A quick freezing machine based on permanent magnetic field assisted freezing

Abstract

The invention relates to the technical field of food quick freezing, and discloses a quick freezing machine based on permanent magnetic field assisted freezing, comprising: a quick freezing storehouse, which has a quick freezing mechanism for quick freezing food; a permanent magnetic generating device, which is used to generate a constant or variable permanent magnetic field, the permanent magnetic field being used to be distributed on food, and being used to be relatively stationary or relatively moving with the food; the invention ensures the quick freezing effect of food on the basis of energy saving, and overcomes the prejudice of existing technicians in the cognition of food quick freezing that a magnetic field can only be applied by an energized coil when the food is about to undergo a phase change, and that the radiation range of the permanent magnetic field generated by the existing permanent magnet is relatively small, making it difficult to cover the food with the permanent magnetic field well.

Description

Technical Field

[0001] The invention relates to the technical field of food quick freezing, and in particular to a quick freezing machine based on permanent magnetic field assisted freezing. Background Art

[0002] Freezing is a commonly used food preservation method that reduces the temperature of food to below -18°C, thereby inhibiting various biochemical reactions, preventing food from spoiling, and extending the shelf life. During the freezing process, the moisture inside the food will change from liquid to solid at around 0°C, which will cause certain damage to the quality of the food. In order to reduce this damage, it is usually necessary to increase the freezing rate to reduce the size of ice crystals and reduce the mechanical damage to the internal structure of the food, but this often requires a high energy consumption.

[0003] With the emergence of new refrigeration technologies, the application of the non-thermal effect of magnetic fields combined with food processing technology to micro-process food to keep its original color, flavor and nutrition has become an emerging interdisciplinary field. Based on the added magnetic field, the generation rate of ice nuclei can be increased, so that the ice crystals formed during the quick freezing of food are small and evenly distributed, which can greatly improve the quality of quick-frozen food.

[0004] However, when freezing food, most of the time, a powered coil is used to generate a constant or alternating magnetic field. Maintaining the magnetic field not only requires continuous power input, but also generates a lot of heat, which correspondingly reduces the refrigeration effect on the food. Compared with powered coils, existing permanent magnets do not need to be powered and can also generate magnetic fields. However, permanent magnets also have the problem that the magnetic field energy is uncontrollable and the magnetic field radiation range is relatively small.

[0005] Therefore, in order to save energy, existing technicians usually start the magnetic field when the water in the food is about to undergo a phase change to place the food in a magnetic field environment, and turn off the magnetic field when the food temperature is lower than a preset value. However, existing technicians do not realize that when freezing food, the timing of the phase change of the water in the food is not a necessary condition for applying a magnetic field to the food. Instead, the magnetic field can be applied to the food during the entire quick freezing process. In addition, considering that the radiation range of the permanent magnetic field generated by the permanent magnet is relatively small, it is difficult to cover the pre-quick frozen food with the permanent magnetic field. Based on these cognitive or technical prejudices, existing technicians have not realized in actual applications that the quick freezing effect of food can be improved by using a permanent magnetic field. Summary of the invention

[0006] The embodiment of the present invention provides a quick freezer based on permanent magnetic field assisted freezing, which is used to solve the problem that existing technicians, due to cognitive or technical prejudices, have not realized that the permanent magnetic field can be used to improve the quick freezing effect of food in practical applications.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a quick-freezing machine based on permanent magnetic field assisted freezing, comprising: a quick-freezing storage, which has a quick-freezing mechanism for quick-freezing food; a permanent magnetic generating device, which is used to generate a constant or variable permanent magnetic field, and the permanent magnetic field is used to be distributed on the food, and is used to be relatively stationary or relatively moving with the food.

[0008] Among them, it also includes: a continuous conveying device, one end of which is located at the food entrance of the quick-freezing storage, and the other end is located at the food exit of the quick-freezing storage; the permanent magnet generating device is arranged beside the continuous conveying device and / or on the conveying mechanism of the continuous conveying device.

[0009] Wherein, the permanent magnet generating device includes a first permanent magnet array, and the first permanent magnet array is arranged beside the continuous conveying device and arranged along the length direction of the continuous conveying device.

[0010] Among them, the permanent magnet generating device also includes a second permanent magnet array, which is arranged on the conveying mechanism of the continuous conveying device and arranged along the length direction of the continuous conveying device, and the second permanent magnet array corresponds to the first permanent magnet array.

[0011] Wherein, the continuous conveying device is a belt conveyor, and the belt conveyor is communicatively connected to a speed regulating device, and the speed regulating device is used to adjust the conveying speed of the conveying belt on the belt conveyor.

[0012] There are two groups of the first permanent magnet array, which are relatively arranged on both sides along the width direction of the continuous conveying device, and the first permanent magnet array includes a plurality of permanent magnets.

[0013] Wherein, the permanent magnets are arranged in sequence with the same magnetic pole orientation, or are arranged alternately in sequence with opposite magnetic pole orientations; the magnetic pole orientations of the permanent magnets correspondingly arranged along the width direction of the continuous conveying device are the same or opposite.

[0014] The cross section of the permanent magnet is in a straight line shape, and the permanent magnet is vertically arranged on one side along the width direction of the continuous conveying device.

[0015] The middle part of the permanent magnet is horizontally opposite to one side along the width direction of the continuous conveying device, one pole of the permanent magnet is located on the upper side of the continuous conveying device, and the other pole is located on the lower side of the continuous conveying device.

[0016] Wherein, the cross-section of the permanent magnet is in an arc shape; one pole of the permanent magnet is horizontally opposite to a side edge along the width direction of the continuous conveying device, and the other pole extends to the upper side of the continuous conveying device and tilts toward its inner side, or, the other pole of the permanent magnet extends to the lower side of the continuous conveying device and tilts toward its inner side; or, the middle part of the permanent magnet is horizontally opposite to a side edge along the width direction of the continuous conveying device, one pole of the permanent magnet extends to the upper side of the continuous conveying device and tilts toward its inner side, and the other pole extends to the lower side of the continuous conveying device and tilts toward its inner side.

[0017] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0018] The quick-freezing machine based on permanent magnetic field assisted freezing provided by the embodiment of the present invention, during the quick-freezing process of food in the quick-freezing warehouse, a permanent magnetic field is applied by a permanent magnetic generating device around the food to greatly increase the freezing rate of the food, reduce the size of ice crystals formed during the freezing process of the food, and improve the quality of the quick-frozen food. For the permanent magnetic generating device that generates the permanent magnetic field, no external power is required during operation and no heat is generated, thereby greatly saving energy. At the same time, during the quick-freezing process of the food, a permanent magnetic field that is relatively stationary can be applied to the food to ensure that the entire quick-freezing process of the food is in the environment of the permanent magnetic field, and based on the relative movement of the permanent magnetic field and the food, when the moisture inside the food is about to undergo a phase change, the permanent magnetic field can fully cover the area where the food is located to improve the quick-freezing effect of the food.

[0019] Therefore, the present invention ensures the quick freezing effect of food on the basis of saving energy, and overcomes the prejudice of existing technicians on the quick freezing of food that the magnetic field can only be applied by an energized coil when the food is about to undergo a phase change, and that the radiation range of the permanent magnetic field generated by the existing permanent magnet is relatively small, making it difficult to cover the food with the permanent magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a quick-freezing machine based on permanent magnetic field assisted freezing shown in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a first arrangement structure of a first permanent magnet array beside a continuous conveying device shown in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a second arrangement structure of the first permanent magnet array beside the continuous conveying device shown in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a third arrangement structure of the first permanent magnet array beside the continuous conveying device shown in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of a fourth arrangement structure of the first permanent magnet array beside the continuous conveying device shown in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of a first arrangement structure of permanent magnets on both sides along the width direction of a continuous conveying device according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of a second arrangement structure of permanent magnets on both sides along the width direction of the continuous conveying device shown in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of a third arrangement structure of permanent magnets on both sides along the width direction of the continuous conveying device shown in an embodiment of the present invention;

[0029] Fig. 9 This is a schematic diagram of a fourth arrangement structure of permanent magnets on both sides along the width direction of the continuous conveying device shown in an embodiment of the present invention;

[0030] Fig.10 It is a schematic diagram of the arrangement structure of permanent magnets on both sides along the width direction of the continuous conveying device and the permanent magnets arranged on the conveying mechanism of the continuous conveying device shown in an embodiment of the present invention.

[0031] In the figure, 1, quick-freezing storehouse; 2, continuous conveying device; 3, first permanent magnet array; 4, second permanent magnet array. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figure 1 The present embodiment provides a quick-freezing machine based on permanent magnetic field assisted freezing, comprising: a quick-freezing storage 1, the quick-freezing storage 1 having a quick-freezing mechanism for quick-freezing food; a permanent magnetic generating device, the permanent magnetic generating device is used to generate a constant or variable permanent magnetic field, the permanent magnetic field is used to be distributed on the food, and is used to be relatively stationary or relatively moving with the food.

[0035] Specifically, in the quick-freezing machine shown in this embodiment, during the quick-freezing process of the food in the quick-freezing storehouse 1, the permanent magnetic generating device applies a constant or variable permanent magnetic field around the food, so as to greatly increase the freezing rate of the food, reduce the size of ice crystals formed during the freezing process of the food, and improve the quality of the quick-frozen food. For the permanent magnetic generating device that generates the permanent magnetic field, no external power is required during operation and no heat is generated, thereby greatly saving energy. At the same time, during the quick-freezing process of the food, a permanent magnetic field that is relatively stationary with the food can be applied to the food to ensure that the entire quick-freezing process of the food is in the environment of the permanent magnetic field, and based on the relative movement of the permanent magnetic field and the food, when the moisture inside the food is about to undergo a phase change, the permanent magnetic field can fully cover the area where the food is located to improve the quick-freezing effect of the food.

[0036] Therefore, the present invention ensures the quick freezing effect of food on the basis of saving energy, and overcomes the prejudice of existing technicians on the quick freezing of food that the magnetic field can only be applied by an energized coil when the food is about to undergo a phase change, and that the radiation range of the permanent magnetic field generated by the existing permanent magnet is relatively small, making it difficult to cover the food with the permanent magnetic field.

[0037] It should be pointed out here that the permanent magnet generating device may include a plurality of permanent magnets known in the art, including an N pole and an S pole. The corresponding permanent magnets of the permanent magnet generating device may be arranged in an array or in a ring, as long as the permanent magnetic field generated by the permanent magnet generating device can fully cover the pre-quickly frozen food. At the same time, when there is no relative movement between the corresponding permanent magnets of the permanent magnet generating device, the permanent magnet generating device may emit a constant permanent magnetic field distributed on the food, and when there is relative movement between the corresponding permanent magnets of the permanent magnet generating device, the permanent magnet generating device may emit a changing permanent magnetic field distributed on the food.

[0038] In addition, the permanent magnetic field shown in this embodiment is relatively stationary with the food, which can be understood as the setting positions of the permanent magnetic generating device and the food are relatively stationary and unchanged, and ensure that the permanent magnetic field generated by the permanent magnetic generating device is distributed in the area where the food is located; accordingly, the permanent magnetic field shown in this embodiment moves relative to the food, which can be understood as at least one of the permanent magnetic generating device and the food is installed on a moving mechanism, so that when the permanent magnetic generating device is close to the food, the permanent magnetic field generated by the permanent magnetic generating device partially or completely covers the food, and when the permanent magnetic generating device is far away from the food, the permanent magnetic field generated by the permanent magnetic generating device is separated from the food.

[0039] Preferably, this embodiment also includes: a continuous conveying device 2, one end of the continuous conveying device 2 is located at the food entrance of the quick-freezing storage 1, and the other end is located at the food exit of the quick-freezing storage 1; a permanent magnet generating device is arranged beside the continuous conveying device 2 and / or is arranged on the conveying mechanism of the continuous conveying device 2.

[0040] Specifically, in actual design, in order to facilitate the transportation of food to the quick-freezing storehouse 1 for quick freezing, the present embodiment designs a continuous conveying device 2 for conveying food, and the continuous conveying device 2 can be a belt conveyor, a chain plate conveyor, etc., which are well known in the art. Therefore, when the permanent magnet generating device is separately arranged beside the continuous conveying device 2, the food conveyed on the conveying mechanism of the continuous conveying device 2 and the constant permanent magnetic field generated by the permanent magnet generating device can move relative to each other, and when the permanent magnet generating device is separately arranged on the conveying mechanism of the continuous conveying device 2, the food conveyed on the conveying mechanism and the constant permanent magnetic field generated by the corresponding permanent magnet generating device can be relatively stationary, and when the permanent magnet generating device is arranged beside the continuous conveying device 2 and on its conveying mechanism, the food can be placed in a changing magnetic field environment based on the relative movement between the permanent magnet generating devices, thereby better improving the quick freezing quality of the food to meet the quick freezing requirements of different foods.

[0041] At the same time, when the continuous conveying device 2 shown in this embodiment is preferably a belt conveyor, the belt conveyor can be communicated and connected to a speed regulating device. The speed regulating device can be a frequency converter known in the art. By connecting the output end of the frequency converter to the drive motor corresponding to its transmission belt on the belt conveyor, the transmission speed of the transmission belt on the belt conveyor can be regulated based on the adjustment of the rotation speed of the drive motor. Therefore, without changing the arrangement of the permanent magnet generating device itself, the time when the food enters the magnetic field environment and the time when it is in the magnetic field environment can be changed.

[0042] Based on the further improvement of the above embodiment, the permanent magnet generating device in this embodiment includes a first permanent magnet array 3, which is arranged beside the continuous conveying device 2 and arranged along the length direction of the continuous conveying device 2. Here, the first permanent magnet array 3 can be a plurality of permanent magnets arranged in a single row along the length direction of the continuous conveying device 2, and the first permanent magnet array 3 can be provided with multiple groups, and can be arranged on the sides of the continuous conveying device 2 along the circumferential direction.

[0043] Further, such as Figure 1 and Fig.10 As shown, the permanent magnet generating device shown in this embodiment also includes a second permanent magnet array 4, which is arranged on the conveying mechanism of the continuous conveying device 2 and arranged along the length direction of the continuous conveying device 2. The second permanent magnet array 4 corresponds to the first permanent magnet array 3. Here, the second permanent magnet array 4 can also use a plurality of permanent magnets arranged in a single row along the length direction of the continuous conveying device 2, and the number of permanent magnets specifically arranged can be the same as or different from that of the first permanent magnet array 3. When the continuous conveying device 2 starts the conveying operation of the food, the second permanent magnet array 4 will move with the conveying mechanism, that is, the second permanent magnet array 4 and the food placed on the conveying mechanism remain relatively still, but the corresponding permanent magnets of the second permanent magnet array 4 will interact with the permanent magnets of the first permanent magnet array 3 during the movement, which makes the food placed in a changing magnetic field environment during the conveying process, thereby better improving the quick freezing quality of the food and meeting the quick freezing requirements of different foods.

[0044] In a first preferred embodiment, if Figure 2 As shown, the first permanent magnet array 3 is provided with two groups, and is relatively arranged on both sides along the width direction of the continuous conveying device 2. Here, the first permanent magnet array 3 can be specifically installed on the fixing frames on both sides along the width direction of the continuous conveying device 2. The permanent magnets corresponding to the two groups of the first permanent magnet array 3 are arranged in sequence with the same magnetic pole orientation. For example, when the permanent magnets are all arranged vertically, the magnetic pole orientation of the permanent magnets is that the upper end of the permanent magnet is the N pole and the lower end is the S pole.

[0045] In a second preferred embodiment, Figure 3As shown, the first permanent magnet array 3 is provided with two groups, and is relatively arranged on both sides along the width direction of the continuous conveying device 2, and the permanent magnets corresponding to one group of the first permanent magnet array 3 are arranged in sequence with the same magnetic pole orientation, for example: the permanent magnets corresponding to the first permanent magnet array 3 are all arranged vertically, and the magnetic pole orientation of the permanent magnet is that the upper end of the permanent magnet is the N pole, and the lower end is the S pole; correspondingly, the permanent magnets corresponding to the other group of the first permanent magnet array 3 are also arranged in sequence with the same magnetic pole orientation, and the permanent magnets corresponding to the first permanent magnet array 3 are all arranged vertically, but the magnetic pole orientation of the permanent magnet is that the upper end of the permanent magnet is the S pole, and the lower end is the N pole.

[0046] In a third preferred embodiment, Figure 4 As shown, the first permanent magnet array 3 is provided with two groups, and is relatively arranged on both sides along the width direction of the continuous conveying device 2. The corresponding permanent magnets of the two groups of first permanent magnet arrays 3 are alternately arranged in sequence with opposite magnetic pole directions, and the magnetic pole directions of the permanent magnets correspondingly arranged along the width direction of the continuous conveying device 2 are the same.

[0047] In a fourth preferred embodiment, Figure 5 As shown, the first permanent magnet array 3 is provided with two groups, and is relatively arranged on both sides along the width direction of the continuous conveying device 2. The corresponding permanent magnets of the two groups of first permanent magnet arrays 3 are alternately arranged in sequence with opposite magnetic pole directions, and the magnetic pole directions of the permanent magnets correspondingly arranged along the width direction of the continuous conveying device 2 are opposite.

[0048] Based on the further improvement of the above embodiment, since the permanent magnet is usually in block shape, the cross section of the permanent magnet can be further set in this embodiment to be linear, and the permanent magnet is vertically arranged on one side along the width direction of the continuous conveying device 2. Since the two groups of first permanent magnet arrays 3 are relatively arranged on both sides along the width direction of the continuous conveying device 2, the permanent magnets correspondingly arranged along the width direction of the continuous conveying device 2 are arranged in parallel and oppositely, which is conducive to the permanent magnetic field generated by the permanent magnet being better radiated to the area where the conveying mechanism on the continuous conveying device 2 is located, so as to assist in quick freezing of food.

[0049] Furthermore, if Figure 6 As shown, in order to effectively expand the radiation range of the permanent magnetic field, the middle part of the permanent magnet can be arranged in this embodiment to be horizontally opposite to one side along the width direction of the continuous conveying device 2, with one pole of the permanent magnet located on the upper side of the continuous conveying device 2 and the other pole located on the lower side of the continuous conveying device 2.

[0050] Based on the further improvement of the above embodiment, in order to effectively expand the radiation range of the permanent magnetic field, the present embodiment can further set the cross-section of the permanent magnet to be arc-shaped and arranged symmetrically on both sides along the width direction of the continuous conveying device 2.

[0051] like Figure 7As shown, in one specific embodiment, the middle of the permanent magnet can be horizontally opposite to one side along the width direction of the continuous conveying device 2, one magnetic pole of the permanent magnet extends to the upper side of the continuous conveying device 2 and tilts toward the inner side thereof, and the other magnetic pole extends to the lower side of the continuous conveying device 2 and tilts toward the inner side thereof. It should be pointed out here that the tilting toward the inner side thereof can be specifically indicated as tilting toward the axial symmetry plane of the continuous conveying device 2 along the length direction.

[0052] In another specific embodiment, Figure 8 As shown, one magnetic pole of the permanent magnet can be horizontally opposite to one side along the width direction of the continuous conveying device 2, and the other magnetic pole of the permanent magnet can be extended to the lower side of the continuous conveying device 2 and tilted toward the inner side thereof. Fig. 9 As shown, when one pole of the permanent magnet is horizontally opposite to one side along the width direction of the continuous conveying device 2, the other pole of the permanent magnet can also be extended to the upper side of the continuous conveying device 2 and tilted toward the inside thereof.

[0053] In another specific embodiment, based on Figure 6 Further improvements to the scheme shown, such as Fig.10 As shown, the permanent magnets corresponding to the second permanent magnet array 4 can be arranged on the conveying mechanism of the continuous conveying device 2 and arranged along the length direction of the continuous conveying device 2, and the second permanent magnet array 4 corresponds to the first permanent magnet array 3. In this way, when the continuous conveying device 2 starts the conveying operation of the food, the second permanent magnet array 4 will move with the conveying mechanism of the continuous conveying device 2, and the corresponding permanent magnets of the second permanent magnet array 4 will interact with the permanent magnets of the first permanent magnet array 3 during the movement, so that the food is placed in a changing magnetic field environment during the conveying process, so that the quick-freezing quality of the food can be better improved and the quick-freezing requirements for different foods can be met.

[0054] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A quick freezer based on permanent magnetic field assisted freezing, characterized in that: include: A quick-freezing storehouse, wherein the quick-freezing storehouse has a quick-freezing mechanism for quick-freezing food; A permanent magnet generating device, the permanent magnet generating device is used to generate a constant or variable permanent magnetic field, the permanent magnetic field is used to be distributed on the food, and is used to be relatively stationary or relatively moving with the food; It also includes: a continuous conveying device, which is a belt conveyor, one end of which is located at the food entrance of the quick-freezing storehouse, and the other end is located at the food exit of the quick-freezing storehouse; the permanent magnet generating device is arranged beside the continuous conveying device and on the conveying mechanism of the continuous conveying device; The permanent magnet generating device comprises a first permanent magnet array and a second permanent magnet array, wherein the first permanent magnet array is arranged beside the continuous conveying device and arranged along the length direction of the continuous conveying device; the second permanent magnet array is arranged on the conveying mechanism of the continuous conveying device and arranged along the length direction of the continuous conveying device, and the second permanent magnet array corresponds to the first permanent magnet array; The first permanent magnet array includes two groups, which are relatively arranged on both sides along the width direction of the continuous conveying device. The first permanent magnet array includes a plurality of permanent magnets; the permanent magnets are arranged in sequence with the same magnetic pole orientation, or are arranged alternately in sequence with opposite magnetic pole orientations; the magnetic pole orientations of the permanent magnets correspondingly arranged in the width direction of the continuous conveying device are the same or opposite; The corresponding permanent magnets of the second permanent magnet array will interact with the permanent magnets of the first permanent magnet array during movement, so that the food is placed in a changing magnetic field environment during transportation, thereby improving the quick-freezing quality of the food.

2. The quick freezer based on permanent magnetic field assisted freezing according to claim 1, characterized in that: The belt conveyor is communicatively connected to a speed regulating device, and the speed regulating device is used to adjust the conveying speed of the conveying belt on the belt conveyor.

3. The quick freezer based on permanent magnetic field assisted freezing according to claim 1, characterized in that: The cross section of the permanent magnet is in a straight line shape, and the permanent magnet is vertically arranged at one side along the width direction of the continuous conveying device.

4. The quick freezer based on permanent magnetic field assisted freezing according to claim 3, characterized in that: The middle part of the permanent magnet is horizontally opposite to one side along the width direction of the continuous conveying device, one pole of the permanent magnet is located on the upper side of the continuous conveying device, and the other pole is located on the lower side of the continuous conveying device.

5. The quick freezer based on permanent magnetic field assisted freezing according to claim 1, characterized in that: The cross section of the permanent magnet is in an arc shape; One magnetic pole of the permanent magnet is horizontally opposite to one side along the width direction of the continuous conveying device, and the other magnetic pole extends to the upper side of the continuous conveying device and is inclined toward the inner side thereof, or the other magnetic pole of the permanent magnet extends to the lower side of the continuous conveying device and is inclined toward the inner side thereof; Alternatively, the middle part of the permanent magnet is horizontally opposite to one side along the width direction of the continuous conveying device, one pole of the permanent magnet extends toward the upper side of the continuous conveying device and tilts toward its inner side, and the other pole extends toward the lower side of the continuous conveying device and tilts toward its inner side.

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