Special adhesive tape for sintering neodymium-iron-boron grain boundary diffusion and its preparation device
By combining special adhesive tape and preparation equipment, the problems of large usage and uneven mixing of heavy rare earth alloy powder in the grain boundary diffusion of sintered NdFeB have been solved, achieving uniform laying of diffusion source and improvement of mixing efficiency, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI UNIV OF SCI & TECH
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, the sintering process of NdFeB grain boundary diffusion requires the use of a large amount of heavy rare earth alloy powder, resulting in high costs and low utilization efficiency of heavy rare earth resources. At the same time, traditional stirring and mixing devices are difficult to achieve uniform mixing of slurry, which affects processing efficiency.
Special adhesive tape is used, including a base layer, an adhesive layer, and a protective backing paper. The adhesive layer is composed of rare earth alloy powder and pressure-sensitive adhesive. Combined with a special preparation device, the rare earth alloy powder and pressure-sensitive adhesive are uniformly mixed by using quantitative discharge, guiding and uniform distribution components. The stirring blades in the preparation tank ensure thorough mixing and achieve uniform laying of the diffusion source.
This method achieves uniform mixing of rare earth alloy powder and pressure-sensitive adhesive, improves the consistency of diffusion effect, reduces production costs, enhances mixing efficiency, and avoids the problem of uneven distribution of diffusion sources.
Smart Images
Figure CN224304520U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of special adhesive tape technology, specifically to a special adhesive tape for grain boundary diffusion in sintered NdFeB and its preparation apparatus. Background Technology
[0002] Sintered neodymium iron boron (NdFeB) permanent magnets are widely used in high-performance fields such as new energy vehicle drive motors, wind power generation, industrial automation, and consumer electronics due to their excellent magnetic properties, including high remanence, high coercivity, and high energy product. In existing technologies, grain boundary diffusion typically involves preparing a slurry of heavy rare earth materials (alloys or compound powders), spraying or coating it onto the magnet surface, and then subjecting it to high-temperature diffusion heat treatment.
[0003] Traditional methods require the use of large quantities of heavy rare earth alloy powder, increasing costs and reducing the utilization efficiency of heavy rare earth resources. Furthermore, traditional mixing devices struggle to quickly and uniformly mix the slurry during preparation, impacting processing efficiency.
[0004] To address this, a special adhesive tape for grain boundary diffusion in sintered NdFeB and its preparation apparatus are proposed. Utility Model Content
[0005] The purpose of this invention is to provide a special adhesive tape for grain boundary diffusion in sintered NdFeB magnets and its preparation apparatus in order to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:
[0007] A special adhesive tape for grain boundary diffusion in sintered NdFeB magnets includes a base layer, an adhesive layer, and a backing paper protective film, wherein the base layer, the adhesive layer, and the backing paper protective film are bonded to each other, and the adhesive layer includes rare earth alloy powder and pressure-sensitive adhesive.
[0008] A preparation apparatus for preparing the above-mentioned special adhesive cloth for sintering NdFeB grain boundary diffusion includes a preparation barrel, a support frame fixedly connected to the top of the preparation barrel, a mixing component installed at the bottom of the preparation barrel, a metering discharge component fixedly installed on the top of the support frame, a guiding component disposed below the metering discharge component, a uniform distribution component for adjusting the position of the guiding component disposed on the surface of the metering discharge component, and a discharge valve fixedly inserted into the bottom of the preparation barrel.
[0009] Furthermore, the mixing component includes a first motor, which is fixedly installed at the bottom of the preparation tank. The output end of the first motor is fixedly connected to a first rotating shaft, and stirring blades are fixedly connected to the surface of the first rotating shaft.
[0010] Furthermore, the quantitative discharge component includes a support plate, which is fixedly connected to a support frame. The support plate has a circular structure, and a weighing sensor is fixedly installed on the top surface of the support plate. A storage bin is fixedly connected to the detection end of the weighing sensor, and a solenoid valve is fixedly installed in the middle of the bottom surface of the storage bin.
[0011] Furthermore, the material guiding assembly includes a guide cylinder, which is rotatably connected to the center of the bottom surface of the support plate. A slide is fixedly connected to the bottom of the guide cylinder, and a material dispensing box is fixedly connected to the end of the slide. A guide hole is provided through the bottom surface of the material dispensing box.
[0012] Furthermore, the uniform distribution component includes a second motor, which is fixedly mounted on the top surface of the support plate. The output end of the second motor is fixedly connected to a second rotating shaft, and the end of the second rotating shaft is fixedly connected to a drive gear. A toothed ring is fixedly sleeved on the surface of the guide tube, and the toothed ring meshes with the drive gear.
[0013] The beneficial effects of this utility model are as follows:
[0014] 1. The special adhesive tape of this utility model is made by uniformly mixing rare earth alloy powder with pressure-sensitive adhesive to form an adhesive layer, which can achieve uniform and controllable laying of diffusion source, avoiding the problem of uneven distribution of diffusion source in traditional spraying or coating process, thereby improving the consistency of diffusion effect inside magnet, enhancing magnetic performance, reducing the amount of slurry used, and reducing production cost.
[0015] 2. In this invention, the pressure-sensitive adhesive is placed inside the preparation tank, and the rare earth alloy powder is stored inside the quantitative dispensing component. The quantitative dispensing component can be used for quantitative dispensing, and the powder can be sent into the preparation tank through the guiding component. At the same time, the operation of the uniform distribution component can control the rotation of the guiding component to achieve uniformly and circularly dispensing of powder. With the operation of the mixing component, the mixture can be fully and uniformly mixed. In use, this invention achieves the goal of facilitating the full and uniform mixing of rare earth alloy powder and pressure-sensitive adhesive, thus improving the mixing efficiency. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the adhesive tape structure of this utility model;
[0017] Figure 2 This is a schematic diagram of the preparation device of this utility model;
[0018] Figure 3 This is a utility model Figure 2 A cross-sectional view of the structure;
[0019] Figure 4 This is a utility model Figure 2 Schematic diagram of the central storage hopper structure;
[0020] Figure 5 This is a utility model Figure 2 Schematic diagram of a local structure in the middle;
[0021] Figure 6 This is a utility model Figure 2 Bottom view of the central support structure;
[0022] Reference numerals: 1. Preparation tank; 2. Mixing component; 201. First motor; 202. First rotating shaft; 203. Stirring blade; 3. Support frame; 4. Quantitative discharge component; 401. Storage tank; 402. Solenoid valve; 403. Support plate; 404. Weighing sensor; 5. Material guiding component; 501. Guide tube; 502. Slide rail; 503. Spreading box; 504. Guide hole; 6. Uniform distribution component; 601. Second motor; 602. Second rotating shaft; 603. Drive gear; 604. Gear ring; 7. Discharge valve; 8. Base layer; 9. Adhesive layer; 10. Backing paper protective film. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.
[0027] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0028] like Figures 1 to 6 As shown, a special adhesive tape for grain boundary diffusion in sintered NdFeB magnets includes a base layer 8, an adhesive layer 9, and a protective backing film 10. The base layer 8, adhesive layer 9, and protective backing film 10 are bonded together. The adhesive layer 9 comprises rare earth alloy powder and pressure-sensitive adhesive. More specifically, in use, the three-layer adhesive tape is cut to a suitable size, the protective backing film 10 is removed, and then it is attached to the surface of the sintered NdFeB magnet. Subsequently, the magnet with the adhesive tape attached undergoes grain boundary diffusion heat treatment.
[0029] A preparation apparatus for preparing the aforementioned special adhesive cloth for sintering NdFeB grain boundary diffusion includes a preparation tank 1. A support frame 3 is fixedly connected to the top of the preparation tank 1. A mixing component 2 is installed at the bottom of the preparation tank 1. A metering discharge component 4 is fixedly installed on the top of the support frame 3. A guiding component 5 is disposed below the metering discharge component 4. A uniform distribution component 6 for adjusting the position of the guiding component 5 is disposed on the surface of the metering discharge component 4. A discharge valve 7 is fixedly inserted into the bottom of the preparation tank 1. It should be noted that the pressure-sensitive adhesive is placed inside the preparation tank 1, and the rare earth alloy powder is stored inside the metering discharge component 4. The metering discharge component 4 allows for metered dispensing, and the guiding component 5 delivers the powder into the preparation tank 1. Simultaneously, the operation of the uniform distribution component 6 controls the rotation of the guiding component 5, achieving uniformly scattering of the powder in a ring. Combined with the operation of the mixing component 2, the mixture is thoroughly and uniformly mixed.
[0030] The mixing component 2 includes a first motor 201, which is fixedly installed at the bottom of the preparation tank 1. The output end of the first motor 201 is fixedly connected to a first rotating shaft 202, and a stirring blade 203 is fixedly connected to the surface of the first rotating shaft 202. More specifically, the operation of the first motor 201 drives the first rotating shaft 202 to rotate, which in turn drives the stirring blade 203 to rotate, thereby fully stirring the mixture inside the preparation tank 1.
[0031] The quantitative dispensing component 4 includes a support plate 403, which is fixedly connected to the support frame 3. The support plate 403 has a circular structure, and a weighing sensor 404 is fixedly installed on the top surface of the support plate 403. The detection end of the weighing sensor 404 is fixedly connected to a storage bin 401, and a solenoid valve 402 is fixedly installed in the middle of the bottom surface of the storage bin 401. It should be noted that rare earth alloy powder can be stored in the storage bin 401, and the rare earth alloy powder can be conveyed downward by the solenoid valve 402. The weighing sensor 404 can monitor the weight change of the storage bin 401. When the detected weight change reaches a preset value, the solenoid valve 402 immediately closes, thereby realizing quantitative dispensing. The feedback control of the solenoid valve 402 by the weighing sensor 404 can be achieved by conventional equipment such as a PLC controller, which is a mature existing technology in this field and will not be described in detail here.
[0032] The material guiding component 5 includes a guide cylinder 501, which is rotatably connected to the center of the bottom surface of the support plate 403. A slide 502 is fixedly connected to the bottom of the guide cylinder 501, and a material dispensing box 503 is fixedly connected to the end of the slide 502. A guide hole 504 is provided through the bottom surface of the material dispensing box 503. More specifically, the rare earth alloy powder discharged by the quantitative discharge component 4 can be fed into the slide 502 through the guide cylinder 501, and the rare earth alloy powder can be fed into the material dispensing box 503 through the inclined slide 502. Then, the rare earth alloy powder can be evenly fed into the interior of the preparation barrel 1 through the guide hole 504.
[0033] The distribution assembly 6 includes a second motor 601, which is fixedly mounted on the top surface of the support plate 403. A second rotating shaft 602 is fixedly connected to the output end of the second motor 601, and a drive gear 603 is fixedly connected to the end of the second rotating shaft 602. A gear ring 604 is fixedly fitted onto the surface of the guide tube 501, and the gear ring 604 meshes with the drive gear 603. It should be noted that the operation of the second motor 601 drives the second rotating shaft 602 to rotate, thereby driving the drive gear 603 to rotate. The drive gear 603 then drives the meshing gear ring 604 to rotate, thus controlling the rotation of the guide tube 501.
[0034] In summary, this utility model's special adhesive tape, by uniformly mixing rare earth alloy powder and pressure-sensitive adhesive to form an adhesive layer, enables the uniform and controllable laying of the diffusion source, avoiding the problem of uneven diffusion source distribution in traditional spraying or coating processes. This improves the consistency of the diffusion effect inside the magnet, enhances the magnetic performance, and reduces the amount of slurry used, thus lowering production costs. In this utility model, the pressure-sensitive adhesive is placed inside the preparation tank 1, and the rare earth alloy powder is stored inside the quantitative dispensing component 4. The quantitative dispensing component 4 allows for quantitative dispensing, and the powder is fed into the preparation tank 1 via the guiding component 5. Simultaneously, the operation of the uniform distribution component 6 controls the rotation of the guiding component 5, achieving uniformly and circularly dispensing of the powder. Combined with the operation of the mixing component 2, the mixture is thoroughly and uniformly mixed. In use, this achieves the goal of easily and uniformly mixing rare earth alloy powder and pressure-sensitive adhesive, improving mixing efficiency.
[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A special adhesive tape for grain boundary diffusion in sintered NdFeB magnets, characterized in that, It includes a base layer (8), an adhesive layer (9) and a backing paper protective film (10), wherein the base layer (8), the adhesive layer (9) and the backing paper protective film (10) are bonded to each other, and the adhesive layer (9) includes rare earth alloy powder and pressure-sensitive adhesive.
2. A preparation apparatus for preparing the special adhesive tape for grain boundary diffusion of sintered NdFeB as described in claim 1, characterized in that, The equipment includes a preparation tank (1), a support frame (3) is fixedly connected to the top of the preparation tank (1), a mixing component (2) is installed at the bottom of the preparation tank (1), a quantitative discharge component (4) is fixedly installed at the top of the support frame (3), a guide component (5) is provided below the quantitative discharge component (4), a uniform distribution component (6) for adjusting the position of the guide component (5) is provided on the surface of the quantitative discharge component (4), and a discharge valve (7) is fixedly inserted into the bottom of the preparation tank (1).
3. The preparation apparatus according to claim 2, characterized in that, The mixing component (2) includes a first motor (201), and the first motor (201) is fixedly installed at the bottom of the preparation tank (1). The output end of the first motor (201) is fixedly connected to a first rotating shaft (202), and a stirring blade (203) is fixedly connected to the surface of the first rotating shaft (202).
4. The preparation apparatus according to claim 2, characterized in that, The quantitative discharge component (4) includes a support plate (403), and the support plate (403) is fixedly connected to the support frame (3). The support plate (403) is a ring-shaped structure. A weighing sensor (404) is fixedly installed on the top surface of the support plate (403). A storage bin (401) is fixedly connected to the detection end of the weighing sensor (404). A solenoid valve (402) is fixedly installed in the middle of the bottom surface of the storage bin (401).
5. The preparation apparatus according to claim 4, characterized in that, The material guiding assembly (5) includes a guide cylinder (501), and the guide cylinder (501) is rotatably connected to the middle of the bottom surface of the support plate (403). A slide (502) is fixedly connected to the bottom of the guide cylinder (501), and a material spreading box (503) is fixedly connected to the end of the slide (502). A guide hole (504) is opened through the bottom surface of the material spreading box (503).
6. The preparation apparatus according to claim 5, characterized in that, The uniform distribution component (6) includes a second motor (601), which is fixedly mounted on the top surface of the support plate (403). The output end of the second motor (601) is fixedly connected to a second rotating shaft (602), and the end of the second rotating shaft (602) is fixedly connected to a drive gear (603). A toothed ring (604) is fixedly sleeved on the surface of the guide tube (501), and the toothed ring (604) meshes with the drive gear (603).