Reusable constant-temperature fresh-keeping fresh turnover box and intelligent tracking temperature control adaptation method

Abstract

The present application relates to the cross field of fresh food cold chain storage and transportation equipment and intelligent Internet of Things technology, and specifically discloses a reusable constant-temperature fresh-keeping fresh food turnover box and an intelligent tracking temperature control adaptation method, which comprises a box body and a box cover, a composite constant-temperature heat insulation layer is arranged in the multi-layer composite inner layer of the box body, a detachable phase change cold storage module is arranged in the bottom of the box body through embedding in the embedded groove, an annular silica gel sealing gasket is arranged on the top of the box body, a buckle type lock catch is arranged between the box body and the box cover, the annular silica gel sealing gasket and the buckle type lock catch form a double-sealing locking structure, a spiral air permeation regulating valve is arranged on the side wall of the box body, and a leakage-proof flow guide liquid collecting structure is integrally arranged on the inner bottom of the box body. Through the arrangement of a series of structures, the turnover box realizes full-process positioning tracking, environment monitoring, attitude early warning and asset tracing, improves the fresh food storage and transportation safety, and reduces the circulation loss and the whole life cycle use cost.

Description

Technical Field

[0001] This invention relates to the intersection of fresh food cold chain warehousing and transportation equipment and smart Internet of Things technology, specifically a reusable constant temperature fresh food turnover box and a smart tracking temperature control adaptation method. Background Technology

[0002] With the rapid development of fresh food e-commerce, pre-prepared meal industry, and community group buying, the scale of domestic fresh food cold chain distribution has been increasing year by year. This has led to increasingly higher requirements for the preservation performance, environmental friendliness, reusability, intelligence, and traceability of cold chain turnover equipment. However, the current mainstream fresh food turnover technologies and equipment in the industry have many insurmountable technical defects that cannot meet the needs of high-quality cold chain distribution, as detailed below: Firstly, disposable EPS foam boxes remain the mainstream packaging material. Although the initial purchase cost is low, they can only be used once, generating a large amount of non-degradable white pollution after disposal, which contradicts the national "dual carbon" target and plastic restriction environmental protection policy. Moreover, the long-term cumulative cost is extremely high. The insulation layer structure is simple, the heat preservation effect is poor, the temperature fluctuates greatly, and the spoilage rate of fresh produce remains high year-round. Secondly, traditional rigid cold chain turnover boxes are mostly single-layer ordinary plastic structures without composite high-efficiency heat insulation design. Cold energy is lost quickly, and there are no dedicated modular cold storage components. They rely solely on external cold chain equipment for temperature control, and cannot maintain a constant temperature after being disconnected from the power source, failing to meet the needs of short-distance delivery without external power. Thirdly, existing turnover boxes generally suffer from the technical pain point of incompatibility between sealing and ventilation. Full sealing leads to the accumulation of respiratory exhaust gas in fresh fruits and vegetables, and excessive humidity, causing rot and mold. First, open ventilation leads to rapid loss of cold air and loss of preservation effect; currently, there is no differentiated ventilation and temperature control solution suitable for multiple types of fresh produce. Second, most turnover boxes lack a leak-proof liquid collection structure, allowing condensate and exudate to accumulate at the bottom of the box, soaking the food, accelerating bacterial growth and spoilage. The boxes have poor impact resistance, extremely low reuse count, and must be scrapped entirely after damage, resulting in high maintenance costs. Third, existing technologies either focus only on improving the hardware structure of the turnover box or only on a single intelligent tracking function, failing to achieve the organic integration of constant temperature preservation hardware, temperature control methods, and intelligent tracking technology. The intelligent adaptability is poor, and it is impossible to achieve integrated management of turnover box full-process positioning, environmental monitoring, attitude warning, and asset traceability. The industry lacks an integrated system that combines high reusability, long-term constant temperature, multi-category adaptability, green environmental protection, and intelligent tracking. Summary of the Invention

[0003] The purpose of this invention is to provide a reusable constant temperature fresh food turnover box and an intelligent tracking temperature control adaptation method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a reusable constant-temperature fresh food turnover box, comprising a box body and a box lid. The box body has a composite constant-temperature insulation layer in its multi-layer composite internal interlayer. A detachable phase-change cold storage module is embedded in the bottom of the box body through an embedded groove. An annular silicone sealing gasket is provided on the top of the box body. A snap-lock is provided between the box body and the box lid. The annular silicone sealing gasket and the snap-lock form a double sealing and locking structure. A spiral ventilation regulating valve is provided on the side wall of the box body. An anti-leakage drainage and liquid collection structure is integrally provided on the bottom of the box body. A multi-scenario handling adaptation structure is provided on the exterior of the box body. An embedded intelligent tracking module is provided on the inner wall of the box body through an intelligent tracking module mounting position. The embedded intelligent tracking module integrates a main control chip, a GNSS positioning module, a 4G communication module, an attitude sensor, a temperature and humidity sensor, and a passive RFID tag. A transparent observation window is provided on one side of the box body, and a temperature display sticker is provided on the box body on the side of the transparent observation window.

[0005] Preferably, the four corners of the main body of the box are reinforced with rounded corners, and the four corners of the bottom of the main body of the box are provided with anti-slip pads. The main body of the box is integrally injection molded from food-grade HDPE reinforced with glass fiber, with a wall thickness of 5mm. Anti-ultraviolet and anti-aging additives are added to the material. The side walls of the main body of the box are provided with anti-slip grooves. The interior of the main body of the box is provided with an adjustable partition. The adjustable partition can move horizontally or vertically inside the main body of the box. The multi-scene handling adaptation structure includes embedded handles and buckles. Embedded handles are provided at the upper ends of opposite sides of the main body of the box, and buckles are provided at the upper ends of opposite sides of the main body of the box.

[0006] Preferably, the composite constant temperature insulation layer is composed of VIP vacuum insulation board and PU polyurethane foam board, which are filled in the multi-layer composite sandwich of the main body of the box. The temperature and humidity sensor of the embedded intelligent tracking module adopts AHT21 / SHT30 probe plate or patch plate. The patch plate is mounted on the PCB board and contacts the air inside the box through the vent hole of the shell. The probe plate leads out the temperature and humidity sensor probe through the waterproof connection line. The temperature and humidity sensor probe is suspended in the central area of ​​the box.

[0007] Preferably, the detachable phase change cold storage module includes a freezing type phase change module and a refrigeration type phase change module. The detachable phase change cold storage module is provided with a sealed encapsulation shell, and the surface of the detachable phase change cold storage module is provided with an anti-condensation coating.

[0008] Preferably, the spiral ventilation regulating valve adopts a spiral three-speed adjustment structure, and the valve body of the spiral ventilation regulating valve has a built-in high-density dustproof and antibacterial filter.

[0009] Preferably, the anti-leakage diversion and liquid collection structure includes an inclined diversion channel, a liquid collection tank, and an absorbent sponge. The inclined diversion channel is provided at the bottom of the inner side of the main body of the box. The inclined diversion channel is inclined at 3°. The bottom of the inner side of the main body of the box at the lower end of the inclined diversion channel is provided with a liquid collection tank. The liquid collection tank is provided with a removable absorbent sponge inside.

[0010] Preferably, an RFID tag slot is provided on one side of the main body of the box, and a passive RFID tag is provided in the RFID tag slot. The embedded intelligent tracking module is installed in the intelligent tracking module mounting position by strong double-sided adhesive or nylon Velcro. The intelligent tracking module mounting position is provided with magnetic charging contacts and RFID antenna window. An LED status indicator is provided on the outer side of the main body of the box on one side of the embedded intelligent tracking module.

[0011] A smart tracking temperature control adaptation method, characterized by the following steps: S1: Based on the type of fresh produce to be stored and transported, select the corresponding phase change cold storage module, complete the freezing and cold storage treatment in advance, and embed the cold storage module into the groove at the bottom of the box to complete the sealed installation; at the same time, install the embedded intelligent tracking module, complete the binding of the module with the cloud platform, and configure the temperature and humidity alarm threshold, tipping detection threshold and positioning frequency parameters. S2: Based on the breathing characteristics and preservation requirements of fresh produce, adjust the spiral ventilation valve to the corresponding position. There are three ventilation adjustment positions: fully sealed, slightly ventilated, and fully ventilated. The embedded intelligent tracking module starts temperature and humidity collection, collects temperature and humidity data inside the box at preset intervals, and uploads them to the cloud platform simultaneously. S3: The box lid is closed and the snap-lock is engaged to complete the double sealing of the transport box. The transparent observation window and temperature display are used to monitor the status inside the box in real time. The embedded intelligent tracking module starts positioning tracking and attitude detection simultaneously. In the moving state, it is located every 5 minutes. In the stationary state, GNSS positioning is turned off and low power mode is entered. A warning is triggered when the tilt angle exceeds 45° and an alarm is triggered when it exceeds 60°. The event information is immediately reported in the event of impact or drop. S4: During the turnover process, the embedded intelligent tracking module uploads temperature, humidity, positioning, and attitude data in real time. In the event of a network outage, the data is cached in local Flash and automatically re-uploaded after the network is restored. The cloud platform enables trajectory playback, electronic fence warnings, and stop point analysis to monitor the status of the turnover box in real time. S5: After turnover is completed, the box is high-pressure washed and high-temperature disinfected. The detachable phase change cold storage module and water-absorbing sponge on the main body of the box are removed and cleaned separately. The embedded intelligent tracking module is magnetically charged through the magnetic charging contacts. The accessories are classified and stored for recycling. The identity information of the turnover box and intelligent tracking module is read in batches through the RFID reader to complete the inbound and outbound inventory and asset management.

[0012] Preferably, in step S2, the fully sealed setting maintains the humidity inside the chamber at 90%-95%, with a constant temperature duration of 24 hours in the 0-4℃ mode and 18 hours in the -18℃ mode; the slightly ventilated setting maintains the humidity inside the chamber at 75%-85%, with a constant temperature duration of 20 hours in the 0-4℃ mode and 15 hours in the -18℃ mode; the fully ventilated setting maintains the humidity inside the chamber at 60%-70%, with a constant temperature duration of 12 hours in the 0-4℃ mode and 8 hours in the -18℃ mode; the embedded intelligent tracking module compares the collected temperature and humidity data with the preset threshold in real time, and triggers an alarm after exceeding the threshold for 5-15 minutes, reporting the start and end time, location, and data information of the abnormality.

[0013] Preferably, in step S3, the embedded intelligent tracking module uses GNSS positioning and Bluetooth beacon scanning for coordinated positioning; in step S5, the embedded intelligent tracking module supports remote firmware upgrades via 4G or Bluetooth.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This reusable, temperature-controlled fresh food turnover box, along with its intelligent tracking and temperature control adaptation method, achieves long-term constant temperature without external power supply, precise adaptation to multiple fresh food categories, high-frequency reuse, and environmental friendliness through hardware innovations such as composite insulation structure, modular cold storage, three-level differentiated ventilation, and leak-proof liquid collection. Combined with product-specific temperature control methods and an embedded intelligent tracking module, it integrates these features. Simultaneously, it enables full-process positioning and tracking of the turnover box, environmental monitoring, attitude warning, and asset traceability, improving the safety of fresh food storage and transportation, reducing circulation losses and total life-cycle costs. This solves the problems of existing fresh food cold chain turnover equipment, including poor environmental performance, weak temperature control, inability to balance sealing and ventilation, easy leakage and spoilage, low reuse rate, disconnect between hardware and temperature control methods, and lack of full-process intelligent tracking and traceability capabilities. It possesses the following advantages: 1. Breakthrough in both green environmental protection and economy: The box can be recycled ≥250 times, completely replacing disposable foam boxes and cardboard boxes, reducing packaging material costs and white pollution by more than 70%, which is in line with the national dual carbon and environmental protection policies; the material has excellent anti-aging and impact resistance, and some parts can be replaced individually without the need for overall scrapping. The intelligent tracking module adopts a rechargeable design with a charge-discharge cycle life of ≥800 times, which matches the replacement cycle of the turnover box. The total life cycle cost is far lower than that of traditional turnover boxes and single intelligent tracking devices, and the economic benefits of large-scale application are significant. 2. Long-lasting passive temperature control, maintaining freshness even without power: Utilizing a composite high-efficiency insulation layer and a double-sealed structure, combined with a modular phase-change cold storage module, it can maintain a constant temperature for 24 hours in refrigeration mode and 18 hours in freezing mode without an external power source. This fully covers the entire process of short-distance fresh food delivery and warehousing transit, improving insulation and temperature control efficiency by 40% compared to traditional cabinets, solving the problem of freshness preservation in scenarios without an external power source. At the same time, the intelligent tracking module monitors temperature and humidity in real time, providing timely alarms in case of abnormalities to avoid fresh food loss due to temperature control failure. 3. Precisely adaptable to various types of fresh produce, significantly reducing losses: Equipped with three levels of ventilation adjustment technology and differentiated temperature control methods, it sets sealed, slightly ventilated, and fully ventilated modes for meat and seafood, leafy vegetables and mushrooms, and root vegetables and fruits respectively. It precisely controls the humidity and air volume inside the box, avoiding oxidation, rotting, sprouting, and mold growth of food. The loss of fresh produce during circulation can be reduced to below 8%, breaking through the limitations of the single mode of traditional turnover boxes; the intelligent tracking module helps to determine the appropriate ventilation level, further improving the preservation effect. 4. Leak-proof and antibacterial design enhances storage and transportation safety: The inclined drainage channel at the bottom of the box works in conjunction with the liquid collection tank to completely solve the problem of condensation soaking food. The removable absorbent sponge and antibacterial coating provide dual antibacterial protection, meeting food-grade safety standards and effectively inhibiting bacterial growth. The intelligent tracking module's posture detection function can promptly detect abnormalities such as tipping or impact of the turnover box, preventing food from being crushed and damaged and condensation from overflowing, further improving the safety and shelf life of fresh food storage and transportation. 5. Hardware + Methodology + Intelligent Tracking Collaborative Innovation for More Comprehensive Protection: This invention simultaneously protects the product structure, temperature control adaptation method, and intelligent tracking control logic, falling within the core protection scope of invention patents. Compared to improvements in a single structure or function, it boasts higher creativity and a broader protection scope. The container is adaptable to multiple scenarios such as forklifts, drone grabbing, and intelligent sorting. The intelligent tracking module enables full-process positioning, traceability, and asset management, and can be connected to cold chain traceability systems. It has a high degree of intelligence, adapts to the upgrade needs of modern cold chain logistics, and solves the pain point of insufficient intelligence in traditional turnover boxes. 6. Intelligent control throughout the entire process to improve operational efficiency: The intelligent tracking module enables full-process positioning and tracking of turnover boxes, environmental monitoring and attitude warning. The cloud platform can view the status of turnover boxes, trajectory playback and abnormal events in real time, realizing "intervention in the process" instead of "remediation after the event" and improving the efficiency of abnormal response. Passive RFID tags enable batch inbound and outbound inventory, improving the efficiency of operation by 5-10 times. At the same time, it realizes full life cycle management of turnover box assets and reduces operation and maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the inclined guide channel in this invention; Figure 3 This is a schematic diagram of the temperature and humidity sensor probe in this invention; Figure 4 This is a schematic diagram of the main body of the box in this invention; Figure 5 This is a flowchart of the intelligent tracking temperature control adaptation method in this invention.

[0016] In the diagram: 1. Main body of the enclosure; 2. Lid; 3. Rounded corner reinforcement; 4. Composite constant temperature insulation layer; 5. Detachable phase change cold storage module; 6. Annular silicone sealing gasket; 7. Snap-on lock; 8. Spiral venting regulating valve; 9. Inclined guide channel; 10. Liquid collection tank; 11. Adjustable partition plate; 12. RFID tag slot; 13. Embedded handle; 14. Transparent observation window; 15. Anti-slip foot pads; 16. Embedded intelligent tracking module; 17. Magnetic charging contacts; 18. Temperature and humidity sensor probe; 19. RFID antenna window; 20. LED status indicator. Detailed Implementation

[0017] 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.

[0018] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] like Figures 1 to 3As shown, this embodiment of a reusable constant-temperature fresh food turnover box includes a main body 1 and a lid 2. The main body 1 has a multi-layer composite internal interlayer with a composite constant-temperature insulation layer 4. The bottom of the main body 1 has a detachable phase change cold storage module 5 embedded in a groove. The top of the main body 1 has an annular silicone sealing gasket 6. A snap-lock 7 is provided between the main body 1 and the lid 2. The annular silicone sealing gasket 6 and the snap-lock 7 form a double sealing and locking structure. The side wall of the main body 1 has a spiral ventilation regulating valve 8. The bottom of the main body 1 is integrally equipped with a... It features a leak-proof, diversion, and liquid collection structure. The exterior of the main body 1 is equipped with a multi-scenario handling adaptability structure. An embedded intelligent tracking module 16 is installed on the inner wall of the main body 1 via an intelligent tracking module mounting position. The embedded intelligent tracking module 16 integrates a main control chip, a GNSS positioning module, a 4G communication module, an attitude sensor, a temperature and humidity sensor, and a passive RFID tag. A transparent observation window 14 is located on one side of the main body 1, and a temperature display sticker is installed on the side of the main body 1 near the transparent observation window 14. This design solves the problems of poor environmental performance and lack of external power supply in existing fresh food handling equipment, which prevent long-term stable operation. Addressing technical challenges such as poor adaptability to various types of fresh produce, susceptibility to leakage and spoilage, insufficient intelligence, and lack of end-to-end tracking capabilities, the turnover box's main body is made of food-grade fiberglass-reinforced HDPE material, allowing for ≥250 cycles of recycling. Internally, it features a composite constant-temperature insulation layer 4 and a detachable phase-change cold storage module 5, along with a three-level adjustable vent valve and a leak-proof liquid collection structure, achieving passive, long-term constant temperature without external power. The embedded intelligent tracking module 16 integrates main control, positioning, communication, sensing, and RFID tags, enabling end-to-end positioning and tracking, environmental monitoring, attitude warning, and asset identification of the turnover box. The accompanying temperature control method adjusts the ventilation level and temperature and humidity according to the differences in fresh produce categories, accurately adapting to the preservation needs of various fresh produce. This invention simultaneously protects the product structure, temperature control method, and intelligent tracking control logic, demonstrating high creativity and practicality. It can significantly reduce fresh produce distribution losses and packaging costs, replace disposable consumables in line with green and environmentally friendly requirements, and achieve intelligent management and control of the entire fresh produce cold chain process. It is applicable to all categories of fresh produce, including fruits and vegetables, chilled meat, and seafood, for cold chain warehousing and short-distance delivery. It breaks through existing technical bottlenecks from three dimensions: hardware structure optimization, temperature control method innovation, and intelligent tracking integration.

[0020] Novelty: The composite heat-insulating modular cold storage turnover box structure, the three-level differentiated permeable temperature control adaptation method, and the integrated design of the embedded intelligent tracking module 16 and the constant temperature preservation structure of the present invention are all novel. Compared with existing disposable foam boxes, traditional single-layer cold chain turnover boxes, and single intelligent tracking devices, the overall technical solution is unique, especially the collaborative design of constant temperature preservation and intelligent tracking.

[0021] Creativity: Existing technologies only make simple material or shape improvements to the turnover box structure, or only provide a single intelligent tracking function. They do not propose a hardware structure that combines composite heat insulation, modular cold storage, and three-level ventilation, nor do they form an integrated solution that combines a differentiated temperature control method for fresh produce with intelligent tracking technology. This invention overcomes the long-standing technical biases in the field, such as the inability to balance sealing and ventilation, the inability to maintain constant temperature without an external power source, low reusability, and insufficient intelligence. Through triple innovation in hardware structure, temperature control method, and intelligent tracking technology, it achieves significant technological progress and possesses outstanding substantive features and significant technological advancements.

[0022] Practicality: The technical solution of this invention can be mass-produced industrially. The hardware structure of the turnover box and the processing technology of the intelligent tracking module are both mature. The temperature control method and intelligent tracking control logic are simple to operate and easy to implement. It can be repeatedly implemented and applied to all scenarios of fresh food cold chain storage and short-distance delivery. It can stably achieve the technical effects of long-term preservation, recycling, intelligent tracking and traceability management. It has practical industrial application value and can generate significant economic, environmental and social benefits. It is extremely practical.

[0023] Specifically, the four corners of the main body 1 are reinforced with rounded corners 3, and the four corners of the bottom of the main body 1 are provided with anti-slip pads 15. The main body 1 is made of food-grade HDPE reinforced with glass fiber and integrally injection molded with a wall thickness of 5mm. Anti-ultraviolet and anti-aging additives are added to the material. The side walls of the main body 1 are provided with anti-slip grooves. The interior of the main body 1 is provided with an adjustable partition 11, which can move horizontally or vertically inside the main body 1. The interior of the main body is provided with a pluggable adjustable partition 11, which can be flexibly adjusted horizontally and vertically to divide independent storage space as needed. The silver ion antibacterial coating on the surface of the main body can withstand high-pressure water gun washing and 80℃ hot water disinfection. Damaged parts can be replaced individually without the need for overall scrapping. The multi-scenario handling adaptation structure includes embedded handles 13 and buckles. Embedded handles 13 are provided on the upper ends of opposite sides of the main body 1, and buckles are provided on the upper ends of opposite sides of the main body 1.

[0024] Furthermore, the composite constant temperature insulation layer 4 is filled with a composite of VIP vacuum insulation board and PU polyurethane foam board inside the multi-layer composite sandwich of the main body 1, with an overall insulation coefficient ≤0.02W / (m·K). The seam between the cover 2 and the main body 1 is embedded with an annular silicone sealing gasket 6 with a Shore hardness of 50°, which, together with the four-point snap-lock 7, achieves double sealing, and the overall sealing level reaches IP65 level, effectively blocking internal and external heat exchange and cold loss. The temperature and humidity sensor of the embedded intelligent tracking module 16 adopts an AHT21 / SHT30 probe plate or a patch plate. The patch plate is mounted on the PCB board and contacts the air inside the box through the vent hole of the shell. The probe plate leads out the temperature and humidity sensor probe 18 through a waterproof connecting wire. The temperature and humidity sensor probe 18 is suspended in the central area of ​​the box to ensure the accuracy of temperature and humidity detection, with a detection accuracy of ±0.5℃ and ±3%RH.

[0025] Furthermore, the detachable phase change cold storage module 5 includes a freezing type phase change module and a refrigeration type phase change module. The detachable phase change cold storage module 5 is equipped with a sealed outer shell, and the surface of the detachable phase change cold storage module 5 is coated with an anti-condensation coating. The freezing type phase change module is a -18℃ freezing type, and the refrigeration type phase change module is a 0-4℃ refrigeration type. The outer shell is made of food-grade HDPE material and is sealed and encapsulated. It is embedded in the pre-set groove at the bottom of the main body 1 of the box and fits the groove seamlessly. It can be removed separately to complete freezing and cold storage, and can be used repeatedly without loss. This cold storage hardware is the core constant temperature component. It can achieve passive long-term temperature control without external power supply. The temperature and humidity sensor of the embedded intelligent tracking module 16 works in conjunction with the phase change cold storage module to collect the temperature and humidity data inside the box in real time and upload it to the cloud platform in real time to achieve real-time monitoring of the constant temperature effect.

[0026] Furthermore, the spiral ventilation regulating valve 8 adopts a spiral three-level adjustment structure. The valve body of the spiral ventilation regulating valve 8 has a built-in high-density dustproof and antibacterial filter, which can accurately switch between three working levels: full seal, micro ventilation, and full ventilation. Among them, the micro ventilation level has an air volume of ≤50mL / min, and the full ventilation level has an air volume of ≥200mL / min. The valve is sealed to the side wall of the box without any cold leakage gap. The humidity and ventilation volume inside the box can be adjusted according to the type of fresh produce. The embedded intelligent tracking module 16 can assist in judging the appropriateness of the ventilation level based on the collected temperature and humidity data, and trigger an alarm prompt when there is an abnormality.

[0027] Furthermore, the leak-proof drainage and liquid collection structure includes an inclined drainage channel 9, a liquid collection tank 10, and an absorbent sponge. The inclined drainage channel 9 is located at the bottom of the inner side of the main body 1. The inclined drainage channel 9 is inclined at 3°. The liquid collection tank 10 is located at the bottom of the inner side of the main body 1 at the lower end of the inclined drainage channel 9. The liquid collection tank 10 is equipped with a removable absorbent sponge. The inclined drainage channel 9 can guide the fresh condensate to the liquid collection tank 10 for collection, avoiding water accumulation and soaking of the food. The absorbent sponge can be disassembled, cleaned, and replaced, and also has antibacterial and anti-spoilage functions. The posture sensor of the embedded intelligent tracking module 16 can detect the tilting state of the turnover box to prevent the condensate in the liquid collection tank from overflowing. An alarm is triggered when the tilting angle exceeds a preset threshold.

[0028] Furthermore, one side of the main body 1 of the enclosure is equipped with an RFID tag slot 12 and a Bluetooth temperature and humidity recorder mounting position. The RFID tag slot 12 contains a passive RFID tag. The embedded intelligent tracking module 16 is mounted in the intelligent tracking module mounting position using strong double-sided adhesive or nylon Velcro. The embedded intelligent tracking module 16 adopts a flat design with dimensions of approximately 200mm × 200mm × 20mm, which does not occupy effective loading space. The shell is made of PC+ABS engineering plastic, has an IP65 sealing protection rating, is resistant to low temperatures of -40℃, is impact-resistant, and is suitable for cold chain logistics. For wet environments and cleaning / disinfection operations, the smart tracking module mounting position is equipped with magnetic charging contacts 17 and RFID antenna windows 19. The embedded smart tracking module 16 adopts a magnetic PogoPin contact charging solution, with a built-in ≥5000mAh lithium polymer battery, a charge-discharge cycle life of ≥800 times, and can be used continuously for 30 days on a single charge, adapting to the needs of reusable turnover boxes. An LED status indicator 20 is provided on the outer side of the main body 1 of the box on one side of the embedded smart tracking module 16. The main control chip of the embedded smart tracking module 16 adopts the Goodix GR5525 low-power Bluetooth 5.3 SoC, the GNSS positioning module adopts the Huada Beidou TAU1113 dual-mode positioning module, the 4G communication module adopts the China Mobile IoT ML307A LTE Cat.1 module, the attitude sensor adopts the ST LIS2DW12 triaxial accelerometer, and the passive RFID tag is in the UHF band, with no electrical connection to the main control system, relying on the radio frequency energy of the reader to work passively, realizing batch inventory and offline identification.

[0029] A smart tracking temperature control adaptation method, characterized by the following steps: S1: Based on the type of fresh produce to be stored and transported, select the corresponding phase change cold storage module, complete the freezing and cold storage treatment in advance, and embed the cold storage module into the groove at the bottom of the box to complete the sealed installation; at the same time, install the embedded intelligent tracking module 16, complete the binding of the module with the cloud platform, and configure the temperature and humidity alarm threshold, tipping detection threshold and positioning frequency parameters. S2: Based on the respiratory characteristics and preservation requirements of fresh produce, adjust the spiral ventilation valve 8 to the corresponding position. There are three ventilation adjustment positions: fully sealed, slightly ventilated, and fully ventilated. The fully sealed position is suitable for chilled meat and seafood, the slightly ventilated position is suitable for leafy vegetables and mushrooms, and the fully ventilated position is suitable for root vegetables. The embedded intelligent tracking module 16 starts collecting temperature and humidity data, collecting the temperature and humidity data inside the box at preset intervals (configurable from 1 to 60 minutes), and uploading it synchronously to the cloud platform. S3: Close the lid 2 and engage the snap-lock 7 to complete the double sealing of the transport box. The status inside the box is monitored in real time through the transparent observation window 14 and the temperature display. The embedded intelligent tracking module 16 starts positioning tracking and attitude detection simultaneously. In motion, it locates the box every 5 minutes. In stationary state, it turns off GNSS positioning and enters low power mode. A warning is triggered when the tilt angle exceeds 45° and an alarm is triggered when it exceeds 60°. The event information is reported immediately when there is an impact or drop. S4: During the turnover process, the embedded intelligent tracking module 16 uploads temperature, humidity, positioning, and attitude data in real time. In the absence of network, the data is cached in local Flash (up to 10,000 records can be stored), and automatically re-uploaded after the network is restored. The cloud platform enables trajectory playback, electronic fence warning, and stop point analysis to monitor the status of the turnover box in real time. S5: After the turnover is completed, the box is high-pressure washed and high-temperature disinfected. The detachable phase change cold storage module 5 and water-absorbing sponge on the main body of the box 1 are removed and cleaned separately. The embedded intelligent tracking module 16 is magnetically charged through the magnetic charging contact 17. The accessories are classified and stored for recycling. The identity information of the turnover box and the intelligent tracking module is read in batches through the RFID reader to complete the inbound and outbound inventory and asset management.

[0030] Furthermore, in step S2, the fully sealed setting maintains the humidity inside the chamber at 90%-95%, with a constant temperature duration of 24 hours in the 0-4℃ mode and 18 hours in the -18℃ mode; the slightly ventilated setting maintains the humidity inside the chamber at 75%-85%, with a constant temperature duration of 20 hours in the 0-4℃ mode and 15 hours in the -18℃ mode; the fully ventilated setting maintains the humidity inside the chamber at 60%-70%, with a constant temperature duration of 12 hours in the 0-4℃ mode and 8 hours in the -18℃ mode; the embedded intelligent tracking module 16 compares the collected temperature and humidity data with the preset thresholds in real time, and triggers an alarm after exceeding the threshold for 5-15 minutes (preset according to product category), reporting the start and end time, location, and data information of the abnormality.

[0031] Furthermore, in step S3, the embedded intelligent tracking module 16 uses GNSS positioning and Bluetooth beacon scanning for coordinated positioning (accuracy of 3 meters). In indoor semi-obscured scenarios such as warehouses and distribution centers, Bluetooth beacon-assisted positioning is used. During trunk / branch line transportation, it is associated with the vehicle positioning of the logistics vehicle, and during last-mile delivery, it is associated with the positioning of the courier's mobile APP, achieving full-process positioning and tracking without blind spots. In step S5, the embedded intelligent tracking module 16 supports remote firmware upgrades via 4G or Bluetooth.

[0032] Example 1: Implementation of Storage and Transportation Structure and Methods for Fresh Meat and Seafood In this embodiment, the overall dimensions of the turnover box are 600mm×400mm×300mm. The box body is made of food-grade HDPE fiberglass reinforced material with a wall thickness of 5mm. It is temperature resistant from -20℃ to 60℃, reinforced with 30mm rounded corners, and can be stacked up to 8 layers with a turnover rate of ≥250 times. The composite constant temperature insulation layer has a thermal insulation coefficient of ≤0.02W / (m·K), the box lid has an IP65 sealing rating, and a 0-4℃ refrigeration phase change cold storage module is selected. After freezing and cold storage is completed 12 hours in advance, the module is embedded in the groove at the bottom of the box body.

[0033] The embedded intelligent tracking module 16 is installed inside the cabinet and uses an AHT21B SMT surface mount temperature and humidity sensor. It contacts the air inside the cabinet through the vent holes in the outer shell and is configured with temperature and humidity alarm thresholds: an alarm is triggered if the temperature is <-2℃ or >8℃ for 10 minutes, and an alarm is triggered if the humidity is <85% or >95% for 10 minutes. The tilt warning angle is 45°, the alarm angle is 60°, the impact threshold is 2g, the positioning frequency is 5 minutes / time, the sampling interval is 10 minutes / time, and it is bound to the cloud platform.

[0034] The temperature control and intelligent tracking collaborative method is implemented as follows: Adjust the ventilation valve to the fully sealed position to maintain the humidity inside the box at 90%-95%. After placing chilled meat or seafood inside, close the lid latch. It can maintain a constant temperature for 24 hours without an external power source. The embedded intelligent tracking module 16 collects temperature, humidity, positioning, and attitude data in real time and uploads them synchronously to the cloud platform. Condensate inside the box flows into the collection tank 10 through a 3° inclined guide channel 9, where it is absorbed by an absorbent sponge to prevent food from soaking. If any abnormalities occur, such as excessive temperature, tipping, or impact, the module immediately reports an alarm, and the cloud platform pushes a warning message, allowing management personnel to intervene promptly. After the initial handling, rinse the box with a high-pressure water gun, disinfect with 80°C hot water, disassemble the cold storage module and sponge for separate cleaning, magnetically charge the embedded intelligent tracking module 16, and read the module's identity information using an RFID reader to complete the inventory check for future reuse.

[0035] Example 2: Implementation of Storage and Transportation Structure and Methods for Leafy Vegetables and Mushrooms The hardware structure of the turnover box in this embodiment is the same as that in Embodiment 1. A 0-4℃ refrigeration phase change cold storage module is selected. The embedded intelligent tracking module 16 uses an SHT30 probe version temperature and humidity sensor with a probe length of 200mm, which is suspended in the center area of ​​the box. The temperature and humidity alarm thresholds are configured as follows: an alarm is triggered when the temperature is <-2℃ or >8℃ for 10 minutes, and an alarm is triggered when the humidity is <75% or >85% for 10 minutes. The other parameters are the same as those in Embodiment 1.

[0036] The temperature control and intelligent tracking coordination method is adjusted as follows: the ventilation regulating valve is set to the micro-ventilation setting, with an air flow rate of ≤50mL / min, maintaining the humidity inside the box at 75%-85%, expelling carbon dioxide and excess moisture produced by the respiration of leafy vegetables and mushrooms, and preventing yellowing and mold; the constant temperature duration is 20 hours without external power supply, and an adjustable partition 11 is installed inside to prevent food from being squeezed and damaged; the embedded intelligent tracking module 16 monitors the temperature and humidity inside the box and the posture of the turnover box in real time, and uploads the data synchronously. If abnormal humidity or tipping occurs, an alarm is triggered immediately; after turnover, the cleaning, disinfection, charging and inventory process is the same as in Example 1, which is suitable for direct delivery from fruit and vegetable production areas and supermarket replenishment scenarios.

[0037] Example 3: Implementation of Storage and Transportation Structure and Methods for Root and Tuber Fruits and Vegetables The hardware structure of the turnover box in this embodiment is the same as that in Embodiment 1. A 0-4℃ refrigeration phase change cold storage module is selected. The temperature and humidity alarm thresholds of the embedded intelligent tracking module 16 are configured as follows: an alarm is triggered when the temperature is <-2℃ or >8℃ for 10 minutes, and an alarm is triggered when the humidity is <60% or >70% for 10 minutes. The positioning frequency is adjusted to 10 minutes / time. The remaining parameters are the same as those in Embodiment 1.

[0038] The temperature control and intelligent tracking coordination method has been adjusted as follows: the ventilation regulating valve is set to the full ventilation position, with an airflow of ≥200mL / min, maintaining the humidity inside the box at 60%-70% to keep the box dry and prevent potatoes, carrots, and citrus fruits from sprouting, condensing, or becoming moldy; the constant temperature duration is 12 hours without external power, suitable for short-distance bulk delivery; the intelligent tracking module uploads temperature, humidity, and location data in real time, and triggers an alert on the cloud platform if abnormal humidity or prolonged stay occurs; after turnover, the box can be high-pressure washed and disinfected, and the embedded intelligent tracking module can be recharged and reused repeatedly, improving operational efficiency through RFID bulk inventory. Working principle: In terms of hardware structure, the reusable constant temperature fresh food turnover box of this invention consists of a box body 1, a box lid 2, a composite constant temperature insulation layer 4, a detachable phase change cold storage module 5, a three-level adjustable venting valve, a leak-proof liquid collection structure, intelligent adapter components, a handling adapter structure, and an embedded intelligent tracking module 16. The box body 1 is injection molded from food-grade HDPE glass fiber reinforced material, with added anti-aging and anti-UV additives, possessing excellent high and low temperature resistance and impact resistance, and can be recycled ≥250 times. The interlayer uses VIP vacuum insulation board and PU foam composite filling to form a composite constant temperature insulation layer 4. With a double-sealed silicone structure, cold energy conduction loss is significantly reduced; the bottom modular phase change cold storage component is available in refrigeration and freezing specifications, which can be used independently for cold storage and circulation, achieving passive constant temperature without external power supply; the three-stage ventilation valve on the side wall can precisely adjust the ventilation and humidity according to the type of fresh produce, and with the bottom anti-leakage liquid collection structure, the problems of water accumulation and respiration spoilage are completely solved; the box body has reserved installation positions for smart tags and temperature and humidity monitoring, which are suitable for cold chain traceability and intelligent management; the embedded intelligent tracking module 16 adopts a four-layer modular architecture of "main control + sensor + positioning + power supply", integrating the Goodix GR5525 main control chip, Huada Beidou TAU1113 GNSS positioning module, China Mobile IoT ML307A 4G communication module, ST LIS2DW12 attitude sensor, AHT21 / SHT30 temperature and humidity sensor and UHF band passive RFID tag, adopts magnetic charging, IP65 sealing and flat installation design, which is suitable for the recycling of turnover boxes and the harsh environment of cold chain.

[0039] Regarding temperature control methods, this invention provides a customized temperature control adaptation process for fresh produce. Based on the respiratory characteristics, humidity requirements, and preservation temperatures of different fresh produce categories, the specifications of the cold storage module and the setting of the vent valve are selected accordingly. The corresponding constant temperature duration and humidity control range are set to form a standardized storage and transportation operation method. This achieves a perfect match between the hardware structure and the temperature control logic, solving the technical problem that a single structure cannot adapt to all categories of fresh produce. At the same time, it standardizes the recycling and cleaning / disinfection process, extending the service life of the container.

[0040] In terms of intelligent tracking and control, the embedded intelligent tracking module 16 works in conjunction with the temperature control structure. It collects environmental data inside the box in real time through temperature and humidity sensors, and the attitude sensor detects the tilting, impact, and drop status of the turnover box. The GNSS positioning module and 4G communication module realize full-process positioning tracking and data uploading. Passive RFID tags realize batch inventory and offline identification. The cloud platform receives and processes data to realize trajectory playback, electronic fence warning, abnormal alarm, data query and asset management. It also supports remote configuration of module parameters and firmware upgrades to achieve coordinated control of intelligent tracking and constant temperature preservation.

[0041] 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reusable constant temperature fresh food turnover box, comprising a box body (1) and a box lid (2), characterized in that: The main body of the box (1) has a multi-layer composite internal interlayer with a composite constant temperature insulation layer (4). The bottom of the main body of the box (1) is embedded with a detachable phase change cold storage module (5) through an embedded groove. The top of the main body of the box (1) is provided with an annular silicone sealing gasket (6). A snap-lock (7) is provided between the main body of the box (1) and the box cover (2). The annular silicone sealing gasket (6) and the snap-lock (7) form a double sealing and locking structure. The side wall of the main body of the box (1) is provided with a spiral ventilation regulating valve ( 8) The bottom of the main body (1) of the box is provided with an anti-leakage diversion and liquid collection structure. The exterior of the main body (1) of the box is provided with a multi-scenario handling adaptation structure. The inner wall of the main body (1) of the box is provided with an embedded intelligent tracking module (16) through the intelligent tracking module mounting position. The embedded intelligent tracking module (16) integrates a main control chip, a GNSS positioning module, a 4G communication module, an attitude sensor, a temperature and humidity sensor and a passive RFID tag. A transparent observation window (14) is provided on one side of the main body (1).

2. The reusable constant temperature fresh food turnover box according to claim 1, characterized in that: The four corners of the main body (1) are reinforced with rounded corners (3). The four corners of the bottom of the main body (1) are provided with anti-slip pads (15). The main body (1) is made of food-grade HDPE reinforced with glass fiber and integrally injection molded with a wall thickness of 5mm. Anti-ultraviolet and anti-aging additives are added to the material. The side wall of the main body (1) is provided with anti-slip grooves. The interior of the main body (1) is provided with an adjustable partition (11). The adjustable partition (11) can move horizontally or vertically inside the main body (1). The main body (1) on one side of the transparent observation window (14) is provided with a temperature display sticker. The multi-scene handling adapter structure includes an embedded handle (13) and a buckle. The upper ends of the main body (1) on both sides are provided with embedded handles (13). The upper ends of the main body (1) on both sides are provided with buckles.

3. The reusable constant temperature fresh food turnover box according to claim 1, characterized in that: The composite constant temperature insulation layer (4) is filled in the multi-layer composite sandwich of the main body (1) by VIP vacuum insulation board and PU polyurethane foam board. The temperature and humidity sensor of the embedded intelligent tracking module (16) adopts AHT21 / SHT30 probe plate or patch plate. The patch plate is mounted on the PCB board and contacts the air inside the box through the vent hole of the shell. The probe plate leads out the temperature and humidity sensor probe (18) through the waterproof connection line. The temperature and humidity sensor probe (18) is suspended in the central area of ​​the box.

4. The reusable constant temperature fresh food turnover box according to claim 1, characterized in that: The detachable phase change cold storage module (5) includes a freezing type phase change module and a refrigeration type phase change module. The detachable phase change cold storage module (5) is provided with a sealed encapsulation shell, and the surface of the detachable phase change cold storage module (5) is provided with an anti-condensation coating.

5. The reusable constant temperature fresh food turnover box according to claim 1, characterized in that: The spiral ventilation regulating valve (8) adopts a spiral three-stage adjustment structure, and the valve body of the spiral ventilation regulating valve (8) has a built-in high-density dustproof and antibacterial filter.

6. The reusable constant temperature fresh food turnover box according to claim 1, characterized in that: The anti-leakage diversion and liquid collection structure includes an inclined diversion channel (9), a liquid collection tank (10), and a water-absorbing sponge. The inclined diversion channel (9) is provided at the bottom of the inner body of the main body (1). The inclined diversion channel (9) is inclined at 3°. The bottom of the main body of the main body (1) at the lower end of the inclined diversion channel (9) is provided with a liquid collection tank (10). The liquid collection tank (10) is provided with a removable water-absorbing sponge inside.

7. The reusable constant temperature fresh food turnover box according to claim 1, characterized in that: The main body (1) of the box is provided with an RFID tag slot (12) on one side. The RFID tag slot (12) is provided with a passive RFID tag. The embedded intelligent tracking module (16) is installed in the intelligent tracking module mounting position by strong double-sided adhesive or nylon Velcro. The intelligent tracking module mounting position is provided with a magnetic charging contact (17) and an RFID antenna window (19). An LED status indicator (20) is provided on the outside of the main body (1) of the box on one side of the embedded intelligent tracking module (16).

8. A method for intelligent tracking temperature control adaptation as described in claim 1, characterized in that: Includes the following steps: S1: Select the corresponding phase change cold storage module according to the type of fresh produce to be stored and transported, complete the freezing and cold storage treatment in advance, and embed the cold storage module into the bottom groove of the box to complete the sealing installation; at the same time, install the embedded intelligent tracking module (16), complete the binding of the module with the cloud platform, and configure the temperature and humidity alarm threshold, tipping detection threshold and positioning frequency parameters. S2: According to the breathing characteristics and preservation requirements of fresh products, adjust the spiral ventilation regulating valve (8) to the corresponding position. There are three ventilation adjustment positions: full sealing position, micro ventilation position, and full ventilation position. The embedded intelligent tracking module (16) starts temperature and humidity collection, collects temperature and humidity data in the box at preset intervals, and uploads them to the cloud platform simultaneously. S3: Close the box lid (2) and fasten the snap-lock (7) to complete the double sealing of the transfer box. The status inside the box is monitored in real time through the transparent observation window (14) and the temperature display. The embedded intelligent tracking module (16) starts positioning tracking and attitude detection simultaneously. The positioning is performed once every 5 minutes in motion. In the static state, the GNSS positioning is turned off and the low power consumption mode is entered. The tilt angle exceeds 45° and triggers a warning. The tilt angle exceeds 60° and triggers an alarm. The event information is reported immediately when there is an impact or fall. S4: During the turnover process, the embedded intelligent tracking module (16) uploads temperature, humidity, positioning and attitude data in real time. In the case of network disconnection, the data is cached in local Flash and automatically re-uploaded after the network is restored. The cloud platform realizes trajectory playback, electronic fence warning and stop point analysis, and monitors the status of turnover boxes in real time. S5: After the turnover is completed, the box is subjected to high-pressure washing and high-temperature disinfection. The detachable phase change cold storage module (5) and water-absorbing sponge on the main body of the box (1) are removed and cleaned separately. The embedded intelligent tracking module (16) is magnetically charged through the magnetic charging contact (17). The accessories are classified and stored for recycling. The identity information of the turnover box and the intelligent tracking module is read in batches through the RFID reader to complete the inventory and asset management of the inbound and outbound warehouses.

9. The intelligent tracking temperature control adaptation method according to claim 8, characterized in that: In step S2, the fully sealed setting maintains the humidity inside the box at 90%-95%, with a constant temperature duration of 24 hours in the 0-4℃ mode and 18 hours in the -18℃ mode; the slightly breathable setting maintains the humidity inside the box at 75%-85%, with a constant temperature duration of 20 hours in the 0-4℃ mode and 15 hours in the -18℃ mode; the fully breathable setting maintains the humidity inside the box at 60%-70%, with a constant temperature duration of 12 hours in the 0-4℃ mode and 8 hours in the -18℃ mode; the embedded intelligent tracking module (16) compares the collected temperature and humidity data with the preset threshold in real time, and triggers an alarm after exceeding the threshold for 5-15 minutes, reporting the abnormal start and end time, location and data information.

10. The intelligent tracking temperature control adaptation method according to claim 8, characterized in that: In step S3, the embedded intelligent tracking module (16) uses GNSS positioning and Bluetooth beacon scanning for coordinated positioning; in step S5, the embedded intelligent tracking module (16) supports remote firmware upgrade via 4G or Bluetooth.

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