Coarse grain flour mill

Abstract

The invention provides a coarse grain pulverizer, which belongs to the technical field of grain processing equipment, and comprises a main machine and a powder suction device, the main machine is provided with a crushing mechanism and a roller grinding mechanism which are arranged up and down; a powder outlet hopper is arranged at the bottom of the roller grinding mechanism; the crushing mechanism is used for crushing coarse grain materials into broken grain particles, and the roller grinding mechanism is used for grinding the broken grain particles into powder materials; the powder suction device is arranged on the side of the main machine, and a material receiving box is arranged at the bottom of the powder suction device. The powder suction device is connected with the powder outlet hopper and used for pumping powder from the powder outlet hopper to the material receiving box. Wherein a powder suction channel is arranged between the crushing mechanism and the roller grinding mechanism, negative pressure is formed in the powder suction channel under the suction force of the powder suction device acting on the powder outlet hopper, and floating powder generated when the crushing mechanism crushes coarse grain materials falls into the powder outlet hopper under the negative pressure suction action of the powder suction channel. According to the coarse grain flour mill provided by the invention, the temperature in the coarse grain flour milling process can be reduced, so that the loss of nutritional ingredients is reduced, and meanwhile, the production cleanliness can also be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of grain processing equipment, and in particular relates to a coarse grain grinding machine. Background Art

[0002] Whole grains are rich in vitamins and minerals, and their consumption is beneficial for gastrointestinal health, blood sugar, and blood pressure control. Common whole grains include cereals such as corn, buckwheat, and millet, beans such as red beans and black beans, and tubers such as sweet potatoes and yams. Usually, whole grains are processed into powder to make pasta for consumption. Over-grinding of whole grains is not recommended during processing, as excessive grinding force and frictional heat generation will lead to a large loss of nutrients in the whole grains. Therefore, the mills currently used for grinding whole grains are mostly hammer mills. Their working principle is to use hammers distributed on a high-speed rotating roller to strike the coarse grains. The outer periphery of the roller is a sieve ring. When the particle size of the crushed coarse grains is smaller than the size of the sieve holes on the sieve ring, they can be thrown out under the action of centrifugal force. In other words, the size of the sieve holes in the sieve ring determines the fineness of the coarse grain powder.

[0003] In actual application, the disadvantages of using hammer mill for coarse grain powder processing are: the high-speed moving hammers continuously hit the coarse grain materials and drive the coarse grain materials to rotate in the screen ring. This process will cause the temperature of the coarse grain materials to continue to rise, and the high temperature will accelerate the loss of nutrients; the high-speed moving hammers form airflow in the machine body, and this part of the 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 body. In this process, the coarse grain powder will inevitably leak out with the airflow, which not only causes waste but also causes dust pollution in the working environment, which is not conducive to clean production. Summary of the Invention

[0004] An embodiment of the present invention provides a coarse grain grinding machine, which aims to reduce the loss of nutrients caused by the coarse grain grinding process and improve production cleanliness.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide a coarse grain grinding machine, comprising: The main machine has a crushing mechanism and a roller grinding mechanism arranged in an upper and lower manner. The top of the crushing mechanism is provided with a grain inlet box, and the bottom of the roller grinding mechanism is provided with a powder discharge hopper. The crushing mechanism is used to crush the coarse grain materials into broken grain particles, and the roller grinding mechanism is used to grind the broken grain particles into powder. The powder suction device is located on the side of the main machine and has a material receiving box at the bottom. The powder suction device is connected to the powder discharge hopper and is used to pump the powder material from the powder discharge hopper to the material receiving box; Among them, a powder suction channel is provided between the crushing mechanism and the roller grinding mechanism. The powder suction channel forms 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 the coarse grain material 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 divided into a working chamber and two driving chambers located on both sides of the working chamber based on a vertical partition; a grain inlet box connected to the working chamber is provided on the top of the casing, and a powder discharge hopper connected to the working chamber is provided on the bottom of the casing; The guide plate group is arranged in the working chamber and divides the working chamber into a crushing chamber and a roller grinding chamber. The crushing chamber is used to set the crushing rollers of the crushing mechanism, and the roller grinding chamber is used to set the roller grinding rollers of the roller grinding mechanism; The air guide plate group is arranged on one side of the roller mill and forms a powder suction channel between the roller mill rollers.

[0007] In some embodiments, the roller grinding mechanism includes a multi-stage roller grinding pair arranged at intervals in the upper and lower parts, and each stage of the roller grinding pair includes a first grinding roller and a second grinding roller; the material guide plate group includes a plurality of first inclined guide plates and a plurality of second inclined guide plates; wherein, each first inclined guide plate is respectively arranged 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 arranged above the second grinding roller and forms a powder inlet gap with 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; a powder suction channel is formed together between the air guide plate group, the peripheral wall of each second grinding roller and each second inclined guide plate.

[0008] Exemplarily, the air guide plate group includes a plurality of air guide arc plates and a plurality of 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 outside of each second inclined guide plate; wherein, the air guide arc plate located at the top is connected and fixed to the second inclined guide plate, and the air guide inclined plate located at the bottom is connected and fixed to the powder outlet hopper.

[0009] For example, the crushing roller pair includes two crushing rollers for rotating in opposite directions at the same speed. The two crushing rollers are respectively provided with a plurality of serrated disks spaced apart along their respective axial directions, and the serrated disks on the two crushing rollers are staggered.

[0010] In one possible implementation, a blanking ring groove is formed between adjacent serrated disks of each crushing roller, and a crushing ring groove is provided at the bottom of the blanking ring groove, wherein each serrated disk of one crushing roller extends into the crushing ring groove of the other crushing roller respectively; a blanking baffle is provided above the two crushing rollers, wherein the upper end of the blanking baffle is connected to the grain feed box, and a plurality of baffle fins are spaced apart at the lower end, and each baffle fin extends into each blanking ring groove respectively.

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

[0012] Exemplarily, the side wall of the grain feed box is provided with a self-gravity box door that can be opened toward the inside, and the top wall of the main machine is provided with a grain feed guide groove aligned with the self-gravity box door; the self-gravity box door is used to open when pushed by the coarse grain material in the grain feed guide groove.

[0013] For example, the powder suction device includes: The powder suction box is divided into an upper chamber and a lower chamber based on a transverse partition. The side wall of the lower chamber is provided with a powder suction port connected to the powder hopper, and the bottom of the lower chamber is provided with a material receiving box; A fan is provided on the powder suction box and the suction end is connected to the upper chamber; Multiple filter elements are spaced apart in the lower chamber and connected to the diaphragm, the lower ends of the filter elements are closed, and the upper ends of the filter elements are open and communicated with the upper chamber; The back-blowing assembly is arranged in the upper chamber and is used for intermittently blowing air into the interior of each filter element.

[0014] In some embodiments, a guide plate is provided in the lower chamber, one end of the guide plate is connected to the inner wall of the lower chamber, and the other end is bent and extended downward to block between the powder suction port and the filter element.

[0015] The beneficial effect of the coarse grain mill provided by the present invention is that compared with the prior art, in the coarse grain mill of the present invention, the coarse grain material falls into the crushing mechanism from the grain feed box, the crushing mechanism crushes the coarse grain material to form broken skin particles, and then falls into the roller grinding mechanism, and the roller grinding mechanism grinds the broken skin particles to obtain powder material, and the powder suction device sucks the powder material falling into the powder hopper into the receiving box at the bottom thereof to complete the grinding process. By adding a crushing mechanism before the roller grinding mechanism, the coarse grain material can be subjected to skin-breaking and crushing treatment, so that the grinding object of the roller grinding mechanism is changed from the complete coarse grain material to the broken skin particles after skin-breaking and crushing, and thus the grinding force can be reduced while ensuring the particle size requirements of the powder material. This is not only conducive to improving the coarse grain grinding efficiency, but also can reduce frictional heat during the grinding process, thereby avoiding the powder material obtained by grinding from losing a large amount of nutrients due to high temperature; in addition, the suction force generated by the powder suction device on the powder hopper can form a negative pressure inside the main machine, and the roller grinding mechanism is negatively charged due to the grinding gap being The crushing mechanism is blocked by broken particles and powder materials, so a negative pressure can be formed in the powder suction channel between the crushing mechanism and the roller mill mechanism, so that the floating powder generated by the crushing mechanism when crushing the coarse grain materials can be sucked into the powder discharge hopper by the powder suction channel, and finally the floating powder and powder materials are sucked into the material receiving box by the powder suction device. This not only avoids the waste and air pollution caused by the leakage of floating powder, thereby improving the environmental cleanliness of the coarse grain grinding process, but also utilizes the airflow in the powder suction channel to produce a certain air cooling effect on the roller mill mechanism, thereby reducing the grinding temperature, which is conducive to further reducing the loss of nutrients caused by the coarse grain grinding process. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] In the figure: 10, main machine; 100, powder suction channel; 11, crushing mechanism; 111, crushing roller; 112, serrated disc; 113, blanking ring groove; 114, crushing ring groove; 115, blanking baffle; 1151, baffle fin; 116, crushing drive assembly; 12, roller grinding mechanism; 121, roller grinding roller pair; 1211, first grinding roller; 1212, second grinding roller; 122, roller grinding drive assembly; 123, force adjustment member; 13, grain feed box; 131, self-gravity box door; 14, powder discharge hopper; 15, casing; 151, vertical partition; 152, working chamber; 1521, crushing chamber; 1522, roller grinding chamber 153. Drive chamber; 16. Guide plate group; 161. First inclined guide plate; 162. Second inclined guide plate; 1621. Powder inlet slit; 17. Air guide plate group; 171. Air guide arc plate; 172. Air guide inclined plate; 18. Air damper; 19. Grain feed guide trough; 20. Powder suction device; 21. Material receiving box; 22. Powder suction box; 221. Transverse 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 bag; 252. Exhaust main pipe; 253. Exhaust branch pipe; 254. Solenoid switch valve; 30. Lifting pipe. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain 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 "provided on" or "connected to" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0020] Please also refer to Figure 1 and Figure 8 Now, the coarse grain grinding machine provided by the present invention is described. The coarse grain grinding machine includes a main unit 10 and a powder suction device 20; the main unit 10 has a crushing mechanism 11 and a roller grinding mechanism 12 arranged up and down, a grain feed box 13 is provided on the top of the crushing mechanism 11, and a powder discharge hopper 14 is provided at the bottom of the roller grinding mechanism 12; the crushing mechanism 11 is used to crush the coarse grain material to form broken skin particles, and the roller grinding mechanism 12 is used to grind the broken skin particles into powder material; the powder suction device 20 is arranged on the side of the main unit 10 and has a material receiving box 21 at the bottom, the powder suction device 20 is connected to the powder discharge hopper 14 and is used to pump the powder material from the powder discharge hopper 14 to the material receiving box 21; wherein, a powder suction channel 100 is provided between the crushing mechanism 11 and the roller grinding mechanism 12, and the powder suction channel 100 forms a negative pressure under the suction force of the powder suction device 20 on the powder discharge hopper 14, and the floating powder generated when the crushing mechanism 11 crushes the coarse grain material falls into the powder discharge hopper 14 under the suction action of the negative pressure of the powder suction channel 100.

[0021] It should be noted that the function of the crushing mechanism 11 in this embodiment is to break the cortex of the coarse grain material through rotational impact and cutting. If the coarse grain material is small in particle size (such as buckwheat and wheat), the crushing mechanism 11 is primarily used to break the cortex. If the coarse grain material is large in particle size (such as black beans, corn, and sweet potato chunks), the crushing mechanism 11 not only breaks the cortex but also can crush the large coarse grain material into smaller particles. In addition, considering that the amount of material falling from the grain feed box 13 may vary, the crushing mechanism 11, located above the roller mill mechanism 12, also controls the feed rate of the cortex-broken particles into the roller mill mechanism 12. In other words, the crushing mechanism 11 also serves to uniformly feed 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 the roller mill mechanism 12 in this embodiment can adopt the same roller mill structure as the common grinding mill in the prior art. At the same time, considering the diversity of types of coarse grain materials and the diverse requirements for grinding particle size, the roller mill mechanism 12 should have a force adjustment member 123 (which can also adopt the adjustment structure in the prior art, such as Figure 8 The grinding gap and force are adjusted by adjusting the grinding gap (as shown). Of course, if the same coarse grain material is being ground, the force adjustment member 123 is not necessary. Preferably, the force adjustment member 123 is provided on the roller mill mechanism 12. By adjusting the roller gap parameter, i.e., the grinding gap, as well as the speed difference between the grinding rollers, the drawing angle of the grinding roller surfaces, and the tooth profile, the roller mill mechanism 12 can achieve a grinding process for the skin-broken particles that is primarily shearing and supplemented by extrusion, thereby reducing the amount of floating powder generated during the grinding process.

[0023] On the basis of the above, the coarse grain material has been subjected to the skin-breaking and pulverizing treatment of the crushing mechanism 11 to form broken skin particles. Therefore, when passing through the roller grinding mechanism 12, compared with the method of directly grinding the complete coarse grain particles, a powder material with the required particle size can be obtained with a lower grinding force and grinding time. Therefore, the grinding heat generation is reduced and the grinding efficiency is improved. In this way, the temperature of the powder material obtained by grinding can be greatly reduced, thereby minimizing the loss of nutrients in the coarse grain material.

[0024] It needs to be explained that the powder suction device 20 in this embodiment can be specifically understood as a negative pressure suction device with a powder filtering function. The powder material falling into the powder outlet hopper 14 is sucked into the powder suction device 20 through the negative pressure suction force. Under the blocking effect of the powder filtering function on the powder material, the powder material is separated from the air, and the powder material falls into the material 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 material receiving box 21 is full of powder material, the material receiving box 21 is pulled out and replaced with the next material receiving box 21, or the powder material is poured out and reinstalled.

[0025] It should be emphasized here that the crushing mechanism 11 crushes the skin of the coarse grain material and the roller grinding mechanism 12 grinds the broken skin particles into powder, which is accompanied by the continuous generation of floating powder (powder material floating in the air). If the floating powder is ignored, it will overflow from the grain inlet box 13, the powder outlet hopper 14, the crushing mechanism 11, the fitting gap between the grinding mechanism and the machine body during the grinding process, thereby causing waste and environmental air pollution. In response to this phenomenon, the main purpose of providing the powder suction device 20 in this embodiment is to solve this problem. The powder suction device 20 continuously sucks the powder material in the powder hopper 14, thereby forming a negative pressure in the space area between the roller grinding mechanism 12 and the powder discharge hopper 14. On the one hand, this negative pressure can make the floating powder generated below the roller grinding mechanism 12 during the grinding process fall toward the powder discharge hopper 14. On the other hand, it can also cause a negative pressure to be formed in the powder suction channel 100, so that the floating powder generated in the process of breaking the skin and crushing the coarse grain material by the crushing mechanism 11 and the floating powder generated above it during the grinding process of the roller grinding mechanism 12 are sucked into the air suction channel and fall into the powder discharge hopper 14 through the powder suction channel 100. After falling into the powder discharge hopper 14, the floating powder is pumped to the material receiving box 21 together with the powder material. In this way, not only can the floating powder generated in the process of breaking the skin and grinding can be extracted in time, thereby 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 grinding mechanism 12, thereby reducing the temperature of the ground powder, and further reducing the loss of nutrients in the coarse grain grinding process.

[0026] Compared with the prior art, the coarse grain mill provided in this embodiment can pre-treat the coarse grain materials by breaking the skin and crushing them, by adding a crushing mechanism 11 before the roller mill mechanism 12, so that the grinding object of the roller mill mechanism 12 is changed from the complete coarse grain materials to the broken skin particles after breaking the skin and crushing, and thus the grinding force can be reduced while ensuring the particle size requirements of the powder material. This is not only conducive to improving the coarse grain grinding efficiency, but also can reduce the friction and heat in the grinding process, thereby avoiding the powder material obtained from the grinding from losing a large amount of nutrients due to high temperature and high pressure; in addition, the suction force generated by the powder suction device 20 on the powder hopper 14 can form a negative pressure inside the main machine 10, and the roller mill mechanism 12 is in the working process. Since the grinding gap is blocked by broken particles and powder materials, a negative pressure can be formed in the powder suction channel 100 between the crushing mechanism 11 and the roller grinding mechanism 12, so that the floating powder generated by the crushing mechanism 11 when crushing the coarse grain material can be sucked into the powder discharge hopper 14 by the powder suction channel 100, and finally the floating powder and powder materials are sucked into the material receiving box 21 by the powder suction device 20. This not only avoids the waste and air pollution caused by the leakage of floating powder, thereby improving the environmental cleanliness of the coarse grain grinding process, but also utilizes the airflow in the powder suction channel 100 to produce a certain air cooling effect on the roller grinding mechanism 12, thereby reducing the grinding temperature, which is conducive to further reducing the loss of nutrients caused by the coarse grain grinding process.

[0027] In some embodiments, please combine Figure 2 and Figure 3 It is understood that the main unit 10 includes a casing 15, a material guide plate group 16 and an air guide plate group 17; wherein, the interior of the casing 15 is divided into a working chamber 152 and two driving chambers 153 located on both sides of the working chamber 152 based on a vertical partition 151; the top of the casing 15 is provided with a grain input box 13 connected to the working chamber 152, and the bottom is provided with a powder discharge hopper 14 connected to the working chamber 152; the material guide plate group 16 is arranged in the working chamber 152 and divides the working chamber 152 into a crushing chamber 1521 and a roller grinding chamber 1522 above and below, the crushing chamber 1521 is used to set the crushing pair of rollers of the crushing mechanism 11, and the roller grinding chamber 1522 is used to set the roller grinding pair of rollers 121 of the roller grinding mechanism 12; the air guide plate group 17 is arranged on one side of the roller grinding pair of rollers 121 and forms a powder suction channel 100 with the roller grinding pair of rollers 121.

[0028] Two vertical partitions 151 are set inside the casing 15, and a working chamber 152 is formed between the two vertical partitions 151. The space outside the two vertical partitions 151 forms a driving chamber 153. The power sources of the crushing mechanism 11 and the roller grinding mechanism 12 (i.e., the crushing drive assembly 116 and the roller grinding drive assembly 122) can be set in the driving chamber 153, and the working parts of the two, i.e., the crushing rollers and the roller grinding rollers 121, are set in the working chamber 152, thereby ensuring the neat appearance of the casing 15 and improving the compactness of the entire machine structure. On this basis, the coarse grain materials fall from the grain feeding box 13 and enter the crushing roller pair. The broken skin particles formed after the crushing roller pair breaks the skin of the coarse grain materials fall into the roller grinding roller pair 121 under the guidance of the material guide plate group 16. Since the grinding gap of the roller grinding roller pair 121 is filled with the broken skin particles, the floating powder generated during the breaking and crushing can only fall into the powder discharge hopper 14 through the powder suction channel 100, that is, along the air guide plate group 17, bypassing the roller grinding roller pair 121 and falling to the bottom of the roller grinding roller pair 121, and then falling into the powder discharge hopper 14.

[0029] In addition, it should be understood that the power source for the floating powder in the crushing chamber 1521 to enter the powder suction channel 100 in the above process is: when the roller 121 of the roller mill is grinding the broken particles, the grinding gap is in a blocked state. Therefore, when the suction force of the powder suction device 20 causes a negative pressure to be formed in the roller grinding chamber 1522, the powder suction channel 100 is the only connecting part between the crushing chamber 1521 and the roller grinding chamber 1522. Therefore, 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, see Figure 2 and Figure 8The roller grinding mechanism 12 includes a multi-stage roller grinding roller pair 121 arranged at an interval up and down, and each stage of the roller grinding roller pair 121 includes a first grinding roller 1211 and a second grinding roller 1212; the guide plate group 16 includes a plurality of first inclined guide plates 161 and a plurality of second inclined guide plates 162; wherein, each first inclined guide plate 161 is respectively correspondingly arranged 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 correspondingly arranged above the second grinding roller 1212 and forms a powder inlet opening 1621 with the peripheral wall of the second grinding roller 1212, and the second inclined guide plate 162 slides against the peripheral wall of the second grinding roller 1212 above it; a powder suction channel 100 is jointly formed between the air guide plate group 17 and the peripheral wall of each second grinding roller 1212 and each second inclined guide plate 162.

[0031] The multi-stage roller grinding rollers 121 arranged at intervals above and below can realize the step-by-step grinding of the broken skin particles in sequence, thereby reducing the grinding force of each stage of the roller grinding rollers 121, thereby reducing the grinding heat and avoiding the loss of nutrients; of course, it should be understood here that the grinding gap between the grinding rollers at each stage, that is, the gap between the first grinding roller 1211 and the second grinding roller 1212, gradually decreases from top to bottom, and the line of sight of 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 a prior art 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 materials of each level into the roller mill pair 121 of the next level, while avoiding material leakage to the outside of the crushing chamber 1521 and the roller mill chamber 1522, which would cause waste and air pollution. On this basis, since there is a powder inlet slit 1621 between the second grinding roller 1212 of each level and the second inclined guide plate 162 above it, the floating powder generated by the first grinding roller 1211 and the second grinding roller 1212 of each level during grinding can enter the powder suction channel 100 through the corresponding powder inlet slit 1621, thereby realizing the timely extraction of the floating powder generated in the skin crushing and grinding processes of each level, and avoiding the leakage of floating powder to cause waste and environmental air pollution. On this basis, since the powder suction channel 100 relies on the peripheral wall of the second grinding roller 1212, the airflow in the powder suction channel 100 can directly contact the second grinding roller 1212 of each level, thereby generating a cooling effect on the second grinding roller 1212 of each level, which helps to reduce the grinding temperature.

[0033] As a specific embodiment of the above-mentioned air guide plate group 17, please refer to Figure 2The air guide plate group 17 includes a plurality of air guide arc plates 171 and a plurality of 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; among them, the air guide arc plate 171 located at the top is connected and fixed to the second inclined guide plate 162, and the air guide inclined plate 172 located at the bottom 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, and the function of the air guide inclined plate 172 is to cooperate with the second inclined guide plate 162 between adjacent second grinding rollers 1212 to form an inclined powder suction channel 100. After each arc-shaped powder suction channel 100 is connected with the inclined powder suction channel 100, a complete powder suction channel 100 can be formed, and the air guide inclined plate 172 is set on the outside of the second inclined guide plate 162 (that is, the side of the second inclined guide plate 162 away from the first inclined guide plate 161). Based on the powder inlet slits 1621 under each second inclined guide plate 162, the floating powder generated by each level of grinding can enter the powder suction channel 100. Not only is the structure simple and compact, but the floating powder in various parts of the crushing chamber 1521 and the roller grinding chamber 1522 can be timely extracted cleanly, thereby ensuring the cleanliness of the coarse grain grinding process.

[0035] Specifically, if Figure 5 As shown, in this embodiment, the crushing roller pair includes two crushing rollers 111 for rotating at the same speed in opposite directions. The two crushing rollers 111 are each provided with a plurality of serrated discs 112 spaced apart along their respective axial directions, and the serrated discs 112 on the two crushing rollers 111 are staggered. Compared with the hammer structure of a conventional hammer mill, the use of serrated discs in this embodiment changes the crushing process of the coarse grain material from being mainly high-speed impact to being mainly sawing. Moreover, the crushing rollers 111 are mainly used for breaking the skin of small-particle coarse grain materials and lightly crushing large-particle coarse grain materials. Therefore, the use of serrated discs 112 can reduce the impact force on the coarse grain materials, which not only reduces the impact and friction heat generated during the crushing process of the coarse grain materials, reduces the loss of nutrients, but also reduces the generation of floating powder, which is conducive to promoting clean production.

[0036] It should be noted that, please combine Figures 5 to 7 It is understood that a blanking ring groove 113 is formed between adjacent serrated disks 112 of each of the above-mentioned crushing rollers 111, and a crushing ring groove 114 is provided at the bottom of the blanking ring groove 113, and each serrated disk 112 of one crushing roller 111 extends into the crushing ring groove 114 of the other crushing roller 111 respectively; a blanking baffle 115 is provided above the two crushing rollers 111, and the upper end of the blanking baffle 115 is connected to the grain feed box 13, and a number of baffle fins 1151 are spaced apart at the lower end, and each baffle fin 1151 extends into each blanking ring groove 113 respectively.

[0037] After the coarse grain material falls from the grain feed box 13, it enters between the two crushing rollers 111 under the guidance of the blanking baffle 115, specifically falls into each blanking ring groove 113. When the two crushing rollers 111 rotate in opposite directions, the serrated disk 112 on one of the crushing rollers 111 hits and saws the coarse grain material entering the corresponding crushing ring groove 114, so that the coarse grain material is broken and crushed. Since the particle size of the broken skin particles formed after crushing becomes smaller, the broken skin particles fall from the gap between the serrated disk 112 and the crushing ring groove 114 and enter between the top first grinding roller 1211 and the second grinding roller 1212. In this process, due to the action of the baffle fin 1151, the coarse grain material can be prevented from sliding directly from the blanking 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 here that, due to the large particle size of the coarse grain material, the coarse grain material will not completely block the gap between the two crushing rollers 111 during the skin breaking and crushing process. Therefore, the space above the crushing roller 111 in the crushing chamber 1521 will still have a negative pressure under the suction force of the powder suction channel 100. Therefore, the floating powder in the entire crushing chamber 1521 will move downward and enter the powder suction channel 100, and the broken skin particles produced after the skin breaking and crushing will directly fall into the roller grinding mechanism 12 due to their own weight. In this way, it can avoid the floating powder rising into the grain inlet box 13 and leaking out.

[0039] Please note that Figure 2 In some embodiments, a feeding pipe 30 is provided on one side of the powder discharge hopper 14, and the feeding pipe 30 is connected to the powder suction device 20. An air supply port is provided on the side of the powder discharge hopper 14 opposite the feeding pipe 30, and a damper 18 is connected to the powder discharge hopper 14 for adjusting the opening of the air supply port. If the air supply to the powder suction device 20 is entirely provided from within the main unit 10 through the feeding pipe 30, the suction force of the powder suction channel 100 may be too strong. Excessive suction force of the powder suction channel 100 will cause unpeeled and pulverized coarse grain materials or unground broken grain particles to be drawn into the powder discharge hopper 14, thereby affecting the yield of coarse grain grinding. Therefore, an air supply port is provided to supply air to the feeding pipe 30. By adjusting the damper 18 to change the opening of the air supply port, the proportion of airflow entering the feeding pipe 30 from the air supply port can be adjusted, thereby adjusting the negative pressure extraction force in the powder suction channel 100, thereby preventing unpeeled and pulverized coarse grain materials from being drawn into the powder suction channel 100.

[0040] As a specific embodiment of the above-mentioned grain feeding box 13, please refer to Figure 1 and Figure 2The side wall of the grain feed box 13 is provided with a self-gravity box door 131 that can be opened to the inside, and the top wall of the main machine 10 is provided with a grain feed guide groove 19 aligned with the self-gravity box door 131; the self-gravity box door 131 is used to open when pushed by the coarse grain material in the grain feed guide groove 19. Here, the self-gravity box door 131 can be understood as a box door with a weight block at the bottom, and a limit rib is set at the bottom of the door frame of the grain feed box 13. In the initial state, the self-gravity box door 131 is in contact with the limit rib based on the weight block, so that the interior of the grain feed box 13 forms a nearly sealed state, thereby preventing floating powder from leaking out of the grain feed box 13; the grain feed guide groove 19 can be an inclined groove. When the coarse grain material on the grain feed guide groove 19 is pushed by external force or slides into the interior of the grain feed box 13 based on the inclination angle of the grain feed guide groove 19, the coarse grain material pushes the self-gravity box door 131 inward and opens it automatically. The structure is simple and clever. It can adaptively open to a corresponding angle based on the amount of coarse grain material on the grain feed guide groove 19 during the grain feeding process, and can be closed in time after the grain feeding is completed, thereby reducing the risk of floating powder leaking out.

[0041] For example, see Figure 4 The above-mentioned powder suction device 20 includes a powder suction box 22, a fan 23, multiple filter elements 24, and a back-blowing assembly 25; wherein, the interior of the powder suction box 22 is divided into an upper chamber 222 and a lower chamber 223 based on a transverse partition 221, and the side wall of the lower chamber 223 is provided with a powder suction port 224 connected to the powder discharge hopper 14, and the bottom of the lower chamber 223 is provided with a material receiving box 21; the fan 23 is arranged on the powder suction box 22 and the air suction end is connected to the upper chamber 222; multiple filter elements 24 are arranged at intervals in the lower chamber 223 and are connected to the transverse 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 arranged in the upper chamber 222, for intermittently blowing air into the interior of each filter element 24.

[0042] The fan 23 acts directly on the upper chamber 222 to generate negative pressure inside the upper chamber 222, and then forms a negative pressure in the lower chamber 223 through each filter element 24, so that the powder material in the powder hopper 14 (through the material lifting pipe 30) is drawn out to the powder suction port 224 and enters 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 hit the peripheral wall of the filter element 24 with the air flow. Since the floating powder cannot pass through the filter element 24, the floating powder will continue to adhere to the peripheral wall of the filter element 24, and the clean air entering the filter element 24 is clean air. The clean air is discharged by the filter element 24. The upper end of the filter element 24 enters the upper chamber 222 and is then discharged through the fan 23; as more and more floating powder adheres to the peripheral wall of the filter element 24, the fan 23 can be turned off and air can be blown into each filter element 24 through the back-blowing component 25, so as to blow off the floating powder adhered to the peripheral wall of the filter element 24, and then the fan 23 can be turned on again. Of course, a higher-pressure airflow can also be blown into the filter element 24 through the back-blowing component 25 during the normal operation of the fan 23, which can also blow off the floating powder on the peripheral wall of the filter element 24; intermittently blowing air into the filter element 24 through the back-blowing component 25 can ensure the air permeability of the filter element 24, which helps to reduce the energy consumption of the fan 23.

[0043] Alternatively, as Figure 4 As shown, the backflush assembly 25 may specifically include a high-pressure air bag 251, an exhaust main pipe 252 connected to the high-pressure air bag 251, and a plurality of exhaust branches 253 provided on the exhaust main pipe 252 corresponding to each filter element 24. Each exhaust branch pipe 253 is provided with an electromagnetic switch valve 254. Each electromagnetic switch valve 254 is controlled by a control system to open and close at a fixed time, and the opening and closing times of each electromagnetic switch valve 254 can be the same or different. It is preferred that each electromagnetic switch valve 254 be opened alternately in sequence, so that each exhaust branch pipe 253 blows air to each filter element 24 in sequence, which can ensure that the filter element 24 is always in normal working condition, thereby ensuring the continuous operation of the powder suction device 20.

[0044] It should be noted that if 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 is bent downward and extends to block between the powder suction port 224 and the filter element 24. The shielding effect of the guide plate 225 prevents powder and floating powder from being directly injected into the filter element 24 by the airflow from the powder suction port 224. This can reduce the risk of damage to the filter element 24 and also help reduce floating powder, thereby reducing the frequency of backflushing cleaning of the filter element 24 and the risk of floating powder leakage, thereby promoting clean production.

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

[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 in the scope of protection of the present invention.

Claims

1. Coarse grain grinding machine, characterized in that, include: The main machine comprises a crushing mechanism and a roller grinding mechanism arranged in an upper and lower manner. The top of the crushing mechanism is provided with a grain inlet box, and the bottom of the roller grinding mechanism is provided with a powder discharge hopper. The crushing mechanism is used to crush the coarse grain materials into broken-grain particles, and the roller grinding mechanism is used to grind the broken-grain particles into powder. A powder suction device is provided on the side of the main machine and has a material receiving box at the bottom. The powder suction device is connected to the powder discharge hopper and is used to pump the powder material from the powder discharge hopper to the material receiving box. A powder suction channel is provided 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 discharge hopper. The floating powder generated when the crushing mechanism crushes the coarse grain material falls into the powder discharge hopper under the negative pressure suction action of the powder suction channel.

2. The coarse grain grinding machine according to claim 1, characterized in that The host comprises: The casing has an interior divided into a working chamber and two driving chambers located on both sides of the working chamber based on a vertical partition; the top of the casing is provided with the grain inlet box connected to the working chamber, and the bottom of the casing is provided with the powder outlet hopper connected to the working chamber; A material guide plate group is arranged in the working chamber and divides the working chamber into a crushing chamber and a roller grinding chamber. The crushing chamber is used to arrange the crushing rollers of the crushing mechanism, and the roller grinding chamber is used to arrange the roller grinding rollers of the roller grinding mechanism. The air guide plate group is arranged on one side of the roller mill pair of rollers and forms the powder suction channel between the roller mill pair of rollers.

3. The coarse grain grinding machine according to claim 2, characterized in that The roller grinding mechanism includes a plurality of roller grinding roller pairs arranged in an upper and lower interval, and each roller grinding roller pair includes a first grinding roller and a second grinding roller; The guide plate group includes a plurality of first inclined guide plates and a plurality of second inclined guide plates; wherein each of the first inclined guide plates is respectively arranged above each of the first grinding rollers and is in sliding contact with the upper edge of the peripheral wall of the first grinding roller; each of the second inclined guide plates is respectively arranged above the second grinding roller and forms a powder inlet slot with the peripheral wall of the second grinding roller, and the second inclined guide plates are in sliding contact with the peripheral wall of the second grinding roller above them; The powder suction channel is formed between the air guide plate group, the peripheral wall of each second grinding roller and each second inclined guide plate.

4. The coarse grain grinding machine according to claim 3, characterized in that The air guide plate group includes a plurality of air guide arc plates and a plurality of air guide inclined plates; each of the air guide arc plates is respectively arranged around the outer periphery of each of the second grinding rollers, and each of the air guide inclined plates is respectively arranged on the outer side of each of the second inclined guide plates; wherein the air guide arc plate located at the top is connected and fixed to the second inclined guide plate, and the air guide inclined plate located at the bottom is connected and fixed to the powder outlet hopper.

5. The coarse grain grinding machine according to claim 2, characterized in that The crushing roller pair includes two crushing rollers for rotating in opposite directions at the same speed. The two crushing rollers are respectively provided with a plurality of serrated disks spaced apart along their respective axial directions, and the serrated disks on the two crushing rollers are staggered.

6. The coarse grain grinding machine according to claim 5, characterized in that A blanking ring groove is formed between adjacent serrated disks of each crushing roller, and a crushing ring groove is provided at the bottom of the blanking ring groove, wherein each serrated disk of one crushing roller extends into the crushing ring groove of the other crushing roller respectively; a blanking baffle is provided above the two crushing rollers, wherein the upper end of the blanking baffle is connected to the grain feed box, and a plurality of baffle fins are spaced apart at the lower end, and each of the baffle fins extends into each of the blanking ring grooves respectively.

7. The coarse grain grinding machine according to claim 1, characterized in that A feeding pipe is provided on one side of the powder discharge hopper, and the feeding pipe is connected to the powder suction device; an air supply port is provided on the side of the powder discharge hopper opposite to the feeding pipe, and a damper for adjusting the opening of the air supply port is connected to the powder discharge hopper.

8. The coarse grain grinding machine according to claim 1, characterized in that The side wall of the grain feed box is provided with a self-gravity box door that can be opened toward the inside thereof, and the top wall of the main machine is provided with a grain feed guide groove aligned with the self-gravity box door; the self-gravity box door is used to open when pushed by the coarse grain material in the grain feed guide groove.

9. The coarse grain grinding machine according to any one of claims 1 to 8, characterized in that The powder suction device comprises: A powder suction box, the interior of which is divided into an upper chamber and a lower chamber based on a transverse partition, the side wall of the lower chamber is provided with a powder suction port connected to the powder hopper, and the bottom of the lower chamber is provided with the material receiving box; A fan is provided on the powder suction box and its suction end is connected to the upper chamber; A plurality of filter elements are spaced apart and arranged in the lower chamber and connected to the transverse partition, wherein the lower ends of the filter elements are closed and the upper ends of the filter elements are open and communicated with the upper chamber; The back-blowing component is arranged in the upper chamber and is used for intermittently blowing air into the interior of each filter element.

10. The coarse grain grinding machine according to claim 9, characterized in that A guide plate is provided in the lower chamber, one end of the guide plate is connected to the inner wall of the lower chamber, and the other end of the guide plate is bent and extended downward to block between the powder suction port and the filter element.

Images