Rotary diffusion device for vacuum sintering furnace

Abstract

The invention discloses a rotary diffusion device for a vacuum sintering furnace, and belongs to the technical field of manufacturing processes of neodymium-iron-boron magnets, the rotary diffusion device comprises an atomization unit, a collection unit and a frame body which are placed in the vacuum sintering furnace, the atomization unit is used for atomizing heavy rare earth element slurry, and the collection unit is used for collecting the heavy rare earth element slurry. The collecting unit is used for recycling atomized heavy rare earth element slurry, driving motors are oppositely arranged at the two ends of the frame body, mounting bases are coaxially arranged at the output ends of the driving motors, bases are arranged on the mounting bases, annular grooves coaxial with the bases are formed in the circumferential sides of the bases, a plurality of clamping structures are arranged in the annular grooves, and the clamping structures are arranged in the annular grooves. The clamping structure comprises a support connected into the annular groove in a sliding mode, and a locking pin is detachably connected between the support and the annular groove. The method aims at solving the problem that when a magnet with a complex shape or a special shape is treated, it can not be guaranteed that all the surfaces are evenly covered with heavy rare earth elements through single-face coating, and therefore the diffusion effect is affected.

Description

Technical Field

[0001] The invention belongs to the technical field of manufacturing process of NdFeB magnets, and in particular relates to a rotary diffusion device used in a vacuum sintering furnace. Background Art

[0002] NdFeB magnets are widely used in various high-tech fields due to their excellent magnetic properties, such as electric vehicles, wind turbines and household appliances. However, in order to improve the anti-demagnetization performance of NdFeB magnets, heavy rare earth elements (such as dysprosium, terbium, etc.) are usually coated on the surface of the magnets and diffused into the interior of the magnets through high temperature.

[0003] In the prior art, the process of grain boundary diffusion generally includes the following steps: first, the sintered NdFeB magnet is sliced ​​to make a diffusion matrix. Then, heavy rare earth elements are coated on the surface of the diffusion matrix by screen printing to form a uniform heavy rare earth element film layer on the magnet surface. Next, the diffusion matrix with the heavy rare earth element film layer is placed in a vacuum sintering furnace for high-temperature heat treatment and diffusion, so that the heavy rare earth elements enter the grain boundary region of the magnet through thermal diffusion, thereby enhancing the magnetic properties of the magnet, especially improving the anti-demagnetization ability and temperature resistance of the magnet.

[0004] However, screen printing technology mainly targets single-sided coating, which may result in uneven distribution of coating on the magnet surface. Especially when dealing with complex or special-shaped magnets, single-sided coating may not ensure that all surfaces are evenly covered with heavy rare earth elements, thus affecting the diffusion effect. Summary of the invention

[0005] In view of this, the present invention discloses a rotary diffusion device for a vacuum sintering furnace, which aims to solve the problem that when processing complex-shaped or special-shaped magnets, single-sided coating may not ensure that all surfaces are evenly covered with heavy rare earth elements, thereby affecting the diffusion effect.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A rotary diffusion device for a vacuum sintering furnace comprises an atomizing unit, a collecting unit and a frame placed in the vacuum sintering furnace, the atomizing unit being used for atomizing heavy rare earth element slurry, the collecting unit being used for recovering the atomized heavy rare earth element slurry, drive motors being arranged opposite to each other at two ends of the frame, a mounting seat being coaxially arranged on the output end of the drive motor, a base being arranged on the mounting seat, a coaxial annular groove being opened on the circumference of the base, a plurality of groups of clamping structures being arranged in the annular groove, the clamping structure comprising a support slidably connected in the annular groove, a locking pin being detachably connected between the support and the annular groove, two fixed shafts perpendicular to the mounting seat being fixed on the support, clamping arms being coaxially slidably connected to the ends of the fixed shafts, telescopic rods being arranged between the fixed shaft and the clamping arms, and tightening columns being arranged at the ends of the clamping arms being parallel to the mounting seat.

[0008] In this solution, the magnet is placed above the frame, and the clamping point is adjusted by sliding the support, and then the locking pin is installed to fix the support; by controlling the telescopic rod to shorten, the telescopic rod drives the clamping column to move toward the magnet until the clamping column and the magnet are against each other, thereby forming a multi-point clamping of both ends of the magnet; then the atomization unit atomizes the heavy rare earth element slurry, and drives the magnet to rotate in the atomized slurry by driving the motor, the mounting seat, and the base. During the rotation process, by controlling one of the corresponding telescopic rods on the support to extend, the clamping column is driven to temporarily detach from the magnet. After multiple rotations, the telescopic rod is controlled to shorten, driving the corresponding clamping column to resume clamping the magnet, and at the same time, the other telescopic rod is controlled to extend, so as to control the clamping column to alternately clamp the magnet, thereby preventing the contact surface between the clamping column and the magnet from being coated with slurry.

[0009] The beneficial effects of this solution are:

[0010] 1. The heavy rare earth element slurry is atomized and distributed in the sintering furnace through an atomizing unit, and then a rotating diffusion device is used to drive the magnet to continuously rotate in the atomized slurry so that the atomized slurry covers the magnet. The subsequent rotation of the magnet makes the slurry evenly diffuse on the surface of the magnet; the continuous rotation of the magnet forms multiple repeated coatings on the magnet; compared with a single coating, the present application can better control the thickness and uniformity of the coating through multiple repeated coatings, thereby achieving the technical effect of evenly covering the heavy rare earth elements on the magnet.

[0011] 2. In addition, compared with one-time coating, multiple layer-by-layer coating and diffusion can make up for the defects in the previous coating, avoid the diffusion unevenness caused by uneven thickness of a single coating, and ensure that the overall coating is more uniform on the magnet surface.

[0012] 3. Recycling excess slurry through the collection unit for secondary coating can effectively reduce material waste and improve the utilization rate of coatings. This not only reduces production costs, but also reduces the impact on the environment.

[0013] 4. Compared with one-time coating, the penetration depth and diffusion speed of the elements can be controlled by adjusting the number of coatings and the rotation rate of the magnet, making the diffusion of heavy rare earth elements on the magnet surface more controllable, thereby optimizing the performance of the magnet.

[0014] 5. Multiple coating and diffusion can ensure that the heavy rare earth elements penetrate into all parts of the magnet more evenly, thereby improving the magnet's anti-demagnetization ability and overall magnetic properties, especially in high-demand application scenarios.

[0015] 6. Since the thickness of each coating is thin, the adhesion between the coating and the magnet surface is stronger, reducing the risk of coating peeling during heat treatment, thereby improving the stability of the coating.

[0016] Furthermore, an adjustment structure is provided between the mounting seat and the base, and the adjustment structure includes a guide rail fitted with the end face of the mounting seat, and a plurality of slide grooves parallel to each other are provided on the end face of the mounting seat facing the base, and the slide grooves are perpendicular to the guide rails, and an adjustment seat is slidably connected in the slide grooves, and a positioning pin is provided between the adjustment seat and the slide grooves, and the adjustment seat is fixedly connected to adjacent guide rails; a deflection seat is slidably connected to the guide rails, and the same positioning pin is also provided between the deflection seat and the guide rails, and a support rod fixedly connected to the base is connected by a ball joint on the deflection seat, and the support rod is a telescopic structure, and a locking structure for limiting the telescopic and deflection of the support rod is provided on the deflection seat.

[0017] In this solution, when the bases at both ends are concentric with the mounting seat, the rotation center of the magnet is in the same straight line as the rotation center of the mounting seat; after the clamping structure clamps the magnet, the restriction of the locking structure on the support rod is released, and the positioning pin is removed. The position of the base on the mounting seat is adjusted by sliding the adjustment seat and the deflection seat, thereby adjusting the rotation center of the magnet, so that the magnet can contact the slurry more evenly.

[0018] Furthermore, the locking structure includes a plurality of circumferentially distributed diagonal support rods, the diagonal support rods are ball-jointedly connected to the deflection seat, the ends of the diagonal support rods are coaxially slidably connected to adjustment rods, the ends of the adjustment rods are ball-jointedly connected to the side walls of the telescopic ends of the support rods, and the diagonal support rods and the adjustment rods are detachably connected with limit pins.

[0019] Furthermore, reinforcing ribs are provided between both ends of the adjustment seat and the guide rails.

[0020] Furthermore, clamping plates that fit with the guide rails are provided on both sides of the deflection seat.

[0021] Furthermore, a motor cover for shielding the drive motor is provided on the drive motor.

[0022] Furthermore, a plurality of protrusions are provided at both ends of the bottom of the frame.

[0023] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0026] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0027] Figure 3 It is a longitudinal cross-sectional view of the fixed shaft in the embodiment of the present invention.

[0028] The markings in the accompanying drawings are as follows: frame 1, atomization unit 2, collection unit 3, drive motor 4, mounting seat 5, base 6, support 7, fixed shaft 8, clamping arm 9, tightening column 10, telescopic rod 11, guide rail 12, adjustment seat 13, deflection seat 14, support rod 15, diagonal support rod 16, fixed rod 17, reinforcing rib 18, clamping plate 19, motor cover 20, protrusion 21. DETAILED DESCRIPTION

[0029] like Figures 1 to 3 As shown:

[0030] A rotary diffusion device for a vacuum sintering furnace comprises an atomizing unit 2, a collecting unit 3 and a frame 1 placed in the vacuum sintering furnace, wherein the atomizing unit 2 is used to atomize a heavy rare earth element slurry, and the collecting unit 3 is used to recover the atomized heavy rare earth element slurry. The working principles of the atomizing unit 2 and the collecting unit 3 belong to conventional technical means of those skilled in the art, so they are not elaborated in detail. Both ends of the frame 1 are fixed with a driving motor 4, and the output ends of the driving motors at both ends are arranged relatively opposite to each other. A coaxially arranged mounting seat 5 is welded and fixed to the output end of the driving motor 4, and a base is arranged on the mounting seat 5. The base 6 has a coaxial annular groove on its circumference, and a plurality of clamping structures are arranged in the annular groove. The clamping structure includes a support 7 slidably connected to the annular groove, and a locking pin is detachably connected between the support 7 and the annular groove (conventional technical means, so it is not drawn in the figure). Two fixed shafts 8 are integrally formed on the support 7, and the fixed shafts 8 are perpendicular to the mounting seat. The ends of the fixed shafts 8 are coaxially slidably connected to clamping arms 9, and telescopic rods 11 are arranged between the fixed shafts 8 and the clamping arms 9. The ends of the clamping arms 9 are fixedly connected to tightening columns 10 parallel to the mounting seat 5.

[0031] In this solution, the magnet is placed on the frame 1, and the clamping point is adjusted by sliding the support 7, and then the locking pin is installed to fix the support 7; by controlling the telescopic rod 11 to shorten, the telescopic rod 11 drives the clamping column 10 to move toward the magnet until the clamping column 10 and the magnet are against each other, thereby forming a multi-point clamping of the two ends of the magnet; then the atomization unit 2 atomizes the heavy rare earth element slurry, and drives the magnet to rotate in the atomized slurry by driving the motor 4 and the mounting seat 5 and the base 6. During the rotation process, by controlling one of the corresponding telescopic rods 11 on the support 7 to extend, the clamping column 10 is driven to temporarily detach from the magnet. After multiple rotations, the telescopic rod 11 is controlled to shorten, driving the corresponding clamping column 10 to resume clamping the magnet, and at the same time controlling the other telescopic rod 11 to extend, so as to control the clamping column 10 to alternately clamp the magnet, so as to avoid the contact surface between the clamping column 10 and the magnet being unable to be coated with slurry.

[0032] The beneficial effects of this solution are:

[0033] 1. The heavy rare earth element slurry is atomized and distributed in the sintering furnace through the atomizing unit 2, and then the rotating diffusion device is used to drive the magnet to rotate continuously in the atomized slurry, so that the atomized slurry covers the magnet, and the magnet is subsequently rotated to make the slurry evenly diffuse on the surface of the magnet; the magnet is continuously rotated to form multiple repeated coatings on the magnet; compared with a single coating, the present application can better control the thickness and uniformity of the coating through multiple repeated coatings, thereby achieving the technical effect of evenly covering the heavy rare earth elements on the magnet.

[0034] 2. In addition, compared with one-time coating, multiple layer-by-layer coating and diffusion can make up for the defects in the previous coating, avoid the diffusion unevenness caused by uneven thickness of a single coating, and ensure that the overall coating is more uniform on the magnet surface.

[0035] 3. Recovering excess slurry through the collection unit 3 for secondary coating can effectively reduce material waste and improve the utilization rate of the coating. This not only reduces production costs, but also reduces the impact on the environment.

[0036] 4. Compared with one-time coating, the penetration depth and diffusion speed of the elements can be controlled by adjusting the number of coatings and the rotation rate of the magnet, making the diffusion of heavy rare earth elements on the magnet surface more controllable, thereby optimizing the performance of the magnet.

[0037] 5. Multiple coating and diffusion can ensure that the heavy rare earth elements penetrate into all parts of the magnet more evenly, thereby improving the magnet's anti-demagnetization ability and overall magnetic properties, especially in high-demand application scenarios.

[0038] 6. Since the thickness of each coating is thin, the adhesion between the coating and the magnet surface is stronger, reducing the risk of coating peeling during heat treatment, thereby improving the stability of the coating.

[0039] In this embodiment, an adjustment structure is provided between the mounting seat 5 and the base 6, and the adjustment structure includes a guide rail 12 that is in contact with the end face of the mounting seat 5, and a plurality of slide grooves parallel to each other are provided on the end face of the mounting seat 5 facing the base 6, and the slide grooves are perpendicular to the guide rail 12, and an adjustment seat 13 is slidably connected in the slide groove, and a positioning pin is provided between the adjustment seat 13 and the slide groove (conventional technical means, so not drawn in the figure), and the adjustment seat 13 is fixedly connected to the adjacent guide rail 12; a deflection seat 14 is slidably connected to the guide rail 12, and the same positioning pin is also provided between the deflection seat 14 and the guide rail 12, and a support rod 15 fixedly connected to the base 6 is connected to the deflection seat 14 with a ball joint, and the support rod 15 is a telescopic structure, and a locking structure for limiting the telescopic and deflection of the support rod 15 is provided on the deflection seat 14.

[0040] In this solution, when the base 6 at both ends is concentric with the mounting seat 5, the rotation center of the magnet is in the same straight line as the rotation center of the mounting seat 5; after the clamping structure clamps the magnet, the restriction of the locking structure on the support rod 15 is released, and the positioning pin is removed, and the position of the base 6 on the mounting seat 5 is adjusted by sliding the adjustment seat 13 and the deflection seat 14, so as to adjust the rotation center of the magnet, so that the rotation center of the irregular magnet is more consistent with the center of the magnet, so that the end faces of the magnet can contact the slurry more evenly.

[0041] In this embodiment, the locking structure includes a plurality of circumferentially distributed diagonal support rods 16, the diagonal support rods 16 are ball-jointedly connected to the deflection seat 14, the ends of the diagonal support rods 16 are coaxially slidably connected to adjustment rods, the ends of the adjustment rods are ball-jointedly connected to the side walls of the telescopic ends of the support rods 15, and the diagonal support rods 16 and the adjustment rods are detachably connected by limit pins (conventional technical means, so not drawn in the figure).

[0042] When the support rod 15 needs to be adjusted, it is only necessary to remove the limit pin so that the adjustment rod can slide relative to the diagonal support rod 16; if the support rod 15 needs to be locked, the limit pin can be reinstalled; the entire operation process is simple and quick.

[0043] In this embodiment, reinforcing ribs 18 are provided between the two ends of the adjustment seat 13 and the guide rail 12 , so as to strengthen the connection strength between the guide rail 12 and the adjustment seat 13 .

[0044] In this embodiment, clamping plates 19 that fit the guide rail 12 are provided on both sides of the deflection seat 14 . The clamping plates 19 are provided to support the guide rail 12 and prevent the guide rail 12 from bending.

[0045] In this embodiment, a motor cover 20 for shielding the driving motor 4 is provided on the driving motor 4 to prevent slurry from entering the driving motor 4 and causing damage to the driving motor 4 .

[0046] In this embodiment, a plurality of protrusions 21 are provided at both ends of the bottom of the frame 1 so that the frame 1 is suspended in the air to avoid affecting the circulation of the atomized slurry.

[0047] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A rotary diffusion device for a vacuum sintering furnace, comprising an atomizing unit, a collecting unit and a frame placed in the vacuum sintering furnace, wherein the atomizing unit is used to atomize a heavy rare earth element slurry, and the collecting unit is used to recover the atomized heavy rare earth element slurry, characterized in that: Driving motors are arranged opposite to each other at two ends of the frame body, a mounting seat is coaxially arranged on the output end of the driving motor, a base is arranged on the mounting seat, a coaxial annular groove is opened on the circumference of the base, a plurality of clamping structures are arranged in the annular groove, the clamping structure includes a support slidably connected to the annular groove, a locking pin is detachably connected between the support and the annular groove, two fixed shafts perpendicular to the mounting seat are fixed on the support, clamping arms are coaxially slidably connected to the ends of the fixed shafts, a telescopic rod is arranged between the fixed shaft and the clamping arm, and a tightening column parallel to the mounting seat is arranged at the ends of the clamping arms.

2. A rotary diffusion device for a vacuum sintering furnace according to claim 1, characterized in that: An adjustment structure is provided between the mounting seat and the base, and the adjustment structure includes a guide rail that fits with the end surface of the mounting seat, and a plurality of slide grooves parallel to each other are provided on the end surface of the mounting seat facing the base, and the slide grooves are perpendicular to the guide rails, and an adjustment seat is slidably connected in the slide grooves, and a positioning pin is provided between the adjustment seat and the slide grooves, and the adjustment seat is fixedly connected to adjacent guide rails; a deflection seat is slidably connected to the guide rails, and the same positioning pin is also provided between the deflection seat and the guide rails, and a support rod fixedly connected to the base is connected by a ball joint on the deflection seat, and the support rod is a telescopic structure, and a locking structure for limiting the telescopic and deflection of the support rod is provided on the deflection seat.

3. A rotary diffusion device for a vacuum sintering furnace according to claim 2, characterized in that: The locking structure includes a plurality of circumferentially distributed diagonal support rods, the diagonal support rods are connected to the deflection seat with a ball joint, the ends of the diagonal support rods are coaxially slidably connected with adjustment rods, the ends of the adjustment rods are connected to the side walls of the telescopic ends of the support rods with a ball joint, and the diagonal support rods and the adjustment rods are detachably connected with limit pins.

4. The rotary diffusion device for a vacuum sintering furnace according to claim 3, characterized in that: Reinforcing ribs are arranged between the two ends of the adjustment seat and the guide rails.

5. The rotary diffusion device for a vacuum sintering furnace according to claim 4, characterized in that: Clamping plates that fit the guide rails are arranged on both sides of the deflection seat.

6. The rotary diffusion device for a vacuum sintering furnace according to claim 5, characterized in that: The driving motor is provided with a motor cover for shielding the driving motor.

7. The rotary diffusion device for a vacuum sintering furnace according to claim 6, characterized in that: A plurality of protrusions are arranged at both ends of the bottom of the frame.

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