An ultrasonic agitation mixing device

Abstract

The utility model relates to an ultrasonic stirring mixing device belongs to material mixing equipment technical field, solved the problem of particle agglomeration, cavity wall dead zone, powder splashing and the problem of insufficient mixing uniformity existing in the prior art when material mixes. The device includes mixing cavity, stirring drive motor, the output shaft of motor stretches into mixing cavity, and the upper, middle, lower stirring paddle are fixed and arranged in proper order on the output shaft along the axial direction, the inside of the lateral wall of mixing cavity is provided with cavity ultrasonic generator, the inside of middle stirring paddle is integrated with paddle ultrasonic generator, the inner wall of mixing cavity is rotatably connected with the fairwater through the pivot, the fairwater is connected with the angle adjusting motor that drives its rotation, the mixing cavity still is provided with viscosity sensor. Realized the cooperation of ultrasonic resonance, mechanical stirring and dynamic flow guide, can automatically optimize mixing parameter according to the viscosity change, realized efficient, uniform, no dead zone mixing.

Description

Technical Field

[0001] This utility model relates to the field of material mixing equipment technology, and in particular to an ultrasonic stirring and mixing device. Background Technology

[0002] In industrial fields such as energy materials, electronic pastes, and ceramic coatings, the uniform mixing of high-viscosity, multi-component pastes is a crucial process for ensuring the performance of the final product. These pastes typically contain a high proportion of solid particles, and their mixing uniformity directly determines the consistency and core performance indicators of the finished product.

[0003] Currently, the industry mostly uses mixing equipment that integrates auxiliary functions into traditional mechanical stirring, but this has obvious limitations. For example, external ultrasonic equipment has low energy transfer efficiency and is ineffective at breaking up agglomerates in the core area of ​​the slurry; fixed flow guiding structures cannot adapt to dynamic changes in material viscosity, easily forming mixing dead zones; at the same time, temperature control management during the mixing process is rudimentary, posing a risk of localized overheating. These shortcomings make it difficult for existing equipment to meet the high requirements for mixing uniformity and precise process control. Utility Model Content

[0004] Based on the above analysis, the present invention aims to provide an ultrasonic stirring and mixing device to solve at least one of the problems existing in the prior art during material mixing, such as particle agglomeration, dead zones in the cavity walls, powder splashing, and insufficient mixing uniformity.

[0005] This invention discloses an ultrasonic stirring and mixing device, comprising a mixing chamber, a top cover, and a stirring drive motor mounted on the top cover. The output shaft of the stirring drive motor extends into the mixing chamber. An upper stirring blade, a middle stirring blade, and a lower stirring blade are fixedly mounted on the output shaft from top to bottom along the axial direction. An ultrasonic generator is disposed inside the side wall of the mixing chamber. An ultrasonic generator is integrated inside the middle stirring blade. A guide plate is rotatably connected to the inner wall of the mixing chamber via a rotating shaft. The guide plate is connected to an angle adjustment motor that drives its rotation. A material viscosity sensor is also disposed on the mixing chamber.

[0006] Furthermore, the upper, middle, and lower stirring blades are respectively connected to the output shaft of the stirring drive motor via independent upper, middle, and lower electromagnetic clutches.

[0007] Furthermore, the electromagnetic clutch is a bidirectional clutch, capable of driving the stirring blades to rotate in both directions.

[0008] Furthermore, the front side of the guide plate is provided with drag-reducing microgrooves.

[0009] Furthermore, the drag-reducing microgroove is a V-shaped groove, and the extension direction of the V-shaped groove is consistent with the expected flow direction of the material on the surface of the guide plate.

[0010] Furthermore, the back of the guide plate is provided with turbulence-inducing ribs.

[0011] Furthermore, the surfaces of the upper, middle, and lower stirring blades are provided with micro-nano structures, which are micron-sized protrusions and nano-sized grooves formed between the protrusions.

[0012] Furthermore, the tip of the lower stirring blade is provided with a flexible scraper, which contacts the inner wall of the mixing chamber.

[0013] Furthermore, the ultrasonic stirring and mixing device also includes a controller, and the viscosity sensor, the angle adjustment motor, the upper electromagnetic clutch, the middle electromagnetic clutch, the lower electromagnetic clutch, the cavity ultrasonic generator, and the blade ultrasonic generator are all communicatively connected to the controller.

[0014] Furthermore, a discharge port is provided at the bottom of the mixing chamber.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0016] 1) The ultrasonic stirring and mixing device of this utility model includes three sections of stirring blades (upper, middle and lower), as well as a material viscosity sensor and controller. The upper stirring blade can perform a left-handed tumbling motion, the middle stirring blade can perform a bidirectional alternating stirring motion, and the lower stirring blade can perform a high-speed shearing motion. It can realize multiple motion modes to meet the stirring requirements under different viscosities and simultaneously solve multiple problems such as powder splashing, bottom deposition and cavity wall dead zone.

[0017] 2) The ultrasonic stirring and mixing device of this utility model includes an ultrasonic generator integrated inside the stirring blade and a cavity ultrasonic generator set on the side wall of the mixing cavity. The two resonate, so that ultrasonic energy can be emitted from the center and side wall of the cavity at the same time and reinforce each other, thereby improving the utilization rate of ultrasonic energy and realizing efficient and low-energy-consumption crushing of micron-sized and even submicron-sized agglomerates.

[0018] 3) The ultrasonic mixing device of this invention includes a micro-nano structure on the surface of the stirring blade, drag-reducing microgrooves on the front of the guide plate, and flow-deflecting ribs on the back. The micro-nano structure on the surface of the stirring blade consists of micron-sized protrusions and nano-sized grooves formed between the protrusions. By mimicking the water-repellent properties of lotus leaves in nature, it makes it difficult for slurry to adhere to the blade. The drag-reducing microgrooves on the front of the guide plate are V-shaped grooves, and the groove extension direction is consistent with the expected flow direction of the material on the surface of the guide plate. The flow-deflecting ribs on the back can mimic the principle of shark skin reducing resistance, reducing slurry flow resistance, effectively scraping away gap residue, thereby reducing the residue of highly viscous materials in the equipment.

[0019] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0020] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0021] Figure 1 This is a three-dimensional structural diagram of the ultrasonic stirring and mixing device of this utility model;

[0022] Figure 2 for Figure 1 Top view of the ultrasonic stirring and mixing device shown;

[0023] Figure 3 for Figure 1 A bottom view of the ultrasonic stirring and mixing device shown.

[0024] Figure 4 for Figure 1 Cross-sectional view of the ultrasonic stirring and mixing device shown;

[0025] Figure 5 This is a schematic diagram showing the installation position of the guide plate of this utility model on the inner wall of the mixing chamber;

[0026] Figure 6 This is a schematic diagram of the front (left), back (middle), and side (right) structure of the guide plate of this utility model;

[0027] Figure 7 This is a schematic diagram of the micro / nano structure on the surface of the stirring blade of this utility model;

[0028] Figure 8This is a schematic diagram showing the location of the ultrasonic generator integrated into the stirring blade in this utility model.

[0029] Figure label:

[0030] 1-Stirring drive motor; 2-Top cover; 31-Upper stirring blade; 32-Middle stirring blade; 33-Lower stirring blade; 4-Cavity ultrasonic generator; 5-Blade ultrasonic generator; 61-Upper clutch; 62-Middle clutch; 63-Lower clutch; 7-Viscosity sensor; 8-Guide plate; 91-Drag reduction microgroove; 92-Break rib; 12-Discharge port; 13-Angle adjustment motor; 14-Feed cover; 15-Micron-level protrusion; 16-Nanometer-level groove. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0032] This utility model proposes an ultrasonic stirring and mixing device, such as Figure 1-8 As shown, the system includes a mixing chamber, a top cover 2, and a stirring drive motor 1 mounted on the top cover 2. The output shaft of the stirring drive motor 1 extends into the mixing chamber, and an upper stirring blade 31, a middle stirring blade 32, and a lower stirring blade 33 are sequentially fixed along the axial direction on the output shaft. A chamber ultrasonic generator 4 is installed inside the side wall of the mixing chamber. A blade ultrasonic generator 5 (e.g., ...) is integrated inside the middle stirring blade 32. Figure 8 As shown in the figure (the micro-nano structure of the blade surface is not shown for clarity); a guide plate 8 is rotatably connected to the inner wall of the mixing chamber via a rotating shaft, and the guide plate 8 is connected to an angle adjustment motor 13 that drives its rotation; a material viscosity sensor 7 is also provided on the mixing chamber.

[0033] This invention solves the problems of particle agglomeration, cavity wall dead zones, powder splashing, and insufficient mixing uniformity in the prior art by the synergistic effect of various structures. Specifically, the mixing process is scientifically divided into three stages: initial dispersion, middle convection, and later homogenization, and the optimal structural action is matched for each stage.

[0034] Furthermore, the upper stirring blade 31, the middle stirring blade 32, and the lower stirring blade 33 are respectively connected to the output shaft of the stirring drive motor 1 via independent upper electromagnetic clutches, middle electromagnetic clutches, and lower electromagnetic clutches.

[0035] Furthermore, the electromagnetic clutch is a bidirectional clutch, capable of driving the stirring blade 32 to rotate in both directions.

[0036] Preferably, the upper stirring blade 31, the middle stirring blade 32, and the lower stirring blade 33 are all variable diameter structures, meaning the diameter at the root of the stirring blade is smaller than the diameter at the tip. At the same rotational speed, the linear velocity at the tip is much higher than that at the root, resulting in significantly stronger shear strength against high-viscosity slurries compared to conventional constant diameter blades.

[0037] For details, see Figure 1 , Figure 2 and Figure 4 The stirring drive motor 1 provides the original power output for the entire stirring system, while the upper electromagnetic clutch, middle electromagnetic clutch and lower electromagnetic clutch can be independently engaged or disengaged under the command of the controller, breaking the limitation of the overall synchronous movement of the traditional mixer blades, so that the upper, middle and lower blades can flexibly realize diverse action combinations according to the material state at different mixing stages.

[0038] In the initial dispersion stage (0-5 minutes, mainly the process of adding powder and a small amount of liquid), the material is mainly powder with a low liquid content, which easily leads to splashing and bottom sedimentation. The controller will control the upper electromagnetic clutch to engage based on the viscosity signal detected by the material viscosity sensor 7 (the viscosity is usually <500 cP at this time), driving the upper stirring blade 31 to rotate at a counterclockwise speed of 450-500 rpm. By tumbling upwards, the controller gathers the falling lumps of material, effectively suppressing powder splashing. At the same time, the controller controls the lower electromagnetic clutch to engage, causing the lower stirring blade 33 to rotate counterclockwise at a low speed of 300-350 rpm, gently stirring the material at the bottom and preventing powder from settling at the bottom of the cavity. During this stage, the middle electromagnetic clutch remains disengaged, and the middle stirring blade 32 is temporarily stationary to reduce unnecessary energy consumption.

[0039] Entering the mid-stage convection phase (5-12 minutes, the critical mixing period), as liquid is continuously added, the material viscosity gradually increases (usually reaching around 3000 cP). At this point, it is necessary to enhance global convection to break the laminar flow state. The controller will control the engagement of all three electromagnetic clutches (upper, middle, and lower), driving the three blades to work together. In particular, the middle electromagnetic clutch is a bidirectional clutch, which can drive the middle stirring blade 32 to rotate periodically in both directions at a speed of 380-430 rpm (switching rotation direction every 30 seconds). When rotating forward, it works with the upper stirring blade 31 to lift the material upward, and when rotating in reverse, it works with the lower stirring blade 33 to press the material downward, forming a strong "rolling" turbulence that completely eliminates mixing dead zones. At the same time, the upper stirring blade 31 and the lower stirring blade 33 maintain their original rotation direction, working with the middle stirring blade 32 to form a stable circulating flow field, further improving the uniformity of material mixing.

[0040] In the later homogenization stage (12-15 minutes, preparation before discharge), the slurry viscosity reaches its highest value (usually rising to 8000 cP), requiring high-intensity shear force to achieve final refinement. The three-stage electromagnetic clutch drives the impellers to uniformly switch to a high-speed, clockwise rotation of 450-500 rpm. Under this high-speed rotation, the impellers generate extremely high end-effector velocity, thereby applying strong shear force to the high-viscosity slurry, effectively breaking down residual micron-sized agglomerates and achieving fine homogenization of the slurry.

[0041] Furthermore, the front side of the guide plate 8 is provided with drag-reducing microgrooves 91, and the back side of the guide plate 8 is provided with turbulence-disrupting ribs 92.

[0042] Furthermore, the drag-reducing microgroove 91 is a V-shaped groove, and the extension direction of the V-shaped groove is consistent with the expected flow direction of the material on the surface of the guide plate 8.

[0043] Specifically, the guide plate 8 of this invention adopts a biomimetic structural design to reduce material residue in the mixing chamber and optimize the flow field. See also Figure 5 and Figure 6 The guide plate 8 is not a fixed structure. The angle of the guide plate 8 is adjusted by the angle adjustment motor 13 according to the viscosity of the material to meet the flow requirements of the material.

[0044] From a biomimetic design perspective, the structural design of the guide plate 8 is not simply a matter of imitating its shape, but rather an adaptive design tailored to the working environment of the mixing device. The front of the guide plate 8 is laser-engraved with V-shaped drag-reducing microgrooves 91, mimicking shark skin. The grooves extend in the same direction as the expected flow direction of the material on the surface of the guide plate 8. This design reduces the contact area between the slurry and the plate surface, lowering adhesion, and guides the material to form micro-vortices, enhancing local turbulence. The back of the guide plate 8 features semi-circular reverse-flow-disrupting ribs 92. When the guide plate 8 rotates to a specific angle, a slit is formed between the back of the guide plate 8 and the wall of the mixing chamber. The ribs 92 actively disturb the nearly stationary material within the slit, solving the problem of material accumulation in the dead zones of the chamber wall.

[0045] During each mixing stage, the angle of the guide plate 8 can be adjusted. For example, in the initial dispersion stage, when the material viscosity is <500 cP, the controller drives the angle adjustment motor 13 to adjust the guide plate 8 to 30°, with the sawtooth direction aligned with the upper left-handed paddle blade, guiding the tumbled material to gather towards the center of the cavity, further reducing the powder splash rate. In the intermediate convection stage, as the material viscosity rises to 3000 cP, the angle of the guide plate 8 is simultaneously adjusted to 38°, and the back turbulence ribs 92 drive the static material on the cavity wall to rotate, enhancing the convection throughout the entire area. In the later homogenization stage, when the viscosity reaches 8000 cP, the guide plate 8 is adjusted to 45°, and the front V-shaped microgrooves reduce slurry adhesion and guide the material to flow towards the discharge port 12, preparing for subsequent discharge.

[0046] Furthermore, the blade surfaces of the upper stirring blade 31, the middle stirring blade 32 and the lower stirring blade 33 are provided with micron-sized protrusions 15 and nano-sized grooves 16 formed between the protrusions.

[0047] For details, see Figure 7 This design is a lotus leaf-inspired superhydrophobic mixing impeller design. Similar to the guide plate 8, this design also emphasizes adaptation to the working environment of the mixing device. Through laser micromachining and chemical etching processes, a binary composite structure of micron-level protrusions 15 and nano-level grooves 16 is constructed on the impeller surface, significantly reducing the actual contact area between the slurry and the impeller surface, achieving a contact angle of over 150° and realizing a superhydrophobic effect. The height of the micron-level protrusions 15 is lower than the particle size of the positive electrode material, preventing the protrusions from trapping the material; the nano-level grooves 16 not only further reduce adhesion but also guide the transmission and expansion of ultrasonic vibration waves, enhancing the ultrasonic dispersion effect. This design not only greatly reduces the adhesion of highly viscous materials to the impeller surface, reducing cleaning burden and material loss, but also helps improve the utilization rate of ultrasonic energy.

[0048] Furthermore, the tip of the lower stirring blade 33 is provided with a flexible scraper strip, which contacts the inner wall of the mixing chamber.

[0049] Specifically, the flexible scraper (preferably made of PTFE material, which combines wear resistance and flexibility) at the tip of the lower mixing blade 33 remains in contact with the inner wall of the mixing chamber during blade rotation, continuously scraping away residual slurry on the chamber wall and carrying it back to the main mixing zone. This design, combined with the biomimetic material-repellent surface structure of the blade, forms an anti-residue system: the biomimetic material-repellent surface reduces material adhesion at the source (passive anti-sticking), while the flexible scraper actively removes adhered material (active cleaning). This dual action ensures no material accumulation inside the chamber, guaranteeing the accuracy of the formula ratio and improving the self-cleaning capability of the device, reducing the number of cleaning operations and time costs.

[0050] Furthermore, the ultrasonic stirring and mixing device also includes a controller, and the viscosity sensor 7, the angle adjustment motor 13, the upper electromagnetic clutch, the middle electromagnetic clutch, the lower electromagnetic clutch, the cavity ultrasonic generator 4, and the blade ultrasonic generator 5 are all communicatively connected to the controller.

[0051] As the core component of the device, the controller is connected to all other components via communication lines, enabling collaborative action between the various structures and forming a complete intelligent closed-loop control system. Specifically, the material viscosity sensor 7 is connected to the controller to monitor changes in material viscosity in real time and transmit the data to the controller; the angle adjustment motor 13 is connected to the guide plate 8, and adjusts the angle of the guide plate 8 by receiving commands from the controller; each electromagnetic clutch is connected to the stirring drive motor 1 and each stirring blade, respectively, and the controller controls the electromagnetic clutches to start / stop the stirring blades, switch their rotation direction, and adjust their speed; both the cavity ultrasonic generator 4 and the blade ultrasonic generator 5 are connected to the controller, which dynamically adjusts the frequency of the blade ultrasonic generator 5 according to the material viscosity, creating a beat frequency resonance effect with the cavity ultrasonic generator 4 to optimize the distribution of the ultrasonic energy field.

[0052] Furthermore, a discharge port 12 is provided at the bottom of the mixing chamber.

[0053] See Figure 1 and Figure 3 After mixing, the homogenized slurry can be discharged through the outlet 12 at the bottom of the mixing chamber. Since the guide plate 8 has been adjusted to 45° in the later homogenization stage, and with the drag-reducing microgrooves 91 on its front, the slurry can be guided to flow smoothly to the outlet 12, avoiding stratification during discharge.

[0054] This invention utilizes a combination of mechanical structure (three-section independently controlled impeller, flexible scraper, etc.), biomimetic design (shark skin-inspired guide plate 8, lotus leaf-inspired stirring paddle), and intelligent control (controller and viscosity sensor 7 working together) to divide the mixing process into three stages: initial dispersion, mid-term convection, and late-term homogenization. Optimal structural actions and parameters are matched to each stage, ultimately improving mixing quality, efficiency, and resource utilization. It is particularly suitable for mixing high-viscosity, multi-component materials such as lithium-ion battery cathode slurry and polymer composite materials.

[0055] The present invention will be described in more detail below through specific embodiments. These embodiments are merely descriptions of the preferred implementation of the present invention and do not limit the scope of the present invention in any way.

[0056] Example 1

[0057] An ultrasonic stirring and mixing device, such as Figure 1-8As shown: It includes a mixing chamber, a top cover 2, and a stirring drive motor 1 mounted on the top cover 2. The output shaft of the stirring drive motor 1 extends into the mixing chamber. An upper stirring blade 31, a middle stirring blade 32, and a lower stirring blade 33 are sequentially fixed along the axial direction on the output shaft. A chamber ultrasonic generator 4 is installed inside the side wall of the mixing chamber. A blade ultrasonic generator 5 is integrated inside the middle stirring blade 32. A guide plate 8 is rotatably connected to the inner wall of the mixing chamber via a rotating shaft. The guide plate 8 is connected to an angle adjustment motor 13 that drives its rotation. A material viscosity sensor 7 is also installed on the mixing chamber.

[0058] The upper stirring blade 31, middle stirring blade 32, and lower stirring blade 33 are respectively connected to the output shaft of the stirring drive motor 1 via independent upper, middle, and lower electromagnetic clutches. The middle electromagnetic clutch is a bidirectional clutch, capable of driving the middle stirring blade 32 to rotate in both directions. The front side of the guide plate 8 is provided with drag-reducing microgrooves 91. The drag-reducing microgrooves 91 are V-shaped grooves, and the extension direction of the V-shaped grooves is consistent with the expected flow direction of the material on the surface of the guide plate 8. The back side of the guide plate 8 is provided with turbulence-inducing ribs 92. The blade surfaces of the upper stirring blade 31, middle stirring blade 32, and lower stirring blade 33 are provided with micro-nano structures, which are micron-sized protrusions 15 and nano-sized grooves 16 formed between the protrusions. The tip of the lower stirring blade 33 is provided with a flexible scraper, which contacts the inner wall of the mixing chamber.

[0059] The ultrasonic stirring and mixing device further includes a controller, and the viscosity sensor 7, the angle adjustment motor 13, the upper electromagnetic clutch, the middle electromagnetic clutch, the lower electromagnetic clutch, the cavity ultrasonic generator 4, and the blade ultrasonic generator 5 are all communicatively connected to the controller.

[0060] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ultrasonic stirring and mixing device, characterized in that: It includes a mixing chamber, a top cover (2) and a stirring drive motor (1) mounted on the top cover (2), the output shaft of which extends into the mixing chamber; The output shaft is fixedly provided with an upper stirring blade (31), a middle stirring blade (32) and a lower stirring blade (33) in sequence from top to bottom along the axial direction; a cavity ultrasonic generator (4) is provided inside the side wall of the mixing chamber; a blade ultrasonic generator (5) is integrated inside the middle stirring blade (32); a guide plate (8) is rotatably connected to the inner wall of the mixing chamber through a rotating shaft, and the guide plate (8) is connected to an angle adjustment motor (13) that drives its rotation; a material viscosity sensor (7) is also provided on the mixing chamber.

2. The ultrasonic stirring and mixing device according to claim 1, characterized in that: The upper stirring blade (31), the middle stirring blade (32), and the lower stirring blade (33) are respectively connected to the output shaft of the stirring drive motor (1) via independent upper electromagnetic clutch, middle electromagnetic clutch, and lower electromagnetic clutch.

3. The ultrasonic stirring and mixing device according to claim 2, characterized in that: The electromagnetic clutch is a two-way clutch that can drive the stirring blade (32) to rotate in both directions.

4. The ultrasonic stirring and mixing device according to claim 1, characterized in that: The front side of the guide plate (8) is provided with drag-reducing microgrooves (91).

5. The ultrasonic stirring and mixing device according to claim 4, characterized in that: The drag-reducing micro-groove (91) is a V-shaped groove, and the extension direction of the V-shaped groove is consistent with the expected flow direction of the material on the surface of the guide plate (8).

6. The ultrasonic stirring and mixing device according to claim 4 or 5, characterized in that: The back of the guide plate (8) is provided with a turbulence rib (92).

7. The ultrasonic stirring and mixing device according to claim 1, characterized in that: The blade surfaces of the upper stirring blade (31), the middle stirring blade (32) and the lower stirring blade (33) are provided with micro-nano structures, which are micron-sized protrusions (15) and nano-sized grooves (16) formed between the protrusions.

8. The ultrasonic stirring and mixing device according to claim 4, characterized in that: The tip of the lower stirring blade (33) is provided with a flexible scraper, which contacts the inner wall of the mixing chamber.

9. The ultrasonic stirring and mixing device according to claim 2, characterized in that: It also includes a controller, and the viscosity sensor (7), the angle adjustment motor (13), the upper electromagnetic clutch, the middle electromagnetic clutch, the lower electromagnetic clutch, the cavity ultrasonic generator (4), and the blade ultrasonic generator (5) are all communicatively connected to the controller.

10. The ultrasonic stirring and mixing device according to claim 1, characterized in that: The bottom of the mixing chamber is provided with a discharge port (12).

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