EP1882776B1 - Doctor blade support - Google Patents

Doctor blade support Download PDF

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Publication number
EP1882776B1
EP1882776B1 EP07112909A EP07112909A EP1882776B1 EP 1882776 B1 EP1882776 B1 EP 1882776B1 EP 07112909 A EP07112909 A EP 07112909A EP 07112909 A EP07112909 A EP 07112909A EP 1882776 B1 EP1882776 B1 EP 1882776B1
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EP
European Patent Office
Prior art keywords
doctor
doctor holder
moulded parts
blade
holder
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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.)
Not-in-force
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EP07112909A
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German (de)
French (fr)
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EP1882776A1 (en
Inventor
Christoph Link
Andreas Meschenmoser
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1882776A1 publication Critical patent/EP1882776A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes

Definitions

  • the invention relates to a scraper holder with a scraper blade for keeping clean a roller and / or a cylinder of a manufacturing machine for a paper, cardboard or other fibrous web, the scraper holder in its overall width and the doctor blade substantially to the length of the roller and / or is adapted to the cylinder, according to the preamble of the present claim 1.
  • the object of the present invention is to provide a scraper holder which on the one hand is easier to produce and on the other hand can be adapted more easily to the respective length of the peripheral surface of a roller and / or cylinder to be cleaned.
  • each molding each only has a width between 10 and 100 mm, preferably 25 to 40mm.
  • Such parts can, as I said, much easier to produce and handle and can also stockpile.
  • the modular juxtaposition of the moldings can be produced in a fairly simple manner any lengths of scraper holders.
  • the single molded part consists of a single component, which has a slightly curved elastic front wall, a molded on the lower end of the front wall rigid rear wall and a support member.
  • the support member is located above the rear wall and is also formed on the front wall. Between the front and rear wall there is a gap which at its lower part, where the molded-on rear wall branches off from the front wall by 180 ° upwards so to speak, with a rounding, i. a radius is provided and acts as an elastic joint.
  • the scraper holder according to the invention thus created is designed such that it holds a continuous wide doctor blade (which can easily exceed the 10m limit in modern machines) like a pair of pliers and can absorb their forces. About the elasticity and deformation of the doctor blade is applied with its blade tip against the respective roller and / or the respective cylinder, resulting in only small changes in angle with wear of the applied doctor blade.
  • modules or molded plastic parts can be produced by injection molding. These are in addition to their corrosion resistance and relatively inexpensive. A version in light metal is also conceivable.
  • the molding is made in one piece.
  • An expedient solution also consists in that the individual molded parts each have an insert with laterally raised contact surfaces, via which the molded parts can be connected to one another.
  • the direct contact surfaces are limited to a small defined area. Between the individual contact surfaces in the assembled state of the molded parts, a distance of 0.01 to 1 mm is provided. It is also proposed to form the contact surfaces with 0.005 to 0.5 mm with respect to the side surfaces of the moldings sublime.
  • tie rods are provided.
  • Tie rods are known per se. According to the invention, they are manufactured in a length which corresponds at least to the total width of the scraper holder to be created.
  • These tie rods can be made of a carbon fiber plastic (CFRP).
  • One way of connecting or juxtaposing the individual moldings can be done via a click system according to the known tongue and groove principle or there are connecting elements, such as elastomeric tongues, leaflets or strips (eg made of plastic or rubber) provided. In all cases, however, a sealing function towards the outside, opposite To ensure dirt particles and moisture.
  • the scraper holder according to the invention over its entire width away receives a single continuous pressure hose, the loaded in the, i. when the pressure in the hose is increased, via a molded support member, the front wall on the rigid rear wall pulls up and thus presses the doctor blade against the relevant beschabernde roller or cylinder in question. In this case, a part of the front wall is deformed.
  • the release of the inserted doctor blade is possible, but at least achieved a distance of the blade tip to the roller or to the cylinder.
  • the advantage of the invention is that the commercial pressure hose positioned between the support surfaces of the rear wall and the T-shaped support member only has to overcome the free spring travel and generate the necessary force for the blade load.
  • the pressure hose is disposed within the mold parts so that it sits relatively close to the doctor blade tip. As a result, he can act without much leverage. More specifically, the pressure hose should be between a fulcrum and blade support points. He should be closer to a Klingenabstütztician than at the fulcrum or the said elastically acting hinge point of the scraper holder.
  • the contact points ie blade support points
  • embedded or clipped steel wires are suitable.
  • the doctor blade can be so without overstressing joints Push.
  • a stroke limitation can be integrated into the scraper holder profile or the individual moldings.
  • FIG. 1 shows a scraper holder 1 in cross-section, which holds a scraper blade 2, which is to be turned against a roll or cylinder (eg drying cylinders of a paper machine) not shown, in order to remove its surface from contaminants and adhesions, such as Fiber remains from the paper web during their manufacture, to liberate.
  • a scraper holder 1 in cross-section, which holds a scraper blade 2, which is to be turned against a roll or cylinder (eg drying cylinders of a paper machine) not shown, in order to remove its surface from contaminants and adhesions, such as Fiber remains from the paper web during their manufacture, to liberate.
  • a roll or cylinder eg drying cylinders of a paper machine
  • the scraper holder 1 is supported on a support beam 3.
  • the scraper holder 1 and the scraper blade 2 are each adapted in their overall width BG substantially to the length of the rollers and cylinders to be shredded.
  • the scraper holder 1 according to the invention is formed from any number of produced 10 to 100 mm, preferably 25- 40mm wide modules or moldings 4, which can be lined up in a simple manner until the desired overall width BG is reached. No screwing is necessary for this. In addition, these individual moldings can stock well.
  • Each module or molded part 4 is made of plastic or a metal and can be produced as a whole, for example by injection molding or precision casting process.
  • the single molded part 4 has an elongated and slightly curved front wall 5, which ends in a tongue 6.
  • the molded part 4 has a front wall 5 formed on the support beam and fixed rear wall 7. Between the front wall 5 and rear wall 7 there is a narrow gap or gap 8, which ends at its transition point between the front and rear walls in a rounded groove or rounding A. Due to this configuration, the said point acts as an elastic joint, as will be described later.
  • the rear wall 7 has at its two end faces in each case a raised contact surface 9 and 10, which in the assembly of the scraper holder 2 (or the Stringing together of the individual moldings 4) abut one another, as in FIGS. 2 and 3 shown and also described later.
  • the molding 4 also has a branching off from the front wall 5 in the upper region T-like support member 11. That in the FIG. 1 and 4 Downwardly shown portion 11.1 of the "T" of the support member 11 forms on its front wall facing surface a support surface 12. Another support surface 13 forms a support surface 12 facing surface of the rear wall 7. Between the two support surfaces 12 and 13 is an inflatable pressure hose 14 clamped. The arrangement of the pressure hose 14 is made such that it is between the elastic joint. ie a pivot point D above the junction between the front and rear walls, and blade support points 15, 16 and 17 is located. It has been found that it is expedient to arrange the pressure hose 14 close to the blade support point 17 of the support part 11. This ensures that when shortening the scraper blade due to the wear of the blade tip 2c, the set scraper blade angle changes only slightly here.
  • the pressure hose 14 is otherwise adapted to the width BG of the scraper holder 1 and formed continuously. He is able, in the loaded state, ie when the pressure in the hose is increased (see dashed lines in the FIG. 4 ) Use the front wall 5 on the rigid rear wall 7 on the molded support member 11 and thus to press the doctor blade 2 against the roller 18. In this case deforms both the elastic joint in the area D (fulcrum), as well as a marked area F of the front wall.
  • the scraper blade 2 is supported with its front side 2a at the blade support point 15 and with its rear side 2b at the blade support point 16 and with its lower side 2d at the point 17.
  • the blade support point 15 is located next to the roller and is located at the free end of the front wall 5, which ends in the tongue 6.
  • the Klingenabstütztician 16 is, however, at the end of a portion 11.2 of the T-like shaped support member 11 at a distance from the point 15.
  • Der Blade support point 17 is located approximately in an imaginary extension line between the points 15 and 16 and represents a support for the doctor blade on a web 11.3 of the support member 11.
  • FIG. 3 a first and a second variant of the connection of the individual mold parts 4 are shown.
  • connecting elements 20 for example, elastomeric elements, such as rubber plates or plastic tongues each engaging in a recessed groove - and in the left half of an exemplary click system 21 is shown.
  • Both variants act according to the known tongue and groove principle and ensure a sealing function against entering liquid or dirt particles.
  • a selected number of individual moldings 4 is modularly joined to the scraper holder 1. This is done by stringing along an imaginary straight line (ie the tie rods 19) until the desired overall width BG of the scraper holder 1 is reached.
  • an imaginary straight line ie the tie rods 19
  • Each individual molding 4 has only a single width BE between 10 and 100 mm. In the example, about 30mm are chosen.
  • a distance a of about 0.01 mm whereby the entire scraper holder 1 is even more elastic and can be adjusted sensitively.
  • the lateral contact surfaces 9 and 10 of each individual molded part 4 are executed with 0.05 mm raised.
  • the tongue 6 and the support member 11 each at their Scraper blade 2 contacting points, namely at the Klingenabstütztechniken 15 and 16 and to be able to counteract wear of the corresponding components, each provided with a wear-resistant part 22 and 23.
  • a steel wire which is embedded or clipped into the tongue 6 and the support member 11 is suitable.

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  • Prostheses (AREA)

Abstract

The doctor holder (1) has a doctor blade (2) to clean a roll or cylinder (18) in a papermaking machine. The overall width of the holder and blade correspond to that of the roll or cylinder. This is achieved by making the holder of individual narrow molded parts (4) in a modular manner, arranging them to produce the required overall width.

Description

Die Erfindung betrifft einen Schaberhalter mit einer Schaberklinge zum Sauberhalten einer Walze und/oder eines Zylinders einer Herstellungsmaschine für eine Papier-, Karton- oder anderen Faserstoffbahn, wobei der Schaberhalter in seiner Gesamtbreite und auch die Schaberklinge im Wesentlichen an die Länge der Walze und/oder des Zylinders angepasst ist, gemäß dem Oberbegriff des vorliegenden Anspruchs 1.The invention relates to a scraper holder with a scraper blade for keeping clean a roller and / or a cylinder of a manufacturing machine for a paper, cardboard or other fibrous web, the scraper holder in its overall width and the doctor blade substantially to the length of the roller and / or is adapted to the cylinder, according to the preamble of the present claim 1.

Ein derartiger Schaberhalter ist aus der Praxis bereits bekannt, z.B. aus dem Dokument US 4 367 120 .Such a doctor holder is already known from practice, for example from the document US 4,367,120 ,

Er stützt sich in der Regel auf einem Tragkörper ab und nimmt über seine Gesamtbreite hinweg einen durchgehenden Druckschlauch auf. Im belasteten, d.h. aufgeblasenen Zustand, wird dadurch die Schaberklinge gegen die Walze und/oder den Zylinder angedrückt.It is usually supported on a support body and takes over its entire width away a continuous pressure hose. In loaded, i. inflated state, thereby the doctor blade is pressed against the roller and / or the cylinder.

Alle bekannten Schaberhalter bestehen aus einer Vielzahl an Bauelementen. Deren Herstellung ist sehr aufwändig. Für jede vorhandene Länge einer sauber zu haltenden oder zu reinigenden Walze und/oder Zylinders muss ein an deren bzw. dessen Länge angepasster Schaberhalter hergestellt werden, was uneffektiv ist.All known scraper holder consist of a variety of components. Their production is very complicated. For each existing length of a clean and to be cleaned roller and / or cylinder a matched to the length or scraper holder must be made, which is ineffective.

Aufgabe der vorliegenden Erfindung ist es, einen Schaberhalter anzugeben, der zum Einen einfacher herstellbar ist und zum Anderen leichter an die jeweilige Länge der zu reinigenden Umfangsfläche einer Walze und/oder eines Zylinders angepasst werden kann.The object of the present invention is to provide a scraper holder which on the one hand is easier to produce and on the other hand can be adapted more easily to the respective length of the peripheral surface of a roller and / or cylinder to be cleaned.

Erfindungsgemäß wird die Aufgabe der Erfindung durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.According to the invention the object of the invention is achieved by the features of the characterizing part of claim 1.

Es wird vorgeschlagen, dass jedes Formteil jeweils nur eine Breite zwischen 10 und 100 mm, vorzugsweise 25 bis 40mm aufweist. Derartige Teile lassen sich, wie gesagt, bedeutend einfacher herstellen und handhaben und lassen sich auch bestens bevorraten.It is proposed that each molding each only has a width between 10 and 100 mm, preferably 25 to 40mm. Such parts can, as I said, much easier to produce and handle and can also stockpile.

Dadurch die modulhafte Aneinanderreihung der Formteile lassen sich auf recht einfache Weise beliebige Baulängen an Schaberhaltern herstellen.As a result, the modular juxtaposition of the moldings can be produced in a fairly simple manner any lengths of scraper holders.

Das einzelne Formteil besteht aus einem einzigen Bauteil, welches eine leicht gekrümmte elastische Vorderwand, eine am unteren Ende der Vorderwand angeformte starre Rückwand und ein Abstützteil aufweist. Das Abstützteil befindet sich oberhalb der Rückwand und ist ebenfalls an die Vorderwand angeformt. Zwischen Vorder- und Rückwand besteht ein Zwischenraum, der an seinem unteren Teil, wo die angeformte Rückwand von der Vorderwand sozusagen um 180° nach oben abzweigt, mit einer Abrundung, d.h. einem Radius versehen ist und als elastisches Gelenk wirkt.The single molded part consists of a single component, which has a slightly curved elastic front wall, a molded on the lower end of the front wall rigid rear wall and a support member. The support member is located above the rear wall and is also formed on the front wall. Between the front and rear wall there is a gap which at its lower part, where the molded-on rear wall branches off from the front wall by 180 ° upwards so to speak, with a rounding, i. a radius is provided and acts as an elastic joint.

Der so geschaffene erfindungsgemäße Schaberhalter ist derart ausgebildet, dass er eine durchgehende breite Schaberklinge (die bei modernen Maschinen durchaus die 10m-Grenze überschreiten kann) wie eine Zange hält und deren Kräfte aufnehmen kann. Über die Elastizität und Verformung wird die Schaberklinge mit ihrer Klingenspitze gegen die betreffende Walze und /oder den betreffenden Zylinder angelegt, wodurch sich nur geringe Winkeländerungen bei Verschleiß der angelegten Schaberklinge ergeben.The scraper holder according to the invention thus created is designed such that it holds a continuous wide doctor blade (which can easily exceed the 10m limit in modern machines) like a pair of pliers and can absorb their forces. About the elasticity and deformation of the doctor blade is applied with its blade tip against the respective roller and / or the respective cylinder, resulting in only small changes in angle with wear of the applied doctor blade.

Da hierbei auch ein Drehpunkt vorhanden ist, der weit von der Klingenspitze entfernt liegt, ergeben sich nur geringe Winkeländerungen bei Verschleiß der Schaberklinge.Since this also a pivot point is present, which is far away from the blade tip, there are only small changes in angle with wear of the doctor blade.

Besonders vorteilhaft lassen sich solche Module bzw. Formteile aus Kunststoff im Spritzgussverfahren herstellen. Diese sind neben ihrer Korrosionsfestigkeit auch relativ preisgünstig. Eine Ausführung in Leichtmetall ist ebenso denkbar.Particularly advantageous such modules or molded plastic parts can be produced by injection molding. These are in addition to their corrosion resistance and relatively inexpensive. A version in light metal is also conceivable.

Wird an eine Herstellung aus metallischen Materialien gedacht, sind die Wandstärken zu ändern. Das Konstruktionsprinzip kann aber beibehalten werden.If you are thinking of making metallic materials, change the wall thicknesses. However, the design principle can be retained.

Das Formteil ist einstückig hergestellt.The molding is made in one piece.

Eine zweckmäßige Lösung besteht auch darin, dass die einzelnen Formteile jeweils einen Einsatz mit seitlich erhabenen Kontaktflächen aufweisen, über die die Formteile miteinander verbindbar sind. Vorzugsweise werden die direkten Kontaktflächen auf einen kleinen definierten Bereich begrenzt. Zwischen den einzelnen Kontaktflächen im zusammengefügten Zustand der Formteile ist ein Abstand von 0,01 bis 1 mm vorgesehen. Es wird ferner vorgeschlagen, die Kontaktflächen mit 0,005 bis 0,5 mm gegenüber den Seitenflächen der Formteile erhaben auszubilden.An expedient solution also consists in that the individual molded parts each have an insert with laterally raised contact surfaces, via which the molded parts can be connected to one another. Preferably, the direct contact surfaces are limited to a small defined area. Between the individual contact surfaces in the assembled state of the molded parts, a distance of 0.01 to 1 mm is provided. It is also proposed to form the contact surfaces with 0.005 to 0.5 mm with respect to the side surfaces of the moldings sublime.

Eine zweckmäßige Möglichkeit der Aufnahme der einzelnen Formteile und deren Verbindung über diese Kontaktflächen besteht darin, dass Zugstangen vorgesehen sind. Zugstangen sind an sich bekannt. Erfindungsgemäß sind sie in einer Länge gefertigt, die mindestens der zu schaffenden Gesamtbreite des Schaberhalters entspricht. Diese Zugstangen können aus einem Kohlefaserkunststoff (CFK) hergestellt sein.A convenient way of receiving the individual moldings and their connection via these contact surfaces is that tie rods are provided. Tie rods are known per se. According to the invention, they are manufactured in a length which corresponds at least to the total width of the scraper holder to be created. These tie rods can be made of a carbon fiber plastic (CFRP).

Eine Möglichkeit der Verbindung bzw. Aneinanderreihung der einzelnen Formteile kann über ein Klick-System gemäß dem an sich bekannten Nut-Feder-Prinzip erfolgen oder es sind dafür Verbindungselemente, beispielsweise elastomere Zungen, Blättchen oder Streifen (z.B. aus Kunststoff oder Gummi bestehend) vorgesehen. In allen Fällen ist aber eine Dichtfunktion nach außen hin, gegenüber Schmutzpartikeln und Feuchtigkeit zu gewährleisten.One way of connecting or juxtaposing the individual moldings can be done via a click system according to the known tongue and groove principle or there are connecting elements, such as elastomeric tongues, leaflets or strips (eg made of plastic or rubber) provided. In all cases, however, a sealing function towards the outside, opposite To ensure dirt particles and moisture.

Sehr vorteilhaft hinsichtlich Montage und Wartung ist, dass der erfindungsgemäße Schaberhalter über seine Gesamtbreite hinweg einen einzigen durchgehenden Druckschlauch aufnimmt, der im belasteten, d.h. wenn der Druck im Schlauch gesteigert wird, über ein angeformtes Abstützteil die Vorderwand an die starre Rückwand heranzieht und damit die Schaberklinge gegen die betreffende zu beschabernde Walze oder den betreffenden Zylinder drückt. Dabei wird ein Teil der Vorderwand deformiert.Very advantageous in terms of installation and maintenance is that the scraper holder according to the invention over its entire width away receives a single continuous pressure hose, the loaded in the, i. when the pressure in the hose is increased, via a molded support member, the front wall on the rigid rear wall pulls up and thus presses the doctor blade against the relevant beschabernde roller or cylinder in question. In this case, a part of the front wall is deformed.

Im unbelasteten, bzw. bei sinkendem Innendruck oder Druck Null im Druckschlauch wird die Freigabe der eingeschobenen Schaberklinge möglich, zumindest aber ein Abstand der Klingenspitze zur Walze bzw. zum Zylinder erreicht.In the unloaded, or with decreasing internal pressure or zero pressure in the pressure hose, the release of the inserted doctor blade is possible, but at least achieved a distance of the blade tip to the roller or to the cylinder.

Der Vorteil der Erfindung ist, dass der zwischen den Abstützflächen der Rückwand und des T-artig geformten Abstützteiles positionierte handelsübliche Druckschlauch nur den freien Federweg überwinden und die nötige Kraft für die Klingenbelastung erzeugen muss.The advantage of the invention is that the commercial pressure hose positioned between the support surfaces of the rear wall and the T-shaped support member only has to overcome the free spring travel and generate the necessary force for the blade load.

Der Druckschlauch ist innerhalb der Formteile so angeordnet, dass er relativ nahe an der Schaberklingenspitze sitzt. Dadurch kann er ohne große Hebelübersetzung wirken. Genauer gesagt, sollte der Druckschlauch zwischen einem Drehpunkt und Klingenabstützpunkten liegen. Dabei sollte er näher an einem Klingenabstützpunkt als am Drehpunkt bzw. dem besagten elastisch wirkendem Gelenkpunkt des Schaberhalters liegen.The pressure hose is disposed within the mold parts so that it sits relatively close to the doctor blade tip. As a result, he can act without much leverage. More specifically, the pressure hose should be between a fulcrum and blade support points. He should be closer to a Klingenabstützpunkt than at the fulcrum or the said elastically acting hinge point of the scraper holder.

Um beim Einschieben der Schaberklinge in den fertig zusammengefügten Schaberhalter den Verschleiß derjenigen Flächen, die die Schaberklinge kontaktieren, auf ein Mindestmaß reduzieren zu können, ist es sehr sinnvoll, wenn die Kontaktstellen (d.h. Klingenabstützpunkte) mit einem verschleißhemmenden Material versehen sind. Dafür eignen sich eingelassene oder eingeklipste Stahldrähte. Außerdem lässt sich die Schaberklinge so ohne Überfahrung von Stoßstellen einschieben.To be able to reduce the wear of those surfaces that contact the doctor blade to a minimum when inserting the doctor blade into the assembled scraper holder, it is very useful if the contact points (ie blade support points) are provided with a wear-resistant material. For this purpose, embedded or clipped steel wires are suitable. In addition, the doctor blade can be so without overstressing joints Push.

Sehr vorteilhaft ist, dass die einzelnen modulartig zusammengefügten Formteile auf einem am Tragkörper angebrachten und in die Rückwand eingelassenen, durchgängigen T-Stück sitzen. Es ist deshalb kein Festschrauben des Schaberhalters notwendig.It is very advantageous that the individual modularly assembled moldings are mounted on a continuous T-piece attached to the support body and let into the rear wall. It is therefore not necessary to screw the scraper holder.

Wird ein solches T-Stück an vorhandene Tragbalken angebracht, so können bestehende Vorrichtungen auf diese einfache Weise nachgerüstet werden.If such a tee attached to existing support beams, existing devices can be retrofitted in this simple way.

Es ergeben sich keinerlei Deformationsprobleme durch thermische Beanspruchung, weil sich der erfindungsgemäße Schaberhalter am T-Stück ausrichtet.There are no deformation problems due to thermal stress, because the scraper holder according to the invention aligns with the T-piece.

Es soll nicht unerwähnt bleiben, dass eine Hubbegrenzung in das Schaberhalterprofil bzw. die einzelnen Formteile integriert werden kann.It should not go unmentioned that a stroke limitation can be integrated into the scraper holder profile or the individual moldings.

Nachfolgend soll die Erfindung anhand eines Ausführungsbeispieles näher erläutert werden.The invention will be explained in more detail with reference to an embodiment.

Es zeigen:

Figur 1 und 4:
einen Querschnitt durch einen gegen eine Walze oder Zylinder angestellten Schaberhalter mit eingeschobener Schaberklinge
Figur 2:
eine Ansicht A auf eine ersten Variante der Verbindung von einzelnen Formteile bzw. Module miteinander
Figur 3:
eine Ansicht A auf eine zweite Variante zu Figur 2
Figur 5:
in perspektivischer Darstellung ein aus einer beliebigen Anzahl an Formteilen bzw. Modulen zusammengefügter, erfindungsgemäßer Schaberhalter
Show it:
FIGS. 1 and 4:
a cross section through an employed against a roller or cylinder scraper holder with inserted scraper blade
FIG. 2:
a view A to a first variant of the connection of individual moldings or modules together
FIG. 3:
a view A to a second variant FIG. 2
FIG. 5:
in a perspective view of an assembled from any number of moldings or modules, inventive scraper holder

In den einzelnen Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the individual figures, the same components are provided with the same reference numerals.

Figur 1 zeigt einen Schaberhalter 1 im Querschnitt, der eine Schaberklinge 2 hält, die gegen eine nicht mit dargestellte zu beschabernde Walze oder einen Zylinder (z. B. Trockenzylindern einer Papiermaschine) angestellt werden soll, um deren bzw. dessen Oberfläche von Verunreinigungen und Anhaftungen, wie Faserreste aus der Papierbahn während ihrer Herstellung, zu befreien. FIG. 1 shows a scraper holder 1 in cross-section, which holds a scraper blade 2, which is to be turned against a roll or cylinder (eg drying cylinders of a paper machine) not shown, in order to remove its surface from contaminants and adhesions, such as Fiber remains from the paper web during their manufacture, to liberate.

Der Schaberhalter 1 stützt sich auf einem Tragbalken 3 ab. Der Schaberhalter 1 und die Schaberklinge 2 sind jeweils in Ihrer Gesamtbreite BG im Wesentlichen an die Länge der zu beschabernden Walzen und Zylinder angepasst.The scraper holder 1 is supported on a support beam 3. The scraper holder 1 and the scraper blade 2 are each adapted in their overall width BG substantially to the length of the rollers and cylinders to be shredded.

Der Schaberhalter 1 gemäß der Erfindung wird gebildet aus einer beliebigen Anzahl an hergestellten 10 bis 100 mm, vorzugsweise 25- 40mm breiten Modulen bzw. Formteilen 4, die sich auf einfache Weise aneinander reihen lassen, bis die gewünschte Gesamtbreite BG erreicht ist. Dazu sind keinerlei Verschraubungen notwendig.
Außerdem lassen sich diese einzelnen Formteile gut bevorraten.The scraper holder 1 according to the invention is formed from any number of produced 10 to 100 mm, preferably 25- 40mm wide modules or moldings 4, which can be lined up in a simple manner until the desired overall width BG is reached. No screwing is necessary for this.
In addition, these individual moldings can stock well.

Jedes Modul bzw. Formteil 4 besteht aus Kunststoff bzw. auch einem Metall und lässt sich als Ganzes beispielsweise im Spritzguss- oder Feinguss- Verfahren herstellen.Each module or molded part 4 is made of plastic or a metal and can be produced as a whole, for example by injection molding or precision casting process.

Das einzelne Formteil 4 weist eine lang gestreckte und leicht gekrümmte Vorderwand 5 auf, das in einer Zunge 6 endet. Zum Tragkörper 2 hin weist das Formteil 4 eine an die Vorderwand 5 angeformte und am Tragbalken fixierte Rückwand 7 auf. Zwischen Vorderwand 5 und Rückwand 7 besteht ein schmaler Zwischenraum bzw. Spalt 8, der an seiner Übergangsstelle zwischen Vorder- und Rückwand in einer abgerundeten Nut bzw. Abrundung A endet. Aufgrund dieser Gestaltung wirkt die besagte Stelle als elastisches Gelenk, wie später noch beschrieben wird.
Die Rückwand 7 weist an ihren beiden Stirnseiten jeweils eine erhabene Kontaktfläche 9 und 10 auf, die beim Zusammenbau des Schaberhalters 2 (bzw. der Aneinanderreihung der einzelnen Formteile 4) aneinander stoßen, wie in Figur 2 und 3 dargestellt und ebenfalls später noch beschrieben wird.The single molded part 4 has an elongated and slightly curved front wall 5, which ends in a tongue 6. Toward the supporting body 2, the molded part 4 has a front wall 5 formed on the support beam and fixed rear wall 7. Between the front wall 5 and rear wall 7 there is a narrow gap or gap 8, which ends at its transition point between the front and rear walls in a rounded groove or rounding A. Due to this configuration, the said point acts as an elastic joint, as will be described later.
The rear wall 7 has at its two end faces in each case a raised contact surface 9 and 10, which in the assembly of the scraper holder 2 (or the Stringing together of the individual moldings 4) abut one another, as in FIGS. 2 and 3 shown and also described later.

Wie aus Figur 4 hervorgeht, weist das Formteil 4 außerdem noch ein von der Vorderwand 5 in deren oberen Bereich abzweigendes T- artiges Abstützteil 11 auf. Das in der Figur 1 und 4 nach unten zeigend dargestellte Teilstück 11.1 des "T" des Abstützteiles 11 bildet an ihrer zur Vorderwand zeigenden Fläche eine Abstützfläche 12. Eine weitere Abstützfläche 13 bildet eine zur Abstützfläche 12 zeigende Fläche der Rückwand 7. Zwischen den beiden Abstützflächen 12 und 13 ist ein aufblasbarer Druckschlauch 14 geklemmt. Die Anordnung des Druckschlauches 14 ist dabei so getroffen, dass er zwischen dem elastischen Gelenk. d.h. einem Drehpunkt D oberhalb der Verbindungsstelle zwischen Vorder- und Rückwand, und Klingenabstützpunkten 15, 16 und 17 liegt. Man hat herausgefunden, dass es zweckmäßig ist, den Druckschlauch 14 nahe an den Klingenabstützpunkt 17 des Abstützteiles 11 heran anzuordnen. Damit wird erreicht, dass bei Kürzerwerden der Schaberklinge infolge des Verschleißes der Klingenspitze 2c sich der eingestellte Schaberklingenwinkel hier nur geringfügig ändert.How out FIG. 4 shows, the molding 4 also has a branching off from the front wall 5 in the upper region T-like support member 11. That in the FIG. 1 and 4 Downwardly shown portion 11.1 of the "T" of the support member 11 forms on its front wall facing surface a support surface 12. Another support surface 13 forms a support surface 12 facing surface of the rear wall 7. Between the two support surfaces 12 and 13 is an inflatable pressure hose 14 clamped. The arrangement of the pressure hose 14 is made such that it is between the elastic joint. ie a pivot point D above the junction between the front and rear walls, and blade support points 15, 16 and 17 is located. It has been found that it is expedient to arrange the pressure hose 14 close to the blade support point 17 of the support part 11. This ensures that when shortening the scraper blade due to the wear of the blade tip 2c, the set scraper blade angle changes only slightly here.

Der Druckschlauch 14 ist im Übrigen an die Breite BG des Schaberhalters 1 angepasst und durchgehend ausgebildet. Er ist in der Lage, im belasteten Zustand, d.h. wenn der Druck im Schlauch gesteigert wird, (siehe gestrichelte Linienführung in der Figur 4) über das angeformte Abstützteil 11 die Vorderwand 5 an die starre Rückwand 7 heranzuziehen und damit die Schaberklinge 2 gegen die Walze 18 zu drücken. Dabei deformiert sowohl das elastische Gelenk im Bereich D (Drehpunkt), als auch ein eingezeichneter Bereich F der Vorderwand.The pressure hose 14 is otherwise adapted to the width BG of the scraper holder 1 and formed continuously. He is able, in the loaded state, ie when the pressure in the hose is increased (see dashed lines in the FIG. 4 ) Use the front wall 5 on the rigid rear wall 7 on the molded support member 11 and thus to press the doctor blade 2 against the roller 18. In this case deforms both the elastic joint in the area D (fulcrum), as well as a marked area F of the front wall.

Die Schaberklinge 2 stützt sich mit ihrer Vorderseite 2a am Klingenstützpunkt 15 und mit ihrer Rückseite 2b am Klingenabstützpunkt 16 sowie mit ihrer Unterseite 2d am Punkt 17 ab. Der Klingenabstützpunkt 15 ist dabei am nächsten zur Walze gelegen und befindet sich am freien Ende der Vorderwand 5, welche in der Zunge 6 endet. Der Klingenabstützpunkt 16 befindet sich dagegen am Ende eines Teilstückes 11.2 des T-artig geformten Abstützteiles 11 auf Abstand zum Punkt 15. Der Klingenabstützpunkt 17 liegt ungefähr in einer gedachten Verlängerungslinie zwischen den Punkten 15 und 16 und stellt eine Auflage für die Schaberklinge auf einem Steg 11.3 des Abstützteiles 11 dar.The scraper blade 2 is supported with its front side 2a at the blade support point 15 and with its rear side 2b at the blade support point 16 and with its lower side 2d at the point 17. The blade support point 15 is located next to the roller and is located at the free end of the front wall 5, which ends in the tongue 6. The Klingenabstützpunkt 16 is, however, at the end of a portion 11.2 of the T-like shaped support member 11 at a distance from the point 15. Der Blade support point 17 is located approximately in an imaginary extension line between the points 15 and 16 and represents a support for the doctor blade on a web 11.3 of the support member 11.

Im unbelasteten Zustand (siehe die durchgehend gezeichneten Linien der Figur 4) wird die Vorderwand 5 von der Rückwand 7 abgehoben, d.h. der Zwischenraum bzw. der oben offene Spalt 8 vergrößert sich und die Spitze 2c der Schaberklinge 2 bildet nun einen Abstand x zur Walze 18 bzw. dem Zylinder, wo die Klinge nicht mehr wirkt bzw. in den Schaberhalter 1 eingeschoben oder herausgezogen werden kann.In the unloaded condition (see the continuous lines of the FIG. 4 ), the front wall 5 is lifted off the rear wall 7, ie the space or the gap 8 open at the top increases and the tip 2c of the doctor blade 2 now forms a distance x from the roller 18 or the cylinder where the blade no longer acts or . Can be inserted or pulled out in the scraper holder 1.

In der Figur 3 sind eine erste und eine zweite Variante der Verbindung der einzelnen Formteile 4 dargestellt. In der rechten Bildhälfte sind Verbindungselemente 20 - beispielsweise elastomere Elemente, wie Gummiplättchen oder Kunststoffzungen die jeweils in eine eingelassene Nut eingreifen - und in der linken Bildhälfte ist beispielhaft ein Klick-System 21 dargestellt. Beide Varianten wirken gemäß dem an sich bekannten Nut-Feder- Prinzip und gewährleisten eine Dichtfunktion gegenüber eintretender Flüssigkeit oder Schmutzpartikeln.In the FIG. 3 a first and a second variant of the connection of the individual mold parts 4 are shown. In the right half of the drawing are connecting elements 20 - for example, elastomeric elements, such as rubber plates or plastic tongues each engaging in a recessed groove - and in the left half of an exemplary click system 21 is shown. Both variants act according to the known tongue and groove principle and ensure a sealing function against entering liquid or dirt particles.

Wie aus Figur 5 erkennbar, ist eine gewählte Anzahl an einzelnen Formteilen 4 modulartig zum Schaberhalter 1 zusammengefügt. Das erfolgt durch Aneinanderreihung entlang einer gedachten Geraden (d.h. den Zugstangen19) bis die gewünschte Gesamtbreite BG des Schaberhalters 1 erreicht ist. Im Beispiel der Figur 5 bilden fünf einzelne Formteile 4 den Gesamt- Schaberhalter 1. Jedes einzelne Formteil 4 hat jeweils nur eine Einzelbreite BE zwischen 10 und 100 mm. Im Beispiel sind ca. 30mm gewählt.How out FIG. 5 recognizable, a selected number of individual moldings 4 is modularly joined to the scraper holder 1. This is done by stringing along an imaginary straight line (ie the tie rods 19) until the desired overall width BG of the scraper holder 1 is reached. In the example of FIG. 5 form five individual moldings 4 the total scraper holder 1. Each individual molding 4 has only a single width BE between 10 and 100 mm. In the example, about 30mm are chosen.

Zwischen den einzelnen Formteilen 4 verbleibt im zusammengefügten Zustand ein Abstand a von ca. 0,01 mm, wodurch der gesamte Schaberhalter 1 noch elastischer wird und sich feinfühliger einstellen lässt. Dazu sind die seitlichen Kontaktflächen 9 und 10 jedes einzelnen Formteiles 4 mit 0,05 mm erhaben ausgeführt.Between the individual mold parts 4 remains in the assembled state, a distance a of about 0.01 mm, whereby the entire scraper holder 1 is even more elastic and can be adjusted sensitively. For this purpose, the lateral contact surfaces 9 and 10 of each individual molded part 4 are executed with 0.05 mm raised.

Nachzutragen ist, dass die Zunge 6 und das Abstützteil 11 jeweils an ihren die Schaberklinge 2 kontaktierenden Punkten, nämlich an den Klingenabstützpunkten 15 und 16 und um einen Verschleiß der entsprechenden Bauteile entgegen wirken zu können, mit jeweils einem verschleißhemmenden Teil 22 und 23 versehen. Dafür eignet sich vorzugsweise ein Stahldraht, der in die Zunge 6 und das Abstützteil 11 eingelassen bzw. eingeklipst ist.It should be added that the tongue 6 and the support member 11 each at their Scraper blade 2 contacting points, namely at the Klingenabstützpunkten 15 and 16 and to be able to counteract wear of the corresponding components, each provided with a wear-resistant part 22 and 23. For this purpose, preferably a steel wire, which is embedded or clipped into the tongue 6 and the support member 11 is suitable.

Im Übrigen sitzen alle verwendeten modulartig zusammengefügten Formteile 4, wie auch in Figur 1 zu sehen ist, auf einem am Tragbalken 3 angebrachten durchgängigen T-Stück 24. Diese Konstruktion bietet den Vorteil, dass Deformationsprobleme wegen thermischer Beanspruchung sich nicht einstellen können, weil sich der gesamte Schaberhalter 1 am T- Stück 24 ausrichtet.Incidentally, sit all used modularly assembled moldings 4, as well as in FIG. 1 It can be seen on a continuous T-piece 24 attached to the supporting beam 3. This design offers the advantage that deformation problems due to thermal stress can not be established because the entire scraper holder 1 aligns with the T-piece 24.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Schaberhalterdoctor holder
22
Schaberklingescraper blade
2a2a
Vorderseitefront
2b2 B
Rückseiteback
2c2c
Klingenspitzeblade tip
2d2d
Unterseitebottom
33
Tragebalkensupport beams
44
Formteilmolding
55
Vorderwandfront wall
66
Zungetongue
77
Rückwandrear wall
88th
Zwischenraumgap
99
Kontaktflächecontact area
1010
Kontaktflächecontact area
1111
Abstützteilsupporting part
11.111.1
Teilstücksection
11.211.2
Teilstücksection
11.311.3
Stegweb
1212
Abstützflächesupporting
1313
Abstützflächesupporting
1414
Druckschlauchpressure hose
1515
KlingenabstützpunktKlingenabstützpunkt
1616
KlingenabstützpunktKlingenabstützpunkt
1717
KlingenabstützpunktKlingenabstützpunkt
1818
Walzeroller
1919
Zugstangepull bar
2020
Verbindungselementconnecting element
2121
Klick-SystemClick system
2222
Verschleißhemmendes TeilWear-resistant part
2323
Verschleißhemmendes TeilWear-resistant part
2424
T-StückTee
AA
Abrundungrounding off
BEBE
EinzelbreiteSingle width
BGBG
Gesamtbreiteoverall width
DD
Drehpunktpivot point
FF
Bereich der VerformungRange of deformation
xx
Abstanddistance

Claims (15)

  1. Doctor holder (1) for a doctor blade (2) for keeping clean a roll and/or a cylinder (18) of a production machine for a paper, board or other fibrous web, the overall width (BG) of the doctor holder (1) and also the doctor blade (2) being substantially matched to the length of the roll and/or of the cylinder (18), it being possible for the doctor holder (1) to be built up from individual narrow moulded parts (4) in a modular manner by lining up the individual moulded parts (4) in a row to the desired overall width (BG), and it being possible for the doctor blade to be inserted in such a way that it makes contact with a blade supporting point (15, 16, 17) in each case with its underside (2d), with the front side (2a) and the rear side (2b),
    characterized in that
    the moulded parts in each case comprise a single component, which comprises a front wall (5) that can be deformed elastically in a region (F), a rigid rear wall (7) originating from the lower part of the front wall, and a supporting part (11) formed in the manner of a T and integrally moulded on in the upper part of the front wall (5), an interspace or gap (8) that is open at the top and originates from a rounded portion (A) having a pivot (D) being formed between front wall (5) and rear wall (7).
  2. Doctor holder (1) according to Claim 1,
    characterized in that
    the individual moulded parts (4) are produced from plastic or metal.
  3. Doctor holder (1) according to Claim 1 or 2,
    characterized in that
    the individual moulded parts (4) are produced in an injection-moulding or precision-moulding process that is known per se.
  4. Doctor holder (1) according to Claims 1 to 3,
    characterized in that
    the individual moulded parts (4) have laterally elevated contact surfaces (9, 10), over which the moulded parts (4) can be lined up with one another along an imaginary straight line.
  5. Doctor holder (1) according to Claims 1 to 4,
    characterized in that
    the individual moulded parts (4) can be connected to one another via tie rods (19).
  6. Doctor holder (1) according to Claims 1 to 5,
    characterized in that
    the individual moulded parts (4) can be connected to one another in a sealing manner by connecting elements (20), for example elastomer elements.
  7. Doctor holder (1) according to Claims 1 to 5,
    characterized in that
    the individual moulded parts (4) can be connected to one another in a sealing manner via a click system (21).
  8. Doctor holder (1) according to Claim 5,
    characterized in that
    the tie rods (19) consist of a carbon-fibre reinforced plastic (CFP).
  9. Doctor holder (1) according to Claim 1,
    characterized in that
    the rear wall (7) and the supporting part (11) in each case have a supporting surface (12, 13).
  10. Doctor holder (1) according to Claim 1,
    characterized in that
    over its overall width (BG), along the supporting surfaces (12, 13), it accommodates a pressure hose (14) which, in the loaded state, i.e. with increasing internal pressure, is capable of forcing the front wall (5) in the direction of the rigid rear wall and of placing the doctor blade (2) against the roll or cylinder (18) to be doctored and, in the unloaded state or with decreasing internal pressure, of achieving an opposite movement, which means lifting the doctor blade (2) off the roll or cylinder (18) to be doctored.
  11. Doctor holder (1) according to Claim 1,

    characterized in that
    the pressure hose (14) is preferably arranged between the pivot (D) and a blade supporting point (17) of the assembled doctor holder (1), the pressure hose (14) being located as close as possible to the blade supporting point (17).
  12. Doctor holder (1) according to Claim 1,
    characterized in that
    the blade supporting points (15, 16, 17) in each case have a wear-inhibiting part (22, 23).
  13. Doctor holder (1) according to one or more of the preceding claims,
    characterized in that
    the individual moulded parts (4) joined together in a modular manner are fitted to a supporting element (3) and are seated in a continuous T-piece (24) let into the rear wall (7).
  14. Doctor holder (1) according to one or more of the preceding claims,
    characterized in that
    when the individual moulded parts (4) are joined together there remains a distance between them of 0.01 to 1 mm and, for this purpose, the contact surfaces (9, 10) are formed so as to be elevated by 0.005 to 0.5 mm with respect to the remaining area of the side surfaces of the moulded parts (4).
  15. Doctor holder (1) according to one or more of the preceding claims,
    characterized in that
    each moulded part (4) in each case only has a width (BE) of between 10 and 100, preferably 25 to 40 mm.
EP07112909A 2006-07-24 2007-07-23 Doctor blade support Not-in-force EP1882776B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006034654A DE102006034654A1 (en) 2006-07-24 2006-07-24 doctor holder

Publications (2)

Publication Number Publication Date
EP1882776A1 EP1882776A1 (en) 2008-01-30
EP1882776B1 true EP1882776B1 (en) 2011-04-13

Family

ID=38483141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07112909A Not-in-force EP1882776B1 (en) 2006-07-24 2007-07-23 Doctor blade support

Country Status (3)

Country Link
EP (1) EP1882776B1 (en)
AT (1) ATE505587T1 (en)
DE (2) DE102006034654A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008041824A1 (en) 2008-09-05 2010-03-11 Voith Patent Gmbh Device for scraping surface of roller or cylinder of e.g. paper production or finishing machine, has blade supported in blade holder and extending transverse to surface, where blade exhibits curvature about axis parallel to axis of roller

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122767A (en) * 1962-07-23 1964-03-03 Bird Machine Co Sectional doctor blade holder
GB1198162A (en) * 1968-02-01 1970-07-08 Vickerys Ltd Improvements in Doctors for Paper-Making and like Machines
US3559229A (en) * 1968-12-19 1971-02-02 Allis Chalmers Mfg Co Doctor assembly
GB1309804A (en) * 1970-06-06 1973-03-14 Winterburn Ltd Joseph Roll doctor apparatus
US4367120A (en) * 1980-03-13 1983-01-04 Vickerys Limited Doctor blade mounting assembly

Also Published As

Publication number Publication date
DE102006034654A1 (en) 2008-01-31
EP1882776A1 (en) 2008-01-30
ATE505587T1 (en) 2011-04-15
DE502007006917D1 (en) 2011-05-26

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