Rice multi-stage cooling processing device and fresh locking technology thereof

Abstract

The invention discloses a rice multi-stage cooling processing device which comprises a raw material bin, a preliminary cleaning device, a stone-removing specific gravity machine, a rice huller, a secondary cleaning device, a husked rice separator, an emery roll rice mill, an iron roll rice mill, a white rice screening machine, a polishing machine and a color sorter, and an unpolished rice bin is arranged between the husked rice separator and the emery roll rice mill; the rice processing device is reasonable in structure and novel in design, materials such as impurities can be effectively removed in the processing process, the breakage rate of rice grains can be guaranteed, the rice yield is increased, air in the bin is continuously extracted through the air suction pipeline, heat in the rice grains is taken away, and the rice processing efficiency is improved. The rice is rapidly cooled, the purity and the quality stability of the rice are effectively improved, a raw material basis is provided for subsequent fine processing, the processing problem caused by too high temperature or magazine residues is reduced, and therefore the overall production efficiency and the product quality are improved.

Description

Technical Field

[0001] This invention relates to the field of rice processing technology, specifically to a multi-stage cooling processing device for rice and its freshness-locking process. Background Technology

[0002] Existing rice processing equipment has a high rate of broken rice and a large number of impurities in the finished rice. In the past, natural ventilation and cooling were not achieved in the processing technology, resulting in poor quality of finished rice. Summary of the Invention

[0003] To address the shortcomings of existing technologies, a multi-stage cooling processing device for rice is disclosed, comprising a raw material silo, a primary cleaning device, a destoning and gravity separator, a rice huller, a secondary cleaning device, a rice-brown rice separator, a sand roller rice mill, an iron roller rice mill, a white rice sieve, a polishing machine, and a color sorter. A brown rice silo is provided between the rice-brown rice separator and the sand roller rice mill, and a cooling rice silo is provided between the white rice sieve and the polishing machine. The color sorter is connected to a finished product silo.

[0004] Preferably, the brown rice silo is constructed with a steel plate body, and the top and sides of the silo body are provided with through holes for connecting to an external centrifugal fan, and the through holes are equipped with valves.

[0005] Preferably, the rice cooling bin is constructed with a lightweight steel frame, a screen is installed inside the bin, and a suction pipe connected to an external suction device is installed on the bin.

[0006] Preferably, the finished product silo is constructed with stainless steel plates, and a temperature and humidity sensor and a gas circulation system are installed inside the silo. The bottom of the silo has a conical structure, and a flow regulating valve and an electronic metering device are installed at the outlet of the silo.

[0007] Preferably, the screen includes a mounting frame, in which multiple mounting rods are arranged in a crisscross pattern, forming multiple cavities between the staggered mounting rods, and filter elements are disposed within the cavities.

[0008] Preferably, the filter element includes a top plate with filter holes, connecting plates are installed on the left and right sides of the lower wall of the top plate, and a clamping plate is installed at the lower end of the connecting plate.

[0009] Preferably, the upper end of the screen is provided with an anti-clogging structure, which includes multiple electric telescopic components located at the upper end of the screen. The electric telescopic components are installed on the upper wall of the rice cooling bin. A connecting plate is installed at the lower end of the electric telescopic components. Multiple rotating shafts are rotatably passed through the connecting plate. A drive motor is installed at the upper end of each rotating shaft. The drive motor is installed on the connecting plate. The lower end of the rotating shaft has a paddle structure.

[0010] A rice freshness-locking process, using the aforementioned rice processing device, includes the following steps: Step 1: Unloading raw materials from the silo Open the feed port of the raw material silo and send the raw material into the primary cleaning device; Step 2: Raw material cleaning The initial cleaning device filters out irregular objects through sieves, removing all large impurities; Step 3: Remove stones from raw materials Under the action of the destone gravity separator, rice grains are separated from stones, metals, etc. by their specific gravity. Step 4: Raw material rice husks The rice is hulled using a rice huller; Step 5: Rice-brown separation: The hulled grains are separated from the brown rice using a grain-brown rice separator; Step 6: Brown Rice Storage It can create a stable and uniform airflow field inside the warehouse. Under this environment, brown rice can exchange temperatures evenly in all parts, avoiding local overheating or overcooling, ensuring a consistent overall cooling effect, which is conducive to the standardized operation of subsequent processing procedures and improves the stability of product quality. Step 7: Grinding with sanding rollers and magnetic separation: The outer skin of brown rice is removed by a sand roller rice milling machine, and the iron in the cleaned brown rice is removed by a magnet inside the sand roller rice milling machine. Step 8: Whitening with iron rollers: The iron roller rice milling machine controls the precision of degerming and retention by using pressure rollers and electric current; Step 9: Grading of white rice: During the processing of white rice, some white rice is broken into broken rice and fragmented rice by using a white rice screening machine, which strictly grades the rice. Step 10: Cooling the rice in the granary: Used to store rice during processing, the aperture is customized according to the specifications of the semi-finished rice to be screened. It can effectively remove broken rice and impurities while ensuring that normal rice grains can pass through smoothly, forming a stable negative pressure environment. This creates a gentle and uniform negative pressure environment that guides the rice grains to roll and move in an orderly manner on the screen. By adjusting the inlet angle and wind speed of the suction pipe, the airflow can form an "air cushion layer" along the screen surface. When the rice grains roll on it, the friction and impact are controlled to a very small range. Step 11: Polishing process: Polish the rice; Step 12: Color sorting: Select the imperfect grains by sieving out the rice that is of poor quality after polishing.

[0011] The present invention has the following beneficial effects: The present invention has a reasonable structure and novel design. During the processing, it can effectively remove impurities and other materials while ensuring the rice grain breakage rate and increasing the rice yield. By continuously drawing air from the silo through the suction pipe, the heat in the rice grains is removed, which can quickly cool the rice and effectively improve the purity and quality stability of the rice. This provides a good raw material basis for subsequent fine processing and reduces processing problems caused by excessive temperature or impurity residue, thereby improving the overall production efficiency and product quality. Attached Figure Description

[0012] Figure 1 This is a schematic process flow diagram of the present invention; Figure 2 This is a schematic front view of the screen in the present invention. Figure 3 This is a schematic front view of the anti-blocking structure in this invention; Figure 4 This is a schematic side view of the anti-blocking structure in this invention.

[0013] In the diagram: 1-Raw material silo, 2-Primary cleaning device, 3-Destoning gravity machine, 4-Hulling machine, 5-Secondary cleaning device, 6-Rice-brown rice separator, 7-Sand roller rice milling machine, 8-Iron roller rice milling machine, 9-White rice screening machine, 10-Polishing machine, 11-Color sorter, 12-Brown rice silo, 13-Cooled rice silo, 14-Finished product silo, 15-Mounting frame, 16-Mounting rod, 17-Cavity, 18-Top plate, 19-Filter hole, 20-Connecting plate, 21-Clamping plate, 22-Electric telescopic component, 23-Connecting plate, 24-Rotating shaft, 25-Drive motor. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figure 1-4 A multi-stage cooling and processing device for rice includes a raw material silo 1, a primary cleaning device 2 (vibrating screen), a destoning and gravity separator 3, a rice huller 4, a secondary cleaning device 5 (vibrating screen), a rice-brown rice separator 6, a sand roller rice mill 7, an iron roller rice mill 8, a white rice screening machine 9, a polishing machine 10, and a color sorter 11. The above-mentioned equipment is commonly used in the field, and its specific structure and working principle will not be described in detail. The above-mentioned adjacent equipment are connected by a material conveyor belt for material transfer and transportation. A brown rice silo 12 is set between the rice-brown rice separator 6 and the sand roller rice mill 7, and a cooling rice silo 13 is set between the white rice screening machine 9 and the polishing machine 10. The color sorter 11 is connected to the finished product silo 14. During processing, the feed inlet of raw material silo 1 is opened, allowing the material inside to enter the primary cleaning device 2 under the action of the conveyor belt. The primary cleaning device 2 removes all large impurities. The material after impurity removal is then conveyed to the destoning and gravity separator 3, where the rice is separated from stones, metals, etc., by its specific gravity. The destoned material then enters the rice huller 4 under the action of the conveyor belt, where it is dehulled. The dehulled material then enters the secondary cleaning device 5 for further screening. After cleaning, the material enters the rice-brown rice separator 6, where the hulled rice (90% clean paddy) is separated from the brown rice. The material is then poured into the brown rice silo 12, where a stable and uniform airflow is created. In this environment, the brown rice experiences even temperature exchange throughout, preventing localized overheating or undercooling and ensuring consistent overall cooling. This facilitates standardized operation in subsequent processing steps and improves product quality stability. The material in the brown rice silo 12 is then transported to the sand roller rice mill 7 to remove the outer skin of the brown rice. The magnet in rice milling machine 7 removes iron from the material. The processed material enters iron roller rice milling machine 8, where the precision of degerming and retention is controlled by pressure and current. The material then enters white rice screening machine 9. During processing, some white rice becomes broken rice and fragmented rice, and the rice is strictly graded. The separated material enters rice cooling silo 13 to store the rice being processed. The aperture is customized according to the required specifications of the semi-finished rice to be screened. It can effectively remove broken rice and impurities while ensuring that normal rice grains can pass through smoothly, forming a stable negative pressure environment. This creates a soft and uniform negative pressure environment that guides the rice grains to roll and move orderly on the screen. By adjusting the inlet angle and wind speed of the suction pipe, the airflow can form an "air cushion layer" along the screen surface. When the rice grains roll on it, the friction and impact are controlled to a very small range. The screened material enters polishing machine 10 for polishing. The polished material is then screened out by color sorter 11. The qualified material enters finished product silo 14 for storage. The brown rice silo 12 is constructed with steel plates. The top and sides of the silo are equipped with through-holes that connect to an external centrifugal fan, and valves are installed at the through-holes. The brown rice bin 12 is constructed with steel plates to ensure that the bin has sufficient strength and stability to withstand the pressure generated by the accumulation of brown rice, while also having good sealing properties to prevent external impurities and moisture from entering. Ventilation and cooling are achieved by drawing air outwards. Ventilation openings are strategically placed on the top and sides of the chamber, connecting to external centrifugal fans to create directional airflow within the chamber. The ventilation openings are equipped with adjustable valves for precise control of ventilation volume and speed.

[0016] Protecting Brown Rice Quality: The robust steel silo structure effectively resists external interference, maintaining a stable internal environment. The outward air intake precisely controls the air pressure and flow rate within the silo, preventing excessively strong airflow from directly impacting or causing frictional damage to the brown rice. This ensures the integrity of the brown rice grains, reduces broken rice, and maximizes the preservation of the nutritional value and processing potential of the brown rice. Uniform cooling: This creates a stable and uniform airflow field within the storage area. In this environment, brown rice experiences uniform temperature exchange throughout, preventing localized overheating or undercooling, ensuring consistent overall cooling, facilitating standardized operations in subsequent processing steps, and improving product quality stability. Moisture and insect prevention: By controlling the outward air intake, the humidity inside the storage can be regulated, effectively preventing humid air from entering the storage and reducing the risk of brown rice becoming damp and moldy. At the same time, the stable airflow environment is also not conducive to the breeding and reproduction of pests, providing a relatively safe space for brown rice storage and reducing grain loss and quality decline caused by pests.

[0017] Adapting to the characteristics of brown rice: Considering the characteristics and processing requirements of brown rice in the early stages of processing, steel silos and external air intake methods are better suited to it. Brown rice needs a certain amount of time to temper and balance internal stress at this stage. This gentle cooling and ventilation method helps brown rice complete internal structural adjustments in a stable environment, laying a good foundation for subsequent processing steps and improving the efficiency and product quality of the entire processing flow. The Liangmi Cang 13 uses a lightweight steel structure for its canopy body, which is equipped with a screen and has suction pipes that connect to external suction equipment. The structure combines a screen and a suction duct. The silo frame is made of lightweight steel to ensure the overall structure is stable and easy to install and maintain. The screen is made of stainless steel and the aperture is customized according to the specifications of the semi-finished rice to be screened. It can effectively remove broken rice and impurities while ensuring that normal rice grains can pass through smoothly. The suction duct is reasonably laid out inside the silo and connects to the external suction equipment to form a stable negative pressure environment. Reasonable airflow control: In the design, parameters such as the air force of the suction duct, the aperture of the screen, and the vibration frequency of the screen are carefully calculated and adjusted. It is not a simple direct airflow, but a gentle and uniform negative pressure environment is formed to guide the rice grains to roll and move in an orderly manner on the screen. By adjusting the inlet angle and wind speed of the suction duct, the airflow can form a "cushion layer" along the screen surface. When the rice grains roll on it, the friction and impact are controlled within a very small range. Screen characteristics and adaptation: The selected screen material has a certain degree of flexibility and smoothness, which can effectively reduce the damage caused by direct collision between rice grains and the screen surface. At the same time, the screen aperture is of moderate size, which can effectively remove impurities and broken rice from the rice grains without causing normal rice grains to be excessively squeezed or stuck when passing through. For different varieties and processing precision of rice, screens with specific aperture specifications will be selected to ensure that the integrity of the finished rice is protected to the greatest extent during the screening process. Dynamic Balance and Buffering: The internal structure of the entire rice cooling bin is designed with a focus on the dynamic balance of rice grains during their movement on the screen. By optimizing the layout of the suction pipes and the installation angle of the screen, the rice grains remain in a relatively stable state of motion under the influence of gravity, wind force, and screen friction, preventing breakage caused by sudden acceleration, deceleration, or turning. A special airflow buffer device is installed below the screen to effectively absorb the impact force when rice grains fall, further reducing the risk of breakage. During the cooling process, air is continuously drawn from the storage chamber through the suction pipes to remove the heat generated by the rice grains during processing, thereby rapidly cooling the semi-finished rice. At the same time, impurities such as rice bran and dust are adsorbed and discharged outside the storage chamber, effectively improving the purity and quality stability of the semi-finished rice. This provides a high-quality raw material base for subsequent fine processing, reduces processing problems caused by excessively high temperatures or impurity residues, and improves overall production efficiency and product quality. The finished product silo 14 is constructed with stainless steel plates. Temperature and humidity sensors and a gas circulation system are installed inside the silo. The bottom of the silo is a conical structure, and a flow regulating valve and an electronic metering device are installed at the silo outlet. The silo body is constructed with food-grade stainless steel plates, with a thickness of 3-5mm, ensuring the silo body is sturdy, durable, hygienic, and safe. The welded parts of the silo body are finely processed to ensure no gaps or leaks, effectively preventing external dust, bacteria, and moisture from entering the silo body and ensuring that the quality of the finished white rice is not contaminated. The silo door is a double-layer stainless steel door with good sealing performance, equipped with sealing strips and locking devices to further enhance the airtightness of the silo body. Temperature and humidity control: High-precision temperature and humidity sensors are installed inside the storage chamber to monitor the temperature and humidity of the environment in real time. Through an automated control system, the temperature is generally controlled at 18-25℃ and the humidity is controlled at 50%-70% according to the preset temperature and humidity range. This automatically adjusts the environment inside the storage chamber to ensure that the finished rice is stored under suitable conditions and to prevent problems such as rice deterioration, mold growth or poor taste caused by improper temperature and humidity. Gas composition regulation: The gas circulation system ensures a uniform distribution of gas composition within the storage chamber, maintaining a stable storage environment. Discharge and Packaging Connection Design: The bottom of the finished product silo is designed with a conical structure with a cone angle of 60°, which facilitates the smooth discharge of rice under gravity. The discharge port is equipped with a flow regulating valve and a high-precision electronic metering device, which is closely connected to the downstream packaging production line. This design can accurately control the discharge flow and packaging weight, ensuring that the weight of each bag of finished rice meets the standard requirements, improving packaging efficiency and the stability of product packaging quality, meeting the market demand for high-quality finished rice packaging and sales, and enhancing the company's market competitiveness and brand image. The screen includes a mounting frame 15, and multiple mounting rods 16 are arranged in a crisscross pattern inside the mounting frame 15. Multiple cavities 17 are formed between the crisscrossing mounting rods 16. Filter elements are installed in the cavities 17. The filter elements include a top plate 18, on which filter holes 19 are opened. Connecting plates 20 are installed on the left and right sides of the lower wall of the top plate 18, and a clamping plate 21 is installed at the lower end of the connecting plate 20. Mounting bracket 15, top plate 18, connecting plate 20 and connecting plate 20 are made of iron, which can be bent slightly under stress and reset when stress is released. The filter holes 19 of the screen can be replaced individually, reducing the cost of screen maintenance. When replacing the filter holes 19, press the connecting plate 20 inward to bring the connecting plates 20 closer together, and place the top plate 18 against the mounting rod 16. When the clamping plate 21 is moved out of the cavity 17, the clamping plate 21 resets and clamps at the lower end of the mounting rod 16 to fix the filter holes 19 and complete the replacement. An anti-clogging structure is provided at the upper end of the screen. The anti-clogging structure includes multiple electric telescopic components 22 located at the upper end of the screen. The electric telescopic components 22 are arranged perpendicular to the material movement direction. The electric telescopic components 22 are installed on the upper wall of the rice cooling bin 13. A connecting plate 23 is installed at the lower end of the electric telescopic components 22. Multiple rotating shafts 24 are rotatably passed through the connecting plate 20. A drive motor 25 is installed at the upper end of each rotating shaft 24. The drive motor 25 is installed on the connecting plate 20. The lower end of the rotating shaft 24 is a paddle structure. The length of the connecting plate 20 is parallel to the material movement direction to prevent material from moving on the screen when the rotating shaft 24 moves downward. During unclogging, the electric telescopic component 22 is activated in sequence. The electric telescopic component 22 moves downward, causing the connecting plate 20 to move downward, thereby causing the rotating shaft 24 to move downward. When the rotating shaft 24 moves downward, the drive motor 25 is activated. The drive motor 25 drives the rotating shaft 24 to rotate. Since the lower end of the rotating shaft 24 has a paddle structure, the material at the lower end of the rotating shaft 24 can be flexibly moved to the side when the rotating shaft 24 rotates, preventing the material at the lower end of the rotating shaft 24 from being pushed into the filter hole 19 and damaging the filter hole 19. As the rotating shaft 24 moves downward, the material stuck in the filter hole 19 can be pushed out, preventing the filter hole 19 from becoming clogged.

[0018] A rice freshness-locking process, comprising the following steps: Step 1: Unloading raw materials from the silo Open the feed port of the raw material silo and send the raw material into the primary cleaning device 2; Step 2: Raw material cleaning After the initial cleaning device 2 filters irregular objects through sieves, all large impurities are removed; Step 3: Remove stones from raw materials Under the action of the destone gravity separator 3, the rice grains are separated from stones, metals, etc. by their specific gravity. Step 4: Raw material rice husks The rice is hulled using a rice huller. Step 5: Rice-brown separation: After being hulled in six passes by a grain-brown rice separator, 90% of the clean grains and brown rice are separated. Step 6: Brown Rice Storage It can create a stable and uniform airflow field inside the warehouse. Under this environment, brown rice can exchange temperatures evenly in all parts, avoiding local overheating or overcooling, ensuring a consistent overall cooling effect, which is conducive to the standardized operation of subsequent processing procedures and improves the stability of product quality. Step 7: Grinding with sanding rollers and magnetic separation: The outer skin of brown rice is removed by the sand roller rice milling machine 7, and the iron in the clean brown rice is removed by the magnet in the sand roller rice milling machine 7. Step 8: Whitening with iron rollers: The iron roller rice milling machine 8 controls the precision of degerming and retention by using pressure rollers and electric current; Step 9: Grading of white rice: During the processing of rice, some of the white rice is broken into broken rice and fragmented rice by the white rice screening machine 9, which strictly grades the rice. Step 10: Cooling the rice in the granary: Used to store rice during processing, the aperture is customized according to the specifications of the semi-finished rice to be screened. It can effectively remove broken rice and impurities while ensuring that normal rice grains can pass through smoothly, forming a stable negative pressure environment. This creates a gentle and uniform negative pressure environment that guides the rice grains to roll and move in an orderly manner on the screen. By adjusting the inlet angle and wind speed of the suction pipe, the airflow can form an "air cushion layer" along the screen surface. When the rice grains roll on it, the friction and impact are controlled to a very small range. Step 11: Polishing process: Polish the rice; Step 12: Color sorting: Select the imperfect grains by sieving out the rice that is of poor quality after polishing.

[0019] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0020] In the description of this solution, it should be noted that, unless otherwise explicitly specified and limited, the terms 'installation,' 'connection,' 'linking,' and 'communication' should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components; and they can refer to wireless connections or wired connections. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage cooling and processing device for rice, comprising a raw material silo (1), a primary cleaning device (2), a destoning and gravity separator (3), a rice huller (4), a secondary cleaning device (5), a paddy rice separator (6), a sand roller rice mill (7), an iron roller rice mill (8), a white rice sieve (9), a polishing machine (10), and a color sorter (11), characterized in that, A brown rice bin (12) is provided between the rice separator (6) and the sand roller rice milling machine (7), a rice cooling bin (13) is provided between the white rice sieve (9) and the polishing machine (10), and a finished product bin (14) is connected after the color sorter (11).

2. The rice multi-stage cooling processing device according to claim 1, characterized in that, The brown rice silo (12) is constructed with steel plates. The top and sides of the silo are provided with through holes for connecting to an external centrifugal fan, and valves are installed in the through holes.

3. The multi-stage cooling device for rice according to claim 1, wherein The rice storage bin (13) is constructed with lightweight steel, and a screen is installed inside the bin. The bin is also equipped with suction pipes that connect to external suction equipment.

4. The multi-stage cooling device for rice according to claim 1, wherein The finished product silo (14) is constructed with stainless steel plates. Temperature and humidity sensors and a gas circulation system are installed inside the silo. The bottom of the silo is a conical structure. A flow regulating valve and an electronic metering device are installed at the outlet of the silo.

5. The multi-stage rice cooling processing device according to claim 3, characterized in that, The screen includes a mounting frame (15), in which multiple mounting rods (16) are arranged in a crisscross pattern, and multiple cavities (17) are formed between the crisscrossed mounting rods (16), and filter elements are arranged in the cavities (17).

6. The multi-stage rice cooling processing device according to claim 5, characterized in that, The filter element includes a top plate (18), on which filter holes (19) are provided. Connecting plates (20) are installed on the left and right sides of the lower wall of the top plate (18), and a clamping plate (21) is installed at the lower end of the connecting plate (20).

7. The multi-stage rice cooling processing device according to claim 6, characterized in that, The upper end of the screen is provided with an anti-clogging structure, which includes multiple electric telescopic components (22) located at the upper end of the screen. The electric telescopic components (22) are installed on the upper wall of the rice cooling bin (13). A connecting plate (23) is installed at the lower end of the electric telescopic components (22). Multiple rotating shafts (24) are rotatably passed through the connecting plate (20). A drive motor (25) is installed at the upper end of each rotating shaft (24). The drive motor (25) is installed on the connecting plate (20). The lower end of the rotating shaft (24) is a paddle structure.

8. A rice fresh-locking process, characterized by, The method uses the rice processing apparatus according to any one of claims 1-7, and includes the following steps: Step 1: Unloading raw materials from the silo Open the feed port of the raw material silo and send the raw material into the primary cleaning device (2); Step 2: Raw material cleaning After the initial cleaning device (2) filters the irregular objects through the sieve plate to remove all the large impurities; Step 3: Remove stones from raw materials Under the action of the destone gravity separator (3), the rice grains are separated from stones, metals and other materials by their specific gravity. Step 4: Raw material rice husks The rice is dehulled using a rice huller (4); Step 5: Separation of rice and husk: The hulled rice and brown rice are separated by a grain separator (6); Step 6: Brown Rice Storage It can create a stable and uniform airflow field inside the warehouse. Under this environment, brown rice can exchange temperatures evenly in all parts, avoiding local overheating or overcooling, ensuring a consistent overall cooling effect, which is conducive to the standardized operation of subsequent processing procedures and improves the stability of product quality. Step 7: Grinding with sanding rollers and magnetic separation: The outer skin of brown rice is removed by a sand roller rice milling machine (7), and the iron in the clean brown rice is removed by a magnet in the sand roller rice milling machine (7). Step 8: Whitening with iron rollers: The iron roller rice mill (8) controls the precision of degerming and retention by using a pressure roller and an electric current; Step 9: Grading of white rice: During the processing of rice by a white rice sieve (9), some white rice is broken into broken rice and fragmented rice, and the rice is strictly graded. Step 10: Cooling the rice in the granary: Used to store rice during processing, the aperture is customized according to the specifications of the semi-finished rice to be screened. It can effectively remove broken rice and impurities while ensuring that normal rice grains can pass through smoothly, forming a stable negative pressure environment. This creates a gentle and uniform negative pressure environment that guides the rice grains to roll and move in an orderly manner on the screen. By adjusting the inlet angle and wind speed of the suction pipe, the airflow can form a "cushion layer" along the screen surface. When the rice grains roll on it, the friction and impact are controlled to a very small range. Step 11: Polishing process: Polish the rice; Step 12: Color sorting: Select the imperfect grains by sieving out the rice that is of poor quality after polishing.

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