EP1746204B1 - Procédé et dispositif pour réduire les vibrations dans les machines à papier - Google Patents
Procédé et dispositif pour réduire les vibrations dans les machines à papier Download PDFInfo
- Publication number
- EP1746204B1 EP1746204B1 EP06110274A EP06110274A EP1746204B1 EP 1746204 B1 EP1746204 B1 EP 1746204B1 EP 06110274 A EP06110274 A EP 06110274A EP 06110274 A EP06110274 A EP 06110274A EP 1746204 B1 EP1746204 B1 EP 1746204B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotational speed
- vibration
- roll
- change
- speed
- 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.)
- Not-in-force
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Classifications
-
- 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
Definitions
- This invention relates to a method for reducing vibrations, in particular resonant vibrations, of rotating rollers in machines for producing and / or processing webs of material, in particular fibrous webs such as, for example, paper, board or tissue webs. Furthermore, the invention relates to a device for carrying out the method according to the invention.
- the DE 102 04 770 discloses a method of vibration damping in which phased out to the vibration of the roller are introduced into these forces.
- the US 5,961,899 discloses a method in which counter vibrations are generated for vibration damping in calender systems.
- the object is achieved by a method for reducing resonances of vibrations in a machine for producing and / or processing a material web, in particular with nip-forming roller pairs, by carrying out suitable measures for reducing vibrations leading to resonance in at least one rotating roller are, with the appropriate measures include that the speed of the at least one roller is repeatedly changed over time or in other words in time sequence repeatedly.
- the invention is based on the finding that it is almost impossible due to the large number of natural frequencies in today's web-processing or manufacturing machines to find a meaningful for a sufficient productivity speed range of rollers by no natural frequency occurs. Therefore, the invention proposes to change the speed of at least one roller again and again during the operating time, wherein the speeds set here can stimulate both natural frequencies and no natural frequencies in the machine. Due to the repetitive change of the rotational speed, however, it is achieved that not enough energy is coupled into the system comprising the roller in order to generate disturbing resonances for the production.
- the vibration state of the machine, in particular the at least one roller is determined. For example, determining the power consumption of the drive of the at least one roller and / or measuring the vibration state by means of displacement and / or speed and / or acceleration sensors.
- the relative vibration between machine eg. Machine chair and roller or the relative vibration between several rollers or the relative vibration between different parts of the machine frame can be measured.
- Speed and acceleration sensors are firmly connected to the machine frame and measure their vibration. Both sensors must be placed where an energy input leads to a measurable vibration. In this case, the sensors detect an emerging energy input (for example, time and intensity of the energy injection) and can thus be used as a measuring system for the speed change.
- an emerging energy input for example, time and intensity of the energy injection
- the starting resonance is counteracted by changing the rotational speed of the rollers of the calender.
- the rotational speed is changed in the determination of emerging and / or occurring resonance in the vibration state. This requires that the vibration state of the machine, in particular the roller is determined periodically. In the event of resonance oscillation, the regulation starts in such a way that the rotational speed of the at least one roller is actively set to a different rotational speed. If a resonance is determined again after a certain time at the speed set in this way, the speed is again set to another value and so on.
- the rotational speed of the roller is changed over time without ascertaining the oscillation state such that not enough energy is coupled into the roller to generate resonance.
- the triggering moment for the change in the speed is not the determination of an impending resonance in this case. Rather, it is avoided in this case from the outset that a resonance can set only slightly by the period in which the roller is operated at a fixed speed is so short, so that in the event that this speed is a natural vibration frequency of the system , not enough energy can be injected into the system to produce a resonance.
- the size of the change in the rotational speed and / or the duration of the change in the rotational speed can be adjusted taking into account the determined vibration state.
- the determination of the vibration state thus triggers, in contrast to the above embodiment, not a speed change, but is used to determine the change values.
- the magnitude of the change in the rotational speed it is possible for the magnitude of the change in the rotational speed to be adaptively adapted to the determined vibration state, for example by estimating, on the basis of the determined vibration state, the magnitude of the change in the rotational speed necessary to prevent resonant vibration.
- a possible embodiment of the invention therefore provides that the rotational speed is repeatedly increased and / or reduced with respect to an output rotational speed. This ensures that the speed of the at least one roller for the effective prevention of resonance must be removed too far from the optimum for productivity working speed.
- the size of the change in the speed and / or the duration of the change in the speed is stochastic and / or chaotic. That it is determined stochastically or chaotically by what amount the rotational speed changes in relation to an output rotational speed or to an average rotational speed and / or how long the so changed rotational speed is maintained until the renewed change.
- each speed is kept constant as long as possible.
- a preferred embodiment of the invention therefore provides that the speed changes in time plateau.
- the rotational speed changes periodically in time, such as, for example, sinusoidally or sawtooth-shaped.
- a preferred embodiment of the invention therefore provides that the rotational speed of at least two rolls forming at least one nip is changed.
- the method according to the invention is preferably used when operating nip-forming roller arrangements, in particular at least one press and / or a size press and / or an offset press and / or a calender and / or a calender and / or a supercalender.
- rollers at different points of the machine in the inventive method and depending on the determined vibrations of the machine, for example. At a different location of the rollers to change the speed of the respective rollers each differently.
- the device for reducing vibrations in a machine for producing and / or processing a material web, in particular with nip-forming roller pairs comprises a control unit for influencing at least one rotating roller which is designed to repeatedly increase the rotational speed of the roller over time and a measuring device for determining the vibration state of the machine, in particular the roller, which is coupled to the control unit.
- control unit is coupled to the measuring device such that the speed is changed in the determination of emerging and / or occurring resonances in the vibrational state.
- control unit is coupled to the measuring device in such a way that the magnitude of the change in the rotational speed and / or the time duration of the change in the rotational speed takes into account the determined vibration state.
- the FIG. 1 shows a device 1 for carrying out the method according to the invention for reducing vibrations in a machine for producing and / or processing a material web.
- a roll pair formed by rollers 2 and 3 to recognize, which includes a nip 4 between them.
- the pair of rollers 2, 3 is arranged on a schematically shown stiffening 5 of the machine.
- the two rollers 2 and 3 are each driven by a drive device 7 and 8 respectively.
- the two drive devices 7 and 8 are controlled by a control unit 9, which communicates with speed sensors 10 and 11, which interact with one of the rollers 2 and 3 respectively.
- the device 1 has a measuring device 6 for determining the vibration state of the machine, in particular the rollers 2 and 3 and the stiffening 5.
- the vibration state of the machine can be determined by means of a mounted on the chair 5 vibration sensor 12.
- the rotational speed of the two rollers 2 and 3 is repeatedly changed over time to reduce the vibrations. This happens in the in the FIG. 1 illustrated embodiment by temporal change in the power output of the control unit 9 to the two drives 7 and 8, wherein the speed thus achieved is monitored by the two speed sensors 10 and 11.
- the measuring device 6 is coupled to the control unit 9 such that the rotational speed of the two rollers 2 and 3 is changed in the determination of emerging and / or occurring resonances in the vibration state of the rollers 2 and 3 and the stiffening 5. That In the present case, a change in the rotational speed of the two rollers 2 and 3 by the control unit 9 always takes place when the determined by the measuring device 6 vibrational state can conclude to a resonance or to an imminent resonance.
- the speed of the rollers 2 and 3 could be varied in time independently of the determination of resonance in the vibration state, that not enough energy is coupled into the roller for generating resonance.
- control unit 9 and the measuring device 6 are coupled such that the magnitude of the change in the rotational speed and / or the time duration of the change in the rotational speed takes place taking into account the determined vibration state.
- the magnitude of the change in the rotational speed and / or the duration of the change in the rotational speed could also be stochastic and / or chaotic.
- Roller pair 2 and 3 shown may be, for example, a pair of rollers in a press or in a size press or in an offset press or in a calender or in a calender or in a supercalender.
- the method according to the invention is, of course, expandable to the control of 10 or more rolls, such as, for example, in the case of a calender 10 Nip without departing from the subject matter of the invention.
- FIG. 2 different courses of speed changes are shown by the method according to the invention.
- the original power output signal is applied in each case with a correction signal, so that from the control unit 9 to the drives 7 and 8, a power output is such that the two rollers 2 and 3 one of the two in the Figures 2a or 2b have shown speed curves.
- the original speed is assumed to be constant over time and extends along the time axis of the value ⁇ Figures 2a, 2b and 2c ,
- the Indian FIG. 2a illustrated sinusoidal temporal speed curve is generated by a sinusoidal Korrektursig signal, wherein the amplitude and the frequency of the sinusoidal speed change changes over time.
- the magnitude of the change in the rotational speed in this case: amplitude
- the duration of the change in the rotational speed (here: frequency) takes place in consideration of the determined oscillation state.
- the rotational speed is also kept constant at a plateau for a relatively long time, as indicated by the reference numeral 1, if there is no energy injection.
- temporal speed curve is a sawtooth course.
- the speed curve is generated by a sawtooth-shaped correction signal, with which the original output signal, analogous to FIG. 2a , is charged.
- the amplitude and the frequency of the sawtooth speed change are changed over time.
- the Figure 2c shows a further possible temporal speed curve, in which the speed is plateau-shaped, that changes from a constant speed level to another constant speed level.
- the change can be sudden or in the form of a flat or steep speed change ramp.
- a plateau-shaped speed curve can be achieved, for example, when the magnitude of the change in rotational speed takes place taking into account the determined vibration state, so that a new rotational speed is found whose level can be kept as long as possible.
Landscapes
- Paper (AREA)
- Vibration Prevention Devices (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Claims (18)
- Procédé pour réduire les vibrations dans une machine de fabrication et/ou de traitement d'une nappe de matériau, notamment avec des paires de rouleaux formant un pinçage, dans lequel on prend des mesures appropriées pour réduire les vibrations en agissant sur au moins un rouleau en rotation,
caractérisé en ce que
les mesures appropriées incluent que la vitesse de rotation du rouleau est modifiée de manière répétée dans le temps. - Procédé selon la revendication 1,
caractérisé en ce que
l'état de vibration de la machine, en particulier du rouleau, est déterminé. - Procédé selon la revendication 2,
caractérisé en ce que
l'état de vibration du rouleau est déterminé à partir de l'enregistrement de puissance de l'entraînement du rouleau et/ou au moyen de capteurs de course, et/ou de vitesse et/ou d'accélération. - Procédé selon la revendication 2 ou 3,
caractérisé en ce que
la vitesse de rotation est modifiée lors de la détermination de résonances sur le point de se produire et/ou se produisant dans l'état de vibration. - Procédé selon la revendication 1,
caractérisé en ce que
la vitesse de rotation du rouleau est modifiée dans le temps sans déterminer l'état de vibration, de telle sorte qu'il n'y ait pas suffisamment d'énergie injectée dans le rouleau pour produire une résonance. - Procédé selon l'une quelconque des revendications 1 à 5,
caractérisé en ce que la vitesse de rotation est augmentée et/ou réduite par rapport à une vitesse de rotation de départ. - Procédé selon l'une quelconque des revendications 1 à 6,
caractérisé en ce que
l'ampleur de la variation de la vitesse de rotation et/ou la durée de la variation de la vitesse de rotation se produisent de manière stochastique et/ou chaotique. - Procédé selon l'une quelconque des revendications 2 à 6,
caractérisé en ce que
l'ampleur de la variation de la vitesse de rotation et/ou la durée de la variation de la vitesse de rotation se produisent en tenant compte de l'état de vibration déterminé. - Procédé selon l'une quelconque des revendications 1 à 8,
caractérisé en ce que
la vitesse de rotation varie dans le temps en forme de plateau. - Procédé selon la revendication 9,
caractérisé en ce que
la vitesse de rotation saute d'un plateau à un autre. - Procédé selon la revendication 1 à 10,
caractérisé en ce que
la vitesse de rotation varie périodiquement dans le temps. - Procédé selon la revendication 11,
caractérisé en ce que
la vitesse de rotation varie en dents de scie ou en forme sinusoïdale. - Procédé selon la revendication 12,
caractérisé en ce que
l'amplitude et/ou la fréquence de la variation de la vitesse de rotation varient de manière sinusoïdale ou en dents de scie. - Procédé selon l'une quelconque des revendications 1 à 13,
caractérisé en ce que
l'on fait varier la vitesse de rotation d'au moins deux rouleaux formant au moins un pinçage. - Utilisation du procédé selon l'une quelconque des revendications précédentes pour faire fonctionner des agencements de rouleaux formant un pinçage, notamment au moins une presse et/ou une presse à encoller et/ou une presse offset et/ou une lisseuse et/ou une calandre et/ou une supercalandre.
- Dispositif pour réduire les vibrations dans une machine pour la fabrication et/ou le traitement d'une nappe de matériau, notamment avec des paires de rouleaux formant un pinçage, comprenant un système de réglage pour influer sur au moins un rouleau en rotation, et comprenant un dispositif de mesure pour déterminer l'état de vibration de la machine, en particulier du rouleau, qui est accouplé au système de réglage,
caractérisé en ce que
la vitesse de rotation du rouleau peut être modifiée par le système de réglage de manière répétée dans le temps. - Dispositif selon la revendication 16,
caractérisé en ce que
le système de réglage est accouplé au dispositif de mesure de telle sorte que la vitesse de rotation soit modifiée lors de la détermination de résonances sur le point de se produire et/ou se produisant dans l'état de vibration. - Dispositif selon la revendication 16 ou 17,
caractérisé en ce que
le système de réglage est accouplé au dispositif de mesure de telle sorte que l'ampleur de la variation de la vitesse de rotation et/ou la durée de la variation de la vitesse de rotation se produisent en tenant compte de l'état de vibration déterminé.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005022874A DE102005022874A1 (de) | 2005-05-18 | 2005-05-18 | Verfahren zur Schwingungsreduzierung in Papiermaschinen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1746204A2 EP1746204A2 (fr) | 2007-01-24 |
EP1746204A3 EP1746204A3 (fr) | 2007-06-27 |
EP1746204B1 true EP1746204B1 (fr) | 2008-06-18 |
Family
ID=37311015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06110274A Not-in-force EP1746204B1 (fr) | 2005-05-18 | 2006-02-22 | Procédé et dispositif pour réduire les vibrations dans les machines à papier |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1746204B1 (fr) |
AT (1) | ATE398704T1 (fr) |
DE (2) | DE102005022874A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006031022A1 (de) * | 2006-07-05 | 2008-01-10 | Voith Patent Gmbh | Schwingungsdämpfung |
DE102007022241A1 (de) * | 2007-05-09 | 2008-11-27 | Voith Patent Gmbh | Verfahren und Vorrichtung zur Kompensation von periodischen Momentschwankungen |
DE102007041931A1 (de) * | 2007-09-04 | 2009-03-05 | Voith Patent Gmbh | Walzenanordnung |
DE102007055850A1 (de) * | 2007-12-18 | 2009-06-25 | Voith Patent Gmbh | Verfahren sowie eine Vorrichtung zur Unterdrückung von Schwingungen und/oder Variationen in einer Papiermaschine |
DE102008040174C5 (de) * | 2008-07-04 | 2013-05-23 | Koenig & Bauer Aktiengesellschaft | Verfahren zum Betrieb einer Maschine mit zumindest einem rotierenden Bauteil |
DE102010041615A1 (de) * | 2010-09-29 | 2012-03-29 | Voith Patent Gmbh | Verfahren zum Betreiben eines Kalanders |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5768985A (en) * | 1995-12-11 | 1998-06-23 | Valmet Corporation | Method for preventing vibrations of a roll set |
US5961899A (en) * | 1997-07-15 | 1999-10-05 | Lord Corporation | Vibration control apparatus and method for calender rolls and the like |
-
2005
- 2005-05-18 DE DE102005022874A patent/DE102005022874A1/de not_active Withdrawn
-
2006
- 2006-02-22 EP EP06110274A patent/EP1746204B1/fr not_active Not-in-force
- 2006-02-22 DE DE502006000937T patent/DE502006000937D1/de active Active
- 2006-02-22 AT AT06110274T patent/ATE398704T1/de active
Also Published As
Publication number | Publication date |
---|---|
EP1746204A3 (fr) | 2007-06-27 |
DE502006000937D1 (de) | 2008-07-31 |
DE102005022874A1 (de) | 2006-11-23 |
EP1746204A2 (fr) | 2007-01-24 |
ATE398704T1 (de) | 2008-07-15 |
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