Nothing Special   »   [go: up one dir, main page]

EP2678652A1 - Cylindre pour machines à papier, avec capteurs à fibres de bragg - Google Patents

Cylindre pour machines à papier, avec capteurs à fibres de bragg

Info

Publication number
EP2678652A1
EP2678652A1 EP12706227.1A EP12706227A EP2678652A1 EP 2678652 A1 EP2678652 A1 EP 2678652A1 EP 12706227 A EP12706227 A EP 12706227A EP 2678652 A1 EP2678652 A1 EP 2678652A1
Authority
EP
European Patent Office
Prior art keywords
roller
optical waveguide
fiber bragg
bragg grating
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12706227.1A
Other languages
German (de)
English (en)
Inventor
Antje Berendes
Martin Breineder
Matthias Schmitt
Yang SHIEH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE201210202245 external-priority patent/DE102012202245A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2678652A1 publication Critical patent/EP2678652A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/06—Means for regulating the pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/004—Regulating the pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
    • G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0061—Force sensors associated with industrial machines or actuators
    • G01L5/0076—Force sensors associated with manufacturing machines
    • G01L5/0085—Force sensors adapted for insertion between cooperating machine elements, e.g. for measuring the nip force between rollers

Definitions

  • the invention relates to rolls for machines for industrial papermaking, which have fiber Bragg sensors for detecting a pressure acting on the roller.
  • a suspension is applied to a carrier, such as a carrier.
  • B. applied and dewatered.
  • Dewatering is continued following formation in subsequent sections of the paper machine until finally a self-supporting nonwoven web is produced.
  • the non-self-supporting nonwoven web is usually transferred to other carriers, such as felts or other sieves.
  • the nonwoven web is guided by the support supporting it through a series of nips.
  • nip refers to the region between two cooperating rolls or between a roll and the so-called shoes pressing against them, in which the nonwoven fabric is pressed or pressurized.
  • the pressure profile which forms in the nips when passing through the nonwoven web has a significant influence on the efficiency with which the nonwoven web is dewatered and smoothed. With uneven pressure distribution in the nip, the nonwoven web has an uneven moisture profile or only poor smoothing. Paper manufacturers are therefore anxious to monitor the pressure profiles in the nip areas.
  • the rolls used usually have a roll core which receives the load on.
  • the surfaces of the rolls which come into contact with it must have different properties. Therefore, the rollers in the region of the peripheral surface of the roller, which comes into contact with the nonwoven fabric, are usually provided with a so-called roll cover having the respective desired properties.
  • the roll cover can be constructed in multiple layers. The directly on the roll core adjacent and the connection between the roll core and roll cover producing layer is often referred to as a "base layer".
  • Sensors can be used to monitor the pressure profile in the nip during operation.
  • the sensors are arranged on the outer circumferential surface of the roll core or within the roll cover. Radial forces acting on the roll geometry are typically detected using piezoelectric or electromechanical sensors. Both types of sensors generate an electrical signal that is representative of their deformation under the respective pressure conditions. Since the rotational speed of the rolls is very high in modern paper machines, the sensor signal values are preferably transmitted by radio to external processing devices.
  • sensors and fiber optic sensors can be used in which the optical properties of an optical waveguide (such as a glass fiber) are changed by the transmitted to the optical waveguide deformation stress.
  • Fiber optic sensors for use in roll covers for paper machines which use fiber Bragg gratings inscribed in glass fibers as sensor elements.
  • Fiber Bragg gratings are arranged in optical waveguide optical interference filter, which are written for example by means of a laser in the optical waveguide. Wavelengths that lie within the given filter bandwidth by ⁇ ⁇ are reflected.
  • the present invention relates to a roller for use in paper machines, which allows a determination of a pressure acting on the roller and its course with respect to the roller geometry (for example, in a nip) in a reliable manner and yet inexpensive to produce in a simple manner. Furthermore, the present invention relates to a method for producing a corresponding roller.
  • a roll for use in papermaking machines comprising a roll core, a roll cover surrounding the roll core, and at least one optical waveguide having a plurality of fiber Bragg gratings.
  • the roll core can for example be made of metal (in particular steel) or plastic (in particular carbon fiber reinforced plastic CFK or a fiber-plastic composite FKV) and be solid or hollow.
  • the roll core can be made either in one piece or in several pieces.
  • the roll cover may for example comprise plastic or be formed therefrom.
  • the at least one optical waveguide can be arranged either between the roll core and roll cover or embedded in the roll cover.
  • the at least one optical waveguide is embedded in the roll cover, it can optionally be embedded in a layer of the roll cover or arranged between two layers of the roll cover.
  • the layer often referred to as the "base layer”, which immediately adjoins the roll core and establishes the connection between roll core and roll cover is understood as a layer of the roll cover, even if it is formed from the same material as the roll core.
  • portions of the at least one optical waveguide, each containing a fiber Bragg grating hereinafter fiber Bragg grating sections
  • fiber Bragg lattice-free sections portions of the at least one optical waveguide which are free of a fiber Bragg grating
  • Fiber Bragg grating sections enclose with a circumferential direction to the roller at an angle of less than 80 ° and in particular less than 60 ° and more particularly less than 45 °.
  • the at least one optical waveguide in the fiber Bragg grating sections is connected non-positively to the adjacent roller core and / or roller cover. The fiber Bragg grating sections and the adjacent roller core and / or roller cover then directly adjoin and contact each other.
  • fiber Bragg grating sections of the Optical waveguide performs a radial compressive load on the roller to a tensile load of the optical waveguide in this section.
  • the cause is considered to be caused by the pressure load temporary and reversible displacement of the roll cover in the circumferential direction.
  • the wavelength range of the radiation reflected by the fiber Bragg grating shifts. The reason is a shift in the distance between refractive index transitions in the optical waveguide. This shift of the wavelength range thus allows conclusions about the pressure load of the roller.
  • Fiber Bragg grating sections with a circumferential direction to the roller enclose an angle greater than 80 °, as long as more than 50% of the sections and in particular more than 70% of the sections and more particularly more than 90% of the sections one Include angle of less than 80 ° and in particular less than 60 ° and more particularly less than 45 °.
  • Fiber Bragg grating sections which enclose an angle of greater than 80 ° with the circumferential direction to the roller enclose an angle of less than 10 ° with the axial direction of the roller and thus extend almost parallel to the axial direction.
  • Such oriented fiber Bragg grating sections are subject to a low (or even in the case of an axial orientation) tensile load under pressure of the roller, so that a determination of the pressure is difficult or impossible.
  • Between the fiber Bragg grating sections lying fiber Bragg grating-free sections can be arbitrary.
  • the optical waveguide can be arranged wave-like or meandering.
  • a roller for use in paper machines comprising a roller core and a roller cover surrounding the roller core, and at least one optical fiber having a plurality of fiber Bragg gratings, the at least one optical fiber extending therebetween between the roller core and the roller cover arranged or embedded in the roll cover longitudinal extent extends on a concentric with the axis of rotation of the roller cylindrical surface.
  • the optical waveguide extends on a concentric with the axis of rotation of the roller cylindrical surface, which is formed either by the interface between the roll core and roll cover or is disposed within the roll cover.
  • fiber Bragg grating sections of the at least one optical waveguide alternate with fiber Bragg grating-free sections of the at least one optical waveguide in the longitudinal direction of the optical waveguide.
  • at least some of the roll core and roll cover or embedded in the roll cover fiber Bragg grid-free sections on the cylindrical surface are curved.
  • the fiber Bragg grating sections can be oriented almost arbitrarily, in particular it is possible in this case to orient the fiber Bragg grating sections, that these include with the circumferential direction to the roller an angle of less than 80 ° and in particular less than 60 ° and more particularly less than 45 °.
  • the distances between the fiber Bragg gratings can be varied over a wide range by the curved course of the fiber Bragg gratings-free sections and thus according to the requirements of the roller, for example.
  • the distance Fiber Bragg grating in the roller and thus the distance between the sensors varies with each other and thus the local resolution can be adjusted.
  • different fiber Bragg grating-free sections of the at least one optical waveguide have a length that is different by a maximum of 30%, preferably a maximum of 10%. It is particularly preferred if the plurality of fiber Bragg grating-free sections of the at least one optical waveguide have the same length.
  • the optical waveguide for almost any roller-regardless of the length and the circumference of the roller- be assembled and the distance between the fiber Bragg gratings in the roll cover from each other, adjusted by the curved course of the fiber Bragg grating-free sections become.
  • a particularly preferred embodiment of the invention which can also be regarded as an independent aspect of the invention, therefore provides that the at least one optical waveguide is curved at least in sections along its longitudinal extent embedded between the roll core and the roll cover or embedded in the roll cover, and the radius of curvature of the curved course of the optical waveguide 2cm or larger, preferably 3cm or larger, more preferably 5cm or larger.
  • At least some, in particular all embedded between roll clamps and roll cover or embedded in the roll cover fiber Bragg grating-free sections of the at least one optical waveguide are each curved in only one direction.
  • this can mean, for example, that one of the two Bragg grating-free sections has a positive curvature and the other of the two Bragg lattice-free sections has a negative curvature or vice versa.
  • successive fiber Bragg grating-free sections of the at least one optical waveguide between which a fiber Bragg grating section of the at least one optical waveguide is arranged are therefore curved in mutually different directions.
  • the at least one optical waveguide can preferably be embedded at least along its length in the roll cover or between the roll core and roll cover, have a core and a sheath surrounding the core or be formed therefrom.
  • the sheath in the region of the fiber Bragg grating sections is preferably either directly with the roller core and the roll cover or directly in contact with the roll cover.
  • the fiber Bragg grating portions of the optical waveguide are directly applied with the force acting on the roll cover without an intermediate element -here referred to as a "stud element.”
  • an intermediate element -here referred to as a "stud element.”
  • the roll is subject to a maximum tensile load between the roll core and roll cover or fiber Bragg grating sections arranged in the roll cover In this case, the fiber Bragg grating sections have the greatest signal sensitivity.
  • the signal sensitivity decreases with decreasing angle which the fiber Bragg gratings have Sections of the optical fiber with the circumferential direction of the roller becomes larger and, as already stated above, when aligned parallel to the axial direction of the roller is zero.
  • a preferred embodiment of the invention provides that the fiber Bragg grating sections with a circumferential direction to the roller at an angle of less than 30 ° and in particular less than 20 ° and further include less than 10 °.
  • the fiber Bragg grating sections include an angle of greater than 10 ° and in particular greater than 20 ° and more particularly greater than 30 ° with a circumferential direction to the roller.
  • fiber Bragg grating sections are arranged adjacent to the roller in the axial direction.
  • fiber Bragg grating sections can be arranged in an area extending in the axial direction over the entire length of the roller, the extent of which in the circumferential direction is less than 15 cm and in particular less than 5 cm and more particularly less than 1 cm. This allows a determination of the pressure curve in the axial direction of the roller at a certain angle of rotation of the roller.
  • fiber Bragg grating sections are spaced a constant distance in the axial direction of the roller. This allows a uniform determination of the pressure curve in the axial direction of the roller. This constant distance can be measured, for example, from the center of the respective fiber Bragg grating.
  • fiber Bragg grating sections are spaced in the axial direction of the roller in a first region by a first distance and in at least a second region by a second distance, wherein in particular the second distance by at least 30% and in particular by at least 60%, and more particularly at least 90% greater than the first distance.
  • This constant distance can be measured, for example, from the center of the respective fiber Bragg grating.
  • Such an arrangement allows a determination of the pressure curve in the axial direction of the roller, in which the density of the fiber Bragg gratings and thus the obtained pressure measurements in areas of interest in the axial direction of the roller (for example in the vicinity of the roller bearings) greater than in other areas in the axial direction of the roller (for example in the roller center).
  • the second distances in the second regions may be the same (and in particular the same in pairs) or different. A constant change of the distances is possible.
  • the roller has more than one optical waveguide, and adjacent fiber Bragg grating sections of different optical waveguides are arranged in a circumferentially extending over the entire circumference of the roller and thus a total annular area whose extent in the axial direction of the roller less than 10 cm and in particular less than 3 cm and more particularly less than 1 cm.
  • the above condition need not be met by all adjacent sections of different optical fibers. Rather, it is sufficient if this condition is met in pairs by individual fiber Bragg grating sections of different optical fibers.
  • the (immediately) adjacent fiber Bragg gratings of different optical waveguides in this embodiment are arranged along strips which surround the roller in the circumferential direction in a circular manner. This allows a determination of the pressure load at different angles of rotation of the roller.
  • adjacent fiber Bragg grating sections of different optical waveguides which are arranged in the region whose extent in the axial direction of the roller is less than 10 cm and in particular less than 3 cm and more particularly less than 1 cm, in the circumferential direction of the roller 45 ° or more, in particular 90 ° or more offset from one another.
  • fiber Bragg grating sections are arranged adjacent in the circumferential direction of the roller.
  • fiber Bragg grating sections can be arranged in a region extending in the circumferential direction over the entire circumference of the roll, the extent of which in the axial direction of the roll is less than 15 cm and in particular less than 5 cm and more particularly less than 1 cm. This allows a determination of the pressure load of the roller at different angles of rotation of the roller.
  • the roller has more than one optical waveguide, and adjacent fiber Bragg grating sections of different optical waveguides are arranged in an area extending in the axial direction over the entire length of the roller, whose extent in the circumferential direction of the roller is less than 15 cm and in particular less than 5 cm and more particularly less than 1 cm. This allows a determination of the compressive load in the axial direction of the roller at different angles of rotation of the roller.
  • the longitudinal direction of the optical waveguide spaced fiber Bragg gratings of the same optical fiber configured to reflect light of different wavelengths.
  • This allows an assignment of a measurement signal to the respective fiber Bragg grating of the same optical waveguide when the fiber Bragg gratings of the same optical waveguide are simultaneously loaded with tension.
  • a spatial resolution is possible even if the fiber Bragg gratings of the same optical waveguide are arranged in the axial direction of the roller in a narrow, simultaneously subjected to a pressure load area.
  • in the longitudinal direction of the optical waveguide spaced fiber Bragg gratings of the same optical waveguide are formed to reflect light of the same wavelength.
  • Such optical waveguides are particularly easy to manufacture.
  • a spatial resolution is only possible if the fiber Bragg gratings of the same optical waveguide are arranged offset in the circumferential direction of the roller to each other, and thus subject at different times of a pressure load.
  • fiber Bragg grating sections are arranged along a helical curve described on the surface of the roller, wherein a deviation from the helical curve both in the axial direction of the roller and in the circumferential direction of the roller is less than 15 cm and in particular less than 5 cm and more particularly less than 1 cm. This allows a pressure measurement in different axial areas of the roller at different angles of rotation of the roller.
  • one end of the at least one optical waveguide is led out of the roll cover.
  • both ends of the at least one optical waveguide are led out of the roll cover.
  • a light source and a light detector are arranged in the roller, which are connected to the at least one optical waveguide and configured to perform measurements with respect to the fiber Bragg gratings of the at least one optical waveguide.
  • the light detector may be connected to a transmitter to deliver acquired measurement data via an air interface to the outside of the roller.
  • a coil may be arranged in which from outside the roll by induction Current flow can be stimulated to supply the components contained in the roller with energy.
  • the roll cover has a plurality of layers, and the at least one optical waveguide is arranged between two layers of the roll cover.
  • the roll cover has a plurality of layers, and the at least one optical waveguide is embedded in and surrounded by one of the plurality of layers. This allows a simple and secure attachment of the at least one optical waveguide. Furthermore, the optical waveguide is thus well protected against damage.
  • the at least one optical waveguide is embedded in epoxy resin.
  • Epoxy resin allows a good switching of acting on the roller pressure forces on the at least one optical waveguide.
  • roller at an angle of less than 45 ° and in particular less than 20 ° and more particularly less than 10 ° and
  • a step of attaching a mark to the roller core or roller cover layer is made, which mark identifies the points or areas where a pressure measurement is to be made.
  • This marking can also take place, for example, in the form of a groove into which the optical waveguide is to be inserted. This makes it possible to increase the accuracy of the arrangement of the fiber Bragg grating sections.
  • a step of fixing the fiber Bragg grating-free sections to the roll core or the roll cover layer takes place prior to the step of applying at least one reference layer. In this way, it is ensured that the at least one optical waveguide bears against the entire surface of the roll core or the roll cover layer. If a releasable attachment for fixing the fiber Bragg grating sections to the roll core or roll cover layer is used, additionally detaching this releasable attachment and replacement by permanent attachment may be provided.
  • Figure 1 shows schematically a perspective view of a roller according to a first embodiment in which a part of the cover is removed and exposed optical fibers with fiber Bragg gratings;
  • FIG. 1 a shows a schematic enlarged view of the roll cover of the illustration of FIG. 1;
  • FIG. 2 schematically shows a perspective view of a roller according to a second embodiment, wherein a part of the cover is removed and optical fibers are exposed with fiber Bragg gratings;
  • FIG. 3 shows schematically a perspective view of a roller according to a third embodiment, in which a part of the cover is removed and optical fibers are exposed with fiber Bragg gratings;
  • Figure 4 shows schematically a perspective view of a roller according to a fourth embodiment, in which a part of the cover is removed and exposed optical fibers with fiber Bragg gratings;
  • Figure 5 schematically shows a perspective view of a roller according to a fifth embodiment, in which a part of the cover is removed and exposed optical fibers with fiber Bragg gratings.
  • FIG. 1 schematically shows a perspective view of a roll 1 according to a first embodiment.
  • the roller 1 has an axis of rotation 44 providing roll core 1 1 and a roll cover 12 surrounding this.
  • the roller core 1 1 made of steel and the roller cover 12 made of plastic.
  • between the roll cover 12 and the roll core 1 1 a known to those skilled in the "base layer" connecting layer is provided, which is not shown in the figure specifically.
  • a Section Schlierent the roll cover 12 is exposed in the figure 1 and gives the view of an optical waveguide 21 with multiple fiber Bragg gratings 22 free.
  • the individual fiber Bragg gratings 22 of the optical waveguide 21 are designed to reflect light of different wavelengths.
  • the optical waveguide 21 has fiber Bragg grating sections 22 as well as fiber Bragg gratings-free sections 43 ' , 43 " , wherein the fiber Bragg gratings Sections 22 and the fiber Bragg grating-free sections 43 ', 43 " in the longitudinal direction of the optical waveguide 21 alternate.
  • the optical waveguide 21 is arranged meander-shaped in the roll cover 1 1, and extends in the axial direction of the roller over the entire width of the roll cover 12 sections of the optical waveguide 21, each containing a fiber Bragg grating 22 (hereinafter fiber Bragg grating Sections 22) are arranged so that these sections each enclose an angle of approximately 0 ° with a circumferential direction to the roller 1.
  • fiber Bragg grating Sections 22 hereinafter fiber Bragg grating Sections 22
  • approximately 0 ° means that deviations from 0 ° can be tolerated by a maximum of 15 ° and preferably a maximum of 10 °.
  • the fiber Bragg grating sections 22 arranged adjacent in the axial direction may have a maximum offset of 1 cm in the circumferential direction.
  • the distance between the fiber Bragg grating sections 22 adjacent in the axial direction of the roller is chosen to be constant.
  • a pressure load on the roller cover 12 leads to a (slight) elongation of the optical waveguide 21 with the fiber Bragg gratings and thus to a change in the wavelength of the fiber Bragg grating. Lattices reflected light. In this way, it is possible to measure a pressure load on the roller along a line extending in the axial direction of the roller 1 line.
  • FIG. 1 a shows a schematic enlarged view of the roll cover 12 of the illustration of FIG. 1.
  • the roll cover 12 has an inner cylindrical circumferential surface 12i in the radial direction of the roll 1 and a cylindrical outer surface 12a which is outer in the radial direction of the roll 1, the latter providing the upper side of the roll cover which can be brought into contact with a material web or covering.
  • the two cylindrical lateral surfaces 12i and 12a are arranged concentrically to the axis of rotation 44.
  • the roller cover 12 there is a cylindrical surface 12k concentric with the axis of rotation 44, on which the at least one optical waveguide 21 is arranged and on which the fiber Bragg grating-free sections 43 ' , 43 "of the optical waveguide 21 extend in a curved manner
  • 12k may be formed by the radially outer surface area of a radially inner roll reference layer 12 ' on which the optical waveguide 21 is arranged and which in turn is covered by a radially outer roll reference layer 12 " , so that as a result the at least one optical waveguide 21 enters the Roll cover 12 is embedded.
  • each fiber Bragg grating-free section 43 ' , 43 " is curved in only a single direction of curvature and that successive fiber Bragg grating-free sections 43 ' , 43 " , between which a fiber Bragg grid portion 22 is arranged, are curved in mutually different directions of curvature.
  • the section 43 ' is curved in the opposite direction as the section 43 " .
  • FIG. 2 shows a second embodiment of a roll 1 'in a schematic perspective view. Since this embodiment is very similar to the first embodiment described above, only differences will be discussed and otherwise referred to the first embodiment.
  • the second embodiment shown in FIG. 2 differs from the first embodiment described above in particular in that a second optical waveguide 21 'with fiber Bragg grating sections 22' is provided, which extends in the circumferential direction to the first optical waveguide 21 with the fiber optic cable. Bragg grating sections 22 is arranged offset. This second optical waveguide 21 'is accessible from outside via a connection 23'.
  • the second ends of the optical waveguides 21, 21 ' are not led to the outside.
  • the fiber Bragg grating sections 22 'of the second optical waveguide 21' are arranged in the circumferential direction of the roller offset below the fiber Bragg grating sections 22 of the first optical waveguide 21, that arranged in the circumferential direction of the calf circumference adjacent arranged fiber Bragg gratings -Abperforminge 22, 22 'in the axial direction of the roller 1' are offset by less than 3 cm.
  • adjacent fiber Bragg grating sections 22, 22 ' lie on a narrow ring surrounding the roller in the circumferential direction.
  • the fiber Bragg grating sections 22, 22 'of each optical waveguide 21, 21' are as described in the first embodiment arranged.
  • Such an arrangement of the optical waveguides 21, 21 'and fiber Bragg grating sections 22, 22' allows measuring a pressure distribution in the axial direction of the roller at different angles of rotation of the roller.
  • FIG. 3 A perspective view of a roller 1 "according to a third embodiment is shown schematically in Figure 3. Since this embodiment is very similar to the first and second embodiments described above, only differences will be discussed and otherwise referred to the first and second embodiments.
  • the third embodiment shown in FIG. 3 differs from the first and second embodiments described above in that, instead of a roll core 1 1 made of solid material, a roll core 1 1 'made of carbon fiber reinforced plastic CFRP is used.
  • a measuring device comprising a light source and a light detector for emitting light into the optical waveguide 21 "and detecting the light reflected from fiber Bragg gratings of the optical waveguide 21", a microprocessor for obtaining a measurement result from the values output by the light detector and a transmitter for outputting a measurement result via an air interface to the outside.
  • the energy required is supplied to the measuring device during rotation of the roller 1 "by inductive means.
  • the third embodiment differs from the first embodiment in the arrangement of the fiber Bragg grating sections 22 ".
  • the arrangement of the fiber Bragg grating sections 22 'in this embodiment is such that the density of the fiber -Bragg grid sections at the ends of the roll 1 "and thus higher in the region of the bearing, as in the center of the roll 1" .This allows the measurement of compressive forces on the roll in particularly interesting areas.
  • a second optical waveguide with fiber Bragg gratings is provided, which is arranged with respect to the first optical waveguide 21 and its fiber Bragg grating sections 22" as described in the second embodiment ,
  • a fourth embodiment of a roll 1 "' is shown schematically in perspective view in Figure 4. Since this embodiment is very similar to the first one with the third embodiment described above, only differences will be discussed and otherwise referred to the previous embodiments.
  • the optical waveguides 21, 21 ' are arranged with the fiber Bragg grating sections 22, 22' such that the individual optical waveguides 21, 21 'are sandwiched between two layers of the roller cover 12 (the individual layers are not specifically shown).
  • adjacent fiber Bragg grating sections 22 of the same optical waveguide 21 are arranged adjacent to one another in the circumferential direction of the roller along an extension of the optical waveguide 21, a distance 5 between two adjacent fiber optic waveguides 21 being arranged adjacent to each other.
  • the fiber Bragg grating sections 22, 22 'of each of the same optical waveguides 21, 21' lie in a circumferential direction relative to the axial direction of the roller 1 "' the entire roller circumference extending portion 6, whose extension in the axial direction of the roller 1 5 cm.
  • Axially adjacent fiber Bragg grating sections 22, 22 'of different optical waveguides 21, 21' in the present embodiment are spaced a constant distance and arranged so that their placement in the circumferential direction of the roller is offset by less than 1 cm ,
  • the fiber Bragg gratings of the same optical waveguide 21, 21 ' are each designed to reflect light of the same wavelength. With knowledge of the angular position of the roller 1 "'allows such an arrangement of the optical waveguides 21, 21' and fiber Bragg gratings detecting the Pressure distribution in the axial direction of the roll 1 "'at different rotation angles of the roll
  • the roll core 1 1' in the fourth embodiment is hollow and receives a measuring device which is connected to the optical waveguides 21, 21 '.
  • FIG. 5 schematically shows a perspective view of a roll 1 "" according to a fifth embodiment. Also in this embodiment, a part of a massive roll core 1 1 made of fiber-plastic composite FKV surrounding roll cover 12 is exposed and gives the view of several, embedded in a "base layer" of epoxy resin optical waveguides 21, 21 'with fiber Bragg Grid sections 22, 22 'free.
  • both ends 23, 23 ', 24' of the optical waveguides 21, 21 ' are each guided to the outside.
  • the fiber Bragg grating sections 22, 22 'of the individual optical waveguides 21, 21' are each arranged according to this embodiment along a helical curve which completely and partially sweeps over the roller in the axial direction and in the circumferential direction.
  • the arrangement of the fiber Bragg grating adjacent optical waveguides 21, 21 'so that in the circumferential direction adjacent fiber Bragg gratings have no or only a small offset in the axial direction of the roller.
  • the fiber Bragg grating sections each enclose an angle of approximately 0 ° with the circumferential direction of the roller, the present invention is not limited thereto. Rather, it is sufficient if the angle is less than 80 °, in particular less than 60 ° and more particularly less than 40 °.
  • the provision of a certain angle of in particular greater than 10 ° and in particular greater than 20 ° and more particularly greater than 30 ° may even be necessary at very high pressures and / or the embedding of the at least one optical waveguide in a relatively soft roll cover to excessive To avoid tensile load of at least one optical waveguide.
  • the fiber Bragg grating portions of the circumferential direction of the roll may include the following angular ranges:
  • a roll core is provided.
  • This may for example consist of metal or plastic, and be solid or hollow.
  • This may comprise a roll cover layer such as a "base layer”.
  • At least one optical waveguide with a plurality of fiber Bragg gratings is provided, wherein sections of the at least one optical waveguide, which each contain a fiber Bragg grating, with sections of the at least one optical waveguide which are free of a fiber Bragg grating, alternate in the longitudinal direction of the optical waveguide.
  • a marking is applied to the roll core or the roll reference layer, which identifies areas where a pressure measurement is to take place.
  • This marking can be applied for example by color or in the form of a groove in the roll core or roll cover can be introduced, which allows the inclusion of at least one optical waveguide.
  • the step of applying a mark is only optional.
  • sections of the at least one optical waveguide which sections each include a fiber Bragg grating, so that the sections with a circumferential direction to the roller at an angle of less than 80 ° and in particular less than 60 ° and further include less than 45 °.
  • the fixation can, for example, releasably by means of a Adhesive tape done, making corrections are easily possible.
  • sections of the at least one optical waveguide which sections each contain a fiber Bragg grating
  • they can also be permanently connected to the roller or the roller reference layer.
  • the step of removing the detachable connection can then be omitted.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un cylindre (1) pour machines à papier, comportant un mandrin (11), un revêtement (12) enrobant le mandrin (11) du cylindre et au moins un guide d'ondes optiques (21) doté de plusieurs réseaux de Bragg sur fibre (22). Le guide d'ondes optiques (21) est soit placé entre le mandrin (11) et le revêtement (12) du cylindre, soit noyé dans le revêtement (12) du cylindre. Des segments du guide d'ondes optiques (21) pourvus chacun d'un réseau de Bragg sur fibre (22) alternent avec des segments du guide d'ondes optiques (21) dépourvus de réseau de Bragg sur fibre (22), dans le sens longitudinal du guide d'ondes optiques (21). En outre, des segments du guide d'ondes optiques (21) pourvus chacun d'un réseau de Bragg sur fibre (22) forment, conjointement avec une direction circonférentielle du cylindre (1), un angle inférieur à 80°, en particulier inférieur à 60° et plus particulièrement inférieur à 45°.
EP12706227.1A 2011-02-25 2012-02-20 Cylindre pour machines à papier, avec capteurs à fibres de bragg Withdrawn EP2678652A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011004777 2011-02-25
DE201210202245 DE102012202245A1 (de) 2012-02-15 2012-02-15 Papiermaschinen-Walze mit Faser-Bragg-Sensoren
PCT/EP2012/052845 WO2012113747A1 (fr) 2011-02-25 2012-02-20 Cylindre pour machines à papier, avec capteurs à fibres de bragg

Publications (1)

Publication Number Publication Date
EP2678652A1 true EP2678652A1 (fr) 2014-01-01

Family

ID=45771798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12706227.1A Withdrawn EP2678652A1 (fr) 2011-02-25 2012-02-20 Cylindre pour machines à papier, avec capteurs à fibres de bragg

Country Status (5)

Country Link
US (1) US20130345035A1 (fr)
EP (1) EP2678652A1 (fr)
CN (1) CN103403513B (fr)
CA (1) CA2830088A1 (fr)
WO (1) WO2012113747A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012200387A1 (de) * 2012-01-12 2013-07-18 Voith Patent Gmbh Walze mit Sensoren für bahnverarbeitende Maschine
DE102012203035A1 (de) * 2012-02-28 2013-08-29 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
US9540769B2 (en) 2013-03-11 2017-01-10 International Paper Company Method and apparatus for measuring and removing rotational variability from a nip pressure profile of a covered roll of a nip press
DE102013205450B3 (de) * 2013-03-27 2014-07-10 Voith Patent Gmbh Walze
WO2014161755A1 (fr) * 2013-04-05 2014-10-09 Voith Patent Gmbh Presse de pelliculage
US9745698B2 (en) 2013-04-30 2017-08-29 Voith Patent Gmbh Sensor roll
DE102013208808A1 (de) * 2013-05-14 2014-11-20 Voith Patent Gmbh Filmpresse und Verfahren zum Betrieb einer Filmpresse
US10378980B2 (en) 2014-05-02 2019-08-13 International Paper Company Method and system associated with a sensing roll and a mating roll for collecting roll data
US9804044B2 (en) 2014-05-02 2017-10-31 International Paper Company Method and system associated with a sensing roll and a mating roll for collecting data including first and second sensor arrays
CN104002543A (zh) * 2014-05-09 2014-08-27 东莞长安至专光栅印刷厂 局部光学效果图案光学辊总成及局部光学片材制作方法
US9885151B2 (en) 2014-06-02 2018-02-06 Voith Patent Gmbh Press arrangement
US9816232B2 (en) 2015-06-10 2017-11-14 International Paper Company Monitoring upstream machine wires and felts
US9677225B2 (en) 2015-06-10 2017-06-13 International Paper Company Monitoring applicator rods
US10370795B2 (en) 2015-06-10 2019-08-06 International Paper Company Monitoring applicator rods and applicator rod nips
CN105300454A (zh) * 2015-11-13 2016-02-03 武汉理工大学 采煤机在线状态监测系统
US10989865B2 (en) * 2018-02-05 2021-04-27 University Of Georgia Research Foundation, Inc Stretchable fiber optic sensor
CN108458821B (zh) * 2018-03-19 2020-07-17 中车青岛四方机车车辆股份有限公司 一种轮座轴向应力的测量方法与标定装置
DE102019120052A1 (de) 2019-07-24 2021-01-28 SchäferRolls GmbH & Co. KG Technische Walze, insbesondere für die Papierherstellung, Verfahren zum Einbringen einer Polymerfaser in ein Leerrohr einer technischen Walze und Verwendung einer Polymerfaser

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI102624B1 (fi) * 1994-06-23 1999-01-15 Valmet Corp Menetelmä ja laite paperiradan tai vastaavan kuivatuksessa tai jäähdytyksessä
US5562027A (en) * 1995-02-16 1996-10-08 Stowe Woodward Licensco, Inc. Dynamic nip pressure and temperature sensing system
FI116481B (fi) * 2000-04-13 2005-11-30 Metso Paper Inc Komposiittirakenteinen tela ja menetelmä sen valmistamiseksi
US20050285059A1 (en) * 2004-06-24 2005-12-29 Gerber Terry L Apparatus and a method for detecting flatness defects of a web moving over a roller assembly
US7424193B2 (en) * 2004-07-14 2008-09-09 The Regents Of The University Of Michigan Composite waveguide
EP2331923B1 (fr) 2008-09-23 2013-06-19 Voith Patent GmbH Rouleau industriel avec système de capteur optique de couverture du rouleau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012113747A1 *

Also Published As

Publication number Publication date
CN103403513A (zh) 2013-11-20
WO2012113747A1 (fr) 2012-08-30
US20130345035A1 (en) 2013-12-26
CA2830088A1 (fr) 2012-08-30
CN103403513B (zh) 2016-03-16

Similar Documents

Publication Publication Date Title
EP2678652A1 (fr) Cylindre pour machines à papier, avec capteurs à fibres de bragg
EP2820187B1 (fr) Machine de production d'une bande fibreuse
DE69627639T2 (de) Sensorsystem zum messen von dynamischen druck in einem spalt zwischen zwei walzen
WO2013104600A1 (fr) Rouleau à capteurs pour machine de traitement de bande
DE69912301T2 (de) Sensor zur messung mechanischer spannungen mit fiber-optischen bragg gittern
DE60211331T2 (de) Schuhpressenband mit einem system zur erfassung von betriebsparametern
DE3131799C2 (de) Walzenpresse für Papier- und ähnliche Bahnen, insbesondere Kalander
AT506925A2 (de) Lastmessvorrichtung, herstellungsverfahren für die vorrichtung und steuerungsverfahren, das die vorrichtung verwendet
AT405950B (de) Pressmantel zur entwässerung einer papierbahn in einem pressspalt einer papiermaschine und verfahren zu seiner herstellung
DE60217093T2 (de) Lichtwellenleiter basiertes Gerät zur Oberflächenprofilierung
DE102012202245A1 (de) Papiermaschinen-Walze mit Faser-Bragg-Sensoren
DE102009039259B4 (de) Überwachung von Walzenlagern
DE102012221067A1 (de) Dehnungsmessstreifen und mechanische Komponente
DE102012002408B4 (de) Messanordnung und Verfahren zur Erfassung der Kraftbeanspruchung bei einem biegeweichen Objekt
WO2018141502A1 (fr) Dispositif de détection à fibre optique et procédé pour faire fonctionner un dispositif de détection à fibre optique
AT11371U1 (de) Presswalze, saugpresswalze, tragwalze oder tragtrommel
EP3662107B1 (fr) Chemise de presse et son utilisation ainsi que rouleau de presse et presse à sabot
EP3124661B1 (fr) Écartement dynamique de faisceaux de fibres continues pendant un processus de fabrication
EP3011102B1 (fr) Rouleau
WO2014020049A1 (fr) Procédé pour équiper un rouleau de capteurs à fibre optique, système de capteurs à fibre optique et rouleau comprenant un système de capteurs à fibre optique
DE60305281T2 (de) Drehmomentmessvorrichtung für einen drehenden Körper
EP3047793B1 (fr) Pansement
EP1331305A2 (fr) Cylindre mesureur
DE4135614A1 (de) Vorrichtung zur messung der spannungsverteilung ueber die breite von biegsamen baendern, insbesondere von stahlbaendern beim kaltwalzen
EP2232208B1 (fr) Dispositif avec au moins une bande et au moins un capteur pour déterminer le poids d'un liquide dans une section de bande qui ne porte pas de suspension de matière

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130925

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20150417

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20160528