Polishing device for side wall of magnetic core of mutual inductor

Abstract

The utility model relates to the technical field of magnetic core processing, in particular to a mutual inductor magnetic core side wall polishing device which comprises a base and a stand column arranged on the base, a top plate is arranged at the top of the stand column, a supporting platform is arranged in the middle of the base, a vertically-downward electric push rod is arranged on the top plate, and a pressing plate is arranged at the end of the electric push rod. An annular guide rail is arranged on the portion, on the periphery of the supporting platform, of the base, an annular rotary table is arranged on the annular guide rail, a grinding motor is arranged on a radial telescopic mechanism on the annular rotary table, and a grinding wheel is arranged at the output end of the grinding motor. According to the mutual inductor magnetic core side wall polishing device, the annular guide rail and the annular rotary table are used for driving the polishing motor and the polishing wheel to rotate, so that the side wall of the magnetic core fixed between the supporting platform and the pressing plate is polished, the pressure on the magnetic core can be effectively reduced, the magnetic core is prevented from being damaged, and stable and reliable polishing operation is ensured.

Description

Technical Field

[0001] This utility model relates to the field of magnetic core processing technology, and in particular to a device for grinding the sidewall of a current transformer magnetic core. Background Technology

[0002] Magnetic cores are obtained through die casting, high-temperature sintering, and post-processing. The shapes of magnetic cores vary, but most are toroidal structures. During the die casting process, burrs or uneven areas may appear on the sidewalls of the toroidal core, requiring grinding to ensure its subsequent performance. However, existing grinding devices typically involve rotating the core, and maintaining stability during rotation requires applying significant clamping force, which can damage the core and affect its quality. Utility Model Content

[0003] To address the aforementioned technical deficiencies, this invention provides a device for grinding the sidewall of a current transformer core, which can fix the core before grinding to prevent damage to the core.

[0004] This utility model discloses a device for grinding the sidewall of a current transformer core, including a base and a column mounted on the base. A top plate is provided on the top of the column, and a support platform is provided in the middle of the base. A positioning protrusion is provided on the support platform for positioning the core to be ground. A vertically downward electric push rod is provided on the top plate, and a pressure plate is provided at the end of the electric push rod. The pressure plate is used to press the core to be ground onto the support platform. A circular guide rail is provided on the base surrounding the support platform. The central axis of the circular guide rail coincides with the central axis of the positioning protrusion on the support platform. A circular turntable is provided on the circular guide rail, and a radial telescopic mechanism is provided on the circular turntable. A grinding motor is provided on the radial telescopic mechanism on the circular turntable. A grinding wheel is provided at the output end of the grinding motor, and the grinding wheel is in contact with the sidewall of the core to be ground. A rack is provided on the outer wall of the circular turntable, and a drive motor is provided on the base. A drive gear is provided at the output end of the drive motor, and the drive gear meshes with the rack.

[0005] The support platform is circular, the pressure plate is circular, the outer diameter of the support platform is smaller than the outer diameter of the magnetic core to be polished, and the outer diameter of the pressure plate is smaller than the outer diameter of the magnetic core to be polished.

[0006] The diameter of the support platform is greater than or equal to the diameter of the pressure plate.

[0007] An end plate is fixed at the lower end of the electric push rod. A vertically downward positioning rod is set at the center of the end plate. A positioning sleeve is fitted on the positioning rod. The pressure plate has a ring structure and is fitted on the positioning sleeve. A compression spring is set between the end plate and the pressure plate. The two ends of the compression spring are fixed to the pressure plate and the end plate. The outer diameter of the positioning sleeve is consistent with the inner diameter of the magnetic core to be polished, and the positioning sleeve is located directly above the positioning protrusion.

[0008] A support plate is fitted onto a positioning sleeve above the pressure plate. At least three pressure sensors are evenly arranged in a ring between the support plate and the pressure plate. The lower end of the compression spring abuts against and is fixed to the support plate.

[0009] The inner diameter of the positioning sleeve is larger than the outer diameter of the positioning rod. A first annular protrusion extending radially inward is provided at the upper end of the positioning sleeve. The inner diameter of the first annular protrusion is equal to the outer diameter of the positioning rod. A second annular protrusion extending radially outward is provided at the end of the positioning rod inside the positioning sleeve. The outer diameter of the second annular protrusion is equal to the inner diameter of the positioning sleeve.

[0010] The present invention provides a grinding device for the side wall of a current transformer core. It uses a circular guide rail and a circular turntable to drive the grinding motor and grinding wheel to rotate, thereby grinding the side wall of the core fixed between the support platform and the pressure plate. This can effectively reduce the pressure on the core, avoid damage to the core, and ensure stable and reliable grinding operation. Attached Figure Description

[0011] Figure 1 This is a front view of the structure of this utility model;

[0012] Figure 2 This is a top view of the structure of this utility model;

[0013] Figure 3 for Figure 2 Schematic diagram of AA section;

[0014] Figure 4 This is a three-dimensional structural view of the present invention. Detailed Implementation

[0015] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0016] Example 1:

[0017] like Figures 1-4As shown, this utility model discloses a device for grinding the sidewall of a current transformer core, including a base 1 and a column 2 mounted on the base 1. A top plate 3 is provided on the top of the column 2, and a support platform 4 is provided in the middle of the base 1. A positioning protrusion 24 is provided on the support platform 4 for positioning the core 5 to be ground. A vertically downward electric push rod 6 is provided on the top plate 3, and a pressure plate 7 is provided at the end of the electric push rod 6 for pressing the core 5 to be ground onto the support platform 4. A circular guide rail 14 is provided on the base 1 surrounding the support platform 4. The central axis of the spindle coincides with the central axis of the positioning protrusion 24 of the support platform 4. An annular turntable 15 is provided on the annular guide rail 14. A radial telescopic mechanism 17 is provided on the annular turntable 15. A grinding motor 18 is provided on the radial telescopic mechanism 17 on the annular turntable 15. A grinding wheel 19 is provided at the output end of the grinding motor 18. The grinding wheel 19 is in contact with the side wall of the magnetic core 5 to be ground. A rack 16 is provided on the outer side wall of the annular turntable 15. A drive motor 20 is provided on the base 1. A drive gear 21 is provided at the output end of the drive motor 20. The drive gear 21 meshes with the rack 16.

[0018] A support platform 4 is set in the middle of the base 1. The upper surface of the support platform 4 is a horizontal plane. There is a positioning protrusion 24 on the support platform 4. In order for the positioning protrusion 24 to be positioned so that the magnetic core 5 to be ground can be positioned, the positioning protrusion 24 must be a cylindrical protrusion with a diameter consistent with the inner diameter of the magnetic core 5, and its height must be less than the thickness of the magnetic core 5. Before processing, the electric push rod 6 is retracted, so that the pressure plate 7 is separated from the support platform 4. The magnetic core 5 can be placed on the support platform 4 and fitted onto the positioning protrusion 24. Then the electric push rod 6 is extended, pressing the pressure plate 7 onto the magnetic core 5 to achieve clamping of the magnetic core 5.

[0019] A circular guide rail 14 is installed on the base 1. Since the central axis of the circular guide rail 14 coincides with the central axis of the positioning protrusion 24 of the support platform 4, the grinding motor 18 on the annular turntable 15 on the circular guide rail 14 maintains a consistent distance from the positioning protrusion 24 as the annular turntable 15 rotates. This ensures stable grinding of the sidewall of the magnetic core 5 and relatively high grinding precision. The grinding motor 18 drives the grinding wheel 19 to rotate, thus grinding the magnetic core 5. The drive gear 21 on the drive motor 20 cooperates with the rack 16 on the annular turntable 15 to drive the annular turntable 15 to operate stably. Of course, in order to adjust the amount of grinding on the magnetic core 5, a telescopic mechanism 17 is provided on the annular turntable 15. The telescopic mechanism 17 is arranged radially, so that the position of the grinding motor 18 can be adjusted according to actual needs to change the amount of grinding. Of course, the telescopic mechanism 17 is a known existing structure, and its structure is not limited. Specifically, a combination of a lead screw and nut with a slide rail can be used to adjust the position of the grinding motor 18. A slide rail is radially arranged along the annular turntable 15, and a slider is mounted on it. The grinding motor 18 is mounted on the slider, and a nut is mounted on the slider. A lead screw is rotatably mounted on the annular turntable 15, with its axis aligned with the length direction of the slide rail. Rotating the lead screw adjusts the position of the slider on the slide rail, thereby adjusting the radial position of the grinding motor 18 to regulate the grinding amount. The telescopic mechanism 17, consisting of the lead screw and nut, slide rail, and slider, is a commonly used and known mechanism on existing machine tools.

[0020] In the above scheme, the side wall of the magnetic core 5 is polished by fixing the magnetic core 5 and driving the polishing wheel 19 to rotate with the polishing motor 18. At the same time, the drive motor 20 drives the polishing motor 18 to perform circumferential motion, so that the polishing wheel 19 can polish the side wall of the magnetic core 5 360°. The polishing precision is high. In addition, the positioning protrusion 24 is used to position the magnetic core 5 during the polishing process. Therefore, the pressure required for the support platform 4 and the pressure plate 7 is small, the stability is high, and the magnetic core 5 will not be damaged.

[0021] The support platform 4 and the pressure plate 7 are both circular. The outer diameter of the support platform 4 is smaller than the outer diameter of the magnetic core 5 to be ground, and the outer diameter of the pressure plate 7 is also smaller than the outer diameter of the magnetic core 5 to be ground. Since the outer diameters of both the support platform 4 and the pressure plate 7 are smaller than the outer diameter of the magnetic core 5, the sidewalls of the magnetic core 5 are completely exposed, facilitating contact between the grinding wheel 19 and the sidewalls of the magnetic core 5. The grinding wheel 19 will not interfere with the support platform 4 or the pressure plate 7, making the grinding process safer. However, the outer diameters of the support platform 4 and the pressure plate 7 should not be too small, otherwise the support and clamping capacity will be weakened. The outer diameters of the support platform 4 and the pressure plate 7 only need to be slightly smaller than the outer diameter of the ground magnetic core 5.

[0022] The diameter of the support platform 4 is greater than or equal to the diameter of the pressure plate 7, which increases the support capacity for the magnetic core 5 and avoids damage to the magnetic core 5.

[0023] An end plate 8 is fixed to the lower end of the electric push rod 6. A vertically downward positioning rod 9 is set at the center of the end plate 8, and a positioning sleeve 10 is sleeved on the positioning rod 9. The pressure plate 7 has a ring structure and is sleeved on the positioning sleeve 10. A compression spring 11 is set between the end plate 8 and the pressure plate 7. The two ends of the compression spring 11 are fixed to the pressure plate 7 and the end plate 8. The outer diameter of the positioning sleeve 10 is consistent with the inner diameter of the magnetic core 5 to be polished, and the positioning sleeve 10 is located directly above the positioning protrusion 24. The sliding connection between the positioning sleeve 10 and the positioning rod 9 is used to achieve telescopic movement. During the downward pressing of the electric push rod 6, the compression spring 11 applies pressure to the pressure plate 7 to ensure that there is no impact during the pressing process. The clamping force on the magnetic core 5 gradually increases to ensure that the magnetic core 5 is not damaged.

[0024] A support plate 12 is fitted onto a positioning sleeve 10 above the pressure plate 7. Four pressure sensors 13 are evenly arranged in a ring between the support plate 12 and the pressure plate 7. The lower end of the compression spring 11 abuts against and is fixed to the support plate 12. The support plate 12 is mounted on the pressure plate 7, and four pressure sensors 13 are positioned between them. The pressure from the compression spring 11 is transmitted to the pressure plate 7 through the support plate 12 and the pressure sensors 13. Therefore, the pressure sensors 13 can sense the pressure applied to the magnetic core 5, effectively controlling the pressure and preventing excessive pressure from damaging the magnetic core 5.

[0025] The inner diameter of the positioning sleeve 10 is larger than the outer diameter of the positioning rod 9. A first annular protrusion 22 extending radially inward is provided at the upper end of the positioning sleeve 10. The inner diameter of the first annular protrusion 22 is equal to the outer diameter of the positioning rod 9. A second annular protrusion 23 extending radially outward is provided at the end of the positioning rod 9 inside the positioning sleeve 10. The outer diameter of the second annular protrusion 23 is equal to the inner diameter of the positioning sleeve 10.

[0026] In order to allow the positioning sleeve 10 and the positioning rod 9 to slide freely without separating, the first annular protrusion 22 and the second annular protrusion 23 are used to restrict the connection between the two and improve the stability of the equipment operation.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simplification, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A device for grinding the sidewall of a current transformer core, characterized in that: The device includes a base and a column mounted on the base. A top plate is located on the top of the column. A support platform is located in the middle of the base, and a positioning protrusion is provided on the support platform for positioning the magnetic core to be ground. A vertically downward electric push rod is located on the top plate, and a pressure plate is provided at the end of the electric push rod. The pressure plate is used to press the magnetic core to be ground onto the support platform. A circular guide rail is provided on the base surrounding the support platform. The central axis of the circular guide rail coincides with the central axis of the positioning protrusion on the support platform. A circular turntable is provided on the circular guide rail, and a radial telescopic mechanism is provided on the circular turntable. A grinding motor is provided on the radial telescopic mechanism on the circular turntable. A grinding wheel is provided at the output end of the grinding motor, and the grinding wheel is in contact with the side wall of the magnetic core to be ground. A rack is provided on the outer wall of the circular turntable, and a drive motor is provided on the base. A drive gear is provided at the output end of the drive motor, and the drive gear meshes with the rack.

2. The device for grinding the sidewall of a current transformer core according to claim 1, characterized in that: The support platform is circular, the pressure plate is circular, the outer diameter of the support platform is smaller than the outer diameter of the magnetic core to be polished, and the outer diameter of the pressure plate is smaller than the outer diameter of the magnetic core to be polished.

3. The device for grinding the sidewall of a current transformer core according to claim 2, characterized in that: The diameter of the support platform is greater than or equal to the diameter of the pressure plate.

4. The device for grinding the sidewall of a current transformer core according to claim 1, characterized in that: An end plate is fixed at the lower end of the electric push rod. A vertically downward positioning rod is set at the center of the end plate. A positioning sleeve is fitted on the positioning rod. The pressure plate has a ring structure and is fitted on the positioning sleeve. A compression spring is set between the end plate and the pressure plate. The two ends of the compression spring are fixed to the pressure plate and the end plate. The outer diameter of the positioning sleeve is consistent with the inner diameter of the magnetic core to be polished, and the positioning sleeve is located directly above the positioning protrusion.

5. A device for grinding the sidewall of a current transformer core according to claim 4, characterized in that: in A support plate is fitted onto the positioning sleeve above the pressure plate. At least three pressure sensors are evenly arranged in a ring between the support plate and the pressure plate. The lower end of the compression spring abuts against and is fixed to the support plate.

6. The device for grinding the sidewall of a current transformer core according to claim 5, characterized in that: The inner diameter of the positioning sleeve is larger than the outer diameter of the positioning rod. A first annular protrusion extending radially inward is provided at the upper end of the positioning sleeve. The inner diameter of the first annular protrusion is equal to the outer diameter of the positioning rod. A second annular protrusion extending radially outward is provided at the end of the positioning rod inside the positioning sleeve. The outer diameter of the second annular protrusion is equal to the inner diameter of the positioning sleeve.

Images