Storage device and storage method for grains to prevent mildew and insects

Abstract

The present invention discloses a storage device and a storage method for grains that are mildew-proof and insect-proof. The storage method comprises: applying a magnetic field in the storage environment of the grains, the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2-0.5 mT / s, and the falling edge is 0.2-0.5 mT / s. The storage method for grains that are mildew-proof and insect-proof provided by the present invention inhibits the physiological metabolic activity of microorganisms and insect eggs through the biological effect of the magnetic field, and the operation is safer and will not cause pollution to the grains. The storage method for grains that are mildew-proof and insect-proof provided by the present invention inhibits the germination of mold spores through a sawtooth magnetic field, and at the same time, deforms the insect eggs, thereby inhibiting the physiological metabolic activity of microorganisms and insect eggs, thereby avoiding grain mold and improving the storage quality of grains.

Description

Technical Field

[0001] The invention particularly relates to a mildew-proof and insect-proof grain storage device and storage method, belonging to the technical field of agricultural product storage. Background Art

[0002] With the development of my country's agriculture, people's requirements for the quality and safety of grain food are increasing day by day. However, the microorganisms, pathogens and biological toxins produced by grain mold and insects seriously affect human health. Many pests exist in the field when grains grow, after harvesting or during processing. For example, rice weevils parasitize rice. When the moisture content in rice grains is high or the air is humid, their reproduction intensifies, eroding the rice grains and causing grain mold and deterioration. In particular, aflatoxin in grains is extremely harmful to the human body.

[0003] At present, the methods for preventing insects and mildew of grains are mainly chemical and physical methods. Grains are chemically treated with protective agents such as phosphine, sulfur dioxide fumigation or methyl pyriphos, but chemical agents have good control effects on adult insects, poor control effects on insect eggs and molds, and are prone to causing problems such as residual agents and increased resistance of insect pests, and cannot be used in the home. Common physical methods include high-temperature insecticides, ultraviolet light, ionizing radiation, microwave insecticides, etc. For example, CN103828914B uses pulse microwaves to dry grains to achieve mildew and insect prevention, but microwaves can easily cause local temperatures on the inner surface to be too high, affecting nutrients such as protein and vitamins in grains, causing grain quality to decline. For example, CN206776650U uses ultraviolet rays to sterilize peanuts to achieve mildew prevention, but ultraviolet rays only act on the surface of the sample and cannot effectively kill mold and insects deep inside the grain pile. Improper use of ultraviolet intensity can easily cause microbial and other flora mutations, resulting in adverse effects and certain safety hazards.

[0004] Magnetic fields have the characteristics of strong penetration, safety and pollution-free. They can inhibit the physiological metabolic activity of microorganisms and insect eggs through the biological effects of magnetic fields. They have great application potential in grain mildew and insect prevention. However, existing magnetic field treatment methods usually require the application of higher magnetic field intensity, consume more energy, and are not suitable for modular assembly. Summary of the invention

[0005] The main purpose of the present invention is to provide a storage device and a storage method for grains that are mildew-proof and insect-proof, thereby overcoming the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0007] The present invention provides a method for storing grains to prevent mildew and insects, comprising: applying a magnetic field in a storage environment of the grains, wherein the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2-0.5 mT / s, and the falling edge is 0.2-0.5 mT / s, and adjusting at least one of the magnetic field intensity and the magnetic field period of the magnetic field so that the magnetic field uniformity in the storage space is higher than 50%.

[0008] The present invention also provides a grain mildew and insect-proof storage device, comprising:

[0009] a storage unit including a storage space for accommodating grain;

[0010] A magnetic field generating unit, which is at least used to apply a magnetic field in the storage space, wherein the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2-0.5 mT / s, the falling edge is 0.2-0.5 mT / s, the magnetic field intensity of the magnetic field is 5.5-7.0 mT, and the period of the magnetic field is 22-70 s;

[0011] a temperature regulating unit, which is at least used to regulate the temperature in the storage space;

[0012] The humidity adjustment unit is at least used for adjusting the humidity in the storage space.

[0013] Compared with the prior art, the present invention provides a method for storing grains to prevent mildew and insects, which inhibits the germination of mold spores through a sawtooth magnetic field, and at the same time, deforms insect eggs, thereby inhibiting the physiological metabolic activity of microorganisms and insect eggs, thereby avoiding grain mold and improving the storage quality of grains. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a magnetic field generating unit in a grain mildew and insect-proof storage device provided in Example 1 of the present invention;

[0015] Figure 2 is a magnetic field waveform diagram used in Example 2 of the present invention;

[0016] Figure 3 is a magnetic field distribution diagram in a constant temperature and humidity chamber in Example 2 of the present invention;

[0017] Figure 4 is a magnetic field waveform diagram used in Example 3 of the present invention;

[0018] Figure 5 is a magnetic field waveform diagram used in Example 4 of the present invention;

[0019] Figure 6 This is the magnetic field waveform diagram used in Example 5 of the present invention. DETAILED DESCRIPTION

[0020] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0021] The mildew prevention referred to in the present invention refers to inhibiting the germination and growth of spores of molds such as Penicillium, Mucor, Aspergillus and Rhizopus on the surface of grains, and the insect prevention referred to refers to inhibiting the growth of eggs or larvae of mealworms, rice planthoppers, rice weevils, wheat moths, etc. in grains.

[0022] The present invention utilizes a magnetic field with a specific waveform to control the metabolic channel switch of mold and restrain its growth, and periodically applies a magnetic field to orient anti-magnetic molecules including water molecules and organic macromolecules, thereby achieving the mildew and insect prevention function of grains under exposure to a magnetic field. Specifically, the rising and falling edges of the magnetic field with a specific waveform of the present invention induce an ion "surge" in the mold cells to interfere with the formation of a membrane structure, and make the effective magnetic flux absorbed by the mold and insects greater than the induced magnetic field generated by the ion current of the cell's own metabolism, thereby inhibiting the germination of mold spores, deforming insect eggs, and inhibiting the physiological metabolic activity of microorganisms and insect eggs, thereby avoiding grain mold and improving the storage quality of grain.

[0023] The present invention provides a method for storing grains to prevent mildew and insects, comprising: applying a magnetic field in a storage environment of the grains, wherein the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2-0.5 mT / s, and the falling edge is 0.2-0.5 mT / s, and adjusting at least one of the magnetic field intensity and the magnetic field period of the magnetic field so that the magnetic field uniformity in the storage space is higher than 50%.

[0024] Furthermore, the magnetic field strength of the magnetic field is 5.5-7.0 mT.

[0025] Furthermore, the period of the magnetic field is 22-70s.

[0026] Furthermore, the storage method specifically includes: applying the magnetic field from one side of the storage space using a magnetic field generating unit.

[0027] Furthermore, the magnetic field generating unit includes a coil frame and an excitation coil, the surface of the coil frame has a first area and a second area surrounding the first area, the first area is provided with a through hole, the excitation coil is arranged in the second area and distributed around the through hole, wherein the ratio of the area of ​​the through hole to the area of ​​the second area of ​​the coil frame covered by the excitation coil is 1:23-1:30.

[0028] Furthermore, the coil skeleton is parallel to the radial section of the storage space, and the outer contour shape of the coil skeleton and the area of ​​the region enclosed by the outer contour are the same as the contour and area of ​​the radial section of the storage space, or, the coil skeleton is parallel to the axial section of the storage space, and the outer contour shape of the coil skeleton and the area of ​​the region enclosed by the outer contour are the same as the contour and area of ​​the axial section of the storage space.

[0029] Furthermore, the magnetic field generating unit also includes a circuit control module, and the storage method also includes: adjusting at least one of the magnetic field strength and magnetic field period of the magnetic field by the circuit control module to maintain the magnetic field uniformity in the storage space at 55-85%.

[0030] Furthermore, the storage method includes: maintaining the uniformity of the magnetic field in a space 5 cm away from the magnetic field generating unit at 55-85%.

[0031] Furthermore, the storage method further comprises: maintaining the temperature in the storage environment at 8-30° C. and the humidity at 50-85%.

[0032] Furthermore, the cereals include at least one of peanuts, soybeans, rice, oats, and corn, or a combination of two or more thereof.

[0033] The present invention also provides a grain mildew and insect-proof storage device, comprising:

[0034] a storage unit including a storage space for accommodating grain;

[0035] A magnetic field generating unit, which is at least used to apply a magnetic field in the storage space, wherein the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2-0.5 mT / s, the falling edge is 0.2-0.5 mT / s, the magnetic field intensity of the magnetic field is 5.5-7.0 mT, and the period of the magnetic field is 22-70 s;

[0036] a temperature regulating unit, which is at least used to regulate the temperature in the storage space;

[0037] The humidity adjustment unit is at least used for adjusting the humidity in the storage space.

[0038] Furthermore, the magnetic field generating unit is arranged on one side of the storage space.

[0039] Furthermore, the magnetic field generating unit includes a coil frame and an excitation coil, the surface of the coil frame has a first area and a second area surrounding the first area, the first area is provided with a through hole, the excitation coil is arranged in the second area and distributed around the through hole, wherein the ratio of the area of ​​the through hole to the area of ​​the second area of ​​the coil frame covered by the excitation coil is 1:23-1:30.

[0040] Furthermore, the coil skeleton is parallel to the radial section of the storage space, and the outer contour shape of the coil skeleton and the area of ​​the region enclosed by the outer contour are the same as the contour and area of ​​the radial section of the storage space, or, the coil skeleton is parallel to the axial section of the storage space, and the outer contour shape of the coil skeleton and the area of ​​the region enclosed by the outer contour are the same as the contour and area of ​​the axial section of the storage space.

[0041] Furthermore, the magnetic field generating device comprises a single excitation coil wound on a coil frame, the wire diameter of the excitation coil is 0.2 to 2.5 mm, and the number of turns of the excitation coil is 500 to 2000 turns.

[0042] The technical solution, its implementation process and principle, etc. will be further explained in conjunction with the accompanying drawings and specific implementation cases as follows. However, it should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described in the following (embodiments) can be combined with each other to form a new or preferred technical solution. Due to space limitations, they will not be described one by one here. In addition, unless otherwise specified, the temperature sensor, temperature adjustment mechanism, humidity sensor, humidity adjustment function mechanism, controller, etc. used in the present invention are all known to those skilled in the art, and they can all be purchased commercially, and their specific structures and models are not limited and described here.

[0043] Example 1

[0044] A grain mildew and insect-proof storage device comprises a storage unit, a magnetic field generating unit, a temperature regulating unit, a humidity regulating unit and a control unit. The control unit is respectively connected to the magnetic field generating unit, the temperature regulating unit and the humidity regulating unit, and is used to adjust the working states and parameters of the magnetic field generating unit, the temperature regulating unit and the humidity regulating unit.

[0045] Specifically, the storage unit includes a storage space for accommodating grains. Exemplarily, the storage unit may be a container such as a fixed storage room or a movable storage box.

[0046] Specifically, the magnetic field generating unit is mainly used to apply a magnetic field in the storage space to inhibit the germination of mold spores under a specified temperature and humidity environment, and at the same time, to cause the insect eggs in the grains to develop deformed, ultimately achieving the purpose of preventing insects and mold from growing during grain storage.

[0047] Specifically, the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2-0.5mT / s, and the falling edge is 0.2-0.5mT / s. The magnetic field strength of the coil skeleton is 5.5-7.0mT, and the period of the magnetic field is 22-70s.

[0048] Specifically, the magnetic field generating unit is arranged on one side of the storage space, see Figure 1 The magnetic field generating unit includes an excitation coil 1, a coil frame 2, a power supply and a circuit control module 3. The excitation coil 1 is wound on the coil frame 2, and the excitation coil 1 is also electrically connected to the power supply, and the power supply is also connected to the circuit control module 3, and the circuit control module 3 is also connected to the control unit. The working parameters of the power supply are adjusted by the control unit and the circuit control module 3, so as to adjust at least one of the magnetic field strength and the magnetic field period of the magnetic field, so that the magnetic field generating unit can generate the magnetic field and keep the uniformity of the magnetic field in the storage space at 55-85%.

[0049] Specifically, the surface of the coil skeleton 2 has a first area and a second area surrounding the first area, the first area is provided with a through hole, the excitation coil is arranged in the second area and distributed around the through hole, wherein the ratio of the area of ​​the through hole to the area of ​​the second area of ​​the coil skeleton covered by the excitation coil is 1:23-1:30; the excitation coil 1 is a single excitation coil, the wire diameter of the excitation coil is 0.2~2.5mm, and the number of turns of the excitation coil is 500~2000 turns.

[0050] Specifically, the coil skeleton 2 is parallel to the radial section of the storage space, and the outer contour shape of the coil skeleton and the area of ​​the area enclosed by the outer contour are the same as the contour and area of ​​the radial section of the storage space, or, the coil skeleton 2 is parallel to the axial section of the storage space, and the outer contour shape of the coil skeleton and the area of ​​the area enclosed by the outer contour are the same as the contour and area of ​​the axial section of the storage space.

[0051] It should be noted that the control unit may be a controller including a numerical control program, and the circuit control module 3 may also be integrated in the control unit. Of course, the numerical control program and the corresponding circuit structure may be commercially available and are not specifically limited here.

[0052] Specifically, the material of the coil skeleton 2 can be polystyrene, epoxy resin, acrylic, plastic or synthetic wood board, etc., and the shape of the coil skeleton 2 can be square, rectangular, circular, triangular or parallelogram, etc.

[0053] Specifically, the temperature regulating unit is used to regulate the temperature in the storage space. More specifically, the temperature regulating unit includes a temperature sensor and a temperature regulating mechanism. The temperature sensor is arranged in the storage space and is used to monitor the temperature in the storage space. The temperature regulating mechanism is connected to the temperature sensor and can regulate the temperature of the storage space. Moreover, the temperature regulating mechanism and the temperature sensor are also connected to the control unit. More specifically, the temperature regulating mechanism may include a heating mechanism and a cooling mechanism. Exemplarily, the heating mechanism may include a resistance heater, and the cooling structure may be an air cooling mechanism or a water cooling mechanism, etc. Of course, the resistance heater and the air cooling mechanism or the water cooling mechanism may be commercially available, and their specific structures, models, etc. are limited here.

[0054] Specifically, the humidity regulating unit is mainly used to regulate the humidity in the storage space. Specifically, the humidity regulating unit includes a humidity sensor and a humidity regulating mechanism. The humidity sensor is arranged in the storage space and connected to the humidity regulating mechanism. The humidity regulating mechanism and the humidity sensor are both connected to the control unit. It should be noted that the humidity regulating mechanism and the humidity sensor can be purchased commercially, and their specific structures are not limited or described herein.

[0055] Example 2

[0056] A method for preventing corn from getting moldy is implemented based on a grain storage device for preventing mold and insects provided in Example 1. In this example, a square polystyrene coil skeleton and an excitation coil with a wire diameter of 0.8 mm are used. The number of winding turns of the excitation coil is 1500 turns. The ratio of the area of ​​the through hole on the coil skeleton to the area of ​​the coil skeleton covered by the excitation coil is 1:23. The method specifically includes:

[0057] (1) The corn kernels were sieved using a 5-mesh sieve, and moldy, sprouted, and worm-eaten particles were manually removed. According to the direct drying method in GB5009.3-2016, the moisture content of the corn kernels was determined to be 6.5%;

[0058] (2) Accurately weigh kg of corn kernels obtained in step (1) and place them in a clean, breathable fresh-keeping box;

[0059] (3) The inner cavity of the constant temperature and humidity chamber is sterilized by ultraviolet light for 30 minutes. The magnetic field generating unit is placed in the constant temperature and humidity chamber. The magnetic field strength in the constant temperature and humidity chamber is adjusted to 5.5 mT by the circuit control module. The period is 22 s. The magnetic field waveform is sawtooth-shaped. The rising edge of the waveform is 0.5 mT / s and the falling edge of the waveform is 0.5 mT / s. The waveform of the magnetic field is as follows: Figure 2 As shown, the magnetic field uniformity in the constant temperature and humidity chamber is maintained at 85%. The magnetic field distribution diagram in the constant temperature and humidity chamber is as shown Figure 3 As shown;

[0060] The air-permeable fresh-keeping box containing the corn kernels in step (2) is placed above the magnetic field generating unit in a constant temperature and humidity chamber, and the temperature in the constant temperature and humidity chamber is controlled to be 25° C. and the relative humidity is 75%, and the storage is carried out for a total of 20 days.

[0061] After storage, the growth of mycelium on the surface of the corn kernels was observed, and the aflatoxin B1 content was determined according to GB 5009.22~2016 "Determination of Aflatoxins B and G in Foods". The results showed that after 20 days of storage, no obvious mold mycelium was found on the surface of the corn kernels, and no aflatoxin B1 was detected.

[0062] Example 3

[0063] A method for preventing corn from mildew in this embodiment is basically the same as that in Embodiment 2. In this embodiment, the ratio of the area of ​​the through hole on the coil frame to the area of ​​the coil frame covered by the excitation coil is 1:30. The difference is that:

[0064] (3) The inner cavity of the constant temperature and humidity chamber is sterilized by ultraviolet light for 30 minutes. The magnetic field generating unit is placed in the constant temperature and humidity chamber. The magnetic field strength in the constant temperature and humidity chamber is adjusted to 7.0 mT by the circuit control module. The period is 52.5 s. The magnetic field waveform is sawtooth-shaped. The rising edge of the waveform is 0.4 mT / s and the falling edge of the waveform is 0.2 mT / s. The waveform of the magnetic field is as follows: Figure 4 As shown, the uniformity of the magnetic field in the constant temperature and humidity chamber is maintained at 55%;

[0065] The air-permeable fresh-keeping box containing the corn kernels in step (2) is placed above the magnetic field generating unit in a constant temperature and humidity chamber, and the temperature in the constant temperature and humidity chamber is controlled to be 25° C. and the relative humidity is 75%, and the storage is carried out for a total of 20 days.

[0066] After storage, the growth of mycelium on the surface of the corn kernels was observed, and the aflatoxin B1 content was determined according to GB 5009.22~2016 "Determination of Aflatoxins B and G in Foods". The results showed that after 20 days of storage, no obvious mold mycelium was found on the surface of the corn kernels, and no aflatoxin B1 was detected.

[0067] Comparative Example 1

[0068] A method for preventing corn from mildew, comprising:

[0069] (1) The corn kernels were sieved using a 5-mesh sieve, and moldy, sprouted, and worm-eaten particles were manually removed. According to the direct drying method in GB5009.3-2016, the moisture content of the corn kernels was determined to be 6.4%;

[0070] (2) Accurately weigh 1 kg of corn kernels obtained in step (1) and place them in a clean, breathable fresh-keeping box;

[0071] (3) sterilizing the inner cavity of the constant temperature and humidity chamber by ultraviolet light for 30 minutes, placing the breathable fresh-keeping box containing the corn kernels in step (2) in the constant temperature and humidity chamber, controlling the temperature in the constant temperature and humidity chamber to 25° C. and the relative humidity to 75%, and storing for a total of 20 days.

[0072] After storage, the growth of mycelium on the surface of the corn kernels was observed, and the aflatoxin B1 content was determined according to GB 5009.22~2016 "Determination of Aflatoxins B and G in Foods". The results showed that after 20 days of storage, a large number of mold mycelium appeared on the surface of the corn kernels, and the aflatoxin B1 content reached 32μg / kg, exceeding the national standard of 20μg / kg for aflatoxin B1 in corn and its products (GB 2761~2017).

[0073] Example 4

[0074] A method for preventing rice from being pest-prone, the method for preventing rice from being pest-prone is implemented based on a grain mildew-proof and pest-proof storage device provided in Example 1, the ratio of the area of ​​the through hole on the coil skeleton used in this embodiment to the area of ​​the coil skeleton covered by the excitation coil is 1:27, and the method specifically comprises:

[0075] (1) The rice was sieved using a 12-mesh sieve, and moldy, sprouted, worm-eaten particles were manually removed. According to the direct drying method in GB5009.3-2016, the moisture content of the rice was measured to be 6.7%;

[0076] (2) Accurately weigh 2 kg of the rice obtained in step (1) and place it in a clean, breathable fresh-keeping box;

[0077] (3) The inner cavity of the constant temperature and humidity chamber is sterilized by ultraviolet light for 30 minutes. The magnetic field generating unit is placed in the constant temperature and humidity chamber. The magnetic field strength in the constant temperature and humidity chamber is adjusted to 6.0 mT by the circuit control module. The cycle is 50 s. The magnetic field waveform is sawtooth-shaped. The rising edge of the waveform is 0.2 mT / s and the falling edge of the waveform is 0.3 mT / s. The waveform of the magnetic field is as follows: Figure 5 As shown, the uniformity of the magnetic field in the constant temperature and humidity chamber is maintained at 70%;

[0078] The air-permeable fresh-keeping box containing the rice grains in step (2) is placed above the magnetic field generating unit in a constant temperature and humidity box, and the temperature in the constant temperature and humidity box is controlled to be 30° C. and the relative humidity is 80%, and the storage is carried out for a total of 30 days.

[0079] After storage, the growth of rice weevils in the rice was observed, and the aflatoxin B1 content was determined according to GB 5009.22~2016 "Determination of Aflatoxins B and G in Foods". The results showed that after 30 days of storage, no rice weevils were found in the rice and no aflatoxin B1 was detected.

[0080] Comparative Example 2

[0081] A method for preventing rice from being pest-prone, specifically comprising:

[0082] (1) The rice was sieved using a 12-mesh sieve, and moldy, sprouted, worm-eaten particles were manually removed. According to the direct drying method in GB5009.3-2016, the moisture content of the rice was measured to be 6.6%;

[0083] (2) Accurately weigh 2 kg of the rice obtained in step (1) and place it in a clean, breathable fresh-keeping box;

[0084] (3) sterilizing the inner cavity of the constant temperature and humidity chamber by ultraviolet light for 30 minutes, placing the rice in step (2) in the constant temperature and humidity chamber, and controlling the temperature in the constant temperature and humidity chamber to be 30° C. and the relative humidity to be 80%, and storing the rice for a total of 30 days.

[0085] After storage, the growth of rice weevils in the rice was observed, and the aflatoxin B1 content was determined according to GB 5009.22~2016 "Determination of Aflatoxins B and G in Foods". The results showed that after 30 days of storage, 26 rice weevils were visible in the rice, and the aflatoxin B1 content reached 12μg / kg, exceeding the national standard of 10μg / kg for aflatoxin B1 in rice (GB 2761~2017).

[0086] Example 5

[0087] A method for preventing rice from being pest-prone, the method for preventing rice from being pest-prone is implemented based on Example 1, and the method specifically comprises:

[0088] (1) The rice was sieved using a 12-mesh sieve, and moldy, germinated, and worm-eaten particles were manually removed. The moisture content of the rice was determined to be 6.8% according to the direct drying method in GB5009.3-2016;

[0089] (2) Accurately weigh 2 kg of the rice obtained in step (1) and place it in a clean, breathable fresh-keeping box;

[0090] (3) The inner cavity of the constant temperature and humidity chamber is sterilized by ultraviolet light for 30 minutes, and a weak magnetic field generating device is placed in the constant temperature and humidity chamber. A pulse magnetic field is formed in the constant temperature and humidity chamber through a circuit control module. The magnetic field intensity of the pulse magnetic field is 6.0 mT, the magnetic field waveform is a rectangular wave, the period is 40 seconds, the duty cycle is 75%, and the waveform of the magnetic field is as follows: Figure 6 As shown; the rice in step (2) is placed on a weak magnetic field generating device in a constant temperature and humidity chamber, and the temperature in the constant temperature and humidity chamber is controlled to be 30°C and the relative humidity is 80%, and stored for a total of 30 days.

[0091] After storage, the growth of rice weevils in the rice was observed, and the aflatoxin B1 content was determined according to GB 5009.22~2016 "Determination of Aflatoxins B and G in Foods". The results showed that after 30 days of storage, 5 rice weevils were visible in the rice, and no aflatoxin B1 was detected.

[0092] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for storing grains to prevent mildew and insects, characterized in that: include: A magnetic field is applied in a storage environment of grains, wherein the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2~0.5mT / s, the falling edge is 0.2~0.5mT / s, the magnetic field strength of the magnetic field is 5.5-7.0mT, and at least one of the magnetic field strength and the magnetic field period of the magnetic field is adjusted so that the magnetic field uniformity in the storage space is higher than 50%.

2. The storage method according to claim 1, characterized in that: The period of the magnetic field is 22-70s.

3. The storage method according to claim 1, characterized in that: Specifically include: The magnetic field is applied from one side of the storage space by a magnetic field generating unit.

4. The storage method according to claim 1, characterized in that: The magnetic field generating unit includes a coil frame and an excitation coil, the surface of the coil frame has a first area and a second area surrounding the first area, the first area is provided with a through hole, the excitation coil is arranged in the second area and distributed around the through hole, wherein the ratio of the area of ​​the through hole to the area of ​​the second area of ​​the coil frame covered by the excitation coil is 1:23-1:

30.

5. The storage method according to claim 4, characterized in that: The coil frame is parallel to the radial section of the storage space, and the outer contour shape of the coil frame and the area of ​​the region enclosed by the outer contour are the same as the contour and area of ​​the radial section of the storage space.

6. The storage method according to claim 1, characterized in that: The magnetic field generating unit further includes a circuit control module, and the storage method further includes: adjusting at least one of the magnetic field strength and the magnetic field period of the magnetic field by the circuit control module to maintain the magnetic field uniformity in the storage space at 55-85%.

7. The storage method according to claim 6, characterized in that: The storage method comprises: maintaining the uniformity of the magnetic field in a space 5 cm away from the magnetic field generating unit at 55-85%.

8. The storage method according to claim 1, characterized in that: Also includes: The temperature in the storage environment is maintained at 8-30° C., and the humidity is maintained at 50-85%.

9. The storage method according to claim 1, characterized in that: The cereals include at least one of peanuts, soybeans, rice, oats and corn, or a combination of two or more thereof.

10. A grain storage device for preventing mildew and insects, characterized in that include: a storage unit including a storage space for accommodating grain; A magnetic field generating unit, which is at least used to apply a magnetic field in the storage space, wherein the magnetic field waveform of the magnetic field is sawtooth-shaped, and the rising edge of the magnetic field waveform is 0.2-0.5 mT / s, the falling edge is 0.2-0.5 mT / s, the magnetic field intensity of the magnetic field is 5.5-7.0 mT, and the period of the magnetic field is 22-70 s; a temperature regulating unit, which is at least used to regulate the temperature in the storage space; The humidity adjustment unit is at least used for adjusting the humidity in the storage space.

11. The grain mildew and insect-proof storage device according to claim 10, characterized in that: The magnetic field generating unit is arranged at one side of the storage space.

12. The grain mildew and insect-proof storage device according to claim 10, characterized in that: The magnetic field generating unit includes a coil frame and an excitation coil, the surface of the coil frame has a first area and a second area surrounding the first area, the first area is provided with a through hole, the excitation coil is arranged in the second area and distributed around the through hole, wherein the ratio of the area of ​​the through hole to the area of ​​the second area of ​​the coil frame covered by the excitation coil is 1:23-1:

30.

13. The grain mildew and insect-proof storage device according to claim 12, characterized in that: The coil frame is parallel to the radial section of the storage space, and the outer contour shape of the coil frame and the area of ​​the region enclosed by the outer contour are the same as the contour and area of ​​the radial section of the storage space.

14. The grain mildew and insect-proof storage device according to claim 10 or 12, characterized in that: The magnetic field generating unit comprises a single excitation coil wound on a coil frame, the wire diameter of the excitation coil is 0.2-2.5 mm, and the number of turns of the excitation coil is 500-2000 turns.

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