lower surface of the baffle 810 is slidably connected to the lower surface of the ventilation slot 804. The permanent magnet plate 807 is coupled to the piezoelectric ceramic plate 802 through the inverter 806. When the air outside the container 1 flows, according to Bernoulli's principle, when flowing at the same height, the greater the flow velocity, the greater the pressure. The smaller the pressure, the faster the airflow velocity on one side of the telescopic airbag 8, resulting in lower pressure on that side. Consequently, the pressure on one side of the telescopic airbag 8 is less than the pressure on the other side, causing the telescopic airbag 8 to bulge under the pressure. This causes the compression spring 801 to separate from the piezoelectric ceramic plate 802. Furthermore, due to the varying airflow velocity during container 1's transport, the telescopic airbag 8 continuously bulges and contracts under pressure and its own elasticity, causing the compression spring 801 to continuously collide with the piezoelectric ceramic plate 802. This generates a current in the piezoelectric ceramic plate 802, which is electrically connected to the electromagnetic plate 803. Because the magnetic field direction of the electromagnetic plate 803 is... The direction of the current is related to the direction of the current. The piezoelectric ceramic plate 802 converts the generated current into alternating current through the inverter, so that the direction of the current on the electromagnetic plate 803 changes periodically. As a result, the electromagnetic plate 803 periodically attracts and repels the permanent magnet plate 807. Under the periodic attraction and repulsion of the electromagnetic plate 803, the permanent magnet plate 807 slides inside the ventilation slot 804 and squeezes the telescopic spring 808. During the movement, the permanent magnet plate 807 drives the baffle 810 to move, so that the outside air can periodically enter the ventilation slot 804 and eventually enter between the inner box 4 and the container 1, thus maintaining continuous air circulation.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vegetable preservation and transportation device, comprising a container (1), a door (2), an inner body (4), a bottom plate (6), a transport frame (7), a gas supply assembly, and an automatic ventilation assembly, characterized in that: The container (1) has a hinged door (2) on the front, an inner box (4) inside, and a rotatable bottom plate (6) at the bottom. A transport frame (7) and a gas supply component are installed on the bottom plate (6). The bottom of the container (1) is connected to an automatic ventilation component. The gas supply component is used to supply fresh-keeping mixed gas to the inner box (4). The automatic ventilation component uses airflow and piezoelectric effect to realize the external air circulation of the inner box (4).

2. The vegetable preservation and transportation device according to claim 1, characterized in that: The container (1) has a movable slot (606) at the bottom, a partition (607) is fixed inside the movable slot (606), a bottom plate (6) is connected above the partition (607), a motor (603) is installed at the bottom of the inner wall of the container (1), the motor (603) is connected to a rotating shaft (605) via a transmission box (604), the rotating shaft (605) is fixed to the bottom plate (6), and drives the bottom plate (6) to rotate horizontally or tilted.

3. The vegetable preservation and transportation device according to claim 2, characterized in that: The bottom plate (6) is provided with a slide rail (601) at the top, and a slide frame (602) is slidably connected on the slide rail (601). The transport frame (7) is placed on the slide frame (602). The bottom plate (6) is also provided with an installation frame (5) at the top. The installation frame (5) is connected to a fixed magnetic block (505) through a fixed frame one (502), a telescopic frame (503), and a fixed frame two (504). The fixed magnetic block (505) adsorbs the iron plate at the top of the inner box (4) to achieve the limit.

4. The vegetable preservation and transportation device according to claim 1, characterized in that: The gas supply assembly includes a mounting bracket (401), a gas cylinder (402), a flow meter (403), a vent valve (404), a gas mixing chamber (405), a vent pipe (406), and an inlet pipe (407). The mounting bracket (401) is installed on the inner wall of the container (1). The gas cylinder (402) is placed inside the mounting bracket (401). The gas cylinder (402) is connected in sequence to the flow meter (403), the vent valve (404), and the gas mixing chamber (405). The gas mixing chamber (405) has a vent pipe (406) extending into the inner chamber (4) on the front and an inlet pipe (407) extending to the outside on the back. Both the vent pipe (406) and the inlet pipe (407) are equipped with one-way valves.

5. A vegetable preservation and transportation device according to claim 4, characterized in that: The gas mixing chamber (405) is equipped with an O2 / CO2 concentration sensor, an STM32H7 microcontroller and two micro air pumps, which can mix oxygen and air into an ideal state of preservation gas and send it into the inner chamber (4).

6. The vegetable preservation and transportation device according to claim 1, characterized in that: The transport frame (7) has a fixing plate (702) at the four corners of its inner wall. The fixing plate (702) is connected to the silicone rubber membrane breathable plate (701) via a rubber pad (703). The silicone rubber membrane breathable plate (701) has adjustable telescopic breathable holes. The transport frame (7) has a breathable hole (704) on its side and can be stacked.

7. A vegetable preservation and transportation device according to claim 1, characterized in that: The automatic ventilation assembly includes a ventilation slot (804), an air inlet box (805), a telescopic airbag (8), a piezoelectric ceramic plate (802), a compression spring (801), an electromagnetic plate (803), an inverter (806), a permanent magnet plate (807), a telescopic spring (808), and a baffle (810). The ventilation slot (804) connects the bottom of the container (1) to the outside of the inner box (4), and telescopic airbags (8) are provided at both ends. The inner wall of the telescopic airbag (8) is connected to the compression spring (801) and the piezoelectric ceramic plate (802). The ceramic plate (802) has an externally fixed electromagnetic plate (803). The air intake box (805) has an internal inverter (806) and a permanent magnet plate (807). The permanent magnet plate (807) is fixed by a telescopic spring (808) and connected to a sliding baffle (810) at the bottom. The piezoelectric ceramic plate (802) is electrically connected to the electromagnetic plate (803) via the inverter (806). The airflow drives the telescopic airbag (8) to deform and generate electricity, controlling the reciprocating motion of the permanent magnet plate (807) and the baffle (810) to achieve ventilation.

8. A vegetable preservation and transportation device according to claim 7, characterized in that: The telescopic airbag (8) repeatedly bulges and contracts under the pressure difference of the external airflow, which drives the compression spring (801) to strike the piezoelectric ceramic plate (802) to generate current. The current is converted into alternating current by the inverter (806), which causes the electromagnetic plate (803) to periodically attract and repel the permanent magnet plate (807), driving the baffle (810) to open and close, so that air can periodically enter the outside of the inner box (4).

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