An ultrasonic disperser for the preparation of alumina fiber composite materials

Abstract

This invention discloses an ultrasonic disperser for the preparation of alumina fiber composite materials, belonging to the field of composite material preparation technology. The device includes a base, a placement platform, a vertical pipe, a fixed frame, a lifting frame, a stirring and vibration mechanism, and a drive motor. A vertical pipe is erected along the edge of the base, and a fixed frame is mounted on the upper end of the pipe. The lifting frame is slidably mounted on the fixed frame and located above the placement platform. The stirring and vibration mechanism is rotatably mounted on the lifting frame and driven by the drive motor. The piezoelectric ceramic of the stirring and vibration mechanism generates ultrasonic vibration after being energized, and the stirring blades at the lower end can stir and mix the powder and water in the container. This device can realize segmented operation of mechanical stirring followed by ultrasonic dispersion, effectively shortening the dispersion time, improving dispersion efficiency and slurry uniformity, avoiding powder agglomeration and deposition, reducing manual intervention, and solving the problems of traditional equipment's single function, poor dispersion effect, and low efficiency, thus providing a high-quality raw material guarantee for the preparation of alumina fiber composite materials.

Description

Technical Field

[0001] This invention belongs to the technical field, specifically relating to an ultrasonic disperser for the preparation of alumina fiber composite materials. Background Technology

[0002] Alumina fiber composites possess excellent properties such as high temperature resistance, high strength, high modulus, and oxidation resistance, and are widely used in metallurgical, chemical, energy, and building materials industries. They are particularly suitable for critical components requiring long-term operation in ultra-high temperature environments above 1600℃, such as high-temperature furnace linings, metallurgical kiln components, and molten metal filter materials. In the preparation of this type of composite material, titanium boride is used... Silicon carbide composite powder, yttrium-doped lanthanum cerate, lanthanum aluminate Uniform dispersion of ultrafine powder raw materials such as mullite multiphase ceramics is the core key to determining the final performance of composite materials.

[0003] Currently, ultrafine powder dispersion generally uses mechanical stirring and ultrasonic dispersion in sequence. It is impossible to achieve integrated and coordinated operation of mechanical stirring and mixing first, followed by ultrasonic fine dispersion and automatic water replenishment in the process. The dispersion efficiency is low, the powder dispersion uniformity is poor, and the slurry stability is insufficient, which easily leads to poor mixing quality after material mixing and makes it difficult to meet the stringent requirements of ultra-high temperature service components.

[0004] Therefore, it is necessary to design an integrated ultrasonic dispersion device to solve the problems of low dispersion efficiency, limited functionality, and excessive manual intervention in existing technologies. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this solution provides an ultrasonic disperser for the preparation of alumina fiber composite materials.

[0006] The technical solution adopted in this invention is as follows: An ultrasonic disperser for the preparation of alumina fiber composite materials includes: A base, on which a placement platform for placing containers is provided; a vertical pipe is vertically connected to the edge of the base, and a fixing frame is installed at the upper end of the vertical pipe; The lifting frame is positioned above the placement platform and slidably connected to the fixed frame; The stirring and vibration mechanism is rotatably mounted on the lifting frame and its rotation is controlled by a drive motor. The upper end of the stirring and vibration mechanism is equipped with a piezoelectric ceramic, which is connected to a high-frequency power supply to generate ultrasonic vibration. The lower end of the stirring and vibration mechanism is equipped with stirring blades, which are used to stir and mix the powder and water in the stirring container.

[0007] Optional: The stirring vibration mechanism includes an upper end cover, a piezoelectric ceramic, a lower end cover, and an amplitude transformer assembly arranged from top to bottom; a clamping bolt passes through the piezoelectric ceramic and the lower end cover and is threadedly connected to the upper end cover; the amplitude transformer assembly is connected to the lower end of the clamping bolt.

[0008] Optionally: The piezoelectric ceramic has one or more, and electrode plates are provided on both sides of the axial direction of each piezoelectric ceramic. The electrode plates are connected to the corresponding electrodes of the power supply. The central hole of the clamping bolt and the through hole on its wall are used for the routing of the wires connected to the electrode plates.

[0009] Optionally, the stirring vibration mechanism further includes a drive assembly, which includes a synchronous belt, a driven pulley, a bearing, and the drive motor; the inner ring of the bearing is axially slidably connected to the clamping bolt, and the outer ring is fixedly connected to the lifting frame; the driven pulley is axially slidably connected to the clamping bolt and is connected to the drive pulley on the output shaft of the drive motor via the synchronous belt.

[0010] Optionally: The amplitude transformer assembly includes a rod body, with one or more blade seats fitted at the lower end of the rod body. A vertical T-shaped groove is provided on the outer wall of the blade seat, and the root of the stirring blade is slidably connected to the T-shaped groove. A first magnet is provided at the end of the T-shaped groove, and a second magnet is installed in the root of the stirring blade. The first magnet and the second magnet repel each other. When the rod body undergoes ultrasonic vibration along the axial direction, the stirring blade can slide relative to the rod body.

[0011] Optionally: A microporous ceramic ring is further provided at the lower end of the rod body; the central hole of the rod body and the micropore of the microporous ceramic ring are connected through a hole on the side wall of the rod body; the upper end of the rod body is connected to a clamping bolt, and the central hole of the rod body is connected to the air pump through the central hole of the clamping bolt.

[0012] Optionally: The upper end of the clamping bolt is connected by a conductive slip ring with a vent hole. The conductive slip ring is installed at the first port of the tee. The second port of the tee is connected to an air pump through an air supply pipe. The third port of the tee is provided with a sealing plug. The wire connected to the conductive slip ring is connected to a high-frequency power supply by passing through the sealing plug.

[0013] Optionally: a conical ring is provided on the upper and lower sides of the microporous ceramic ring, the outer side of the conical ring is flush with the outer side of the microporous ceramic ring and protrudes from the rod body; a spacer bushing is provided between the conical ring and the blade seat; and an end bolt is threaded to the lower end of the rod body.

[0014] Optionally: The fixed frame is provided with a lifting screw, which is controlled to rotate by a lifting motor; the lifting frame is provided with a sliding block, which is threadedly engaged with the lifting screw.

[0015] Optionally: A water supply tank is provided inside the fixed frame, and a water supply head is provided below the lifting frame. The water supply tank is connected to the water supply head through a water pump, and the water supply head is aligned with the container placed on the placement platform.

[0016] The beneficial effects of this invention are as follows: The stirring and vibration mechanism in this solution integrates the dual functions of rotary stirring and ultrasonic vibration, realizing a segmented operation of first mechanical stirring and then ultrasonic dispersion. The rotary stirring and ultrasonic vibration work synergistically and complementarily, significantly shortening the dispersion time and improving the dispersion efficiency. The uniformity of slurry dispersion is significantly enhanced, providing a high-performance raw material guarantee for alumina fiber composite materials. This effectively solves the technical pain points of existing technologies, such as low dispersion efficiency, poor uniformity, single function, excessive manual intervention, and easy agglomeration and deposition of powder. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this scheme or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the ultrasonic disperser in this scheme; Figure 2 This is a diagram of the internal structure of the ultrasonic disperser in this scheme; Figure 3 This is a schematic diagram of the stirring vibration mechanism; Figure 4 This is a structural diagram of the tee joint; Figure 5 yes Figure 4 Structural diagram of section A; Figure 6 yes Figure 4 Structural diagram of section B; Figure 7 yes Figure 4 Structural diagram of segment C.

[0019] In the diagram: 1-Base; 2-Riser; 3-Lifting frame; 4-Fixed frame; 41-Lifting screw; 5-Stirring vibration mechanism; 51-Drive assembly; 511-Drive motor; 512-Synchronous belt; 513-Driven pulley; 514-Bearing; 52-Upper end cover; 53-Piezoelectric ceramic plate; 54-Electrode plate; 55-Lower end cover; 56-Amplitude rod assembly; 561-Rod body; 562-Microporous ceramic ring; 563-Conical ring; 564-Separating bushing; 565-Blade seat; 5651-T-slot; 566-Stirring blade; 5661-Second magnet; 567-End bolt; 57-Clamping bolt; 6-Tee; 61-Sealing plug; 62-Rotating slip ring; 7-Air pump; 71-Air supply pipe; 8-Water supply tank; 81-Water supply head. Detailed Implementation

[0020] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0021] Example like Figures 1 to 7 As shown in the figure, this embodiment designs an ultrasonic disperser for the preparation of alumina fiber composite materials, including a base 1, a lifting frame 3, a stirring and vibration mechanism 5, etc.

[0022] The base 1 is equipped with a placement platform for container placement. A vertical pipe 2 is vertically connected to the edge of the base 1, and a fixing frame 4 is installed at the upper end of the vertical pipe 2. The placement platform has a flat surface and reliable positioning, which can accommodate the rapid placement and precise positioning of containers of different sizes, ensuring the coaxiality of the container center and the stirring and vibrating mechanism 5, and preventing material splashing, uneven mixing, and wear of the mechanism caused by eccentric stirring. The vertically set and rigidly connected vertical pipe 2 provides reliable vertical support for the fixing frame 4, ensuring that the lifting mechanism moves vertically and has high guiding accuracy, avoiding jamming, tilting, or stuck phenomena during lifting, and ensuring that the stirring and vibrating mechanism 5 extends smoothly and is precisely positioned.

[0023] A water replenishment tank 8 is installed inside the fixed frame 4, and a water replenishment head 81 is installed below the lifting frame 3. The water replenishment tank 8 is connected to the water replenishment head 81 via a water pump, and the water replenishment head 81 is aligned with the container placed on the platform. The water replenishment head 81 can add water to the container, achieving multiple water replenishments. Throughout the dispersion process, based on the evaporation of slurry moisture, changes in viscosity, and fluctuations in solid content, precise, controllable, and multiple quantitative water replenishments can be achieved, effectively maintaining the stability of the dispersion medium ratio. The water replenishment head 81 is precisely aligned with the center of the container, and the water flow is gentle and evenly dispersed, avoiding slurry splashing, powder deposition, violent fluctuations in the liquid surface, or re-agglomeration of dispersed particles caused by high-speed water flow impact. It eliminates the need for frequent manual observation and manual water replenishment, significantly reducing the intensity of human intervention, minimizing human error, and improving process consistency and repeatability. It is suitable for long-term, continuous, and automated dispersion operations, and is especially suitable for precision dispersion scenarios of ultrafine, highly active, and easily agglomerated powders.

[0024] The lifting frame 3 is positioned above the placement platform and slidably connected to the fixed frame 4. The fixed frame 4 is equipped with a lifting screw 41, which is controlled by a lifting motor. The lifting frame 3 is equipped with a sliding block, which is threadedly engaged with the lifting screw 41. The self-locking property of the screw ensures that the lifting frame 3 maintains its current height after being raised to the correct position, preventing the stirring and vibration mechanism 5 from falling due to accidental power outages. The sliding engagement between the sliding block and the fixed frame 4 ensures that the stirring and vibration mechanism 5 always maintains a vertical posture and is coaxial with the container, preventing material splashing, uneven mixing, mechanical wear, or decreased ultrasonic vibration efficiency caused by eccentric stirring or uneven load vibration.

[0025] The stirring and vibration mechanism 5 is rotatably mounted on the lifting frame 3 and controlled by the drive motor 511. A piezoelectric ceramic is installed at the upper end of the stirring and vibration mechanism 5, connected to a high-frequency power supply to generate ultrasonic vibration. A stirring blade 566 is installed at the lower end of the stirring and vibration mechanism 5, used to stir and mix the powder and water in the mixing container. The stirring and vibration mechanism 5 integrates the dual core functions of rotary stirring and ultrasonic vibration, achieving segmented and precise operation of mechanical stirring followed by ultrasonic dispersion, matching the process logic of dry powder and water from wetting, mixing, suspension to fine dispersion. The drive motor 511 drives the stirring blade 566 to rotate, providing strong shear force, strong turbulence, and strong convection, quickly breaking up dry powder agglomerates, promoting powder wetting, accelerating solid-liquid mixing, and efficiently preparing a uniform, stable suspension free of dry material clumps, providing high-quality precursor materials for subsequent ultrasonic dispersion. Piezoelectric ceramics generate high-frequency axial ultrasonic vibrations, which are efficiently transmitted to the interior of the slurry via an amplitude transformer, producing a strong ultrasonic cavitation effect. This creates numerous tiny cavitation bubbles, which collapse and release high temperature, high pressure, microjets, and shock waves. This precisely breaks up soft agglomerates of powder, removes impurities adsorbed on the particle surface, and refines the particle distribution, achieving uniform dispersion of the suspension at the microscale. The synergistic effect and complementary advantages of rotary stirring and ultrasonic vibration balance macroscopic mixing efficiency with microscopic dispersion precision and efficiency, providing a high-performance raw material guarantee for alumina fiber composite materials.

[0026] The stirring vibration mechanism 5 includes, from top to bottom, an upper end cover 52, a piezoelectric ceramic, a lower end cover 55, and an amplitude transformer assembly 56. A clamping bolt 57 passes through the piezoelectric ceramic and the lower end cover 55 and is threadedly connected to the upper end cover 52. The amplitude transformer assembly 56 is connected to the lower end of the clamping bolt 57. The upper end cover 52, piezoelectric ceramic, lower end cover 55, and amplitude transformer assembly 56 are axially pre-tightened by the clamping bolt 57. The clamping bolt 57 provides a uniform and controllable axial pre-tightening force, ensuring that the upper and lower end faces of the piezoelectric ceramic are tightly fitted with the electrode plate 54 and the cover plate, without gaps or loosening, thus ensuring a continuous, rigid, and low-loss vibration transmission path. The amplitude transformer assembly 56 is rigidly connected to the lower end of the clamping bolt 57, coaxial with the piezoelectric ceramic, and vibrates synchronously, ensuring consistent ultrasonic vibration direction, stable amplitude, and concentrated output, thus guaranteeing the ultrasonic cavitation effect.

[0027] The piezoelectric ceramic has one or more components, and each piezoelectric ceramic has an electrode plate 54 disposed on both sides of its axial direction. The electrode plate 54 is connected to the corresponding electrode of the power supply. The central hole of the clamping bolt 57 and the through hole on its wall are used for the routing of the wires connected to the electrode plate 54. Stacking multiple piezoelectric ceramics can increase the vibration output power and increase the ultrasonic amplitude. The electrode plate 54 ensures that the electric field uniformly covers the ceramic end face. After being energized, the piezoelectric ceramic generates uniform, stable, and synchronous high-frequency expansion and contraction vibration along the axial direction. The electrode wires are routed internally through the central hole and the through hole on the wall of the clamping bolt 57, resulting in concealed wiring, a neat layout, and no exposed cables.

[0028] The stirring and vibration mechanism 5 also includes a drive assembly 51, which comprises a synchronous belt 512, a driven pulley 513, a bearing 514, and a drive motor 511. The inner ring of the bearing 514 is axially slidably connected to the clamping bolt 57, and the outer ring is fixedly connected to the lifting frame 3. The driven pulley 513 is axially slidably connected to the clamping bolt 57 and is connected to the drive pulley on the output shaft of the drive motor 511 via the synchronous belt 512. The driving method of the drive assembly 51 ensures that the rotary stirring motion and the axial ultrasonic vibration motion are independent, do not interfere with each other, and do not affect each other. The drive motor 511 drives the clamping bolt 57, the amplitude transformer assembly 56, and the stirring blades 566 to rotate at a uniform speed, resulting in stable stirring speed, uniform shear force, and consistent mixing effect, avoiding uneven mixing, powder deposition, or slurry splashing caused by speed fluctuations. The bearing 514 adopts an axial sliding fit design, which facilitates the bearing to withstand rotational torque and vibration load, ensuring stable, quiet, and reliable operation of the entire machine, further enhancing the ultrasonic cavitation effect and improving the dispersion quality.

[0029] The amplitude transformer assembly 56 includes a rod body 561, with one or more blade seats 565 sleeved at the lower end of the rod body 561. A vertical T-shaped groove 5651 is provided on the outer wall of the blade seat 565. The root of the stirring blade 566 is slidably connected to the T-shaped groove 5651. A first magnet is provided at the end of the T-shaped groove 5651, and a second magnet 5661 is installed inside the root of the stirring blade 566. The first magnet and the second magnet 5661 repel each other. When the rod body 561 undergoes ultrasonic vibration along the axial direction, the stirring blade 566 can slide relative to the rod body 561. Through the sliding engagement between the T-shaped groove and the stirring blade 566, the stirring blade 566 can maintain its position when the rod body 561 vibrates, avoiding fatigue damage to the stirring blade 566, facilitating the dispersal of local agglomerates, preventing particle sedimentation, and improving the overall uniformity of the slurry. The first magnet and the second magnet 5661, with their like poles repelling each other, ensure that the stirring blade 566 is positioned appropriately and moves flexibly. This further ensures that stirring and vibration do not interfere with each other, improves the uniformity, stability and dispersion quality of the slurry, and provides a high-quality raw material guarantee for alumina fiber composite materials.

[0030] A microporous ceramic ring 562 is also provided at the lower end of the rod 561. The central hole of the rod 561 and the micropores of the microporous ceramic ring 562 are connected through holes on the side wall of the rod 561. The upper end of the rod 561 is connected to the clamping bolt 57, and the central hole of the rod 561 is connected to the air pump 7 through the central hole of the clamping bolt 57. Through the microporous ceramic ring 562, a large number of micron-sized microbubbles are continuously, stably, and uniformly released during ultrasonic dispersion, which meets the requirements of ultrasonic cavitation enhancement and significantly increases the number of cavitation nuclei. The microporous ceramic ring 562 has a connected microporous structure with high porosity, which facilitates the formation of microbubbles as cavitation nuclei. It can efficiently excite the cavitation effect in the ultrasonic field. The cavitation bubbles are numerous, widely distributed, and have concentrated collapse energy, which accurately breaks up the soft agglomerates of ultrafine powders and improves the dispersion quality. During the rise of microbubbles, the slurry is driven to form strong longitudinal convection, which effectively eliminates the bottom, corners and other dead zones of the mixing, prevents powder deposition, stratification or secondary agglomeration, and greatly shortens the dispersion time, reduces energy consumption and improves the quality of the slurry.

[0031] The upper end of the clamping bolt 57 is connected via a conductive slip ring with a vent hole. The conductive slip ring is installed at the first port of the tee 6. The second port of the tee 6 is connected to the air pump 7 via an air supply pipe 71. The third port of the tee 6 is equipped with a sealing plug 61. The wire connected to the conductive slip ring passes through the sealing plug 61 and is connected to a high-frequency power supply. The upper end cover 52 of the tee 6 or the stirring vibration mechanism 5 is fixed to the lifting frame 3 by a corresponding bracket. By utilizing the vent hole at the center of the conductive slip ring, the conductive slip ring has both conductive and ventilating functions, which facilitates the power supply of the electrode plate 54 and enables a stable air supply to the microporous ceramic ring 562. The structure of the tee 6 achieves reasonable separation and sealing isolation of the air and electrical circuits, ensuring air circuit sealing, electrical circuit insulation, gas-electric separation, and no interference between them.

[0032] The microporous ceramic ring 562 is provided with conical rings 563 on its upper and lower sides respectively. The outer side of the conical ring 563 is flush with the outer side of the microporous ceramic ring 562 and protrudes from the rod body 561. A spacer bushing 564 is provided between the conical ring 563 and the blade seat 565. The lower end of the rod body 561 is threaded with an end bolt 567.

[0033] The procedure for using an ultrasonic disperser is as follows: 1. Prepare the dry powder raw materials required for alumina fiber composite materials (such as titanium boride). Silicon carbide composite powder and deionized water are added to a container, which is placed on the base 1. The lifting motor drives the lifting screw 41 to rotate, so that the lifting frame 3 moves downward along the fixed frame 4, and the stirring vibration mechanism 5 extends into the material in the container.

[0034] 2. Start the drive motor 511. The drive motor 511 drives the driven pulley 513 to rotate through the synchronous belt 512, which in turn drives the clamping bolt 57 and the amplitude rod assembly 56 to rotate as a whole. The stirring blade 566 rotates at high speed with the rod body 561, first fully mixing the dry powder with water. During the stirring process, when the water pump is started, water can be continuously added to the container through the water replenishment head 81 to achieve multiple water additions and stirring, finally forming a uniform suspension, completing the wetting and initial mixing of the dry powder.

[0035] 3. After the suspension is formed, the high-frequency power supply is turned on. The current is sent to the electrode plates 54 on both sides of the piezoelectric ceramic through the conductive slip ring and the wires in the clamping bolt 57, causing the piezoelectric ceramic to reciprocate and expand, thereby generating axial high-frequency ultrasonic vibration. The vibration is transmitted to the amplitude transformer assembly 56 through the clamping bolt 57, which drives the rod body 561 to perform axial ultrasonic vibration synchronously, generating a strong ultrasonic cavitation effect inside the suspension, breaking up powder agglomerates, and realizing the fine dispersion of the suspension.

[0036] During the axial vibration of the rod 561, the stirring blades 566 do not vibrate up and down under the action of inertia, but slide axially relative to each other along the T-shaped groove of the blade seat 565, thus avoiding fatigue damage to the stirring blades 566. In addition, the air pump 7 is started according to the installation program. The gas passes through the air supply pipe 71, the tee 6, the conductive slip ring, the center hole of the clamping bolt 57, and the center hole of the rod 561 in sequence, and finally overflows evenly from the microporous ceramic ring 562 at the lower end of the rod 561, forming a large number of microbubbles. The microbubbles act as cavitation nuclei to enhance the ultrasonic cavitation effect. At the same time, the rising of the bubbles drives the longitudinal convection of the suspension, further improving the dispersion uniformity and stability.

[0037] During the above dispersion process, the liquid in the water replenishment tank 8 can be replenished to the container through the water pump and the water replenishment head 81, so as to control the deionized water content in the container in stages.

[0038] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation; it is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this technology.

Claims

1. An ultrasonic disperser for preparing alumina fiber composite materials, characterized in that: include: A base (1) is provided with a placement platform for placing containers; A vertical pipe (2) is vertically connected to the edge of the base (1), and a fixing frame (4) is installed at the upper end of the vertical pipe (2). The lifting frame (3) is set above the placement platform and is slidably connected to the fixed frame (4); The stirring and vibration mechanism (5) is rotatably mounted on the lifting frame (3) and controlled to rotate by the drive motor (511). The upper end of the stirring and vibration mechanism (5) is provided with a piezoelectric ceramic, which is connected to a high-frequency power supply to generate ultrasonic vibration. The lower end of the stirring and vibration mechanism (5) is provided with a stirring blade (566), which is used to stir and mix the powder and water in the stirring container.

2. The ultrasonic disperser for preparing alumina fiber composite materials according to claim 1, characterized in that: The stirring vibration mechanism (5) includes an upper end cover (52), a piezoelectric ceramic, a lower end cover (55), and an amplitude rod assembly (56) arranged from top to bottom; a clamping bolt (57) passes through the piezoelectric ceramic and the lower end cover (55) and is threadedly connected to the upper end cover (52); the amplitude rod assembly (56) is connected to the lower end of the clamping bolt (57).

3. The ultrasonic disperser for preparing alumina fiber composite materials according to claim 2, characterized in that: The piezoelectric ceramic has one or more, and each piezoelectric ceramic has an electrode plate (54) on both sides of its axial direction. The electrode plate (54) is connected to the corresponding electrode of the power supply. The central hole of the clamping bolt (57) and the through hole on its hole wall are used for the wiring of the conductor connected to the electrode plate (54).

4. The ultrasonic disperser for preparing alumina fiber composite materials according to claim 2, characterized in that: The stirring vibration mechanism (5) further includes a drive assembly (51), which includes a synchronous belt (512), a driven pulley (513), a bearing (514), and the drive motor (511). The inner ring of the bearing (514) is axially slidably connected to the clamping bolt (57), and the outer ring is fixedly connected to the lifting frame (3). The driven pulley (513) is axially slidably connected to the clamping bolt (57) and is connected to the drive pulley on the output shaft of the drive motor (511) through the synchronous belt (512).

5. The ultrasonic disperser for preparing alumina fiber composite materials according to claim 2, characterized in that: The amplitude transformer assembly (56) includes a rod body (561), and one or more blade seats (565) are sleeved on the lower end of the rod body (561). A vertical T-shaped groove (5651) is provided on the outer side wall of the blade seat (565). The root of the stirring blade (566) is slidably connected to the T-shaped groove (5651). A first magnet is provided at the end of the T-shaped groove (5651), and a second magnet (5661) is installed in the root of the stirring blade (566). The first magnet and the second magnet (5661) repel each other. When the rod body (561) undergoes ultrasonic vibration along the axial direction, the stirring blade (566) can slide relative to the rod body (561).

6. The ultrasonic disperser for preparing alumina fiber composite materials according to claim 5, characterized in that: A microporous ceramic ring (562) is also provided at the lower end of the rod (561). The microporous ceramic ring (562) is connected to the central hole of the rod (561) and the micropore of the microporous ceramic ring (562) through a hole on the side wall of the rod (561). The upper end of the rod (561) is connected to a clamping bolt (57), and the central hole of the rod (561) is connected to the air pump (7) through the central hole of the clamping bolt (57).

7. The ultrasonic disperser for preparing alumina fiber composite materials according to claim 6, characterized in that: The upper end of the clamping bolt (57) is connected by a conductive slip ring with a vent hole. The conductive slip ring is installed at the first port of the tee (6). The second port of the tee (6) is connected to the air pump (7) through the air supply pipe (71). The third port of the tee (6) is provided with a sealing plug (61). The wire connected to the conductive slip ring is connected to the high-frequency power supply by passing through the sealing plug (61).

8. The ultrasonic disperser for preparing alumina fiber composite materials according to claim 6, characterized in that: The microporous ceramic ring (562) is provided with conical rings (563) on its upper and lower sides respectively. The outer side of the conical ring (563) is flush with the outer side of the microporous ceramic ring (562) and protrudes from the rod body (561). A spacer bushing (564) is provided between the conical ring (563) and the blade seat (565). The lower end of the rod body (561) is threaded with an end bolt (567).

9. The ultrasonic disperser for preparing alumina fiber composite materials according to any one of claims 1-8, characterized in that: The fixed frame (4) is provided with a lifting screw (41), which is controlled to rotate by a lifting motor; the lifting frame (3) is provided with a sliding block, which is threadedly engaged with the lifting screw (41).

10. The ultrasonic disperser for preparing alumina fiber composite materials according to any one of claims 1-8, characterized in that: The fixed frame (4) is equipped with a water supply tank (8), and the lifting frame (3) is equipped with a water supply head (81) below it. The water supply tank (8) is connected to the water supply head (81) through a water pump, and the water supply head (81) is aligned with the container placed on the platform.

Images