Aquatic processing liquid nitrogen freezing apparatus

Abstract

The application discloses a kind of aquatic processing liquid nitrogen freezing equipment, it is related to aquatic freezing field, including freezer, liquid nitrogen storage room and aquatic freezing chamber are equipped in freezer inside, multiple groups of partition cooling mechanism are installed from top to bottom in aquatic freezing chamber inside, partition cooling mechanism includes main plate and control guide plate, inner cavity is equipped in main plate inside, control guide plate is movably assembled in inner cavity, liquid nitrogen flow cavity for liquid nitrogen flow is equipped in control guide plate inside, outer guide hole is opened in the surface of main plate, inner guide hole is opened in the surface of control guide plate, control guide plate can move horizontally in inner cavity.The application is set by partition cooling mechanism in aquatic freezing chamber, aquatic freezing chamber can be divided into multiple areas by partition cooling mechanism, so that when aquatic fills entire aquatic freezing chamber, by the distribution of partition cooling mechanism, liquid nitrogen can be evenly flowed into aquatic in each area, so that the effect of uniform and rapid freezing is realized, and the quality of aquatic freezing is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of aquatic product freezing, and more particularly to a liquid nitrogen freezing device for aquatic product processing. Background Technology

[0002] As is well known, with the rapid development of the global aquaculture industry, the demand for freezing technology in the seafood processing industry is increasing. Liquid nitrogen freezing technology is widely used in the seafood processing field due to its advantages such as rapid cooling and maintaining the freshness of aquatic products. Liquid nitrogen can reach temperatures as low as -196°C, which can quickly lower the internal temperature of aquatic products, inhibit the activity of bacteria and enzymes, and thus effectively extend the shelf life of aquatic products.

[0003] However, existing liquid nitrogen freezing equipment has some technical problems that restrict the improvement of freezing effect and ease of operation. First, due to the depth design of the freezing chamber, the flow of cold air is obstructed during the stacking of aquatic products, causing some aquatic products to fail to reach the required freezing temperature quickly. This uneven freezing process not only affects the quality and taste of aquatic products, but may also cause some aquatic products to thaw after freezing, increasing the difficulty of subsequent processing;

[0004] Secondly, the unloading process after freezing also presents challenges. Because frozen seafood tends to adhere to the freezer walls and other aquatic products, additional labor and time are required for separation and handling during unloading. This not only reduces production efficiency but may also damage the seafood, affecting its market value. Summary of the Invention

[0005] (a) Purpose of the invention

[0006] In view of this, the purpose of this invention is to provide a liquid nitrogen freezing device for aquatic product processing. This device, by setting a partitioning and cooling mechanism in the aquatic product freezing chamber, can divide the aquatic product freezing chamber into multiple areas. When the aquatic product freezing chamber is full of aquatic products, the liquid nitrogen can flow evenly into the aquatic products in each area through the partitioning and cooling mechanism, thereby achieving a uniform and rapid freezing effect and ensuring the quality of the frozen aquatic products.

[0007] (II) Technical Solution

[0008] To achieve the above technical objectives, the present invention provides a liquid nitrogen freezing equipment for aquatic product processing, which includes a freezer. The freezer is provided with a liquid nitrogen storage chamber and an aquatic product freezing chamber. Multiple sets of partitioned cooling mechanisms are installed inside the aquatic product freezing chamber from top to bottom. A liquid nitrogen storage tank for supplying liquid nitrogen to the partitioned cooling mechanisms for aquatic product freezing is installed inside the liquid nitrogen storage chamber.

[0009] The cooling mechanism includes a main board and a control guide plate. The main board has an internal cavity, and the control guide plate is movably mounted within this cavity. The control guide plate has a liquid nitrogen flow chamber for supplying liquid nitrogen. An external guide hole is formed on the surface of the main board, and an internal guide hole is formed on the surface of the control guide plate. The control guide plate can move horizontally within the internal cavity. The movement of the control guide plate allows the external and internal guide holes to be either completely overlapped or completely misaligned. When the external and internal guide holes are completely overlapped, liquid nitrogen flows... The cavity is maximized to communicate with the seafood freezing chamber through the outer and inner guide holes, allowing liquid nitrogen to flow into the seafood freezing chamber through the outer and inner guide holes to achieve seafood freezing. When the outer and inner guide holes are completely misaligned, the liquid nitrogen flow cavity and the seafood freezing chamber are sealed and isolated, and liquid nitrogen cannot enter the seafood freezing chamber. However, during this process, as the degree of overlap between the outer and inner guide holes gradually decreases, the communication path between the liquid nitrogen flow cavity and the seafood freezing chamber changes, thereby controlling the liquid nitrogen flow rate and achieving a precise and uniform freezing effect.

[0010] As a further description of the above technical solution: temperature sensors are installed on the inner wall of the seafood freezing chamber above and below each partition cooling mechanism. Based on this, when the temperature sensor at the corresponding position senses that the current temperature is lower or higher than the preset temperature value, it controls the partition cooling mechanism at the corresponding position to change the liquid nitrogen flow rate, thereby achieving accurate temperature control of each area in the seafood freezing chamber.

[0011] As a further description of the above technical solution: the liquid nitrogen storage chamber is equipped with a main liquid nitrogen delivery pipe and a branch liquid nitrogen delivery pipe. The main liquid nitrogen delivery pipe is connected to the liquid nitrogen storage tank, and the branch liquid nitrogen delivery pipe is connected to the main liquid nitrogen delivery pipe. A main control valve is installed on the main liquid nitrogen delivery pipe to control the opening and closing of the main liquid nitrogen delivery pipe. One end of the branch liquid nitrogen delivery pipe is connected to each of the partitioned cooling mechanisms, and each connection point between the branch liquid nitrogen delivery pipe and each partitioned cooling mechanism is equipped with an independent electromagnetic control valve. The electromagnetic control valve can control the opening and closing of the pipeline between the branch liquid nitrogen delivery pipe and each partitioned cooling mechanism. Based on this, when it is necessary to independently control the temperature of a certain area in the aquatic product freezing chamber, it can also be controlled by directly closing or opening the corresponding electromagnetic control valve.

[0012] As a further description of the above technical solution: a side plate is fixedly installed at one end of the inner cavity by bolts, an electric push rod is installed inside the inner cavity, the bottom of the electric push rod is installed inside the side plate, and the front end of the electric push rod is installed inside the control guide plate, so that the electric push rod can push the control guide plate to move horizontally in the inner cavity, thereby realizing the change of state between the outer guide hole and the inner guide hole.

[0013] As a further description of the above technical solution: Side doors are installed on both sides of the freezer in the seafood freezing compartment. The side doors can be opened by flipping upwards. The main board near the side door is rotatably connected to the inner wall of the seafood freezing compartment via a pivot, so that the main board can rotate to form an inclined structure with the height gradually decreasing from inside the seafood freezing compartment to the outside. Based on this, the frozen seafood on the main board can be tilted by controlling the rotation of the main board to form a tilting structure, and the seafood can be directly tilted from the side door position to achieve the effect of rapid unloading.

[0014] As a further description of the above technical solution: a motor is installed at one end of the refrigeration unit, and the output shaft of the motor is connected to the rotating shaft on the main board through a reducer, so that the motor can drive the main board to rotate through the rotating shaft to perform unloading operations.

[0015] As a further description of the above technical solution: a support rod is installed along the length of the interior of the seafood freezing chamber, and the bottom of the main board is provided with a buckle groove that can be adapted to the support rod. When the main board is in a horizontal state, the support rod is engaged below the buckle groove. Based on this, when the seafood freezing chamber is fully loaded with seafood for freezing, the support rod can help support the weight of the main board, thereby preventing the main board from tipping over when carrying seafood.

[0016] As a further description of the above technical solution: the inner wall of the aquatic product freezing chamber is equipped with a branch pipe connector A, and one end of the control guide plate is equipped with a branch pipe connector B that can cooperate with the branch pipe connector A, so that when the main board is rotated to the tilt position, the branch pipe connector A and the branch pipe connector B are separated, and when the main board is rotated to the horizontal position, the branch pipe connector A and the branch pipe connector B are connected. Based on this, it is only necessary to connect the branch pipe connector A and the branch pipe connector B to introduce liquid nitrogen when the main board is rotated to the horizontal position for aquatic product freezing.

[0017] As a further description of the above technical solution: a branch pipe connector guide groove is provided below the main board at the branch pipe connector A, which can accommodate the branch pipe connector A. The branch pipe connector guide groove adopts an arc-shaped structure, and the center of the branch pipe connector guide groove coincides with the axis of rotation of the main board. Therefore, when the main board rotates, it will not be blocked by the branch pipe connector A. Furthermore, when the main board rotates to a horizontal position for seafood freezing, the branch pipe connector A can pass into the branch pipe connector guide groove and connect with the branch pipe connector B.

[0018] As a further description of the above technical solution: Each set of the partitioned cooling mechanism is provided with two main boards. The two main boards are symmetrically installed at the same horizontal position in the seafood freezing chamber, so that seafood can be placed layer by layer during the placement process, which is convenient for placement. In addition, this ensures that there is a certain gap between each layer of seafood and the main board above during the placement process, which facilitates the introduction of liquid nitrogen for freezing of seafood.

[0019] In the above technical solution, the present invention provides a liquid nitrogen freezing equipment for aquatic product processing. This equipment sets a dividing and guiding cooling mechanism in the aquatic product freezing chamber. The dividing and guiding cooling mechanism can divide the aquatic product freezing chamber into multiple areas. When the aquatic product freezer is full of aquatic products, the liquid nitrogen can flow evenly into the aquatic products in each area through the guiding cooling mechanism, thereby achieving a uniform and rapid freezing effect and ensuring the quality of aquatic product freezing.

[0020] Through its structural design of the partitioned cooling mechanism, this equipment not only meets the need for "layered cooling" to enable rapid and uniform freezing of aquatic products, but also assists in the unloading of aquatic products for convenient unloading. At the same time, through the design of the connection structure that guides liquid nitrogen into the control guide plate, it not only ensures that it can assist in unloading, but also meets the needs of liquid nitrogen transportation. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of a liquid nitrogen freezing device for aquatic product processing provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a liquid nitrogen freezing device for aquatic product processing when it is opened, as provided by the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of a liquid nitrogen freezing device for aquatic product processing when it is opened, provided by the present invention.

[0024] Figure 4 A schematic diagram of a partitioned cooling mechanism in a liquid nitrogen freezing device for aquatic product processing provided by the present invention;

[0025] Figure 5 A schematic diagram of the electric push rod installation structure in a liquid nitrogen freezing equipment for aquatic product processing provided by the present invention;

[0026] Figure 6 This invention provides a schematic diagram of the liquid nitrogen guide plate installation structure in a liquid nitrogen freezing equipment for aquatic product processing.

[0027] Figure 7 This is a schematic diagram of the structure of a liquid nitrogen freezing equipment for aquatic product processing when the main board rotates upward and the aquatic products are unloaded, provided by the present invention.

[0028] Figure 8 This invention provides a schematic diagram of the liquid nitrogen guide plate structure in a liquid nitrogen freezing equipment for aquatic product processing.

[0029] Figure Descriptions: 1. Refrigeration unit; 10. Liquid nitrogen storage chamber door; 11. Side-opening door; 12. Top-opening door; 13. Liquid nitrogen storage chamber; 14. Seafood freezing chamber; 140. Temperature sensor; 2. Liquid nitrogen storage tank; 20. Liquid nitrogen main pipe; 21. Electromagnetic control valve; 22. Liquid nitrogen branch pipe; 220. Branch pipe connector A; 23. Main control valve; 3. Separating cooling mechanism; 30. Main board; 300. Heating plate; 301. External guide hole; 302. Socket; 303. Side plate; 304. Electric push rod; 305. Inner cavity; 306. Branch pipe connector guide groove; 31. Support rod; 32. Rotating shaft (32); 33. Control guide plate; 330. Branch pipe connector B; 331. Liquid nitrogen flow cavity; 332. Internal guide hole; 4. Motor. Detailed Implementation

[0030] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures. Example 1

[0031] Reference Figures 1-8 This embodiment provides a technical solution: a liquid nitrogen freezing equipment for aquatic product processing, including a freezer 1. The freezer 1 is provided with a liquid nitrogen storage chamber 13 and an aquatic product freezing chamber 14. Multiple sets of partitioning and cooling mechanisms 3 are installed inside the aquatic product freezing chamber 14 from top to bottom. A liquid nitrogen storage tank 2 for supplying liquid nitrogen to the partitioning and cooling mechanisms 3 for aquatic product freezing is installed inside the liquid nitrogen storage chamber 13. A liquid nitrogen storage chamber door 10 is provided on the front side of the liquid nitrogen storage chamber 13.

[0032] The separating cooling mechanism 3 includes a main board 30 and a control guide plate 33. The main board 30 has an inner cavity 305, and the control guide plate 33 is movably assembled in the inner cavity 305. The control guide plate 33 has a liquid nitrogen flow cavity 331 for supplying liquid nitrogen. The main board 30 has an outer guide hole 301 on its surface, and the control guide plate 33 has an inner guide hole 332 on its surface. The control guide plate 33 can move horizontally in the inner cavity 305. The movement of the control guide plate 33 can make the outer guide hole 301 and the inner guide hole 332 either completely overlap or completely misalign.

[0033] By adopting the above technical solution:

[0034] When the outer guide hole 301 and the inner guide hole 332 are completely overlapped, the liquid nitrogen flow cavity 331 is maximized to communicate with the aquatic product freezing chamber 14 through the outer guide hole 301 and the inner guide hole 332, so that the liquid nitrogen flow cavity 331 can enter the aquatic product freezing chamber 14 through the outer guide hole 301 and the inner guide hole 332 to achieve aquatic product freezing. When the outer guide hole 301 and the inner guide hole 332 are completely non-overlapping, the liquid nitrogen flow cavity 331 is sealed and isolated from the aquatic product freezing chamber 14, and liquid nitrogen cannot enter the aquatic product freezing chamber 14. During this process, as the overlap of the outer guide hole 301 and the inner guide hole 332 gradually decreases, the communication path between the liquid nitrogen flow cavity 331 and the aquatic product freezing chamber 14 changes, thereby realizing the control of liquid nitrogen flow rate and achieving a precise and uniform freezing effect.

[0035] In summary, this device, by setting a partitioning and cooling mechanism 3 in the seafood freezing chamber 14, can divide the seafood freezing chamber 14 into multiple areas. When the seafood fills the entire seafood freezing chamber 14, the partitioning and cooling mechanism 3 can guide liquid nitrogen to flow evenly into the seafood in each area, thereby achieving a uniform and rapid freezing effect.

[0036] Specifically, such as Figures 1-3 As shown, in order to accurately control the temperature of each area in the seafood freezing chamber 14, in this embodiment, temperature sensors 140 are installed on the inner wall of the seafood freezing chamber 14 above and below each partition cooling mechanism 3. Based on this, when the temperature sensor 140 at the corresponding position senses that the current temperature is lower or higher than the preset temperature value, it controls the partition cooling mechanism 3 at the corresponding position to change the liquid nitrogen flow rate, thereby achieving accurate temperature control of each area in the seafood freezing chamber 14.

[0037] Specifically, such as Figures 1-3 As shown, in order to achieve the transfer of liquid nitrogen, in this embodiment, the liquid nitrogen storage chamber 13 is equipped with a liquid nitrogen main pipe 20 and a liquid nitrogen branch pipe 22. The liquid nitrogen main pipe 20 is connected to the liquid nitrogen storage tank 2, and the liquid nitrogen branch pipe 22 is connected to the liquid nitrogen main pipe 20. A main control valve 23 is installed on the liquid nitrogen main pipe 20 to control the opening and closing of the liquid nitrogen main pipe 20. One end of the liquid nitrogen branch pipe 22 is connected to each of the partitioned cooling mechanisms 3, and each connection position between the liquid nitrogen branch pipe 22 and each partitioned cooling mechanism 3 is equipped with an independent electromagnetic control valve 21. The electromagnetic control valve 21 can control the opening and closing of the pipeline between the liquid nitrogen branch pipe 22 and each partitioned cooling mechanism 3. Based on this, when it is necessary to independently control the temperature of a certain area in the aquatic product freezing chamber 14, it can also be controlled by directly closing or opening the corresponding electromagnetic control valve 21.

[0038] Specifically, such as Figure 5As shown, in order to realize the movement control of the control guide plate 33 in the separation cooling mechanism 3, in this embodiment, a side plate 303 is fixedly installed at one end of the inner cavity 305 by bolts, and an electric push rod 304 is installed inside the inner cavity 305. The bottom of the electric push rod 304 is installed inside the side plate 303, and the front end of the electric push rod 304 is installed inside the control guide plate 33, so that the electric push rod 304 can push the control guide plate 33 to move horizontally in the inner cavity 305, thereby realizing the change of the state between the outer guide hole 301 and the inner guide hole 332. Example 2

[0039] Reference Figures 1-8 This embodiment provides a technical solution: a liquid nitrogen freezing equipment for aquatic product processing. Due to the large volume of the aquatic product freezing chamber 14, to facilitate unloading after freezing, this embodiment, based on Embodiment 1, has side doors 11 installed on both sides of the freezer 1 at the location of the aquatic product freezing chamber 14. The side doors 11 can be opened by flipping upwards. The main board 30, near the side doors 11, is rotatably connected to the inner wall of the aquatic product freezing chamber 14 via a pivot 32, allowing the main board 30 to rotate to form an inclined structure whose height gradually decreases from the inside to the outside of the aquatic product freezing chamber 14. Based on this, the frozen seafood on the main board 30 can be tilted by controlling the rotation of the main board 30, allowing the seafood to be poured directly from the side door 11 for quick unloading. Furthermore, to facilitate quick pouring of seafood when the main board 30 is tilted and to prevent the seafood from freezing, a heating plate 300 is embedded on the surface of the main board 30. When pouring seafood, the heating plate 300 can be turned on to melt the contact area between the seafood and the main board 30, thus preventing the seafood from freezing.

[0040] Specifically, such as Figure 3 As shown, in order to control the main board 30, in this embodiment, a motor 4 is installed at one end of the refrigeration unit 1. The output shaft of the motor 4 is connected to the rotating shaft 32 on the main board 30 through a reducer, so that the motor 4 can drive the main board 30 to rotate through the rotating shaft 32 to perform unloading operations.

[0041] Specifically, such as Figures 7-8 As shown, in order to prevent the main board 30 from tipping over when carrying seafood, in this embodiment, a support rod 31 is installed along the length direction inside the seafood freezing chamber 14. The bottom of the main board 30 is provided with a buckle groove 302 that can be adapted to the support rod 31. When the main board 30 is in a horizontal state, the support rod 31 is engaged under the buckle groove 302. Based on this, when the seafood freezing chamber 14 is fully loaded with seafood for freezing, the support rod 31 can help support the weight of the main board 30, thereby preventing the main board 30 from tipping over when carrying seafood. Example 3

[0042] Reference Figures 1-5 This embodiment provides a technical solution: a liquid nitrogen freezing device for aquatic product processing. Since the pipeline for conveying liquid nitrogen cannot use a flexible hose structure, and the main board 30 needs to rotate to unload the aquatic products, a special design is required for the connection structure between the liquid nitrogen conveying branch pipe 22 and the liquid nitrogen flow cavity 331 in the control guide plate 33. Based on embodiment 2, this embodiment has a branch pipe connector A220 installed on the inner wall of the aquatic product freezing chamber 14, and a branch pipe connector B330 installed at one end of the control guide plate 33 that can cooperate with the branch pipe connector A220. This allows the branch pipe connector A220 and branch pipe connector B330 to separate when the main board 30 rotates to an inclined position, and to connect when the main board 30 rotates to a horizontal position. Therefore, the connection between the branch pipe connector A220 and branch pipe connector B330 is only required when the main board 30 rotates to a horizontal position for aquatic product freezing, to introduce liquid nitrogen.

[0043] like Figure 6 As shown, in order to ensure that the main board 30 is not interfered with by the branch pipe connector A220 when rotating, in this embodiment, a branch pipe connector guide groove 306 is provided below the main board 30 at the branch pipe connector A220 to accommodate the branch pipe connector A220. The branch pipe connector guide groove 306 adopts an arc-shaped structure, and the center of the branch pipe connector guide groove 306 coincides with the axis of rotation 32 of the main board 30. Therefore, when the main board 30 rotates, it will not be blocked by the branch pipe connector A220. Furthermore, when the main board 30 rotates to a horizontal position for seafood freezing, the branch pipe connector A220 can pass into the branch pipe connector guide groove 306 and connect with the branch pipe connector B330.

[0044] Specifically, such as Figures 1-3 As shown, in order to facilitate the placement of aquatic products in the aquatic product freezing chamber 14, in this embodiment, each set of partitioned cooling mechanisms 3 is provided with two main boards 30. The two main boards 30 are symmetrically installed at the same horizontal position in the aquatic product freezing chamber 14, so that aquatic products can be placed layer by layer during the placement process, which is convenient for placement. In addition, this ensures that there is a certain gap between each layer of aquatic products and the main board 30 above during the placement process, which facilitates the introduction of liquid nitrogen for freezing of aquatic products. The top of the aquatic product freezing chamber 14 is equipped with an upper door 12 for placing aquatic products. It should be noted that when the upper door 12 is opened, it will not affect the rotation of the main board 30.

Claims

1. A liquid nitrogen freezing device for aquatic product processing, characterized in that, It includes a freezer (1), which has a liquid nitrogen storage chamber (13) and an aquatic product freezing chamber (14) inside. The aquatic product freezing chamber (14) is equipped with multiple sets of partitioned cooling mechanisms (3) from top to bottom. The liquid nitrogen storage chamber (13) is equipped with a liquid nitrogen tank (2) for supplying liquid nitrogen to the partitioned cooling mechanisms (3) for freezing aquatic products. The separating cooling mechanism (3) includes a main board (30) and a control guide plate (33). The main board (30) has an inner cavity (305). The control guide plate (33) is movably assembled in the inner cavity (305). The control guide plate (33) has a liquid nitrogen flow cavity (331) for liquid nitrogen flow. The main board (30) has an outer guide hole (301) on its surface. The control guide plate (33) has an inner guide hole (332) on its surface. The control guide plate (33) can move horizontally in the inner cavity (305). The movement of the control guide plate (33) can make the outer guide hole (301) and the inner guide hole (332) be in a completely overlapping state or a completely non-overlapping state.

2. The liquid nitrogen freezing equipment for aquatic product processing according to claim 1, characterized in that, Temperature sensors (140) are installed on the inner wall of the aquatic product freezing chamber (14) above and below each of the partitioned cooling mechanisms (3).

3. The liquid nitrogen freezing equipment for aquatic product processing according to claim 2, characterized in that, The liquid nitrogen storage chamber (13) is equipped with a liquid nitrogen main pipe (20) and a liquid nitrogen branch pipe (22). The liquid nitrogen main pipe (20) is connected to the liquid nitrogen storage tank (2), and the liquid nitrogen branch pipe (22) is connected to the liquid nitrogen main pipe (20). A main control valve (23) is installed on the liquid nitrogen main pipe (20). The main control valve (23) is used to control the opening and closing of the liquid nitrogen main pipe (20). One end of the liquid nitrogen branch pipe (22) is connected to each of the partitioned cooling mechanisms (3). Each connection position between the liquid nitrogen branch pipe (22) and each partitioned cooling mechanism (3) is equipped with an independent electromagnetic control valve (21). The electromagnetic control valve (21) can control the opening and closing of the pipeline between the liquid nitrogen branch pipe (22) and each partitioned cooling mechanism (3).

4. A liquid nitrogen freezing device for aquatic product processing according to any one of claims 1-3, characterized in that, One end of the inner cavity (305) is fixedly installed with a side plate (303) by bolts. An electric push rod (304) is installed inside the inner cavity (305). The bottom of the electric push rod (304) is installed inside the side plate (303), and the front end of the electric push rod (304) is installed inside the control guide plate (33), so that the electric push rod (304) can push the control guide plate (33) to move horizontally in the inner cavity (305).

5. The liquid nitrogen freezing equipment for aquatic product processing according to claim 1, characterized in that, The freezer (1) has side doors (11) installed on both sides of the seafood freezing chamber (14). The side doors (11) can be opened by flipping upwards. The main board (30) is rotatably connected to the inner wall of the seafood freezing chamber (14) via a pivot (32) on the side of the side door (11), so that the main board (30) can rotate to form an inclined structure that gradually decreases in height from the inside to the outside of the seafood freezing chamber (14).

6. The liquid nitrogen freezing equipment for aquatic product processing according to claim 5, characterized in that, A motor (4) is installed at one end of the freezer (1). The output shaft of the motor (4) is connected to the rotating shaft (32) on the main board (30) through a reducer, so that the motor (4) can drive the main board (30) to rotate through the rotating shaft (32).

7. The liquid nitrogen freezing equipment for aquatic product processing according to claim 5, characterized in that, The interior of the seafood freezing chamber (14) is equipped with a carrying pole (31) along its length. The bottom of the main board (30) is provided with a buckle groove (302) that can be adapted to the carrying pole (31). When the main board (30) is in a horizontal state, the carrying pole (31) is engaged under the buckle groove (302).

8. The liquid nitrogen freezing equipment for aquatic product processing according to claim 5, characterized in that, The inner wall of the aquatic product freezing chamber (14) is equipped with a branch pipe connector A (220), and one end of the control guide plate (33) is equipped with a branch pipe connector B (330) that can cooperate with the branch pipe connector A (220), so that when the main board (30) is rotated to the tilt position, the branch pipe connector A (220) and the branch pipe connector B (330) are separated, and when the main board (30) is rotated to the horizontal position, the branch pipe connector A (220) and the branch pipe connector B (330) are connected.

9. A liquid nitrogen freezing device for aquatic product processing according to claim 8, characterized in that, The main board (30) is provided with a branch pipe joint guide groove (306) below the branch pipe joint A (220) to accommodate the branch pipe joint A (220). The branch pipe joint guide groove (306) adopts an arc-shaped structure, and the center of the branch pipe joint guide groove (306) coincides with the axis of the rotating shaft (32) of the main board (30).

10. A liquid nitrogen freezing device for aquatic product processing according to claim 4, characterized in that, Each of the separated cooling mechanisms (3) is provided with two main boards (30), and the two main boards (30) are symmetrically installed at the same horizontal position in the seafood freezing chamber (14).

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