U.S. patent application number 13/878783 was filed with the patent office on 2013-12-19 for self-centering clamping device and measuring device for a blade.
The applicant listed for this patent is Christian Baum, Ronny Jahnke. Invention is credited to Christian Baum, Ronny Jahnke.
Application Number | 20130334756 13/878783 |
Document ID | / |
Family ID | 43618658 |
Filed Date | 2013-12-19 |
United States Patent
Application |
20130334756 |
Kind Code |
A1 |
Baum; Christian ; et
al. |
December 19, 2013 |
SELF-CENTERING CLAMPING DEVICE AND MEASURING DEVICE FOR A BLADE
Abstract
A self-centering clamping device for a blade includes a mount
having a root reception orifice which has a contour adapted to a
root of the blade. The root reception orifice extends in the
vertical direction and has a vertically running groove for
receiving at least part of the root of the blade. A rotatable
roller is arranged in a lower region of the root reception orifice
and forms a stop for the root of the blade, a contact region of the
roller for the root lying in an angular range larger than 0.degree.
and smaller than 90.degree., and the angular range being oriented
upward and into the root reception orifice.
Inventors: |
Baum; Christian; (Berlin,
DE) ; Jahnke; Ronny; (Falkensee, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Baum; Christian
Jahnke; Ronny |
Berlin
Falkensee |
|
DE
DE |
|
|
Family ID: |
43618658 |
Appl. No.: |
13/878783 |
Filed: |
October 5, 2011 |
PCT Filed: |
October 5, 2011 |
PCT NO: |
PCT/EP2011/067367 |
371 Date: |
June 21, 2013 |
Current U.S.
Class: |
269/287 |
Current CPC
Class: |
B25B 5/14 20130101; F05D
2230/64 20130101; F01D 25/285 20130101; F01D 5/005 20130101 |
Class at
Publication: |
269/287 |
International
Class: |
F01D 25/28 20060101
F01D025/28 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 12, 2010 |
EP |
10187251.3 |
Claims
1-11. (canceled)
12. A self-centering clamping device for a blade, comprising: a
mount having a root reception orifice which has a contour adapted
to a root of the blade, wherein the root reception orifice extends
in the vertical direction and has a vertically running groove for
receiving at least part of the root of the blade, wherein a
rotatable roller is arranged in a lower region of the root
reception orifice and forms a stop for the root of the blade, a
contact region of the roller for the root lying in an angular range
larger than 0.degree. and smaller than 90.degree., and the angular
range being oriented upward and into the root reception
orifice.
13. The self-centering clamping device as claimed in claim 12,
wherein the roller has a rolling bearing.
14. The self-centering clamping device as claimed in claim 12,
wherein an axis of rotation of the roller is at an angle with
respect to the horizontal.
15. The self-centering clamping device as claimed in claim 12,
wherein the mount comprises a grooved block.
16. The self-centering clamping device as claimed in claim 12,
wherein the roller is arranged opposite a vertically running groove
orifice.
17. The self-centering clamping device as claimed in claim 16,
wherein a sliding roller is arranged above the roller and opposite
the groove orifice.
18. The self-centering clamping device as claimed in claim 17,
wherein a plurality of sliding rollers are arranged one above the
other.
19. The self-centering clamping device as claimed in claim 12,
wherein two rollers are provided.
20. The self-centering clamping device as claimed in claim 16,
wherein an eccentric for clamping the root is arranged opposite the
groove orifice.
21. The self-centering clamping device as claimed in claim 12,
wherein the root reception orifice is in the form of a blade
fastening groove.
22. A measuring device for a blade, comprising: a self-centering
clamping device as claimed in claim 12.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is the U.S. National Stage of International
Application No. PCT/EP2011/067367 filed Oct. 5, 2011 and claims
benefit thereof, the entire content of which is hereby incorporated
herein by reference. The International Application claims priority
to the European application No. 10187251.3 EP filed Oct. 12, 2010,
the entire contents of which is hereby incorporated herein by
reference.
FIELD OF INVENTION
[0002] The invention relates in general to a self-centering
clamping device and a measuring device for a blade. The invention
relates particularly to a self-centering clamping device and a
measuring device with a blade of a turbine, engine or
compressor.
BACKGROUND OF INVENTION
[0003] In the measurement of moments or geometric measurements, it
is important to fix and center the measurement objects exactly for
the purpose of exact measurement. The measurement objects must be
capable of being positioned quickly and reliably in a reproducible
way.
[0004] Conventionally, blades, such as turbine, engine or
compressor blades, are fixed in a grooved block with bracing by an
eccentric. Damage to the blade may occur during bracing.
[0005] GB 2 047 897 shows a device for the measurement of turbine
blades, with a groove for receiving the blade in a transverse
direction of the blade and with a bracing mechanism for bracing the
blade in a longitudinal direction of the blade.
[0006] U.S. Pat. No. 5,792,267 discloses a fastening device for a
turbine blade for the purpose of coating the blade, with a
cylindrical base block, with a groove receiving the root and with a
push-on sleeve and a cover for the block in order thereby to secure
the blade.
SUMMARY OF INVENTION
[0007] The object of the invention is to improve the fixing of
blades.
[0008] This object is achieved by the features of the independent
claim(s).
[0009] According to a first aspect of the invention, a
self-centering clamping device for a blade comprises a mount with a
root reception orifice which has a contour adapted to a root of the
blade. The root reception orifice extends in the vertical direction
and has a vertically running groove for receiving at least part of
the root of the blade, and a rotatable roller is arranged in a
lower region of the root reception orifice and forms a stop for the
root of the blade, a contact region of the roller for the root
lying in an angular range larger than 0.degree. and smaller than
90.degree., and the angular range being oriented upward and into
the root reception orifice.
[0010] When the blade is inserted into the reception orifice, the
blade is moved by gravity onto the roller functioning as a stop and
is thus centered automatically. Reliable positioning without
bracing is thus possible. On account of the movability of the
roller, wear caused by friction is prevented. Damage to the blade
is likewise avoided. The reception orifice is adapted essentially
to the set-up of a turbine or compressor wheel disk, thus making it
easier to position the blade. The arrangement of the roller make it
possible to apply the blade in that quadrant of the roller which
assists a downward movement of the blade by rotation. The blade
thus slides with low friction into the reception orifice.
[0011] The roller may have, in particular, a rolling bearing. By
means of a rolling bearing, for example in the form of a ball,
barrel or needle bearing, friction is reduced and reliability and
precision are increased. However, plane bearings may basically also
be considered as bearings for the roller.
[0012] An axis of rotation of the roller may be at an angle with
respect to the horizontal. By means of an inclined roller, the
centering of the blade can be further improved, since the blade, as
it were, may slip along the inclined circumferential surface of the
roller into the reception orifice.
[0013] The mount (5) may be a grooved block, thus making handling
easy.
[0014] The roller may be arranged opposite a vertically running
groove orifice. As a result of the arrangement of the roller, the
blade is pressed into the groove and is thereby fixed securely.
[0015] A sliding roller may be arranged above the roller and
opposite the groove orifice. The sliding roller makes it possible
for the blade to be introduced into and removed from the reception
orifice without any friction. In this case, in particular, a
plurality of sliding rollers may also be arranged one above the
other. This reduces the risk that the blade tilts and also, with
regard to larger blades, makes it possible to handle the blade in
the reception orifice in a simple way. Instead of the sliding
roller or sliding rollers, a sliding surface made from a material
having low friction may also be present.
[0016] Two rollers may be provided. The distribution of the weight
of the blade to two rollers makes it possible to have an even more
reliable clamping device. The two rollers may be inclined with
respect to one another in such a way that a type of funnel is
obtained for the blade.
[0017] Although not necessary, an eccentric for clamping the root
may be arranged opposite the groove orifice. In addition, an
eccentric may fix the blade if, for example, the clamping device
has to be moved together with the inserted blade for the purpose of
the workstep.
[0018] The root reception orifice may be in the form of a blade
fastening groove, thus making handling easier.
[0019] According to a second aspect of the invention, a measuring
device for a blade comprises a self-centering clamping device, as
described above. The measuring device likewise has the
abovementioned advantages and designs. By means of the measuring
device, for example, the blade can be positioned reliably and
reproducibly on a moment balance or a measuring apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The invention is described in more detail below by means of
the drawings.
[0021] FIG. 1 shows a perspective illustration of a measuring
device with self-centering clamping device according to the
invention.
[0022] FIG. 2 shows a sectional illustration of the measuring
device and of the self-centering clamping device in a side view
according to the invention.
[0023] FIG. 3 shows a sectional illustration of the measuring
device and of the self-centering clamping device in a top view
according to the invention.
[0024] FIG. 4 shows diagrammatically a contact region of the roller
according to the invention.
DETAILED DESCRIPTION OF INVENTION
[0025] The drawings serve merely to explain the invention and do
not restrict this. The drawings and the individual parts are not
necessarily true to scale. Identical reference symbols designate
identical or similar parts.
[0026] FIG. 1 shows a measuring device 1 with a clamping device 2
for a measurement object, such as, for example, a turbine blade or
a compressor blade 3 (referred to below as "blade"). The clamping
device 2 comprises a baseplate 4. By means of the baseplate 4, the
measuring device 1 is fastened to a moment balance, not
illustrated, or to an intermediate structure for measuring the
blade 3.
[0027] A mount 5 is fastened essentially vertically on the
baseplate 4. Formed in the mount 5 is a reception orifice 6 in
which a blade root 7 of the blade 3 is fastened. The mount 5 and
reception orifice 6 may be designed, for example, as a grooved
block. A plurality of sliding rollers 8 are arranged in the
reception orifice 6 and make it easy to insert the blade 3 into the
clamping device 2. By means of an inclined roller 9, the blade root
7 of the blade 3 is positioned securely and reproducibly in the
reception orifice 6.
[0028] FIG. 2 shows a sectional illustration of the measuring
device 1 with the roller 9 serving as a stop. Three sliding rollers
8 are arranged vertically one above the other in the mount 5.
[0029] Part of the sliding rollers 8 projects into the reception
orifice 6, specifically at a base region of the groove-shaped
reception orifice 6, that is to say opposite a vertically running
groove orifice. The sliding rollers 8 consequently assist the
insertion and removal of the blade 3.
[0030] Further sliding rollers 8 may be arranged at the two lateral
regions of the reception orifice 6. Two or only one sliding roller
8 may also be provided.
[0031] Arranged in the lower region of the reception orifice 6,
underneath the sliding rollers 8, is the roller 9 on which part of
the blade root 7 of the blade 3 lies and which consequently serves
as a movable stop.
[0032] The roller 9 is mounted rotatably about an axis of rotation
10. The roller 9 may be designed, for example, as a rolling bearing
with an inner fixed inner ring or inner core, with an outer
rotatable roller and with rolling bodies, such as, for example,
rollers or balls, arranged between them.
[0033] Instead of a roller, a cylinder, ball or similar body which
enables the blade 3 to roll may also be used as a stop for the
blade 3. Not the entire circumferential surface is needed for the
functions of a stop, and therefore a body which has only part of
the circumferential surface of, for example, a roller, cylinder or
ball may also be used as a stop.
[0034] With regard to the blade roots 7 shown in the exemplary
embodiment, the end faces 12 do not run at right angles
(90.degree.) to the side faces 13, but instead at an angle which
may lie between 30.degree. and 90.degree.. In the present exemplary
embodiment, therefore, the axis of rotation 10 of the roller 9 is
at an angle with respect to the horizontal. The axis of rotation 10
of the roller 9 is consequently not parallel to the axes of
rotation of the sliding rollers 8. Instead, the axis of rotation 10
is oriented parallel to the end face 12 of the blade root 7. If the
end faces 12 run at right angles (90.degree.) to the side faces 13,
it is advantageous if, instead of one roller 9, two rollers are
present, the axes of rotation of which run, in particular, in a
v-shaped manner with respect to one another.
[0035] The roller 9 is arranged with respect to the reception
orifice 6 in such a way that a contact region 11 of the roller 9
for the blade root 7 lies in an angular range larger than 0.degree.
to smaller than 90.degree., in particular 30.degree. to 60.degree.,
for example at an angle of about 45.degree., to the circumferential
surface of the roller 9 (cf. FIG. 4). In this case, the angular
range is measured from the horizontal upward, so that the angular
range is oriented upward and toward the reception orifice 6. This
ensures that the root 7 does not engage either tangentially, that
is to say at a virtual interface of a horizontal with the outer
face of the roller 9, or directly radially, that is to say at a
virtual interface of a vertical with the outer face of the roller
9. The horizontal and vertical in this case run through the center
point of the roller 9.
[0036] With tangential bearing contact, there is the risk that the
blade root 7 could move past the roller 9, while, in the case of
directly radial perpendicular contact, the rolling properties of
the roller 9 are not brought to bear. Since the blade root 7
impinges in the region between these two end points, the blade root
7 and as it were roll automatically into the end position on
account of its weight by means of the roller 9.
[0037] The roller 9 or part of the roller 9 may be elastically
deformable in order to make it possible to adapt the roller 9 to
the blade root 7. The width of the roller 9 may be dimensioned
according to the conditions of the blade 3, although the roller 9
should have a minimum width which keeps the pressure load for the
blade 3 and for the roller 9 within tolerable limits. The diameter
of the roller 9 and its orientation should be dimensioned in such a
way that impingement of the blade 3 in the correct circumferential
region and subsequent rolling are possible.
[0038] Alternatively, two rollers may be provided, which are then
advantageously inclined with respect to one another and form a
funnel or V-shaped stop into which the blade root 7 can slide.
[0039] An optional eccentric for clamping the blade root 7 may be
arranged opposite the vertically running groove orifice, that is to
say in the region of the sliding rollers 8. For example, the middle
of the three sliding rollers 8 will be replaced by an eccentric
which can additionally brace the blade 3, for example for transport
purposes.
[0040] FIG. 3 shows the measuring device 1 in a sectional
illustration in a top view. The baseplate 4 can be fastened to a
moment balance by means of screws, pins, bolts or similar fastening
means. The reception orifice 6 formed in the mount 5 is adapted in
its contour to the blade root 7 of the blade 3 in order to ensure
secure fixing of the blade 3. In particular, side regions of the
reception orifice 6 taper conically so as to be adapted to the
blade root 7.
[0041] The reception orifice 6 may contain a groove or be designed
as a groove, in particular it can be adapted to a blade fastening
groove into which the blade 3 is finally mounted. The sliding
rollers 8 and the roller 9 are arranged in a rearward part or base
region of the reception orifice 6, said rearward part or base
region being arranged opposite a vertically running groove
orifice.
[0042] The measuring device 1 is used as described below: first,
the measuring device 1 is fastened to a moment balance or a similar
measuring instrument. The blade root 7 of the blade 3 is
subsequently introduced into the reception orifice 6 of the
clamping device 2 until the blade root 7 comes to bear on the
roller 9. In this case, the sliding rollers 8 assist frictional
movement of the blade root 7 in the reception orifice 6. The blade
3 is self-centered by means of the roller 9. As a result of
gravity, the blade 3 slides through the reception orifice 6 until
it is fixed to the roller 9.
[0043] After measurement has taken place, the blade 3 is drawn out
of the reception orifice 6 and is in this case assisted again by
the sliding rollers 8.
* * * * *