Equipment for polishing magnetic core

Abstract

The invention discloses equipment for polishing a magnetic core, and belongs to the technical field of polishing devices.The equipment for polishing the magnetic core is characterized in that an outer polishing roller is installed on a fixed table, a workbench is further installed on a support, an inner polishing roller is installed on the workbench, and the outer polishing roller and the inner polishing roller are symmetrically arranged; drivers capable of driving the outer polishing roller and the inner polishing roller to rotate are further installed on the support on the lower portion of the fixed table and the lower portion of the working table respectively, a containing barrel for containing a magnetic core is further arranged on the working table, and the inner polishing roller is located in the containing barrel; an opening allowing the magnetic core to stretch out is further formed in the position, close to the outer polishing roller, of the storage barrel, and a limiting assembly capable of fixing the magnetic core is further arranged in the storage barrel. A linear guide rail is further installed on the rack on the lower portion of the working table, the working table is movably connected to the guide rail, and the storage barrel can be driven through external driving equipment so as to drive the magnetic core to be close to or away from the outer grinding roller. In this way, the outer wall and the inner wall of the magnetic core can be polished synchronously, and the polishing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding devices, and particularly to a device for grinding magnetic cores. Background Art

[0002] A magnetic core refers to a sintered magnetic metal oxide composed of various iron oxide mixtures. For example, manganese-zinc ferrite and nickel-zinc ferrite are typical magnetic core materials. Manganese-zinc ferrite has the characteristics of high magnetic permeability and high magnetic flux density, and has the characteristic of low loss at frequencies below 1 MHz; nickel-zinc ferrite has characteristics such as extremely high impedance rate and low magnetic permeability of less than a few hundred, and also generates low loss at frequencies above 1 MHz. Ferrite magnetic cores are used in coils and transformers of various electronic devices.

[0003] The magnetic core of a solenoid valve is an important component, which affects the use of the overall solenoid valve. The magnetic core needs to be ground during processing, but the existing grinding devices have low efficiency when grinding magnetic cores.

[0004] The existing magnetic cores are relatively rough on the surface after being sintered and formed in the workshop, and the surface of the sintered magnetic cores is uneven and cannot be used directly. It is necessary to perform surface grinding treatment on the surface of the magnetic cores through grinding design. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a device for grinding magnetic cores.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A device for grinding magnetic cores, including a frame. A fixed table is connected to the frame through a bracket. An external grinding roller is installed on the fixed table. An operating table is also installed on the bracket. An internal grinding roller is installed at the operating table. The external grinding roller and the internal grinding roller are symmetrically arranged. Drivers capable of driving the external grinding roller and the internal grinding roller to rotate are respectively installed at the brackets below the fixed table and the operating table. A placing cylinder for placing the magnetic core is also provided on the operating table. The internal grinding roller is located inside the placing cylinder;

[0007] An opening for the magnetic core to extend out is also opened at the placing cylinder near the external grinding roller. A limiting component capable of fixing the magnetic core is also provided inside the placing cylinder;

[0008] A linear guide rail is also installed on the frame below the operating table. The operating table is movably connected to the guide rail. A displacement component capable of driving the operating table to move away from or close to the fixed table by an external driving device can enable the outer wall of the magnetic core located inside the placing cylinder to contact or move away from the external grinding roller.

[0009] Preferably, a hole for installing the inner grinding roller is formed in the lower part of the storage cylinder, and the position of the hole is close to the opening of the storage cylinder. A support plate is further arranged inside the storage cylinder, and a rotatable bottom contact roller is installed on the support plate. The bottom contact roller is used to support the magnetic core. The number of the bottom contact rollers is multiple, and the bottom contact rollers are arranged at intervals.

[0010] Preferably, the limiting component includes a reinforcing support rod and a rotatable side contact roller. The reinforcing support rod is arranged inside the storage cylinder. The side contact roller is elastically connected to the side of the reinforcing support rod, and the outer surface of the side contact roller is in contact with the magnetic core. The number of the reinforcing support rods and the number of the side contact rollers are both multiple, and the reinforcing support rods and the side contact rollers are arranged at intervals.

[0011] Preferably, two groups of the limiting components are provided, and the two groups of limiting components are symmetrically arranged. The magnetic core is clamped between the side contact rollers of the two limiting components.

[0012] Preferably, a top limiting rod is further arranged inside the storage cylinder. The height dimension of the top limiting rod is greater than the height dimension of the magnetic core. A detachable limiting ring is connected to the upper part of the top limiting rod. The detachable limiting ring is fan-shaped, and rotatable top contact rollers are installed on the arc edge of the detachable limiting ring. The number of the top contact rollers is multiple, and the top contact rollers are arranged at intervals.

[0013] Preferably, a slider capable of matching with the linear guide rail is arranged at the lower part of the operating table. The driving device is connected to the frame, and the driving mode of the driving device for driving the operating table can be ball screw driving, linear motor driving, and hydraulic driving.

[0014] Preferably, the fixing table is circular, and a notch for the operating table to extend into is formed at the edge of the fixing table. The number of the operating tables is several, and the several operating tables are arranged at intervals along the circumference of the fixing table.

[0015] Preferably, a U-shaped rod is further connected to the reinforcing support rod. The two ends of the U-shaped rod are vertically connected to the reinforcing support rod. The multiple side contact rollers are connected to the middle of the U-shaped rod. Two symmetrical fixing pieces are arranged on the U-shaped rod, and the fixing pieces are located above the side contact rollers. Springs are arranged at the two ends of the U-shaped rod, and the two ends of the springs respectively abut against the fixing pieces and the reinforcing support rod.

[0016] Preferably, the multiple side contact rollers are further connected by an arc-shaped connecting rod.

[0017] The working principle of the present invention is as follows: A working table capable of small-scale displacement is arranged at the edge of a circular fixed table. The working table is connected to a linear guide on the frame and can be driven by a driving device on the linear guide to drive the entire working table, that is, the working table installed with the object placing cylinder can be displaced, so that the outer wall of the magnetic core in the object placing cylinder contacts or moves away from the outer grinding roller; the object placing cylinder can place the magnetic core, and an opening is also provided near the outer grinding roller of the fixed table. This opening can make a part of the magnetic core placed in the object placing cylinder extend out of the object placing cylinder, that is, for being ground by the outer grinding roller. An inner grinding roller is arranged inside the object placing cylinder.

[0018] The magnetic core is installed inside the object placing cylinder. Since the position of the hole groove is close to the opening of the object placing cylinder, the magnetic core is installed close to the opening of the object placing cylinder when installed. The magnetic core is in a circular ring shape and is sleeved on a set of limiting components and the top limiting rod, that is, a set of limiting components and the top limiting rod are located in the middle of the magnetic core. One side of the magnetic core extends out of the opening, and one side is fixed and limited by two sets of limiting components. The bottom of the magnetic core contacts the contact roller at the bottom of the object placing cylinder. The magnetic core is clamped between the side contact rollers of the two limiting components. A detachable limiting ring is also connected to the top of the magnetic core. The detachable limiting ring is connected to the top limiting rod and locked by a locking nut. After locking, the arc edge of the detachable limiting ring is located at the top of the magnetic core, that is, the top contact roller abuts against the top of the magnetic core. In this way, the magnetic core can be limited and fixed in the object placing cylinder, and a part of the outer wall of the magnetic core also extends out of the object placing cylinder.

[0019] After the magnetic core is fixed, the inner grinding roller is located inside the magnetic core, that is, the inner grinding roller contacts the inner wall of the magnetic core. Then, the entire working table installed with the magnetic core object placing cylinder is slowly moved towards the outer grinding roller of the fixed table by an external driving device, so that the outer surface of the magnetic core contacts the outer grinding roller, and the inner surface of the magnetic core abuts against the inner grinding roller. When approaching contact with the outer grinding roller, the outer grinding roller and the inner grinding roller are driven to rotate, and then the working table installed with the magnetic core object placing cylinder is slowly driven, so that the outer surface of the magnetic core contacts the outer grinding roller. Finally, the inner and outer walls of the magnetic core are ground by the two grinding rollers. A notch for the working table to extend into is opened on the circular fixed table, and multiple notches are annularly arranged on the fixed table. A linear guide and a working table connected to the linear guide are arranged at each notch. In this way, magnetic cores of the same batch size can be installed in the object placing cylinders on each working table, and then each external driving device is controlled by an external servo system to drive the working table to slowly move towards the outer grinding roller located in the middle, and then the grinding operation is carried out.

[0020] Compared with the prior art, the beneficial effects that the present invention can achieve are:

[0021] 1. The equipment for grinding magnetic cores is equipped with a working table and a fixing table. A large external grinding roller is set on the fixing table. Linear guides are installed on the frame under the fixing table, and the working table is slidably connected to the linear guides. A placing cylinder is connected to the working table. The magnetic core can be clamped in the placing cylinder, and each contact roller can contact the magnetic core, facilitating the positioning of the magnetic core and also facilitating its rotation.

[0022] 2. The equipment for grinding magnetic cores is also provided with movable working tables evenly distributed circumferentially at the edge of the fixing table. Then, each external driving device is controlled by an external servo system to drive the working table to slowly move synchronously towards the external grinding roller located in the middle. This enables multiple magnetic cores to move towards the external grinding roller synchronously. Through the external grinding roller and the internal grinding roller, the inner and outer surfaces of the magnetic core can be ground. In this way, the inner and outer surfaces of the magnetic core can be ground in one operation, and at the same time, multiple magnetic cores of the same size can be ground, further increasing the grinding efficiency. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a device for grinding magnetic cores in an embodiment;

[0024] Figure 2 It is a schematic structural diagram of the placing cylinder of a device for grinding magnetic cores in an embodiment;

[0025] Figure 3 It is a schematic structural diagram of the interior of the placing cylinder of a device for grinding magnetic cores in an embodiment;

[0026] Figure 4 It is a schematic structural diagram of the interior of the placing cylinder of a device for grinding magnetic cores in an embodiment;

[0027] Figure 5 It is a schematic structural diagram of the placing cylinder of a device for grinding magnetic cores in an embodiment without a magnetic core installed;

[0028] Figure 6 It is a schematic structural diagram of the limiting component in the placing cylinder of a device for grinding magnetic cores in an embodiment;

[0029] Figure 7 It is a schematic structural diagram of two groups of limiting components in the placing cylinder of a device for grinding magnetic cores in an embodiment

[0030] Wherein: 1. Frame; 2. Outer grinding roller; 3. Inner grinding roller; 4. Working table; 5. Fixed table; 6. Object placing cylinder; 7. Opening; 8. Support plate; 9. Bottom contact roller; 10. Linear guide rail; 11. Hole groove; 12. Reinforcing support rod; 13. Side contact roller; 14. Top limiting rod; 15. Detachable limiting ring; 16. Top contact roller; 17. U-shaped rod; 18. Spring; 19. Fixed piece; 20. Limiting piece; 21. Arc connecting rod. Detailed implementation manners

[0031] The following combines the Figures 1-7 description with specific embodiments to elaborate on the technical solution of the present invention.

[0032] Embodiment:

[0033] As shown in all views, a device for polishing a magnetic core provided by the present invention includes a frame 1. A fixed table 5 is connected to the frame 1 through a bracket. An external polishing roller 2 is installed on the fixed table 5. An operating table 4 is also installed on the bracket. An internal polishing roller 3 is installed at the operating table 4. The external polishing roller 2 and the internal polishing roller 3 are symmetrically arranged. Drivers capable of driving the external polishing roller 2 and the internal polishing roller 3 to rotate are respectively installed at the brackets below the fixed table 5 and the operating table 4. A placing cylinder 6 for placing the magnetic core is also arranged on the operating table 4. The internal polishing roller 3 is located inside the placing cylinder 6. An opening 7 for the magnetic core to extend out is opened at the placing cylinder 6 near the external polishing roller 2. A limiting component capable of fixing the magnetic core is also arranged inside the placing cylinder 6. A linear guide rail 10 is also installed on the frame 1 below the operating table 4. The operating table 4 is movably connected to the guide rail. A displacement component capable of driving the operating table 4 to move away from or close to the fixed table 5 by an external driving device can make the outer wall of the magnetic core located inside the placing cylinder 6 contact or move away from the external polishing roller 2. A hole slot 11 for installing the internal polishing roller 3 is opened at the lower part of the placing cylinder 6. The position of the hole slot 11 is close to the opening 7 of the placing cylinder 6. A support plate 8 is also arranged inside the placing cylinder 6. A rotatable bottom contact roller 9 is installed on the support plate 8. The bottom contact roller 9 is used to support the magnetic core. The number of the bottom contact rollers 9 is set to be multiple, and the bottom contact rollers 9 are arranged at intervals. The limiting component includes a strengthening support rod 12 and a rotatable side contact roller 13. The strengthening support rod 12 is arranged inside the placing cylinder 6. The side contact roller 13 is elastically connected to the side of the strengthening support rod 12, and the outer surface of the side contact roller 13 contacts the magnetic core. The number of the strengthening support rods 12 and the side contact rollers 13 are both set to be multiple, and the number of the strengthening support rods 12 and the side contact rollers 13 are both arranged at intervals. Two groups of limiting components are arranged, and the two groups of limiting components are symmetrically arranged. The magnetic core is clamped between the side contact rollers 13 of the two limiting components. A top limiting rod 14 is also arranged inside the placing cylinder 6. The height dimension of the top limiting rod 14 is greater than the height dimension of the magnetic core. A detachable limiting ring 15 is connected to the upper part of the top limiting rod 14. The detachable limiting ring 15 is in a fan shape. Rotatable top contact rollers 16 are installed on the arc edge of the detachable limiting ring 15. The number of the top contact rollers 16 is set to be multiple, and the top contact rollers 16 are arranged at intervals. A slider capable of matching with the linear guide rail 10 is arranged at the lower part of the operating table 4. The driving device is connected to the frame 1, and the driving device can drive the operating table 4 in ways such as ball screw drive, linear motor drive, and hydraulic drive. The fixed table 5 is circular, and a notch for the operating table 4 to extend into is opened at the edge of the fixed table 5. The number of the operating tables 4 is set to be several, and several operating tables 4 are arranged at intervals along the circumference of the fixed table 5., a U-shaped rod 17 is further connected to the reinforcing support rod 12. Both ends of the U-shaped rod 17 are vertically connected to the reinforcing support rod 12. A plurality of the side contact rollers 13 are connected to the middle of the U-shaped rod 17. Two symmetrical fixing pieces 19 are further arranged on the U-shaped rod 17. The fixing pieces 19 are located above the side contact rollers 13. Springs 18 are arranged at both ends of the U-shaped rod 17. Both ends of the springs 18 respectively abut against the fixing pieces 19 and the reinforcing support rod 12; the plurality of side contact rollers 13 are also connected to each other by an arc-shaped connecting rod 21.;

[0034] The fixing table 5 is circular. A plurality of notches spaced circumferentially are further formed in the fixing table 5. The notches are used for installing the working table 4. The lower parts of the fixing table 5 and the working table 4 are both connected by a frame 1. A linear guide rail 10 is further installed on the frame 1 located below the working table 4. The working table 4 is slidably connected to the direct guide rail and is driven by an external driving device, which can be a ball screw drive, a linear motor drive, and a hydraulic drive.

[0035] The reinforcing support rod 12 arranged inside the storage cylinder 6 is rectangular. Both ends of the U-shaped rod 17 are connected to the reinforcing support rod 12. Limiting pieces 20 are further connected to both ends of the U-shaped rod 17. The limiting pieces 20 abut against the surface of the reinforcing support rod 12. The springs 18 at both ends of the U-shaped rod 17 respectively abut against the other surface of the reinforcing support rod 12 and the fixing pieces 19. That is to say, the limiting pieces 20 and the fixing pieces 19 are connected to both ends of the U-shaped rod 17. The limiting pieces 20 and the fixing pieces 19 are arranged in parallel at both ends of the U-shaped rod 17. The springs 18 are located between the reinforcing support rod 12 and the fixing pieces 19. When a magnetic core needs to be installed, the U-shaped rod 17 is squeezed to make way for the magnetic core, so as to facilitate the magnetic core to be loaded into the placement cylinder. After the magnetic core is installed, that is, the bottom of the magnetic core abuts against the bottom contact roller 9, and then the U-shaped rod 17 is released, so that the side contact rollers 13 on the U-shaped rod 17 are in contact with the surface of the magnetic core, and thus the two groups of limiting components can clamp the magnetic core.

[0036] This can fix the magnetic core. Since the magnetic core is sleeved inside the storage cylinder 6, that is, a set of limiting components and the top limiting rod 14 are located in the middle of the magnetic core. Thus, setting a detachable limiting ring 15 at the top of the magnetic core can further fix the magnetic core. A thread is provided at the upper end of the top limiting rod 14, and a plurality of locking nuts are connected to the thread. First, screw the locking nuts onto the top limiting rod 14, adjust the locking nuts to a height flush with the top surface of the magnetic core, and then install the detachable limiting ring 15. A rotatable top contact roller 16 is also installed on the arc edge of the detachable limiting ring 15, and the top contact roller 16 abuts against the top of the magnetic core. Then, by screwing the locking nuts, the detachable limiting ring 15 is locked and fixed. In this way, the magnetic core can be limited by the detachable limiting ring 15 located in the upper part, the bottom contact roller 9 located in the lower part, and the side contact rollers 13 of the two sets of limiting components. And another part of the magnetic core is limited by the inner grinding roller 3 and the outer grinding roller 2. This can increase its connection stability and at the same time increase the stability and reliability of grinding. That is to say, the magnetic core is limited by a plurality of contact rollers in the storage cylinder 6, and the inner grinding roller 3 and the outer grinding roller 2 fix and grind the magnetic core.

[0037] The plurality of side contact rollers 13 are also connected by an arc-shaped connecting rod 21. That is to say, arc-shaped connecting rods 21 are connected to both ends of each adjacent side contact roller 13. This can make each side contact synchronous, ensure the stable rotation of the contact roller, and prevent deviation. The bottom contact roller 9 is rotatably connected to the support plate 8 of the storage cylinder 6. Since the magnetic core is a hollow ring, the bottom contact rollers 9 are arranged at equal intervals along the arc. In this way, the bottom contact rollers 9 can better contact the bottom of the magnetic core and rotate synchronously with the magnetic core. Similarly, the limiting components are also arranged at equal intervals along the arc of the outer edge of the magnetic core. Thus, the bottom contact rollers 9 and the side contact rollers 13 can better contact the magnetic core wall, and then when the magnetic core rotates, each contact roller can also rotate synchronously.

[0038] Working steps: first, each workbench 4 is driven by an external driving device, and each external driving device is controlled by an external servo system, and the storage tube 6 of the workbench 4 is moved away from the outer grinding roller 2 on the fixed table 5; then, the magnetic core is installed inside the storage tube 6 in turn, the side contact rollers 13 of the two limiting components are broken apart, and then the magnetic core is installed so that the bottom of the magnetic core is against the bottom contact roller 9 on the storage tube 6, and then the side contact rollers 13 of the two limiting components are loosened so that each side contact roller 13 is against the magnetic core, one group of limiting components is located on the outside of the magnetic core, and one limiting component is located on the magnetic core The inner side of the magnetic core, and the top limiting rod 14 is also located on the inner side of the magnetic core, the side contact roller 13 is against one side of the magnetic core, the inner grinding roller 3 is against the inner wall of the magnetic core, and a part of the magnetic core extends out of the opening 7 of the storage tube 6, that is, on both sides of the horizontal direction of the magnetic core, one side is the inner grinding roller 3, and the other side is two limiting components, which fix the magnetic core in the storage tube 6, and then further limit the magnetic core in the storage tube 6; install the top contact roller 16, first screw the locking nut on the top limiting rod 14, adjust the locking nut to a height flush with the top surface of the magnetic core, and then install it. A detachable limiting ring 15 is provided on the arc edge of the detachable limiting ring 15, and a rotatable top contact roller 16 is installed, and the top contact roller 16 is against the top of the magnetic core, and then the detachable limiting ring 15 is locked and fixed by screwing the locking nut; after the magnetic core is fixed and limited, each workbench 4 is controlled by the servo system, and synchronously driven, and the storage tube 6 on each workbench 4 moves slowly toward the outer grinding roller 2 located in the middle, so that multiple magnetic cores can move synchronously toward the outer grinding roller 2, slowly bring the outer wall of the magnetic core close to the outer grinding roller 2, and then start the drive The device drives the outer grinding roller 2 and the inner grinding roller 3 to rotate, and then drives the storage tube 6 equipped with the magnetic core, so that the outer wall of the magnetic core extending out of the opening 7 of the storage tube 6 abuts against the outer grinding roller 2, so that the inner and outer walls of the magnetic core can be polished, and the outer grinding roller 2 and the inner grinding roller 3 are slowly stopped after the grinding is completed, and after stopping, the workbench 4 is driven to reset, and after the reset is completed, the detachable limit ring 15 is removed, and then the magnetic core in each storage tube 6 is taken out, so that the magnetic core can be polished, and the magnetic cores of the same size can be polished at one time, thereby improving production efficiency and production accuracy.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus for grinding magnetic cores, comprising a frame, a fixed table connected to the frame through a bracket, characterized in that, An external grinding roller is installed on the fixed table, and a working table is also installed on the bracket. An internal grinding roller is installed at the working table. The external grinding roller and the internal grinding roller are symmetrically arranged. Drivers capable of driving the external grinding roller and the internal grinding roller to rotate are respectively installed at the brackets below the fixed table and the working table. A placing cylinder for placing the magnetic core is also arranged on the working table, and the internal grinding roller is located inside the placing cylinder; An opening for the magnetic core to extend out is also opened at the placing cylinder near the external grinding roller, and a limiting component capable of fixing the magnetic core is also arranged inside the placing cylinder; A linear guide rail is also installed on the frame below the working table. The working table is movably connected to the guide rail. A displacement component capable of driving the working table to move away from or close to the fixed table by an external driving device can make the outer wall of the magnetic core located inside the placing cylinder contact or move away from the external grinding roller.

2. The device for grinding magnetic cores according to claim 1, characterized in that: A hole groove for installing the internal grinding roller is opened at the lower part of the placing cylinder. The position of the hole groove is close to the opening of the placing cylinder. A support plate is also arranged inside the placing cylinder, and a rotatable bottom contact roller is installed on the support plate. The bottom contact roller is used to support the magnetic core. The number of the bottom contact rollers is set to be multiple, and the bottom contact rollers are arranged at intervals.

3. The device for grinding magnetic cores according to claim 2, characterized in that: The limiting component includes a reinforcing support rod and a rotatable side contact roller. The reinforcing support rod is arranged inside the placing cylinder. The side contact roller is elastically connected to the side of the reinforcing support rod, and the outer surface of the side contact roller contacts the magnetic core. The number of the reinforcing support rods and the number of the side contact rollers are both set to be multiple, and the reinforcing support rods and the side contact rollers are both arranged at intervals.

4. The device for grinding magnetic cores according to claim 3, characterized in that: Two groups of the limiting components are arranged, and the two groups of limiting components are symmetrically arranged. The magnetic core is clamped between the side contact rollers of the two limiting components.

5. The device for polishing a magnetic core according to claim 4, characterized in that: A top limiting rod is also arranged inside the placing cylinder. The height dimension of the top limiting rod is greater than the height dimension of the magnetic core. A detachable limiting ring is also connected to the upper part of the top limiting rod. The detachable limiting ring is fan-shaped. Rotatable top contact rollers are installed on the arc edge of the detachable limiting ring. The number of the top contact rollers is set to be multiple, and the top contact rollers are arranged at intervals.

6. The device for grinding magnetic cores according to claim 5, characterized in that: Sliders capable of matching with the linear guide rail are arranged at the lower part of the working table. The driving device is connected to the frame, and the driving modes of the driving device for driving the working table can be ball screw driving, linear motor driving and hydraulic driving.

7. The device for polishing a magnetic core according to claim 6, characterized in that: The fixed table is circular, and a notch for the working table to extend into is opened at the edge of the fixed table. The number of the working tables is set to be several, and the several working tables are arranged at intervals along the circumference of the fixed table.

8. A device for grinding magnetic cores according to claim 7, characterized in that: A U-shaped rod is also connected to the reinforcing support rod. The two ends of the U-shaped rod are vertically connected to the reinforcing support rod. Multiple side contact rollers are connected to the middle of the U-shaped rod. Two symmetric fixing pieces are also arranged on the U-shaped rod. The fixing pieces are located above the side contact rollers. Springs are also arranged at the two ends of the U-shaped rod. The two ends of the springs respectively abut against the fixing pieces and the reinforcing support rod.

9. The device for grinding a magnetic core according to claim 8, wherein: The multiple side contact rollers are also connected to each other by an arc-shaped connecting rod.

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