WO2007096488A1 - Etancheite active d'un appareil d'aspiration - Google Patents

Etancheite active d'un appareil d'aspiration Download PDF

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Publication number
WO2007096488A1
WO2007096488A1 PCT/FI2007/050110 FI2007050110W WO2007096488A1 WO 2007096488 A1 WO2007096488 A1 WO 2007096488A1 FI 2007050110 W FI2007050110 W FI 2007050110W WO 2007096488 A1 WO2007096488 A1 WO 2007096488A1
Authority
WO
WIPO (PCT)
Prior art keywords
fabric
web
sealing
moving
roll
Prior art date
Application number
PCT/FI2007/050110
Other languages
English (en)
Inventor
Olavi Savolainen
Original Assignee
Effcom Oy
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 Effcom Oy filed Critical Effcom Oy
Publication of WO2007096488A1 publication Critical patent/WO2007096488A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/168—Sealings between relatively-moving surfaces which permits material to be continuously conveyed
    • 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
    • D21F1/50—Suction boxes with rolls

Definitions

  • the invention relates to an apparatus for removing a liquid, dusty or solid substance from a moving fabric or web.
  • the invention also relates to a method for removing liquid from a wire moving in a paper machine and from a web placed on the same.
  • the invention relates to the use of an apparatus for cleaning a moving wire, felt or another fabric.
  • the conventional function of the wet end of a paper machine is based on, for example, the so-called Fourdrinier principle, by which an endless rotating wire is covered with pulp which consists of a liquid and the fibres required for paper manufacture and which is herein also called a web. Water is removed from the web at several different steps by means of devices placed under the wire and including, for example, foils and various suction boxes.
  • suction box is presented in EP 0 639 667 A1.
  • Said suction box comprises a roll rotating with the wire and having a jacket that is, for example, meshed. The roll is placed in the box under a negative pressure. Air flows through the wire and the jacket of the roll.
  • a device for producing suction in the suction box is presented in WO 99/64667 A1.
  • WO 95/07387 A1 discloses a device used for controlling a felt and a web supported on it, applying a rotating roll whose perforated jacket is permeable to air.
  • Other rolls are also known which are provided with a perforated jacket and equipped with suction by means of a separate apparatus.
  • One apparatus is disclosed in US 5,347,728.
  • a suction apparatus according to Fig. 1 is also known, by which it is possible to support a moving wire so that the friction is reduced when compared with, for example, foils.
  • a perforated rotating roll In an opening in the upper surface of the device, against the wire, a perforated rotating roll is provided, through which a negative pressure is effective on the wire.
  • the appa- ratus is used to provide a sufficient suction effect and high-capacity dewatering, wherein it can also be applied on wires with a high speed.
  • the apparatus can be used to replace suction boxes of prior art.
  • the apparatus is suitable for the removal of liquid as well as solids, for example dust, from a wire, a felt or various other fabrics which are used, for example, in a paper machine.
  • the apparatus of Fig. 1 is also applicable for the removal of dust developed during the manufacturing process of various fabrics or the like, or for the removal of liquid, dust and solids accumulated during their cleaning. Consequently, the apparatus can be used as a cleaning device or a dewatering device for removing liquid or solids from moving pulp, a web or a fabric, for example from a wire and a felt, which are sufficiently permeable to air or liquid.
  • the suction apparatus of Fig. 1 has an opening, through which the suction is effective on the wire and the web which is narrower than the wire. If the wire and the web move vigorously in the cross direction, the ends of the opening are covered to a varying extent, which will affect the negative pressure maintained inside the apparatus and makes it more difficult to maintain a uniform suction. If the opening is not sealed under the wire, the suction becomes weaker. If the suction is not constant but varies, it may have a harmful effect e.g. on those areas of the web which are located at the edges of the wire.
  • the aim of the invention is to eliminate the above-presented drawbacks of prior art.
  • the apparatus according to the invention is presented in claim 1.
  • the method according to the invention is presented in claim 14.
  • the use according to the invention is presented in claim 15.
  • the arrangement according to the invention comprises, for the suction apparatus, a sealing device that is capable of following the movement of a fabric, for example a wire, in the cross direction.
  • the function can be described as being active, because the sealing device follows the movement of the fabric in different situations.
  • the sealing device is capable of keeping the ends of the opening of the suction apparatus closed and sealed even if the fabric moved in the cross direction.
  • the sealing device is placed on the ends of the opening and glides above a roll.
  • the fabric moves the sealing device which comprises parts placed at both edges of the fabric and coupled to each other for a synchronized movement. Thanks to the invention, the full width of the fabric can be utilized more closely, wherein e.g. the web on the wire can be made wider and the quality of the web is also better than before in the edge areas, because the suction effect no longer varies.
  • the edge of the fabric is sealed against a vertical wall in the sealing device.
  • An advantage to the example of Fig. 1 is not using an inclined sealing surface under the edge of the wire.
  • the edge of the wire remains straight, wherein the full width of the wire can be utilized, and the inclined position does not affect the quality of the web, even if the wire moved in the cross direction.
  • FIG. 1 illustrates the principle of a suction apparatus according to prior art, the suction apparatus comprising a rotating roll against a moving fabric
  • Fig. 2 illustrates the principle of the suction apparatus according to the invention, the suction apparatus comprising a rotating roll against a moving fabric,
  • Fig. 3 illustrates the principle of one end part of the sealing device according to Fig. 2, and
  • Fig. 4 illustrates the operating principle of the sealing device according to Fig. 2, seen from the side.
  • the dewatering suction apparatus comprises a box-., like and sealed chamber 1 used as a basin, in which a rotating roll 2 has been placed.
  • the upper surface 1a of the box, on and against which a fabric 3 is placed, is substantially flat and typically horizontal.
  • the upper surface 1 a may also form a very gently sloping angle, the roll 2 being placed in the angular point.
  • the chamber 1 is elongated and extends preferably underneath the fabric 3, substantially over its whole length.
  • the chamber 1 is placed crosswise, primarily transversely to the travel direction of the fabric 3, in the same way as the opening 1 b in the upper surface 1a of the chamber 1.
  • the opening 1 b is uniform and continuous and extends over the full width of the fabric 3.
  • the chamber 1 is closed with end parts 1c.
  • a roll 2 is placed inside the chamber 1 and is allowed to rotate with the fabric 3.
  • the opening 1b exposes at least part of the outer jacket 2a of the roll 2 in such a way that the moving fabric 3 or web that is tangential to the chamber 1 can be supported to the outer jacket 2a.
  • the roll 2 extends slightly higher than the upper surface 1a and causes a gently sloping ridge in the fabric 3, when the wire is placed or aspirated against the outer jacket 2a.
  • the roll 2 and the upper surface 1a form a surface, against which the fabric 3 is pressed by the effect of the suction.
  • This part of the outer jacket 2a covers a sector-like part limited by beams 4 and 5 at the front and back edges of the opening 1b.
  • the exposed sector-like part encompasses about a quarter or less of the outer jacket 2a shown in Fig. 1.
  • said beams 4 and 5 at the same time, constitute the upper surface 1a and are placed as close to the roll 2 as possible.
  • the beams 4 and 5 are connected to the upper part of the chamber 1 or to supporting structures above the chamber 1.
  • the fabric 3 travels along the upper surface 1a, and the negative pressure effective on the fabric 3 removes, for example, water from the fabric 3 further into the chamber 1.
  • the roll 2 is perforated, and the suction prevailing inside it pulls the fabric 3 against the outer jacket 2a of the roll and the liquid to the inside of the roll 2 and into the chamber 1.
  • the roll 2 is arranged to rotate around a rotation axis X, and the rotation axis X is parallel with the longitudinal axis of the roll 2 and also with the opening 2a.
  • the width of the opening 2a is a fraction of the length of the roll 2 and the opening 2a.
  • the longitudinal axis is parallel with the chamber 1 and transverse to the travel direction of the fabric 3.
  • the roll 2 rotates or is rotated at a speed that corresponds to the speed of the fabric 3.
  • the roll 2 comprises the structure of a shaft 6, for example a solid shaft, appropriately mounted with bearings at its ends.
  • the ends of the shaft 6 protrude from both ends of the chamber 1 , wherein the bearings can be easily arranged outside the chamber 1.
  • the gap between the end of the chamber 1 and the shaft 6 is sealed with appropriate sealings.
  • At least one end of the shaft 6 may be connected to a separate rotating device, typically an electric motor, to rotate the roll 2 via the shaft 6.
  • the roll 2 comprises an outer jacket 2a with a circular cross-section.
  • the outer jacket 2a can be made of a sheet or, for example, as a wire- cloth that is permeable to liquid and air.
  • the outer jacket 2a may be perforated or equipped with holes or openings, through which the suction is effective on the moving fabric 3.
  • the air flow effected by the suction and passing through the fabric and the web 3 carries liquid, dust and possibly other solids that can penetrate the fabric 3 and the outer jacket 2a.
  • the ends of the upper surface 1a of the chamber 1 are provided with inclined sealing surfaces 8 which are placed partly underneath the fabric 3.
  • the fabric 3 rises from the upper surface 1a onto the sealing surface 8.
  • the sealing surfaces 8 are placed onto the roll 2, and simultaneously they cover the ends of the opening 1b.
  • the sealing surface 8 is connected to the chamber 1 or to the beams 4 and 5.
  • the sealing surface 8 is formed in a part, whose lower side conforms to the shape of the roll 2 at the opening 1 b. In Fig. 1 , said part is connected next to a cover 7 fixed on the end part 1c to close the opening 1b.
  • the sealing surface 8 and the cover may also constitute a single integrated element.
  • the chamber 1 is coupled, for example by means of a connection 9, to a separate suction system to provide a suction effect.
  • the pressure difference causes a liquid or air flow through the outer jacket 2a and simultaneously through the fabric 3 or web into the chamber 1.
  • a suction apparatus comprising an upper surface 1a that is uniformly flat or has a gently sloping angle but which suction apparatus does not comprise a roll placed in an opening.
  • the fabric 3 remains straight and flat against the upper surface 1a.
  • the upper surface 1a comprises one or more gaps or openings covering the full width of the fabric 3.
  • the upper surface 1a is provided with a dense perforation covering the full width of the fabric 3. Even in this case, suction is arranged inside the chamber 1 , effective on the fabric 3 through openings, gaps or holes, to remove liquid from the by-passing fabric 3.
  • Figure 2 shows in more detail a suction apparatus equipped with a moving sealing device according to one embodiment of the invention.
  • the numbering of the elements corresponds to the numbering in Fig. 1 , because the operating principle of the suction device of Fig. 2 corresponds primarily to the operation of the suction device of Fig. 1 ; furthermore, the same reference numerals are used for the same parts.
  • Figure 2 shows one of two sealing carriages 11 detached from a coupling 13 and apart from a bearing part 10, for better illustration and to expose the bearing part 10. In the following description, reference will be made to Figs. 2, 3 and 4.
  • the bearing parts 10 close the ends of the openings 1b, being placed at the edges of the beams 4 and 5, and they are connected e.g. on top of the end parts 1c.
  • the bearing parts 10 are also placed as close as possible to the ends of the roll 2.
  • the shape of the upper surface 18 of the bearing parts 10 corresponds to the joint shape of the upper surface 1a and the outer jacket 2a of the roll 2.
  • the upper surface of the bearing part 10 is provided with a cut grooving 12, to which a liquid is supplied, for example pressurized water, to carry the sealing carriage 11 and to act as a bearing between the bearing part 10 and the moving sealing carriage 11 , and also between the sealing carriage 11 and the beams 4, 5.
  • the water also seals the gap between the bearing part 10 and the.
  • the liquid is supplied, for example, via an inlet 14 at the end of the bearing part 10. From the inlet 14, a channel 16 extends inside the bearing part to the grooving 12.
  • the shape of the lower surface 17 of the moving sealing carriage 11 corresponds to the joint shape of the upper surface 1a and the outer surface 2a of the roll 2 so that the sealing carriage 11 can be placed sealingly onto them. Because the shapes are the same, the sealing carriage 11 can glide on the bearing part 10 and the beams 4, 5. In the example shown in Fig. 4, the sealing carriage 11 has a substantially vertical surface, against which the moving edge of the fabric 3 is sealed. When the fabric 3 moves in the cross direction, it simultaneously also pushes aside the sealing carriage 11 , wherein no gap can be formed between the fabric 3 and the sealing carriage 11. The end of the roll 2, as well as the gap between the roll 2 and the bearing part 10, are placed underneath the sealing carriage 11.
  • the roll 2 is wider than the fabric 3, so that the suction effect remains equal over the full width of the fabric 3, even though the fabric 3 moved in the lateral direction.
  • the sealing carriage 11 of Figs. 2, 3 and 4 moves under the guidance of the fabric 3, without external control or monitoring, so that, for moving the sealing carriage 11 , it will not be necessary to employ actuators for moving the sealing carriage 11 and sensors for monitoring the lateral movements of the fabric 3 and for controlling the actuators via a control unit. Because the fabric 3 can move in the lateral direction without having a negative effect on the suction, it is also unnecessary to guide the fabric 3 by preventing its lateral movement by any device preceding the suction apparatus.
  • the other sealing carriage 11 on the other side of the fabric 3 is coupled to the sealing carriage 11 that the fabric 3 forces to move.
  • a coupling 13 the sealing carriages 11 follow each other's movements, wherein no gap is formed between said second sealing carriage 11 and the fabric 3 either.
  • the coupling 13 is, for example, mechanical, comprising two bars coupled on both sides of the sealing carriage 11 and to both sealing carriages 11 :
  • the coupling 13 is placed so that it will not be hit by the fabric 3.
  • the coupling 13 may have a control function, by means of which the distance between the sealing carriages 11 can be changed as desired.
  • the coupling 13 can also be placed underneath the beams 4 and 5 or inside channels formed therein.
  • the beams 4 and 5, the bearing parts 10 and the sealing carriages 11 are made of, for example, a plastic material having good sliding properties to reduce friction.
  • an inclined sealing surface 8 according to Fig. 1 can be placed next to the sealing carriage 11 , underneath the fabric 3, the fabric 3 rising above the sealing surface 8, which is connected to the sealing carriage 11.
  • the fabric 3 pushes and moves the sealing carriage 11 , being pressed against the sealing surface 8.
  • the embodiment of Fig. 4 is more preferable, because the suction can be directed over the full width of the fabric 3.
  • the sealing carriage 11 can also be guided on the bearing part 10 and the beams 4, 5 so that the sealing carriage 11 extends over the flanks of the bearing part 10 and further underneath the bearing part 10.
  • the movement of the sealing carriage 11 is limited both in the vertical direction and in the cross direction, and the clearance between said parts can be limited as desired.
  • the sealing carriages 11 can slide freely on the suction apparatus, crosswise to the fabric 1 , and the fabric 3 is placed therebetween.
  • the above-presented principle of the invention can also be applied when the upper surface 1a is substantially flat throughout and it does not comprise a roll. Even in such a case, the shape of the upper surface 16 conforms to the upper surface 1a, and the lower surface 17 conforms to the shape of the upper surface 16 and the upper surface 1a.
  • the sealing carriage 11 covers those openings, gaps or holes in the upper surface 1a, which are not placed underneath the fabric 3.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un appareil destiné à retirer une substance liquide, pulvérulente ou solide d'un tissu ou d'une bande (3) en mouvement, le dispositif comportant au moins : une surface (1a, 2a) contre laquelle le tissu ou la bande (3) est pressé(e) par l'effet de l'aspiration ; et une ou plusieurs ouvertures, évidements ou perforations dans la surface (1a, 2a), à travers lesquel(le)s l'aspiration agit sur le tissu ou la bande (3) passant devant ladite surface (1a, 2a) ; au moins un chariot (11) d'étanchéité se déplaçant sur la surface (1a, 2a), placé près du tissu ou de la bande (3) et suivant le mouvement du tissu ou de la bande (3) dans la direction transversale, ledit chariot (11) d'étanchéité étant disposé de façon à recouvrir la partie de ladite ouverture, dudit évidement ou de ladite perforation qui n'est pas placée sous le tissu ou la bande (3). Dans un exemple, l'appareil comporte deux chariots (11) d'étanchéité entre lesquels est placé le tissu ou la bande (3) et lesdits deux chariots d'étanchéité sont joints l'un à l'autre par un accouplement (13) synchronisant leur mouvement.
PCT/FI2007/050110 2006-02-27 2007-02-27 Etancheite active d'un appareil d'aspiration WO2007096488A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20065141 2006-02-27
FI20065141A FI118546B (fi) 2006-02-27 2006-02-27 Imulaitteiston aktiivinen tiivistys

Publications (1)

Publication Number Publication Date
WO2007096488A1 true WO2007096488A1 (fr) 2007-08-30

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PCT/FI2007/050110 WO2007096488A1 (fr) 2006-02-27 2007-02-27 Etancheite active d'un appareil d'aspiration

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WO (1) WO2007096488A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105951496A (zh) * 2016-06-20 2016-09-21 许昌中亚工业智能装备股份有限公司 一种新型吸水箱

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2014927A6 (es) * 1989-09-06 1990-07-16 Garcia Pastor Francisco Prensa de succion centrifuga aplicable a la fabricacion de papel.
WO1999023296A1 (fr) * 1997-10-31 1999-05-14 Beloit Technologies, Inc. Presse a air
WO2000009914A2 (fr) * 1998-08-12 2000-02-24 Kimberly-Clark Worldwide, Inc. Systeme de reglage de fuites utile pour le traitement de bandes en mouvement
US6497789B1 (en) * 2000-06-30 2002-12-24 Kimberly-Clark Worldwide, Inc. Method for making tissue sheets on a modified conventional wet-pressed machine
FI117101B (fi) * 2005-02-24 2006-06-15 Olavi Savolainen Laitteisto nesteen poistamiseksi liikkuvasta kudoksesta tai rainasta

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2014927A6 (es) * 1989-09-06 1990-07-16 Garcia Pastor Francisco Prensa de succion centrifuga aplicable a la fabricacion de papel.
WO1999023296A1 (fr) * 1997-10-31 1999-05-14 Beloit Technologies, Inc. Presse a air
WO2000009914A2 (fr) * 1998-08-12 2000-02-24 Kimberly-Clark Worldwide, Inc. Systeme de reglage de fuites utile pour le traitement de bandes en mouvement
US6497789B1 (en) * 2000-06-30 2002-12-24 Kimberly-Clark Worldwide, Inc. Method for making tissue sheets on a modified conventional wet-pressed machine
FI117101B (fi) * 2005-02-24 2006-06-15 Olavi Savolainen Laitteisto nesteen poistamiseksi liikkuvasta kudoksesta tai rainasta

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105951496A (zh) * 2016-06-20 2016-09-21 许昌中亚工业智能装备股份有限公司 一种新型吸水箱

Also Published As

Publication number Publication date
FI20065141A (fi) 2007-08-28
FI20065141A0 (fi) 2006-02-27
FI118546B (fi) 2007-12-14

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