EP0254819A1 - Elément de support hydraulique pour presse - Google Patents

Elément de support hydraulique pour presse Download PDF

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Publication number
EP0254819A1
EP0254819A1 EP87106167A EP87106167A EP0254819A1 EP 0254819 A1 EP0254819 A1 EP 0254819A1 EP 87106167 A EP87106167 A EP 87106167A EP 87106167 A EP87106167 A EP 87106167A EP 0254819 A1 EP0254819 A1 EP 0254819A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pockets
support element
pressure pockets
web
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.)
Withdrawn
Application number
EP87106167A
Other languages
German (de)
English (en)
Inventor
Peter Dipl.-Ing. Mirsberger
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss 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 Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0254819A1 publication Critical patent/EP0254819A1/fr
Withdrawn legal-status Critical Current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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses

Definitions

  • the invention relates to a hydraulic support element for a press device, in which a web to be dewatered is guided between a rotatable roller and a flexible jacket pressed by the support element to the roller in a press nip along part of the circumference of the roller, the support element having at least one pressure medium certain pressure available pressure space is supported against a non-rotating carrier and movable in the pressing direction, and has on its pressing surface side by side several pressure pockets arranged transversely to the direction of movement of the web, which are connected to a channel with a pressure space and supplied with pressure medium.
  • Such support elements are known for example from DE-A-3 408 118 or US-A-4 570 314. They are used in particular for dewatering a material web, for example a fiber web, for example in the press section of a paper machine, or another material web that can be dewatered by exerting a pressing pressure.
  • the support element forms one by means of its pressure pockets in cooperation with the flexible jacket extended press nip which extends over part of the circumference of the counter roll. This results in a particularly good dewatering performance compared to pressing devices with a linear press nip.
  • the support element As a continuous bar, which is provided with pressure pockets on its pressing surface and on the back by means of a slot-shaped pressure chamber that extends across the width or by means of several pistons / Support cylinder units of pressure chambers formed against the carrier. From the US-A-3 748 225 the teaching can be found to choose the pressure medium pressure across the entire width or in all cylinders the same, or to apply a uniform force across the width to the back of the support element to prevent deflections to avoid.
  • the object of the invention is to eliminate the disadvantages of the prior art and to provide a support element with which a web of material can be dewatered uniformly over the entire width, including the edge parts, in a pressing device of the type mentioned at the beginning.
  • this object is achieved in that the pressure medium supply to the pressure pockets can be controlled in such a way that irrespective of the different pressure medium outflow from pressure pockets with different marginal proportions, the pressure medium pressure is at least approximately the same in all pressure pockets.
  • the invention is based on the knowledge that the cause of the uneven drainage effect across the width of the web is that the individual pressure pockets have a different edge portion on the pressing surface of the support element.
  • the pressure medium supplied from the pressure chamber flows out of the pressure pocket again over the free edges of the pressure pockets, which lead to the outside and are not adjacent to other pressure pockets.
  • With a larger edge portion of a pressure pocket for example in the case of the two pressure pockets arranged on the outside, the outflow resistance and thus the amount of pressure medium flowing out is greater than in the case of the inner pressure pockets, which have only a smaller edge fraction.
  • the pressure prevails at least approximately in all pressure pockets and the dewatering performance is thus uniform over the width of the web.
  • the two outer pressure pockets are assigned separate pressure spaces, which are supplied with a pressure medium of higher pressure than the pressure spaces assigned to the middle pressure pockets.
  • the channels which conduct pressure medium to the outer pressure pockets have a larger cross section than the channels leading to the middle pressure pockets, so that even with the same pressure medium pressure in the pressure chambers, a larger quantity of pressure medium is supplied to the outer pressure pockets , which compensates for the pressure medium losses caused by the larger edge portion.
  • separate piston / cylinder units are assigned as pressure chambers to the outer pressure pockets, the piston cross section being larger than that of the mean pressure pockets see assigned piston / cylinder units.
  • the pressure force caused by the piston is for 'the external pressure pockets greater than for the middle and compensates for the pressure drop in the pressure pockets due to the larger quantity of outflowing pressure medium via the broader marginal portions of the external pressure pockets.
  • outer pressure pockets have a smaller width than the middle pressure pockets, so that their edge portions become at least approximately the same.
  • the pressing device shown in Figure 1 consists of a roller 1, which can be designed as a solid tube or suction roller, and a flexible jacket 5, which with a support element 2, whose support surface is adapted to the shape of the roller 1, in a press nip 6 along a Part A of the roller circumference is pressed against the roller 1.
  • a fibrous web 3 for example a paper web, is combined with a water-absorbing belt 4, e.g. a felt belt in a running direction L through the press nip 6 and dewatered during the passage through the press nip, the water emerging from the web 3 being absorbed by the felt belt 4.
  • further belts for example a sieve belt, can additionally be guided through the press nip 6.
  • the flexible jacket must be deformable at least to such an extent that it can adapt to the shape of the counter roll 1 over the entire press length A. It may be expedient to design the jacket 5 as an endless flexible band.
  • the pressure device 2 arranged in the interior of the flexible jacket 5 has a hydraulic support element 11, which consists of a support shoe 30 with a rear piston 20, which is movable in a cylindrical or groove-shaped pressure chamber 12 of a non-rotatable carrier 13 in the pressing direction P and at the same time in a certain way Is tiltable against the pressing direction, so that the support shoe 30 to the counter surface, ie the surface of the roller is customizable.
  • the pressure chamber 12 is connected to a pressure medium line 14 in the carrier 13 and is connected via this with a suitable pressure medium, e.g. Oil or water, supplied with a certain pressure.
  • a suitable pressure medium e.g. Oil or water
  • the support shoe 30 has several rows of bearing pockets 15 and 16 on its pressing surface. The individual rows 15 and 16 consist of a number of pressure pockets lying next to one another transversely to the running direction L. The pressure pockets are each connected to a pressure space 12 via channels 17, 18.
  • FIG. 2 shows a further embodiment of a pressing device, the flexible jacket 5 being designed as an endless belt and being guided over several deflecting rollers 10.
  • the backing roll 1 is designed here as a so-called D urchbiegungsaus GmbHswalze as is described for example in US-A-3,802,044. It has a rotatable roller jacket 7, which is pressed in the pressing direction with a series of hydrostatic support elements 9 supported against a fixed support 8.
  • the arrangement of cylinder 12 and piston 20 is in this example reversed as in the previous one, ie the cylinders 12 are formed here on the rear side of the support element 11, while the piston 13 serves as attachments of the carrier 13.
  • a single row of pressure pockets 15 lying next to one another in the transverse direction is provided on the pressing surface of the support element 11, which are connected to the pressure spaces 12 by channels 17.
  • FIG. 3 shows a support element 11, as can be used in the pressing device according to FIG. 1, in a top view.
  • two rows 15 and 16 of adjacent pressure pockets are provided on the pressing surface of the support element 11.
  • a common piston 20 is provided for each pair of pressure pockets 15, 16, through which a bore 17 and 18 leads to each of the two pressure pockets 15 and 16.
  • All pressure pockets 15 and 16 have the same dimensions in this example.
  • the edge portions of the pressure pockets, from which pressure medium can escape from the pressure pocket to the outside, are different in the outer pressure pockets 15 1 from those of the middle pressure pockets 15 °. While in the middle pressure pocket 15 pressure medium can only escape over the width b, in the outer pressure pockets 15 1 pressure medium can also escape over their height, so that the edge portion is (b + h).
  • FIG. 4 shows this support element in longitudinal section.
  • Each pressure pocket 15 is assigned a piston / cylinder unit 20/12 and is supplied with pressure medium by the respectively assigned cylinder.
  • the individual cylinders or pressure chambers 12 are supplied with pressure medium lines provided in the carrier 13 with a pressure medium with a specific pressure.
  • the individual pressure spaces 12 can be supplied with pressure medium separately from one another with separate lines 14, or a plurality of adjacent pressure spaces can be connected to a common supply line. In the example shown, they are outer pressure chambers 12 1 and 12 2 are each connected to a separate supply line 14 1 and 14 2 , while the intermediate pressure spaces 15 0 are connected to a common supply line 14. Controllable valves 19 0 , 19 and 19 3 are provided in the three supply lines.
  • valves 19, 19 and 19 are now controlled by a control device 21 such that a higher pressure prevails in the outer pressure spaces 12 1 and 12 2 than in the middle pressure spaces 12 0 .
  • the pressure in the outer pressure pockets 15 1 and 15 2 is raised to such an extent that the pressure losses due to the greater outflow of pressure medium are compensated for by the larger edge areas in comparison to the middle pressure pockets 15. that the same pressure prevails in all pressure pockets 15, ie both outside and in the middle.
  • FIG. 5 shows another example of a support element in section, in which only the outer pressure pockets 15 1 and 15 2 are assigned separate pressure spaces 12 1 and 12 2 .
  • the middle pressure pockets 15 0 are supplied with pressure medium from a common pressure chamber 12 0 , whereby instead single piston a piston ledge 20 0 can be seen, which extends over all middle pressure pockets 15 0 .
  • the outer pressure pockets 15 1 and 15 2 have a smaller width b s than the middle pressure pockets 15 0 with a width b.
  • the widths b of the outer pressure pockets and b of the middle pressure pockets it can be achieved that the length of the edge section (h + 2 b s ) of the outer pressure pockets is at least approximately equal to the edge length 2 b m of the middle pressure pockets. In this way too, a drop in pressure in the outer pressure pockets can be avoided.
  • all pressure pockets 15 are of the same size, but the outer pressure pockets are assigned to pistons 20 1 and 20 2 with a larger cross section than the pistons 20 0 for the middle pressure pockets. Because of the larger area of the outer pistons, a greater contact pressure is exerted on the ends of the support element, whereby the lower force due to the pressure drop in the outer pressure pockets can be compensated for with suitable dimensioning of the pistons.
  • FIG. 8 shows an example in which the outer pressure pockets 15 are connected to the associated pressure spaces 12 with channels 17 1 and 17 2 are, which have a larger cross section than the channels 17 0 , with which the middle pressure pockets 15 are connected to the associated pressure chambers 12. Due to the larger cross-section of the outer channels 17 1 and 17 2 , a larger amount of pressure medium is subsequently delivered to the outer pressure pockets, so that the larger quantity of pressure medium escaping over the edge area is replaced and compensated for and the pressure in the outer pressure pockets does not drop and remains at the same level as for the middle pressure pockets 15.

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  • Paper (AREA)
EP87106167A 1986-06-20 1987-04-28 Elément de support hydraulique pour presse Withdrawn EP0254819A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH250786A CH670217A5 (fr) 1986-06-20 1986-06-20
CH2507/86 1986-06-20

Publications (1)

Publication Number Publication Date
EP0254819A1 true EP0254819A1 (fr) 1988-02-03

Family

ID=4235348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106167A Withdrawn EP0254819A1 (fr) 1986-06-20 1987-04-28 Elément de support hydraulique pour presse

Country Status (5)

Country Link
EP (1) EP0254819A1 (fr)
JP (1) JPS632598A (fr)
CH (1) CH670217A5 (fr)
DE (1) DE3631450A1 (fr)
FI (1) FI872632A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4917768A (en) * 1988-05-25 1990-04-17 Valmet Paper Machinery, Inc. Press with extended nip
US4917767A (en) * 1988-05-25 1990-04-17 Valmet Paper Machinery, Inc. Press with extended nip
WO1991005913A1 (fr) * 1989-10-11 1991-05-02 Sulzer-Escher Wyss Gmbh Calandre
EP0449390A2 (fr) * 1987-02-23 1991-10-02 Valmet Paper Machinery Inc. Procédé et appareil pour le contrôle de la distribution de la pression appliquée sur une bande de matériaux
WO1995033885A1 (fr) * 1994-06-03 1995-12-14 Valmet Paper Machinery Inc. Pre-presse pour une bande de papier
EP0812953A1 (fr) * 1996-05-31 1997-12-17 Voith Sulzer Papiermaschinen GmbH Patin de pressage
US5753083A (en) * 1995-06-27 1998-05-19 Voith Sulzer Papiermaschinen Gmbh Hydraulic support arrangement for a shoe press device
CN105189864A (zh) * 2013-05-09 2015-12-23 托斯克科技股份公司 靴型压榨机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613878C1 (de) * 1996-04-06 1997-06-12 Voith Sulzer Finishing Gmbh Kalander für Papier o. dgl.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH560334A5 (en) * 1971-06-28 1975-03-27 Escher Wyss Ag Paper roller pressure compensation system - has divided pressure zones with throttle valves linked to a pressure source
FR2360713A1 (fr) * 1975-12-08 1978-03-03 Escher Wyss Sa Procede et dispositif de reglage de la force de serrage d'un laminoir
DE3408119A1 (de) * 1984-02-06 1985-08-14 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Nasspresse zum entwaessern einer faserbahn
DE3408118A1 (de) * 1984-02-06 1985-08-14 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Nasspresse zum entwaessern einer faserbahn
US4570314A (en) * 1981-06-24 1986-02-18 Escher Wyss Aktiengesellschaft Press roll

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2230139B2 (de) * 1971-06-28 1980-01-31 Escher Wyss Ag, Zuerich (Schweiz) Walze mit Durchbiegungsausgleich für die Druckbehandlung von bahnförmigen Materialien
DE3101115C2 (de) * 1981-01-15 1983-06-16 Escher Wyss AG, Zürich Durchbiegungseinstellwalze mit Steueranordnung
AT376465B (de) * 1981-05-06 1984-11-26 Escher Wyss Ag Walze fuer eine walzvorrichtung
DE3128722C2 (de) * 1981-07-21 1985-05-15 Eduard 4150 Krefeld Küsters Durchbiegungssteuerbare Walze
US4480537A (en) * 1983-07-25 1984-11-06 Agronin Ronald D Method and apparatus for calendering a web
DE3416210C3 (de) * 1984-05-02 1994-07-14 Kleinewefers Gmbh Walzenpresse für Papier- und ähnliche Bahnen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH560334A5 (en) * 1971-06-28 1975-03-27 Escher Wyss Ag Paper roller pressure compensation system - has divided pressure zones with throttle valves linked to a pressure source
FR2360713A1 (fr) * 1975-12-08 1978-03-03 Escher Wyss Sa Procede et dispositif de reglage de la force de serrage d'un laminoir
US4570314A (en) * 1981-06-24 1986-02-18 Escher Wyss Aktiengesellschaft Press roll
DE3408119A1 (de) * 1984-02-06 1985-08-14 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Nasspresse zum entwaessern einer faserbahn
DE3408118A1 (de) * 1984-02-06 1985-08-14 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Nasspresse zum entwaessern einer faserbahn

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449390A2 (fr) * 1987-02-23 1991-10-02 Valmet Paper Machinery Inc. Procédé et appareil pour le contrôle de la distribution de la pression appliquée sur une bande de matériaux
EP0449390A3 (en) * 1987-02-23 1992-07-08 Valmet Paper Machinery Inc. Method and equipment for the control of the distribution of pressure load applied to a material web
US4917768A (en) * 1988-05-25 1990-04-17 Valmet Paper Machinery, Inc. Press with extended nip
US4917767A (en) * 1988-05-25 1990-04-17 Valmet Paper Machinery, Inc. Press with extended nip
WO1991005913A1 (fr) * 1989-10-11 1991-05-02 Sulzer-Escher Wyss Gmbh Calandre
WO1995033885A1 (fr) * 1994-06-03 1995-12-14 Valmet Paper Machinery Inc. Pre-presse pour une bande de papier
US5753083A (en) * 1995-06-27 1998-05-19 Voith Sulzer Papiermaschinen Gmbh Hydraulic support arrangement for a shoe press device
EP0812953A1 (fr) * 1996-05-31 1997-12-17 Voith Sulzer Papiermaschinen GmbH Patin de pressage
US5925219A (en) * 1996-05-31 1999-07-20 Voith Sulzer Papiermaschinen Gmbh Shoe press with stop
CN105189864A (zh) * 2013-05-09 2015-12-23 托斯克科技股份公司 靴型压榨机

Also Published As

Publication number Publication date
JPS632598A (ja) 1988-01-07
DE3631450A1 (de) 1987-12-23
FI872632A0 (fi) 1987-06-12
FI872632A (fi) 1987-12-21
CH670217A5 (fr) 1989-05-31

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Inventor name: MIRSBERGER, PETER, DIPL.-ING.