JP2011194528A - Brush polisher, and method of polishing brush for wound-rotor type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform, easily by one person, polishing of a brush used being pressed to the outer circumferential surface of a slip ring constituting a wound-rotor type motor, and obtain the same polished surfaces whoever performs it.SOLUTION: A brush polisher including an annular member 1, an arm 2, a brush holder 3, and an abrasive paper 4 is used. The abrasive paper 4 is fixed onto the outer circumferential surface of the annular member 1. The outer circumferential circle of the abrasive paper 4 is the same as the outer circumferential circle of the slip ring. A rotation shaft 21 of the arm 2 is fixed at the center of the annular member 1. The brush holder 3 is fixed onto the distal end 22 of the arm 2. An insertion angle of a new brush 5 is set by installing an old brush into the brush holder 3 of the brush polisher, fastening bolts 81, 82, and allowing the tips of the bolts to touch the old brush. Next, the new brush 5 is installed into the brush holder 3, and the arm 2 is rotated while the annular member 1 is fixed onto a workbench, thereby the distal end surface of the brush 5 is polished with use of the abrasive paper 4.

Description

  The present invention relates to a brush polisher and a method for polishing a brush for a wound motor using the brush polisher.

The winding motor is configured to supply a current to the three-phase winding of the rotor by bringing the brush into contact with the outer peripheral surface of the slip ring rotating around the rotor shaft while pressing the brush with a brush holder.
The brush of the winding motor preferably contacts the entire outer surface of the slip ring in order to allow a rated current to flow stably. Therefore, it is necessary to make the front end surface of the brush (surface to be brought into contact with the slip ring) into a curved shape along the outer peripheral surface of the slip ring. Therefore, when the worn old brush is replaced with a new one, the tip of the new brush is polished.

Conventionally, this grinding operation stops the winding motor, attaches a new brush to the brush holder with the old brush removed, puts a sandpaper between the new brush and the slip ring, and two workers However, it is done by reciprocating each holding the edge of sandpaper.
However, in the conventional method, since two workers perform the outer peripheral surface of the slip ring in two parts, not only is it time-consuming, but there is a large difference in the polished surface obtained by skilled and beginners. Arise. In addition, since the sandpaper is arranged outside the slip ring, the outer diameter of the sandpaper is larger than the outer diameter of the slip ring, so the shape of the outer peripheral surface of the slip ring and the shape of the tip surface of the brush after polishing There is a difference between

  In the following Patent Document 1, as a polishing machine for polishing a brush of a wound-type electric motor, a holding unit that holds the brush so that the axial direction of the brush is perpendicular to the outer peripheral surface of the slip ring, There is described a moving part that is provided in a holding part and that allows the holding part to move in the circumferential direction along the outer peripheral surface of the slip ring. According to this polishing machine, it is described that the tip surface (contact surface) of the brush can be easily polished into a shape that can be in close contact with the outer periphery of the slip ring. Further, it is described that the polishing operation is performed by pressing the tip end surface of the brush against sandpaper affixed to the outer peripheral surface of the slip ring using this polishing machine.

JP 2009-90428 A

  In the polishing method described in Patent Document 1, since the tip end surface of the brush is pressed against the sandpaper affixed to the outer peripheral surface of the slip ring, the shape of the outer peripheral surface of the slip ring and the tip end surface of the brush after polishing are determined. No countermeasure is taken against the difference between the shape and the shape. Moreover, since sandpaper is affixed to the outer peripheral surface of the actual slip ring to polish the brush, there is a risk of scratching the slip ring, and the wound motor cannot be operated while polishing.

  An object of the present invention is a method that does not use a slip ring of an actual machine as a method of polishing a brush that is used by being pressed against the outer peripheral surface of a slip ring that constitutes a wound-type electric motor, and is laborious compared to a conventional method. To provide a method that can reduce the difference between the shape of the outer peripheral surface of the slip ring and the shape of the tip surface of the brush after polishing without causing a large difference in the polished surface that can be obtained by anyone It is.

  In order to solve the above-mentioned problems, a brush polisher of the present invention is an instrument for polishing a brush used by pressing against an outer peripheral surface of a rotating annular body, and has an annular member having an outer peripheral surface corresponding to the outer peripheral surface. And an arm that is rotatably attached to the annular member with the central axis of the annular member as a center of rotation, and has a distal end extending outside the outer circumferential circle of the annular member, and fixed to the distal end of the arm. And a brush holder having a structure in which the held brush is pressed against the outer peripheral surface of the annular member with an elastic force, and a file surface provided on the outer peripheral surface of the annular member at a position facing the brush holder. To do.

  The brush polisher according to the present invention holds the brush by the brush holder, presses the brush against the outer peripheral surface of the annular member with an elastic force, and rotates the arm while the annular member is fixed. Is polished on the file surface. Therefore, the brush polisher of the present invention is configured such that the outer diameter of the file surface is the same as the outer diameter of the slip ring for the wound motor, and the brush holder is used by holding the brush for the wound motor. By doing so, the tip end surface of the wound motor brush can be easily polished into the same shape as the outer peripheral surface of the slip ring.

  That is, according to the method of polishing a brush for a wound motor using the brush polisher of the present invention, it takes less time than the conventional method, and there is a large difference in the polished surface obtained by anyone. The difference between the shape of the outer peripheral surface of the slip ring and the shape of the tip surface of the brush after polishing can be reduced. In addition, since the actual slip ring is not used for brush polishing, it is not necessary to stop the winding type motor to perform polishing. Therefore, by polishing a new brush in advance, after removing the old brush, the new brush after polishing can be immediately attached to operate the wound motor.

  In addition, since the brush holder that holds the brush for the winding motor has a structure that presses the brush against the outer peripheral surface of the slip ring with an elastic force, the tip end surface of the brush depends on the wrinkle for each winding motor, The brush is shaved while the axial direction of the brush is inclined with respect to the normal direction of the outer circumference of the slip ring. Therefore, when the worn old brush is replaced with a new one, it is necessary to polish the tip surface of the new brush so that it has the same shape as the old brush.

Since the brush polisher of this invention polishes a brush using the said annular member instead of a slip ring, the holding angle (the held brush of the brush with respect to the outer peripheral surface of the said annular member is used as the said brush holder. By using a device having an angle setting mechanism for setting the angle between the axial direction of the ring member and the normal direction of the outer peripheral circle of the annular member, it is possible to easily tilt the brush tip surface according to the wrinkle of each winding motor. Can be reproduced.
The said angle setting mechanism can be comprised with the screw member arrange | positioned with respect to the member which forms the space in which a brush is inserted in the insertion direction of a brush.

  By using the brush polisher of the present invention and polishing the brush used by being pressed against the outer peripheral surface of the slip ring constituting the wound-type electric motor, no one has to perform it compared to the conventional method. However, a large difference does not occur in the obtained polished surface, and the difference between the shape of the outer peripheral surface of the slip ring and the shape of the tip surface of the brush after polishing can be reduced.

It is a top view which shows the brush polisher equivalent to one Embodiment of this invention. It is the figure which looked at the brush grinder of FIG. 1 from the arrow A direction. It is the figure which expanded a part of brush polisher of FIG. 1, Comprising: The part by which the brush holder is being fixed to the front-end | tip part of an arm is shown. It is the figure which looked at FIG. 3 from the arrow B direction. It is a figure explaining the structure of the brush holder of the brush polisher of FIG. It is a figure explaining the procedure which attaches a brush to the brush holder of the brush polisher of FIG. 1, Comprising: The state which attached the old brush which was worn out and has set the holding angle of the brush with the angle setting mechanism is shown. It is a figure explaining the procedure which attaches a brush to the brush holder of the brush polisher of FIG. 1, Comprising: Even if the worn-out old brush is removed, it shows that the set holding angle of the brush is hold | maintained. It is a figure explaining the procedure which attaches a brush to the brush holder of the brush polisher of FIG. 1, Comprising: The new brush is shown in the state attached with the set holding angle.

Embodiments of the present invention will be described below.
FIG. 1 is a plan view showing the brush grinder of this embodiment. FIG. 2 is a view of the brush grinder shown in FIG. This brush grinder includes an annular member 1, an arm 2, a brush holder 3, and a sandpaper 4. FIG. 1 shows a state in which the brush 5 is held by the brush holder 3.

  The dimensions of the annular member 1 other than the material and outer diameter are the same as the slip ring that contacts the brush for the wound-type electric motor to be polished. A sandpaper 4 is fixed to the outer peripheral surface of the annular member 1. The sandpaper 4 has a width of about 2/3 of the annular member 1 in the axial direction, one end in the width direction is aligned with the upper end of the annular member 1, and both sides of the sandpaper 4 are on the outer circumferential surface of the annular member 1 with the filed surface 4a facing outward. It is pasted with tape. The outer diameter of the annular member 1 is smaller by the thickness of the sandpaper 4 and the double-sided tape that fixes the same. Thereby, the outer peripheral surface of the sandpaper 4 fixed to the annular member 1 has the same size as the outer peripheral surface of the slip ring.

Inside the annular member 1, the reinforcing members 11 and 12 are disposed so as to be orthogonal to each other at the center of the circle forming the annular member 1, and both ends of each reinforcing member 11 and 12 are fixed to the inner peripheral surface of the annular member 1. Has been. A rotating shaft 21 of the arm 2 is fixed at the center of the annular member 1 where the reinforcing members 11 and 12 intersect.
The upper end of the rotating shaft 21 is at the same position as the upper end surface of the annular member 1, and the base end of the arm 2 is fixed on the rotating shaft 21. The distal end portion 22 of the arm 2 extends to the outside from the outer circumferential circle of the annular member 1. The brush holder 3 is fixed to the tip portion 22. FIG. 3 is an enlarged view of this portion, and shows a state where the brush 5 is not held by the brush holder 3. A handle 23 is fixed to the upper surface of the arm 2 at a position slightly inside the inner peripheral surface of the annular member 1. 4 is a view of FIG. 3 viewed from the direction of arrow B. The brush holder 3 is fixed to the distal end portion 22 of the arm 2 by plate members 6 and 61 and fastening members 71 to 73.

  The brush holder 3 has substantially the same structure as the brush holder that holds the brush 5 for the wound motor, and has a space 31 into which the brush 5 is inserted. The space 31 is formed by four members 32 to 35. is doing. The members 32 and 33 are plate members arranged in parallel at a predetermined interval, and the member 34 is arranged between the plate members 32 and 33. One end of a coil spring 36 is fixed to the member 34. FIG. 5 is a view for explaining the structure of the brush holder 3 and shows a state in which a part of the plate 32 is broken from the brush holder 3.

  The member 35 is a plate member that closes the front end openings of both plate members 32 and 33, and is fixed to the end surfaces of both plate members 32 and 33. The member 34 side of both the plate materials 32 and 33 has a shape that rises upward, and a U-shaped upper member 37 is attached to the upper end portion thereof by a pivot 37a. A leaf spring 38 is fixed to the upper surface of the upper member 37. The brush 5 inserted into the space 31 is pressed against the outer peripheral surface of the annular member 1 by the elastic force of the leaf spring 38. The other end of the coil spring 36 passes through the upper end bent portion of the upper member 37 and is fixed to a knob 39 disposed outside the upper member 37.

  Female screws 35 a and 35 b are formed in the plate member 35 at an intermediate position in the vertical direction of the space 31 in which the brush is inserted and a position close to the annular member 1. The tips of the bolts 81 and 82 are screwed into the female screws 35a and 35b. Nuts 91 and 92 are screwed onto the shafts of the bolts 81 and 82. These female screws 35a and 35b, bolts 81 and 82, and nuts 91 and 92 constitute an angle setting mechanism for setting a holding angle of the brush inserted into the space 31 with respect to the outer peripheral surface of the annular member 1.

When polishing the brush of the winding type motor using this brush polisher, first, the brush 5A, which has been worn out after being removed from the winding type motor after the annular member 1 is fixed to the work table, is applied to the brush holder 3. Install. The front end surface of the brush 5A is a circumferential surface having an inclination corresponding to the flange of the wound-type electric motor that has been attached.
Specifically, from the state of FIG. 5, the upper member 37 of the brush holder 3 is rotated about the pivot 37 a and opened upward, the brush 5 A is inserted into the space 31 from the upper side, the upper member 37 is lowered, and the leaf spring 38 is put on the brush 5A. Thereby, the front end surface of the brush 5 </ b> A comes into contact with the surface of the sandpaper 4 of the annular member 1. The brush 5 </ b> A is held by the brush holder 3 in a state where the axial line J is inclined by an angle θ with respect to the normal H of the outer circumferential circle of the annular member 1.

Next, the bolts 81 and 82 are tightened and the tip is applied to the brush 5A. Next, the nuts 91 and 92 are turned and applied to the plate material 35. FIG. 6 shows this state. As a result, the inclination θ of the front end surface of the brush 5A according to the winding of the winding motor is specified by the positions of the nuts 91 and 92 with respect to the bolts 81 and 82, and the brush holder is defined as the brush holding angle with respect to the outer peripheral surface of the annular member 1 3 is set.
Next, the bolts 81 and 82 are loosened without moving the nuts 91 and 92, and the upper member 37 is lifted to remove the brush 5 </ b> A from the space 31. FIG. 7 shows this state. Thus, even if the worn-out old brush 5A is removed, the set holding angle of the brush is held at the positions of the nuts 91 and 92 with respect to the bolts 81 and 82.

  Next, the new brush 5 is inserted into the space 31 of the brush holder 3, the upper member 37 is lowered, and the leaf spring 38 is applied onto the brush 5. Next, the bolts 81 and 82 are tightened until the nuts 91 and 92 contact the plate material 35. FIG. 8 shows this state. As a result, the new brush 5 is held by the brush holder 3 at the set holding angle θ. This holding angle θ is the same as the inclination of the tip surface of the old brush 5 </ b> A according to the wrinkle of each winding motor.

In this state, the tip 2 of the new brush 5 is polished with the sandpaper 4 on which the outer peripheral surface of the slip ring is reproduced by turning the arm 2 with the handle 23. This polishing is performed until the tip end surface of the new brush 5 comes into contact with the file surface 4a. Thereby, the front end surface of the new brush 5 is ground to the same surface as the front end surface of the old brush 5A. That is, the polished surface of the new brush 5 comes into close contact with the outer peripheral surface of the slip ring of the corresponding wound motor, and the slope θ corresponding to the wrinkles of each wound motor is reproduced.
Therefore, by polishing the brush for a wound motor using this brush polisher, the inclination of the tip end surface of the brush according to the wrinkle for each wound motor can be easily reproduced, and the shape of the outer peripheral surface of the slip ring The difference between the shape of the tip surface of the brush after polishing can be reduced.

  Further, in this method using the brush grinder, since the polishing is performed by rotating the arm 2 by one worker, the conventional polishing method in which two workers reciprocate each with an end of a sandpaper. Compared to the above, it is possible to prevent a great difference in the polished surface obtained by anyone who does not take time and effort. If the arm 2 is rotated by a machine, the labor cost can be further reduced.

  In addition, since the actual slip ring is not used for brush polishing, it is not necessary to stop the winding type motor to perform polishing. In addition, using an old brush that has been removed from the wound-type motor and stored in advance, the inclination of the brush tip according to the wrinkle of each wound-type motor is reproduced on the brush polisher, and a new brush is polished. I can leave. Therefore, when replacing the brush, after removing the old brush, it is possible to operate the wound-type electric motor by immediately attaching a new brush polished in advance.

DESCRIPTION OF SYMBOLS 1 Ring member 11, 12 Reinforcement material 2 Arm 21 Rotating shaft 22 Arm tip 23 Arm 3 Handle 3 Brush holder 31 Space where brush is inserted 32-35 Member 35a, 35b forming space where brush is inserted Angle setting mechanism)
37 upper member 37a pivot 38 leaf spring 39 knob 4 sandpaper 4a file 5 brush 81, 82 bolt (angle setting mechanism)
91, 92 Nut (angle setting mechanism)

Claims (4)

A tool for polishing a brush used by pressing against the outer peripheral surface of a rotating annular body,
An annular member having an outer peripheral surface corresponding to the outer peripheral surface;
With respect to this annular member, an arm that is rotatably attached with the central axis of the annular member as a rotation center, and whose tip extends to the outside of the outer circumferential circle of the annular member;
A brush holder fixed to the tip of the arm and configured to press the held brush against the outer peripheral surface of the annular member with an elastic force;
A file surface provided at a position facing the brush holder on the outer peripheral surface of the annular member;
A brush grinder characterized by comprising:   The brush polisher according to claim 1, wherein the brush holder has an angle setting mechanism for setting a holding angle of the brush with respect to the outer peripheral surface of the annular member.   The brush angler according to claim 2, wherein the angle setting mechanism is configured by a plurality of screw members arranged in a brush insertion direction with respect to a member forming a space in which the brush is inserted.   The brush grinder according to any one of claims 1 to 3, wherein the brush surface is configured so that an outer diameter of the file surface is the same as an outer diameter of a slip ring for a wound motor, A method for polishing a brush for a wound-type electric motor, comprising: polishing a brush used by being pressed against an outer peripheral surface of a slip ring constituting an electric motor.

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