EP1186703A2 - Dispositif de raclage - Google Patents

Dispositif de raclage Download PDF

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Publication number
EP1186703A2
EP1186703A2 EP01118943A EP01118943A EP1186703A2 EP 1186703 A2 EP1186703 A2 EP 1186703A2 EP 01118943 A EP01118943 A EP 01118943A EP 01118943 A EP01118943 A EP 01118943A EP 1186703 A2 EP1186703 A2 EP 1186703A2
Authority
EP
European Patent Office
Prior art keywords
blade
carrier
arrangement according
axis
holder
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.)
Granted
Application number
EP01118943A
Other languages
German (de)
English (en)
Other versions
EP1186703B1 (fr
EP1186703A3 (fr
Inventor
Josef Schneid
Thomas Wöhner
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1186703A2 publication Critical patent/EP1186703A2/fr
Publication of EP1186703A3 publication Critical patent/EP1186703A3/fr
Application granted granted Critical
Publication of EP1186703B1 publication Critical patent/EP1186703B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades
    • 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 arrangement with a Doctor blade and a blade holder.
  • Such a scraper arrangement is from DE 199 55 569 A1 known.
  • Such a scraper arrangement is used, for example of paper making used to roll over which is guided by a paper web To clean cockroaches.
  • Another application is also used in a paper production Coater.
  • the invention is as follows related to cleaning a calender roll described in the paper finishing, but without it to be limited.
  • the paper web must be used for paper production or finishing passed through a calender, i.e. one Stack of several rollers, nips between them form in which the paper web with increased pressure and possibly also subjected to an elevated temperature becomes. It is practically inevitable that smaller or larger particles from the paper web be deposited on the surface of the calender roll. Around to prevent these deposits from following Imprint sections of the paper web into these a scraper is used, which lies against the roller. Due to the rotation of the roller, the roller surface becomes Continuously on the doctor blade, which also works as a doctor blade is referred to, moved along so that deposits are scraped off the roller surface.
  • the rollers used in papermaking must have approximately the width of the paper web. That breadth is in the range of several meters, for example in the range of 5 to 10 m. Accordingly the scraper blade must also have an appropriate length exhibit.
  • the scraper blade must be as long as possible lie evenly on the roller. This is in usually achieved by using the doctor blade presses against the roller with a relatively large pressure.
  • the invention is based, even minor To enable contact pressures.
  • This task is at the beginning of a scraper arrangement mentioned type solved in that the blade carrier has a stiffness in the width direction is at least 1.5 times as large as in the longitudinal direction.
  • the longitudinal direction is the direction that is parallel runs to the axis of the roller to be scraped.
  • the Width direction is the direction across, i.e. the Direction that is substantially parallel to a tangent runs to the roller to be scraped. Because of the special Choice of stiffnesses that the Stiffness across the roll axis is relatively large, so that you have a pressure of the doctor blade on the Roller that is exerted over the blade carrier, practical "lossless" can be transferred to the roller while in the longitudinal direction of the roller an adaptation to the Roll geometry, e.g. a little bombage, because of that lower rigidity of the blade support in the longitudinal direction is easily possible. One is therefore no longer relying on the doctor blade with one if possible big pressure against the roller, but one can get by with smaller pressures.
  • the doctor blade which itself is relatively flexible can change due to the deformability of the blade carrier in the longitudinal direction to adjust.
  • the blade carrier is preferably made of a fiber-reinforced one Plastic formed.
  • reinforcing fibers come for example carbon fibers, glass fibers or also Plastic fibers into consideration.
  • the desired ratio of fibers can be Set stiffnesses in the longitudinal and width directions.
  • the blade carrier preferably has a lengthwise direction constant profile. This changes the Practical stiffness in the width direction over the length Not. The contact pressure of the doctor blade against the roller can be kept even over the length of the roller become.
  • the blade carrier is preferably about an axis arranged pivotably on a blade holder, wherein between the blade holder and the blade holder at least a pressure element is arranged that is independent is self-similar from the pressure.
  • This pressure element can then also used in connection with the scraper arrangement if the above stiffness ratios are not given.
  • Pressure elements are formed from tubes, which in the essentially have an oval cross section. This oval cross-section is flattened on the sides, where the hose on the blade holder and on the blade carrier is applied.
  • the basic Shape is preserved. In this way you achieve a quasi hysteresis-free Effect of the pressure element, i.e. the to be applied Forces between the blade holder and blade carrier can be largely independent of distance between blade carrier and blade holder become.
  • the self-similar elements can also be used find if the stiffness ratios on Blade carriers have been chosen differently than specified above are.
  • a pressure element on both sides of the axis arranged. You can then use the printing elements not only use the desired contact pressure to produce the doctor blade on the roller, but also for generating a back pressure, for example for lifting the scraper blade from the roller can be used.
  • the pressure element is preferably a hose with a Indentation on its facing the blade carrier Page trained in the one with the blade holder interacting plunger engages.
  • the hose points that is, a cross-section similar to a bellows extends over the entire length of the blade holder. If the hose is pressurized, then the plunger is pushed away from the blade holder because the depth of the indentation decreases.
  • the basic Shape of the pressure element as a tube with indentation but remains over the entire range of motion of the pestle. Because the ram in the indentation forms an abutment for the hose, results there is also a relatively high level of dimensional stability.
  • the indentation preferably has a state of equilibrium, in which the blade carrier and the blade holder are aligned parallel to each other, a Depth at least 30% of the height of the pressure element equivalent. This depth is sufficient to also the maximum permissible pivoting between the blade holder and blade carrier the indentation in the hose maintain. Usually you will see the depth of the Choose indentation so that a swivel between the blade holder and the blade holder by the length the plunger is not limited.
  • the plunger preferably extends further in the direction on the blade holder as the distance between Blade carrier and axis. This applies to the above Equilibrium. Result in this arrangement yourself favorable moments.
  • the hose has on the sides that do not have the indentation, a shape-stabilizing Support on.
  • the indentation only present on the top of the hose.
  • the bottom and the other two sides (in cross section considered) do not change shape and can therefore be braced.
  • the support formed by a U-shaped shape on the blade holder is. So the hose is in a U-shaped Recess on the blade holder. He will only be at his Blade carrier facing side deformed, the Deformation is essentially limited to the indentation is.
  • the pressure element designed as an eccentric, parallel to the axis is rotatable. By turning the eccentric the distance between the blade holder and the blade carrier change and the desired contact pressure of the Generate doctor blade on the roller. If you have such Eccentric used on both sides of the axis, then you can set the desired geometries.
  • the eccentric is preferably mounted on a shaft, which can be operated from outside the blade holder is. This makes adjustment easier.
  • the shaft is spring-loaded is.
  • About the spring can be at least one Part of the range of the rotary positions of the eccentric a certain flexibility even with an eccentric bearing achieve.
  • the pressure element is as Spring designed with adjustable preload.
  • a spring is an element that changes its shape when loaded changes, but remains the same. at Using a spring gives the possibility of one Movement between the blade holder and blade carrier against the force exerted by the spring, this Force is adjustable.
  • the spring is preferably designed as a spring leaf, that in the area of an edge on a rotatable shaft is attached. By turning the shaft, the Change the contact force of the spring leaf on its counter surface.
  • This counter surface can, for example, by the Blade carriers are formed when the shaft is on the blade holder is arranged, or vice versa.
  • the free edge is preferably removed the scraper blade from the axis at least five times a distance between the axis and the force application of the pressure element remote from the blade.
  • This configuration has the advantage that the doctor blade with a relatively low Force or with a relatively low pressure the roller can be brought into contact.
  • the lever between the contact point of the doctor blade on the roller and the axis is much larger than the lever between the pressure element responsible for the system pressure and the axis so that at the minimum distance the doctor blade with a fifth of the force on the Roller is pressed, which applies the pressure element.
  • the scraper blade preferably has a free one Width that is maximally as large as 2.5 times a distance between the blade end of the Blade carrier and a clamping point of a blade holder.
  • the distance between the nip and the blade-side end of the blade carrier is basically the main influencing factor for the power transmission from Blade holder on the doctor blade. If you now the free width of the very flexible doctor blade limited, then you get a relatively large one here Stiffness in the width direction.
  • the blade holder preferably has an effective one Opening that is maximally as large as 2 times the thickness of the doctor blade. So you keep the goal the scraper blade in the blade holder is small but on the other hand threading the doctor blade in the blade holder.
  • the scraper blade advantageously has a holding width that is at least as large as the distance between the clamping point and the blade side End of the blade holder.
  • the holding width is here the width over which the scraper blade in the blade holder is supported, i.e. the distance between the clamping point of the blade holder and the roller remote End of the doctor blade.
  • the blade holder is preferably from the blade carrier hinged. This makes it easier to replace the Scraper blade. When replacing the blade holder folded. The doctor blade can be removed a new or revised doctor blade is put on and the blade holder is closed again or closed. This is much easier than the doctor blade over a length of several meters to be inserted lengthways.
  • the blade holder lockable with the blade holder when closed is. This increases operational security.
  • a locking device preferably extends through the blade holder.
  • the one facing away from the blade holder Side of the blade carrier is usually accessible, so that you have free access in this embodiment has on the locking device. This makes it easier locking and subsequent control.
  • Fig. 1 shows a scraper arrangement 1 in schematic Cross-section.
  • the scraper arrangement has a scraper blade 2, which are also referred to as scraper blades can, which rests on a roller 3, which is in Direction of an arrow 4 rotates.
  • the doctor blade 2 extends over the entire axial length of the roller 3, if necessary, it can also be a little longer to to be able to oscillate with respect to the roller 3.
  • the doctor blade 2 is arranged in a blade holder 5, which is at the roller-side end of a blade carrier 6 is located.
  • the blade carrier 6 is on one Blade holder 7 fastened and articulated, i.e. the Blade carrier 6 is opposite to the blade holder 7 an axis 8 pivotable.
  • the blade carrier 6 is essentially plate-shaped educated. It consists of a fiber-reinforced Plastic, i.e. a plastic made of carbon fibers, Glass fibers or plastic fibers is reinforced. With this reinforcement you can get a stiffness in Reach width direction that is at least 1.5 times as much is as large as in the longitudinal direction. If the blade holder around the axis 8 clockwise (based on the Fig. 1) is pivoted, then the blade carrier 6 due to its relatively high stiffness s a contact pressure practically without changes, so almost “lossless” transferred to the doctor blade 3. Because the rigidity of the blade support 6 but lower in the longitudinal direction is, the scraper line 2 and also the Blade carrier 6 in the longitudinal direction to the contour of the roller 3 adjust, for example, be a bit domed can.
  • a fiber-reinforced Plastic i.e. a plastic made of carbon fibers, Glass fibers or plastic fibers is reinforced. With this reinforcement you can get a stiffness in Reach width direction that is at least 1.5 times as much is as large
  • the blade carrier 6 is made of plastic he is comparatively light in weight. This is a Influencing variable that leads to the doctor blade with a comparatively low pressure on the roller 3 Plant can be brought.
  • the system pressure can be increased arbitrarily within certain limits. Important is, however, that you can also use very small system pressures can achieve.
  • both pressure elements 9, 10 are arranged.
  • the force application point both pressure elements 9, 10 is essentially equidistant from axis 8.
  • Each pressure element 9, 10 is designed as a hose, which in a substantially U-shaped receptacle 11 Blade holder is arranged. If the hose is under Pressure is set, then it takes the shape of the inner contour the recording 11. Points to its free side the hose has an indentation 12 into which a plunger 13 engages, which is attached to the blade carrier 6.
  • the Ram 13 can be formed, for example, by a bar be the entire length of the blade support 6 extends.
  • the depth of the indentation 12 is at least 30% one Height h that the pressure element 9, 10 in a state of equilibrium which is defined by that the blade carrier 6 and the blade holder 7 in parallel are aligned with each other. In the present embodiment the depth of the indentation 12 is even greater than 50% of the height h.
  • the depth of the indentation 12 and the corresponding one Extension of the plunger 13 can be relatively large be made.
  • a limit is formed by the fact that the pivotability of the blade support 6 compared the blade holder 7 should not be limited thereby, that the plunger 13 abuts the blade holder 7.
  • the extension of the plunger 13 in the direction of the Blade holder 7 is greater than the distance from the Axis 8 from the blade carrier 6. This leads to cheap ones Moments when pivoting the blade carrier opposite the blade holder.
  • the scraper blade is positioned in the blade holder 5 in such a way that their projected extension 14 through axis 8 runs. A slight deviation after above, i.e. towards the blade carrier 6 is permitted. If the extension of the doctor blade 2 by the Axis 8 runs, then contaminants that are on the surface of the roller 3 in the direction of arrow 4 be introduced, not a moment on the blade carrier Exercise 6 opposite to a tilting of the blade support 6 the blade holder 7 could lead. If the Extension 14 runs somewhat above axis 8, then the blade support 6 can at best something be pivoted clockwise so that the Doctor blade 2 lifted off the surface of the roller 3 becomes. However, it cannot happen that the blade holder 6 pivoted in the clockwise direction becomes. This would lead to the risk that the Scraper blade 2 digs into the surface of the roller 3.
  • the blade holder 5 forms with the blade carrier 6 a clamping point 15 in which the doctor blade 2 is held becomes.
  • a gap 16 In the nip is between the blade holder 5 and the blade carrier 6 formed a gap 16, whose thickness is a maximum of twice the thickness s the doctor blade is 2, i.e. e ⁇ 2 x s.
  • the doctor blade 2 has a free blade width d in which it is not supported on either side. On this free blade width d closes a support area c between the blade end of the Blade carrier 6 and the clamping point 15 is formed.
  • d For the ratio of the support of the doctor blades 3 applies d ⁇ 2.5 x c. This dimensioning gives a good one Stiffness of the doctor blade 2 when pressed on the roller 3.
  • the doctor blade 2 via a Support length f held in the blade holder 5. In order to prevent the scraper blade 2 when lifting off the roller 3 tilts too much or folds down, that applies Ratio f> 1 x c.
  • the removal of the roller end the scraper blade 2 from the axis 8 at least five times as large as the distance of the axis 8 from the force application point of the blade element 9 remote from the blade of the leverage ratio is the investment power of Doctor blade 2 on the roller 3 at most 1/5 of the force, which is applied by the pressure element 9.
  • Fig. 2 shows another way of how to apply forces between the blade carrier 6 and the blade holder 7 can adjust.
  • the same parts are the same Provide reference numerals. The representation is only schematically.
  • each on Shafts 19, 20 are arranged and with the shafts 19, 20th in the direction of arrows 21, 22 or opposite thereto can be pivoted.
  • the shafts 19, 20 are from outside the blade support / blade holder assembly actuated. They can be spring loaded be so that between the blade carrier 6 and the blade holder 7 a certain bias results.
  • Fig. 3 shows a further embodiment in which the Pressure element between the blade carrier 6 and the blade holder 7 is formed by a flexible spring element 23, for example in the form of a pre-bent Leaf spring can be formed.
  • the spring element 23 is attached to a shaft 24 which is in the direction an arrow 25 can be rotated. By twisting the shaft 24 can be the bias of the spring element 23 between the blade carrier 6 and the blade holder 7 set.
  • a foldable blade holder 5 is shown.
  • the blade holder is on the blade carrier 6 movably mounted and pivotable about an axis 26.
  • a locking device shown only schematically 27 passes through the blade carrier 6 at least then when the blade holder 5 is in its closed Position (shown in solid lines) has been pivoted.
  • the locking device can, for example, by a screw bolt be formed, which is then from the top of the blade support 6 ago is provided with a nut.
  • the locking device 27 can also by one Pen are formed, which is guided by the blade carrier becomes.
  • the pin can have an opening through which a pin is put. If the blade holder 5 is opened, then the replacement a scraper blade greatly relieved.
  • the blade holder 7 is usually on a doctor bar attached, which in turn is usually pivotable is stored in the stand of the calender. Apart from this, that the scraper beam is in the correct scraper arrangement Holds position so that the doctor blade on the to scraping roller can be applied, the scraper bar also used to put the doctor blade in an exchange position to pivot.
  • a first solution is for Blade holder 7 and the scraper beam materials with im use essentially the same thermal expansion.
  • the blade carrier 7 and the scraper bar be tempered, for example with suitable Temperature control devices to the different Counteract thermal expansion.
  • a relatively simple measure is that one the blade carrier 6 opposite the blade holder 7 in essentially set in the middle of the longitudinal extent, the ends of the blade carrier only over floating bearings attached to the blade holder. Under these circumstances the blade carrier can grow or shrink without that tensions are generated in the system. additionally you can segment the blade holder 7 in the longitudinal direction, where each segment has a limited longitudinal extent has and is firmly connected to the scraper beam. The blade carrier is then opposite one of the middle ones Fixed segments, compared to the other segments but only held with a floating bearing. Will be realized This can be done, for example, in that the axis 8 relative to the blade holder 7 in the longitudinal direction freely can expand. The segments of the blade holder 7 have sufficient distance from each other in the longitudinal direction, so that growth or shrinkage of the components does not increase Leads to tension.

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EP20010118943 2000-08-25 2001-08-04 Dispositif de raclage Expired - Lifetime EP1186703B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20014746U DE20014746U1 (de) 2000-08-25 2000-08-25 Schaberanordnung
DE20014746U 2000-08-25

Publications (3)

Publication Number Publication Date
EP1186703A2 true EP1186703A2 (fr) 2002-03-13
EP1186703A3 EP1186703A3 (fr) 2002-09-18
EP1186703B1 EP1186703B1 (fr) 2005-11-09

Family

ID=7945675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010118943 Expired - Lifetime EP1186703B1 (fr) 2000-08-25 2001-08-04 Dispositif de raclage

Country Status (2)

Country Link
EP (1) EP1186703B1 (fr)
DE (2) DE20014746U1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008022096A1 (fr) * 2006-08-16 2008-02-21 Kadant Web Systems, Inc. Racle permettant l'assemblage efficace d'ensembles doseurs, et remplacement de des racles
US7665178B2 (en) 2002-11-08 2010-02-23 Joh. Clouth Gmbh & Co. Kg Scraper blade mounting device
US8321992B2 (en) 2007-12-06 2012-12-04 Kadant Web Systems, Inc. Integrated doctor blade holders

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20014746U1 (de) * 2000-08-25 2000-10-19 Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim Schaberanordnung
DE20212745U1 (de) * 2002-08-20 2002-10-17 Voith Paper Patent GmbH, 89522 Heidenheim Schaberanordnung
DE102022113503A1 (de) * 2022-05-30 2023-11-30 Voith Patent Gmbh Schaberhalter und Schabvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0485597A1 (fr) * 1990-05-15 1992-05-20 Aikawa Iron Works Co., Ltd. Raclette
DE9113542U1 (de) * 1991-10-31 1992-06-17 J.M. Voith Gmbh, 7920 Heidenheim Schaber
GB2265917A (en) * 1992-04-10 1993-10-13 Vickerys Ltd A mounting assembly for a blade
DE20014746U1 (de) * 2000-08-25 2000-10-19 Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim Schaberanordnung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0485597A1 (fr) * 1990-05-15 1992-05-20 Aikawa Iron Works Co., Ltd. Raclette
DE9113542U1 (de) * 1991-10-31 1992-06-17 J.M. Voith Gmbh, 7920 Heidenheim Schaber
GB2265917A (en) * 1992-04-10 1993-10-13 Vickerys Ltd A mounting assembly for a blade
DE20014746U1 (de) * 2000-08-25 2000-10-19 Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim Schaberanordnung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7665178B2 (en) 2002-11-08 2010-02-23 Joh. Clouth Gmbh & Co. Kg Scraper blade mounting device
WO2008022096A1 (fr) * 2006-08-16 2008-02-21 Kadant Web Systems, Inc. Racle permettant l'assemblage efficace d'ensembles doseurs, et remplacement de des racles
US7867364B2 (en) 2006-08-16 2011-01-11 Kadant Inc. Doctor blade holder permitting efficient assembly of doctor assemblies and replacement of doctor blades
CN101506435B (zh) * 2006-08-16 2012-06-06 卡当特网络系统股份有限公司 允许高效地组装刮刀组件和更换刮刀刀片的刮刀刀片固定器
US8321992B2 (en) 2007-12-06 2012-12-04 Kadant Web Systems, Inc. Integrated doctor blade holders

Also Published As

Publication number Publication date
EP1186703B1 (fr) 2005-11-09
EP1186703A3 (fr) 2002-09-18
DE50107966D1 (de) 2005-12-15
DE20014746U1 (de) 2000-10-19

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