EP1342835B1 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP1342835B1
EP1342835B1 EP03100988A EP03100988A EP1342835B1 EP 1342835 B1 EP1342835 B1 EP 1342835B1 EP 03100988 A EP03100988 A EP 03100988A EP 03100988 A EP03100988 A EP 03100988A EP 1342835 B1 EP1342835 B1 EP 1342835B1
Authority
EP
European Patent Office
Prior art keywords
headbox
running direction
central
machine running
nozzle wall
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
EP03100988A
Other languages
German (de)
English (en)
Other versions
EP1342835A2 (fr
EP1342835A3 (fr
Inventor
Wolf Gunter Stotz
Thomas Merath
Klaus Lehleiter
Christoph Link
Josef Frey
Eckart Krägeloh
Thomas Dietz
Simon Juhas
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
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Priority claimed from EP99116257A external-priority patent/EP0997578B1/fr
Publication of EP1342835A2 publication Critical patent/EP1342835A2/fr
Publication of EP1342835A3 publication Critical patent/EP1342835A3/fr
Application granted granted Critical
Publication of EP1342835B1 publication Critical patent/EP1342835B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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 over the machine width according to the preamble of claim 1.
  • the lower nozzle wall is usually supported via an intended as a continuous welded construction inlet table.
  • the thermal expansion due to the material temperature due to the influence of the thermal expansion due to the material temperature, however, deviations from the desired parallelism of the outlet gap can occur.
  • the aim of the invention is to provide a headbox of the type mentioned above, which ensures the most parallel possible outlet gap with the most cost-effective design, easy handling and minimal maintenance practically independent of the respective operating conditions (see, for example, WO 88 01318 A).
  • the central assembly is thus formed by a partially segmented C-shaped bracket, with basically only those parts not segmented are, that is so running in the transverse direction are running, limit the material-carrying spaces.
  • the stationary support plate is preferably also segmented transversely to the machine direction.
  • a continuous hinge bearing extending transversely to the machine direction is preferably provided on the rearward or downstream end of the upper arm of the central assembly in the machine n-direction.
  • This hinge bearing can each have a material weakening in the region between the individual segments of the adjacent upper arm.
  • the pitch of segments of the upper arm of the central assembly defined by the distances from segment center to segment center is equal to the pitch of the segments of the rear and downstream second central portions of the central assembly, respectively.
  • the parallelism of the outlet gap can be ensured under all operating conditions that are in question. Deformations of the upper and lower nozzle wall under varying 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 fluid pressure, the resulting expanding forces are produced by means of the numerous support elements or supporting elements mentioned passed fairly evenly across the machine width. A deflection of the nozzle walls is thus avoided.
  • there is an extremely cost-effective design that is, in particular a reduced effort for material and manufacturing (for example, machining) and for control and regulating devices. Apart from a simpler handling during operation, there is also a reduced maintenance effort.
  • the component cross-sectional dimensions may be the same for different headboxes of different machine widths. This simplifies the drafting and the production.
  • the load-bearing elements only have to be dimensioned according to the maximum pressure prevailing in the nozzle.
  • one or more, for example two, hydraulic cylinder and linear stroke flow divider may be provided.
  • one or more, for example two, hydraulic cylinder and linear stroke flow divider may be provided.
  • linearhub flow divider MLH series of Jahns-Regulators GmbH, D-63069 Offenbach can be used, as described in a corresponding company publication of Jahns-Regulators GmbH in March 1997.
  • one or two additional hydraulic cylinders may be provided in the central region.
  • the headbox may in particular be provided with a central subassembly which comprises a lower arm formed by the lower nozzle wall or the support plate associated therewith, a preferably parallel upper arm, an inlet-side first central part and a second central part lying behind it in the machine direction, the upper one Arm and the two arranged between this and the lower arm central parts preferably form support elements of a turbulence generator.
  • a central subassembly which comprises a lower arm formed by the lower nozzle wall or the support plate associated therewith, a preferably parallel upper arm, an inlet-side first central part and a second central part lying behind it in the machine direction, the upper one Arm and the two arranged between this and the lower arm central parts preferably form support elements of a turbulence generator.
  • the cross member to be connected to the central assembly via at least one lifting element, preferably over at most three lifting elements and in particular via only one lifting element or via only two lifting elements.
  • the individual support elements extend at least partially generally vertically, that is perpendicular to the upper nozzle wall.
  • the individual support elements are preferably at least partially formed by parallel to the machine direction discs.
  • Headbox 10 includes a nozzle 12 extending across the machine width, transverse to the machine direction L, having lower and upper continuous walls 14 and 16, respectively extending across the machine width.
  • upper nozzle wall 16 is hinged about hinge 18 extending transversely to the machine direction L A pivot axis.
  • the lower nozzle wall 14 on a stationary support plate 20 in the machine direction L can be displaced.
  • a central assembly 22 of the headbox 10 comprises a lower arm formed in this case by the support plate 20, a preferably at least substantially parallel upper arm 24, an upstream first central portion 26 and a downstream in the machine direction L or downstream second central portion 28th
  • the upper arm 24 and the two central parts 26, 28 arranged between the latter and the lower arm 20 preferably form carrier elements of a turbulence generator.
  • this lower nozzle wall or a corresponding portion thereof of the central assembly 22 can be attributed.
  • the central assembly 22 which is designed as a turbulence generator in the present exemplary embodiment, is provided with a plurality of stage diffusers or stepless turbulence pipes. Via the lower nozzle wall 14 and the upper nozzle wall 16 and lateral boundaries 34 such as side plates or the like, the flow is led to an outlet gap 36. The machine-wide material jet emerging from the outlet gap 36 arrives in the area of a breast roll 38 on an endless circulating screen belt 40.
  • the individual support elements 42 extend vertically, that is to say perpendicular to the lower nozzle wall 14 or the support plate 20.
  • these support elements 42 are formed by disks parallel to the machine direction L. However, they may for example also be formed by studs or the like.
  • the above the hinge 18 about the transverse axis A pivotable upper nozzle wall 16 is connected via a plurality of distributed over the machine width separate support members 50 with a above the pivot axis A arranged cross member 52. Also, the support members 50 are again transversely to the machine direction L compliant or flexible formed.
  • a cross member 52 for example, an upright standing sheet metal or a hollow bar may be provided (see in particular Figure 1).
  • lifting elements 60 are again provided.
  • the upper arm 24 and the rear in the machine direction L second central part 28 of the central assembly 22 are each transversely to the machine direction L segmented.
  • the inlet-side first central portion 26 of the central assembly 22 and the support plate 20 for the displaceable lower nozzle wall 14 are formed transversely to the machine direction L in each case continuously.
  • Figure 3 shows a schematic perspective view of the central assembly 22 of a headbox. If the lower nozzle wall 14 (see FIG. 1) is not displaceable, it may be formed in one piece with the support plate 20.
  • FIG. 4 again shows a schematic perspective illustration of the central subassembly of a headbox, provided for a lower nozzle wall 14 displaceable in the machine direction L on a stationary support plate 20 (see also FIGS. 1 and 2).
  • the stationary support plate 20 is also segmented transversely to the machine direction L.
  • the hinge bearing 62 transverse to the machine direction L has a constant cross-section.
  • the hinge bearing 62 has a material weakening 66 in the region between the individual segments 24 'of the adjacent upper arm 24. It is also conceivable, for example, for the hinge bearing 62 according to FIG. 4 to be composed of a continuous lower part and of a plurality (ie, segmented) upper parts.
  • the division of the segments 24 'of the upper arm 24 of the central subassembly 22, defined by the distances from the middle of the segment to the middle of the segment, is equal to the division of the segments 28' of the second central part 28 of the central one in the machine direction L in both embodiments shown in FIGS Assembly 22.
  • the division of the support elements 42 and the support elements 50 defined by the distances from element center to element center is equal to the pitch of the segments 20 ', 24', 28 'of the central assembly 22.
  • the segments 24 'and 28' of the central assembly 22 are provided in the form of individual blocks distributed across the machine width. This also applies (in the case of FIG. 4) to the upper parts of the hinge bearing 62.
  • Figure 5 shows a schematic, partially sectioned side view of another embodiment of a headbox 10 for a twin-wire former.
  • one of the central assembly 22 upstream feed part 67, the fiber suspension through the transverse distribution pipe 30 via a plurality of lines 68, wherein a transversely to the machine direction L sectioned material density control can be provided.
  • the machine-wide material jet emerging from the outlet gap 36 passes into an inlet gap 74 formed between two screen belts 70, 72.
  • the headbox 10 While in the embodiment illustrated in Figures 1 and 2, the headbox 10 is aligned substantially horizontally, the headbox 10 is in the embodiment shown in Figure 5 with its outlet gap 36 obliquely upward in the inlet gap formed between the two sieve belts 70, 72 74th directed.
  • this headbox 10 has at least substantially the same structure as in the embodiments of Figures 1 to 4.

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  • Paper (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Claims (12)

  1. Caisse de tête (10) pour une machine à papier comprenant une buse (12) s'étendant transversalement à la direction d'avance de la machine (L) sur la largeur de la machine, laquelle présente une paroi inférieure et une paroi supérieure (14, respectivement 16) continues, s'étendant chacune sur la largeur de la machine, et comprenant un module central (22), qui comporte un bras inférieur formé par la paroi de buse inférieure respectivement par la plaque porteuse (20) associée à celle-ci, un bras supérieur (24) de préférence parallèle à celui-ci, une première partie centrale (26) du côté de l'entrée et une deuxième partie centrale (28) située derrière dans la direction d'avance de la machine (L), le bras supérieur (24) et les deux parties centrales (26, 28) disposées entre celui-ci et le bras inférieur (20) formant de préférence des éléments de support d'un générateur de turbulences,
    caractérisée en ce que
    le bras supérieur (24) et la deuxième partie centrale arrière (28) du module central (22) sont segmentés respectivement transversalement à la direction d'avance de la machine (L) et
    en ce que la première partie centrale (26), du côté de l'entrée, du module central (22) et la paroi de buse inférieure (14) sont réalisées chacune de manière continue transversalement à la direction d'avance de la machine (L).
  2. Caisse de tête (10) selon la revendication 1,
    caractérisée en ce que
    la paroi de buse inférieure (14) peut être déplacée sur une plaque porteuse stationnaire (20) dans la direction d'avance de la machine (L) et
    en ce que de préférence également la plaque porteuse stationnaire (20) est segmentée transversalement à la direction d'avance de la machine (L).
  3. Caisse de tête (10) selon la revendication 1 ou 2,
    caractérisée en ce que
    la paroi de buse supérieure (16) peut pivoter par le biais d'une charnière (18) autour d'un axe (A) s'étendant transversalement à la direction d'avance de la machine (L) et
    en ce qu'à l'extrémité arrière, dans la direction d'avance de la machine (L), du bras supérieur (24) du module central (22) est prévu un support de charnière (62) continu s'étendant transversalement à la direction d'avance de la machine (L).
  4. Caisse de tête (10) selon la revendication 3,
    caractérisée en ce que
    le support de charnière (62) présente, dans la région entre les segments individuels (24') du bras supérieur adjacent, à chaque fois un affaiblissement de matière (66).
  5. Caisse de tête (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la division des segments (24') du bras supérieur (24) du module central, définie par les distances d'un centre de segment à l'autre, est égale à la division des segments (28') de la deuxième partie centrale arrière (28) du module central.
  6. Caisse de tête (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la paroi de buse supérieure (16) peut pivoter autour d'un axe (A) s'étendant transversalement à la direction d'avance de la machine (L) et est connectée par le biais de plusieurs éléments de support (50) séparés et répartis sur la largeur de la machine, à un support transversal (52) disposé au-dessus de l'axe de pivotement (A), et
    en ce que ces éléments de support (50) sont réalisés transversalement à la direction d'avance de la machine (L) de manière flexible ou souple de telle sorte que la paroi de buse supérieure (16) reste suffisamment plane sous l'effet d'une variation de température et/ou de pression.
  7. Caisse de tête (10) selon la revendication 6,
    caractérisée en ce que
    le support transversal (52) est connecté par le biais d'au moins un élément de levage (54), de préférence par le biais d'au plus trois éléments de levage (54) et notamment par le biais de seulement un élément de levage (54) ou par le biais de seulement deux éléments de levage (54) au module central (22).
  8. Caisse de tête (10) selon la revendication 6 ou 7,
    caractérisée en ce que
    les éléments de support individuels (50) s'étendent au moins en partie généralement verticalement, c'est-à-dire perpendiculairement à la paroi de buse supérieure (16).
  9. Caisse de tête (10) selon l'une quelconque des revendications 6 à 8,
    caractérisée en ce que
    les éléments de support individuels (50) sont formés au moins en partie par des plaques parallèles à la direction d'avance de la machine (L).
  10. Caisse de tête (10) selon l'une quelconque des revendications 6 à 9,
    caractérisée en ce que
    le support transversal (52) est formé par une tôle debout sur son chant.
  11. Caisse de tête (10) selon l'une quelconque des revendications 6 à 10,
    caractérisée en ce que
    le support transversal (52) est formé par une poutre creuse.
  12. Caisse de tête (10) selon l'une quelconque des revendications 6 à 11,
    caractérisée en ce que
    la division définie par les distances d'un centre d'élément à l'autre, des éléments d'appui (42) supportant la plaque porteuse (20), respectivement la paroi de buse inférieure (14), sur un socle (44), et des éléments de support (50) est égale à la division des segments (20', 24', 28') du module central (22).
EP03100988A 1998-10-05 1999-08-18 Caisse de tête Expired - Lifetime EP1342835B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE29823639U DE29823639U1 (de) 1998-10-05 1998-10-05 Stoffauflauf
DE29823639U 1998-10-05
DE19927421 1999-06-15
DE19927421 1999-06-15
EP99116257A EP0997578B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP99116257.9 Division 1999-08-18
EP99116257A Division EP0997578B1 (fr) 1998-10-05 1999-08-18 Caisse de tête
EP99116257A Division-Into EP0997578B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Publications (3)

Publication Number Publication Date
EP1342835A2 EP1342835A2 (fr) 2003-09-10
EP1342835A3 EP1342835A3 (fr) 2003-10-29
EP1342835B1 true EP1342835B1 (fr) 2006-07-12

Family

ID=36776471

Family Applications (1)

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

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EP (1) EP1342835B1 (fr)
AT (1) ATE332999T1 (fr)
DE (1) DE59913673D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009045166A1 (de) 2009-09-30 2011-03-31 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP1342835A2 (fr) 2003-09-10
DE59913673D1 (de) 2006-08-24
EP1342835A3 (fr) 2003-10-29
ATE332999T1 (de) 2006-08-15

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