EP1795649B1 - Roll for a paper machine - Google Patents
Roll for a paper machine Download PDFInfo
- Publication number
- EP1795649B1 EP1795649B1 EP06122408A EP06122408A EP1795649B1 EP 1795649 B1 EP1795649 B1 EP 1795649B1 EP 06122408 A EP06122408 A EP 06122408A EP 06122408 A EP06122408 A EP 06122408A EP 1795649 B1 EP1795649 B1 EP 1795649B1
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- EP
- European Patent Office
- Prior art keywords
- sealing strip
- pressure
- suction box
- sealing
- suction
- 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.)
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- 238000007789 sealing Methods 0.000 claims abstract description 122
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims 1
- 238000007664 blowing Methods 0.000 abstract description 6
- 230000004323 axial length Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
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
- D21F3/10—Suction rolls, e.g. couch rolls
Definitions
- the invention generally relates to a blowing or suction roll of a machine for producing and / or finishing a paper, cardboard, tissue or another material web, in particular fibrous web, with a rotatable, perforated roll shell and a pressure or suction box, with a Overpressure source or a vacuum source is connected.
- the present invention relates to a method of manufacturing a pressure or suction box for such a blowing or suction roll.
- blowing or suction rolls in paper machines.
- Such rollers have a perforated lateral surface on which zones are formed by the pressure or suction box with an overpressure or a negative pressure.
- the pressure or suction box is usually stationary, whereas the roll shell is rotated over the box.
- the former or the headbox
- the press section and the dryer section and other areas come into consideration.
- the pressure or suction boxes are usually arranged radially within the rotating roll shell over the entire or substantially the entire axial length of the roll shell and are provided with sealing strips which are pressed to seal the pressure zones or suction zones on the roll shell from the inside against the same or with be positioned at a predetermined small distance from this.
- different zones can be formed with mutually different pressures on the roll shell, which are sealed by one or more corresponding sealing strips against each other in the rule.
- the sealing surfaces of the sealing strips or the bearing surfaces of sealing surface holders, by which the sealing strips are held, for example, on the suction box and after its assembly relative to the roll shell, are conventionally carried out as flat as possible to a uniform sealing strip spacing against the inner surface of the roll shell or a uniform pressing of the sealing strips against to reach the inner surface of the roll mantle.
- This uniform spacing or the uniform contact pressure counteracts the phenomenon that with long rollers and thus correspondingly axially extending suction boxes a deflection of the suction box adjusts, which is severely limited in terms of still sufficient sealing or a maximum permissible sealing strip wear, for example seven millimeters. If the specified distance is exceeded, a uniform seal is no longer possible or the sealing strips wear out unevenly and quickly.
- a suction box for the suction cylinder of a paper machine known which is provided with fixed, arranged in the longitudinal direction sealing strips, which are in contact with the cylinder jacket, and with a side member.
- the side member is only on his. Attached ends to the suction box and carries another longitudinally disposed suction chamber, which in turn communicates with the main suction chamber, one of the boundary surfaces of this further chamber being closer to the sealing edges at the mouth of the main suction chamber is formed by a wall of the suction box itself, while the other boundary surface, which is further away from the sealing edges of the main suction chamber, is longitudinally connected to the longitudinal beam.
- a sealing device for a suction box of a suction roll known.
- axial seals are provided, which are arranged in recesses in a holding part.
- the holding member is arranged to assume a variable position with respect to the suction box and displaceable in an opening in the upper portion of the suction box.
- the invention has for its object to provide a method for producing a pressure or suction box for a paper machine roll or the like, through which said problems of bending of the printing or Suction box are overcome without significantly increasing the cost of production. Furthermore, a blow or suction roll of a paper machine or the like should be specified, which has a correspondingly produced pressure or suction box.
- suction box for a suction roll of a paper machine.
- the invention is also applicable to printing boxes for blow rolls and other machines for the production of a material web, in particular fibrous web.
- the box will hereinafter be referred to as a suction box and the roller as a suction roller, which are connected to a vacuum source.
- the inventive method is used to produce a suction box for a suction roll of a paper machine or the like, wherein the suction roll comprises a rotatable, perforated roll shell and in the mounted state, the suction box to form in the known manner, one or more suction zones on the roll shell. Accordingly, the suction box is connected to a vacuum source and associated with the roll shell so that it applies a predetermined area with a negative pressure on the inner surface of the roll shell.
- the area is sealed by at least one sealing strip, usually a plurality of sealing strips of the suction box from the inside against the roll shell, the sealing strip or the sealing strips each having / have a sealing surface which is pressed either in operation against the roll shell or with a predetermined gap distance , For example, from one to five millimeters, in particular three millimeters, is positioned relative to the inner surface of the roll shell.
- a sealing strip usually a plurality of sealing strips of the suction box from the inside against the roll shell, the sealing strip or the sealing strips each having / have a sealing surface which is pressed either in operation against the roll shell or with a predetermined gap distance , For example, from one to five millimeters, in particular three millimeters, is positioned relative to the inner surface of the roll shell.
- the inventive method is characterized in that either the sealing surface of the sealing strip and / or a bearing surface for the sealing strip on which the sealing strip during operation of the suction roll rests at least indirectly, with a convex or concave curvature along the longitudinal axis of the sealing strip and thus of the suction box and the suction roll is produced.
- a convex curvature that is, a barrel-like curvature, is always provided when the sealing strip is intended and positioned so that it is pressed from bottom to top against the roll shell or is positioned at a predetermined distance from this.
- a concave curvature is provided when the sealing strip is pressed from top to bottom against the roll shell or is positioned at a predetermined distance from this.
- the sealing strip is positioned from bottom to top at or with a gap distance from the inner surface of the roll shell, so the convex curvature of the sealing surface of the sealing strips compensates for the deflection of the suction box over its axial length, so that in Operation, the sealing surface is flat or substantially flat.
- the convex curvature can be done either by appropriate editing of the sealing surface of the sealing strip itself or by appropriate editing of the said bearing surface for the sealing strip, the sealing strip follows due to their elasticity of the convex bearing surface in shape, that is, the sealing strip bends along the convex bearing surface so she usually gets tired of this.
- the concave curvature of the sealing surface compensates for the deflection of the suction box.
- the sealing surface is again substantially or completely flat.
- the suction box in particular has a sealing strip holder, in which the described bearing surface is designed for the sealing strip.
- a sealing strip holder in which the described bearing surface is designed for the sealing strip.
- a hose which can be filled with a pressure medium and which directly bears the sealing strip on itself is positioned on the support surface.
- the tube follows the curvature in the support surface and gives this curvature, so to speak, to the sealing strip, which also follows the curvature and, even if it was previously listed with a right-angled, straight cross-section, bends accordingly, so that the sealing surface curves.
- the support surface below the tube which can be filled with air, for example, can also be designed in stages, the tube compensates for the discontinuities of the stages and the sealing strip provides a steadily curved support surface available.
- a plurality of correspondingly executed or overlying sealing strips may be provided, for example, individually or in groups targeted against the inner surface of the roll shell can be positioned or pressed to the desired concave or convex Surface of the sealing surface produce.
- the concave or convex surface in this case has a surface course with discontinuities, whereas in the previously described embodiments, the course was continuous.
- the suction roll according to the invention has a suction box with at least one sealing strip, which has a flat or substantially flat sealing surface during operation of the suction roll.
- the sealing surface shows the curvature of the invention with a curvature in the region of its axial center to the outside, that is with a convex shape , or with a curvature in the region of its axial center inwards, that is, with a concave shape.
- the expression of the curvature can be carried out according to the expected, that is the calculated or tentatively determined deflection of the suction box. If, for example, a deflection of a sealing strip holder in a suction box of 4.5 mm is expected, the sealing strip holder bearing surface, that is, the surface with which the sealing strip holder rests on the suction box, is cambered by this value (4.5 mm), so that gives a flat bearing surface during operation. Alternatively or additionally, as shown, directly the sealing surface of the sealing strip to be cambered.
- FIG. 1 In the FIG. 1 can be seen a suction roll 1 with the rotatable, perforated roll shell 2.
- the inner surface of the roll shell 2 is applied over a predetermined range by means of the suction box 3 with a negative pressure.
- the suction roll 1 is wrapped, for example, by an air-permeable belt such as a sieve or a felt and a fibrous web to be drained thereon, wherein the negative pressure region formed by the stationary suction box 3 open towards the roll shell 2 adjoins the wrapping region in the interior of the roll.
- the interior of the suction box 3 is connected to a vacuum source (not shown).
- the suction box 3 adjoins the inside of the roll mantle 2 via a sealing strip 4 held by a sealing strip holder 8, that is, either the sealing strip 4 is pressed from the inside against the roll mantle 2 or held at a predetermined distance from this surface.
- the roll shell 2 rotates over the fixed shaft 10 and is mounted for this purpose by means of the bearing 9 shown on the fixed shaft 10.
- the suction box 3 has two sealing strip holder 8, each holding a sealing strip 4 in the radial direction of the roller 1 movable.
- Each sealing strip holder 8 forms with the suction box 3, a support surface 5, on which a with a pressure medium, in particular compressed air, fillable hose 6 rests, which in turn each carries a sealing strip 4 directly.
- the sealing strip 4 is moved in the direction of the inner surface of the roll shell 2, so that it rests with its sealing surface 7 inside the roll shell 2 or positioned at a predetermined distance from the inner surface of the roll shell 2. For example, a distance between one and five millimeters, in particular of three millimeters is set.
- the bearing surface 5 has a convex surface, that is to say an outward curvature, over the longitudinal axis of the suction box 3, the highest point of the curvature being positioned centrally above the longitudinal axis of the suction box 3, and the lowest points of the bearing surface 5 respectively the two axial ends of the suction box 3 are positioned.
- Both the hoses 6 and the sealing strips 4 adapt to this curvature of the bearing surface 5, so that the sealing surface 7 of each sealing strip has a correspondingly convex shape.
- FIGS. 3 to 6 Possible embodiments of the suction box 3 or those areas with the support surface 5 and the sealing surface 7 are shown.
- the bearing surface 5 convexly curved over the longitudinal axis, wherein at the same time to achieve a uniform distribution of stress, and the sealing surface 7 of the sealing strip 4 is convexly curved.
- the sealing strip 4 without the hose 6 and the sealing strip holder 8 is again shown in FIG. 7 immediately after its production.
- this sealing strip 4 has a concave base 11, with which it, in particular with the interposition of a tube 6, rests on the convex bearing surface 5.
- the sealing surface 7 is convex over the longitudinal axis of the sealing strip 4.
- the sealing strip 4 shown there although a convex sealing surface 7 has a flat base 11 immediately after its production.
- This base 11 can be placed either on a flat shaped support surface 5 or a convex shaped support 5, in the latter case, the sealing strip 4 bends accordingly and increases the convexity of the sealing surface 7 relative to the state shown.
- FIG. 6 an example of a stepped bearing surface 5 of a sealing strip holder 8 is shown.
- a sealing strip 4 can be placed directly according to an embodiment.
- This sealing strip 4, for example, in the FIG. 4 or in the FIG. 5 have shown shape, or even, for example, a rectangular cross-sectional shape. Due to the design results either by a bend of the sealing strip 4, the desired convex shaped sealing surface 7, or the sealing strip 4 additionally or alternatively, a convex shaped base 11 on.
- a tube 6 is placed, which in turn carries a sealing strip 4.
- the tube 6 causes the stepped support surface 5 is converted into a continuously curved direct support surface for the sealing strip 4 or "steamed".
Landscapes
- Paper (AREA)
- Making Paper Articles (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Unwinding Webs (AREA)
- Replacement Of Web Rolls (AREA)
Abstract
Description
Die Erfindung betrifft allgemein eine Blas- oder Saugwalze einer Maschine zur Herstellung und/oder Veredlung einer Papier-, Karton-, Tissue- oder einer anderen Materialbahn, insbesondere Faserstoffbahn, mit einem rotierbaren, perforierten Walzenmantel und einem Druck- oder Saugkasten, der mit einer Überdruckquelle beziehungsweise einer Unterdruckquelle verbunden ist. Insbesondere betrifft die vorliegende Erfindung ein Verfahren zum Herstellen eines Druck- oder Saugkastens für eine solche Blas- oder Saugwalze.The invention generally relates to a blowing or suction roll of a machine for producing and / or finishing a paper, cardboard, tissue or another material web, in particular fibrous web, with a rotatable, perforated roll shell and a pressure or suction box, with a Overpressure source or a vacuum source is connected. In particular, the present invention relates to a method of manufacturing a pressure or suction box for such a blowing or suction roll.
Die Verwendung von Blas- oder Saugwalzen in Papiermaschinen ist bekannt. Solche Walzen weisen eine perforierte Mantelfläche auf, auf welcher durch den Druck- oder Saugkasten Zonen mit einem Überdruck oder einem Unterdruck ausgebildet werden. Dabei ist der Druck- oder Saugkasten in der Regel stationär, wohingegen der Walzenmantel über dem Kasten gedreht wird. Als Einsatzgebiet für solche Walzen in einer Papiermaschine kommen die Formerpartie (oder der Stoffauflauf), die Pressenpartie und die Trockenpartie sowie andere Bereiche in Betracht.The use of blowing or suction rolls in paper machines is known. Such rollers have a perforated lateral surface on which zones are formed by the pressure or suction box with an overpressure or a negative pressure. In this case, the pressure or suction box is usually stationary, whereas the roll shell is rotated over the box. As a field of application for such rolls in a paper machine, the former (or the headbox), the press section and the dryer section and other areas come into consideration.
Die Druck- oder Saugkästen werden in der Regel radial innerhalb des rotierenden Walzenmantels über der gesamten oder im wesentlichen der gesamten axialen Länge des Walzenmantels angeordnet und sind mit Dichtleisten versehen, welche zur Abdichtung der Druckzonen oder Saugzonen auf dem Walzenmantel von innen gegen denselben gepresst oder mit einem vorgegebenen geringen Abstand gegenüber diesem positioniert werden. Dabei können verschiedene Zonen mit zueinander verschiedenen Drücken auf dem Walzenmantel ausgebildet werden, welche in der Regel durch jeweils eine oder mehrere entsprechende Dichtleisten gegeneinander abgedichtet sind.The pressure or suction boxes are usually arranged radially within the rotating roll shell over the entire or substantially the entire axial length of the roll shell and are provided with sealing strips which are pressed to seal the pressure zones or suction zones on the roll shell from the inside against the same or with be positioned at a predetermined small distance from this. In this case, different zones can be formed with mutually different pressures on the roll shell, which are sealed by one or more corresponding sealing strips against each other in the rule.
Die Dichtflächen der Dichtleisten beziehungsweise die Auflageflächen von Dichtflächenhaltern, durch welche die Dichtleisten beispielsweise am Saugkasten und nach dessen Montage gegenüber dem Walzenmantel gehalten werden, werden herkömmlich möglichst eben ausgeführt, um einen gleichmäßigen Dichtleistenabstand gegenüber der inneren Oberfläche des Walzenmantels beziehungsweise ein gleichmäßiges Anpressen der Dichtleisten gegen die innere Oberfläche des Walzenmantels zu erreichen. Diesem gleichmäßigen Beabstanden beziehungsweise der gleichmäßigen Anpressung steht das Phänomen entgegen, dass sich bei langen Walzen und dadurch entsprechend in Axialrichtung lang ausgeführten Saugkästen eine Durchbiegung des Saugkastens einstellt, welche im Hinblick auf eine noch ausreichende Abdichtung beziehungsweise einen maximal zulässigen Dichtleistenverschleiß stark begrenzt ist, beispielsweise auf sieben Millimeter. Wenn der vorgegebene Abstand überschritten wird, ist eine gleichmäßige Abdichtung nicht mehr möglich beziehungsweise die Dichtleisten verschleißen ungleichmäßig und rasch.The sealing surfaces of the sealing strips or the bearing surfaces of sealing surface holders, by which the sealing strips are held, for example, on the suction box and after its assembly relative to the roll shell, are conventionally carried out as flat as possible to a uniform sealing strip spacing against the inner surface of the roll shell or a uniform pressing of the sealing strips against to reach the inner surface of the roll mantle. This uniform spacing or the uniform contact pressure counteracts the phenomenon that with long rollers and thus correspondingly axially extending suction boxes a deflection of the suction box adjusts, which is severely limited in terms of still sufficient sealing or a maximum permissible sealing strip wear, for example seven millimeters. If the specified distance is exceeded, a uniform seal is no longer possible or the sealing strips wear out unevenly and quickly.
Aufgrund der vorgegebenen maximalen Durchbiegung des Saugkastens (oder Druckkastens) ist es bei manchen Walzentypen mit vergleichsweise großer axialer Erstreckung notwendig, die Walzen mit einem größeren Walzendurchmesser auszuführen, um einen entsprechend massiven Saugkasten innerhalb von diesen montieren zu können. Eine solche Vergrößerung des Walzendurchmessers bringt höhere Kosten mit sich, was unerwünscht ist.Due to the predetermined maximum deflection of the suction box (or pressure box), it is necessary for some types of rolls with a comparatively large axial extent to perform the rolls with a larger roll diameter in order to mount a correspondingly massive suction box within them. Such an increase in the roll diameter entails higher costs, which is undesirable.
Zur Verhinderung des Durchbiegens solcher Saugkästen ist bereits vorgeschlagen worden, unterhalb von den Saugkästen zusätzlich einen versteifenden Träger einzusetzen, welcher beispielsweise über Distanzstücke von unten gegen den Saugkasten drückt und somit ein Durchbiegen desselben verhindert. Ein solcher Stützträger erhöht jedoch den Montageaufwand und die Herstellungskosten und verändert zudem das Schwingungsverhalten des Saugkastens.To prevent the sagging of such suction boxes has already been proposed, in addition to use a stiffening support below the suction boxes, which presses for example via spacers from below against the suction box and thus prevents the same from bending. However, such a support beam increases the assembly costs and the manufacturing cost and also changes the vibration behavior of the suction box.
Beispielsweise ist aus der
Weiterhin ist aus der
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Herstellen eines Druck- oder Saugkastens für eine Papiermaschinenwalze oder dergleichen anzugeben, durch welches die genannten Probleme des Durchbiegens des Druck- oder Saugkastens überwunden werden, ohne die Produktionskosten wesentlich zu erhöhen. Ferner soll eine Blas- oder Saugwalze einer Papiermaschine oder dergleichen angegeben werden, welche einen entsprechend hergestellten Druck- oder Saugkasten aufweist.The invention has for its object to provide a method for producing a pressure or suction box for a paper machine roll or the like, through which said problems of bending of the printing or Suction box are overcome without significantly increasing the cost of production. Furthermore, a blow or suction roll of a paper machine or the like should be specified, which has a correspondingly produced pressure or suction box.
Die erfindungsgemäße Aufgabe wird durch ein Verfahren mit den Merkmalen von Anspruch 1 und eine Blas- oder Saugwalze mit den Merkmalen von Anspruch 6 gelöst. Gegenstand der abhängigen Ansprüche sind vorteilhafte und besonders zweckmäßige Ausgestaltungen der Erfindung.The object of the invention is achieved by a method having the features of
Die Erfindung soll nachfolgend anhand des Beispiels eines Saugkastens für eine Saugwalze einer Papiermaschine erläutert werden. Die Erfindung ist jedoch auch bei Druckkästen für Blaswalzen und bei anderen Maschinen zur Herstellung von einer Materialbahn, insbesondere Faserstoffbahn, anwendbar. Zum leichteren Verständnis wird jedoch im folgenden der Kasten als Saugkasten und die Walze als Saugwalze bezeichnet, welche an eine Unterdruckquelle angeschlossen sind.The invention will be explained below with reference to the example of a suction box for a suction roll of a paper machine. However, the invention is also applicable to printing boxes for blow rolls and other machines for the production of a material web, in particular fibrous web. For ease of understanding, however, the box will hereinafter be referred to as a suction box and the roller as a suction roller, which are connected to a vacuum source.
Das erfindungsgemäße Verfahren dient dem Herstellen eines Saugkastens für eine Saugwalze einer Papiermaschine oder dergleichen, wobei die Saugwalze einen rotierbaren, perforierten Walzenmantel und im montierten Zustand den Saugkasten umfasst, um auf die bekannte Art, eine oder mehrere Saugzonen auf dem Walzenmantel auszubilden. Dementsprechend ist der Saugkasten mit einer Unterdruckquelle verbunden und dem Walzenmantel derart zugeordnet, dass er auf die innere Oberfläche des Walzenmantels einen vorgegebenen Bereich mit einem Unterdruck aufbringt. Der Bereich wird durch wenigstens eine Dichtleiste, in der Regel mehrere Dichtleisten, des Saugkastens von innen gegen den Walzenmantel abgedichtet, wobei die Dichtleiste oder die Dichtleisten jeweils eine Dichtfläche aufweist/aufweisen, welche entweder im Betrieb gegen den Walzenmantel gepresst wird oder mit einem vorgegebenen Spaltabstand, beispielsweise von einem bis fünf Millimeter, insbesondere drei Millimeter, gegenüber der inneren Oberfläche des Walzenmantels positioniert wird.The inventive method is used to produce a suction box for a suction roll of a paper machine or the like, wherein the suction roll comprises a rotatable, perforated roll shell and in the mounted state, the suction box to form in the known manner, one or more suction zones on the roll shell. Accordingly, the suction box is connected to a vacuum source and associated with the roll shell so that it applies a predetermined area with a negative pressure on the inner surface of the roll shell. The area is sealed by at least one sealing strip, usually a plurality of sealing strips of the suction box from the inside against the roll shell, the sealing strip or the sealing strips each having / have a sealing surface which is pressed either in operation against the roll shell or with a predetermined gap distance , For example, from one to five millimeters, in particular three millimeters, is positioned relative to the inner surface of the roll shell.
Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass entweder die Dichtfläche der Dichtleiste und/oder eine Auflagefläche für die Dichtleiste, auf welcher die Dichtleiste im Betrieb der Saugwalze zumindest mittelbar aufliegt, mit einer konvexen oder konkaven Krümmung entlang der Längsachse der Dichtleiste und damit des Saugkastens und der Saugwalze hergestellt wird. Eine konvexe Krümmung, das heißt eine fassartige Krümmung, wird immer dann vorgesehen, wenn die Dichtleiste dazu bestimmt und positioniert ist, dass sie von unten nach oben gegen den Walzenmantel gepresst wird beziehungsweise mit einem vorgegebenen Abstand gegenüber diesem positioniert wird. Eine konkave Krümmung hingegen wird vorgesehen, wenn die Dichtleiste von oben nach unten gegen den Walzenmantel gepresst wird beziehungsweise mit einem vorgegebenen Abstand gegenüber diesem positioniert wird.The inventive method is characterized in that either the sealing surface of the sealing strip and / or a bearing surface for the sealing strip on which the sealing strip during operation of the suction roll rests at least indirectly, with a convex or concave curvature along the longitudinal axis of the sealing strip and thus of the suction box and the suction roll is produced. A convex curvature, that is, a barrel-like curvature, is always provided when the sealing strip is intended and positioned so that it is pressed from bottom to top against the roll shell or is positioned at a predetermined distance from this. A concave curvature, however, is provided when the sealing strip is pressed from top to bottom against the roll shell or is positioned at a predetermined distance from this.
Dies hat den folgenden Hintergrund: Wenn die Dichtleiste von unten nach oben an der oder mit einem Spaltabstand gegenüber der inneren Oberfläche des Walzenmantels positioniert wird, so gleicht die konvexe Krümmung der Dichtfläche der Dichtleisten die Durchbiegung des Saugkastens über seiner axialen Länge aus, so dass im Betrieb die Dichtfläche eben oder im wesentlichen eben ist. Dabei kann die konvexe Krümmung entweder durch entsprechendes Bearbeiten der Dichtfläche der Dichtleiste selbst oder durch entsprechendes Bearbeiten der genannten Auflagefläche für die Dichtleiste erfolgen, wobei die Dichtleiste aufgrund ihrer Elastizität der konvexen Auflagefläche in ihrer Form folgt, das heißt die Dichtleiste biegt sich entlang der konvexen Auflagefläche, so dass sie auf dieser in der Regel satt aufliegt.This has the following background: If the sealing strip is positioned from bottom to top at or with a gap distance from the inner surface of the roll shell, so the convex curvature of the sealing surface of the sealing strips compensates for the deflection of the suction box over its axial length, so that in Operation, the sealing surface is flat or substantially flat. In this case, the convex curvature can be done either by appropriate editing of the sealing surface of the sealing strip itself or by appropriate editing of the said bearing surface for the sealing strip, the sealing strip follows due to their elasticity of the convex bearing surface in shape, that is, the sealing strip bends along the convex bearing surface so she usually gets tired of this.
Umgekehrt, wenn die Dichtleiste von oben nach unten gegenüber der inneren Oberfläche des Walzenmantels positioniert wird, so gleicht die konkave Krümmung der Dichtfläche die Durchbiegung des Saugkastens aus. Im Betrieb ist die Dichtfläche wiederum im wesentlichen oder vollständig eben. Für die Herstellung der konkaven Krümmung gelten die Ausführungen zu der konvexen Krümmung entsprechend.Conversely, if the sealing strip is positioned from top to bottom opposite the inner surface of the roll shell, the concave curvature of the sealing surface compensates for the deflection of the suction box. In operation, the sealing surface is again substantially or completely flat. For the production of the concave curvature, the statements on the convex curvature apply accordingly.
Der Saugkasten weist insbesondere einen Dichtleistenhalter auf, in welchem die beschriebene Auflagefläche für die Dichtleiste ausgeführt ist. Beispielsweise ist auf der Auflagefläche ein mit einem Druckmedium befüllbarer Schlauch positioniert, welcher die Dichtleiste unmittelbar auf sich trägt. Der Schlauch folgt der Krümmung in der Auflagefläche und gibt diese Krümmung sozusagen an die Dichtleiste weiter, welche dadurch der Krümmung ebenfalls folgt und, auch wenn sie zuvor mit einem rechtwinkligen, geraden Querschnitt aufgeführt wurde, sich entsprechend durchbiegt, so dass die Dichtfläche sich krümmt.The suction box in particular has a sealing strip holder, in which the described bearing surface is designed for the sealing strip. For example, a hose which can be filled with a pressure medium and which directly bears the sealing strip on itself is positioned on the support surface. The tube follows the curvature in the support surface and gives this curvature, so to speak, to the sealing strip, which also follows the curvature and, even if it was previously listed with a right-angled, straight cross-section, bends accordingly, so that the sealing surface curves.
Die Auflagefläche unterhalb des Schlauches, der beispielsweise mit Luft befüllt werden kann, kann dabei auch stufig ausgeführt sein, wobei der Schlauch die Unstetigkeiten der Stufen ausgleicht und der Dichtleiste eine stetig gekrümmte Auflagefläche zur Verfügung stellt.The support surface below the tube, which can be filled with air, for example, can also be designed in stages, the tube compensates for the discontinuities of the stages and the sealing strip provides a steadily curved support surface available.
Entlang der Längsachse des Saugkastens und der Saugwalze und selbstverständlich auch entlang des Umfangs der Saugwalze können eine Vielzahl von entsprechend ausgeführten beziehungsweise aufliegenden Dichtleisten vorgesehen sein, die beispielsweise einzeln oder gruppenweise gezielt gegenüber der Innenfläche des Walzenmantels positionierbar oder anpressbar sind, um die gewünschte konkave oder konvexe Oberfläche der Dichtfläche herzustellen. Die konkave oder konvexe Oberfläche weist in diesem Fall einen Oberflächenverlauf mit Sprungstellen auf, wohingegen in den bisher beschriebenen Ausführungen der Verlauf stetig war.Along the longitudinal axis of the suction box and the suction roll and of course along the circumference of the suction roll, a plurality of correspondingly executed or overlying sealing strips may be provided, for example, individually or in groups targeted against the inner surface of the roll shell can be positioned or pressed to the desired concave or convex Surface of the sealing surface produce. The concave or convex surface in this case has a surface course with discontinuities, whereas in the previously described embodiments, the course was continuous.
Die erfindungsgemäße Saugwalze weist einen Saugkasten mit wenigstens einer Dichtleiste auf, die im Betrieb der Saugwalze eine ebene oder im wesentlichen ebene Dichtfläche hat. Wenn jedoch eine Durchbiegung des Saugkastens dadurch vermieden wird, dass der Saugkasten im wesentlichen vollflächig oder vollständig flächig auf eine ebene Unterlage aufgelegt wird, so zeigt die Dichtfläche die erfindungsgemäße Krümmung mit einer Wölbung im Bereich ihrer axialen Mitte nach außen, das heißt mit einer konvexen Form, oder mit einer Wölbung im Bereich ihrer axialen Mitte nach innen, das heißt mit einer konkaven Form.The suction roll according to the invention has a suction box with at least one sealing strip, which has a flat or substantially flat sealing surface during operation of the suction roll. However, if a deflection of the suction box is avoided in that the suction box is placed substantially over the entire surface or completely flat on a flat surface, the sealing surface shows the curvature of the invention with a curvature in the region of its axial center to the outside, that is with a convex shape , or with a curvature in the region of its axial center inwards, that is, with a concave shape.
Die Ausprägung der Wölbung kann entsprechend der erwarteten, das heißt der berechneten oder versuchsweise ermittelten Durchbiegung des Saugkastens ausgeführt werden. Wenn zum Beispiel eine Durchbiegung eines Dichtleistenhalters in einem Saugkasten von 4,5 mm erwartet wird, wird die Dichtleistenhalterauflagefläche, das heißt jene Fläche, mit welcher der Dichtleistenhalter auf dem Saugkasten aufliegt, um diesen Wert (4,5 mm) bombiert, so dass sich im Betrieb eine ebene Auflagefläche ergibt. Alternativ oder zusätzlich kann, wie dargestellt, unmittelbar die Dichtfläche der Dichtleiste bombiert werden.The expression of the curvature can be carried out according to the expected, that is the calculated or tentatively determined deflection of the suction box. If, for example, a deflection of a sealing strip holder in a suction box of 4.5 mm is expected, the sealing strip holder bearing surface, that is, the surface with which the sealing strip holder rests on the suction box, is cambered by this value (4.5 mm), so that gives a flat bearing surface during operation. Alternatively or additionally, as shown, directly the sealing surface of the sealing strip to be cambered.
Die Erfindung soll nachfolgend exemplarisch anhand der Figuren erläutert werden.The invention will be explained below by way of example with reference to the figures.
Es zeigen:
Figur 1- einen Längsschnitt durch eine Saugwalze;
Figur 2- einen Axialschnitt durch die Saugwalze aus der
;Figur 1 Figur 3- eine schematische Darstellung einer konvexen Auflagefläche eines Dichtleistenhalters auf dem Saugkasten;
Figur 4- eine Dichtleiste mit einer konvexen Dichtfläche;
Figur 5- eine Dichtleiste mit einer konvexen Dichtfläche und zugleich einer konvexen Auflagefläche;
Figur 6- eine gestufte Auflagefläche für eine Dichtleiste.
- FIG. 1
- a longitudinal section through a suction roll;
- FIG. 2
- an axial section through the suction roll from the
FIG. 1 ; - FIG. 3
- a schematic representation of a convex bearing surface of a sealing strip holder on the suction box;
- FIG. 4
- a sealing strip with a convex sealing surface;
- FIG. 5
- a sealing strip with a convex sealing surface and at the same time a convex bearing surface;
- FIG. 6
- a stepped bearing surface for a sealing strip.
In der
Die Saugwalze 1 wird beispielsweise von einem luftdurchlässigen Band wie einem Sieb oder einem Filz und einer daraufliegenden, zu entwässernden Faserstoffbahn umschlungen, wobei der von dem zum Walzenmantel 2 hin offenen, feststehenden Saugkasten 3 gebildete Unterdruckbereich im Walzeninneren an den Umschlingungsbereich angrenzt. Hierzu ist das Innere des Saugkastens 3 mit einer Unterdruckquelle (nicht gezeigt) verbunden. Der Saugkasten 3 grenzt über eine von einem Dichtleistenhalter 8 gehaltene Dichtleiste 4 an die Innenseite des Walzenmantels 2 an, das heißt entweder wird die Dichtleiste 4 von innen gegen den Walzenmantel 2 gepresst oder mit einem vorgegebenen Abstand gegenüber dieser Fläche gehalten.The
Der Walzenmantel 2 dreht sich über der feststehenden Welle 10 und ist hierzu mittels der gezeigten Lager 9 auf der feststehenden Welle 10 gelagert.The
Wie man insbesondere in der
Um ein Durchbiegen des Saugkastens 3 zu kompensieren, weist, wie in der
In den
In der
In der
Vorteilhaft wird jedoch auf die in der
Claims (6)
- Method for producing a pressure or suction box (3) for a blower or suction roll (1) for a machine for producing and/or finishing a paper, board, tissue or other material web, the roll, when mounted, comprising a rotatable perforated roll shell (2) and the pressure or suction box (3), and the pressure or suction box (3) being connected to a vacuum source or positive pressure source in such a way that it applies a vacuum or positive pressure to the inner surface of the roll shell (2), and
the pressure or suction box (3) comprising at least one sealing strip (4), which can be pressed from the inside with a sealing face (7) against the roll shell (2) or can be positioned with respect to the latter with a predefined gap spacing,
characterized in that
the sealing face (7) of the sealing strip (4) and/or a contact face (5) for the sealing strip (4), on which the sealing strip (4) is at least indirectly supported during operation of the blower or suction roll (1), is produced with a convex or concave curvature along the longitudinal axis of the pressure or suction box (3). - Method according to Claim 1, characterized in that the sealing strip (4) is mounted in the pressure or suction box (3) in the region of the upper end in such a way that the sealing strip (4) and its sealing face (7), in the mounted state in the blower or suction roll (1), are pressed from bottom to top against the inner surface of the roll shell (2) or are positioned with respect to the latter with a predefined gap spacing, and the sealing face (7) of the sealing strip (4) and/or the contact face (5) for the sealing strip (4) are/is produced with a convex curvature along the longitudinal axis of the pressure or suction box (3).
- Method according to either of Claims 1 and 2, characterized in that the sealing strip (4) is mounted on the contact face (5) with the interposition of a flexible tube (6) that can be filled with a pressurized medium, in particular compressed air.
- Method according to one of Claims 1 to 3, characterized in that in the axial direction of the pressure or suction box (3) there is mounted a large number of sealing strip segments, which can be positioned or pressed against the inner surface of the roll shell (2) individually or in groups.
- Method according to Claim 3 and in particular according to Claim 4, characterized in that the contact face (5) is made in steps, on which the flexible tube (6) is mounted in such a way that, following its inflation, it provides a concave or convex supporting surface for the sealing strip (4).
- Blower or suction roll (1) for a machine for producing and/or finishing a paper, board, tissue or other material web, having a rotatable perforated roll shell (2) and a pressure or suction box (3), the pressure or suction box (3) being connected to a vacuum source or positive pressure source in such a way that it applies a vacuum or positive pressure to the inner surface of the roll shell (2),
the pressure or suction box (3) comprising at least one sealing strip (4), which is pressed from the inside with a sealing face (7) against the roll shell (2) or can be positioned with respect to the latter with a predefined gap spacing,
characterized in that
when there is flat, substantially whole-area contact of the pressure or suction box (3) on a flat substrate, the sealing face (7) of the sealing strip (4) and/or a contact face (5) for the sealing strip (4) are/is designed to be convex or concave in the direction of the longitudinal axis of the pressure or suction box (3).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005059040A DE102005059040A1 (en) | 2005-12-10 | 2005-12-10 | Paper machine roll |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1795649A1 EP1795649A1 (en) | 2007-06-13 |
EP1795649B1 true EP1795649B1 (en) | 2010-01-13 |
Family
ID=37696462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06122408A Active EP1795649B1 (en) | 2005-12-10 | 2006-10-17 | Roll for a paper machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1795649B1 (en) |
AT (1) | ATE455206T1 (en) |
DE (2) | DE102005059040A1 (en) |
ES (1) | ES2337715T3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008002035A1 (en) | 2008-05-28 | 2009-12-03 | Voith Patent Gmbh | Suction device for use in paper or card board manufacturing machine, has suction zones produced with low pressure sources that are connected to external suction box and loaded using controllable/regulatable low pressure |
DE102008041127A1 (en) | 2008-08-08 | 2010-02-11 | Voith Patent Gmbh | Sealing system for suction roll of machine for manufacturing or processing fibrous material course, particularly paper, cardboard or tissue course, has sealing element arranged to spring element |
DE102012208811B3 (en) * | 2012-05-25 | 2013-07-11 | Voith Patent Gmbh | Sealing strip system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE961778C (en) | 1954-02-22 | 1957-04-11 | Millspaugh Ltd | Suction box for the suction cylinder of a paper machine |
US2969837A (en) * | 1958-06-10 | 1961-01-31 | Layton Greenfield Inc | Suction roll construction |
US3273492A (en) * | 1963-10-16 | 1966-09-20 | Beloit Corp | Suction roll counter-deflector |
FI103593B (en) | 1998-04-02 | 1999-07-30 | Valmet Corp | Suction roll suction box sealing structure |
-
2005
- 2005-12-10 DE DE102005059040A patent/DE102005059040A1/en not_active Withdrawn
-
2006
- 2006-10-17 AT AT06122408T patent/ATE455206T1/en active
- 2006-10-17 ES ES06122408T patent/ES2337715T3/en active Active
- 2006-10-17 EP EP06122408A patent/EP1795649B1/en active Active
- 2006-10-17 DE DE502006005904T patent/DE502006005904D1/en active Active
Also Published As
Publication number | Publication date |
---|---|
ES2337715T3 (en) | 2010-04-28 |
ATE455206T1 (en) | 2010-01-15 |
DE102005059040A1 (en) | 2007-06-14 |
DE502006005904D1 (en) | 2010-03-04 |
EP1795649A1 (en) | 2007-06-13 |
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