Magnetic suspension stirring method for materials

Abstract

The invention relates to the technical field of magnetic suspension stirring, and particularly discloses a magnetic suspension stirring method for materials, which comprises the following steps: S1, preparation of materials and a stirring part: to-be-stirred materials are added into an accommodating container, and the magnetic suspension stirring part is arranged in the accommodating container; the stirring piece is provided with an axial response magnet, a radial response magnet, a motor rotor part and a stirring part; s2, magnetic suspension positioning: axial suspension of the stirring part is realized through magnetic repulsive force between an axial magnet below the accommodating container and an axial response magnet of the stirring part; radial suspension of the stirring piece is realized through magnetic repulsive force between a radial annular magnet on the circumferential periphery of the accommodating container and a radial response magnet of the stirring piece; and S3, magnetically-driven stirring: driving the stirring piece to rotate around a rotating axis through cooperation of a motor stator part on the circumferential periphery of the accommodating container and a corresponding motor rotor part of the stirring piece, and performing magnetic suspension stirring on the materials in the accommodating container through the stirring part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic suspension stirring, and particularly discloses a magnetic suspension stirring method for materials. BACKGROUND

[0002] Mechanical stirring is not suitable for high-purity materials because the stirring shaft penetrates the container wall, which is prone to produce impurities due to contact friction, and the sealing performance is poor, and it is not suitable for flammable and explosive materials. The traditional magnetic stirring is difficult to achieve full suspension of the stirring part, and the radial balance stability is insufficient. The suspension gap and the liquid level change are not suitable, and the effective magnetic field cooling mechanism is easy to affect the quality of heat-sensitive materials. At the same time, the design of the feeding and discharging and the flexibility of the stirring part are insufficient, which is difficult to adapt to various working conditions and continuous production, resulting in limited production reliability. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide a magnetic suspension stirring method for materials.

[0004] To achieve the above-mentioned purpose, the magnetic suspension stirring method for materials of the present application is characterized by comprising the following steps: S1 material and stirring part preparation: adding the material to be stirred into the containing container, and the containing container is provided with a magnetic suspension stirring part; the stirring part is provided with an axial response magnet, a radial response magnet, a motor rotor part and a stirring part; S2 magnetic suspension positioning: the axial suspension of the stirring part is realized by the magnetic repulsion between the axial magnet below the containing container and the axial response magnet of the stirring part; the radial suspension of the stirring part is realized by the magnetic repulsion between the radial annular magnet on the circumferential periphery of the containing container and the radial response magnet of the stirring part; S3 magnetic drive stirring: the stirring part is driven to rotate around the rotation axis by the cooperation of the motor stator part on the circumferential periphery of the containing container and the corresponding motor rotor part of the stirring part, and the material in the containing container is subjected to magnetic suspension stirring by the stirring part.

[0005] The method realizes full suspension of the stirring part through axial and radial magnetic repulsion, completely eliminates the contact friction between the shaft sleeve and the stirring shaft in the traditional stirring, and avoids the contamination of the material caused by wear from the root. It is especially suitable for high-purity and high-precision material stirring requirements. The magnetic drive method does not need to penetrate the transmission structure of the container wall, which ensures the sealing performance of the containing container, prevents the material from volatilizing, leaking or external pollutants from entering, and is suitable for flammable, explosive, toxic and harmful special materials. The three-step process is logical and coherent, from preparation to positioning and then to stirring, and the multi-component cooperative design of the stirring part does not interfere with each other, which not only ensures the suspension stability, but also improves the stirring power transmission efficiency, effectively improves the material stirring uniformity and stirring efficiency, and adapts to different viscosity and different nature of the material stirring scene.

[0006] Further, in S1, the axial response magnet, the radial response magnet and the motor rotor part of the stirring piece each comprise a permanent magnet ring, a silicon steel sheet ring matched with the permanent magnet ring, and a non-magnetic body separating the permanent magnet ring and the silicon steel sheet ring, the permanent magnet ring, the silicon steel sheet ring and the non-magnetic body forming a composite structure, and the composite structure is coated with a non-magnetic protective layer.

[0007] The permanent magnet ring in the composite structure provides a stable magnetic field basis, the silicon steel sheet ring has excellent magnetic conductivity, can enhance the magnetic field strength and optimize the magnetic field distribution, and can improve the magnetic suspension positioning accuracy and the magnetic driving response speed; the non-magnetic body effectively separates the permanent magnet ring and the silicon steel sheet ring, avoids mutual interference of the magnetic fields of the two, and ensures the independent and stable functions of the components. The external non-magnetic protective layer can provide comprehensive protection for the internal composite structure, prevent the material from corroding and wearing the magnets and the silicon steel sheet, and prolong the service life of the stirring piece. The structure design takes into account the magnetic field performance and structural protection, so that the stirring piece can not only meet the technical requirements of magnetic suspension and magnetic driving, but also can adapt to complex material environments such as corrosion and high hardness, thereby expanding the application range of the stirring method.

[0008] Further, the non-magnetic protective layer is welded and coated on the outside of the composite structure through a cold welding process, the welding temperature is 180-280℃, and the non-magnetic protective layer is made of non-magnetic stainless steel.

[0009] The cold welding process does not require high-temperature heating, and the welding temperature of 180-280℃ can avoid demagnetization of the permanent magnet ring caused by high temperature, ensure that the original magnetic performance of the magnet is not affected, prevent the silicon steel sheet ring from deforming due to high temperature, and ensure the integrity and performance stability of the composite structure. The non-magnetic stainless steel material has non-magnetic, high strength and corrosion resistance, so as a protective layer, it will not interfere with the magnetic field distribution, can resist the corrosion of various acid and alkali materials, has high structural strength, and can withstand the dynamic impact force in the stirring process. The cold welding process has high welding strength and good weld tightness, can effectively prevent the material from penetrating between the protective layer and the composite structure, avoid the corrosion of the internal components, further prolong the service life of the stirring piece, ensure the structural stability during stirring, and improve the reliability of the stirring method.

[0010] Further, in S2, the radial annular magnet comprises an annular fixing ring arranged around the containing container, a plurality of protruding parts arranged on the annular fixing ring, and a plurality of coil units respectively arranged on the plurality of protruding parts, the protruding parts being located between the annular fixing ring and the containing container, and the magnetic field strength of the radial annular magnet being adjusted by the current size of the coil units.

[0011] The annular fixing ring and multiple protrusions in the structural design ensure that the coil units are evenly distributed around the circumference of the container, forming a uniform surrounding magnetic field. This ensures radial force balance on the stirring component, improves the stability of radial suspension, and prevents radial displacement of the stirring component during rotation. The coil units adjust the magnetic field strength by changing the current, flexibly adapting to stirring components of different sizes and weights. They can also adjust the radial suspension force in real time according to changes in material viscosity to address potential radial disturbances during stirring and ensure stable suspension. This structural design combines fixation and adjustability, providing a stable installation foundation for the radial magnetic field while dynamically adapting the magnetic field strength through current adjustment, thus improving the accuracy and flexibility of magnetic levitation positioning.

[0012] Furthermore, in S2, the axial magnet is a permanent magnet or an electromagnet; when the axial magnet is an electromagnet, the magnetic field strength of the axial magnet is adjusted by changing the current to maintain the suspension gap between the stirring piece and the bottom wall of the container at 2-20mm.

[0013] Axial magnets offer a choice of permanent magnets and electromagnets. Permanent magnets are simple in structure and low in cost, suitable for scenarios with stable stirring conditions and fixed suspension gap requirements. Electromagnets allow for adjustment of the magnetic field strength via current, offering greater adaptability and enabling real-time adjustment of the axial suspension force based on changes in the weight of the stirring components and material resistance. The 2-20mm suspension gap design is scientifically sound, preventing wear caused by contact between the stirring components and the container bottom wall while ensuring effective stirring of the material at the bottom of the container, preventing material sedimentation. The adjustable function of the electromagnet allows for precise control of the suspension gap, adapting to containers of different depths and materials at different liquid levels, improving the versatility and adaptability of the stirring method, and ensuring the stability and reliability of axial suspension.

[0014] Furthermore, during the S3 stirring process, a liquid level sensor is used to monitor changes in the liquid level of the material in the container. By adjusting the current of the axial magnet generating unit, the strength of the axial magnet is changed, so that the suspension height of the stirring component is dynamically adjusted with the liquid level. The adjustment range is 0.5-3cm, ensuring that the stirring part is always in the effective stirring area of ​​the material.

[0015] Real-time monitoring of liquid level changes and dynamic adjustment of the suspension height solves the problem of traditional mixing where liquid level fluctuations cause the mixing part to detach from the material or result in incomplete mixing. This ensures that the mixing part is always in full contact with the material, guaranteeing uniform mixing. The 0.5-3cm adjustment range covers the liquid level fluctuation range in common material mixing processes, adapting to various liquid level change scenarios such as feeding, discharging, and reaction consumption, and is particularly suitable for industrial production conditions with continuous feeding and discharging. The axial magnetic field strength is adjusted by current, providing rapid response and precise adjustment. It can compensate for the impact of liquid level changes on the mixing effect in real time, avoiding a decrease in mixing efficiency due to liquid level fluctuations, improving the automation level and production continuity of the mixing method, and ensuring the stability of product quality.

[0016] Furthermore, in S3, a cooling component is configured around the container, and the cooling component around the container is activated to achieve cooling operation. The temperature outside the container is controlled within a preset range by means of air cooling and / or water cooling to stabilize the strength of each magnetic field.

[0017] Magnetic field strength is easily affected by temperature. High temperatures can cause permanent magnets to demagnetize and electromagnets to weaken, impacting the positioning accuracy and driving efficiency of magnetic levitation. Air cooling and / or water cooling effectively control the temperature outside the container, preventing components such as the motor stator, axial magnets, and radial annular magnets from overheating and ensuring stable magnetic field strength. A stable magnetic field environment keeps the suspension and rotation speed of the stirring components stable, preventing vibration and displacement due to magnetic field fluctuations and improving the smoothness of the stirring process. Simultaneously, cooling prevents high temperatures from transferring to the interior of the container, protecting the properties of heat-sensitive materials, expanding the applicability of the stirring method to heat-sensitive and high-temperature-decomposable materials, and extending the service life of the magnetic field components.

[0018] Furthermore, in S1, an inlet is provided on the upper side wall or top wall of the container to inject material into the container; an outlet is provided on the bottom wall of the container, the central axis of the outlet coincides with the rotation axis of the agitator, and the axial response magnet and axial magnet are arranged around the outlet to discharge the agitated material from the container.

[0019] The feed inlet is located on the upper side wall or top wall to prevent material from directly impacting the agitator during feeding, thus preventing interference with the agitator's suspension state and ensuring that the feeding and agitation processes can be synchronized, improving production efficiency. The discharge outlet is located on the bottom wall and coincides with the rotation axis of the agitator. Combined with the centrifugal force generated by the rotation of the agitator, it promotes rapid and smooth material discharge, reducing material residue at the bottom of the container and simplifying cleaning. Axial response magnets and axial magnets are arranged around the discharge outlet, which does not occupy the discharge channel space and ensures that the axial magnetic field uniformly covers the bottom of the agitator, maintaining axial suspension stability and enabling continuous and smooth feeding, agitation, and discharge. This meets the needs of continuous industrial production and improves the continuity and convenience of the production process.

[0020] Furthermore, the stirring component has a hollow column, a foamed material body filled in the hollow column, a connecting block located in the hollow column, a first connecting rod connecting the connecting block and the radial response magnet, and a second connecting rod connecting the connecting block and the motor rotor. The stirring part is located in the hollow column, the connecting rod, the radial response magnet, or the motor rotor.

[0021] The combination of a hollow column and internal foamed material significantly reduces the overall weight of the mixing components while ensuring structural strength. This lowers the magnetic field strength required for magnetic levitation, reducing energy consumption. The foamed material also provides cushioning, absorbing vibrations during mixing and improving levitation stability. The structural design of the connecting block and the first and second connecting rods ensures a secure connection between the radial response magnet, the motor rotor, and the hollow column, guaranteeing efficient and smooth power transmission and preventing component loosening during rotation. The mixing unit can be flexibly positioned in multiple locations, allowing for adjustments to its distribution and structure based on material characteristics and container size. This adapts to different mixing needs, enhancing the flexibility and adaptability of the mixing method and ensuring thorough mixing in all areas of the container, thus improving mixing uniformity.

[0022] Furthermore, an enlarged shell is set at the bottom of the hollow column, and an axial response magnet is installed inside the enlarged shell. The axial response magnet is arranged around the hollow column. Both the hollow column and the enlarged shell are made of non-magnetic stainless steel by cold welding process, and the wall thickness of the hollow column and the enlarged shell is 1.5mm-2.5mm.

[0023] The enlarged shell provides dedicated mounting space for the axial response magnet, allowing it to surround the hollow column. This ensures precise alignment between the axial response magnet and the axial magnet below, optimizes the axial magnetic field distribution, and improves the accuracy of axial levitation positioning. The hollow column and enlarged shell are made of non-magnetic stainless steel to avoid interference with the magnetic field. Continuing the advantages of cold welding, this ensures a strong structural connection and good sealing, preventing material from seeping into the internal components and corroding them. The 1.5mm-2.5mm wall thickness design balances structural strength and lightweight requirements, ensuring structural stability of the mixing component during rotation and levitation without adding excessive weight due to excessive wall thickness. This ensures the high efficiency of magnetic levitation and further extends the service life and reliability of the mixing component.

[0024] The beneficial effects of this invention are as follows: This magnetic levitation stirring method achieves full levitation of the stirring component through axial and radial magnetic repulsion, eliminating contact friction, avoiding impurity contamination, and is suitable for high-purity materials; magnetic drive does not require penetration of the container wall, ensuring sealing, and is suitable for flammable, explosive, and other special materials; the three-step process is seamless, improving stirring uniformity and efficiency. The composite structure enhances magnetic field performance, the non-magnetic protective layer prevents corrosion, and extends the life of the stirring component; the radial ring magnet ensures radial balance, and the adjustable current provides strong adaptability; the dual selection of axial magnets and the scientifically designed 2-20mm levitation gap adapt to different scenarios. Dynamic liquid level adjustment of 0.5-3cm adapts to changes in liquid level and ensures stirring effect; cooling operation stabilizes the magnetic field and protects heat-sensitive materials; the inlet and outlet design adapts to continuous production; the lightweight stirring component reduces energy consumption, has a stable structure, and a flexible stirring part, adapting to various materials and working conditions, improving production continuity and reliability. Attached Figure Description

[0025] Figure 1 This is a flowchart of a magnetic levitation stirring method for materials according to the present invention; Figure 2 This is a schematic diagram of the structure of the magnetic levitation stirring device of the present invention; Figure 3 This is a cross-sectional view of the magnetic levitation stirring device of the present invention; Figure 4 This is a partial structural diagram of the magnetic levitation stirring device of the present invention. Figure 1 ; Figure 5 This is a partial structural diagram of the magnetic levitation stirring device of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the structure of the stirring float of the magnetic levitation stirring device of the present invention.

[0026] The reference numerals in the attached drawings include: 1. Frame; 2. Controller; 3. Container; 4. Stirring element; 5. Axial response magnet; 6. Radial response magnet; 7. Hollow column; 8. Motor rotor; 9. Stirring part; 11. Outer barrel; 12. Support assembly; 13. Radial annular magnet; 14. Adjustment assembly; 15. Motor stator; 16. Feed inlet; 17. Discharge outlet; 18. Cover; 19. Opening and closing assembly; 21. Annular fixing ring; 22. Protrusion; 23. Coil unit; 24. Permanent magnet ring; 25. Silicon steel sheet ring; 26. Non-magnetic element; 27. Rod-shaped structure; 28. Hole; 32. Axial magnet; 33. Stainless steel ring; 34. Enlarged shell; 35. Cooling assembly. Detailed Implementation

[0027] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0028] Please see Figures 1 to 6As shown, the present invention provides a magnetic levitation stirring method for materials, characterized by comprising the following steps: S1 Material and stirring element 4 preparation: The material to be stirred is added into a container 3, the container 3 containing a magnetically levitation stirring element 4; the stirring element 4 is provided with an axially responsive magnet 5, a radially responsive magnet 6, a motor rotor 8, and a stirring part 9; S2 Magnetic levitation positioning: The stirring element 4 is axially levited by the magnetic repulsion between the axial magnet 32 ​​below the container 3 and the axially responsive magnet 5 of the stirring element 4; the stirring element 4 is radially levited by the magnetic repulsion between the radially annular magnet 13 on the periphery of the container 3 and the radially responsive magnet 6 of the stirring element 4; S3 Magnetic driving stirring: The stirring element 4 is driven to rotate around the rotation axis by the cooperation between the motor stator 15 on the periphery of the container 3 and the corresponding motor rotor 8 of the stirring element 4, and the stirring part 9 performs magnetic levitation stirring of the material in the container 3.

[0029] The core of this step is to achieve contactless mixing through "magnetic levitation positioning + magnetic drive rotation," ensuring uniform mixing of materials and avoiding contamination. During implementation, the material to be mixed (such as liquid, powder, or mixture) is first injected into the container 3 through the pre-set feed inlet 16, ensuring that the liquid level does not exceed 80% of the container's rated capacity to prevent overflow during mixing.

[0030] The mixing component 4 needs to be pre-assembled. The axial response magnet 5, radial response magnet 6, and motor rotor 8 are arranged sequentially along the axis of the mixing component 4. The mixing part 9 (such as stirring blades or agitator) is fixed to the outside of the mixing component 4 and located within the material mixing area. During the magnetic levitation positioning stage, the axial magnet 32 ​​is installed directly below the container 3, coaxially aligned with the axial response magnet 5 of the mixing component 4. Through permanent magnet repulsion or controllable electromagnetic repulsion, the mixing component 4 is detached from the bottom wall of the container. The radial annular magnet 13 surrounds the outer circumference of the container and radially corresponds to the radial response magnet 6, using the annularly distributed repulsion to counteract the radial offset force of the mixing component 4. During the magnetic drive stage, the motor stator 15 maintains a radial gap of 5-10 mm with the motor rotor 8. Three-phase alternating current is supplied to the stator to generate a rotating magnetic field, driving the rotor to rotate synchronously, thereby driving the mixing part 9 to rotate at a speed of 50-500 r / min. The mechanical action of the mixing part 9 breaks the laminar flow state of the material, achieving uniform mixing. The entire process requires no mechanical shaft connection, avoiding shaft seal leakage and material contamination problems.

[0031] Specifically, in S1, the axial response magnet 5, the radial response magnet 6, and the motor rotor part 8 of the stirring component 4 all include a permanent magnet ring 24, a silicon steel sheet ring 25 that cooperates with the permanent magnet ring 24, and a non-magnetic material 26 that isolates the permanent magnet ring 24 and the silicon steel sheet ring 25. The permanent magnet ring 24, the silicon steel sheet ring 25, and the non-magnetic material 26 constitute a composite structure, and the outside of the composite structure is covered with a non-magnetic protective layer.

[0032] The composite structure design of the stirring component 4 aims to balance magnetic response performance, structural strength, and magnetic field stability, while the non-magnetic protective layer ensures the corrosion resistance and service life of the stirring component 4. During implementation, the permanent magnet ring 24 (such as a neodymium iron boron permanent magnet, with magnetization direction along the axial or radial direction), the silicon steel sheet ring 25 (with a stack thickness of 5-10 mm to improve magnetic permeability), and the non-magnetic component 26 (such as a polytetrafluoroethylene ring, with a thickness of 2-5 mm) are first processed according to the design dimensions.

[0033] During assembly, the non-magnetic element 26 is sandwiched between the permanent magnet ring 24 and the silicon steel sheet ring 25, ensuring that the three are coaxially fitted, forming a sandwich-like composite structure of "permanent magnet ring 24 - non-magnetic element 26 - silicon steel sheet ring 25". The non-magnetic element 26 can block the direct contact between the permanent magnet ring 24 and the silicon steel sheet ring 25, avoiding excessive hysteresis loss. The silicon steel sheet ring 25 is made of high-permeability oriented silicon steel, made of 0.35-0.5mm thin sheets with an insulating coating between the sheets. The sheet thickness is 5-10mm. Its inner diameter is fitted with the permanent magnet ring 24, and its end face is finely ground and fitted. It is fixed by rivets through positioning holes. With its high magnetic permeability, it can serve as a dedicated magnetic path to guide the magnetic field lines of the permanent magnet ring 24 to concentrate through itself, significantly reducing magnetic resistance and reducing magnetic field leakage to non-working areas. This allows the magnetic field lines to converge in a directional manner and enhances the magnetic coupling effect with external axial / radial magnets and motor stator, increasing the magnetic flux density by 30-50%. At the same time, the laminated insulation design reduces eddy current losses, achieving efficient focusing and optimization of the magnetic circuit, and ensuring precise and stable magnetic response of the stirring component 4.

[0034] Subsequently, a non-magnetic protective layer was applied using a cold welding process. 316L non-magnetic stainless steel (1-2mm thick) was selected as the protective layer material and cut into ring-shaped plates matching the outer circumference of the composite structure. These plates were then welded in sections along the outer circumference of the composite structure using resistance cold welding equipment at a low temperature of 180-280℃. The welding pressure was controlled at 0.3-0.5MPa to ensure a dense, pore-free weld. The cold welding temperature is lower than the Curie temperature of the permanent magnet (typically >300℃), which avoids the attenuation of the permanent magnet's magnetic force. Simultaneously, the non-magnetic protective layer does not interfere with magnetic field penetration and also prevents corrosion and wear of the internal magnets and silicon steel sheets by the materials.

[0035] Specifically, the non-magnetic protective layer is welded onto the outside of the composite structure using a cold welding process at a temperature of 180-280℃. The non-magnetic protective layer is made of non-magnetic stainless steel.

[0036] The core of this cold welding process is to achieve a metallurgical bond between the protective layer and the composite structure at low temperatures, ensuring connection strength without compromising the performance of internal components. During implementation, the welding surfaces of the outer periphery of the composite structure and the non-magnetic stainless steel protective layer are pre-treated by sanding to remove oxide scale and oil, ensuring a surface roughness Ra = 1.6-3.2 μm to improve weld adhesion.

[0037] A medium-frequency inverter cold welding power supply (output current 50-150A) is selected, equipped with copper alloy electrodes (good conductivity and wear resistance). After the protective layer surrounds the composite structure, the electrodes move at a uniform speed along the overlap of the protective layer. The contact resistance between the electrode and the workpiece generates a local high temperature of 180-280℃, causing the metal at the contact surface to melt and bond. During the welding process, the temperature gradient must be controlled, gradually increasing from 180℃ to 280℃ to avoid local overheating that would reduce the magnetic force of the permanent magnet ring 24. At the same time, the welding speed must be kept uniform (5-10mm / s) to ensure that the protective layer completely covers the composite structure without any missed welds or incomplete welds.

[0038] After welding, the weld seam is sanded to remove burrs and protrusions, making the outer surface of the protective layer smooth and flat, avoiding material vortex or material sticking during stirring. The material properties of non-magnetic stainless steel can ensure that the stirring component 4 can be used for a long time in corrosive materials such as acids and alkalis, while the high-strength connection of cold welding can resist centrifugal force and material impact during stirring.

[0039] Specifically, in S2, the radial annular magnet 13 includes an annular fixing ring 21 surrounding the container 3, a plurality of protrusions 22 disposed on the annular fixing ring 21, and a plurality of coil units 23 disposed on the plurality of protrusions 22 respectively. The protrusions 22 are located between the annular fixing ring 21 and the container 3. The magnetic field strength of the radial annular magnet 13 is adjusted by the magnitude of the current of the coil units 23.

[0040] The radial annular magnet 13 is designed to provide controllable radial repulsion, achieving stable radial suspension of the stirring component 4. The magnetic field adjustment function can adapt to suspension requirements under different working conditions. During implementation, first process the annular fixing ring 21 (made of non-magnetic aluminum alloy, with an inner diameter 10-20mm larger than the outer diameter of the container 3). Then, process 6-8 protrusions 22 evenly along the circumference on the inner side of the fixing ring (each protrusion 22 has a radial length of 5-10mm and a width consistent with the thickness of the fixing ring). Maintain a gap of 3-5mm between the protrusions 22 and the outer wall of the container 3 to avoid contact friction.

[0041] Each protrusion 22 is wound with a coil unit 23, using φ0.5-1.0mm enameled copper wire, with 50-100 turns. Terminals are led out at both ends of the coil for connection to an external controllable power supply. During installation, the annular fixing ring 21 is fixed to the outer circumference of the container 3 by a bracket, ensuring that the protrusion 22 and the radial response magnet 6 of the stirring component 4 are in the same radial plane. For magnetic field adjustment, an adjustable current of 0.5-5A is output through a programmable DC power supply, which is applied to the coil unit 23 to generate a radial magnetic field; the larger the current, the stronger the magnetic field.

[0042] During the stirring process, if the stirring component 4 is radially offset (which can be monitored by an infrared displacement sensor), the controller 2 adjusts the current of the coil of the corresponding protrusion 22 in real time to increase the magnetic repulsion force on the offset side, counteract the offset force, and keep the stirring component 4 always in the center of the rotation axis. The radial suspension deviation is controlled within ±0.5mm, ensuring stable stirring and preventing contact with the inner wall of the container.

[0043] Specifically, in S2, the axial magnet 32 ​​is a permanent magnet or an electromagnet; when the axial magnet 32 ​​is an electromagnet, the magnetic field strength of the axial magnet 32 ​​is adjusted by changing the current to maintain the suspension gap between the stirring piece 4 and the bottom wall of the container 3 at 2-20mm.

[0044] The core design feature of the axial magnet 32 ​​is to provide a stable axial repulsive force. This is achieved by adjusting the magnetic field to maintain a reasonable suspension gap between the stirring component 4 and the bottom wall of the container, thus preventing contact wear. During implementation, if a permanent magnet (such as a neodymium iron boron permanent magnet with a magnetic field strength of 1000-2000 Gs) is selected, the required magnetic force must be calculated based on the total weight of the stirring component 4 (including the magnet, protective layer, stirring part 9, etc.). A permanent magnet of the appropriate specification should be selected and installed on a bracket directly below the bottom wall of the container 3, coaxially aligned with the axial response magnet 5 of the stirring component 4. The stirring component 4 is suspended by the fixed permanent magnet repulsive force. The suspension gap is preset to 2-20 mm (selected according to material characteristics; 5-20 mm for powder materials and 2-10 mm for liquid materials).

[0045] If an electromagnet is used, a ring-shaped electromagnetic coil (100-200 turns, enameled wire φ1.0-1.5mm) needs to be installed below the container, connected to an adjustable DC power supply and a PID controller 2. Simultaneously, a distance sensor (accuracy ±0.1mm) should be installed on the bottom wall of the container to monitor the gap between the stirring element 4 and the bottom wall in real time. When the gap is less than 2mm, the controller 2 increases the input current of the electromagnet (the change in current is proportional to the change in gap), strengthening the repulsive force and causing the stirring element 4 to move upwards. When the gap is greater than 20mm, the current is reduced to decrease the repulsive force, causing the stirring element 4 to move downwards. Ultimately, the suspension gap is stabilized within the set range, ensuring that the stirring element 4 neither touches the bottom wall of the container nor fails to provide sufficient stirring space for the stirring section 9.

[0046] Specifically, during the S3 stirring process, the liquid level sensor monitors the changes in the liquid level of the material in the container 3, and the strength of the axial magnet 32 ​​is changed by adjusting the current of the axial magnet 32 ​​generating unit, so that the suspension height of the stirring part 4 is dynamically adjusted with the liquid level. The adjustment range is 0.5-3cm, ensuring that the stirring part 9 is always in the effective stirring area of ​​the material.

[0047] The core of this function is to adjust the suspension height of the stirring component 4 in real time through liquid level feedback, ensuring that the stirring part 9 is always in the effective stirring area and guaranteeing the uniformity of stirring. In implementation, an ultrasonic liquid level sensor (measuring range 0-50cm, accuracy ±0.1cm) is installed on the top wall of the container 3. The sensor probe is vertically downward and aimed at the material liquid surface to collect liquid level data in real time and transmit it to the PLC controller 2.

[0048] The controller 2 pre-stores the correspondence between liquid level and suspension height (e.g., for every 1cm increase in liquid level, the suspension height is adjusted upwards by 0.8-1cm). Before stirring begins, the initial suspension height of the stirring component 4 is set according to the initial liquid level (ensuring that the stirring part 9 is immersed in the material to a depth of 2-5cm). During stirring, if the liquid level changes due to evaporation, feeding, or changes in reaction volume (e.g., the liquid level drops by 0.5cm), the sensor detects the change, and the controller 2 immediately calculates the required suspension height adjustment value. By adjusting the current (electromagnet) of the axial magnet 32 ​​or switching the magnetic force setting (permanent magnet group) of the permanent magnet, the magnitude of the axial repulsive force is changed, so that the suspension height of the stirring component 4 is adjusted accordingly. The adjustment range is strictly controlled within 0.5-3cm.

[0049] For example, when the liquid level rises and the stirring part 9 is immersed too deeply, the suspension height is appropriately increased; when the liquid level drops and the stirring part 9 is exposed above the liquid surface, the suspension height is reduced to ensure that the stirring part 9 is always in full contact with the material and to avoid "dry stirring" or "insufficient stirring".

[0050] Specifically, in S3, a cooling component 35 is configured around the container 3, the cooling component 35 around the container 3 is activated, and the cooling component 35 is used to achieve cooling operation. The temperature outside the container 3 is controlled within a preset range by air cooling and / or water cooling to stabilize the strength of each magnetic field.

[0051] The purpose of the cooling operation is to control the temperature on the outside of the container 3, preventing excessively high temperatures from causing the magnet's magnetic force to weaken and the coil to overheat and be damaged, thus ensuring the stability of the magnetic field and the reliability of the equipment. During implementation, air cooling, water cooling, or a combination of cooling methods should be selected based on the temperature requirements of the material being stirred. If air cooling is used, 4-6 axial flow fans (wind speed 3-5 m / s, power 50-100W) should be evenly installed around the circumference of the container 3. The fans should be fixed with brackets, and the air outlets should face the outer wall of the container. The fans should be linked to a temperature sensor (installed on the outer wall of the container, measurement range 0-100℃), with a preset temperature range of 25-40℃.

[0052] When the sensor detects that the temperature outside the container exceeds 40℃, controller 2 starts the fan or increases the fan speed to accelerate the airflow around the container's outer wall and remove heat. When the temperature is below 25℃, the fan speed is reduced or the fan is turned off. If water cooling is used, a spiral water cooling jacket (made of copper or stainless steel, with a wall thickness of 2-3mm) is installed on the outside of the container. The inlet of the water cooling jacket is connected to a constant temperature water tank (the water temperature is controlled at 20-30℃), and the outlet is connected to a return water tank. The cooling water is circulated by a water pump, and the flow rate is controlled at 5-10L / min.

[0053] When the temperature outside the container exceeds the preset value, the cooling water flow rate is increased; when the temperature is too low, the flow rate is reduced. If the material stirring generates a large amount of heat, air cooling and water cooling can be activated simultaneously. Through the synergistic effect of air cooling and water cooling, the temperature outside the container is quickly reduced, ensuring that the temperature of the axial magnet 32, the radial annular magnet 13, and the motor stator 15 remains stable within a safe range. This prevents the magnetic field strength from decreasing due to temperature rise, ensuring the stability of magnetic levitation positioning and magnetic drive stirring.

[0054] Specifically, in S1, a feed inlet 16 is provided on the upper side wall or top wall of the container 3 to inject material into the container 3; a discharge outlet 17 is provided on the bottom wall of the container 3, the central axis of the discharge outlet 17 coincides with the rotation axis of the stirring component 4, and the axial response magnet 5 and the axial magnet 32 ​​are arranged around the discharge outlet 17 to discharge the stirred material in the container 3.

[0055] The structural design of the inlet 16 and outlet 17 is intended to facilitate material entry and exit while not interfering with the magnetic levitation and rotation of the agitator 4, ensuring a continuous and smooth mixing process. In implementation, the inlet 16 is located on the upper side or top wall of the container 3, preferably on the center side of the top wall (5-10cm from the rotation axis of the agitator 4). It adopts a circular structure (5-10cm in diameter) and is equipped with a flap or valve with a sealing gasket. During feeding, the flap is opened, and material is injected into the container through a funnel or pipe at a rate controlled at 0.5-1L / min to prevent material from impacting the agitator 4 and causing it to shift. After feeding, the flap is closed to ensure container sealing (if a sealed mixing scenario is required).

[0056] The discharge port 17 is located at the center of the bottom wall of the container 3, with its central axis completely coinciding with the rotation axis of the agitator 4. It adopts a circular structure (3-8cm in diameter) and is equipped with a ball valve or butterfly valve (made of the same material as the container, non-magnetic and corrosion-resistant). The axial response magnet 5 and the axial magnet 32 ​​are both designed as rings, with an inner diameter 2-3cm larger than the diameter of the discharge port 17. They are installed around the outside of the discharge port 17 to ensure uniform magnetic field distribution and to prevent interference from the structure of the discharge port 17. After mixing, the valve of the discharge port 17 is opened, and the mixed material is discharged vertically along the discharge port 17 under the action of gravity. Because the discharge port 17 coincides with the rotation axis, material residue in the container is avoided, and the suspension state of the agitator 4 is not affected (the agitator 4 can remain suspended or stop during the discharge process), realizing an automated process of continuous feeding, mixing, and discharging.

[0057] Specifically, the stirring component 4 has a hollow column 7, a foamed material body filled in the hollow column 7, a connecting block located in the hollow column 7, a first connecting rod connecting the connecting block and the radial response magnet 6, and a second connecting rod connecting the connecting block and the motor rotor 8. The stirring part 9 is located in the hollow column 7, the connecting rod, the radial response magnet 6 or the motor rotor 8.

[0058] The overall structural design of the stirring component 4 aims to integrate magnetic response, drive, and stirring functions, while also considering lightweight design and structural stability to ensure smooth magnetic levitation and rotation. During implementation, a hollow column 7 (non-magnetic stainless steel, 20-50mm in diameter, 30-80mm in length) is first machined, and then filled with polyurethane foam (density 0.3-0.5g / cm³). 3 During filling, ensure that the foam material is uniform and dense, without air bubbles or gaps, so as to reduce weight and shock absorption and reduce the repulsive force required for magnetic levitation.

[0059] A connecting block (made of aluminum alloy, cylindrical) is installed at the center of the hollow column 7 and fixed by threads or welding. Two radial connection interfaces are pre-drilled on the connecting block, connecting to the first connecting rod and the second connecting rod (both non-magnetic stainless steel, 5-10mm in diameter), respectively. The other end of the first connecting rod is welded to the radial response magnet 6 (ensuring coaxiality), and the other end of the second connecting rod is fixed to the motor rotor 8, so that the radial response magnet 6 and the motor rotor 8 are located at different heights of the hollow column 7, without interfering with each other. The stirring part 9 is selected according to the material type. For liquid materials, 3-4 stirring blades (tilt angle 30-45°) can be welded to the outside of the hollow column 7; for powder materials, an anchor-type stirring paddle can be installed on the outside of the first connecting rod or the radial response magnet 6. The installation position of the stirring part 9 must ensure that it is completely immersed in the material when the stirring component 4 is suspended.

[0060] In the overall structure, all components are made of non-magnetic materials (except for magnets and silicon steel sheets) to avoid interfering with the magnetic field. At the same time, the lightweight design (total weight controlled at 0.5-2kg) can reduce the energy consumption of magnetic levitation. The rigid design of the connecting block and connecting rod can resist the centrifugal force during rotation, ensuring that the stirring component 4 is free from deformation and shaking when rotating at high speed.

[0061] Specifically, an enlarged housing 34 is provided at the bottom of the hollow column 7, and an axial response magnet 5 is installed inside the enlarged housing 34. The axial response magnet 5 is arranged around the hollow column 7. Both the hollow column 7 and the enlarged housing 34 are made of non-magnetic stainless steel by cold welding process, and the wall thickness of the hollow column 7 and the enlarged housing 34 is 1.5mm-2.5mm.

[0062] The structural design aims to provide installation space for the axially responsive magnet 5 while ensuring the axial stability and magnetic field compatibility of the stirring component 4. In implementation, the hollow column 7 is made of 304 or 316L non-magnetic stainless steel, cold-drawn, with a wall thickness controlled between 1.5-2.5mm (selected according to the weight of the stirring component 4; 1.5mm for lighter components and 2.5mm for heavier components), ensuring the column has sufficient structural strength without excessive wall thickness affecting magnetic field penetration.

[0063] The enlarged housing 34 is also made of non-magnetic stainless steel and machined into a cylindrical shape (10-20mm larger in diameter and 15-30mm higher in height than the hollow column 7). It is welded to the bottom of the hollow column 7 using a cold welding process, with the welding temperature controlled at 200-250℃. The weld seam surrounds the circumference of the bottom of the hollow column 7 to ensure a firm and leak-free connection. The axial response magnet 5 is machined into a ring shape (1-2mm smaller in outer diameter than the inner diameter of the enlarged housing 34 and 5-10mm thick). It is fixed inside the enlarged housing 34 by press fitting or non-magnetic adhesive bonding, ensuring that the magnet is coaxially arranged around the hollow column 7 and precisely corresponds to the axial magnet 32 ​​below.

[0064] The bottom of the enlarged shell 34 is designed as a flat structure to avoid exposing the magnet and reduce the impact and corrosion of the magnet by the material. The wall thickness of the hollow column 7 and the enlarged shell 34 is controlled between 1.5-2.5mm, which ensures structural rigidity and reduces the overall weight of the stirring component 4, facilitating magnetic levitation control. The non-magnetic stainless steel material avoids shielding the axial magnetic field, ensuring stable repulsive force between the axial magnet 32 ​​and the axial response magnet 5, and achieving reliable axial levitation of the stirring component 4.

[0065] In this embodiment, each step is implemented by a magnetic levitation stirring device, which has a frame 1, a controller 2 mounted on the frame 1, an outer barrel 11, and a jacket space formed between the container 3 and the outer barrel 11. The axial magnet 32, the radial annular magnet 13, and the motor stator 15 are all housed in the jacket space. The side wall or / and top wall of the container 3 is provided with a feed inlet 16, and the bottom of the container 3 is provided with a discharge outlet 17. A cover 18 is movably mounted on the outer shell, and an opening and closing assembly 19 is provided between the cover 18 and the outer shell. The opening and closing assembly 19 is used to fix or release the cover 18 on the outer shell. The top of the container 3 is open, and the outer shell has a clearance opening to expose the container 3. The cover 18 is used to open or close the top of the container 3. The cover 18 is provided with a feed inlet 16.

[0066] The overall layout design of this device aims to achieve integrated and automated control of magnetic levitation stirring, while ensuring convenient material loading and unloading and sealing. During implementation, the frame 1 is first fixed to a horizontal ground and tightened with expansion bolts to ensure no shaking during stirring. The outer barrel 11 is bolted to the middle of the frame 1, and the container 3 is hoisted into the outer barrel 11. A 5-10cm gap is left between the two to accommodate the axial magnet 32, the radial annular magnet 13, and the motor stator 15. The gap provides insulation and protection, preventing external interference with the internal magnetic field. The controller 2 is installed in the electrical cabinet at the top of the frame 1 and is connected to the axial magnet 32, the radial annular magnet 13, the motor stator 15, and the opening / closing assembly 19 via cables for centralized control.

[0067] The feed inlet 16 is located on one side of the top wall of the container 3 (5-8 cm away from the rotation axis of the agitator 4), equipped with a quick-opening valve with a sealing ring. During feeding, it connects to an external hopper via a pipe; simply opening the valve allows for feeding. The feeding speed is controlled by a flow pump at 1-2 L / min to avoid impacting the agitator 4. The discharge outlet 17 is located at the bottom center of the container 3, coinciding with the rotation axis of the agitator 4. It is equipped with a pneumatic ball valve. After mixing, the controller 2 sends a signal to open the valve, allowing the material to be discharged under gravity in ≤30 seconds. The cover 18 is connected to the outer shell via a hinge. The opening and closing assembly 19 uses an electromagnetic lock. When maintenance of the agitator 4 or cleaning of the container is required, the controller 2 releases the electromagnetic lock, allowing manual opening of the cover 18. During operation, the electromagnetic lock is locked, ensuring a seal between the cover 18 and the outer shell, preventing material splashing or external impurities from entering. The feed inlet 16 on the cover 18 is aligned with the feed inlet 16 of the container 3, enabling continuous feeding without opening the cover and improving operational efficiency.

[0068] In this embodiment, a support component 12 for supporting the container 3 is provided between the container 3 and the outer barrel 11. The support component 12 is also used to fix the axial magnet 32. An adjustment component 14 is provided on the outer barrel 11. The adjustment component 14 is used to adjust the axial height of the radial annular magnet 13. A non-magnetic stainless steel ring 33 is provided on the outer wall of the container 3. The non-magnetic stainless steel ring 33 is located between the motor stator 15 and the radial annular magnet 13.

[0069] The support assembly 12 is designed to provide stable support for the container 3 and precise positioning of the axial magnet 32. The adjustment assembly 14 is used to adapt to radial suspension requirements under different working conditions, while the non-magnetic stainless steel ring 33 ensures independent and stable magnetic field. In implementation, the support assembly 12 uses 3-4 evenly distributed L-shaped non-magnetic stainless steel supports. One end of the support is fixed to the bottom inner wall of the outer barrel 11 with bolts, and the other end is supported by an arc-shaped support plate to lift the bottom of the container 3. Rubber pads are attached to the contact points between the support plate and the container 3 to enhance friction and buffer vibration. The axial magnet 32 ​​is fixed to the middle crossbeam of the support assembly 12 by a ring clamp. A thin copper sheet is placed between the clamp and the axial magnet 32 ​​to fine-tune the level of the axial magnet 32, ensuring that its coaxiality error with the axial response magnet 5 of the stirring component 4 is ≤0.1mm.

[0070] The adjustment assembly 14 is installed on the side wall of the outer barrel 11, corresponding to the position of the radial annular magnet 13. It adopts a screw jack structure, and the screw is driven up and down by a handwheel or servo motor. The top of the screw is connected to the fixing seat of the radial annular magnet 13. During adjustment, according to the height of the radial response magnet 6 of the stirring component 4, the handwheel is rotated to move the radial annular magnet 13 axially. The adjustment range is 0-5cm, ensuring that the radial annular magnet 13 and the radial response magnet 6 are in the same radial plane, and the radial gap is controlled at 3-5mm. The non-magnetic stainless steel ring 33 (material 316L, thickness 2-3mm, width consistent with the motor stator 15) is fixed to the outer wall of the container 3 by welding, located between the motor stator 15 and the radial annular magnet 13. Its function is to block the mutual interference between the magnetic field generated by the motor stator 15 and the radial annular magnet 13, avoid magnetic loss caused by magnetic field coupling, and prevent the magnetic field of the radial annular magnet 13 from affecting the driving efficiency of the motor stator, ensuring that the magnetic levitation positioning and magnetic drive stirring operate independently and stably.

[0071] In this embodiment, there is a levitation gap between the bottom of the enlarged shell 34 of the stirring component 4 and the bottom wall of the container 3, which allows the stirring component 4 to be magnetically levitated. The bottom of the enlarged shell 34 is provided with an array structure formed by multiple holes 28. The stirring part 9 is disposed on the connecting column. The motor rotor part 8 and the radial response magnet 6 are connected to the connecting column through the stirring part 9. For medium and low viscosity materials, the stirring part 9 is a stirring blade structure. For medium and high viscosity materials, the stirring part 9 is a rod-shaped structure 27 of the first connecting rod and the second connecting rod.

[0072] The suspension gap ensures that the agitator 4 is suspended without contact, the array of holes 28 optimizes material flow, and the structure of the agitator 9 is adapted to achieve efficient mixing of materials with different viscosities. During implementation, the suspension gap is adjusted by the magnetic force of the axial magnet 32, initially set to 5-10mm (adjusted according to the weight of the agitator 4). The gap between the bottom of the enlarged shell 34 and the bottom wall of the container 3 must be uniform. The levelness of the bottom wall of the container 3 is checked using a level to ensure that the gap deviation is ≤0.5mm, preventing the agitator 4 from tilting and touching the container. Multiple φ2-3mm holes 28 are machined on the bottom of the enlarged shell 34, arranged in a ring array (6-8 holes). The function of the holes 28 is to allow material to flow up and down through them during mixing, breaking up the stagnant area at the bottom, balancing the pressure above and below the enlarged shell 34, reducing eddies generated during mixing, and improving mixing uniformity.

[0073] The connection between the stirring section 9 and the connecting column is either welded or threaded. If welded, argon arc welding is used, with a weld height of 3-5mm to ensure connection strength. If threaded, fine threads are used, along with anti-loosening nuts to prevent loosening during high-speed rotation. For medium-low viscosity materials (viscosity ≤1000mPa·s), the stirring section 9 adopts a three-blade stirring structure with a blade inclination angle of 45°, a blade width of 20-30mm, and a thickness of 2-3mm. High-speed rotation (200-500r / min) generates strong shear force to ensure thorough mixing of materials. For medium-high viscosity materials (viscosity 1000-10000mPa·s), the stirring section 9 adopts a rod-shaped structure 27 consisting of a first connecting rod and a second connecting rod, with a rod diameter of 8-12mm and a length of 50-80mm. Low-speed rotation (50-200r / min) generates axial and radial material flow, preventing high-viscosity materials from adhering to the container wall and ensuring effective mixing.

[0074] In this embodiment, two radial annular magnets 13 are provided, located on both sides of the axial direction of the motor stator 15; two corresponding radial response magnets 6 are also provided, located on both sides of the axial direction of the motor rotor 8; the adjustment component 14 is used to adjust the axial height of the two radial annular magnets 13 respectively; or, the number of motor stator 15 and motor rotor 8 are both set to two, with the corresponding radial annular magnet located in the middle of the two motor stator 15 and the corresponding radial response magnet 6 located between the two motor rotor 8.

[0075] The two layout designs aim to enhance radial levitation stability and magnetic drive efficiency through structural optimization, adapting to different stirring power requirements. In the first layout, two radial annular magnets 13 are fixed to the axial sides (above and below) of the motor stator 15 via brackets, with a spacing of 1.5-2 times the height of the motor stator 15. Two corresponding radial response magnets 6 are fixed to the axial sides of the motor rotor 8 via connecting rods, corresponding one-to-one with the radial annular magnets 13. The adjustment assembly 14 adopts a double lead screw structure, connecting to the fixing seats of the two radial annular magnets 13 respectively. By independently adjusting the height of each lead screw, the magnetic field centers of the two radial annular magnets 13 are aligned with the centers of the corresponding radial response magnets 6. The radial levitation force acts simultaneously from both above and below on the stirring component 4, reducing radial movement of the stirring component 4 during high-speed rotation, with the radial offset controlled within ±0.3mm.

[0076] In the second layout, two motor stators 15 are fixed vertically and horizontally within the jacket space of the outer barrel 11 via annular brackets, with a spacing of 2-3 times the height of the motor stators 15. The corresponding two motor rotors 8 are fixed to the connecting columns of the stirring component 4 via connecting rods, corresponding one-to-one with the motor stators 15. A radial annular magnet is mounted on the bracket between the two motor stators 15, and a radial response magnet 6 is mounted between the two motor rotors 8, radially aligned with the radial annular magnet. This layout allows the two motor stators 15 to simultaneously drive the two motor rotors 8, increasing the driving torque (50-100% higher than a single stator structure), making it suitable for high-power stirring scenarios (stirring power ≥ 1.5kW). The radial annular magnet, located in the middle, provides radial guiding force to both motor rotors 8 simultaneously, simplifying the structure while ensuring radial suspension stability. The adjustment component 14 adjusts the height of the radial annular magnet to adapt to different installation positions of the stirring component 4, ensuring optimal magnetic field coupling.

[0077] The integrated layout and basic working principle of the device of this invention: The stable operation of magnetic levitation stirring relies on the integrated layout of the device and the precise cooperation of each component. Its overall design revolves around three core aspects: "structural support - magnetic field isolation - material flow", providing a reliable foundation for subsequent magnetic levitation positioning and magnetic drive stirring. The device uses the frame 1 as the load-bearing core, which is fixed to the horizontal ground by expansion bolts to ensure no vibration interference during the stirring process. The outer barrel 11 is installed in the middle of the frame 1 by bolts, and the container 3 is suspended in the outer barrel 11. A 5-10cm jacket space is reserved between the two. This space not only provides a closed installation environment for the axial magnet 32, the radial annular magnet 13, and the motor stator 15, but also plays a role in heat insulation and dust protection, avoiding the influence of the external environment on the stability of the magnetic field.

[0078] The support assembly 12 between the container 3 and the outer barrel 11 consists of 3-4 evenly distributed L-shaped non-magnetic stainless steel brackets. One end is fixed to the inner wall of the outer barrel 11, and the other end is supported by an arc-shaped support plate with a rubber pad, ensuring the container is securely fixed and buffering the stirring vibration. Meanwhile, the axial magnet 32 ​​is fixed to the middle crossbeam of the support assembly 12 by a ring clamp. The thin copper sheet between the clamp and the magnet can be finely adjusted for levelness, ensuring that the coaxiality error between the magnet and the axial response magnet 5 of the stirring component 4 is ≤0.1mm. The adjustment assembly 14 on the side wall of the outer barrel 11 adopts a screw jack structure, which can drive the radial ring magnet 13 to move axially within a range of 0-5cm, ensuring that it is precisely aligned with the radial response magnet 6 of the stirring component 4. The non-magnetic stainless steel ring 33 on the outer wall of the container 3 blocks the magnetic field coupling between the motor stator 15 and the radial ring magnet 13, avoiding magnetic loss.

[0079] In terms of material flow, the feed inlet 16 is located on the top or side wall of the container 3 and is equipped with a quick-opening valve with a sealing ring. The feeding speed is controlled at 0.5-2L / min to avoid impacting the agitator 4. The discharge outlet 17 is located at the center of the bottom wall of the container and coincides with the rotation axis of the agitator 4. It is equipped with a pneumatic ball valve to achieve rapid discharge. The cover 18 is fixed by an electromagnetic locking opening and closing assembly 19, which not only ensures sealing and splash prevention but also supports continuous feeding without opening the cover. The overall layout achieves the coordinated unity of structural support, magnetic field isolation and material flow.

[0080] The core mechanism and dynamic adjustment principle of magnetic levitation positioning in this invention: Magnetic levitation positioning is the key to achieving contactless stirring. Its working principle is based on the dual magnetic control mechanism of "axial repulsive suspension + radial repulsive guidance". Through precise magnetic field adjustment and real-time feedback, it ensures that the stirring component 4 is stably suspended and contactless.

[0081] Axial levitation is achieved by the cooperation of an axial magnet 32 ​​located below the container 3 and an axial response magnet 5 of the stirring element 4. The axial magnet 32 ​​can be a neodymium iron boron permanent magnet (magnetic field strength 1000-2000Gs) or a ring electromagnet. The permanent magnet maintains a 2-20mm levitation gap between the stirring element 4 and the bottom wall of the container through a fixed repulsive force. A gap of 5-20mm is suitable for powder materials and a gap of 2-10mm is suitable for liquid materials. The electromagnet is connected to an adjustable DC power supply and a PID controller 2. With the help of a distance sensor with an accuracy of ±0.1mm, the current is adjusted in real time to keep the gap stable within the set range and avoid contact wear.

[0082] Radial levitation relies on a radial annular magnet 13 circumferentially mounted on the container. This magnet consists of a non-magnetic aluminum alloy annular fixing ring 21, 6-8 evenly distributed protrusions 22, and a coil unit 23. The protrusions 22 maintain a 3-5mm gap with the outer wall of the container. The coil unit 23 is wound with 50-100 turns of φ0.5-1.0mm enameled copper wire and generates a radial magnetic field by outputting an adjustable current of 0.5-5A through a programmable DC power supply.

[0083] During the stirring process, the infrared displacement sensor monitors the radial offset of the stirring component 4 in real time. The controller 2 increases the repulsive force on the offset side by adjusting the coil current of the corresponding protrusion 22, thus controlling the radial offset within ±0.5mm. To adapt to changes in the material level, the ultrasonic level sensor (accuracy ±0.1cm) on the top wall of the container 3 collects the liquid level data in real time. According to the preset "liquid level-suspension height" correspondence (e.g., for every 1cm increase in liquid level, the suspension height is increased by 0.8-1cm), the controller 2 dynamically adjusts the suspension height of the stirring component 4 within the range of 0.5-3cm by adjusting the current of the axial magnet 32 ​​or the permanent magnet setting, ensuring that the stirring part 9 is always immersed in the material by 2-5cm, avoiding "dry stirring" or insufficient stirring, and achieving dual protection of static positioning and dynamic adaptation.

[0084] The working principle of the magnetic drive stirring and adaptation optimization of this invention: Magnetic drive stirring transmits power through magnetic field coupling. Combined with structural optimization and working condition adaptation design, it achieves efficient and stable stirring of different materials, while ensuring long-term reliable operation of the equipment. The core of magnetic drive is the cooperation between the motor stator 15 and the motor rotor 8 of the stirring component 4: The motor stator 15 is supplied with three-phase alternating current to generate a rotating magnetic field, maintaining a radial gap of 5-10mm with the motor rotor 8. Through magnetic field coupling, the rotor is driven to rotate synchronously, driving the stirring component 9 to operate at a speed of 50-500r / min. No mechanical shaft connection is required, fundamentally avoiding shaft seal leakage and material contamination.

[0085] The stirring section 9 adopts a working condition adaptability design: for medium and low viscosity materials (≤1000mPa·s), a three-blade stirring blade structure (blade tilted at 45°, width 20-30mm) is selected, and strong shearing force is generated by high-speed rotation of 200-500r / min to achieve uniform mixing; for medium and high viscosity materials (1000-10000mPa·s), a rod-shaped structure 27 composed of the first and second connecting rods (rod diameter 8-12mm, length 50-80mm) is adopted, and the material is driven to flow axially and radially by low-speed rotation of 50-200r / min to avoid adhesion to the container wall.

[0086] The structural design of the mixing component 4 further optimizes the mixing effect: the hollow column 7 is filled with polyurethane foam material (density 0.3-0.5 g / cm³). 3To achieve lightweight design, the total weight is controlled between 0.5-2kg, reducing the energy consumption of magnetic levitation. The annular array of holes 28 (φ2-3mm, 6-8 holes) in the enlarged bottom shell 34 promotes the upward and downward flow of materials, breaks up the bottom stagnation zone, balances pressure, and reduces eddies. To stabilize the magnetic field strength, a cooling system is activated during stirring: air cooling is achieved by accelerating airflow through 4-6 axial fans (wind speed 3-5m / s), and water cooling is achieved by removing heat through a spiral water cooling jacket (cooling water temperature 20-30℃, flow rate 5-10L / min). The combined cooling can quickly control the temperature outside the container at 25-40℃, avoiding magnetic force attenuation and coil overheating.

[0087] In addition, the dual-layout design of the radial annular magnet 13 and the motor stator 15 is adapted to different power requirements: the two radial magnets are placed on both sides of the motor stator to improve radial suspension stability; the two stators are placed on both sides of the radial magnets to increase the driving torque by 50-100%, which is suitable for high-power scenarios of ≥1.5kW. Overall, it realizes comprehensive optimization of power transmission, working condition adaptation and equipment protection.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for magnetic levitation stirring of materials, characterized in that, Includes the following steps: S1 Material and stirring component (4) preparation: Add the material to be stirred into the container (3), the container (3) is equipped with a magnetically levitated stirring component (4); the stirring component (4) is equipped with an axial response magnet (5), a radial response magnet (6), a motor rotor (8) and a stirring part (9); S2 Magnetic levitation positioning: The stirring component (4) is axially levitated by the magnetic repulsion between the axial magnet (32) below the container (3) and the axial response magnet (5) of the stirring component (4); the stirring component (4) is radially levitated by the magnetic repulsion between the radial ring magnet (13) on the periphery of the container (3) and the radial response magnet (6) of the stirring component (4); S3 Magnetic driving stirring: The stirring component (4) is driven to rotate around the rotation axis by the cooperation between the motor stator (15) on the periphery of the container (3) and the corresponding motor rotor (8) of the stirring component (4), and the material in the container (3) is magnetically levitated and stirred by the stirring part (9).

2. The magnetic levitation stirring method for materials according to claim 1, characterized in that: In S1, the axial response magnet (5), radial response magnet (6), and motor rotor (8) of the stirring component (4) all include a permanent magnet ring (24), a silicon steel sheet ring (25) that cooperates with the permanent magnet ring (24), and a non-magnetic material (26) that isolates the permanent magnet ring (24) and the silicon steel sheet ring (25). The permanent magnet ring (24), the silicon steel sheet ring (25), and the non-magnetic material (26) constitute a composite structure, and the outside of the composite structure is covered with a non-magnetic protective layer.

3. The magnetic levitation stirring method for materials according to claim 1, characterized in that: The non-magnetic protective layer is welded onto the outside of the composite structure using a cold welding process at a temperature of 180-280℃. The non-magnetic protective layer is made of non-magnetic stainless steel.

4. The magnetic levitation stirring method for materials according to claim 1, characterized in that: In S2, the radial annular magnet (13) includes an annular fixing ring (21) surrounding the container (3), a plurality of protrusions (22) disposed on the annular fixing ring (21), and a plurality of coil units (23) disposed on the plurality of protrusions (22). The protrusions (22) are located between the annular fixing ring (21) and the container (3). The magnetic field strength of the radial annular magnet (13) is adjusted by the magnitude of the current of the coil units (23).

5. The magnetic levitation stirring method for materials according to claim 1, characterized in that: In S2, the axial magnet (32) is a permanent magnet or an electromagnet; when the axial magnet (32) is an electromagnet, the magnetic field strength of the axial magnet (32) is adjusted by changing the current to maintain the suspension gap between the stirring piece (4) and the bottom wall of the container (3) at 2-20mm.

6. A magnetic levitation stirring method for materials according to claim 5, characterized in that: During the S3 stirring process, the liquid level sensor is used to monitor the changes in the liquid level of the material in the container (3). The strength of the axial magnet (32) is changed by adjusting the current of the axial magnet (32) generating unit, so that the suspension height of the stirring part (4) is dynamically adjusted with the liquid level. The adjustment range is 0.5-3cm, ensuring that the stirring part (9) is always in the effective stirring area of ​​the material.

7. The magnetic levitation stirring method for materials according to claim 1, characterized in that: In S3, a cooling component (35) is configured around the container (3). The cooling component (35) around the container (3) is activated, and the cooling component (35) is used to achieve cooling operation. The temperature outside the container (3) is controlled within a preset range by air cooling and / or water cooling to stabilize the strength of each magnetic field.

8. A magnetic levitation stirring method for materials according to claim 1, characterized in that: In S1, a feed inlet (16) is provided on the upper side wall or top wall of the container (3) to inject material into the container (3); a discharge outlet (17) is provided on the bottom wall of the container (3), the central axis of the discharge outlet (17) coincides with the rotation axis of the stirring component (4), and the axial response magnet (5) and axial magnet (32) are arranged around the discharge outlet (17) to discharge the stirred material in the container (3).

9. A magnetic levitation stirring method for materials according to claim 2, characterized in that: The stirring component (4) has a hollow column (7), a foamed material body filled in the hollow column (7), a connecting block located in the hollow column (7), a first connecting rod connecting the connecting block and the radial response magnet (6), and a second connecting rod connecting the connecting block and the motor rotor (8). The stirring part (9) is located in the hollow column (7), the connecting rod, the radial response magnet (6) or the motor rotor (8).

10. A magnetic levitation stirring method for materials according to claim 9, characterized in that: An enlarged housing (34) is set at the bottom of the hollow column (7), and an axial response magnet (5) is installed inside the enlarged housing (34). The axial response magnet (5) is arranged around the hollow column (7). The hollow column (7) and the enlarged housing (34) are both made of non-magnetic stainless steel by cold welding process. The wall thickness of the hollow column (7) and the enlarged housing (34) is 1.5mm-2.5mm.

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