U.S. patent application number 14/865417 was filed with the patent office on 2016-01-14 for roll.
This patent application is currently assigned to Voith Patent GmbH. The applicant listed for this patent is Voith Patent GmbH. Invention is credited to Hubert Bischof, Martin Breineder, Matthias Schmitt, Yang Shieh.
Application Number | 20160010284 14/865417 |
Document ID | / |
Family ID | 50343787 |
Filed Date | 2016-01-14 |
United States Patent
Application |
20160010284 |
Kind Code |
A1 |
Breineder; Martin ; et
al. |
January 14, 2016 |
ROLL
Abstract
A roll for use in a machine for at least one of producing,
processing and finishing a fibrous web such as a paper, cardboard
or tissue web; comprising a roll core, a roll cover arranged on the
roll core, roll caps which close off the roll at its end faces, and
at least one glass fiber with sensors for determining operating
parameters arranged in at least one of the roll cover and between
the roll cover and the roll core; whereby the at least one glass
fiber is connected to an evaluation device outside the roll; and
wherein the at least one glass fiber is arranged in a reversibly
closable bore in the roll core and in a recess in the roll cap
aligned with the reversibly closable bore.
Inventors: |
Breineder; Martin;
(Natschbach, AT) ; Bischof; Hubert; (Murzzuschlag,
AT) ; Schmitt; Matthias; (Munchen, DE) ;
Shieh; Yang; (Wallingford, PA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Voith Patent GmbH |
Heidenheim |
|
DE |
|
|
Assignee: |
Voith Patent GmbH
Heidenheim
DE
|
Family ID: |
50343787 |
Appl. No.: |
14/865417 |
Filed: |
September 25, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/EP2014/055791 |
Mar 24, 2014 |
|
|
|
14865417 |
|
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|
|
Current U.S.
Class: |
162/231 |
Current CPC
Class: |
D21F 3/08 20130101; D21H
13/40 20130101; D21F 1/40 20130101; D21H 27/005 20130101; D21G 1/02
20130101; D21F 3/10 20130101 |
International
Class: |
D21H 27/00 20060101
D21H027/00; D21H 13/40 20060101 D21H013/40 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 27, 2013 |
DE |
10 2013 205 450.5 |
Claims
1. A roll for use in a machine for at least one of producing,
processing and finishing a fibrous web, said roll comprising: a
roll core; a roll cover arranged on the roll core; roll caps which
close off the roll at its end faces; and at least one glass fiber
with sensors for determining operating parameters arranged in at
least one of the roll cover and between the roll cover and the roll
core, whereby the at least one glass fiber is connected to an
evaluation device outside the roll, wherein the at least one glass
fiber is arranged in a reversibly closable bore in the roll core,
and in a recess in the roll cap aligned with the reversibly
closable bore.
2. The roll according to claim 1, wherein the reversibly closable
bore and the recess are dimensioned such that a fiber plug that is
arranged terminally on the at least one glass fiber can be inserted
into the reversibly closed bore and the recess.
3. The roll according to claim 2, wherein an extension cable can be
connected to the fiber plug.
4. The roll according to claim 1, wherein a bore hole is
incorporated in the roll cover, whereby the at least one glass
fiber is arranged leading out of the roll cover, extending in the
roll core and feeding into the reversibly closable bore.
5. The roll according to claim 2, wherein a sleeve is arranged in
the reversibly closable bore in which the fiber plug is fastened,
preferably by being screwed in.
6. The roll according to claim 1, wherein at least one of the
reversibly closable bore and the recess are provided, at least in
sections, with a thread.
7. The roll according to claim 1, wherein the recess is sealed
gas-tight by a screw during a tempering process of the roll.
8. The roll according to claim 7, wherein after completion of the
tempering process, the screw is replaceable by a banjo bolt through
which the at least one glass fiber can be led out of the roll.
9. The roll according to claim 1, wherein the roll cover consists
at least partially of rubber or polyurethane or combinations
thereof, or with fiber composite materials.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation of PCT application No.
PCT/EP2014/055791, entitled "ROLL", filed Mar. 24, 2014, which is
incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a roll for a machine for producing,
processing and/or finishing a fibrous web such as a paper,
cardboard or tissue web.
[0004] 2. Description of the Related Art
[0005] Rolls are provided in many locations in machines for the
production of paper and other web materials. They serve various
purposes, for example dewatering, smoothing, rerouting and guiding
of the fibrous web. In many locations the rolls are equipped with a
sensor system in order to determine operating parameters of the
machine and to input automatic control into the process control
system.
[0006] Such sensor systems are generally in the form of sensors
that are embedded in a roll cover or in the region of same. The
sensors may for example be glass fibers which are inscribed with
Bragg grating that are reflective for light coupled into the glass
fiber. Processing of the measured data recorded by the sensors
occurs in an evaluation device that is connected with the sensors.
The evaluation device is arranged on an end cap of the roll and
rotates with same. Alternatively it can be located separately from
the roll.
[0007] A system for the determination of the pressure profile in a
roll nip is known from EP 0809570 B1, including a first roll which
is designed so that it forms a roll nip together with at least one
additional roll, whereby the first roll includes several sensors at
circumferential and axial locations around the roll in order to
capture the pressurization upon the first roll when the first roll
is pressed, rotating against the at least one additional roll. The
sensors supply pressure signals which are representative of the
pressure that is captured by each sensor. Moreover a computer is
provided with a micro-processor in order to calculate values from
the pressure signals of the pressure captured by at least one of
the sensors, and a display that is connected with the computer in
order to provide a visual illustration of the pressure
measurements. The at least one sensor is a fiber optic sensor
including one optical fiber that is arranged along the length of
the first roll and parallel to the axis of the roll.
[0008] In order to couple the light and again channel it out, it is
necessary in each case to arrange the glass fiber such that it is
led out of the roll cover without it being damaged or even cut
during manufacture or rework of same.
[0009] Rubber or polyurethane roll covers which are suitable for
application with such sensors are normally produced oversized so
that the roll cover protrudes beyond a roll core and can then be
trimmed to the desired measurement. With this approach, a glass
fiber that is arranged in the cover or on the boundary interface
between the cover and the core would be cut.
[0010] The current state of the art does not provide any
information hereto, since normally only the electrical contacting
is described, whereas the connection of the fiber to the outside is
not described in detail.
SUMMARY OF THE INVENTION
[0011] It is the objective of the current invention to provide
measures that protect the glass fiber during production of the roll
cover from damage or severing, and to arrange said glass fiber such
that access for connection of external equipment is still
ensured.
[0012] The invention provides that at least one glass fiber is
arranged in a reversibly closable bore in the roll casing and in
the recess aligned therewith in the roll cap. This ensures simple,
non-destructive--even multiple--assembly and disassembly, which
also offers protection from environmental influences such as heat
and moisture which could damage the glass fiber.
[0013] Provision should preferably be made that the bore and the
recess are dimensioned such that a fiber plug that is arranged
terminally on the glass fiber can be inserted into the bore and the
recess. In spite of this, the dimensioning is then still small
enough as not to affect the stability of the involved roll
components.
[0014] An extension cable can then easily be connected to the fiber
plug.
[0015] A bore hole can preferably be incorporated in the roll
cover, wherein at least one of the glass fibers is arranged,
leading out of the roll cover, extending in the roll casing and
feeding into the bore. In this location the glass fiber is
protected and positioned without significant curvature.
[0016] In an additional embodiment, it may be provided that a
sleeve is arranged in the bore in which the fiber plug is fastened,
preferably screwed in.
[0017] In another embodiment, the bore and/or the recess can be
provided, at least in sections with a thread.
[0018] It is to be emphasized that it is especially advantageous
that the recess can be sealed gas-tight by a screw during a
tempering process of the roll. The glass fiber and the fiber plug
are thus optimally protected during the heat and water
vapor-involving curing process from the effects of said
influences.
[0019] After completion of the tempering process the screw can
advantageously be replaced by a banjo bolt through which the at
least one glass fiber can be led out of the roll. This renders the
assembly and disassembly very simple and damage-proof.
[0020] According to preferred aspects of the invention, the roll
cover can consist at least partially of rubber or polyurethane or a
combination thereof, or with a fiber composite material.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above-mentioned and other features and advantages of
this invention, and the manner of attaining them, will become more
apparent and the invention will be better understood by reference
to the following description of embodiments of the invention taken
in conjunction with the accompanying drawings, wherein:
[0022] FIG. 1 illustrates a schematized view of the end of a roll
according to the invention with one glass fiber and one passage for
same, before a tempering process; and
[0023] FIG. 2 illustrates a schematized view as shown in FIG. 1, in
a sectional view of the region of the passage after the tempering
process.
[0024] Corresponding reference characters indicate corresponding
parts throughout the several views. The exemplifications set out
herein illustrate embodiments of the invention and such
exemplifications are not to be construed as limiting the scope of
the invention in any manner.
DETAILED DESCRIPTION OF THE INVENTION
[0025] FIG. 1 is a simplified illustration of a roll 1 for use in a
machine for the production, processing and/or finishing of a
fibrous web; for example a paper, cardboard or tissue web. Roll 1
includes a roll core 2 which can consist of metal or a composite
material and a roll cover 3 arranged thereupon which consists of an
elastic material such as rubber or polyurethane.
[0026] Roll cover 3 is normally attached to roll core 2 by way of
an adhesion promoting layer or a base layer.
[0027] In known sensor systems for the determination of operating
parameters in a machine for the production of a fibrous web, glass
fibers 4 can be embedded into roll cover 3 or at a boundary
interface between roll core 2 and roll cover 3.
[0028] When embedding glass fibers 4 into roll cover 3, glass fiber
4 must be directed laterally through roll core 2 to a roll end face
5 in order to prevent glass fiber 4 being severed and thus
destroyed when trimming roll cover 3.
[0029] A bore at an approximate angle of 45.degree. is implemented
through roll cover 3 and roll core 2 into which then a protective
hose is inserted that is cut off flush at its exit point from the
cover, which however protrudes up to 2 m at roll end face 5. Glass
fiber 4 is threaded into this hose (starting with the fiber end)
and pulled through until a terminal fiber plug reaches the end of
the protective hose at roll end face 5. Depending on the selected
design, glass fiber 4 is then for example wound onto roll cover 3
and fastened before an additional cover layer is applied over
it.
[0030] A disadvantage with this system is in particular that a roll
cap 6 can no longer be removed after insertion of glass fiber 4
without destroying said glass fiber during the process. This would
necessitate a completely new cover on roll 1 if the sensor
technology is still to be used. This is particularly problematic
for suction rolls and zone-controlled rolls since roll caps 6 must
be opened more frequently with these type of rolls.
[0031] The current state of the art cannot offer any suggestions
for a remedy of the problem, since always only the electrical
contacting of the sensors is described. An electrical contacting is
possible and has been established for a long time through simple
multiple opening and closing, for example via plug-in contacts. The
reliable contacting and respectively leading glass fiber 4 out of
roll 1 is in contrast a challenge that is not to be underestimated,
since the contacting is only possible one time when inserting glass
fiber 4 into roll 1. Multiple connecting and disconnecting is not
possible, so that breaking of glass fiber 4 automatically results
in a complete loss of roll cover 3 including glass fiber 4. Based
on the cost for a new cover with embedding of a measuring system,
this is to be avoided at all cost. A simple and reliable solution
for this problem is offered below.
[0032] Moreover, in addition to the general leading out and
contacting of glass fiber 4, the use of in particular rubber roll
cover 3 is problematic: vulcanization of rubber uses water vapor
for energy transfer, representing a critical factor that attacks
glass fiber 4 and leads to brittleness. This can also destroy glass
fiber 4. Since vulcanization with water vapor is a proven method in
the production of rubber covers it, is meaningful not to change the
process, but instead to develop a protection system for glass fiber
4.
[0033] In order to protect glass fiber 4 against water vapor a
gas-tight system must be realized. According to the invention, this
is combined with a mechanical system that allows roll cap 6 to be
opened without destroying glass fiber 4.
[0034] With reference to FIG. 2 and continued reference to FIG. 1,
for this purpose a bore 7 is introduced in roll core 2 at the
transition to roll cap 6 and parallel to roll cover 3 that is large
enough to accommodate a fiber plug 8 and to be able to connect same
manually to an extension cable 9. The diameter of bore 7 is
approximately 13 to 19 mm. The transfer of glass fiber 4 from roll
cover 3 occurs through a bore hole 10 that progresses in a diameter
of approximately 5 mm diagonally out of roll cover 3 into roll core
2 and ends in bore 7 while avoiding strong curvature.
[0035] Glass fiber 4 is protected in borehole 10 either by a
retractable protective hose that has the same dimensions as bore
hole 10, or by a sheathing of glass fiber 4. In bore 7 in roll core
2 a sleeve 11 is arranged, preferable screwed in, into which fiber
plug 8 is screwed at the exit from bore hole 10. Glass fiber 4 is
inserted into bore hole 10 with some clearance in order to
compensate for possible expansions during the tempering
process.
[0036] The assembly occurs while roll cap 6 is removed from roll
core 2. For tempering of roll cover 3, roll cap 6 is reattached. In
the location where bore 7 has been applied in roll core 2 it has a
recess 12 that is consistent with the dimensions of bore 7 in roll
core 2. Recess 12 in roll cap 6 as well as the first millimeters of
bore 7 in roll core 2 are equipped with a thread 13, so that a
screw 14 can be screwed in from the outside whose threads can be
provided additionally with a sealing adhesive in order to be able
to seal bore 7 gas-tight. In addition a sealing ring that is not
illustrated may be provided between roll cap 6 and roll core 2.
Roll 1 thus becomes gas-tight in this region and glass fiber 4 is
protected from the effects of water vapor.
[0037] After tempering, screw 14 is replaced by a banjo bolt 15 as
illustrated in FIG. 2. Extension cable 9 that is designed as a
sheathed glass fiber 4 is guided through the banjo bolt and
connected to the permanently mounted fiber plug 8 in roll core 2.
For this purpose extension cable 9 is first threaded through banjo
bolt 15 and connected on sleeve 11 in roll core 2, before banjo
bolt 15 is screwed into roll cap 6. The hole in banjo bolt 15 is
closed by a sealing material, such as silicone, however in a way
that the fiber still has some clearance. The end of extension cable
9 that is not illustrated in further detail can now be connected to
an evaluation device that is also not illustrated in further detail
and that is mounted for example on the roll end face 5 on roll cap
6. Extension cable 9 is attached for this purpose on roll end face
5, inserted into the evaluation device and is also attached there.
Sheathed glass fiber 4 always has some clearance to allow
disassembly.
[0038] For disassembly of roll cap 6 the attachments of sheathed
glass fiber 4 are now simply loosened, the sealing material in
banjo bolt 15 removed if necessary, banjo bolt 15 screwed out and
extension cable 9 disconnected from fiber plug 8 in roll core 2.
Roll cap 6 can now be easily removed without destroying glass fiber
4.
[0039] While this invention has been described with respect to at
least one embodiment, the present invention can be further modified
within the spirit and scope of this disclosure. This application is
therefore intended to cover any variations, uses, or adaptations of
the invention using its general principles. Further, this
application is intended to cover such departures from the present
disclosure as come within known or customary practice in the art to
which this invention pertains and which fall within the limits of
the appended claims.
* * * * *