Food fresh-keeping system based on liquid nitrogen

Abstract

The invention provides a liquid nitrogen-based food fresh-keeping system, which belongs to the technical field of liquid nitrogen instant freezers, and comprises a fresh-keeping mechanism, the fresh-keeping mechanism comprises a cabinet body and a tank body, the cabinet body is connected with a protective door through a rotating shaft, a locking part for sealing the cabinet body is arranged on the side wall of the cabinet body, a partition plate is arranged in the cabinet body, and a fan and an air outlet are arranged on the partition plate; a fresh-keeping part for guiding atomized liquid nitrogen to flow is arranged on the partition plate, and a supporting part is arranged in the cabinet body; the adjusting mechanism comprises a penetrating opening formed in the safety part, a sealing part is arranged in the penetrating opening, a storage part and a limiting part are arranged on the supporting part, and an adjusting part is arranged on the limiting part; the auxiliary mechanism comprises a first fixing sleeve and a second fixing sleeve which are arranged in the cabinet body, a pushing part is arranged on the first fixing sleeve, a lifting part is arranged on the second fixing sleeve, and a guiding part is arranged on the lifting part. Through the arrangement of the fresh-keeping mechanism, the adjusting mechanism and the auxiliary mechanism, products in the cabinet body are quickly frozen accurately.

Description

Technical Field

[0001] This invention belongs to the field of liquid nitrogen quick-freezing technology, specifically relating to a liquid nitrogen-based food preservation system. Background Technology

[0002] Liquid nitrogen quick-freezing machines use ultra-low temperature liquid nitrogen at -196℃ as the refrigerant. They achieve rapid freezing through direct contact heat exchange. When using a vertical liquid nitrogen quick-freezing cabinet to quick-freeze products, air is forced out from the side air ducts, passes through the liquid nitrogen spray nozzle, and evenly disperses the atomized liquid nitrogen throughout the cabinet. Finally, it flows back to the fan to form a closed loop, completing the quick-freezing of the products.

[0003] Currently, vertical liquid nitrogen quick-freezing cabinets cannot accurately freeze products based on their position inside the cabinet, resulting in low freezing efficiency and potential waste of atomized liquid nitrogen. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid nitrogen-based food preservation system, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A liquid nitrogen-based food preservation system includes: a preservation mechanism comprising a cabinet and a tank; the cabinet is connected to a protective door via a pivot; a locking part for sealing the cabinet is provided on the side wall of the cabinet; a partition plate is provided inside the cabinet; a fan and an air outlet are provided on the partition plate; a preservation part for guiding the flow of atomized liquid nitrogen is provided on the partition plate; and a support part is provided inside the cabinet; an adjustment mechanism including a through-hole provided on the protective part; a sealing part provided inside the through-hole; a storage part and a limiting part provided on the support part; and an adjustment part provided on the limiting part; and an auxiliary mechanism including a first fixed sleeve and a second fixed sleeve provided inside the cabinet; a pushing part provided on the first fixed sleeve; a lifting part provided on the second fixed sleeve; and a guiding part provided on the lifting part.

[0006] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the locking part includes a first base disposed on the side wall of the cabinet, a threaded rod disposed on the first base, a rotating wheel disposed on the threaded rod, and a second base disposed on the protective door.

[0007] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the preservation section includes a horizontal tube disposed on the partition plate, and a first strip-shaped opening is provided on the side wall of the horizontal tube.

[0008] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the support part includes a slide rail disposed inside the cabinet body, a roller disposed on the slide rail, a frame disposed on the roller, and a support plate and a baffle disposed on the frame.

[0009] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the sealing part includes a T-shaped plate disposed inside the through-hole, and the T-shaped plate is provided with a second strip-shaped opening.

[0010] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the storage part includes a storage plate disposed on the support plate, and the storage plate is provided with a first cut surface and a second cut surface.

[0011] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the limiting part includes a limiting rod disposed on the support plate, and the limiting rod is provided with a limiting ring and a fixing plate; the adjusting part includes a lifting plate disposed on the side wall of the limiting rod, and the lifting plate is provided with a groove.

[0012] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the pushing part includes a long rod disposed on the first fixed sleeve, a trapezoidal block disposed on the long rod, and a trapezoidal groove disposed on the T-shaped plate.

[0013] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the lifting unit includes a U-shaped frame disposed on the second fixed sleeve, and a telescopic tube is provided on the top of the U-shaped frame.

[0014] As a preferred embodiment of the liquid nitrogen food preservation system of the present invention, the guide part includes a guide rod disposed on the U-shaped frame, a fixing block is installed on the long rod, and a guide groove is provided on the fixing block.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the design of preservation, adjustment and auxiliary mechanisms, the atomized liquid nitrogen can be distributed more evenly inside the cabinet, avoiding waste of atomized liquid nitrogen. It can be used for quick freezing according to the specific location of the product, ensuring the quick freezing efficiency of the product.

[0016] 2. The first slot can be opened at different heights according to the size of the product, so as to carry out sufficient quick-freezing treatment for products of different sizes and ensure the quick-freezing efficiency of the products. After the quick-freezing treatment of the products is completed, the staff can quickly close the first slot to avoid wasting atomized liquid nitrogen. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a liquid nitrogen-based food preservation system; Figure 2 This is a schematic diagram of the internal structure of a cabinet in a liquid nitrogen-based food preservation system. Figure 3 This is a cross-sectional schematic diagram of the cabinet in a liquid nitrogen-based food preservation system; Figure 4 This is a schematic diagram of a partition plate in a liquid nitrogen-based food preservation system. Figure 5 This is a schematic diagram of a shelf in a liquid nitrogen-based food preservation system.

[0019] Figure 6 This is a schematic diagram of a support plate in a liquid nitrogen-based food preservation system.

[0020] Figure 7 This is a schematic diagram of the contact between the lifting plate and the T-shaped plate in a liquid nitrogen-based food preservation system.

[0021] Figure 8 This is a partially enlarged schematic diagram of the lifting plate in a liquid nitrogen-based food preservation system.

[0022] Figure 9 This is a schematic diagram showing the separation of the storage plate and the lifting plate in a liquid nitrogen-based food preservation system.

[0023] Figure 10 This is a schematic diagram of a cutting groove in a liquid nitrogen-based food preservation system.

[0024] Figure 11 This is a schematic diagram of the trapezoidal block and trapezoidal groove in a liquid nitrogen-based food preservation system.

[0025] Figure 12 This is a schematic diagram of a fixed block in a liquid nitrogen-based food preservation system.

[0026] In the diagram: 10. Cabinet; 11. Tank; 12. Protective door; 13. Locking part; 131. First base; 132. Threaded rod; 133. Rotary wheel; 134. Second base; 14. Divider plate; 15. Fan; 16. Air outlet; 17. Freshness preservation section; 171. Horizontal tube; 172. First strip opening; 18. Support part; 181. Slide rail; 182. Roller; 183. Frame; 184. Support plate; 185. Baffle plate; 20. Through-hole; 21. Sealing part; 211. T-shaped plate; 212. Second strip-shaped opening; 22. Storage part; 221. Storage plate; 222. First cut surface; 223. Second cut surface; 23. Limiting part; 231. Limiting rod; 232. Limiting ring; 233. Fixing plate; 24. Adjusting part; 241. Lifting plate; 242. Groove; 30. First fixed sleeve; 31. Second fixed sleeve; 32. Pushing part; 321. Long rod; 322. Trapezoidal block; 323. Trapezoidal groove; 33. Lifting part; 331. U-shaped frame; 332. Telescopic tube; 34. Guide part; 341. Guide rod; 342. Fixed block; 343. Guide groove. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Example 1 Reference Figure 1 - Figure 12 This is the first embodiment of the present invention. This embodiment provides a liquid nitrogen-based food preservation system, which includes a preservation mechanism, an adjustment mechanism and an auxiliary mechanism, so that the gas flow inside the liquid nitrogen quick-freezing machine is more stable, the products inside the liquid nitrogen quick-freezing machine are precisely preserved, the quick-freezing efficiency of liquid nitrogen on products is improved, and at the same time, the contact amount between liquid nitrogen and products can be selected according to the size of the products to ensure the quick-freezing efficiency of the products and reduce the loss of atomized liquid nitrogen.

[0029] Furthermore, the preservation mechanism can guide the flow of atomized liquid nitrogen to improve the utilization rate of atomized liquid nitrogen for quick freezing of products inside the cabinet 10. It includes a cabinet 10 and a tank 11, which are connected by a gas pipeline, allowing the atomized liquid nitrogen inside the tank 11 to enter the cabinet 10. The cabinet 10 is connected to a protective door 12 via a pivot. A locking part 13 for sealing the cabinet 10 is provided on the side wall of the cabinet 10. A partition plate 14 is provided inside the cabinet 10, dividing the interior of the cabinet 10 into a first chamber and a second chamber. Products are placed inside the first chamber. A fan 15 and an air outlet 16 are provided on the partition plate 14. A preservation part 17 for guiding the flow of atomized liquid nitrogen is provided on the partition plate 14. A support part 18 is provided inside the cabinet 10.

[0030] When in use, the staff opens the valve on tank 11, and the atomized liquid nitrogen inside tank 11 enters the interior of cabinet 10 through the gas delivery pipe.

[0031] Furthermore, the locking part 13 includes a first base 131 disposed on the side wall of the cabinet 10, a threaded rod 132 disposed on the first base 131, a rotating wheel 133 disposed on the threaded rod 132, and a second base 134 disposed on the protective door 12.

[0032] It should be noted that when the protective door 12 closes the entrance and exit of the cabinet 10, the first base 131 and the second base 134 are aligned. At this time, the staff drives the rotating wheel 133 to rotate the threaded rod 132, and threadedly connects the threaded rod 132 with the first base 131 and the second base 134, thereby sealing the cabinet 10 through the protective door 12.

[0033] Furthermore, the preservation section 17 includes a horizontal tube 171 disposed on the partition plate 14. The horizontal tube 171 is interconnected with the air outlet 16. There are multiple horizontal tubes 171, which are divided into two groups. The two groups of horizontal tubes 171 are located on both sides of the partition plate 14 respectively. A first strip-shaped opening 172 is provided on the side wall of the horizontal tube 171.

[0034] During use, when the atomized liquid nitrogen inside the tank 11 enters the cabinet 10, the fan 15 inside the cabinet 10 rotates, which drives the atomized liquid nitrogen through the air outlet 16 into the horizontal tube 171. The atomized liquid nitrogen that enters the horizontal tube 171 is discharged through the first strip-shaped port 172, which quickly freezes the products in the first chamber. At the same time, the remaining atomized liquid nitrogen after contact with the products is sent back into the second chamber by the fan 15. Under the action of the fan 15, the new and old atomized liquid nitrogen enter the horizontal tube 171 together through the air outlet 16 and continue to be discharged through the first strip-shaped port 172. This process is repeated to complete the quick freezing of the products, making the temperature distribution inside the cabinet 10 more uniform and ensuring that the products in the freezing tray are frozen to a consistent degree.

[0035] Furthermore, the support part 18 includes a slide rail 181 disposed inside the cabinet 10, a roller 182 disposed on the slide rail 181, the roller 182 being located inside the slide rail 181, a frame 183 disposed on the roller 182, a support plate 184 and a baffle 185 disposed on the frame 183, the baffle 185 being located between the support plate 184 and the partition plate 14, and the support plate 184 being located below the first strip opening 172.

[0036] It should be noted that there are multiple support plates 184 and multiple baffles 185, and the support plates 184 and baffles 185 correspond one-to-one, with the multiple support plates 184 evenly distributed from top to bottom.

[0037] When in use, the staff first places the product on the support plate 184 on the outside of the cabinet 10. Then, the staff puts the frame 183 into the inside of the cabinet 10, so that the roller 182 is on the slide rail 181. Pushing the frame 183, the roller 182 drives the frame 183 to move inside the cabinet 10 until the frame 183 is completely placed inside the cabinet 10.

[0038] Furthermore, the adjustment mechanism can control whether the first strip 172 at the current height is vented according to the position of the product on the support plate 184, so as to avoid wasting atomized liquid nitrogen. It includes a through port 20 set on the safety part, the through port 20 is located at the top and bottom of the horizontal tube 171, and a sealing part 21 is provided inside the through port 20. The support part 18 is provided with a storage part 22 and a limiting part 23, and the limiting part 23 is provided with an adjustment part 24.

[0039] Furthermore, the sealing part 21 includes a T-shaped plate 211 disposed inside the through opening 20, and a second strip opening 212 is provided on the T-shaped plate 211.

[0040] It should be noted that when the T-shaped plate 211 is located inside the through-hole 20, the T-shaped plate 211 prevents gas from entering the interior of the first chamber through the first strip-shaped port 172. When the T-shaped plate 211 rises to a certain height, the first strip-shaped port 172 and the second strip-shaped port 212 are interconnected, and the gas inside the horizontal tube 171 enters the interior of the first chamber in sequence through the second strip-shaped port 212 and the first strip-shaped port 172.

[0041] Furthermore, the storage section 22 includes a storage plate 221 disposed on the support plate 184, and the storage plate 221 is provided with a first cut surface 222 and a second cut surface 223.

[0042] When in use, the staff places the product on the shelf 221, selects a support plate 184 of appropriate height, holds the shelf 221 and places it on the support plate 184, and finally puts it into the cabinet 10 through the frame 183.

[0043] Furthermore, the limiting part 23 includes a limiting rod 231 disposed on the support plate 184. There are multiple limiting rods 231, which are evenly distributed on the top of the support plate 184. A limiting ring 232 and a fixing plate 233 are disposed on the limiting rod 231. The fixing plate 233 is located on the top of the limiting rod 231 and is installed on the inner wall of the frame 183. The limiting ring 232 is located on the side wall of the limiting rod 231.

[0044] Furthermore, the adjustment unit 24 includes a lifting plate 241 disposed on the side wall of the limiting rod 231. The lifting plate 241 is located above the limiting ring 232, and a groove 242 is provided on the lifting plate 241.

[0045] When in use, as the shelf 221 moves on the support plate 184, the second cut surface 223 on the shelf 221 can press against the surface of the groove 242, causing the lifting plate 241 to rise on the side wall of the limiting rod 231. When one end of the shelf 221 contacts the baffle 185, the groove 242 fits against the first cut surface 222. At this time, the placement of the shelf 221 is completed, and the first slot 172 and the second slot 212 are interconnected.

[0046] Furthermore, the auxiliary mechanism can select to open the first strip opening 172 of the corresponding height according to the height of the product to ensure the utilization rate of atomized liquid nitrogen and perform quick-freezing treatment on the product. It includes a first fixing sleeve 30 and a second fixing sleeve 31 set inside the cabinet 10. The first fixing sleeve 30 is located on the partition plate 14, and the second fixing sleeve 31 is located on the bottom surface inside the cabinet 10. The first fixing sleeve 30 is provided with a pushing part 32, and the second fixing sleeve 31 is provided with a lifting part 33. The lifting part 33 is provided with a guide part 34.

[0047] Furthermore, the pushing part 32 includes a long rod 321 disposed on the first fixed sleeve 30. The long rod 321 is arranged laterally and can move inside the first fixed sleeve 30. A trapezoidal block 322 is disposed on the long rod 321 and is located at the top of the long rod 321. A trapezoidal groove 323 is disposed on the T-shaped plate 211 and the size of the trapezoidal groove 323 is adapted to the size of the trapezoidal block 322.

[0048] It should be noted that the top of the lifting plate 241 contacts the bottom of the T-shaped plate 211, the top of the long rod 321 contacts the bottom of the T-shaped plate 211, and the side wall of the long rod 321 contacts the bottom of the lifting plate 241.

[0049] In use, when the lifting plate 241 rises, it can drive the T-shaped plate 211 to rise. When the groove 242 contacts the first cut surface 222, the first strip opening 172 and the second strip opening 212 are interconnected. When the worker pushes the long rod 321, the long rod 321 moves into the first fixed sleeve 30. At the same time, the long rod 321 drives the trapezoidal block 322 to move. The trapezoidal block 322 squeezes the trapezoidal groove 323. When the trapezoidal block 322 completely separates from the inside of the trapezoidal groove 323, one end of the long rod 321 contacts the partition plate 14, and the first strip opening 172 and the second strip opening 212 are interconnected.

[0050] Furthermore, the lifting unit 33 includes a U-shaped frame 331 mounted on the second fixed sleeve 31. The U-shaped frame 331 is placed upside down. There are two second fixed sleeves 31, which are located on both sides of the frame 183. The two ends of the U-shaped frame 331 are inserted into the interior of the two second fixed sleeves 31. A telescopic tube 332 is provided on the top of the U-shaped frame 331. The end of the telescopic tube 332 away from the U-shaped frame 331 is connected to the top surface inside the cabinet 10. There are multiple telescopic tubes 332, which are evenly distributed on the top of the U-shaped frame 331.

[0051] It should be noted that in the initial state, the telescopic tube 332 is in the extended state, and the frame 183 can enter the interior of the cabinet 10 through the U-shaped frame 331.

[0052] When in use, when the staff lifts the U-shaped frame 331 upward, the U-shaped frame 331 can move on the second fixed sleeve 31, and the U-shaped frame 331 drives the telescopic tube 332 to retract.

[0053] Furthermore, the guide part 34 includes a guide rod 341 disposed on the U-shaped frame 331. The guide rod 341 is located on the side adjacent to the long rod 321. A fixing block 342 is installed on the long rod 321. A guide groove 343 is provided on the fixing block 342. The guide rod 341 is located inside the guide groove 343.

[0054] It should be noted that the guide groove 343 contains an inclined surface. When the trapezoidal block 322 is located inside the trapezoidal groove 323, the guide rod 341 rises without contacting the inclined surface on the guide groove 343. When the guide rod 341 moves upward and contacts the inclined surface on the guide groove 343, the guide rod 341 can squeeze the inclined surface, causing the guide rod 341 to drive the fixed block 342 to move. The fixed block 342 drives the long rod 321 to move, and the long rod 321 drives the trapezoidal block 322 to move.

[0055] Working principle: When the product needs to be quick-frozen, the worker drives the rotating wheel 133, causing the threaded rod 132 to disengage from the first base 131 and the second base 134. At this time, the worker pulls the protective door 12, and then the worker places the frame 183 into the cabinet 10, so that the rollers 182 on the frame 183 are located on the slide rail 181. Pushing the frame 183 causes the rollers 182 to move on the slide rail 181. The two sides of the frame 183 contact the side walls of the long rod 321, and the bottom of the T-shaped plate 211 contacts the top of the lifting plate 241. The worker places the product on the shelf 221, places the shelf 221 on the support plate 184, and pushes the shelf 221 to move on the support plate 184, so that the shelf 221 presses against the groove 242, causing the lifting plate 241 to be against the side wall of the limit rod 231. The device rises, and the lifting plate 241 drives the T-shaped plate 211 to rise. The T-shaped plate 211 drives the second strip opening 212 to rise, so that the first strip opening 172 and the second strip opening 212 are connected to each other. At this time, the support plate 184 contacts the baffle 185, the groove 242 contacts the first cut surface 222, and the bottom of the lifting plate 241 contacts the second cut surface 223. The protective door 12 is closed, and the drive wheel 133 completes the sealing of the cabinet 10. The valve on the tank 11 is opened, and the atomized liquid nitrogen inside the tank 11 enters the interior of the cabinet 10. The fan 15 is started, and the fan 15 drives the atomized liquid nitrogen to enter the interior of the horizontal pipe 171 through the second chamber and the air inlet in sequence. Finally, the gas enters the interior of the first chamber through the second strip opening 212 and the first strip opening 172 to quickly freeze the products on the shelf 221.

[0056] When a large product is placed on the shelf 221, in order to ensure the efficiency of quick freezing, the staff can first manually push the long rod 321. The long rod 321 moves the fixing block 342 and the trapezoidal block 322 together. The trapezoidal block 322 squeezes the trapezoidal groove 323, causing the T-shaped plate 211 to rise. The T-shaped plate 211 drives the second strip opening 212 to rise. When the trapezoidal block 322 completely detaches from the inside of the trapezoidal groove 323, the second strip opening 212 and the first strip opening 172 are interconnected, so that multiple first strip openings 172 simultaneously exhaust air to quickly freeze the product.

[0057] After the product is quick-frozen, in order to accurately quick-freeze products in different positions, the T-shaped plate 211 needs to be reset. The worker pulls the shelf 221, causing it to gradually detach from the support plate 184. During this process, the first cut surface 222 separates from the groove 242. When the second cut surface 223 detaches from the bottom of the lifting plate 241, under the influence of gravity, the lifting plate 241 and the T-shaped plate 211 descend together. When the lifting plate 241 contacts the limiting ring 232, it stops descending, and the T-shaped plate 211 re-seals the first slot 172. The worker then pushes the U-shaped frame 331 upwards. The frame 331 drives the telescopic tube 332 to retract, and the U-shaped frame 331 drives the guide rod 341 to press the inclined surface on the guide groove 343, so that the fixed block 342 drives the long rod 321 to move. The long rod 321 drives the trapezoidal block 322 to move. When the trapezoidal block 322 is below the trapezoidal groove 323, under the action of gravity, the T-shaped plate 211 drives the trapezoidal groove 323 to descend, so that the trapezoidal block 322 is located inside the trapezoidal groove 323. At this time, the T-shaped plate 211 completes the sealing of the first slot 172. Thus, the sealing of all the first slots 172 is completed, reducing the loss of atomized liquid nitrogen. Repeating this process can complete the quick-freezing treatment of products of different sizes.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A liquid nitrogen-based food preservation system, characterized in that: include, The preservation mechanism includes a cabinet (10) and a tank (11). The cabinet (10) is connected to a protective door (12) via a pivot. A locking part (13) for sealing the cabinet (10) is provided on the side wall of the cabinet (10). A partition plate (14) is provided inside the cabinet (10). A fan (15) and an air outlet (16) are provided on the partition plate (14). A preservation part (17) for guiding the flow of atomized liquid nitrogen is provided on the partition plate (14). A support part (18) is provided inside the cabinet (10). The adjustment mechanism includes a through-hole (20) provided on the safety part, a sealing part (21) provided inside the through-hole (20), a storage part (22) and a limiting part (23) provided on the support part (18), and an adjustment part (24) provided on the limiting part (23). The auxiliary mechanism includes a first fixed sleeve (30) and a second fixed sleeve (31) disposed inside the cabinet (10). The first fixed sleeve (30) is provided with a pushing part (32), and the second fixed sleeve (31) is provided with a lifting part (33). The lifting part (33) is provided with a guide part (34).

2. The liquid nitrogen-based food preservation system according to claim 1, characterized in that: The locking part (13) includes a first base (131) disposed on the side wall of the cabinet (10), a threaded rod (132) disposed on the first base (131), a rotating wheel (133) disposed on the threaded rod (132), and a second base (134) disposed on the protective door (12).

3. The liquid nitrogen-based food preservation system according to claim 2, characterized in that: The preservation section (17) includes a horizontal tube (171) disposed on the partition plate (14), and a first strip opening (172) is provided on the side wall of the horizontal tube (171).

4. The liquid nitrogen-based food preservation system according to claim 3, characterized in that: The support part (18) includes a slide rail (181) disposed inside the cabinet (10), a roller (182) disposed on the slide rail (181), a frame (183) disposed on the roller (182), and a support plate (184) and a baffle (185) disposed on the frame (183).

5. A liquid nitrogen-based food preservation system according to claim 4, characterized in that: The sealing part (21) includes a T-shaped plate (211) disposed inside the through opening (20), and a second strip opening (212) is provided on the T-shaped plate (211).

6. The liquid nitrogen-based food preservation system according to claim 5, characterized in that: The storage section (22) includes a storage plate (221) disposed on the support plate (184), and the storage plate (221) is provided with a first cut surface (222) and a second cut surface (223).

7. A liquid nitrogen-based food preservation system according to claim 6, characterized in that: The limiting part (23) includes a limiting rod (231) disposed on the support plate (184), and a limiting ring (232) and a fixing plate (233) are disposed on the limiting rod (231). The adjustment part (24) includes a lifting plate (241) disposed on the side wall of the limiting rod (231), and the lifting plate (241) is provided with a groove (242).

8. A liquid nitrogen-based food preservation system according to claim 7, characterized in that: The pushing part (32) includes a long rod (321) disposed on the first fixed sleeve (30), a trapezoidal block (322) disposed on the long rod (321), and a trapezoidal groove (323) disposed on the T-shaped plate (211).

9. A liquid nitrogen-based food preservation system according to claim 8, characterized in that: The lifting part (33) includes a U-shaped frame (331) disposed on the second fixed sleeve (31), and a telescopic tube (332) is disposed on the top of the U-shaped frame (331).

10. A liquid nitrogen-based food preservation system according to claim 9, characterized in that: The guide part (34) includes a guide rod (341) disposed on the U-shaped frame (331), a fixing block (342) is installed on the long rod (321), and a guide groove (343) is provided on the fixing block (342).

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