EP1342835A2 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP1342835A2
EP1342835A2 EP03100988A EP03100988A EP1342835A2 EP 1342835 A2 EP1342835 A2 EP 1342835A2 EP 03100988 A EP03100988 A EP 03100988A EP 03100988 A EP03100988 A EP 03100988A EP 1342835 A2 EP1342835 A2 EP 1342835A2
Authority
EP
European Patent Office
Prior art keywords
headbox
machine direction
nozzle wall
machine
central
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.)
Granted
Application number
EP03100988A
Other languages
German (de)
English (en)
Other versions
EP1342835B1 (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 running direction across the machine width according to the preamble of claim 1.
  • 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 create a headbox of the type mentioned at the outset which, with the most cost-effective design, 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 according to the invention in that the upper arm and the rear or downstream second central part of the central assembly are each segmented transversely to the machine direction and that the inlet-side first central part of the central assembly and the lower one Nozzle wall are formed continuously across the machine direction.
  • the central assembly is thus formed by a partially segmented C-shaped bracket, in principle only those parts not being segmented are, that is to say executed continuously in the transverse direction, which delimit material-carrying rooms.
  • the stationary support plate is preferably also segmented transversely to the machine running direction.
  • the division of the segments of the upper arm of the central assembly defined by the spacings from segment center to segment center is equal to the division of the segments of the rear or downstream second central part of the central assembly.
  • 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 essentially excluded. If, during operation, the nozzle walls are pressed apart under the liquid pressure, the resulting expansion forces are achieved by means of the numerous support elements or support elements mentioned forwarded fairly evenly across the machine width. A deflection of the nozzle walls is avoided.
  • there is an extremely inexpensive construction which means in particular a reduced outlay for material and production (for example processing) and 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 only have to be dimensioned according to the maximum pressure prevailing in the nozzle.
  • One or more, for example two, hydraulic cylinders and linear stroke flow dividers can, for example, be provided as the drive for such a displaceable lower nozzle wall.
  • 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.
  • the upper nozzle wall is pivotable about an axis extending transversely to the machine direction and is connected via a plurality of separate support elements distributed over the machine width to a cross member arranged above the swivel axis and that these support elements are designed to be so flexible or flexible transversely to the machine running direction that the upper nozzle wall remains sufficiently flat in the event of a temperature and / or pressure change.
  • a headbox is already described in DE 41 06 764 A1, in which the upper nozzle wall is connected to a rigid beam via flexible rods.
  • the headbox can in particular be provided with a central assembly, which comprises a lower arm formed by the lower nozzle wall or the support plate assigned to it, an upper arm preferably parallel thereto, an inlet-side first central part and a second central part lying behind in the machine direction, the upper one Arm and the two central parts arranged between this and the lower arm preferably form support elements of a turbulence generator.
  • the cross member is connected to the central assembly via at least one lifting element, preferably via at most three lifting elements and in particular via only one lifting element or only two lifting elements.
  • the individual support elements extend at least partially generally vertically, that is to say perpendicularly to the upper nozzle wall.
  • the individual support elements are preferably at least partially formed by disks parallel to the machine direction.
  • the cross member can be formed, for example, by an upright sheet metal or by a hollow beam.
  • 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 a hinge 18 extending transversely to the machine direction L Axis A swiveling.
  • the lower nozzle wall 14 can be moved in the machine running direction L on a stationary 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 flexible transversely to the machine running direction L.
  • 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.
  • they can also be formed by stud bolts or the like.
  • the support elements 42 are connected to the foundation 44 via a base 46, for example made of concrete. 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, that is to say integrally formed with the support plate, the lower nozzle wall, the support elements would be connected to the non-displaceable 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 deflection 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, that is to say perpendicular to the upper nozzle wall 16.
  • the individual support elements 50 are again formed by disks parallel to the machine direction L.
  • an upright sheet metal or a hollow beam can be provided as the cross member 52 (compare 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 (see 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 by two hydraulic cylinders 60 and linear stroke flow dividers, which are provided on opposite sides, as are brought onto the market by Jahns-Regulatoren GmbH, for example. 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. 4 again shows a schematic perspective illustration of the central assembly of a headbox, provided for a lower nozzle wall 14 that can be displaced in FIG. 4 on a stationary support plate 20 and is omitted in FIG. 4 (compare also FIGS. 1 and 2).
  • the stationary support plate 20 is also segmented transversely to the machine running direction L.
  • a continuous hinge bearing 62 of the hinge 18 (see also FIG. 1) extending transversely to the machine direction L is provided, into which a counter element 64 provided on the upper nozzle wall 16 (see Figure 1) engages.
  • the hinge bearing 62 has a constant cross section transverse to the machine running direction L.
  • the hinge bearing 62 has a material weakening 66 in the area between the individual segments 24 'of the adjacent upper arm 24. It is also conceivable, for example, that the hinge bearing 62 according to FIG. 4 is composed of a continuous lower part and of several (ie segmented) upper parts.
  • the division of the support elements 42 and the support elements 50 which is defined by the distances from the element center to the element center, is equal to the division 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 over the machine width. This also applies (in the case of FIG. 4) to the upper parts of the hinge bearing 62.
  • FIG. 5 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.
  • the headbox 10 is oriented essentially horizontally in the embodiment shown in FIGS. 1 and 2, the headbox 10 in the embodiment shown in FIG. 5 has its outlet gap 36 obliquely upward in the inlet gap 74 formed between the two sieve belts 70, 72 directed.
  • this headbox 10 has at least essentially the same structure as in the exemplary embodiments according to FIGS. 1 to 4.

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  • Magnetic Resonance Imaging Apparatus (AREA)
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 true EP1342835A2 (fr) 2003-09-10
EP1342835A3 EP1342835A3 (fr) 2003-10-29
EP1342835B1 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

Country Status (3)

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

Cited By (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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988001318A1 (fr) * 1986-08-23 1988-02-25 J.M. Voith Gmbh Caisse de tete
DE4106764A1 (de) * 1991-02-22 1992-08-27 Voith Gmbh J M Kanalwand, insbesondere fuer einen papiermaschinen-stoffauflauf

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988001318A1 (fr) * 1986-08-23 1988-02-25 J.M. Voith Gmbh Caisse de tete
DE4106764A1 (de) * 1991-02-22 1992-08-27 Voith Gmbh J M Kanalwand, insbesondere fuer einen papiermaschinen-stoffauflauf

Cited By (3)

* 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
CN102812181A (zh) * 2009-09-30 2012-12-05 沃依特专利有限责任公司 用于制造纤维料幅，尤其纸或卡纸幅的机器的流浆箱
CN102812181B (zh) * 2009-09-30 2015-06-03 沃依特专利有限责任公司 用于制造纤维料幅,尤其纸或卡纸幅的机器的流浆箱

Also Published As

Publication number Publication date
EP1342835B1 (fr) 2006-07-12
DE59913673D1 (de) 2006-08-24
EP1342835A3 (fr) 2003-10-29
ATE332999T1 (de) 2006-08-15

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