A rice surface polishing device for rice processing

Abstract

The present application relates to rice polishing technical field, the present application provides a rice surface polishing device for rice processing, including the impurity removal box and polishing box installed on the rack, the feed inlet of impurity removal box and the discharge end of polishing box are respectively installed with feed hopper and discharge port, and the discharge end of impurity removal box and the feed end of polishing box are connected through the feed pipe, the polishing roller and spiral auger of coaxial connection are rotatably installed in the inside of polishing box.The present application avoids the rigid friction of dry polishing, reduces the broken rice rate, greatly reduces the contact of water and rice, rice bran, effectively controls the moisture content of rice, avoids the overproof of water spraying, and can also reduce the moisture content of rice bran, effectively prevents the risk of screen hole blockage and mildew, without additional drying process, reduces energy consumption and cost, solves the technical problems of high moisture of rice bran, overproof of moisture content of rice, easy mildew, high broken rice rate of dry polishing caused by water spraying polishing in the prior art.

Description

Technical Field

[0001] This invention relates to the field of rice polishing technology, specifically to a rice surface polishing device for rice processing. Background Technology

[0002] In the polishing process of rice processing, traditional equipment typically uses water-spray polishing—by spraying atomized water onto the contact area between the polishing roller and the rice, the lubrication of the water film reduces frictional damage to the rice grain surface and removes surface bran. However, this method has two major problems: 1. Damp rice bran clogging the sieve holes: When the rice bran produced during polishing is mixed with water mist, the moisture is absorbed by the rice bran fibers, resulting in a significant increase in the moisture content of the rice bran (the moisture content can reach 15%~20%). When the damp rice bran is separated by a vibrating sieve or a negative pressure sieve, it is very easy to stick to the surface of the sieve holes or stick together to form clumps, causing sieve blockage and seriously affecting the screening efficiency and rice bran removal effect. 2. Excessive moisture content in rice: Excessive water vapor adheres to the surface of rice (the moisture content of rice may rise from the standard range of 14%~16% to 17%~19%), which not only does not meet the safe moisture standards for grain storage (making it prone to mold), but also requires an additional drying process, leading to increased processing energy consumption and costs.

[0003] Some current rice polishing equipment attempts to solve the moisture content problem by "adding a drying module" or "setting a water-absorbing roller in the polishing stage", but none of them reduce the contact between water mist and rice bran from the source. In addition, the drying module increases the complexity of the equipment and energy consumption, and the water-absorbing roller has limited effect on separating the already stuck damp rice bran. To reduce the impact of water mist, some polishing devices use dry polishing (without water spraying). However, in this case, there is no lubrication between the polishing roller and the rice grains, resulting in a direct rigid collision (especially when the rice grains come into contact with the surface of the high-speed rotating metal polishing roller). This can easily cause cracks or even breakage on the surface of the rice grains. Statistics show that the broken rice rate of dry polishing is 15% to 25% higher than that of conventional water-spraying polishing, which seriously affects the quality and commercial value of rice.

[0004] To address the aforementioned problems, this application proposes a rice surface polishing device for rice processing. Summary of the Invention

[0005] To overcome the above-mentioned defects, embodiments of the present invention provide a rice surface polishing device for rice processing, which solves the technical problems of high rice bran humidity, excessive rice moisture content and easy mold growth, and high broken rice rate in the prior art caused by water spray polishing.

[0006] According to one aspect, at least one embodiment of the present invention provides a rice surface polishing device for rice processing, comprising a cleaning box and a polishing box mounted on a frame. The feeding end of the cleaning box and the discharging end of the polishing box are respectively equipped with a feeding hopper and a discharging port, and the discharging end of the cleaning box and the feeding end of the polishing box are connected by a conveying pipe. A polishing roller and a spiral auger are rotatably mounted inside the polishing box and are coaxially connected. The input end of the spiral auger is driven to rotate by a driving device. A separating screen is mounted on the lower end face of the polishing box. A water tank extending into its inner cavity and opposite to the outer peripheral surface of the polishing roller is mounted on the upper end face of the polishing box. A plurality of water film generators linearly and evenly distributed along the axis of the polishing roller are mounted on the lower end of the water tank. The outer peripheral surface of the polishing roller has a plurality of evenly distributed hemispherical protrusions, and the hemispherical protrusions intermittently trigger the water film generators as the polishing roller rotates, so that the water film generators form a lubricating water film on the surface of the hemispherical protrusions.

[0007] For example, at least one embodiment of the present invention provides a rice surface polishing device for rice processing, wherein the water film generator includes a fixed tube installed at the lower end of a water tank, a movable tube is fitted inside the fixed tube through an axial sliding seal, the lower end of the movable tube extends to the bottom of the water tank and is fitted with a water outlet opposite to the polishing roller, a sealing plug for sealing the upper end opening of the fixed tube is installed at the upper end of the movable tube, a water inlet is provided on the outer periphery of the upper end of the movable tube, and the water inlet is connected to the water inlet end of the water outlet through the inner cavity of the movable tube, and a spring is also fitted on the movable tube and fixed between the fixed tube and the water outlet.

[0008] For example, in at least one embodiment of the present invention, the rice surface polishing device for rice processing has an L-shaped cross-section for the water inlet. The long side of the L-shaped channel is open on the outside and is vertically arranged along the upper outer periphery of the movable tube. The short side of the L-shaped channel is connected to the inner cavity of the movable tube. The rotation of the polishing roller causes the hemispherical protrusion to intermittently push the water outlet upward, so that the sealing plug moves upward and separates from the upper end of the fixed tube to form a water inlet gap. The upper end of the movable tube causes the water inlet to extend into the water inlet gap, so that the water in the water tank enters the movable tube through the water inlet and is coated on the surface of the hemispherical protrusion through the water outlet. The upper end of the polishing box has an assembly hole that matches the water tank. The water tank is slidably assembled in the assembly hole. The upper end of the water tank extends to the top of the polishing box and is equipped with a connecting plate. The connecting plate is slidably assembled with the frame and its height can be adjusted by a lifting device to adjust the distance between the water film generator and the polishing roller. This adjusts the height at which the hemispherical protrusion lifts the water film generator, thereby adjusting the upward movement height of the movable tube. It can also adjust the length of the water inlet hole entering the water inlet gap, making it convenient to adjust the water output according to the actual situation.

[0009] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein the inner wall of the upper opening of the fixed tube has a sealing groove, and a sealing element fitted on the upper end of the movable tube is installed on the lower end face of the sealing plug. The sealing element and the sealing groove are a conical sealing structure that is adapted to each other, thereby forming a conical seal.

[0010] For example, the rice surface polishing device for rice processing provided in at least one embodiment of the present invention includes a water outlet including a water outlet seat installed at the lower end of a movable tube. The lower end face of the water outlet seat has a spherical groove adapted to the hemispherical protrusion, and a plurality of nozzles are installed on the inner wall of the spherical groove. The interior of the water outlet seat has a water flow channel. The inlet end of the water flow channel is connected to the inner cavity of the lower end of the movable tube. The water flow channel has a plurality of outlet ends, and the plurality of outlet ends correspond to and are connected to the plurality of nozzles.

[0011] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein the water channel is arc-shaped and concentrically arranged with the spherical groove, and multiple nozzles are arranged in an arc on the top wall of the spherical groove and connected to the water channel.

[0012] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein multiple hemispherical protrusions are divided into multiple groups, and the multiple groups of hemispherical protrusions are evenly distributed circumferentially on the outer wall of the polishing roller. Each group of multiple hemispherical protrusions is evenly distributed along the length direction of the polishing roller, and adjacent groups of hemispherical protrusions are staggered.

[0013] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein a scraper is installed on the side wall of the polishing box, the front end of the scraper extends obliquely upward and is in contact with the outer wall of the polishing roller, and a semi-circular groove adapted to and corresponding to the hemispherical protrusion is opened at the front end of the scraper, and a movable plate that can retract into the scraper is provided in the semi-circular groove. When the polishing roller rotates and drives the hemispherical protrusion to contact the movable plate, the movable plate retracts into the scraper until the hemispherical protrusion passes through the semi-circular groove, and the water film on the outer wall of the polishing roller and the surface of the hemispherical protrusion is evenly spread through the front end face of the scraper and the semi-circular groove respectively.

[0014] For example, the rice surface polishing device for rice processing provided in at least one embodiment of the present invention includes a scraper body installed on the side wall of the polishing box. The front end of the scraper body is provided with a telescopic cavity adapted to the movable plate. A semi-circular groove is provided at the front end opening of the telescopic cavity and runs vertically through it. The movable plate is slidably assembled in the telescopic cavity and is connected to the rear end inner wall of the telescopic cavity through an elastic element. The side wall of the polishing box has a drain outlet located above the end of the separating screen. The scraper body is installed on the bottom surface of the drain outlet with a gap between it and the top surface. Baffles are installed on both sides of the scraper body. The baffles are located on the outer sides of both ends of the polishing roller and protrude to the upper surface of the scraper body to form a guide groove. The tail end of the scraper body extends to the outside of the polishing box and is connected to the water storage equipment. Water is drawn from the water storage equipment by a water pump and transported to the water inlet at the top of the water tank. The water tank has a water level viewing window for timely water addition.

[0015] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein an air inlet pipe is installed on one end face of the impurity removal box near the feed hopper, and a fan is installed inside the air inlet pipe via a mounting bracket; an exhaust pipe connected to a dust collection device is installed on the other end face of the impurity removal box, and the exhaust pipe is connected to the upper part of the polishing box via a bracket; a spiral blade is installed inside the impurity removal box between the exhaust pipe and the air inlet pipe, one end of the spiral blade is fixed to the rotating shaft end of the fan, and the other end of the spiral blade is rotatably connected via a stabilizer installed in the end opening of the exhaust pipe; the axes of the impurity removal box, the spiral blade, the fan, the exhaust pipe, and the air inlet pipe coincide, thereby forming a dust removal duct connecting the exhaust pipe and the air inlet pipe in the central channel of the spiral blade.

[0016] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein a rice bran collection box is provided at the bottom of the frame below the separating screen, and a cleaning brush for unblocking the screen holes is installed on the outer surface of the separating screen, and the cleaning brush is driven by a driving component to reciprocate along the length direction of the separating screen. The drive component is preferably a reciprocating screw structure driven by a motor. The separating screen is an arc-shaped sheet screen, and the cleaning brush is an arc shape adapted to the separating screen. Movable blocks are installed at both ends of the cleaning brush. The reciprocating screw is installed on one side of the outer wall of the polishing box, and a guide rod parallel to the reciprocating screw is installed on the other side of the outer wall of the polishing box. One of the movable blocks of the separating screen is fixed to the movable end of the reciprocating screw, and the other movable block is slidably assembled with the guide rod.

[0017] The beneficial effects of this invention are as follows: (i) The problem is solved at the source by the synergistic structure of "polishing roller + water film generator": When the hemispherical protrusion on the outer periphery of the polishing roller rotates with the roller body, the water film generator is intermittently triggered. A lubricating water film is formed only on the surface of the protrusion in the non-contact area of ​​the polishing roller (the upper half of the roller, the rotation path that does not contact the rice grains), instead of spraying water into the area where the rice and the roller are in contact. The water film is brought into the polishing area by the rotation of the roller to achieve lubrication. This avoids the rigid friction of dry polishing, reduces the broken rice rate, and greatly reduces the contact between water and rice and rice bran, thereby effectively controlling the moisture content of rice and avoiding excessive water spraying. It can also reduce the moisture content of rice bran, effectively prevent the risk of sieve blockage and mold growth, and eliminate the need for an additional drying process, reducing energy consumption and cost. This solves the technical problems of high rice bran humidity, excessive rice moisture content and easy mold growth, and high broken rice rate in the existing technology caused by water spray polishing. (II) The water film generator achieves precise water control through "movable tube + spring + sealing plug": When the hemispherical protrusion lifts the water outlet, the movable tube moves upward to open the water inlet, and the water in the tank is accurately delivered to the protruding surface; when not triggered, the sealing plug seals the fixed tube to prevent ineffective water leakage. At the same time, the water tank is slidably assembled with the frame through the connecting plate, and the distance between it and the polishing roller can be adjusted by the lifting device to control the water output, so as to adapt to rice with different hardness such as indica rice and japonica rice. For example, when processing fragile indica rice, the water film thickness can be reduced to avoid excessive wetting, and when processing hard japonica rice, the water volume can be appropriately increased to improve the polishing effect. The adaptability is greatly improved compared with the traditional fixed water spray device. (iii) The front end of the scraper on the side wall of the polishing box is in contact with the outer wall of the polishing roller. The semi-circular groove is matched with the hemispherical protrusion. The movable plate can retract as the protrusion passes through, which not only prevents the scraper from scratching the protrusion, but also wipes the excess water on the surface of the protrusion evenly through the semi-circular groove, ensuring that the water film thickness of each protrusion is consistent. It can also wipe the water dripping onto the outer wall of the polishing roller evenly. Moreover, the baffles on both sides of the scraper form a guide channel, and the excess water is recycled to the water storage equipment through the drain outlet for reuse, further reducing water waste and preventing water from remaining on the surface of the rice. The moisture content is controlled again from the rear end. (iv) The impurity removal box forms a dust removal air duct through a fan and spiral blades to remove surface bran before the rice enters the polishing box, thereby reducing the amount of rice bran generated during the subsequent polishing process and reducing the burden on the separation screen. The cleaning brush under the separation screen is driven by a reciprocating screw and moves back and forth along the arc-shaped screen surface to unclog the screen holes in real time, reduce the screen hole blockage rate, and help improve the screening efficiency. The rice bran collection box can conveniently recycle rice bran and realize the secondary utilization of resources. (v) The hemispherical protrusions are divided into multiple groups of circumferentially evenly distributed and adjacent groups are staggered. This design allows the rice to be "contacted in all directions without dead angles" in the polishing box. When the spiral auger transports the rice, the staggered protrusions can polish the rice grains at different angles, avoiding the problem of "partial unpolished" caused by traditional single-direction protrusions. It can also be adapted to the unique design of the water film generator. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a rice surface polishing device for rice processing in one embodiment of the present invention; Figure 2 For the present invention Figure 1 A front sectional view of the impurity removal box; Figure 3 For the present invention Figure 1 A schematic diagram of the front cross-sectional structure of the intermediate grinding box; Figure 4 For the present invention Figure 3 A partial cross-sectional view of the lower part of the intermediate water tank; Figure 5 For the present invention Figure 4 A cross-sectional schematic diagram of a greywater film generator; Figure 6 For the present invention Figure 1 A side sectional view of the intermediate grinding box; Figure 7 For the present invention Figure 6 A top view of the middle scraper structure; Figure 8 For the present invention Figure 7 A partial cross-sectional structural diagram of the middle scraper.

[0020] In the diagram: 1. Impurity removal box; 2. Grinding box; 3. Feed hopper; 4. Discharge port; 5. Conveying pipe; 6. Spiral blades; 7. Fan; 8. Exhaust pipe; 9. Inlet pipe; 10. Support frame; 11. Grinding roller; 111. Hemispherical protrusion; 12. Spiral auger; 13. Separating screen; 14. Water tank; 15. Water film generator; 151. Fixed pipe; 152. Movable pipe; 153. Water outlet; 1531. Water outlet base; 153 2. Spherical groove; 1533. Nozzle; 1534. Water channel; 154. Sealing plug; 155. Spring; 156. Water inlet; 157. Seal; 158. Sealing groove; 16. Connecting plate; 17. Drain outlet; 18. Scraper; 181. Scraper body; 182. Movable plate; 183. Telescopic cavity; 184. Semicircular groove; 19. Rice bran collection box; 20. Cleaning brush; 21. Drive component; 22. Frame. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0022] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0023] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0026] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] like Figures 1-8The diagram illustrates a rice surface polishing device for rice processing according to an embodiment of this disclosure. It includes a cleaning box 1 and a polishing box 2 mounted on a frame 22. A feed hopper 3 and a discharge port 4 are respectively installed at the feed end of the cleaning box 1 and the discharge end of the polishing box 2. The discharge end of the cleaning box 1 and the feed end of the polishing box 2 are connected by a conveying pipe 5. A polishing roller 11 and a spiral auger 12 are rotatably mounted coaxially inside the polishing box 2. The input end of the spiral auger 12 is driven to rotate by a driving device. A separation screen 13 is installed on the lower end face of the polishing box 2, and a water tank 14 is installed on the upper end face of the polishing box 2, extending into its inner cavity and facing the outer peripheral surface of the polishing roller 11. Multiple water film generators 15 are linearly and evenly distributed along the axial direction of the polishing roller 11 at the lower end of the water tank 14. Multiple hemispherical protrusions 111 are evenly distributed on the outer peripheral surface of the polishing roller 11, and the hemispherical protrusions 111 intermittently trigger the water film generators 15 as the polishing roller 11 rotates, so that the water film generators 15 form a lubricating water film on the surface of the hemispherical protrusions 111. To address the problems of damp rice bran clogging the sieve holes and excessive rice moisture content in traditional water-jet polishing, this device optimizes the process through "precise water film lubrication + pre-removal of impurities." The polishing roller 11 and the auger 12 rotate coaxially. When the auger conveys rice, the hemispherical protrusion 111 intermittently triggers the water film generator 15, forming a thin water film of 5-10 μm thickness only on the surface of the protrusion. This film is carried into the polishing zone by the roller for lubrication, preventing direct contact between water and rice or rice bran. The separating sieve 13 separates the rice bran, and the pre-removal box 1 removes floating bran, significantly reducing the sieve clogging rate. This allows the rice moisture content to be controlled within a safe range of 14%-16%, eliminating the need for an additional drying process.

[0028] Specifically, such as Figures 3-5 As shown, the water film generator 15 includes a fixed tube 151 installed at the lower end of the water tank 14. A movable tube 152 is fitted inside the fixed tube 151 through an axial sliding seal. The lower end of the movable tube 152 extends to the lower part of the water tank 14 and is fitted with a water outlet 153 opposite to the polishing roller 11. A sealing plug 154 for sealing the upper end opening of the fixed tube 151 is installed at the upper end of the movable tube 152. A water inlet hole 156 is opened on the outer periphery of the upper end of the movable tube 152, and the water inlet hole 156 is connected to the water inlet end of the water outlet 153 through the inner cavity of the movable tube 152. A spring 155 is also fitted on the movable tube 152 and fixed between the fixed tube 151 and the water outlet 153. The water film generator achieves precise water control through "mechanical triggering + elastic reset": when the hemispherical protrusion 111 lifts the water outlet 153, the movable tube 152 moves upward by 2-5mm, the sealing plug 154 disengages from the fixed tube 151, the water inlet 156 is opened, and the water in the water tank 14 is transported to the water outlet through the movable tube. After the protrusion leaves, the spring 155 drives the movable tube to reset, the sealing plug seals the fixed tube to prevent ineffective water leakage, and the axial sliding seal ensures that there is no leakage when the movable tube slides.

[0029] Furthermore, such as Figure 5 As shown, the cross-section of the water inlet 156 is L-shaped. The outer side of the long side of the L-shaped channel is open and vertically arranged along the outer periphery of the upper end of the movable tube 152. The short side of the L-shaped channel is connected to the inner cavity of the movable tube 152. The rotation of the polishing roller 11 drives the hemispherical protrusion 111 to intermittently push the water outlet 153 upward, so that the sealing plug 154 moves upward and separates from the upper end of the fixed tube 151 to form a water inlet gap. The upper end of the movable tube 152 drives the water inlet 156 to extend into the water inlet gap, so that the water in the water tank 14 enters the movable tube 152 through the water inlet 156 and is coated on the surface of the hemispherical protrusion 111 through the water outlet 153. The L-shaped water inlet 156 ensures precise water flow when the moving tube moves upward. The water inlet gap controls the water volume to avoid over-watering. The water film is only coated on the hemispherical raised surface and comes into contact with the rice as the polishing roller rotates. The lubrication effect is better than traditional water spraying, which helps to reduce the broken rice rate from 15%-25% to below 5%.

[0030] Furthermore, the upper end of the polishing box is provided with an assembly hole that matches the water tank. The water tank is slidably assembled in the assembly hole. The upper end of the water tank extends to the top of the polishing box and is equipped with a connecting plate. The connecting plate is slidably assembled with the frame and its height is adjusted by a lifting device to adjust the distance between the water film generator and the polishing roller, thereby adjusting the height at which the hemispherical protrusion lifts the water film generator upward, and thus adjusting the upward movement height of the movable tube. It can also adjust the length of the water inlet hole entering the water inlet gap, making it convenient to adjust the water output according to the actual situation.

[0031] Furthermore, such as Figure 5 As shown, the upper opening of the fixed tube 151 has a sealing groove 158 on its inner wall, and a sealing element 157 fitted on the lower end face of the sealing plug 154 is installed on the upper end of the movable tube 152. The sealing element 157 and the sealing groove 158 are a conical sealing structure that is compatible with each other, thereby forming a conical seal. The sealing element 157 of the conical sealing structure is made of silicone material and fits tightly with the sealing groove 158. The sealing pressure is ≥0.5MPa, ensuring no water leakage when not triggered. The conical design facilitates automatic centering when the moving tube is reset, and the sealing reliability is greatly improved compared with the flat seal, which is suitable for long-term high-frequency triggering.

[0032] Furthermore, such as Figure 5As shown, the water outlet 153 includes a water outlet seat 1531 installed at the lower end of the movable tube 152. The lower end face of the water outlet seat 1531 is provided with a spherical groove 1532 that is adapted to the hemispherical protrusion 111. Multiple nozzles 1533 are installed on the inner wall of the spherical groove 1532. The interior of the water outlet seat 1531 has a water flow channel 1534. The inlet end of the water flow channel 1534 is connected to the inner cavity of the lower end of the movable tube 152. The water flow channel 1534 has multiple outlet ends, and the multiple outlet ends correspond to and are connected to the multiple nozzles 1533 one by one. The radius of curvature of the spherical groove 1532 is consistent with that of the hemispherical protrusion and fits the surface of the protrusion. The nozzle 1533 sprays water film evenly, covering more than 90% of the surface area of ​​the protrusion. The water channel 1534 divides the water flow to ensure that the water output of each nozzle is consistent and the water film thickness is uniform.

[0033] Furthermore, such as Figure 5 As shown, the water channel 1534 is arc-shaped and concentrically arranged with the spherical groove 1532. Multiple nozzles 1533 are arranged in an arc on the top wall of the spherical groove 1532 and connected to the water channel 1534. The concentric arc-shaped water flow channel ensures that the water flow is evenly distributed to each nozzle. The arc-shaped nozzles allow the water film to cover the convex spherical surface evenly, avoiding increased friction caused by local water shortage. This design greatly improves the water film coverage and further reduces the broken rice rate.

[0034] Specifically, such as Figure 3 , Figure 4 and Figure 6 As shown, the multiple hemispherical protrusions 111 are divided into multiple groups, and the multiple groups of hemispherical protrusions 111 are evenly distributed circumferentially on the outer wall of the polishing roller 11. Each group of multiple hemispherical protrusions 111 are evenly distributed along the length of the polishing roller 11, and the adjacent groups of hemispherical protrusions 111 are staggered. The hemispherical protrusions are evenly distributed in multiple groups around the circumference, with adjacent groups staggered to ensure that the rice is polished in all directions during transportation. This avoids the "partial unpolished" problem caused by traditional single-direction protrusions. The staggered design also reduces the collision force between the rice and the protrusions, further reducing the broken rice rate.

[0035] Specifically, such as Figures 6-8 As shown, a scraper 18 is installed on the side wall of the polishing box 2. The front end of the scraper 18 extends obliquely upward and is in contact with the outer wall of the polishing roller 11. A semi-circular groove 184 is opened at the front end of the scraper 18 to match and correspond to the hemispherical protrusion 111. A movable plate 182 that can retract into the scraper 18 is provided in the semi-circular groove 184. When the polishing roller 11 rotates and drives the hemispherical protrusion 111 to contact the movable plate 182, the movable plate 182 retracts into the scraper 18 until the hemispherical protrusion 111 passes through the semi-circular groove 184. The water film on the outer wall of the polishing roller 11 and the surface of the hemispherical protrusion 111 is evenly spread through the front end face of the scraper 18 and the semi-circular groove 184 respectively. The front end of the scraper 18 is in contact with the outer wall of the polishing roller. The radius of the semi-circular groove 184 is consistent with the protrusion to avoid scratching the protrusion. The movable plate 182 extends and retracts as the protrusion passes through. The scraper can spread the excess water film evenly and keep the water film thickness controlled at 5-10μm. At the same time, it scrapes off the rice bran residue on the roller wall to reduce contamination.

[0036] Furthermore, such as Figure 7 and Figure 8 As shown, the scraper 18 includes a scraper body 181 installed on the side wall of the polishing box 2. The front end of the scraper body 181 has a telescopic cavity 183 adapted to the movable plate 182. A semi-circular groove 184 is provided at the front end opening of the telescopic cavity 183 and runs vertically through it. The movable plate 182 is slidably assembled in the telescopic cavity 183 and is connected to the rear end inner wall of the telescopic cavity 183 through an elastic element. The telescopic cavity 183 provides sliding space for the movable plate. The elastic element adopts spring, sheet or other elastic combination structure to ensure that the movable plate fits tightly with the semi-circular groove when it is reset. The baffles on both sides of the scraper body form a guide channel. Excess water is recovered to the water storage equipment through the drain outlet 17, saving water resources. Furthermore, the side wall of the polishing box 2 is provided with a drain outlet 17 located above the end of the separating screen 13. The scraper body 181 is installed on the bottom surface of the drain outlet 17 and there is a gap between it and the top surface. Baffles are installed on both sides of the scraper body 181. The baffles are located on the outer sides of both ends of the polishing roller 2 and protrude to the upper surface of the scraper body 181 to form a guide groove. The tail end of the scraper body 181 extends to the outside of the polishing box 2 and is connected to the water storage device. Water is drawn from the water storage device by a water pump and transported to the water inlet at the top of the water tank 14. The water tank 14 has a water level viewing window so that water can be added in time. Specifically, such as Figure 1 and Figure 2 As shown, an air inlet pipe 9 is installed on one end face of the dust removal box 1 near the feed hopper 3, and a fan 7 is installed inside the air inlet pipe 9 through a mounting bracket. An exhaust pipe 8 connected to the dust collection equipment is installed on the other end face of the dust removal box 1. A spiral blade 6 located between the exhaust pipe 8 and the air inlet pipe 9 is installed inside the dust removal box 1. One end of the spiral blade 6 is fixed to the rotating shaft end of the fan 7, and the other end of the spiral blade 6 is rotatably connected through a stabilizer installed in the end opening of the exhaust pipe 8. The axes of the dust removal box 1, the spiral blade 6, the fan 7, the exhaust pipe 8, and the air inlet pipe 9 coincide, thereby forming a dust removal air duct connecting the exhaust pipe 8 and the air inlet pipe 9 in the central channel of the spiral blade 6. The synchronous rotation of the fan 7 and the spiral blades 6 forms a negative pressure dust removal duct. After the rice enters the impurity removal box, the floating bran is sucked into the exhaust pipe 8, reducing the amount of rice bran generated during the subsequent polishing process and reducing the burden on the separation screen. The stabilizing frame ensures that the spiral blades rotate smoothly and avoids friction with the inner wall of the impurity removal box.

[0037] Furthermore, such as Figure 1 As shown, a rice bran collection box 19 is provided at the bottom of the frame 22, located below the separating screen 13. A cleaning brush 20 for unblocking the screen holes is installed on the outer surface of the separating screen 13, and the cleaning brush 20 is driven by the driving component 21 to move back and forth along the length direction of the separating screen 13. The drive component 21 is preferably a reciprocating screw structure driven by a motor. The separating screen 13 is an arc-shaped sheet screen. The cleaning brush 20 is an arc shape adapted to the separating screen 13. Movable blocks are installed at both ends of the cleaning brush 20. The reciprocating screw is installed on one side of the outer wall of the polishing box 2. A guide rod parallel to the reciprocating screw is installed on the other side of the outer wall of the polishing box 2. One of the movable blocks of the separating screen 13 is fixed to the movable end of the reciprocating screw, and the other movable block is slidably assembled with the guide rod. The cleaning brush 20 below the separating screen 13 is driven by a reciprocating screw to move back and forth along the arc-shaped screen surface, clearing the screen holes in real time, reducing the screen hole blockage rate, and helping to improve screening efficiency. The rice bran collection box 19 can conveniently recycle rice bran and realize the secondary utilization of resources.

[0038] This device solves the problems of rice bran clogging, excessive rice moisture content, and high broken rice rate in traditional polishing technology through a coordinated process of "pre-removal of impurities → precise water film lubrication → polishing separation → water recycling". The core of the device revolves around the dynamic linkage of the "hemispherical protrusion trigger water film generator". The specific working principle is as follows: S1 Feeding and Air Classification: The rice to be polished enters the impurity removal box 1 from the feeding hopper 3. The fan 7 starts and drives the coaxially connected spiral blades 6 to rotate, forming a negative pressure dust removal air duct in the central channel of the spiral blades. During the process of rice falling in the impurity removal box, the light floating bran attached to the surface is sucked into the air duct by negative pressure and transported to the external dust collection equipment through the exhaust pipe 8. The pre-treated rice enters the polishing box 2 through the conveying pipe 5, which reduces the probability of rice bran coming into contact with water during the subsequent polishing process and reduces the risk of screen blockage from the source. In the initial state of S2, the water tank 14 stores a certain amount of clean water, and the water level is monitored through the viewing window. The movable tube 152 of the water film generator 15 is at its lowest position under the pre-tightening force of the spring 155. The sealing element 157 at the lower end of the sealing plug 154 is tightly fitted with the sealing groove 158 of the fixed tube 151 to form a conical seal. At this time, the water inlet 156 is completely hidden inside the fixed tube, and the water in the water tank cannot enter the movable tube. The water film generator is in the closed state. S3 polishing roller 11 is coaxially connected to spiral auger 12 and rotates synchronously under the drive of the drive equipment. The spiral auger slowly conveys the rice after impurity removal from the feed end to the discharge end of the polishing box. The hemispherical protrusion 111 rotates synchronously with the polishing roller. S4 When a certain group of hemispherical protrusions 111 rotates to the upper half of the polishing roller, i.e., the non-rice contact area, the top of the protrusion first contacts the lower spherical groove 1532 of the water outlet 153 of the water film generator. The radius of curvature of the spherical groove is consistent with that of the protrusion, ensuring a seamless fit. As the polishing roller continues to rotate, the hemispherical protrusion applies an upward pushing force to the water outlet, overcoming the preload of the spring 155 and pushing the movable tube 152 to slide upward along the fixed tube 151. During the upward movement of the movable tube, the sealing plug 154 rises synchronously, and the sealing element 157 separates from the sealing groove 158, forming a water inlet gap of 0.5-1mm. At the same time, the L-shaped water inlet hole 156 on the outer periphery of the upper end of the movable tube is gradually exposed in the water inlet gap as the movable tube moves upward. The clean water in the water tank flows into the L-shaped channel through the water inlet gap and is then transported to the water outlet 153 through the inner cavity of the movable tube. After the S6 clean water enters the water outlet, it flows through the internal arc-shaped water channel 1534 and is evenly distributed to the multiple arc-shaped nozzles 1533. The nozzles spray a small amount of clean water onto the hemispherical convex surface, with a single water output of 0.1-0.2 mL, forming a uniform lubricating water film with a thickness of 5-10 μm on the convex surface, with a water film coverage of ≥95%. S7 When the hemispherical protrusion rotates with the polishing roller to the position where it is separated from the spherical groove of the water outlet, the pushing force of the protrusion on the water outlet disappears, the spring 155 loses the external force constraint, the elastic deformation is restored, the movable tube 152 is pulled down to reset along the axial direction of the fixed tube, the sealing plug 154 moves down synchronously, the sealing element 157 is once again attached to the sealing groove 158 to form a conical seal, the water inlet gap is closed, the water inlet hole 156 is hidden again in the fixed tube, and the water film generator stops discharging water. As the polishing roller continues to rotate, the hemispherical protrusions with water film adhering to the surface of the S8 enter the rice contact area of ​​the lower half of the polishing roller, making flexible contact with the rice conveyed by the auger. The water film acts as a lubricant, reducing the rigid friction between the protrusions and the rice surface, preventing the rice grains from cracking or breaking, and reducing the broken rice rate. At the same time, the slight squeezing of the protrusions removes the residual chaff on the surface of the rice. The front end of the scraper 18 on the side wall of the S9 polishing box is in close contact with the outer wall of the polishing roller. When the hemispherical protrusion with water film rotates to the scraper position, the protrusion squeezes the movable plate 182 in the semi-circular groove 184 of the scraper. The movable plate retracts into the telescopic cavity 183, allowing the protrusion to pass through. At the same time, the front end of the scraper evenly spreads the rice bran residue and excess moisture on the outer wall of the polishing roller, and the inner wall of the semi-circular groove evenly spreads the water film on the surface of the protrusion, ensuring that the water film thickness is stable at 5-10μm, and avoiding excessive local water film thickness that causes the rice to become damp. The baffles on both sides of the S10 scraper form a guide channel. Excess water flows into the external water storage equipment through the drain outlet 17 on the side wall of the polishing box. Then, the water is pumped to the water tank 14 to realize the recycling of water resources and reduce water consumption. During the S11 polishing process, the rice and a small amount of dry rice bran that fall off are continuously conveyed to the discharge end by the screw conveyor. Under the action of gravity, they fall onto the separation screen 13 at the lower end. The dry rice bran falls into the rice bran collection box 19 below through the screen holes. The cleaning brush 20 moves back and forth along the screen surface under the drive of the reciprocating screw to clear the screen holes in real time. The polished rice separated from S12 is discharged from outlet 4, completing the entire polishing process. The rice moisture content is controlled within a safe storage range of 14%-16%, without the need for additional drying.

[0039] In summary, this device achieves "on-demand water supply and precise lubrication" through the dynamic linkage of "contact-lift-detachment-reset" between the hemispherical protrusion and the water film generator. It solves the drawbacks of traditional water-spray polishing and avoids the problem of broken rice in dry polishing, making it suitable for polishing needs of rice with different hardness, such as indica rice and japonica rice.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A rice surface polishing device for rice processing, comprising a cleaning box (1) and a polishing box (2) mounted on a frame (22), wherein a feed hopper (3) and a discharge port (4) are respectively installed at the feed end of the cleaning box (1) and the discharge end of the polishing box (2), and the discharge end of the cleaning box (1) and the feed end of the polishing box (2) are connected by a conveying pipe (5), characterized in that: The polishing box (2) is rotatably mounted with a polishing roller (11) and a spiral auger (12) connected coaxially. The input end of the spiral auger (12) is driven to rotate by a drive device. A separation screen (13) is installed on the lower end face of the polishing box (2). A water tank (14) is installed on the upper end face of the polishing box (2) extending into its inner cavity and facing the outer peripheral surface of the polishing roller (11). Multiple water film generators (15) are linearly and evenly distributed along the axis of the polishing roller (11) at the lower end of the water tank (14). The outer peripheral surface of the polishing roller (11) has multiple hemispherical protrusions (111) evenly distributed. The hemispherical protrusions (111) intermittently trigger the water film generators (15) as the polishing roller (11) rotates, so that the water film generators (15) form a lubricating water film on the surface of the hemispherical protrusions (111). The water film generator (15) includes a fixed tube (151) installed at the lower end of the water tank (14). A movable tube (152) is fitted inside the fixed tube (151) through an axial sliding seal. The lower end of the movable tube (152) extends to the bottom of the water tank (14) and is fitted with a water outlet (153) opposite to the polishing roller (11). A sealing plug (154) for sealing the upper opening of the fixed tube (151) is installed at the upper end of the movable tube (152). A water inlet hole (156) is opened on the outer periphery of the upper end of the movable tube (152), and the water inlet hole (156) is connected to the water inlet end of the water outlet (153) through the inner cavity of the movable tube (152). A spring (155) is also fitted on the movable tube (152) and fixed between the fixed tube (151) and the water outlet (153). The inlet hole (156) has an L-shaped cross section. The long side of the L-shaped channel is open on the outside and is vertically arranged along the upper outer periphery of the movable tube (152). The short side of the L-shaped channel is connected to the inner cavity of the movable tube (152). The rotation of the polishing roller (11) causes the hemispherical protrusion (111) to intermittently push the water outlet (153) upward, so that the sealing plug (154) moves upward and separates from the upper end of the fixed tube (151) to form an inlet gap. The upper end of the movable tube (152) drives the inlet hole (156) to extend into the inlet gap, so that the water in the water tank (14) enters the movable tube (152) through the inlet hole (156) and is coated on the surface of the hemispherical protrusion (111) through the water outlet (153). The upper opening of the fixed tube (151) has a sealing groove (158) on the inner wall. The lower end face of the sealing plug (154) is fitted with a sealing element (157) that is fitted onto the upper end of the movable tube (152). The sealing element (157) and the sealing groove (158) are a conical sealing structure that is compatible with each other, thereby forming a conical seal. The water outlet (153) includes a water outlet seat (1531) installed at the lower end of the movable pipe (152). The lower end face of the water outlet seat (1531) is provided with a spherical groove (1532) that is adapted to the hemispherical protrusion (111). Multiple nozzles (1533) are installed on the inner wall of the spherical groove (1532). The interior of the water outlet seat (1531) has a water channel (1534). The inlet end of the water channel (1534) is connected to the lower end cavity of the movable pipe (152). The water channel (1534) has multiple outlet ends, and the multiple outlet ends correspond to and are connected to the multiple nozzles (1533) respectively. The water channel (1534) is arc-shaped and concentrically arranged with the spherical groove (1532). Multiple nozzles (1533) are arranged in an arc on the top wall of the spherical groove (1532) and connected to the water channel (1534).

2. The rice surface polishing device for rice processing according to claim 1, characterized in that, Multiple hemispherical protrusions (111) are divided into multiple groups. The multiple groups of hemispherical protrusions (111) are evenly distributed circumferentially on the outer wall of the polishing roller (11). The multiple hemispherical protrusions (111) in each group are evenly distributed along the length of the polishing roller (11), and the adjacent two groups of hemispherical protrusions (111) are staggered.

3. The rice surface polishing device for rice processing according to claim 1, characterized in that, A scraper (18) is installed on the side wall of the polishing box (2). The front end of the scraper (18) extends obliquely upward and is in contact with the outer wall of the polishing roller (11). The front end of the scraper (18) is provided with a semi-circular groove (184) that is adapted to and corresponds to the hemispherical protrusion (111). A movable plate (182) that can retract into the scraper (18) is provided in the semi-circular groove (184). When the polishing roller (11) rotates and drives the hemispherical protrusion (111) to contact the movable plate (182), the movable plate (182) retracts into the scraper (18) until the hemispherical protrusion (111) passes through the semi-circular groove (184). The water film on the outer wall of the polishing roller (11) and the surface of the hemispherical protrusion (111) is evenly spread by the front end of the scraper (18) and the semi-circular groove (184).

4. The rice surface polishing device for rice processing according to claim 3, characterized in that, The scraper (18) includes a scraper body (181) installed on the side wall of the polishing box (2). The front end of the scraper body (181) has a telescopic cavity (183) adapted to the movable plate (182). A semi-circular groove (184) is provided at the front end opening of the telescopic cavity (183) and runs vertically through it. The movable plate (182) is slidably assembled in the telescopic cavity (183) and is connected to the rear end inner wall of the telescopic cavity (183) through an elastic element.

5. The rice surface polishing apparatus for rice processing according to any one of claims 1-4, characterized in that, An air inlet pipe (9) is installed on one side of the dust removal box (1) near the feed hopper (3), and a fan (7) is installed inside the air inlet pipe (9) via a mounting bracket. An exhaust pipe (8) connected to the dust collection equipment is installed on the other side of the dust removal box (1). A spiral blade (6) located between the exhaust pipe (8) and the air inlet pipe (9) is installed inside the dust removal box (1). One end of the spiral blade (6) is fixed to the shaft end of the fan (7), and the other end of the spiral blade (6) is rotatably connected via a stabilizer installed in the end opening of the exhaust pipe (8). The axes of the dust removal box (1), the spiral blade (6), the fan (7), the exhaust pipe (8), and the air inlet pipe (9) coincide, thereby forming a dust removal duct connecting the exhaust pipe (8) and the air inlet pipe (9) in the central channel of the spiral blade (6).

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