EP0521966B1 - Dispositif hydraulique de support - Google Patents

Dispositif hydraulique de support Download PDF

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Publication number
EP0521966B1
EP0521966B1 EP91906663A EP91906663A EP0521966B1 EP 0521966 B1 EP0521966 B1 EP 0521966B1 EP 91906663 A EP91906663 A EP 91906663A EP 91906663 A EP91906663 A EP 91906663A EP 0521966 B1 EP0521966 B1 EP 0521966B1
Authority
EP
European Patent Office
Prior art keywords
pressure
beams
contact surface
cushion
fact
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
EP91906663A
Other languages
German (de)
English (en)
Other versions
EP0521966A1 (fr
Inventor
Robert Wolf
Christian Schiel
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT91906663T priority Critical patent/ATE100879T1/de
Publication of EP0521966A1 publication Critical patent/EP0521966A1/fr
Application granted granted Critical
Publication of EP0521966B1 publication Critical patent/EP0521966B1/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
    • D21F1/028—Details of the nozzle 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
    • 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
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars

Definitions

  • the invention relates to a pressure medium support device for supporting a first beam on a second beam extending parallel thereto, in particular with the features specified in the preamble of claim 1.
  • the invention has for its object to develop the pressure medium support device described above in such a way that the support force generated by the pressure pad does not change or at least only changes slightly if the distance between the two bars along the bar length is different (e.g. due to deflection of one of the two bars) or if the distance between the two bars changes for other reasons during operation.
  • the invention ensures that - at least on one of the two bars - the pressure pad exerts a support force which is at least approximately constant over the length of the bar under all occurring operating conditions. This is achieved in that, seen in cross section, there is a free space on both sides of the contact surface, the width of which is smaller than the total width of the pressure pad, into which a loop of the pressure pad extends.
  • the supporting force is now composed of the pure compressive force, which depends on the internal pressure and the width of the contact area, and tension forces resulting from the internal pressure in the loops. If the distance between the two bars changes while the internal pressure remains the same, the width of the contact area remains at least approximately the same; in addition, the clamping forces mentioned change very little or (in particularly favorable cases) not at all.
  • the characterizing features of claim 1 are already known from US-PS 4,559,105, but which relates to a pressure medium support device of a completely different type. It is a bar that is used to support a sieve belt, but is not flexibly arranged. The bar rests on a cross-sectionally C-shaped bar that is pushed onto a cross-sectionally T-shaped bar. A certain amount of play is provided to facilitate the assembly of the two beams. In order to switch off the game during operation, the two bars are clamped together by means of a pressure cushion, so that they form a form-fitting unit during operation. Thus, the known construction cannot make use of the advantages of the invention described above.
  • FIG. 1 shows a longitudinal section (along the line I-I of FIG. 1B) through the headbox of a paper machine with a pressure medium support device provided between two bars.
  • FIG. 1A is a detail from FIG. 2 with an increased distance between the bars (section along line A-A of FIG. 1B).
  • FIG. 1B is a partial view in the direction of arrow B in FIG. 1.
  • FIG. 2 shows a partial cross section through a strip for the flexible support of a sieve belt in a double sieve arrangement.
  • FIG. 2A shows the bar of FIG. 2 in a position withdrawn from the sieve belts.
  • the headbox shown in FIGS. 1, 1A and 1B is used in a known manner for feeding a machine-wide stock suspension jet onto the endless screen belt 9 of a paper making machine.
  • the sieve belt 9 runs, inter alia, over a breast roller 8 arranged on the headbox and over a sieving table 7 upstream part 25 of the upper channel wall is also fixed in the example shown; ie it is part of the fixed headbox housing 24.
  • the downstream part 26 of the upper channel wall is movable in order to be able to vary the clear width of the outlet gap 23. This flexibility is preferred realized in that the downstream part 26 is fastened to the upstream part 25 by means of a hinge 27.
  • a beam namely a so-called channel wall support 16 is placed on its upper side and rigidly connected to it (e.g. by welding).
  • the channel wall support 16 is preferably box-shaped; it has a front wall 17, a rear wall 18 and an upper wall 19.
  • a further beam namely a box-shaped support beam 31, is arranged above the channel wall beam 16.
  • Both carriers 16 and 31 are shown in cross section in FIG. 1; they extend over the entire machine width and are connected only at their two ends (i.e. on the driver side and on the drive side of the paper machine) with the aid of flexible connecting elements 30.
  • the support bracket 31 has a pin 33 at each of its two ends.
  • a lifting device is connected to this, of which only a spindle 13 and (in FIG. 1) a bearing bracket 28 attached to the housing 24 are indicated schematically.
  • a pressure pad 32 is arranged between the channel wall support 16 and the support support 31, preferably in the form of a hose to which a pressure fluid can be applied. It would also be conceivable to use a membrane instead of the hose.
  • the pressure prevailing in the pressure pad 32 can be changed (with the aid of control elements, not shown). It can take into account, for example, the liquid pressure prevailing in the outlet channel 4 and the weight of the movable channel wall 26 and the channel wall support 16 are dimensioned so that the movable channel wall 26 is completely free of deflection.
  • the support bracket 31 is bent a little upward, as can be seen in FIG. 1B. It is expedient here to regulate the liquid pressure as a function of a continuous measurement of the deflection of the channel wall support 16 (as is known per se from US Pat. No. 3,994,773 file P 33 02).
  • Temperature control channels 38 and 39 are provided within the channel wall support 16.
  • the upper wall 19 of the channel wall support 16 is provided on its upper side with a strip 19 '.
  • the top of this bar 19 ' forms the so-called contact surface of the channel wall support 16 against which the pressure pad 32 rests.
  • the width of the contact surface of the bar 19 ' is smaller than the total width of the pressure pad 32.
  • the support beam 31 has a lower wall 42 and side walls 43. The latter extend downward beyond the lower wall 42; there they support the pressure pad 32 laterally.
  • the width of the lower wall 42 is thus substantially equal to the total width of the pressure pad. In other words: almost the entire outer surface of the lower wall forms the contact surface of the support beam 31 for the pressure pad 32.
  • FIG. 1A shows the pressure pad 32 and the adjoining parts of the two carriers 16 and 31 at a point in the headbox where, as a result of the deflection of the support carrier 31, there is a somewhat greater distance between the two carriers.
  • the width of the contact surface (top of the bar 19 ') between the pressure pad 32 and the channel wall support 16 is unchanged compared to FIG. 1.
  • the supporting force exerted by the pressure cushion on the channel wall support 16 is the same in FIG. 1A as in FIG. 1.
  • the support force exerted by the pressure cushion on the channel wall support 16 is the entire length the carrier 16 and 31 constant.
  • FIG. 2 two wire belts 6 and 9 of a twin wire section of a paper machine are indicated symbolically with dash-dotted lines.
  • the upper sieve belt 6 slides along the underside of strips 5 arranged rigidly in the machine.
  • the lower sieve belt 9 slides over a flexible strip, denoted overall by 50.
  • This consists essentially of a ceramic header 51, which is attached to a movable bar 52; the latter is hereinafter referred to as "movable support bar”.
  • a stationary bar 53 is provided, hereinafter referred to as "stationary guide bar”.
  • a pressure pad 54 is arranged between the movable support bar 52 and the stationary guide bar 53. All of these elements extend transversely to the direction of wire travel, preferably over the entire width (order of magnitude 2 to 10 m) of the screen belts 6 and 9.
  • the pressure pad 54 is again preferably designed as a hose.
  • the movable support bar 52 has in the middle of its inside an approximately rectangular, but rounded projection 52 'in cross section, which corresponds to the bar 19' of FIG. 1.
  • a similar projection 53 ' can also be provided on the stationary guide bar 53.
  • Each of these projections forms a contact surface against which the pressure pad 54 pressurized abuts.
  • each of the two contact areas is in turn smaller than the total width B of the pressure pad 54.
  • free spaces 55 are provided on both sides of each contact area, into which the lateral regions of the pressure pad extend to a greater or lesser extent.
  • each lateral region of the pressure pad 54 forms a loop which more or less fills the free space 55.
  • the pressure pad 54 is depressurized according to FIG. 2A, so that the movable support bar 52 (together with the head bar 51) has moved away from the sieve belts 6 and 9.
  • the free spaces 55 include limited by side surfaces 56 of the protrusions 52 'and 53'.
  • the distance a can change during operation; it can be larger or smaller than that shown in FIG. 2.
  • This can e.g. B. occur when the amount of fiber suspension introduced between the two sieve belts 6 and 9 changes.
  • the cushion pressure remaining the same, there is no or only a slight change in the transmitted support force despite the deformation of the pressure cushion. This ensures that the force with which the bar 50 is pressed against the lower screen belt 9 (and thus the dewatering pressure in the fiber suspension) remains unchanged.
  • the stationary guide bar 53 bends, i.e.
  • the pressure pad 54 For lateral guidance of the pressure pad 54, the latter has two longitudinal ribs 57 which engage in corresponding longitudinal grooves in the projections 52, 53. As can be seen, a stop is missing which would limit the stroke of the movable bar 50 in the upward direction during operation.

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  • Paper (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

Un dispositif hydraulique de support d'une première poutre (52) sur une deuxième poutre (53) comprend un coussin de pression (54) agencé entre les deux poutres. La pression dans le coussin de pression est variable mais uniforme sur toute la longueur du coussin de pression. Le coussin de pression (54) repose sur une surface de contact de la première poutre (52). La largeur (b) de la surface de contact est inférieure, en section transversale, à la largeur totale (B) du coussin de pression (54). Un espace libre (55), dans lequel une boucle du coussin de pression (54) peut pénétrer, est ménagé de chaque côté de la surface de contact.

Claims (10)

  1. Dispositif hydraulique de support pour supporter une première poutre (16; 52) sur une seconde poutre (31; 53) s'étendant parallèlement à elle avec les particularités suivantes :
    a) entre les deux poutres (16/31; 52/53) se trouve au moins un coussin de pression (32; 54) susceptible d'être alimenté avec un fluide sous pression, et qui s'étend en pratique de l'une des extrémités des deux poutres jusqu'à leur autre extrémité, et qui s'applique contre une première surface de contact de la première poutre (16; 52) et contre une seconde surface de contact de la deuxième poutre (31; 53), de sorte que la première poutre est supportée par l'intermédiaire du coussin de pression sur la seconde poutre,
    b) la pression du fluide sous pression ("pression du coussin") uniforme sur toute la longueur du coussin de pression (32; 54) est variable pour pouvoir modifier ainsi la distance entre les deux poutres (16/31; 52/53),
    c) les deux poutres (16/31; 52/53) sont au plus couplées ensemble à leurs deux extrémités, c'est-à-dire que par ailleurs, elles sont dépourvues de dispositifs, qui limitent en service une modification de la distance entre les deux poutres,
    d) dispositif hydraulique de support caractérisé en ce que, en section transversale, la largeur (b) de la surface de contact d'au moins une des deux poutres (16; 52) est inférieure à la largeur totale (B) du coussin de pression (32; 54), et en ce que de chaque côté de cette surface de contact, il est prévu un espace libre (35; 55) dans lequel peut s'étendre une boucle du coussin de pression (32; 54).
  2. Dispositif hydraulique de support selon la revendication 1, caractérisé en ce que les deux poutres (16; 31) sont couplées l'une à l'autre à leurs deux extrémités et au moyen d'éléments élastiques flexibles (30), et en ce que la flexion de la première poutre (16) par rapport à la seconde poutre (31) est susceptible d'être commandée en faisant varier la pression du coussin.
  3. Dispositif hydraulique de support selon la revendication 2, caractérisé en ce que la première poutre (16) fait partie d'une paroi de commande du débit (26) d'une tête de machine à papier.
  4. Dispositif hydraulique de support selon la revendication 1, caractérisé en ce que la première poutre (52), du fait d'une modification de la pression du coussin, est librement mobile sur toute sa longueur par rapport à la seconde poutre (53) et transversalement par rapport à l'étendue longitudinale des deux poutres.
  5. Dispositif hydraulique de support selon la revendication 4, caractérisé en ce que la première poutre (52) revêt la forme d'une barre de support flexible pour une bande de tamis (9) dans un agencement de tamis double.
  6. Dispositif hydraulique de support selon une des revendications 1 à 5, caractérisé en ce que, vue en section transversale, c'est seulement sur une (16) des deux poutres que la largeur de la surface de contact est inférieure à la largeur totale du coussin de pression (32), tandis que l'autre poutre (31) comporte des parois latérales (43) s'étendant transversalement par rapport à la surface de contact, qui étayent latéralement le coussin de pression.
  7. Dispositif hydraulique de support selon une des revendications 1 à 5, caractérisé en ce que, sur chacune des deux poutres (52/53) la largeur (b) de la surface de contact est inférieure à la largeur totale (B) du coussin de pression (54), et en ce qu'il y a sur les poutres des surfaces latérales (56) en retrait partant de la surface de contact et qui délimitent les espaces libres (55) précités.
  8. Dispositif hydraulique de support selon la revendication 1 ou la revendication 7, caractérisé en ce que le coussin de pression (54) a, dans la zone d'au moins une des deux surfaces de contact, une nervure longitudinale (57) qui vient en prise dans une rainure longitudinale correspondante de la poutre (52 et/ou 53).
  9. Dispositif hydraulique de support selon une des revendications 1 à 8, caractérisé en ce que la surface de contact dont la largeur (b) est inférieure à la largeur totale du coussin de pression (32; 54) est formée par une barre (19') (appartenant à la poutre concernée).
  10. Dispositif hydraulique de support selon une des revendications 1 à 9, caractérisé en ce que le coussin de pression (32; 54) revêt la forme d'un tuyau souple.
EP91906663A 1990-03-26 1991-03-22 Dispositif hydraulique de support Expired - Lifetime EP0521966B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91906663T ATE100879T1 (de) 1990-03-26 1991-03-22 Druckmittel-stuetzeinrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4009628 1990-03-26
DE4009628A DE4009628C2 (de) 1990-03-26 1990-03-26 Druckmittel-Stützeinrichtung

Publications (2)

Publication Number Publication Date
EP0521966A1 EP0521966A1 (fr) 1993-01-13
EP0521966B1 true EP0521966B1 (fr) 1994-01-26

Family

ID=6403053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91906663A Expired - Lifetime EP0521966B1 (fr) 1990-03-26 1991-03-22 Dispositif hydraulique de support

Country Status (7)

Country Link
US (1) US5328570A (fr)
EP (1) EP0521966B1 (fr)
JP (1) JPH05505655A (fr)
CA (1) CA2079237A1 (fr)
DE (2) DE4009628C2 (fr)
FI (1) FI923138A (fr)
WO (1) WO1991014825A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019884A1 (de) * 1990-06-22 1992-01-09 Voith Gmbh J M Leiste zur nachgiebigen stuetzung eines siebbandes
FI95935C (fi) * 1995-03-01 1996-04-10 Valmet Corp Paperikoneen vedenpoistolaitteen lista
SE505667C2 (sv) * 1996-01-09 1997-09-29 Btg Kaelle Inventing Ab Schaberhållare
FI3066U1 (fi) * 1996-06-18 1997-09-30 Valmet Corp Paperikoneen vedenpoistolaitteen listasto
USD747357S1 (en) * 2014-04-10 2016-01-12 The Singing Machine Company Inc. Karaoke machine

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2373770A (en) * 1942-05-07 1945-04-17 Martin Russell Press
US3017930A (en) * 1959-06-24 1962-01-23 Lodding Engineering Corp Adjustable supports for fourdrinier screen wires
US3187850A (en) * 1963-09-12 1965-06-08 Eaton Mfg Co Annular motor actuated drum brake mechanism
GB1345290A (en) * 1971-12-23 1974-01-30 Dunlop Ltd Inflatable seals
DE2409521C3 (de) * 1974-02-28 1979-04-26 J.M. Voith Gmbh, 7920 Heidenheim Stoff auflauf für Papiermaschinen
US4371175A (en) * 1981-08-18 1983-02-01 Keene Corporation Inflatable gasket for radio frequency shielding enclosure
US4559105A (en) * 1984-07-05 1985-12-17 Beloit Corporation Positive lock foil blades
JPH0611953B2 (ja) * 1985-09-24 1994-02-16 三菱重工業株式会社 ツインワイヤ式抄紙機の地合改善装置
DE3614302C2 (de) * 1985-11-19 1996-02-29 Voith Sulzer Papiermasch Gmbh Vorderwand mit Abstützung am Stoffauflauf einer Papiermaschine
DE3628282A1 (de) * 1986-08-20 1988-02-25 Voith Gmbh J M Stationaere stuetzvorrichtung
SE456590B (sv) * 1987-09-07 1988-10-17 Ahlstroem Valmet Anordning for styrning av viror i en pappersmaskin eller kartongmaskin
DE3927401C2 (de) * 1989-08-19 1996-02-29 Voith Gmbh J M Stoffauflauf
DE4019884A1 (de) * 1990-06-22 1992-01-09 Voith Gmbh J M Leiste zur nachgiebigen stuetzung eines siebbandes

Also Published As

Publication number Publication date
CA2079237A1 (fr) 1991-09-27
DE4009628A1 (de) 1991-10-02
FI923138A0 (fi) 1992-07-08
DE59100959D1 (de) 1994-03-10
WO1991014825A1 (fr) 1991-10-03
EP0521966A1 (fr) 1993-01-13
JPH05505655A (ja) 1993-08-19
DE4009628C2 (de) 1994-11-03
US5328570A (en) 1994-07-12
FI923138A (fi) 1992-07-08

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