EP0854233B1 - Process and apparatus for the damping of vibrations for rolls in contacting rotation - Google Patents

Process and apparatus for the damping of vibrations for rolls in contacting rotation Download PDF

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Publication number
EP0854233B1
EP0854233B1 EP97118892A EP97118892A EP0854233B1 EP 0854233 B1 EP0854233 B1 EP 0854233B1 EP 97118892 A EP97118892 A EP 97118892A EP 97118892 A EP97118892 A EP 97118892A EP 0854233 B1 EP0854233 B1 EP 0854233B1
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EP
European Patent Office
Prior art keywords
damping
rolls
active
nip
actuator
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EP97118892A
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German (de)
French (fr)
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EP0854233A3 (en
EP0854233A2 (en
Inventor
Martin Dr. Kustermann
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication of EP0854233A3 publication Critical patent/EP0854233A3/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/008—Vibration-preventing or -eliminating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/50—Vibrations; Oscillations

Definitions

  • the invention relates to a method and a device for damping contact vibrations rotating rollers in a paper machine or coating device according to the preamble of claim 1 and the preamble of claim 10.
  • the web to be produced runs over a large number of rollers, whereby again at many places at least two rolls with each other a nip form, through which the web runs, z. B. in the press section, in coating devices, in Winding units or smoothing devices. The problem of occurs again and again Contact vibrations.
  • the essence of the contact vibration is that the axes of the two nip-forming Rollers move relative to each other during operation and thus deform unintentionally.
  • a method for damping vibrations of a large mass is known from US Pat. No. 5,431,261.
  • a vibration suppressor with an additional mass is used, the additional mass acting against the mass to be damped.
  • EP-0 819 638 A a method and a winding device for winding a paper web into a roll with active Vibration damping described.
  • the winding device comprises a vibration suppressor with a additional suppressant, which acts on the pressure drum for the drum.
  • the vibration suppression device comprises at least one actuator that works hydraulically or pneumatically.
  • the actuator excites vibrations out of phase, causing the vibrations of the Pressure drum are largely suppressed.
  • the object of the invention is to provide a method and a device with which Contact vibrations of rolls forming a nip are reliably eliminated or at least can be dampened. No additional mass should as in the known prior art.
  • the object is characterized by the characterizing part of claim 1 and Claim 10 solved.
  • the inventors have recognized that effective damping of the vibrations of the interacting, d. H. nip-forming rollers only by active excitation from the outside to at least one of the bearing points of a roller (driver and / or drive side) can be achieved.
  • the forces to be introduced can also be outside or inside the bearing on the journal of the bearing.
  • a to the depository (s) 3 set sensor can measure the vibration of the rollers in an advantageous manner and forward a command for active damping via an actuator.
  • the counter vibration is a sine wave. But it can also be impulsive Have vibration characteristics (square wave).
  • the counter vibration need not act on any amplitude, but z. B. every second, third or fourth etc.
  • the exemplary embodiment relates to a coating device.
  • FIG. 1 shows the schematic view of two mutually parallel rollers 1 and 2 of a coating device with respectively associated known applicator units 3 and 4, which, however, are not to be explained in more detail here.
  • the web B to be coated runs, the direction of which is shown by an arrow.
  • the two rollers are shown lying horizontally next to one another in FIG .
  • other positions are also conceivable, for example one where the connection plane of their axes of rotation forms an angle with the horizontal or where the two rolls 1 and 2 are arranged directly vertically one above the other, wherein the running direction of the web B can also be different.
  • the right roller 2 is pivotably movable over a pivot mechanism 5 about a parallel to the rollers 1 and 2 pivot axis 6 stored in a warehouse 7.
  • the pivot mechanism 5 is z. B. by a Swivel cylinder 8 triggered.
  • the roller 1 is fixedly mounted in the bearing 9, which generally has a roller elastic cover, e.g. B. rubber, PU or the like.
  • the roller 2 is either also elastic covered or has a steel or chrome coating.
  • Actuator 10 is coupled to bearing 9
  • actuator 11 is coupled to bearing 7
  • actuator 12 initiates an excitation in parallel or in series with cylinder 8.
  • the actuators mentioned counteract the contact vibrations with counter frequencies.
  • the natural frequency of such systems is often between 30 and> 100 Hertz. All three named actuators can carry out active damping separately. However, variants are also conceivable, according to which the actuators 10 and 11, or actuators 10 and 12 act together.
  • the direction of action of the actuator 12 again corresponds to that of the actuator 11 due to the deflection via the pivot axis 6 (ie essentially the radial connecting line between the axes of rotation 7 and 9 of the nip-forming rollers 2 and 1.)
  • the damping of the contact vibration can also be used successfully with such Arrangement of rollers, as can be seen in Figure 2.
  • FIG. 2 shows a 2-roller application device with the two application rollers 1 and 2 and additional transfer rollers 13 and 14, which rotate in the opposite direction to the application rollers and likewise form a nip N (filled with liquid).
  • the web B passes through the nip N between the application rollers 1 and 2 in a different direction than in FIG . 1 .
  • the applicator rolls are generally (but not necessarily) the same Diameter on.
  • the transfer rollers 13 and 14 preferably each have one smaller diameter than the application rollers. At least one corresponding actuator 10 or 11 can then be used for vibration damping on at least one bearing Rollers 1 or 2, 13 or 14 are used.
  • the deflection (vibration) is plotted in mm x 10 -2 in the Y-axis and the time period in sec in the X-axis.
  • the deflection of the movable roller 2 is shown in FIG .
  • the full curve shows the strong deflection without active damping.
  • the dashed line shows the very weak - almost zero - deflection with active damping.
  • FIG. 1 A less pronounced deflection at the nip of the fixed roller 1 can be seen in FIG .
  • the deflection is drawn in full line without vibration damping and in dashed lines with vibration damping. From Figure 5 it can be seen that a hardly noticeable deflection occurs in the bearings 7 and 9. As in FIGS. 3 and 4 , the deflection with and without vibration damping is shown here with a dashed or full line.
  • Controlling the active damping of contact vibrations can be advantageous Way with the help of a known control loop.
  • a sensor detects this the actual values of the existing vibrations of the rollers.
  • These values will be a control computer unit for determining manipulated variables for active damping on the basis of a comparison of the actual values with predetermined target values.
  • the figures have been shown in the figures Regulation waived.

Landscapes

  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Replacement Of Web Rolls (AREA)
  • Pulleys (AREA)
  • Vibration Prevention Devices (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

To dampen the oscillations of rollers in contact with each other, especially in a paper web coating assembly, an active damping action is generated as a phase displaced counter oscillation. It is applied directly or indirectly, externally, on at least one roller bearing mounting. Also claimed is a roller assembly with at least two rollers pressed together, to form a nip between them, with each roller supported on bearing mountings at their end sides. One of the rollers, forming the nip, can be given a swing movement. Actuators (10-12) apply an external active action through a phase displaced counter oscillation, directly and/or indirectly on at least one bearing mounting (7) of a roller (1,2).

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Dämpfung von Kontaktschwingungen rotierender Walzen in einer Papiermaschine oder Streicheinrichtung gemäß dem Oberbegriff des Anspruches 1 sowie dem Oberbegriff des Anspruches 10.The invention relates to a method and a device for damping contact vibrations rotating rollers in a paper machine or coating device according to the preamble of claim 1 and the preamble of claim 10.

In Papiermaschinen läuft die herzustellende Bahn über eine Vielzahl von Walzen, wobei wiederum an vielen Stellen jeweils mindestens zwei Walzen miteinander einen Nip bilden, durch den die Bahn läuft, z. B. in der Pressenpartie, in Streicheinrichtungen, in Wickelaggregaten oder Glätteinrichtungen. Hierbei tritt immer wieder das Problem von Kontaktschwingungen auf.In paper machines, the web to be produced runs over a large number of rollers, whereby again at many places at least two rolls with each other a nip form, through which the web runs, z. B. in the press section, in coating devices, in Winding units or smoothing devices. The problem of occurs again and again Contact vibrations.

Das Wesen der Kontaktschwingung ist jenes, daß die Achsen der beiden nipbildenden Walzen sich im Betrieb relativ zueinander bewegen und so ungewollt verformen.The essence of the contact vibration is that the axes of the two nip-forming Rollers move relative to each other during operation and thus deform unintentionally.

Dieses Problem verstärkt sich umso mehr, je höher die Bahngeschwindigkeit ist (zum Teil über 2.000 m/min) und je breiter die Bahn und damit die Maschine mit ihren entsprechenden Walzen ist.The higher the web speed (the Part over 2,000 m / min) and the wider the web and thus the machine with its corresponding Is rolling.

Bei Bahngeschwindigkeiten von über 1.000 m/min und extrem großen Bahnbreiten, die bis zu 10 m betragen können, sind die Schwingungen so groß, daß die Walzen ungleichmäßig (polygonartig) sich verformen und verschleißen. Außerdem bewirken die Schwingungen eine schlechtere Runnability.At web speeds of over 1,000 m / min and extremely large web widths, the can be up to 10 m, the vibrations are so great that the rollers are uneven (polygonal) deform and wear out. In addition, the Vibrations a worse runnability.

Bei Streichmaschinen ist eine verschlechterte Qualität des Längsprofiles des aufgetragenen Striches zu verzeichnen. With coating machines, the quality of the longitudinal profile of the applied is deteriorated Dashes.

Es ist bereits bekannt, Schwingungen oder Durchbiegungen von Walzen auf passivem Wege zu dämpfen. Dies erfolgt z. B. durch Schaffung eines speziell gestalteten Strömungsquerschnittes eines Druckraumes in der stationären Zentralachse eines drehbaren Walzenmantels, wie in der DE 2950545 U1 offenbart ist.It is already known to vibrate or deflect rolls on passive Dampen ways. This is done e.g. B. by creating a specially designed flow cross-section a pressure chamber in the stationary central axis of a rotatable Roll shell, as disclosed in DE 2950545 U1.

Aus der US-5,431,261 ist ein Verfahren zur Dämpfung von Schwingungen einer großen Masse bekannt.
Bei diesem Verfahren wird ein Schwingungsunterdrücker mit einer zusätzlichen Masse verwendet, wobei die zusätzliche Masse gegen die zu dämpfende Masse wirkt.A method for damping vibrations of a large mass is known from US Pat. No. 5,431,261.
In this method, a vibration suppressor with an additional mass is used, the additional mass acting against the mass to be damped.

In der noch nicht vorveröffentlichten Anmeldung EP-0 819 638 A ist ein Verfahren und eine Wickelvorrichtung zum Aufwickeln einer Papierbahn zu einer Rolle mit aktiver Schwingungsdämpfung beschrieben.In the not yet prepublished application EP-0 819 638 A a method and a winding device for winding a paper web into a roll with active Vibration damping described.

Hierbei umfaßt die Wickelvorrichtung eine Schwingungsunterdrückvorrichtung mit einer zusätzlichen Unterdrückmasse, die auf die Anpreßtrommel für den Tambour wirkt.Here, the winding device comprises a vibration suppressor with a additional suppressant, which acts on the pressure drum for the drum.

Die Schwingungsunterdrückvorrichtung umfaßt dabei mindestens einen Aktuator, der auf hydraulischem oder pneumatischem Wege arbeitet.The vibration suppression device comprises at least one actuator that works hydraulically or pneumatically.

Der Aktuator erregt Schwingungen phasenversetzt, wodurch die Schwingungen der Anpreßtrommel weitgehend unterdrückt werden.The actuator excites vibrations out of phase, causing the vibrations of the Pressure drum are largely suppressed.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung anzugeben, mit denen Kontaktschwingungen von einander einen Nip bildenden Walzen zuverlässig beseitigt oder zumindest gedämpft werden können. Dabei soll keine zusätzliche Masse, wie beim bekannten Stand der Technik, Verwendung finden.The object of the invention is to provide a method and a device with which Contact vibrations of rolls forming a nip are reliably eliminated or at least can be dampened. No additional mass should as in the known prior art.

Erfindungsgemäß wird die Aufgabe durch das Kennzeichen des Anspruches 1 und des Anspruches 10 gelöst.According to the invention the object is characterized by the characterizing part of claim 1 and Claim 10 solved.

Zweckmäßige Ausgestaltungen ergeben sich aus den Unteransprüchen. Appropriate configurations result from the subclaims.

Die Erfinder haben erkannt, daß eine effektive Dämpfung der Schwingungen der zusammenwirkenden, d. h. nipbildenden Walzen nur durch eine aktive Anregung von außen auf wenigstens eine der Lagerstellen einer Walze (führer- und/oder triebseitig) erreicht werden kann. Die einzuleitenden Kräfte können dabei auch außer- oder innerhalb der Lagerstelle auf den Zapfen der Lagerung wirken. Ein an die Lagerstelle(n) 3 gesetzter Sensor kann die Schwingung der Walzen in vorteilhafter Weise messen und einen Befehl zur aktiven Dämpfung über ein Stellglied weiterleiten.The inventors have recognized that effective damping of the vibrations of the interacting, d. H. nip-forming rollers only by active excitation from the outside to at least one of the bearing points of a roller (driver and / or drive side) can be achieved. The forces to be introduced can also be outside or inside the bearing on the journal of the bearing. A to the depository (s) 3 set sensor can measure the vibration of the rollers in an advantageous manner and forward a command for active damping via an actuator.

Es ist auch denkbar, den Sensor in Maschinenmitte zu positionieren.It is also conceivable to position the sensor in the middle of the machine.

Zur aktiven Dämpfung werden vorteilhafterweise solche Elemente benutzt, die eine Selbstanpassung an veränderte Bedingungen erlauben.For active damping, those elements are advantageously used that have a Allow self-adaptation to changing conditions.

Dies ist sehr wichtig, um auf geänderte Produktionsverhältnisse (z. B. Geschwindigkeit) oder Maschinenverhältnisse (z. B. alternder Gummibezug der Walzen mit den damit verbundenen anderen elastischen Eigenschaften) richtig und schnell reagieren zu können.This is very important in order to reflect changes in production conditions (e.g. speed) or machine conditions (e.g. aging rubber covering of the rollers with the connected other elastic properties) to react correctly and quickly.

In überraschender und nicht erwarteter Weise hat sich gezeigt, daß eine aktive und effektive Gegenmaßnahme an mindestens einer Lagerstelle trotz des dort liegenden Schwingungsknotens möglich ist.Surprisingly and unexpectedly, it has been shown that an active and effective countermeasure at at least one storage location despite the one located there Vibration node is possible.

Die Gegenschwingung ist eine Sinusschwingung. Sie kann aber auch eine impulsartige Schwingungscharakteristik (Rechteckschwingung) aufweisen. Die Gegenschwingung braucht nicht auf jede Amplitude wirken, sondern z. B. auf jede zweite, dritte oder vierte usw.The counter vibration is a sine wave. But it can also be impulsive Have vibration characteristics (square wave). The counter vibration need not act on any amplitude, but z. B. every second, third or fourth etc.

Nachfolgend soll die Erfindung anhand eines Ausführungsbeispiels näher erläutert werden:The invention will be explained in more detail below using an exemplary embodiment become:

Das Ausführungsbeispiel bezieht sich dabei auf eine Streicheinrichtung. The exemplary embodiment relates to a coating device.

Figur 1 zeigt die schematische Ansicht zweier zueinander angeordneter paralleler Walzen 1 und 2 einer Streicheinrichtung mit jeweils zugeordneten bekannten Auftragswerken 3 und 4, die hier aber nicht näher erläutert werden sollen. Zwischen beiden Walzen durch den Nip N läuft die zu beschichtende Bahn B, deren Laufrichtung mit einem Pfeil dargestellt ist. FIG. 1 shows the schematic view of two mutually parallel rollers 1 and 2 of a coating device with respectively associated known applicator units 3 and 4, which, however, are not to be explained in more detail here. Between the two rolls through the nip N, the web B to be coated runs, the direction of which is shown by an arrow.

Die beiden Walzen sind in der Figur 1 waagrecht nebeneinander liegend dargestellt. Selbstverständlich sind auch andere Positionen denkbar, beispielsweise eine solche, wo die Verbindungsebene ihrer Rotationsachsen mit der Horizontalen einen Winkel bildet oder wo die beiden Walzen 1 und 2 direkt senkrecht übereinander angeordnet sind, wobei die Laufrichtung der Bahn B auch eine andere sein kann.The two rollers are shown lying horizontally next to one another in FIG . Of course, other positions are also conceivable, for example one where the connection plane of their axes of rotation forms an angle with the horizontal or where the two rolls 1 and 2 are arranged directly vertically one above the other, wherein the running direction of the web B can also be different.

Im gewählten Ausführungsbeispiel ist die rechte Walze 2 schwenkbar beweglich über einen Schwenkmechanismus 5 um eine zu den Walzen 1 und 2 parallele Schwenkachse 6 in einem Lager 7 gelagert. Der Schwenkmechanismus 5 wird z. B. durch einen Schwenkzylinder 8 ausgelöst.In the selected embodiment, the right roller 2 is pivotably movable over a pivot mechanism 5 about a parallel to the rollers 1 and 2 pivot axis 6 stored in a warehouse 7. The pivot mechanism 5 is z. B. by a Swivel cylinder 8 triggered.

Die Walze 1 ist fest in Lagerung 9 gelagert, wobei diese in der Regel eine Walze mit elastischem Bezug, z. B. Gummi, PU o. ä. ist. Die Walze 2 ist entweder ebenfalls elastisch bezogen oder hat einen Stahl- oder Chrommantel.The roller 1 is fixedly mounted in the bearing 9, which generally has a roller elastic cover, e.g. B. rubber, PU or the like. The roller 2 is either also elastic covered or has a steel or chrome coating.

Aus Figur 1 ist des weiteren entnehmbar die Anordnung von erfindungsgemäßen Aktuatoren 10,11,12. Aktuator 10 ist an das Lager 9 gekoppelt, Aktuator 11 ist an das Lager 7 gekoppelt, und Aktuator 12 leitet eine Anregung parallel oder seriell zum Zylinder 8 ein. Die genannten Aktuatoren wirken den Kontaktschwingungen mit Gegenfrequenzen entgegen. Die Eigenfrequenz solcher Systeme beträgt häufig zwischen 30 und > 100 Hertz. Alle drei genannten Aktuatoren können getrennt die aktive Dämpfung ausführen. Es sind aber auch Varianten denkbar, wonach der Aktuator 10 und 11, oder Aktuator 10 und 12 gemeinsam wirken. Bei letzterem Fall entspricht dann die Wirkrichtung des Aktuators 12 aufgrund der Umlenkung über Schwenkachse 6 wieder der von Aktuator 11 (also im wesentlichen der radialen Verbindungslinie zwischen den Rotationsachsen 7 und 9 der nipbildenden Walzen 2 und 1.)Of Figure 1 is further seen from the arrangement of the invention the actuators 10,11,12. Actuator 10 is coupled to bearing 9, actuator 11 is coupled to bearing 7, and actuator 12 initiates an excitation in parallel or in series with cylinder 8. The actuators mentioned counteract the contact vibrations with counter frequencies. The natural frequency of such systems is often between 30 and> 100 Hertz. All three named actuators can carry out active damping separately. However, variants are also conceivable, according to which the actuators 10 and 11, or actuators 10 and 12 act together. In the latter case, the direction of action of the actuator 12 again corresponds to that of the actuator 11 due to the deflection via the pivot axis 6 (ie essentially the radial connecting line between the axes of rotation 7 and 9 of the nip-forming rollers 2 and 1.)

Es sind auch weitere Modifikationen denkbar, bei denen beispielsweise ein zweiter Aktuator 11'am Lager 7 angeordnet ist und dabei die Wirkrichtungen der Aktuatoren 11 und 11' im wesentlichen senkrecht aufeinander treffen.Further modifications are also conceivable, for example a second one Actuator 11 'is arranged on the bearing 7 and the directions of action of the actuators 11 and 11 'meet substantially perpendicularly.

Die Dämpfung der Kontaktschwingung ist auch erfolgreich einsetzbar bei einer solchen Anordnung von Walzen, wie sie aus Figur 2 entnehmbar ist.The damping of the contact vibration can also be used successfully with such Arrangement of rollers, as can be seen in Figure 2.

Die Figur 2 zeigt eine 2-Walzen-Auftragsvorrichtung mit den zwei Auftragswalzen 1 und 2 und zusätzlichen Übertragungswalzen 13 und 14, die gegenläufig zu den Auftragswalzen rotieren und mit diesen ebenfalls einen Nip N (flüssigkeitsgefüllt) bilden. FIG. 2 shows a 2-roller application device with the two application rollers 1 and 2 and additional transfer rollers 13 and 14, which rotate in the opposite direction to the application rollers and likewise form a nip N (filled with liquid).

Den Nip N zwischen Auftragswalze 1 und 2 durchläuft hier die Warenbahn B in anderer Richtung als bei Figur 1.The web B passes through the nip N between the application rollers 1 and 2 in a different direction than in FIG . 1 .

Die Auftragswalzen weisen im allgemeinen (aber nicht notwendigerweise) den gleichen Durchmesser auf. Die Übertragungswalzen 13 und 14 haben vorzugsweise je einen kleineren Durchmesser als die Auftragswalzen. Wenigstens ein entsprechender Aktuator 10 oder 11 kann dann zur Schwingungsdämpfung an wenigstens einem Lager dieser Walzen 1 oder 2, 13 oder 14 eingesetzt werden.The applicator rolls are generally (but not necessarily) the same Diameter on. The transfer rollers 13 and 14 preferably each have one smaller diameter than the application rollers. At least one corresponding actuator 10 or 11 can then be used for vibration damping on at least one bearing Rollers 1 or 2, 13 or 14 are used.

Untersuchungen im Nip zwischen einer beweglichen und einer festen Walze haben folgende Auslenkungen (Schwingungen) ergeben, die mit nachfolgenden Figuren 3, 4 und 5 verdeutlicht werden sollen. Die Auslenkung wurde jeweils in der Mitte der Walzen 1 und 2, also dort, wo bei der hier untersuchten Schwingungsform auch die Verformung am stärksten ist, ermittelt.Investigations in the nip between a movable and a fixed roller have shown the following deflections (vibrations), which are to be illustrated with the following FIGS. 3, 4 and 5 . The deflection was determined in each case in the middle of the rolls 1 and 2, that is to say where the deformation is also strongest in the case of the vibration form examined here.

In der Y-Achse ist die Auslenkung (Schwingung) in mm x 10-2 und in der X-Achse die Zeitdauer in sec aufgetragen. The deflection (vibration) is plotted in mm x 10 -2 in the Y-axis and the time period in sec in the X-axis.

In der Figur 3 ist die Auslenkung der beweglichen Walze 2 dargestellt. Die volle Kurve zeigt dabei die starke Auslenkung ohne aktive Dämpfung. In gestrichelter Linie ist die nur noch sehr schwach-fast auf Null gehende - Auslenkung bei aktiver Dämpfung dargestellt.The deflection of the movable roller 2 is shown in FIG . The full curve shows the strong deflection without active damping. The dashed line shows the very weak - almost zero - deflection with active damping.

In Figur 4 ist eine weniger starke Auslenkung am Nip der festen Walze 1 zu erkennen. Auch hier ist in voller Linie die Auslenkung ohne Schwingungsdämpfung und in gestrichelter Linie mit Schwingungsdämpfung gezeichnet.
Aus Figur 5 ist ersichtlich, daß eine kaum zu verzeichnende Auslenkung in den Lagerungen 7 und 9 auftritt. Wie bei Figur 3 und 4 ist auch hier die Auslenkung mit und ohne Schwingungsdämpfung mit gestrichelter bzw. voller Linie dargestellt.A less pronounced deflection at the nip of the fixed roller 1 can be seen in FIG . Here, too, the deflection is drawn in full line without vibration damping and in dashed lines with vibration damping.
From Figure 5 it can be seen that a hardly noticeable deflection occurs in the bearings 7 and 9. As in FIGS. 3 and 4 , the deflection with and without vibration damping is shown here with a dashed or full line.

Eine Regelung der aktiven Dämpfung von Kontaktschwingungen kann in vorteilhafter Weise mit Hilfe eines an sich bekannten Regelkreises arbeiten. Ein Sensor erfaßt dabei die Ist-Werte der vorhandenen Schwingungen der Walzen. Diese Werte werden einer Steuerrechnereinheit zur Ermittlung von Stellgrößen für die aktive Dämpfung aufgrund eines Abgleiches der Ist-Werte mit vorgegebenen Soll-Werten weitergegeben. Aus Übersichtlichkeitsgründen wurde in den Figuren auf zeichnerische Darstellung der Regelung verzichtet.Controlling the active damping of contact vibrations can be advantageous Way with the help of a known control loop. A sensor detects this the actual values of the existing vibrations of the rollers. These values will be a control computer unit for determining manipulated variables for active damping on the basis of a comparison of the actual values with predetermined target values. For the sake of clarity, the figures have been shown in the figures Regulation waived.

Claims (16)

  1. Method of damping contact vibrations of rotating rolls in a papermaking machine, but in particular in a coating device, the rolls being held in mountings at the ends and at least two rolls forming a nip with each other, it being possible for one of the nip-forming rolls to be pivoted away or moved away, and the damping being carried out actively, the active excitation, that is to say a phase-shifted opposing vibration, acting from the outside directly and/or indirectly on at least one bearing point of a roll.
  2. Method according to Claim 1, characterized in that the direct active excitation is introduced onto at least one end bearing point on the operator and/or drive side.
  3. Method according to Claim 1, characterized in that the indirect active excitation is introduced via the pivoting mechanism of the roll that can be pivoted away.
  4. Method according to Claims 1 to 3, characterized in that the opposing vibration is a sinusoidal vibration or has a pulse-like vibration characteristic.
  5. Method according to Claims 1 to 4, characterized in that for the purpose of active damping, actuators with a damping frequency according to f = 1/T are used, T, as the period of a vibration, being an integral multiple of the vibration to be damped.
  6. Method according to Claim 3, characterized in that for the purpose of indirect damping, the damping actuator is connected in series with that actuator which carries out the pivoting movement of the pivotable roll, their two strokes adding.
  7. Method according to one or more of the preceding claims, characterized in that the actuators used for the active excitation are those which operate in a thermal, hydraulic, pneumatic, electrical, electromagnetic, magnetic, magnetostrictive or piezoelectric way.
  8. Method according to one or more of the preceding claims, characterized in that the active direction of the active excitation substantially corresponds to the radial connecting line between the axes of rotation of the nip-forming rolls.
  9. Method according to one or more of the preceding claims, characterized in that the active damping operates with the aid of a control loop, a sensor registering the undesired vibrations of the rolls and passing these onto a control computing unit to determine actuating variables for the active damping on the basis of a comparison between the actual values and predefined desired values.
  10. Method according to Claim 9, characterized in that each damping actuator operates with its own control loop, these being coordinated with one another.
  11. Apparatus for damping contact vibrations of rotating rolls in a papermaking machine, in particular in a coating machine,
    having at least two rolls which, pressed against each other, form a nip with each other,
    the rolls are held in mountings at the ends,
    one of the nip-forming rolls is constructed such that it can be pivoted away,
    actuators (10, 11, 12) being provided, which introduce an active excitation, that is to say a phase-offset opposing vibration, from the outside directly and/or indirectly onto at least one bearing point (7, 9) of a roll (1, 2, 13, 14).
  12. Apparatus according to Claim 11, characterized in that the roll which experiences active excitation, that is to say an opposing vibration, has only one actuator coupled to it on the operator and/or drive side.
  13. Apparatus according to Claim 11, characterized in that the roll which experiences active excitation has two actuators coupled to it, whose active directions meet each other substantially perpendicularly.
  14. Apparatus according to Claim 11, characterized in that the rolls (1, 2, 13, 14) that form a nip with each other are each provided with an actuator, whose active direction preferably runs towards the nip.
  15. Apparatus according to at least one of Claims 11 to 14, characterized in that an actuator (12) is coupled to the pivoting mechanism (5) of the roll (2) that can be pivoted in, the actuator (12) being connected in series with the pivoting actuator (8).
  16. Apparatus according to one or more of Claims 11 - 15, characterized in that a control loop is provided with at least one sensor and a control computing unit for regulating the active damping.
EP97118892A 1996-12-18 1997-10-30 Process and apparatus for the damping of vibrations for rolls in contacting rotation Expired - Lifetime EP0854233B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19652769 1996-12-18
DE19652769A DE19652769A1 (en) 1996-12-18 1996-12-18 Method and device for damping contact vibrations

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EP0854233A2 EP0854233A2 (en) 1998-07-22
EP0854233A3 EP0854233A3 (en) 2000-05-31
EP0854233B1 true EP0854233B1 (en) 2003-10-15

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EP97118892A Expired - Lifetime EP0854233B1 (en) 1996-12-18 1997-10-30 Process and apparatus for the damping of vibrations for rolls in contacting rotation

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US (2) US6156158A (en)
EP (1) EP0854233B1 (en)
JP (1) JPH10202173A (en)
AT (1) ATE252180T1 (en)
DE (2) DE19652769A1 (en)

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Also Published As

Publication number Publication date
DE59710860D1 (en) 2003-11-20
US6156158A (en) 2000-12-05
US20010000065A1 (en) 2001-03-29
EP0854233A3 (en) 2000-05-31
EP0854233A2 (en) 1998-07-22
JPH10202173A (en) 1998-08-04
DE19652769A1 (en) 1998-06-25
ATE252180T1 (en) 2003-11-15
US6419794B2 (en) 2002-07-16

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