Coarse grain mill

Abstract

The application provides a coarse grain grinding machine, and belongs to the technical field of grain processing equipment. The coarse grain grinding machine comprises a main machine and a powder suction device. The main machine is provided with a crushing mechanism and a roller grinding mechanism arranged in an up-down mode. The bottom of the roller grinding mechanism is provided with a powder outlet hopper. The crushing mechanism is used for crushing coarse grain materials to form broken skin granular materials. The roller grinding mechanism is used for grinding the broken skin granular materials into powder materials. The powder suction device is arranged at the side of the main machine and is provided with a receiving box at the bottom. The powder suction device is connected with the powder outlet hopper and is used for pumping the powder materials from the powder outlet hopper to the receiving box. A powder suction channel is arranged between the crushing mechanism and the roller grinding mechanism. The powder suction channel forms a negative pressure under the suction force of the powder suction device acting on the powder outlet hopper. The floating powder generated when the crushing mechanism crushes the coarse grain materials falls into the powder outlet hopper under the negative pressure suction of the powder suction channel. The coarse grain grinding machine provided by the application can reduce the temperature in the coarse grain grinding process, thereby reducing the loss of nutritional ingredients, and can also improve the production cleanliness.

Description

Technical Field

[0001] This invention belongs to the technical field of grain processing equipment, specifically relating to a coarse grain grinding mill. Background Technology

[0002] Whole grains are rich in vitamins and minerals, and consuming them is beneficial for gut health and controlling blood sugar and blood pressure. Common whole grains include cereals such as corn, buckwheat, and millet; legumes such as red beans and black beans; and tubers such as sweet potatoes and yams. Generally, whole grains are processed into flour to make pasta. During processing, whole grains should not be over-ground, otherwise, excessive grinding and frictional heat will cause a significant loss of nutrients. Therefore, the grinding mills currently used for whole grains are mostly hammer mills. Their working principle involves using hammers distributed on a high-speed rotating roller to strike the whole grains. A sieve ring surrounds the roller. When the particle size of the pulverized whole grains is smaller than the sieve openings on the sieve ring, they are thrown out under centrifugal force. In other words, the size of the sieve openings determines the fineness of the whole grain powder.

[0003] In practical applications, the disadvantages of using hammer mills for coarse grain milling are as follows: the high-speed moving hammers continuously strike the coarse grain material and drive it to rotate within the screen ring. This process causes the temperature of the coarse grain material to rise continuously, and the high temperature accelerates the loss of nutrients. The high-speed moving hammers create airflow within the machine. This airflow can be used to blow the coarse grain powder thrown out of the screen ring into the collection bag connected to the outside of the machine. In this process, some coarse grain powder inevitably leaks out with the airflow, which not only causes waste but also leads to dust pollution in the working environment, which is not conducive to clean production. Summary of the Invention

[0004] This invention provides a coarse grain grinding mill, which aims to reduce the loss of nutrients during the coarse grain grinding process and improve production cleanliness.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a coarse grain grinding mill, comprising: The main unit has a crushing mechanism and a roller mill mechanism arranged vertically. The top of the crushing mechanism is equipped with a grain inlet box, and the bottom of the roller mill mechanism is equipped with a powder outlet hopper. The crushing mechanism is used to crush coarse grain materials into broken particles, and the roller mill mechanism is used to grind the broken particles into powder. The powder suction device is located on the side of the main unit and has a receiving box at the bottom. The powder suction device is connected to the powder discharge hopper and is used to draw powder from the powder discharge hopper to the receiving box. The crushing mechanism and the roller mill mechanism are connected by a powder suction channel. The powder suction channel forms a negative pressure under the suction force of the powder suction device on the powder discharge hopper. The floating powder generated when the crushing mechanism crushes coarse grain materials falls into the powder discharge hopper under the negative pressure suction of the powder suction channel.

[0006] In one possible implementation, the host includes: The casing is internally divided into a working chamber and two drive chambers located on both sides of the working chamber by vertical partitions; the top of the casing is equipped with a grain inlet box that communicates with the working chamber, and the bottom is equipped with a powder outlet hopper that communicates with the working chamber. The guide plate assembly is located in the working chamber and divides the working chamber into a crushing chamber and a roller mill chamber. The crushing chamber is used to install the crushing rollers of the crushing mechanism, and the roller mill chamber is used to install the roller mill rollers of the roller mill mechanism. The air guide plate assembly is arranged in a ring around one side of the roller mill and forms a powder suction channel between the roller mill rollers.

[0007] In some embodiments, the roller milling mechanism includes multiple stages of roller milling pairs arranged at intervals, each stage of roller milling pairs including a first grinding roller and a second grinding roller; the guide plate assembly includes multiple first inclined guide plates and multiple second inclined guide plates; wherein, each first inclined guide plate is respectively disposed above each first grinding roller and slides against the upper edge of the peripheral wall of the first grinding roller; each second inclined guide plate is respectively disposed above each second grinding roller and forms a powder inlet between it and the peripheral wall of the second grinding roller, and the second inclined guide plate slides against the peripheral wall of the second grinding roller above it; the air guide plate assembly, the peripheral wall of each second grinding roller, and each second inclined guide plate together form a powder suction channel.

[0008] For example, the air guide plate assembly includes multiple air guide arc plates and multiple air guide inclined plates; each air guide arc plate is respectively arranged around the outer periphery of each second grinding roller, and each air guide inclined plate is respectively arranged on the outer side of each second inclined guide plate; wherein, the uppermost air guide arc plate is connected and fixed to the second inclined guide plate, and the lowermost air guide inclined plate is connected and fixed to the powder outlet hopper.

[0009] For example, the crushing rollers include two crushing rollers that rotate in opposite directions at the same speed. Each crushing roller has a number of toothed discs spaced apart along its own axial direction, and the toothed discs on the two crushing rollers are staggered.

[0010] In one possible implementation, a material discharge ring groove is formed between adjacent sawtooth discs of each crushing roller, and a crushing ring groove is provided at the bottom of the material discharge ring groove. Each sawtooth disc of one crushing roller extends into the crushing ring groove of the other crushing roller. A material discharge baffle is provided above both crushing rollers. The upper end of the material discharge baffle is connected to the feed box, and a number of material blocking fins are distributed at intervals at the lower end. Each material blocking fin extends into each material discharge ring groove.

[0011] For example, a lifting pipe is provided on one side of the powder discharge hopper, and the lifting pipe is connected to the powder suction device; an air inlet is provided on the side of the powder discharge hopper opposite to the lifting pipe, and a damper is connected to the powder discharge hopper for adjusting the opening of the air inlet.

[0012] For example, the side wall of the grain inlet box is provided with a gravity-operated door that can be opened inward, and the top wall of the main unit is provided with a grain inlet guide groove aligned with the gravity-operated door; the gravity-operated door is used to be opened by the coarse grain material in the grain inlet guide groove.

[0013] For example, the powder suction device includes: The powder suction box is divided into an upper chamber and a lower chamber by a horizontal partition. The side wall of the lower chamber is provided with a powder suction port that connects to the powder discharge hopper, and the bottom of the lower chamber is provided with a receiving box. The fan is installed on the powder suction box and its suction end is connected to the upper chamber; Multiple filter elements are spaced apart in the lower chamber and connected to a horizontal partition. The lower end of the filter element is closed, and the upper end of the filter element is open and communicates with the upper chamber. The backflush assembly, located in the upper chamber, is used to intermittently blow air into the interior of each filter element.

[0014] In some embodiments, a guide plate is provided in the lower chamber, with one end of the guide plate connected to the inner wall of the lower chamber and the other end bent downward and extending to cover the powder inlet and the filter element.

[0015] The beneficial effects of the coarse grain grinding mill provided by this invention are as follows: Compared with the prior art, in this coarse grain grinding mill, coarse grain material falls from the feed box into the crushing mechanism, which crushes the coarse grain material into broken particles, which then fall into the roller mill mechanism. The roller mill mechanism grinds the broken particles to obtain powder. The powder suction device sucks the powder falling into the discharge hopper into the receiving box at the bottom to complete the grinding process. By adding a crushing mechanism before the roller mill mechanism, the coarse grain material can be crushed and broken, thus changing the grinding object of the roller mill mechanism from whole coarse grain material to broken particles. This allows for a reduction in grinding intensity while ensuring the required powder particle size. This not only improves the efficiency of coarse grain grinding but also reduces frictional heat during the grinding process, thereby preventing the powder from losing a large amount of nutrients due to high temperature. In addition, the suction force generated by the powder suction device on the discharge hopper creates a negative pressure inside the main unit, and the roller mill mechanism, due to the grinding gap being... The blockage caused by broken particles and powder creates negative pressure in the powder suction channel between the crushing and roller milling mechanisms. This allows the powder generated during the crushing of coarse grains to be drawn into the discharge hopper. Finally, the powder and powder are drawn together by the powder suction device into the receiving box. This not only prevents powder leakage and waste, thus improving the cleanliness of the coarse grain grinding process, but also provides a cooling effect on the roller milling mechanism through the airflow in the powder suction channel, reducing the grinding temperature and further minimizing nutrient loss during the coarse grain grinding process. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of a coarse grain grinding mill provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the vertical cross-sectional structure of the host computer used in the embodiments of the present invention; Figure 3 This is a schematic diagram of the horizontal cross-sectional structure of the host computer used in an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the powder suction device (one side of the powder suction box is open) used in the embodiments of the present invention; Figure 5 This is a three-dimensional structural diagram of the crushing mechanism used in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the crushing roller used in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the material discharge baffle used in an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of the roller mill mechanism used in an embodiment of the present invention.

[0017] In the diagram: 10. Main unit; 100. Powder suction channel; 11. Crushing mechanism; 111. Crushing roller; 112. Sawtooth disc; 113. Material discharge ring groove; 114. Crushing ring groove; 115. Material discharge baffle; 1151. Material baffle fins; 116. Crushing drive assembly; 12. Roller mill mechanism; 121. Roller mill roller pair; 1211. First grinding roller; 1212. Second grinding roller; 122. Roller mill drive assembly; 123. Force adjustment component; 13. Grain inlet box; 131. Gravity box door; 14. Powder outlet hopper; 15. Machine casing; 151. Vertical partition; 152. Working chamber; 1521. Crushing chamber; 1522. Roller mill chamber; 153. Drive chamber; 16. Guide plate assembly; 161. First inclined guide plate; 162. Second inclined guide plate; 1621. Powder inlet; 17. Air guide plate assembly; 171. Air guide arc plate; 172. Air guide inclined plate; 18. Air damper; 19. Grain inlet guide trough; 20. Powder suction device; 21. Receiving box; 22. Powder suction box; 221. Horizontal partition; 222. Upper chamber; 223. Lower chamber; 224. Powder suction port; 225. Guide plate; 23. Fan; 24. Filter element; 25. Backflush assembly; 251. High-pressure air tank; 252. Main exhaust pipe; 253. Branch exhaust pipe; 254. Electromagnetic switch valve; 30. Lifting pipe. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] It should be noted that when an element is referred to as being "located on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0020] Please refer to the following: Figure 1 and Figure 8 The coarse grain grinding mill provided by the present invention will now be described. The coarse grain grinding mill includes a main unit 10 and a powder suction device 20. The main unit 10 has a crushing mechanism 11 and a roller milling mechanism 12 arranged vertically. The top of the crushing mechanism 11 is provided with a grain inlet box 13, and the bottom of the roller milling mechanism 12 is provided with a powder outlet hopper 14. The crushing mechanism 11 is used to crush coarse grain materials into broken particles, and the roller milling mechanism 12 is used to grind the broken particles into powder. The powder suction device 20 is located on the side of the main unit 10 and has a receiving box 21 at the bottom. The powder suction device 20 is connected to the powder outlet hopper 14 and is used to draw the powder from the powder outlet hopper 14 to the receiving box 21. A powder suction channel 100 is provided between the crushing mechanism 11 and the roller milling mechanism 12. The powder suction channel 100 forms a negative pressure under the suction force of the powder suction device 20 acting on the powder outlet hopper 14. The floating powder generated when the crushing mechanism 11 crushes the coarse grain materials falls into the powder outlet hopper 14 under the suction action of the negative pressure of the powder suction channel 100.

[0021] It should be noted that in this embodiment, the crushing mechanism 11 functions to break the outer layer of coarse grain materials through rotational impact and cutting action. If the coarse grain materials are small (such as buckwheat, wheat, etc.), the crushing mechanism 11 is mainly used for breaking the outer layer. If the coarse grain materials are large (such as black beans, corn, sweet potato chunks, etc.), the crushing mechanism 11 is not only used for breaking the outer layer, but can also crush large coarse grain materials into smaller particles. In addition, considering that the downward flow of material from the feed box 13 may vary, the crushing mechanism 11, located above the roller mill mechanism 12, also has the function of controlling the feeding speed of the broken particles to the roller mill mechanism 12. In other words, the crushing mechanism 11 also has the function of uniformly feeding the roller mill mechanism 12, thereby preventing the roller mill mechanism 12 from becoming clogged when the feed suddenly increases.

[0022] It should be noted that in this embodiment, the roller mill mechanism 12 can adopt the same double-roller mill structure as commonly used in existing grinding mills. However, considering the diversity of coarse grain materials and the varied requirements for grinding particle size, the roller mill mechanism 12 should have a force adjustment component 123 (which can also adopt an adjustment structure found in existing technologies, such as…). Figure 8 The grinding gap and intensity are adjusted as shown. Of course, if the same type of coarse grain material is being ground, the intensity adjustment component 123 is not required. Here, it is preferable to use an intensity adjustment component 123 on the roller mill mechanism 12. By adjusting the roller gap parameter, the speed difference of the cooperating grinding rollers, the wire drawing angle and tooth shape of the grinding roller surface, the roller mill mechanism 12 can form a grinding process with shearing as the main method and extrusion as the secondary method for the broken particles, thereby reducing the amount of floating powder generated during the grinding process.

[0023] Based on the above, the coarse grain material has been broken and crushed by the crushing mechanism 11 to form broken particles. Therefore, when passing through the roller mill mechanism 12, compared with the method of directly grinding whole coarse grain particles, it can obtain powder with the required particle size with lower grinding force and grinding time. Thus, the grinding heat is reduced and the grinding efficiency is improved. In this way, the temperature of the powder obtained by grinding can be greatly reduced, thereby minimizing the loss of nutrients in the coarse grain material.

[0024] It should be explained that, in this embodiment, the powder suction device 20 can be understood as a negative pressure suction device with a powder filtering function. The powder material falling into the powder hopper 14 is drawn into the powder suction device 20 by the negative pressure suction force. Under the blocking effect of the powder filtering function, the powder material is separated from the air and falls into the receiving box 21, while the air is directly discharged without obstruction. Since the powder material mixed in the air is filtered out, the cleanliness of the air discharge can be guaranteed, thereby ensuring the cleanliness of the working environment. When the receiving box 21 is full of powder material, the receiving box 21 can be pulled out and replaced with the next receiving box 21 or the powder material can be poured out and reinstalled.

[0025] It is important to emphasize that the crushing mechanism 11 crushes and grinds coarse grains, and the roller mill 12 grinds the crushed particles into powder. Both processes are accompanied by the continuous generation of floating powder (powder that floats in the air). If the floating powder is ignored, it will overflow from the grain inlet hopper 13, the powder outlet hopper 14, the gap between the crushing mechanism 11 and the grinding mechanism and the machine body during the grinding process, resulting in waste and air pollution. The main purpose of the powder suction device 20 in this embodiment is to solve this problem. Specifically, the powder suction device 20 continuously draws out the powder material from the powder hopper 14, thereby creating a negative pressure in the space between the roller mill mechanism 12 and the powder outlet hopper 14. This negative pressure allows the floating powder generated below the roller mill mechanism 12 during grinding to fall into the powder outlet hopper 14. On the other hand, it also creates a negative pressure in the powder suction channel 100, thereby drawing the floating powder generated by the crushing mechanism 11 during the crushing and grinding of the coarse grain material, and the floating powder generated above the roller mill mechanism 12 during grinding, into the suction channel and falling into the powder outlet hopper 14 through the powder suction channel 100. After falling into the powder outlet hopper 14, the floating powder is pumped together with the powder material to the receiving box 21. In this way, not only can the floating powder generated during the crushing and grinding process be removed in time, thus avoiding the waste and air pollution caused by the leakage of floating powder, but the airflow in the powder suction channel 100 can also promote the cooling of the roller mill mechanism 12, thereby reducing the temperature of the powder and further reducing the loss of nutrients during the grinding of coarse grains.

[0026] Compared with the prior art, the coarse grain grinding mill provided in this embodiment, by adding a crushing mechanism 11 before the roller mill mechanism 12, can perform pre-treatment of coarse grain material by breaking and crushing it. This changes the grinding object of the roller mill mechanism 12 from whole coarse grain material to broken and crushed particles, thereby reducing the grinding intensity while ensuring the required powder particle size. This not only improves the efficiency of coarse grain grinding but also reduces frictional heat during the grinding process, thus preventing the powder from losing a large amount of nutrients due to high temperature and pressure. Furthermore, the suction force generated by the powder suction device 20 on the powder outlet hopper 14 creates a negative pressure inside the main unit 10, and the roller mill mechanism 12 operates under these conditions. Because the grinding gap is blocked by broken particles and powder, a negative pressure can be formed in the powder suction channel 100 between the crushing mechanism 11 and the roller mill mechanism 12. This allows the powder generated during the crushing operation of the crushing mechanism 11 on the coarse grain material to be pumped into the powder discharge hopper 14. Finally, the powder and powder are pumped together by the powder suction device 20 to the receiving box 21. This not only avoids the leakage of powder, which would cause waste and air pollution, thus improving the environmental cleanliness of the coarse grain grinding process, but also allows the airflow in the powder suction channel 100 to generate a certain cooling effect on the roller mill mechanism 12, thereby reducing the grinding temperature and further reducing the loss of nutrients during the coarse grain grinding process.

[0027] In some embodiments, please combine Figure 2 and Figure 3 Understandably, the main unit 10 includes a housing 15, a guide plate assembly 16, and an air guide plate assembly 17. The housing 15 is internally divided into a working chamber 152 and two drive chambers 153 located on either side of the working chamber 152, based on a vertical partition 151. The top of the housing 15 has a feed box 13 communicating with the working chamber 152, and the bottom has a powder discharge hopper 14 communicating with the working chamber 152. The guide plate assembly 16 is located within the working chamber 152 and divides it vertically into a crushing chamber 1521 and a roller mill chamber 1522. The crushing chamber 1521 houses the crushing rollers of the crushing mechanism 11, and the roller mill chamber 1522 houses the roller mill rollers 121 of the roller mill mechanism 12. The air guide plate assembly 17 is arranged around one side of the roller mill rollers 121 and forms a powder suction channel 100 between them.

[0028] Two vertical partitions 151 are installed inside the housing 15, forming a working cavity 152 between the two partitions 151. The space outside the two partitions 151 forms a drive cavity 153. The power sources of the crushing mechanism 11 and the roller milling mechanism 12 (i.e., the crushing drive assembly 116 and the roller milling drive assembly 122) can be located in the drive cavity 153, while the working parts of both, namely the crushing rollers and the roller milling rollers 121, are located in the working cavity 152. This ensures the neatness of the appearance of the housing 15 and improves the compactness of the overall mechanism. Based on this, the coarse grain material falls from the feed box 13 into the crushing rollers. After the crushing rollers break and crush the coarse grain material, the broken particles formed fall into the roller mill 121 under the guidance of the guide plate group 16. Since the grinding gap of the roller mill 121 is filled with broken particles, the floating powder generated during the crushing can only fall into the powder discharge hopper 14 through the powder suction channel 100. That is, it falls below the roller mill 121 along the air guide plate group 17 and then into the powder discharge hopper 14.

[0029] Furthermore, it should be understood that the driving force for the floating powder in the crushing chamber 1521 to enter the powder suction channel 100 during the above process is as follows: when the roller mill 121 grinds the broken particles, the grinding gap is in a blocked state. Therefore, when the suction force of the powder suction device 20 creates a negative pressure in the roller mill chamber 1522, the powder suction channel 100 is the only connection between the crushing chamber 1521 and the roller mill chamber 1522. Thus, the powder suction channel 100 can obtain negative pressure and continuously extract the floating powder in the crushing chamber 1521.

[0030] For some possible implementations, please refer to [link / reference]. Figure 2 and Figure 8The roller mill mechanism 12 includes multiple stages of roller mill pairs 121 arranged at intervals, each stage of which includes a first grinding roller 1211 and a second grinding roller 1212; the guide plate assembly 16 includes multiple first inclined guide plates 161 and multiple second inclined guide plates 162; wherein, each first inclined guide plate 161 is respectively disposed above each first grinding roller 1211 and slides against the upper edge of the peripheral wall of the first grinding roller 1211; each second inclined guide plate 162 is respectively disposed above the second grinding roller 1212 and forms a powder inlet slit 1621 between it and the peripheral wall of the second grinding roller 1212, and slides against the peripheral wall of the second grinding roller 1212 above it; the air guide plate assembly 17, together with the peripheral wall of each second grinding roller 1212 and each second inclined guide plate 162, forms a powder suction channel 100.

[0031] The multi-stage grinding rollers 121 arranged at intervals above and below can sequentially grind the broken particles, thereby reducing the grinding force of each stage of the grinding rollers 121, thus reducing grinding heat and avoiding the loss of nutrients. Of course, it should be understood that the grinding gap between each stage of the grinding rollers, namely the gap between the first grinding roller 1211 and the second grinding roller 1212, gradually decreases from top to bottom, and the grinding action is based on the first grinding roller 1211 and the second grinding roller 1212 rotating in opposite directions at different speeds. This grinding method is existing technology and will not be described in detail here.

[0032] The function of each first inclined guide plate 161 and second inclined guide plate 162 is to guide the material at each stage into the next stage of the roller mill 121, while preventing material from leaking out of the crushing chamber 1521 and the roller mill chamber 1522, thus avoiding waste and air pollution. Furthermore, since each stage of the second grinding roller 1212 has a powder inlet 1621 between it and the second inclined guide plate 162 above it, the floating powder generated during grinding by each stage of the first grinding roller 1211 and the second grinding roller 1212 can enter the powder suction channel 100 through the corresponding powder inlet 1621. This achieves timely removal of floating powder generated during the crushing and grinding processes, preventing waste and air pollution caused by powder leakage. Additionally, since the powder suction channel 100 utilizes the peripheral wall of the second grinding roller 1212, the airflow within the powder suction channel 100 can directly contact each stage of the second grinding roller 1212, thereby generating a cooling effect on each stage of the second grinding roller 1212 and helping to reduce the grinding temperature.

[0033] As one specific embodiment of the aforementioned air guide plate assembly 17, please refer to Figure 2The air guide plate assembly 17 includes multiple air guide arc plates 171 and multiple air guide inclined plates 172; each air guide arc plate 171 is respectively arranged around the outer periphery of each second grinding roller 1212, and each air guide inclined plate 172 is respectively arranged on the outer side of each second inclined guide plate 162; wherein, the uppermost air guide arc plate 171 is connected and fixed to the second inclined guide plate 162, and the lowermost air guide inclined plate 172 is connected and fixed to the powder outlet hopper 14.

[0034] The function of the air guide arc plate 171 is to cooperate with the second grinding roller 1212 to form a corresponding arc-shaped powder suction channel 100. The function of the air guide inclined plate 172 is to cooperate with the second inclined guide plate 162 between the adjacent second grinding rollers 1212 to form an inclined powder suction channel 100. After the arc-shaped powder suction channels 100 and the inclined powder suction channels 100 are connected, a complete powder suction channel 100 can be formed. Furthermore, the air guide inclined plate 172 is set on the outside of the second inclined guide plate 162 (i.e., the side of the second inclined guide plate 162 away from the first inclined guide plate 161). Based on the powder inlet slit 1621 below each second inclined guide plate 162, the floating powder generated by each stage of grinding can enter the powder suction channel 100. Not only is the structure simple and compact, but it can also promptly remove the floating powder from each part of the crushing chamber 1521 and the roller mill chamber 1522, thereby ensuring the cleanliness of the coarse grain grinding process.

[0035] Specifically, such as Figure 5 As shown, in this embodiment, the crushing rollers include two crushing rollers 111 that rotate in opposite directions at the same speed. Each crushing roller 111 has several serrated discs 112 spaced apart along its respective axial direction, and the serrated discs 112 on the two crushing rollers 111 are staggered. Compared to the hammer structure of a conventional hammer mill, the use of serrated discs here changes the crushing process of coarse grains from primarily high-speed impact to primarily sawing. Furthermore, the crushing rollers 111 are mainly used for breaking the skin of small coarse grain particles and for lightly crushing large coarse grain particles. Therefore, the use of serrated discs 112 can reduce the impact force on the coarse grains, not only reducing the impact and frictional heat generated during the breaking and crushing process and reducing the loss of nutrients, but also reducing the generation of floating powder, which is conducive to promoting cleaner production.

[0036] It should be noted that, please refer to Figures 5 to 7 It is understood that a material dropping ring groove 113 is formed between adjacent sawtooth discs 112 of each crushing roller 111, and a crushing ring groove 114 is provided at the bottom of the material dropping ring groove 113. Each sawtooth disc 112 of one crushing roller 111 extends into the crushing ring groove 114 of the other crushing roller 111 respectively. A material dropping baffle 115 is provided above the two crushing rollers 111. The upper end of the material dropping baffle 115 is connected to the feed box 13, and a number of material blocking fins 1151 are distributed at intervals at the lower end. Each material blocking fin 1151 extends into each material dropping ring groove 113 respectively.

[0037] After falling from the feed box 13, the coarse grain material enters between the two crushing rollers 111 under the guidance of the discharge baffle 115. Specifically, it falls into each discharge ring groove 113. When the two crushing rollers 111 rotate in opposite directions, the saw toothed disc 112 on one of the crushing rollers 111 impacts and saws the coarse grain material that has entered the corresponding crushing ring groove 114, causing the coarse grain material to be broken and crushed. Since the particle size of the broken particles formed after crushing is smaller, the broken particles fall through the gap between the saw toothed disc 112 and the crushing ring groove 114 into the space between the first grinding roller 1211 and the second grinding roller 1212 at the top. During this process, the baffle fins 1151 can prevent the coarse grain material from sliding directly down the discharge ring groove 113 without being broken and crushed, thereby improving the breaking and crushing rate of the coarse grain material before grinding.

[0038] It should be explained that, due to the large particle size of coarse grains, the coarse grains do not completely block the gap between the two crushing rollers 111 during the crushing process. Therefore, the space above the crushing rollers 111 in the crushing chamber 1521 will still be under negative pressure under the suction force of the powder suction channel 100. As a result, the floating powder in the entire crushing chamber 1521 will move downward and enter the powder suction channel 100. The crushed particles produced after crushing will fall directly into the roller mill mechanism 12 due to their own weight. In this way, the floating powder can be prevented from rising into the grain feed box 13 and leaking out.

[0039] It should be noted that you should refer to [link / reference]. Figure 2 In some embodiments, a lifting pipe 30 is provided on one side of the powder discharge hopper 14, and the lifting pipe 30 is connected to the powder suction device 20; an air inlet is provided on the side of the powder discharge hopper 14 opposite to the lifting pipe 30, and a damper 18 for adjusting the opening of the air inlet is connected to the powder discharge hopper 14. If the air intake of the powder suction device 20 is all provided by the host 10 through the lifting pipe 30, it may cause the suction force of the powder suction channel 100 to be too large. If the suction force of the powder suction channel 100 is too large, unpeeled and crushed coarse grain materials or unground broken particles will be drawn into the powder discharge hopper 14, thereby affecting the yield of coarse grain grinding. Therefore, an air inlet is set here to intake air into the lifting pipe 30. By adjusting the damper 18, the opening of the air inlet can be changed to adjust the airflow ratio entering the lifting pipe 30 through the air inlet, thereby adjusting the negative pressure extraction force in the powder suction channel 100, thereby avoiding the drawing of unpeeled, crushed and ground coarse grain materials into the powder suction channel 100.

[0040] As one specific embodiment of the aforementioned grain inlet box 13, please refer to Figure 1 and Figure 2The side wall of the feed box 13 is provided with a gravity-operated door 131 that can be opened to the inside, and the top wall of the main unit 10 is provided with a feed guide 19 aligned with the gravity-operated door 131; the gravity-operated door 131 is used to be opened by the coarse grain material in the feed guide 19. The gravity-fed door 131 can be understood as a door with a weight block at the bottom. A limiting baffle is set at the bottom of the door frame of the feed box 13. In the initial state, the gravity-fed door 131 abuts against the limiting baffle based on the weight block, thereby forming an almost sealed state inside the feed box 13, which can prevent floating powder from leaking out of the feed box 13. The feed guide 19 can be an inclined trough. When the coarse grain material on the feed guide 19 slides into the feed box 13 due to external force or the inclination angle of the feed guide 19, the coarse grain material pushes the gravity-fed door 131 inward, causing it to open automatically. The structure is simple and ingenious. It can adaptively open the corresponding angle based on the amount of coarse grain material on the feed guide 19 during the feeding process, and close it in time after the feeding is completed, thereby reducing the risk of floating powder leaking out.

[0041] For example, please refer to Figure 4 The aforementioned powder suction device 20 includes a powder suction box 22, a blower 23, multiple filter elements 24, and a back-blowing assembly 25. The powder suction box 22 is divided into an upper chamber 222 and a lower chamber 223 by a partition 221. The side wall of the lower chamber 223 is provided with a powder suction port 224 connected to the powder outlet 14, and the bottom of the lower chamber 223 is provided with a receiving box 21. The blower 23 is located on the powder suction box 22 and its suction end is connected to the upper chamber 222. Multiple filter elements 24 are spaced apart in the lower chamber 223 and connected to the partition 221. The lower end of the filter element 24 is closed, and the upper end of the filter element 24 is open and connected to the upper chamber 222. The back-blowing assembly 25 is located in the upper chamber 222 and is used to intermittently blow air into the interior of each filter element 24.

[0042] The blower 23 directly acts on the upper chamber 222, creating a negative pressure inside the upper chamber 222. This negative pressure is then created in the lower chamber 223 through each filter element 24, causing the powder material in the powder hopper 14 (via the lifting pipe 30) to be drawn to the powder inlet 224 and into the lower chamber 223. After entering the lower chamber 223, the powder material falls into the receiving box 21 due to gravity. At the same time, a lot of floating powder will appear and collide with the peripheral wall of the filter element 24 with the airflow. Since the floating powder cannot penetrate the filter element 24, it will continuously adhere to the peripheral wall of the filter element 24. Clean air enters the interior of the filter element 24. The powder enters the upper chamber 222 from the upper end and is then discharged by the fan 23. As more and more powder adheres to the periphery of the filter element 24, the fan 23 can be turned off and air can be blown into the interior of each filter element 24 through the back-blowing assembly 25 to blow off the powder adhering to the periphery of the filter element 24. Then the fan 23 can be turned on again. Of course, during the normal operation of the fan 23, a higher pressure airflow can also be blown into the interior of the filter element 24 through the back-blowing assembly 25 to blow off the powder on the periphery of the filter element 24. By intermittently blowing air into the filter element 24 through the back-blowing assembly 25, the permeability of the filter element 24 can be ensured, which helps to reduce the energy consumption of the fan 23.

[0043] Optionally, such as Figure 4 As shown, the aforementioned backflushing assembly 25 may specifically include a high-pressure air tank 251, an exhaust main pipe 252 connected to the high-pressure air tank 251, and a plurality of exhaust branch pipes 253 arranged on the exhaust main pipe 252 corresponding to each filter element 24. Each exhaust branch pipe 253 is equipped with an electromagnetic switch valve 254. Each electromagnetic switch valve 254 is controlled by the control system to open and close at regular intervals, and the opening and closing times of each electromagnetic switch valve 254 can be the same or different. Here, it is preferable to adopt the method of each electromagnetic switch valve 254 opening alternately in sequence, so that each exhaust branch pipe 253 blows air onto each filter element 24 in sequence, which can ensure that the filter element 24 is always in a normal working state, thereby ensuring the continuous operation of the powder suction device 20.

[0044] It should be noted that, as Figure 4 As shown, a guide plate 225 is provided in the lower chamber 223. One end of the guide plate 225 is connected to the inner wall of the lower chamber 223, and the other end bends downward and extends to block the powder inlet 224 and the filter element 24. The blocking effect of the guide plate 225 can prevent powder and floating powder from being directly sprayed onto the filter element 24 through the powder inlet 224 with the airflow. On the one hand, it can reduce the probability of damage to the filter element 24, and on the other hand, it can help reduce floating powder, thereby reducing the frequency of backflushing cleaning of the filter element 24 and reducing the risk of floating powder leakage, which is conducive to clean production.

[0045] It should be noted that the coarse grain mill provided in this embodiment can be adjusted to meet the grinding needs of different materials by adjusting the rotation speed of the crushing mechanism 11 driven by the crushing drive assembly 116, the rotation speed of the roller mill mechanism 12 driven by the roller mill drive assembly 122, and the grinding roller spacing of the roller mill mechanism 12. For example, in addition to being suitable for coarse grain grinding, it can also be used to crush koji blocks in wine brewing and soy sauce brewing. Specifically, since the gluten blocks are larger in volume than coarse grains, they can slide one by one into the grain feeding box 13 through the grain feeding guide 19, and then fall into the crushing mechanism 11. In the crushing mechanism 11, the gluten blocks are crushed by the tooth tips of the sawtooth disc 112, which helps to reduce the generation of floating powder. After the crushing mechanism 11 crushes the gluten blocks into fine particles, they fall into the roller mill mechanism 12. The gluten block particles are ground and crushed step by step by at least two roller mill rollers 121, and finally the gluten powder falls into the powder discharge hopper 14. The powder suction device 20 then draws the gluten powder from the powder discharge hopper 14 into the receiving box 21. During this process, due to the suction force of the powder suction device 20, the floating powder generated during the crushing and grinding of the gluten blocks can fall into the powder discharge hopper 14 and enter the powder suction box 22 along with the gluten powder. Finally, based on the powder filtering effect of the filter element 24, all of it falls into the receiving box 21. Since the roller mill mechanism 12 has high requirements for the uniformity of feeding, while the crushing mechanism 11 is not sensitive to changes in the amount of feed, the uniform feeding effect of the crushing mechanism 11 on the roller mill mechanism 12 is more obvious during the process of making flaky powder.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coarse grain grinding mill, characterized in that, include: The main unit has a crushing mechanism and a roller mill mechanism arranged vertically. The top of the crushing mechanism is equipped with a grain inlet box, and the bottom of the roller mill mechanism is equipped with a powder outlet hopper. The crushing mechanism is used to crush coarse grain materials into broken particles, and the roller mill mechanism is used to grind the broken particles into powder. A powder suction device is located on the side of the main unit and has a receiving box at the bottom. The powder suction device is connected to the powder discharge hopper and is used to draw the powder material from the powder discharge hopper to the receiving box. A powder suction channel is provided between the crushing mechanism and the roller mill mechanism. The powder suction channel forms a negative pressure under the suction force of the powder suction device acting on the powder discharge hopper. The floating powder generated when the crushing mechanism crushes the coarse grain material falls into the powder discharge hopper under the suction action of the negative pressure of the powder suction channel. The host includes: The casing is internally divided into a working chamber and two drive chambers located on both sides of the working chamber by a vertical partition; the top of the casing is provided with a grain inlet box communicating with the working chamber, and the bottom is provided with a powder outlet hopper communicating with the working chamber; A guide plate assembly is provided in the working chamber and divides the working chamber into a crushing chamber and a roller milling chamber. The crushing chamber is used to install the crushing rollers of the crushing mechanism, and the roller milling chamber is used to install the roller milling rollers of the roller milling mechanism. An air guide plate assembly is arranged around one side of the rollers of the mill and forms the powder suction channel between the rollers of the mill. The roller mill mechanism includes multiple sets of roller mill pairs arranged at intervals, each set of roller mill pairs including a first grinding roller and a second grinding roller; the guide plate group includes multiple first inclined guide plates and multiple second inclined guide plates; wherein, each first inclined guide plate is respectively disposed above each first grinding roller and slides against the upper edge of the peripheral wall of the first grinding roller; each second inclined guide plate is respectively disposed above each second grinding roller and forms a powder inlet between it and the peripheral wall of the second grinding roller, and the second inclined guide plate slides against the peripheral wall of the second grinding roller above it; the air guide plate group, together with the peripheral wall of each second grinding roller and each second inclined guide plate, forms the powder suction channel; The air guide plate assembly includes multiple air guide arc plates and multiple air guide inclined plates; each air guide arc plate is respectively arranged around the outer periphery of each of the second grinding rollers, and each air guide inclined plate is respectively arranged on the outer side of each of the second inclined guide plates; wherein, the uppermost air guide arc plate is connected and fixed to the second inclined guide plate, and the lowermost air guide inclined plate is connected and fixed to the powder outlet hopper.

2. The coarse grain grinding mill as described in claim 1, characterized in that, The crushing rollers include two crushing rollers that rotate in opposite directions at the same speed. Each of the two crushing rollers has a number of toothed discs spaced apart along its own axial direction, and the toothed discs on the two crushing rollers are staggered.

3. The coarse grain grinding mill as described in claim 2, characterized in that, A material discharge ring groove is formed between adjacent sawtooth discs of each of the crushing rollers. The bottom of the material discharge ring groove is provided with a crushing ring groove. Each sawtooth disc of one of the crushing rollers extends into the crushing ring groove of the other crushing roller. A material discharge baffle is provided above both crushing rollers. The upper end of the material discharge baffle is connected to the feed box, and the lower end is provided with a number of material blocking fins at intervals. Each material blocking fin extends into each of the material discharge ring grooves.

4. The coarse grain grinding mill as described in claim 1, characterized in that, A material lifting pipe is provided on one side of the powder discharge hopper, and the material lifting pipe is connected to the powder suction device; an air inlet is provided on the side of the powder discharge hopper opposite to the material lifting pipe, and a damper for adjusting the opening of the air inlet is connected to the powder discharge hopper.

5. The coarse grain grinding mill as described in claim 1, characterized in that, The side wall of the grain inlet box is provided with a gravity-operated door that can be opened inwards, and the top wall of the main unit is provided with a grain inlet guide groove aligned with the gravity-operated door; the gravity-operated door is used to open under the push of coarse grain material in the grain inlet guide groove.

6. The coarse grain grinding mill as described in any one of claims 1-5, characterized in that, The powder suction device includes: The powder suction box is internally divided into an upper chamber and a lower chamber by a horizontal partition. The side wall of the lower chamber is provided with a powder suction port connected to the powder discharge hopper, and the bottom of the lower chamber is provided with the receiving box. A fan is installed on the powder suction box and its suction end is connected to the upper chamber; Multiple filter elements are spaced apart in the lower chamber and connected to the transverse partition. The lower end of each filter element is closed, and the upper end of each filter element is open and communicates with the upper chamber. A backflush assembly, located in the upper chamber, is used to intermittently blow air into the interior of each of the filter elements.

7. The coarse grain grinding mill as described in claim 6, characterized in that, The lower chamber is provided with a guide plate. One end of the guide plate is connected to the inner wall of the lower chamber, and the other end bends downward and extends to cover the powder suction port and the filter element.

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