Closed-loop internal-circulation flour grinding process
By using a closed-loop internal circulation flour milling process, employing segmented milling and multi-point feeding, and combining roller mills, ball mills, and separators, along with optimized airflow regulators, the problems of large footprint and poor bran handling in flour processing equipment have been solved, achieving efficient, low-energy flour production and stable quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU JIDA MASCH MFG CO LTD
- Filing Date
- 2026-02-27
- Publication Date
- 2026-05-15
AI Technical Summary
Existing flour processing technology and equipment are numerous, require a large area, and involve high investment costs. Furthermore, improper bran processing in whole wheat flour results in poor taste.
The closed-loop internal circulation flour milling process is adopted. Through segmented milling, separate sorting and multi-point feeding, roller mills and ball mills are combined with primary, secondary and tertiary separators. The design of the air direction regulator is optimized to improve production capacity and bran processing effect.
It achieves efficient and low-energy flour production, solves the problem of poor taste caused by improper bran processing, produces flour with stable quality, has flexible equipment layout, occupies little space, and has low maintenance costs.
Smart Images
Figure CN122032684A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of flour processing technology, and more specifically, to a closed-loop internal circulation flour milling process. Background Technology
[0002] Conventional flour processing typically employs a long production process of grinding, sieving, and separating, which suffers from drawbacks such as a large number of connected equipment, a large land area required, and high costs for civil engineering and equipment investment. During whole wheat flour production, the complex fiber structure and high hardness of wheat bran (especially the outer layer) can result in a noticeable "gritty" texture in the final product if not properly processed, severely impacting taste and edibility. Although a flour processing technology and system are proposed in Chinese patent CN115337978B, it still relies on traditional sieving modules and fails to fundamentally address the inherent shortcomings of traditional flour processing technologies, such as numerous pieces of equipment and complex processes.
[0003] Therefore, the technical problem to be solved in this application is how to design a flour co-milling process that is simple in process and flexible in layout, so as to achieve high-efficiency and low-energy conventional flour production, effectively solve the problem of bran treatment in whole wheat flour, and meet the needs of large-scale and intensive production. Summary of the Invention
[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0005] To at least partially solve the above problems, the present invention provides a closed-loop internal circulation flour milling process, comprising the following steps: S1: Grinding the raw materials; S2: The ground mixture is sent to the primary separator, which separates primary flour, wheat bran, primary coarse flour and secondary coarse flour. S3: After grinding the secondary coarse powder, it is sent to the secondary separator, which separates the primary powder, wheat bran and tertiary coarse powder. S4: After grinding the third-grade coarse powder, it is sent to the third-grade separator, which separates the second-grade powder and the fourth-grade coarse powder.
[0006] Preferably, step S1 includes: S101: The raw materials are sent to the intermediate silo via the elevator, and the raw materials are mixed in the intermediate silo to form mixed raw materials; S102: Grind the mixed raw materials in the intermediate silo to obtain a primary mixture of primary powder, wheat bran, first-grade coarse powder and second-grade coarse powder.
[0007] Preferably, step S2 includes: S201: The ground primary mixture is sent to the primary separator via an elevator; S202: The primary separator separates the primary coarse powder, secondary coarse powder and secondary mixture from the primary mixture; S203: The primary coarse powder is sent back to the intermediate silo to be mixed with the raw materials to form a mixed raw material. The secondary coarse powder is ground to make a tertiary mixture. The tertiary mixture is sent to the secondary separator. The secondary mixture is sent to the primary grading screen to separate the primary powder and wheat bran.
[0008] Preferably, step S3 includes: S301: The ground tertiary mixture is sent to the secondary separator via an elevator; S302: The secondary separator separates the tertiary coarse powder and the quaternary mixture from the tertiary mixture; S303: After the third-grade coarse powder is ground, it is made into a fifth-grade mixture. The fifth-grade mixture is sent to the third-grade separator, and the fourth-grade mixture is sent to the second-grade grading screen to separate the first-grade powder and wheat bran.
[0009] Preferably, step S4 includes: S401: The five-stage mixture after grinding is sent to the three-stage separator via an elevator; S402: The three-stage separator separates the fourth-stage coarse powder and the second-stage powder from the five-stage mixture.
[0010] Preferably, step S4 further includes: S403: Treat the fourth-grade coarse powder as waste, or mix the fourth-grade coarse powder, the third-grade coarse powder and the wheat bran screened by the second-grade grading screen, grind them to make a fifth-grade mixture, send the fifth-grade mixture to the third-grade separator, and then repeat steps S402 and S403.
[0011] Preferably, in step S203, the wheat bran sieved by the primary grading sieve is mixed and ground with the secondary coarse powder to form a tertiary mixture.
[0012] Preferably, in step S303, the wheat bran sieved by the secondary grading sieve is mixed and ground with the tertiary coarse powder to form a five-stage mixture.
[0013] Preferably, a roller mill is used for grinding in step S1.
[0014] Preferably, a ball mill is used for grinding in steps S2 to S4, and the ball mill is connected to a dust collector.
[0015] Compared with the prior art, the present invention has at least the following beneficial effects: This application employs segmented grinding (grinding is required before entering each stage of the classifier), separate sorting (each stage of the classifier sorts flour of different qualities), and multi-point feeding (first-stage coarse flour is backfilled into the intermediate silo, and fourth-stage coarse flour is supplemented to third-stage coarse flour) to increase production capacity. (The flour classifier with the applicant's prior patent number CN202011128686.4 has the advantages of controllable and adjustable sorting particle size, large single-machine processing capacity (2-500 tons / hour), high fineness of finished flour (100-500 mesh), no external exhaust, low energy consumption, low noise, small size, and low maintenance cost.) Furthermore, the flour classifier with the prior patent number CN202011128686.4 can be applied to each step of this application. If the user's site is limited, only one classifier can be used to operate in stages, thereby achieving the effect of replacing the entire production line with one production device. This application features a simple process and flexible layout. The segmented milling and separate sorting further solve the problem of poor bran processing in existing whole wheat flour, which leads to poor taste. The produced secondary flour has stable quality.
[0016] The closed-loop internal circulation flour milling process described in this invention, along with other advantages, objectives, and features of this invention, will be partly apparent from the following description and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart illustrating the application of the closed-loop internal circulation flour milling process described in this invention to conventional flour processing.
[0018] Figure 2 This is a schematic diagram illustrating the application of the closed-loop internal circulation flour milling process described in this invention to conventional flour processing.
[0019] Figure 3 This is a flowchart illustrating the application of the closed-loop internal circulation flour milling process described in this invention to whole wheat flour processing.
[0020] Figure 4 This is a schematic diagram illustrating the application of the closed-loop internal circulation flour milling process described in this invention to whole wheat flour processing.
[0021] Figure 5 This is a schematic diagram showing the location of the wind direction regulator in the prior application.
[0022] Figure 6 A schematic diagram of a closed air duct for a splitter (the arrows indicate the direction of airflow).
[0023] Figure 7This is a diagram showing the opening of the downwind duct (the arrows indicate the direction of airflow).
[0024] Figure 8 This is a schematic diagram showing that the upper and lower air ducts are open at the same time (the arrows indicate the direction of airflow).
[0025] Figure 9 This is a diagram showing the opening of the upwind duct (the arrows indicate the direction of airflow).
[0026] In the diagram: 1 Three-stage powder separation chamber, 2 Cyclone, 3 Blower, 4 Air direction adjuster, 5 Air guide tube, 6 Divider plate, 7 Diverter, 8 Limiting protrusion, 9 First sealing plate, 10 Second sealing plate, 11 Drive shaft. Detailed Implementation
[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.
[0028] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0029] like Figures 1-9 As shown, the present invention provides a closed-loop internal circulation flour milling process, including the following steps: S1: The raw material is ground using a double roller mill. S2: The ground mixture is sent to the primary separator, which separates primary flour, wheat bran, primary coarse flour and secondary coarse flour. S3: A ball mill connected to a dust collector is used to grind the secondary coarse powder and send it to a secondary separator. The secondary separator separates the primary powder, wheat bran and tertiary coarse powder. S4: A ball mill connected to a dust collector is used to grind the third-grade coarse powder and send it to a third-grade separator. The third-grade separator separates the second-grade powder and the fourth-grade coarse powder.
[0030] Similarly, factories can add or remove equipment and processes based on their site conditions and the required flour processing precision. Furthermore, the flour classifier in this application is preferentially selected from the applicant's earlier patent application with patent number 202011128686.4.
[0031] This application employs segmented grinding (grinding is required before entering each stage of the classifier), separate sorting (each stage of the classifier sorts flour of different qualities), and multi-point feeding (first-stage coarse flour is backfilled into the intermediate silo, and fourth-stage coarse flour is supplemented to third-stage coarse flour) to increase production capacity. (The flour classifier with the applicant's prior patent application number 202011128686.4 has the advantages of controllable and adjustable sorting particle size, large single-machine processing capacity (2-500 tons / hour), high fineness of finished flour (100-500 mesh), no external exhaust, low energy consumption, low noise, small size, and low maintenance cost.) Furthermore, the flour classifier with the prior patent application number 202011128686.4 can be applied to each step of this application. If the user's site is limited, only one classifier can be used to operate in stages, thereby achieving the effect of replacing the entire production line with one production device. This application features a simple process and flexible layout. The segmented milling and separate sorting further solve the problem of poor bran processing in existing whole wheat flour, which leads to poor taste. The produced secondary flour has stable quality. When processing regular flour, such as Figure 1 As shown, this application can be further optimized to the following steps: S101: The raw materials are sent to the intermediate silo via the elevator, and the raw materials are mixed in the intermediate silo to form mixed raw materials; S102: The mixed raw materials in the intermediate silo are ground by a roller mill to obtain a primary mixture of primary powder, wheat bran, first-grade coarse powder and second-grade coarse powder.
[0032] S201: The ground primary mixture is sent to the primary separator via an elevator; S202: The primary separator separates the primary coarse powder, secondary coarse powder and secondary mixture from the primary mixture; S203: The primary coarse powder is sent back to the intermediate silo to be mixed with the raw materials to form a mixed raw material. The secondary coarse powder is ground to make a tertiary mixture. The tertiary mixture is sent to the secondary separator. The secondary mixture is sent to the primary grading screen to separate the primary powder and wheat bran.
[0033] S301: The tertiary mixture after being ground by a ball mill (connected to a dust collector) is sent to a secondary separator via an elevator; S302: The secondary separator separates the tertiary coarse powder and the quaternary mixture from the tertiary mixture; S303: After the third-grade coarse powder is ground, it is made into a fifth-grade mixture. The fifth-grade mixture is sent to the third-grade separator, and the fourth-grade mixture is sent to the second-grade grading screen to separate the first-grade powder and wheat bran.
[0034] S401: The five-stage mixture after being ground by a ball mill (connected to a dust collector) is sent to a three-stage separator via an elevator; S402: The three-stage separator separates the fourth-stage coarse powder and the second-stage powder from the five-stage mixture.
[0035] S403: Treat the fourth-grade coarse powder as waste, or mix and grind the fourth-grade coarse powder with the third-grade coarse powder to make a fifth-grade mixture, and then send the fifth-grade mixture to the third-grade separator, and then repeat steps S402 and S403.
[0036] When this application is applied to the processing of conventional flour, such as Figure 2 As shown, the raw materials first need to pass through the impurity cleaning mechanism made by the applicant to remove impurities from the grain. The cleaned grain is then transported to the intermediate silo by an elevator. After being ground by a roller mill, the grain in the intermediate silo is then transported to the primary separator (preferably the flour separator with the applicant's earlier patent application number 202011128686.4). The fine powder outlet of the primary separator (i.e. the outlet of the secondary mixture) is connected to the primary grading screen, through which primary flour and wheat bran are screened out.
[0037] The two coarse powder outlets of the primary separator (i.e., the primary coarse powder outlet and the secondary coarse powder outlet) are connected to the intermediate bin and the ball mill, respectively. The primary coarse powder conveyed to the intermediate bin is mixed with the raw materials and then sent back to the roller mill for return rolling. After that, it is conveyed back to the primary separator for grading.
[0038] The secondary coarse powder is conveyed to the ball mill for grinding. The ground fine powder (i.e., the tertiary mixture) is conveyed to the secondary separator via an elevator to obtain the quaternary mixture and the tertiary coarse powder. The fine powder outlet of the secondary separator (i.e. the outlet of the quaternary mixture) is connected to the secondary grading screen. The primary powder and wheat bran are screened out by the secondary grading screen. The air outlet of the ball mill is connected to the dust collector, and the outlet of the dust collector is connected to the elevator.
[0039] The third-grade coarse powder is fed into a ball mill for grinding. The ground fine powder (i.e., the fifth-grade mixture) is then conveyed to a third-grade separator via an elevator to obtain finer second-grade powder and fourth-grade coarse powder. The fourth-grade coarse powder can be treated as waste or mixed with the third-grade coarse powder and then ground to produce the fifth-grade mixture. When processing whole wheat flour, such as Figure 3 As shown, this application can be further optimized to the following steps: S101: The raw materials are sent to the intermediate silo via the elevator, and the raw materials are mixed in the intermediate silo to form mixed raw materials; S102: The mixed raw materials in the intermediate silo are ground by a roller mill to obtain a primary mixture of primary powder, wheat bran, first-grade coarse powder and second-grade coarse powder.
[0040] S201: The ground primary mixture is sent to the primary separator via an elevator; S202: The primary separator separates the primary coarse powder, secondary coarse powder and secondary mixture from the primary mixture; S203: The primary coarse powder is sent back to the intermediate silo to be mixed with the raw materials to form a mixed raw material. The secondary mixture is sent to the primary grading screen to separate the primary powder and wheat bran. The wheat bran separated by the primary grading screen is ground with the secondary coarse powder to form a tertiary mixture. The tertiary mixture is sent to the secondary separator.
[0041] S301: The tertiary mixture after being ground by a ball mill (connected to a dust collector) is sent to a secondary separator via an elevator; S302: The secondary separator separates the tertiary coarse powder and the quaternary mixture from the tertiary mixture; S303: The fourth-grade mixture is sent to the second-grade grading screen to separate the first-grade powder and wheat bran. The wheat bran separated by the second-grade grading screen is ground with the third-grade coarse powder to make a fifth-grade mixture. The fifth-grade mixture is sent to the third-grade separator.
[0042] S401: The five-stage mixture after being ground by a ball mill (connected to a dust collector) is sent to a three-stage separator via an elevator; S402: The three-stage separator separates the fourth-stage coarse powder and the second-stage powder from the five-stage mixture.
[0043] S403: Treat the fourth-grade coarse powder as waste, or mix the fourth-grade coarse powder, the third-grade coarse powder and the wheat bran screened by the second-grade grading screen, grind them to make a fifth-grade mixture, send the fifth-grade mixture to the third-grade separator, and then repeat steps S402 and S403.
[0044] When this application is applied to the processing of whole wheat flour, such as Figure 4 As shown, the raw materials first need to pass through the impurity cleaning mechanism made by the applicant to remove impurities from the grain. The cleaned grain is then transported to the intermediate silo by an elevator. After being ground by a roller mill, the grain in the intermediate silo is then transported to the primary separator (preferably the flour separator with the applicant's earlier patent application number 202011128686.4). The fine powder outlet of the primary separator (i.e. the outlet of the secondary mixture) is connected to the primary grading screen, through which primary flour and wheat bran are screened out.
[0045] The two coarse powder outlets of the primary separator (i.e., the primary coarse powder outlet and the secondary coarse powder outlet) are connected to the intermediate bin and the ball mill, respectively. The primary coarse powder conveyed to the intermediate bin is mixed with the raw materials and then sent back to the roller mill for return rolling. After that, it is conveyed back to the primary separator for grading.
[0046] Wheat bran separated by the primary grading screen and secondary coarse powder separated by the separator are sent to the ball mill for grinding. The ground fine powder (i.e., the tertiary mixture) is conveyed to the secondary separator by the elevator to obtain the quaternary mixture and the tertiary coarse powder. The fine powder outlet of the secondary separator (i.e., the outlet of the quaternary mixture) is connected to the secondary grading screen. The primary powder and wheat bran are screened out by the secondary grading screen. The air outlet of the ball mill is connected to the dust collector, and the outlet of the dust collector is connected to the elevator.
[0047] The grade 3 coarse powder and the wheat bran sieved out by the grade 2 grading screen are fed into a ball mill for grinding. The fine powder after grinding (i.e., the grade 5 mixture) is conveyed to a grade 3 separator by an elevator to obtain finer grade 2 powder and grade 4 coarse powder. The grade 4 coarse powder can be treated as waste, or it can be mixed with the grade 3 coarse powder and the wheat bran sieved out by the grade 2 grading screen and then ground to make the grade 5 mixture. It is clear from the foregoing embodiments that, in both conventional flour processing and whole wheat flour processing, only the primary separator utilizes the "three-separation" function of the flour separator with prior patent application number 202011128686.4, which involves separately collecting fine flour (secondary mixture), medium-coarse flour (secondary coarse flour), and coarse flour (primary coarse flour). While the secondary and tertiary separators still preferentially use the flour separator with prior patent application number 202011128686.4, in practical applications, only the conventional "two-separation" function is applied. Although this function can be achieved directly using the cyclone separator 2, adding the cyclone separator 2 would prevent the aforementioned effect of "one device replacing the entire production line" from being achieved.
[0048] The difference between conventional flour processing and whole wheat flour processing lies solely in the handling of bran in the mixture. In conventional flour processing, bran is considered waste, while in whole wheat flour processing, it participates in the entire grinding process. Therefore, in whole wheat flour processing, as much bran as possible needs to be discharged from the coarse flour chute (or semi-coarse flour chute) to reduce the amount of bran entering the grading sieve, thereby increasing the grading efficiency. In conventional flour processing, the goal is to allow as much bran as possible to enter the grading sieve, minimizing bran residue in the coarse flour used for subsequent processing. Regarding the contradictory approaches, if the flour separator with the earlier patent number 202011128686.4 is still used, it will be impossible to achieve the effect of allowing as much wheat bran as possible to be discharged from the coarse flour outlet. That is, the flour separator with the earlier patent number 202011128686.4 can be efficiently applied to the production of conventional flour, but it is less efficient for the production of whole wheat flour because it will result in a larger amount of wheat bran entering the grading screen, reducing the grading screen's screening efficiency.
[0049] Therefore, we need to further optimize the flour separator with the prior patent application number 202011128686.4 so that it can become a dedicated separator applicable to this application. That is, when processing conventional flour, it can send as much bran as possible into the grading screen, and when processing whole wheat flour, it can send as little bran as possible into the grading screen. At the same time, it can be used as a primary separator, or as a secondary or tertiary separator.
[0050] In this embodiment, the primary separator, secondary separator, and tertiary separator still adopt the structure of the air classifier with the prior patent application No. 202011128686.4, which consists of a three-stage separation air classifier 1, a first motor, a second motor, a cyclone 2, and a blower 3. The outlet end of the blower 3 is connected to the three-stage separation air classifier 1, and the inlet end of the blower 3 is connected to the cyclone 2 through a pipeline. The difference is that a wind direction adjuster 4 is provided at the outlet end of the blower 3. The wind direction adjuster 4 can adjust the wind direction blown from the outlet end of the blower 3. The wind direction can be horizontal or have a non-zero angle with the horizontal direction.
[0051] For example, when used as a primary separator, the wind direction is horizontal, allowing the primary separator to achieve the same "three-stage separation" effect as the powder classifier with earlier patent application number 202011128686.4. When used as a secondary or tertiary separator, the wind direction has a non-zero angle with the horizontal direction: When performing conventional flour processing, the airflow is directed towards the coarse flour discharge pipe described in the flour separator with prior patent application number 202011128686.4 (i.e., downwards) to reduce the probability of bran accumulation.
[0052] When processing whole wheat flour, the airflow is directed towards the fine flour discharge pipe (i.e., upwards) as described in the flour separator with prior patent application number 202011128686.4, so that wheat bran can accumulate at the coarse flour discharge pipe, reducing the amount of wheat bran entering the grading screen.
[0053] Through the above structural design, the effect of one device replacing the entire production line can be achieved without increasing the number of cyclones 2. At the same time, by setting the wind direction regulator 4, the wind direction of the secondary and tertiary separators can be switched between conventional flour processing and whole wheat flour processing to ensure processing efficiency. Furthermore, the outlet end of the blower 3 is connected to the inlet end of the airflow regulator 4, and the outlet end of the airflow regulator 4 is connected to the three-way separation classifier 1. All structures and principles of the classifier, except for the airflow regulator 4, are consistent with the classifier in the prior art patent application No. 202011128686.4. The airflow regulator 4 consists of an air guide duct 5, a partition plate 6, and a distributor 7. Both the partition plate 6 and the distributor 7 are located inside the air guide duct 5. The partition plate 6 divides the interior of the air guide duct 5 into an upper airflow channel and a lower airflow channel. The distributor 7 is located on the side of the partition plate 6 near the airflow inlet end of the air guide duct 5. Figure 6 As shown, the splitter 7 passes through the air duct 5 and is connected to the drive motor. The drive motor is used to drive the splitter 7 to rotate. When the air direction adjuster 4 adjusts the air direction, the drive motor drives the splitter 7 to move, so that the air from the blower 3 can flow through the upper air duct and / or the lower air duct. Furthermore, the inner wall of the air guide duct 5 is provided with a limiting protrusion 8, a first slot, a second slot, and a third slot. The limiting protrusion 8 is located at the inner top of the air guide duct 5 and between the air inlet end of the air guide duct 5 and the splitter 7. The first slot is located at the connection between the limiting protrusion 8 and the inner wall of the air guide duct 5 and between the splitter 7 and the limiting protrusion 8. The second slot is located at the inner bottom of the air guide duct 5 and is opposite to the position of the first slot. The third slot is located at the inner bottom of the air guide duct 5 and is located in the lower air duct. Furthermore, the two ends of the partition plate 6 are respectively the windward end and the air supply end. The windward end faces the air inlet of the air guide duct 5, and the air supply end faces the air outlet of the air guide duct 5. Both the windward end and the air supply end are composed of two inclined surfaces. The two inclined surfaces at the windward end are the first inclined surface and the second inclined surface, which are symmetrically arranged. The first inclined surface faces the inner top of the guide duct 5, and the second inclined surface faces the inner bottom of the guide duct 5. After the air from the blower 3 enters through the air inlet of the guide duct 5, it can be guided to the upper air duct through the first inclined surface or to the lower air duct through the second inclined surface.
[0054] The two inclined surfaces of the air supply end are the third inclined surface and the fourth inclined surface, which are symmetrically arranged. The third inclined surface faces the inner top of the air guide duct 5, and the fourth inclined surface faces the inner bottom of the air guide duct 5. The inner top surface of the air guide duct 5 opposite to the third inclined surface is the fifth inclined surface, which is parallel to the third inclined surface. The inner sidewall of the air guide duct 5, the fifth inclined surface, and the third inclined surface together form the upper air outlet of the upper air duct. The inner bottom surface of the air guide duct 5 opposite to the fourth inclined surface is the sixth inclined surface, which is parallel to the fourth inclined surface. The inner sidewall of the air guide duct 5, the sixth inclined surface, and the fourth inclined surface together form the lower air outlet of the lower air duct. The upper air outlet and the lower air outlet are symmetrically arranged.
[0055] When only the upper air duct is outlet, the airflow from the upper air outlet is directed toward the coarse powder discharge pipe described in the prior patent application No. 202011128686.4 (i.e., downwards), reducing the probability of wheat bran accumulation.
[0056] When only the downdraft outlet is exposed, the airflow from the downdraft outlet is directed toward the fine powder discharge pipe (i.e., upwards) described in the flour separator with prior patent application number 202011128686.4, so that wheat bran can accumulate at the coarse powder discharge pipe, reducing the amount of wheat bran entering the grading screen.
[0057] When the upper and lower air ducts discharge air simultaneously, the air flowing from the upper and lower air outlets converges, and the air direction is consistent with the air direction at the outlet end of the blower 3. Furthermore, to achieve the switching between the upper and lower air ducts, the splitter 7 is composed of two sealing plates connected by a reset member. The two sealing plates are a first sealing plate 9 and a second sealing plate 10. A drive shaft 11 is provided on the first sealing plate 9. One end of the drive shaft 11 is connected to the second sealing plate 10 through the reset member, allowing the second sealing plate 10 to rotate around the drive shaft 11. The other end of the drive shaft 11 passes through the air duct 5 and is connected to the drive motor. The reset member can be a torsion spring, which always tends to maintain the included angle between the first sealing plate 9 and the second sealing plate 10 at 180°. That is, under the action of the torsion spring, if no other external force intervenes, the central angle between the first sealing plate 9 and the second sealing plate 10 is 180°. Figure 6 and Figure 7 As shown.
[0058] When the drive motor is not started, the circuit breaker 7 closes the air duct 5, such as Figure 6 As shown, the drive motor keeps the splitter 7 in a state where the first sealing plate 9 abuts against the first slot and the second sealing plate 10 abuts against the third slot (this is the initial state), thereby physically isolating the blower 3 from the three-separation powder classifier 1.
[0059] When the drive motor starts, it drives the first sealing plate 9 to rotate via the transmission shaft 11. Simultaneously, the first sealing plate 9 rotates, driving the second sealing plate 10 to rotate synchronously via the reset component. When the second sealing plate 10 abuts against the second inclined surface, the end of the first sealing plate 9 is located at the lowest point of the limiting protrusion 8. Figure 7 As shown, the lower air duct is fully open at this time, while the upper air duct is still blocked by the first sealing plate 9. After passing through the lower air duct, the air from the blower 3 is guided by the lower air outlet and blows air into the fine powder discharge pipe (i.e., upward) described in the powder classifier with the prior patent application number 202011128686.4.
[0060] As the drive motor continues to rotate, because the second sealing plate 10 has abutted against the second inclined surface, only the first sealing plate 9 will continue to rotate, causing the reset member to be subjected to force. When the first sealing plate 9 rotates to a horizontal state, as... Figure 8 As shown, both the upper and lower air ducts are fully open. At this time, the air flowing out from the upper and lower air outlets converges together, and the air direction is consistent with the air direction at the outlet of the blower 3.
[0061] As the drive motor continues to rotate, the first sealing plate 9 abuts against the second slot, causing the first sealing plate 9 to reach its limit position. At this point, the lower air duct is completely sealed, and the upper air duct is opened. Figure 9 As shown, the air from blower 3, guided by the upper air outlet through the upper air duct, blows air onto the coarse powder discharge pipe (i.e., downward-facing) described in the powder classifier with the prior patent application number 202011128686.4. It should be noted that the new sorting machine formed by optimizing and improving the prior application is a special equipment that can achieve the "one machine for multiple uses" technical effect of this application. Although it is an optimized design of the prior application, the sorting machine solves the technical problems of wind direction adjustment and "one machine for multiple uses" that the prior application could not solve. Therefore, the above-mentioned technical solution that can form the special sorting machine of this application should not be excluded from the protection scope of this application. In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.
[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0063] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A closed-loop internal circulation flour milling process, characterized in that, The steps include the following: S1: Grinding the raw materials; S2: The ground mixture is sent to the primary separator, which separates primary flour, wheat bran, primary coarse flour and secondary coarse flour. S3: After grinding the secondary coarse powder, it is sent to the secondary separator, which separates the primary powder, wheat bran and tertiary coarse powder. S4: After grinding the third-grade coarse powder, it is sent to the third-grade separator, which separates the second-grade powder and the fourth-grade coarse powder.
2. The closed-loop internal circulation flour milling process according to claim 1, characterized in that, Step S1 includes: S101: The raw materials are sent to the intermediate silo via the elevator, and the raw materials are mixed in the intermediate silo to form mixed raw materials; S102: Grind the mixed raw materials in the intermediate silo to obtain a primary mixture of primary powder, wheat bran, first-grade coarse powder and second-grade coarse powder.
3. The closed-loop internal circulation flour milling process according to claim 2, characterized in that, Step S2 includes: S201: The ground primary mixture is sent to the primary separator via an elevator; S202: The primary separator separates the primary coarse powder, secondary coarse powder and secondary mixture from the primary mixture; S203: The primary coarse powder is sent back to the intermediate silo to be mixed with the raw materials to form a mixed raw material. The secondary coarse powder is ground to make a tertiary mixture. The tertiary mixture is sent to the secondary separator. The secondary mixture is sent to the primary grading screen to separate the primary powder and wheat bran.
4. The closed-loop internal circulation flour milling process according to claim 3, characterized in that, Step S3 includes: S301: The ground tertiary mixture is sent to the secondary separator via an elevator; S302: The secondary separator separates the tertiary coarse powder and the quaternary mixture from the tertiary mixture; S303: After the third-grade coarse powder is ground, it is made into a fifth-grade mixture. The fifth-grade mixture is sent to the third-grade separator, and the fourth-grade mixture is sent to the second-grade grading screen to separate the first-grade powder and wheat bran.
5. The closed-loop internal circulation flour milling process according to claim 4, characterized in that, Step S4 includes: S401: The five-stage mixture after grinding is sent to the three-stage separator via an elevator; S402: The three-stage separator separates the fourth-stage coarse powder and the second-stage powder from the five-stage mixture.
6. The closed-loop internal circulation flour milling process according to claim 5, characterized in that, Step S4 also includes: S403: Treat the fourth-grade coarse powder as waste, or mix the fourth-grade coarse powder, the third-grade coarse powder and the wheat bran screened by the second-grade grading screen, grind them to make a fifth-grade mixture, send the fifth-grade mixture to the third-grade separator, and then repeat steps S402 and S403.
7. The closed-loop internal circulation flour milling process according to claim 3, characterized in that, In step S203, the wheat bran sieved by the primary grading sieve is mixed and ground with the secondary coarse powder to form a tertiary mixture.
8. The closed-loop internal circulation flour milling process according to claim 4, characterized in that, In step S303, the wheat bran sieved by the secondary grading sieve is mixed and ground with the tertiary coarse powder to form a five-stage mixture.
9. The closed-loop internal circulation flour milling process according to claim 1, characterized in that, In step S1, a roller mill is used for grinding.
10. The closed-loop internal circulation flour milling process according to claim 1, characterized in that, In steps S2 to S4, a ball mill is used for grinding, and the ball mill is connected to a dust collector.