A multi-cereal superfine circulating grinding device

Abstract

The utility model relates to a kind of five cereals superfine circulating flour mill devices, including circulating flour mill, driving device, powder pipeline and cyclone collector;Circulating flour mill is provided with grinding chamber, powder selecting chamber and powder outlet chamber, wherein grinding chamber is equipped with breaking hammer, breaking wall and lower impeller, powder selecting chamber is equipped with winnowing cage, and powder outlet chamber is equipped with upper impeller;The middle part of circulating flour mill is provided with main shaft, and main shaft is drivingly connected with driving device;Breaking hammer, lower impeller, winnowing cage and upper impeller are all arranged on main shaft, and the powder outlet of powder outlet chamber is connected with cyclone collector through powder pipeline.Circulating flour mill uses circulating grinding mode, material enters grinding chamber and is crushed twice, then enters powder selecting chamber, fine powder flows upward and enters cyclone collector as product through powder outlet chamber, and coarse powder falls to grinding chamber and is crushed again, so that the uniformity of product granularity is ensured.

Description

Technical Field

[0001] This utility model relates to the field of agricultural product processing technology, and in particular to an ultra-fine circulating grinding device for grains. Background Technology

[0002] Whole grains (such as oats, brown rice, quinoa, buckwheat, millet, black rice, sorghum, and Job's tears) have higher nutritional value than refined grains (such as white rice and wheat flour). Whole grains are grains that have not undergone refined processing and retain their complete grain structure (including bran, germ, and endosperm). They are rich in dietary fiber, B vitamins, minerals, and antioxidants (polyphenols, anthocyanins, etc.), and have a higher protein content. With the continuous improvement of people's health awareness, whole grains are upgrading from traditional staple foods to functional foods due to their nutritional advantages and health attributes.

[0003] Grain and cereal grinding equipment is a type of agricultural product processing machinery, mainly used for grinding and processing various grains, beans, and miscellaneous grains. The development of this type of equipment is closely related to the history of human food processing, evolving from primitive stone mills and mortars to modern high-efficiency grinding machinery over thousands of years. Since the beginning of the 21st century, ultra-micro grinding technology has combined mechanical force and airflow grinding principles, achieving micron-level grinding effects, making it particularly suitable for processing health foods and pharmaceutical raw materials. However, most grain grinders currently used by small processing enterprises adopt batch production methods, meaning that a batch of material is fed in, ground, and then discharged, before the next batch is fed in for grinding, and so on. However, due to the different properties of various materials in grains and cereals, this batch grinding method results in significant particle size deviations in the finished product. Furthermore, for grains with husks, the high toughness of the husk and the brittleness of the endosperm lead to a 3-5 fold difference in the mechanical response during grinding. Ideally, the particle size of the cortex after pulverization should be 100–300 μm, and the particle size of the endosperm after pulverization should be 50–150 μm. However, in reality, the coefficient of variation of particle size distribution (which reflects the dispersion of particle size in the particle population, with smaller values ​​indicating more uniform distribution) is as high as 35%–45%. Summary of the Invention

[0004] This utility model provides an ultra-fine circulating grinding device for grains and cereals. The main equipment, the circulating grinding mill, adopts a circulating grinding method. After the material enters the grinding chamber, it is crushed twice and then enters the powder selection chamber. The fine powder flows upward and enters the cyclone collector through the powder outlet chamber as the product, while the coarse powder falls back into the grinding chamber for further crushing, thereby ensuring the uniformity of the product particle size.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circulating mill for ultrafine grains includes a circulating mill, a drive unit, a powder conveying pipe, and a cyclone collector. The circulating mill is arranged from bottom to top as a grinding chamber, a classifying chamber, and a discharge chamber. The grinding chamber is equipped with a crusher, a crushing wall, and a lower impeller; the classifying chamber is equipped with an air classifier; and the discharge chamber is equipped with an upper impeller. A main shaft is vertically mounted in the middle of the circulating mill, and its bottom end is connected to the drive unit. The crusher, lower impeller, air classifier, and upper impeller are all mounted on the main shaft at corresponding positions and can rotate with the main shaft. The crushing wall has a cylindrical structure, located above the crusher and around the lower impeller, and has multiple cutters along its circumference. The bottom opening of the classifying chamber is connected to the grinding chamber through a conical feeding channel in the middle. The classifying chamber is also connected to the grinding chamber through an outer powder conveying channel. The classifying chamber has a feeding port and an air inlet. The discharge port of the discharge chamber is connected to the material inlet of the cyclone collector through a powder conveying pipe.

[0007] The circulating mill and drive unit are mounted on the same base; the bottom plate of the circulating mill is detachably and fixedly connected to the base; the bottom plate of the circulating mill is provided with a slag outlet, which is sealed by a plug; the lower part of the main shaft is connected to the bottom plate through a bottom bearing seat, and a seal is provided between the main shaft and the bottom plate; the lower end of the main shaft extends from the bottom bearing seat, and the extended end is provided with a cooling fan and a pulley, both of which are connected to the main shaft by a key; the drive unit is a motor, and a drive pulley is provided on the motor shaft, which is connected to the pulley on the main shaft by a belt; a pressure cover is provided on the top of the powder discharge chamber, and the pressure cover is detachably and fixedly connected to the top plate of the powder discharge chamber; the upper end of the main shaft is connected to the pressure cover through a top bearing seat, and a seal is provided between the main shaft and the pressure cover.

[0008] The breaker is provided with several hammerheads along the circumference, with the hammerheads positioned close to the inner wall of the grinding chamber, and the windward side of the hammerheads being an inclined surface that slopes backward and upward.

[0009] The grinding chamber and the classifying chamber are detachably connected; the crushing wall is suspended below the top plate of the grinding chamber, and multiple cutter heads are evenly arranged circumferentially on the lower part of the crushing wall. The cross-section of the cutter head is triangular, and the windward end of the cutter head has an acute angle structure.

[0010] Both the lower impeller and the upper impeller are composed of a wheel body and blades. Multiple blades are arranged radially around the wheel body, and the outer ends of the blades are inclined towards the windward side.

[0011] The air classifier cage is a rat cage structure, consisting of a cylinder, a base, a connecting frame, and scrapers. The bottom of the cylinder is provided with a base, which is connected to the main shaft by a key. Several scrapers are provided around the periphery of the cylinder, and the scrapers are connected to the cylinder by corresponding connecting frames. The scrapers are located close to the inner wall of the powder classifier chamber, and the upper end of the scrapers is inclined towards the windward side.

[0012] The powder outlet chamber and the powder selection chamber are detachably connected; the powder outlet chamber is a volute structure, the center line of the volute structure is coaxial with the center line of the main shaft, and the tangential outlet of the volute structure is the powder outlet.

[0013] The powder outlet chamber and the powder conveying pipe, as well as the powder conveying pipe and the cyclone collector, are all detachably connected.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) The main equipment, the circulating mill, adopts a circulating milling method. After the material enters the milling chamber, it is crushed twice and then enters the powder selection chamber. The fine powder flows upward and enters the cyclone collector through the powder outlet chamber as the product. The coarse powder falls into the milling chamber and is crushed again, thus ensuring the uniformity of the product particle size. It is especially suitable for processing grains with husks.

[0016] 2) The ultrafine circulating grinding device for grains integrates grinding, air separation, conveying and material collection functions. It can be driven by one drive unit to carry out production. The equipment has a compact structure, is easy to operate and has high production efficiency.

[0017] 3) The grinding chamber, powder classifier and powder outlet of the circulating mill, as well as the circulating mill, powder conveying pipeline and cyclone collector are all detachably connected, which makes maintenance convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the ultrafine circulating grinding device for grains described in this utility model.

[0019] Figure 2 This is a front sectional view of the circulating grinding mill described in this utility model.

[0020] Figure 3 This is a schematic cross-sectional view of the crushed wall described in this utility model.

[0021] Figure 4 This is a top view of the hydraulic breaker described in this utility model.

[0022] Figure 5a This is a front view of the powder selection chamber described in this utility model.

[0023] Figure 5b yes Figure 5a Top view.

[0024] Figure 6a This is a front view of the air separator cage described in this utility model.

[0025] Figure 6b yes Figure 6a Top view.

[0026] Figure 7This is a top view of the lower impeller (upper impeller) described in this utility model.

[0027] Figure 8 This is a top view of the conveying cavity described in this utility model.

[0028] In the diagram: 1. Circulating mill; 1-1. Grinding chamber; 1-2. Grinding chamber; 1-3. Grinding outlet chamber; 1-4. Main shaft; 1-5. Bottom bearing seat; 1-6. Top bearing seat; 1-7. Pressure cover; 1-8. Pulley; 1-9. Cooling fan; 1-10. Crusher; 1-11. Lower impeller; 1-12. Air classifier cage; 1-13. Upper impeller; 1-14. Crushing wall; 1-15. Grinding passage; 1-16. Feed inlet; 1-17. Cutting head; 1-18. Hammer head; 1-19. Air inlet; 1-20. Scraper; 1-21. Blade; 2. Drive unit; 3. Grinding pipeline; 4. Cyclone collector; 5. Base. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0030] like Figure 1 As shown, the ultrafine circulating grinding device for grains and cereals of this utility model includes a circulating grinding mill 1, a drive device 2, a powder conveying pipe 3, and a cyclone collector 4; Figure 2 As shown, the circulating mill 1 is arranged from bottom to top as follows: grinding chamber 1-1, classifying chamber 1-2, and discharge chamber 1-3. Grinding chamber 1-1 is equipped with a crusher 1-10, a crushing wall 1-14, and a lower impeller 1-11. Classifying chamber 1-2 is equipped with an air classifier 1-12. Discharge chamber 1-3 is equipped with an upper impeller 1-13. A main shaft 1-4 is vertically arranged in the middle of the circulating mill 1, and the bottom end of the main shaft 1-4 is connected to the drive device 2. The crusher 1-10, lower impeller 1-11, air classifier 1-12, and upper impeller 1-13 are arranged in sequence. 13 are all located on the main shaft 1-4 at corresponding positions and can rotate with the main shaft 1-4. The crushing wall 1-14 is a cylindrical structure, located above the crusher 1-10 and around the lower impeller 1-11. The crushing wall 1-14 is provided with multiple cutter heads 1-17 along its circumference. The bottom opening of the powder classifying chamber 1-2 is connected to the grinding chamber 1-1 through the conical feeding channel in the middle. The powder classifying chamber 1-2 is also connected to the grinding chamber 1-1 through the outer powder passing channel 1-15. The powder classifying chamber 1-2 is provided with a feeding port 1-16 and an air inlet 1-19 (e.g., ...). Figure 5a , Figure 5b (As shown); the powder outlet of the powder outlet chamber 1-3 is connected to the material inlet of the cyclone collector 4 through the powder conveying pipe 3.

[0031] The circulating mill 1 and the drive unit 2 are placed on the same base 5; the bottom plate of the circulating mill 1 is detachably fixed to the base 5; the bottom plate of the circulating mill 1 is provided with a slag outlet, which is sealed by a plug; the lower part of the main shaft 1-4 is connected to the base plate through a bottom bearing seat 1-5, and a seal is provided between the main shaft 1-4 and the base plate; the lower end of the main shaft 1-4 extends from the bottom bearing seat 1-5, and the extended end is provided with a cooling fan 1-9 and a pulley 1-8. 1-9 and pulley 1-8 are both connected to the main shaft 1-4 by a key; the drive device 2 is a motor, and the motor shaft is equipped with a drive pulley, which is connected to pulley 1-8 on the main shaft 1-4 by a belt; the top of the powder outlet chamber 1-3 is equipped with a pressure cover 1-7, and the pressure cover 1-7 is detachably fixed to the top plate of the powder outlet chamber 1-3; the upper end of the main shaft 1-4 is connected to the pressure cover 1-7 through the top bearing seat 1-6, and a seal is provided between the main shaft 1-4 and the pressure cover 1-7.

[0032] like Figure 4 As shown, the breaker 1-10 is provided with several hammer heads 1-18 along the circumferential direction. The hammer heads 1-18 are located close to the inner wall of the grinding chamber 1-1. The windward surface (front side along the rotation direction) of the hammer head 1-18 is an inclined surface that slopes backward and upward.

[0033] The grinding chamber 1-1 and the classifying chamber 1-2 are detachably connected; the crushing wall 1-14 is suspended below the top plate of the grinding chamber 1-1, and multiple cutter heads 1-17 are evenly arranged circumferentially on the lower part of the crushing wall 1-14 (e.g., ...). Figure 3 As shown, the cross-section of the cutter head 1-17 is triangular, and the windward end of the cutter head 1-17 has an acute angle structure.

[0034] like Figure 7 As shown, both the lower impeller 1-11 and the upper impeller 1-13 are composed of a wheel body and blades 1-21. Multiple blades 1-21 are arranged radially around the wheel body, and the outer ends of the blades 1-21 are inclined towards the windward side.

[0035] like Figure 6a , Figure 6b As shown, the air classifier 1-12 is a squirrel cage structure, consisting of a cylinder, a base, a connecting frame, and scrapers 1-20. The bottom of the cylinder is provided with a base, which is connected to the main shaft 1-4 by a key. Several scrapers 1-20 are provided around the outer periphery of the cylinder, and the scrapers 1-20 are connected to the cylinder by corresponding connecting frames. The scrapers 1-20 are located close to the inner wall of the powder classifier chamber 1-2, and the upper end of the scrapers 1-20 is inclined towards the windward side.

[0036] The powder outlet chamber 1-3 and the powder selection chamber 1-2 are detachably connected; such as Figure 8 As shown, the powder outlet chamber 1-3 is a volute structure, and the center line of the volute structure is coaxial with the center line of the main shaft 1-4. The tangential outlet of the volute structure is the powder outlet.

[0037] The powder outlet chamber 1-3 and the powder conveying pipe 3, as well as the powder conveying pipe 3 and the cyclone collector 4, are all detachably connected.

[0038] The working process of the ultrafine circulating grinding device for grains described in this utility model is as follows:

[0039] After the drive unit 2 is started, the drive unit 2 drives the main shaft 1-4 to rotate at high speed through the belt drive mechanism; the material to be ground is fed into the circulating mill 1 through the feed port 1-16 by a feeder (such as a feed belt conveyor). The material falls into the grinding chamber 1-1 at the bottom under the action of gravity, and is accelerated by the high-speed rotating lower impeller 1-11. After reaching a certain speed, it is thrown at high speed towards the outer crushing wall 1-14. The crushing wall 1-14 is fixed. The high-speed moving material hits the cutter head 1-17 on the crushing wall 1-14 to achieve the first crushing. When the heavier large-sized material falls to the bottom of the grinding chamber 1-1, it is crushed a second time under the impact of the crushing hammer 1-10 and the hammer head 1-18. The high-speed rotation of the lower impeller 1-11 acts as a blower, feeding the lighter, smaller particles after primary and secondary crushing into the classifying chamber 1-2 via the powder channel 1-15. The classifying chamber 1-2 has an air inlet 1-19, where the negative pressure generated by the rotating components draws air in for air classification. The selected fine powder rises into the outlet chamber 1-3 and, under the action of the upper impeller 1-13, is sent to the cyclone collector 4 via the powder conveying pipe 3, where it is collected as the product. The high-speed rotating air classifier cage 1-12 scrapes off material adhering to the inner wall of the air classifier chamber 1-2. Larger particles that fail to rise into the outlet chamber 1-3 are returned to the grinding chamber 1-1 via the conical feeding channel, thus achieving circulating grinding. Furthermore, the scraper 1-20 can be tilted to generate a downward pushing force, promoting the falling of larger particles. Larger particles that fall after air separation are further separated at the conical feed channel, making the air separation more thorough and reducing the number of material cycles. The bottom of the circulating mill 1 is equipped with a slag outlet, and the base 5 is equipped with an operating hole at the corresponding position. After the grinding operation is completed, the plug sealing the slag outlet can be removed to perform the slag cleaning operation.

[0040] In the ultrafine circulating grinding device for grains described in this utility model, the rotation speed of the main shaft 1-4 of the circulating grinding mill 1 is generally 60-100 m / s, and the product particle size can be adjusted within the range of 100 mesh to 1300 mesh. The particle size adjustment can be achieved by adjusting the structural parameters of the crushing wall 1-14, the lower impeller 1-11, and the air classifier 1-12.

[0041] The ultrafine circulating grinding device for grains described in this utility model can achieve whole-grain grinding of oily materials (such as soybeans) with skin, and can achieve ultrafine grinding of product particle size of more than 300 mesh. After grinding, cooked soybeans can be directly mixed with water to make soy milk.

[0042] The cyclone collector 4 described in this utility model is a commercially available finished product.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A grain ultrafine circulating grinding device, characterized in that, The system includes a circulating mill, a drive unit, a powder conveying pipeline, and a cyclone collector. The circulating mill is arranged from bottom to top as a grinding chamber, a classifying chamber, and a discharge chamber. The grinding chamber contains a crusher, a crushing wall, and a lower impeller; the classifying chamber contains an air classifier cage; and the discharge chamber contains an upper impeller. A main shaft is vertically positioned in the middle of the circulating mill, with its bottom end connected to the drive unit. The crusher, lower impeller, air classifier cage, and upper impeller are all located on the corresponding positions of the main shaft and can rotate with it. The crushing wall has a cylindrical structure, located above the crusher and around the lower impeller, and has multiple cutters along its circumference. The bottom opening of the classifying chamber connects to the grinding chamber through a central conical feeding channel. The classifying chamber also connects to the grinding chamber through an outer powder conveying channel. The classifying chamber has a feeding port and an air inlet. The discharge port of the discharge chamber is connected to the material inlet of the cyclone collector via a powder conveying pipeline.

2. The multi-cereal ultra-fine flour circulating grinding device according to claim 1, characterized in that, The circulating mill and drive unit are mounted on the same base; the bottom plate of the circulating mill is detachably and fixedly connected to the base; the bottom plate of the circulating mill is provided with a slag outlet, which is sealed by a plug; the lower part of the main shaft is connected to the bottom plate through a bottom bearing seat, and a seal is provided between the main shaft and the bottom plate; the lower end of the main shaft extends from the bottom bearing seat, and the extended end is provided with a cooling fan and a pulley, both of which are connected to the main shaft by a key; the drive unit is a motor, and a drive pulley is provided on the motor shaft, which is connected to the pulley on the main shaft by a belt; a pressure cover is provided on the top of the powder discharge chamber, and the pressure cover is detachably and fixedly connected to the top plate of the powder discharge chamber; the upper end of the main shaft is connected to the pressure cover through a top bearing seat, and a seal is provided between the main shaft and the pressure cover.

3. The multi-cereal ultra-fine flour circulating grinding device according to claim 1, characterized in that, The breaker is provided with several hammerheads along the circumference, with the hammerheads positioned close to the inner wall of the grinding chamber, and the windward side of the hammerheads being an inclined surface that slopes backward and upward.

4. The multi-cereal ultra-fine flour circulating grinding device according to claim 1, characterized in that, The grinding chamber and the classifying chamber are detachably connected; the crushing wall is suspended below the top plate of the grinding chamber, and multiple cutter heads are evenly arranged circumferentially on the lower part of the crushing wall. The cross-section of the cutter head is triangular, and the windward end of the cutter head has an acute angle structure.

5. The multi-cereal ultra-fine flour circulating grinding device according to claim 1, characterized in that, Both the lower impeller and the upper impeller are composed of a wheel body and blades. Multiple blades are arranged radially around the wheel body, and the outer ends of the blades are inclined towards the windward side.

6. The multi-cereal ultra-fine flour circulating grinding device according to claim 1, characterized in that, The air classifier cage is a rat cage structure, consisting of a cylinder, a base, a connecting frame, and scrapers. The bottom of the cylinder is provided with a base, which is connected to the main shaft by a key. Several scrapers are provided around the periphery of the cylinder, and the scrapers are connected to the cylinder by corresponding connecting frames. The scrapers are located close to the inner wall of the powder classifier chamber, and the upper end of the scrapers is inclined towards the windward side.

7. The multi-cereal ultra-fine flour circulating grinding device according to claim 1, characterized in that, The powder outlet chamber and the powder selection chamber are detachably connected; the powder outlet chamber is a volute structure, the center line of the volute structure is coaxial with the center line of the main shaft, and the tangential outlet of the volute structure is the powder outlet.

8. The multi-cereal ultra-fine flour circulating grinding device according to claim 1, characterized in that, The powder outlet chamber and the powder conveying pipe, as well as the powder conveying pipe and the cyclone collector, are all detachably connected.

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