Method and apparatus for powder mixing efficiency
By introducing a rotating mixing zone and an umbrella-shaped mixing zone into the powder mixing device, the problems of discontinuity and uniformity in the powder mixing process are solved, achieving a highly efficient and uniform powder mixing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XI AN JIAOTONG UNIV
- Filing Date
- 2024-01-18
- Publication Date
- 2026-06-23
AI Technical Summary
Existing powder mixing technologies suffer from problems such as discontinuous mixing, long processing time, poor batch quality stability, significant influence from container structure, and difficulties in industrialization. In particular, it is difficult to achieve high uniformity when mixing powders with large differences in particle size and density.
A powder mixing device is employed, comprising a cylindrical mixing tank, which is divided into a raw powder bin, a rotary mixing zone, an umbrella-shaped mixing zone, and a mixed material bin. The powder is broken up and crushed through the meshing of helical gears and reverse helical gears. Combined with the multiple fractionation and mixing in the umbrella-shaped mixing zone, the powder is ensured to achieve multiple fractionation and uniform mixing during linear motion.
It enables continuous and large-scale mixing of powders, improves mixing efficiency and uniformity, reduces separation tendency, and ensures the consistency and reliability of powder's linear operation during the mixing process.
Smart Images
Figure CN117797674B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of material mixing technology, and specifically relates to a method and apparatus for efficient powder mixing. Background Technology
[0002] Powder metallurgy, as a crucial method for preparing metallic materials, boasts significant advantages such as low forming temperature, simple alloying, and no segregation. Powder mixing is a fundamental process, applied not only to alloy composition mixing but also to batch mixing. Therefore, the quality (e.g., uniformity) and efficiency of powder mixing have a critical impact on the preparation of powder metallurgy materials. Powder mixing generally refers to the process of uniformly distributing powders with different physical and chemical properties in space, and it is the most basic and important step in the powder metallurgy process. In recent years, with the development of powder metallurgy technology, numerous new technologies and processes have emerged. In particular, the further development and application of high-entropy alloys have led to an increasing number of doped elements, larger equimolar ratios of components, and gradually increasing differences in particle size and density. This places higher demands on the uniformity of powder mixing, posing a serious challenge to traditional powder mixing techniques. Therefore, improving the uniformity of mixed powders, reducing component segregation, and enhancing the density, uniformity, and various properties of sintered samples have become an important direction for the development of the powder metallurgy field.
[0003] The powder mixing process is a continuous cycle of breaking down agglomerates, fragmenting, and mixing. During mixing, powders not only mix with each other, but also undergo impact and friction to break down weak agglomerates and brittle powders. Powder mixing is mainly divided into wet mixing and dry mixing, with wet mixing generally considered superior to dry mixing. Dispersants can be added during wet mixing to weaken the influence of density or particle size on the uniformity of powder mixing under the interference of a third party. Compared to wet mixing, dry mixing does not add other components, has a shorter process, and is simpler to operate, making it a more commonly used mixing method. Dry powder mixing is a physical process. Commonly used powder mixing techniques include three-dimensional mixing, double-cone mixing, ball milling, and dual-motion mixing. The principle is that stirring and the movement of the mixing container cause powder particles to undergo impact, shearing, and rotational movements in different directions within the mixing container, resulting in a random distribution of powder particles of different components within the container according to their different motion trajectories, thereby improving the uniformity of the powder.
[0004] Mechanical alloying (MA) technology is a typical solid-solid mixing technique based on this principle, and is considered a more uniform powder solid-solid mixing technology. It achieves homogeneity of composition primarily through the repeated crushing, welding, and re-crushing of different powders. It not only mixes powders but also forms solid solutions. However, existing powder mixing technologies have several drawbacks. First, the mixing process is discontinuous. Mixing is done one batch at a time in closed containers of different shapes and with varying motion patterns. Second, it is time-consuming. Achieving homogeneity through the random distribution of powder particles during movement requires prolonged and repeated motion to reach a certain level of uniformity. Third, due to the influence of the container and directional guidance structure, the stress and influence on powder in different areas vary, inevitably resulting in parts that do not participate in mixing or are insufficiently moved, leading to material inclusions and uneven mixing in some areas. Fourth, the batch-to-batch quality stability is poor. Furthermore, due to low production volume, industrialization is difficult, and it is mainly used as laboratory mixing equipment. Generally, there is no pretreatment or the pretreatment is done manually. In addition, the ambient temperature, humidity, and material characteristics (such as viscosity and adhesion) have a significant impact on the mixing process, greatly affecting the uniformity of the mixture and causing fluctuations in production quality. The above problems are particularly serious when mixing components with large differences in particle size and density.
[0005] Improving the uniformity of powder mixing has always been a long-term goal in the powder preparation industry, and professionals have conducted extensive research and development, mainly focusing on three aspects: mixing methods, internal structure, and processes. Regarding mixing methods, double-cone mixers, V-type mixers, inclined mixers, rolling mixers, and high-energy ball mills have been developed. In terms of internal structure, internal guide plates are installed to increase the flow direction of powder, thus enhancing the mixing process. Regarding processes, the mixing effect is improved by adding pretreatment methods and controlling the mixing process. In recent years, two powder brushing and sieving mixing technologies and devices have emerged, breaking with traditional preparation methods, and are briefly introduced below.
[0006] The "Sieving Device (CN205199881U)" designed by Zhengzhou Abrasives & Grinding Research Institute Co., Ltd. uses pre-pressure applied by brushes to drive cross-mixing of powders. Under the action of the brushes, the powder passes through a standard sieve into a powder container. This sieving device solves the problems of poor process stability and low production efficiency in manual sieving, realizes the mechanization of sieving operations, stabilizes the sieving process, and improves production efficiency. The "Powder Brush Screening and Mixing Device and Method (CN108339479A)" designed by Guoji Intelligent Technology Research Institute Co., Ltd. After the powder material enters the sieve body, it is mixed and screened into the receiving device by the rotation of the brush body. It is not limited by the structure of the container and can remove the influence of mixing dead corners through the brush body, improving mixing efficiency and uniformity. However, the powder mixing uniformity of the "Sieving Device (CN205199881U)" designed by Zhengzhou Abrasives & Grinding Research Institute Co., Ltd. is significantly affected by the number of mixing cycles; compared with multiple repetitions, the uniformity of a single mixing cycle is seriously insufficient. The "Powder Brush Screening Mixing Device and Method (CN108339479A)" from the China National Machinery Industry Intelligent Technology Research Institute Co., Ltd. has a limited number of upper powder silos, which cannot be infinitely reduced in size. Therefore, after brushing, along the direction of brush rotation, the powder under the sieve will have enrichment and cross-regions of adjacent powders, making uniform mixing impossible. Furthermore, due to the limited ability of the brush to break up and crush agglomerates and brittle particles, large-diameter agglomerates remain on the sieve, leading to problems such as sieve clogging. While the above two powder brush screening mixing devices and methods represent some improvement over traditional mixing technology, converting the long-term mixing process into a one-time process to improve efficiency, their application prospects remain questionable. This is because high uniformity cannot be achieved through one-time mixing unless molecular-level mixing is achieved through coordination chemistry. Therefore, they can only be used as a pretreatment method for powder mixing.
[0007] Analysis of traditional solid-solid mixing technology and the aforementioned patented technology, combined with the characteristics of solid-solid mixing, reveals that the uniformity of powder mixing is closely related to the properties of the powder and the number of cross-linkings between different powders. Theoretically, prolonged mixing can achieve extremely uniform powder particle size, but this is not the case in practice. Regarding particle size, when the particle size is smaller than a certain scale, the specific surface area continuously increases. When the particle size reaches a critical point, a dynamic equilibrium between polymerization and depolymerization occurs, causing particle size refinement to cease. Regarding uniformity, due to differences in intrinsic properties such as density and viscosity, a dynamic equilibrium between mixing and separation occurs after a certain mixing time, reaching a mixing bottleneck. In actual production, due to cost considerations, the mixing process ends before reaching the equilibrium between polymerization and depolymerization. For traditional solid-solid mixing equipment, whether it's a double-cone mixer, V-type mixer, inclined mixer, rolling mixer, or high-energy ball mill, all mixing equipment generally requires a loading capacity of less than 60%, with approximately 40% reserved for powder flow and mixing. However, due to differences in powder position, particle size, density, and viscosity during the mixing process, the powder's trajectory differs under the same force field (direct or indirect action). Therefore, in the same mixer, the powder does not always follow a predetermined trajectory. In approximately 40% of the reserved space, the powder exhibits both mixing and separation tendencies. From the powder's perspective, large particle size differences lead to significant differences in surface energy, making homogeneous, fine-sized powders more prone to agglomeration rather than adsorption between larger and smaller particles. When density differences are large, powders of different densities have different momentum and trajectories under the same external force, making effective mixing difficult. The separation problem is particularly pronounced when mixing large-particle, high-density powders with small-particle, low-density powders. Summary of the Invention
[0008] The purpose of this invention is to provide a method and apparatus for efficient powder mixing. This invention can achieve spatiotemporal component and linear small-volume mixing of different powders, maximize the reduction of separation tendency, and greatly improve the uniformity of powder mixing.
[0009] To achieve the above objectives, the present invention provides a powder mixing device, comprising a cylindrical mixing tank body, wherein the mixing tank body is provided with, from top to bottom, a connected original powder bin for distributing powder, a rotary mixing zone for crushing and mixing powder, an umbrella-shaped mixing zone for multiple fixed-line mixing and mixing of powder, and a mixing bin for collecting mixed powder.
[0010] The rotary mixing zone includes a mixing platform that rotates via a rotating shaft. A helical gear is provided on the outer curved surface of the lower truncated cone of the mixing platform. A ring-shaped inner bearing is provided at a corresponding position on the inner wall of the cylindrical mixing tank. A ring-shaped reverse helical gear that can rotate with the helical gear and meshes with the helical gear is provided on the bearing. A "windmill-shaped" groove for quantitative extraction of powder is provided on the bottom surface of the mixing platform. A conical collection chamber connected to the lower truncated cone is provided below the mixing platform. An outlet for powder to fall into the umbrella-shaped mixing zone is opened at the axial position of the conical collection chamber.
[0011] The original powder bin consists of several equally distributed bins. Each distributed bin has a wedge-shaped cross-section along the axis of the cylindrical mixing tank. Each distributed bin has an inlet, and an outlet for the powder to fall into the rotating mixing zone is provided between the wedge-shaped bottom plate of the distributed bin and the inner wall of the cylindrical mixing tank.
[0012] The umbrella-shaped mixing zone includes several sets of positive umbrella-shaped conical plates and inverted umbrella-shaped conical plates, each with grooves on its surface along the umbrella frame direction. The diameter of the positive umbrella-shaped conical plate is smaller than that of the inverted umbrella-shaped conical plate. The umbrella edges between adjacent grooves of the positive umbrella-shaped conical plate and the umbrella center between adjacent grooves of the inverted umbrella-shaped conical plate are provided with serrated openings. The umbrella center of the inverted umbrella-shaped conical plate is provided with a discharge port that communicates with the mixing silo.
[0013] The mixing platform also includes an upper cone for guiding the powder discharged from the outlet to the gap between the lower frustum and the inner wall of the cylindrical mixing tank. The angle between the generatrix of the upper cone and the horizontal plane is consistent with the angle between the wedge-shaped bottom plate of the distribution bin and the horizontal plane.
[0014] The horizontal angle of the wedge-shaped bottom plate of each material distribution bin is greater than the powder's angle of repose.
[0015] The rotating shaft passes through the top of the mixing tank body and is connected to a rotary drive device for driving the mixing platform to rotate.
[0016] The grooves of the upright umbrella-shaped conical plate and the inverted umbrella-shaped conical plate are several equal grooves of the same depth.
[0017] The mixing silo has a mixing powder inlet at the top corresponding to the center of the inverted umbrella-shaped conical plate, and a mixing powder outlet at the bottom side of the mixing silo.
[0018] A method for improving the efficiency of powder mixing includes the following steps:
[0019] Step 1: Determine the number of dispensing bins needed for two or more powders based on the required powder ratio, and load the powders into different dispensing bins according to the principle of filling different powders at intervals.
[0020] Step 2: Turn on the power, and the mixing table starts to rotate. Under the action of gravity, the powder from each bin enters the gap between the helical gear and the reverse helical gear of the lower circular platform from the discharge port. Under the meshing action, the large-diameter agglomerates are broken up and the large-diameter powder is crushed, and the first mixing occurs between the gears.
[0021] Step 3: After being broken down and crushed, the powder falls into the conical collection chamber under the action of gravity. It is quantitatively extracted by the "windmill-shaped" groove of the conical collection chamber and gathers towards the axis of the conical collection chamber, where secondary mixing is completed.
[0022] Step 4: The powder falls from the center of the conical collection chamber to the umbrella-shaped mixing zone, where it spreads out at the top of the upright umbrella-shaped conical plate to form a secondary component. After the secondary component, the powder slides down the grooves on the surface of the upright umbrella-shaped conical plate to the edge of the plate. The serrated openings on the edge of the upright umbrella-shaped conical plate cause the adjacent grooves to have different lengths, resulting in a time difference when the powder falls. The falling powder undergoes a third mixing as it enters the inverted umbrella-shaped conical plate and is further componentized by the adjacent grooves of the inverted umbrella-shaped conical plate. Similarly, due to the different lengths of the adjacent grooves of the inverted umbrella-shaped conical plate, the powder from the adjacent grooves converges at the center of the inverted umbrella-shaped conical plate for a fourth mixing.
[0023] Step 5: The mixed powder enters the mixing silo through the mixed powder inlet.
[0024] Compared with the prior art, the present invention has the following beneficial effects:
[0025] (1) The present invention divides the mixing device into an original powder bin, a rotary mixing zone, an umbrella-shaped mixing zone and a mixing bin. Through the helical gear of the mixing table and the reverse helical gear meshing with the inner wall of the mixing tank, large-particle powder is pre-crushed and broken to reduce the particle size difference. The powder is multi-component and mixed through the umbrella-shaped mixing zone. The crushing, breaking and mixing of powder in the powder mixing process are integrated into one, which subverts the way of mixing powder one bin at a time, realizes continuous and large-scale powder mixing, and improves mixing efficiency.
[0026] (2) This invention uses a distribution bin to pre-process the powder into portions. After being crushed by the mixing table, the powder undergoes a first mixing and falls into a conical collection bin under gravity. It is quantitatively extracted by the "windmill-shaped" grooves of the conical collection bin and converges towards the center of the conical collection bin to complete a second mixing. Then, the powder falls to the top of the umbrella-shaped conical plate and disperses to form a second portion. The serrated openings on the umbrella edge between adjacent grooves of the umbrella-shaped conical plate make the lengths of adjacent grooves different. There is a time difference when the powder falls. A third mixing occurs during the process of entering the inverted umbrella-shaped conical plate and is further portioned by the grooves of the inverted umbrella-shaped conical plate. Similarly, when the powder converges to the center of the inverted umbrella-shaped conical plate, the lengths of adjacent grooves are different, resulting in a fourth mixing. This increases the number of powder mixing times and achieves uniform and efficient powder mixing.
[0027] (3) The present invention uses the design of the conical collection chamber “windmill-shaped” groove and the umbrella-shaped mixing zone surface groove. The powder is quantitatively extracted in the “windmill-shaped” groove and mixed in the center of the conical collection chamber. The powder is then moved in a fixed line through the groove of the umbrella-shaped mixing zone to complete multiple fractionation and mixing. This ensures the consistency and reliability of the powder’s fixed line running path and avoids the duality of mixing and separation of powders of different particle sizes and densities in traditional powder mixing. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of a powder mixing high-efficiency device according to the present invention;
[0029] Figure 2 This is a top view of the "windmill-shaped" groove on the bottom surface of the mixing table in the device of the present invention;
[0030] Figure 3 This is a top view of the conical surface of the umbrella-shaped mixing zone in the device of the present invention;
[0031] Figure 4 This is a top view of the inverted conical surface of the umbrella-shaped mixing zone in the device of the present invention;
[0032] In the diagram: 1-Original powder silo; 11-Inlet; 12-Outlet; 2-Rotary mixing zone; 21-Rotary drive device; 22-Rotary shaft; 23-Helical gear; 24-Conical collection silo; 3-Umbrella-shaped mixing zone; 31-Upright umbrella-shaped conical plate; 32-Inverted umbrella-shaped conical plate; 4-Mixed material silo; 41-Mixed powder inlet; 42-Mixed powder outlet. Detailed Implementation
[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0034] like Figure 1The powder mixing high-efficiency device described in this embodiment includes a cylindrical mixing tank body. From top to bottom, the mixing tank body is sequentially arranged with a connected initial powder bin 1, a rotary mixing zone 2, an umbrella-shaped mixing zone 3, and a mixing material bin 4. The rotary mixing zone 2 includes a mixing platform that rotates via a rotating shaft 22. The annular area located on the upper part of the mixing platform and between the cylindrical mixing tank wall and the rotating shaft 22 is the initial powder bin 1. The initial powder bin 1 consists of several equally spaced distribution bins. Two types of powder can be placed alternately, and multiple types of powder can be placed sequentially. The distribution bins divide the powder into smaller portions, allowing for better contact and uniform mixing of the two or more powders subsequently. Each distribution bin has an inlet 11, allowing for simultaneous feeding and accelerating the feeding speed. Each feed bin has a wedge-shaped cross-section along the axis of the cylindrical mixing tank. The horizontal angle of the wedge-shaped bottom plate is greater than the powder's angle of repose. This design reduces powder accumulation and improves powder flowability when the powder falls under gravity. A discharge port 12 is provided between the wedge-shaped bottom plate of each feed bin and the inner wall of the cylindrical mixing tank for the powder to fall into the rotating mixing zone 2.
[0035] The rotating shaft 22 of the rotating mixing zone 2 passes through the top of the mixing tank body and is connected to the rotating drive device 21 used to drive the mixing platform to rotate. The mixing platform of the rotating mixing zone 2 is composed of a composite of an upper cone and a lower truncated cone. The angle between the generatrix of the upper cone and the horizontal plane and the angle between the wedge-shaped bottom plate of the distribution bin and the horizontal plane are matched. The upper cone is used to guide the powder discharged from the discharge port 12 of each distribution bin in the upper layer to the gap between the lower truncated cone and the inner wall of the cylindrical mixing tank. A helical gear 23 is provided on the outer curved surface of the lower truncated cone. A ring-shaped inner bearing is provided at the corresponding position on the inner wall of the cylindrical mixing tank. A ring-shaped reverse helical gear that can rotate with the helical gear 23 and meshes with the helical gear 23 is provided on the bearing. A conical collection bin 24 connected to the lower truncated cone is provided below the mixing platform. This design is used to break up and crush the powder discharged through the discharge port 12 under the action of gravity, reduce the particle size difference of the powder. The particle size of the powder after breaking up and crushing can be controlled by changing the gear size and the gap size. Figure 2 As shown, a conical collection chamber 24 is provided below the mixing platform of the rotary mixing zone 2. The conical collection chamber 24 is provided with a "windmill-shaped" groove. When the crushed powder falls into the conical collection chamber 24, it is quantitatively extracted by the "windmill-shaped" groove of the conical collection chamber 24. The amount extracted by different powders is related to the fan-shaped area occupied by the powder chamber. A discharge port is opened at the axial position of the conical collection chamber 24 for the powder to fall into the umbrella-shaped mixing zone 3.
[0036] The umbrella-shaped mixing zone 3 is located directly below the discharge port of the rotating mixing zone 2. It consists of two umbrella-shaped conical plates, each with several equally spaced and deep grooves along the umbrella-shaped frame. The upper part is "upright umbrella-shaped," and the lower part is "inverted umbrella-shaped," used for further dispensing and mixing of the powder. Figure 3 ,4 As shown, the diameter of the upright umbrella-shaped conical plate 31 is smaller than that of the inverted umbrella-shaped conical plate 32, which ensures that the powder falls from the upright umbrella-shaped conical plate 31 to the inverted umbrella-shaped conical plate 32. The umbrella edges between adjacent grooves of the upright umbrella-shaped conical plate 31 and the umbrella center between adjacent grooves of the inverted umbrella-shaped conical plate 32 are provided with serrated openings. Due to the different groove lengths corresponding to the tooth tips and tooth roots, there will be a time difference when the powder slides down the adjacent grooves, which can improve the uniformity of powder mixing. As the number of the above-mentioned "umbrella-shaped" structures increases, the mixing uniformity increases sharply.
[0037] The mixing silo 4 is located directly below the center of the inverted umbrella-shaped conical plate 32. A powder inlet 41 is located at the top of the mixing silo 4, corresponding to the center of the inverted umbrella-shaped conical plate 32. A powder outlet 42 is located on the bottom side of the mixing silo 4 for discharging the powder. To prevent further separation of the powder due to differences in density and particle size, the diameter and height of the mixing silo 4 should not be too large. If it is necessary to prepare excessively large blanks, a mechanical structure can be used to lay the powder line by line, which can prevent further separation.
[0038] The specific steps for using this device are as follows:
[0039] Step 1: Based on the required powder ratio, determine the number of distribution bins needed for two or more powders. According to the principle of filling different powders at intervals, load the powders from the feed inlet 11 into different distribution bins. The ratio of powder amounts is determined by the ratio of the sector area occupied by the bins.
[0040] Step 2: Turn on the power. The rotary drive device 21 drives the mixing table to start rotating via the rotary shaft 22. The powder from each bin of the original powder bin 1 falls from the outlet 12 under the action of gravity, and is then guided by the upper cone into the gear gap between the inner wall of the truncated cone and the cylindrical mixing tank. Under the meshing action of the two gears, the agglomeration of large-diameter agglomerates and the crushing of large-diameter powder occur, and the first mixing takes place between the gears.
[0041] Step 3: After being broken down and crushed, the powder falls into the conical collection chamber 24, where it is quantitatively extracted by the "windmill-shaped" groove and gathers towards the center of the conical collection chamber 24. During this process, due to the inclined angle of the bottom surface being high around the perimeter and low in the middle, the powder is broken down and crushed a second time, and finally the second mixing is completed through the discharge port at the center of the conical collection chamber 24.
[0042] Step 4: The powder falls from the center of the conical collection chamber 24 to the umbrella-shaped mixing zone 3. Under the action of gravity, it disperses at the top of the umbrella-shaped conical plate 31 to form a secondary component. After the secondary component, the powder slides down the groove of the umbrella surface of the umbrella-shaped conical plate 31 to the edge of the umbrella. Because the lengths of the adjacent grooves corresponding to the tips and roots of the serrated openings on the edge of the umbrella are different, there is a time difference when the powder in the adjacent grooves falls at the top of the umbrella of the umbrella-shaped conical plate 31 at the same time and place. The falling powder undergoes a third mixing during the process of entering the inverted umbrella-shaped conical plate 32 and is further componentized by the adjacent grooves of the inverted umbrella-shaped conical plate 32. Similarly, because the lengths of the adjacent grooves of the inverted umbrella-shaped conical plate 32 are different, the powder in the adjacent grooves undergoes a fourth mixing when it converges to the center of the umbrella of the inverted umbrella-shaped conical plate 32.
[0043] Step 5: The mixed powder enters the mixing silo 4 through the mixed powder inlet 41, and the collected mixed powder can be discharged from the mixed powder outlet 42.
[0044] Improving powder mixing efficiency hinges on resolving the inherent contradiction between mixing and separation—that is, enhancing the mixing tendency while minimizing the separation tendency. This invention addresses this by reducing pre-mixed space, providing a highly efficient powder mixing method and apparatus. The apparatus's key feature is its multiple-partitioning process. Firstly, pre-mixed powder is loaded into distribution bins as much as possible for pre-partitioning. Secondly, all powder is quantitatively extracted through the "windmill-shaped" grooves of a conical collection bin, and then undergoes multiple parts-mixing and mixing via a fixed-path movement through the grooves of an umbrella-shaped mixing zone. This ensures the consistency and reliability of the powder's path, maximizing the reduction of separation tendency and significantly improving mixing uniformity. The mixing method involves distributing powder into different distribution bins, then performing agglomeration and crushing treatment on a mixing platform for initial mixing. Next, the powder is quantitatively extracted through the "windmill-shaped" grooves of the conical collection bin. The powder then undergoes multiple parts-mixing and mixing in the umbrella-shaped mixing zone, finally converging into a mixing bin area, achieving uniform and efficient powder mixing.
Claims
1. A powder mixing high-efficiency device, characterized in that, The mixing tank includes a cylindrical mixing tank body, which is provided from top to bottom with a connected original powder bin (1) for storing powder in separate compartments, a rotary mixing zone (2) for crushing and mixing powder, an umbrella-shaped mixing zone (3) for multiple fixed-line component mixing and powder mixing, and a mixing bin (4) for collecting mixed powder. The original powder bin (1) is composed of several equal distribution bins. Each distribution bin has a wedge-shaped cross section along the axis of the cylindrical mixing barrel. Each distribution bin has an inlet (11). An outlet (12) for the powder to fall into the rotating mixing zone (2) is opened between the wedge-shaped bottom plate of the distribution bin and the inner wall of the cylindrical mixing barrel. The rotary mixing zone (2) includes a mixing platform that rotates via a rotating shaft (22). The outer curved surface of the lower truncated cone of the mixing platform is provided with a helical gear (23). A ring-shaped inner bearing is provided at the corresponding position on the inner wall of the cylindrical mixing tank. A ring-shaped reverse helical gear that can rotate with the helical gear (23) and meshes with the helical gear (23) is provided on the bearing. A "windmill-shaped" groove for quantitative extraction of powder is provided on the bottom surface of the mixing platform. A conical collection chamber (24) connected to the lower truncated cone is provided below the mixing platform. An outlet for powder to fall into the umbrella-shaped mixing zone (3) is opened at the axial position of the collection chamber. The mixing platform also includes an upper cone for guiding the powder discharged from the outlet (12) to the gap between the lower frustum and the inner wall of the cylindrical mixing tank. The angle between the generatrix of the upper cone and the horizontal plane is consistent with the angle between the wedge-shaped bottom plate of the distribution bin and the horizontal plane. The umbrella-shaped mixing zone (3) includes several sets of positive umbrella-shaped conical plates (31) and inverted umbrella-shaped conical plates (32) with grooves on their surfaces along the direction of the umbrella frame. The diameter of the positive umbrella-shaped conical plate (31) is smaller than that of the inverted umbrella-shaped conical plate (32). The umbrella edges between adjacent grooves of the positive umbrella-shaped conical plate (31) and the umbrella core between adjacent grooves of the inverted umbrella-shaped conical plate (32) are provided with serrated openings. The umbrella core of the inverted umbrella-shaped conical plate (32) is provided with a discharge port that is connected to the mixing bin (4).
2. The powder mixing high-efficiency device according to claim 1, characterized in that, The horizontal angle of the wedge-shaped bottom plate of each material distribution bin is greater than the powder's angle of repose.
3. The powder mixing high-efficiency device according to claim 1, characterized in that, The rotating shaft (22) passes through the top of the mixing tank body and is connected to a rotary drive device (21) for driving the mixing platform to rotate.
4. The powder mixing high-efficiency device according to claim 1, characterized in that, The grooves of the upright umbrella-shaped conical plate (31) and the inverted umbrella-shaped conical plate (32) are a number of equal and equally deep grooves.
5. The powder mixing high-efficiency device according to claim 1, characterized in that, The mixing silo (4) has a mixing powder inlet (41) at the top corresponding to the center of the inverted umbrella-shaped conical plate (32), and the mixing powder outlet (42) is provided on the bottom side of the mixing silo (4).
6. The apparatus according to any one of claims 1-5 implements a method for achieving highly efficient powder mixing, characterized in that, Includes the following steps: Step 1: Determine the number of dispensing bins needed for two or more powders based on the required powder ratio, and load the powders into different dispensing bins according to the principle of filling different powders at intervals. Step 2: Turn on the power and the mixing table starts to rotate. Under the action of gravity, the powder from each hopper enters the gap between the helical gear (23) and the reverse helical gear of the lower truncated cone from the discharge port (12). Under the meshing action, the large-diameter agglomerates are broken up and the large-diameter powder is crushed, and the first mixing occurs between the gears. Step 3: After being broken down and crushed, the powder falls into the conical collection chamber (24) under the action of gravity, is quantitatively extracted by the "windmill-shaped" groove, and gathers towards the axis of the conical collection chamber (24), where secondary mixing is completed. Step 4: The powder falls from the center of the conical collection chamber (24) to the umbrella-shaped mixing zone (3), and spreads out at the top of the umbrella-shaped conical plate (31) to form a secondary component. The powder after the secondary component slides down the umbrella surface groove of the umbrella-shaped conical plate (31) to the umbrella edge of the umbrella-shaped conical plate (31). The sawtooth openings on the umbrella edge between adjacent grooves of the umbrella-shaped conical plate (31) make the lengths of adjacent grooves different, resulting in a time difference when the powder falls. The falling powder undergoes a third mixing during the process of entering the inverted umbrella-shaped conical plate (32) and is further componentized by the adjacent grooves of the inverted umbrella-shaped conical plate (32). Similarly, due to the different lengths of adjacent grooves of the inverted umbrella-shaped conical plate (32), the powder from adjacent grooves converges to the center of the inverted umbrella-shaped conical plate (32) for a fourth mixing. Step 5: The mixed powder enters the mixing silo (4) through the mixed powder inlet (41).