EP0997578B1 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP0997578B1
EP0997578B1 EP99116257A EP99116257A EP0997578B1 EP 0997578 B1 EP0997578 B1 EP 0997578B1 EP 99116257 A EP99116257 A EP 99116257A EP 99116257 A EP99116257 A EP 99116257A EP 0997578 B1 EP0997578 B1 EP 0997578B1
Authority
EP
European Patent Office
Prior art keywords
jet
wall
support
supports
center section
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
EP99116257A
Other languages
German (de)
English (en)
Other versions
EP0997578A1 (fr
Inventor
Wolf Gunter Stotz
Thomas Merath
Klaus Lehleiter
Christoph Link
Josef Frey
Eckart Krägeloh
Thomas Dietz
Simon Juhas
Banning Jürgen
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 Patent GmbH
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
Priority claimed from DE29823639U external-priority patent/DE29823639U1/de
Priority claimed from DE19927241A external-priority patent/DE19927241A1/de
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Priority to EP03100988A priority Critical patent/EP1342835B1/fr
Publication of EP0997578A1 publication Critical patent/EP0997578A1/fr
Application granted granted Critical
Publication of EP0997578B1 publication Critical patent/EP0997578B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/024—Details of the feed chamber
    • 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
    • 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
    • D21F1/026—Details of the turbulence section
    • 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
    • D21F1/028—Details of the nozzle section

Definitions

  • the invention relates to a headbox for a paper machine with a nozzle extending transversely to the machine direction across the machine width and having a lower and an upper, continuous wall, each extending across the machine width.
  • Such a headbox is known, for example, from DE 41 06 764 A1.
  • the lower nozzle wall is generally supported by an inlet table provided as a continuous welded construction.
  • inlet table provided as a continuous welded construction.
  • the aim of the invention is to provide a headbox of the type mentioned at the outset which, with the most cost-effective construction possible, simple handling and minimal maintenance, practically always ensures a discharge gap which is as parallel as possible, regardless of the respective operating conditions.
  • this object is achieved in that the lower Nozzle wall is supported on a foundation via several separate support elements distributed over the machine width and that these support elements are designed so resilient or flexible transversely to the machine running direction that the lower nozzle wall remains sufficiently flat when the temperature and / or pressure changes.
  • a cross member provided directly on the lower nozzle wall is therefore dispensed with. This also prevents this lower nozzle wall from bending when the temperature changes unevenly.
  • the support elements carry essentially the entire headbox. In the event of a temperature-related change in the length of the lower nozzle wall, these support elements give way transversely to the machine direction. This means that the previously used heating system for compensating for the thermal deflection of the lower nozzle wall can also be dispensed with.
  • the individual support elements can at least partially be generally vertical, i.e. perpendicular to the lower nozzle wall.
  • the individual support elements are preferably at least partially formed by disks parallel to the machine direction, by stud bolts or the like.
  • the support elements can be connected to the foundation directly or also via a base plate and / or a base.
  • the support elements can for example be connected to the lower nozzle wall.
  • the support elements are connected to the support plate.
  • At least one diagonal or transverse strut is expediently provided between successive support elements in a central region viewed transversely to the machine direction.
  • the parallelism of the outlet gap can be ensured under all operating conditions that are practically possible. Deformations of the upper and lower nozzle walls under changing pressure in the nozzle and / or under changing material temperature are therefore at least substantially excluded. If, during operation, the nozzle walls are pressed apart under the liquid pressure, the resulting expansion forces are transmitted fairly uniformly over the machine width by means of the numerous supporting elements or supporting elements mentioned. A deflection of the nozzle walls is avoided.
  • there is an extremely inexpensive construction i.e. in particular a reduced effort for material and production (e.g. processing) as well as for control and regulation devices. In addition to easier handling in operation, there is also a reduced maintenance effort.
  • the component cross-sectional dimensions can be the same for different headboxes with different machine widths. This simplifies drawing creation and manufacturing.
  • the supporting elements must can only be dimensioned according to the maximum pressure prevailing in the nozzle.
  • one or more, e.g. two, hydraulic cylinder and linear stroke flow divider can be provided.
  • linear stroke flow dividers of the MLH series from Jahns-Regulatoren GmbH, D-63069 Offenbach can be used, as described in a corresponding company publication of Jahns-Regulatoren GmbH from March 1997.
  • one or two additional hydraulic cylinders can be provided in the central area.
  • Figures 1 and 2 show a purely schematic representation of a first embodiment of a headbox 10 for a Fourdrinier former of a paper machine.
  • the headbox 10 comprises a nozzle 12 which extends transversely to the machine direction L across the machine width and has a lower and an upper continuous wall 14 and 16, each extending across the machine width.
  • the upper nozzle wall 16 is hinged 18 by one axis A extending transversely to the machine running direction L is pivotable.
  • the lower nozzle wall 14 can be moved in the machine running direction L on a stationary support plate 20.
  • a central assembly 22 of the headbox 10 comprises a lower arm formed in the present case by the support plate 20, an upper arm 24 preferably at least substantially parallel thereto, an upstream first central part 26 and a second central part 28 lying further back or downstream in the machine direction L.
  • the upper arm 24 and the two central parts 26, 28 arranged between this and the lower arm 20 preferably form support elements of a turbulence generator.
  • this lower nozzle wall or a corresponding section thereof can be attributed to the central assembly 22 instead of the support plate 20.
  • the central assembly 22 is supplied with fiber suspension 32, for example, via a cross distributor pipe 30.
  • the central assembly 22 which is designed as a turbulence generator in the present exemplary embodiment, is provided with a plurality of step diffusers or with stepless turbulence tubes.
  • the flow is led to an outlet gap 36 via the lower nozzle wall 14 and the upper nozzle wall 16 and lateral boundaries 34 such as side plates or the like.
  • the machine-wide stream of material emerging from the outlet gap 36 arrives in the region of a breast roller 38 on an endless circulating screen belt 40.
  • the stationary support plate 20 for the lower nozzle wall 14 or a stationary nozzle wall is supported on a foundation 44 via a plurality of separate support elements 42 distributed over the machine width.
  • the Support elements 42 are designed to be flexible or pliable transversely to the machine running direction L.
  • the individual support elements 42 extend vertically, i.e. perpendicular to the lower nozzle. senwand 14 or the support plate 20.
  • these support elements 42 are formed by parallel to the machine direction L disks. However, for example, they can also be formed by stud bolts or the like.
  • the support elements 42 are connected e.g. made of concrete base 46 connected to the foundation 44. Basically, these support elements 42 can also be connected directly to the foundation 44. At the other end, the support elements 42 are each connected to the support plate 20. In the case of a non-displaceable, i.e. The support elements would be connected to the non-displaceable lower nozzle wall in one piece with the lower nozzle wall.
  • a diagonal bracing 48 is provided between the two central support elements 42 viewed transversely to the machine running direction L.
  • a cross member directly connected to the support plate 20 is missing. Accordingly, it was also possible to dispense with a heating system to compensate for thermal bending of the support plate 20 or the nozzle wall 14. At most, heating devices (not shown) are conceivable for changing the height of at least one of the support elements 42, specifically for the (although hardly to be expected) case of deformation of the foundation 44 or the base 46.
  • the upper nozzle wall 16 which can be pivoted about the transverse axis A via the hinge 18, is connected to a cross member 52 arranged above the pivot axis A via a plurality of separate support elements 50 distributed over the machine width.
  • the support elements 50 are again designed to be flexible or flexible transversely to the machine running direction L.
  • the individual support elements 50 extend vertically, i.e. perpendicular to the upper nozzle wall 16.
  • the individual support elements 50 are again formed by disks parallel to the machine running direction L.
  • an upright sheet metal or a hollow beam can be provided as the cross member 52 (cf. in particular FIG. 1).
  • One or more lifting elements 54 are articulated on the one hand on the central assembly 22 and on the other hand on the cross member 52 via articulated axes 56 and 58, respectively.
  • the upper nozzle wall 16 can thus be pivoted about the axis A in the direction of the arrow F (cf. FIG. 1) via these lifting elements 54.
  • the lifting elements 54 can be, for example, threaded spindles, hydraulic cylinders and / or the like.
  • Lifting elements 60 are again provided for the linear displacement of the lower nozzle wall 14.
  • the lower nozzle wall 14 is driven via two hydraulic cylinders 60 and linear stroke flow dividers, which are provided on opposite sides and are brought to market, for example by the company Jahns-Regulatoren GmbH become. If the machine width is large, one or two additional lifting elements or hydraulic cylinders 60 'can be provided in the central area.
  • the upper arm 24 and the second central part 28 of the central assembly 22, which is at the rear in the machine direction L, are each segmented transversely to the machine direction L.
  • the inlet-side first central part 26 of the central assembly 22 and the support plate 20 for the displaceable lower nozzle wall 14 are each designed to run transversely to the machine running direction L.
  • FIG. 3 shows a schematic, partially sectioned side view of a further embodiment of a headbox 10 for a twin-wire former.
  • the fiber suspension is fed through a transverse distributor pipe 30 via a plurality of lines 68 to an inlet part 67 connected upstream of the central assembly 22, it being possible to provide a material density control sectioned transversely to the machine running direction L.
  • the machine-wide stream of material emerging from the outlet gap 36 enters an inlet gap 74 formed between two screen belts 70, 72.
  • headbox 10 is oriented essentially horizontally in the embodiment shown in FIGS. 1 and 2, the headbox 10 in the embodiment shown in FIG directed.
  • this headbox 10 has at least essentially the same structure as in the exemplary embodiments according to FIGS. 1 and 2.

Landscapes

  • Paper (AREA)

Claims (9)

  1. Caisse de tête (10) pour une machine à papier avec une tuyère (12) s'étendant transversalement au sens machine (L) sur l'étendue de la laise, qui présente une cloison (14 ou 16) inférieure et supérieure ininterrompue s'étendant respectivement sur l'étendue de la laise, caractérisée en ce que la cloison de tuyère inférieure (14) est en appui sur une assise (44) via plusieurs éléments de support (42) séparés répartis sur l'étendue de la laise, et en ce que ces éléments de support (42) transversalement au sens machine (L) sont développés de manière à être si flexibles ou souples à la flexion, que la cloison de tuyère inférieure (14) reste suffisamment plane en cas de modification de température et/ou de pression.
  2. Caisse de tête selon la revendication 1, caractérisée en ce que les éléments de support (42) individuels s'étendent généralement au moins partiellement à la verticale, c'est-à-dire perpendiculairement à la cloison de tuyère inférieure (14).
  3. Caisse de tête selon la revendication 1 ou 2, caractérisée en ce que les éléments de support (42) individuels sont au moins partiellement formés par des disques parallèles au sens machine (L).
  4. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que les éléments de support (42) individuels sont au moins partiellement formés par des boulons d'entretoisement ou similaires.
  5. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que les éléments de support (42) sont directement reliés à l'assise (44).
  6. Caisse de support selon l'une quelconque des revendications 1 à 5, caractérisée en ce que les éléments de support (42) sont reliés à l'assise (44) via une plaque de base et/ou un socle (46).
  7. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que les éléments de support (42) sont reliés avec la cloison de tuyère inférieure (14).
  8. Caisse de tête selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la cloison de tuyère inférieure (14) est déplaçable sur une plaque d'appui (20) stationnaire dans le sens machine (L), et en ce que les éléments de support (42) sont reliés à la plaque d'appui (20).
  9. Caisse de tête selon l'une quelconque des revendications précédentes, caractérisée en ce que dans une zone médiane lorsque vue transversalement au sens machine (L), entre des éléments de support (42) qui se suivent, au moins un entretoisement (48) diagonal ou transversal est prévu.
EP99116257A 1998-10-05 1999-08-18 Caisse de tête Expired - Lifetime EP0997578B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03100988A EP1342835B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE29823639U DE29823639U1 (de) 1998-10-05 1998-10-05 Stoffauflauf
DE29823639U 1998-10-05
DE19927241 1999-06-15
DE19927241A DE19927241A1 (de) 1998-10-05 1999-06-15 Stoffauflauf

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP03100988A Division EP1342835B1 (fr) 1998-10-05 1999-08-18 Caisse de tête
EP03100988A Division-Into EP1342835B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Publications (2)

Publication Number Publication Date
EP0997578A1 EP0997578A1 (fr) 2000-05-03
EP0997578B1 true EP0997578B1 (fr) 2004-04-28

Family

ID=26053777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116257A Expired - Lifetime EP0997578B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Country Status (2)

Country Link
EP (1) EP0997578B1 (fr)
AT (1) ATE265571T1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004038541A1 (de) * 2004-08-06 2006-03-16 Voith Paper Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn
DE102004038560A1 (de) * 2004-08-06 2006-03-16 Voith Paper Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn
DE102008042032A1 (de) 2008-09-12 2010-03-18 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers
DE102009045166A1 (de) * 2009-09-30 2011-03-31 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn
DE102009045221A1 (de) 2009-09-30 2011-03-31 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313681A (en) * 1964-08-27 1967-04-11 Beloit Corp Headbox with bottom wall having controllable deflection
DE3628699A1 (de) * 1986-08-23 1988-03-03 Voith Gmbh J M Stoffauflauf
DE9102095U1 (de) * 1991-02-22 1991-05-16 J.M. Voith Gmbh, 7920 Heidenheim Kanalwand, insbesondere für einen Papiermaschinen-Stoffauflauf

Also Published As

Publication number Publication date
ATE265571T1 (de) 2004-05-15
EP0997578A1 (fr) 2000-05-03

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