Circulating system of rice mill

Abstract

The utility model belongs to the technical field of food machinery, and particularly relates to a circulating system of a rice mill, which comprises a feed bin, a milling bin, a buffer bin, a milling mechanism and a driving device, and the driving device is used for driving the milling mechanism to rotate; according to the scheme, the multiple slopes with different gradients are arranged, the buffering bin is arranged, ground grains can stably enter the feeding bin and cannot rush into the bottom of the feeding bin at a time to be mixed with unground grains, and therefore orderly and uniform grinding of the grains is achieved; and the grinding efficiency is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of food machinery technology, specifically relating to a circulation system for a rice milling machine. Background Technology

[0002] Traditional rice milling equipment typically uses a single milling method, making it difficult to achieve the desired milling effect for rice in a single processing step. This can easily lead to excessive pressure or damage, resulting in low milling efficiency and unstable product quality.

[0003] To address this, some existing technologies have proposed equipment that uses a cyclic processing method for milling. For example, Chinese invention patent application number 201710615874.1 provides a rice milling device with retained embryos, including a rice milling chamber, a feed inlet, a discharge outlet, and a circulating feeding device. The feed inlet is located at the top of the rice milling chamber, and the discharge outlet is located on one side of the rice milling chamber. The circulating feeding device includes a first conveying mechanism, a second conveying mechanism, and a third conveying mechanism. The bottom of the first conveying mechanism is also connected to a rotating mechanism.

[0004] The rice milling device described above automates the transfer of rice during multiple milling processes by incorporating a circulating feeding system. However, this solution may have the following shortcomings:

[0005] 1. In order to achieve the grinding effect, a longer grinding channel needs to be designed for the processing.

[0006] 2. Uneven milling may occur, for example, some rice grains may remain in the milling chamber and not participate in the circulation.

[0007] Therefore, how to achieve cyclic grinding while ensuring grinding effect remains a problem to be solved. Utility Model Content

[0008] The purpose of this invention is to provide a circulation system for a rice milling machine to partially alleviate or solve the above-mentioned problems and improve the efficiency of circulating milling.

[0009] To solve the aforementioned technical problems, the present invention specifically adopts the following technical solution:

[0010] It includes a feeding hopper, a grinding hopper, a buffer hopper, a grinding mechanism, and a driving device, wherein the driving device is used to drive the grinding mechanism to rotate;

[0011] The top of the feeding hopper is provided with an opening, and the inside of the feeding hopper is provided with a first inclined surface and a second inclined surface. A grain outlet is provided at the connection between the first inclined surface and the second inclined surface.

[0012] The grinding mechanism is located inside the grinding chamber. The grinding chamber has an inlet and an outlet that correspond to the feed end and discharge end of the grinding mechanism, respectively. The feed inlet is connected to the grain outlet.

[0013] The bottom of the buffer chamber is provided with a buffer inlet corresponding to the discharge port, and the buffer chamber is also provided with a buffer outlet corresponding to the second inclined surface. The buffer outlet is connected to the feed chamber, and a third inclined surface is provided inside the buffer chamber.

[0014] The grinding mechanism includes a transport section, a preliminary grinding section and a secondary grinding section arranged sequentially from the feed end to the discharge end. The transport section is provided with a spiral transport trough in the circumferential direction. The preliminary grinding section is provided with a plurality of first rice grinding troughs in the circumferential direction. The secondary grinding section is provided with a plurality of second rice grinding troughs in the circumferential direction.

[0015] As an improvement, the spiral angles of the spiral transport trough, the second rice milling trough, and the first rice milling trough are successively reduced.

[0016] As an improvement, the depths of the spiral conveying trough, the second rice milling trough, and the first rice milling trough are decreased sequentially.

[0017] As an improvement, the included angles between the first inclined plane, the second inclined plane, the third inclined plane, the grinding mechanism and the horizontal plane are α1, α2, α3 and α4, respectively; α1 ranges from 45° to 90°, α2 satisfies tan α2>u and α2<α1, u is the friction coefficient of the second inclined plane, α3 ranges from 50° to 70°, and α4 ranges from 20° to 40°.

[0018] As an improvement, the feed hopper includes a discharge area and a waiting area, with the grain outlet and at least a portion of the first inclined plane located in the discharge area, and the second inclined plane located in the waiting area;

[0019] During the grinding process, the grain located in the discharge zone first enters the grain outlet and flows out. At the same time, some grain in the waiting zone is added to the surface of the grain in the discharge zone to wait for grinding.

[0020] As an improvement, the feed inlet is located on the side wall of the grinding chamber near the feed chamber, and the discharge outlet is located on the top of the grinding chamber and coaxial with the axis of the grinding mechanism.

[0021] As an improvement, the first end of the grinding chamber is provided with a temporary storage chamber corresponding to the feed inlet, and at least a portion of the transport section is located in the temporary storage chamber.

[0022] As an improvement, the pitch of the spiral transport groove is 4mm-5mm.

[0023] As an improvement, a buffer ramp is provided at the buffer outlet, and the acute angle γ between the buffer ramp and the second ramp is in the range of 10°-30°.

[0024] As an improvement, the angle α4 between the axial direction of the grinding mechanism and the horizontal plane is 30°.

[0025] The principle and beneficial technical effects of this utility model are as follows:

[0026] Working principle: During the grinding process, the grain in the grinding bin first enters the grain outlet along the first inclined plane and then enters the grinding bin through the feed inlet for grinding. During grinding, the grain first enters the preliminary grinding section through the transport section for initial grinding to remove larger chaff. Then, it enters the secondary grinding section for secondary grinding. After grinding, the grain enters the buffer bin through the buffer inlet. As the amount of grain in the buffer bin increases, the grain gradually moves upward along the third inclined plane and eventually overflows from the buffer outlet. The overflowing grain returns to the grain bin along the second inclined plane to wait for the next grinding, thus realizing cyclic grinding.

[0027] Beneficial effects: This application proposes a scheme for "orderly grinding" of grains, which can prevent rice from getting stuck during the grinding process while ensuring that the rice grains are ground evenly.

[0028] First, this application employs multiple inclined surfaces in coordination. Initially, two inclined surfaces with different inclinations are set in the feeding hopper. Grains located in the discharge area (i.e., the area near the first inclined surface) can first enter the grinding area along the first inclined surface with a larger inclination. Then, the grains enter the grinding mechanism, which also has a certain inclination, for grinding. After grinding, the grains enter the buffer hopper for buffering. Grains entering the buffer hopper subsequently drive the grains that entered the buffer hopper earlier to move from bottom to top along the third inclined surface and are gradually pushed out of the buffer hopper. At this time, the grains always move sequentially from bottom to top. Subsequently, grains returning to the feeding hopper from the buffer outlet, under their own gravity, slowly slide down the second inclined surface with a smaller inclination. The setting of the second inclined surface allows the grains to enter the grain silo and accumulate on the surface of un-ground (or un-ground in the current cycle) grains, i.e., the waiting area in this paper, and gradually move to the feeding area as the grains in the feeding area gradually decrease.

[0029] In other words, this solution, by reasonably differentiating the inclination of the first and second inclined planes and setting up a buffer hopper, allows the milled grains to enter the feeding hopper smoothly, rather than rushing into the bottom of the feeding hopper and mixing with the unmilled grains, thereby achieving orderly and uniform milling of the grains.

[0030] During the milling process, as the grain enters the first milling trough through the spiral conveyor trough, the deeper spiral conveyor trough can hold more grain, ensuring that there is always a sufficient amount of grain entering the first milling trough to guarantee milling efficiency. Furthermore, the grain is initially milled through the first milling trough, which has a smaller spiral angle and shallower depth, and then quickly enters the second milling trough, where it undergoes secondary milling at a relatively deeper depth. This "two-stage" milling process significantly improves milling efficiency.

[0031] In summary, this application provides a highly efficient circulating grinding mechanism to prevent calorie loss, effectively improving grinding efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0033] Figure 1 This is a three-dimensional structural diagram of the circulating rice milling machine in the embodiments of this utility model;

[0034] Figure 2 This is a front view of the circulating rice milling machine in an embodiment of this utility model;

[0035] Figure 3 This is a top view of the circulating rice milling machine in an embodiment of this utility model;

[0036] Figure 4 This is a side view of the circulating rice milling machine in an embodiment of this utility model;

[0037] Figure 5 This is a cross-sectional view of the circulating rice milling machine in an embodiment of this utility model;

[0038] Figure 6 This is a schematic diagram of the partitioning of the feed hopper in an embodiment of this utility model;

[0039] Figure 7 This is a schematic diagram showing the angle settings of each component in an embodiment of this utility model;

[0040] Figure 8 This is a schematic diagram of the grinding mechanism in an embodiment of this utility model.

[0041] Markings in the diagram: 1. Frame; 2. Drive unit; 3. Feed hopper; 301. First inclined plane; 302. Second inclined plane; 303. Grain outlet; 304. Discharge area; 305. Waiting area; 306. Opening; 307. First connecting surface; 308. Second connecting surface; 4. Grinding hopper; 401. Feed inlet; 402. Discharge outlet; 403. Temporary storage room; 5. Buffer hopper / storage space; 501. Buffer outlet; 5 02. Third inclined plane; 503. Buffer inclined plane; 6. Grinding mechanism; 601. Transport section; 6011. Spiral transport trough; 602. Preliminary grinding section; 6021. First rice milling trough; 603. Secondary grinding section; 6031. Second rice milling trough; 7. Collection area; 701. Rice bran collection box; 702. Grain collection box; 8. Support module; 801. First support block; 802. Second support block; 9. Sensor. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0043] In this document, suffixes such as "module," "component," or "unit" used to denote elements are used solely for the purpose of illustrative purposes and have no specific meaning in themselves. Therefore, "module," "component," or "unit" can be used interchangeably. In this document, terms such as "upper," "lower," "inner," "outer," "front," "rear," "one end," and "the other end," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In this document, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In this document, "multiple" means two or more, that is, it includes two, three, four, five, etc.

[0045] Example 1

[0046] This embodiment is basically as follows: Figures 1-8 As shown:

[0047] See Figure 1 This utility model provides a circulating rice milling machine, including a frame 1, and a drive device, a feeding bin 3, a grinding bin 4, and a buffer bin 5 respectively disposed on the frame 1. The frame 1 serves as the framework structure of the rice milling machine, providing support and connection for the other components.

[0048] The feed hopper, grinding hopper, buffer hopper, grinding mechanism, and drive equipment are collectively referred to as the circulation system in this application.

[0049] See Figure 2 Both the grinding chamber 4 and the buffer chamber 5 are inclined. The feeding chamber 3 and the grinding chamber are connected and fixed by a support module. That is, by setting the support module, the gap between the bottom of the feeding chamber and the top of the grinding chamber is filled, thereby preventing the feeding chamber from becoming loose or tilted.

[0050] In some embodiments, the support module 8 includes a first support block 801 disposed between the feed bin 3 and the grinding bin 4, and a second support block 802 disposed between the feed bin 3 and the frame 1. The first support block 801 and the second support block 802 are in contact with the second inclined surface and the first inclined surface, respectively. Through the cooperation of the first support block 801 and the second support block 802, both sides of the feed bin 3 are effectively supported, which can further prevent the feed bin from loosening or tilting, thereby making the equipment more stable.

[0051] See Figure 1 and Figure 3 The top of the feeding hopper 3 is provided with an opening 306 for adding raw materials (such as rice) into the feeding hopper 3 through the opening 306 before rice milling. The inside of the feeding hopper 3 is provided with a first inclined surface 301 and a second inclined surface 302. A grain outlet 303 is provided at the connection between the first inclined surface 301 and the second inclined surface 302. The grain outlet 303 is located at the bottom of the feeding hopper 3.

[0052] In some embodiments, the feed hopper is funnel-shaped, and both the first and second inclined surfaces can be curved surfaces, with the two curved surfaces enclosing the funnel-shaped feed hopper; wherein, the angle between the curved surface and the horizontal plane refers to the angle between the line connecting any point on the top edge of the curved surface and the center of the grain outlet and the horizontal plane.

[0053] In other embodiments, the feed hopper may also be irregularly shaped, such as flared, see [link to previous embodiment]. Figure 3 The second inclined surface is arranged opposite to the first inclined surface, and the first and second inclined surfaces are connected by two oppositely arranged inclined surfaces (e.g., the first connecting surface 307 and the second connecting surface 308). The inclination angle of the first connecting surface 307 and the second connecting surface 308 is 40-60° (preferably 60°). At this time, the angle between the first and second inclined surfaces and the horizontal plane refers to the angle between the inclined line formed on the first and second inclined surfaces and the horizontal plane with the vertical plane where the center point of the grain outlet is located as the cross section (longitudinal cross section).

[0054] In some specific embodiments, the first inclined plane is composed of three prismatic inclined planes, wherein the angle between the middle prismatic inclined plane and the horizontal plane is the angle between the first inclined plane and the horizontal plane mentioned above, and the inclination angle of the other two prismatic inclined planes is 40-60° (preferably 47.5°).

[0055] In some embodiments, see Figure 6 The feed hopper can be divided into a discharge zone 304 and a waiting zone 305. The grain outlet and at least a portion of the first inclined surface are located in the discharge zone 304, and the second inclined surface is located in the waiting zone 305. During the grinding process, the grain located in the discharge zone first enters the grain outlet and flows out. At the same time, some grain from the waiting zone replenishes the surface of the grain in the discharge zone, waiting for grinding.

[0056] It should be noted that the diagram has been simplified for the purpose of describing the discharge area and the waiting area. It is understandable that the shape of the grain pile will vary depending on the amount of grain in the feed hopper. In this case, the shapes of the discharge area and the waiting area can also change dynamically.

[0057] See Figure 5 The circulating rice milling machine also includes a milling mechanism 6, which is disposed in the milling chamber. The milling chamber is provided with an inlet 401 and an outlet 402 that correspond to the inlet and outlet of the milling mechanism, respectively. The inlet 401 corresponds to the grain outlet. The driving device 2 is used to drive the milling mechanism.

[0058] In some embodiments, see Figure 8The grinding mechanism includes a transport section 601, a preliminary grinding section 602, and a secondary grinding section 603 arranged sequentially from the feed end to the discharge end;

[0059] The transport section 601 is provided with a spiral transport trough 6011 along the circumference, the preliminary grinding section 602 is provided with a plurality of first rice grinding troughs 6021 along the circumference, and the secondary grinding section 603 is provided with a plurality of second rice grinding troughs 6031 along the circumference. The spiral angles of the spiral transport trough 6011, the second rice grinding troughs 6031 and the first rice grinding troughs 6021 decrease sequentially.

[0060] In some embodiments, the pitch of the spiral transport trough 6011 is 4mm-5mm (preferably 4.767mm). By limiting the pitch of the spiral transport trough 6011, the grains can be transported in the form of "single strands" when they enter the transport trough. That is, the grains will not accumulate too much in the same part of the spiral transport trough, thereby ensuring that the grains can be transported smoothly and in an orderly manner.

[0061] In some embodiments, the depths of the spiral transport trough 6011, the second rice milling trough 6031, and the first rice milling trough 6021 decrease sequentially.

[0062] By setting up a rice milling mechanism with the above structure, firstly, during the process of the grain entering the first rice milling trough through the spiral conveyor trough, the deeper spiral conveyor trough can hold a sufficient amount of grain, ensuring that there is always a sufficient amount of grain entering the first rice milling trough to ensure milling efficiency; furthermore, the grain is initially milled through the first milling trough with a smaller spiral angle and a smaller depth and then quickly enters the second milling trough, and then enters the relatively deeper second milling trough for secondary milling, that is, through "two-stage" milling, the milling efficiency can be greatly improved.

[0063] See Figure 5 The buffer silo has a buffer inlet at its bottom corresponding to the discharge port 402, and a buffer outlet 501 corresponding to the second inclined surface. The buffer outlet 501 is connected to the feed silo 3, and a third inclined surface is provided inside the buffer silo 5. The design of the buffer silo effectively solves the problem of uneven grain conveying flow or instantaneous blockage, providing a stable material supply for subsequent recycling processing.

[0064] In other words, a third inclined surface is provided on the frame, and the third inclined surface, together with the top of the grinding chamber and the second inclined surface, forms a storage space (i.e., the buffer chamber mentioned above); the storage space is connected to the grinding chamber and the feed chamber through the discharge port and the buffer outlet, respectively. In this case, the buffer outlet can also be provided on the second inclined surface.

[0065] In some embodiments, the feed inlet is located on the side wall of the grinding chamber near the feed chamber, and the discharge outlet is located at the top of the grinding chamber and coaxial with the axis of the grinding mechanism. Here, "top of the grinding chamber" refers to the highest part of the inclined grinding chamber in this embodiment. Figure 5 The leftmost part of the middle.

[0066] In some embodiments, the feed inlet is perpendicular to the axial direction of the grinding mechanism, and the discharge outlet is coaxial with the axial direction of the grinding mechanism. Correspondingly, the buffer inlet is parallel to the discharge outlet, the buffer outlet is parallel to the second inclined plane, and the buffer outlet is located obliquely above the buffer inlet. This allows grain entering the buffer bin from the buffer inlet to move obliquely upward along the third inclined plane under the pushing action of continuously entering grain in the buffer bin, and to be pushed out from the buffer outlet into the feed bin. In addition, the feed inlet is vertically arranged, allowing grain entering the grinding bin through the feed inlet to enter the spiral conveyor trough circumferentially arranged in the conveying section more directly, further improving grinding efficiency.

[0067] In some embodiments, see Figure 6 The buffer chamber is equipped with a sensor 9 to identify the current degree of grinding. The user can decide whether to continue the grinding cycle based on the data identified and fed back by the sensor 9.

[0068] In some embodiments, see continue to see Figure 5 The first end of the grinding chamber is provided with a temporary storage chamber 403 corresponding to the feed inlet 401. At least a portion of the feed end of the grinding mechanism 6 is located in the temporary storage chamber 403 to transport a small amount of temporarily stored grain in the temporary storage chamber 403 to the grinding end. Specifically, the grain in the feed chamber enters the temporary storage chamber sequentially through the grain outlet and the feed inlet. At this time, the temporary storage chamber can store a small amount of grain, and the grain in the storage chamber is sufficient to basically fill the feed end of the grinding mechanism, thereby preventing the problem of reduced grinding efficiency due to insufficient grain entering the feed end.

[0069] In some embodiments, the driving device is a drive motor. The output shaft of the drive motor is connected to the feed end of the rice milling mechanism and is used to drive the drive mechanism to rotate.

[0070] In some embodiments, the included angles between the first inclined plane, the second inclined plane, the third inclined plane, the grinding mechanism and the horizontal plane are α1, α2, α3 and α4, respectively; α1 ranges from 45° to 90° (preferably 47°), α2 satisfies tan α2>u (preferably 35°) and α2<α1, u is the friction coefficient of the second inclined plane, α3 ranges from 50° to 70° (preferably 60°), and α4 ranges from 20° to 40° (preferably 28°).

[0071] To further verify the reliability of the above-mentioned angle settings, this utility model was tested experimentally. The specific verification results are as follows, see Table 1, the correspondence between different angle settings and grinding effects:

[0072]

[0073] Table 1

[0074] Therefore, the selection of angles for each part is crucial. This solution verifies the above angles respectively, further verifying the rationality and reliability of the angle settings for each part in this solution.

[0075] In some embodiments, see Figure 7 A buffer ramp 503 is provided at the buffer outlet, and the acute angle γ between the buffer ramp 503 and the second ramp 302 ranges from 10° to 30°. That is, the inclination angle of the buffer ramp relative to the horizontal plane is smaller than that of the second ramp relative to the horizontal plane, meaning that the second ramp is steeper than the buffer ramp; and the length of the buffer ramp is much shorter than that of the second ramp, so that after the grain enters the buffer outlet from the buffer hopper, the grain can smoothly pass through the shorter buffer ramp and slide into the bottom of the feed hopper through the relatively longer second ramp.

[0076] In some embodiments, see Figure 1 The bottom of the milling chamber 4 is equipped with a screen (not shown in the figure, which allows bran and bran powder to pass through, but not enough for rice to pass through). The circulating rice milling machine also includes a collection area 7, which is located below the milling chamber 4. The collection area is equipped with a rice bran collection port and a grain collection port. The rice bran collection port corresponds to the screen, and the grain collection port corresponds to the feed end of the milling mechanism.

[0077] In some specific embodiments, the bottom of the temporary storage chamber is provided with a rice outlet, and a sealing door is provided at the rice outlet. During the rice milling process, the sealing door is in a closed state to block the rice outlet.

[0078] In some embodiments, the collection area is provided with a rice bran collection box and a grain collection box arranged sequentially from top to bottom. The rice bran collection box corresponds to the rice bran collection port, and the grain collection box corresponds to the grain collection port. That is, the rice bran collection box and the grain collection box are arranged in a stacked manner, and each is independent. For example, when the rice bran collection box is full of rice bran, the rice bran collection box can be removed and cleaned separately; when the amount of rice bran in the rice bran collection box is small, there is no need to clean it, and the user can simply remove the grain from the grain collection box separately.

[0079] In the operation of the circulating rice milling machine with the above structure, the grain in the feed hopper first enters the storage chamber of the milling hopper through the grain outlet and feed inlet. The transport section located in the storage chamber transports the grain in the storage chamber to the initial milling section for milling in a fixed quantity (at this time, during the transport process, there is always a small amount of grain in the storage chamber). The initial milling section peels the larger bran off the grain while transporting the peeled grain to the secondary milling section for secondary milling. The grain after secondary milling enters the buffer hopper from the discharge end of the rice milling mechanism through the buffer inlet. As the grain in the buffer hopper gradually increases, the grain moves upward along the third inclined plane. When the buffer hopper is full of grain, the grain that first entered the buffer hopper will overflow from the buffer outlet under the push of the subsequent grain, and then slide down the second inclined plane into the feed hopper to enter the next round of milling. The above steps are repeated to achieve multiple millings to mill the grain to the ideal "whiteness".

[0080] During the milling process, bran and bran powder leak out through the filter screen located below the milling mechanism and are collected in the rice bran collection box. After milling is completed, the milled grain can flow out of the temporary storage chamber and into the grain collection box by opening the sealing door below the temporary storage chamber.

[0081] In summary, this application proposes a scheme for "orderly grinding" of grains, which can prevent rice jamming during the grinding process while ensuring that the rice grains are ground evenly.

[0082] Specifically, this application employs multiple inclined surfaces in coordination. First, two inclined surfaces with different inclinations are set in the feeding hopper. Grains located in the discharge area (i.e., the area near the first inclined surface) can first enter the grinding area along the first inclined surface with a larger inclination. Then, the grains enter the grinding mechanism with a certain inclination for grinding. During this process, the grains are quantitatively transported to the grinding section by the transport section for orderly grinding. After grinding, the grains enter the buffer hopper for buffering. Grains entering the buffer hopper subsequently drive the grains to move from bottom to top along the third inclined surface and are gradually pushed out of the buffer hopper. At this time, the grains always move from bottom to top in sequence. Subsequently, the grains returning to the feeding hopper from the buffer outlet slowly slide down the second inclined surface with a smaller inclination under their own gravity. The setting of the second inclined surface allows the grains to enter the feeding hopper and accumulate on the surface of the un-grinded (or not yet ground in the current cycle) grains, i.e., the waiting area in this document, and gradually move to the feeding area as the grains in the feeding area gradually decrease.

[0083] In other words, this solution, by reasonably differentiating the inclination of the first and second inclined planes and setting up a buffer hopper, allows the milled grains to enter the feed hopper smoothly, rather than rushing into the bottom of the feed hopper and mixing with the unmilled grains, thereby achieving orderly and uniform milling of the grains.

[0084] Furthermore, the various bins in this application adopt an integrated design, that is, by arranging multiple bins together in a reasonable position to form a circulation system, the length of the grinding channel required for grain processing is greatly shortened, enabling the system to achieve multiple cycles of grinding in a compact space. At the same time, with the grinding mechanism having a "two-stage" grinding structure, the grinding effect can be further improved, thereby reducing the equipment footprint while improving processing efficiency and ensuring that the rice gradually reaches the ideal grinding effect in each cycle.

[0085] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0086] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A circulation system for a rice milling machine, characterized in that, It includes a feeding bin (3), a grinding bin (4), a buffer bin (5), a grinding mechanism (6), and a driving device (2), wherein the driving device (2) is used to drive the grinding mechanism (6) to rotate; The top of the feeding hopper (3) is provided with an opening (306), and the inside of the feeding hopper (3) is provided with a first inclined surface (301) and a second inclined surface (302). A grain outlet (303) is provided at the connection between the first inclined surface (301) and the second inclined surface (302). The grinding mechanism (6) is located inside the grinding chamber (4). The grinding chamber (4) is provided with a feed inlet (401) and a discharge outlet (402) corresponding to the feed end and discharge end of the grinding mechanism (6), respectively. The feed inlet (401) is connected to the grain outlet (303). The bottom of the buffer chamber (5) is provided with a buffer inlet corresponding to the discharge port (402), and the buffer chamber (5) is also provided with a buffer outlet (501) corresponding to the second inclined surface (302). The buffer outlet (501) is connected to the feed chamber (3), and the buffer chamber (5) is provided with a third inclined surface (502). The milling mechanism (6) includes a transport section (601), a preliminary milling section (602), and a secondary milling section (603) arranged sequentially from the feed end to the discharge end. The transport section (601) is provided with a spiral transport trough (6011) in the circumferential direction. The preliminary milling section (602) is provided with a plurality of first milling troughs (6021) in the circumferential direction. The secondary milling section (603) is provided with a plurality of second milling troughs (6031) in the circumferential direction.

2. The cyclic system according to claim 1, characterized in that, The spiral angles of the spiral transport trough (6011), the second rice milling trough (6031), and the first rice milling trough (6021) decrease sequentially.

3. The cyclic system according to claim 1, characterized in that, The depths of the spiral transport trough (6011), the second rice milling trough (6031), and the first rice milling trough (6021) decrease sequentially.

4. The cyclic system according to claim 1, characterized in that, The angles between the first inclined plane (301), the second inclined plane (302), the third inclined plane (502), the grinding mechanism (6) and the horizontal plane are α1, α2, α3 and α4, respectively; α1 ranges from 45° to 90°, α2 satisfies tan α2 > u and α2 < α1, u is the friction coefficient of the second inclined plane (302), α3 ranges from 50° to 70°, and α4 ranges from 20° to 40°.

5. The circulating system according to claim 1, characterized in that, The feeding hopper (3) includes a discharge area (304) and a waiting area (305), the grain outlet (303) and at least a portion of the first inclined surface (301) are located in the discharge area (304), and the second inclined surface (302) is located in the waiting area (305). During the grinding process, the grain located in the discharge zone (304) first enters the grain outlet (303) and flows out. At the same time, some grain in the waiting zone (305) is added to the surface of the grain in the discharge zone (304) to wait for grinding.

6. The cyclic system according to claim 1, characterized in that, The feed inlet (401) is located on the side wall of the grinding chamber (4) near the feed chamber (3), and the discharge outlet (402) is located on the top of the grinding chamber (4) and is coaxial with the axis of the grinding mechanism (6).

7. The circulating system according to claim 6, characterized in that, The first end of the grinding chamber (4) is provided with a temporary storage chamber (403) corresponding to the feed inlet (401), and at least a part of the transport section (601) is located in the temporary storage chamber (403).

8. The circulating system according to claim 1, characterized in that, The pitch of the spiral transport groove (6011) is 4mm-5mm.

9. The cyclic system according to claim 1, characterized in that, A buffer ramp (503) is provided at the buffer outlet (501), and the acute angle γ between the buffer ramp (503) and the second ramp (302) is in the range of 10°-30°.

10. The cyclic system according to claim 1, characterized in that, The angle α4 between the axis of the grinding mechanism (6) and the horizontal plane is 30°.

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