A magnetic powder coating device and a coating method for processing a soft magnetic powder core

Abstract

This invention relates to the field of magnetic powder core processing technology, and discloses a magnetic powder coating device and a coating method for processing soft magnetic powder cores. The device includes a mixing tank, a stirring assembly located in the center of the mixing tank's inner cavity, a negative pressure powder dispersing assembly positioned obliquely around the stirring assembly, an atomizing assembly at the top of the mixing tank's inner cavity, and a driving assembly above the mixing tank. Magnetic powder with partially incomplete insulation layer coating and magnetic powder without insulation layer coating (hereinafter referred to as the magnetic powder mixture) are subjected to negative pressure attraction from the negative pressure powder dispersing assembly when falling. This causes the magnetic powder mixture to fall towards the side wall of the mixing tank's inner cavity and be drawn into the bottom of the negative pressure powder dispersing assembly, then sprayed out from the top of the assembly. This allows the magnetic powder mixture to come into contact again with the atomized coating agent sprayed by the atomizing assembly, further completing the coating of the magnetic powder insulation layer.

Description

Technical Field

[0001] This invention relates to the field of magnetic powder core processing technology, specifically to a magnetic powder coating device and a coating method for processing soft magnetic powder cores. Background Technology

[0002] Iron-silicon-aluminum alloy soft magnetic alloy powder cores have extremely low power loss characteristics and good DC superposition characteristics, and are widely used in household appliances such as photovoltaic inverters, DC charging piles, PFC circuits, and energy-saving variable frequency air conditioners, meeting the needs of high efficiency, energy saving and miniaturization of electronic components.

[0003] With societal development, modern human society relies increasingly on electronic devices for production and daily life, especially communication equipment. Electronic products are gradually becoming smaller, more integrated, and more multifunctional. Simultaneously, the demands on product performance are rising, placing stricter requirements on the widely used iron-silicon-aluminum alloy soft magnetic alloy powder cores. To meet market demands, manufacturers of iron-silicon-aluminum alloy soft magnetic alloy powder cores have had to rack their brains to optimize the powder core manufacturing process.

[0004] Magnetic powder insulating coating is a key process in the preparation of high-performance soft magnetic composite materials, and its core lies in achieving uniform bonding between magnetic powder particles and insulating coating agents. Traditional coating equipment typically uses a combination of mechanical stirring and spraying; however, in practical applications, uneven dispersion remains a problem. Because magnetic powder is prone to electrostatic agglomeration, existing stirring devices struggle to effectively break up these agglomerates, preventing the coating agent from fully contacting the magnetic powder core. Some equipment attempts to add centrifugal dispersion mechanisms, but the centrifugal force generated by high-speed rotation causes magnetic powder to accumulate against the barrel wall, exacerbating localized agglomeration and hindering the coating agent's penetration into the powder clumps. Secondly, fluidized bed coating methods involve separately driving the magnetic powder and coating agent through high-speed airflow, bringing them into contact in a closed environment. However, due to the uncertainty of the airflow and the unevenness of dispersion, some magnetic powder fails to contact the coating agent, thus failing to form an insulating layer, resulting in the magnetic powder mixing with the coated insulating powder. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a magnetic powder coating device and a coating method for processing soft magnetic powder cores. The device features magnetic powder with partially incomplete insulation layer coating and magnetic powder without insulation layer coating (hereinafter referred to as magnetic powder mixture) falling under the negative pressure of a negative pressure powder dispersing component. This causes the magnetic powder mixture to fall towards the inner wall of the mixing tank and be sucked into the bottom of the negative pressure powder dispersing component, then sprayed out from the top of the component. This allows the magnetic powder mixture to come into contact again with the atomized coating agent sprayed by the atomizing component, further completing the coating of the magnetic powder insulation layer. This invention solves the aforementioned problems.

[0007] (II) Technical Solution

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a magnetic powder coating device, comprising a mixing tank, a stirring assembly disposed inside the mixing tank, the stirring assembly being located in the middle of the inner cavity of the mixing tank, a negative pressure powder dispersing assembly disposed around the stirring assembly, the negative pressure powder dispersing assembly being inclinedly disposed around the inner cavity of the mixing tank, an atomizing assembly disposed at the top of the inner cavity of the mixing tank, and a driving assembly disposed above the mixing tank, the driving assembly comprising a fixed gear disc, a speed-increasing gear, and a synchronous driving frame, the stirring assembly being connected to the synchronous driving frame, the synchronous driving frame being rotatably disposed at the bottom of the fixed gear disc, the speed-increasing gear being rotatably disposed on the synchronous driving frame and meshing with the fixed gear disc, the negative pressure powder dispersing assembly being connected to the speed-increasing gear, and the atomizing assembly being connected to the driving assembly.

[0009] Preferably, a stand is provided on one side of the mixing tank, and a mounting plate is provided above the stand. The drive assembly is mounted on the mounting plate, the fixed gear is located at the bottom of the mounting plate, and the fixed gear is connected to the mounting plate by bolts.

[0010] Preferably, the driving assembly further includes a driving motor mounted above the mounting plate, a driving gear being provided at the output end of the driving motor, a driving rod being provided in the middle of the mixing barrel, the driving rod being a hollow tube, the atomizing group being mounted on the driving rod, and a transmission gear being provided above the driving rod, the driving gear being meshed with the transmission gear.

[0011] Preferably, a rotating ball is provided at the center of the upper part of the mixing tank, the drive rod is connected to the rotating ball and extends into the mixing tank and is connected to the stirring assembly, the drive rod passes through the mounting plate and the fixed toothed disc, and the drive rod is rotatably connected to the mounting plate and the fixed toothed disc, and the drive rod is fixedly connected to the synchronous drive frame.

[0012] Preferably, the atomizing assembly is mounted on the drive rod. The atomizing assembly includes a feed inlet, a spray pipe, and an atomizer. The feed inlet is rotatably disposed above the drive rod, and its bottom is connected to the drive rod. The spray pipe is distributed along the circumferential tangent of the drive rod and is located above the inner cavity of the mixing tank. The atomizer is located at the end of the spray pipe, and the nozzle of the atomizer faces the opposite direction to the rotation direction of the drive rod.

[0013] Preferably, one end of the speed-increasing gear is connected to a drive shaft, and the synchronous drive frame includes a mounting cylinder, a slanted rod, and a connecting cylinder. The mounting cylinder is rotatably mounted on the upper end of the drive shaft. The slanted rod is inclined downward on both sides of the mounting cylinder, and each slanted rod is tangent to the outer edge of the mounting cylinder. The connecting cylinder is located at the other end of the slanted rod. The drive shaft is rotatably connected to the slanted rod. The two drive shafts are inclined and intersecting at the middle, and the intersection is located at the position of the rotating ball. The drive shaft passes through the rotating ball and extends into the mixing tank to connect with the negative pressure powder dispersing assembly. The drive shaft is rotatably connected to the rotating ball.

[0014] Preferably, the stirring assembly includes a gathering lever and a stirring blade. The gathering lever is located at the bottom of the mixing tank, and the stirring blade is located above the gathering lever. The stirring blade is connected to the drive rod, and the surface of the stirring blade is provided with a material discharge hole.

[0015] Preferably, the gathering lever is tangentially connected to the drive rod around its periphery, the gathering lever is bent and the bending direction is the same as the rotation direction of the drive rod, the stirring blade is tilted in the opposite direction to the rotation direction of the drive rod, and when the stirring blade rotates, the material is subjected to an upward thrust from the stirring blade.

[0016] Preferably, the negative pressure powder dispersing assembly includes a negative pressure cylinder, a negative pressure paddle, and a conical auger. The negative pressure paddle is connected to the drive shaft. The negative pressure cylinder is sleeved outside the negative pressure paddle, and a connecting rod is provided between two negative pressure cylinders symmetrically arranged along the drive rod. The conical auger is located at the bottom of the negative pressure paddle, and the bottom of the conical auger is directly opposite the angle between the side wall and the bottom of the mixing tank. The connecting rod passes through the drive rod and is fixedly connected to the drive rod. A suction hole is provided at the bottom outer side of the negative pressure cylinder, and both the upper and lower ends of the negative pressure cylinder are connected to the mixing tank.

[0017] A coating method for processing soft magnetic powder cores, employing the aforementioned magnetic powder coating equipment.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides a magnetic powder coating device and a coating method for processing soft magnetic powder cores, which has the following beneficial effects:

[0020] 1. The magnetic powder coating equipment and coating method for processing soft magnetic powder cores utilize the airflow provided by the negative pressure powder dispersing component to disperse the magnetic powder and diffuse it towards the center of the mixing tank. At this time, the atomizing component connected to the drive component provides atomized coating agent into the mixing tank, ensuring full contact between the diffused magnetic powder and the atomized coating agent, thus coating the magnetic powder with an insulating layer. Some magnetic powder not fully coated with an insulating layer, as well as fully coated magnetic powder and the coating agent (hereinafter referred to as the coating agent mixture), fall towards the center of the mixing tank under the influence of gravity. The stirring component stirs and mixes the coating agent mixture, forming magnetic powder that completely coats the insulating layer. The magnetic powder that is not completely coated with the insulating layer and the magnetic powder that is not coated with the insulating layer (hereinafter referred to as the magnetic powder mixture) are attracted by the negative pressure of the negative pressure powder dispersing component when they fall. This part of the magnetic powder mixture falls towards the side wall of the inner cavity of the mixing tank and is sucked into the bottom of the negative pressure powder dispersing component. It is then sprayed out from the top of the negative pressure powder dispersing component, so that the magnetic powder mixture comes into contact with the atomized coating agent sprayed by the atomizing component again, and further completes the coating of the magnetic powder insulating layer.

[0021] 2. The magnetic powder coating equipment and coating method for processing soft magnetic powder cores utilize a drive motor in the drive assembly to drive the drive gear at its output end and mesh with the transmission gear, thereby driving the drive rod to rotate. This, in turn, drives the atomizing assembly to spray atomized insulating coating agent into the mixing tank. The insulating coating agent is poured into the top of the drive rod, which has a hollow tube inside. The drive gear and the transmission gear connect the drive motor and the drive rod to facilitate the pouring of the insulating coating agent from the top of the drive rod in the hollow tube. The drive rod drives the synchronous drive frame to rotate at the bottom of the fixed gear plate. When the synchronous drive frame rotates, it carries the speed-increasing gear to roll around the fixed gear plate. Due to the meshing state between the speed-increasing gear and the fixed gear plate, the speed-increasing gear rotates on its own axis while rolling, thereby driving the negative pressure powder dispersing assembly to rotate at high speed inside the mixing tank. At the same time, the drive rod is rotatably connected to the mixing tank through a rotating ball, so that the bottom of the drive rod extends into the interior of the mixing tank and drives the stirring assembly to rotate and stir at low speed.

[0022] 3. The magnetic powder coating equipment and coating method for processing soft magnetic powder cores involve filling the mixing tank with insulating coating agent through a hollow tubular drive rod connected to the inlet in the atomizing component. The inlet is connected to an external insulating coating agent supply device (this supply device is an existing structure and is not shown in the figure). The insulating coating agent enters the spray pipe through the hollow tube inside the drive rod and is then sprayed out by the atomizer. Since the spray pipe is distributed along the circumferential tangential surface of the drive rod and the nozzle of the atomizer rotates in the opposite direction to the drive rod, the atomized insulating coating agent diffuses to the periphery under the rotation of the drive rod, and then comes into contact with the magnetic powder dispersed upward by the negative pressure powder dispersing component.

[0023] 4. The magnetic powder coating equipment and coating method for processing soft magnetic powder cores utilize a gathering lever in the stirring assembly, driven by a drive rod, to gather the coating agent mixture falling from the bottom of the mixing tank towards the center. The gathered coating agent mixture is then tilted upwards by the stirring blades. Further agitated by the stirring blades with discharge holes, some of the coating agent mixture passes through the discharge holes, while the rest tilts upwards, allowing for better mixing and enabling the magnetic powder, which is partially incompletely coated with an insulating layer, to be re-coated with an insulating layer. The gathering lever is tangential to the drive rod and is bent (preferably arc-shaped). As the drive rod rotates, the gathering lever rotates at the bottom of the mixing tank, gathering the coating agent mixture from the bottom towards the center. The stirring blades are tilted in the opposite direction to the drive rod's rotation, further tilting the gathered coating agent mixture upwards as the stirring blades rotate.

[0024] 5. The magnetic powder coating equipment and coating method for processing soft magnetic powder cores utilize a negative pressure paddle and a conical auger in the negative pressure powder dispersing assembly. Driven by the drive shaft, the paddle and auger rotate simultaneously with the stirring assembly around the bottom of the mixing tank's inner cavity. As the conical auger rotates, it tumbles the magnetic powder mixture in the mixing tank upwards, preventing it from remaining in dead corners and removing it from the bottom of the mixing tank's inner cavity. Simultaneously, the negative pressure paddle rotates inside the negative pressure cylinder, generating negative pressure suction. Suction holes at the bottom and outer bottom of the negative pressure cylinder draw in the scattered magnetic powder from inside the mixing tank, as well as the magnetic powder mixture tumbled by the conical auger at the bottom of the mixing tank. The powder is then sprayed obliquely upwards from the top of the negative pressure cylinder, spraying it around the atomizing assembly so that the magnetic powder comes into contact with the atomized coating agent. The negative pressure cylinders on both sides are fixedly connected to the drive rod via connecting rods, keeping the negative pressure cylinders in a relatively "fixed" state. This allows the negative pressure paddle to rotate inside the negative pressure cylinders under the drive shaft's influence. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0026] Figure 2 This is a cross-sectional three-dimensional structural diagram of the mixing tank of the present invention.

[0027] Figure 3 This is one of the schematic diagrams of the driving and component parts of the present invention;

[0028] Figure 4 This is a second schematic diagram of the drive and component structure of the present invention;

[0029] Figure 5 This is one of the three-dimensional cross-sectional structural diagrams of the interior of the mixing tank of the present invention;

[0030] Figure 6 This is a second three-dimensional cross-sectional view of the interior of the mixing tank of the present invention;

[0031] Figure 7 This is one of the cross-sectional structural schematic diagrams of the stirring assembly and the negative pressure powder dispersing assembly of the present invention;

[0032] Figure 8 This is a second cross-sectional view of the stirring assembly and negative pressure powder dispersing assembly of the present invention.

[0033] In the diagram: 1. Mixing tank; 11. Stand; 12. Mounting plate; 2. Stirring assembly; 21. Gathering lever; 22. Stirring blade; 23. Discharge hole; 3. Negative pressure powder dispersing assembly; 31. Negative pressure cylinder; 32. Negative pressure blade; 33. Conical auger; 34. Connecting rod; 35. Suction hole; 4. Atomizing assembly; 41. Feed inlet; 42. Spray pipe; 43. Atomizer; 5. Drive assembly; 51. Fixed gear disc; 52. Speed-increasing gear; 521. Drive shaft; 53. Synchronous drive frame; 531. Mounting cylinder; 532. Inclined rod; 533. Connecting cylinder; 54. Drive motor; 541. Drive gear; 55. Drive rod; 551. Transmission gear; 6. Rotating ball. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-8 A magnetic powder coating device includes a mixing tank 1, a stirring assembly 2 disposed inside the mixing tank 1, the stirring assembly 2 being located in the middle of the inner cavity of the mixing tank 1, a negative pressure powder dispersing assembly 3 disposed around the stirring assembly 2, the negative pressure powder dispersing assembly 3 being inclinedly disposed around the inner cavity of the mixing tank 1, an atomizing assembly 4 disposed at the top of the inner cavity of the mixing tank 1, and a driving assembly 5 disposed above the mixing tank 1. The driving assembly 5 includes a fixed gear disc 51, a speed-increasing gear 52, and a synchronous driving frame 53. The stirring assembly 2 is connected to the synchronous driving frame 53, the synchronous driving frame 53 is rotatably disposed at the bottom of the fixed gear disc 51, the speed-increasing gear 52 is rotatably disposed on the synchronous driving frame 53 and is meshed with the fixed gear disc 51, the negative pressure powder dispersing assembly 3 is connected to the speed-increasing gear 52, and the atomizing assembly 4 is connected to the driving assembly 5.

[0036] In practical applications, the top cover (upper surface) of the mixing tank 1 is provided with a magnetic powder inlet for magnetic powder to enter, and the magnetic powder inlet is located directly above the negative pressure powder dispersing component 3;

[0037] In use, magnetic powder enters the mixing tank 1 through the magnetic powder inlet. Simultaneously, the drive assembly 5 drives the stirring assembly 2 and the negative pressure powder dispersing assembly 3. The synchronous drive frame 53 in the drive assembly 5 drives the speed-increasing gear 52 to rotate around the fixed gear disc 51. Since the speed-increasing gear 52 is meshed with the fixed gear disc 51, it rotates on its own axis while rolling around the fixed gear disc 51, thereby driving the negative pressure powder dispersing assembly 3 at its other end to operate inside the mixing tank 1, dispersing the magnetic powder inside the mixing tank 1. At the same time, the synchronous drive frame 53 drives the stirring assembly 2 to mix the magnetic powder partially coated with an insulating layer inside the mixing tank 1. After entering the mixing tank 1, the magnetic powder is first dispersed under the airflow provided by the negative pressure powder dispersing assembly 3 and diffuses towards the center of the mixing tank 1. At this time, the atomizing assembly 4 connected to the drive assembly 5 provides atomized powder into the mixing tank 1. The coating agent allows the diffused magnetic powder to fully contact the atomized coating agent, thus coating the magnetic powder with an insulating layer. Some of the magnetic powder that is not fully coated with an insulating layer, as well as the magnetic powder that is fully coated with an insulating layer and the coating agent (hereinafter referred to as the coating agent mixture), fall to the middle of the mixing tank 1 under the influence of gravity. The coating agent mixture is stirred and mixed by the stirring component 2, so that the coating agent mixture forms magnetic powder with a fully coated insulating layer. The magnetic powder that is not fully coated with an insulating layer and the magnetic powder that is not coated with an insulating layer (hereinafter referred to as the magnetic powder mixture) are subjected to the negative pressure attraction of the negative pressure powder dispersing component 3 when falling, causing this part of the magnetic powder mixture to fall towards the inner wall of the mixing tank 1 and be sucked into the bottom of the negative pressure powder dispersing component 3. It is then sprayed out from the top of the negative pressure powder dispersing component 3, so that the magnetic powder mixture comes into contact with the atomized coating agent sprayed by the atomizing component 4 again, further completing the coating of the magnetic powder with an insulating layer.

[0038] Furthermore, a support frame 11 is provided on one side of the mixing tank 1, and an mounting plate 12 is provided above the support frame 11. The drive assembly 5 is mounted on the mounting plate 12, and the fixed gear disc 51 is located at the bottom of the mounting plate 12. The fixed gear disc 51 and the mounting plate 12 are connected by bolts. The mounting plate 12 is fixed in the space above the mixing tank 1 by the support frame 11, and the fixed gear disc 51 is fixedly installed by bolts through the mounting plate 12. With the installed drive assembly 5, the speed-increasing gear 52 in the drive assembly 5 rotates around the fixed gear disc 51. Thus, the speed-increasing gear 52 can rotate at high speed while rotating around the fixed gear disc 51. The greater the diameter difference between the speed-increasing gear 52 and the fixed gear disc 51, the stronger the speed-increasing effect. This allows the negative pressure powder dispersing assembly 3 driven by the speed-increasing gear 52 to operate at high speed, while the stirring assembly 2 operates at low speed.

[0039] Furthermore, the driving assembly 5 also includes a driving motor 54, which is mounted above the mounting plate 12. The output end of the driving motor 54 is provided with a driving gear 541. A driving rod 55 is provided in the middle of the mixing tank 1. The driving rod 55 is a hollow tube. The atomizing assembly 4 is mounted on the driving rod 55. A transmission gear 551 is provided above the driving rod 55. The driving gear 541 meshes with the transmission gear 551. The driving motor 54 in the driving assembly 5 drives the driving gear 541 at its output end to mesh with the transmission gear 551, thereby driving the driving rod 55 to rotate. This, in turn, drives the atomizing assembly 4 to spray the atomized insulating coating agent into the mixing tank 1. The insulating coating agent is poured in from the top of the hollow tube driving rod 55. The driving gear 541 cooperates with the transmission gear 551 to connect the driving motor 54 and the driving rod 55, so that the insulating coating agent can be poured in from the top of the hollow tube driving rod 55.

[0040] Furthermore, a rotating ball 6 is provided at the center of the upper part of the mixing tank 1. The drive rod 55 is connected to the rotating ball 6 and extends into the mixing tank 1 to connect with the stirring assembly 2. The drive rod 55 passes through the mounting plate 12 and the fixed toothed disc 51, and the drive rod 55 is rotatably connected to both the mounting plate 12 and the fixed toothed disc 51. The drive rod 55 is fixedly connected to the synchronous drive frame 53. The drive rod 55 drives the synchronous drive frame 53 to rotate at the bottom of the fixed toothed disc 51. When the synchronous drive frame 53 rotates, it drives the speed-increasing gear 52 to roll around the fixed toothed disc 51. Since the speed-increasing gear 52 is meshed with the fixed toothed disc 51, the speed-increasing gear 52 rotates on its own while rolling, thereby driving the negative pressure powder dispersing assembly 3 to rotate at high speed in the mixing tank 1. At the same time, the drive rod 55 is rotatably connected to the mixing tank 1 through the rotating ball 6, so that the bottom of the drive rod 55 extends into the mixing tank 1 and drives the stirring assembly 2 to rotate and stir at low speed.

[0041] Further, the atomizing assembly 4 is mounted on the drive rod 55. The atomizing assembly 4 includes an inlet 41, a spray pipe 42, and an atomizer 43. The inlet 41 is rotatably disposed above the drive rod 55, and its bottom is connected to the drive rod 55. The spray pipe 42 is distributed along the circumferential tangent of the drive rod 55 and is located above the inner cavity of the mixing tank 1. The atomizer 43 is located at the end of the spray pipe 42, and the nozzle of the atomizer 43 faces the opposite direction to the rotation direction of the drive rod 55. The atomizer 43 passes through the inlet of the atomizing assembly 4. 41 connects to the hollow tubular drive rod 55, which pours the insulating coating agent into the mixing tank 1. The inlet 41 is connected to an external insulating coating agent supply device (this supply device is an existing structure and is not shown in the figure). The insulating coating agent enters the spray pipe 42 through the hollow tube inside the drive rod 55 and is then sprayed out by the atomizer 43. Since the spray pipe 42 is distributed along the circumferential tangential surface of the drive rod 55 and the nozzle of the atomizer 43 rotates in the opposite direction to the drive rod 55, the atomized insulating coating agent diffuses to the periphery under the rotation of the drive rod 55 and then comes into contact with the magnetic powder dispersed upward by the negative pressure powder assembly 3.

[0042] Further, one end of the speed-increasing gear 52 is connected to a drive shaft 521. The synchronous drive frame 53 includes a mounting cylinder 531, a diagonal rod 532, and a connecting cylinder 533. The mounting cylinder 531 is rotatably mounted on the upper end of the drive rod 55. The diagonal rods 532 are inclined downwards on both sides of the mounting cylinder 531, and each diagonal rod 532 is tangent to the outer edge of the mounting cylinder 531. The connecting cylinder 533 is located at the other end of the diagonal rods 532. The drive shaft 521 is rotatably connected to the diagonal rods 532. The two drive shafts 521 are inclined towards the center and intersected, with the intersection located at the position of the rotating ball 6. The drive shaft 521 passes through the rotating ball 6 and extends into the mixing tank 1, connecting to the negative pressure powder dispersing assembly 3. The drive shaft 521 is rotatably connected to the rotating ball 6. When the speed-increasing gear 52 rotates along the fixed gear disk 51, the drive shaft 521 connected at one end rotates at high speed. Since the inclined rod 532 is inclined downward on both sides of the mounting cylinder 531 and the inclined rod 532 is tangent to the outer circle of the mounting cylinder 531, and the drive shaft 521 located inside the cylinder 533 at the other end of the inclined rod 532 is inclined to cross in the middle, the drive shaft 521 is on both sides of the drive rod 55 (that is, the drive shaft 521 is in a crossed state, but the crossing point is not connected, as shown in Figure A). Thus, while the drive shaft 521 passes through the rotating ball 6, it rotates inside the rotating ball 6, ensuring that the drive shaft 521 can rotate on its own and can also follow the rotating ball 6 and the drive rod 55 to revolve (that is, ensuring that the negative pressure powder dispersing component 3 is inclined at the bottom of the mixing tank 1 and rotates at high speed, while following the stirring component 2 in the middle of the mixing tank 1 to revolve at a slow speed).

[0043] Furthermore, the stirring assembly 2 includes a gathering lever 21 and a stirring blade 22. The gathering lever 21 is located at the bottom of the mixing tank 1, and the stirring blade 22 is located above the gathering lever 21. The stirring blade 22 is connected to the drive rod 55, and the surface of the stirring blade 22 is provided with a discharge hole 23. Under the drive of the drive rod 55, the gathering lever 21 in the stirring assembly 2 gathers the coating agent mixture that falls from the bottom of the mixing tank 1 to the middle of the mixing tank 1. The gathered coating agent mixture is turned upside down by the stirring blade 22. Then, under the stirring of the stirring blade 22 with the discharge hole 23, part of the coating agent mixture passes through the discharge hole 23, and the other part turns upside down, so that the coating agent mixture can be better mixed, so that the magnetic powder that is not completely coated with the insulating layer can be re-coated with the insulating layer.

[0044] Furthermore, the gathering lever 21 is tangentially connected to the drive rod 55 around its periphery. The gathering lever 21 is bent in the same direction as the rotation of the drive rod 55. The stirring blade 22 is tilted in the opposite direction to the rotation of the drive rod 55. When the stirring blade 22 rotates, the material is pushed upwards by the stirring blade 22. The gathering lever 21 is bent (preferably arc-shaped) at a position tangential to the periphery of the drive rod 55. When the drive rod 55 rotates, the gathering lever 21 rotates at the bottom of the mixing tank 1, gathering the coating agent mixture at the bottom of the mixing tank 1 towards the center. The stirring blade 22 is tilted in the opposite direction to the rotation of the drive rod 55. When the stirring blade 22 rotates, it further flips the gathered coating agent mixture upwards.

[0045] Further, the negative pressure powder dispersing assembly 3 includes a negative pressure cylinder 31, a negative pressure paddle 32, and a conical auger 33. The negative pressure paddle 32 is connected to the drive shaft 521. The negative pressure cylinder 31 is sleeved on the outside of the negative pressure paddle 32, and a connecting rod 34 is provided between two negative pressure cylinders 31 symmetrically arranged along the drive rod 55. The conical auger 33 is located at the bottom of the negative pressure paddle 32, and the bottom of the conical auger 33 is directly opposite the angle between the side wall and the bottom of the mixing tank 1. The connecting rod 34 passes through the drive rod 55 and is fixedly connected to the drive rod 55. A suction hole 35 is opened at the bottom of the outer side of the negative pressure cylinder 31. Both the upper and lower ends of the negative pressure cylinder 31 are connected to the mixing tank 1. Under the drive of the drive shaft 521, the negative pressure paddle 32 and the conical auger 33 in the negative pressure powder dispersing assembly 3 move along the bottom of the inner periphery of the mixing tank 1 with the stirring assembly 2. While rotating, the conical auger 33 also rotates on its own axis. When the conical auger 33 rotates, it turns the magnetic powder mixture in the mixing tank 1 upward, preventing the magnetic powder mixture from remaining in the dead corners of the mixing tank 1 and causing it to leave the bottom of the inner cavity of the mixing tank 1. At the same time, the negative pressure blade 32 rotates inside the negative pressure cylinder 31, generating a negative pressure suction force inside the negative pressure cylinder 31. The suction holes 35 at the bottom and outer bottom of the negative pressure cylinder 31 suck the magnetic powder scattered inside the mixing tank 1 and the magnetic powder mixture turned over by the conical auger 33 at the bottom of the mixing tank 1 into the negative pressure cylinder 31. Then, it is sprayed obliquely upward from the top of the negative pressure cylinder 31, spraying the magnetic powder around the atomizing component 4, so that the magnetic powder comes into contact with the atomized coating agent. The negative pressure cylinders 31 on both sides are fixedly connected to the drive rod 55 through the connecting rod 34, so that the negative pressure cylinder 31 is in a relatively "fixed" state. Then, the negative pressure blade 32 can rotate inside the negative pressure cylinder 31 under the drive of the drive shaft 521.

[0046] A coating method for processing soft magnetic powder cores, employing the aforementioned magnetic powder coating equipment.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic powder coating device, characterized in that: The system includes a mixing tank (1), a stirring assembly (2) is provided inside the mixing tank (1), the stirring assembly (2) is located in the middle of the inner cavity of the mixing tank (1), a negative pressure powder dispersing assembly (3) is provided around the stirring assembly (2), the negative pressure powder dispersing assembly (3) is inclinedly arranged around the inner cavity of the mixing tank (1), an atomizing assembly (4) is provided at the top of the inner cavity of the mixing tank (1), and a driving assembly (5) is provided above the mixing tank (1). The driving assembly (5) includes a fixed gear disc (51) and a speed increaser. The gear (52) and the synchronous drive frame (53) are connected. The stirring assembly (2) is connected to the synchronous drive frame (53). The synchronous drive frame (53) is rotatably mounted on the bottom of the fixed gear plate (51). The speed-increasing gear (52) is rotatably mounted on the synchronous drive frame (53) and meshes with the fixed gear plate (51). The negative pressure powder dispersing assembly (3) is connected to the speed-increasing gear (52). The atomizing assembly (4) is connected to the drive assembly (5). The speed-increasing gear (52) is connected to a drive shaft (521) at one end. The synchronous drive frame (53) includes a mounting cylinder (531), a slant rod (532), and a connecting cylinder (533). The mounting cylinder (531) is rotatably mounted on the upper end of the drive shaft (521). The slant rod (532) is inclined downward on both sides of the mounting cylinder (531), and each slant rod (532) is tangent to the outer edge of the mounting cylinder (531). The connecting cylinder (533) is located at the other end of the slant rod (532). The drive shaft (521) is rotatably connected to the slant rod (532). The two drive shafts (521) are inclined and intersected towards the middle, and the intersection is located at the position of the rotating ball (6). The drive shaft (521) passes through the rotating ball (6) and extends into the mixing tank (1) and is connected to the negative pressure powder assembly (3). The drive shaft (521) is rotatably connected to the rotating ball (6). The atomizing component (4) is mounted on the drive rod (55). The atomizing component (4) includes a feed inlet (41), a spray pipe (42), and an atomizer (43). The feed inlet (41) is rotatably disposed above the drive rod (55), and the bottom of the feed inlet (41) is connected to the drive rod (55). The spray pipe (42) is distributed along the circumferential tangent of the drive rod (55), and the spray pipe (42) is located above the inner cavity of the mixing tank (1). The atomizer (43) is located at the end of the spray pipe (42), and the nozzle of the atomizer (43) faces the opposite direction to the rotation direction of the drive rod (55). The negative pressure powder assembly (3) includes a negative pressure cylinder (31), a negative pressure blade (32), and a conical auger (33). The negative pressure blade (32) is connected to the drive shaft (521). The negative pressure cylinder (31) is sleeved on the outside of the negative pressure blade (32), and a connecting rod (34) is provided between two negative pressure cylinders (31) symmetrical along the drive rod (55). The conical auger (33) is located at the bottom of the negative pressure blade (32), and the bottom of the conical auger (33) is directly opposite to the angle between the side wall and the bottom of the mixing tank (1). The connecting rod (34) passes through the drive rod (55) and is fixedly connected to the drive rod (55). A suction hole (35) is opened at the bottom of the outer side of the negative pressure cylinder (31). Both the upper and lower ends of the negative pressure cylinder (31) are connected to the mixing tank (1).

2. The magnetic powder coating equipment according to claim 1, characterized in that, A stand (11) is provided on one side of the mixing tank (1), and an mounting plate (12) is provided above the stand (11). The drive assembly (5) is installed on the mounting plate (12), and the fixed gear plate (51) is located at the bottom of the mounting plate (12). The fixed gear plate (51) is connected to the mounting plate (12) by bolts.

3. The magnetic powder coating equipment according to claim 2, characterized in that, The drive assembly (5) also includes a drive motor (54), which is mounted above the mounting plate (12). The output end of the drive motor (54) is provided with a drive gear (541). A drive rod (55) is provided in the middle of the mixing tank (1). The drive rod (55) is a hollow tube. The atomizing assembly (4) is mounted on the drive rod (55). A transmission gear (551) is provided above the drive rod (55). The drive gear (541) meshes with the transmission gear (551).

4. The magnetic powder coating equipment according to claim 3, characterized in that, A rotating ball (6) is provided at the upper center of the mixing tank (1). The drive rod (55) is connected to the rotating ball (6) and extends into the mixing tank (1) and is connected to the stirring assembly (2). The drive rod (55) passes through the mounting plate (12) and the fixed toothed disc (51), and the drive rod (55) is rotatably connected to the mounting plate (12) and the fixed toothed disc (51). The drive rod (55) is fixedly connected to the synchronous drive frame (53).

5. The magnetic powder coating equipment according to claim 3, characterized in that, The stirring assembly (2) includes a gathering lever (21) and a stirring blade (22). The gathering lever (21) is located at the bottom of the mixing tank (1), and the stirring blade (22) is located above the gathering lever (21). The stirring blade (22) is connected to the drive rod (55), and the surface of the stirring blade (22) is provided with a material discharge hole (23).

6. The magnetic powder coating equipment according to claim 5, characterized in that, The gathering lever (21) is tangentially connected to the drive rod (55) around its periphery. The gathering lever (21) is bent, and the bending direction is the same as the rotation direction of the drive rod (55). The stirring blade (22) is tilted in the opposite direction to the rotation direction of the drive rod (55). When the stirring blade (22) rotates, the material is subjected to an upward thrust from the stirring blade (22).

7. A coating method for processing soft magnetic powder cores, characterized in that, The magnetic powder coating equipment described in any one of claims 1-6 is used.

Images