Multi-stage powder grinding device for metal soft magnetic powder

Abstract

The utility model discloses a multi-stage powder grinding device for metal soft magnetic powder, and relates to the technical field of metal soft magnetic powder. The multi-stage powder grinding device comprises an outer cylinder, a transmission shaft is assembled at the position of the inner central axis of the outer cylinder, and a driving motor connected with the bottom of the transmission shaft is assembled on the outer cylinder; three groups of rolling assemblies for rolling metal soft magnetic powder are arranged on the outer wall of the transmission shaft at equal intervals; each rolling assembly comprises a bearing disc arranged on the outer wall of the transmission shaft in a sleeving mode, and a conical screen attached to the inner wall of the outer cylinder is arranged at the position, close to the edge, of the top of each bearing disc. According to the metal soft magnetic powder crushing device, metal soft magnetic powder passes through the conical screen to be split through the grinding assembly, the grinding effect of the metal soft magnetic powder is more comprehensive along with the multiple crushing effect of the grinding roller and the scraper, meanwhile, the conical screen can be driven to vibrate up and down, the screening efficiency of the cluster powder can be improved, and the service life of the metal soft magnetic powder is prolonged. And meanwhile, cluster powder is prevented from blocking the conical screen, and it is ensured that the grinding efficiency of the device on the metal soft magnetic powder is high.

Description

Technical Field

[0001] This utility model relates to the field of metal soft magnetic powder technology, specifically a multi-stage grinding device for metal soft magnetic powder. Background Technology

[0002] Metal soft magnetic powder cores are composite materials obtained by pressing metal soft magnetic powder and insulating material together using a press. They have excellent properties such as high saturation magnetic flux density, low coercivity, low magnetostriction coefficient and low loss, and are widely used in photovoltaic inverters, charging piles, automotive electronics and other fields. They can meet the needs of the development trend of electronic devices with high frequency, high power and miniaturization.

[0003] Metal soft magnetic powder cores are obtained by pressing soft magnetic powder into shape using a press. To reduce unreasonable losses of the soft magnetic powder cores during the molding process, the soft magnetic powder is often pre-insulated before pressing. This involves modifying the powder surface to form an insulating layer, preventing direct contact between magnetic powder particles. This insulating layer on the surface of the soft magnetic powder effectively isolates eddy current paths between particles during the operation of electrical devices, significantly reducing energy consumption and improving energy efficiency.

[0004] During the insulating coating process of soft magnetic powder, improper storage (humid environment) can lead to the formation of powder clusters due to adhesion and agglomeration. These powder clusters cannot be properly pressed and formed in the press. Therefore, after the soft magnetic powder is insulatingly coated, it needs to be sieved to remove powder clusters that are too large. This is especially true in the production of low permeability metal soft magnetic powder cores. To ensure the low permeability of the metal soft magnetic powder cores, the proportion of insulating material needs to be further increased during the soft magnetic powder coating process, which makes it easier for powder clusters to form. This problem is particularly prominent in the production of low permeability metal soft magnetic powder cores. To address this, a multi-stage grinding device for metal soft magnetic powder is proposed. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a multi-stage grinding device for soft magnetic metal powder, so as to solve the technical problem mentioned in the background that the sieving of soft magnetic metal powder agglomerates affects subsequent insulation coating.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage grinding device for soft magnetic metal powder, comprising an outer cylinder, a drive shaft mounted on the inner central axis of the outer cylinder, a drive motor connected to the bottom of the drive shaft mounted on the outer cylinder, and three sets of grinding components for grinding soft magnetic metal powder evenly spaced on the outer wall of the drive shaft.

[0007] Each set of the rolling assembly includes a load-bearing disc sleeved on the outer wall of the drive shaft. A conical screen that fits against the inner wall of the outer cylinder is provided at the top edge of the load-bearing disc. A driven sleeve that is fixedly sleeved on the outer wall of the drive shaft is provided at the center of the load-bearing disc. A rolling roller for rolling soft magnetic metal powder is mounted on the outer wall of the driven sleeve at the top of the load-bearing disc. A scraper for pushing the soft magnetic metal powder is fixed on the opposite side of the rolling roller on the outer wall of the driven sleeve. Two sets of crossbars for driving the conical screen to vibrate up and down are fixed on the outer wall of the driven sleeve below the load-bearing disc.

[0008] As a preferred technical solution, a connector is fixed to the lower surface of the conical screen, and a ball head rod is fixed to the bottom of the connector. A constraint frame fixed to the inner wall of the outer cylinder is sleeved on one end of the connector. A spring that assists the connector in vibrating up and down is installed in the constraint frame. An inclined block that compresses the ball head rod to raise it is fixed to the top of the crossbar.

[0009] As a preferred technical solution, a top cover is fixed to the top of the outer cylinder, and a feed hopper is reserved at the center of the top of the top cover.

[0010] As a preferred technical solution, a conical top plate is movably sleeved on the outer wall of the transmission shaft above the load-bearing plate. Multiple flow plates are fixed in a ring array on the inclined surface of the conical top plate, and multiple positioning rods connected to the conical screen are fixed at the bottom of the conical top plate.

[0011] As a preferred technical solution, a guide cone is fixed inside the outer cylinder on the outside of the drive motor, and a positioning plate connected to the guide cone is fixed on the top of the outer cylinder.

[0012] As a preferred technical solution, the top of each of the three sets of load-bearing plates is provided with a discharge port, and the three sets of discharge ports are arranged in a staggered manner.

[0013] As a preferred technical solution, a guide cone disk is provided below the upper and middle load-bearing disk and fixed to the inner wall of the outer cylinder. The guide cone disk is movably sleeved on the outer wall of the drive shaft, and there is a space for vibration between the guide cone disk and the lower diverter plate.

[0014] In summary, the present invention has the following main advantages:

[0015] This invention uses a crushing component to break down clustered metal soft magnetic powder through a conical screen. The crushing roller and scraper perform multiple crushing processes, resulting in a more comprehensive crushing effect for the metal soft magnetic powder. At the same time, the conical screen vibrates up and down, which can accelerate the sieving efficiency of clustered powder and prevent clustered powder from clogging the conical screen, ensuring that the device has a high crushing efficiency for metal soft magnetic powder. Attached Figure Description

[0016] Figure 1This is a perspective view of the present utility model;

[0017] Figure 2 This is a three-dimensional sectional view of the present invention;

[0018] Figure 3 This is a schematic diagram of the unfolded structure of the crushing component of this utility model;

[0019] Figure 4 A bottom view of the compaction assembly of this utility model;

[0020] Figure 5 This is a cross-sectional view of part of the compaction assembly and outer cylinder of this utility model;

[0021] Figure 6 For the present utility model Figure 4 Enlarged view of point A in the middle.

[0022] In the diagram: 100, outer cylinder; 200, compaction assembly;

[0023] 110. Top cover; 120. Drive motor; 130. Guide cone; 140. Drive shaft; 150. Positioning plate;

[0024] 210. Loading plate; 211. Discharge port; 220. Conical screen; 230. Driven sleeve; 231. Roller; 232. Scraper; 233. Crossbar; 234. Inclined block; 240. Conical top plate; 241. Diverter plate; 250. Guide cone; 260. Connector; 261. Ball head rod; 270. Constraint frame; 271. Spring. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The embodiments of this utility model will be described below based on its overall structure.

[0027] A multi-stage grinding device for soft magnetic metal powder, such as Figures 1 to 6 As shown, it includes an outer cylinder 100, a drive shaft 140 is mounted on the inner central axis of the outer cylinder 100, a drive motor 120 connected to the bottom of the drive shaft 140 is mounted on the outer cylinder 100, and three sets of crushing components 200 for crushing soft magnetic metal powder are provided at equal intervals on the outer wall of the drive shaft 140.

[0028] Each set of crushing components 200 includes a bearing plate 210 sleeved on the outer wall of the drive shaft 140. A conical screen 220 is provided at the top edge of the bearing plate 210 and is in contact with the inner wall of the outer cylinder 100. A driven sleeve 230 is fixedly sleeved on the outer wall of the drive shaft 140 at the center of the bearing plate 210. A crushing roller 231 for crushing soft magnetic metal powder is mounted on the outer wall of the driven sleeve 230 at the top of the bearing plate 210. A scraper 232 for pushing soft magnetic metal powder is fixed on the opposite side of the crushing roller 231 at the outer wall of the driven sleeve 230. Two sets of crossbars 233 for driving the conical screen 220 to vibrate up and down are fixed on the outer wall of the driven sleeve 230 at the bottom of the bearing plate 210.

[0029] A connector 260 is fixed to the lower surface of the conical screen 220, and a ball head rod 261 is fixed to the bottom of the connector 260. A constraint frame 270 fixed to the inner wall of the outer cylinder 100 is sleeved on one end of the connector 260. A spring 271 that assists the connector 260 in vibrating up and down is installed inside the constraint frame 270. A ramp block 234 that compresses the ball head rod 261 to raise is fixed to the top of the crossbar 233.

[0030] A conical top plate 240 is movably sleeved on the outer wall of the drive shaft 140 above the load-bearing plate 210. Multiple diverter plates 241 are fixed in a ring array on the inclined surface of the conical top plate 240. Multiple positioning rods 242 connected to the conical screen 220 are fixed at the bottom of the conical top plate 240.

[0031] When the soft magnetic metal powder enters the outer cylinder 100, it first falls to the center of the conical top plate 240 and flows towards the edge. The diverter plate 241 divides the soft magnetic metal powder, causing it to fall in a ring shape onto the surface of the lower conical screen 220. Because the conical screen 220 is inclined, the granular soft magnetic metal powder will fall through the conical screen 220, while the clustered soft magnetic metal powder will roll onto the top of the bearing plate 210 on the inclined surface of the flue gas. At this time, the drive motor 120 drives the transmission shaft 140 to rotate, and the external driven sleeve 230 rotates accordingly, causing the crushing roller 2... 31 crushes the cluster of soft magnetic metal powder at the top of the bearing plate 210. The scraper 232 following behind pushes the crushed soft magnetic metal powder, causing it to fall through the feed port 211 to the bottom. The soft magnetic metal powder that has not been crushed enough can be screened. The crushed soft magnetic metal powder will fall through the conical screen 220 to the bottom. The powder that has not been crushed will continue to roll to the top of the bearing plate 210 and be crushed again by the crushing roller 231. This crushing is repeated so that the soft magnetic metal powder entering the outer cylinder 100 is crushed.

[0032] When the driven sleeve 230 rotates with the drive shaft 140, the two sets of crossbars 233 on the outer wall rotate synchronously. The bottom ramp block 234 will intermittently contact the ball head rod 261 and generate an upward lifting force on it. The connecting piece 260 will drag the conical screen 220 upward and cooperate with the spring 271 in its constraint frame 270 to make the conical screen 220 vibrate back and forth. This can accelerate the separation of clustered powder in the soft magnetic powder and promote the dislodgement of clustered powder stuck in the mesh, thereby avoiding the conical screen 220 from clogging and affecting the overall working efficiency.

[0033] Please refer to this carefully. Figure 1 The top of the outer cylinder 100 is fixed with a top cover 110, and a feed hopper is reserved at the center of the top of the top cover 110.

[0034] The soft magnetic metal powder entering the outer cylinder 100 is positioned at the center of the cone top plate 240 via the feed hopper, thus expanding outwards towards the edge.

[0035] Please refer to this carefully. Figure 2 and Figure 5 A guide cone 130 is fixed inside the outer cylinder 100 outside the drive motor 120, and a positioning disk 150 connected to the guide cone 130 is fixed on the top of the outer cylinder 100.

[0036] The positioning disk 150 positions the drive motor 120, enabling it to stably drive the transmission shaft 140 to rotate, while the crushed soft magnetic metal powder can be discharged through the guide cone 130.

[0037] Please refer to this carefully. Figure 2 Each of the three sets of load-bearing plates 210 has a discharge port 211 at its top, and the three discharge ports 211 are arranged in a staggered manner.

[0038] This prevents the clustered soft magnetic metal powder from flowing directly to the bottom of the outer cylinder 100, thus ensuring that the soft magnetic metal powder entering the outer cylinder 100 is thoroughly crushed.

[0039] Please refer to this carefully. Figure 2 Below the upper and middle load-bearing plate 210, there is a guide cone 250 fixed to the inner wall of the outer cylinder 100. The guide cone 250 is movably sleeved on the outer wall of the drive shaft 140. There is a space for vibration between the guide cone 250 and the lower diverter plate 241.

[0040] The soft magnetic metal powder falling from the upper layer is guided to fall to the top center of the lower cone plate 240, driving the soft magnetic metal powder to flow evenly to the cone screen 220 for filtration. At the same time, the guide cone 250 does not affect the up-and-down vibration effect of the lower cone screen 220.

[0041] In use, when the soft magnetic metal powder enters the outer cylinder 100, it first falls to the center of the cone top plate 240 and flows towards the edge. The diverter plate 241 divides the soft magnetic metal powder, causing it to fall in a ring shape onto the surface of the cone-shaped screen 220 below. Because the cone-shaped screen 220 is inclined, the soft magnetic metal powder particles fall through the cone-shaped screen 220, while the clustered soft magnetic metal powder rolls onto the top of the bearing plate 210 on the inclined surface of the flue gas. At this time, the drive motor 120 drives the transmission shaft 140 to rotate, and the external driven sleeve 230 rotates accordingly, causing the crushing... Roller 231 crushes the cluster of soft magnetic metal powder located at the top of the bearing plate 210. The scraper 232 following behind pushes the crushed soft magnetic metal powder, causing it to fall through the feed port 211 to the bottom. The soft magnetic metal powder that has not been crushed can be screened. The crushed soft magnetic metal powder will fall through the conical screen 220 to the bottom. The powder that has not been crushed will continue to roll to the top of the bearing plate 210 and be crushed again by the crushing roller 231. This crushing is repeated so that the soft magnetic metal powder entering the outer cylinder 100 is crushed.

[0042] When the driven sleeve 230 rotates with the drive shaft 140, the two sets of crossbars 233 on the outer wall rotate synchronously. The bottom ramp block 234 will intermittently contact the ball head rod 261 and generate an upward lifting force on it. The connecting piece 260 will drag the conical screen 220 upward and cooperate with the spring 271 in its constraint frame 270 to make the conical screen 220 vibrate back and forth. This can accelerate the separation of agglomerated powder in the soft magnetic powder and promote the agglomerated powder stuck in the mesh to fall off, thereby avoiding the conical screen 220 from clogging and affecting the overall working efficiency. The parts not mentioned in this device are the same as or can be implemented using existing technology.

[0043] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A multi-stage powder milling device for a metal soft magnetic powder, comprising an outer cylinder (100), characterized in that: The inner central axis of the outer cylinder (100) is equipped with a transmission shaft (140), the outer cylinder (100) is equipped with a driving motor (120) connected with the bottom of the transmission shaft (140), and the outer wall of the transmission shaft (140) is equidistantly provided with three groups of rolling components (200) made of rolling metal soft magnetic powder. Each group of the rolling components (200) comprises a bearing disc (210) sleeved on the outer wall of the transmission shaft (140), the top of the bearing disc (210) is provided with a conical screen (220) abutting against the inner wall of the outer cylinder (100), the center of the bearing disc (210) is provided with a driven sleeve (230) fixedly sleeved on the outer wall of the transmission shaft (140), the outer wall of the driven sleeve (230) at the top of the bearing disc (210) is equipped with a rolling roller (231) for rolling the metal soft magnetic powder, the opposite surface of the rolling roller (231) is fixed with a scraper (232) for pushing the metal soft magnetic powder on the outer wall of the driven sleeve (230), and the outer wall of the driven sleeve (230) below the bearing disc (210) is fixed with two groups of cross bars (233) for driving the conical screen (220) to vibrate up and down.

2. A multi-stage powder milling device for a metal soft magnetic powder according to claim 1, characterized in that: The lower surface of the conical screen (220) is fixed with a connecting piece (260), the bottom of the connecting piece (260) is fixed with a ball head rod (261), one end of the connecting piece (260) is sleeved with a constraint frame (270) fixed on the inner wall of the outer cylinder (100), the constraint frame (270) is equipped with a spring (271) for assisting the connecting piece (260) to vibrate up and down, and the top of the cross bar (233) is fixed with an inclined block (234) for extruding the ball head rod (261) to rise.

3. A multi-stage powder milling device for a metal soft magnetic powder according to claim 1, characterized in that: The top of the outer cylinder (100) is fixed with a top cover (110), and the top center of the top cover (110) is reserved with a feeding hopper.

4. A multi-stage powder milling device for a metal soft magnetic powder according to claim 1, characterized in that: The outer wall of the transmission shaft (140) above the bearing disc (210) is movably sleeved with a conical top plate (240), the inclined surface of the conical top plate (240) is fixed with a plurality of groups of distribution plates (241) in an annular array, and the bottom of the conical top plate (240) is fixed with a plurality of groups of positioning rods (242) connected with the conical screen (220).

5. A multi-stage powder milling device for a metal soft magnetic powder according to claim 1, characterized in that: The outer side of the driving motor (120) in the inner of the outer cylinder (100) is fixed with a flow guide cone (130), and the top of the outer cylinder (100) is fixed with a positioning disc (150) connected with the flow guide cone (130).

6. A multi-stage powder milling device for a metal soft magnetic powder according to claim 1, characterized in that: The top of each of the three groups of bearing discs (210) is provided with a discharging port (211), and the three groups of discharging ports (211) are arranged in a staggered manner.

7. A multi-stage powder milling device for a metal soft magnetic powder according to claim 1, characterized in that: The lower side of the bearing disc (210) in the middle and upper layer is provided with a flow guide cone disc (250) fixed on the inner wall of the outer cylinder (100), the flow guide cone disc (250) is movably sleeved on the outer wall of the transmission shaft (140), and the flow guide cone disc (250) and the lower distribution plate (241) have a vibrating space.

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