WO2010094834A1 - Agencement pour amortissement de vibration dans une machine à toile fibreuse - Google Patents

Agencement pour amortissement de vibration dans une machine à toile fibreuse Download PDF

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Publication number
WO2010094834A1
WO2010094834A1 PCT/FI2010/050087 FI2010050087W WO2010094834A1 WO 2010094834 A1 WO2010094834 A1 WO 2010094834A1 FI 2010050087 W FI2010050087 W FI 2010050087W WO 2010094834 A1 WO2010094834 A1 WO 2010094834A1
Authority
WO
WIPO (PCT)
Prior art keywords
rolls
arrangement
roll
shafts
arrangement according
Prior art date
Application number
PCT/FI2010/050087
Other languages
English (en)
Inventor
Tommi Korolainen
Seppo Kupiainen
Arto Puranen
Original Assignee
Metso Paper, Inc.
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
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to EP10743442A priority Critical patent/EP2398961A4/fr
Publication of WO2010094834A1 publication Critical patent/WO2010094834A1/fr

Links

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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems

Definitions

  • the invention relates to an arrangement for dampening vibration in a fiber web machine, including two rolls adapted in a nip contact with the shafts thereof being supported with support means, and with the arrangement including force elements adapted to influence a shaft at a distance from the support means for dampening roll vibration.
  • pairs of rolls adapted in a nip contact are used for processing the fiber web.
  • Such roll pairs exist at the press, size press and reel, for example. Vibration often occur in the roll pairs causing crushing in the fiber web, clothing and/or roll cover. Crushing restricts the operating speed of a fiber web machine as well as reduces the service life of clothing and a roll cover. The quality of the end product also decreases. Crushing of the end product is concerned when variation of gloss or opacity or other inhomogenei- ty is visually detectable in the end product.
  • a roll pair composed of a deflection-compensated roll and a coated counter roll set in a nip contact is sensitive to vibrations. Vibrations are caused, for example, by roll inaccuracies, deforming of the roll cover during use, and thickness variations in the fiber web or clothing traveling via the nip. Prolonged vibration further intensifies deformation, particularly that of the cover and the clothing, causing self-excited vibration. As regards crushing, the worst form of vibration is such in which the rolls vibrate in opposite phases in the nip direction. Then the deformation of the fiber web, roll cover and the clothing is the strongest. At the same time, the mechanical stress subjected to the roll pair increases and noise problems also appear.
  • EP patent No. 1333122 discloses an arrangement for dampening vibrations of a roll pair. It is proposed that dampening is provided by subjecting the static shaft of one of the rolls to a force that is in the opposite phase relative to the movement of this shaft by means of a force element. The force is applied to a distance from the support means of the roll.
  • the effects of the proposed arrangement are, however, insufficient for most roll pairs. That is, the dampening effect is low.
  • extra stresses are caused to the roll pair and its environment by the force.
  • the adjustment and use of the arrangement are also difficult.
  • the object of the invention is to provide a novel arrangement in a fiber web machine for dampening vibration, the arrangement being simpler in design than previously but more versatile and efficient than before for its operation.
  • the characteristic features of this invention are that force elements are arranged between the shafts of the opposite rolls or between the shaft of the first roll and the support means of the second roll.
  • roll pairs are connected together as a functional entity, the vibrations of which can be efficiently dampened without causing extra stresses to surrounding constructions.
  • the assembly of the arrangement can be formed of various components according to the specific dampening requirement. Further- more, various functions can be included in the arrangement to be able to prevent problems in advance or at least mitigate their effects.
  • Figure Ia shows a first embodiment of an arrangement according to the invention
  • Figure Ib is a principle diagram showing deformations and forces caused by the vibrations of an arrangement according to the invention without dampening
  • Figure Ic shows forces opposite to those of Figure Ib without dampening
  • Figure 2a shows a second embodiment of an arrangement according to the invention
  • Figure 2b shows a third embodiment of an arrangement according to the invention.
  • Figure Ia shows an arrangement according to the invention seen in the machine direction.
  • the arrangement is meant for dampening vibrations in a fiber web machine.
  • Fiber web machines include paper and board machines, for example.
  • two rolls 10 and 11, adapted in a nip contact relative to each other, are examined.
  • a fiber web that is led through the thus forming nip deforms due to the effect of the nip load (not shown) .
  • the press for example, one or even two fabrics travel through the nip.
  • a soft calender for example, only one fiber web travels through the nip.
  • the top roll 11 is a thermoroll, for example, and the bottom roll 10 is a deflection-compensated roll.
  • the shafts 12 and 13 of both rolls 10 and 11 are supported with support means 14 and 15. The construction of the support means is described in more detail later.
  • the arrangement includes force elements 16 that are adapted to influence the shaft 12 at a distance from the support means 14 for dampening vibrations of the rolls 10 and 11.
  • the force elements 16 are arranged between the shafts 12 and 13 of the opposite rolls 10 and 11 or between the shaft 12 of the first roll 10 and the support means 15 of the second roll 11. Regardless of the embodiment, the force element thus joins the rolls as a functional entity, the vibration of which can be dampened better than before. In addition, the use and adjustment of the force element are easier and more accurate than previously.
  • the force element can also be locate'd more freely than before and its construction can be selected from several alternatives.
  • the force element is connected to the shaft or the support means with any suitable method. Advantageously, clearance-free links and rigid support arms are used.
  • the force elements are arranged as passive damping elements. That is, the damping elements resist the movement of the shaft/shafts dampening in this way their vibration and reducing thus the amplitude of vibration.
  • the nip vibration dampens at the same time. Most commonly the two rolls are adapted vertically on top of each other. That is, the shafts are located in a vertical line. In this case the so called nip vibration causes deflection of the shafts in such a way that as the center parts of the shafts 12 and 13 separate from each other, the ends of the shafts 12 and 13 approach each other. The principle of this is illustrated in Figure Ib.
  • FIG. Ic An opposite movement is seen in Figure Ic showing that as the center parts of the shafts 12 and 13 approach each other, the ends of the shafts 12 and 13 separate from each other.
  • Figures Ib and Ic show the principles of the support points relative to which the shafts 10 and 11 bend.
  • An advantageous location for the damping element is particularly at the shaft ends whereby the portion of the free end of both shafts creates a lever arm relative to the turning point of the support means.
  • efficient dampening is achieved since the shaft ends move a maximum distance to the opposite directions.
  • the damping element is subjected to the movements of both shafts which can be simultaneously dampened.
  • both rolls 10 and 11 are provided with static shafts 12 and 13 around which a roll shell 17 and 18 is mounted with bearings.
  • the force resisting the shaft movement is, for example, friction or shearing force of an elastic material.
  • the kinetic energy converts mainly to heat.
  • the resistance of the damping element can be adjustable.
  • the damping element according to the invention works well particularly toward nip vibration because the shaft ends then move in the opposite phases as well. Then the relative movement is the greatest at the damping element. In practice, the greater this relative movement is, the better the damping element functions.
  • damping elements include a hydraulic shock absorber, a mag- neto-rheological hydraulic or elastomeric damper, a friction damper, a viscoelastic damper or a squeeze film damper.
  • semi-active damping elements can be used for changing periodically the natural frequency of a roll system composed of rolls.
  • the above listed damping elements can be used semi-actively as well.
  • the damping element is used to change the natural frequency of the arrangement whereby the self-excited vibration dampens or its generation is completely prevented.
  • the rigidity of a semi-active damping element is varied whereby the natural frequency of the whole arrangement changes, which stops the development of self-excited vibration.
  • the use of the same oper ⁇ ating parameters causes crushing, the elimination of which has been attempted by changing the operating speed or the nip load, for example.
  • changes in the operating parameters affect significantly the production itself, which further brings new problems.
  • a semi-active damping element allows changing the natural frequency without changing the operating parameters.
  • the damping element changes the rigidity of the arrangement, which then influences the natural frequency.
  • the changing interval of the natural frequency is determined specifically for each case and the change is performed according to a programmed schedule or when required. For example, when nip vibrations appear, the natural frequency of the arrangement is first changed to avoid problems . In case nip vibration continues in spite of the change, other measures are taken for dampening the vibration.
  • One repair alternative is to recondition or renew the roll cover.
  • a third method according to the invention to dampen vibrations is to use active damping elements.
  • active damping elements In practice this means actuators that actively resist the movement of the shafts for dampening their vibrations. The resisting force is applied to the shafts in phases that are opposite relative to the shaft movements.
  • An active damping element thus provides force variation at the frequency of harmful nip vibration but in the opposite phase. Then the force variation resists harmful vibration and reduces it.
  • An active damping element may also have passive and/or semi-active functions in which case suitable dampening can be provided for each condition. Especially an active damping element requires continuous control, which is based on the actual vibrations of the arrangement.
  • Figure Ia shows the principle of a control system 19 having sensor assemblies 20 in the roll 11, the shaft 13, and the bearing assembly 22.
  • the force element 16 is then controlled based on vibrations detected by the sensor assembly.
  • a corresponding sensor assem- bly is provided in the other roll as well (not shown) .
  • the location and the number of sensors can vary.
  • the control system can be independent or it is a part of the machine control system.
  • a corresponding control system can be used with passive and semi-active damping elements as well.
  • an active damping element is any actuator, the movement of which is advantageously linear.
  • FIG. 2b shows an arrangement in which the shafts 12 and 13 of
  • both rolls 10 and 11 are static and the shafts 12 and 13 are provided with roll shells 17 and 18 mounted with bearings.
  • the support means of the rolls 10 and 11 are bearing assemblies 21 and 22 that are arranged rigidly in contact with each other. Then the bearing assemblies 21 and 22 allow bending
  • a rigid mutual connection of the bearing assemblies contributes to the dampening according to the invention and reduces vibrations of the arrangement.
  • the arrangement is an integral whole which is independent of the rigidity of surrounding constructions.
  • a pivoting mechanism 23 permitting the movements of the shafts 12 and 13 can also be arranged between the support means 14 and
  • the bottom roll 10 is a deflection-compensated roll provided with a static shaft 12 and a roll shell 17 mounted with bearings on the shaft.
  • an auxiliary bearing assembly 24 is arranged for the shaft 13 that is adapted to rotate, for connecting a force element 16.
  • the auxiliary bearing assembly 24 allows the rotation of the shaft 13 while simultaneously con-
  • inventions of Figures Ia and 2a are dimensioned specifi- 5 cally for the dampening according to the invention. That is, the shafts are unnecessarily long.
  • An arrangement according to the invention can also be provided in existing roll pairs.
  • the arrangement includes two overhanging shafts 25 adapted as an extension for both shafts 10 12 and 13.
  • the overhanging shaft would be an extension for one shaft only.
  • a one-sided force element installation may be necessary to use in such conditions, for example, where the roll drive equipment is located immediately as an extension to the shafts.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention porte sur un agencement pour amortir une vibration dans une machine à toile fibreuse, l'agencement comprenant deux rouleaux (10, 11) adaptés dans un contact de pincement. Les arbres (12, 13) des rouleaux (10, 11) sont supportés par des moyens de support (14, 15). L'agencement comprend des éléments de force (16) aptes à influencer l'arbre (12) à une distance des moyens de support (14) pour amortir des vibrations des rouleaux (10, 11). Les éléments de force (16) sont disposés entre les arbres (12, 13) des rouleaux opposés (10, 11) ou entre l'arbre (12) du premier rouleau (10) et les moyens de support (15) du second rouleau (11).
PCT/FI2010/050087 2009-02-20 2010-02-11 Agencement pour amortissement de vibration dans une machine à toile fibreuse WO2010094834A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10743442A EP2398961A4 (fr) 2009-02-20 2010-02-11 Agencement pour amortissement de vibration dans une machine à toile fibreuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20095165A FI121276B (fi) 2009-02-20 2009-02-20 Järjestely värähtelyn vaimentamiseksi kuiturainakoneessa
FI20095165 2009-02-20

Publications (1)

Publication Number Publication Date
WO2010094834A1 true WO2010094834A1 (fr) 2010-08-26

Family

ID=40404665

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2010/050087 WO2010094834A1 (fr) 2009-02-20 2010-02-11 Agencement pour amortissement de vibration dans une machine à toile fibreuse

Country Status (3)

Country Link
EP (1) EP2398961A4 (fr)
FI (1) FI121276B (fr)
WO (1) WO2010094834A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104476825A (zh) * 2014-12-15 2015-04-01 吴兆广 一种压花或压光装置
CN104963990A (zh) * 2015-06-09 2015-10-07 郭斌 一种阻尼连接器
EP3614006A1 (fr) * 2018-08-23 2020-02-26 Voith Patent GmbH Machine de fabrication ou de traitement d'une matière fibreuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997027953A1 (fr) 1996-01-31 1997-08-07 Aluminum Company Of America Interruption du flottement des rouleaux d'un laminoir par vibrations induites
US5961899A (en) * 1997-07-15 1999-10-05 Lord Corporation Vibration control apparatus and method for calender rolls and the like
EP1333123A1 (fr) 2002-02-05 2003-08-06 Eduard Küsters Maschinenfabrik GmbH & Co. KG Procédé et dispositif d'amortissement actif dans un dispositif de traitement d'une bande en mouvement continu
EP1371776A2 (fr) 2002-05-16 2003-12-17 Voith Paper Patent GmbH Calandre et procédé pour le fonctionnement d' un calandre

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997027953A1 (fr) 1996-01-31 1997-08-07 Aluminum Company Of America Interruption du flottement des rouleaux d'un laminoir par vibrations induites
US5724846A (en) * 1996-01-31 1998-03-10 Aluminum Company Of America Interruption of rolling mill chatter by induced vibrations
US5961899A (en) * 1997-07-15 1999-10-05 Lord Corporation Vibration control apparatus and method for calender rolls and the like
EP1333123A1 (fr) 2002-02-05 2003-08-06 Eduard Küsters Maschinenfabrik GmbH & Co. KG Procédé et dispositif d'amortissement actif dans un dispositif de traitement d'une bande en mouvement continu
EP1333123B1 (fr) * 2002-02-05 2005-10-19 Eduard Küsters Maschinenfabrik GmbH & Co. KG Procédé et dispositif d'amortissement actif dans un dispositif de traitement d'une bande en mouvement continu
EP1371776A2 (fr) 2002-05-16 2003-12-17 Voith Paper Patent GmbH Calandre et procédé pour le fonctionnement d' un calandre
EP1371776B1 (fr) * 2002-05-16 2006-12-13 Voith Patent GmbH Calandre et procédé pour le fonctionnement d' un calandre

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200370, Derwent World Patents Index; AN 2003-732975, XP003026477 *
See also references of EP2398961A4 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104476825A (zh) * 2014-12-15 2015-04-01 吴兆广 一种压花或压光装置
CN104963990A (zh) * 2015-06-09 2015-10-07 郭斌 一种阻尼连接器
EP3614006A1 (fr) * 2018-08-23 2020-02-26 Voith Patent GmbH Machine de fabrication ou de traitement d'une matière fibreuse
CN110857539A (zh) * 2018-08-23 2020-03-03 福伊特专利有限公司 用于制造或处理纤维的机器

Also Published As

Publication number Publication date
FI20095165A0 (fi) 2009-02-20
FI121276B (fi) 2010-09-15
FI20095165A (fi) 2010-08-21
EP2398961A1 (fr) 2011-12-28
EP2398961A4 (fr) 2012-08-01

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