Cold-chain logistics transportation box for fruits and vegetables

Abstract

The invention relates to the technical field of cold-chain transportation, and discloses a fruit and vegetable cold-chain logistics transportation box which comprises a plurality of self-adaptive transportation boxes arranged in a stacked mode, the self-adaptive transportation boxes serve as storage devices of fruits and vegetables, and left-right symmetrical closed storage cavities capable of being opened and closed are formed in the self-adaptive transportation boxes; the central circulation channel vertically penetrates through the center of the self-adaptive transportation box and serves as an external cold air circulation channel, and a gas flow guide part is arranged in the central circulation channel; according to the device, the dual-mode intelligent switching arrangement is adopted, an external cold source (such as cold air of a refrigerator car) is preferentially utilized, the cold air is efficiently distributed through the central circulation channel and the flow guide system, and the energy consumption of an internal refrigerator is reduced; the internal circulation mode is automatically switched only when external cold air is insufficient, energy waste is remarkably reduced, the brushless direct-current flow guide fan is dynamically started and stopped according to temperature data, the problem of high power consumption caused by continuous operation is avoided, and the energy-saving air conditioner has the advantages of being high in practicability and saving energy.

Description

Technical Field

[0001] The present invention relates to the technical field of cold chain transportation, and in particular to a cold chain logistics transportation box for fruits and vegetables. Background Art

[0002] High fruit and vegetable spoilage rates in post-harvest distribution remain a persistent pain point in the global agricultural sector. According to statistics, in developing countries, imperfect cold chain facilities lead to fruit and vegetable spoilage rates as high as 30%-50%, severely restricting industrial profitability. As core equipment connecting production areas with consumer markets, cold chain transport boxes must simultaneously meet multiple requirements, including precise temperature control, atmospheric conditioning, and physical protection. While traditional technologies can delay spoilage to a certain extent, they suffer from significant deficiencies in energy efficiency, temperature uniformity, and gas management efficiency, making them unable to meet the demands of modern logistics for low-carbon, intelligent logistics.

[0003] Existing cold chain transportation technology categories and limitations: Mechanically refrigerated refrigerated boxes: These utilize a compressor refrigeration system that forces cooling through refrigerant circulation. While these devices can achieve a wide temperature range of -20°C to 15°C, they have significant drawbacks: Excessive energy consumption: The compressor must run continuously to maintain low temperatures, consuming significantly more energy in high-temperature environments, placing a heavy load on the vehicle's power supply system and making them unsuitable for passive transportation. Poor temperature uniformity: Cold air is typically delivered to the box from a single direction, creating a "cold near, hot far" temperature gradient that can lead to localized frostbite or heat accumulation and rot in fruits and vegetables. Complex maintenance: The risk of refrigerant leakage is high, and the need for regular refilling of Freon-based media goes against environmental policy trends. Phase change material (PCM) insulated boxes: These utilize the latent heat properties of phase change materials such as paraffin and fatty acids to buffer temperature fluctuations. Although its passive temperature control mechanism can reduce energy consumption, it has fundamental defects: low temperature control accuracy: the PCM phase change temperature range is fixed (usually 2°C-5°C), which cannot adapt to the optimal storage temperature requirements of different fruits and vegetables (such as bananas need 12°C, strawberries need 0°C); no active cooling capacity: once the external ambient temperature exceeds the PCM buffer threshold, the temperature inside the box will quickly get out of control, and it is only suitable for short-distance transportation. 、 Concentrations inhibit the respiration of fruits and vegetables. Existing technologies often rely on external gas cylinders or chemical adsorbents, resulting in: Lag in gas control: There's a time lag between sensor feedback and gas release, resulting in large fluctuations in gas concentration within the box (±5%) and unstable preservation; high energy consumption and costs: Continuous gas conditioning requires an air compressor or molecular sieve equipment, increasing electricity consumption by 20%-30%, and high-purity gas supply costs; and refrigerant-assisted transport boxes: These use refrigerants such as ice packs and dry ice to maintain low temperatures. While this solution is simple in structure, it has significant drawbacks: Severe cooling waste: The centralized placement of refrigerants results in uneven cold distribution, with over 50% of the cooling dissipated through gaps in the box; and uncontrollable temperature: Once the refrigerant melts, it can't replenish the cooling, resulting in a monotonically rising temperature within the box, making it difficult to meet the demands of long-distance transport exceeding 48 hours.

[0004] None of the above technologies have been able to effectively balance the contradiction between energy saving and freshness preservation efficiency: Low energy utilization efficiency: The high power consumption of mechanical refrigeration and gas conditioning equipment, and the passive temperature control mode of PCM and refrigerant all result in energy waste; Poor environmental adaptability: The existing cabinets lack an intelligent switching mechanism and cannot dynamically optimize the operating mode according to external cold source conditions (such as power supply from refrigerated trucks, natural low-temperature environment); Insufficient system integration: Multi-parameter control modules such as temperature, humidity, and gas concentration are independent of each other, making collaborative control difficult, and increasing redundant energy consumption by 30%-40%. Therefore, it is necessary to design an intelligent cold chain transportation device with strong practicality, adaptive energy consumption, and multi-parameter collaborative control. Summary of the Invention

[0005] The object of the present invention is to provide a cold chain logistics transport box for fruits and vegetables to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a fruit and vegetable cold chain logistics transport box, comprising: It includes several stacked adaptive transport boxes as a storage device for fruits and vegetables, with a bilaterally symmetrical, openable and closed storage cavity inside; A central circulation channel, which runs through the center of the adaptive transport box from top to bottom and serves as an external cold air flow channel, and is provided with a gas guide member inside; The external cooling air flow channel is provided in a one-to-one correspondence with the enclosed storage chamber, including a cooling air inlet and a cooling air outlet provided diagonally, and the opening and closing of the cooling air flow channel are controlled by the switch seal 1 and the switch seal 2 respectively; The internal cold air circulation component is provided in a one-to-one correspondence with the sealed storage chamber, and circulates cold air in the sealed storage chamber through autonomous refrigeration to keep fruits and vegetables fresh, and can be switched on and off automatically; A nitrogen auxiliary component is provided in a one-to-one correspondence with the sealed storage chamber, and assists in preserving fruits and vegetables through trace amounts of gas; A sensor group is used to monitor the central circulation channel and the closed storage chamber.

[0007] According to the above technical solution, the adaptive transport box includes: The lightweight box is in the shape of a rectangular parallelepiped. The outer corners are rounded and there are handle slots symmetrically arranged on both sides. The lightweight box cover is symmetrically embedded in the embedding groove 1 at the upper end of the lightweight box body, with the outer wall surface flush with the outer wall surface of the lightweight box body, and is connected to the upper end of the lightweight box body by magnet attraction. A silicone sealing strip is provided on the edge, and a second handle groove is symmetrically opened in the front and back; A leg assembly for facilitating stable stacking of the upper and lower adaptive transport boxes, including: The first leg is symmetrically fixedly mounted at the middle position of the lower end of the lightweight box and is arranged corresponding to the first leg slot symmetrically opened at the upper end of the other lightweight box; The second supporting leg is rectangularly arranged at the lower end of the lightweight box body, and is symmetrically arranged in groups of two, respectively corresponding to the second supporting leg groove symmetrically opened at the upper end of the other lightweight box cover.

[0008] According to the above technical solution, the cold air inlet is composed of evenly distributed air inlets, which are opened below one end of the closed storage chamber adjacent to the central circulation channel and are controlled on and off by the central switch seal 1; Wherein, the switch seal 1 comprises: An electric telescopic cylinder 1 is fixedly installed in a sealing groove 1 at the center of the cold air inlet, and its surface is coated with a nano-hydrophobic coating; A sealing plate 1 is fixedly mounted on the telescopic end of the electric telescopic cylinder 1, and has a side wall with a circulation port 1, which is arranged in a one-to-one correspondence with the air inlet, and the circulation port 1 and the air inlet are both arranged to be inclined upward toward the closed storage chamber; The cold air outlet is composed of evenly distributed air outlets, which are opened above the end of the closed storage chamber away from the central circulation channel and are controlled on and off by the central switch seal 2; Wherein, the switch seal 2 comprises: The second electric telescopic cylinder is fixedly installed in the second sealing groove at the center of the cold air outlet, and the surface of the cylinder is coated with a nano-hydrophobic coating; The second sealing plate is fixedly mounted on the telescopic end of the second electric telescopic cylinder, and has two circulation openings evenly distributed on its side wall, which are arranged in a one-to-one correspondence with the air outlets. Both the second circulation opening and the air outlet are inclined downward toward the enclosed storage chamber. The cold air inlet is composed of evenly distributed air inlets, which are opened below one end of the enclosed storage chamber adjacent to the central circulation channel and are controlled on and off by the central switch seal. Wherein, the switch seal 1 comprises: An electric telescopic cylinder 1 is fixedly installed in a sealing groove 1 at the center of the cold air inlet, and its surface is coated with a nano-hydrophobic coating; A sealing plate 1 is fixedly mounted on the telescopic end of the electric telescopic cylinder 1, and has a side wall with a circulation port 1, which is arranged in a one-to-one correspondence with the air inlet, and the circulation port 1 and the air inlet are both arranged to be inclined upward toward the closed storage chamber; The cold air outlet is composed of evenly distributed air outlets, which are opened above the end of the closed storage chamber away from the central circulation channel and are controlled by the central switch seal 2; Wherein, the switch seal 2 comprises: The second electric telescopic cylinder is fixedly installed in the second sealing groove at the center of the cold air outlet, and the surface of the cylinder is coated with a nano-hydrophobic coating; The second sealing plate is fixedly mounted on the second telescopic end of the electric telescopic cylinder, and the side walls are evenly distributed with second flow openings, which are arranged in one-to-one correspondence with the air outlets. Both the second flow openings and the air outlets are arranged tilted downward toward the closed storage cavity.

[0009] According to the above technical solution, the inner cooling airflow circulation component includes: A refrigerator is fixedly mounted in the second embedding slot at the lower end of the adaptive transport box by bolts to provide cold air supply; A cold air circulation pipe is embedded in the adaptive transport box, with an air extraction end extending to above one end of the enclosed storage chamber adjacent to the central circulation channel, a filter head is fixedly installed at the end, and an air supply end is connected to the air inlet of the refrigerator; A filter plate is detachably mounted on the bottom of the sealed storage chamber, and the bottom forms a cooling zone; The air supply rack is symmetrically arranged in the cooling zone and is formed by a reciprocatingly bent air supply pipe. A plurality of air supply holes are evenly distributed on the upper end. One end is connected to the air outlet of the refrigerator, and the other end is detachably installed with a sealing cover.

[0010] According to the above technical solution, the nitrogen auxiliary component includes: The miniature nitrogen bottle is in a flat square shape and can be detachably installed in the third embedding slot at the lower end of the adaptive transport box through a quick-release part; The nesting frame is formed by a reciprocatingly bent air supply pipe 2, which is coaxially nested in the air supply pipe 1. A gap is left between the air supply pipe 1 and the air supply pipe 2, and is filled with a silicone shock-absorbing pad. A plurality of air supply holes 2 are evenly distributed on the surrounding wall. One end is connected to the miniature nitrogen bottle, and the other end is detachably installed with a sealing cap 2.

[0011] According to the above technical solution, the sensor group includes: temperature sensors one, horizontally and equally spaced within the central flow channel; Temperature sensors 2 are vertically and evenly spaced on the side wall of the sealed storage chamber; The gas concentration sensors are vertically and evenly spaced on the side walls of the sealed storage chamber and are located on both sides of the temperature sensor.

[0012] According to the above technical solution, the gas guide member includes: The guide fan is evenly distributed at equal heights in the central circulation channel to transport the cold air from the bottom to the top. It uses a brushless DC motor and is dynamically started and stopped according to the temperature sensor data to reduce energy consumption. The guide plate is arranged in the central circulation channel in an inverted cone shape to guide the cold air into the cold air inlet.

[0013] According to the above technical solution, the peripheral wall of the sealed storage cavity includes: The outer layer is made of high-strength PP or ABS plastic to provide structural support; The middle layer uses PCM packaging units to evenly distribute the heat buffer function; The inner layer uses a food-grade thermal conductive mesh plate with circulation holes evenly distributed on it to promote heat exchange between cold air and PCM.

[0014] According to the above technical solution, the quick-release parts include: A movable plate is symmetrically arranged in the movable groove at the lower end of the adaptive transport box; A spring is evenly distributed at one end of the movable plate to provide elastic restoring force for the movable plate; A plug-in board, one end of which is fixedly mounted on one end of the movable board, and the other end of which is plugged into the side wall of the miniature nitrogen bottle to play a fixing role; A quick-release rod is fixedly mounted on the outer side of the movable plate, with an end thereof exposed from the lower wall of the adaptive transport box.

[0015] According to the above technical solution, a central control display screen is embedded in the front end of the adaptive transport box, and the central control display screen displays the dynamic curves of temperature, humidity and gas concentration collected by the sensor group in real time. Control buttons are arranged at the lower end of the central control display screen.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) Energy saving and high efficiency, reducing transportation costs: dual-mode intelligent switching setting, giving priority to the use of external cold sources (such as cold air from refrigerated trucks), efficiently distributing cold air through the central circulation channel and diversion system, reducing the energy consumption of the internal refrigeration machine; automatically switching to the internal circulation mode only when the external cold air is insufficient, significantly reducing energy waste, the brushless DC diversion fan dynamically starts and stops according to temperature data, avoiding the problem of high power consumption during continuous operation, and the PCM phase change material layer reduces temperature fluctuations through phase change buffering, reducing the compensation energy consumption of the refrigeration system; (2) Excellent preservation effect, extending the shelf life of fruits and vegetables: Nitrogen and cold air work together to preserve freshness. Nitrogen auxiliary components independently release high-purity nitrogen through nested pipes, inhibiting the respiration of fruits and vegetables, delaying ripening and corruption. Cold air circulation (external cold diagonal circulation / inner cold vertical circulation) ensures temperature uniformity and avoids local overheating or frostbite. The three-layer composite cavity wall structure: the outer layer (PP / ABS) is impact-resistant, the middle layer (PCM) buffers temperature fluctuations, and the inner layer of the temperature-conducting grid plate accelerates heat exchange between the cold air and PCM, maintaining a constant temperature environment in the cavity (±0.5°C); (3) Modular structural design to improve transportation efficiency: adopting a stacked stable structure, the leg group realizes stable stacking of multiple boxes through concave and convex fitting (leg 1 and leg slot 1, leg 2 and leg slot 2), which meets the needs of high-density transportation and improves space utilization by more than 30%. The lightweight box body is made of PP / ABS material with rounded corners to reduce transportation weight and collision damage risk. Through the quick-release component design, the micro nitrogen bottle can be replaced within 5 seconds. The plug-in board and L-shaped buckle design simplify the maintenance process. (4) Intelligent monitoring and dynamic control: adopt multi-sensor closed-loop control, temperature sensor monitors internal and external temperature in real time, gas concentration sensor tracks The central control screen dynamically displays temperature and humidity curves and gas concentrations, supports threshold over-limit alarms (audio and visual prompts) and remote monitoring (Bluetooth / Wi-Fi), reducing the need for manual inspections. It automatically optimizes the operating mode according to the transportation environment (such as day and night temperature differences and cold source stability), reducing the risk of human error. (5) Easy maintenance and long service life: Through the detachable cleaning design, the filter plate and air supply hole support quick disassembly and cleaning to avoid clogging by fruit and vegetable residues. The nano-hydrophobic coating is applied to the surface of the switch seal to prevent condensed water from freezing and causing mechanical jamming, extending the life of the electric telescopic cylinder. The refrigerator is independently embedded and installed, and can be replaced separately in case of failure, reducing maintenance costs. (6) Wide applicability and economic benefits: It is suitable for high value-added scenarios such as short-distance delivery of fresh food e-commerce, cross-border cold chain shipping, and long-distance transportation of agricultural products. By extending the shelf life of fruits and vegetables (about 15-30%), reducing the loss rate, and energy-saving design, it reduces transportation costs by about 20%, shortening the investment return cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a first perspective schematic diagram of the present invention; Figure 2 is a second perspective schematic diagram of the present invention; Figure 3is a third perspective schematic diagram of the present invention; Figure 4 is a first partial perspective schematic diagram of the present invention; Figure 5 is a second partial perspective schematic diagram of the present invention; Figure 6 is a third partial perspective schematic diagram of the present invention; Figure 7 is a fourth partial perspective schematic diagram of the present invention; Figure 8 is a fifth partial perspective schematic diagram of the present invention; Figure 9 is a sixth partial perspective schematic diagram of the present invention; Figure 10 is a seventh partial perspective schematic diagram of the present invention; In the figure: 1-adaptive transport box, 11-lightweight box body, 111-handle slot 1, 112-embedded slot 1, 113-leg slot 1, 114-leg slot 2, 115-embedded slot 2, 116-embedded slot 3, 12-lightweight box cover, 121-silicone sealing strip, 122-handle slot 2, 13-leg group, 131-leg 1, 132-leg 2, 14-magnet, 15-central control display, 16-control button, 2-sealed storage chamber, 21-outer layer, 22-middle layer, 23-inner layer, 231-circulation hole, 3-central circulation channel, 4-gas guide, 41-guide fan, 42-guide plate, 5-external cooling air flow channel, 51-cold air inlet, 511-sealing slot 1, 52-cold air outlet, 521-sealing slot 2 , 53-Switch seal 1, 531-Electric telescopic cylinder 1, 532-Sealing plate 1, 5321-Flow port 1, 54-Switch seal 2, 541-Electric telescopic cylinder 2, 542-Sealing plate 2, 5421-Flow port 2, 6-Internal cold air circulation component, 61-Refrigerator, 62-Cold air circulation pipe, 63-Filter head, 64-Filter plate, 65-Air supply rack, 651-Air supply hole 1, 66-Sealing cover 1, 7-Nitrogen auxiliary component, 71-Miniature nitrogen bottle, 72-Nesting rack, 721-Air supply hole 2, 73-Sealing cover 2, 8-Sensor group, 81-Temperature sensor 1, 82-Temperature sensor 2, 83-Gas concentration sensor, 9-Quick release component, 91-Movable plate, 92-Spring, 93-Plug-in plate, 94-Quick release rod. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-10 The present invention provides a technical solution: a fruit and vegetable cold chain logistics transport box, comprising: It includes a plurality of stacked adaptive transport boxes 1, which serve as a storage device for fruits and vegetables, and has a bilaterally symmetrical, openable and closed storage cavity 2 inside. A central circulation channel 3 runs through the center of the adaptive transport box 1 vertically and serves as an external cold air flow channel, and a gas guide 4 is provided inside; The external cooling air flow channel 5 is provided in a one-to-one correspondence with the sealed storage chamber 2, and includes a cooling air inlet 51 and a cooling air outlet 52 provided diagonally, which are respectively controlled to be on and off by a switch seal 1 53 and a switch seal 2 54; The internal cold air circulation member 6 is provided in one-to-one correspondence with the sealed storage chamber 2, and circulates cold air in the sealed storage chamber 2 through autonomous refrigeration to keep fruits and vegetables fresh, and can be switched on and off automatically; A nitrogen auxiliary component 7 is provided in a one-to-one correspondence with the sealed storage chamber 2 to assist in preserving fruits and vegetables through trace amounts of gas; a sensor group 8 for monitoring the central circulation channel 3 and the sealed storage chamber 2; Specifically, the adaptive transport box 1 includes: The lightweight box body 11 is in the shape of a rectangular parallelepiped as a whole, with rounded corners on the outer wall and handle grooves 111 symmetrically provided on the left and right sides; The lightweight box cover 12 is symmetrically embedded in the embedding groove 112 at the upper end of the lightweight box body 11, with the outer wall surface flush with the outer wall surface of the lightweight box body 11. It is connected to the upper end of the lightweight box body 11 by attraction through the magnet 14. A silicone sealing strip 121 is provided on the edge, and a second handle groove 122 is symmetrically opened in the front and back; The support leg group 13 facilitates the stable stacking of the upper and lower adaptive transport boxes 1, and includes: A support leg 131 is symmetrically fixedly mounted at the middle position of the lower end of the lightweight box 11, and is correspondingly arranged with a support leg slot 113 symmetrically opened at the upper end of the other lightweight box 11; The second legs 132 are rectangular and arranged at the lower end of the lightweight box body 11, and are symmetrically arranged in groups of two, respectively corresponding to the second leg slots 114 symmetrically opened at the upper end of the other lightweight box cover 12; Specifically, the cold air inlet 51 is composed of uniformly distributed air inlets, which are opened below one end of the closed storage chamber 2 adjacent to the central circulation channel 3 and are controlled on and off by the central switch seal 53; Wherein, the switch seal 53 includes: An electric telescopic cylinder 531 is fixedly installed in a sealing groove 511 at the center of the cold air inlet 51 and is coated with a nano-hydrophobic coating; A sealing plate 532 is fixedly mounted on the telescopic end of the electric telescopic cylinder 531, and has circulation openings 5321 distributed uniformly on its sidewalls, corresponding one-to-one with the air inlets. Both the circulation openings 5321 and the air inlets are arranged obliquely upward toward the sealed storage chamber 2; The cold air outlet 52 is composed of evenly distributed air outlets, which are opened above the end of the sealed storage chamber 2 away from the central circulation channel 3 and are controlled on and off by the central switch seal 2 54; Wherein, the switch seal 2 54 comprises: The second electric telescopic cylinder 541 is fixedly installed in the second sealing groove 521 at the center of the cold air outlet 52, and the surface is coated with a nano-hydrophobic coating; The second sealing plate 542 is fixedly mounted on the telescopic end of the second electric telescopic cylinder 541, and has second circulation openings 5421 distributed on its sidewalls, corresponding one-to-one with the air outlets. Both the second circulation openings 5421 and the air outlets are arranged obliquely downward toward the sealed storage chamber 2; Specifically, the inner cooling airflow circulation component 6 includes: The refrigerator 61 is fixedly mounted in the second embedding slot 115 at the lower end of the adaptive transport box 1 by bolts to provide cold air supply; The cold air circulation pipe 62 is embedded in the adaptive transport box 1, with the air extraction end extending to the upper end of the closed storage chamber 2 adjacent to the central circulation channel 3, and a filter head 63 is fixedly installed at the end, and the air supply end is connected to the air inlet of the refrigerator 61; The filter plate 64 is detachably mounted on the bottom of the sealed storage chamber 2, and the bottom forms a cooling zone; An air supply rack 65 is symmetrically arranged in the cooling zone and is formed by a reciprocatingly bent air supply pipe. A plurality of air supply holes 651 are evenly distributed on the upper end. One end is connected to the air outlet of the refrigerator 61, and the other end is detachably mounted with a sealing cap 66. Specifically, the nitrogen auxiliary component 7 includes: The miniature nitrogen bottle 71 is in a flat square shape and can be detachably mounted in the third embedding slot 116 at the lower end of the adaptive transport box 1 via a quick-release member 9; The nesting frame 72 is formed by a reciprocatingly bent air supply tube 2, coaxially nested within the air supply tube 1, with a gap between the air supply tubes 1 and 2 filled with a silicone shock-absorbing pad. A plurality of air supply holes 721 are evenly distributed on the surrounding wall. One end is connected to the miniature nitrogen bottle 71, and the other end is detachably mounted with a sealing cap 73. Specifically, the sensor group 8 includes: Temperature sensors 81 are horizontally and evenly spaced within the central flow channel 3; Temperature sensors 82 are vertically and evenly spaced on the side wall of the sealed storage chamber 2; Gas concentration sensors 83 are vertically and evenly spaced on the side wall of the sealed storage chamber 2 and are located next to the second temperature sensor 82; Specifically, the gas guide member 4 includes: The guide fans 41 are evenly distributed at equal heights in the central circulation channel 3 to transport the cold air from the bottom to the top. They use brushless DC motors and are dynamically started and stopped according to temperature sensor data to reduce energy consumption. The guide plate 42 is arranged in an inverted cone shape in the central circulation channel 3 to guide the cold air into the cold air inlet 51; Specifically, the surrounding wall of the sealed storage chamber 2 includes: The outer layer 21 is made of high-strength PP or ABS plastic to provide structural support; The middle layer 22 uses PCM packaging units to evenly distribute the heat buffer function; The inner layer 23 is made of a food-grade heat-conducting mesh plate with circulation holes 231 evenly distributed on it to promote heat exchange between cold air and PCM; Specifically, the quick-release part 9 includes: The movable plate 91 is symmetrically arranged in the movable groove at the lower end of the adaptive transport box 1; The spring 92 is evenly distributed at one end of the movable plate 91 to provide elastic restoring force for the movable plate 91; The plug-in board 93 has one end fixedly mounted on one end of the movable board 91 and the other end plugged into the side wall of the miniature nitrogen bottle 71 to play a fixing role; A quick-release rod 94 is fixedly mounted on the outside of the movable plate 91, with its end exposed to the lower wall of the adaptive transport box 1; Specifically, a central control display screen 15 is embedded in the front end of the adaptive transport box 1, and the central control display screen 15 displays the dynamic curves of temperature, humidity and gas concentration collected by the sensor group 8 in real time. Control buttons 16 are distributed at the lower end of the central control display screen 15.

[0020] Working Principle: This device achieves efficient preservation of fruits and vegetables during transportation through the coordinated control of external cold air intake and internal autonomous refrigeration, combined with nitrogen preservation and an intelligent temperature control system. Its core logic prioritizes the use of external cold sources (such as air from a refrigerated truck) to deliver cold air to each sealed storage chamber 2 via a central circulation channel 3, reducing energy consumption. When external cold air is insufficient (temperature exceeds a threshold), the system switches to an internal refrigeration cycle, supplemented by nitrogen to suppress fruit and vegetable respiration. Sensor group 8 monitors temperature, humidity, and gas concentration in real time, dynamically adjusting the refrigeration mode and nitrogen release rate to form a closed-loop control system.

[0021] The following is a functional analysis of the core components: Lightweight box 11 and box cover 12: Made of high-strength PP / ABS plastic, with rounded corners to reduce collision damage, magnetic seals (magnets 14 + silicone sealing strips 121) ensure airtightness, leg group 13: Leg one 131 and leg two 132 achieve multi-layer stacking stability through concave-convex interlocking (leg slot one 113, leg slot two 114), prevent misalignment caused by transportation bumps, provide modular stacking transportation capabilities, optimize space utilization, and at the same time ensure the sealing and structural strength of the lightweight box 11, cold air enters from the bottom of the central circulation channel 3 in the middle of the lightweight box 11, and the vertically stacked adaptive transport box 1 forms a complete gas circulation channel to circulate the cold air and guide it through the gas guide 4 to accelerate the circulation of the cold air, and at the same time guide the cold air through the external cold air flow channel 5 to the closed storage chamber 2, and cool the fruits and vegetables through the cold air of the vehicle body, circulation port one 532 1 is consistent with the number and size of the air inlet, and when the circulation port 5321 completely covers the air inlet, the cold air inlet 51 is closed. When the electric telescopic cylinder 531 contracts, the circulation port 5321 of the sealing plate 532 is misaligned with the air inlet 51 to achieve complete sealing. When extended, the circulation port 5321 is aligned with the air inlet 51, and the cold air tilts upward into the closed storage chamber 2. The electric telescopic cylinder (531 / 541) drives the sealing plate (532 / 542) to slide, and the circulation port (5321 / 5421) is aligned or misaligned with the air inlet / outlet to control the cold air on and off, efficiently utilize the external cold source, and reduce the internal refrigeration energy consumption. When the external cold air is insufficient, the external cold air flow channel 5 Close, the external cold air circulation part 6 is opened, the cooling zone is located below the filter plate 64, the air supply rack 65 is installed horizontally in the cooling zone, the air supply hole 1 651 is upwardly aligned with the filter plate 64, the refrigerator 61 has a built-in compressor and a centrifugal fan, and the cold air circulation is driven by the centrifugal fan to provide a backup cold source. The cold air circulation path: refrigerator 61, air supply rack 65, filter plate 64, closed storage chamber 2, cold air circulation pipe 62 and refrigerator 61 form a closed loop, the filter head 63 and filter plate 64 intercept fruit and vegetable debris to prevent clogging of the air supply hole 1 651, autonomous refrigeration ensures continuous preservation when the external cold source fails, the circulation system reduces cold waste, air supply pipe 1 delivers cold air, and air supply pipe 2 delivers nitrogen. Both are released into the sealed storage chamber 2 through the air supply hole 1 651 and the air supply hole 2 721 respectively. The air supply pipe 2 (nitrogen) is nested in the air supply pipe 1 (cold air). The two are transported independently and released to the bottom of the chamber through the air supply hole 2 721. The silicone shock-absorbing pad cushions the impact of transportation vibration on the pipeline. Nitrogen inhibits the respiration of fruits and vegetables, delays ripening, and cooperates with the cold air to extend the shelf life. The temperature sensor 1 81 monitors the cold air temperature of the central circulation channel 3 to determine whether the external cold source is sufficient. The temperature sensor 2 82 and the gas concentration sensor 83 monitor the internal environment of each sealed storage chamber 2 and feedback to the controller to adjust the refrigeration / nitrogen release, providing real-time data support, triggering mode switching and nitrogen release.The sealed storage chamber 2 has a wall structure that runs from the outside in. The outer layer 21 is made of PP / ABS plastic to provide impact resistance. The middle layer 22 uses PCM phase change material (e.g., paraffin-based, with a phase change temperature of 2°C-8°C) to absorb and release heat and buffer temperature fluctuations. It supports different types of PCM modules, allowing users to select the appropriate PCM based on different transportation needs. The inner layer 23 uses a thermally conductive mesh plate (uniformly distributed flow holes 231) to accelerate heat exchange between the cold air and the PCM, maintaining a constant temperature in the chamber. The three-layer composite structure balances insulation and thermal buffering, making it suitable for long-distance transportation environments.

[0022] Detailed workflow description 1. Initial Preparation Phase Loading fruits and vegetables: Open the lightweight box cover 12, place the fruits and vegetables in layers into the sealed storage chamber 2 to avoid over-stacked storage that would obstruct airflow, close the box cover 12, the magnet 14 seals the box, and the silicone sealing strip 121 ensures airtightness.

[0023] Stacking transport boxes: Multiple adaptive transport boxes 1 are stacked up and down through the leg group 13, with leg one 131 embedded in leg slot one 113 of the upper box body, and leg two 132 embedded in leg slot two 114 to ensure stability.

[0024] 2. Transport phase: dynamic switching of dual modes 1. Mode 1: External cooling airflow dominant mode prioritizes energy saving Trigger condition: the sensor group 8 detects that the temperature of the central circulation channel 3 is less than or equal to a set threshold.

[0025] Workflow: Cold air introduction: The guide fan 41 is started to draw the external cold air from the bottom to the top of the central circulation channel 3, and the inverted cone-shaped guide plate 42 evenly distributes the cold air to each cold air inlet 51.

[0026] External cooling cycle: the switch seal 53 is opened: the electric telescopic cylinder 531 is extended, the flow opening 5321 of the sealing plate 532 is aligned with the air inlet, and the cold air enters the closed storage chamber 2 obliquely upward.

[0027] The switch seal 2 54 is opened: the electric telescopic cylinder 2 541 is extended, the flow opening 2 5421 of the sealing plate 2 542 is aligned with the air outlet, and the hot air is discharged upward from the top of the cavity.

[0028] Forming diagonal circulating airflow: cold air enters from the lower end of the central circulation channel 3 of the cavity and is discharged from the upper ends of both sides of the box, evenly covering the fruits and vegetables.

[0029] Nitrogen assist: The micro nitrogen bottle 71 releases a small amount of nitrogen through the air supply hole 721 of the nesting rack 72, and the concentration is maintained at 90-95%, which inhibits the respiration of fruits and vegetables.

[0030] Monitoring and regulation: Temperature sensor 82 monitors the cavity temperature in real time, and gas concentration sensor 83 monitors Concentration, data is synchronized to the central control display screen 15.

[0031] 2. Mode 2: Internal cooling cycle mode (when external cooling source is insufficient or when loading and unloading cargo) Trigger condition: Central circulation channel 3 temperature > set threshold, such as 5°C, or external cooling air supply is interrupted.

[0032] Workflow: Mode switching: Data linkage closes the external cooling airflow channel 5, opens the internal cooling airflow circulation component 6, starts the refrigerator 61, and the compressor cools.

[0033] Internal cooling cycle: The cold air circulation pipe 62 draws air from the top of the cavity → cools it through the refrigerator 61 → sends it to the bottom of the cavity through the air supply hole 651 of the air supply rack 65. The cold air rises after being purified by the filter plate 64, forming a bottom-up cycle to avoid local temperature differences.

[0034] Nitrogen enhanced release: gas concentration sensor 83 detects When the concentration increases, the nitrogen release amount will be automatically increased to 95-98%.

[0035] Continuous monitoring: If the temperature sensor 2 82 detects that the cavity temperature has returned to within the threshold, it will automatically switch back to the external cooling mode.

[0036] 3. Exception handling stage Nitrogen cylinder replacement: Press the quick-release lever 94, the spring 92 is compressed, the plug-in plate 93 is separated from the groove of the nitrogen bottle 71, and the quick-release part 9 is reset after replacing a new bottle.

[0037] Refrigeration failure: If the refrigerator 61 fails, the central control screen 15 displays a fault code, starts the backup power supply or notifies manual intervention.

[0038] 4. Unloading and maintenance stage Termination of refrigeration: Turn off the refrigerator 61 and the external cold source, and reset the switch seal to the closed state.

[0039] Unloading operation: open the box cover 12, take out the fruits and vegetables, and clean the filter plate 64 and the air supply holes 651 / 721.

[0040] Equipment maintenance: Check the thermal buffer performance of the middle layer 22 of the PCM packaging unit, replenish phase change material if necessary, and calibrate the data accuracy of the sensor 8 to ensure reliable operation in the next cycle.

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fruit and vegetable cold chain logistics transport box, characterized by: include: It comprises a plurality of stacked adaptive transport boxes (1) as a storage device for fruits and vegetables, and has a bilaterally symmetrical, openable and closed storage cavity (2) inside. A central circulation channel (3) runs through the center of the adaptive transport box (1) from top to bottom, serving as an external cold air flow channel, and having a gas guide member (4) disposed therein; The external cooling air flow channel (5) is provided in a one-to-one correspondence with the sealed storage chamber (2), and includes a cooling air inlet (51) and a cooling air outlet (52) provided diagonally opposite to each other, and is controlled to be on and off by a switch seal 1 (53) and a switch seal 2 (54), respectively; An internal cold air circulation component (6) is provided in one-to-one correspondence with the sealed storage chamber (2), and performs cold air circulation in the sealed storage chamber (2) through autonomous refrigeration to preserve the fruits and vegetables, and can be switched on and off automatically; A nitrogen auxiliary component (7) is provided in one-to-one correspondence with the sealed storage chamber (2) to assist in preserving fruits and vegetables through trace amounts of gas; A sensor group (8) is used to monitor the central circulation channel (3) and the sealed storage chamber (2).

2. The fruit and vegetable cold chain logistics transport box according to claim 1, characterized in that: The adaptive transport box (1) comprises: The lightweight box (11) is in the shape of a rectangular parallelepiped as a whole, with the outer wall corners all being rounded, and a handle groove (111) being symmetrically provided on the left and right; A lightweight box cover (12) is symmetrically embedded in an embedding groove (112) at the upper end of the lightweight box body (11), with an outer wall surface flush with the outer wall surface of the lightweight box body (11), and is connected to the upper end of the lightweight box body (11) by attraction of a magnet (14), a silicone sealing strip (121) is provided on the edge, and a second handle groove (122) is symmetrically provided at the front and rear ends; The support leg group (13) is used to facilitate the stable stacking of the upper and lower adaptive transport boxes (1), and includes: A support leg (131) is symmetrically fixedly mounted at the middle position of the lower end of the lightweight box (11), and is correspondingly arranged to a support leg slot (113) symmetrically opened at the upper end of the other lightweight box (11); The second leg (132) is rectangularly arranged at the lower end of the lightweight box body (11), and is symmetrically arranged in groups of two, respectively corresponding to the second leg groove (114) symmetrically opened at the upper end of the other lightweight box cover (12).

3. The fruit and vegetable cold chain logistics transport box according to claim 1, characterized in that: The cold air inlet (51) is composed of evenly distributed air inlets, which are opened below one end of the closed storage chamber (2) adjacent to the central circulation channel (3), and are controlled on and off by the central switch seal (53); Wherein, the switch seal 1 (53) comprises: An electric telescopic cylinder (531) is fixedly mounted in a sealing groove (511) at the center of the cold air inlet (51), and is coated with a nano-hydrophobic coating; A sealing plate (532) is fixedly mounted on the telescopic end of the electric telescopic cylinder (531), and has circulation openings (5321) distributed evenly on the sidewalls, which are arranged in a one-to-one correspondence with the air inlet. Both the circulation openings (5321) and the air inlet are arranged to be inclined upward toward the sealed storage chamber (2); The cold air outlet (52) is composed of evenly distributed air outlets, is opened above the end of the sealed storage chamber (2) away from the central circulation channel (3), and is controlled on and off by the central switch seal member 2 (54); Wherein, the switch seal 2 (54) comprises: The second electric telescopic cylinder (541) is fixedly installed in the second sealing groove (521) at the central position of the cold air outlet (52), and the surface is coated with a nano-hydrophobic coating; The second sealing plate (542) is fixedly mounted on the telescopic end of the second electric telescopic cylinder (541), and the side wall is evenly distributed with second flow openings (5421), which are arranged in a one-to-one correspondence with the air outlet. The second flow openings (5421) and the air outlet are both arranged to be inclined downward toward the closed storage chamber (2).

4. The fruit and vegetable cold chain logistics transport box according to claim 1, characterized in that: The inner cooling airflow circulation component (6) comprises: A refrigerator (61) is fixedly mounted in the second embedding slot (115) at the lower end of the adaptive transport box (1) by means of bolts to provide cold air supply; A cold air circulation pipe (62) is embedded in the adaptive transport box (1), with an air extraction end extending to above one end of the closed storage chamber (2) adjacent to the central circulation channel (3), and a filter head (63) is fixedly installed at the end, and an air supply end is connected to the air inlet end of the refrigerator (61); A filter plate (64) is detachably mounted on the bottom of the sealed storage chamber (2), and the bottom forms a cooling zone; An air supply rack (65) is symmetrically arranged in the cooling zone and is formed by a reciprocatingly bent air supply pipe, with a plurality of air supply holes (651) evenly distributed on the upper end, one end of which is connected to the air outlet of the refrigerator (61), and the other end of which is detachably mounted with a sealing cover (66).

5. The fruit and vegetable cold chain logistics transport box according to claim 4, characterized in that: The nitrogen auxiliary component (7) includes: The miniature nitrogen bottle (71) is in a flat square shape and can be detachably mounted in the third embedding slot (116) at the lower end of the adaptive transport box (1) via a quick-release member (9); The nesting frame (72) is formed by a reciprocatingly bent air supply pipe 2, coaxially nested in the air supply pipe 1, with a gap between the air supply pipe 1 and the air supply pipe 2, and filled with a silicone shock-absorbing pad, and a plurality of air supply holes 2 (721) are evenly distributed on the peripheral wall, one end of which is connected to the micro nitrogen bottle (71), and the other end of which is detachably mounted with a sealing cover 2 (73).

6. The fruit and vegetable cold chain logistics transport box according to claim 1, characterized in that: The sensor group (8) includes: Temperature sensors (81) are horizontally and evenly spaced within the central flow channel (3); Temperature sensors (82) are vertically and evenly spaced on the side wall of the sealed storage chamber (2); The gas concentration sensor (83) is vertically and equidistantly arranged on the side wall of the sealed storage chamber (2) and is located next to the second temperature sensor (82).

7. The fruit and vegetable cold chain logistics transport box according to claim 1, characterized in that: The gas guide member (4) comprises: The guide fan (41) is evenly distributed at equal heights in the central circulation channel (3) to transport the cold air flow from the bottom to the top. It uses a brushless DC motor and is dynamically started and stopped according to temperature sensor data to reduce energy consumption. The guide plate (42) is arranged in the central circulation channel (3) in an inverted cone shape to guide the cold air into the cold air inlet (51).

8. The fruit and vegetable cold chain logistics transport box according to claim 1, characterized in that: The peripheral wall of the sealed storage chamber (2) comprises: The outer layer (21) is made of high-strength PP or ABS plastic to provide structural support; The middle layer (22) adopts PCM packaging unit to evenly distribute the heat buffer function; The inner layer (23) is made of a food-grade heat-conducting mesh plate, which is evenly distributed with flow holes (231) to promote heat exchange between cold air and PCM.

9. The fruit and vegetable cold chain logistics transport box according to claim 5, characterized in that: The quick-release part (9) includes: A movable plate (91) is symmetrically arranged in a movable groove at the lower end of the adaptive transport box (1); A spring (92) is evenly distributed at one end of the movable plate (91) to provide elastic restoring force for the movable plate (91); A plug-in plate (93), one end of which is fixedly mounted on one end of the movable plate (91), and the other end of which is plugged into the side wall of the miniature nitrogen bottle (71) to play a fixing role; A quick-release rod (94) is fixedly mounted on the outside of the movable plate (91), with its end exposed from the lower wall of the adaptive transport box (1).

10. The fruit and vegetable cold chain logistics transport box according to claim 1, characterized in that: The front end of the adaptive transport box (1) is inlaid with a central control display screen (15), and the central control display screen (15) displays the dynamic curves of temperature, humidity and gas concentration collected by the sensor group (8) in real time. Control buttons (16) are distributed at the lower end of the central control display screen (15).

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