1. The utility model provides a EP type ferrite core center pillar grinder, includes the base station, its characterized in that: the device comprises a base station, a grinding mechanism, a fixing seat, a scale, a digital display vernier and a locking member, wherein the base station is provided with a support, the support is provided with an installation frame capable of moving up and down along the support, the installation frame is fixedly provided with the grinding mechanism, the base station is fixedly provided with the fixing seat for fixing an EP type ferrite magnetic core below the grinding mechanism, one side of the support is fixedly connected with the scale which is vertically arranged on the base station, the scale is provided with the digital display vernier, and the digital display vernier can move up and down along the scale on one hand and can be fixed on the scale through the locking member on the other hand; the mounting frame and the digital display vernier are fixedly connected with a cross arm and a limiting piece on opposite sides respectively in a corresponding mode, a travel switch is installed at the front end of the cross arm, a contact of the travel switch can be in contact with the limiting piece when moving downwards along with the mounting frame, and at the moment, the mounting frame stops moving downwards.

2. The EP type ferrite core center pillar grinding apparatus according to claim 1, wherein: the support including fixed connection be in the stand of base station rear side, the top fixedly connected with of stand extends the mount pad forward, mount pad and base station between rotate and install the double-screw bolt, install the first motor that can carry out just reversing on the mount pad, the output shaft downwardly extending of first motor and with the upper end looks fixed connection of double-screw bolt.

3. The EP type ferrite core center pillar grinding apparatus according to claim 2, wherein: the travel switch is electrically connected with the first motor, and the controller is electrically connected with the travel switch and the first motor respectively.

4. An EP type ferrite core center pillar grinding apparatus according to claim 3, characterized in that: when the contact of the travel switch is in contact with the limiting sheet, the contact sends a position signal to the controller, the controller controls the first motor to stop, and at the moment, the mounting frame stops moving downwards.

5. The EP type ferrite core center pillar grinding apparatus according to claim 1, wherein: the mounting frame comprises a movable seat and a clamping piece, the movable seat is mounted on the support and can move up and down along the support, and the clamping piece is mounted at the front end of the movable seat and clamps the grinding mechanism on the movable seat.

6. An EP type ferrite core center pillar grinding apparatus according to claim 2 or 5, characterized in that: the moving seat is arranged on the upright post through sliding fit on one hand, and is arranged on the stud through threaded fit on the other hand; the clamping piece comprises two semicircular hoops, one ends of the two semicircular hoops are rotatably connected to the front end of the movable seat, the other ends of the two semicircular hoops are fixedly connected with extension seats, and the two extension seats are provided with first screw holes communicated with each other.

7. The EP type ferrite core center pillar grinding apparatus according to claim 6, wherein: the grinding mechanism comprises a second motor, an output shaft of the second motor extends downwards and is fixedly connected with a cylindrical grinding wheel, and the bottom surface of the cylindrical grinding wheel is a grinding surface; the second motor is sleeved between the two semicircular hoops, a first locking bolt is screwed into the two first screw holes and screwed tightly, and the second motor is clamped between the two semicircular hoops.

8. The EP type ferrite core center pillar grinding apparatus according to claim 1, wherein: the fixing seat adopts a sucker type electromagnet, and the sucker type electromagnet generates magnetic force when being electrified to fix the EP type ferrite magnetic core on the sucker type electromagnet.

9. The EP type ferrite core center pillar grinding apparatus according to claim 1, wherein: the initial position of the digital display vernier is positioned at the lower end of the scale, and a second screw hole is formed in one side of the digital display vernier; the locking piece comprises a second locking bolt, the second locking bolt is screwed into the second screw hole, and the digital display vernier can be fixed on the scale when the second locking bolt is screwed tightly; when the digital display vernier is unscrewed, the digital display vernier can move up and down along the scale.

10. A method for controlling the feed of a grinding wheel based on the grinding apparatus according to any one of claims 1 to 5 and 7 to 9, characterized in that: the method specifically comprises the following steps:

s1, firstly clamping the grinding mechanism on the clamping piece, then fixing an EP type ferrite magnetic core on the sucker type electromagnet, and keeping the central axis of a central column of the EP type ferrite magnetic core and the central axis of the cylindrical grinding wheel on the same straight line;

s2, starting the first motor to work, moving the grinding mechanism downwards until the bottom surface of the cylindrical grinding wheel abuts against the upper end surface of the middle column of the EP type ferrite magnetic core, and stopping;

s3, moving the digital display vernier upwards until the limit piece is contacted with the contact of the travel switch, and then, zeroing the digital display vernier;

s4, moving the digital display vernier downwards until the numerical value displayed by the digital display vernier reaches a target size, namely, a set size of the EP type ferrite magnetic core, which needs to be ground, is reached, and then fixing the digital display vernier on the scale;

s5, respectively starting the first motor and the second motor to work, further moving the grinding mechanism downwards, and rotating the cylindrical grinding wheel to grind the center column of the EP type ferrite magnetic core in the process; when a contact of the travel switch is contacted with the limiting sheet, the travel switch sends a position signal to the controller, the controller controls the first motor to stop, the grinding mechanism stops moving downwards at the moment, the ground size of the middle column of the EP type ferrite magnetic core reaches the set size required to be ground, and grinding is finished;

and S6, finally, taking down the ground EP type ferrite magnetic core from the sucker type electromagnet.

Background

The high-frequency electronic transformer is an electronic transformer with high working frequency, generally the working frequency is higher than 20kHz, and the high-frequency electronic transformer mainly comprises a ferrite core, a coil, a framework, a wiring terminal (PIN needle) and the like, wherein the ferrite core adopts two EP type ferrite cores which are mutually butted besides the two EP type ferrite cores which are mutually butted. High frequency electronic transformers using EP type ferrite cores generally have excellent electromagnetic shielding effects.

In general, an air gap of about 1-2 mm is formed between the center pillars of the two EP type ferrite cores, which has the function of reducing the magnetic permeability, so that the characteristics of the wire Wei are less dependent on the initial magnetic permeability of the core material, the magnetic saturation phenomenon under the condition of large alternating current signal or direct current bias can be avoided, and the inductance can be better controlled.

At present, a grinder is generally used to grind the center pillar of the ferrite core. The existing grinding machine generally comprises a base, wherein a motor with two output shafts is usually fixed on the base, grinding wheels are respectively installed on the two output shafts, in addition, Jiong-shaped brackets are respectively fixed on the left side and the right side of the base, strip-shaped through holes are arranged at the top of the Jiong-shaped bracket, and the two strip-shaped through holes are respectively correspondingly used for the wheel edges of the two grinding wheels to enter.

Because the front side and the rear side of the center pillar of the E-type ferrite core are both of an open structure, the E-type ferrite core can be ground by adopting an abrasive machine, the operation is simple, convenient and fast, namely, the E-type ferrite core is held by an operator, the left side pillar, the right side pillar and the center pillar of the E-type ferrite core are all downward, the left side pillar and the right side pillar are attached to the top surface of an Jiong-shaped support of the abrasive machine, the center pillar of the EP-type ferrite core is pushed to be in contact with the abrasive wheel along the top surface of the Jiong-shaped support, namely, along the tangential direction of the abrasive wheel, and the center pillar is ground by the abrasive wheel.

The front and rear sides of the center pillar of the EP ferrite core are semi-open and semi-closed structures, and if the center pillar of the EP ferrite core is ground by using a grinder and the above grinding method, the closed portion on the front side or the rear side of the center pillar is easily damaged.

For this purpose, a bench drill is generally used to grind the center pillar of the EP ferrite core, i.e., the EP ferrite core is fixed on the base of the bench drill, a grinding mechanism (including a motor and a cylindrical grinding wheel fixed on the end of the output shaft of the motor) is fixed on the support of the bench drill, and the handle thereon is rotated to move the support downwards, so as to drive the grinding mechanism to move downwards, and contact with the center pillar of the EP ferrite core, and the center pillar is ground by the rotating cylindrical grinding wheel.

In the process of grinding operation, because the EP-type ferrite core is generally small and no measurement is taken during grinding, how to ensure grinding accuracy by grinding the center pillar of the EP-type ferrite core to a set size that needs to be ground is a problem that is difficult to solve.

Disclosure of Invention

The invention aims to overcome the defects and shortcomings in the prior art, and provides an EP-type ferrite magnetic core center column grinding device and a grinding wheel feed control method, which can realize automatic upward movement and downward movement of a grinding mechanism, and can control the grinding mechanism to stop downward movement through a travel switch and a limiting sheet which are matched in the process of downward movement for grinding a magnetic core; in addition, by setting and controlling the downward movement stroke (feed size) of the cylindrical grinding wheel, the grinding process does not need to be interrupted for repeated measurement, and the required magnetic core can be obtained by only carrying out grinding once, so that the working efficiency is improved, and the grinding precision is ensured.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a EP type ferrite core center pillar grinder, includes the base station, its characterized in that: the device comprises a base station, a grinding mechanism, a fixing seat, a scale, a digital display vernier and a locking member, wherein the base station is provided with a support, the support is provided with an installation frame capable of moving up and down along the support, the installation frame is fixedly provided with the grinding mechanism, the base station is fixedly provided with the fixing seat for fixing an EP type ferrite magnetic core below the grinding mechanism, one side of the support is fixedly connected with the scale which is vertically arranged on the base station, the scale is provided with the digital display vernier, and the digital display vernier can move up and down along the scale on one hand and can be fixed on the scale through the locking member on the other hand; the mounting frame and the digital display vernier are fixedly connected with a cross arm and a limiting piece on opposite sides respectively in a corresponding mode, a travel switch is installed at the front end of the cross arm, a contact of the travel switch can be in contact with the limiting piece when moving downwards along with the mounting frame, and at the moment, the mounting frame stops moving downwards.

Further, the support including fixed connection be in the stand of base station rear side, the top fixedly connected with of stand extends the mount pad forward, mount pad and base station between rotate and install the double-screw bolt, install the first motor that can carry out just reversing on the mount pad, the output shaft downwardly extending of first motor and with the upper end looks fixed connection of double-screw bolt.

Furthermore, the invention also comprises a controller which is respectively electrically connected with the travel switch and the first motor.

Further, when the contact of the travel switch is in contact with the limiting sheet, the contact sends a position signal to the controller, the controller controls the first motor to stop, and at the moment, the mounting frame stops moving downwards.

Furthermore, the mounting frame comprises a movable seat and a clamping piece, the movable seat is mounted on the support and can move up and down along the support, and the clamping piece is mounted at the front end of the movable seat and clamps the grinding mechanism on the movable seat.

Further, the movable seat is mounted on the upright post through sliding fit on one hand, and is mounted on the stud through threaded fit on the other hand; the clamping piece comprises two semicircular hoops, one ends of the two semicircular hoops are rotatably connected to the front end of the movable seat, the other ends of the two semicircular hoops are fixedly connected with extension seats, and the two extension seats are provided with first screw holes communicated with each other.

Further, the grinding mechanism comprises a second motor, an output shaft of the second motor extends downwards and is fixedly connected with a cylindrical grinding wheel, and the bottom surface of the cylindrical grinding wheel is a grinding surface; the second motor is sleeved between the two semicircular hoops, a first locking bolt is screwed into the two first screw holes and screwed tightly, and the second motor is clamped between the two semicircular hoops.

Furthermore, the fixed seat adopts a sucker type electromagnet, and the sucker type electromagnet generates magnetic force when being electrified to fix the EP type ferrite magnetic core on the sucker type electromagnet.

Furthermore, the initial position of the digital display vernier is positioned at the lower end of the scale, and a second screw hole is formed in one side of the digital display vernier; the locking piece comprises a second locking bolt, the second locking bolt is screwed into the second screw hole, and the digital display vernier can be fixed on the scale when the second locking bolt is screwed tightly; when the digital display vernier is unscrewed, the digital display vernier can move up and down along the scale.

A grinding wheel feed control method is characterized in that: the method specifically comprises the following steps:

s1, firstly clamping the grinding mechanism on the clamping piece, then fixing an EP type ferrite magnetic core on the sucker type electromagnet, and keeping the central axis of a central column of the EP type ferrite magnetic core and the central axis of the cylindrical grinding wheel on the same straight line;

s2, starting the first motor to work, moving the grinding mechanism downwards until the bottom surface of the cylindrical grinding wheel abuts against the upper end surface of the middle column of the EP type ferrite magnetic core, and stopping;

s3, moving the digital display vernier upwards until the limit piece is contacted with the contact of the travel switch, and then, zeroing the digital display vernier;

s4, moving the digital display vernier downwards until the numerical value displayed by the digital display vernier reaches a target size, namely, a set size of the EP type ferrite magnetic core, which needs to be ground, is reached, and then fixing the digital display vernier on the scale;

s5, respectively starting the first motor and the second motor to work, further moving the grinding mechanism downwards, and rotating the cylindrical grinding wheel to grind the center column of the EP type ferrite magnetic core in the process; when a contact of the travel switch is contacted with the limiting sheet, the travel switch sends a position signal to the controller, the controller controls the first motor to stop, the grinding mechanism stops moving downwards at the moment, the ground size of the middle column of the EP type ferrite magnetic core reaches the set size required to be ground, and grinding is finished;

and S6, finally, taking down the ground EP type ferrite magnetic core from the sucker type electromagnet.

Compared with the prior art, the invention has the beneficial effects that:

1. the grinding mechanism (comprising a second motor and a cylindrical grinding wheel) is fixedly arranged on an installation frame capable of moving up and down along a support, a vertical scale is arranged on one side of the support, and a digital display vernier capable of moving up and down along the scale is arranged on the scale; in addition, the mounting frame and the digital display vernier are respectively and correspondingly connected with a cross arm and a limiting piece, a travel switch is arranged at the front end of the cross arm, a contact of the travel switch can be contacted with the limiting piece when moving downwards along with the mounting frame, and the mounting frame stops moving downwards; therefore, the grinding mechanism can automatically move up and down, and can be controlled to stop moving down through the travel switch and the limiting piece which are matched with each other in the process of grinding the magnetic core by moving down.

2. The invention provides a grinding wheel feed control method based on a grinding device, in the process of grinding operation, after the magnetic core is fixed, the grinding mechanism is moved downwards firstly until the bottom surface of the cylindrical grinding wheel is abutted against the upper end surface of the middle column of the magnetic core and then is stopped, then the digital display vernier is moved upwards until the limit piece touches the contact of the travel switch, then the digital display vernier is zeroed, then the digital display vernier is moved downwards until the numerical value displayed by the digital display vernier reaches the set size of the magnetic core which needs to be ground, then the grinding mechanism is moved downwards further, in the process, the cylindrical grinding wheel rotates, grinding the center pillar of the magnetic core, and stopping moving down the grinding mechanism when a contact of the travel switch is contacted with the limiting sheet, wherein the ground size of the center pillar of the magnetic core can reach the set size required to be ground; therefore, by setting and controlling the downward movement stroke (feed size) of the cylindrical grinding wheel, the grinding process is not required to be interrupted for repeated measurement, the required magnetic core can be obtained by only carrying out grinding once, the working efficiency is effectively improved, and the grinding precision is ensured.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Fig. 3 is an enlarged schematic view of the structure of part B in fig. 1.

Fig. 4 is a block diagram of the electrical control principle of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the invention provides an EP-type ferrite core center pillar grinding device, which comprises a base table 1, wherein a support 2 is installed on the base table 1, an installation frame 3 capable of moving up and down along the support 2 is installed on the support 2, a grinding mechanism 4 is fixedly installed on the installation frame 3, a fixing seat 5 for fixing an EP-type ferrite core 14 is fixedly installed below the grinding mechanism 4 on the base table 1, a vertically arranged scale 6 is fixedly connected to one side of the support 2 on the base table 1, a digital display vernier 7 is installed on the scale 6, the digital display vernier 7 can move up and down along the scale 6 on one hand, and can be fixed on the scale 6 through a locking piece 8 on the other hand; the mounting frame 3 and the digital display vernier 7 are respectively and fixedly connected with a cross arm 9 and a limiting piece 10 at opposite sides correspondingly, a travel switch 11 is installed at the front end of the cross arm 9, a contact of the travel switch 11 can be contacted with the limiting piece 10 when moving downwards along with the mounting frame 3, and at the moment, the mounting frame 3 stops moving downwards.

In the invention, the bracket 2 comprises an upright post 21 fixedly connected to the rear side of the base station 1, the top end of the upright post 21 is fixedly connected with a mounting seat 22 extending forwards, a stud 23 is rotatably arranged between the mounting seat 22 and the base station 1, a first motor 12 capable of rotating forwards and backwards is arranged on the mounting seat 22, and an output shaft of the first motor 12 extends downwards and is fixedly connected with the upper end of the stud 23.

The grinding device also comprises a controller 13, and the controller 13 is electrically connected with the travel switch 11 and the first motor 12 respectively.

Therefore, when the contact of the travel switch 11 touches the limiting sheet 10, the in-place signal is sent to the controller 13, the controller 13 controls the first motor 12 to stop, and at the moment, the mounting frame 3 stops moving downwards.

In the present invention, the mounting frame 3 includes a movable base 31 and a clamping member, the movable base 31 is mounted on the frame 2 and can move up and down along the frame 2, and the clamping member is mounted on the front end of the movable base 31 and clamps the grinding mechanism 4 thereon.

In the invention, the movable seat 31 is arranged on the upright post 21 through sliding fit on one hand, and on the stud 23 through threaded fit on the other hand; the clamping piece comprises two semicircular hoops 32, one ends of the two semicircular hoops 32 are rotatably connected to the front end of the movable seat 31, the other ends of the two semicircular hoops 32 are fixedly connected with extension seats 33, and the two extension seats 33 are provided with first screw holes which are communicated with each other.

In the invention, the grinding mechanism 4 comprises a second motor 41, an output shaft of the second motor 41 extends downwards and is fixedly connected with a cylindrical grinding wheel 42, and the bottom surface of the cylindrical grinding wheel 42 is a grinding surface; the second motor 41 is sleeved between the two semicircular hoops 32, and the first locking bolt 34 is screwed into the two first screw holes and screwed tightly, so that the second motor 41 is clamped between the two semicircular hoops 32.

In the invention, the fixed seat 5 adopts a sucker type electromagnet which generates magnetic force when being electrified so as to realize the fixation of the EP type ferrite magnetic core 14 on the sucker type electromagnet.

In the invention, the initial position of the digital display vernier 7 is positioned at the lower end of the scale 6, and one side of the digital display vernier 7 is provided with a second screw hole; the locking piece 8 comprises a second locking bolt 81, the second locking bolt 81 is screwed into the second screw hole, and the digital display vernier 7 can be fixed on the scale 6 when the second locking bolt 81 is screwed; and when the digital display vernier 7 is unscrewed, the digital display vernier can move up and down along the scale 6.

In addition, the invention also provides a grinding wheel feed control method, which specifically comprises the following steps:

the grinding mechanism 4 is firstly clamped on the clamping piece, and then the EP type ferrite magnetic core 14 is fixed on the sucker type electromagnet, so that the central axis of the central column of the EP type ferrite magnetic core 14 and the central axis of the cylindrical grinding wheel 42 are kept on the same straight line.

Specifically, the two semicircular anchor ears 32 are unfolded from the front end, the second motor 41 is sleeved between the two semicircular anchor ears 32 from top to bottom, then the two semicircular anchor ears 32 are folded, so that the two semicircular anchor ears 32 are tightly held around the second motor 41, the first locking bolt 34 is screwed into the two first screw holes and screwed, and the second motor 41 is clamped between the two semicircular anchor ears 32;

then, the EP-type ferrite core 14 is placed on the chuck type electromagnet, the position of the EP-type ferrite core 14 is adaptively adjusted so that the central axis of the center pillar of the EP-type ferrite core 14 and the central axis of the cylindrical grinding wheel 42 are kept on the same straight line, and then, power is supplied so that the chuck type electromagnet generates magnetic force to adsorb the EP-type ferrite core 14 thereon.

Then, the first motor 12 is started to operate, and the grinding mechanism 4 is moved down until the bottom surface of the cylindrical grinding wheel 42 comes into contact with the upper end surface of the center pillar of the EP-type ferrite core 14, and then stopped.

Specifically, the first motor 12 is started to work, so that the first motor 12 rotates forwards, the stud 23 is driven to rotate forwards, the movable seat 31 and the clamping part move downwards along the stud 23 and the upright post 21, the second motor 41 and the cylindrical grinding wheel 42 are driven to move downwards, and the operation is stopped until the bottom surface of the cylindrical grinding wheel 42 abuts against the upper end surface of the center pillar of the EP-type ferrite core 14.

Then, the digital display vernier 7 is moved upwards until the limiting piece 10 contacts with the contact of the travel switch 11, and then the digital display vernier 7 is zeroed.

Specifically, the second locking bolt 81 is loosened, the digital display vernier 7 is moved upwards along the scale 6 until the limiting piece 10 contacts with the contact of the travel switch 11, and then the digital display vernier 7 is zeroed, and at this time, the numerical value displayed by the digital display vernier 7 is zero.

Then, the digital display vernier 7 is moved downwards until the numerical value displayed by the digital display vernier 7 reaches the target size, namely, the numerical value reaches the set size (about 0.5-1 mm) of the EP type ferrite magnetic core 14, which needs to be ground away, and then the digital display vernier 7 is fixed on the scale 6.

Specifically, the digital display vernier 7 is moved downwards along the scale 6 until the numerical value displayed by the digital display vernier 7 reaches the target size, that is, the set size (about 0.5-1 mm) of the EP-type ferrite core 14, which needs to be ground, is reached, and then the digital display vernier 7 is fixed on the scale 6 by screwing the second locking bolt 81 again.

Then, respectively starting the first motor 12 and the second motor 41 to work, and further moving the grinding mechanism 4 downwards, wherein in the process, the cylindrical grinding wheel 42 rotates to grind the center column of the EP type ferrite magnetic core 14; when the contact of the travel switch 11 touches the limiting sheet 10, the travel switch 11 sends a signal in place to the controller 13, the controller 13 controls the first motor 12 to stop, the grinding mechanism 4 stops moving downwards at the moment, the ground size of the center column of the EP-type ferrite magnetic core 14 reaches the set size (about 0.5-1 mm) needing to be ground, and grinding is completed.

Specifically, the first motor 12 and the second motor 41 are respectively started to work, so that the first motor 12 rotates forwards to drive the stud 23 to rotate forwards, the movable base 31 and the clamping piece further move downwards along the stud 23 and the upright post 21, and the second motor 41 and the cylindrical grinding wheel 42 are driven to further move downwards; during this process, the cylindrical grinding wheel 42 rotates to grind the center pillar of the EP ferrite core 14; when the contact of the travel switch 11 touches the limiting sheet 10, the travel switch 11 sends a signal in place to the controller 13, the controller 13 controls the first motor 12 to stop, at the moment, the second motor 41 and the cylindrical grinding wheel 42 stop moving downwards, meanwhile, the second motor 41 stops, the cylindrical grinding wheel 42 stops rotating, the ground size of the center column of the EP type ferrite magnetic core 14 reaches the set size (about 0.5-1 mm) needing to be ground, and grinding is completed.

Finally, the ground EP-type ferrite core 14 is removed from the suction cup type electromagnet.

Specifically, the first motor 12 is restarted to work, so that the first motor 12 rotates reversely, the stud 23 is driven to rotate reversely, the movable seat 31 and the clamping part move upwards along the stud 23 and the upright post 21, the second motor 41 and the cylindrical grinding wheel 42 are driven to move upwards, the stud and the clamping part are pulled away from the EP type ferrite core 14 by a certain distance (safety distance), then the power supply of the sucker type electromagnet is disconnected, the magnetic force generated by the sucker type electromagnet disappears, the adsorption on the ground EP type ferrite core 14 is released, and the ground EP type ferrite core 14 is taken down.

By adopting the method, the downward movement stroke (feed size) of the cylindrical grinding wheel 42 is set and controlled, repeated measurement is not required to be carried out by interrupting the grinding process, and only one-time grinding is needed to grind the end surface of the center pillar of a single EP type ferrite magnetic core 14 by about 0.5-1 mm, so that the working efficiency is effectively improved, and the grinding precision is ensured. Thereafter, the two EP type ferrite cores 14 are opposed to each other, thereby forming a gap of about 1 to 2mm, that is, an air gap, between the center pillars of the two cores.

In the actual grinding process, the first motor 12 is controlled to perform forward rotation and reverse rotation repeatedly for about 5 to 6 times, so that the cylindrical grinding wheel 42 moves up and down for about 5 to 6 times, and the center pillar of the EP-type ferrite core 14 is ground intermittently in one grinding operation. This prevents the center post of the EP ferrite core 14 from being excessively heated by the continuous grinding with the cylindrical grinding wheel 42, and from being broken or damaged.

It should be noted that the above-mentioned "forward rotation" and "reverse rotation" of the first motor 12 and the stud 23 are relative, and do not have absolute meaning, and the purpose is to distinguish the different directions of rotation, and thus to realize the upward and downward movement of the mounting frame 3 and the grinding mechanism 4.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.