Magnetic field control device, control system and control method based on fruit and vegetable preservation

Abstract

The invention relates to the technical field of fruit and vegetable preservation, and discloses a fruit and vegetable preservation-based magnetic field control device, control system and control method.The fruit and vegetable preservation-based magnetic field control device comprises a preservation box, uniform magnetic field generators and focusing magnetic field generators, the focusing magnetic field generators are arranged in the preservation box, the number of the focusing magnetic field generators is multiple, and the uniform magnetic field generators are arranged in the preservation box; the air inlet is adaptively mounted at the top end in the preservation box; and the magnetic field environment in the food can be more accurately controlled by combining a uniform magnetic field and a focused magnetic field. By means of the method, personalized magnetic field control can be achieved according to the specific state and position requirements of food, and the preservation effect is improved. The precision and personalized control capability is not possessed by a traditional method, so that a brand new possibility is brought to the development of a food fresh-keeping technology.

Description

Technical Field

[0001] The present invention relates to the technical field of fruit and vegetable preservation, and in particular to a magnetic field control device, a control system and a control method based on fruit and vegetable preservation. Background Art

[0002] At present, food preservation technology mainly relies on temperature regulation, humidity control and gas composition adjustment, but these traditional preservation methods often face the challenges of limited preservation effect and high energy consumption. In this context, magnetic field preservation technology has received increasing attention due to its potential capabilities. The application of magnetic fields can act on the internal molecular structure and biological activity of food, helping to prolong the freshness of food. Despite this, the existing magnetic field preservation technology still has shortcomings in accuracy and effect. For example, it is difficult to achieve precise point-to-point magnetic field treatment of food, resulting in unsatisfactory preservation effect. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention is proposed.

[0004] Therefore, the object of the present invention is to provide a magnetic field control device based on fruit and vegetable preservation.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a magnetic field control device based on fruit and vegetable preservation, comprising a fresh-keeping box, a uniform magnetic field generator and a focused magnetic field generator;

[0006] Wherein, the focusing magnetic field generator is arranged inside the fresh-keeping box, and the focusing magnetic field generator is arranged in multiple groups and is adapted to be installed at the inner top of the fresh-keeping box.

[0007] As a preferred solution of the magnetic field control device based on fruit and vegetable preservation of the present invention, wherein: the uniform magnetic field generator is composed of a long enameled copper wire winding and a steel plate, the steel plate is arranged in two groups, and the two groups of steel plates are respectively arranged at both ends of the long enameled copper wire winding;

[0008] The long enameled copper wire winding is composed of enameled copper wire wound around a long cylindrical iron core.

[0009] As a preferred solution of the magnetic field control device based on fruit and vegetable preservation described in the present invention, the diameter of the long cylindrical iron core of the long enameled copper wire winding is 30 mm and the length is 150 mm, the length of the steel plate is 500 mm and the width is 200 mm, the diameter of the enameled copper wire of the long enameled copper wire winding is 1 mm, and the number of outer turns of the enameled copper wire wound on the long enameled copper wire winding is 500.

[0010] As a preferred solution of the magnetic field control device based on fruit and vegetable preservation of the present invention, wherein: the focusing magnetic field generator is composed of ten groups of short enameled copper wire windings, and the short enameled copper wire windings are composed of enameled copper wires wound around a short cylindrical iron core;

[0011] Among them, ten groups of focusing magnetic field generators are evenly arranged at the top of the interior of the fresh-keeping box in the form of 2 rows and 5 columns.

[0012] As a preferred solution of the magnetic field control device based on fruit and vegetable preservation according to the present invention, the short cylindrical core of the short enameled copper wire winding has a diameter of 45 mm and a length of 100 mm, the diameter of the enameled copper wire of the short enameled copper wire winding is 1 mm, and the number of outer turns of the enameled copper wire wound on the short enameled copper wire winding is 600.

[0013] The present invention also provides a magnetic field control system based on fruit and vegetable preservation.

[0014] As a preferred solution of the magnetic field control system based on fruit and vegetable preservation of the present invention, wherein: a magnetic field control system based on fruit and vegetable preservation, comprising the magnetic field control device based on fruit and vegetable preservation, as well as a monitoring module and an image recognition module;

[0015] The monitoring module is used to monitor the various values ​​of fruits and vegetables in the fresh-keeping box and transmit the values ​​to the PLC host computer;

[0016] The image recognition module is used to identify the type and status of fruits and vegetables and transmit them to the PLC host computer.

[0017] As a preferred solution of the magnetic field control system based on fruit and vegetable preservation of the present invention, the monitoring module includes a position sensor and a weight sensor.

[0018] The position sensor is used to detect the specific position of the fruits and vegetables inside the fresh-keeping box;

[0019] The weight sensor is used to detect the gravity change of the fruits and vegetables inside the fresh-keeping box.

[0020] The present invention also provides a magnetic field control method based on fruit and vegetable preservation.

[0021] As a preferred solution of the magnetic field control method based on fruit and vegetable preservation of the present invention, a magnetic field control method based on fruit and vegetable preservation includes the magnetic field control system based on fruit and vegetable preservation, and the specific steps are as follows:

[0022] The type of fruits and vegetables is identified through the image recognition module, and their status is monitored through the monitoring module;

[0023] Automatically match the most suitable magnetic field strength and distribution parameters according to the location and type of fruits and vegetables to meet the current needs of fruit and vegetable preservation;

[0024] After the matching is completed, the PLC host computer will automatically adjust the working parameters of the uniform magnetic field generator and the focused magnetic field generator to ensure that the magnetic field meets the optimal magnetic field strength and distribution requirements;

[0025] The preservation effect of fruits and vegetables is continuously monitored, and the monitoring results are fed back to the PLC host computer. The PLC host computer adjusts the working parameters of the focusing magnetic field generator based on the feedback data.

[0026] As a preferred solution of the magnetic field control method for fruit and vegetable preservation according to the present invention, the magnetic field strength calculation formula of the uniform magnetic field generator is as follows:

[0027]

[0028] W is the uniform magnetic field value; A is the most suitable uniform magnetic field strength detected for the corresponding fruits and vegetables; n is the number of types of fruits and vegetables stored.

[0029] As a preferred solution of the magnetic field control method for fruit and vegetable preservation according to the present invention, the initial magnetic field strength calculation formula of the focusing magnetic field generator is as follows:

[0030] X1=|X1-W|

[0031] X2=|X2-W|

[0032]

[0033] X n =|X n -W|

[0034] X is the initial value of the focusing magnetic field;

[0035] The calculation formula for adjusting the magnetic field strength of the focal magnetic field generator is as follows:

[0036] X1′=X1*(1+p1+q1)

[0037] X2′=X2*(1+p2+q2)

[0038]

[0039] X n ' n =X n *(1+p n +q n )

[0040] p is the decay rate of fruits and vegetables, q is the weight loss rate of fruits and vegetables, and if the degree of brown spots exceeds 15% of the total area of ​​fruits and vegetables, the fruits and vegetables are marked as rotten.

[0041] Beneficial effects of the present invention: Traditional magnetic field preservation methods are mainly based on magnetization treatment or simple magnetic field application, but their application in food preservation is relatively limited. Traditional magnetic field treatment is usually based on a static magnetic field, which is difficult to achieve precise control for different types of food and cannot meet the personalized needs of food preservation.

[0042] In contrast, the method of combining uniform magnetic field and focused magnetic field can more accurately control the magnetic field environment inside the food. In this way, personalized magnetic field control can be achieved according to the specific state and location requirements of the food, thereby improving the preservation effect. This kind of precision and personalized control capability is not available in traditional methods, thus bringing new possibilities for the development of food preservation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0044] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0045] Figure 2 It is a schematic structural diagram of the uniform magnetic field generator of the present invention.

[0046] Figure 3 It is a schematic diagram of the structure of the focusing magnetic field generator of the present invention. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0050] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0051] Example 1

[0052] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, provides a magnetic field control device based on fruit and vegetable preservation, the device includes a fresh-keeping box 100, a uniform magnetic field generator 200 and a focusing magnetic field generator 300;

[0053] The focusing magnetic field generator 300 is arranged inside the fresh-keeping box 100 . The focusing magnetic field generator 300 is arranged in multiple groups and is adapted to be installed at the top of the interior of the fresh-keeping box 100 .

[0054] Specifically, the uniform magnetic field generator 200 is composed of a long enameled copper wire winding 201 and a steel plate 202. The steel plate 202 is provided in two groups, and the two groups of steel plates 202 are respectively provided at both ends of the long enameled copper wire winding 201;

[0055] The long enameled copper wire winding 201 is composed of enameled copper wire wound around a long cylindrical iron core.

[0056] Furthermore, the diameter of the long cylindrical core of the long enameled copper wire winding 201 is 30 mm and the length is 150 mm, the length of the steel plate 202 is 500 mm and the width is 200 mm, the diameter of the enameled copper wire of the long enameled copper wire winding 201 is 1 mm, and the number of turns on the outside of the enameled copper wire wound on the long enameled copper wire winding 201 is 500.

[0057] Furthermore, the focusing magnetic field generator 300 is composed of ten groups of short enameled copper wire windings 301, and the short enameled copper wire windings 301 are composed of enameled copper wires wound around a short cylindrical iron core;

[0058] Among them, ten groups of focusing magnetic field generators 300 are evenly arranged at the top of the fresh-keeping box 100 in the form of 2 rows and 5 columns.

[0059] Preferably, the short cylindrical core of the short enameled copper wire winding 301 has a diameter of 45 mm and a length of 100 mm, the diameter of the enameled copper wire of the short enameled copper wire winding 301 is 1 mm, and the number of turns wound on the outside of the enameled copper wire of the short enameled copper wire winding 301 is 600.

[0060] By placing fruits and vegetables inside the fresh-keeping box 100 and energizing the long enameled copper wire winding 201, a uniform magnetic field region can be formed inside the fresh-keeping box 100 in conjunction with the two sets of steel plates 202, thereby achieving a fresh-keeping effect on fruits and vegetables.

[0061] After the short enameled copper wire winding 301 is energized, a magnetic field can be formed in the focused magnetic field generator 300. In this way, while the fruits and vegetables are preserved by a uniform magnetic field, different magnetic field preservation can be performed on the fruits and vegetables in a specific area by a concentrated magnetic field, further improving the preservation effect of the fruits and vegetables.

[0062] Example 2

[0063] Reference Figure 1 to Figure 3 , which is the second embodiment of the present invention, and this embodiment is different from the first embodiment in that: a magnetic field control system based on fruit and vegetable preservation, comprising the magnetic field control device based on fruit and vegetable preservation, as well as a monitoring module and an image recognition module;

[0064] The monitoring module is used to monitor the various values ​​of fruits and vegetables in the fresh-keeping box and transmit the values ​​to the PLC host computer;

[0065] The image recognition module is used to identify the type and status of fruits and vegetables and transmit them to the PLC host computer.

[0066] Furthermore, the monitoring module includes a position sensor and a weight sensor.

[0067] The position sensor is used to detect the specific position of the fruits and vegetables inside the fresh-keeping box;

[0068] The weight sensor is used to detect the gravity change of the fruits and vegetables inside the fresh-keeping box.

[0069] In summary, the PLC host computer first detects various fruits and vegetables placed in the equipment through the monitoring module and the image recognition module to obtain their types and characteristics. Based on these data, the PLC host computer calculates and applies the initial magnetic field according to the preset uniform magnetic field and the focused magnetic field formula. This step is to provide a basic magnetic field for the subsequent preservation process according to the type and characteristics of fruits and vegetables. Subsequently, the PLC host computer enters the automatic control stage. In this stage, the PLC host computer controls the monitoring module and the image recognition module to monitor the weight loss rate and decay rate of fruits and vegetables every day. These data are transmitted to the PLC host computer as feedback information. Based on the real-time data provided by the monitoring module, the PLC host computer gradually adjusts the magnetic field to the corresponding intensity through the calculation formula to achieve precise control of the fruit and vegetable preservation process. It can be dynamically adjusted according to the real-time status of fruits and vegetables to ensure that the magnetic field is always in the most suitable state for fruit and vegetable preservation.

[0070] Example 3

[0071] Reference Figure 1 to Figure 3 , which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: a magnetic field control method based on fruit and vegetable preservation, including the magnetic field control system based on fruit and vegetable preservation, and the specific steps are as follows,

[0072] The type of fruits and vegetables is identified through the image recognition module, and their status is monitored through the monitoring module;

[0073] Automatically match the most suitable magnetic field strength and distribution parameters according to the location and type of fruits and vegetables to meet the current needs of fruit and vegetable preservation;

[0074] After the matching is completed, the PLC host computer will automatically adjust the working parameters of the uniform magnetic field generator and the focused magnetic field generator to ensure that the magnetic field meets the optimal magnetic field strength and distribution requirements;

[0075] The preservation effect of fruits and vegetables is continuously monitored, and the monitoring results are fed back to the PLC host computer. The PLC host computer adjusts the working parameters of the focusing magnetic field generator based on the feedback data.

[0076] Furthermore, the calculation formula of the magnetic field strength of the uniform magnetic field generator is as follows:

[0077]

[0078] W is the uniform magnetic field value; A is the most suitable uniform magnetic field strength detected for the corresponding fruits and vegetables; n is the number of types of fruits and vegetables stored.

[0079] By taking the average value of the magnetic field strength suitable for all fruits and vegetables as the initial uniform magnetic field strength, the needs of different types of fruits and vegetables for the magnetic field can be comprehensively considered to ensure that the magnetic field can adapt to the preservation needs of multiple fruits and vegetables at the same time. Doing so helps to average the magnetic field effect within the device so that all fruits and vegetables can be affected by similar magnetic fields, thereby achieving more consistent performance in terms of preservation effects. In addition, using the average value as the initial value may also simplify the adjustment process of the device, reduce the need for complex adjustments to the specific magnetic field requirements of different types of fruits and vegetables, and improve the practicality and versatility of the device. Ultimately, this method helps ensure that different fruits and vegetables can obtain similar preservation effects under the same magnetic field environment, improving the consistency and stability of fruit and vegetable preservation.

[0080] Furthermore, the calculation formula for the initial magnetic field strength of the focusing magnetic field generator is as follows,

[0081] X1=|X1-W|

[0082] X2=|X2-W|

[0083]

[0084] X n =|X n -W|

[0085] X is the initial value of the focusing magnetic field.

[0086] By subtracting the uniform magnetic field strength from the most suitable magnetic field strength for the fruit and vegetables, it is possible to achieve classified focusing on different fruits and vegetables. This personalized adjustment can more accurately meet the preservation needs of each fruit and vegetable, extend the preservation time and maintain the quality of fruits and vegetables. By classifying and focusing on different fruits and vegetables, the device can more effectively utilize magnetic field resources and avoid applying the same magnetic field strength to all fruits and vegetables, thereby improving resource utilization efficiency. At the same time, this flexibility helps the device to more accurately adjust the magnetic field strength during the processing of different fruits and vegetables to achieve the best preservation effect. In summary, the application of the focused magnetic field calculation formula can achieve personalized preservation treatment of different fruits and vegetables, improve the preservation effect, improve resource utilization efficiency, and increase the flexibility of the system.

[0087] The calculation formula for adjusting the magnetic field strength of the focal magnetic field generator is as follows:

[0088] X1′=X1*(1+p1+q1)

[0089] X2′=X2*(1+p2+q2)

[0090]

[0091] X n ' n =Xn *(1+p n +q n )

[0092] p is the decay rate of fruits and vegetables, q is the weight loss rate of fruits and vegetables, and if the degree of brown spots exceeds 15% of the total area of ​​fruits and vegetables, the fruits and vegetables are marked as rotten.

[0093] In the feedback stage, the focused magnetic field is gradually increased in proportion to the measured decay rate p and weight loss rate q;

[0094] The decay rate p is obtained by uploading the image to the PLC host computer for processing and calculation after being photographed by the image recognition module, and the weight loss rate is obtained by uploading the data to the PLC host computer for processing and calculation after being monitored by the monitoring module.

[0095] The practice of gradually increasing the focused magnetic field is based on considerations for the protection of fruits and vegetables and the controllability of the experiment. First, gradually increasing the focused magnetic field allows fruits and vegetables to gradually adapt to the new magnetic field environment and reduce sudden impacts on fruits and vegetables. The sudden application of a high-intensity magnetic field may cause damage to fruits and vegetables, such as damage to cell structure or loss of nutrients. By gradually increasing the intensity of the magnetic field, potential damage to fruits and vegetables can be reduced, ensuring that fruits and vegetables maintain good edible quality. In addition, gradually increasing the focused magnetic field can also be adjusted more finely to maximize the shelf life of fruits and vegetables while adapting to them. This gradual adjustment can better meet the preservation needs of fruits and vegetables at different stages and improve the preservation effect.

[0096] In addition, gradually increasing the focused magnetic field can make the experiment more controllable. By observing the decay rate and weight loss rate at each stage, we can more clearly understand the response of fruits and vegetables to changes in the magnetic field, thereby better optimizing the preservation process. This method can reduce the maladaptive response of fruits and vegetables to changes in the magnetic field, helping to maintain the freshness and quality of fruits and vegetables. In contrast, adjusting to the maximum magnetic field at the beginning may cause fruits and vegetables to be over-exposed to strong magnetic fields, increasing the risk of damage to fruits and vegetables. It may also be difficult to accurately observe the response of fruits and vegetables to changes in the magnetic field, thus affecting the evaluation and optimization of the preservation effect.

[0097] The magnetic field table of fruits and vegetables is as follows:

[0098]

[0099] In order to explain the embodiments of the present invention in detail, the following takes strawberries as an example to further describe the specific application of the magnetic field control device in the preservation process as follows:

[0100] Select a number of fresh strawberries with no surface damage, an average weight of about 25g, and a freshness of about 90%. Divide them into two even groups for a refrigerated preservation control test. Place the patented device in a low-temperature test box with a refrigeration temperature of 5°C, and evenly place the strawberries in this test box to form an experimental group; another group of strawberries is directly and evenly placed in a low-temperature test box with a refrigeration temperature of 5°C to form a control group. Data collection and calibration are carried out according to daily conditions, and the degree of brown spots on the surface exceeding 15% of the total area of ​​the strawberries is recorded as rotten strawberries. The rot rate p is the number of rotten strawberries divided by the total number of strawberries in the experimental group. The weight loss rate q is measured by a weighing instrument and calculated.

[0101]

[0102]

[0103] The above experimental data show that the decay rate of strawberries is significantly reduced within 18 days, and the preservation effect is better, which is approximately 12%.

[0104] The decay rate and weight loss rate are the basis for adjusting the focused magnetic field, mainly because these two factors directly affect the freshness and edible quality of fruits and vegetables. Therefore, using them as the basis for adjusting the magnetic field can more directly respond to changes in the fruit and vegetable preservation process. The decay rate reflects the degree of decay of fruits and vegetables, while the weight loss rate represents the loss of water in fruits and vegetables. These factors are directly related to the preservation status of fruits and vegetables. In addition, the decay rate and weight loss rate can usually be obtained through simple measurement and observation. The decay rate can be estimated by observing the degree of decay on the surface of fruits and vegetables, while the weight loss rate can be calculated by weighing the weight lost by fruits and vegetables during the preservation process. The measurement and monitoring of the decay rate and weight loss rate are usually simpler and more intuitive, suitable for real-time monitoring and adjustment in practical applications.

[0105] In summary, traditional magnetic field preservation methods are mainly based on magnetization treatment or simple magnetic field application, but their application in food preservation is relatively limited. Traditional magnetic field treatment is usually based on static magnetic field, which is difficult to achieve precise control for different types of food, and cannot meet the personalized needs of food preservation.

[0106] In contrast, the method of combining uniform magnetic field and focused magnetic field can more accurately control the magnetic field environment inside the food. In this way, personalized magnetic field control can be achieved according to the specific state and location requirements of the food, thereby improving the preservation effect. This kind of precision and personalized control capability is not available in traditional methods, thus bringing new possibilities for the development of food preservation technology.

Claims

1. A magnetic field control device based on fruit and vegetable preservation, characterized in that: It comprises a fresh-keeping box (100), a uniform magnetic field generator (200) and a focused magnetic field generator (300); The focused magnetic field generator (300) is arranged inside the fresh-keeping box (100), and the focused magnetic field generator (300) is arranged in multiple groups and is adapted to be installed at the top of the interior of the fresh-keeping box (100).

2. The magnetic field control device for preserving fruits and vegetables according to claim 1, characterized in that: The uniform magnetic field generator (200) is composed of a long enameled copper wire winding (201) and a steel plate (202), wherein the steel plate (202) is provided in two groups, and the two groups of steel plates (202) are respectively provided at two ends of the long enameled copper wire winding (201); The long enameled copper wire winding (201) is composed of enameled copper wire wound around a long cylindrical iron core.

3. The magnetic field control device for preserving fruits and vegetables according to claim 2, characterized in that: The diameter of the long cylindrical iron core of the long enameled copper wire winding (201) is 30 mm and the length is 150 mm, the length of the steel plate (202) is 500 mm and the width is 200 mm, the diameter of the enameled copper wire of the long enameled copper wire winding (201) is 1 mm, and the number of turns of the enameled copper wire wound on the outside of the long enameled copper wire winding (201) is 500.

4. The magnetic field control device for preserving fruits and vegetables according to claim 2 or 3, characterized in that: The focusing magnetic field generator (300) is composed of ten groups of short enameled copper wire windings (301), wherein the short enameled copper wire windings (301) are composed of enameled copper wires wound around a short cylindrical iron core; Among them, ten groups of the focusing magnetic field generators (300) are evenly arranged at the top of the interior of the fresh-keeping box (100) in the form of 2 rows and 5 columns.

5. The magnetic field control device for preserving fruits and vegetables according to claim 4, characterized in that: The short cylindrical core of the short enameled copper wire winding (301) has a diameter of 45 mm and a length of 100 mm, the diameter of the enameled copper wire of the short enameled copper wire winding (301) is 1 mm, and the number of turns of the enameled copper wire wound on the outside of the short enameled copper wire winding (301) is 600.

6. A magnetic field control system based on fruit and vegetable preservation, characterized in that: It comprises the magnetic field control device for preserving fruits and vegetables as described in any one of claims 1 to 5, as well as a monitoring module and an image recognition module; The monitoring module is used to monitor the various values ​​of fruits and vegetables in the fresh-keeping box and transmit the values ​​to the PLC host computer; The image recognition module is used to identify the type and status of fruits and vegetables and transmit them to the PLC host computer.

7. The magnetic field control system based on fruit and vegetable preservation according to claim 6 is characterized in that: The monitoring module includes position sensor, weight sensor, The position sensor is used to detect the specific position of the fruits and vegetables inside the fresh-keeping box; The weight sensor is used to detect the gravity change of the fruits and vegetables inside the fresh-keeping box.

8. A magnetic field control method based on fruit and vegetable preservation, characterized in that: The method comprises the magnetic field control system based on fruit and vegetable preservation as described in claim 6 or 7, and the specific steps are as follows: The type of fruits and vegetables is identified through the image recognition module, and their status is monitored through the monitoring module; Automatically match the most suitable magnetic field strength and distribution parameters according to the location and type of fruits and vegetables to meet the current needs of fruit and vegetable preservation; After the matching is completed, the PLC host computer will automatically adjust the working parameters of the uniform magnetic field generator and the focused magnetic field generator to ensure that the magnetic field meets the optimal magnetic field strength and distribution requirements; The preservation effect of fruits and vegetables is continuously monitored, and the monitoring results are fed back to the PLC host computer. The PLC host computer adjusts the working parameters of the focusing magnetic field generator based on the feedback data.

9. The magnetic field control method for preserving fruits and vegetables according to claim 8, characterized in that: The calculation formula of the magnetic field strength of the uniform magnetic field generator is as follows: W is the uniform magnetic field value; A is the most suitable uniform magnetic field strength detected for the corresponding fruits and vegetables; n is the number of types of fruits and vegetables stored.

10. The magnetic field control method for preserving fruits and vegetables according to claim 9, characterized in that: The calculation formula of the initial magnetic field strength of the focusing magnetic field generator is as follows: X is the initial value of the focusing magnetic field; The calculation formula for adjusting the magnetic field strength of the focal magnetic field generator is as follows: p is the decay rate of fruits and vegetables, q is the weight loss rate of fruits and vegetables, and if the degree of brown spots exceeds 15% of the total area of ​​fruits and vegetables, the fruits and vegetables are marked as rotten.

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