Super-long-term grain storage method and production line

Abstract

The invention discloses an ultra-long-term grain storage method and a production line, and belongs to the technical field of grain storage. According to the ultra-long-term grain storage method disclosed by the invention, the grains are subjected to impurity removal, sterilization, dehydration and drying treatment through scientific means, and are matched with quick-freezing and vacuum freeze-drying technologies, so that on one hand, the quick-freezing can shape the grains, lock the freshness of the grains, and relieve heat rise and self-heating of the grains generated in the previous process, thereby making preparations for vacuum freeze-drying treatment; the freeze-drying treatment efficiency is improved; on the other hand, the grain characters can be kept to the maximum extent, the positions originally occupied by water of the freeze-dried grains are changed into gaps, the phenomenon of broken rice can be reduced, the shelf life of the grains is effectively prolonged, the subsequent rehydration effect is faster and better, and the nutrition and flavor of the grains are kept; and vacuum packaging is matched, so that the storage life of the grains is remarkably prolonged. In general, through cooperation of grain treatment, the problems that grain storage is large in comprehensive loss and short in rotation time can be solved, toxic and harmful substances are few, energy consumption is low, ultra-long-time storage can be achieved, and the storage life can even reach 30 years or above; in addition, grain assembly line treatment can be achieved, the treatment efficiency is high, the yield is large, loss is small, and the large-scale storage requirement of grains can be met.

Description

Technical Field

[0001] The present invention relates to the field of grain processing and storage, and more specifically, to an ultra-long-term grain storage method and production line. Background Art

[0002] At present, domestic grain storage is mainly carried out by improving the hardware facilities such as air tightness and thermal insulation of grain warehouses, and adopting temperature and humidity control, gas regulation and other means for storage. Although the use of warehouse monitoring systems, temperature control systems and other means of supervision has greatly improved compared with previous grain storage methods, the storage process still requires frequent sampling, heavy workload, high losses, frequent grain rotation, high economic losses, and increased corruption.

[0003] Specifically, the current grain storage process mainly includes the following problems:

[0004] 1. Storage period: Grain will gradually age during storage. After a certain period of time, the internal structure of the grain will loosen, the enzyme activity will decrease, and the respiratory capacity will decline, resulting in a decrease in nutritional value. After the grain has been stored for a specified period of time (usually 4 to 5 years), it can no longer be sold.

[0005] 2. Pest problem: Whether it is national storage or personal storage of small amounts of grain, pests are the most troublesome problem. Pests not only affect the quality and quantity of grain, but may also cause the grain to mold and rot.

[0006] 3. Mildew problem: Grain is easily affected by moisture and temperature during storage, causing mildew. Mildew not only affects the taste and nutritional value of grain, but may also produce toxic substances, affecting food safety.

[0007] 4. Rodent damage: Rodent damage is also a common problem during grain storage. Rodents not only eat grain, but also leave excrement in the grain, contaminating it.

[0008] 5. Poor storage facilities: Many farmers and small grain purchasing companies have poor storage facilities and lack scientific knowledge of grain storage, resulting in serious grain losses. For example, farmers often store grain on the ground, which can easily lead to grain mold, rot and rodent damage.

[0009] 6. Insufficient drying capacity: Grain needs to be dried in time after harvest, otherwise it is easy to mold and sprout. However, many farmers and small grain purchasing companies lack drying equipment and often use manual drying, resulting in grain loss.

[0010] 7. Storage environment issues: Grain storage requires a suitable environment, including temperature, humidity and ventilation conditions. Many storage facilities fail to meet these requirements, causing grain to deteriorate during storage. For example, some grain silos do not dissipate heat well, causing grain to "burn."

[0011] 8. Lack of scientific grain storage awareness: Many farmers and small grain purchasing companies lack the awareness and knowledge of scientific grain storage, resulting in serious grain losses during storage. Promoting scientific grain storage technology and facilities is an important measure to reduce grain losses.

[0012] 9. Post-harvest grain losses: In the grain production, storage and consumption links, problems such as insufficient awareness of scientific grain storage, insufficient awareness of preventing waste, and low level of scientific grain storage still exist, leading to serious post-harvest grain losses.

[0013] 10. Insufficient grain storage facilities: Many farmers and small grain purchasing companies lack adequate storage facilities, resulting in open-air storage of grain, which in turn causes serious waste.

[0014] With the development of agricultural science and technology, although various scientific and technological means and equipment are relatively mature, there is still a lack of comprehensive grain processing methods. Most of the existing grain processing and storage methods are simple combinations of single or multiple processing methods for grain. There is a lack of comprehensive consideration of the grain processing process, which leads to mutual interference among the various processing processes, affecting the grain processing effect and efficiency, and unable to achieve the purpose of ultra-long-term grain storage. Summary of the invention

[0015] 1. Technical problem to be solved by the invention

[0016] The purpose of the present invention is to overcome the above-mentioned shortcomings of existing grain storage, provide a super long-term grain storage method and production line, adopt the technical scheme of the present invention, remove impurities, sterilize, dehydrate and dry grains by scientific means, cooperate with quick freezing and vacuum freeze drying technology, on the one hand, quick freezing can shape grains, lock the freshness of grains, and eliminate the heat rise and grain self-heating generated by the previous process of grains, prepare for vacuum freeze drying, and improve the efficiency of freeze drying; on the other hand, it can keep the grain properties to the greatest extent, and the position occupied by water in the freeze-dried grains becomes a gap, which can reduce the phenomenon of broken rice, effectively extend the shelf life of grains, and the subsequent rehydration effect is faster and better, and the nutrition and flavor of grains are maintained; with vacuum packaging, the shelf life of grains is significantly extended. In general, the present invention can solve the problems of large comprehensive loss and short rotation time of grain storage through the coordinated cooperation of grain processing, and there are few toxic and harmful substances, less energy consumption, and ultra-long storage can be achieved, and the shelf life can even reach more than 30 years; in addition, grain assembly line processing can be realized, with high processing efficiency, large output, and less loss, which can meet the needs of large-scale grain storage.

[0017] 2. Technical solution

[0018] In order to achieve the above object, the technical solution provided by the present invention is:

[0019] An ultra-long-term grain storage method of the present invention comprises the following steps:

[0020] S1. Impurity removal: The grains that meet the requirements are treated to reduce the impurity content in the grains to less than 0.2%;

[0021] S2. Sterilization: Use photocatalyst, static electricity and ultraviolet light to sterilize grains in a compound manner to kill microorganisms and pests in grains;

[0022] S3, dehydration and drying: the grains after impurity removal and sterilization are subjected to secondary dehydration and drying treatment, and the moisture content of the grains after dehydration and drying treatment is not lower than the critical point of broken rice;

[0023] S4, quick freezing: quick freezing the grains after secondary dehydration and drying, and quickly cooling and freezing the grains;

[0024] S5. Vacuum freeze drying: vacuum freeze drying the quick-frozen grains to control the moisture content of the grains to less than 2%;

[0025] S6. Packaging and warehousing: The processed grains are stored in ton boxes or vacuum packaging bags.

[0026] Furthermore, in step S1, a double impurity removal method of electrostatic adsorption impurity removal and mechanical impurity removal by an impurity remover is used to perform secondary fine impurity removal on the grains.

[0027] Furthermore, in step S3, electromagnetic drying technology is used to perform electromagnetic wave heating and drying on the grains.

[0028] Furthermore, in step S4, the grains are quick-frozen by using one of a push-type quick freezer, a spiral quick freezer and a lifting quick freezer, the quick-freezing temperature is controlled below -30°C, and the freezing time is controlled within 60 minutes.

[0029] Furthermore, in step S5, a spiral vacuum barrel is used to perform vacuum freeze-drying on the grains. The grains are spirally moved and freeze-dried in the spiral vacuum barrel, and the pressure in the spiral vacuum barrel is controlled at 0.1-0.3 mbar.

[0030] Furthermore, in step S6, the ton box or vacuum packaging bag has a labeling and scanning function, and is automatically put into storage by scanning the code, and can be scanned and shipped out according to the outbound list; during the warehousing process, the code is manually labeled and scanned, and the ton box or vacuum packaging bag is transported to the stacking position in the vacant area by the AGV transporter, and the WMS warehouse management system controls the intelligent crane to hoist and stack it to the corresponding stacking position; during the outbound process, the number of pick-up is entered, and the WMS warehouse management system controls the intelligent crane and AGV transporter to move the stored grains to the outbound docking station, and the grains can be shipped out of the warehouse only after manual scanning.

[0031] Furthermore, after the grain is shipped out of the warehouse, a rehydration and conditioning step is also included to restore the moisture content of the grain through a rehydration and conditioning line.

[0032] The ultra-long-term grain storage production line of the present invention comprises a grain feeding tank, a physical impurity removal device, a sterilization device, a secondary dehydration and drying device, a quick freezing device, a vacuum freeze drying device, a docking station and an AGV transport vehicle, which are arranged in sequence.

[0033] The discharge port of the grain feeding tank is connected to the feed port of the physical impurity removal device, and the grains meeting the requirements are stored in the grain feeding tank;

[0034] The physical impurity removal device includes two parts: electrostatic adsorption impurity removal and impurity removal by a mechanical impurity remover. The grains move toward the sterilization device in the physical impurity removal device, and undergo secondary impurity removal by electrostatic adsorption and impurity removal by a mechanical impurity remover, thereby reducing the impurity content in the grains to less than 0.2%.

[0035] The feed inlet of the sterilization device is connected with the discharge outlet of the physical impurity removal device. The sterilization device is provided with a photocatalyst sterilization mechanism, an electrostatic sterilization mechanism and an ultraviolet sterilization mechanism, and the photocatalyst sterilization mechanism, the electrostatic sterilization mechanism and the ultraviolet sterilization mechanism are used to sterilize the grains.

[0036] The secondary dehydration and drying device adopts an electromagnetic dryer, and the feed inlet of the secondary dehydration and drying device is connected with the discharge outlet of the sterilization device;

[0037] The feed inlet of the quick freezing device is connected to the discharge port of the secondary dehydration drying device, and the discharge port of the quick freezing device is connected to the feed inlet of the vacuum freeze drying device;

[0038] The vacuum freeze-drying device comprises a spiral vacuum barrel, wherein the spiral vacuum barrel has a spiral conveying bin for conveying grains, and the discharge port of the spiral vacuum barrel has a packaging mechanism;

[0039] The docking station is arranged at the discharge end of the vacuum freeze-drying device, and the grains are packaged and stored in totes or vacuum packaging bags at the docking station; the AGV transport vehicle is located at the end of the docking station, and is used to transport the totes or vacuum packaging bags containing the grains into the warehouse for stacking and storage.

[0040] Furthermore, the vacuum freeze-drying devices are configured with two or more, and the multiple vacuum freeze-drying devices are used in rotation according to production conditions to form an assembly line.

[0041] Furthermore, the tonnage box is an Internet of Things tonnage box, which is formed by integral injection molding of plastic and metal frame, and has a grain inlet, a grain outlet, a vacuum port and a sampling port. The tonnage box also has a deoxidation drying chamber, a positioning and detection sensor, and an alarm;

[0042] The vacuum packaging bag is made of PET+Al+PE+Ag and has a pressure-resistant layer.

[0043] 3. Beneficial effects

[0044] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0045] (1) The present invention provides an ultra-long-term grain storage method and production line, wherein the processing process includes impurity removal, sterilization, dehydration and drying, quick freezing, vacuum freeze drying and packaging and storage, wherein the impurity content in the grains can be reduced to below 0.2% after impurity removal, thereby improving the storage stability of the grains; the grains are sterilized by a triple sterilization method of photocatalyst, static electricity and ultraviolet light, which can effectively kill microorganisms and pests in the grains, and can also inhibit bacterial growth and virus activity, thereby achieving the effects of air purification, sterilization, deodorization and mildew prevention; the grains after secondary dehydration and drying can reduce the overall time of subsequent freeze-drying treatment, improve production efficiency, and control the moisture content of the grains after dehydration and drying to be not less than the critical point of broken rice, thereby reducing the occurrence of broken rice while meeting the requirements of long-term storage, and ensuring the stability of the structure and shape of the grains; quick freezing can quickly shape and lock the grains, and improve the efficiency of subsequent freeze-drying; vacuum freeze-drying can further reduce the moisture content of the grains while maintaining the grain properties, effectively extending the shelf life of the grains, and the subsequent rehydration effect is faster and better, maintaining the nutritional value and flavor of the grains. In general, the present invention can solve the problems of large comprehensive loss and short rotation time in grain storage through the coordinated cooperation of grain processing, and has less toxic and harmful substances and less energy consumption, so it can achieve ultra-long-term storage, and the shelf life can even reach more than 30 years; in addition, it can realize grain assembly line processing with high processing efficiency, large output and low loss, which can meet the needs of large-scale grain storage.

[0046] (2) The present invention provides an ultra-long-term grain storage method and production line, which adopts electromagnetic drying technology to perform electromagnetic wave heating and drying on grains. The grains are treated by a high-voltage electric field, which is beneficial to the effect of the electric field on water molecules, causing them to move and promote the collision and aggregation of water molecules to become larger, which is convenient for the subsequent separation and dehydration process and can significantly improve the dehydration efficiency of grains. In addition, the electromagnetic drying technology has the advantages of uniform heating, high efficiency and energy saving, rapid drying, reduced oxidation, easy control, reduced pollution, improved product quality, and reduced losses.

[0047] (3) The present invention provides an ultra-long-term grain storage method and production line, which uses a push-type quick freezer, a spiral quick freezer, and a lifting quick freezer to quick-freeze grains. The quick freezing temperature is controlled below -30°C, and the freezing time is controlled within 60 minutes. The quick freezing efficiency is high and the output is large, and it can be suitable for assembly line production.

[0048] (4) The present invention provides an ultra-long-term grain storage method and production line, which uses a spiral vacuum barrel to perform vacuum freeze-drying on the grains. The grains move in a spiral manner and are freeze-dried in the spiral vacuum barrel. The pressure in the spiral vacuum barrel is controlled at 0.1 to 0.3 mbar. The spiral conveying method is used to facilitate the entry of the grains and control the grain stacking thickness, thereby ensuring the uniformity and efficiency of the freeze-drying process. Furthermore, the material can be directly discharged from the lower part of the spiral vacuum barrel to form a production line and improve production efficiency.

[0049] (5) The present invention provides an ultra-long-term grain storage method and production line, which uses ton boxes or vacuum packaging bags to vacuum-pack grains, and the ton boxes or vacuum packaging bags have a labeling and scanning function, which can automatically enter the warehouse for storage by scanning the code, and can scan the code for outbound delivery according to the outbound delivery list; in conjunction with the AGV transport vehicle and the WMS warehouse management system, it can realize automated inbound and outbound storage management, reduce the number of management personnel, save rotation time, eliminate major human risks, and reduce the cost of grain storage.

[0050] (6) The ultra-long-term grain storage production line of the present invention is equipped with two or more vacuum freeze-drying devices. The multiple vacuum freeze-drying devices are used in rotation according to production conditions to form an assembly line. The number of vacuum freeze-drying devices can be increased or decreased according to the situation to improve production efficiency.

[0051] (7) An ultra-long-term grain storage production line of the present invention, wherein the tonnage box is an Internet of Things tonnage box, which is formed by integral injection molding of plastic and metal frame, and has a grain inlet, a grain outlet, a vacuum port and a sampling port. The tonnage box is also provided with a deoxidation drying bin, a positioning and detection sensor, and an alarm. The tonnage box has high structural strength, can meet the needs of high-space stacking, saves warehouse space, and can realize functions such as positioning tracking, temperature and humidity detection and alarm, and can record various operation processes such as grain in and out, displacement path, environmental monitoring, and grain quality;

[0052] The vacuum packaging bag is made of PET+Al+PE+Ag composite bag and has a pressure-resistant layer. It has long-lasting antibacterial, light-proof, drying, and air-blocking effects. It is convenient and quick to store for a long time and is suitable for finished product packaging of rice and other grains. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A process flow chart of an ultra-long-term grain storage method of the present invention;

[0054] Figure 2 A schematic diagram of a combined impurity removal method for physical secondary impurity removal in an ultra-long-term grain storage method of the present invention;

[0055] Figure 3 A schematic diagram of a combined sterilization method of triple combined sterilization in an ultra-long-term grain storage method of the present invention;

[0056] Figure 4 It is a side structural schematic diagram of an ultra-long-term grain storage production line of the present invention;

[0057] Figure 5 The figure is a schematic diagram of the structure of a super-long-term grain storage production line according to the present invention from a top view.

[0058] Explanation of the symbols in the schematic diagram:

[0059] 1. Grain feeding tank; 2. Physical impurity removal device; 3. Sterilization device; 4. Secondary dehydration and drying device; 5. Quick freezing device; 6. Vacuum freeze drying device; 7. Docking station; 8. AGV transport vehicle; 9. Ton box; 10. Intelligent driving. DETAILED DESCRIPTION

[0060] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0061] [Example 1]

[0062] This embodiment discloses a method for storing grain for an extremely long period of time. Figure 1 As shown, the ultra-long-term grain storage method comprises the following steps:

[0063] S1. Impurity removal: The grains that meet the requirements are treated to reduce the impurity content in the grains to less than 0.2%. The grains that meet the requirements refer to the grains that meet the national quality requirements and warehouse standards, such as rice, corn, wheat and other raw grains. These grains inevitably contain impurities, such as mud, sand, stones, insect pests, insect eggs, barnyard grains, weeds, shrunken grains, spike stalks, leaves, chaff ash, etc. These impurities often have high water content, high bacteria content, strong hygroscopicity, high respiration intensity, and are very unstable. Small impurities such as chaff ash will block or reduce the porosity of the grain pile, which can easily cause the accumulation of moisture and heat in the pile, leading to the proliferation of mold and warehouse insects. Therefore, the grains need to be impurity-free before storage, such as wind blowing, screening, mechanical impurity removal, etc.

[0064] In this embodiment, secondary fine impurity removal is used to reduce the impurity content in the grain to below 0.2% to improve the storage stability of the grain. Figure 2As shown, in this embodiment, the double impurity removal method of electrostatic adsorption impurity removal and impurity removal by impurity removal machine is used to carry out secondary fine impurity removal on grains. The secondary fine impurity removal is mainly to remove some missed dust and tiny impurities, which will be mixed with a lot of microorganisms and insect eggs. The use of electrostatic adsorption and impurity removal machine can finely remove these microorganisms, insect eggs and dust and other impurities, which can ensure the quality and safety of grains and improve the processing and edible value of grains. In practical applications, electrostatic adsorption impurity removal and mechanical impurity removal cooperate with each other to achieve a more efficient impurity removal effect. Specifically, the mechanical impurity removal method can be used to remove most of the obvious impurities first, and then the electrostatic adsorption method can be used to remove more subtle or more polar impurities. Such a double impurity removal method can significantly improve the purity and quality of grains and meet the high standards of modern grain processing. Specifically, mechanical impurity removal usually includes screening, air separation, magnetic separation and flotation, combined with primary screening and secondary screening technology. The first-stage screening uses a drum filter to effectively remove impurities such as stones and powders that are smaller than the grains in diameter. It has higher efficiency and lower noise than vibrating screens. The second-stage screening further selects the grains through a blower to remove light impurities such as chaff, unfilled grains and dust, ensuring that the final grains are full and have good color. Electrostatic adsorption impurity removal utilizes the differences in polarization characteristics of different substances in an electric field. During the grain processing process, the impurities in the grains are graded and removed through an electrostatic adsorption separation platform. Then, by adjusting parameters such as charging time, flying speed and plate voltage, the best removal effect of impurities of different levels is achieved.

[0065] S2. Sterilization: Use photocatalyst, static electricity and ultraviolet light to sterilize grains in a compound manner to kill microorganisms and pests in grains. Microorganisms are one of the important factors affecting the stability of food storage. The microorganisms that harm grain storage mainly include microorganisms that live on rice grains, including fungi (including toxic fungi and fermentative fungi), bacteria, actinomycetes, etc. The main species are: black ink, racemose hair, restricted ink, Amsterdam Aspergillus, fumigatus, black Aspergillus, white Aspergillus, versicolor, aflatoxin, Penicillium citrinum, aflatoxin, Penicillium oxalicum, and garden arc Aspergillus. The main pests that harm grain storage are: corn weevils, rice weevils, saw-saw grain beetles, large grain beetles, long-horned grain beetles, grain borers, Indian grain moths, wheat moths, rice moths, rice lice, and putrescent tyrophagous mites. Grain sterilization has important significance in preventing mildew, extending shelf life, reducing losses, ensuring food safety, improving processing quality, and reducing odor. During the storage process, if there are bacteria and mold in grains, it is easy to cause mildew. Mildew not only affects the appearance and taste of grains, but also produces toxic substances, such as aflatoxin, which is harmful to human health. Through sterilization treatment, the shelf life of grains can be significantly extended. The growth of bacteria and mold will consume the nutrients in grains and cause grain deterioration. Controlling the growth of microorganisms can delay the aging process of grains and maintain their freshness. During the storage process, if mildew and insect pests occur in grains, a large amount of loss will occur. Through sterilization treatment, these losses can be reduced and the utilization rate of grains can be improved. Through sterilization treatment, it can also ensure that grains are not contaminated by microorganisms during storage and processing, ensuring food safety. If grains are contaminated by microorganisms during processing, it will affect the quality of processed products. Through sterilization treatment, the processing quality of grains can be improved and better quality food can be produced. The growth and reproduction of microorganisms will produce odors, which will affect the consumption of grains. Through sterilization treatment, these odors can be reduced and the eating experience of grains can be improved.

[0066] like Figure 3As shown, in this embodiment, the composite sterilization of grains is carried out by means of triple sterilization of photocatalyst, static electricity and ultraviolet rays, and 360° all-round sterilization is achieved. The composite sterilization of grains by means of triple sterilization of photocatalyst, static electricity and ultraviolet rays is an efficient and environmentally friendly sterilization technology, which can effectively kill microorganisms and pests in grains and ensure the safe storage of grains. Among them, photocatalyst technology uses specific materials (such as titanium dioxide or tungsten oxide) to produce active oxygen under illumination (including sunlight and indoor lighting), which can decompose the source of odor and inhibit bacterial proliferation and viral activity. Photocatalyst is an efficient and environmentally friendly material that uses light energy to decompose pollutants. Its principle is that under illumination conditions, holes and free electrons are formed on the surface of photocatalyst materials, combined with water and oxygen in the air, and redox reactions occur to form strong oxidizing hydroxyl radicals and superoxide anion radicals. These free radicals can decompose harmful gases and some inorganic substances in the air, and can inhibit bacterial growth and viral activity, achieving air purification, sterilization, deodorization, and mildew prevention effects. In addition, the titanium dioxide in the photocatalyst has a strong ability to absorb ultraviolet rays, which can protect the surface of the sprayed object from ultraviolet rays and effectively prevent the aging of the sprayed object; and as a catalyst, the photocatalyst will not be consumed during the reaction process. Electrostatic sterilization produces a large number of high-energy particles, ultraviolet light and free radicals through high-voltage discharge. These factors can break the cell wall of bacteria, destroy the genetic material of viruses, and cause the death of bacteria and viruses. At the same time, the electrostatic filter can adsorb particulate matter or aerosols in the air, making the bacteria and viruses attached to them inactive. In addition, modern electrostatic filter technology is very mature and has safety protection measures to ensure safe use. The UVC band in ultraviolet rays (especially ultraviolet rays with a wavelength of 253.7nm) can effectively destroy the DNA or RNA structure in the cells of microbial organisms, causing cell death and achieving the effect of sterilization and disinfection. UVC belongs to the broad-spectrum bactericidal class and can kill all microorganisms, including bacteria, viruses, spores and fungi. The effect of ultraviolet sterilization and disinfection is related to factors such as radiation illumination and radiation dose, and different disinfection objects require different doses. The use of photocatalyst, static electricity and ultraviolet light for triple sterilization not only improves the sterilization efficiency, but also broadens the sterilization spectrum, making the protection of grains more comprehensive, which plays a very critical role in grain storage. Through this composite sterilization technology, the use of chemical pesticides can be greatly reduced, ensuring food safety and human health, while also helping to reduce the impact on the environment.

[0067] S3, dehydration and drying: The grains after impurity removal and sterilization are subjected to secondary dehydration and drying treatment, and the moisture content of the grains after dehydration and drying treatment is not lower than the critical point of broken rice. Grains are generally required to have a moisture content of less than 14% when entering the warehouse. For long-term storage, the moisture content must be reduced to a lower level. However, excessive drying will make broken rice more likely to occur, so the moisture content of the grains after dehydration and drying treatment is not lower than the critical point of broken rice. The critical point of broken rice is determined by experiments on the type of grain. During the dehydration and drying process, the drying efficiency and temperature can be adjusted according to the moisture content of the grains. In summer, room temperature can be used directly. After secondary dehydration and drying treatment, the overall time of the subsequent freeze-drying treatment can be reduced and production efficiency can be improved; and the moisture content of the grains after dehydration and drying treatment is controlled to be not lower than the critical point of broken rice, which can reduce the phenomenon of broken rice while meeting the requirements of long-term storage and ensure the stability of the structure and shape of the grains.

[0068] In this embodiment, electromagnetic drying technology is used to heat and dry the grains with electromagnetic waves. Electromagnetic drying technology treats the grains with a high-voltage electric field, which is beneficial to the effect of the electric field on water molecules, causing them to move and cause the water molecules to collide and aggregate to become larger, which is convenient for the subsequent separation and dehydration process, and can significantly improve the dehydration efficiency of the grains. Electromagnetic drying technology also has the following advantages:

[0069] 1) Uniform heating and precise temperature control: Electromagnetic heating can achieve precise temperature control. By adjusting the current to control the heating intensity, the grains can be heated evenly during the drying process, avoiding local overheating or uneven drying, thus ensuring the quality and nutrition of the grains.

[0070] 2) High efficiency and energy saving: Electromagnetic drying technology uses the principle of electromagnetic induction to directly convert electrical energy into heat energy efficiently, avoiding a large amount of heat loss in traditional heating methods. The thermal efficiency of this heating method is very high, reaching more than 95%, thereby significantly reducing energy consumption and production costs;

[0071] 3) Rapid drying: Electromagnetic waves can penetrate the material and directly heat the moisture inside the material, which can quickly reduce the moisture content in the grain to a safe storage range of 6% to 8% in a short period of time, thereby accelerating the drying process, shortening the drying time, and improving production efficiency, providing good conditions for the long-term storage of grains and subsequent assembly line processing;

[0072] 4) Reduce oxidation: During the electromagnetic drying process, the material has less contact with the outside air, which reduces the oxidation of the material during the drying process and maintains the original color and nutritional components of the material;

[0073] 5) Easy to control and low maintenance cost: Electromagnetic drying equipment is usually equipped with advanced control systems, which can accurately control the drying temperature and time, adapt to the drying requirements of different materials, and improve the controllability and stability of the drying process; the maintenance cost is relatively low, which improves the overall production efficiency;

[0074] 6) Reduce pollution: No chemical agents are used in the electromagnetic drying process, which reduces pollution to the environment and chemical residues in the product, meeting the requirements of modern green production;

[0075] 7) Improve product quality: Since the drying process is uniform and fast, electromagnetic drying can better maintain the shape and structure of the material, reduce the breakage and deformation of the material during the drying process, and improve the quality of the final product;

[0076] 8) Reduce loss: Since the drying process is fast and uniform, electromagnetic drying can reduce the loss of materials during the drying process and improve the utilization rate of materials.

[0077] S4, quick freezing: The grains after secondary dehydration and drying are quick frozen to quickly cool and freeze the grains. Quick freezing can quickly shape the grains, lock in the freshness of the grains, put the grains into a dormant state, and ensure the taste of the grains. At the same time, it can eliminate the grains' self-heating and the rise in grain temperature caused by the previous process, and ensure the grains' properties as much as possible, provide pretreatment for the following process, and improve the efficiency of subsequent freeze-drying.

[0078] In this embodiment, one of a push-type quick freezer, a spiral quick freezer and a lifting quick freezer is used to quickly freeze the grains. The quick freezing temperature is controlled below -30°C, and the freezing time is controlled within 60 minutes. The quick freezing efficiency is high and the output is large, which can be applied to assembly line production. The quick freezing technical parameters of the push-type quick freezer, the spiral quick freezer and the lifting quick freezer are as follows:

[0079] 1. Push-type quick freezer:

[0080] Output: 80 kg / h to 150 kg / h;

[0081] Freezing time: 25-40 minutes;

[0082] Freezing temperature: -32±2℃;

[0083] Main body size: 3.36×2.1×2.0m to 4.8×2.1×2.0m;

[0084] Installed power: 1.65KW to 2.2KW;

[0085] Cooling capacity: 8KW to 16KW.

[0086] 2. Spiral quick freezer:

[0087] Output: 300 kg / h to 2000 kg / h;

[0088] Freezing time: 5 to 60 minutes;

[0089] Feed center temperature: ≤15℃;

[0090] Discharge center temperature: -15~-18℃;

[0091] Freezing temperature: -35±2℃;

[0092] Cooling capacity: 55kW to 325kW;

[0093] Installed power: 11kW to 46kW;

[0094] Overall dimensions: 16×2.5×2.3 meters to 23×3.9×2.3 meters.

[0095] 3. Lifting quick freezer:

[0096] Output: 300 kg / h to 500 kg / h;

[0097] Freezing time: 25-40 minutes;

[0098] Freezing temperature: -32±2℃;

[0099] Main body size: 2.8×3.36×3.2 meters to 3.6×3.36×3.2 meters;

[0100] Installed power: 4.4KW to 7.1KW;

[0101] Cooling capacity: 40KW to 60KW.

[0102] S5. Vacuum freeze drying: The grains after quick freezing are vacuum freeze dried to control the moisture content of the grains to less than 2%. Vacuum freeze drying can further reduce the moisture content of the grains while maintaining the properties of the grains, effectively extending the shelf life of the grains, and the subsequent rehydration effect is faster and better, maintaining the nutrition and flavor of the grains. The shape of the grains will hardly change after freeze drying, and the original position occupied by water will become empty, just like a sponge, which is completely different from the grains after sun drying and baking.

[0103] In this embodiment, a spiral vacuum barrel is used to vacuum freeze-dry the grains, and the grains are spirally moved and freeze-dried in the spiral vacuum barrel, and the pressure in the spiral vacuum barrel is controlled at 0.1 to 0.3 mbar. The spiral conveying method can facilitate the entry of grains, facilitate the control of the grain stacking thickness, and ensure the uniformity and efficiency of the freeze-drying process; and the material can be directly discharged at the bottom of the spiral vacuum barrel to form a production line and improve production efficiency. The freeze-drying process is usually divided into three stages: pre-freezing, sublimation drying and analytical drying. The pre-freezing stage freezes the material into a solid state, the sublimation drying stage sublimates the ice crystals under vacuum conditions, and the analytical drying stage removes the remaining bound water. In the pre-freezing stage, the temperature of the freeze-drying chamber can be as low as -55°C or below, usually for 0.1 to 2 hours, and the specific time depends on the material and equipment. In the sublimation drying stage, the plate temperature is controlled at about 10°C to maintain the product temperature at -25°C; the vacuum degree is controlled at about 30% of the saturated vapor pressure corresponding to the product temperature, for example, the saturated vapor pressure corresponding to -25°C is 0.63 mbar, and the vacuum degree should be controlled at about 0.189 mbar; the sublimation time usually takes several minutes to tens of hours depending on the material and equipment. In the analytical drying stage, the temperature is heated to the permitted temperature (for example, 30°C) and maintained until the freeze-drying is completed, and the high vacuum is restored after the product temperature reaches the permitted temperature; the desorption time is set according to the material requirements and other parameters to ensure that the residual moisture reaches the requirement of less than 2%. Specifically in this embodiment, the appropriate pressure of the spiral vacuum barrel is 0.1 to 0.3 mbar. This pressure range is conducive to both heat transfer and sublimation. When the pressure exceeds 0.3 mbar, a vacuum alarm signal should be issued to cut off the heating of the product, and even start the freezer to cool the freeze-drying barrel; vacuuming begins after the pre-freezing is completed, and the vacuum degree is required to reach 1×10 -4 mbar. The grains enter the spiral vacuum barrel for freeze drying for 30 minutes, and the spiral vacuum barrel is designed to process 2 tons each time. In this embodiment, multiple spiral vacuum barrels can be configured for rotation to form an assembly line production to improve efficiency; the number of spiral vacuum barrels can be increased or decreased according to specific circumstances.

[0104] Through the combination of quick freezing and vacuum freeze-drying technology, the properties of grains can be maintained to the greatest extent. The positions originally occupied by water in the freeze-dried grains become gaps, which can reduce the phenomenon of broken rice, effectively extend the shelf life of the grains, and make the subsequent rehydration effect faster and better, maintaining the nutrition and flavor of the grains.

[0105] S6. Packaging and warehousing: The processed grains are stored in ton boxes or vacuum packaging bags. With vacuum packaging, the shelf life of the grains is significantly extended. In this embodiment, the ton boxes or vacuum packaging bags have the function of labeling and scanning codes, and are automatically stored in the warehouse by scanning codes, and can be scanned and shipped out according to the outbound list; during the warehousing process, the ton boxes or vacuum packaging bags are manually labeled and scanned, and the ton boxes or vacuum packaging bags are transported to the stacking position in the vacant area by the AGV transporter, and the WMS warehouse management system controls the intelligent driving and hoisting to the corresponding stacking position; during the outbound process, the number of pick-ups is entered, and the WMS warehouse management system controls the intelligent driving and AGV transporter to move the stored grains to the docking station at the outbound port, and the grains can be shipped out of the warehouse after manual scanning. With the AGV transporter and the WMS warehouse management system, automated inbound and outbound management can be achieved, reducing management personnel, saving rotation time, eliminating major human risks, and reducing grain storage costs.

[0106] After the grains are shipped out of the warehouse, the taste and weight of the grains are reduced due to the low water content. Therefore, after the grains are shipped out of the warehouse, a rehydration and conditioning step is included to restore the moisture content of the grains through the rehydration and conditioning line to the optimal state. The rehydration and conditioning process is similar to the prior art and will not be described in detail again.

[0107] The ultra-long-term grain storage method of the present embodiment uses scientific means to remove impurities, sterilize, dehydrate and dry grains, and cooperates with quick freezing and vacuum freeze-drying technology. On the one hand, quick freezing can shape the grains, lock the freshness of the grains, and eliminate the heat rise and self-heating of the grains generated by the previous process of the grains, prepare for the vacuum freeze-drying process, and improve the efficiency of the freeze-drying process; on the other hand, it can maintain the properties of the grains to the greatest extent. The positions originally occupied by water in the freeze-dried grains become gaps, which can reduce the phenomenon of broken rice, effectively extend the shelf life of the grains, and the subsequent rehydration effect is faster and better, maintaining the nutrition and flavor of the grains; combined with vacuum packaging, the shelf life of the grains is significantly extended.

[0108] [Example 2]

[0109] This embodiment discloses a super long-term grain storage production line. Figure 4 and Figure 5As shown, the ultra-long-term grain storage production line includes a grain feeding tank 1, a physical impurity removal device 2, a sterilization device 3, a secondary dehydration and drying device 4, a quick freezing device 5, a vacuum freeze drying device 6, a docking station 7 and an AGV transport vehicle 8, which are arranged in sequence. The grain feeding tank 1 is a large storage tank for centrally placing grains to be processed; the physical impurity removal device 2 is used to remove various impurities in the grains; the sterilization device 3 is used to kill microorganisms and bacteria in the grains; the secondary dehydration and drying device 4 is used to perform secondary dehydration treatment on the grains; the quick freezing device 5 is used to freeze the grains to quickly lock in freshness, and as a pretreatment for subsequent freeze drying to reduce the heat of the grains; the vacuum freeze drying device 6 is used to further reduce the moisture content in the grains to achieve ultra-long-term storage of the grains; the docking station 7 is used for grain packaging and transportation; and the AGV transport vehicle 8 is used to transfer the packaged grains. The above-mentioned grain feeding tank 1, physical impurity removal device 2, sterilization device 3, secondary dehydration and drying device 4, quick freezing device 5 and vacuum freeze drying device 6 are connected in sequence to form a production line, wherein,

[0110] The discharge port of the grain feeding tank 1 is connected to the feed port of the physical impurity removal device 2, and the grains that meet the requirements are stored in the grain feeding tank 1; the grains in the grain feeding tank 1 enter the physical impurity removal device 2 for impurity removal to remove dust and other tiny impurities mixed in the grains. The physical impurity removal device 2 includes two parts: electrostatic adsorption impurity removal and impurity removal by a mechanical impurity remover. The grains move toward the sterilization device 3 in the physical impurity removal device 2, and impurities are removed while moving. After electrostatic adsorption and mechanical impurity removal by a mechanical impurity remover, the impurity content in the grains is reduced to less than 0.2%. The mechanical impurity removal by the impurity remover can be set before the electrostatic adsorption impurity removal. The impurity remover can remove granular impurities such as insect eggs remaining in the grains, and the electrostatic adsorption can further adsorb and remove tiny impurities such as dust, so that the impurity content in the grains is reduced to less than 0.2%, thereby improving the storage stability of the grains.

[0111] The feed port of the sterilization device 3 is connected with the discharge port of the physical impurity removal device 2, and the grains after impurity removal enter the sterilization device 3. The sterilization device 3 has a photocatalyst sterilization mechanism, an electrostatic sterilization mechanism and an ultraviolet sterilization mechanism, and the grains are sterilized by the photocatalyst sterilization mechanism, the electrostatic sterilization mechanism and the ultraviolet sterilization mechanism. The photocatalyst sterilization mechanism irradiates the photocatalyst material with light energy to form strong oxidizing hydroxyl free radicals and superoxide anion free radicals, decomposes harmful gases and some inorganic substances in the air, and can inhibit bacterial growth and virus activity. The electrostatic sterilization mechanism accelerates the charged particles in the air through a high-voltage electrostatic field. These charged particles neutralize the field source charge under the acceleration, produce a discharge phenomenon, and thus destroy the cell structure of bacteria and viruses. The ultraviolet sterilization mechanism can destroy the nucleic acid structure of microorganisms, block the replication and reproduction of microorganisms, and the titanium dioxide in the photocatalyst sterilization mechanism has a strong ultraviolet absorption characteristic, which can protect the surface of the sprayed object from ultraviolet damage and effectively prevent the aging of the sprayed object. The triple sterilization of photocatalyst, static electricity and ultraviolet light is used to treat the grains 360° without dead ends, which can effectively kill the microorganisms and pests in the grains, and at the same time inhibit the growth of bacteria and the activity of viruses, achieving the effects of air purification, sterilization, deodorization and mildew prevention, while not causing pollution to the grains.

[0112] The secondary dehydration and drying device 4 adopts an electromagnetic dryer, and the feed port of the secondary dehydration and drying device 4 is connected with the discharge port of the sterilization device 3. The sterilized grains directly enter the secondary dehydration and drying device 4 to perform secondary dehydration and drying treatment on the grains. The secondary dehydration and drying device 4 can evenly heat the grains by treating the grains in a high-voltage electric field to achieve the purpose of rapid drying, and can reduce the contact between the grains and oxygen, reduce oxidation, and maintain the original color and nutritional components of the grains.

[0113] The feed inlet of the quick freezing device 5 is connected with the discharge port of the secondary dehydration drying device 4, and the discharge port of the quick freezing device 5 is connected with the feed inlet of the vacuum freeze drying device 6. The grains enter the quick freezing device 5, and the low-temperature airflow exchanges heat with the grains to achieve rapid cooling and freezing. The quick freezing device 5 can be selected from one of a push-type quick freezing machine, a spiral quick freezing machine and a lifting quick freezing machine, which can achieve rapid freezing.

[0114] The vacuum freeze-drying device 6 includes a spiral vacuum barrel, which has a spiral conveying bin for conveying grains, and the discharge port of the spiral vacuum barrel has a packaging mechanism. After being quickly frozen, the grains enter the spiral silo of the spiral vacuum barrel. Since the grains move in the spiral silo, it is convenient for the grains to enter, and it is easy to control the grain stacking thickness, which can ensure the uniformity and efficiency of the freeze-drying process. A certain amount of blowing gas can be given at the inlet to blow the grains to move, and the material can be directly discharged from the lower part of the spiral vacuum barrel to form a production line and improve production efficiency. The above-mentioned vacuum freeze-drying device 6 is configured with two or more units, for example Figure 5There are 5 vacuum freeze drying devices 6, and multiple vacuum freeze drying devices 6 are used in rotation according to production conditions to form an assembly line, forming an efficient assembly line operation mode, and improving the efficiency and output of freeze drying. The spiral vacuum barrel adopts a spiral design, and the interior is a wide flat spiral downward tunnel structure. This design is convenient for assembly line operation and convenient for material injection and subsequent processing. After the material is injected into the freeze drying chamber through the assembly line, the entrance and exit will be closed to ensure that the freeze drying process is carried out in a vacuum environment; during the freeze drying process, the moisture content of the material is reduced to the required index (usually controlled within 4%), and according to the characteristics and storage requirements of different grains, the moisture content can be adjusted to adapt to different situations. After the freeze drying is completed, the discharge port of the spiral vacuum barrel is aligned with the inlet of the ton box or packaging bag to realize automatic discharge; the spiral tunnel storage design allows the material to automatically fall after the discharge port is opened and enter the ton box or packaging bag. The spiral vacuum barrel meets actual needs and reduces energy consumption by adjusting the moisture content. In order to clean the residual materials, a micro air cannon can be installed on the top of the spiral vacuum barrel to clean the residual materials in the tunnel and ensure thorough cleaning.

[0115] The docking station 7 is arranged at the discharge end of the vacuum freeze-drying device 6, and the grains are packaged and stored in the tonnage box 9 or vacuum packaging bags at the docking station 7; the AGV transporter 8 is located at the end of the docking station 7, and is used to deliver the tonnage box 9 or vacuum packaging bags storing the grains into the warehouse for stacking and storage.

[0116] The above-mentioned ton box 9 is an Internet of Things ton box. The ton box 9 is integrally injection molded by plastic and metal frame, and has a grain inlet, a grain outlet, a vacuum port and a sampling port. The ton box 9 also has a deoxygenation drying chamber, a positioning and detection sensor, and an alarm. Specifically, the box plastic is selected from a composite material with food grade, fireproof, rodent and insect proof functions, and silver ion antibacterial components can be added. The ton box 9 can be connected to the Internet through Bluetooth, WiFi, etc., and has GPS positioning, path monitoring, temperature sensor, meter, pressure sensor, air sensor, time and date system, shelf life and alarm functions, etc. The ton box 9 can be dried through the deoxygenation drying chamber, and vacuumed through the vacuum port to vacuum the grain. The vacuum port can also be used to inject inert gases such as nitrogen and use inert gases to store grain. The capacity of each ton box 9 can be designed to be 1 ton, and the box structure has high strength and can be stacked on each other. A forklift slot is provided at the bottom of the ton box 9, and a hoisting card is provided at the top. The ton box can also record various operating processes such as in and out grain, displacement path, environmental monitoring, and grain quality. The above-mentioned ton box design facilitates unified management, eliminates major man-made hidden dangers, reduces management personnel, reduces various losses, is insect-free, rodent-free and mildew-free, has a long storage time, and saves rotation time.

[0117] The above-mentioned vacuum packaging bag is made of PET+Al+PE+Ag composite bag and has a pressure-resistant layer. That is, the material of the vacuum packaging bag is PET (thermoplastic polyester), Al (aluminum foil), PE (polyethylene) and Ag (silver foil) composite from the outside to the inside, which has the effects of long-term antibacterial, light-proof, drying, air-blocking, etc., and is convenient and fast for long-term storage, and is suitable for finished product packaging of rice and other grains.

[0118] Taking the ton box design as an example, the storage and warehousing method of the ultra-long-term grain storage production line of this embodiment is as follows:

[0119] After the grains are processed by the ultra-long-term grain storage production line, they are put into ton boxes for vacuum storage and transported to the docking station 7 for manual labeling and code scanning. The ton boxes 9 are transported to the AGV transporter 8 by the conveyor. The AGV transporter 8 transports them to the vacant area and stops at the stacking position. After that, the arrival instruction is triggered and fed back to the WMS warehouse management system. After analysis and processing, the WMS warehouse management system issues an instruction to the intelligent driving vehicle 10 (such as Figure 5 ), the smart driving vehicle 10 receives the instruction from the WMS warehouse management system to the parking position of the AGV transporter 8 to pick up the goods and stack them in a reasonable position. When food needs to be used or rotated for delivery, the quantity of goods can be entered through the computer, and the WMS warehouse management system automatically issues instructions to the smart driving vehicle 10 and the AGV transporter 8. After receiving the instructions, the smart driving vehicle 10 goes to the designated task point to pick up the goods, and the AGV transporter 8 goes to the corresponding receiving point to wait for transportation. The smart driving vehicle 10 takes out the goods and places them on the AGV transporter 8 and leaves, triggering the loaded command to the AGV transporter 8. The AGV transporter 8 automatically moves the goods to the delivery port docking station, and can be shipped out after manual scanning.

[0120] For stacking of ton container 9, please refer to Figure 5As shown, the storage area can generally be designed to be about 500 square meters, with a flat ground, and large trucks and forklifts can enter and exit. At present, existing bungalow warehouses, silos, round warehouses, etc. can be used. The maximum stacking height of ton box 9 is designed to be 30 meters. If it needs to be higher, just use a "skeleton" with higher strength. Daily inspections can be carried out according to the IoT sensors in the ton box 9 in conjunction with staff sampling inspections. The weight, pressure, temperature, color contrast, gas content and other data acquisition sensors configured in the ton box 9 can provide real-time warnings of problematic ton boxes. The comprehensive data of grain processed in the same batch is very accurate. As long as the data is within the safe range, taking a sample of any box for testing can represent the quality of the same batch, which greatly saves labor costs. The ton box 9 is in a sealed state, and the ambient temperature will have a certain impact on the grain in the ton box 9, but the impact is minimal. In order to ensure a better taste of stored grain, the ambient temperature in the warehouse can be kept within 30°C as much as possible. It can also be stored at room temperature, because after processing the ambient temperature and grain temperature are equal, and the grain temperature will not be higher than the ambient temperature. The ecological environment in the ton box is minimally affected by normal temperature, which can even be ignored.

[0121] For bagged grain, you can refer to the existing method of stacking bagged grain.

[0122] The invention discloses a super long-term grain storage method and production line. The method removes impurities, sterilizes, dehydrates and dries grains by scientific means. The method is combined with quick freezing and vacuum freeze drying technology. On the one hand, quick freezing can shape grains, lock the freshness of grains, and eliminate the heat rise and self-heating of grains generated by the previous process of grains, so as to prepare for vacuum freeze drying and improve the efficiency of freeze drying. On the other hand, the grain properties can be kept to the greatest extent. The positions originally occupied by water in freeze-dried grains become gaps, which can reduce the phenomenon of broken rice, effectively extend the shelf life of grains, and the subsequent rehydration effect is faster and better, so as to maintain the nutrition and flavor of grains. With vacuum packaging, the shelf life of grains is significantly extended. In general, the invention can solve the problems of large comprehensive loss and short rotation time of grain storage through the coordinated cooperation of grain processing, and has less toxic and harmful substances and less energy consumption, so as to realize super long-term storage, and the shelf life can even reach more than 30 years. In addition, the grain assembly line processing can be realized, with high processing efficiency, large output and less loss, which can meet the needs of large-scale grain storage.

[0123] The present invention and its embodiments are described schematically above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and creatively designs a structure and an embodiment similar to the technical solution without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A method for storing grain for an ultra-long period of time. It is characterized in that The following steps are involved: S1. Impurity removal: The grains that meet the requirements are treated to reduce the impurity content in the grains to less than 0.2%; S2. Sterilization: Use photocatalyst, static electricity and ultraviolet light to sterilize grains in a compound manner to kill microorganisms and pests in grains; S3, dehydration and drying: the grains after impurity removal and sterilization are subjected to secondary dehydration and drying treatment, and the moisture content of the grains after dehydration and drying treatment is not lower than the critical point of broken rice; S4, quick freezing: quick freezing the grains after secondary dehydration and drying, and quickly cooling and freezing the grains; S5. Vacuum freeze drying: vacuum freeze drying the quick-frozen grains to control the moisture content of the grains to less than 2%; S6. Packaging and warehousing: The processed grains are stored in ton boxes or vacuum packaging bags.

2. The ultra-long term grain storage method according to claim 1, Features: In step S1, the grains are subjected to secondary fine impurity removal by using a double impurity removal method of electrostatic adsorption impurity removal and mechanical impurity removal by an impurity remover.

3. The ultra-long term grain storage method according to claim 1, Features: In step S3, electromagnetic wave heating and drying of the grains is performed using electromagnetic drying technology.

4. The ultra-long term grain storage method according to claim 1, Features: In step S4, the grains are quickly frozen by using one of a push-type quick freezer, a spiral quick freezer and a lifting quick freezer, the quick freezing temperature is controlled below -30°C, and the freezing time is controlled within 60 minutes.

5. The ultra-long term grain storage method according to claim 1, Features: In step S5, a spiral vacuum barrel is used to perform vacuum freeze-drying on the grains. The grains move spirally in the spiral vacuum barrel and are freeze-dried. The pressure in the spiral vacuum barrel is controlled at 0.1-0.3 mbar.

6. The ultra-long term grain storage method according to claim 1, Features: In step S6, the ton box or vacuum packaging bag has a labeling and scanning function, and is automatically put into storage by scanning the code, and can be scanned and shipped out according to the outbound list; during the warehousing process, the code is manually labeled and scanned, and the ton box or vacuum packaging bag is transported to the stacking position in the vacant area by the AGV transporter, and the WMS warehouse management system controls the intelligent crane to hoist and stack it to the corresponding stacking position; during the outbound process, the number of pick-up is entered, and the WMS warehouse management system controls the intelligent crane and AGV transporter to move the stored grains to the outbound docking station, and the grains can be shipped out of the warehouse only after manual scanning.

7. The ultra-long term grain storage method according to claim 1, Features: After the grain is shipped out of the warehouse, there is also a rehydration and conditioning step to restore the moisture content of the grain through the rehydration and conditioning line.

8. An ultra-long-term grain storage production line, Features: The invention comprises a grain feeding tank (1), a physical impurity removal device (2), a sterilization device (3), a secondary dehydration and drying device (4), a quick freezing device (5), a vacuum freeze drying device (6), a docking station (7) and an AGV transport vehicle (8) which are arranged in sequence, wherein: The discharge port of the grain feeding tank (1) is connected to the feed port of the physical impurity removal device (2), and grains meeting the requirements are stored in the grain feeding tank (1); The physical impurity removal device (2) includes two parts: electrostatic adsorption impurity removal and impurity removal by a mechanical impurity remover. The grains move in the physical impurity removal device (2) toward the sterilization device (3). After secondary impurity removal by electrostatic adsorption and impurity removal by a mechanical impurity remover, the impurity content in the grains is reduced to less than 0.2%. The feed inlet of the sterilization device (3) is connected to the discharge outlet of the physical impurity removal device (2), and the sterilization device (3) has a photocatalyst sterilization mechanism, an electrostatic sterilization mechanism and an ultraviolet sterilization mechanism, and the photocatalyst sterilization mechanism, the electrostatic sterilization mechanism and the ultraviolet sterilization mechanism are used to sterilize the grains; The secondary dehydration and drying device (4) adopts an electromagnetic drying machine, and the feed inlet of the secondary dehydration and drying device (4) is connected with the discharge outlet of the sterilization device (3); The feed inlet of the quick freezing device (5) is connected to the discharge port of the secondary dehydration drying device (4), and the discharge port of the quick freezing device (5) is connected to the feed inlet of the vacuum freeze drying device (6); The vacuum freeze-drying device (6) comprises a spiral vacuum barrel, wherein the spiral vacuum barrel has a spiral conveying bin for conveying grains, and the discharge port of the spiral vacuum barrel has a packaging mechanism; The docking station (7) is arranged at the discharge end of the vacuum freeze-drying device (6), and the grains are packaged and stored in tote boxes (9) or vacuum packaging bags at the docking station (7); the AGV transport vehicle (8) is located at the end of the docking station (7) and is used to transport the tote boxes (9) or vacuum packaging bags containing the grains into a warehouse for stacking and storage.

9. The ultra-long-term grain storage production line according to claim 8, Features: The vacuum freeze-drying devices (6) are configured in two or more units, and the plurality of vacuum freeze-drying devices (6) are used in rotation according to production conditions to form an assembly line.

10. The ultra-long-term grain storage production line according to claim 8 or 9, Features: The ton box (9) is an Internet of Things ton box, which is formed by integral injection molding of plastic and a metal frame, and has a grain inlet, a grain outlet, a vacuum port and a sampling port. The ton box (9) also has a deoxidation drying chamber, a positioning and detection sensor, and an alarm. The vacuum packaging bag is made of PET+Al+PE+Ag and has a pressure-resistant layer.

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