A Coating Method and Coating Device for Alloy Magnetic Powder

Abstract

The present invention discloses a coating method and a coating device for alloy magnetic powder, which relates to the technical field of magnetic powder coating. The device includes: a base, a cavity is formed in the base, and a motor is arranged in the cavity; a rotating member, a rotating shaft is vertically arranged at the central position of the bottom of the rotating member, and the end of the rotating shaft away from the rotating member extends into the cavity and is fixedly connected to the output end of the motor. A horizontal sliding space is arranged on the rotating member, and a lower sliding seat that can only slide horizontally is slidably assembled at the bottom of the horizontal sliding space; an open cylinder body, the cylinder body is detachably fixed on the top of the lower sliding seat; a horizontal driving structure, the horizontal driving structure can drive the sliding seat to slide left and right reciprocally in the horizontal sliding space when the rotating member rotates. By using the coating device to mix and coat the magnetic powder, compared with the mechanical stirring method in the conventional technology, the present invention has the advantages that the stirring can be more uniform, and thus the coating effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic powder coating, and specifically to a coating method and a coating device for alloy magnetic powder. Background Art

[0002] Insulating coating is a key technology in the preparation process of amorphous and nanocrystalline magnetic powder cores. The performance of the insulating coating layer is an important factor affecting the high-frequency loss of magnetic powder cores. If the insulating layer is incompletely coated or damaged, the eddy current loss between magnetic powder particles will increase sharply, thereby increasing the high-frequency loss of magnetic powder cores.

[0003] In the preparation process of magnetic powder insulating coating, the mechanical stirring method is usually used to complete the coating work of magnetic powder. In the conventional mechanical stirring method, a stirring rod is generally used to stir the magnetic powder and the coating solution to make the two mix evenly to achieve magnetic powder coating. However, in the stirring process, since most of the magnetic powder is deposited at the bottom of the container, although the stirring rod can stir the magnetic powder, its stirring can only make the magnetic powder turn horizontally, which will cause the magnetic powder at the bottom layer to be incompletely and unevenly coated. Summary of the Invention

[0004] The purpose of the present invention is to provide a coating method and a coating device for alloy magnetic powder to solve the problems raised in the above background art.

[0005] To achieve the above invention purpose, the present invention adopts the following technical solutions:

[0006] A coating method for alloy magnetic powder provided by the present invention includes the following steps:

[0007] Step 1: Add the magnetic powder into an aqueous phosphoric acid solution containing 1 wt% phosphoric acid, and continuously stir with a glass rod for 30 min;

[0008] Step 2: After filtering out the magnetic powder in Step 1, wash it three times with deionized water first, then wash it three times with absolute ethanol, and then place the magnetic powder in a vacuum oven at 60 °C for drying until the magnetic powder is completely dry to obtain the pretreated magnetic powder.

[0009] Step 3: Add the magnetic powder in Step 2 and a boron resin-alcohol solution with a concentration of 0.5 wt% into the cylinder respectively. Then fix the cylinder on the lower sliding seat and cover the lid. Start the motor to make the cylinder move continuously along the spiral line, so that the magnetic powder tumbles continuously in the cylinder, and at the same time, the stirring shaft drives the stirring rod to rotate forward and backward in the cylinder to stir the magnetic powder.

[0010] Step 4: Remove the cylinder from the lower sliding seat, take out and filter the magnetic powder in the cylinder, and then put the magnetic powder into a blast drying oven for drying to obtain the magnetic powder with boron phenolic resin coated on the surface.

[0011] Furthermore, in step three, the motor speed is 50-100 rpm, and the working time of the motor is 3-5 minutes.

[0012] Furthermore, in step 1, the amount of the phosphoric acid aqueous solution used accounts for 0.1wt% to 1wt% of the total mass of the magnetic powder.

[0013] 4. The present invention also provides a coating device for a coating method of alloy magnetic powder, comprising:

[0014] A base, wherein a cavity is formed in the base, and a motor is arranged in the cavity;

[0015] A rotating member, wherein a rotating shaft is vertically arranged at the center position of the bottom of the rotating member, and an end of the rotating shaft away from the rotating member extends into the cavity and is fixedly connected to the output end of the motor, and a transverse sliding space is arranged on the rotating member, and a lower sliding seat that can only slide in the horizontal direction is slidingly assembled at the bottom of the transverse sliding space;

[0016] An open cylinder body, which is detachably fixed to the top of the lower sliding seat;

[0017] A transverse driving structure, wherein the transverse driving structure can drive the sliding seat to slide back and forth in the transverse sliding space when the rotating member is rotated, so that the cylinder body moves back and forth on both sides of the rotating shaft;

[0018] A cover assembly, the cover assembly comprising a cover detachably arranged at the open end of the cylinder, and a stirring shaft coaxially and rotatably mounted on the cover, the stirring shaft passing through the cover and rotatably cooperating with the cover, the bottom end of the stirring shaft being provided with a stirring rod closely attached to the bottom surface of the cylinder; and

[0019] The rotary driving structure comprises a gear mounted on the top of the stirring shaft and a rack mounted in the transverse sliding space along the sliding direction of the lower sliding seat, wherein the rack is meshed with the gear.

[0020] Further, the rotating member comprises a lower U-shaped plate and an upper U-shaped plate which are clamped to each other, the lower U-shaped plate comprises a lower horizontal section, and lower vertical sections which are symmetrically and vertically connected to both ends of the lower horizontal section, wherein the rotating shaft is vertically arranged at the center position of the bottom of the lower horizontal section, a first sliding groove which is adapted to the lower sliding seat is provided at the top of the lower horizontal section along its length direction, and a downward groove at the top of the lower sliding seat forms a limiting groove which is adapted to the cylinder, and a clamping groove with an open top is provided inside the lower vertical section;

[0021] The upper U-shaped plate includes an upper horizontal section, and upper vertical sections symmetrically and perpendicularly connected to both ends of the upper horizontal section. Among them, the upper vertical sections are adapted to the clamping grooves, a second chute corresponding to the first chute is penetrated and opened on the upper horizontal section, and an upper sliding seat is slidably adapted in the second chute. The cover body is fixedly arranged at the bottom of the upper sliding seat, and the top of the stirring shaft also penetrates through the top of the upper sliding seat. The rack is fixed to the top of the upper sliding seat through a connecting member.

[0022] Further, the height of the bottom end of the stirring shaft is greater than the height of the bottom end of the upper vertical section. A protective shell is also arranged on the top of the upper U-shaped plate, and a handle is arranged on the top of the protective shell.

[0023] Further, the transverse driving structure includes an elliptical enclosing plate arranged on the top of the base. The center of the elliptical enclosing plate is located on the central axis of the rotating shaft. An elliptical limiting strip is arranged on the inner side of the elliptical enclosing plate, and an elliptical slideway is opened at the bottom of the elliptical limiting strip. A guiding strip is arranged on one side of the lower sliding seat. One end of the guiding strip away from the lower sliding seat penetrates through the lower U-shaped plate and extends vertically below the elliptical slideway to be provided with a guiding column. The guiding column is slidably adapted in the elliptical slideway. When the guiding strip and the minor axis of the elliptical enclosing plate are in the same vertical plane, the lower sliding seat is located at one end of the lower sliding groove. When the guiding strip and the major axis of the elliptical enclosing plate are in the same vertical plane, the lower sliding seat is located at the other end of the lower sliding groove.

[0024] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0025] In the present invention, the magnetic powder is mixed and coated through the coating device. Compared with the mechanical stirring method in the conventional technology, the stirring can be more uniform, so that the coating effect is better.

[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0028] Figure 1 is the overall structural schematic diagram of the present invention;

[0029] Figure 2 is the top view structural schematic diagram of the present invention;

[0030] Figure 3 is Figure 2 the schematic structural diagram in the A-A direction of

[0031] Figure 4 is Figure 3 a partial structural schematic diagram of part A;

[0032] Figure 5 is a schematic diagram of the overall split structure of the present invention;

[0033] Figure 6 is a schematic diagram of the split structure of the rotating part of the present invention;

[0034] Figure 7 is a schematic diagram of the moving direction of magnetic powder when the stirring shaft of the present invention rotates counterclockwise;

[0035] Figure 8 is a schematic diagram of the moving structure of magnetic powder when the stirring shaft of the present invention rotates clockwise.

[0036] In the figure:

[0037] 100, base; 110, cavity; 120, motor;

[0038] 200, rotating part; 210, rotating shaft; 220, horizontal sliding space; 230, lower sliding seat; 240, lower U-shaped plate; 241, lower horizontal section; 242, lower vertical section; 243, first chute; 244, limiting groove; 245, clamping groove; 250, upper U-shaped plate; 251, upper horizontal section; 252, vertical section; 253, second chute; 260, upper sliding seat;

[0039] 300, cylinder;

[0040] 400, lateral driving structure; 410, oval enclosing plate; 420, oval limiting strip; 430, oval slideway; 440, guiding strip; 450, guiding column;

[0041] 500, cover assembly; 510, cover; 520, stirring shaft; 530, stirring rod;

[0042] 600, rotary driving structure; 610, gear; 620, rack;

[0043] 700, protective shell; 710, handle. Detailed implementation manners

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0045] The insulation coating of magnetic powder is a key technology in the preparation process of amorphous and nanocrystalline magnetic powder cores. The performance of the insulation coating layer is an important factor affecting the high-frequency loss of magnetic powder cores. If the insulation layer is incompletely coated or damaged, the eddy current loss between magnetic powder particles will increase sharply, thereby increasing the high-frequency loss of magnetic powder cores.

[0046] In the process of preparing the insulation coating of magnetic powder, the mechanical stirring method is usually used to complete the coating work of magnetic powder. In the mechanical stirring method of conventional technology, a stirring rod is generally used to stir the magnetic powder and the coating solution to make them mix evenly to achieve the coating of magnetic powder. However, in the stirring process of this method, since most of the magnetic powder is deposited at the bottom of the container, although the stirring rod can stir the magnetic powder, its stirring can only make the magnetic powder turn horizontally, which will cause the magnetic powder at the bottom layer to be incompletely and unevenly coated.

[0047] Therefore, in order to reduce the coating time and improve the integrity and uniformity of the coating layer, as Figures 1 - 8 shown, the present invention designs a coating device, which includes a base 100, a rotating member 200, an open cylinder 300, a lateral driving structure 400, a cover assembly 500 and a rotating driving structure 600.

[0048] Among them, a cavity 110 is formed in the base 100, and a motor 120 is arranged in the cavity 110; a rotating shaft 210 is vertically arranged at the central position of the bottom of the rotating member 200, and one end of the rotating shaft 210 away from the rotating member 200 extends into the cavity 110 and is fixedly connected to the output end of the motor 120. A lateral sliding space 220 is arranged on the rotating member 200, and a lower sliding seat 230 that can only slide horizontally is slidably assembled at the bottom of the lateral sliding space 220; the cylinder 300 is detachably fixed on the top of the lower sliding seat 230; the lateral driving structure 400 can drive the sliding seat to slide left and right in the lateral sliding space 220 when the rotating member 200 rotates, so that the cylinder 300 reciprocates on both sides of the rotating shaft 210; the cover assembly 500 includes a cover 510 detachably arranged at the open end of the cylinder 300, and a stirring shaft 520 coaxially and rotatably assembled on the cover 510. The stirring shaft 520 penetrates the cover 510 and is rotationally matched with the cover 510. A stirring rod 530 closely attached to the bottom surface of the cylinder 300 is arranged at the bottom end of the stirring shaft 520; the rotating driving structure 600 includes a gear 610 assembled at the top end of the stirring shaft 520, and a rack 620 assembled in the lateral sliding space 220 along the sliding direction of the lower sliding seat 230. The rack 620 meshes with the gear 610.

[0049] Based on the above design, during use, the coated magnetic powder and the coating solution are respectively poured into the cylinder body 300. After the cover body 510 is covered, the motor 120 is started. The output end of the motor 120 drives the rotating shaft 210 to rotate, and then the rotating member 200 rotates around the central axis of the rotating shaft 210. During this process, the lateral driving structure 400 is started, and under its drive, the sliding seat 230 reciprocates left and right within the lateral sliding space 220 of the rotating member 200, and then the cylinder body 300 reciprocates on both sides of the rotating shaft 210. At this time, the cylinder body 300 has three special positions during the movement, namely the first position where the lower sliding seat 230 is located at the left end of the first sliding groove 243, the second position where the lower sliding seat is located at the right end of the first sliding groove 243, and the third position where the lower sliding seat 230 is located in the middle of the first sliding groove 243;

[0050] When the lower sliding seat 230 moves from the first position towards the third position, the cylinder body 300 and the rotating shaft 210 are eccentrically arranged. The cylinder body 300 rotates around the central axis of the rotating shaft 210. During this process, under the action of centrifugal force, the magnetic powder moves to the side of the cylinder body 300 close to the left end of the first sliding groove 243. Since the stirring shaft 520 rotates during this process, the stirring rod 530 can bring the magnetic powder at the bottom layer to the other side of the cylinder body 300. At this time, the upper-layer magnetic powder sinks under the action of gravity to become the bottom-layer magnetic powder, so that the magnetic powder is tumbled longitudinally. It is worth mentioning that during the above process, since the cylinder body 300 is continuously moving towards the rotating shaft 210, that is, the linear velocity of the movement of the cylinder body 300 is continuously decreasing, that is, the centrifugal force generated is also continuously decreasing, the height of the magnetic powder accumulated on one side of the cylinder body 300 can be reduced, that is, the magnetic powder will slide along the inner wall of the cylinder body 300 to both sides, so that the magnetic powder can fully contact the coating solution;

[0051] When the lower sliding seat 230 moves to the third position, the cylinder body 300 and the rotating shaft 210 are coaxial. At this time, the magnetic powder in the cylinder body 300 will evenly move towards the four groups of the cylinder body 300;

[0052] When the lower sliding seat 230 moves from the third position towards the second position, the cylinder body 300 and the rotating shaft 210 are eccentrically arranged. The cylinder body 300 rotates around the central axis of the rotating shaft 210. During this process, under the action of centrifugal force, the magnetic powder moves to the side of the cylinder body 300 far from the left end of the first sliding groove 243. Since the stirring shaft 520 rotates during this process, the stirring rod 530 can bring the magnetic powder at the bottom layer to the other side of the cylinder body 300. At this time, the upper-layer magnetic powder sinks under the action of gravity to become the bottom-layer magnetic powder, so that the magnetic powder is tumbled longitudinally. It is worth mentioning that during the above process, since the cylinder body 300 is continuously moving away from the rotating shaft 210, that is, the linear velocity of the movement of the cylinder body 300 is continuously increasing, that is, the centrifugal force generated is also continuously increasing, the height of the magnetic powder accumulated on one side of the cylinder body 300 can be increased, so that the magnetic powder can fully contact the coating solution in terms of orientation.

[0053] To facilitate the extraction of the cylinder body 300 from the horizontal sliding space 220 and improve the stability of the cylinder body 300 during movement, in a specific embodiment of the present invention, the rotating member 200 includes a lower U-shaped plate 240 and an upper U-shaped plate 250 that are clamped to each other. The lower U-shaped plate 240 includes a lower horizontal section 241 and lower vertical sections 242 that are symmetrically and perpendicularly connected to both ends of the lower horizontal section 241. Among them, the rotating shaft 210 is vertically disposed at the center position of the bottom of the lower horizontal section 241. A first chute 243 adapted to the lower sliding seat 230 is formed at the top of the lower horizontal section 241 along its length direction, and a limiting groove 244 adapted to the cylinder body 300 is formed by a downward groove at the top of the lower sliding seat 230. A clamping groove 245 with an open top is provided inside the lower vertical section 242; the upper U-shaped plate 250 includes an upper horizontal section 251 and upper vertical sections 252 that are symmetrically and perpendicularly connected to both ends of the upper horizontal section 251. Among them, the upper vertical section 252 is adapted to the clamping groove 245. A second chute 253 corresponding to the first chute 243 is formed through the upper horizontal section 251, and an upper sliding seat 260 is slidably fitted in the second chute 253. The cover body 510 is fixedly provided at the bottom of the upper sliding seat 260, and the top of the stirring shaft 520 also penetrates through the top of the upper sliding seat 260. The rack 620 is fixed to the top of the upper sliding seat 260 through a connecting member. Based on the above design, this technical solution not only can complete the limiting work of the cylinder body 300 but also can complete the limiting work of the cover body 510 by the mutual clamping of the lower U-shaped plate 240 and the upper U-shaped plate 250. At the same time, by clamping the lower sliding seat 230 and the upper sliding seat 260 at both ends of the cylinder body 300, the stability of the cylinder body 300 during movement is improved.

[0054] Specifically, during use, after the coated magnetic powder and the coating solution are respectively poured into the cylinder body 300, the cylinder body 300 can be placed in the limiting groove 244 of the lower sliding seat 230. Subsequently, the two upper vertical sections 252 of the upper U-shaped plate 250 are respectively inserted into the clamping groove 245 and fixed with limit screws. At this time, the cover body 510 can cover the top of the cylinder body 300, sealing and limiting the cylinder body 300 in the horizontal sliding space 220 to complete the fixation of the cylinder body 300. Similarly, after the coating work is completed, after removing the upper U-shaped plate 250, it is convenient to take out the magnetic powder inside the cylinder body 300 for subsequent processing of the magnetic powder.

[0055] Further, in this specific embodiment, the height of the bottom end of the stirring shaft 520 is greater than the height of the bottom end of the upper vertical section 252. A protective shell 700 is further provided at the top of the upper U-shaped plate 250, and a handle 710 is provided at the top of the protective shell 700. Based on the above design, after the upper U-shaped plate 250 is removed from the lower U-shaped plate 240, a pair of upper vertical sections 252 of the upper U-shaped plate 250 can form support feet, so that the stirring shaft 520 is placed suspended to avoid damage to the stirring shaft 520 (the stirring shaft 520 is made of glass material).

[0056] Considering that the cylinder 300 rotates continuously around the rotating shaft 210, if the lateral driving structure 400 adopts a driving mechanism in the conventional technology, such as an electric telescopic cylinder, it is necessary to consider the line connection, that is, an electric slip ring needs to be used to supply power to the electric telescopic cylinder, which increases the production cost and is not convenient for later maintenance. Therefore, in this specific embodiment, the lateral driving structure 400 includes an oval-shaped enclosing plate 410 provided on the top of the base 100. The center of the oval-shaped enclosing plate 410 is located on the central axis of the rotating shaft 210. An oval-shaped limiting strip 420 is provided on the inner side of the oval-shaped enclosing plate 410. An oval-shaped slideway 430 is opened at the bottom of the oval-shaped limiting strip 420. A guiding strip 440 is provided on one side of the lower sliding seat 230. The end of the guiding strip 440 away from the lower sliding seat 230 penetrates through the lower U-shaped plate 240 and extends vertically below the oval-shaped slideway 430 to be provided with a guiding column 450. The guiding column 450 is slidably fitted in the oval-shaped slideway 430. When the guiding strip 440 and the short axis of the oval-shaped enclosing plate 410 are located in the same vertical plane, the lower sliding seat 230 is located at one end of the lower sliding groove. When the guiding strip 440 and the long axis of the oval-shaped enclosing plate 410 are located in the same vertical plane, the lower sliding seat 230 is located at the other end of the lower sliding groove. Based on the above design, during use, when the motor 120 drives the rotating member 200 to rotate through the rotating shaft 210, the sliding column of the guiding strip 440 will also move synchronously in the oval-shaped slideway 430. During this process, when the guiding strip 440 moves in the oval-shaped slideway 430 to be located in the same vertical plane as the short axis of the oval-shaped enclosing plate 410, the lower sliding seat 230 is located at one end of the lower sliding groove. When the guiding strip 440 moves in the oval-shaped slideway 430 to be located in the same vertical plane as the long axis of the oval-shaped enclosing plate 410, the lower sliding seat 230 is located at the other end of the lower sliding groove. That is, during one rotation of the rotating shaft 210, the cylinder 300 will make two reciprocating movements left and right within the lateral sliding space 220.

[0057] In order to further improve the coating effect of the magnetic powder, in a specific embodiment of the present invention, the stirring shaft 520 is tangent to the outer peripheral surface of the rotating shaft 210, and the cross-section of the stirring shaft 520 is in an isosceles triangle shape. Based on the above design, as Figure 7As shown, when the stirring shaft 520 rotates forward, the stirring rod 530 can stir the magnetic powder towards the center of the inner cylinder 300, as Figure 8 shown, when the stirring shaft 520 rotates in the reverse direction, the stirring rod 530 can stir the magnetic powder towards the outside of the inner cylinder 300, so that the magnetic powder can fully contact the coating solution.

[0058] The present invention also provides a method for coating alloy magnetic powder; the method includes the following steps:

[0059] Step 1: Add the magnetic powder into a phosphoric acid aqueous solution containing 1 wt% phosphoric acid, and continuously stir with a glass rod for 30 min. Among them, the dosage of the phosphoric acid aqueous solution accounts for 0.1 wt% - 1 wt% of the total mass of the magnetic powder;

[0060] Step 2: After filtering out the magnetic powder in Step 1, wash it three times with deionized water first, then wash it three times with absolute ethanol, and then place the magnetic powder in a vacuum oven and dry it at 60 °C until the magnetic powder is completely dry, obtaining the pretreated magnetic powder.

[0061] Step 3: Add the magnetic powder in Step 2 and a boron resin - alcohol solution with a concentration of 0.5 wt% into the cylinder 300 respectively. Then fix the cylinder 300 on the lower sliding seat 230 and cover the cover 510. After that, start the motor 120 to make the cylinder 300 move continuously along the spiral line, so that the magnetic powder tumbles continuously in the cylinder 300. At the same time, make the stirring shaft 520 drive the stirring rod 530 to rotate forward and backward in the cylinder 300 to stir the magnetic powder. The rotation speed of the motor 120 is 50 - 100 rpm, and the working time of the motor 120 is 3 - 5 min.

[0062] Step 4: Remove the cylinder 300 from the lower sliding seat 230, take out and filter the magnetic powder in the cylinder 300, and then put the magnetic powder into a blast drying oven for drying to obtain the magnetic powder with a surface coated with boron phenolic resin.

[0063] In this specific embodiment, in Step 3, the rotation speed of the motor 120 is 50 - 100 rpm, and the working time of the motor 120 is 3 - 5 min.

[0064] The following lists several embodiments of using the coating device of the present invention for coating magnetic powder

[0065] Embodiment 1, Step 1: Add the iron - nickel magnetic powder with a particle size of 100 mesh - 200 mesh into a phosphoric acid aqueous solution containing 1 wt% phosphoric acid, and continuously stir with a glass rod for 30 min. Among them, the dosage of the phosphoric acid aqueous solution accounts for 0.1 wt% of the total mass of the magnetic powder;

[0066] Step 2: After filtering out the iron-nickel magnetic powder in Step 1, wash it three times with deionized water first, then wash it three times with absolute ethanol, and then place the iron-nickel magnetic powder in a vacuum oven and dry it at 60 °C until the magnetic powder is completely dry, obtaining the pretreated iron-nickel magnetic powder.

[0067] Step 3: Respectively add the iron-nickel magnetic powder in Step 2 and the boron resin-alcohol solution with a concentration of 0.5 wt% into the cylinder 300. Subsequently, fix the cylinder 300 on the lower sliding seat 230 and cover the cover body 510, then start the motor 120 to make the cylinder 300 continuously move along the spiral line, thereby making the magnetic powder continuously tumble in the cylinder 300. At the same time, make the stirring shaft 520 drive the stirring rod 530 to rotate forward and backward in the cylinder 300 to stir the magnetic powder. The rotation speed of the motor 120 is 50 rpm, and the working time of the motor 120 is 5 min.

[0068] Step 4: Remove the cylinder 300 from the lower sliding seat 230, take out and filter the magnetic powder in the cylinder 300, and then put the magnetic powder into a blast drying oven to dry it, obtaining the iron-nickel magnetic powder with a boron phenolic resin coating on the surface.

[0069] Example 2, Step 1, add the iron-nickel magnetic powder with a particle size of 100 mesh - 200 mesh into the phosphoric acid aqueous solution containing 1 wt% phosphoric acid, and continuously stir it with a glass rod for 30 min. Among them, the dosage of the phosphoric acid aqueous solution accounts for 0.5 wt% of the total mass of the magnetic powder;

[0070] Step 2: After filtering out the iron-nickel magnetic powder in Step 1, wash it three times with deionized water first, then wash it three times with absolute ethanol, and then place the iron-nickel magnetic powder in a vacuum oven and dry it at 60 °C until the magnetic powder is completely dry, obtaining the pretreated iron-nickel magnetic powder.

[0071] Step 3: Respectively add the iron-nickel magnetic powder in Step 2 and the boron resin-alcohol solution with a concentration of 0.5 wt% into the cylinder 300. Subsequently, fix the cylinder 300 on the lower sliding seat 230 and cover the cover body 510, then start the motor 120 to make the cylinder 300 continuously move along the spiral line, thereby making the magnetic powder continuously tumble in the cylinder 300. At the same time, make the stirring shaft 520 drive the stirring rod 530 to rotate forward and backward in the cylinder 300 to stir the magnetic powder. The rotation speed of the motor 120 is 60 rpm, and the working time of the motor 120 is 4 min.

[0072] Step 4: Remove the cylinder 300 from the lower sliding seat 230, take out and filter the magnetic powder in the cylinder 300, and then put the magnetic powder into a blast drying oven to dry it, obtaining the iron-nickel magnetic powder with a boron phenolic resin coating on the surface.

[0073] Example 3, Step 1: Add iron-nickel magnetic powder with a particle size of 100 mesh - 200 mesh into an aqueous phosphoric acid solution containing 1 wt% phosphoric acid, and continuously stir with a glass rod for 30 min. Among them, the dosage of the aqueous phosphoric acid solution accounts for 0.1 wt% of the total mass of the magnetic powder;

[0074] Step 2: After filtering out the iron-nickel magnetic powder in Step 1, wash it three times with deionized water first, then wash it three times with absolute ethanol, and then place the iron-nickel magnetic powder in a vacuum oven and dry it at 60 °C until the magnetic powder is completely dry to obtain the pretreated iron-nickel magnetic powder.

[0075] Step 3: Add the iron-nickel magnetic powder in Step 2 and a boron resin-alcohol solution with a concentration of 0.5 wt% into the cylinder 300 respectively. Subsequently, fix the cylinder 300 on the lower sliding seat 230 and cover the cover 510, then start the motor 120 to make the cylinder 300 move continuously along the spiral line, so that the magnetic powder tumbles continuously in the cylinder 300. At the same time, make the stirring shaft 520 drive the stirring rod 530 to rotate forward and backward in the cylinder 300 to stir the magnetic powder. The rotation speed of the motor 120 is 100 rpm, and the working time of the motor 120 is 5 min.

[0076] Step 4: Remove the cylinder 300 from the lower sliding seat 230, take out and filter the magnetic powder in the cylinder 300, and then put the magnetic powder into a blast drying oven to dry to obtain iron-nickel magnetic powder with a boron phenolic resin coating on the surface.

[0077] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A coating device for alloy magnetic powder, characterized in that, It includes a base within which a cavity is formed, and a motor is disposed within the cavity; A rotating member, at the central position of the bottom of the rotating member, a rotating shaft is vertically provided, and the end of the rotating shaft away from the rotating member extends into the cavity and is fixedly connected to the output end of the motor. A lateral sliding space is provided on the rotating member, and a lower sliding seat that can only slide horizontally is slidably assembled at the bottom of the lateral sliding space; An open-ended cylinder body, which is detachably fixed to the top of the lower sliding seat; A lateral driving structure, which can drive the sliding seat to reciprocate left and right within the lateral sliding space when the rotating member rotates, so that the cylinder body reciprocates on both sides of the rotating shaft; A cover assembly, which includes a cover detachably provided at the open end of the cylinder body, and a stirring shaft coaxially and rotatably assembled on the cover. The stirring shaft penetrates through the cover and is rotatably matched with the cover. At the bottom end of the stirring shaft, a stirring rod closely attached to the bottom surface of the cylinder body is provided; and A rotation driving structure, which includes a gear assembled at the top end of the stirring shaft, and a rack assembled in the lateral sliding space along the sliding direction of the lower sliding seat. The rack is engaged with the gear.

2. The coating device for alloy magnetic powder according to claim 1, characterized in that, The rotating member includes a lower U-shaped plate and an upper U-shaped plate that are mutually clamped. The lower U-shaped plate includes a lower horizontal section, and lower vertical sections symmetrically and perpendicularly connected to both ends of the lower horizontal section. Among them, the rotating shaft is vertically provided at the central position of the bottom of the lower horizontal section. A first chute adapted to the lower sliding seat is opened at the top of the lower horizontal section along its length direction, and a limiting groove adapted to the cylinder body is formed by a downward groove at the top of the lower sliding seat. A clamping groove with an open top is provided inside the lower vertical section; The upper U-shaped plate includes an upper horizontal section, and upper vertical sections symmetrically and perpendicularly connected to both ends of the upper horizontal section. Among them, the upper vertical section is adapted to the clamping groove. A second chute corresponding to the first chute is penetrated and opened on the upper horizontal section, and an upper sliding seat is slidably fitted in the second chute. The cover is fixedly provided at the bottom of the upper sliding seat, and the top end of the stirring shaft also penetrates through the top of the upper sliding seat. The rack is fixedly provided at the top of the upper sliding seat through a connecting member.

3. The coating device for the alloy magnetic powder according to claim 2, characterized in that, The height of the bottom end of the stirring shaft is greater than the height of the bottom end of the upper vertical section. A protective shell is also provided at the top of the upper U-shaped plate, and a handle is provided at the top of the protective shell.

4. The coating device for alloy magnetic powder according to claim 2, characterized in that, The lateral driving structure includes an oval-shaped enclosing plate provided on the top of the base. The center of the oval-shaped enclosing plate is located on the central axis of the rotating shaft. An oval-shaped limiting strip is provided on the inner side of the oval-shaped enclosing plate. An oval-shaped sliding track is opened at the bottom of the oval-shaped limiting strip. A guiding strip is provided on one side of the lower sliding seat. The end of the guiding strip away from the lower sliding seat penetrates through the lower U-shaped plate and extends vertically below the oval-shaped sliding track to be provided with a guiding column. The guiding column is slidably fitted in the oval-shaped sliding track. When the guiding strip and the short axis of the oval-shaped enclosing plate are in the same vertical plane, the lower sliding seat is located at one end of the lower sliding groove. When the guiding strip and the long axis of the oval-shaped enclosing plate are in the same vertical plane, the lower sliding seat is located at the other end of the lower sliding groove.

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