Accurate grinding device and method for soft magnetic core

Abstract

The invention discloses a fine grinding device and method for a soft magnetic core, and belongs to the technical field of magnetic material processing. The device comprises a driving mechanism, a rotating shaft and a polishing mechanism coaxially fixed to the top end of the rotating shaft. The polishing mechanism is of a modular splicing structure and is composed of a center column, a plurality of polishing blocks and a cover cap. An inserting opening is formed in the center column, the grinding block is inserted into the inserting opening through an arc-shaped inserting strip with threads at the end, a hollow cylindrical structure with external threads is formed in a splicing mode, and the cover cap is screwed outside the structure to achieve axial locking. The device is further provided with a rigid hoop used for radial fixing, fan blades are integrated in the gaps between the adjacent grinding blocks, and suction airflow from bottom to top is generated through rotation so as to take away grinding heat. The grinding device is matched with the double-station magnetic conveying belt to work, the method of adjusting the height of the grinding block in a central symmetry mode is adopted, the dynamic balance stability under high-speed rotation is ensured while different grinding requirements are met, and the grinding device has the advantages of being good in heat dissipation, high in precision, low in maintenance cost and the like.

Description

Technical Field

[0001] This invention belongs to the field of magnetic material processing technology, specifically relating to a fine grinding device and method for soft magnetic cores. Background Technology

[0002] Soft magnetic cores (such as ferrite cores) are widely used in electronic components such as electronic transformers and inductors. In the production process of magnetic cores, precision grinding is a crucial step to ensure the dimensional accuracy and surface flatness of the cores.

[0003] Existing magnetic core grinding devices typically use a single, integral grinding wheel or disc. This traditional structure has the following drawbacks: First, soft magnetic materials are usually brittle and hard, generating a large amount of heat during grinding. The integral grinding disc structure is enclosed, resulting in poor heat dissipation. Heat easily accumulates in the grinding area, causing localized overheating of the magnetic core, which can lead to core cracking or a decrease in magnetic properties (such as reduced permeability). Second, once a single grinding disc experiences severe localized wear or chipping, the entire disc often needs to be replaced, resulting in high maintenance costs and wasted resources. Furthermore, to meet the different grinding requirements at different stages (such as rough grinding, semi-fine grinding, and fine grinding), grinding discs of different grit sizes are usually required, making the disassembly and assembly process cumbersome and reducing production efficiency.

[0004] Furthermore, during high-speed precision grinding, the dynamic balance of the grinding disc directly affects machining accuracy. Traditional assembled grinding heads often experience center of gravity shifts due to improper adjustment, causing spindle vibration and resulting in ripples on the magnetic core surface, thus affecting product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a fine grinding device and method for soft magnetic cores to solve the problems of poor heat dissipation of grinding discs, high maintenance costs and difficulty in controlling dynamic balance in the prior art.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a fine grinding device for a soft magnetic core, used for fine grinding a soft magnetic core on a conveyor belt, comprising: Shaft; A drive mechanism for driving the rotating shaft to rotate at high speed; and A grinding mechanism, which is coaxially fixedly mounted on the top end of the rotating shaft; The polishing mechanism includes a central column, multiple polishing blocks, and a cover. The central column is fixed on the rotating shaft, and multiple insertion ports are arranged in a ring array on the central column and penetrated along the axial direction. Each of the grinding blocks has a vertically inserted strip at its end, and each grinding block is inserted into the slot from bottom to top through the inserted strip; Each of the inserts is arc-shaped and has threads on its outer side wall. When all the grinding blocks are inserted into place, all the inserts together form a hollow cylindrical structure with threads on the outer side at the center of the central column. The cover is cylindrical and has threads on its inner wall. The cover is threaded to the outside of the hollow cylindrical structure and axially locks all the grinding blocks to the central column.

[0007] Furthermore, the grinding mechanism also includes a rigid hoop, which comprises two semi-circular C-shaped structures. The two C-shaped structures can be enclosed to form a closed loop and locked to the outer circumferential sidewalls of all the grinding blocks by fasteners, providing radial convergence and fixing force for each grinding block.

[0008] Furthermore, the polishing mechanism also includes multiple fan blades, which are disposed on the outer wall of the central column, and each fan blade is located in the gap between two adjacent polishing blocks; the tilt angle of the fan blades is configured such that when the polishing mechanism rotates, the fan blades generate a suction airflow from bottom to top, drawing heat from the working area below the polishing mechanism upwards.

[0009] Furthermore, the grinding block has a fan-shaped structure that is wide at one end and narrow at the other, and the insert is vertically set at its narrower end; when each of the grinding blocks is installed in place, the wider end of each grinding block is arc-shaped and the axis coincides, and the whole assembly forms a hollow disc-shaped structure.

[0010] Furthermore, the conveyor belt is located directly below the polishing mechanism, and the conveyor belt is provided with a magnetic suction component for attracting the magnetic core; the conveyor belt is configured as a dual-station structure, with two conveyor belts arranged parallel to each other on both sides of the rotating shaft; the surface of the conveyor belt is provided with a limiting strip with a height lower than the thickness of the magnetic core, which is used to cooperate with the magnetic suction component to fix the magnetic core.

[0011] Furthermore, it also includes a mounting bracket and a bearing housing mounted on the mounting bracket, with the rotating shaft rotatably connected within the bearing housing; the drive mechanism includes a drive motor, a drive pulley, a transmission belt, and a driven pulley; the drive motor is mounted on one side of the mounting bracket, the drive pulley is connected to the output shaft of the drive motor, the driven pulley is mounted on the bottom of the rotating shaft, and the transmission belt is respectively sleeved on the drive pulley and the driven pulley.

[0012] Furthermore, two handles for applying a screwing torque are symmetrically arranged on the outer side wall of the cover.

[0013] Furthermore, it also includes an automatic feeding system, which is set at the beginning of the conveyor belt used to transport the magnetic cores to be ground; the automatic feeding system includes a vibratory feeder, a linear vibrating track and a transfer robot, the vibratory feeder is used to arrange the magnetic cores in a uniform posture, and the transfer robot is used to grab the magnetic cores at the end of the linear vibrating track and place them between the limiting strips of the conveyor belt.

[0014] The present invention also provides a method for using the above-mentioned fine grinding apparatus for soft magnetic cores, comprising the following steps: S1: Start the drive mechanism to drive the grinding mechanism to rotate at high speed; S2: The magnetic core to be ground is conveyed to the bottom of the grinding mechanism for grinding; The method also includes a grinding block adjustment step: When it is necessary to adjust the grinding depth or replace grinding blocks with different grits, loosen the cover, select at least two grinding blocks that are centrally symmetrically distributed as a working group, and simultaneously adjust the grinding blocks in the working group downwards to the same working height, ensuring that the working height is lower than the height of the other grinding blocks. After adjustment, tighten the cover to ensure that the grinding mechanism maintains dynamic balance with its center of gravity on the axis of rotation during operation.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By incorporating modular grinding blocks with inserts, along with a matching center post and threaded cover, a modular assembly structure for the grinding disc is achieved. This structure allows for the replacement of only a single module when a grinding block becomes worn or damaged, rather than replacing the entire grinding disc, significantly reducing consumable costs and maintenance expenses. Simultaneously, the threaded cover provides reliable axial locking force, ensuring the vertical stability of the grinding blocks.

[0016] 2. By installing fan blades in the gap between adjacent grinding blocks and configuring the fan blades to generate an upward suction airflow, the large amount of heat and water vapor accumulated in the grinding area can be actively and quickly drawn upward when the grinding mechanism rotates at high speed. This "self-cooling" structure effectively avoids cracking or performance degradation of the soft magnetic core due to local overheating, while also reducing dust accumulation in the grinding area and improving processing quality.

[0017] 3. By setting a rigid hoop composed of two C-shaped structures, a radial converging force is applied to the outer circumference of the grinding block. This rigid hoop, together with the axially locked cover, forms a double fixing mechanism, effectively resisting the centrifugal force generated by high-speed rotation, preventing the grinding block from loosening or being thrown out, and ensuring the safety and structural rigidity of the device under high-speed operating conditions.

[0018] 4. By employing a centrally symmetrical grinding block adjustment method, when it is necessary to change the grinding grit or fine-tune the grinding depth, the centrally symmetrically distributed grinding blocks are required to be adjusted synchronously. This method eliminates the quality eccentricity problem caused by unilateral adjustment from a process perspective, ensuring that the grinding mechanism always maintains a good dynamic balance, thereby avoiding spindle vibration and ensuring the fine grinding flatness of the magnetic core surface.

[0019] 5. By setting up a dual-station conveyor belt and using magnetic components and limiting strips to fix the magnetic core, the linear velocity areas on both sides of the circular grinding disc can be fully utilized for simultaneous processing, significantly improving production efficiency compared to single-sided grinding. At the same time, the combination of magnetic attraction and limiting strips ensures that the lightweight and brittle magnetic core does not shift or fly away during the grinding process.

[0020] 6. Flexible configuration of grinding processes is possible. Thanks to the independent modular design of the grinding blocks, this invention allows for the assembly of grinding blocks of different grit sizes on the same central column. Through the aforementioned height adjustment function, users can quickly adapt to different fine grinding stages without changing the grinding disc or disassembling the equipment, by raising and lowering the grinding block groups of different grit sizes (for example, lowering the low-grit blocks for rough grinding and then lowering the high-grit blocks for fine grinding). This greatly improves the versatility of the equipment and the continuity of production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the fine grinding device for a soft magnetic core according to the present invention. Figure 2 This is a three-dimensional structural diagram of the drive mechanism and mounting bracket in this invention; Figure 3 This is a schematic diagram of the overall three-dimensional structure of the grinding mechanism in this invention; Figure 4 This is a three-dimensional structural diagram of the central column of the grinding mechanism in this invention; Figure 5 This is a three-dimensional structural diagram of the grinding block and its connecting structure in this invention; Figure 6 This is an exploded structural diagram of the grinding mechanism in this invention.

[0022] In the diagram: 1. Drive motor; 2. Drive pulley; 3. Transmission belt; 4. Driven pulley; 5. Shaft; 6. Bearing housing; 7. Mounting bracket; 8. Grinding mechanism; 801. Center column; 8011. Insert; 802. Grinding block; 8021. Insert strip; 803. Cover; 804. Handle; 805. Fan blade; 806. Rigid hoop; 100. Conveyor belt. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] like Figure 1 As shown, a fine grinding device for soft magnetic cores mainly includes a mounting bracket 7 for providing support, a drive mechanism for providing rotational power, a conveyor belt 100 for transporting workpieces, and a core grinding mechanism 8. The mounting bracket 7 has a frame structure, with a bearing seat 6 fixedly installed inside or on the side. Inside the bearing seat 6, a vertically arranged rotating shaft 5 is rotatably connected via a high-precision angular contact ball bearing or tapered roller bearing. The rotating shaft 5 serves as the main shaft, with its top end extending out of the bearing seat 6 and coaxially fixedly connected to the grinding mechanism 8, for driving the grinding mechanism 8 to perform high-speed planar rotational motion.

[0028] The drive mechanism adopts a side-mounted belt drive layout, specifically including a drive motor 1, a driving pulley 2, a transmission belt 3, and a driven pulley 4. The drive motor 1 is fixed to one side of the mounting bracket 7 by bolts, with its output shaft vertically upward and equipped with the driving pulley 2. The driven pulley 4 is fixedly sleeved on the bottom end of the rotating shaft 5 by a key connection. The transmission belt 3 is tensioned and sleeved between the driving pulley 2 and the driven pulley 4. After the drive motor 1 starts, it flexibly drives the rotating shaft 5 to rotate through the belt drive. This transmission method can effectively filter the high-frequency vibration generated by the motor and prevent the vibration from being directly transmitted to the grinding mechanism 8, thereby ensuring the flatness of the ground surface.

[0029] like Figures 3 to 6 As shown, the grinding mechanism 8 adopts a modular assembly structure. The grinding mechanism 8 includes a central column 801, multiple grinding blocks 802, and a cover 803. The central column 801 is a disc-shaped or short column-shaped base, and its bottom center is rigidly connected to the top of the rotating shaft 5 by a flange or screws. Multiple insertion ports 8011 are provided along the axial direction of the central column 801, and these insertion ports 8011 are evenly distributed in a ring array on the disc surface of the central column 801.

[0030] In this embodiment, the grinding block 802 is the main body of the grinding operation, and its material is usually a diamond composite sheet or a cubic boron nitride grinding wheel. The grinding block 802 has a fan-shaped structure with a wider outer arc end and a narrower inner end. A strip 8021 is fixedly installed vertically upward at the narrower end of each grinding block 802. The strip 8021 is a curved metal sheet with external threads machined on its outer wall surface.

[0031] During assembly, the operator inserts the inserts 8021 of each grinding block 802 into the corresponding slots 8011 of the central post 801 from bottom to top. Once all grinding blocks 802 are in place, they align circumferentially to form a hollow, disc-shaped grinding disc structure. Simultaneously, all the inserts 8021 extending through the slots 8011 converge at the center of the central post 801, forming a hollow cylindrical structure with continuous or discontinuous threads on its outer wall. The cover 803 is a cylindrical component with an open bottom and a closed top, its inner wall machined with internal threads matching the inserts 8021. The cover 803 is screwed onto the outside of the hollow cylindrical structure formed by the inserts 8021. As the cover 803 is tightened, it applies an axial lifting or pressing force to the insert 8021, thereby firmly locking all the grinding blocks 802 axially onto the central post 801, preventing the grinding blocks 802 from falling off under gravity or shifting under the grinding reaction force. To facilitate manual tightening, two rod-shaped handles 804 are symmetrically welded to the outer wall of the cover 803.

[0032] To further enhance structural safety under high-speed rotation, the grinding mechanism 8 is also equipped with a rigid hoop 806. The rigid hoop 806 consists of two semi-circular C-shaped steel bars. When all the grinding blocks 802 are assembled into a disc shape, the two C-shaped structures close together from the outside, tightly fitting the wider outer arc surface of all the grinding blocks 802. Connecting ears are provided at the contact ends of the two C-shaped structures, which are locked together by a bolt and nut assembly. The rigid hoop 806 provides a strong radial-centripetal force to each grinding block 802, effectively resisting the centrifugal force generated by high-speed rotation and preventing the grinding blocks 802 from being thrown radially outward.

[0033] To address the issue of high heat generation during grinding of soft magnetic cores, this embodiment integrates an air-cooling structure into the grinding mechanism 8. Multiple fan blades 805 are welded or integrally formed on the outer wall of the central column 801. The number of fan blades 805 matches the number of grinding blocks 802, and each fan blade 805 is positioned precisely above the gap between two adjacent grinding blocks 802. The fan blades 805 have a specific tilt angle, configured to function as an axial fan when the grinding mechanism 8 rotates at high speed with the shaft 5, generating a powerful upward suction airflow. This airflow rapidly draws away and discharges hot air, water vapor, and fine dust accumulated below the grinding mechanism 8 (i.e., the grinding contact area), thereby achieving active heat dissipation of the grinding area and preventing thermal damage to the magnetic core.

[0034] like Figure 1 As shown, a conveyor belt 100 is positioned directly below the grinding mechanism 8. To improve processing efficiency, the conveyor belt 100 employs a dual-station design, with two parallel conveyor belts 100 arranged on either side of the rotating shaft 5, fully utilizing the linear velocity regions on both sides of the disc in the grinding mechanism 8. A powerful electromagnet or permanent magnet array is laid beneath the conveyor belt 100 as a magnetic attraction component to attract soft magnetic cores placed on the belt. Simultaneously, several transverse limiting strips are vulcanized or bonded to the surface of the conveyor belt 100. The height of the limiting strips is designed to be lower than the thickness of the magnetic core to be ground, preventing the core from slipping in the belt's running direction while also avoiding interference with the grinding block 802's grinding of the core's top surface.

[0035] To achieve automated production, an automatic feeding system is also installed at the beginning of the conveyor belt 100. The automatic feeding system mainly consists of a vibratory feeder, a linear vibrating track, and a transfer robot. Scattered magnetic cores are first fed into the vibratory feeder and arranged in a uniform posture (e.g., the surface to be ground is facing upwards) through vibration screening. The arranged magnetic cores are then transported to the gripping position via the linear vibrating track. The transfer robot (such as a suction cup robot) grips the magnetic cores from the end of the linear vibrating track and precisely places them between two adjacent limit strips on the surface of the conveyor belt 100, where they are then attracted and fixed by the magnetic suction components below.

[0036] This embodiment also provides a method for fine grinding of soft magnetic cores using the above-described device, the specific workflow of which is as follows: First, the drive motor 1 is started, which drives the rotating shaft 5 and the grinding mechanism 8 on top to start rotating at high speed via belt drive. At this time, the fan blade 805 rotates and begins to establish an upward suction airflow field.

[0037] Next, the conveyor belt 100 and the automatic feeding system are started. The magnetic core is placed orderly on the conveyor belt 100 by the automatic feeding system and is firmly fixed by the combined action of the magnetic suction component and the limiting strip. The magnetic core moves at a constant speed with the conveyor belt 100, passing directly below the grinding mechanism 8. The rotating grinding block 802 cuts and grinds the top surface of the magnetic core, and the heat generated is promptly carried away by the airflow generated by the fan blades 805.

[0038] When the production process requires adjusting the grinding depth (e.g., to compensate for wear) or changing grinding blocks of different grit (e.g., switching from coarse grinding to fine grinding), perform the following adjustment steps: After stopping the machine, loosen the cover 803 to release the axial force locking of the grinding block 802 (the rigid clamp 806 can be loosened or kept in place as needed). Select at least two grinding blocks 802 that are centrally symmetrically distributed in the circumferential direction (e.g., 180 degrees apart) as the grinding group for this operation.

[0039] Simultaneously adjust the position of this set of symmetrical grinding blocks 802 downwards so that their bottom surface is lower than the other grinding blocks 802 that are not currently in use. For example, if only two fine grinding blocks are needed, lower these two fine grinding blocks while keeping the remaining coarse grinding blocks at a higher position.

[0040] After confirming that the adjustment is correct, tighten the cover 803 again with force, and lock the adjusted grinding block 802 in place again through the insert 8021.

[0041] It is important to note that, in order to ensure that the threads on the surface of the cylindrical structure formed by all the inserts 8021 remain continuous after adjusting the height of the grinding block 802, so that the cover 803 can be screwed in smoothly, the lifting and lowering adjustment distance of the grinding block 802 should be controlled to be an integer multiple of the pitch of the external thread of the inserts 8021. For example, if the thread pitch is 2mm, the operator should adjust the grinding block 802 in increments of 2mm, 4mm, or 6mm each time. This step-by-step adjustment method ensures that the thread profiles of each insert 8021 remain aligned on the spatial helix after misalignment, thereby ensuring the effective implementation of the locking function.

[0042] Because the adjustment is performed strictly according to the principle of central symmetry, the mass distribution of the grinding mechanism 8 remains symmetrical with respect to the axis of rotation 5 after adjustment. Therefore, during subsequent high-speed rotation operations, the center of gravity of the grinding mechanism 8 is always located on the axis of rotation, maintaining dynamic balance and preventing harmful vibrations that could cause machining marks.

[0043] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A fine grinding apparatus for a soft magnetic core, used for fine grinding a soft magnetic core on a conveyor belt (100), characterized in that, include: Rotating shaft (5); A drive mechanism is used to drive the rotating shaft (5) to rotate at high speed; as well as A grinding mechanism (8) is coaxially fixed at the top of the rotating shaft (5); The polishing mechanism (8) includes a central column (801), multiple polishing blocks (802), and a cover (803); The central column (801) is fixed on the rotating shaft (5), and the central column (801) is arranged in a ring array and has multiple insertion ports (8011) through it along the axial direction. Each of the grinding blocks (802) has a vertically arranged insert (8021) at its end, and each grinding block (802) is inserted into the socket (8011) from bottom to top through the insert (8021); Each of the inserts (8021) is arc-shaped and has threads on its outer side wall. When all the grinding blocks (802) are inserted into place, all the inserts (8021) together form a hollow cylindrical structure with threads on the outer side at the center of the central column (801). The cover (803) is cylindrical and has threads on its inner wall. The cover (803) is threaded to the outside of the hollow cylindrical structure and axially locks all the grinding blocks (802) onto the central column (801).

2. The fine grinding apparatus for a soft magnetic core according to claim 1, characterized in that, The grinding mechanism (8) also includes a rigid hoop (806), which includes two semi-circular C-shaped structures. The two C-shaped structures can be enclosed to form a closed loop and locked to the outer circumferential sidewalls of all the grinding blocks (802) by fasteners, providing radial converging and fixing force for each grinding block (802).

3. The fine grinding apparatus for a soft magnetic core according to claim 1, characterized in that, The polishing mechanism (8) also includes a plurality of fan blades (805), which are disposed on the outer side wall of the central column (801), and each fan blade (805) is located in the gap between two adjacent polishing blocks (802); the tilt angle of the fan blades (805) is configured such that when the polishing mechanism (8) rotates, the fan blades (805) generate a suction airflow from bottom to top, which draws the heat of the working area below the polishing mechanism (8) upward.

4. The fine grinding apparatus for a soft magnetic core according to claim 1, characterized in that, The polishing block (802) has a fan-shaped structure that is wide at one end and narrow at the other end, and the insert (8021) is vertically arranged at its narrower end; when each of the polishing blocks (802) is installed in place, the wider end of each polishing block (802) is arc-shaped and the axis coincides, and the whole assembly forms a hollow disc-shaped structure.

5. The fine grinding apparatus for a soft magnetic core according to claim 1, characterized in that, The conveyor belt (100) is located directly below the polishing mechanism (8), and the conveyor belt (100) is provided with a magnetic suction component for adsorbing the magnetic core; the conveyor belt (100) is configured as a dual-station structure, and the two conveyor belts (100) are respectively arranged parallel to each other on both sides of the rotating shaft (5); the surface of the conveyor belt (100) is provided with a limiting strip with a height lower than the thickness of the magnetic core, which is used to cooperate with the magnetic suction component to fix the magnetic core.

6. The fine grinding apparatus for a soft magnetic core according to claim 1, characterized in that, It also includes a mounting bracket (7) and a bearing seat (6) mounted on the mounting bracket (7), and the rotating shaft (5) is rotatably connected in the bearing seat (6); the drive mechanism includes a drive motor (1), a drive pulley (2), a transmission belt (3) and a driven pulley (4); the drive motor (1) is mounted on one side of the mounting bracket (7), the drive pulley (2) is connected to the output shaft of the drive motor (1), the driven pulley (4) is mounted on the bottom of the rotating shaft (5), and the transmission belt (3) is respectively sleeved on the drive pulley (2) and the driven pulley (4).

7. The fine grinding apparatus for a soft magnetic core according to claim 1, characterized in that, Two handles (804) for applying a turning torque are symmetrically arranged on the outer side wall of the cover (803).

8. The fine grinding apparatus for a soft magnetic core according to claim 1, characterized in that, It also includes an automatic feeding system, which is set at the beginning of the conveyor belt (100) for transporting the magnetic cores to be ground; the automatic feeding system includes a vibratory feeder, a linear vibrating track and a transfer robot, the vibratory feeder is used to arrange the magnetic cores in a uniform posture, and the transfer robot is used to grab the magnetic cores at the end of the linear vibrating track and place them between the limiting strips of the conveyor belt (100).

9. A method of using the fine grinding apparatus for a soft magnetic core according to any one of claims 1 to 8, comprising the following steps: S1: Start the drive mechanism to drive the grinding mechanism (8) to rotate at high speed; S2: The magnetic core to be ground is transported to the ground mechanism (8) for grinding; The method is characterized by further including a grinding block adjustment step: When it is necessary to adjust the grinding depth or replace the grinding blocks (802) with different grits, loosen the cover (803), select at least two grinding blocks (802) that are centrally symmetrically distributed as a working group, and simultaneously adjust the grinding blocks (802) in the working group downwards to the same working height, and ensure that the working height is lower than the height of the other grinding blocks (802). After adjustment, tighten the cover (803) so that the grinding mechanism (8) maintains a dynamic balance with its center of gravity on the axis of the rotating shaft (5) during operation.

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