A rice milling device and a control method thereof

Abstract

The application discloses a rice milling device and a control method thereof. The device prevents rice from sticking and pre-dries the rice through a heating plate and rotating blades. The rice milling mechanism adopts an elastic milling body to adapt to rice of different particle sizes and reduce the breakage of rice grains. The rice hull and rice separation mechanism uses random airflow combined with negative pressure adsorption to improve the separation efficiency. In addition, the rice drying mechanism controls the hot air intensity through closed-loop feedback of a humidity sensor to avoid over-drying and affect the taste, and can automatically recycle and dry substandard rice. The impurity separation mechanism uses multiple layers of staggered filter plates and parallel air to reliably and efficiently separate rice hulls and sand particles. Then, the vibrating screening mechanism is used to screen broken rice through a specific amplitude to ensure product integrity. Finally, the rice milling mechanism can accurately adjust the gap between the inner rice tooth ring and the inner limiting tooth to control the polishing amount and simultaneously remove powder. Therefore, the rice milling device and the control method thereof improve the degree of rice processing automation, product quality and processing stability.

Description

Technical Field

[0002] This invention relates to the field of grain processing technology, and in particular to a rice milling device and its control method. Background Technology

[0003] Rice is a staple food in people's lives. After being planted, rice grains are produced and dried to remove excess moisture. Then, they are milled to remove the husk, becoming brown rice. Although brown rice retains the seed coat, bran, germ, and a large proportion of endosperm, its taste is not as good. To improve its commercial value, brown rice is further processed by removing the seed coat and bran, resulting in white rice, which is mainly endosperm.

[0004] Current technology for processing brown rice primarily relies on friction, which makes it difficult to precisely control the polishing process and can easily cause structural breakage in the rice, affecting the finished product's appearance. Meanwhile, automating or continuously processing rice, and optimizing each processing step or corresponding structure, can significantly improve work efficiency and is therefore highly valuable. Summary of the Invention

[0005] The main objective of this invention is to propose a rice milling device and its control method, which aims to optimize the processing structure and steps of rice processing, thereby improving product quality and work efficiency.

[0006] To achieve the above objectives, the present invention provides a rice milling device, comprising: Rice storage facilities used for initial storage of rice and for reducing moisture by stirring; A rice compaction mechanism used for the initial compaction of rice grains; A rice husk and rice separation mechanism used for the initial separation of rice husks and rice grains; Rice drying equipment used for drying rice; An impurity separation mechanism used to completely separate impurities from the inside of rice. Vibrating screening mechanism used to separate rice from high-density impurities; A rice milling mechanism used to adjust the cutting amount and polish the surface of rice.

[0007] Preferably, the rice storage mechanism includes a funnel-shaped structure at the top, a magnetic grid below the funnel-shaped structure, and an electrically controlled valve at the bottom that can control the size of the opening; the inside of the funnel-shaped structure is provided with rotating blades driven by a first drive motor, and a heating plate is provided on the side of the funnel-shaped structure. The rotating blades and the heating plate work together to adjust the looseness of the rice and reduce the internal humidity.

[0008] Preferably, the rice crushing mechanism includes several parallel crushing shafts, which are synchronously driven by a second drive motor. The crushing shaft includes a central shaft located at the center and an elastic crushing body located on the outside. The crushing body has several first through holes circumferentially arranged inside. The rice grains pass downward through the gaps between adjacent crushing shafts, and the surface of the crushing body undergoes slight deformation, so that the rice grains are crushed and separated into husks and rice grains.

[0009] Preferably, the rice husk separation mechanism includes a vertically arranged first channel tube, the side of which is provided with downwardly inclined rice husk adsorption holes, and a negative pressure adsorption channel covering all the rice husk adsorption holes is provided outside the first channel tube, the negative pressure adsorption channel being connected to a negative pressure adsorption device. An installation platform is located at the bottom of the first channel pipe. The first positive pressure vent pipe and the second positive pressure vent pipe are connected to the two sides and the inside of the installation platform, respectively. The vent ends of the first positive pressure vent pipe and the second positive pressure vent pipe extend outward from the first channel pipe and are connected to the corresponding air supply pipes. An upward-facing central shaft is located in the middle of the installation platform. A rotating air outlet shaft is rotatably connected to the outside of the central shaft. The rotating air outlet shaft has a first air outlet pipe and a second air outlet pipe that are not connected and are arranged alternately in the circumferential direction. The surface of the rotating air outlet shaft has several air outlets that are connected to the first air outlet pipe or the second air outlet pipe, respectively. Several air intake grooves are arranged in the circumferential direction at the bottom of the rotating air outlet shaft. Each air intake groove is connected to the first air outlet pipe or the second air outlet pipe, and the depth of the air intake grooves gradually increases as they approach the corresponding air outlet pipe.

[0010] Preferably, the inner diameter of the first positive pressure vent pipe and the pressure of the gas introduced are not the same as the inner diameter of the second positive pressure vent pipe and the pressure of the gas introduced, and the inner diameter of the first outlet pipe is not the same as the inner diameter of the second outlet pipe.

[0011] Preferably, the rice drying mechanism includes a rice drying shell, a first dispersing blade inside the rice drying shell is driven to rotate by a third drive motor, a disperser is provided below the first dispersing blade to disperse the rice, a second dispersing blade is provided at the bottom of the rice drying shell, the second dispersing blade can bounce the rice upwards, and a hot air fan is provided between the first dispersing blade and the second dispersing blade to dry the rice; a return conveyor is provided on the side of the rice drying shell to return and convey rice that does not meet the humidity range to the top of the rice drying shell for reprocessing.

[0012] Preferably, the impurity separation mechanism includes an impurity separation shell, and the impurity separation shell is provided with a first filter plate, a second filter plate and a third filter plate from top to bottom inside the impurity separation shell, and the filter holes on the surface of the three filter plates are smaller than the maximum length of the rice grains; The three filter plates do not overlap and are arranged from right to left as the first filter plate, the second filter plate, and the third filter plate. There is a gap between adjacent filter plates in the vertical direction. The angle between the three filter plates and the horizontal plane gradually decreases from top to bottom. Below the impurity separation shell, there is also an inclined vibrating screen plate. A long spring is provided on one side of the bottom of the vibrating screen plate, and the other end is connected to a short spring. One side of the vibrating screen plate is rotatably connected to the first connecting rod. The other end of the first connecting rod is rotatably connected to one end of the second connecting rod. The other end of the second connecting rod is rotatably connected to the fifth motor. The length of the first connecting rod is greater than the length of the second connecting rod.

[0013] Preferably, the rice milling mechanism includes an inner cylinder, a middle cylinder, and an outer cylinder arranged vertically and radially from the inside out. The outer surface of the inner cylinder and the inner surface of the middle cylinder form a processing space for polishing rice. An adsorption space for adsorbing dust generated during rice polishing is formed between the outer surface of the middle cylinder and the inner surface of the outer cylinder. A sixth drive motor is installed at the top of the intermediate cylinder. The drive shaft of the sixth drive motor is connected downward to the upper drive block. A lower drive block is installed below the upper drive block. The upper drive block and the lower drive block are radially limited by staggered protruding teeth. The upper drive block and the lower drive block are elastically supported by an intermediate spring. An adjustment shaft is threaded to the outside of the bottom plate of the intermediate cylinder. The upper end of the adjustment shaft passes through the intermediate cylinder and is rotatably connected to the bottom of the inner cylinder through a tapered roller bearing. The inner cylinder has inner rice milling tooth rings on its middle and lower outer surfaces. The inner rice milling tooth rings consist of several rings with protruding teeth at intervals. There is a certain gap between two adjacent protruding teeth inside the same inner rice milling tooth ring. The inner surface of the middle cylinder has several rings of inner limiting teeth. The cross-section of the inner limiting teeth is trapezoidal, and the axial length of a single inner limiting tooth is less than half the length of the gap between two adjacent inner rice milling tooth rings. The rice cutting size can be adjusted by rotating the adjusting shaft.

[0014] The present invention also proposes a control method for the rice milling device, comprising the following steps; Step S1: The harvested and dried rice is transferred to the funnel-shaped structure inside the rice milling machine. The magnetic grid adsorbs ferromagnetic materials and blocks larger debris. The rice is also stirred by rotating blades and heated by side heating plates to achieve preliminary stirring and reduce the internal moisture of the rice. Step S2: The rice grains enter the rice crushing mechanism one by one and pass through the gaps between multiple crushing shafts. The rice grains are elastically crushed by the crushing shafts, which causes the husks and rice grains to be initially separated. Step S3: After being crushed and separated, the rice husks and rice enter the rice husk and rice separation mechanism at the same time. The two positive pressure air pipes of the mounting platform simultaneously provide air pressure to the rotating air shaft in an inclined manner and drive the rotating air shaft to rotate relative to the mounting platform. The upward-sloping air outlet on the surface of the rotating air shaft blows the rice husks and rice with random air pressure airflow. The negative pressure generating devices on both sides of the rice husk and rice separation mechanism generate negative pressure and adsorb the rice husks into the downward-sloping rice husk adsorption holes, thus initially separating the rice husks and rice. Step S4: After the husks and rice are initially separated, they are conveyed into the rice drying mechanism. The rice is initially dispersed by the first dispersing blades on the first horizontal axis, and then evenly dispersed by the spaced dispersers. Finally, it is rotated and bounced upward by the second dispersing blades at the bottom. Combined with the hot air blown into the middle space of the rice drying mechanism by the hot air blowers on both sides, the rice is dried. The first humidity sensor at the inlet end detects the first humidity value of the rice at the beginning of the first time, and the second humidity sensor at the bottom of the rice drying mechanism detects the second humidity value at the end of the first time. Combined with the humidity change rate in the first time, it is determined whether the drying rate needs to be adjusted and whether to enter the next drying cycle. Step S5: The rice that has been dried and meets the corresponding drying parameter range is conveyed into the impurity separation mechanism. It passes through multiple filter plates arranged from top to bottom and at staggered intervals. A blower is set on the right side inside the impurity separation mechanism. During the falling process, the rice and husks are completely screened and separated. Then, the rice and high-density impurities are screened and separated by the vibration screening mechanism below. Step S7: The screened rice is fed into the rice milling mechanism. The inner cylinder is driven to push the rice downwards. The protruding teeth of the inner milling tooth ring on the surface of the inner cylinder roll and polish the rice. By rotating the shaft to adjust the axial movement, the cutting position of the protruding teeth of the inner milling tooth ring and the distance between the inner limit teeth on the inner side of the middle cylinder are adjusted. During the polishing and cutting process of the rice, the pulverized material generated passes through the gap on the surface of the middle cylinder and is absorbed outwards.

[0015] The technical solution of this invention has the following advantages over the prior art: The rice storage mechanism of this invention uses a heating plate and rotating blades to prevent rice from sticking together and to pre-dry it. The rice milling mechanism uses an elastic milling body to adapt to rice of different particle sizes, reducing rice breakage. The rice-husk separation mechanism utilizes randomly changing pulsating airflow combined with negative pressure adsorption to improve husk-rice separation efficiency. Furthermore, the rice drying mechanism uses a humidity sensor with closed-loop feedback to control the hot air intensity, preventing over-drying that affects taste and automatically circulating and drying substandard rice. The impurity separation mechanism uses multi-layer staggered filter plates and parallel airflow to reliably and efficiently separate husks and sand particles. A vibration screening mechanism then uses specific amplitudes to sieve broken rice, ensuring product integrity. Finally, the rice milling mechanism can precisely adjust the gap between the inner milling tooth ring and the inner limiting tooth to control the polishing amount and simultaneously remove powder. Therefore, the rice milling device and its control method of this invention improve the automation level, finished product quality, and processing stability of rice processing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the rice milling device of the present invention; Figure 2 This is a schematic diagram of the internal structure of rice. Figure 3 for Figure 1 A magnified view of a section at point A in the middle; Figure 4 for Figure 1 A magnified view of a section at point B in the middle; Figure 5 for Figure 1 A magnified view of a section at point C; Figure 6 This is a three-dimensional structural schematic diagram of the rotating exhaust shaft of the present invention; Figure 7 This is a cross-sectional view of the internal structure of the rotating exhaust shaft of the present invention; Figure 8 This is a bottom view of the rotating exhaust shaft of the present invention; Figure 9 This is a schematic diagram of the rice milling mechanism of the present invention.

[0018] Explanation of icon numbers: Rice storage mechanism; 101. Funnel-shaped structure; 102. Electrically controlled valve; 103. Magnetic grid; 104. Side plate; 105. Heating plate; 106. Rotating blades; Rice compaction mechanism; 201, enclosure plate; 202, compaction shaft; 2021, central shaft; 2022, compaction body; 2023, first through hole; 204, compaction teeth; Rice husk and rice separation mechanism; 301, first channel pipe; 302, rice husk adsorption hole; 303, negative pressure adsorption channel; 304, mounting platform; 305, first positive pressure ventilation pipe; 306, second positive pressure ventilation pipe; 307, central shaft of mounting platform; 308, rotating air outlet shaft; 309, first air outlet pipe; 310, second air outlet pipe; 311, air intake groove; 312, air outlet hole; Rice drying mechanism; 401, first conveyor; 402, second conveyor; 403, rice drying shell; 404, third drive motor; 405, first horizontal shaft; 406, first dispersing blade; 407, disperser; 408, second horizontal shaft; 409, second dispersing blade; 4091, hot air blower; 410, first humidity sensor; 411, second humidity sensor; 412, rotary valve; 413, third conveyor; Impurity separation mechanism; 501, impurity separation shell; 502, fourth conveyor; 5021, fifth conveyor; 503, first filter plate; 504, second filter plate; 505, third filter plate; 506, filter hole; 507, included angle space; 508, intermediate partition plate; 509, rice husk collection channel; 510, rice husk collection box; 5011, blower; Vibrating screening mechanism; 601, vibrating screening plate; 602, screening hole; 603, long spring; 604, short spring; 605, first connecting rod; 606, second connecting rod; 607, fifth drive motor; 608, rice collection box; Rice milling mechanism; 701, Inner cylinder; 702, Middle cylinder; 703, Outer cylinder; 704, Middle area; 705, Sixth drive motor; 706, Drive shaft; 707, Upper drive block; 708, Lower drive block; 709, Middle spring; 710, Spiral blade; 711, Inner rice milling gear ring; 712, Inner limit tooth; 7121, Lower side of inner limit tooth; 713, Adjusting shaft; 714, Tapered roller bearing; 715, De-dust hole; 716, De-dust hole outlet; 717, Rice inlet; 718, White rice outlet.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention proposes a rice milling device.

[0022] Please see Figure 1-9 The rice milling device in this embodiment of the invention includes, from top to bottom, a paddy storage mechanism 1, a paddy crushing mechanism 2 for preliminary crushing of paddy, a paddy husk and paddy rice separation mechanism 3 for preliminary separation of paddy husk and paddy rice, a paddy rice drying mechanism 4 for drying paddy rice, an impurity separation mechanism 5 for separating impurities inside paddy rice, a vibration screening mechanism 6 for separating paddy rice from high-density impurities, and a rice milling mechanism 7 for surface polishing of paddy rice.

[0023] The rice storage mechanism 1 of the present invention is located at the top of the entire rice milling device, and the rice storage mechanism is a funnel-shaped structure 101. By setting an electric control valve 102 at the bottom of the funnel-shaped structure 101 to control the size of the opening, the quantity and speed of the rice being conveyed downward can be controlled.

[0024] Preferably, to prevent magnetic materials mixed inside the rice from entering the crushing mechanism below during harvesting, a magnetic grid 103 capable of adsorbing magnetic substances is provided above the electrically controlled valve 102. When the rice moves downward, the magnetic grid 103 can adsorb ferromagnetic substances mixed in the rice or block larger debris.

[0025] Preferably, after harvesting and drying, the rice still retains a certain amount of moisture on its surface or inside. To prevent the rice placed inside the rice storage mechanism 1 from sticking to the side plate 104, heating plates 105 are respectively installed on the exterior of the two inclined side surfaces of the rice storage mechanism 1. By strictly controlling the heating temperature and heating time of the heating plates 105, the rice adhering to the side surface of the rice storage mechanism 1 is heated and its internal moisture is evaporated, thus preventing the rice from sticking. A rotating blade 106 can also be installed inside the rice storage mechanism 1. A first drive motor is installed outside the rice storage mechanism 1, and the drive shaft of the first drive motor passes through the wall plate of the rice storage mechanism 1 and is connected to the rotating blade 106. When the rice inside the rice storage mechanism 1 moves downward, the rotating blade 106 pushes and disperses the rice, making it less likely to clump. Furthermore, the heating function of the heating plates 105 and the stirring function of the rotating blade 106 can work synchronously to initially stir and preheat the rice temporarily stored inside the rice storage mechanism 1, reducing the internal humidity of the temporarily stored rice.

[0026] The rice crushing mechanism 2 is located below the rice storage mechanism 1. By setting narrowed enclosure plates 201 on both sides above the rice crushing mechanism 1, the rice conveyed from top to bottom is crushed by the rice crushing mechanism 2. The rice crushing mechanism 2 includes several horizontally arranged and parallel crushing shafts 202. Each crushing shaft 202 includes a central shaft 2021 located at the center and a crushing body 2022 covering the outside of the central shaft 2021 and having a certain degree of elasticity. The crushing body 2022 can be made of rubber material to make it elastic. The compaction body 2022 includes several circumferentially evenly arranged first through holes 2023 inside, and several compaction teeth 2024 are circumferentially arranged on the outer surface of the compaction body 2022. As two adjacent compaction bodies 2022 rotate relative to each other, the compaction teeth 2024 on the surfaces of the two adjacent compaction bodies 2022 have a certain gap. The rice grains pass through the gap between the two adjacent compaction bodies 2022 and are compacted. In other words, the dried and relatively dry rice grains are compacted, thereby separating the outer husk and the inner grains. Please refer to [link / reference]. Figure 2 Furthermore, the rice obtained after milling includes the complete structure of the seed coat, bran, aleurone layer, endosperm, embryo, and germ. Moreover, because the milling body 2022 of this invention has a certain degree of elasticity and is uniformly provided with several first through holes 2023 in its internal circumference, the rice milling process can adapt to milling rice of different sizes. During the milling process, the interior or surface of the milling body 2022 can undergo slight deformation, making it less likely to cause structural breakage of the rice.

[0027] In addition, the radial coverage of all the rolling shafts 202 is greater than the bottom opening width of the enclosure 201, so that the rice moving from top to bottom can be initially rolled by the rice rolling mechanism 2. In terms of spatial arrangement, the two ends of the central shaft 2021 of all the rolling shafts 202 are supported and rotated by bearings respectively, and one end of the central shaft 2021 of the rolling shaft 202 extends outward and is fixedly connected to a transmission gear. The transmission gears mesh with each other to drive the transmission. Of course, a second drive motor is also required to drive one of the rolling shafts 202, which in turn drives the other rolling shafts 202 to rotate relative to each other.

[0028] After the rice is crushed by the rice crushing mechanism 2, a mixture of rice husks and rice is obtained. This mixture continues to move downwards and passes through the rice husk and rice separation mechanism 3 to separate the rice husks and rice. The rice husk and rice separation mechanism of this invention includes a vertically arranged first channel pipe 301. Several rice husk adsorption holes 302 are respectively arranged on the sides of the first channel pipe 301. The rice husk adsorption holes 302 are gradually inclined downwards from the outside to the inside. Furthermore, a negative pressure adsorption channel 303 is provided outside the first channel pipe 301 to cover the rice husk adsorption holes 302 on each side. The negative pressure adsorption channel 303 and a negative pressure adsorption device, such as a vacuum generator, create a corresponding negative pressure adsorption force inside the negative pressure adsorption channel 303 and the rice husk adsorption holes 302. This force can move the rice husks to both sides and through the rice husk adsorption holes 302 into the negative pressure adsorption channel 303, and then transfer them outwards.

[0029] Meanwhile, a mounting platform 304 is provided in the lower middle part of the first channel pipe 301. The two sides and the interior of the mounting platform 304 are respectively connected to the first positive pressure vent pipe 305 and the second positive pressure vent pipe 306. The vent ends of the first positive pressure vent pipe 305 and the second positive pressure vent pipe 306 extend outward from the first channel pipe 301 and are connected to the corresponding gas supply pipelines, so that the positive pressure gas flowing through the first positive pressure vent pipe 305 and / or the second positive pressure vent pipe 306 passes through the interior of the mounting platform 304 and is transported upward.

[0030] In addition, a vertically positioned central shaft 307 is provided at the center of the mounting platform 304. The central shaft 307 is rotatably connected to a rotating air outlet shaft 308 via bearings. The rotating air outlet shaft 308 contains two first air outlet pipes 309 and two second air outlet pipes 310. The first and second air outlet pipes 309 are alternately arranged circumferentially, and adjacent air outlet pipes are not connected. Please refer to the attached diagram. Figure 1 and Figure 6-8The bottom of the first air outlet pipe 309 and the second air outlet pipe 309 are respectively provided with air intake grooves 3011. The depth of the air intake grooves 3011 gradually increases towards the center of the air outlet pipe to introduce gas into the corresponding air outlet pipe. Different air outlet holes 312 are respectively provided on the surface of the rotating air outlet shaft 308. The air outlet holes 312 with different inner diameters are respectively connected to the first air outlet pipe 309 and the second air outlet pipe 310.

[0031] Preferably, the outlets of the first positive pressure vent pipe 305 and the second positive pressure vent pipe 306 of the present invention are inclined towards the first outlet pipe 309 and the second outlet pipe 310, so that during the process of driving the rotating outlet shaft 308 to discharge air, it can also rotate relative to the central axis 307 of the mounting platform. In addition, a rotatable sealing lip can be provided between the mounting platform 304 and the bottom surface of the rotating outlet shaft 308 to minimize gas leakage between the mounting platform 304 and the rotating outlet shaft 308.

[0032] The inner diameter and gas pressure of the first positive pressure vent pipe 305 in this invention are different from those of the second positive pressure vent pipe 306, and the inner diameters of the first outlet pipe 309 and the second outlet pipe 310 are also different. In practical applications, as the rotating outlet shaft rotates, air may be supplied from the first positive pressure vent pipe 305 to the first outlet pipe 309 or to the second outlet pipe 310, or vice versa. That is, the different air pressure values, different ventilation areas, and different inner diameters of the vent pipes cause the gas ejected from the outlet holes 312 on the surface of the rotating outlet shaft 308 to be random, thus making the direction, wind force, and blowing effect of the air blowing on the rice husks and rice during the falling process random.

[0033] After being crushed and separated as described above, the rice husks and rice grains move downwards. Since the weight of a single rice husk is always less than that of a single rice grain, by setting the rice husk adsorption hole 302 to be inclined downwards and the air outlet to be inclined upwards, and by making the gas sprayed from the surface of the rotating air outlet shaft random, the rice husks at different positions can be pushed to the side. After passing through the rice husk adsorption hole 302 and the negative pressure adsorption channel 303, they are transferred to other collection boxes by negative pressure adsorption, which completes most of the initial separation of rice husks and rice grains.

[0034] Even after initial separation, the rice still contains some husks. The rice is conveyed to the rice drying mechanism 4 via a first conveyor 401 and a second conveyor 402. The rice drying mechanism 4 includes a rice drying shell 403. A horizontally positioned third drive motor 404 is located on the upper part of the rice drying shell 403. The rotating end of the third drive motor 404 is rotatably connected to a first horizontal shaft 405. The surface of the first horizontal shaft 405 is provided with dispersed first dispersing blades 406. When the second conveyor 402 conveys the rice to the top position of the rice drying mechanism 4 and transfers it into the rice drying mechanism 4, the third drive motor 404 drives the first horizontal shaft 405 to rotate, and the first dispersing blades 406 disperse the rice. Below the first dispersing blades 406, there are several spaced-apart dispersers 407. Each disperser 407 includes a left side plate and a right side plate. The top ends of the left and right side plates are connected, while their ends are separated, thus the disperser 407 is generally arrow-shaped. After being dispersed, the rice grains impact the surfaces of the left and right side plates, causing them to bounce randomly and move downwards. Below the disperser 407, several second horizontal shafts 408 are provided. The central axis of the second horizontal shafts is spatially perpendicular to the central axis of the first horizontal shaft 405. Second dispersing blades 409 are evenly distributed circumferentially on the surface of each second horizontal shaft 408. Through an external fourth drive motor and gear meshing, all the second horizontal shafts 408 rotate synchronously, causing the second dispersing blades 409 to push the dispersed, downward-moving rice grains upwards again.

[0035] To further dry the rice, the present invention provides a hot air blower 4091 on both sides of the intermediate space between the disperser 407 and the second horizontal axis 408. The hot air blowers 4091 on both sides blow hot air into the intermediate space to dry the rice that moves downward through the disperser 407 and the rice that bounces upward by the second dispersing blades 409. The dried rice then moves downward along the side walls of the rice drying shell 403 and is collected.

[0036] To ensure that the rice is dried to the specified degree of dryness, the present invention provides a first humidity sensor 410 at the end of the second conveyor 402 and a second humidity sensor 411 at the bottom of the rice drying shell 403. When the rice is dried through the above steps, the first humidity value of the rice is detected by the first humidity sensor 410 at the beginning of the first time period, and the second humidity value of the rice is detected by the second humidity sensor 411 at the end of the first time period. If the rate of humidity reduction is too high and exceeds the threshold during the first time period, the hot air speed and hot air temperature of the hot air blower 409 are controlled to reduce the rate of humidity reduction, thereby preventing the internal humidity of the rice from being too low and affecting the subsequent taste.

[0037] If the rate of humidity reduction is too slow, the rate of humidity reduction is increased by controlling and increasing the hot air speed and temperature of the hot air blower 409. After the second heating period, the humidity of the same batch of rice is detected by the second humidity sensor 411. If the third humidity value of the rice is within the specified humidity range, the rotary valve 412 at the bottom is opened and the rice is conveyed downwards. If the third humidity value of the rice is still greater than the specified humidity range, the rice that does not meet the requirements is conveyed back to the top of the rice drying mechanism 4 by the third conveyor 413, then redispersed by the first dispersing blade 403 and the disperser 407, and rebounded by the second dispersing blade 409, and then heated and dried during the third heating period.

[0038] Preferably, the time value of the second time period is half the time value of the first time period, while the time value of the third time period is determined based on the ratio between the third humidity value and the second humidity value. Specifically, the time value of the third time period is obtained by calculating the difference between the third humidity value and the second humidity value, dividing it by the ratio obtained from the second humidity value, and then multiplying it by the time value of the second time period.

[0039] Even after drying, the rice still contains small amounts of impurities such as husks and sand. The dried rice is then fed downwards into the impurity separation mechanism 5, which includes an impurity separation shell 501. A fourth conveyor 502 and a fifth conveyor 5021 connect the bottom of the rice drying shell 403 to the top of the impurity separation shell 501. Inside the impurity separation shell 501, from top to bottom, are arranged a first filter plate 503, a second filter plate 504, and a third filter plate 505, with a certain gap between them. The surfaces of the three filter plates also have several filter holes 506, allowing different substances to pass through their respective filter plates.

[0040] Specifically, in the vertical direction, the installation heights of the three filter plates from top to bottom are: first filter plate 503, second filter plate 504, and third filter plate 505. In the horizontal direction, the three filter plates from right to left are: first filter plate 503, second filter plate 504, and third filter plate 505. Furthermore, the three filter plates do not intersect spatially; that is, there are gaps between the first filter plate 503 and the second filter plate 504, and between the second filter plate 504 and the third filter plate 505. Additionally, the angles between the three filter plates and the horizontal plane gradually decrease from top to bottom. A blower 5011 is installed on the right side of the impurity separation housing 501, and a blower 506 blows parallel air from right to left.

[0041] With the above structural layout, the air blown by the blower 506, after passing the bottom surface of the first filter plate 503, can pass through more of the filter holes of the first filter plate 503. The lighter rice husks, subjected to greater wind force, move to the left to the second filter plate 504. The second filter plate 504 is flatter than the first filter plate 504, and the third filter plate 505 is flatter than the second filter plate 504, allowing the rice husks to move to the left more slowly. More importantly, the maximum inner diameter of the filter holes 506 on the surfaces of the first filter plate 503, second filter plate 504, and third filter plate 505 is smaller than the maximum length of the rice husks. When the rice husks and rice move towards the filter plates simultaneously, the rice husks are pushed to the left by the parallel wind from the right, and the wind force passing through the three filter plates and the gaps between adjacent filter plates can also penetrate the wind, thereby effectively pushing the rice husks to the left. Even if some of the rice husks fall onto the surface of the filter plate, the rice husks are limited by their size and affected by the wind force passing through the surface of the filter hole 506, so they can move smoothly to the left. The weight of the rice is relatively large compared to the weight of the rice husks, thus ensuring that only the rice passes through the filter plate and no rice husks pass through the filter plate.

[0042] Please see Figure 1 , Figure 5 It should be further explained that, since the top surfaces of the second filter plate 504 and the first filter plate 503 are not parallel to each other, and the width of the angle space 507 between the right side of the top surface of the second filter plate 504 and the bottom surface of the first filter plate 503 gradually narrows from right to left, the airflow delivered from the right side can compress the airflow cross-section when passing through the gap between the first filter plate 503 and the second filter plate 504. The air pressure suddenly increases after passing through the gap, which can improve the ability to clean the chaff on the surface of the second filter plate 504. Similarly, when the airflow passes through the gap between the second filter plate 504 and the third filter plate 505, the compressed airflow can improve the ability to clean the chaff on the surface of the third filter plate 505.

[0043] The impurity separation shell 501 is divided into a husk collection channel 509 by a middle partition 508 in the middle position. A husk collection box 510 is provided below the bottom outlet of the husk collection channel 509. The left end of the third filter plate 505 is higher than the top of the middle partition 508, and the left end of the third filter plate 505 is located directly above the top of the middle partition 508 or partially extends to the left. This allows the husks on the third filter plate 505 to smoothly enter the husk collection channel 509 and then move down along the husk collection channel 509 into the husk collection box 510.

[0044] After the rice husks and rice are fully separated by the impurity separation mechanism 5, since the density of sand, pebbles, and non-ferromagnetic particles is greater than that of rice, a relatively stable sweeping wind cannot blow them towards the rice husk collection channel on the left. A vibrating screening mechanism 6 is provided below, comprising a downwardly inclined vibrating screening plate 601 with several screening holes 602 on its surface. The inner diameter of the screening holes 602 is less than half the maximum length of the rice grain. In practical applications, if rice breaks, it usually includes broken short and long grains, with the short grains being less than half the length of the whole grain. By setting the size of the screening holes 602 to less than half the maximum length of the rice grain, the short grains can be screened out downwards, while the long grains are retained. Furthermore, high-density particles can also move downwards through the screening holes 602.

[0045] Specifically, a long spring 603 is provided on one side of the bottom of the vibrating screening plate 601, and a short spring 604 is provided on the other side of the bottom of the vibrating screening plate 601. The different lengths of the springs make the top surface of the vibrating screening plate 601 form an inclined surface. The bottom side of the vibrating screening plate 601 is rotatably connected to one end of the first connecting rod 605 on one side of the long spring 603. The other end of the first connecting rod 605 is rotatably connected to one end of the second connecting rod 606. The other end of the second connecting rod 606 is rotatably connected to the rotating end of the fifth drive motor 607. The housing of the fifth drive motor 607 is fixedly installed. By making the actual working length of the first link 605 greater than that of the second link 606, the fifth drive motor 607 drives the second link 606, which in turn causes the first link 605 to continuously swing relative to the vibrating screening plate 601. This pulls the side of the vibrating screening plate 601 where the long spring 603 is installed to swing back and forth continuously, thus achieving continuous vibration of the vibrating screening plate 601. In this way, high-density particles (such as sand and metal particles) and short rice are screened and removed by the vibrating screening plate 601, leaving only whole-length rice and long rice that slide down the vibrating screening plate 601 into the corresponding rice collection box 608. At this point, the rice is actually brown rice, which can be sold or consumed.

[0046] Please see Figure 9To further mill brown rice into white rice, the rice is fed to the rice milling mechanism 7, where the surface of the brown rice (i.e., the aforementioned rice) is polished. The rice milling mechanism 7 includes a vertically arranged inner cylinder 701, a middle cylinder 702, and an outer cylinder 703 arranged radially from the inside out. The intermediate region 704 between the inner cylinder 701 and the middle cylinder 702 is used for rice milling. A sixth drive motor 705 is located at the top of the middle cylinder 702. The drive shaft 706 of the sixth drive motor 705 is connected downwards to an upper drive block 707. A lower drive block 708 is located below the upper drive block 707. The upper drive block 707 and the lower drive block 708 are radially limited by staggered protruding teeth, and are elastically supported by an intermediate spring 709. The upper drive block 707 can radially push the lower drive block 708 to rotate. The upper outer surface of the inner cylinder 701 is provided with spiral blades 710. After rice enters through the rice inlet 717, the spiral blades 710 push the rice downwards. The middle and lower outer surfaces of the inner cylinder 701 are provided with inner milling tooth rings 711, each consisting of several rings with spaced protruding teeth. There is a certain gap between adjacent protruding teeth within the same inner milling tooth ring. The inner surface of the intermediate cylinder 702 is provided with several rings of inner limiting teeth 712. The cross-section of each inner limiting tooth 712 is trapezoidal, and the axial length of a single inner limiting tooth 712 is less than half the length of the gap between two adjacent inner milling tooth rings 711.

[0047] An adjusting shaft 713 is threaded onto the bottom plate of the intermediate cylinder 702. The upper end of the adjusting shaft 713 passes through the intermediate cylinder 702 and is rotatably connected to the bottom of the inner cylinder 701 via a tapered roller bearing 714. The adjusting shaft axially enters the intermediate cylinder 702, pushing the gap between the upper edge of the inner rice milling tooth ring 711 and the lower side surface 7121 of the inner limiting tooth. In actual operation, the two inner rice milling tooth rings 711 and the inner limiting tooth 712 in the middle can form an approximately U-shaped channel for the rice to flow downwards. By adjusting the upward movement of the inner cylinder 701, the gap between the upper edge of the inner rice milling tooth ring 711 and the lower side surface 7121 of the inner limiting tooth can be adjusted, allowing for better adjustment of the polishing amount intruded on the rice surface. The polished rice becomes white rice and is finally output through the white rice outlet 718.

[0048] To absorb the rice powder produced during the rice polishing process, several elongated powder removal holes 715 are provided circumferentially along the axial direction on the surface of the intermediate cylinder 702. Figure 9 The area without cross-sectional lines in the inner intermediate cylinder 702 is a strip-shaped dust removal hole 715, and the dust removal hole outlet 716, which is connected to the vacuum cleaner and extends outward from the intermediate cylinder, is used to absorb and recycle the dust generated during the rice milling process.

[0049] Please see Figure 1-9 This invention also proposes a control method for a rice milling device. First, the harvested and dried rice is transferred to the funnel-shaped structure 101 inside the rice milling mechanism 1. A magnetic grid 103 adsorbs ferromagnetic substances and blocks larger debris. The rice is further agitated by rotating blades 106 and heated by a side heating plate 105, achieving initial stirring and reducing the internal moisture of the rice.

[0050] The rice grains enter the rice crushing mechanism 1 one by one and pass through the gaps between multiple crushing shafts 202. The rice grains are elastically crushed by the crushing shafts 202, causing the husks and rice grains to be initially separated.

[0051] After being crushed and separated, the rice husks and rice simultaneously enter the rice husk and rice separation mechanism 3. The two positive pressure ventilation pipes of the mounting platform simultaneously provide air pressure to the rotating air outlet shaft 308 in an inclined manner and drive the rotating air outlet shaft 308 to rotate relative to the mounting platform 304. The upwardly inclined air outlet holes 312 on the surface of the rotating air outlet shaft 308 blow the rice husks and rice with random air pressure airflow. The negative pressure generating devices on both sides of the rice husk and rice separation mechanism 3 generate negative pressure and adsorb the rice husks into the downwardly inclined rice husk adsorption holes 302, thus initially separating the rice husks and rice.

[0052] After the husks and rice are initially separated, they are conveyed into the rice drying mechanism 4. The rice is initially dispersed by the first dispersing blades 406 of the first horizontal shaft 405, and then evenly dispersed by the spaced dispersers 407. Finally, it is rotated and rebounded upwards by the second dispersing blades 409 at the bottom. Combined with the hot air blown into the middle space of the rice drying mechanism 4 by the hot air blowers 4091 on both sides, the rice is dried. A first humidity sensor 410 at the inlet end detects the first humidity value of the rice at the beginning of the first time period, and a second humidity sensor 411 at the bottom of the rice drying mechanism 4 detects the second humidity value at the end of the first time period. The humidity change rate during the first time period is used to determine whether the drying rate needs to be adjusted and whether to enter the next drying cycle.

[0053] The dried rice, which meets the corresponding drying parameter range, is conveyed into the impurity separation mechanism 5. Multiple filter plates are arranged from top to bottom and at staggered intervals. A blower 5011 is set on the right side inside the impurity separation mechanism 5. During the falling process, the rice and husks are completely screened and separated. Then, the rice and high-density impurities are screened and separated by the vibration screening mechanism 6 below.

[0054] After screening, the rice is fed into the rice milling mechanism 7. The inner cylinder 701 pushes the rice downwards, and the protruding teeth of the inner milling tooth ring 711 on the surface of the inner cylinder 701 perform surface milling and polishing on the rice. By rotating the adjustment shaft 713, the axial movement is adjusted, changing the cutting position of the protruding teeth of the inner milling tooth ring 711 and the distance between it and the surface of the inner limiting teeth 712 on the inner side of the intermediate cylinder 702. During the polishing and cutting process, the pulverized material generated passes through the gaps on the surface of the intermediate cylinder 702 and is absorbed outwards.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A rice milling device, characterized in that, include: Rice storage facilities used for initial storage of rice and for reducing moisture by stirring; A rice compaction mechanism used for the initial compaction of rice grains; A rice husk and rice separation mechanism for the initial separation of rice husks and rice grains; Rice drying equipment used for drying rice; An impurity separation mechanism used to completely separate impurities from the inside of rice grains; Vibrating screening mechanism used to separate rice from high-density impurities; A rice milling mechanism used to adjust the cutting amount and polish the surface of rice.

2. The rice milling device as described in claim 1, characterized in that, The rice storage mechanism includes a funnel-shaped structure at the top, a magnetic grid below the funnel-shaped structure, and an electrically controlled valve at the bottom that can control the size of the opening. Inside the funnel-shaped structure are rotating blades driven by a first drive motor, and a heating plate is provided on the side of the funnel-shaped structure. The rotating blades and the heating plate work together to adjust the looseness of the rice and reduce the internal humidity.

3. The rice milling device as described in claim 1, characterized in that, The rice crushing mechanism includes several parallel crushing shafts, which are synchronously driven by a second drive motor. Each crushing shaft includes a central shaft located at the center and an elastic crushing body located on the outside. The crushing body has several first through holes circumferentially arranged inside. The rice grains pass downward through the gaps between adjacent crushing shafts, and the surface of the crushing body undergoes slight deformation, causing the rice grains to be crushed and separated into husks and rice grains.

4. The rice milling device as described in claim 1, characterized in that, The rice husk separation mechanism includes a vertically arranged first channel tube, with downwardly inclined rice husk adsorption holes on the side of the first channel tube, and a negative pressure adsorption channel covering all the rice husk adsorption holes outside the first channel tube, the negative pressure adsorption channel being connected to a negative pressure adsorption device. An installation platform is located at the bottom of the first channel pipe. The first positive pressure vent pipe and the second positive pressure vent pipe are connected to the two sides and the inside of the installation platform, respectively. The vent ends of the first positive pressure vent pipe and the second positive pressure vent pipe extend outward from the first channel pipe and are connected to the corresponding air supply pipes. An upward-facing central shaft is located in the middle of the installation platform. A rotating air outlet shaft is rotatably connected to the outside of the central shaft. The rotating air outlet shaft has a first air outlet pipe and a second air outlet pipe that are not connected and are arranged alternately in the circumferential direction. The surface of the rotating air outlet shaft has several air outlets that are connected to the first air outlet pipe or the second air outlet pipe, respectively. Several air intake grooves are arranged in the circumferential direction at the bottom of the rotating air outlet shaft. Each air intake groove is connected to the first air outlet pipe or the second air outlet pipe, and the depth of the air intake grooves gradually increases as they approach the corresponding air outlet pipe.

5. The rice milling apparatus as described in claim 4, characterized in that, The inner diameter of the first positive pressure vent pipe and the pressure of the gas introduced are not the same as the inner diameter of the second positive pressure vent pipe and the pressure of the gas introduced, and the inner diameter of the first outlet pipe is not the same as the inner diameter of the second outlet pipe.

6. The rice milling apparatus as described in claim 1, characterized in that, The rice drying mechanism includes a rice drying shell. Inside the rice drying shell, a first dispersing blade is driven to rotate by a third drive motor. Below the first dispersing blade, there are spaced dispersers to disperse the rice. At the bottom of the rice drying shell, there is a second dispersing blade that can bounce the rice upwards. A hot air blower is installed between the first and second dispersing blades to dry the rice. A return conveyor is provided on the side of the rice drying shell to return rice that does not meet the humidity range to the top of the rice drying shell for reprocessing.

7. The rice milling apparatus as described in claim 1, characterized in that, The impurity separation mechanism includes an impurity separation shell, inside which a first filter plate, a second filter plate, and a third filter plate are arranged from top to bottom. The filter holes on the surface of the three filter plates are smaller than the maximum length of the rice grain. The three filter plates do not overlap and are arranged from right to left as the first filter plate, the second filter plate, and the third filter plate. There is a gap between adjacent filter plates in the vertical direction. The angle between the three filter plates and the horizontal plane gradually decreases from top to bottom. Below the impurity separation shell, there is also an inclined vibrating screen plate. A long spring is provided on one side of the bottom of the vibrating screen plate, and the other end is connected to a short spring. One side of the vibrating screen plate is rotatably connected to the first connecting rod. The other end of the first connecting rod is rotatably connected to one end of the second connecting rod. The other end of the second connecting rod is rotatably connected to the fifth motor. The length of the first connecting rod is greater than the length of the second connecting rod.

8. The rice milling apparatus as described in claim 1, characterized in that, The rice milling mechanism includes an inner cylinder, a middle cylinder, and an outer cylinder arranged vertically and radially from the inside out. The outer surface of the inner cylinder and the inner surface of the middle cylinder form a processing space for polishing rice. An adsorption space is formed between the outer surface of the middle cylinder and the inner surface of the outer cylinder for adsorbing dust generated during rice polishing. A sixth drive motor is installed at the top of the intermediate cylinder. The drive shaft of the sixth drive motor is connected downward to the upper drive block. A lower drive block is installed below the upper drive block. The upper drive block and the lower drive block are radially limited by staggered protruding teeth. The upper drive block and the lower drive block are elastically supported by an intermediate spring. An adjustment shaft is threaded to the outside of the bottom plate of the intermediate cylinder. The upper end of the adjustment shaft passes through the intermediate cylinder and is rotatably connected to the bottom of the inner cylinder through a tapered roller bearing. The inner cylinder has inner rice milling tooth rings on its middle and lower outer surfaces. The inner rice milling tooth rings consist of several rings with protruding teeth at intervals. There is a certain gap between two adjacent protruding teeth inside the same inner rice milling tooth ring. The inner surface of the middle cylinder has several rings of inner limiting teeth. The cross-section of the inner limiting teeth is trapezoidal, and the axial length of a single inner limiting tooth is less than half the length of the gap between two adjacent inner rice milling tooth rings. The rice cutting size can be adjusted by rotating the adjusting shaft.

9. A control method for a rice milling apparatus as described in any one of claims 1-8, characterized in that, Includes the following steps; Step S1: The harvested and dried rice is transferred to the funnel-shaped structure inside the rice milling machine. The magnetic grid adsorbs ferromagnetic materials and blocks larger debris. The rice is also stirred by rotating blades and heated by side heating plates to achieve preliminary stirring and reduce the internal moisture of the rice. Step S2: The rice grains enter the rice crushing mechanism one by one and pass through the gaps between multiple crushing shafts. The rice grains are elastically crushed by the crushing shafts, which causes the husks and rice grains to be initially separated. Step S3: After being crushed and separated, the rice husks and rice enter the rice husk and rice separation mechanism at the same time. The two positive pressure air pipes of the mounting platform simultaneously provide air pressure to the rotating air shaft in an inclined manner and drive the rotating air shaft to rotate relative to the mounting platform. The upward-sloping air outlet on the surface of the rotating air shaft blows the rice husks and rice with random air pressure airflow. The negative pressure generating devices on both sides of the rice husk and rice separation mechanism generate negative pressure and adsorb the rice husks into the downward-sloping rice husk adsorption holes, thus initially separating the rice husks and rice. Step S4: After the husks and rice are initially separated, they are conveyed into the rice drying mechanism. The rice is initially dispersed by the first dispersing blades of the first horizontal axis, and then evenly dispersed by the spaced dispersers. Finally, it is rotated and rebounded upward by the second dispersing blades at the bottom. Combined with the hot air blowers on both sides, hot air is blown into the middle space of the rice drying mechanism to dry the rice. By setting a first humidity sensor at the inlet end to detect the first humidity value of the rice at the start time of the first time, and a second humidity sensor at the bottom of the rice drying mechanism to detect the second humidity value at the end time after the first time, the humidity change rate in the first time is combined to determine whether the drying rate needs to be adjusted and whether to enter the next drying cycle. Step S5: The rice that has been dried and meets the corresponding drying parameter range is conveyed into the impurity separation mechanism. It passes through multiple filter plates arranged from top to bottom and at staggered intervals. A blower is set on the right side inside the impurity separation mechanism. During the falling process, the rice and husks are completely screened and separated. Then, the rice and high-density impurities are screened and separated by the vibration screening mechanism below. Step S7: The screened rice is fed into the rice milling mechanism. The inner cylinder is driven to push the rice downwards. The protruding teeth of the inner milling tooth ring on the surface of the inner cylinder roll and polish the rice. By rotating the shaft to adjust the axial movement, the cutting position of the protruding teeth of the inner milling tooth ring and the distance between the inner limit teeth on the inner side of the middle cylinder are adjusted. During the polishing and cutting process of the rice, the pulverized material generated passes through the gap on the surface of the middle cylinder and is absorbed outwards.

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