JP5677279B2 - Brake drum polishing equipment - Google Patents

Description

  The present invention relates to a brake drum polishing apparatus for polishing a braking surface of a brake drum of a brake device used in a rotating device.

Conventionally, as an example of performing polishing work at a place where equipment is installed, there is an apparatus for polishing a rail of a railway.
This polishing apparatus has two polishing units, and is configured so that the distance between the two units can be varied to follow the curvature of the rail. Two polishing units to which a polishing plate is attached are connected by a frame and pressed against a rail. The frame is configured to expand and contract so that the interval between the two units can be adjusted, and polishing is performed while adjusting the interval between the units according to the curvature of the rail (see, for example, Patent Document 1).
In addition, it is not a method to polish at the place where the equipment is installed, but as a means to polish the drum surface, a plurality of grinding stones supported by independent holders are radially pressed against the inner surface of the brake drum and pressed (See, for example, Patent Document 2).

JP 58-131202 A JP-A 61-14846

In the conventional polishing apparatus, since the grindstone is always in contact with the braking surface at the time of polishing, there is a problem that the temperature of the brake drum rises and parts of the rotating equipment may be damaged by heat.
In addition, when polishing using a plurality of grindstones, the temperature rise at the contact surface increases according to the number of grindstones, and even if the polishing time is shortened, the equipment may still be damaged by heat. There was a problem.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a brake drum polishing apparatus that suppresses damage to equipment due to heat.

A brake drum polishing apparatus according to the present invention is a brake drum polishing apparatus for polishing a braking surface of a brake drum of a brake device,
A fixed base having a yoke, an electromagnetic coil that is an electromagnet formed by winding a conductive wire around the yoke, a mover provided to be movable facing the fixed base, and the mover and the fixed base A compression spring that is provided between and for biasing the mover toward the braking surface of the brake drum;
A base fixed to the mover, and a grindstone provided on the base and in surface contact with the braking surface;
The grindstone is separated from the braking surface against the elastic force of the compression spring by electromagnetic force generated by energization of the electromagnetic coil,
The current of the electromagnetic coil is interrupted and the grindstone is pressed against the braking surface by the elastic force of the compression spring,
By repeating energization and interruption of the electromagnetic coil, the grindstone is intermittently pressed against the rotated braking surface to polish the braking surface.

  According to the brake drum polishing apparatus of the present invention, by repeatedly energizing and shutting off the electromagnetic coil, the grindstone is intermittently pressed against the rotated braking surface to polish the braking surface. As a result, it is possible to suppress the temperature of the brake drum from rising, and to reduce damage to the components of the rotating device due to heat.

It is a schematic diagram which shows the state with which the grinding | polishing apparatus of the brake drum of Embodiment 1 of this invention was attached to the winding machine. 2A is a schematic view showing the polishing apparatus of FIG. 1, and FIG. 2B is a schematic view of the main part of the polishing apparatus as viewed from the arrow A in FIG. 2A. FIG. 3A is a schematic view showing the main part of a brake drum polishing apparatus according to Embodiment 2 of the present invention, and FIG. 3B is an enlarged view of the main part of FIG. FIG. 4A is a schematic view showing a modification of the brake drum polishing apparatus of FIG. 3, and FIG. 4B is an enlarged view of the main part of FIG. FIG. 5A is a schematic view showing another modification of the brake drum polishing apparatus of FIG. 3, and FIG. 5B is a plan view of the main part of the polishing apparatus of FIG. 5A. 6A is a front view showing a mover of a brake drum polishing apparatus according to Embodiment 3 of the present invention, and FIG. 6B is a side view of FIG. 6A. 7 (a) and 7 (b) are diagrams showing a change in position between the fixed base and the mover shown in FIG. It is a schematic diagram which shows the modification of the grinding | polishing apparatus of the brake drum of Embodiment 3 of this invention. FIG. 9A is a front view schematically showing a main part of a brake drum polishing apparatus according to Embodiment 4 of the present invention, and FIG. 9B is a side view of FIG. 9A. FIG. 10A is a modification of the brake drum polishing apparatus according to Embodiment 4 of the present invention, and is a front view schematically showing the main part, and FIG. 10B is a side view of FIG. 10A. FIG.

Embodiment 1 FIG.
FIG. 1 is a schematic view showing a state in which a brake drum polishing device 8 (hereinafter abbreviated as a polishing device) according to an embodiment of the present invention is attached to a rotating device. As an example of a rotating device, an elevator hoist 1 is shown.
In the hoisting machine 1, a brake drum 2 of a brake device is fixed to a sheave around which a rope is wound.
The brake device includes the brake drum 2 and a brake body 4 that is provided around the brake drum 2 and brakes the rotation of the brake drum 2.
A pair of brake bodies 4 are attached to the upper part of the hoisting machine 1.
The brake body 4 includes a field 7 fixed to the hoist 1, an armature 6 provided in the field 7 and movable in the radial direction, a shoe 5 connected to the armature 6, and an adhesive to the shoe 5. Lined lining 3.
This brake device energizes an electromagnetic coil built in the field 7 and drives the armature 6 in the radial direction to separate the lining 3 from the braking surface of the brake drum 2 so that the brake drum 2 is free to rotate. Further, the electromagnetic coil is turned off and the lining 3 is pressed against the braking surface of the brake drum 2 for braking.

2A is a schematic view showing a pair of polishing apparatuses 8 fixed to the lower part of the hoisting machine 1, and FIG. 2B is a view when the fixing base 12 of FIG. is there.
The polishing apparatus 8 includes a fixed base 12 having a yoke 15 formed at an intermediate portion, an electromagnetic coil 17 formed by winding a copper wire as a conductive wire around the yoke 15, and an electromagnetic coil 17 as an electromagnet. Guide pins 13 loosely inserted into guide holes 14 formed on both sides of the brake drum 2 in the circumferential direction of the brake drum 2 and guides provided so as to face the fixed base 12 and with the tip portions of the guide pins 13 loosely inserted. And a mover 11 having a hole 30.
The polishing apparatus 8 includes a compression spring 16 that is loosely inserted into a pair of spring holes 31 formed in the fixed base 12, a base 10 that is fixed to the iron mover 11 with screws 32, and the base A grindstone 9 bonded to the base 10 with an adhesive is provided.
The contact surface 34 of the grindstone 9 has an arc shape so as to come into surface contact with the braking surface of the brake drum 2. The electromagnetic coil 17 has a copper wire wound around a bobbin in advance, and is fixed to the yoke 15 together with the bobbin around which the copper wire is wound.

When the polishing apparatus 8 of FIG. 1 is not in use, the hook 11 as a holding means is used to deflect the movable element 11 toward the fixed base 12, and the grindstone 9 is separated from the braking surface of the brake drum 2. State is maintained. When the polishing apparatus 8 is used, it is only necessary to remove the restriction of the movement of the mover 11 in the radially inner direction except for the hook 35.
Of course, the holding means for shifting and holding the movable element 11 toward the fixed base 12 is not limited to the hook 35. For example, a screw hole is provided in the fixed base 12, and a hole through which the screw passes through the movable element 11 is provided. Processing may be performed to fix the fixed base 12 and the movable element 11 with screws.

In this polishing apparatus 8, when the energization of the electromagnetic coil 17 is interrupted, the compression spring 16 always presses the movable element 11 to the brake drum 2 side by its elastic force, and the grindstone 9 causes the braking surface of the brake drum 2 to move. It is in pressure contact.
Further, when the electromagnetic coil 17 is energized, the electromagnetic coil 17 attracts the movable element 11 toward the fixed base 12 against the elastic force of the compression spring 16, and the grindstone 9 integrated with the movable element 11 is moved from the brake drum 2. It is separated.
Therefore, by repeatedly energizing and shutting off the electromagnetic coil 17 while the brake drum 2 is rotated, the grindstone 9 can intermittently contact the brake drum 2 and polish the brake drum 2 intermittently. It becomes.
The mover 11 repeats reciprocation by repeatedly energizing and interrupting the electromagnetic coil 17, and this reciprocation is guided by a pair of guide pins 13.

When polishing with the grindstone 9 at all times, the temperature of the sheave fixed to the brake drum 2 rises, the oil applied to the rope deteriorates, and the temperature of the hoist 1 itself also rises. There is an inconvenience that parts used in the hoist 1 are deteriorated.
However, according to the polishing apparatus 8 of this embodiment, the brake drum 2 can be polished intermittently using the grindstone 9 by repeatedly energizing and shutting off the electromagnetic coil 17, so that the brake drum 2 by polishing is used. The temperature rise of the hoisting machine 1 can be easily suppressed, the occurrence of the inconvenience can be reduced, and the reliability of the hoisting machine 1 is improved.

In addition, the brake drum 2 of the brake device may become dirty on the braking surface, such as corrosion due to salt or rust, due to long-term use of the equipment. They spent time cleaning work, such as wiping the braking surface.
On the other hand, troublesome manual work is not necessary for such cleaning work by using the polishing apparatus 8 of the present invention, and the cleaning work can be performed in a short time.

Further, since the compression springs 16 are provided on both sides in the circumferential direction of the brake drum 2 with the yoke 15 as a boundary, the bias of the circumferential pressure contact force with respect to the braking surface of the brake drum 2 of the grindstone 9 is suppressed. .
Further, since the guide pins 13 are provided on both sides in the circumferential direction of the brake drum with the yoke 15 as a boundary, the movable element 11 is not biased to one side in the circumferential direction with respect to the braking surface of the brake drum 2. Smooth guidance toward the braking surface.

Embodiment 2. FIG.
FIG. 3 (a) is a schematic diagram showing the main part of the polishing apparatus 8 according to Embodiment 2 of the present invention, and FIG. 3 (b) is an enlarged view of the main part of the polishing apparatus of FIG. 3 (a).
In this embodiment, the diameter of the guide hole 14A formed in the fixed base 12 is larger than that of the guide hole 14 of the first embodiment. A ring hole 33 is formed on the guide hole 14A side of the guide pin 13A. An O-ring 18 is fitted in the ring hole 33.
Other configurations are the same as those of the polishing apparatus 8 of the first embodiment.

In the polishing apparatus 8 of the first embodiment, the grindstone 9 is driven only in the radial direction of the brake drum 2 and the braking surface of the brake drum 2 is uniformly pressed and polished.
However, for example, when rust is generated on the braking surface and the surface roughness is large, when the grindstone 9 is uniformly pressed against the braking surface of the brake drum 2, the grindstone 9 locally contacts the brake drum 2. As a result, the polishing may not proceed uniformly.

However, in the polishing apparatus 8 of the second embodiment, there is a play dimension between the guide pin 13A and the guide hole 14A, the mover 11 fluctuates around the O-ring 18, and the grindstone 9 is used for the brake drum 2. Therefore, since the brake surface of the brake drum 2 is not uniformly pressed against the brake surface, it is possible to suppress contact with the brake surface.
Thus, the surface roughness of the brake drum 2 can be reduced uniformly by changing the posture of the grindstone 9.

FIG. 4A is a schematic view showing a modification of the polishing apparatus 8 according to Embodiment 2 of the present invention, and FIG. 4B is an enlarged view of a main part of the polishing apparatus 8 in FIG. 4A.
In this modified example, the compression spring 16 has one end portion accommodated in the spring hole 31 via the cylindrical first spacer 19 and the other end portion attached to the movable element 11. Housed in the spacer 20. The thickness of the second spacer 20 is thinner than that of the first spacer 19.
Further, there is no guide pin 13A and a guide hole 14A for guiding the guide pin 13A.
Other configurations are the same as those of the polishing apparatus of the first embodiment.

In this example, since the thickness of the second spacer 20 is smaller than that of the first spacer 19, there is a gap between the second spacer 20 and the spring hole 31, and the compression spring 16 is As shown in FIG. 4 (a), the first spacer 19 and the second spacer 20 are bent.
Therefore, the grindstone 9 integrated with the mover 11 fluctuates with respect to the braking surface of the brake drum 2, and the same effect as that of the polishing apparatus 8 shown in FIG. 3 can be obtained.
The second spacer 20 is also interlocked with the movement of the mover 11, but the end portion always faces the spring hole 31, so the second spacer 20 is the guide pin 13 of the first embodiment. The guide pin 13A and the guide hole 14A shown in FIG. 3 are not necessary because it also serves to guide the reciprocating motion of the mover 11, which is the above-described action.

FIG. 5A is a schematic diagram showing another modification of the polishing apparatus 8 according to Embodiment 2 of the present invention, and FIG. 5B shows the movable element 11, the base 10 and the grindstone 9 of FIG. It is a top view of a polish device when removed.
In this modification, a first spring hole 31A and a second spring hole 31B are formed on both sides of the yoke 15 of the fixed base 12 along the axial direction of the brake drum 2, respectively. The hole diameter of the first spring hole 31A is larger than the hole diameter of the second spring hole 31B. A highly rigid compression spring 21 is accommodated in the first spring hole 31A. A low-rigidity compression spring 22 is accommodated in the second spring hole 31B.
The guide hole 14 </ b> B has a gap between the guide pin 13 and the guide pin 13 that does not prevent the grindstone 9 from tilting along the axial direction of the brake drum 2.
Other configurations are the same as those of the polishing apparatus of the first embodiment.

In this example, when the grindstone 9 is pressed against the brake drum 2, as shown in FIG. 5A, the mover 11 has a displacement on the high-rigidity compression spring 21 side more than a displacement on the low-rigidity compression spring 22 side. Is also small.
Therefore, even if the grindstone 9 comes into contact with one piece, the grindstone 9 can follow and tilt, and the posture can be changed so that the contact surface pressure with the brake drum 2 becomes uniform. It can be reduced uniformly.

Embodiment 3 FIG.
6A is a front view showing the mover 24 of the polishing apparatus according to Embodiment 3 of the present invention, and FIG. 6B is a side view of FIG. 6A.
The mover 24 is made of non-magnetic material and has a permanent magnet 23 embedded therein. The permanent magnet 23 is not disposed opposite to the yoke 15 at the center position, is deviated to one side at the intermediate portion, and is provided on the opposite side of the yoke 15.
The reason why the permanent magnet 23 is displaced to one side with respect to the yoke 15 is to make the magnetic balance with the yoke 15 non-uniform in the plane of the yoke 15. This is to move the mover 24 along the axial direction of the brake drum 2 in a repulsive manner.
The permanent magnet 23 is provided on the opposite side of the yoke 15 to prevent the permanent magnet 23 from colliding with the fixed base 12 and being damaged when the grindstone 9 is separated from the braking surface of the brake drum 2. It is to do.
Other configurations are the same as those of the polishing apparatus 8 of the first embodiment.

  In this embodiment, when the energization of the electromagnetic coil 17 is interrupted, as shown in FIG. 7A, the mover 24 overlaps the fixed base 12, and the permanent magnet 23 is connected to the yoke 15. It is deviated to the left. At this time, the mover 24 is displaced toward the fixed base 12 against the elastic force of the compression spring 16 by the magnetic force of the permanent magnet 23, and the grindstone 9 is separated from the braking surface of the brake drum 2. Yes.

In the polishing apparatus 8 according to this embodiment, when the brake drum 2 is polished with the grindstone 9, first, a small current is applied to the electromagnetic coil 17 in the direction in which the permanent magnet 23 repels, whereby the grindstone 9 is made permanent. The brake drum 2 is pressed against the repulsive force of the magnet 23 and the elastic force of the compression spring 16. The current at this time is called a pressure contact current.
Next, a current larger than the pressure contact current is applied to the electromagnetic coil 17 in the direction in which the permanent magnet 23 repels the yoke 15, and the mover 24 is moved in the direction of arrow B as shown in FIG. Is moved, that is, moved along the axial direction of the brake drum 2. The current at this time is called an axial movement current.
When polishing the braking surface of the brake drum 2 using the grindstone 9, polishing is performed while reciprocating the grindstone 9 in the axial direction of the brake drum 2 by repeating energization in the range of the pressure contact current and the axial movement current. I do.
By doing so, even when the surface roughness of the braking surface is large, a uniformly smooth surface can be obtained after polishing, and the reliability of the device can be improved.

In addition, when the installation space of the polishing apparatus 8 of Embodiment 1 is wide, the polishing apparatus 8 itself may be driven along the axial direction of the brake drum 2.
FIG. 8 shows an example of this, and the polishing apparatus 8 is connected to a motor 36 and is guided by a linear guide 37 by the drive of the motor 36 so as to reciprocate along the axial direction of the brake drum 2. Yes.
Accordingly, the grindstone 9 can be reciprocated along the axial direction of the brake drum 2 while pressing the braking surface of the brake drum 2, and the relative position between the grindstone 9 and the brake drum 2 can be changed. The surface roughness of the braking surface of the brake drum 2 can be uniformly reduced by suppressing the contact of 9.

Embodiment 4 FIG.
FIG. 9 (a) is a front view schematically showing the main part of the polishing apparatus according to Embodiment 4 of the present invention, and FIG. 9 (b) is a side view of FIG. 9 (a).
In each of the above embodiments, the polishing apparatus 8 is separate from the hoisting machine 1, but the field 7 and armature 6 of the brake body 4 used in the hoisting machine 1 are diverted to the members of the polishing apparatus. It is also possible to polish the braking surface of the brake drum 2.
In this embodiment, as the shoe 5 for fixing the lining 3 of the brake body 4, an electromagnet built-in shoe 25 shown in FIG. 9A is used, and the grindstone 9 is fixed to the electromagnet built-in shoe 25 instead of the lining 3. doing.
The electromagnet built-in shoe 25 has a base 38, a support 39 fixed to the end of the base 38, a moving table 28 connected to the support 39 via a parallel leaf spring 27, and fixed to the moving table 28. The grindstone 9 is provided, and an electromagnet 26 that attracts and moves the moving base 28 along the axial direction of the brake drum 2 when energized.

In this embodiment, when the armature 6 of the brake device is energized, the moving table 28 moves in the radially inward direction of the brake drum 2, and the grindstone 9 is pressed against the braking surface of the brake drum 2.
When the electromagnet 26 is energized in this state, the moving table 28 is attracted to the electromagnet 26 by the electromagnetic force of the electromagnet 26 against the elastic force of the parallel leaf spring 27, and the grindstone 9 integrated with the moving table 28 is attached to the brake drum 2. It moves along the axial direction with the braking surface pressed.
Further, when the current of the electromagnet 26 is interrupted in this state, the grindstone 9 returns to the original state by the elastic force of the parallel leaf spring 27.
Thus, by repeatedly energizing and shutting off the electromagnet 26, the grindstone 9 can be reciprocated along the axial direction of the brake drum 2.

In this embodiment, the grinding wheel 9 is separated from the braking surface of the brake drum 2 by cutting off the energization of the armature 6 of the brake device, and the grinding of the braking surface by the grinding stone 9 is not performed.
The grinding of the braking surface by the grindstone 9 is such that the armature 6 is energized and the electromagnet 26 is repeatedly energized and shut off, so that the grindstone 9 reciprocates along the axial direction with the braking surface of the brake drum 2 pressed against it. Repeatedly, the braking surface is polished.
Therefore, by repeatedly energizing and interrupting the armature 6 and the electromagnet 26, the grindstone 9 can be intermittently pressed against the braking surface to polish the braking surface.

  In addition, a part of the brake device installed in the hoisting machine 1 can be diverted as a part of the polishing device for the brake drum 2, and the number of parts required for the polishing device can be reduced, resulting in cost Can be reduced.

FIG. 10 (a) is a modification of the polishing apparatus according to Embodiment 4 of the present invention, and is a front view schematically showing the main part, and FIG. 10 (b) is a side view of FIG. 10 (a). .
In this embodiment, the movable table 28 is connected to the support body 40 via the parallel leaf springs 29 on both sides.
Other configurations are the same as those of the polishing apparatus shown in FIGS.

In this embodiment, the movable table 28 is supported at both ends by a pair of parallel leaf springs 29, and the movable table 28 is given a large elastic force.
When the electromagnet built-in shoe 25 is incorporated in the brake device used in the large hoisting machine 1 and the braking surface of the brake drum 2 is polished, the pressure contact force of the grindstone 9 against the braking surface increases. Therefore, energization to the electromagnet 26 is cut off, and a large force is required for the moving base 28 to return to the original position. In this example, since the moving table 28 is given a large force by the pair of parallel leaf springs 29, the grindstone 9 can move smoothly along the axial direction of the brake drum 2.

In each of the above-described embodiments, the polishing apparatus for polishing the braking surface of the brake drum 2 of the brake apparatus installed in the hoisting machine 1 that is a rotating electrical machine has been described, but the present invention is not limited to this.
For example, the present invention can be applied to a polishing device for polishing a braking surface of a brake drum of a brake device installed in an industrial device such as a hoist or agricultural equipment, an automobile or the like.

  1 hoisting machine, 2 brake drums, 3 linings, 4 brakes, 5 shoes, 6 armatures, 7 fields, 8 grinding devices, 8a linear guides, 8b motors, 9 grinding wheels, 10 bases, 11, 24 movers, 12 fixed Base, 12a hook, 13 guide pin, 14 guide hole, 15 yoke, 16 compression spring, 17 electromagnetic coil, 18 O-ring, 19 first spacer, 20 second spacer, 21 high rigidity compression spring, 22 low rigidity compression Spring, 23 Permanent magnet, 25 Electromagnet built-in shoe, 26 Electromagnet, 27 Cantilevered parallel leaf spring, 28 Moving table, 29 Both-end supported leaf spring, 30 Guide hole, 31, 31A, 31B Spring hole, 32 Screw, 33 Ring hole , 34 Contact surface, 35 Hook (holding means), 36 Motor, 37 Linear guide, 38 Base, 3 , 40 support.

Claims (9)

A brake drum polishing device for polishing a braking surface of a brake drum of a brake device,
A fixed base having a yoke;
An electromagnetic coil that is an electromagnet configured by winding a conductive wire around the yoke;
A mover provided movably facing the fixed table;
A compression spring provided between the mover and the fixed base and biasing the mover toward the braking surface of the brake drum;
A base fixed to the mover;
A grinding wheel provided on the base and in surface contact with the braking surface;
The grindstone is separated from the braking surface against the elastic force of the compression spring by electromagnetic force generated by energization of the electromagnetic coil,
The current of the electromagnetic coil is interrupted and the grindstone is pressed against the braking surface by the elastic force of the compression spring,
An apparatus for polishing a brake drum, wherein the braking surface is polished by intermittently pressing the grinding wheel against the rotated braking surface by repeatedly energizing and shutting off the electromagnetic coil. A guide pin that has one end fixed to the mover and the other end is loosely inserted into a guide hole formed in the fixed base, and guides the movement of the mover;
An O-ring in the guide hole and attached to the guide pin;
2. The brake drum polishing apparatus according to claim 1, wherein the mover and the grindstone integrated with the mover are interlocked with fluctuations of the guide pin around the O-ring. One end of the compression spring is housed in a spring hole formed in the fixed base via a cylindrical first spacer, and the other end is attached to a cylindrical second spacer attached to the mover. Is stored,
The second spacer has a wall thickness smaller than that of the first spacer, and an end portion faces the spring hole,
2. The brake drum according to claim 1, wherein the mover and the grindstone integrated with the mover are interlocked with refraction of the compression spring between the first spacer and the second spacer. Polishing equipment. The compression springs are respectively housed in a pair of spring holes formed in the fixed base along the axial direction of the brake drum.
Of the pair of compression springs, one compression spring has high rigidity, and the other compression spring has low rigidity.
2. The polishing apparatus for a brake drum according to claim 1, wherein the mover and the grindstone integrated with the mover are inclined along the axial direction due to a difference in compression amount of the pair of compression springs. The brake drum polishing apparatus is connected to a motor via a linear guide,
The brake drum polishing apparatus according to any one of claims 1 to 4, wherein the motor is driven to reciprocate along the axial direction of the brake drum. A brake drum polishing device for polishing a braking surface of a brake drum of a brake device,
A fixed base having a yoke;
An electromagnetic coil that is an electromagnet configured by winding a conductive wire around the yoke;
A mover provided movably facing the fixed table;
A compression spring provided between the mover and the fixed base and biasing the mover toward the braking surface of the brake drum;
A base fixed to the mover;
A grinding wheel provided on the base and in surface contact with the braking surface;
The mover is made of a non-magnetic material, and has a permanent magnet embedded with being deviated to one side with respect to the yoke,
When energization of the electromagnetic coil is interrupted, the mover is displaced to the fixed base side by the magnetic force of the permanent magnet against the elastic force of the compression spring,
When the electromagnetic coil is energized, the permanent magnet repels the yoke, and the repelling force and the elastic force of the compression spring move the mover in the radially outward direction so that the grindstone is pressed against the braking surface. And
By energizing the electromagnetic coil with a larger current, the permanent magnet repels, and the repulsive force moves along the axial direction of the brake drum while the grindstone is pressed against the braking surface. And
An apparatus for polishing a brake drum, wherein the braking surface is polished by intermittently pressing the grinding wheel against the rotated braking surface by repeatedly energizing and shutting off the electromagnetic coil. A brake drum,
A field in which an electromagnetic coil is incorporated, an armature connected to the field and movable in the radial direction by energization of the electromagnetic coil, a shoe connected to the armature, and a brake surface of the brake drum attached to the shoe and attached to the shoe In a brake device having a brake body with a lining that makes surface contact,
A brake drum polishing apparatus for polishing the braking surface of the brake drum,
A base, a support fixed to the base, a moving base connected to the support through a parallel leaf spring, and an electromagnet that attracts the moving base by energization and moves along the axial direction of the brake drum An electromagnet built-in shoe having
A grindstone fixed to the moving table,
The electromagnet built-in shoe is incorporated in the brake device instead of the shoe, and the grindstone is incorporated in the brake device instead of the lining,
An apparatus for polishing a brake drum, wherein the braking surface is polished by intermittently pressing the grindstone against the rotated braking surface.   The brake drum polishing apparatus according to claim 7, wherein the movable table is supported at both ends by a pair of the parallel plate springs.   The brake drum polishing apparatus according to any one of claims 1 to 8, wherein the brake device is provided in an elevator hoisting machine.

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