Fresh meat cold-chain logistics preservative and fresh-keeping device and fresh-keeping method

Abstract

The invention relates to a fresh meat cold-chain logistics preservative and fresh-keeping device and a fresh-keeping method, and belongs to the technical field of food fresh-keeping. The fresh meat cold-chain logistics preservative and fresh-keeping device comprises a box body with an inner cavity; the separation net is arranged in the box body and is used for separating the inner cavity into a storage cavity and a slow release cavity; the slow-release assembly comprises an under-pressure slow-release air source and a slow-release pipe, one end of the slow-release pipe is communicated with the under-pressure slow-release air source, and the other end of the slow-release pipe penetrates into the slow-release cavity; the box cover is rotationally arranged on the box body; the refrigeration assembly is arranged on the box cover and comprises a first heat dissipation pipe, a semiconductor refrigeration sheet and a second heat dissipation pipe, the hot end of the semiconductor refrigeration sheet is in contact with the first heat dissipation pipe, and the cold end of the semiconductor refrigeration sheet is in contact with the second heat dissipation pipe; the control assembly is electrically connected with the slow release assembly and the refrigeration assembly. The slow release assembly is arranged outside the box body, and the refrigeration assembly is integrated on the box cover, so that modular separation and cooperative control of gas slow release and refrigeration functions are realized, and the fresh-keeping effect is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of food preservation, and in particular to a device and method for preventing and preserving fresh meat in cold chain logistics. Background Technology

[0002] Preservation and freshness of fresh meat during cold chain logistics is a crucial aspect of food transportation. Currently, the industry's commonly used preservation methods mainly rely on single or limited technological means, such as maintaining a low-temperature environment through refrigeration systems to inhibit microbial activity, or combining auxiliary measures such as modified atmosphere packaging and vacuum packaging to improve the gas composition within the packaging.

[0003] Currently, most existing devices have a single function or a simple stacked structure design. For example, the refrigeration module and the gas control module are independent of each other, lacking system integration and intelligent coordination. This results in the inability to achieve a dynamic balance between temperature and gas environment inside the container, limiting the preservation effect. At the same time, the structural layout of traditional devices often occupies a lot of effective loading space, reducing the loading efficiency of logistics transportation.

[0004] Therefore, a new preservation device is urgently needed. Summary of the Invention

[0005] To address the problem that existing cold chain equipment often employs separate refrigeration and gas handling units, resulting in limited preservation effects, this application provides a fresh meat cold chain logistics anti-corrosion and preservation device and method.

[0006] Firstly, this application provides a cold chain logistics preservation and anti-corrosion device for fresh meat, employing the following technical solution: A cold chain logistics device for preserving and preventing spoilage of fresh meat includes: The enclosure has an inner cavity, and the enclosure includes a protective layer, an insulation layer and a reinforcement layer arranged sequentially. An isolation net is installed inside the box and is used to divide the inner cavity into a storage cavity and a slow-release cavity. The storage cavity is used to place materials, and the slow-release cavity is used to release a mixture of carbon dioxide and nitrogen gas. A slow-release component is disposed outside the housing. The slow-release component includes a pressurized slow-release gas source and a slow-release tube. One end of the slow-release tube is connected to the pressurized slow-release gas source, and the other end is inserted into the slow-release chamber. The lid is rotatably mounted on the box body on one side, and the lid includes a protective layer, an insulation layer and a reinforcing layer arranged in sequence. The cooling assembly includes a first heat sink, a thermoelectric cooler, and a second heat sink. The first heat sink is located on the outer surface of the lid, and the second heat sink is located on the inner surface of the lid. The thermoelectric cooler is embedded in the insulation layer of the lid. The hot end of the thermoelectric cooler contacts the first heat sink, and the cold end of the thermoelectric cooler contacts the second heat sink. The control assembly includes a controller and an operation panel, wherein the controller is electrically connected to the slow-release assembly, the cooling assembly and the operation panel, and the operation panel is disposed on the outer side of the housing.

[0007] By adopting the above technical solution, the slow-release component is placed on the outside of the box and the refrigeration component is integrated into the box cover, realizing the modular separation and coordinated control of gas slow release and refrigeration functions; the isolation net divides the inner cavity into a storage cavity and a slow-release cavity, which allows the mixed gas to diffuse slowly and evenly into the storage space, avoiding damage to meat products caused by excessively high local gas concentration or sudden pressure changes; the use of semiconductor refrigeration chips combined with heat dissipation pipes results in a compact structure and fast refrigeration response, making it suitable for small and medium-sized cold chain equipment.

[0008] Optionally, one outer side of the housing is recessed to form a storage cavity, and the slow-release assembly further includes: The slow-release plate is detachably fixed to the opening of the storage cavity; Two high-pressure gas cylinders are placed inside the storage cavity, and the two high-pressure gas cylinders are respectively filled with carbon dioxide gas and nitrogen gas. A slow-release chamber is disposed within the storage cavity. The slow-release chamber is connected to the high-pressure gas cylinder via two independent pipelines. The slow-release chamber is used to form a mixed gas of carbon dioxide and nitrogen. Two proportional valves are respectively installed on the pipeline connecting the high-pressure gas cylinder and the slow-release chamber; An air pump is installed on the slow-release chamber and connected to the air inlet of the slow-release tube. The air pump is used to fill the mixed gas in the slow-release chamber into the storage cavity.

[0009] By adopting the above technical solution, the storage cavity and the detachable slow-release plate form a modular gas supply unit, which facilitates the replacement and maintenance of high-pressure gas cylinders; the high-pressure gas cylinder, together with the proportional valve, achieves a precise ratio of carbon dioxide and nitrogen, improving the stability of gas preservation effect; the gas pump assists in gas delivery, ensuring that the gas can effectively enter the slow-release cavity and is not affected by external air pressure fluctuations.

[0010] Optionally, the slow-release assembly further includes an alignment tube and a sealing ring. The alignment tube is located between the air pump and the slow-release tube. One end of the alignment tube is connected to the air outlet of the air pump, and the other end is connected to the air inlet of the slow-release tube via the sealing ring.

[0011] By adopting the above technical solution, the positive tube and sealing ring ensure an airtight connection between the air pump and the slow-release tube, preventing gas leakage and improving system reliability.

[0012] Optionally, the slow-release plate has a positioning protrusion, and the side of the housing facing the slow-release plate has a positioning groove, into which the positioning protrusion can pass.

[0013] By adopting the above technical solutions, the slow-release plate can be positioned quickly and accurately, simplifying the installation process and improving assembly efficiency and consistency.

[0014] Optionally, the slow-release component further includes a fixing block, on which a fixing groove is formed, and the high-pressure gas cylinder is inserted into the fixing groove.

[0015] By adopting the above technical solutions, the shaking or collision of high-pressure gas cylinders during transportation is avoided, thereby improving the overall safety and structural stability of the device.

[0016] Optionally, the cooling assembly further includes a cooling fan disposed on the outer surface of the cover and facing the first heat dissipation pipe.

[0017] By adopting the above technical solution, the heat dissipation efficiency of the first heat sink is enhanced, ensuring timely heat dissipation at the hot end of the semiconductor cooling chip and maintaining stable cooling performance.

[0018] Optionally, the refrigeration assembly further includes a first protective net, and a heat dissipation groove is provided on the outer side of the cover. The first heat dissipation pipe and the heat dissipation fan are located in the heat dissipation groove, and the first protective net is disposed at the opening of the heat dissipation groove.

[0019] By adopting the above technical solution, external foreign objects are prevented from entering the heat dissipation structure, protecting the first heat dissipation pipe and fan, and extending the service life of the cooling components.

[0020] Optionally, the refrigeration assembly further includes a second protective net, and a refrigeration groove is provided on the inner side of the cover. The second protective net is disposed at the opening of the refrigeration groove and is made of the same material as the reinforcing layer. The second heat dissipation pipe is located in the refrigeration groove.

[0021] By adopting the above technical solution, items inside the storage cavity are prevented from contacting the second heat dissipation pipe, avoiding contamination or frost that could affect the cooling effect, while keeping the inner wall smooth and easy to clean.

[0022] Optionally, it also includes a handle and wheels, with the handle located on the side of the lid and the wheels located on the bottom of the box.

[0023] By adopting the above technical solutions, the ease of moving and handling the device is improved, making it suitable for logistics loading and unloading and short-distance transfer scenarios, thus enhancing its practicality.

[0024] Secondly, this application also provides a method for preventing and preserving fresh meat in cold chain logistics, employing the following technical solution: A method for preventing and preserving fresh meat in cold chain logistics includes the following steps: S1. Open the lid and place the fresh materials in the storage cavity, then close the lid. S2. Start the cooling component through the operation panel, set and control the temperature of the storage cavity within a preset low temperature range. When the cooling component is working, the cold end of the semiconductor cooling chip cools the storage cavity through the second heat dissipation pipe, and the hot end dissipates the heat to the outside of the box through the first heat dissipation pipe and the cooling fan. S3. The controller controls two proportional valves to release gas from two high-pressure gas cylinders according to a preset ratio (e.g., the volume ratio of carbon dioxide to nitrogen is 7:3), and mix them in the slow-release chamber; then, the gas pump pumps the mixed gas into the slow-release chamber through the slow-release tube. S4. After the mixed gas enters the slow-release chamber, it diffuses slowly and evenly into the storage chamber under pressure through the isolation net; finally, a preservation gas environment rich in carbon dioxide and low in oxygen is formed and maintained in the storage chamber. S5. During logistics and transportation, the refrigeration components work continuously to maintain the low temperature inside the box; at the same time, the slow-release components replenish the mixed gas to the storage cavity in an intermittent or low-speed continuous mode according to the preset program. S6. Upon arrival at the destination, first turn off the slow-release and refrigeration components via the control panel, then open the lid and take out the well-preserved fresh meat and food.

[0025] By adopting the above technical solution, and through step-by-step control of refrigeration start-up and gas slow release, the low temperature and controlled atmosphere environment can be established and maintained in synergy. The gas replenishment mode can be dynamically adjusted according to the transportation time and the condition of the meat products, flexibly adapting to different preservation needs.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By integrating the refrigeration unit into the cover and centrally arranging the gas slow-release components in an independent chamber on the side of the enclosure, this device greatly optimizes the utilization of internal space while ensuring complete functionality. At the same time, the detachable slow-release plate and modular gas path design make it easier to replace gas cylinders, clean the system, and repair components, reducing maintenance costs and downtime, making it suitable for high-frequency, fast-turnover logistics scenarios.

[0027] 2. Carbon dioxide has a significant antibacterial effect, especially against aerobic spoilage bacteria and molds, effectively delaying meat spoilage caused by microorganisms. Nitrogen, as an inert gas, not only replaces oxygen in the packaging, reducing the oxidation rate, but also maintains the packaging structure, preventing meat from deforming due to vacuum pressure or excessive leakage of juices. When used in a specific ratio (7:3), the two can inhibit microorganisms while minimizing oxidative spoilage, achieving a synergistic effect of antibacterial and antioxidant properties, and comprehensively improving the hygiene, safety, and sensory quality of the meat. Attached Figure Description

[0028] Figure 1 This is an isometric schematic diagram of the preservation device provided in the embodiments of this application; Figure 2 yes Figure 1 A schematic diagram of the structure after rotating the first angle; Figure 3 yes Figure 1 A schematic diagram of the structure with the slow-release plate hidden; Figure 4 yes Figure 3 Front view; Figure 5 This is a schematic diagram of the internal structure of the box provided in this application; Figure 6 yes Figure 5 A schematic diagram of the structure after rotating by one angle; Figure 7 This is a schematic diagram of the structure of the sustained-release component in this application; Figure 8 This is a structural schematic diagram of the mating point between the lid and the refrigeration component provided in this application; Figure 9 yes Figure 8 A structural diagram showing the structure behind the first protective netting; Figure 10 yes Figure 8 A schematic diagram of the structure after rotating by an angle; Figure 11 yes Figure 10 A structural diagram showing the structure after the second protective netting has been concealed; Figure 12 This is a cross-sectional view of the mating area between the box cover and the refrigeration component in this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Isolation net; 3. Slow-release tube; 4. Housing cover; 5. First heat dissipation tube; 6. Semiconductor cooling chip; 7. Second heat dissipation tube; 8. Control panel; 9. Slow-release plate; 10. High-pressure gas cylinder; 11. Slow-release chamber; 12. Proportional valve; 13. Air pump; 14. Alignment tube; 15. Positioning protrusion; 16. Fixing block; 17. Cooling fan; 18. First protective net; 19. Second protective net; 20. Handle; 21. Wheels; 22. Pressure sensor; 23. Temperature sensor. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-12 This application will be described in further detail.

[0031] This application discloses a cold chain logistics anti-corrosion and preservation device for fresh meat, including a box body 1, an isolation net 2, a slow-release component, a box cover 4, a refrigeration component, and a control component.

[0032] See Figures 5 to 6 The container 1 has an inner cavity, and an isolation net 2 is installed in the inner cavity, dividing the inner cavity into an interconnected storage cavity and a slow-release cavity. The storage cavity is used to store fresh materials, and the slow-release cavity is used to supply the storage cavity with a mixture of carbon dioxide and nitrogen (mixing ratio of 7:3).

[0033] See Figures 1 to 4 The lid 4 is rotatably connected to the body 1 via a hinge on one side. The lid 4 and the body 1 are made of the same material, both consisting of an outer protective layer, a middle insulation layer, and an inner reinforcing layer. The protective layer is made of aluminum alloy, the insulation layer is made of polyurethane foam, and the reinforcing layer is made of food-grade stainless steel.

[0034] See Figures 1 to 4 One side of the housing 1 is recessed inward to form a storage cavity. Except for the slow-release tube 3, all other components of the slow-release assembly are located inside the storage cavity. The slow-release assembly includes the slow-release tube 3, the slow-release plate 9, the high-pressure gas cylinder 10, the slow-release chamber 11, the proportional valve 12, the air pump 13, the alignment tube 14, the sealing ring, and the ceramic breathable membrane.

[0035] See Figures 1 to 4 , Figure 7The slow-release plate 9 is detachably connected to the opening of the storage cavity. The slow-release tube 3 passes through the housing 1, with its air inlet located inside the storage cavity. The main part of the slow-release tube 3 is located inside the slow-release cavity. There are two high-pressure gas cylinders 10, one containing carbon dioxide gas and the other containing nitrogen gas. The slow-release chamber 11 is connected to the slow-release plate 9, and there is a connecting pipe between the slow-release chamber 11 and the high-pressure gas cylinder 10. There are two proportional valves 12, which are installed in a one-to-one correspondence on the connecting pipe between the slow-release chamber 11 and the high-pressure gas cylinder 10. The air pump 13 is installed on the slow-release chamber 11, and the air pump 13 is connected to the slow-release tube 3 via an alignment pipe 14, which is located inside the storage cavity. By fixing all the accessories of the slow-release assembly except for the slow-release tube 3 to the slow-release plate 9, a modular structure can be formed, which can be easily replaced and maintained.

[0036] The air pump 13 is a miniature air pump 13, meaning that the air pump 13 and the motor are integrated into one structure.

[0037] To further enhance the slow release effect of the mixed gas, a ceramic breathable membrane is fitted over the outside of the slow-release tube 3. The average pore size of the ceramic breathable membrane is 0.1 μm to 0.5 μm, and the porosity is 30% to 50%. The main material of the ceramic breathable membrane is α-alumina. The presence of the ceramic breathable membrane allows the air pressure inside the storage cavity to increase slowly, preventing rapid pressure rise that could damage the preserved food.

[0038] The slow-release plate 9 is fixed to the housing 1 by bolt connection. To facilitate installation, a positioning protrusion 15 is provided on the slow-release plate 9, and a positioning groove is opened at the corresponding position on the housing 1. The positioning protrusion 15 can be inserted into the positioning groove to complete the positioning of the slow-release plate 9 on the housing 1. After positioning, the axis of the reserved light hole on the slow-release plate 9 and the threaded hole on the housing 1 coincide. At this time, only bolts need to be inserted to fix the slow-release plate 9 and the housing 1.

[0039] See Figures 5 to 6 In addition, the slow-release assembly also includes a pressure sensor 22, which is disposed in the slow-release chamber and used to sense the pressure inside the chamber. The pressure sensor is electrically connected to the controller.

[0040] See Figures 1 to 3 Since the housing 1 will move as necessary, in order to improve the stability of the high-pressure gas cylinder 10 during the movement, a fixing block 16 is set in the storage cavity. The fixing block 16 is fixed to the housing 1 by welding. A fixing groove is opened on the outer side of the fixing block 16. The cylinder body of the high-pressure gas cylinder 10 can be inserted into the fixing groove. The two are in a snap-fit ​​form.

[0041] See Figures 8 to 12The cooling assembly includes a first heat sink 5, a thermoelectric cooler 6, a second heat sink 7, a cooling fan 17, a first protective mesh 18, and a second protective mesh 19. A heat dissipation groove is formed on the outer side of the cover 4, within which the first heat sink 5 and the cooling fan 17 are located. The cooling fan 17 is electrically connected to a controller and faces the first heat sink 5. The first protective mesh 18 is detachably fixed to the opening of the heat dissipation groove. A cooling groove is formed on the inner side of the cover 4, within which the second heat sink 7 is located. The second protective mesh 19 is detachably fixed to the opening of the cooling groove. The thermoelectric cooler 6 is located inside the cover 4, with its hot end contacting the first heat sink 5 and its cold end contacting the second heat sink 7. Furthermore, the cooling power of the thermoelectric cooler 6 is selected to be 50-150W, and under rated operating conditions, the maximum temperature difference between the hot and cold ends of the thermoelectric cooler is above 60 degrees Celsius.

[0042] Both the first heat sink 5 and the second heat sink 7 are arranged in a serpentine "S" bend, which can improve the heat exchange efficiency of the first heat sink 5 and the second heat sink 7. At the same time, placing the semiconductor cooling chip 6 on the cover 4 is more conducive to heat exchange inside the cabinet 1.

[0043] The first protective net 18 and the second protective net 19 are set up so that the heat exchange between the first heat dissipation pipe 5 and the second heat dissipation pipe 7 can be completed, and the first heat dissipation pipe 5 and the second heat dissipation pipe 7 can be prevented from being impacted by the outside.

[0044] It should be noted that the heat dissipation groove is located inside the protective layer of the cover 4, and the cooling groove is located inside the reinforcing layer of the cover 4. The hot end and cold end of the thermoelectric cooler 6 both protrude to the outside of the insulation layer. The hot end of the thermoelectric cooler 6 passes through to the end of the first heat dissipation pipe 5, and similarly, the cold end of the thermoelectric cooler 6 passes through to the end of the second heat dissipation pipe 7.

[0045] See Figures 5 to 6 To achieve precise temperature control and monitoring, the refrigeration assembly also includes a temperature sensor 23, which is located inside the slow-release chamber and electrically connected to the controller. The temperature controller 23 is used to monitor the temperature inside the housing 1.

[0046] To improve the convenience of the anti-corrosion and preservation device, a handle 20 is provided on the side of the lid 4. At the same time, multiple casters 21 are provided at the bottom of the body 1. The casters 21 are self-locking casters.

[0047] This application also discloses a method for preventing and preserving fresh meat in cold chain logistics.

[0048] A method for preventing and preserving fresh meat in cold chain logistics includes the following steps: S1. Open the lid 4 and place the fresh materials in the storage cavity, then close the lid 4.

[0049] After opening the lid 4, neatly place the pre-packaged or unpackaged fresh meat (such as whole pieces of meat, cut meat, meat products, etc.) into the storage cavity. A special tray or rack can be used as needed to maintain a certain distance between the meat and the isolation net 2, facilitating air circulation. After placement, ensure the lid 4 is completely closed and that the interior space is airtight.

[0050] S2. Start the cooling component through the operation panel 8, set and control the temperature of the storage cavity within a preset low temperature range. When the cooling component is working, the cold end of the semiconductor cooling chip 6 cools the storage cavity through the second heat dissipation pipe 7, and the hot end dissipates heat to the outside of the box through the first heat dissipation pipe 5 and the cooling fan 17.

[0051] The preset low temperature range is usually set to 0℃~4℃ (for chilled meat) or -2℃~0℃ (for fresh meat). After the semiconductor cooling chip 6 is powered on, the cold end quickly absorbs the heat in the storage cavity through the second heat dissipation pipe 7; the heat generated by the hot end is discharged through the first heat dissipation pipe 5 and forced to be discharged to the external environment by the cooling fan 17.

[0052] S3. The controller controls two proportional valves 12 to release gas from two high-pressure gas cylinders 10 according to a preset ratio (e.g., the volume ratio of carbon dioxide to nitrogen is 7:3), and mix them in the slow-release chamber 11; then, the gas pump 13 pumps the mixed gas into the slow-release chamber through the slow-release tube 3.

[0053] The proportional valve 12 receives the controller signal and precisely controls the release flow of CO2 and N2 according to the set ratio. The gas is initially mixed in the slow release chamber 11. After the gas pump 13 is started, the mixed gas is transported to the slow release chamber through the slow release pipe 3.

[0054] S4. After the mixed gas enters the slow-release chamber, it diffuses slowly and evenly into the storage chamber under pressure through the isolation net 2; finally, a preservation gas environment rich in carbon dioxide and low in oxygen is formed and maintained in the storage chamber.

[0055] The isolation mesh 2 has an appropriate porosity, which allows gas to slowly permeate into the storage cavity under pressure difference, preventing airflow from directly impacting the surface of the meat.

[0056] S5. During logistics and transportation, the refrigeration components work continuously to maintain the low temperature inside the box; at the same time, the slow-release components replenish the mixed gas to the storage cavity in an intermittent or low-speed continuous mode according to the preset program.

[0057] The refrigeration unit operates continuously or intermittently based on temperature feedback to ensure the internal temperature remains stable within the set range. The gas replenishment mode can be adjusted according to the transportation duration and the initial state of the meat. For example, replenishment can be done every 2-4 hours to compensate for gas leakage or meat respiration and maintain a stable gas environment.

[0058] S6. After arriving at the destination, first turn off the slow-release component and the refrigeration component through the operation panel 8, then open the lid 4 and take out the fresh meat and food that has been kept in good condition.

[0059] After the system is shut down, the air pressure inside the box gradually equalizes. Before opening the lid, it can be left to stand for a short time to allow the gas to dissipate naturally. After removing the meat, the inside of the box can be cleaned and disinfected in preparation for the next use.

[0060] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cold chain logistics anti-corrosion and preservation device for fresh meat, characterized in that, include: The box (1) has an inner cavity, and the box (1) includes a protective layer, an insulation layer and a reinforcement layer arranged in sequence; An isolation net (2) is provided inside the box (1) and is used to divide the inner cavity into a storage cavity and a slow-release cavity. The storage cavity is used to place materials, and the slow-release cavity is used to release a mixture of carbon dioxide and nitrogen. The slow-release component is disposed outside the housing (1). The slow-release component includes a pressurized slow-release gas source and a slow-release tube (3). One end of the slow-release tube (3) is connected to the pressurized slow-release gas source, and the other end is inserted into the slow-release chamber. The lid (4) is rotatably mounted on the box body (1) on one side. The lid (4) includes a protective layer, an insulation layer and a reinforcing layer arranged in sequence. The cooling assembly includes a first heat sink (5), a semiconductor cooling chip (6), and a second heat sink (7). The first heat sink (5) is located on the outer surface of the cover (4), and the second heat sink (7) is located on the inner surface of the cover (4). The semiconductor cooling chip (6) is embedded in the insulation layer of the cover (4). The hot end of the semiconductor cooling chip (6) contacts the first heat sink (5), and the cold end of the semiconductor cooling chip (6) contacts the second heat sink (7). The control component includes a controller and an operation panel (8), wherein the controller is electrically connected to the slow-release component, the cooling component and the operation panel (8), and the operation panel (8) is disposed on the outer side of the housing (1).

2. The fresh meat cold chain logistics anti-corrosion and preservation device according to claim 1, characterized in that: The outer side of the housing (1) is recessed to form a storage cavity, and the slow-release assembly further includes: The slow-release plate (9) is detachably fixed at the opening of the storage cavity; Two high-pressure gas cylinders (10) are placed in the storage cavity, and the two high-pressure gas cylinders (10) are respectively filled with carbon dioxide gas and nitrogen gas; A slow-release chamber (11) is provided in the storage cavity. The slow-release chamber (11) is connected to the high-pressure gas cylinder (10) by two independent pipelines. The slow-release chamber (11) is used to form a mixed gas of carbon dioxide and nitrogen. Two proportional valves (12) are respectively installed on the pipeline connecting the high-pressure gas cylinder (10) and the slow-release chamber (11); An air pump (13) is installed on the slow-release chamber (11) and connected to the air inlet of the slow-release tube (3). The air pump (13) is used to fill the mixed gas in the slow-release chamber (11) into the storage cavity.

3. The fresh meat cold chain logistics anti-corrosion and preservation device according to claim 2, characterized in that: The slow-release assembly also includes an alignment tube (14) and a sealing ring. The alignment tube (14) is located between the air pump (13) and the slow-release tube (3). One end of the alignment tube (14) is connected to the air outlet of the air pump (13), and the other end is connected to the air inlet of the slow-release tube (3) through the sealing ring.

4. The fresh meat cold chain logistics anti-corrosion and preservation device according to claim 3, characterized in that: The slow-release plate (9) has a positioning protrusion (15), and the box (1) has a positioning groove on the side facing the slow-release plate (9), and the positioning protrusion (15) can be inserted into the positioning groove.

5. The fresh meat cold chain logistics anti-corrosion and preservation device according to claim 4, characterized in that: The slow-release component also includes a fixing block (16), on which a fixing groove is provided, and the high-pressure gas cylinder (10) is inserted into the fixing groove.

6. The fresh meat cold chain logistics anti-corrosion and preservation device according to claim 1, characterized in that: The cooling assembly also includes a cooling fan (17), which is disposed on the outer side of the cover (4) and faces the first heat dissipation pipe (5).

7. The fresh meat cold chain logistics anti-corrosion and preservation device according to claim 6, characterized in that: The refrigeration assembly also includes a first protective net (18), and a heat dissipation groove is provided on the outer side of the cover (4). The first heat dissipation pipe (5) and the heat dissipation fan (17) are located in the heat dissipation groove, and the first protective net (18) is provided at the opening of the heat dissipation groove.

8. The fresh meat cold chain logistics anti-corrosion and preservation device according to claim 7, characterized in that: The refrigeration assembly also includes a second protective net (19). The inner side of the cover (4) is provided with a refrigeration groove. The second protective net (19) is located at the opening of the refrigeration groove and is made of the same material as the reinforcement layer. The second heat dissipation pipe (7) is located in the refrigeration groove.

9. The cold chain logistics preservation and anti-corrosion device for fresh meat according to any one of claims 1-8, characterized in that: It also includes a handle (20) and wheels (21), the handle (20) being located on the side of the box cover (4) and the wheels (21) being located at the bottom of the box body (1).

10. A method for preventing and preserving fresh meat in cold chain logistics, applied to the fresh meat cold chain logistics preservation device according to any one of claims 1-9, characterized in that: Includes the following steps: S1. Open the box lid (4) and place the fresh materials in the storage cavity, then close the box lid (4). S2. Start the cooling component through the operation panel (8) to set and control the temperature of the storage cavity within a preset low temperature range. When the cooling component is working, the cold end of the semiconductor cooling chip (6) cools the storage cavity through the second heat dissipation pipe (7), and the hot end dissipates the heat to the outside of the box through the first heat dissipation pipe (5) and the cooling fan (17). S3. The controller controls two proportional valves (12) to release gas from two high-pressure gas cylinders (10) according to a preset ratio (e.g., the volume ratio of carbon dioxide to nitrogen is 7:3) and mix them in the slow-release chamber (11); then, the gas pump (13) pumps the mixed gas into the slow-release chamber through the slow-release tube (3); S4. After the mixed gas enters the slow-release chamber, it diffuses slowly and evenly into the storage chamber through the isolation net (2) under pressure; finally, a preservation gas environment rich in carbon dioxide and low in oxygen is formed and maintained in the storage chamber. S5. During logistics and transportation, the refrigeration components work continuously to maintain the low temperature inside the box; at the same time, the slow-release components replenish the mixed gas to the storage cavity in an intermittent or low-speed continuous mode according to the preset program. S6. After arriving at the destination, first turn off the slow-release component and the refrigeration component through the operation panel (8), then open the box cover (4) and take out the fresh meat and food that is well preserved.

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