Alumina powder stirring device

Abstract

This utility model relates to the technical field of alumina powder processing equipment, specifically to an alumina powder mixing device, including a mixing tank. The mixing tank has a feed inlet at the top and a discharge outlet and discharge valve at the bottom. The top of the mixing tank is equipped with a double-shaft nested mixing shaft, which includes an inner shaft and an outer shaft coaxially arranged. The outer shaft is sleeved outside the inner shaft, and a bearing is installed between the inner and outer shafts. Several inner stirring blades are mounted on the outer circumferential surface of the inner shaft, arranged axially. Several outer stirring blades are mounted on the outer circumferential surface of the outer shaft, arranged circumferentially. The outer stirring blades are rod-shaped and located around the inner stirring blades. The double-shaft nested mixing shaft allows the inner and outer stirring blades to rotate independently, with adjustable speed and direction, enhancing the mixing effect on the alumina powder and improving the uniformity and efficiency of the mixing.

Description

Technical Field

[0001] This utility model relates to the technical field of alumina powder processing equipment, specifically to an alumina powder stirring device. Background Technology

[0002] Alumina powder, commonly known as bauxite, is an important industrial raw material. It is widely used in metallurgy, ceramics, chemical, and electronics industries, and is a key basic material for the production of aluminum metal, refractory materials, catalyst carriers, and other products.

[0003] From a microscopic perspective, alumina powder possesses a certain specific surface area and surface energy. This characteristic causes particles to gradually approach and aggregate during storage and discharging due to interactions such as van der Waals forces and electrostatic forces, leading to agglomeration. These agglomerates not only alter the original particle size distribution of the alumina powder but may also reduce its flowability, causing numerous inconveniences for subsequent processing and use. Simultaneously, due to electrostatic effects, alumina powder tends to adhere firmly to the walls and bottom of storage containers, almost as if it were adsorbed. Over time, this not only results in material waste but may also form a stubborn agglomerated layer inside the container, affecting its normal use and even contaminating subsequent batches of alumina powder. Therefore, the stirring device plays a crucial role in the production and processing of alumina powder.

[0004] However, current alumina powder mixing devices on the market have many shortcomings. Most existing mixing devices adopt a single-shaft, single-speed mixing mode. This single mixing method means that the mixing blades can only mix the powder at a fixed speed and with a single trajectory during rotation. Faced with complex alumina powder systems, this mixing mode cannot generate a sufficiently rich flow field, making it difficult to fully agitate the powder from all directions and angles, resulting in uneven mixing within the powder. Some areas of powder may be over-mixed, while others may be under-mixed, making it difficult to achieve the ideal state of thorough and uniform mixing of alumina powder. Over time, the stability and consistency of product quality will inevitably be severely affected, making it difficult to meet the increasingly stringent quality requirements of high-end manufacturing industries for alumina powder. Utility Model Content

[0005] To address the technical problem of uneven mixing in existing mixing devices, this utility model provides an alumina powder mixing device.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An alumina powder mixing device includes a mixing tank with an inlet at the top and an outlet and discharge valve at the bottom. A double-nested mixing shaft is installed at the top of the mixing tank, inserted into the tank from the top. The double-nested mixing shaft includes an inner shaft and an outer shaft arranged coaxially, with the outer shaft sleeved around the inner shaft. A bearing is installed between the inner and outer shafts. Several inner stirring blades are mounted on the outer circumference of the inner shaft, arranged axially. Several outer stirring blades are mounted on the outer circumference of the outer shaft, arranged circumferentially. The outer stirring blades are rod-shaped and located around the inner stirring blades. The double-nested mixing shaft allows the inner and outer stirring blades to rotate independently, with adjustable speed and direction, enhancing the mixing effect on the alumina powder and improving the uniformity and efficiency of the mixing.

[0007] In a preferred embodiment of an alumina powder mixing device, a sealing assembly is provided between the inner and outer shafts. The sealing assembly is mounted on a retaining ring that protrudes inward at the bottom end of the outer shaft, and the inner diameter of the retaining ring is smaller than the outer diameter of the inner shaft. This prevents alumina powder from entering the gap between the inner and outer shafts.

[0008] In a preferred embodiment of an alumina powder mixing device, the top of the inner shaft extends through the outer shaft. An inner shaft pulley is mounted on the outer circumference of the top of the inner shaft. This inner shaft pulley is connected to a pulley on the output shaft of a first drive motor via a belt. The first drive motor is mounted on the top of the mixing tank. When the first drive motor starts, its power is transmitted to the inner shaft pulley via the belt, thereby driving the inner shaft to rotate. By adjusting the speed of the first drive motor, the rotation speed of the inner shaft can be precisely controlled.

[0009] In a preferred embodiment of an alumina powder mixing device, an outer shaft gear is mounted on the outer circumferential surface of the top end of the outer shaft. This outer shaft gear meshes with a drive gear on the output shaft of a second drive motor, which is mounted on the top of the mixing tank. When the second drive motor starts, the drive gear drives the outer shaft gear to rotate, thereby driving the outer shaft to rotate. Because the outer shaft gear and the drive gear have different numbers of teeth, by appropriately selecting the gear ratio, the outer shaft and the inner shaft can rotate at different speeds.

[0010] In a preferred embodiment of an alumina powder mixing device, both the inner and outer mixing blades are coated with a polyurethane rubber layer. The polyurethane rubber layer possesses good elasticity and wear resistance, reducing friction between the inner and outer mixing blades and the alumina powder during mixing, preventing metallic impurities from the inner and outer mixing blades themselves from mixing into the powder, and also adsorbing a small amount of impurities to a certain extent.

[0011] As a preferred implementation of an alumina powder stirring device, the inner wall of the stirring tank is provided with multiple irregularly distributed protruding turbulence blocks.

[0012] In a preferred embodiment of an alumina powder mixing device, the bottom of the mixing tank is supported on a support frame. The support frame provides stable support for the mixing tank, ensuring the smooth operation of the entire mixing device.

[0013] The beneficial effects of this utility model include: 1. This device employs a unique dual-shaft nested stirring shaft design. The inner and outer stirring blades on the dual-shaft nested stirring shafts can be driven independently, rotating at different speeds and directions according to actual stirring requirements. When the inner and outer stirring blades operate in their own unique ways, it's as if a complex and efficient stirring network is constructed within the stirring tank. The device also incorporates turbulence-inducing blocks on the inner wall of the stirring tank. These blocks are irregularly distributed on the tank wall; when alumina powder encounters these turbulence-inducing blocks during stirring, its flow direction and velocity change, forming complex turbulence.

[0014] 2. By coating the surfaces of the inner and outer agitators with a polyurethane rubber layer, the mixing of metallic impurities from the agitator into the alumina powder is effectively prevented during the mixing process. At the same time, it can also adsorb a small amount of impurities, greatly improving the purity of the alumina powder.

[0015] 3. The bearings and sealing components between the inner and outer shafts ensure that they can rotate coaxially without interference, improving the stability and reliability of the equipment. Meanwhile, the pressure relief valve and flow regulating valve effectively control the pressure inside the mixing tank, ensuring safe and stable operation during the mixing process. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional structural diagram of an alumina powder stirring device according to a specific embodiment of the present utility model; Figure 2 for Figure 1 An enlarged schematic diagram of the structure at point A in the middle.

[0018] List of components and reference numerals: 1-Mixing tank; 2-Inner shaft; 3-Outer shaft; 4-Inner agitator; 5-Outer agitator; 6-First drive motor; 7-Second drive motor; 8-Support frame; 9-Inlet; 10-Outlet; 11-Outlet valve; 12-Motor bracket; 13-Baffle ring; 17-Bumper block; 20-Bearing; 21-Sealing assembly; 22-Inner shaft pulley; 23-Outer shaft gear; 24-Drive gear. Detailed Implementation

[0019] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Please see Figure 1-2 This utility model provides a technical solution: an alumina powder stirring device, including a stirring tank 1, a double-shaft nested stirring shaft, a stirring paddle, a driving device, a gas turbulence system and a support frame 8.

[0021] The mixing tank 1 is installed on the support frame 8. The top of the mixing tank 1 is provided with a feed port 9 for adding alumina powder into the mixing tank 1. The bottom is provided with a discharge port 10, and a discharge valve 11 is provided at the discharge port 10 for controlling the discharge.

[0022] A nested dual-shaft agitator is inserted into the mixing tank 1 from the top. The nested dual-shaft agitator includes an inner shaft 2 and an outer shaft 3 arranged vertically and coaxially. The outer shaft 3 is fitted over the inner shaft 2. Multiple bearings 20 are evenly distributed axially between the inner shaft 2 and the outer shaft 3. These bearings 20 have their inner rings tightly fitted onto the inner shaft 2, while their outer rings are tightly fitted against the inner wall of the outer shaft 3. The bearings 20 are deep groove ball bearings, which have good radial load capacity and a low coefficient of friction, ensuring smooth rotation of the inner shaft 2 and outer shaft 3 during relative rotation, while effectively reducing friction between them and lowering energy loss. To prevent alumina powder from entering the gap between the inner and outer shafts and affecting the normal operation of the bearings, a sealing assembly 21 is provided between the inner shaft 2 and the outer shaft 3. The sealing assembly 21 is installed on the retaining ring 13 that protrudes inward at the bottom end of the outer shaft 3. The inner diameter of the retaining ring 13 is smaller than the outer diameter of the inner shaft 2. The sealing assembly 21 is a sealing structure that combines a labyrinth seal and a rubber sealing ring. The labyrinth seal effectively blocks the entry of powder through its complex channel structure; the rubber sealing ring further enhances the sealing effect, ensuring the airtightness of the mixing environment and the reliability of the equipment.

[0023] The drive unit includes a first drive motor 6 and a second drive motor 7, both mounted on their respective motor brackets 12, which are located on the top of the mixing tank 1. The inner shaft pulley 22 at the top of the inner shaft 2 is connected to the pulley on the output shaft of the first drive motor 6 via a belt; the outer shaft gear 23 on the outer side of the top of the outer shaft 3 meshes with the drive gear 24 on the output shaft of the second drive motor 7. When the first drive motor 6 starts, its power is transmitted to the inner shaft pulley 22 via the belt, thus driving the inner shaft 2 to rotate. By adjusting the speed of the first drive motor 6, the rotation speed of the inner shaft 2 can be precisely controlled. When the second drive motor 7 starts, the drive gear 24 drives the outer shaft gear 23 to rotate, thereby driving the outer shaft 3 to rotate. Because the outer shaft gear 23 and the drive gear 24 have different numbers of teeth, by appropriately selecting the gear ratio, the outer shaft 3 and the inner shaft 2 can rotate at different speeds. Simultaneously, by controlling the forward and reverse rotation of the two drive motors, the inner shaft 2 and the outer shaft 3 can rotate in the same or opposite directions.

[0024] The agitator comprises several inner agitator blades 4 mounted on an inner shaft 2 and several outer agitator blades 5 mounted on an outer shaft 3. The inner agitator blades 4 are arranged axially along the inner shaft 2, and the outer agitator blades 5 are arranged circumferentially along the outer shaft 3. The outer agitator blades 5 are rod-shaped structures composed of multiple connected support rods, and are located around the inner agitator blades 4 to avoid mutual interference. Both the inner agitator blades 4 and the outer agitator blades 5 are coated with a polyurethane rubber layer. The polyurethane rubber layer has good elasticity and wear resistance, which can reduce the friction between the inner agitator blades 4 and 5 and the alumina powder during the agitation process, prevent metallic impurities from the inner agitator blades 4 and 5 themselves from mixing into the powder, and also adsorb a small amount of impurities to a certain extent.

[0025] The inner wall of the mixing tank 1 is provided with multiple raised baffles 17.

[0026] Working Principle: In operation, first open the feed inlet 9 and add alumina powder into the mixing tank 1. Then, start the first drive motor 6 and the second drive motor 7. The first drive motor 6 drives the inner shaft 2 to rotate via a belt, and the second drive motor 7 drives the outer shaft 3 to rotate via gear transmission. The inner shaft 2 and the outer shaft 3 can rotate at different speeds and directions, thereby driving the inner stirring paddle 4 and the outer stirring paddle 5 to stir the alumina powder. The turbulence blocks 17 on the inner wall of the mixing tank 1 can further change the flow direction and speed of the powder, and also enhance the turbulence effect of the stirring, enabling the alumina powder to be stirred more thoroughly. After stirring is complete, open the discharge valve 11 to discharge the stirred alumina powder from the discharge port 10.

[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An alumina powder mixing device, comprising a mixing tank (1), characterized in that, The mixing tank (1) is provided with a feed inlet (9) at the top and a discharge outlet (10) and a discharge valve (11) at the bottom. The top of the mixing tank (1) is provided with a double-shaft nested mixing shaft. The double-shaft nested mixing shaft is inserted into the mixing tank (1) from the top of the mixing tank (1). The double-shaft nested mixing shaft includes an inner shaft (2) and an outer shaft (3) arranged coaxially. The outer shaft (3) is sleeved on the outside of the inner shaft (2). A bearing (20) is installed between the inner shaft (2) and the outer shaft (3). Several inner stirring blades (4) are installed on the outer circumferential surface of the inner shaft (2). The several inner stirring blades (4) are arranged along the axial direction. Several outer stirring blades (5) are installed on the outer circumferential surface of the outer shaft (3). The several outer stirring blades (5) are arranged along the circumferential direction of the outer shaft (3). The outer stirring blades (5) are rod-shaped structures and are located outside the inner stirring blades (4).

2. The apparatus according to claim 1, wherein A sealing assembly (21) is provided between the inner shaft (2) and the outer shaft (3). The sealing assembly (21) is installed on the retaining ring (13) that protrudes inward from the bottom end of the outer shaft (3). The inner diameter of the retaining ring (13) is smaller than the outer diameter of the inner shaft (2).

3. The apparatus according to claim 1, wherein The top of the inner shaft (2) extends through the outer shaft (3). An inner shaft pulley (22) is installed on the outer circumference of the top of the inner shaft (2). The inner shaft pulley (22) is connected to the pulley on the output shaft of the first drive motor (6) via a belt. The first drive motor (6) is installed on the top of the mixing tank (1).

4. The apparatus according to claim 1, wherein An outer shaft gear (23) is installed on the outer circumferential surface of the top end of the outer shaft (3). The outer shaft gear (23) meshes with the drive gear (24) on the output shaft of the second drive motor (7). The second drive motor (7) is installed on the top of the mixing tank (1).

5. The apparatus for stirring alumina powder according to claim 1, wherein The surfaces of both the inner stirring paddle (4) and the outer stirring paddle (5) are covered with a layer of polyurethane rubber.

6. The apparatus for stirring alumina powder according to claim 1, wherein The inner wall of the mixing tank (1) is provided with a number of irregularly distributed protruding turbulence blocks (17).

7. The apparatus according to claim 1, wherein The bottom of the mixing tank (1) is supported on the support frame (8).

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