WO2004067837A1 - Dispositif de formage - Google Patents

Dispositif de formage Download PDF

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Publication number
WO2004067837A1
WO2004067837A1 PCT/EP2004/050020 EP2004050020W WO2004067837A1 WO 2004067837 A1 WO2004067837 A1 WO 2004067837A1 EP 2004050020 W EP2004050020 W EP 2004050020W WO 2004067837 A1 WO2004067837 A1 WO 2004067837A1
Authority
WO
WIPO (PCT)
Prior art keywords
former
upper lip
pressure
sieve
screen
Prior art date
Application number
PCT/EP2004/050020
Other languages
German (de)
English (en)
Inventor
Stefan Lehner-Dittenberger
Robert Hutterer
Karl Grubner
Original Assignee
Voith Paper 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
Application filed by Voith Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Priority to EP04702710A priority Critical patent/EP1590529A1/fr
Publication of WO2004067837A1 publication Critical patent/WO2004067837A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/04—Head boxes of cylinder machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines

Definitions

  • the invention relates to a former with a sieve, which is preferably designed as a circular sieve, an inlet gap for a fiber suspension flowing within a chamber and an adjustable outlet gap for the fiber suspension flowing out of the chamber being formed between the sieve and an upper lip formed by a flow guide wall, the upper lip being adjustable by means of a pressure medium both in the direction of the screen and in the opposite direction.
  • Such a former is known from the applicant's European patent application EP 0 889 162 A2 (PB10561 EPK), which is sold by the applicant under the name "FloatLip former".
  • PB10561 EPK European patent application
  • a sheet formation zone is formed, in which the fibrous suspension enters under pressure from a machine-wide chamber into a machine-wide gap between a circular screen and a flow guide wall.
  • the beginning of the gap is defined between a lower lip and an upper lip, while at the end of the gap an outlet gap is defined between the screen and the upper lip.
  • the upper lip is adjustable with the aid of two pressure hoses each loaded with a pressure medium, both in the direction of the screen and in the opposite direction.
  • the invention is therefore based on the object of providing an improved former which does not have the aforementioned disadvantages.
  • this object is achieved in a former according to the type mentioned at the outset in that the upper lip can be shifted sectionally in the direction of the screen and against the direction of the screen by means of a plurality of adjusting elements, in particular adjusting screws, attached to the stiffening element over its width ,
  • the inlet and outlet gap can be adjusted to different operating situations even during the operation of the former.
  • a compensation of mechanical and / or thermal imperfections such as, for example, deviation of the cylinder from its ideal geometry, deformations of the lip in the inlet or outlet area, partial compensation of thermal influences and the like, is easily possible.
  • Another important advantage is the ability to adjust the upper lip across its width across the width using the adjusting screws for parallel alignment, i.e. constant gap, to the cylinder or round screen and in the inlet area across its width using the adjusting screws for parallel alignment , ie constant gap, to be able to adjust to the cylinder or the rotary screen, preferably already during the factory assembly.
  • a carrier is provided, on the first side facing the sieve with a spacer plate to the stiffening element a first pocket for receiving the second pressure hose is formed, and on the second side facing away from the sieve with preferably several pressure plates , which are movably connected to the stiffening element via several linkages with adjusting screws and via a linkage preferably provided with several adjusting screws, a second pocket for receiving the first pressure hose is formed.
  • This design supports the rigid lip, which itself is not sufficiently rigid, and ensures a defined position of the pressure hoses in a simple manner in order to guide the upper lip in a defined manner by the differential forces between the two pressure hoses.
  • the adjusting screws per pressure plate are provided for the individual adjustment of the pressure plate and for the sectional adjustment of the inlet gap via the linkage, the stiffening element and the upper lip.
  • the adjusting screws are provided with stops which act on both sides of the support. This configuration prevents damage to the sensitive sieve in phases in which there is still no dewatering pressure in the inlet gap, that is to say during standstill and when starting up.
  • the stiffening element distributed over the width of the former consists of a plurality of stiffening ribs, each of which is assigned a pivot bearing for support on the carrier.
  • the high number of support points results in a quasi-linear support and thus largely over the entire machine width straight and deflection-free course of the upper lip in the area of the outlet gap.
  • At least one preferably inductive displacement transducer is provided for determining the position of the upper lip in the area of the inlet gap.
  • heating elements in particular heating pockets, are provided according to the invention, which can be temperature-controlled by means of a controller during the operation of the former.
  • the heating elements can advantageously be controlled / regulated in such a way that the carrier has the same or approximately the same temperature as the fiber suspension.
  • the former can thus be adapted to different influences or operating parameters, such as changing fiber material temperatures, changing ambient temperatures, start-up cycles and the like.
  • the upper lip is guided in a floating manner in the area of the inlet gap with the aid of at least two pressure hoses, a first of the two pressure hoses exerting a force exerted on the upper lip to adjust the same in the direction of the screen when pressurized with pressure medium a second of the two pressure hoses, when pressurized with pressure medium, exerts an opposite force to adjust it against the direction of the screen, and that the upper lip in the area of the outlet gap with the help of at least one
  • the pivot bearing is mounted in such a way that when the inlet gap changes, the outlet gap remains constant or approximately constant.
  • a defined position of the upper lip in relation to the sieve is achieved by the pressure on the upper lip in the area of the inlet gap both in the direction of the screen and in the opposite direction by means of the pressure medium and the storage of the upper lip in the area of the outlet gap.
  • This results in a kind of floating support for the upper lip, which is defined both in the direction of the screen and in the opposite direction.
  • a particularly sensitive and precisely defined guidance of the upper lip for setting the inlet gap and the drainage pressure can be achieved.
  • the formation of a differential force between the effect of the pressure medium in the direction of the screen and the effect of the pressure medium in the opposite direction results in a particularly sensitive and precisely defined dosing option for the dewatering pressure.
  • the drainage pressure can be kept constant regardless of the degree of grinding and non-roundness of the sieve can be compensated.
  • the two pressure hoses preferably extend parallel to the web running direction in the axial direction of the former.
  • other geometrical arrangements of the pressure hoses are also conceivable.
  • it is conceivable to use other pressure media to determine the position of the upper lip i.e. to arrange fluid sleeves along the upper lip acting both in the direction of the screen and in the opposite direction, or, if necessary, double-acting hydraulic cylinders or other elastic elements, such as such as spring elements to use.
  • the pivot bearing has at least one pivot axis which lies on or approximately on a theoretical extension of a connecting axis between the center of the screen cylinder and the outlet gap edge of the upper lip.
  • the result of this geometry is that the outlet gap remains constant even when the adjustment range for the inlet gap is fully utilized, for example from 5 to 15 mm.
  • the precisely defined pivot axis results in low friction in the area of the gap adjustment.
  • the pivot bearing can be displaced in the direction of the screen and counter to the direction of the screen by means of adjusting screws which are attached on both sides. These two adjusting screws enable the upper lip to be adjusted quickly to and from the sieve when the outlet gap is changed with any repetition and with high repeat accuracy.
  • the swivel bearing can be displaced in the direction of the screen and counter to the direction of the screen by means of a plurality of adjusting screws which are attached and adjustable over its width. This also creates a sectional setting option for the outlet gap, which is characterized, among other things, by high precision and a wide range of settings.
  • each adjustment screw attached on both sides, in particular each adjusting screw is provided with an indication of the size of the outlet gap.
  • This display can be of optical or be electrical in nature, the second type of display being suitable for automated open-loop or closed-loop evaluation.
  • the upper lip is fastened to a stiffening element which is guided at its end in the area of the inlet gap by means of the two pressure hoses and is pivotally attached to the pivot bearing at its end in the area of the outlet gap.
  • one of the two pressure hoses preferably the second pressure hose
  • the other of the two pressure hoses is subjected to an adjustable working pressure. In this way, the control of the two pressure hoses is simplified.
  • the former advantageously has a lower lip which is provided with a sealing lip at its end facing the sieve.
  • a plurality of material supply lines distributed across the width are provided for feeding fiber suspension into the chamber, which preferably lead to inserts.
  • a transverse distribution pipe is provided for the admixture of dilution liquid into the inserts Beam is rigidly connected via struts.
  • the cross-distribution pipe which is necessary anyway, is also used to stiffen the beam.
  • the utilization of the thermal expansion when the supplied liquid is tempered has a particularly advantageous effect in order to keep the carrier largely free of deflection without additional support measures.
  • the inserts are preferably arranged in one row or arranged in several rows and / or interchangeable.
  • a system for changing the material densities in the individual material supply lines comprises, for example, at least one centrifugal distributor with lines delivering fiber suspension, the number of outgoing lines of the centrifugal distributor preferably not being equal to the number of material supply lines of the former.
  • the single figure shows a section through an embodiment of a former according to the invention in the region of the adjusting device with an upper lip that can be adjusted to the screen.
  • a former according to the invention is generally designated by the number 10.
  • the former 10 comprises a forming roll, of which only the screen 12 is shown in the area of the sheet formation zone.
  • a fiber suspension 18 emerges from a chamber 16, which is also referred to as a mixing chamber, via an inlet gap 14, which is formed between a lower lip 20 and an upper lip 22, into a gap 24 between the screen 12 and the upper lip 22, the upper lip End defines an outlet gap 26.
  • the upper lip 22 can be shifted sectionally in the direction of the screen 12 and against the direction of the screen 12 by means of a plurality of adjustment elements 52, in particular adjustment screws, attached to a stiffening element 32 across its width.
  • a carrier 54 is provided, on the first side of which faces the screen 12 with a spacer plate 56 to the stiffening element 32, a first pocket 58 for receiving a second pressure hose 36 is formed, and on the second side thereof facing away from the screen 12 with a plurality of pressure plates 60 , which are movably connected to the stiffening element 32 via a plurality of linkages 61 with adjusting screws 62 and via a linkage 66 preferably provided with a plurality of adjusting screws 64, a second pocket 68 for receiving a first pressure hose 36 is formed.
  • At least two linkages 61 with adjusting screws 62 per pressure plate 60 are provided for the individual adjustment of the pressure plate 60 and for the sectional adjustment of the inlet gap 14 via the linkage 61, 66, the stiffening element 32 and the upper lip 22.
  • the adjusting screws 62, 64 are provided with stops 70, which preferably act on both sides of the carrier 54, in order to limit a feed movement of the upper lip 22 in the direction of the screen 12 and in the opposite direction to the screen 12.
  • the stiffening element 32 has a plurality of stiffening ribs 32 distributed over the width of the former, each of which is assigned a pivot bearing 38 for support on the carrier 54.
  • the stiffening ribs 32 are preferably arranged at uniform intervals over the entire machine width. The high number of pivot bearings 38 and the associated stiffening ribs thus result in a quasi-linear support instead of the previously customary point-like support, which is practically free of deflection.
  • the adjusting screws 62 are provided with stops 70, which preferably act on both sides of the support 54, in order to move the upper lip 22 in the direction of the screen 12 and counter to the direction of the screen 12 to limit.
  • the stiffening element 32 is distributed over the width of the former 10 from a plurality of stiffening elements 32, each of which is associated with a pivot bearing 38 for support on the carrier 54.
  • At least one preferably inductive displacement transducer 72 is also provided for determining the position of the upper lip 22 in the area of the inlet gap 14.
  • the displacement sensor preferably detects the position of the spacer plate 56. It goes without saying that the absolute size of the inlet gap 14 is, however, also influenced by other influencing parameters, such as non-roundness of the sieve and the like. It is also a matter of course that a plurality of such displacement transducers can be provided distributed over the machine width.
  • a plurality of heating elements 74 in particular heating pockets 76, are provided which are preferably rigidly connected to the carrier 54 and which can be temperature-controlled in this way during operation of the former 10 by means of a control system.
  • the heating elements 74 can be controlled / regulated in such a way that the carrier 54 has the same or an approximately the same temperature as the fiber suspension 18.
  • the upper lip 22 is supported with the aid of a stiffening element 32 in the form of a profile in the area of the inlet gap 14 at least two pressure hoses 34, 36 are guided in a floating manner, a first 36 of the two hoses 34, 36 exerting a force exerted on the upper lip 22 to adjust it in the direction of the screen 12 when pressure medium is applied, and a second 34 of the two pressure hoses 35, 36 when pressure medium is acted upon exerts an opposite force to adjust it against the direction of the screen 12.
  • the upper lip is 22 mounted in the area of the outlet gap 26 with the aid of at least one pivot bearing 38 such that when the inlet gap 14 changes, the outlet gap 26 remains constant or approximately constant.
  • This flexible mounting also compensates for variations that result from the upper lip 22 being pivoted about the pivot bearing 38.
  • the pivot bearing 38 has a pivot axis 39 which lies on or approximately on a theoretical extension of a connecting axis between the center of the screen cylinder of the screen 12 and the exit gap edge of the upper lip 22 . Furthermore, the swivel bearing 38 (swivel axis 39) can be displaced in the direction of the screen 12 and counter to the direction on the screen 12 by means of adjustable adjusting screws 44 which are attached on both sides and, if appropriate, by means of a plurality of adjusting screws 44 which are attached and adjustable over its width.
  • outlet gap edge 27 of the upper lip 22 can be displaced in the direction of the screen 12 and against the direction of the screen 12 by means of a plurality of adjustment mechanisms 52 which are arranged across its width.
  • the upper lip 22 is fastened to the stiffening element 32 with screw connections 40, 41, 42, 43, is guided at the end in the area of the inlet gap 14 by means of the two pressure hoses 34, 36 and is pivotally attached to the pivot bearing 38 at the end in the area of the outlet gap 26 ,
  • the stiffening element 32 can consist of a rectangular holding plate.
  • One of the two pressure hoses 34, 36 preferably the first pressure hose 36, is supplied by a pressure source 50 via a control device 51 with a constant working pressure.
  • the other 34 of the two pressure hoses 34, 36 is acted upon by an adjustable working pressure from a pressure source 48 via a control device 49.
  • Air is preferably used as the pressure medium.
  • the fibrous stock suspension 18 is fed into the chamber (mixing chamber) 16 from below via numerous stock feed lines 78, which are preferably arranged next to one another across the width of the former 10, into the cross-distribution pipe 80 running in the longitudinal axis of the former 10 via valves 82 and dilution water lines 84 at a certain angle, for example at a right angle, into the lines 78, preferably into inserts 90, where dilution liquid 86 is fed in order to supply the mixing chamber 16 with fiber suspension 18 in the desired concentration in order to set the desired surface weight profile.
  • the transverse distribution pipe 80 arranged in the interior of the former 10 is rigidly connected to the carrier 54 via struts 88. Furthermore, the stock feed lines 78 preferably have interchangeable inserts 90 arranged in one or more rows.
  • a known, but not shown, system 92 is provided for changing the material densities in the individual material supply lines 78.
  • the system 92 comprises, for example, at least one known centrifugal distributor 94 with lines delivering fiber suspension 18, the number of outgoing lines of the centrifugal distributor 94 preferably equaling the number of material supply lines 78 of the former 10.

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  • Paper (AREA)

Abstract

L'invention concerne un dispositif de formage (10) comportant un tamis de préférence conçu sous forme de tamis circulaire. Une fente d'admission (14) destinée à l'admission d'une suspension de matière fibreuse (18) s'écoulant dans une chambre (16), est créée entre le tamis (12) et une lèvre supérieure (22) constituée par une paroi de guidage de courant, une fente d'écoulement réglable (26), destinée à la suspension de matière fibreuse (18) s'écoulant hors de la chambre (16), étant également créée. Ladite lèvre supérieure (22) est guidée de manière à être réglée en direction du tamis ou inversement par l'intermédiaire d'un fluide de pression. Le dispositif de formage selon l'invention est caractérisé en ce que la lèvre supérieure (22) peut être déplacée en section en direction du tamis (12) ou inversement, par l'intermédiaire d'une pluralité d'éléments de réglage (52), notamment de vis de réglage, disposés sur toute la largeur de la lèvre, sur un élément de renforcement (32).
PCT/EP2004/050020 2003-01-29 2004-01-16 Dispositif de formage WO2004067837A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04702710A EP1590529A1 (fr) 2003-01-29 2004-01-16 Dispositif de formage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003103466 DE10303466A1 (de) 2003-01-29 2003-01-29 Former
DE10303466.8 2003-01-29

Publications (1)

Publication Number Publication Date
WO2004067837A1 true WO2004067837A1 (fr) 2004-08-12

Family

ID=32797282

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/050020 WO2004067837A1 (fr) 2003-01-29 2004-01-16 Dispositif de formage

Country Status (3)

Country Link
EP (1) EP1590529A1 (fr)
DE (1) DE10303466A1 (fr)
WO (1) WO2004067837A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113529468A (zh) * 2021-07-15 2021-10-22 绵阳同成智能装备股份有限公司 一种流浆箱唇口自动调节和开度检测装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008054634A1 (de) 2008-12-15 2010-06-17 Voith Patent Gmbh Formiereinheit, insbesondere Hochkonsistenz-Blattbildungseinheit, Verwendung und Verfahren zur Steuerung der Betriebsweise einer derartigen Formiereinheit
DE102017119325B4 (de) * 2017-08-24 2022-12-29 Joh. Clouth GmbH & Co KG Dichtlippe für einen Stoffauflauf

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3125278A1 (de) * 1980-07-03 1982-06-09 J.M. Voith AG, 3100 St. Pölten Anordnung zur verstellung bzw. einstellung der blattbildungseinheit in maschinen, insbesondere rundsiebmaschinen zur erzeugung eines vlieses aus einer stoffsuspension
EP0889162A2 (fr) * 1997-07-01 1999-01-07 Voith Sulzer Papiermaschinen GmbH Section de formage
DE10135737A1 (de) * 2001-07-21 2002-02-07 Voith Paper Patent Gmbh Verteiler zum Verteilen einer Faserstoffsuspension

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3125278A1 (de) * 1980-07-03 1982-06-09 J.M. Voith AG, 3100 St. Pölten Anordnung zur verstellung bzw. einstellung der blattbildungseinheit in maschinen, insbesondere rundsiebmaschinen zur erzeugung eines vlieses aus einer stoffsuspension
EP0889162A2 (fr) * 1997-07-01 1999-01-07 Voith Sulzer Papiermaschinen GmbH Section de formage
DE10135737A1 (de) * 2001-07-21 2002-02-07 Voith Paper Patent Gmbh Verteiler zum Verteilen einer Faserstoffsuspension

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113529468A (zh) * 2021-07-15 2021-10-22 绵阳同成智能装备股份有限公司 一种流浆箱唇口自动调节和开度检测装置

Also Published As

Publication number Publication date
EP1590529A1 (fr) 2005-11-02
DE10303466A1 (de) 2004-09-30

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