EP2691571A1 - Pressure-zone regulation for a scraper - Google Patents
Pressure-zone regulation for a scraperInfo
- Publication number
- EP2691571A1 EP2691571A1 EP12717221.1A EP12717221A EP2691571A1 EP 2691571 A1 EP2691571 A1 EP 2691571A1 EP 12717221 A EP12717221 A EP 12717221A EP 2691571 A1 EP2691571 A1 EP 2691571A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- scraper
- contact pressure
- pressure
- actual
- length
- 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
Links
- 230000033228 biological regulation Effects 0.000 title description 2
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000006378 damage Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0036—Paper-making control systems controlling the press or drying section
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0045—Paper-making control systems controlling the calendering or finishing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2235/00—Cleaning
- B41P2235/10—Cleaning characterised by the methods or devices
- B41P2235/20—Wiping devices
- B41P2235/21—Scrapers, e.g. absorbent pads
Definitions
- the invention relates to a device for pressure zone controlled pressing a scraper for cleaning smooth surfaces, especially for surfaces of rollers, as used in the paper, board and cardboard industry and in the
- a device according to claim 1 Preferred embodiments of the invention are the subject of the dependent claims.
- the device according to the invention for pressure-zone-controlled cleaning of smooth surfaces is characterized in a particular embodiment in that the contact pressure can be regulated locally variably.
- the device according to the invention preferably further comprises a detection and control system for the actual contact pressure of the scraper over its length.
- the contact pressure of the scraper is regulated by means of the data of the detection system.
- the contact pressure control by means of a
- the pressure detection takes place by means of a piezoelectric system or a
- Measured variables such as the change in resistance of a Wheatstone bridge or on optical strain gauges.
- systems based on the principle of Bragg gratings can be understood as optical strain gauges.
- a principle is understood in which a control variable occurring in a technical system and principally variable variables in a predetermined range is attempted to be kept constant.
- disturbances or changes in a substantially closed system are compensated for by the control.
- Control is understood as a method in which certain target values are specified in an open system, but in particular an automatic one
- a "pseudo-regulation" is often realized in the art by the interposition of operating personnel.
- knife-like scraper are applied to the rollers.
- the scrapers have a blade which encloses an angle of usually between 8 ° and 40 ° with a tangent applied to the surface of the roller in the area of contact.
- the scrapers for example, made of metal, plastic or composites or composite materials.
- the contact pressure as in this connection the contact force per unit length of the scraper is referred to, is normally between 50 and 500 N / m and is generated by the weight of the scraper, the scraper holder, etc. and / or by hydraulic and / or mechanical means , There is no variable
- strain gauges which are arranged at preferably regular intervals over the extension of a measuring scraper extending parallel to the roller length and are connected via measuring lines to an evaluation device.
- a doctor blade device is described in EP 1 259 377 B1. Online options for recording contact pressure are still missing today.
- the degree of wear of the scrapers used varies both across the width of the scraper, recognizable as a wear profile, and absolutely per use time, depending on the wear characteristics of the scraper Scraper material.
- the lengths of the rollers and thus also the scrapers are typically between 1 m and 13 m.
- the object of the present invention is to reduce the problems known in the prior art.
- Particular embodiments also serve to provide a device which makes it possible to detect the profiles of scrapers in a manner independent of the length of the respective scraper, and preferably to digitally store or condition it.
- the profiles thus acquired should then be able to be adjusted by locally variable change of the contact pressure of the form of the contact pressure profile desired by the operator. It should u.a.
- a device can be provided which allows the detection of the values easier and cheaper than the technology used today for this purpose and additionally the correction of a bad
- a preferred embodiment uses a plurality of independently acting measuring devices and control devices for locally variable control of the contact pressure profile, which are arranged in particular in the longitudinal direction of the scraper.
- the distances of the control units between 30 mm to 1000 mm, preferably 50 mm to 300 mm, more preferably 75 mm to 200 mm and in particular 100 mm to 150 mm.
- a particularly preferred embodiment of the solution of the problem posed enables the detection of the contact pressure by means of strain gauges (DMS) or optical or piezoelectric methods and the regulation of the contact pressure by means of electrically, thermally, pneumatically or hydraulically operated drives such as spindle drives.
- DMS strain gauges
- optical or piezoelectric methods and the regulation of the contact pressure by means of electrically, thermally, pneumatically or hydraulically operated drives such as spindle drives.
- the thermal powered drives are systems which have an expanding heating element, for example
- Electric or electromotive drives preferably work with motors and can be connected, for example, directly or by means of a bus (data transmission).
- Pneumatic drives work preferably with compressed air, by means of which directly or through a
- the pressure regulating device mounted in the region of the contact pressure sensor is activated and the pressure locally increased at low contact pressure or locally reduced at too high contact pressure.
- the scraper can also be automatically drawn into the scraper holding device via motor-driven rollers and pushed out again in order to reduce the risk of injury to the operating personnel.
- the user must during the automated measurement and control of the scraper contact pressure not be present. As there are no massive slumps in the
- Guide rollers and the motorized rollers each stripes of a material with an increased tack (frictional resistance) applied to prevent slipping on the smooth surface of the scraper.
- the surface of the scraper can be equipped by roughening against a too smooth surface.
- a measuring method for determining the scraper contact pressure and / or the subsequent control can be an electromechanical control, or the
- a further embodiment variant of the invention provides that the detection of the contact pressure profile profile takes place with the aid of optical detection methods, for example by using sensors based on Bragg gratings or other optical strain gauges.
- sections of the scraper not only at least partially understood mechanically separate sections, but these also result from the assignment of a one-piece scraper to the respective contact pressure element and the resulting therefrom
- the acquisition of the measured data can be done with the help of a common
- Data collection programs such as Lab View® or other programs based on C ++ or Java or Python, just to name a few.
- FIG. 1 shows a good doctor pressure profile at variable contact pressures.
- the top line (inter alia at point 18) corresponds to the contact pressure of 2.5 bar proposed in the production by the manufacturer of the doctor blade holder. The lowest line is the resultant at a contact pressure of 1, 0 bar.
- FIG. 2 shows a poor doctor pressure profile at variable contact pressures.
- the middle line (at point 15, the second line from the top) corresponds to the contact pressure proposed by the manufacturer of the scraper holder during production.
Landscapes
- Paper (AREA)
- Coating Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011001645 | 2011-03-29 | ||
PCT/EP2012/055568 WO2012130910A1 (en) | 2011-03-29 | 2012-03-28 | Pressure-zone regulation for a scraper |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2691571A1 true EP2691571A1 (en) | 2014-02-05 |
EP2691571B1 EP2691571B1 (en) | 2017-06-28 |
Family
ID=46017804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12717221.1A Active EP2691571B1 (en) | 2011-03-29 | 2012-03-28 | Pressure-zone regulation for a scraper |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2691571B1 (en) |
WO (1) | WO2012130910A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022113503A1 (en) * | 2022-05-30 | 2023-11-30 | Voith Patent Gmbh | Scraper holder and scraper device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2445135A (en) * | 1944-12-18 | 1948-07-13 | Scott Paper Co | Doctor holder |
DE50101707D1 (en) | 2001-01-18 | 2004-04-22 | Alfred Simonetti | SCRAPER FOR CLEANING A ROTATING ROLLER |
DE102008001265A1 (en) * | 2008-04-18 | 2009-10-22 | Voith Patent Gmbh | Scraper device and squeegee device |
-
2012
- 2012-03-28 WO PCT/EP2012/055568 patent/WO2012130910A1/en active Application Filing
- 2012-03-28 EP EP12717221.1A patent/EP2691571B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012130910A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012130910A1 (en) | 2012-10-04 |
EP2691571B1 (en) | 2017-06-28 |
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