AU2022200597B2 - Maintenance device and maintenance method for rotary machine - Google Patents
Maintenance device and maintenance method for rotary machine Download PDFInfo
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- AU2022200597B2 AU2022200597B2 AU2022200597A AU2022200597A AU2022200597B2 AU 2022200597 B2 AU2022200597 B2 AU 2022200597B2 AU 2022200597 A AU2022200597 A AU 2022200597A AU 2022200597 A AU2022200597 A AU 2022200597A AU 2022200597 B2 AU2022200597 B2 AU 2022200597B2
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- Australia
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- whetstone
- stopper
- rotary machine
- grinding
- fittingly
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- 238000012423 maintenance Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 17
- 238000003825 pressing Methods 0.000 claims description 9
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 13
- 238000007689 inspection Methods 0.000 description 5
- 230000000717 retained effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Motor Or Generator Current Collectors (AREA)
- Manufacture Of Motors, Generators (AREA)
- Pinball Game Machines (AREA)
- General Factory Administration (AREA)
- Crushing And Grinding (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The present invention reduces maintenance cost of a
rotary machine product and enhances an environmental value
of the rotary machine product by extending a service life
5 of a whetstone. A maintenance device of the present
invention for a rotary machine, the maintenance device
rotating a shaft of the rotary machine with a whetstone
pressed against a slip ring by means of a rod in the rotary
machine, the slipring fixed to the shaft, and the
10 maintenance device comprises: the whetstone; a whetstone
stopper that fittingly supports the whetstone; and a
whetstone holder that fixedly fastens the whetstone stopper
to the rod and presses down the whetstone stopper by a
predetermined quantity, wherein the whetstone stopper
15 fittingly supports the whetstone in radially inward and
outward directions and both circumferential directions of
the shaft, and wherein the whetstone stopper is configured
to allow the whetstone to be extracted in an axial
direction of the shaft.
20
1/3
FIG. I
11
5 1
10
43
FIG. 2
131
5- - -- - -- - --
p/ N
14 8a ,.
4
Description
1/3
11
1 10
43
FIG. 2
131
p/ N 14 8a 5- - ,. -- - -- - --
Australian Patents Act 1990
Invention Title Maintenance device and maintenance method for rotary machine
The following statement is a full description of this invention, including the best method of performing it known to me/us:- la
[0001]
The present invention relates to a maintenance device
and a maintenance method for a rotary machine. The
maintenance device grinds a sliding surface of a slip ring
during the operation of the rotary machine.
[0002]
In a rotary machine including a slip ring, the slip
ring encounters adhesion of foreign matters, contamination,
seizing, or fine surface roughness such as pearskin on its
surface (sliding surface) because of vibrations, impacts,
current capacity shortage, ambient temperature, and others
during the operation of an electric motor or electric
generator.
[0003]
Document JP H0553186(U) discloses a following
technique. One of brushes in a brush holder is removed and
a whetstone of the same size as that of the brush is fitted
in the brush holder. The slip ring is ground by rotating
an electric motor while pressing down the whetstone with a
pressing clasp for brush or pressing down an upper part of
the whetstone with a dedicated holder.
[0004]
Document JP H0553186(U) further discloses a structure
for connecting a grinding device (maintenance device) different from the brush holder to the brush holder by means of a connecting bolt and a grinding-margin adjusting technique where a plate spring pushing a whetstone on a back side thereof is locked by setting the height of a grinding margin adjustment mechanism.
[0005]
The whetstone disclosed in document JP H0553186(U)
has one grinding surface and will be disposed of or
recycled when the thickness of the grinding surface is
decreased to a predetermined grinding margin.
[0006]
In recent years, however, activities are intensified
for realizing a sustainable society of high environmental
value, requiring a long service life of the whetstone from
the viewpoint of waste reduction.
[0007]
The present invention reduces maintenance cost of a
rotary machine product and enhances an environmental value
of the rotary machine product by extending a service life
of a whetstone in the maintenance device.
[0008]
The present disclosure provides various embodiments
of a maintenance device and a maintenance method, examples of which are as follows.
[0009]
In one broad form, the present invention seeks to
provide a maintenance device for a rotary machine, the
maintenance device rotating a shaft of the rotary machine
with a whetstone pressed against a slip ring by means of a
rod in the rotary machine, the slip ring fixed to the shaft,
and the maintenance device comprising: the whetstone; a
whetstone stopper having a fitting hole that fittingly
supports the whetstone, wherein the whetstone includes side
surfaces fittingly supported by the whetstone stopper, and
a plurality of side surfaces used for grinding,
wherein the side surfaces used for grinding are different
surfaces from the side surfaces fittingly supported by the
whetstone stopper, wherein the plurality of the side
surfaces used for grinding are opposed to each other,
wherein if the whetstone is turned around and fitted in the
fitting hole again after one of the side surfaces used for
grinding is used there is no influence on the fittingly
support of the whetstone, and wherein the whetstones are
configured to be vertically symmetrical with respect to a
line or are configured to have rotational symmetries; and a
whetstone holder that fixedly fastens the whetstone stopper
to the rod and presses down the whetstone stopper by a
predetermined quantity, wherein the whetstone stopper fittingly supports the whetstone in radially inward and outward directions and both circumferential directions of the shaft, and wherein the whetstone stopper is configured to allow the whetstone to be extracted in an axial direction of the shaft.
[0010]
In one embodiment, each of the plurality of the side
surfaces used for grinding has a larger width than a width
of each of the side surfaces fittingly supported by the
whetstone stopper.
[0011]
In one broad form, the present invention seeks to
provide a maintenance method for a rotary machine, the
method including grinding a slip ring of the rotary machine
using a maintenance device as described herein by pressing
the whetstone against the slip ring.
[0011a]
In one embodiment, when it is necessary to replace
the whetstone, the method further comprises turning around
the whetstone through lateral rotation or reversal and then
fittingly supporting the whetstone again in the whetstone
stopper.
[0012]
According to the present invention, the maintenance
cost of the rotary machine product is reduced and the
4a
environmental value of the rotary machine product is
enhanced by extending the service life of the whetstone in
the maintenance device.
[0013]
Fig. 1 is a schematic sectional view showing a state
where a slip ring of an electric generator is ground;
Fig. 2 is a diagram showing an exemplary installation
of a maintenance device as seen in an axial direction of
the electric generator;
Fig. 3 is a set of diagrams showing cross-sectional
shapes of a whetstone;
Fig. 4 is a set of diagrams showing cross-sectional
shapes of a whetstone stopper;
Figs. 5A to 5C are a set of diagrams showing planar
shapes of the whetstone; and
Fig. 6 is a flow chart showing an operation flow of a maintenance method.
[0014]
The embodiments of the present invention will be
described below with reference to the drawings. In the
first embodiment, a maintenance device for a rotary machine
is described taking an electric generator as an example of
a rotary machine including a slip ring. In the second
embodiment, a maintenance method is described.
First Embodiment
[0015]
Fig. 1 is a schematic sectional view showing a state
where a slip ring of an electric generator is ground. As
shown in Fig. 1, the electric generator of the embodiment
includes in a main body frame 1 thereof, a shaft 10 rotated
by an engine (not shown), a rotor 2 fixed to the shaft 10,
a stator 3 opposed to the rotor 2 with a predetermined gap
in a radial direction of the rotor 2, and four slip rings 4
fixed to the shaft 10.
[0016]
The slip ring 4 is a component of a power supply
device for supplying electric power to the rotor 2. The
slip ring 4 is wired and connected to a coil of the rotor 2.
Since the shaft 10 is directly connected to the engine, the
slip rings 4 can be ground by using idling rotation of the
engine. In this operation, a grinding device 11 is used as
a maintenance device requiring no human contact for safety
purpose.
[0017]
The electric generator shown in Fig. 1 includes an
inspection cover 12 at a part of the main body frame 1.
When an inspection is performed, this cover is opened for
an inspection of an inner structure. During normal
operations, for example, brush holders are mounted on two
rods 5 axially extending from the main body frame 1. When
the slip ring of Fig. 1 is ground, the grinding device 11
is installed on the rods 5 in place of the brush holders.
Then, a whetstone 7 retained by the grinding device 11 is
pressed against a surface of the slip ring 4 under the
pressure of a pressing clasp. The slip ring 4 is rotated
by the idling rotation of the engine and whereby the
surface of the slip ring 4 is ground.
[0018]
Fig. 2 is a diagram showing an exemplary installation
of the grinding device 11 as seen in an axial direction of
the electric generator. The grinding device 11 of the
present embodiment includes a whetstone holder 6, the
whetstone 7, and a whetstone stopper (lower whetstone stopper 8a and upper whetstone stopper 8b).
[0019]
[Whetstone Holder 6]
The whetstone holder 6 supports the whetstone 7 and
the whetstone stopper in a manner to allow the whetstone 7
and the whetstone stopper to move in a normal direction of
the slip ring 4. The whetstone holder 6 applies pressure
to the whetstone 7 and the whetstone stopper 8 so as to
press down the whetstone 7 against the slip ring 4. More
specifically, the whetstone holder 6 includes a whetstone
stopper pressing-clasp 13 for applying pressure to press
down the whetstone 7 against the slip ring 4 via the
whetstone stopper, and two fastener members 14 for
fastening and fixing the whetstone holder 6 with the rods 5
inserted therein.
[0020]
[Whetstone 7]
A left-hand diagram of Fig. 3 is a plan view of the
whetstone 7 (a view seen in the axial direction of the
shaft 10). A right-hand diagram of Fig. 3 is a side view
of the whetstone 7 (a view seen in the radial direction of
the shaft 10). As shown in Fig. 3, the whetstone 7 has a
hexagonal-column shape with a hexagonal shape as seen in
the plan view of Fig. 3. The whetstone 7 is fittingly
supported in a fitting hole of the whetstone stopper 8 in a manner that the upper and lower surfaces (7a, 7b) of the hexagonal shape work as grinding surfaces and the four lateral sides 7c of the hexagonal shape work as support surfaces.
[0021]
[Whetstone Stopper 8]
The whetstone stopper 8 mechanically controls the
grinding amount of the whetstone 7 in cooperation with the
whetstone holder 6. Since the grinding of the slip ring 4
in the present embodiment uses the idling rotation of the
engine, the rotation of the shaft 10 cannot be controlled
for the grinding purpose. However, excessive grinding is
prevented by using the whetstone stopper 8 for mechanically
controlling the grinding amount of the whetstone 7. The
whetstone stopper 8 includes the lower whetstone stopper 8a
and the upper whetstone stopper 8b.
[0022]
The lower whetstone stopper 8a has a surface opposed
to the slip ring 4, from which the whetstone 7 is exposed
and protruded. The lower whetstone stopper 8a has a
fitting hole through which the whetstone 7 is possible to
be fitted in the front direction in Fig. 2 (axial direction
of the shaft 10). This fitting hole is designed to prevent
the displacement (movement) of the whetstone 7 in vertical
and horizontal directions (radial directions and circumferential directions of the shaft 10) in Fig. 2.
[0023]
The upper whetstone stopper 8b is disposed atop the
lower whetstone stopper 8a and configured to fittingly
support the lower whetstone stopper 8a in a vertical
direction in Fig. 2 (radial direction of the shaft 10).
[0024]
A left-hand diagram of Fig. 4 is a plan view (as seen
in the axial direction of the shaft 10) of the whetstone
stopper 8. A right-hand diagram of Fig. 4 is a side view
(as seen in the radial direction of the shaft 10) of the
whetstone stopper 8. As shown in the left-hand diagram of
Fig. 4, the lower whetstone stopper 8a, which has a
rectangular parallelepiped shape, has the fitting hole in
its lower part. The fitting hole is capable of fittingly
fixing the whetstone 7. Specifically, a lower part of the
fitting hole has a height d2 smaller than a height dl of an
upper part of the fitting hole (d1>d2) such that a lower
side 7b of the whetstone 7 is exposed by a height d3. That
is, the fitting hole has smaller depth such that a bottom
side of the fitting hole is higher than a bottom surface of
the whetstone 7.
[0025]
The slip ring 4 rotates to the right or the left in
Fig. 2. Hence, the whetstone 7 is pushed in the rotational direction due to a frictional force. Further, the whetstone is also subjected to a pressing force by the whetstone-stopper pressing-clasp 13 and the reaction force thereof. However, the lateral sides 7c of the whetstone 7 come in contact with lateral sides of the fitting hole of the lower whetstone stopper 8a so that the vertical and lateral displacements (movements) of the whetstone 7 in the plan view caused by these forces are prevented. After the end of the rotation of the slip ring 4, the whetstone 7 fittingly supported in the horizontal direction in Fig. 2 and the left-hand diagram of Fig. 4 can be easily extracted in a front-back direction in the left-hand diagram of Fig.
4. Therefore, an adhesive agent is unnecessary for fixing
the whetstone 7 and, when the whetstone 7 is replaced, the
steps of applying and removing the adhesive agent is not
needed.
[0026]
As described above, the whetstone 7 in the present
embodiment is configured such that corners defined between
the upper side and the lateral sides, corners defined
between the lower side and the lateral sides, and corners
defined between the lateral sides are not used for grinding,
and the state of fittingly supporting the whetstone 7 in
the fitting hole of the lower whetstone stopper 8a is not
affected by attrition due to the grinding. Therefore, both of the upper side and the lower side of the whetstone 7 are usable for the grinding surface.
[Modifications of Whetstone]
Figs. 5A to 5C are a set of diagrams showing planar
shapes of the whetstone. The exemplary plan views of Fig.
1 to Fig. 4 show examples of the hexagonal shape where a
pair of upper and lower sides in opposed relation have a
large width. The planar shape of the whetstone may also
include, as shown in Fig. 5A to 5C, a cross shape obtained
by squarely cutting off four corners of a square, a shape
obtained by rounding off the corners of a square, and a
shape obtained by tapering the corners of a square. These
examples are also characterized in that the whetstone 7 has
plural grinding surfaces by differentiating lateral sides
used for fittingly support from lateral sides used for
grinding. Because the lateral sides used for fittingly
support are differentiated from the lateral sides used for
grinding, if the whetstone 7 is turned around and fitted in
the fitting hole again after one grinding surface is used,
there is no influence on the fittingly support of the
whetstone. Note that, when the whetstone in Figs. 5A to 5C
is used, the fitting hole of the lower whetstone stopper 8a
has a configuration corresponding to the whetstone being
used.
[Types of Whetstones and Fitting Holes]
In the examples of Fig. 1 to Fig. 5C, the whetstones
are configured to be vertically symmetrical with respect to
a line or configured to have rotational symmetries through
1800. The whetstones may also be configured to have
rotational symmetries through 90°. Specifically, as the
planar shapes shown in Fig. 1 to Fig. 5C, a distance
between the upper and the lower surfaces is vertically
increased to form N polygon (N>5) having line symmetry or
rotation symmetry through 90° or 1800 such as regular
hexagon or regular octagon. Otherwise, corners of a
polygon are made uneven or tapered. The whetstone may have
any other shape that has plural sides not used for grinding
besides the lateral sides used for fitting support.
Second Embodiment
[0027]
In the second embodiment, the maintenance method is
described. Fig. 6 shows an operating procedure.
[0028]
In a first operating step S1 in Fig. 6, normal
operations are stopped to grind the slip ring by way of an
inspection. In preparatory steps to the grinding of slip
ring, brush holders and brushes are first removed in Step
S2. In Step S3, the grinding device 11 is mounted to the
rods 5 with the fastener members 14. At this time, the whetstone stopper 8 for retaining the whetstone 7 is already mounted to the whetstone holder 6. This state is shown in Fig. 2. The whetstone 7 has a grinding surface 7b contacted against the slip ring so as to grind the slip ring.
[0029]
In Step S4, the grinding device starts a grinding
operation by starting the engine. In Step S5,
determination is made as to whether the replacement of the
whetstone is necessary or not. If there is no need for
replacing the whetstone, the operation proceeds to Step S6
to determine whether it is necessary or not to continue the
grinding operation.
[0030]
When it is necessary to replace the whetstone, the
electric generator is stopped in Step S7 so as to extract
the whetstone 7 from the grinding device 11. The whetstone
7 is extracted by pulling out the whetstone 7 fittingly
retained in the whetstone stopper 8 to the front side in
Fig. 2. In Step S8, the whetstone is reversed vertically
for the upper surface and the lower surface. In Step S9,
the whetstone 7 is positioned to bring a grinding surface
7a thereof in contact with the slip ring and is fittingly
retained by the whetstone stopper 8. Subsequently, the
operation returns to Step S4 to restart the electric generator and to perform the grinding operation again.
[0031]
If it is determined in Step S6 that it is unnecessary
to continue the grinding operation, the normal operations
are restored by performing the operation Steps S10, Sl,
S12, which correspond to S3, S2, 51, respectively.
[0032]
Throughout this specification and the claims which
follow, unless the context requires otherwise, the word
"comprise", and variations such as "comprises" and
"comprising", will be understood to imply the inclusion of
a stated integer or step or group of integers or steps but
not the exclusion of any other integer or step or group of
integers or steps.
[0033]
The reference in this specification to any prior
publication (or information derived from it), or to any
matter which is known, is not, and should not be taken as
an acknowledgment or admission or any form of suggestion
that that prior publication (or information derived from
it) or known matter forms part of the common general
knowledge in the field of endeavor to which this
specification relates.
[0034]
1: main body frame
2: rotor
3: stator
4: slip ring
5: rod
6: whetstone holder
7: whetstone
8a: lower whetstone stopper
8b: upper whetstone stopper
10: shaft
11: grinding device
12: inspection cover
13: pressing clasp for whetstone stopper
14: fastener member
dl to d3: height
Claims (4)
1. A maintenance device for a rotary machine, the
maintenance device rotating a shaft of the rotary machine
with a whetstone pressed against a slip ring by means of a
rod in the rotary machine, the slip ring fixed to the shaft,
and the maintenance device comprising:
the whetstone;
a whetstone stopper having a fitting hole that
fittingly supports the whetstone, wherein the whetstone
includes
side surfaces fittingly supported by the
whetstone stopper, and
a plurality of side surfaces used for grinding,
wherein the side surfaces used for grinding are different
surfaces from the side surfaces fittingly supported by the
whetstone stopper, wherein the plurality of the side
surfaces used for grinding are opposed to each other,
wherein if the whetstone is turned around and fitted in the
fitting hole again after one of the side surfaces used for
grinding is used there is no influence on the fittingly
support of the whetstone, and wherein the whetstones are
configured to be vertically symmetrical with respect to a
line or are configured to have rotational symmetries; and
a whetstone holder that fixedly fastens the whetstone
stopper to the rod and presses down the whetstone stopper by a predetermined quantity, wherein the whetstone stopper fittingly supports the whetstone in radially inward and outward directions and both circumferential directions of the shaft, and wherein the whetstone stopper is configured to allow the whetstone to be extracted in an axial direction of the shaft.
2. The maintenance device for the rotary machine
according to claim 1, wherein each of the plurality of the
side surfaces used for grinding has a larger width than a
width of each of the side surfaces fittingly supported by
the whetstone stopper.
3. A maintenance method for a rotary machine,
the method including grinding a slip ring of the rotary
machine using a maintenance device of claim 1 or claim 2 by
pressing the whetstone against the slip ring.
4. The maintenance method of claim 3, wherein, when
it is necessary to replace the whetstone, the method
further comprises turning around the whetstone through
lateral rotation or reversal and then fittingly supporting
the whetstone again in the whetstone stopper.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-042140 | 2021-03-16 | ||
| JP2021042140A JP7429203B2 (en) | 2021-03-16 | 2021-03-16 | Rotating machine maintenance equipment and maintenance method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2022200597A1 AU2022200597A1 (en) | 2022-10-06 |
| AU2022200597B2 true AU2022200597B2 (en) | 2023-11-16 |
Family
ID=83426374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2022200597A Active AU2022200597B2 (en) | 2021-03-16 | 2022-01-31 | Maintenance device and maintenance method for rotary machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7429203B2 (en) |
| AU (1) | AU2022200597B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7139580B2 (en) * | 2017-07-07 | 2022-09-21 | 株式会社三洋物産 | game machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53121105A (en) * | 1977-03-31 | 1978-10-23 | Hitachi Ltd | Polisher for rotary current collector unit of rotary machine |
| JPS5837775U (en) * | 1981-09-04 | 1983-03-11 | 三菱電機株式会社 | Vehicle generator |
| JPH0553186U (en) * | 1991-12-24 | 1993-07-13 | 川崎製鉄株式会社 | Wire wound type motor slip ring polishing machine |
| JPH0675652U (en) * | 1993-04-07 | 1994-10-25 | 日本鋼管株式会社 | Grinding device for steel plate surface inspection |
| US20130065496A1 (en) * | 2010-05-21 | 2013-03-14 | Honda Motor Co., Ltd. | Grindstone, grindstone manufacturing method, boring tool, abrasive grain positioning jig, and relief surface forming method |
| US20180290265A1 (en) * | 2015-05-11 | 2018-10-11 | Shin-Etsu Handotai Co., Ltd. | Grinding wheel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5834571B2 (en) | 2011-07-20 | 2015-12-24 | ブラザー工業株式会社 | Image processing device |
| CN208005396U (en) | 2017-11-13 | 2018-10-26 | 中国铝业股份有限公司 | A kind of steam turbine carbon brush slip-ring milling tools device |
| CN109352477A (en) | 2018-10-22 | 2019-02-19 | 中铝西南铝冷连轧板带有限公司 | A kind of motor sliding ring on-line grinding device |
-
2021
- 2021-03-16 JP JP2021042140A patent/JP7429203B2/en active Active
-
2022
- 2022-01-31 AU AU2022200597A patent/AU2022200597B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53121105A (en) * | 1977-03-31 | 1978-10-23 | Hitachi Ltd | Polisher for rotary current collector unit of rotary machine |
| JPS5837775U (en) * | 1981-09-04 | 1983-03-11 | 三菱電機株式会社 | Vehicle generator |
| JPH0553186U (en) * | 1991-12-24 | 1993-07-13 | 川崎製鉄株式会社 | Wire wound type motor slip ring polishing machine |
| JPH0675652U (en) * | 1993-04-07 | 1994-10-25 | 日本鋼管株式会社 | Grinding device for steel plate surface inspection |
| US20130065496A1 (en) * | 2010-05-21 | 2013-03-14 | Honda Motor Co., Ltd. | Grindstone, grindstone manufacturing method, boring tool, abrasive grain positioning jig, and relief surface forming method |
| US20180290265A1 (en) * | 2015-05-11 | 2018-10-11 | Shin-Etsu Handotai Co., Ltd. | Grinding wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7429203B2 (en) | 2024-02-07 |
| AU2022200597A1 (en) | 2022-10-06 |
| JP2022142120A (en) | 2022-09-30 |
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