U.S. patent application number 11/569528 was filed with the patent office on 2007-12-13 for sheath provided with a corrugated edge for a pressing device.
This patent application is currently assigned to VOITH PATENT GmbH. Invention is credited to Dirk Hoeckelmann, Ruediger Kurtz, Uwe Matuschczyk, Jens Mueller, Josef Schneid, Andreas Schuette.
Application Number | 20070284072 11/569528 |
Document ID | / |
Family ID | 34961397 |
Filed Date | 2007-12-13 |
United States Patent
Application |
20070284072 |
Kind Code |
A1 |
Schneid; Josef ; et
al. |
December 13, 2007 |
Sheath Provided With A Corrugated Edge For A Pressing Device
Abstract
A sheath for a pressing device, the sheath having a cylindrical
circumferential face having a circumferential face radius and an
annular bearing resiliently mounted to at least one axial end of
the sheath in a spring elastic manner. The annular bearing has a
smaller radius than the circumferential face radius. Additionally,
the sheath has a bellows-shaped transition region extending at the
at least one axial end of the sheath from the cylindrical
circumferential face to the annular bearing.
Inventors: |
Schneid; Josef; (Vogt,
DE) ; Kurtz; Ruediger; (Heidenheim, DE) ;
Mueller; Jens; (Ravensburg, DE) ; Schuette;
Andreas; (Heidenheim, DE) ; Hoeckelmann; Dirk;
(Neuss, DE) ; Matuschczyk; Uwe; (Geislingen,
DE) |
Correspondence
Address: |
GREENBLUM & BERNSTEIN, P.L.C.
1950 ROLAND CLARKE PLACE
RESTON
VA
20191
US
|
Assignee: |
VOITH PATENT GmbH
Sankt Poeltener Strasse 43
Heidenheim
DE
89522
|
Family ID: |
34961397 |
Appl. No.: |
11/569528 |
Filed: |
March 22, 2005 |
PCT Filed: |
March 22, 2005 |
PCT NO: |
PCT/EP05/51310 |
371 Date: |
April 25, 2007 |
Current U.S.
Class: |
162/358.3 ;
162/205 |
Current CPC
Class: |
D21F 3/0227 20130101;
D21F 3/0245 20130101 |
Class at
Publication: |
162/358.3 ;
162/205 |
International
Class: |
D21F 3/02 20060101
D21F003/02 |
Foreign Application Data
Date |
Code |
Application Number |
May 27, 2004 |
DE |
10 2004 025 944.5 |
Claims
1-21. (canceled)
22. A sheath for a pressing device, the sheath comprising: a
cylindrical circumferential face having a circumferential face
radius; an annular bearing resiliently mounted to at least one
axial end of the sheath in a spring elastic manner, the annular
bearing having a smaller radius than the circumferential face
radius; and a bellows-shaped transition region extending at the at
least one axial end of the sheath from the cylindrical
circumferential face to the annular bearing.
23. The sheath according to claim 22, wherein the pressing device
is a paper machine.
24. The sheath according to claim 22, wherein the bellows-shaped
transition region is structured in one piece with the sheath
circumferential face.
25. The sheath according to claim 22, the pressing device further
comprising: a circular end disk mounted axially on the pressing
device; and a support face on the circular end disk forming the
annular bearing.
26. The sheath according to claim 22, further comprising individual
tabs individually fastenable to the annular bearing, wherein the
bellows-shaped transition region merges into the individual
tabs.
27. The sheath according to claim 22, further comprising: a bulge
formed by the bellows-shaped transition region; and a filler body
arranged in the bulge.
28. The sheath according to claim 27, wherein the filler body is
structured in a spring-elastic configuration.
29. The sheath according to claim 27, wherein the filler body is
provided in the bulge between the edge region and the annular
bearing.
30. The sheath according to claim 27, further comprising a torus
halved in a radial direction with regard to a torus center point,
wherein the filler body is formed by the torus.
31. The sheath according to claim 27, the pressing device further
comprising: an inner region of the pressing device; and a circular
end disk mounted axially on the pressing device, wherein the filler
body seals the inner region of the pressing device, in at least one
of an at least partially gastight and an at least partially
liquidtight manner, between the sheath and the end disk at the
bellows-shaped transition region.
32. The sheath according to claim 27, further comprising a
pressurized tube, wherein the filler body is formed by the
pressurized tube.
33. The sheath according to claim 27, further comprising a
spring-elastic torus body of solid configuration, wherein the
filler body is formed by the spring-elastic torus body of solid
configuration.
34. The sheath according to claim 33, wherein the filler body is of
open-pore configuration.
35. The sheath according to claim 33, wherein the filler body is of
closed-pore configuration.
36. The sheath according to claim 31, wherein the inner region is
filled with a filler medium at a preselected pressure.
37. The sheath according to claim 22, further comprising a laid
fabric layer structured and arranged in the sheath and extending
over the sheath circumferential face and over the bellows-shaped
transition region to the annular bearing.
38. The sheath according to claim 22, further comprising a laid
fabric layer structured and arranged in the sheath and extending
over the sheath circumferential face
39. The sheath according to claim 38, further comprising an
additional laid fabric layer overlapping the laid fabric layer and
extending over the sheath circumferential face and over the
bellows-shaped transition region to the annular bearing.
40. The sheath according to claim 39, further comprising an
overlapping region, wherein the additional laid fabric layer is
spliced onto the laid fabric layer in the overlapping region.
41. The sheath according to claim 22, wherein the sheath
circumferential face and the bellows-shaped transition region are
composed of a same material.
42. The sheath according to claim 22, wherein the bellows-shaped
transition region is one of cast onto and adhesively bonded to the
sheath circumferential face.
43. The sheath according to claim 22, wherein a radial compliance
of the bellows-shaped transition region and the sheath
circumferential face corresponds at most to 90% of a difference
between the circumferential face radius and the annular bearing
radius.
44. The sheath according to claim 22, wherein the pressing device
is a roll.
45. The sheath according to claim 22, wherein the pressing device
is a shoe press of a paper machine.
46. The sheath according to claim 22, wherein the sheath at least
partially surrounds the pressing device.
47. The sheath according to claim 22, wherein the bellows-shaped
transition region is arranged between the circumferential face
radius and the annular bearing radius.
48. A pressing device, comprising: a cylindrical circumferential
face having a circumferential face radius; a sheath having a sheath
circumferential face and at least one axial end; at least one end
of the sheath resiliently mounted to an annular bearing in a spring
elastic manner, the annular bearing having a smaller radius than
the circumferential face radius; and a bellows-shaped transition
region extending at the at least one axial end of the sheath from
the sheath circumferential face to the annular bearing.
49. The pressing device according to claim 48, wherein the sheath
at least partially surrounds the pressing device.
50. The pressing device according to claim 48, wherein the
bellows-shaped transition region is arranged between the sheath
circumferential face and the annular bearing.
51. A method of attaching a sheath to a pressing device,
comprising: arranging the sheath having a sheath circumferential
face and at least one axial end at least partially around the
pressing device having a cylindrical circumferential face having a
circumferential face radius; resiliently mounting at least one end
of the sheath to an annular bearing in a spring elastic manner, the
annular bearing having a smaller radius than the circumferential
face radius; and forming a bellows-shaped transition region
extending at the at least one axial end of the sheath from the
sheath circumferential face to the annular bearing.
52. The method according to claim 51, further comprising arranging
a filler body in a bulge formed by the bellows-shaped transition
region.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a U.S. National Stage Application
of International Application No. PCT/EP2005/051310 filed Mar. 22,
2005, which published as WO 2005/116331 A1 Dec. 8, 2005, the
disclosure of which is expressly incorporated by reference herein
in its entirety. Further, the present application claims priority
under 35 U.S.C. .sctn.119 and .sctn.365 of German Application No.
10 2004 025 944.5 filed May 27, 2004.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a sheath for a pressing device, in
particular a paper machine, the sheath surrounding the pressing
device at least partially and the circumferential face of the
sheath having substantially the shape of a cylinder circumferential
face, the sheath being configured such that it is resilient in a
spring-elastic manner. Furthermore, the invention relates to a
pressing device having a sheath of this type.
[0004] 2. Description of Background Information
[0005] In modern paper machines, rolls, between which the running
material web is guided and is frequently also pressed under high
pressure, are often surrounded with a flexible sheath which can
follow the shape of a shoe press on its circumferential face.
[0006] For this purpose, the sheath has to be guided and mounted at
its edge regions on the end sides of the roll, as a result of which
these regions are loaded heavily.
[0007] In order to solve this problem, compliant shaped bodies are
known which make mounting and force transmission possible on the
sheath circumferential face from and to an axially mounted rigid
carrier part of the roll.
[0008] They have the disadvantage that either the mounting and
adjustment are very complicated and therefore expensive.
Furthermore, it is disadvantageous that the known solutions absorb
too much heat from the rolling action which occurs as a result of
the shapes used and therefore have to be cooled in a complicated
manner, as otherwise the service life is reduced considerably.
[0009] DE-A 197 03 218 A1 has disclosed a pressing device for a
paper machine, in which a circulating roll sheath is mounted
rotatably on a rigid carrier via a radial support device at the
axial end regions. Here, the radial support device has a radially
elastic hollow torus body, on which the roll sheath rests. Here,
the torus body is connected fixedly to the rigid carrier via a
flange by means of a clamping system. The torus body is configured
separately from the roll sheath, and the roll sheath and torus body
have to be mounted individually on the rigid carrier in a
complicated mounting process and adjusted with respect to one
another.
[0010] DE-A 101 38 526 A1 has disclosed a flexible pressing sheath
with an embedded reinforcement and a shoe press roll with a
pressing sheath of this type, in which the pressing sheath has an
additional reinforcement at its end regions, via which the pressing
sheath can be fastened to the outer face of a rotatable support
element. This additional reinforcement has to be incorporated into
the pressing sheath in additional complicated manufacturing steps.
Furthermore, it is disadvantageous that the pressing sheath has to
be fastened to the outer face of the rotatable support element in
an additional mounting step, which makes accurate and complicated
adaptation and adjustment necessary. Compliance of the edge region
of the roll surface is not made possible, which has the consequence
of more pronounced wear and contamination.
[0011] DE 35 46 650 C2 has disclosed a press roll sheath which can
be clamped and fastened to the end side of the press roll by lugs
which are formed integrally at its axial ends. In this previously
known prior art, radial compliance is not possible at the axial
edge region of the circumferential face, which limits the
applicability of the proposed system, as only small pressing depths
into the press roll surface are possible.
[0012] All the abovementioned solutions have the disadvantage that
sealing problems occur at the transitions of circulating
circumferential face and the end sides of the rolls as a result of
the constructions which are used, which sealing problems can be
eliminated only to a limited extent with high expenditure.
SUMMARY OF THE INVENTION
[0013] The invention is based on the aim of making a sheath for a
pressing device and also a pressing device of this type possible,
which sheath is improved over the prior art and in which the
abovementioned disadvantages do not occur and, in particular, the
service life is increased with respect to the known shapes of
sheath.
[0014] The invention is directed to a sheath for a pressing device.
The sheath surrounds the pressing device at least partially, the
circumferential face of the sheath has substantially the shape of a
cylinder circumferential face, and the sheath is configured such
that it is resilient in a spring-elastic manner. The sheath is
mounted on an annular bearing at at least one axial end, the radius
of the annular bearing is smaller than the radius of the
circumferential face, and the sheath extends at the at least one
axial end via a bellows-shaped transition region to the annular
bearing. Additionally, the invention is directed to a pressing
device including the above-described sheath for a paper
machine.
[0015] According to the invention, there is provision for the
sheath to be mounted on an annular bearing at at least one axial
end, the radius of the annular bearing being smaller than the
radius of the circumferential face, the sheath extending at the at
least one axial end via a bellows-shaped transition region to the
annular bearing.
[0016] The invention proposes to make a deformation of the sheath,
for example when used in a shoe press, reversible in, above all,
the radial direction by the fact that the circumferential face of
the sheath is mounted in a reversibly deformable manner and as a
result of the bellows-shaped transition region on the annular
bearing. For this purpose, the bellows-shaped transition region is
configured with a flexibly deformable bulge which absorbs the
mechanical relative movement between the circumferential face of
the sheath and the annular bearing.
[0017] According to one preferred refinement of the invention,
there is provision for the bellows-shaped transition region to be
configured in one piece with the circumferential face.
[0018] One advantageous refinement of the invention provides for
the annular bearing to be formed by the support face of a circular
end disk which is mounted axially on the rotating pressing
device.
[0019] According to one advantageous variant of the invention,
there is provision for the transition region to merge into
individual tabs which are fastened individually to the annular
bearing.
[0020] A filler body is advantageously provided in the
bellows-shaped bulge of the transition region between this end of
the circumferential face which adjoins it and the annular
bearing.
[0021] The filler body is preferably formed by a torus which is
halved in the radial direction with regard to its center point.
[0022] One advantageous refinement of the invention provides for
the filler body to seal the inner region of a pressing device which
is enclosed by the sheath, in the region of the transition
region.
[0023] According to one particularly preferred refinement of the
invention, the filler body is formed by a pressurized tube.
[0024] According to one likewise very advantageous variant of the
invention, there is provision for the filler body to be formed by a
spring-elastic torus body of solid configuration.
[0025] Accordingly, the filler body can be of the open-pore
configuration, as a result of which a dissipation of heat is
ensured in it as a result of ventilation, which increases the
service life.
[0026] The pressing device is advantageously filled in the interior
with a filler medium at a preselected pressure.
[0027] A laid fabric layer is advantageously formed in the sheath,
which laid fabric layer extends over the circumferential face and
over the transition region to the annular bearing.
[0028] One variant of the invention provides for the laid fabric
layer which extends over the circumferential face to be formed in
the sheath. Accordingly, an additional laid fabric layer is
provided which overlaps with the laid fabric layer of the
circumferential face and extends over the transition region to the
annular bearing.
[0029] One advantageous development of the invention provides for
the additional laid fabric layer to be spliced onto the laid fabric
layer of the circumferential face in the overlapping region.
[0030] The circumferential face and the transition region are
advantageously manufactured from the same material.
[0031] The transition region is preferably cast onto or adhesively
bonded to the circumferential face.
[0032] The radial compliance of the transition region and the
circumferential face advantageously corresponds at most to 90% of
the difference in radius between the circumferential face and the
annular bearing.
[0033] Further advantages, special features and expedient
developments of the invention result from the further subclaims or
their sub-combinations.
BRIEF DESCRIPTION OF THE DRAWINGS
[0034] In the following text, the invention will be explained
further using the drawings, in which, in detail and in a
diagrammatic illustration:
[0035] FIG. 1 shows a diagrammatic view obliquely from above of a
pressing device 2 according to the invention having a sheath 1
according to the invention;
[0036] FIG. 2 shows a diagrammatic cross-sectional illustration in
the axial direction through the bellows-shaped transition region 3
at the edge of the circumferential face 11 of the sheath 1, which
edge forms the transition of the sheath 1 to the annular bearing
7;
[0037] FIG. 3 shows a cross-sectional illustration according to
FIG. 2 through the region which is shown there, the maximum
deflection in the direction of the rotational axis being shown;
[0038] FIG. 4 shows one refinement of the bellows-shaped transition
region 3, a laid fabric which reinforces with respect to tensile
forces being embedded in the sheath 1;
[0039] FIG. 5 shows a further refinement of the proposed laid
fabric, two different laid fabrics being spliced onto one another
in this example;
[0040] FIG. 6 shows a diagrammatic cross-sectional illustration
according to FIG. 2 through the region shown there, a filler body 5
being provided which is provided in the bulge which is formed by
the bellows-shaped transition region 3;
[0041] FIG. 7 shows a diagrammatic plan view of the sheath which is
used in FIG. 6 and has tab-like extensions for clamping and
fastening to the end disk 6;
[0042] FIG. 8 shows a cross-sectional illustration through a
further modification, in which a torus 51 is provided in the bulge
which is formed by the bellows-shaped transition region 3; and
[0043] FIG. 9 shows a view in the axial direction of the torus 51
from FIG. 8.
[0044] The designations in the figures denote identical or
identically acting elements.
DETAILED DESCRIPTION OF THE INVENTION
[0045] FIG. 1 shows a pressing device 2 according to the invention,
a shoe press roll of a paper machine, having a sheath 1 according
to the invention.
[0046] The sheath 1 merges at its axial ends 17 from the
circumferential face 11 with a bellows-shaped transition region 3
into the annular bearing 7 which is formed by a support on the
axially (A) mounted end disk 6 of the press roll 2.
[0047] FIG. 2 shows a cross-sectional illustration of the
bellows-shaped transition region 3 between the circumferential face
11 of the sheath 1 and the annular bearing 7.
[0048] The radius R2 of the annular bearing 7 is smaller than the
radius R1 of the circumferential face 11. As a result, a bulge 32
is formed in the profile of the bellows-shaped transition region
3.
[0049] At one end, the bellows-shaped transition region 3 is
integrally formed onto the circumferential face 11 of the sheath 1
and, at its other end, is clamped on the support face 71 in the
annular bearing 7 on the end disk 6.
[0050] As the inner region of the press roll which is shown is
filled with a gas under pressure, the sheath cannot spring back
again into its original shape after passing through the deforming
shoe press region (see FIG. 3 in this regard).
[0051] FIG. 3 shows the state of maximum deflection of the
circumferential face 11 of the sheath 1 in the direction of the
rotational axis A. The initial radius is compressed from R1 to R1a.
The bellows-shaped transition region 3 firstly keeps the inner
region 21 tight and secondly can transmit force transmission from
the rotational axis to the circulating sheath.
[0052] Here, the radial compliance of the transition region 3 and
the circumferential face 11 is at most 90% of the difference in
radius (R1-R2) between the circumferential face 11 and the annular
bearing 7.
[0053] FIG. 4 shows one refinement of the bellows-shaped transition
region 3, a reinforcing laid fabric 4 which suppresses tensile
forces and undesired deformations being incorporated into the
sheath 1 over the circumferential face 11 to the end of the
bellows-shaped transition region 3.
[0054] FIG. 5 shows one variant of the continuous laid fabric, a
first laid fabric layer 41 being incorporated into the sheath 1
along the circumferential face 11, and a second additional laid
fabric layer 43 which is selected for the bellows-shaped transition
region 3 being spliced onto the first laid fabric layer 41 in an
overlapping region 44.
[0055] FIG. 6 and FIG. 7 show a further refinement, the
bellows-shaped transition region 3 of the sheath 1 merging into
individual tabs 31 which are fastened individually to the annular
bearing 7. Furthermore, in the example shown, a spring-elastic
filler body 5 which is formed by a tube 52 is provided in the bulge
32 which is formed by the bellows-shaped transition region 3,
between the adjacent end 13 of the circumferential face 11 and the
annular bearing 7.
[0056] The filler body 5 (tube 52) seals the inner region 21 of the
pressing device 2 in a gastight manner between the sheath 1 and the
end disk 6 at the bellows-shaped transition region 3. The restoring
force of the circumferential face counter to the deformation at the
press shoe can therefore be set by gas pressure which can be
regulated in the interior.
[0057] FIG. 7 shows the sheath 1 having the tabs 31 from FIG. 6
which are formed integrally at the axial end 17, in the unwound
separate state.
[0058] In a modification of FIG. 6, FIG. 8 shows a filler body 5 in
the form of a torus 51 which is halved in the radial direction R
with regard to its center point.
[0059] FIG. 9 shows a view in the axial direction of the torus 51
from FIG. 8. The torus 51 is provided with slots 53. The spring
force of the spring-elastic torus 51 can be preselected by the
slots 53, in addition to the material selection of the torus
51.
[0060] Within the context of the invention, an above-described
sheath 1 or a pressing device 2 can be used at all locations of the
paper machine, at which rolls or guides are provided.
LIST OF DESIGNATIONS
[0061] 1 Sheath [0062] 11 Circumferential face of the sheath [0063]
13 Edge region of the circumferential face of the sheath [0064] 17
Axial end [0065] 2 Pressing device [0066] 21 Inner region [0067] 3
Bellows-shaped transition region [0068] 31 Tab [0069] 32 Bulge
[0070] 4 Laid fabric layer [0071] 41 Laid fabric layer [0072] 42
Additional laid fabric layer [0073] 44 Overlapping region [0074] 5
Filler body [0075] 51 Torus [0076] 52 Tube [0077] 53 Slot [0078] 6
End disk [0079] 7 Annular bearing [0080] S End side [0081] R Radial
direction [0082] R1 Radius [0083] R2 Radius [0084] A Axial
direction
* * * * *