A contact-type low-temperature quick-freezing box for aquatic products

Abstract

The present invention discloses a contact-type low-temperature quick-freezing box for aquatic products, specifically relating to the field of rapid refrigeration, comprising a box body and a control center, wherein an automatic door is installed on the side of the box body, a lifting and flipping member is installed at the bottom of the inner cavity of the box body, a quick-freezing member is installed at the top of the inner cavity of the box body, a placement table is installed on the top of the lifting and flipping member, the inner wall of the box body is provided with a limiting groove that is mutually compatible with the placement table, the inner wall of the box body is provided with a storage box that is symmetrical to the limiting groove, and the lifting and flipping member includes a second hydraulic rod, which is installed at the bottom of the inner cavity of the box body. The present invention senses the pressure of the quick-freezing and cooling member on the horizontal plane through a first pressure sensing end, thereby adjusting the pressure so that each area of ​​the aquatic product receives the same pressure, thereby avoiding the problem that the contact surface is constant and difficult to adjust during the quick-freezing process, resulting in uneven force on the aquatic product, thereby causing excessive cell damage rate.

Description

Technical Field

[0001] The present invention relates to the field of rapid refrigeration technology, and more particularly to a contact-type low-temperature quick-freezing box for aquatic products. Background Art

[0002] Contact-type low-temperature quick-freezing technology achieves rapid heat transfer through direct contact between a highly conductive medium and food. Its core advantage lies in overcoming the heat transfer bottleneck of traditional air-freezing methods. It can reduce the core temperature of aquatic products to below -18°C within tens of minutes, significantly shortening the ice crystal formation cycle. Compared to traditional cold storage freezing, this technology can control the ice crystal size within aquatic product muscle tissue to below 50μm, thereby reducing mechanical damage to cells and lowering the post-thawing juice loss rate to less than 1.5%, achieving sensory quality close to that of fresh ingredients.

[0003] The mainstream equipment currently used in industrial applications includes two technical routes: plate freezers and steel belt contact quick freezers:

[0004] Plate freezer: The hydraulic system drives the upper and lower metal plates to apply 0.05-0.3MPa linear pressure to the material, forcing the aquatic product to fit tightly against the freezing plate, achieving two-way conduction freezing;

[0005] Steel belt quick freezer: uses double-layer stainless steel belts to clamp materials for continuous transportation, suitable for large-scale processing of thin products such as shrimp and fish fillets.

[0006] Although the above equipment can shorten the freezing time to 1 / 5-1 / 3 of the traditional method, the following technical bottlenecks still exist in practical applications:

[0007] 1. Tissue damage caused by pressure adaptability defects is uncontrollable;

[0008] Existing equipment uses a fixed-gap extrusion mechanism, whose pressure output relies solely on a preset mechanical stroke and is unable to sense real-time changes in material properties such as thickness and elastic modulus. For example, when processing fish fillets with a thickness deviation of ±10%, the actual contact pressure can fluctuate by up to ±25%, leading to excessive compression of localized muscle fibers. For easily deformable materials like shrimp, static extrusion can easily cause abdominal fractures, seriously affecting the product's value.

[0009] 2. The quick freezing advantage is weakened due to the deterioration of heat transfer efficiency;

[0010] Due to the non-uniformity of pressure distribution, dynamic contact thermal resistance is generated between the material and the cold source interface, which is specifically manifested as: an air gap thermal barrier is formed in the low-pressure area, significantly reducing the effective heat transfer area; to compensate for the thermal resistance fluctuation, the existing system is forced to extend the freezing time to 1.3-1.8 times the theoretical value, resulting in an expansion of the ice crystal growth time window and the loss of the core value of quick-freezing technology.

[0011] 3. Rigid temperature control strategies exacerbate energy waste;

[0012] Existing equipment uses a fixed plate temperature setting and lacks a dynamic response to the material heat load: when the cooling demand reaches its peak in the initial freezing stage, the plate temperature recovers with a lag, prolonging the phase change time; and in the final overcooling stage, it still maintains low-temperature operation, resulting in more than 30% ineffective energy consumption. Summary of the Invention

[0013] In order to overcome the above-mentioned defects of the prior art, the present invention provides a contact-type low-temperature quick-freezing box for aquatic products. Through the following scheme, it solves the defects proposed in the above-mentioned background technology, such as single data dimension, static solidification of analysis model, and one-sided neglect of practical relevance by the evaluation system, which restricts the accuracy of management strategies.

[0014] To achieve the above-mentioned object, the present invention provides the following technical solution: a contact-type low-temperature quick-freezing box for aquatic products, comprising a box body and a control center, an automatic door installed on the side of the box body, a lifting and flipping member installed at the bottom of the box body inner cavity, a quick-freezing unit installed at the top of the box body inner cavity, a placement table installed on the top of the lifting and flipping member, a limiting groove mutually adapted for the placement table is opened on the inner wall of the box body, and a storage box symmetrically connected to the limiting groove is installed on the inner wall of the box body;

[0015] The lifting and flipping member includes a second hydraulic rod, which is installed at the bottom of the inner cavity of the box, and the top of the second hydraulic rod is fixedly connected to the ground of the placement table. The top of the second hydraulic rod is installed with a flipping member for tilting the placement table, and the side of the placement table is installed with a limit plate adapted to the limit groove;

[0016] The quick-freezing element includes a stabilizing plate, a side plate connected to the inner wall of the box is installed on the side of the stabilizing plate, a first hydraulic rod is installed on the top of the stabilizing plate, and a quick-freezing and cooling element is installed on the bottom of the first hydraulic rod.

[0017] The output end of the control center is electrically connected to the second hydraulic rod, the first hydraulic rod and the quick-freezing and cooling component. The output end of the first hydraulic rod is electrically connected to the first pressure end located on the surface of the quick-freezing and cooling component. The control center is electrically connected to the first pressure end and the flipping component through the data analysis end.

[0018] Preferably, the outer wall of the box body is provided with a heat dissipation component corresponding to the lifting and flipping component and the quick-freezing component.

[0019] Preferably, the number of the storage boxes is set to be no less than three, and the distance between each storage box is greater than the thickness of the placement table plus thirty to fifty centimeters.

[0020] Preferably, the width of the limiting plate is set to be the same as the width of the limiting groove, and the depth of the limiting groove is three times the thickness of the limiting plate.

[0021] Preferably, the quick-freezing cooling component is a rubber body covered with a metal sheet, the metal sheet is connected to the cooling component, the first pressure sensing end is located in the middle of the quick-freezing cooling component, and the contact surface of the first pressure sensing end is parallel to the bottom surface of the quick-freezing cooling component.

[0022] Preferably, the calculation process of the first hydraulic rod adjustment distance of the data analysis terminal is as follows:

[0023] Step 1: Data collection: The first pressure sensing end of each quick-freezing and cooling element detects the contact pressure in real time, which is recorded as P i Then, Pi is filtered by sliding average or Kalman filter to eliminate sensor noise and obtain a stable pressure value, the base P 实i ;

[0024] It should be further explained that i=1, 2, 3...N, where N is the number of quick freezing and cooling elements 54.

[0025] Step 2: Calculate the average pressure. The calculation formula is as follows:

[0026] ,in is the average pressure;

[0027] Step 3: Calculate the pressure deviation value. The calculation formula is as follows:

[0028] ,in is the pressure deviation value;

[0029] Step 4: Calculate the displacement of the first hydraulic rod using the following formula:

[0030] , where a1, a2, and a3 are the proportional, integral, and differential coefficients determined by calibration, respectively, and t is the time.

[0031] Preferably, the temperature dynamic adjustment process of the data analysis terminal is as follows:

[0032] Step 1: collecting the displacement of the first hydraulic rod;

[0033] Step 2: Calculate the temperature dynamic adjustment amount according to the displacement of the first hydraulic rod.

[0034] Technical effects and advantages of the present invention:

[0035] The present invention senses the horizontal pressure of the quick-freezing and cooling component through the first pressure sensing end, thereby adjusting the pressure so that each area of ​​the aquatic product receives the same pressure, avoiding the problem of uneven force on the aquatic product caused by the constant contact surface that is difficult to adjust during the quick-freezing process, thereby causing excessive cell damage rate.

[0036] The present invention achieves nearly consistent quick-freezing effects in each area by adjusting the distance of the first hydraulic rod in conjunction with temperature adjustment, thereby avoiding the problem of different quick-freezing effects in the bottom areas of different quick-freezing and cooling components.

[0037] The present invention adopts multiple quick-freezing and cooling components for quick freezing and reasonably utilizes the quick-freezing cold source, thereby avoiding the problem of unnecessary energy consumption caused by quick freezing on a single fixed plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the method structure of the present invention.

[0039] Figure 2 For the present invention Figure 1 Schematic diagram of the external structure.

[0040] Figure 3 For the present invention Figure 1 Schematic diagram of the side structure.

[0041] Figure 4 For the present invention Figure 1 Schematic diagram of the internal structure.

[0042] Figure 5 For the present invention Figure 4 Schematic diagram of the structural method at point A.

[0043] Figure 6 This is a schematic structural diagram of the quick-frozen component of the present invention.

[0044] Figure 7 It is a schematic diagram of the lifting and flipping member structure of the present invention.

[0045] Figure 8 This is a control block diagram of the present invention.

[0046] Figure numerals: 1. Box body; 2. Automatic door; 3. Lifting and flipping part; 31. Second hydraulic rod; 32. Flipping part; 4. Placement table; 41. Limiting plate; 42. Limiting groove; 5. Quick-freezing part; 51. Stabilizing plate; 52. Side plate; 53. First hydraulic rod; 54. Quick-freezing and cooling part; 6. Storage box. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] Example 1: As shown in the attached Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The illustrated embodiment of a contact-type low-temperature quick-freezing box for aquatic products comprises a box body 1, an automatic door 2 mounted on the side of the box body 1, a lifting and flipping member 3 mounted at the bottom of the inner cavity of the box body 1, a quick-freezing unit 5 mounted at the top of the inner cavity of the box body 1, a placement table 4 mounted on the top of the lifting and flipping member 3, a limiting groove 42 adapted to fit the placement table 4 is formed on the inner wall of the box body 1, and a storage box 6 symmetrically mounted on the inner wall of the box body 1 with respect to the limiting groove 42;

[0049] It should be noted that in this embodiment, the outer wall of the box body 1 is provided with a heat dissipation member corresponding to the lifting and flipping member 3 and the quick-freezing member 5, wherein the heat dissipation member includes any one or more combinations of a zigzag multi-faceted panel, a heat dissipation hole, and an air-cooling component. The setting state of the heat dissipation member is determined by the power of the lifting and flipping member 3 and the quick-freezing member 5, which will not be described in detail in this embodiment.

[0050] It should be further explained that the automatic door 2 is an automatically controlled door, and in the operating state of this embodiment, a transmission member corresponding to the automatic door 2 is placed on the outside of the box 1. The transmission member can be set as a conventional transmission belt assembly. The transmission member and the lifting platform mentioned above are both conventional parts. The installation position and starting conditions of the transmission member are not specifically limited in this embodiment;

[0051] like Figure 5 、 Figure 6 and Figure 7 As shown, the lifting and flipping member 3 includes a second hydraulic rod 31, which is installed at the bottom of the inner cavity of the box body 1. The top of the second hydraulic rod 31 is fixedly connected to the ground of the placement table 4. The top of the second hydraulic rod 31 is installed with a flipping member 32 for tilting the placement table 4. The side of the placement table 4 is installed with a limit plate 41 adapted to the limit groove 42;

[0052] It should be noted that in this embodiment, the number of the storage boxes 6 is set to be no less than three. In order to ensure the storage space inside the box body 1, the distance between each storage box 6 is greater than the thickness of the placement table 4 plus 30 to 50 centimeters. In order to ensure that the aquatic products can be easily placed in the storage box 6 after quick freezing, and to maximize the use of the space inside the box body 1;

[0053] It should be further noted that the width of the limiting plate 41 is set to be the same as the width of the limiting groove 42, and the depth of the limiting groove 42 is three times the thickness of the limiting plate 41. In order to ensure that when the flip member 32 pushes the placement table 4, the limiting plate 41 has sufficient movable space to meet the requirements of tilting with the placement table 4, thereby facilitating the tilting of the frozen aquatic products into the storage box 6;

[0054] It should also be noted that a rotating shaft is provided at the connection between the second hydraulic rod 31 and the placement table 4 to facilitate the tilting of the placement table 4. As for the setting method of the rotating shaft, it is a conventional support method and is not specifically limited in this embodiment.

[0055] The quick-freezing unit 5 includes a stabilizing plate 51, and a side plate 52 connected to the inner wall of the box body 1 is installed on the side of the stabilizing plate 51. A first hydraulic rod 53 is installed on the top of the stabilizing plate 51, and a quick-freezing and cooling unit 54 is installed on the bottom of the first hydraulic rod 53 below the stabilizing plate 51. The number of the quick-freezing and cooling units 54 is nine, and each group of three is a group.

[0056] It should be noted that in this embodiment, the quick-freezing cooling element 54 is a rubber body covered with a metal sheet, the metal sheet is connected to the cooling element, and a first pressure sensing end is provided in the middle of the quick-freezing cooling element 54. The contact surface of the first pressure sensing end is parallel to the bottom surface of the quick-freezing cooling element 54. The metal sheet is covered on the rubber body to facilitate the quick-freezing cooling element 54 to fit as close to the surface of the aquatic product as possible, thereby increasing the cooling effect. The first pressure sensing end is used to receive the pressure generated by the aquatic product during the freezing process and output the pressure value to the data analysis end, thereby The data analysis terminal analyzes the distance that the corresponding first pressure rod needs to be adjusted, thereby ensuring that the pressure in the bottom area of ​​each quick-freezing and cooling element 54 is consistent. Because the pressure in the bottom area of ​​the quick-freezing and cooling element 54 is consistent and the material of the quick-frozen aquatic products is the same, it is only necessary to adjust the temperature of the cooling element according to the distance between the bottom surface of the quick-freezing and cooling element 54 and the placement table 4, thereby affecting the temperature of the metal sheet, so that the quick-freezing effect of the aquatic products in different quick-freezing and cooling elements 54 is consistent, thereby maximizing the quick-freezing effect, which is specifically the water-locking effect of the cells and the loss rate of thawed juice;

[0057] like Figures 1-8 The contact-type low-temperature quick-freezing box for aquatic products shown in the figure also includes a control center, the output end of which is electrically connected to the second hydraulic rod 31, the first hydraulic rod 53, and the quick-freezing and cooling element 54. The output end of the first hydraulic rod 53 is electrically connected to a first pressure end located on the surface of the quick-freezing and cooling element 54. The control center is electrically connected to the first pressure end and the flip element via a data analysis end.

[0058] The calculation process of the first hydraulic rod adjustment distance on the data analysis end is as follows:

[0059] Step 1: Data collection: The first pressure sensing end of each quick-freezing and cooling element 54 detects the contact pressure in real time, which is recorded as P i Then, Pi is filtered by sliding average or Kalman filter to eliminate sensor noise and obtain a stable pressure value, the base P 实i ;

[0060] It should be further explained that i=1, 2, 3...N, where N is the number of quick freezing and cooling elements 54.

[0061] Step 2: Calculate the average pressure. The calculation formula is as follows:

[0062] ,in is the average pressure;

[0063] Step 3: Calculate the pressure deviation value. The calculation formula is as follows:

[0064] ,in is the pressure deviation value;

[0065] Step 4: Calculate the displacement of the first hydraulic rod using the following formula:

[0066] , wherein a1, a2, and a3 are proportional, integral, and differential coefficients determined by calibration, respectively, and t is time. The method for obtaining a1, a2, and a3 is the Ziegler-Nichols empirical method. As for the specific obtaining method, this embodiment does not specifically limit it.

[0067] The temperature dynamic adjustment process of the data analysis terminal is as follows:

[0068] Step 1: collecting the displacement of the first hydraulic rod;

[0069] Step 2: Calculate the temperature dynamic adjustment amount according to the displacement of the first hydraulic rod.

[0070] It should be noted that the displacement and the temperature dynamic adjustment amount are linearly related and are calculated in conjunction with the temperature control coefficient, wherein the temperature control coefficient is calibrated according to the size of the specific box 1 in conjunction with the experiment, and this embodiment does not make any specific calculation limitations;

[0071] In summary, through the above calculation process, the refrigeration temperature and horizontal height of each quick-freezing and cooling component 54 are accurately determined to the maximum extent, thereby ensuring the freezing effect of the area below each quick-freezing and cooling component 54.

[0072] Here’s how it works:

[0073] Preparation stage:

[0074] Open the automatic door 2, place the conveyor, and then the aquatic products on the conveyor fall onto the placement table 4 one after another;

[0075] Quick freezing stage:

[0076] After the aquatic product is placed on the top, the lifting and turning part 3 is started, so that the placing table 4 rises and the quick-freezing part 5 is started. At this time, the quick-freezing and cooling part 54 begins to contact the aquatic product. The first hydraulic rod is adjusted according to the pressure value felt by the first pressure sensing end, and finally the pressure value felt by all the first pressure sensing ends is made to be the same. Then, the surface temperature of the quick-freezing and cooling part 54 is adjusted according to the specific adjustment of each first hydraulic rod until quick freezing is completed. The quick freezing time is generally set to 5-15 minutes;

[0077] Closing stage:

[0078] When quick freezing is completed, the control center starts the flip part 32, which drives the placement table 4 to tilt, so that the quick-frozen aquatic products enter the storage box 6, and then the placement table 4 is restored, and the quick freezing stage is repeated until the storage box 6 in the box body 1 is full, and finally the automatic door 2 is closed to complete the quick freezing storage.

[0079] Examples 2-5

[0080] The difference between Examples 2-5 and Example 1 lies in the number of quick-freezing and cooling elements 54. In Example 2, the number of quick-freezing and cooling elements 54 is sixteen, and they are divided into four groups of four. In Example 3, the number of quick-freezing and cooling elements 54 is twenty-five, and they are divided into five groups of five. In Example 4, the number of quick-freezing and cooling elements 54 is four, and they are divided into two groups of two. In Example 5, the number of quick-freezing and cooling elements 54 is one.

[0081] Experimental example

[0082] The same aquatic product was quick-frozen using Examples 1-5, with the same quick-freezing time each time. The ice crystal size of the aquatic product was then collected and thawed to obtain the juice loss rate of the aquatic product. The following table was finally prepared:

[0083]

[0084] From the above table data, we can know that:

[0085] The more quick-freezing and cooling components 54 there are, the smaller the ice crystal size is and the lower the juice loss rate is. At the same time, the more quick-freezing and cooling components 54 there are, the higher the technical cost is and the more difficult the technical installation is.

[0086] Secondly: The drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures may refer to conventional designs. The same embodiment and different embodiments of the present invention may be combined with each other without conflict.

[0087] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A contact-type low-temperature quick-freezing box for aquatic products, characterized in that: The invention comprises a box body (1) and a control center, wherein an automatic door (2) is installed on the side of the box body (1), a lifting and flipping member (3) is installed at the bottom of the inner cavity of the box body (1), a quick-freezing member (5) is installed at the top of the inner cavity of the box body (1), a placement table (4) is installed on the top of the lifting and flipping member (3), the inner wall of the box body (1) is provided with a limiting groove (42) adapted to the placement table (4), and the inner wall of the box body (1) is provided with a storage box (6) symmetrical to the limiting groove (42); The lifting and turning member (3) includes a second hydraulic rod (31), the second hydraulic rod (31) is installed at the bottom of the inner cavity of the box body (1), the top of the second hydraulic rod (31) is installed with a turning member (32) for tilting the placement table (4), and the side of the placement table (4) is installed with a limiting plate (41) adapted to the limiting groove (42); The quick-freezing element (5) comprises a stabilizing plate (51), a side plate (52) connected to the inner wall of the box body (1) is installed on the side of the stabilizing plate (51), a first hydraulic rod (53) is installed on the top of the stabilizing plate (51), and a quick-freezing and cooling element (54) located below the stabilizing plate (51) is installed on the bottom of the first hydraulic rod (53); The output end of the control center is electrically connected to the second hydraulic rod (31), the first hydraulic rod (53) and the quick-freezing and cooling component (54); the output end of the first hydraulic rod (53) is electrically connected to the first pressure end located on the surface of the quick-freezing and cooling component (54); and the control center is electrically connected to the first pressure end and the flip component via the data analysis end.

2. The contact-type low-temperature quick-freezing box for aquatic products according to claim 1, characterized in that: The outer wall of the box body (1) is provided with a heat dissipation component corresponding to the quick-freezing component (5).

3. The contact-type low-temperature quick-freezing box for aquatic products according to claim 1, characterized in that: The number of the storage boxes (6) is at least three, and the distance between each storage box (6) is greater than the thickness of the placement table (4) plus thirty to fifty centimeters.

4. The contact-type low-temperature quick-freezing box for aquatic products according to claim 1, characterized in that: The width of the limiting plate (41) is set to be the same as the width of the limiting groove (42), and the depth of the limiting groove (42) is three times the thickness of the limiting plate (41).

5. The contact-type low-temperature quick-freezing box for aquatic products according to claim 1, characterized in that: The quick-freezing cooling component (54) is a rubber body covered with a metal sheet, the metal sheet is connected to the cooling component, the first pressure end is located in the middle of the quick-freezing cooling component (54), and the contact surface of the first pressure end is parallel to the bottom surface of the quick-freezing cooling component (54).

6. The contact-type low-temperature quick-freezing box for aquatic products according to claim 1, characterized in that: The calculation process of the first hydraulic rod adjustment distance on the data analysis end is as follows: Step 1, data collection: the first pressure end of each quick freezing and cooling element (54) detects the contact pressure in real time, which is recorded as P i Then, Pi is filtered by sliding average or Kalman filtering to eliminate sensor noise and obtain a stable pressure value P 实i ; Where i=1, 2, 3...N, N is the number of quick-freezing and cooling parts (54) Step 2: Calculate the average pressure. The calculation formula is as follows: ,in is the average pressure; Step 3: Calculate the pressure deviation value. The calculation formula is as follows: ,in is the pressure deviation value; Step 4: Calculate the displacement of the first hydraulic rod using the following formula: , where a1, a2, and a3 are the proportional, integral, and differential coefficients determined by calibration, respectively.

7. The contact-type low-temperature quick-freezing box for aquatic products according to claim 6, characterized in that: The temperature dynamic adjustment process of the data analysis terminal is as follows: Step 5: collecting the displacement of the first hydraulic rod; Step 6: Calculate the temperature dynamic adjustment amount according to the displacement of the first hydraulic rod. The displacement and the temperature dynamic adjustment amount are in a linear relationship and are calculated in combination with the temperature control coefficient.

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