Adjustable multi-shelf ultra-low temperature freezer and method of use thereof

Abstract

The application relates to the technical field of multi-layer shelf ultra-low temperature freezers, and discloses a multi-layer shelf ultra-low temperature freezer which comprises a freezer body, a hinge fixedly connected to one side of the freezer body, a cabinet door fixedly connected to one side of the hinge, the cabinet door abutting against the freezer body, motors fixedly connected to the upper sides of the inside of the freezer body, first rotating shafts movably connected to the outer sides of the two motors, conveyer belts movably sleeved with the circumferential outer surfaces of the two first rotating shafts, and second rotating shafts movably sleeved with the inner sides of the two conveyer belts. The adjustable multi-layer shelf ultra-low temperature freezer and the using method thereof facilitate the storage and taking of the articles located at the high or low positions of the shelves, facilitate the use of the freezer, facilitate the dismounting of the shelf platforms, and facilitate the redistribution of the storage space above the shelves according to the quantity of the stored articles.

Description

Technical Field

[0001] This invention relates to the field of multi-shelf ultra-low temperature freezer technology, and particularly to an adjustable multi-shelf ultra-low temperature freezer and its usage method. Background Technology

[0002] Medical freezers are a category of medical refrigerators used in the medical industry. They are specialized equipment for refrigerating medicines and are mainly used for the refrigeration, preservation, and transportation of pharmaceuticals, biological agents, vaccines, and blood. They can also be used to store biological products. They are suitable for pharmacies, pharmaceutical factories, hospitals, disease control centers, and clinics.

[0003] Existing multi-shelf ultra-low temperature freezers have certain drawbacks in use. First, it is inconvenient to access items located at high or low positions on the shelves, making the freezer less convenient to use. Second, the shelves of existing multi-shelf ultra-low temperature freezers are prone to getting dirty and damaged after prolonged use, requiring disassembly, which is inconvenient. Finally, it is not convenient to reallocate the storage space above the shelves according to the number of items stored. Therefore, an adjustable multi-shelf ultra-low temperature freezer and its usage method are proposed. Summary of the Invention

[0004] The main objective of this invention is to provide an adjustable multi-shelf ultra-low temperature freezer and its usage method, which solves the problems of existing multi-shelf ultra-low temperature freezers, such as inconvenience in storing and retrieving items located at high or low positions on the shelves, inconvenience in using the freezer, the shelves of existing multi-shelf ultra-low temperature freezers being prone to dirt and damage after long-term use and needing to be disassembled, the inconvenience of disassembling existing shelves, and the inconvenience of reallocating the storage space above the shelves according to the number of items stored.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A multi-layer shelf ultra-low temperature freezer includes a freezer body. A hinge is fixedly connected to one side of the freezer body, and a door is fixedly connected to one side of the hinge. One side of the door abuts against the freezer body. Motors are fixedly connected to both sides of the upper interior of the freezer body. First rotating shafts are movably connected to the outer sides of the two motors. Conveyor belts are movably sleeved on the outer circumference of the two first rotating shafts. Second rotating shafts are movably sleeved on the inner sides of the two conveyor belts. Movable rods are fixedly connected to the inner sides of the two second rotating shafts. Movable cylinders are movably sleeved on the outer sides of the two movable rods. The inner sides of the two movable cylinders are fixedly connected to the inner wall of the freezer body. Three sets of shelf assemblies are fixedly connected at equal intervals between the two conveyor belts.

[0007] Furthermore, the shelf assembly includes two mounting blocks, which are respectively fixedly connected to the inner sides of two conveyor belts. Several collars are fixedly connected to the inner sides of each mounting block, with adjacent collars forming a group. A first transmission rod is movably sleeved in the middle of each group of collars. A first rotating plate is fixedly connected to one end of each of the two first transmission rods. A first mounting hole is opened on one side of each of the two first rotating plates. A second mounting hole is opened on one side of each of the two mounting blocks. A fixing bolt passes through the two first mounting holes, and the two fixing bolts pass through adjacent second mounting holes.

[0008] Furthermore, several hooks are fixedly connected at equal intervals to the inner sides of the outer circumference of the two first transmission rods, and several adjacent hooks form a group, with a second transmission rod movably sleeved on the inner side of each group of hooks.

[0009] Furthermore, a first shelf platform is fixedly connected to one side of one of the second transmission rods, and a first mounting bracket is fixedly connected to the lower part of the first shelf platform. Two first mounting slots are equidistantly formed below the first mounting bracket, and a connecting rod passes through each of the two first mounting slots. A push plate is fixedly connected to the outer side of each of the two connecting rods, and a first spring is fixedly connected between the two push plates. A clamping block is fixedly connected to the inner side of each of the two connecting rods, and the two clamping blocks abut against the inner wall of the first mounting bracket.

[0010] Furthermore, a fixing block abuts between the two clamping blocks, a push rod is fixedly connected below the fixing block, a second mounting bracket abuts below the fixing block, a second mounting groove is provided below the second mounting bracket, the push rod passes through the second mounting groove, a second shelf platform is fixedly connected above the second mounting bracket, and the upper part of the fixing block abuts against the second shelf platform.

[0011] Furthermore, the inner sides of the first shelf platform and the second shelf platform are each provided with three equidistant limiting grooves, with two opposing limiting grooves forming a group. Each of the three groups of limiting grooves contains a movable limiting block, and a partition is fixedly connected above the three limiting blocks.

[0012] Furthermore, a passage groove is provided on one side of the partition, and a third shelf platform is movable within the passage groove. A toothed plate is fixedly connected to one side of the third shelf platform, and a gear is toothed on the upper part of the toothed plate. The gear moves within a movable groove, and a fixing rod is fixedly connected to one side of the gear. A fixing hole is provided on one side of the inner side of the partition, and the fixing rod passes through the fixing hole. A second rotating plate is fixedly connected to the outer side of the fixing rod.

[0013] Furthermore, a connecting plate is fixedly connected to the outer side of the partition, and a movable hole is provided in the middle of the connecting plate. A limit rod moves within the movable hole, a pull plate is fixedly connected above the limit rod, a second spring is fixedly connected below the pull plate, and the connecting plate is fixedly connected below the second spring.

[0014] Furthermore, the outer sides of both the first shelf platform and the second shelf platform are fixedly connected to limit plates, and the inner sides of both limit plates are provided with fixing grooves. The limit rod moves between the two fixing grooves, and a number of limit holes are provided at equal intervals on one side of both limit plates.

[0015] This invention also provides a method for using a multi-shelf ultra-low temperature freezer, the specific steps of which are as follows:

[0016] S1. When in use, place the freezer body on a horizontal plane, open the door, and place items that need to be refrigerated on the first shelf platform, the second shelf platform, and the third shelf platform. When you need to access items located at the high or low position of the shelf, start the motor. The motor drives the first rotating shaft to rotate, and the first rotating shaft drives the conveyor belt to move. Because the second rotating shaft is connected to the bottom of the conveyor belt, the conveyor belt can move around the second rotating shaft. The conveyor belt drives the shelf assembly to move up and down through the mounting block. The shelf assembly drives the items on the shelf assembly to move up and down, and at this time, the items can be accessed.

[0017] S2. When it is necessary to disassemble and clean the shelf platform, remove the fixing bolts, rotate the first rotating plate, and the first rotating plate drives the hook to rotate around the first driving rod as the axis until the hook is no longer sleeved on the outside of the second driving rod. At this time, the first shelf platform, the second shelf platform and the third shelf platform can be removed for cleaning and maintenance.

[0018] S3. When it is necessary to redistribute the storage space above the shelf according to the number of stored items, pull the pull plate. The pull plate drives the second spring to stretch, and the pull plate drives the limit rod to stop moving in the fixed groove. Push the partition to move as needed. Because the limit block fixedly connected to the partition moves in the limit groove, the partition can move along the direction of the limit groove until the partition moves to the required position and the limit rod is aligned with the limit hole. Release the pull plate, and the second spring drives the limit rod to insert into the limit hole and fix it through the pull plate, so as to realize the redistribution of the storage space above the first shelf platform and the second shelf platform.

[0019] S4. Rotate the second rotating plate. The second rotating plate drives the toothed plate to move through the fixed rod and gear. The toothed plate drives the third shelf platform to move, thereby redistributing the storage space above the third shelf platform.

[0020] S5. Push the push plate outward. The push plate can drive the clamping block to move outward through the linkage rod until the clamping plates no longer abut against the fixed block. Pull the push rod until the push rod drives the fixed block to no longer move between the two clamping blocks. At this time, the first shelf platform and the second shelf platform can be rotated with the second transmission rod as the axis until the first shelf platform and the second shelf platform are perpendicular to the ground. At this time, the partition can be pushed along the direction of the limiting groove until the limiting block fixedly connected to the partition no longer moves in the limiting groove. At this time, the partition can be removed to increase the space inside the freezer in the vertical direction, making it convenient to place large items.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention facilitates the storage and retrieval of items located at high or low positions on the shelves by using a conveyor belt. When the motor is started, it drives the first rotating shaft to rotate, which in turn drives the conveyor belt. Because a second rotating shaft is attached below the conveyor belt, the conveyor belt can move around the second rotating shaft. The conveyor belt, through the mounting block, drives the shelf assembly to move vertically, and the shelf assembly, in turn, moves the items on the shelf assembly vertically. This design facilitates the storage and retrieval of items located at high or low positions on the shelves, thus simplifying the use of the freezer.

[0023] 2. The present invention facilitates the disassembly of the shelf platform by setting the second transmission rod. After removing the fixing bolts, the first rotating plate is rotated. The first rotating plate drives the hook to rotate around the first transmission rod as the axis until the hook is no longer sleeved on the outside of the second transmission rod. At this time, the first shelf platform and the second shelf platform can be removed for cleaning and maintenance. This setting facilitates the disassembly of the shelf platform.

[0024] 3. This invention, through the setting of a limiting rod, facilitates the redistribution of storage space above the shelves according to the number of items stored. Pulling the pull plate causes the second spring to stretch, and the pull plate causes the limiting rod to stop moving within the fixed groove. As needed, the partition is pushed to move. Because the limiting block fixedly connected to the partition moves within the limiting groove, the partition can move along the direction of the limiting groove until the partition moves to the desired position, and the limiting rod aligns with the limiting hole. Releasing the pull plate causes the second spring to drive the limiting rod to insert into the limiting hole and fix it, thereby redistributing the storage space above the first and second shelf platforms. Rotating the second rotating plate causes the toothed plate to move through the fixed rod and gear, and the toothed plate drives the third shelf platform to move, thereby redistributing the storage space above the third shelf platform. This design facilitates the redistribution of storage space above the shelves according to the number of items stored.

[0025] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0027] Figure 2 This is an enlarged schematic diagram of a portion of the conveyor belt structure of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0028] Figure 3 This is an enlarged schematic diagram of a portion of the motor structure of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0029] Figure 4 This is an enlarged schematic diagram of a portion of the structure of the mounting block of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0030] Figure 5 This is an enlarged schematic diagram of a portion of the structure of the first shelf platform of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0031] Figure 6 This is an enlarged schematic diagram of a portion of the structure of the second shelf platform of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0032] Figure 7 This is an enlarged schematic diagram of a portion of the limiting groove structure of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0033] Figure 8 This is an enlarged schematic diagram of a portion of the partition structure of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0034] Figure 9 This is an enlarged schematic diagram of a portion of the gear structure of a multi-layer shelf ultra-low temperature freezer according to the present invention.

[0035] In the diagram: 1. Freezer body; 2. Hinge; 3. Door; 4. Motor; 5. First rotating shaft; 6. Second rotating shaft; 7. Conveyor belt; 8. Mounting block; 9. First transmission rod; 10. Collar; 11. Fixing bolt; 12. First rotating plate; 13. Hook; 14. First shelf platform; 15. Second shelf platform; 16. Second transmission rod; 17. First spring; 18. Push plate; 19. Clamping block; 20. Fixing block; 21. Push rod; 22. Limiting plate; 23. Limiting groove; 24. Limiting block; 25. Second spring; 26. Limiting rod; 27. Third shelf platform; 28. Partition; 29. ​​Gear; 30. Second rotating plate; 31. Gear plate. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] like Figures 1-3As shown, a multi-layer shelf ultra-low temperature freezer includes a freezer body 1. A hinge 2 is fixedly connected to one side of the freezer body 1, and a door 3 is fixedly connected to one side of the hinge 2. One side of the door 3 abuts against the freezer body 1. Motors 4 are fixedly connected to both sides of the upper interior of the freezer body 1. First rotating shafts 5 are movably connected to the outer sides of the two motors 4. Conveyor belts 7 are movably sleeved on the outer circumference of the two first rotating shafts 5. Second rotating shafts 6 are movably sleeved on the inner sides of the two conveyor belts 7. Movable rods are fixedly connected to the inner sides of the two second rotating shafts 6. Movable cylinders are movably sleeved on the outer sides of the two movable rods. The sides are fixedly connected to the inner wall of the freezer body 1. Three sets of shelf assemblies are fixedly connected at equal intervals between the two conveyor belts 7. By adopting the above technical solution, the motor 4 is started, the motor 4 drives the first rotating shaft 5 to rotate, the first rotating shaft 5 drives the conveyor belt 7 to move. Because the second rotating shaft 6 is sleeved below the conveyor belt 7, the conveyor belt 7 can move around the second rotating shaft 6. The conveyor belt 7 drives the shelf assembly to move up and down through the mounting block 8. The shelf assembly drives the items on the shelf assembly to move up and down. With this setting, it is convenient to store and retrieve items located at high or low positions on the shelf, and it is convenient to use the freezer.

[0038] like Figures 1-6 As shown, the shelf assembly includes two mounting blocks 8, which are fixedly connected to the inner sides of two conveyor belts 7 respectively. Several collars 10 are fixedly connected to the inner sides of each mounting block 8. Adjacent collars 10 form a group, and a first transmission rod 9 is movably sleeved in the middle of each group of collars 10. A first rotating plate 12 is fixedly connected to one end of each of the two first transmission rods 9. A first mounting hole is opened on one side of each of the two first rotating plates 12, and a second mounting hole is opened on one side of each of the two mounting blocks 8. Fixing bolts 11 pass through the two first mounting holes, and the two fixing bolts 11 pass through adjacent second mounting holes. By adopting the above technical solution, the conveyor belt 7 can drive the shelf assembly to move up and down through the mounting blocks 8.

[0039] like Figures 1-6 As shown, several hooks 13 are fixedly connected at equal intervals on the inner side of the outer circumference of the two first transmission rods 9. Several adjacent hooks 13 form a group, and a second transmission rod 16 is movably sleeved on the inner side of each group of hooks 13. With this arrangement, the second transmission rod 16 can rotate within the second transmission rod 16.

[0040] like Figures 1-6As shown, a first shelf platform 14 is fixedly connected to one side of a second transmission rod 16. A first mounting bracket is fixedly connected to the lower part of the first shelf platform 14. Two first mounting slots are equidistantly opened on the lower part of the first mounting bracket. A connecting rod passes through both first mounting slots. Push plates 18 are fixedly connected to the outer sides of both connecting rods. A first spring 17 is fixedly connected between the two push plates 18. Clamping blocks 19 are fixedly connected to the inner sides of both connecting rods. Both clamping blocks 19 abut against the inner wall of the first mounting bracket. With this arrangement, the push plates 18 are pushed, and the push plates 18 can drive the clamping blocks 19 to move through the connecting rods.

[0041] like Figures 1-6 As shown, a fixing block 20 abuts between two clamping blocks 19. A push rod 21 is fixedly connected to the lower part of the fixing block 20. A second mounting bracket abuts below the fixing block 20. A second mounting groove is opened at the lower part of the second mounting bracket. The push rod 21 passes through the second mounting groove. A second shelf platform 15 is fixedly connected to the upper part of the second mounting bracket, and the upper part of the fixing block 20 abuts against the second shelf platform 15. With this arrangement, pushing the push plate 18 outward can cause the clamping blocks 19 to move outward through the linkage rod until the clamping blocks are no longer abutting. Pull the push rod 21 with the fixed block 20 until the push rod 21 causes the fixed block 20 to stop moving between the two clamping blocks 19. At this time, the first shelf platform 14 and the second shelf platform 15 can be rotated with the second transmission rod 16 as the axis until the first shelf platform 14 and the second shelf platform 15 are perpendicular to the ground. At this time, the partition 28 can be pushed along the direction of the limiting groove 23 until the limiting block 24 fixedly connected to the partition 28 stops moving in the limiting groove 23. At this time, the partition 28 can be removed to increase the space inside the freezer in the vertical direction, making it convenient to place large items.

[0042] like Figures 1-9 As shown, three limiting grooves 23 are equally spaced on the inner sides of the first shelf platform 14 and the second shelf platform 15. Two opposite limiting grooves 23 form a group. Each of the three groups of limiting grooves 23 has a movable limiting block 24. A partition 28 is fixedly connected above the three limiting blocks 24. With this arrangement, the partition 28 can drive the limiting blocks 24 to move.

[0043] like Figures 1-9 As shown, a passage groove is provided on one side of the partition 28, and a third shelf platform 27 is movable in the passage groove. A toothed plate 31 is fixedly connected to one side of the third shelf platform 27. A gear 29 is toothed on the top of the toothed plate 31, and the gear 29 is movable in the movable groove. A fixing rod is fixedly connected to one side of the gear 29. A fixing hole is provided on one side of the interior of the partition 28, and the fixing rod passes through the fixing hole. A second rotating plate 30 is fixedly connected to the outside of the fixing rod. With this arrangement, the gear 29 can drive the toothed plate 31 to move.

[0044] like Figures 1-9As shown, a connecting plate is fixedly connected to the outer side of the partition 28. A movable hole is opened in the middle of the connecting plate. A limit rod 26 moves in the movable hole. A pull plate is fixedly connected above the limit rod 26. A second spring 25 is fixedly connected below the pull plate. The connecting plate is fixedly connected below the second spring 25. With this arrangement, the limit rod 26 can be driven to move by the pull plate.

[0045] like Figures 1-9 As shown, limit plates 22 are fixedly connected to the outer sides of both the first shelf platform 14 and the second shelf platform 15. Fixed grooves are formed on the inner sides of both limit plates 22, and a limit rod 26 moves between the two fixed grooves. Several limit holes are equidistantly formed on one side of each of the two limit plates 22. By adopting the above technical solution, pulling the pull plate causes the second spring 25 to stretch, and the pull plate causes the limit rod 26 to stop moving within the fixed groove. As needed, the partition 28 is pushed to move. Because the limit block 24 fixedly connected to the partition 28 moves within the limit groove 23, the partition 28 can move along the direction of the limit groove 23 until... When the partition 28 moves to the desired position, the limiting rod 26 aligns with the limiting hole. The pull plate is released, and the second spring 25 drives the limiting rod 26 to insert into the limiting hole and fix it through the pull plate, thereby redistributing the storage space above the first shelf platform 14 and the second shelf platform 15. The second rotating plate 30 is rotated, and the second rotating plate 30 drives the toothed plate 31 to move through the fixing rod and the gear 29. The toothed plate 31 drives the third shelf platform 27 to move, thereby redistributing the storage space above the third shelf platform 27. This setting facilitates the redistribution of the storage space above the shelves according to the number of items stored.

[0046] It should be noted that when in use, the freezer body 1 is placed on a horizontal plane, the door 3 is opened, and items that need to be refrigerated can be placed on the first shelf platform 14, the second shelf platform 15 and the third shelf platform 27. When it is necessary to access items located at the high or low position of the shelf, the motor 4 is started. The motor 4 drives the first rotating shaft 5 to rotate, and the first rotating shaft 5 drives the conveyor belt 7 to move. Because the second rotating shaft 6 is connected to the bottom of the conveyor belt 7, the conveyor belt 7 can move around the second rotating shaft 6. The conveyor belt 7 drives the shelf assembly to move up and down through the mounting block 8. The shelf assembly drives the items on the shelf assembly to move up and down, and at this time, the items can be accessed.

[0047] When the shelf platform needs to be disassembled and cleaned, remove the fixing bolt 11, rotate the first rotating plate 12, and the first rotating plate 12 drives the hook 13 to rotate around the first transmission rod 9 as the axis through the first transmission rod 9 until the hook 13 is no longer sleeved on the outside of the second transmission rod 16. At this time, the first shelf platform 14, the second shelf platform 15 and the third shelf platform 27 can be removed for cleaning and maintenance.

[0048] When it is necessary to redistribute the storage space above the shelves according to the number of stored items, pull the pull plate. The pull plate causes the second spring 25 to stretch, and the pull plate causes the limit rod 26 to stop moving in the fixed groove. As needed, push the partition 28 to move. Because the limit block 24 fixedly connected to the partition 28 moves in the limit groove 23, the partition 28 can move along the direction of the limit groove 23 until the partition 28 moves to the required position and the limit rod 26 is aligned with the limit hole. Release the pull plate, and the second spring 25 drives the limit rod 26 to insert into the limit hole and fix it through the pull plate, so as to redistribute the storage space above the first shelf platform 14 and the second shelf platform 15. Rotate the second rotating plate 30. The second rotating plate 30 drives the toothed plate 31 to move through the fixed rod and gear 29. The toothed plate 31 drives the third shelf platform 27 to move, so as to redistribute the storage space above the third shelf platform 27.

[0049] Push the push plate 18 outward, and the push plate 18 will drive the clamping block 19 to move outward through the linkage rod until the clamping plates no longer abut against the fixing block 20. Pull the push rod 21 until the push rod 21 drives the fixing block 20 to stop moving between the two clamping blocks 19. At this time, the first shelf platform 14 and the second shelf platform 15 can be rotated with the second transmission rod 16 as the axis until the first shelf platform 14 and the second shelf platform 15 are perpendicular to the ground. At this time, the partition 28 can be pushed along the direction of the limiting groove 23 until the limiting block 24 fixedly connected to the partition 28 no longer moves in the limiting groove 23. At this time, the partition 28 can be removed to increase the space inside the freezer in the vertical direction, making it convenient to place large items.

[0050] This invention provides an adjustable multi-shelf ultra-low temperature freezer and its usage method, which solves the problems of existing multi-shelf ultra-low temperature freezers, such as inconvenience in storing and retrieving items located at high or low positions on the shelves, inconvenience in using the freezer, the shelves of existing multi-shelf ultra-low temperature freezers being prone to dirt and damage after long-term use and needing to be disassembled, the inconvenience of disassembling the existing shelves, and the inconvenience of reallocating the storage space above the shelves according to the number of items stored. This invention is more practical.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-layer shelf ultra-low temperature freezer, characterized in that: The refrigerator includes a freezer body (1), a hinge (2) is fixedly connected to one side of the freezer body (1), a door (3) is fixedly connected to one side of the hinge (2), one side of the door (3) abuts against the freezer body (1), motors (4) are fixedly connected to both sides of the upper interior of the freezer body (1), a first rotating shaft (5) is movably connected to the outer side of the two motors (4), a conveyor belt (7) is movably sleeved on the outer circumference of the two first rotating shafts (5), a second rotating shaft (6) is movably sleeved on the inner side of the two conveyor belts (7), a movable rod is fixedly connected to the inner side of the two second rotating shafts (6), a movable cylinder is movably sleeved on the outer side of the two movable rods, and the inner side of the two movable cylinders is fixedly connected to the inner wall of the freezer body (1), and three sets of shelf assemblies are fixedly connected at equal intervals in the middle of the two conveyor belts (7). The shelf assembly includes two mounting blocks (8), which are fixedly connected to the inner sides of two conveyor belts (7). Several collars (10) are fixedly connected to the inner sides of the two mounting blocks (8). The several collars (10) adjacent to each other form a group. A first transmission rod (9) is movably sleeved in the middle of each group of collars (10). A first rotating plate (12) is fixedly connected to one end of each of the two first transmission rods (9). A first mounting hole is opened on one side of each of the two first rotating plates (12). A second mounting hole is opened on one side of each of the two mounting blocks (8). A fixing bolt (11) passes through each of the two first mounting holes. The two fixing bolts (11) pass through the adjacent second mounting holes.

2. The multi-layer shelf ultra-low temperature freezer according to claim 1, characterized in that: Several hooks (13) are fixedly connected at equal intervals on the inner side of the outer circumference of the two first transmission rods (9). Several adjacent hooks (13) form a group, and a second transmission rod (16) is movably sleeved on the inner side of each group of hooks (13).

3. A multi-layer shelf ultra-low temperature freezer according to claim 2, characterized in that: A first shelf platform (14) is fixedly connected to one side of a second transmission rod (16). A first mounting bracket is fixedly connected to the lower part of the first shelf platform (14). Two first mounting slots are equidistantly opened below the first mounting bracket. A connecting rod passes through both first mounting slots. A push plate (18) is fixedly connected to the outer side of both connecting rods. A first spring (17) is fixedly connected between the two push plates (18). A clamping block (19) is fixedly connected to the inner side of both connecting rods, and both clamping blocks (19) abut against the inner wall of the first mounting bracket.

4. A multi-layer shelf ultra-low temperature freezer according to claim 3, characterized in that: A fixing block (20) abuts between the two clamping blocks (19). A push rod (21) is fixedly connected below the fixing block (20). A second mounting bracket abuts below the fixing block (20). A second mounting groove is provided below the second mounting bracket. The push rod (21) passes through the second mounting groove. A second shelf platform (15) is fixedly connected above the second mounting bracket. The second shelf platform (15) abuts above the fixing block (20).

5. A multi-layer shelf ultra-low temperature freezer according to claim 4, characterized in that: The first shelf platform (14) and the second shelf platform (15) are provided with three equidistant limiting grooves (23) on their inner sides. The two opposite limiting grooves (23) form a group. Each of the three groups of limiting grooves (23) has a movable limiting block (24). A partition plate (28) is fixedly connected above the three limiting blocks (24).

6. A multi-layer shelf ultra-low temperature freezer according to claim 5, characterized in that: The partition (28) has a passage groove, in which a third shelf platform (27) moves. A toothed plate (31) is fixedly connected to one side of the third shelf platform (27). A gear (29) is toothed on the top of the toothed plate (31), and the gear (29) moves in a movable groove. A fixing rod is fixedly connected to one side of the gear (29). A fixing hole is opened on one side of the interior of the partition (28), through which the fixing rod passes. A second rotating plate (30) is fixedly connected to the outside of the fixing rod.

7. A multi-layer shelf ultra-low temperature freezer according to claim 6, characterized in that: A pull plate is fixedly connected above the limiting rod (26) on the outer side of the partition (28), and a second spring (25) is fixedly connected below the pull plate. A connecting plate is fixedly connected below the second spring (25).

8. A multi-layer shelf ultra-low temperature freezer according to claim 7, characterized in that: Limiting plates (22) are fixedly connected to the outer sides of the first shelf platform (14) and the second shelf platform (15). The inner sides of the two limiting plates (22) are provided with fixing grooves. The limiting rod (26) moves between the two fixing grooves. Several limiting holes are provided at equal intervals on one side of the two limiting plates (22).

9. A method of using a multi-layer shelf ultra-low temperature freezer as described in claim 8, characterized in that: Includes the following steps: S1. When in use, place the freezer body (1) on a horizontal plane and open the cabinet door (3). Items that need to be refrigerated can be placed on the first shelf platform (14), the second shelf platform (15) and the third shelf platform (27). When it is necessary to store or retrieve items located at the high or low position of the shelf, start the motor (4). The motor (4) drives the first rotating shaft (5) to rotate. The first rotating shaft (5) drives the conveyor belt (7) to move. Because the second rotating shaft (6) is attached to the bottom of the conveyor belt (7), the conveyor belt (7) can move around the second rotating shaft (6). The conveyor belt (7) drives the shelf assembly to move up and down through the mounting block (8). The shelf assembly drives the items on the shelf assembly to move up and down. At this time, the items can be stored or retrieved. S2. When it is necessary to disassemble and clean the shelf platform, remove the fixing bolt (11), rotate the first rotating plate (12), and the first rotating plate (12) drives the hook (13) to rotate around the first transmission rod (9) as the axis until the hook (13) is no longer sleeved on the outside of the second transmission rod (16). At this time, the first shelf platform (14), the second shelf platform (15) and the third shelf platform (27) can be removed for cleaning and maintenance. S3. When it is necessary to redistribute the storage space above the shelf according to the number of stored items, pull the pull plate. The pull plate drives the second spring (25) to stretch. The pull plate drives the limit rod (26) to stop moving in the fixed groove. Push the partition (28) to move as needed. Because the limit block (24) fixedly connected to the partition (28) moves in the limit groove (23), the partition (28) can move along the direction of the limit groove (23) until the partition (28) moves to the required position. The limit rod (26) is aligned with the limit hole. Release the pull plate. The second spring (25) drives the limit rod (26) to insert into the limit hole and fix it through the pull plate, so as to realize the redistribution of the storage space above the first shelf platform (14) and the second shelf platform (15). S4. Rotate the second rotating plate (30). The second rotating plate (30) drives the toothed plate (31) to move through the fixed rod and gear (29). The toothed plate (31) drives the third shelf platform (27) to move, thereby realizing the redistribution of the storage space above the third shelf platform (27). S5. Push the push plate (18) outward. The push plate (18) can drive the clamping block (19) to move outward through the linkage rod until the clamping plates no longer abut against the fixed block (20). Pull the push rod (21) until the push rod (21) drives the fixed block (20) to no longer move between the two clamping blocks (19). At this time, the first shelf platform (14) and the second shelf platform (15) can be rotated with the second transmission rod (16) as the axis until the first shelf platform (14) and the second shelf platform (15) are perpendicular to the ground. At this time, the partition (28) can be pushed along the direction of the limiting groove (23) until the limiting block (24) fixedly connected to the partition (28) no longer moves in the limiting groove (23). At this time, the partition (28) can be removed to increase the space inside the freezer in the vertical direction, making it convenient to place large items.

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