Rice surface polishing device for rice processing

Abstract

The invention relates to the technical field of rice polishing, and provides a rice surface polishing device for rice processing, the rice surface polishing device comprises an impurity removal box and a polishing box which are mounted on a rack, and a feeding hopper and a discharging port are mounted at the feeding end of the impurity removal box and the discharging end of the polishing box correspondingly; and the discharging end of the impurity removing box is connected with the feeding end of the polishing box through a conveying pipe, and a polishing roller and a spiral auger which are coaxially connected are rotationally installed in the polishing box. Rigid friction of dry polishing is avoided, the broken rice rate is reduced, contact between water and rice and rice bran is greatly reduced, the water content of rice is effectively controlled, water spraying is prevented from exceeding the standard, the water content of rice bran can be reduced, the mesh blocking and mildew risk is effectively prevented, an additional drying procedure is not needed, energy consumption and cost are reduced, and the method is suitable for large-scale production. The technical problems that in the prior art, rice bran is high in humidity due to water spraying polishing, rice is prone to mildewing due to overproof water content, and the broken rice rate is high due to dry polishing are solved.

Description

Technical Field

[0001] The invention relates to the technical field of rice polishing, in particular to a rice surface polishing device for rice processing. Background Art

[0002] During the polishing process of rice processing, traditional equipment typically uses a water jet polishing method. This method sprays atomized water onto the contact area between the polishing roller and the rice. The water film's lubricating effect reduces friction damage on the rice grain surface and removes floating bran. However, this method has two major issues: 1. Wet rice bran blocks the sieve holes: After the rice bran produced by polishing mixes with the water mist, the moisture is absorbed by the rice bran fibers, resulting in a significant increase in the humidity of the rice bran (the moisture content can reach 15%~20%). When the wet rice bran is subsequently separated by a vibrating screen or a negative pressure screen, it is very easy to adhere to the surface of the sieve holes or stick to each other into clumps, causing sieve hole blockage, seriously affecting the screening efficiency and rice bran removal effect; 2. Excessive moisture content in rice: Excessive water mist adheres to the surface of the rice (the moisture content of the rice may increase from the standard range of 14%-16% to 17%-19%). This not only fails to meet the safe moisture standards for grain storage (prone to mold), but also requires an additional drying process, resulting in increased processing energy consumption and costs.

[0003] Some current rice polishing equipment attempts to address the moisture content issue by adding a drying module or installing a suction roller after polishing. However, these efforts fail to reduce the contact between water mist and rice bran at the source. Furthermore, the drying module increases equipment complexity and energy consumption, while the suction roller has limited effectiveness in separating adhered wet rice bran. To reduce the impact of water mist, some polishing devices use dry polishing (without water spray). However, there is a lack of lubrication between the polishing roller and the rice grains, resulting in direct rigid collision (especially when the rice grains come into contact with the surface of the high-speed rotating metal polishing roller), which 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 spray polishing, seriously affecting the quality and commercial value of rice.

[0004] In order to solve the above problems, the present application proposes a rice surface polishing device for rice processing. Summary of the Invention

[0005] To overcome the above-mentioned defects, an embodiment of the present invention provides a rice surface polishing device for rice processing, which solves the technical problems in the prior art of water spray polishing resulting in high rice bran humidity, excessive rice moisture content and easy mildew, and high broken rice rate in dry 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 dust removal box and a polishing box installed on a frame, the feed end of the dust removal box and the discharge end of the polishing box are respectively equipped with a feed hopper and a discharge port, and the discharge end of the dust removal box and the feed end of the polishing box are connected by a conveying pipe, the interior of the polishing box is rotatably installed with a coaxially connected polishing roller and a spiral auger, and the input end of the spiral auger is driven to rotate by a driving device, the lower end face of the polishing box is installed with a separation screen, the upper end face of the polishing box is installed with a water tank extending to its inner cavity and opposite to the outer peripheral surface of the polishing roller, the lower end of the water tank is installed with a plurality of water film generators linearly evenly distributed along the axis direction of the polishing roller, 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 generator as the polishing roller rotates, so that the water film generator forms a lubricating water film on the surface of the hemispherical protrusions.

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

[0008] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein the cross-section of the water inlet is L-shaped, the outer side of the L-shaped long side channel is open and is vertically arranged along the outer circumference of the upper end of the movable tube, and the L-shaped short side channel is connected to the inner cavity of the movable tube. The rotation of the polishing roller drives the hemispherical protrusion to intermittently push the water outlet upward, so that the sealing plug moves upward and disengages from the upper end of the fixed tube to form a water inlet gap. The upper end of the movable tube drives the water inlet hole to extend into the water inlet gap, so that water in the water tank enters the movable tube through the water inlet hole and is coated on the surface of the hemispherical protrusion through the water outlet. An assembly hole that matches the water tank is opened at the upper end of the polishing box. 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 installed with a connecting plate. The connecting plate is slidably assembled with the frame and the height is adjusted by the lifting equipment to adjust the distance between the water film generator and the polishing roller, thereby adjusting the height of the hemispherical protrusion to lift the water film generator upward, and then 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, so as to facilitate the adjustment of the water output according to actual conditions.

[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 the lower end surface of the sealing plug is equipped with a sealing member that is sleeved on the upper end of the movable tube. The sealing member and the sealing groove form a conical sealing structure that is adapted to each other, thereby forming a conical seal.

[0010] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein a water outlet includes a water outlet seat installed at the lower end of a movable tube, a spherical groove adapted to the hemispherical protrusion is provided on the lower end surface of the water outlet seat, and a plurality of nozzles are installed on the inner wall of the spherical groove, a water flow channel is provided inside the water outlet seat, an inlet end of the water flow channel is connected to the inner cavity of the lower end of the movable tube, and the water flow channel has multiple outlet ends, and the multiple outlet ends correspond one-to-one to and are connected to the multiple 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 flow channel is arc-shaped and is arranged concentrically with the spherical groove, and multiple nozzles are arranged in an arc on the top wall of the spherical groove and are connected to the water flow channel.

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

[0013] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, in which 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, the front end of the scraper is provided with a semicircular groove adapted to and corresponding to the hemispherical protrusion, and a movable plate that can be retracted into the scraper is provided in the semicircular 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 semicircular 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 surface of the scraper and the semicircular groove.

[0014] For example, in at least one embodiment of the present invention, a rice surface polishing device for rice processing is provided, wherein a scraper includes a scraper body mounted on a side wall of a polishing box, a telescopic cavity adapted for a movable plate is defined within the front end of the scraper body, a semicircular groove is provided at the front end opening of the telescopic cavity and extends vertically therethrough, the movable plate is slidably assembled within the telescopic cavity and connected to the rear end inner wall of the telescopic cavity via an elastic member; The side wall of the polishing box is provided with a drain outlet located above the end of the separation screen. The scraper body is installed on the bottom surface of the drain outlet and there is a gap with the top surface. Baffles are installed on both sides of the scraper body. The baffles are arranged on the outside of the two 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. The water in the water storage equipment is pumped out by a water pump and transported to the water inlet at the upper end of the water tank. The water tank has a water level visual window for timely adding water.

[0015] For example, in a rice surface polishing device for rice processing provided by at least one embodiment of the present invention, an air inlet pipe is installed on one end face of a dust removal box close to a feed hopper, and a fan is installed inside the air inlet pipe through a mounting frame, an exhaust pipe connected to a dust collecting device is installed on the other end face of the dust removal box, the exhaust pipe is connected to the upper part of the polishing box through a bracket, a spiral blade is installed inside the dust 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 through a stabilizing frame installed in the end opening of the exhaust pipe, the axes of the dust removal box, the spiral blade, the fan, the exhaust pipe and the air inlet pipe coincide, thereby forming a dust removal air 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 a frame and is located below a separation screen. A cleaning brush for clearing the screen holes is installed on the outer surface of the separation screen, and the cleaning brush is driven by a driving member to reciprocate along the length direction of the separation screen. The driving member is preferably a reciprocating screw structure driven by a motor, the separation screen is an arc-shaped sheet screen, the cleaning brush is an arc-shaped screen that matches the separation screen, and 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 separation 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 the present invention are: (1) Solve the problem from the source through the collaborative structure of "polishing roller + water film generator": The hemispherical protrusions on the outer circumference of the polishing roller intermittently trigger the water film generator as the roller rotates, forming a lubricating water film only on the protruding surface of the non-contact area of ​​the polishing roller (the upper half of the roller, the rotation path that does not come into contact with the rice grains), rather than spraying water on the contact area between the rice and the roller. The water film is brought into the polishing area by the rotation of the roller to achieve lubrication, which 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 preventing the risk of sieve clogging and mildew, and eliminating the need for an additional drying process, reducing energy consumption and costs. This solves the technical problems in the prior art of water spray polishing that result in high humidity in rice bran, excessive moisture content in rice that is prone to mildew, and high broken rice rate in dry polishing; (2) The water film generator achieves precise water control through the "movable tube + spring + sealing plug": when the hemispherical protrusion pushes up the water outlet, the movable tube moves upward to open the water inlet hole, and the water in the water tank is accurately delivered to the protrusion surface; when not triggered, the sealing plug blocks the fixed tube to prevent ineffective water leakage. At the same time, the water tank is assembled with the frame through the connecting plate, and the distance with the polishing roller can be adjusted by the lifting equipment to control the water output, so as to adapt to different hardness of rice such as indica rice and japonica rice. For example, when processing fragile indica rice, the thickness of the water film can be reduced to avoid excessive wetting. 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; (3) 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, and the semicircular groove is adapted to the hemispherical protrusion. The movable plate can retract as the protrusion passes, which not only prevents the scraper from scratching the protrusion, but also can evenly spread the excess water on the surface of the protrusion through the semicircular groove, ensuring that the thickness of the water film on each protrusion is consistent. It can also evenly spread the water dripping onto the outer wall of the polishing roller. In addition, the baffles on both sides of the scraper form a diversion groove, and the excess water is recovered through the drain outlet to the water storage equipment for recycling, further reducing water waste and preventing water from remaining on the surface of the rice, and controlling the moisture content again from the back end; (4) The impurity removal box forms a dust removal air duct through the fan and spiral blades, removing the floating bran on the surface of the rice before it enters the polishing box, reducing the amount of rice bran generated during the subsequent polishing process and alleviating 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 curved screen surface, clearing the screen holes in real time and reducing the blockage rate of the screen holes, which helps to improve the screening efficiency. The rice bran collection box can conveniently recycle rice bran to achieve secondary utilization of resources; (5) The hemispherical protrusions are divided into multiple groups that are evenly distributed circumferentially, 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 conveys the rice, the staggered protrusions can polish the rice grains at different angles, avoiding the "partial unpolished" problem caused by traditional single-direction protrusions, and can also adapt to the unique design of the water film generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0019] Figure 1 Schematic diagram of the structure of a rice surface polishing device for rice processing according to one embodiment of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the front cross-sectional structure of the central debris removal box; Figure 3 For the present invention Figure 1 Front cross-sectional structural diagram of the middle polishing box; Figure 4 For the present invention Figure 3 Schematic diagram of the partial cross-section structure of the lower end of the intermediate water tank; Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure of the water film generator; Figure 6 For the present invention Figure 1 A schematic diagram of the side cross-sectional structure of the middle polishing box; Figure 7 For the present invention Figure 6 Schematic diagram of the top view of the middle scraper; Figure 8 For the present invention Figure 7 Schematic diagram of the partial cross-sectional structure of the middle scraper.

[0020] Figure: 1, debris removal box; 2, polishing box; 3, feed hopper; 4, discharge port; 5, feed pipe; 6, spiral blade; 7, fan; 8, exhaust pipe; 9, air inlet pipe; 10, bracket; 11, polishing roller; 111, hemispherical protrusion; 12, spiral auger; 13, separation screen; 14, water tank; 15, water film generator; 151, fixed pipe; 152, movable pipe; 153, water outlet; 1531, water outlet seat; 153 2. Spherical groove; 1533. Nozzle; 1534. Water flow channel; 154. Sealing plug; 155. Spring; 156. Water inlet hole; 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 collecting box; 20. Cleaning brush; 21. Driving part; 22. Frame. DETAILED DESCRIPTION

[0021] The application will be further described below in conjunction with the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not to be used as limitations.

[0022] For the purpose of clarity, only the parts of the apparatus that are pertinent to the application are shown in the drawings, and they do not represent the actual structure of the product. In addition, for the purpose of simplicity and easy understanding, in some of the drawings, only one of the parts having the same structure or function is shown schematically, or only one of them is labeled. In this document, "one" means not only "only one", but also "more than one", and "several" includes "two" and "more than two".

[0023] In this document, it is to be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0024] In the application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. "Under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0025] In the description of the embodiments, the terms "up", "down", "left", "right", and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0026] In addition, in the description of the present application, the terms "first", "second", etc. are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0027] As Figures 1-8As shown, a rice surface polishing device for rice processing in one embodiment of the present disclosure is shown, comprising a dust removal box 1 and a polishing box 2 mounted on a frame 22, wherein the feed end of the dust removal box 1 and the discharge end of the polishing box 2 are respectively equipped with a feed hopper 3 and a discharge port 4, and the discharge end of the dust removal box 1 and the feed end of the polishing box 2 are connected by a feed pipe 5, and a coaxially connected polishing roller 11 and a spiral auger 12 are rotatably mounted inside the polishing box 2, and the input end of the spiral auger 12 is driven to rotate by a driving device. The lower end surface of the polishing box 2 is installed with a separation screen 13, and the upper end surface of the polishing box 2 is installed with a water tank 14 extending into its inner cavity and opposite to the outer peripheral surface of the polishing roller 11. The lower end of the water tank 14 is installed with a plurality of water film generators 15 linearly and evenly distributed along the axis direction of the polishing roller 11. The outer peripheral surface of the polishing roller 11 has a plurality of evenly distributed hemispherical protrusions 111, 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; In order to solve the problems of damp rice bran clogging the sieve holes and excessive moisture content of rice in traditional water-jet polishing, this device is optimized through "precise water film lubrication + pre-impurity removal". The polishing roller 11 and the spiral auger 12 rotate coaxially. When the spiral auger conveys rice, the hemispherical protrusion 111 intermittently triggers the water film generator 15, forming only a thin water film with a thickness of 5-10μm on the surface of the protrusion. The water film is brought into the polishing area with the roller body to achieve lubrication, avoiding direct contact between water and rice and rice bran. The separation screen 13 separates the rice bran, and cooperates with the pre-impurity removal box 1 to remove floating bran. The sieve hole clogging rate is greatly reduced, and the rice moisture content can be controlled within the safe range of 14%-16% without the need for an additional drying process.

[0028] Specifically, if Figure 3-Figure 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 installed in 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 installed with a water outlet 153 opposite to the polishing roller 11. The upper end of the movable tube 152 is installed with a sealing plug 154 for sealing the upper end opening of the fixed tube 151. 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. The movable tube 152 is also sheathed with a spring 155 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 pushes up the water outlet 153, the movable tube 152 moves upward with a displacement of 2-5mm, the sealing plug 154 disengages from the fixed tube 151, the water inlet 156 is connected, 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, and the sealing plug blocks the fixed tube to prevent invalid water leakage. The axial sliding seal ensures that there is no leakage when the movable tube slides.

[0029] Furthermore, if Figure 5 As shown, the cross-section of the water inlet hole 156 is L-shaped. The outer side of the L-shaped long side channel is open and is vertically arranged along the outer circumference of the upper end of the movable tube 152. The short side channel 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, causing the sealing plug 154 to move upward and disengage 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 hole 156 to extend into the water inlet gap, so that water in the water tank 14 enters the movable tube 152 through the water inlet hole 156 and is coated on the surface of the hemispherical protrusion 111 through the water outlet 153. The L-shaped water inlet hole 156 ensures precise water flow when the movable tube moves upward. The water inlet gap controls the water inlet volume to avoid excessive water supply. The water film is only coated on the raised surface of the hemispherical shape and contacts the rice as the polishing roller rotates. The lubrication effect is better than that of traditional water spraying, which helps to reduce the broken rice rate from 15%-25% to below 5%.

[0030] Furthermore, an assembly hole that is compatible with the water tank is opened at the upper end of the polishing box, and 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 installed with a connecting plate. The connecting plate is slidably assembled with the frame and the height is adjusted by the lifting equipment to adjust the distance between the water film generator and the polishing roller, thereby adjusting the height of the hemispherical protrusion to lift the water film generator upward, and then 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, so as to facilitate the adjustment of the water output according to actual conditions.

[0031] Furthermore, if Figure 5 As shown, the inner wall of the upper opening of the fixed tube 151 has a sealing groove 158, and the lower end surface of the sealing plug 154 is installed with a sealing member 157 that is sleeved on the upper end of the movable tube 152. The sealing member 157 and the sealing groove 158 form a conical sealing structure that adapts to each other, thereby forming a conical seal; The seal 157 of the conical sealing structure is made of silicone and fits tightly with the sealing groove 158. The sealing pressure is ≥0.5MPa, ensuring that there is no water leakage when not triggered. The conical design facilitates automatic centering when the movable tube is reset. The sealing reliability is greatly improved compared to the flat seal, and it can adapt to long-term high-frequency triggering.

[0032] Furthermore, if 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 surface of the water outlet seat 1531 is provided with a spherical groove 1532 adapted to the hemispherical protrusion 111, and the inner wall of the spherical groove 1532 is installed with multiple nozzles 1533. 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 respectively. The curvature radius of the spherical groove 1532 is consistent with that of the hemispherical protrusion and fits the surface of the protrusion. The nozzle 1533 evenly sprays the water film, covering more than 90% of the surface area of ​​the protrusion. The water flow channel 1534 diverts the water flow to ensure that the water output of each nozzle is consistent and the water film thickness is uniform.

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

[0034] Specifically, if 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 on the outer wall of the polishing roller 11 in the circumferential direction. The multiple hemispherical protrusions 111 in each group are evenly distributed along the length direction of the polishing roller 11, and the hemispherical protrusions 111 in two adjacent groups are staggered. The hemispherical protrusions are divided into 111 groups and evenly distributed circumferentially, with adjacent groups staggered to ensure that the rice is polished in all directions during transportation, avoiding the "partial unpolished" problem caused by traditional single-direction protrusions. The staggered design can also reduce the collision force between the rice and the protrusions, further reducing the broken rice rate.

[0035] Specifically, if Figure 6-Figure 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 abuts against the outer wall of the polishing roller 11. A semicircular groove 184 is formed at the front end of the scraper 18 to match and correspond to the hemispherical protrusion 111. A movable plate 182 that can be retracted into the scraper 18 is provided in the semicircular 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 semicircular 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 surface of the scraper 18 and the semicircular groove 184 respectively. The front end of the scraper 18 fits with the outer wall of the polishing roller, and the radius of the semicircular groove 184 is consistent with the protrusion to avoid scratching the protrusion. The movable plate 182 expands and contracts as the protrusion passes. The scraper can evenly spread the excess water film and keep the water film thickness controlled at 5-10μm. At the same time, it scrapes off the residual rice bran on the roller wall to reduce pollution.

[0036] Furthermore, if Figure 7 and Figure 8 As shown, the scraper 18 includes a scraper body 181 mounted on the side wall of the polishing box 2. A telescopic cavity 183 adapted to the movable plate 182 is defined within the front end of the scraper body 181. A semicircular groove 184 is provided at the front end opening of the telescopic cavity 183 and extends vertically therethrough. The movable plate 182 is slidably assembled within the telescopic cavity 183 and connected to the rear end inner wall of the telescopic cavity 183 via an elastic member. The telescopic cavity 183 provides sliding space for the movable plate. The elastic member adopts a spring, a spring or other elastic combination structure to ensure that the movable plate fits tightly into the semicircular groove when it is reset. The baffles on both sides of the scraper body form a guide groove. The excess water is recovered to the water storage device through the drain port 17, saving water resources. Furthermore, the sidewall of the polishing box 2 is provided with a drain port 17 located above the end of the separation screen 13. A scraper body 181 is mounted on the bottom surface of the drain port 17, with a gap between it and the top surface. Baffles are mounted on both sides of the scraper body 181. These baffles are located outside the polishing roller 2 and protrude from the upper surface of the scraper body 181, forming a diversion channel. The rear end of the scraper body 181 extends outside the polishing box 2 and is connected to a water storage device. Water is pumped from the water storage device via a water pump and delivered to the water inlet at the top of the water tank 14. The water tank 14 also has a water level visual window to facilitate timely refilling. Specifically, if Figure 1 and Figure 2 As shown, an air inlet pipe 9 is installed on one end face of the debris removal box 1 close to the feed hopper 3, and a fan 7 is installed inside the air inlet pipe 9 through a mounting frame, and an exhaust pipe 8 connected to the dust collecting equipment is installed on the other end face of the debris removal box 1. A spiral blade 6 is installed inside the debris removal box 1 between the exhaust pipe 8 and the air inlet pipe 9, 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 stabilizing frame installed in the opening of the end of the exhaust pipe 8. The axes of the debris removal box 1, the spiral blade 6, the fan 7, the exhaust pipe 8 and the air inlet pipe 9 coincide, so that a dust removal air duct connecting the exhaust pipe 8 and the air inlet pipe 9 is formed in the central channel of the spiral blade 6; Through the synchronous rotation of the fan 7 and the spiral blade 6, a negative pressure dust removal air duct is formed. After the rice enters the dust removal box, the floating bran is sucked into the exhaust pipe 8, reducing the amount of rice bran generated in the subsequent polishing process and alleviating the burden on the separation screen. The stabilizing frame ensures that the spiral blade rotates smoothly to avoid friction with the inner wall of the dust removal box.

[0037] Furthermore, if Figure 1 As shown, a rice bran collecting box 19 is provided at the bottom of the frame 22 and is located below the separation screen 13. A cleaning brush 20 for clearing the sieve holes is installed on the outer surface of the separation screen 13, and the cleaning brush 20 is driven by a driving member 21 to reciprocate along the length direction of the separation screen 13. The driving member 21 is preferably a reciprocating screw structure driven by a motor, the separation screen 13 is an arc-shaped sheet screen, the cleaning brush 20 is an arc-shaped one adapted to the separation screen 13, and 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, and 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 separation 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 separation screen 13 is driven by a reciprocating screw and moves back and forth along the curved screen surface, clearing the screen holes in real time and reducing the blockage rate of the screen holes, which helps to improve the 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 rates in traditional polishing technology through the coordinated full-process of "pre-cleaning → precise water film lubrication → polishing separation → water recycling cycle". The core revolves around the dynamic linkage of "hemispherical protrusion triggering water film generator". The specific working principle is as follows: S1 Feeding and air separation and impurity removal: The rice to be ground enters the impurity removal box 1 from the feed hopper 3, and the fan 7 starts and drives the coaxially connected spiral blades 6 to rotate, forming a negative pressure dust removal air duct in the center channel of the spiral blades; As the rice falls in the impurity removal box, the light floating bran attached to the surface is sucked into the air duct by the 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 feed pipe 5, reducing the probability of rice bran coming into contact with water during the subsequent polishing process and reducing the risk of sieve blockage from the source; In the initial state S2, a fixed amount of clean water is stored in the water tank 14, and the water level is monitored through a viewing window. The movable tube 152 of the water film generator 15 is at its lowest position under the preload force of the spring 155. The sealing member 157 at the lower end of the sealing plug 154 fits tightly with the sealing groove 158 of the fixed tube 151, forming a conical seal. At this time, the water inlet hole 156 is completely hidden in the fixed tube, and the water in the water tank cannot enter the movable tube. The water film generator is in the closed state. The S3 polishing roller 11 is coaxially connected to the spiral auger 12 and rotates synchronously under the drive of the driving device. The spiral auger slowly transports the cleaned rice from the feeding end to the discharging end of the polishing box, and the hemispherical protrusion 111 rotates synchronously with the polishing roller; S4 When a 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 spherical groove 1532 at the lower end of the water outlet 153 of the water film generator. The curvature radius of the spherical groove is consistent with that of the protrusion, ensuring a gapless fit. As the polishing roller continues to rotate (S5), the hemispherical protrusion exerts an upward thrust on the water outlet, overcoming the preload of the spring 155 and pushing the movable tube 152 to slide upward along the axial direction of the fixed tube 151. As the movable tube moves upward, the sealing plug 154 rises synchronously, and the sealing member 157 disengages 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 gradually becomes exposed in the water inlet gap as the movable tube moves upward. The clean water in the water tank flows through the water inlet gap into the L-shaped channel and is then transported to the water outlet 153 through the inner cavity of the movable tube. After entering the water outlet, S6 clean water flows through the internal arc-shaped water flow channel 1534 and is evenly distributed to the nozzles 1533 arranged in an arc shape. The nozzles spray a small amount of clean water onto the surface of the hemispherical convex surface. The single water output is 0.1-0.2mL, forming a uniform lubricating water film with a thickness of 5-10μm on the convex surface, and the water film coverage rate is ≥95%; S7 When the hemispherical protrusion rotates with the polishing roller to a position away from the spherical groove of the water outlet, the thrust of the protrusion on the water outlet disappears, the spring 155 loses the external force constraint, and the elastic deformation is restored, pulling the movable tube 152 downward to reset along the axial direction of the fixed tube. The sealing plug 154 moves downward synchronously, and the sealing member 157 fits with the sealing groove 158 again to form a conical seal. The water inlet gap is closed, the water inlet hole 156 is hidden in the fixed tube again, and the water film generator stops discharging water. The hemispherical protrusions with water film on the surface of S8 continue to rotate with the polishing roller and enter the rice contact area on the lower half of the polishing roller, making flexible contact with the rice conveyed by the spiral 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 floating bran remaining on the rice surface. The front end of the scraper 18 on the side wall of the S9 polishing box fits tightly against the outer wall of the polishing roller. When the hemispherical protrusion with the water film attached rotates to the scraper position, the protrusion squeezes the movable plate 182 in the semicircular groove 184 of the scraper, and the movable plate shrinks 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 water on the outer wall of the polishing roller, and the inner wall of the semicircular groove evenly spreads the water film on the surface of the protrusion, ensuring that the water film thickness is stable at 5-10 μm, avoiding the local water film being too thick and causing the rice to get wet; The baffles on both sides of the S10 scraper form a guide groove, and the excess water flows into the external water storage device through the drain port 17 on the side wall of the polishing box, and then the recovered water is transported to the water tank 14 by the water pump, realizing the recycling of water resources and reducing water consumption; In step S11, the rice and a small amount of dry rice bran that has fallen off during the polishing process are continuously transported to the discharge end along the spiral auger, and fall onto the separation screen 13 at the lower end under the action of gravity. The dry rice bran passes through the screen holes and falls into the rice bran collecting box 19 below. The cleaning brush 20 moves back and forth along the screen surface under the drive of the reciprocating screw to unclog the screen holes in real time. The polished rice after separation in S12 is discharged from the discharge port 4, completing the entire polishing process. The moisture content of the rice is controlled within the safe storage range of 14%-16%, and no additional drying is required.

[0039] In summary, this device achieves "water supply on demand and precise lubrication" through the dynamic linkage of "contact-lifting-detachment-reset" between the hemispherical protrusion and the water film generator. It not only solves the drawbacks of traditional water jet polishing, but also avoids the problem of broken rice in dry polishing, and is suitable for the 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in 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 mounted on 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 via a feed pipe (5), characterized in that: A polishing roller (11) and a spiral auger (12) connected coaxially are installed in the polishing box (2) for rotation, and 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 surface of the polishing box (2). A water tank (14) extending into its inner cavity and opposite to the outer peripheral surface of the polishing roller (11) is installed on the upper end surface of the polishing box (2). A plurality of water film generators (15) linearly uniformly distributed along the axis direction of the polishing roller (11) are installed at the lower end of the water tank (14). The outer peripheral surface of the polishing roller (11) has a plurality of uniformly distributed hemispherical protrusions (111), and the hemispherical protrusions (111) intermittently trigger the water film generator (15) as the polishing roller (11) rotates, so that the water film generator (15) forms a lubricating water film on the surface of the hemispherical protrusions (111).

2. The rice surface polishing device for rice processing according to claim 1, characterized in that: 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 sleeved in 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 installed with a water outlet (153) opposite to the polishing roller (11), the upper end of the movable tube (152) is installed with a sealing plug (154) for sealing the upper end opening of the fixed tube (151), the outer periphery of the upper end of the movable tube (152) is provided with a water inlet hole (156), and the water inlet hole (156) is communicated with the water inlet end of the water outlet (153) through the inner cavity of the movable tube (152), and the movable tube (152) is also sleeved with a spring (155) fixed between the fixed tube (151) and the water outlet (153).

3. The rice surface polishing device for rice processing according to claim 2, characterized in that: The cross section of the water inlet hole (156) is L-shaped, the outer side of the L-shaped long side channel is open and is vertically arranged along the outer peripheral surface of the upper end of the movable tube (152), and the L-shaped short side channel is connected to the inner cavity of the movable tube (152). The hemispherical protrusion (111) is driven by the rotation of the polishing roller (11) 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 hole (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 hole (156) and is coated on the surface of the hemispherical protrusion (111) through the water outlet (153).

4. The rice surface polishing device for rice processing according to claim 2, characterized in that: The inner wall of the upper opening of the fixed tube (151) is provided with a sealing groove (158), and the lower end surface of the sealing plug (154) is provided with a sealing member (157) sleeved on the upper end of the movable tube (152). The sealing member (157) and the sealing groove (158) are mutually adapted conical sealing structures, thereby forming a conical seal.

5. The rice surface polishing device for rice processing according to claim 2, characterized in that: The water outlet (153) includes a water outlet seat (1531) installed at the lower end of the movable tube (152). The lower end surface of the water outlet seat (1531) is provided with a spherical groove (1532) adapted to the hemispherical protrusion (111), and the inner wall of the spherical groove (1532) is provided with a plurality of nozzles (1533). The interior of the water outlet seat (1531) is provided with 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 a plurality of outlet ends, and the plurality of outlet ends correspond to and are connected to the plurality of nozzles (1533) one by one.

6. The rice surface polishing device for rice processing according to claim 5, characterized in that: The water flow channel (1534) is arc-shaped and is arranged concentrically with the spherical groove (1532); a plurality of nozzles (1533) are arranged in an arc on the top wall of the spherical groove (1532) and are connected to the water flow channel (1534).

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

8. The rice surface polishing device for rice processing according to claim 1, characterized in that: The side wall of the polishing box (2) is provided with a scraper (18), the front end of the scraper (18) extends obliquely upward and abuts against the outer wall of the polishing roller (11), and the front end of the scraper (18) is provided with a semicircular groove (184) that matches and corresponds to the hemispherical protrusion (111), and a movable plate (182) that can be retracted into the scraper (18) is provided in the semicircular 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 semicircular groove (184), and 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 surface of the scraper (18) and the semicircular groove (184).

9. The rice surface polishing device for rice processing according to claim 8, characterized in that: The scraper (18) includes a scraper body (181) mounted on the side wall of the polishing box (2). A telescopic cavity (183) adapted to the movable plate (182) is provided inside the front end of the scraper body (181). A semicircular groove (184) is provided at the front end opening of the telescopic cavity (183) and is passed through from top to bottom. 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 member.

10. The rice surface polishing device for rice processing according to any one of claims 1 to 9, characterized in that: An air inlet pipe (9) is installed on one end face of the dust removal box (1) close to the feed hopper (3), and a fan (7) is installed inside the air inlet pipe (9) through a mounting frame. An exhaust pipe (8) connected to the dust collecting device 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 stabilizing frame 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, so that a dust removal air duct connecting the exhaust pipe (8) and the air inlet pipe (9) is formed in the central channel of the spiral blade (6).

Images