EP0607584B1 - Procédé et dispositif pour améliorer le fonctionnement des presses humides - Google Patents

Procédé et dispositif pour améliorer le fonctionnement des presses humides Download PDF

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Publication number
EP0607584B1
EP0607584B1 EP93120392A EP93120392A EP0607584B1 EP 0607584 B1 EP0607584 B1 EP 0607584B1 EP 93120392 A EP93120392 A EP 93120392A EP 93120392 A EP93120392 A EP 93120392A EP 0607584 B1 EP0607584 B1 EP 0607584B1
Authority
EP
European Patent Office
Prior art keywords
felt
path
carrier
movement
blanket
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.)
Expired - Lifetime
Application number
EP93120392A
Other languages
German (de)
English (en)
Other versions
EP0607584A1 (fr
Inventor
Andreas Meschenmoser
Wolf-Gunter Stotz
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 Sulzer Papiermaschinen GmbH
Original Assignee
Voith Sulzer Papiermaschinen 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
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0607584A1 publication Critical patent/EP0607584A1/fr
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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/005—Wire-tensioning devices

Definitions

  • the invention relates to a method and a device for improving the working behavior of wet presses in the treatment of fibrous webs, in particular within a paper machine.
  • EP 0 334 201 and DE-PS 37 19 828 propose a device in which a periodic change in the length of the felt path is achieved by the reciprocating movement of a roller end of a felt tensioning roller. Since this is preferably done in the direction of the bisector of the felt wrap angle or parallel to the plane of the incoming felt belt, the felt belt can run laterally, so that the felt control must be activated in the opposite direction. For this reason, it is proposed in DE-OS 40 11 796 to pivot the roller approximately perpendicular to the plane of the incoming felt belt. This creates tension in the felt, which is intended to prevent the markings mentioned.
  • the swivel angle is changed step by step according to a fixed time program or depending on the vibration intensity of the rollers to be recorded.
  • a disadvantage of the control via the vibration measurement is that, as soon as the vibrations occur, it can usually be too late to remedy the situation.
  • the timing offers no guarantee that the felt will not remain in one condition for too long due to its inertia and thereby be damaged.
  • important points such as the type of felt, the aging and soiling of the felt and the machine speed are not taken into account, which limits the efficiency of the vibration prevention.
  • the invention is therefore based on the object of a method and an apparatus for To improve the working behavior of wet presses, which avoid the above disadvantages and thus reduce the vibrations more effectively and extend the felt run times.
  • the degree of parallelogram-like tensioning of the felt that occurs is detected by suitable sensors and influences the control of the change in the path of the felt, regardless of how quickly the felt adjusts to a change in path, more effectively reducing markings in the felt and the resulting vibrations.
  • the consequence of this is a substantial extension of the felt run times.
  • the felt path on one outer edge can be gradually lengthened or shortened with respect to the other.
  • a roller with a large felt wrap angle is suitable, in particular a felt tensioning roller, the roller shell of which is rotatably mounted on a likewise rotatably mounted carrier, the roller shell being supported eccentrically at least at one end with respect to the carrier axis, so that the felt path of travel on the side of the eccentric bearing can be changed by rotating the carrier.
  • the carrier is coupled to a gear motor unit, which is controlled by a control with the degree of Felt tension sensing sensors is connected. It is of course also possible to use or adapt the device described in EP 334 201 or DE-PS 37 19 828 to implement the method.
  • the roll shell is mounted eccentrically at both ends and the maximum deviation from the carrier axis is present at the ends of the roll shell in the opposite direction.
  • Light or color-sensitive sensors are particularly suitable for detecting the degree of tension, one of which is attached to each edge of the felt and recognizes the colored markings of the felt there.
  • electro-magnetic sensors on both edges, which are used to identify markings in the form of metal threads, which are preferably woven into the felt at right angles to the machine direction.
  • the measuring principle is based on the fact that the bracing also changes the relative position of the above. Indications to each other has the consequence that can be detected by the sensors and thus provides information about the degree of tension.
  • the felt tensioning roller 1 consists of a roller shell 2, which is rotatably arranged around a carrier 3 and is eccentrically supported on both ends thereof.
  • the maximum deviation from the carrier axis 4 is in relation to the both ends on opposite sides of the carrier 3.
  • the carrier 3 is also rotatably mounted in the frame 5 and connected at one end to a gear motor unit 6.
  • the speed and possibly also the direction of rotation of the gear-motor unit are influenced by a controller 14 which is connected to sensors 12 arranged on both edges of the felt and detecting the degree of felt tension.
  • Suitable sensors 12 are light- or color-sensitive sensors 12 for recognizing colored markings 13 of the felt 11 as well as electro-magnetic ones for recognizing dirt-insensitive markings 13 in the form of metal threads woven into the felt 11.
  • the relative shift of the markings 13 is a measure of the degree of bracing.
  • FIG. 2 shows the arrangement of such a roller in a wet press section of a paper machine.
  • guide and deflection rollers 9 and the felt tensioning roller 1 are shown.
  • the paper web 10 and an endless felt 11 rotating over the guide and deflection rollers 9 and the felt tensioning roller 1 are guided through the press nip.
  • the felt 11 partially surrounds the felt tensioning roller 1, so that when the carrier 3 rotates, the felt path of travel changes due to the eccentric bearing of the roller shell 2 (with a constant mean felt tension value), measured on the outer edges of the felt 11. If you want to prevent the markings of the felt 11 and the resulting vibrations of the wet press, it is necessary to change the parallelogram-shaped tension of the felt 11 preferably continuously.
  • the device allows several control variants, on the one hand the path length of the felt path to be extended or shortened can be determined by specifying the maximum angle of rotation of the carrier 3, on the other hand it is also possible to change the path of the felt continuously or step by step until the maximum desired tensioning of the Felt 11, ie a predetermined offset of the markings 13 with respect to the two edges of the felt 11 is set. For entering setpoints or similar input E can be used.

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  • Paper (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (6)

  1. Procédé d'amélioration du travail de presses par voie humide avec un feutre (11) sans fin, tournant, guidé par des dispositifs de guidage ou de renvoi ainsi que conjointement avec une bande de matière fibreuse à déshydrater, à travers une fente de pressage formée par une paire de rouleaux (7, 8), le parcours du feutre étant allongé et raccourci sur un bord extérieur du feutre (11) par rapport à l'autre, caractérisé en ce que le degré de la tension en parallélogramme du feutre (11) est détecté par des capteurs (12) et en ce qu'on influence la commande de la variation du parcours du feutre de manière que lorsqu'est atteinte une tension maximale voulue du feutre (11), il se produise une commutation entre l'allongement et le raccourcissement du parcours du feutre et l'allongement ou le raccourcissement du parcours du feutre s'effectue en ce qu'une vitesse déterminée de la variation de la tension du feutre (11) est respectée.
  2. Procédé selon la revendication 1, caractérisé en ce que le parcours du feutre est allongé ou raccourci progressivement, sur un bord extérieur, par rapport à l'autre.
  3. Dispositif d'amélioration du travail de presses par voie humide comportant un rouleau de tension de feutre (1), qui est entouré partiellement par un feutre (11) sans fin, tournant, qui est guidé par des rouleaux de guidage ou des rouleaux de renvoi (9), ainsi que conjointement avec une bande de matière fibreuse à déshydrater, à travers une fente de pressage, formée par une paire de rouleaux (7, 8), et est constitué d'une enveloppe de rouleau (2) placée sur un support et montée tournante sur ce support (3), caractérisé en ce que le support (3) est monté tournant et est accouplé à une unité moteur-transmission (6), le supportage de l'enveloppe de rouleau (2) s'effectue de manière excentrée au moins à une extrémité par rapport à l'axe (4) du support, et en ce que l'unité moteur-transmission (6) est reliée, par une commande (14), à des capteurs (12) détectant le degré de tension du feutre.
  4. Dispositif selon la revendication 3, caractérisé en ce que l'enveloppe de rouleau (2) est montée excentrée aux deux extrémités par rapport à l'axe (4) du support et l'écart maximal par rapport à l'axe (4) du support se trouve aux extrémités de l'enveloppe de rouleau (2) en sens opposé.
  5. Dispositif selon la revendication 3 ou 4, caractérisé en ce que face à chaque bord du feutre (11) est prévu un capteur (12) sensible à la lumière ou à la couleur en vue de la détection de repère coloré (13) du feutre (11).
  6. Dispositif selon l'une des revendications 3 à 5, caractérisé en ce que le feutre (11) porte des repères (13) sous la forme de fils métalliques tissés transversalement au sens de la machine et face à chaque bord du feutre (11) se trouve un capteur électromagnétique (12).
EP93120392A 1993-01-22 1993-12-17 Procédé et dispositif pour améliorer le fonctionnement des presses humides Expired - Lifetime EP0607584B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301651A DE4301651C1 (de) 1993-01-22 1993-01-22 Verfahren und Vorrichtung zur Verbesserung des Arbeitsverhaltens von Naßpressen
DE4301651 1993-01-22

Publications (2)

Publication Number Publication Date
EP0607584A1 EP0607584A1 (fr) 1994-07-27
EP0607584B1 true EP0607584B1 (fr) 1997-07-30

Family

ID=6478700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120392A Expired - Lifetime EP0607584B1 (fr) 1993-01-22 1993-12-17 Procédé et dispositif pour améliorer le fonctionnement des presses humides

Country Status (3)

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EP (1) EP0607584B1 (fr)
AT (1) ATE156206T1 (fr)
DE (2) DE4301651C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5643416A (en) * 1996-06-07 1997-07-01 Beloit Technologies, Inc. Extended nip press with oscillating blanket for extended wear
DE19851593A1 (de) * 1998-11-09 2000-05-11 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zur Behandlung einer Materialbahn
DE102006024032A1 (de) * 2006-05-23 2007-11-29 Voith Patent Gmbh Anordnung zur Bandregelung
DE102011006134A1 (de) * 2011-03-25 2012-09-27 Voith Patent Gmbh Verfahren zum Betreiben einer Bespannung
DE102011006136A1 (de) * 2011-03-25 2012-09-27 Voith Patent Gmbh Vorrichtung und Verfahren zur Regelung einer Bespannung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540923B2 (de) * 1975-09-13 1978-01-12 EMA-Dörries GmbH, Elektronik-Maschinen-Apparatebau, 5190 Stolberg Vorrichtung zur regelung der spannung eines endlosen filzes oder siebes in papiermaschinen
DE3719828A1 (de) * 1987-06-13 1988-12-22 Kuesters Eduard Maschf Nasspresse
DE3809526A1 (de) * 1988-03-22 1989-10-12 Aigster Josef Verfahren und anordnung zum verbessern des arbeitsverhaltens der nasspresse einer papiermaschine
DE4011796C2 (de) * 1990-04-12 1994-04-21 Voith Gmbh J M Vorrichtung zum Führen eines endlosen Filzbandes

Also Published As

Publication number Publication date
DE59307020D1 (de) 1997-09-04
EP0607584A1 (fr) 1994-07-27
DE4301651C1 (de) 1993-12-16
ATE156206T1 (de) 1997-08-15

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