Mixing machine

Abstract

The utility model relates to the technical field of powder preparation, and discloses a blender mixer which comprises a cylinder body, a main shaft rotating assembly and a plurality of groups of fly cutter rotating assemblies, the main shaft rotating assembly is arranged at the center of the cylinder body, and the fly cutter rotating assemblies are arranged on the side wall of the cylinder body. The outer wall of the barrel is connected with a barrel rotating motor used for controlling the barrel to rotate, through superposition of triple rotation of the barrel, the main shaft and the fly cutters, the problem of arching in the powder mixing process is solved, uniform mixing of powder with large density difference is achieved, and the production quality of powder products is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder preparation, and in particular relates to a mixer. Background Art

[0002] In the industrial production process, it is often necessary to mix various types of powder materials. The uniformity of powder mixing has an important impact on product quality, and this impact is particularly significant in the production process of aluminum nitride powder. At present, the main methods for synthesizing aluminum nitride powder include carbon thermal reduction, direct nitridation of aluminum powder, self-propagating high-temperature synthesis, and chemical vapor deposition. Among them, the carbon thermal reduction method is one of the most commonly used preparation methods in large-scale industrial production due to its wide source of raw materials, low cost, insensitivity to process conditions, and good stability. In the carbon thermal reduction method, alumina powder and carbon black powder need to be mixed. Uneven mixing will significantly affect the aluminum nitride powder synthesis process, including reducing reaction efficiency and product purity.

[0003] At present, high-frequency vibration mixers are generally used to mix carbon black and alumina particles. Although vibration mixers can use vibration force to produce shear and rolling mixing effects, for alumina powder and carbon black powder with large density differences, relying solely on vibration force cannot completely overcome the separation trend between particles, resulting in some materials being unable to fully participate in the mixing process, reducing the mixing uniformity. Utility Model Content

[0004] The purpose of the utility model is to solve the problem of uneven mixing effect when high-frequency vibration mixers in the prior art mix powders with large density differences such as alumina and carbon black, and to provide a mixer that achieves uniform mixing of powders with large density differences, thereby improving the production quality of powder products.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A mixer includes a barrel, a main shaft rotating assembly and multiple sets of flying knife rotating assemblies. The main shaft rotating assembly is arranged at the center of the barrel, the flying knife rotating assemblies are arranged on the inner wall of the barrel, and the outer wall of the barrel is connected to a barrel rotating motor for controlling the rotation of the barrel.

[0007] When mixing powders, first add the powder to be mixed into the cylinder, and then start the cylinder rotating motor, the main shaft rotating assembly and the flying knife rotating assembly at the same time. One end of the cylinder rotating motor is connected to the cylinder, and the other end is fixedly connected to the external load-bearing structure to maintain the overall stability. The cylinder as a whole rotates around the fixed end of the cylinder motor, and the cylinder itself, the main shaft rotating assembly arranged at the center of the cylinder and the flying knife rotating assembly arranged on the side wall of the cylinder rotate at the same time. Combined with the gravity of the powder material itself, the material produces complex movement in the cylinder, including convection, shear, diffusion, etc., thereby overcoming the separation tendency between powder particles and realizing rapid and uniform mixing between powders with large density differences. At the same time, the rotating cylinder will destroy the arch structure commonly seen in the powder processing process, to avoid the powder in the arch part from participating in the mixing process, affecting the product mixing uniformity.

[0008] Furthermore, the spindle rotation assembly includes a spindle, a spindle rotation motor, and spiral blades. The spindle rotation motor is mounted on the outer wall of the barrel and connected to the spindle, and the spiral blades are arranged spirally around the spindle. The spindle rotation motor is connected to the spindle, driving the rotating blades mounted on the spindle. The spiral blades can stir the powder at various locations within the mixer, providing multiple stirring effects and improving powder mixing efficiency.

[0009] Furthermore, the section of the spiral blade close to the main shaft rotating motor is the front blade, and the section away from the main shaft rotating motor is the rear blade. A middle blade is provided between the front blade and the rear blade, and the pitch of the front blade is greater than the pitch of the middle blade, and the pitch of the front blade is equal to the pitch of the rear blade. The spiral blade is divided into at least three sections on the main shaft, and the pitches of the front blade, the middle blade, and the rear blade are different, so that different mixing effects can be achieved in different sections, and ultimately the purpose of overall uniform mixing is achieved. The front and rear sections are close to the inlet and outlet, and use a larger pitch to prevent the material from accumulating and clogging between the spiral blades, which is beneficial to the transportation of the material. The pitch of the middle section gradually decreases to increase the residence time of the material and the degree of mixing uniformity.

[0010] Furthermore, the diameter of the front blades is larger than that of the middle blades, and the diameter of the front blades is equal to that of the rear blades. The front and rear blades have larger diameters, closer to the inner diameter of the cylinder, to increase the space occupied by the spiral blades within the cylinder, reduce the chance of small particles being squeezed by larger particles, and enable faster material conveying. The diameter of the middle blades is slightly smaller to increase the flow and mixing of materials between the blades.

[0011] Furthermore, the thickness of the front blade is smaller than that of the middle blade, and the thickness of the front blade is equal to that of the rear blade. During powder mixing, the middle blade is most susceptible to uneven mixing, such as agglomeration, and severe powder accumulation, requiring greater mixing force. The thickness of the front and rear blades increases toward the middle blade to ensure effective mixing of powders with significantly different densities.

[0012] Furthermore, the spiral blade is provided with a plurality of notches at equal intervals. The spiral blade with notches can increase the disturbance of the material and prevent light materials from floating up too quickly or heavy materials from sinking too quickly.

[0013] Furthermore, the flying knife rotating assembly is symmetrical about the main axis, and the flying knife rotating assembly includes a flying knife shaft, a flying knife, and a flying knife rotating motor for controlling the rotation of the flying knife shaft. The flying knife rotating motor is arranged on the outer wall of the cylinder and connected to the flying knife shaft. The flying knife is arranged on the flying knife shaft, and the central axis of the flying knife shaft is perpendicular to the central axis of the main shaft. The flying knife rotating assembly is installed on the side wall of the cylinder and is symmetrical about the main axis. The flying knife rotates at a high speed, which generates a strong pressure to gather the materials from both sides to the center. If there are large agglomerates, they will be broken up by the flying knife. The flying knife shaft is connected to an independent motor, rather than being driven to rotate by the main shaft rotating motor. This design allows the flying knife to rotate at a higher speed than the main shaft, thereby enhancing its scattering and shearing effects, and more effectively processing materials close to the wall, reducing dead angles in the mixer.

[0014] Furthermore, the blades are provided in multiple groups on the blade shaft, each of which is in a strip-like structure. The multiple groups of strip-like blades enhance the shearing effect on the mixed material, significantly improving mixing efficiency and uniformity when mixing powders with widely varying densities, such as carbon black and aluminum oxide particles.

[0015] Furthermore, the cylinder is a polyhedral structure. The sharp corners of the polyhedral cylinder can increase the tumbling and shearing effect of the material in the cylinder, helping to break up material agglomerations and improve mixing uniformity. This is particularly beneficial for mixing materials with large density differences. At the same time, the sharp corners of the polyhedral cylinder help to break up material arches and improve material fluidity.

[0016] Furthermore, the outer wall of the barrel is provided with an inlet and outlet, and a detachable pre-mixing device is installed at the inlet and outlet. The inlet and outlet are provided on the barrel, and both feeding and discharging are completed at the same location, simplifying the equipment structure. The pre-mixing device is detachably connected to the inlet on the barrel, and a stirring rod is used to perform preliminary mixing of two or more powders. Materials with large differences in dry density or particle size are pre-mixed before feeding to prevent serious stratification of the materials during the feeding stage.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The superposition of the rotating motion of the cylinder, main shaft and flying knife significantly improves the powder mixing effect and achieves efficient material mixing in a short time;

[0019] 2. The rotating polyhedron cylinder helps eliminate powder arching, improves material fluidity, and reduces the content of unmixed powder;

[0020] 3. The pre-mixing device avoids the stratification of dust at the feed port and improves the mixing effect of powders with large differences in density and pore size. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a mixer according to the present invention;

[0022] Figure 2 This is a schematic diagram of the working state of the mixer of the present utility model;

[0023] Figure 3 This is a schematic diagram of the main shaft and spiral blades of the utility model;

[0024] In the accompanying drawings: 1. Cylinder; 11. Cylinder rotation motor; 2. Spindle rotation assembly; 21. Spindle; 22. Spindle rotation motor; 23. Spiral blade; 231. Front blade; 232. Middle blade; 233. Rear blade; 3. Flying knife rotation assembly; 31. Flying knife rotating shaft; 32. Flying knife; 33. Flying knife rotation motor. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] Example 1

[0028] like Figures 1 to 3 As shown, this embodiment provides a mixer, including a barrel 1, a main shaft rotating assembly 2 and a plurality of flying knife rotating assemblies 3. The main shaft rotating assembly 2 is arranged at the center of the barrel 1, the flying knife rotating assembly 3 is arranged on the inner wall of the barrel 1, and the outer wall of the barrel 1 is provided with an inlet and outlet and a barrel rotating motor 11 for controlling the rotation of the barrel 1. In the production process of powder products, it is often necessary to mix powder materials with large differences in density. Ordinary vibration mixers are usually unable to completely overcome the tendency of separation between materials. Different powders tend to concentrate in a certain position in the mixer due to their different densities. In the process of mixing powders with large differences in particle size, particles of different sizes will produce segregation during the vibration process. Smaller particles may fill the gaps between larger particles, which will also affect the mixing uniformity. When the mixer in this embodiment is in operation, powders of different densities and particle sizes are first poured into the barrel 1 through the inlet and outlet ports. The barrel rotation motor 11, the main shaft rotation assembly 2, and the flying knife rotation assembly 3 are then activated. The rotatable barrel 1, the main shaft rotation assembly 2, and the multiple sets of flying knife rotation assemblies 3 rotate together to eliminate mixing dead spots in the mixer, improve powder mixing uniformity, and achieve a relatively uniform mixing effect even when there is a large difference in powder density and particle size. The barrel rotation motor 11 is fixedly connected to an external load-bearing structure at one end and connected to the barrel 1 at the other end, driving the barrel 1 to rotate about the fixed end. Conventional mixer barrels do not require an external mechanism to fix the barrel, and when the barrel rotates up and down, there is a mixing dead spot at the diagonal position. The barrel rotation motor 11 in this embodiment bears the entire gravity of the barrel 1. Furthermore, the barrel rotation motor 11 and the central axis of the barrel 1 do not coincide, but are at a certain angle. The inclined barrel rotation motor 11 drives the barrel 1 to rotate at an angle as well, eliminating mixing dead spots.

[0029] In order to address the problem that arching is prone to occur during the mixing process of powder products, that is, the arched structure formed by the material in the mixer due to various reasons, resulting in some materials being unable to participate in the mixing, the cylinder 1 in this embodiment is set to a polyhedron structure. The sharp corners of the polyhedron can increase the tumbling and shearing effect of the material in the cylinder 1, which helps to break up the agglomeration of the material and improve the mixing uniformity. This is especially beneficial for the mixing of materials with large density differences. At the same time, the angular structure of the polyhedron cylinder 1 helps to destroy the arching of the material and can improve the fluidity of the material.

[0030] The spindle rotation assembly 2 in this embodiment includes a spindle 21, a spindle rotation motor 22, and spiral blades 23. The spindle rotation motor 22 is mounted on the outer wall of the cylinder 1 and connected to the spindle 21. The spiral blades 23 are arranged in a spiral shape around the spindle 21. Driven by the spindle rotation motor 22, the spiral blades 23 rotate along the spindle 21. Simultaneously, they orbit under the action of the continuously rotating cylinder 1, transporting the material from one end of the mixer to the other and performing a circular motion along the inner wall of the mixer. This causes the material to continuously tumble and shift due to the combined effects of its own gravity, the spiral blades 23, and the cylinder 1, resulting in convective mixing.

[0031] In this embodiment, the section of the spiral blade 23 closest to the main shaft rotating motor 22 is the front blade 231, and the section away from the main shaft rotating motor 22 is the rear blade 233. A middle blade 232 is provided between the front blade 231 and the rear blade 233. The pitch of the front blade 231 is greater than the pitch of the middle blade 232, and the pitch of the front blade 231 is equal to the pitch of the rear blade 233. The diameter of the front blade 231 is greater than the diameter of the middle blade 232, and the diameter of the front blade 231 is equal to the diameter of the rear blade 233. The thickness of the front blade 231 is less than the thickness of the middle blade 232, and the thickness of the front blade 231 is equal to the thickness of the rear blade 233. To ensure the balance of the main shaft 21, the lengths of the front blade 231, the middle blade 232, and the rear blade 233 are all one-third of the length of the main shaft 21. The front blades 231, located near the main shaft motor 22 and the feed inlet and outlet, have a larger pitch to prevent material from accumulating and clogging between the spiral blades 23, thereby facilitating material conveyance. The pitch gradually decreases in the middle section to increase material residence time and mixing. The front blades 231 have a larger diameter, which can be set to a diameter close to the inner diameter of the cylinder 1. This increases the space occupied by the spiral blades 23 within the cylinder, reduces the chance of small particles being squeezed by larger particles, and enables faster material conveyance. The middle blades 232 have a slightly smaller diameter to increase material contact with the cylinder wall, as well as material flow and mixing between the blades. During the mixing process, material tends to concentrate on the middle blades 232. To fully disperse the mixed material, the thickness of the middle blades 232 is set to be greater than that of the front blades 231 and rear blades 233 to enhance mixing and agitation.

[0032] In this embodiment, a plurality of notches are formed at equal intervals on the spiral blade 23. The notches can be arc-shaped or square-shaped. The use of the spiral blade 23 with notches can increase the disturbance of the material and prevent light materials from floating up too quickly or heavy materials from sinking too quickly.

[0033] Example 2

[0034] like Figure 1 、 Figure 2As shown, this embodiment is similar to the first embodiment, except that the knife rotating assembly 3 in this embodiment is symmetrical about the main shaft 21. The knife rotating assembly 3 includes a knife rotating shaft 31, a knife 32, and a knife rotating motor 33 for controlling the rotation of the knife rotating shaft 31. The knife rotating motor 33 is mounted on the outer wall of the cylinder 1 and connected to the knife rotating shaft 31. The knife 32 is mounted on the knife rotating shaft 31, and the central axis of the knife rotating shaft 31 is perpendicular to the central axis of the main shaft 21. The knife rotating motor 33 is independent of the main shaft rotating shaft 22 and the cylinder rotating motor 11. This eliminates the need for the knife 32, the main shaft 21, and the cylinder 1 to maintain the same rotational speed. The knife rotating speed can be greater than the main shaft speed and the cylinder speed. The knife 32 can increase its rotational speed according to mixing needs, enhancing its dispersion and shearing effects, more effectively processing materials near the wall, and reducing dead spots in the mixer. A high-speed rotating fly cutter 32 is set up and is symmetrical about the main shaft 21. The central axis of the fly cutter shaft 31 is perpendicular to the central axis of the main shaft 21. During the rotation process, strong pressure is generated at the fly cutter 32, pressing the powder close to the cylinder wall to the middle main shaft 21 for mixing, that is, the material is gathered from the side to the center. If there are large agglomerates, they will be broken up by the fly cutter 32 to increase the uniformity of powder mixing.

[0035] In this embodiment, multiple sets of flying knives 32 are arranged on the flying knife rotating shaft 31. These flying knives 32 are strip-shaped. The diameters of the multiple sets of flying knives 32 can be set to different diameters. Because the area near the main shaft 21 contacts more material, the diameter of the flying knives 32 can decrease as the distance between the flying knives 32 and the main shaft 21 increases. The strip-shaped structure of the flying knives 32 enhances the shearing effect, significantly improving mixing efficiency and uniformity during the mixing of powders prone to agglomeration.

[0036] Example 3

[0037] This embodiment is similar to the second embodiment, except that the barrel 1 of this embodiment is provided with an inlet and outlet, allowing both feeding and discharging to be accomplished at the same location, simplifying the equipment structure. A detachable pre-mixing device is provided at the inlet and outlet. To prevent severe stratification when powders with significantly different densities are poured into the mixer at the inlet and outlet, a detachable pre-mixing device is provided at the inlet and outlet, and a stirring rod and other structures are used to provide preliminary mixing of two or more powders.

[0038] The barrel 1 in this embodiment is provided with an exhaust filter device. The exhaust filter device includes an exhaust port provided on the mixing barrel 1, which can be connected to an external fan to extract the air in the mixing barrel, control the gas environment in the mixer, and meet the needs of some special powders that need to be mixed under a specific gas environment. A first filter screen can be provided in the direction of the exhaust port toward the inside of the barrel 1. The first filter screen is connected to a push plate provided on the outer wall of the barrel 1 through a compression spring. The user can push the compression spring through the push plate and quickly hit the first filter screen to shake off the powder adhering to its surface to prevent blockage. A second filter screen can also be provided between the first filter screen and the barrel 1, and the external air enters the internal circulation of the mixing barrel through the second filter screen. This not only prevents dust from leaking out, but also allows the raised powder to settle quickly. The provision of the exhaust port can also prevent the accumulation of heat generated during the mixing process and cool the mixer in time.

[0039] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A mixer, characterized in that: The invention comprises a cylinder (1), a main shaft rotating assembly (2) and a plurality of flying knife rotating assemblies (3), wherein the main shaft rotating assembly (2) is arranged at the center of the cylinder (1), the flying knife rotating assembly (3) is arranged on the inner wall of the cylinder (1), and the outer wall of the cylinder (1) is connected to a cylinder rotating motor (11) for controlling the rotation of the cylinder (1).

2. The mixer according to claim 1, characterized in that The main shaft rotating assembly (2) comprises a main shaft (21), a main shaft rotating motor (22) and a spiral blade (23); the main shaft rotating motor (22) is arranged on the outer wall of the cylinder (1) and connected to the main shaft (21); and the spiral blade (23) is arranged in a spiral shape around the main shaft (21).

3. The mixer according to claim 2, characterized in that The section of the spiral blade (23) close to the main shaft rotating motor (22) is a front section blade (231), and the section away from the main shaft rotating motor (22) is a rear section blade (233). A middle section blade (232) is provided between the front section blade (231) and the rear section blade (233). The pitch of the front section blade (231) is greater than the pitch of the middle section blade (232), and the pitch of the front section blade (231) is equal to the pitch of the rear section blade (233).

4. The mixer according to claim 3, characterized in that The diameter of the front blade (231) is greater than the diameter of the middle blade (232), and the diameter of the front blade (231) is equal to the diameter of the rear blade (233).

5. The mixer according to claim 3, characterized in that The thickness of the front blade (231) is greater than the thickness of the middle blade (232), and the thickness of the front blade (231) is equal to the thickness of the rear blade (233).

6. The mixer according to claim 2, characterized in that The spiral blade (23) is provided with a plurality of notches at equal intervals.

7. The mixer according to any one of claims 2 to 6, characterized in that The flying knife rotating assembly (3) is symmetrical about the main shaft (21), and comprises a flying knife rotating shaft (31), a flying knife (32), and a flying knife rotating motor (33) for controlling the rotation of the flying knife rotating shaft (31). The flying knife rotating motor (33) is arranged on the outer wall of the cylinder (1) and connected to the flying knife rotating shaft (31). The flying knife (32) is arranged on the flying knife rotating shaft (31), and the central axis of the flying knife rotating shaft (31) is perpendicular to the central axis of the main shaft (21).

8. The mixer according to claim 7, characterized in that The flying knives (32) are provided in multiple groups on the flying knife rotating shaft (31), and the flying knives (32) are in a strip-shaped structure.

9. The mixer according to any one of claims 1 to 6, characterized in that: The cylinder (1) is a polyhedron structure.

10. The mixer according to any one of claims 1 to 6, characterized in that An inlet and outlet are provided on the outer wall of the cylinder (1), and a detachable pre-mixing device is provided at the inlet and outlet.

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