EP1746206A1 - Appareil de raclage - Google Patents

Appareil de raclage Download PDF

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Publication number
EP1746206A1
EP1746206A1 EP06115872A EP06115872A EP1746206A1 EP 1746206 A1 EP1746206 A1 EP 1746206A1 EP 06115872 A EP06115872 A EP 06115872A EP 06115872 A EP06115872 A EP 06115872A EP 1746206 A1 EP1746206 A1 EP 1746206A1
Authority
EP
European Patent Office
Prior art keywords
holder
bearing
scraper device
machine direction
pressing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06115872A
Other languages
German (de)
English (en)
Inventor
Ansgar Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1746206A1 publication Critical patent/EP1746206A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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 doctoring device for beschaberung a roller in a paper, board or Tissuemaschine with a holder, with a doctor blade and at least one pressing element, the doctor blade is mounted on the holder movable transversely to the machine direction and by means of the support member mounted on the holder against the roller to be doctored can be pressed.
  • Scraper devices usually have a scraper bar attached to the machine frame, to which a scraper holder is fastened, which in turn holds a scraper blade which can be pressed against a roller to be doctored.
  • a scraper device which is mounted on a support frame or scraper bar and is pivotable relative to a roll with respect to its angle of attack.
  • the scraper device along with the scraper bar, oscillates transversely to the machine direction.
  • this object is achieved in a scraper device of the type mentioned above in that the holder has two holder elements which are movable relative to each other transversely to the machine direction, wherein the doctor blade is mounted on one of the two holder elements together with this movable transversely to the machine direction and wherein the at least one pressing element is fastened to one of the two holder elements in such a way that, as the doctor blade moves transversely to the machine direction, the other of the two holder elements moves transversely to the machine direction relative to the at least one pressing element.
  • both the mass oscillating transversely to the machine direction and the mass to be pressed against the roller to be doctored are reduced substantially to the doctor blade and the holder element connected thereto and resonating with it.
  • the invention thus makes it possible to oscillate the doctor blade with the aid of bearings, such as slide bearings, which are installed directly in a press-on holder become.
  • the doctor blade and the at least one pressing element are attached to the same of the two holder elements., I. when moving transversely to the machine direction, the holder element with the scraper blade attached thereto and the pressing element attached thereto move together relative to the other holder element.
  • the scraper blade and the at least one pressing element are attached to different of the two holder elements.
  • the one holder element moves together with the scraper blade attached thereto relative to the other of the holder elements with the pressing member attached thereto.
  • the relative movement of the two holder elements supports the at least one pressing element against the holder element movable relative to it.
  • various bearings are possible by means of which a relative movement between the two holder elements can be realized transversely to the machine direction.
  • the two holder elements are movable relative to each other by a sliding bearing or a roller or ball bearings or a fluid bearing, in particular air or water bearings, or a magnetic bearing transversely to the machine direction.
  • a sliding bearing or a roller or ball bearings or a fluid bearing in particular air or water bearings, or a magnetic bearing transversely to the machine direction.
  • the sliding bearing a lubrication, for example. by means of a fluid such as water.
  • a fluid lubrication has the further advantage that at the same time a cleaning of the storage is achieved.
  • the slide bearing comprises at least one bearing rod attached to one of the two holder elements and extending transversely to the machine direction and at least one bearing block attached to the other of the two holder elements, wherein the bearing rod on the bearing block relative to this transversely to the machine direction is movably mounted.
  • Such a configuration can be carried out particularly cost-effective and maintenance-free.
  • the sliding bearing at least in sections comprises a sliding bearing material.
  • the plain bearing material can be formed, for example, by a steel-bronze combination. Furthermore, it is possible that the bearing block and / or the bearing rod are formed either completely or only in the contact region of the sliding bearing material. Specifically, this means that, for example, the bearing block is formed either completely or in the contact area with the bearing rod made of bronze, wherein the bearing rod is formed either completely or in the area of contact with the bearing block made of steel.
  • Such plain bearing materials usually have coefficients of friction of 0.3 or less, preferably in the range of 0.05 to 0.2.
  • materials and sliding plastics such as PTFE may be considered.
  • the holder element which can be moved together with the doctor blade comprises a cover plate which is fixedly connected to the bearing rod and that the other of the two holder elements comprises the bearing block.
  • the contact pressure element is firmly connected to the base plate, then this forms a sliding bearing with the side of the cover plate facing the contact pressure element. On the other hand, if the contact pressure element is firmly connected to the cover plate, then this forms a sliding bearing with the side of the base plate facing the contact pressure element.
  • the pressing element comprises in the contact area, i. in the region in which the sliding bearing is formed, a material portion which is made of a different material compared to the rest of the pressing element.
  • the side of the base plate or the cover plate facing the contact pressure element in the contact region may comprise, at least in sections, a material section which is made of a different material than the rest of the base plate or cover plate.
  • This material is in particular a plain bearing material which, for example, has a coefficient of friction of 0.3 or less, in particular in the range of 0.05 to 0.2 and, for example, plain bearing plastic.
  • the plain bearing material can be connected in particular by gluing, inserting, clamping, screwing or vulcanizing with the example formed as a contact pressure hose pressing element.
  • a specific embodiment of the invention provides that the holder element movable relative to the doctor blade transversely to the machine direction comprises a base plate, wherein the base plate and the cover plate are tiltable relative to each other about a rotational axis extending transversely to the machine direction under the action of the at least one pressing element.
  • the axis of rotation about which the doctor blade for pressing a beschabrernden roller is movable and the axis along which the relative movement between the base plate and the cover plate with doctor blade takes place whereby the construction is particularly simple and thus cost-effective to implement.
  • the cover plate and / or the base plate may comprise a fiber composite material, such as fiber reinforced plastic. But it is also conceivable that the cover and / or base plate comprises a metallic material.
  • the cover and / or base plate may in this case be formed, for example, as a bar extruded profile or pultrusion profile.
  • the at least one pressing element can be realized.
  • the at least one pressing element comprises a pressure hose which can be inflated by means of a fluid and / or an elastic, in particular resilient element.
  • the pressure hose preferably comprises an elastomer or a fabric.
  • the resilient element is preferably a steel spring or a rubber.
  • the doctor blade In order to bring about a movement of the doctor blade to the beschabernden roll back and forth from this, it makes sense if at least two pressing elements are provided, which are arranged in the machine direction on both sides of the axis of rotation. As a result, a movement of the scraper blade to the roller and away from the roller is achieved by opposing driving of the two pressing elements. If, for example, the two pressing elements are designed as pressure hoses, then the reciprocating motion of the doctor blade relative to the roller can be achieved by filling the pressure hoses in opposite directions with air.
  • a specific embodiment of the invention provides that the at least two pressing elements are pressure hoses. But it is also possible that one of the at least two pressing elements is a pressure hose and the other of the two pressing elements an elastic, in particular elastic element such as, for example, a spring.
  • the axis of rotation preferably extends along the bearing rod rotatably mounted in the bearing block.
  • the advantages of the invention are that the scraper bearings fall away on both sides of the machine, resulting in a cost savings. Due to the simplification of the oscillation system, no additional costs are incurred by the invention in the design of the doctor blade press system. Compared with known scraper arrangements, the scraper bar can be stiffer, which increases the vibration stability. In some places, even a non-supported scraper bar can be dispensed with. It achieves a very compact construction, which can also be robust. The wear in the plain bearings is negligible given a suitable choice of material because of the small contact load, at best, contamination can cause significant wear.
  • FIG. 1 shows a scraper device 1 with a holder 3 fastened to a scraper bar 2 for holding a scraper blade 18.
  • the holder 3 has a first holder element 4 and a second holder element 5.
  • the first holder element 4 comprises a cover plate 6 at the end of which the scraper blade 18, which is shown only in sections, is fastened in a recess 17.
  • first holder element 4 is a transversely to the Machine running direction extending bearing rod 7 and a screw 8, through which the cover plate 6 is fixedly connected to the bearing rod 7.
  • the second holder element 5 is fastened to the scraper bar 2 and comprises a base plate 9 to which at least one bearing block 10 is fastened.
  • the bearing rod 7 is mounted displaceably transversely to the machine direction to form a sliding bearing.
  • the plain bearing here comprises at least in sections a plain bearing material 19, such as, for example, a plain bearing plastic such as PTFE.
  • bearing blocks can be provided, which can be arranged lying transversely to the machine direction one behind the other.
  • the bearing blocks then preferably have a length between 20 mm and 50 mm, but they can also be longer or have the length of the bearing rod 7. Up to ten bearing blocks 10 per meter length of the bearing rod 7 are conceivable.
  • the at least one bearing block 10 and the bearing rod 7 fix a rotational axis 11 extending transversely to the machine direction about which the cover plate 6 can be tilted relative to the base plate 9.
  • the axis of rotation 11 coincides with the bearing rod 7.
  • the illustrated embodiment realizes according to the invention that the holder 3 has two holder elements 4, 5 which are movable relative to one another transversely to the machine direction, wherein the doctor blade 18 on one of the two holder elements, here the cover plate 6 of the first holder element 4, together with the latter being movably mounted transversely to the machine direction, and wherein the at least one pressing element 12, 13 is fastened to one of the two holder elements, here on the base plate 9 of the second holder element 5, such that, when the scraper blade 18 moves transversely to the machine direction another of the two holder elements, namely the first holder element 4 with the cover plate 6, relative to the at least one pressing element 12, 13 moves transversely to the machine direction.
  • the base plate 6 and the cover plate 9 By opposing filling and venting of the two pressing elements 12, 13 causes the base plate 6 and the cover plate 9 is tilted relative to each other about the axis of rotation 11 extending transversely to the machine direction, whereby the scraper blade 18 is pressed against a roller to beschabernde or Pressing force of the doctor blade 18 is taken back to the roller again.
  • at least one of the two pressing elements 12, 13 is supported against the movable relative to this cover plate 6 to form a plain bearing (dashed lines).
  • the contact pressure elements 12, 13 in the contact region each comprise a sliding bearing material 15, 16 of, for example, PTFE.
  • FIG. 2 shows a further embodiment of a scraper device 20 according to the invention. For the sake of clarity, only the differences from the scraper device 1 of FIG. 1 are to be discussed. Same objects are provided with the same reference numerals.
  • the scraper device 20 of Figure 2 differs by that of Figure 1 essentially in that instead of the axis of rotation 11 on both sides arrangement of Anpressschläuchen 12, 13 is now provided on one side as a pressing element realized by a spring 21 resilient element.
  • FIG. 3 shows a further embodiment of a scraper device 22 according to the invention. For the sake of clarity, only the differences are intended to the scraper device 1 of Figure 1 will be discussed. Same objects are provided with the same reference numerals.
  • the scraper device 22 of Figure 3 differs by that of Figure 1 essentially in that the two formed as Anpressschläuche 12, 13 pressing elements in contrast to Figure 1 is not attached to the second holder member 5, or its base plate 9, but with the first holder element 4 or are firmly connected to its cover plate 6 so that, as a result, when the scraper blade 18 moves transversely to the machine direction, the scraper blade 18, the cover plate 6 and the two pressure hoses 12, 13 move together relative to the base plate 9 of the second holder element 5.

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  • Paper (AREA)
EP06115872A 2005-07-23 2006-06-22 Appareil de raclage Withdrawn EP1746206A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510034452 DE102005034452A1 (de) 2005-07-23 2005-07-23 Schabervorrichtung

Publications (1)

Publication Number Publication Date
EP1746206A1 true EP1746206A1 (fr) 2007-01-24

Family

ID=37241127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06115872A Withdrawn EP1746206A1 (fr) 2005-07-23 2006-06-22 Appareil de raclage

Country Status (2)

Country Link
EP (1) EP1746206A1 (fr)
DE (1) DE102005034452A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009007473A1 (fr) 2007-07-11 2009-01-15 Amonarriz Azcolain Jose Joaqui Appareil de raclage pour l'industrie papetière
EP2141284A3 (fr) * 2008-06-20 2011-05-18 Joh. Clouth GmbH & Co. KG Dispositif de retenue de lame de racloir
WO2014176597A1 (fr) 2013-04-26 2014-10-30 Kadant Inc. Systèmes et procédés permettant de fournir des porte-racles présentant une atténuation des vibrations

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544557A (en) * 1945-03-01 1951-03-06 Messrs Walmsleys Bury Ltd Oscillating doctor for paper machines
WO2000046446A1 (fr) 1999-02-03 2000-08-10 Metso Paper, Inc. Equipement a racles relie a un rouleau/cylindre dans une machine a papier/a carton
US20020040774A1 (en) * 2000-10-11 2002-04-11 Dennis Louis E. Oscillating doctor blade holder
US6447646B1 (en) 1999-02-03 2002-09-10 Metso Paper, Inc. Doctor assembly in a paper machine with a jointed bearing
WO2004042143A1 (fr) * 2002-11-08 2004-05-21 Helmut Strauch Dispositif de retenue de lame de racloir

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544557A (en) * 1945-03-01 1951-03-06 Messrs Walmsleys Bury Ltd Oscillating doctor for paper machines
WO2000046446A1 (fr) 1999-02-03 2000-08-10 Metso Paper, Inc. Equipement a racles relie a un rouleau/cylindre dans une machine a papier/a carton
US6447646B1 (en) 1999-02-03 2002-09-10 Metso Paper, Inc. Doctor assembly in a paper machine with a jointed bearing
US20020040774A1 (en) * 2000-10-11 2002-04-11 Dennis Louis E. Oscillating doctor blade holder
WO2004042143A1 (fr) * 2002-11-08 2004-05-21 Helmut Strauch Dispositif de retenue de lame de racloir

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009007473A1 (fr) 2007-07-11 2009-01-15 Amonarriz Azcolain Jose Joaqui Appareil de raclage pour l'industrie papetière
US7972481B2 (en) 2007-07-11 2011-07-05 Jose Joaquin Amonarriz Azcolain Scraping apparatus for the paper industry
EP2141284A3 (fr) * 2008-06-20 2011-05-18 Joh. Clouth GmbH & Co. KG Dispositif de retenue de lame de racloir
WO2014176597A1 (fr) 2013-04-26 2014-10-30 Kadant Inc. Systèmes et procédés permettant de fournir des porte-racles présentant une atténuation des vibrations
EP2989245A4 (fr) * 2013-04-26 2016-10-05 Kadant Inc Systèmes et procédés permettant de fournir des porte-racles présentant une atténuation des vibrations
US11834790B2 (en) 2013-04-26 2023-12-05 Kadant Inc. Systems and methods for providing doctor blade holders with vibration mitigation

Also Published As

Publication number Publication date
DE102005034452A1 (de) 2007-01-25

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