EP2691571B1 - Pressure-zone regulation for a scraper - Google Patents

Pressure-zone regulation for a scraper Download PDF

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Publication number
EP2691571B1
EP2691571B1 EP12717221.1A EP12717221A EP2691571B1 EP 2691571 B1 EP2691571 B1 EP 2691571B1 EP 12717221 A EP12717221 A EP 12717221A EP 2691571 B1 EP2691571 B1 EP 2691571B1
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EP
European Patent Office
Prior art keywords
scraper
contact pressure
pressure
regulated
length
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EP12717221.1A
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German (de)
French (fr)
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EP2691571A1 (en
Inventor
Tobias Kleemann
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Pacon Ltd & Co KG
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Pacon Ltd & Co KG
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    • 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 the pressure-zone-controlled pressing of a scraper for cleaning smooth surfaces, in particular for surfaces of rolls, as used in the paper, board and cardboard industry and in the printing industry.
  • 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 an electromechanical control and in particular by means of a hydraulic control.
  • the contact pressure control can also be effected by means of thermocouples or by means of elements which change their dimension due to heat or cold.
  • the individual elements and control systems can also be combined with each other.
  • the pressure detection is carried out with the aid of a piezoelectric system or a mechanical strain gauge, preferably based on electrical parameters such as e.g. the change in resistance of a Wheatstone bridge or on optical strain gauges.
  • electrical parameters such as e.g. 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 feedback for changing the manipulated variable does not occur. From an open control system, a "pseudo-regulation" is often realized in the art by the interposition of operating personnel.
  • scrapers For cleaning, for example, in paper machines or in printing units rotating rollers 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 roll 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.
  • measuring scrapers comprise, for example, strain gauges which are arranged at preferably regular intervals over the extension of a measuring scraper running parallel to the roller length and are connected to an evaluation device via measuring lines.
  • Such a doctor blade device is in the EP 1 259 377 B1 described. 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 less expensive than the technology used today for this purpose and additionally allows the correction of a poor contact pressure profile.
  • the production losses due to problems with scrapers should be reduced and, in particular, the follow-up costs for problems with insufficiently pressing scrapers should be largely automatically and safely avoidable for the user.
  • 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 when, for example, voltage is applied to the heating element.
  • 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 preferably work with compressed air, by means of which the movement is effected directly or by a lever transmission.
  • the scraper to be controlled by means of rollers or guide rails fixed in a fixed position.
  • a mounted on the back or front DMS or one or more attached in the region of the pressure fingers piezoelectric sensors allows the detection of the locally applied scraper contact pressure.
  • the data thus obtained are processed either locally or centrally electronically elsewhere. If the contact pressure value obtained deviate from the specified target value, 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. Since there can be no massive collapse of the Schaberanpress horrs, today's usual follow-up costs and damage are largely avoidable.
  • strips of a material having an increased tack are applied to the scraper to be measured for increasing the lateral frictional resistance over the entire length of the scraper on both sides in the amount of the movable lateral guide rollers and the motor-driven rollers 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 find the pressure detection using a mechanical or optical strain gauge.
  • 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.
  • portions 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 and the resulting possibility of change of the contact pressure in a particular section of the scraper.
  • the acquisition of measurement data can be done using a common data collection program such as Lab View® or other programs based on C ++ or Java or Python, just to name a few.
  • Fig. 1 and 2 show a good and a poor scraper pressure profile from a paper machine.
  • FIG. 1 is a good Schaberanpressdruckprofil shown 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 is a poor Schaberanpressdruckprofil shown 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.

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Description

Die Erfindung betrifft eine Vorrichtung zur druckzonengeregelten Anpressung eines Schabers für die Reinigung glatter Oberflächen insbesondere für Oberflächen von Walzen, wie sie in der Papier-, Pappe und Kartonindustrie sowie in der Druckindustrie verwendet werden.The invention relates to a device for the pressure-zone-controlled pressing of a scraper for cleaning smooth surfaces, in particular for surfaces of rolls, as used in the paper, board and cardboard industry and in the printing industry.

Im Stand der Technik sind Vorrichtungen und Systeme zur Reinigung von Walzen bekannt. So werden im Stand der Technik Schaber eingesetzt, die in entsprechenden Halterungen aufgenommen an eine Oberflächen angelegt werden, um diese von oberflächlichen Verunreinigungen zu säubern. Nachteilig hierbei ist es jedoch, dass die Schaber selten wenn überhaupt gleichmäßig auf der Oberfläche anliegen und hierdurch insbesondere der Verschleiß sehr unterschiedlich über die Länge des Schabers ist. Abgesehen vom unterschiedlichen Schaberverschleiß erzeugen unterschiedliche Schaberanpressdrücke auch eine unterschiedlich gute Reinigung der Oberflächen, was zu unterschiedlichen Ablagerungsdicken und damit zu unterschiedlichen Wärmeübergängen bei der Trocknung und damit auch zu Schwankungen in der Feuchte des Produktes führt.In the prior art devices and systems for cleaning of rollers are known. Thus, scrapers are used in the prior art, which are taken in appropriate holders applied to a surface to clean them of superficial impurities. The disadvantage here, however, is that the scrapers seldom, if at all, rest evenly on the surface, and as a result, in particular, the wear is very different over the length of the scraper. Apart from the different scraper wear different Schaberanpressdrücke also produce a different good cleaning of the surfaces, which leads to different deposition thicknesses and thus to different heat transfer during drying and thus to fluctuations in the humidity of the product.

So ist im Stand der Technik unter anderem die EP 2 113 608 A2 bekannt, welche eine Schaber- und Rakelvorrichtung betrifft. Hierin wird unter anderem eine Vorrichtung offenbart, bei welcher der tatsächliche Anpressdruck in vorgegebenen Abschnitten über die Länge des Schabers erfasst wird.So is in the prior art, inter alia, the EP 2 113 608 A2 known, which relates to a scraper and squeegee device. Herein, inter alia, a device is disclosed in which the actual contact pressure in predetermined sections over the length of the scraper is detected.

Ausgehend von diesem Problem ist es Aufgabe der vorliegenden Erfindung, eine Vorrichtung und ein Verfahren bereit zu stellen, mit welchem die im Stand der Technik bekannten Probleme wenigstens teilweise gelöst werden können.Starting from this problem, it is an object of the present invention to provide an apparatus and a method with which the problems known in the prior art can be at least partially solved.

Gelöst wird diese Aufgabe durch eine Vorrichtung gemäß Anspruch 1 und durch ein Verfahren gemäß Anspruch 4. Bevorzugte Ausführungsformen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by a device according to claim 1 and by a method according to claim 4. Preferred embodiments of the invention are the subject of the dependent claims.

Die erfindungsgemäße Vorrichtung zur druckzonengeregelten Reinigung glatter Oberflächen ist in einer besonderen Ausführungsform dadurch gekennzeichnet, dass der Anpressdruck örtlich variabel geregelt werden kann.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.

Die erfindungsgemäße Vorrichtung umfasst ferner vorzugsweise ein Erfassungs- und Regelungssystem für den tatsächlichen Anpressdruck des Schabers über dessen Länge.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.

Gemäß einer weiteren Ausführungsform wird der Anpressdruck des Schabers mittels den Daten des Erfassungssystems geregelt.According to a further embodiment, the contact pressure of the scraper is regulated by means of the data of the detection system.

Vorzugsweise erfolgt die Anpressdruck-Regelung mit Hilfe einer elektromechanischen Regelung und insbesondere mit Hilfe einer hydraulischen Regelung. Alternativ kann die Anpressdruck-Regelung auch mittels Thermoelementen bzw. mittels Elementen erfolgt, die sich aufgrund von Wärme bzw. Kälte ihre Dimension verändern. Selbstverständlich können die einzelnen Elemente und Regelungssysteme auch miteinander kombiniert werden.Preferably, the contact pressure control by means of an electromechanical control and in particular by means of a hydraulic control. Alternatively, the contact pressure control can also be effected by means of thermocouples or by means of elements which change their dimension due to heat or cold. Of course, the individual elements and control systems can also be combined with each other.

Gemäß einer weiteren Ausführungsform der erfindungsgemäßen Vorrichtung erfolgt die Druckerfassung mit Hilfe eines piezoelektrischen Systems oder eines mechanischen Dehnmessstreifens vorzugsweise basierend auf elektrischen Messgrößen wie z.B. der Widerstandsänderung einer Wheatstone'schen Brücke oder auf optischen Dehnmessstreifen. Als optischer Dehnmessstreifen können hierunter beispielsweise Systeme basierend auf dem Prinzip der Bragg-Gittern verstanden werden.According to a further embodiment of the device according to the invention, the pressure detection is carried out with the aid of a piezoelectric system or a mechanical strain gauge, preferably based on electrical parameters such as e.g. the change in resistance of a Wheatstone bridge or on optical strain gauges. For example, systems based on the principle of Bragg gratings can be understood as optical strain gauges.

Als Regeln wird gemäß der vorliegenden Erfindung ein Prinzip verstanden, bei welchem eine Regelungsgröße in einem technischen System vorkommende und prinzipiell veränderliche Größen in einem vorgegebenen Bereich versucht wird konstant zu halten. Insbesondere werden mittels der Regelung Störgrößen oder Veränderungen eines im Wesentlichen geschlossenen Systems ausgeglichen.As rules, according to the present invention, 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. In particular, disturbances or changes in a substantially closed system are compensated for by the control.

Als Steuern wird ein Verfahren verstanden, bei welchen im einem offenen System bestimmte Zielwerte vorgeben werden aber insbesondere eine automatische Rückkopplung zur Veränderung der Stellgröße nicht erfolgt. Aus einem offenen Steuerungssystem wird in der Technik häufig durch die Zwischenschaltung von Bedienpersonal eine "Pseudoregelung" verwirklicht.Control is understood as a method in which certain target values are specified in an open system, but in particular an automatic feedback for changing the manipulated variable does not occur. From an open control system, a "pseudo-regulation" is often realized in the art by the interposition of operating personnel.

Zum Reinigen von beispielsweise in Papiermaschinen oder in Druckwerken rotierenden Walzen werden an die Walzen messerartige Schaber angelegt. Die Schaber weisen eine Klinge auf, die dabei mit einer im Berührungsbereich an die Walzenoberfläche angelegten Tangente einen Winkel von üblicherweise zwischen 8° und 40° einschließt. Je nach Beschaffenheit der Oberfläche der Walzen und deren Rotationsgeschwindigkeiten bestehen die Schaber beispielsweise aus Metall, Kunststoff oder Composites bzw. Verbundmaterialien. Der Anpressdruck, wie in diesem Zusammenhang die Anpresskraft pro Längeneinheit des Schabers bezeichnet wird, liegt im Normalfall zwischen 50 und 500 N/m und wird durch das Eigengewicht des Schabers, des Schaberhalters, usw. und/oder durch hydraulische und/oder mechanische Einrichtungen erzeugt. Hierbei erfolgt keine variable Regelung des Anpressdrucks, sondern nur der Versuch der Erzeugung eines homogenen Anpressdrucks mit Hilfe hydraulischer Maßnahmen (Luftdruckschläuche). Die Praxis hat jedoch gezeigt, dass die damit erzielbaren Profile in teilweise hohem Maße von dem angestrebten gleichmäßigen Anpressdruckprofil abweichen. In Figur 1 und 2 sind derartige reale Anpressdruckkurven wiedergegeben. Daraus ist klar zu erkennen, dass eine Möglichkeit fehlt, den örtlich unterschiedlichen Anpressdruck des Schabers nachzuregeln. Derartige Probleme führen zu Schäden im hohen Millionenbereich, da es beim Durchlassen von Papier in Papiermaschinen schnell zu Schäden an der Schaberhalterung, den Schabern selbst, der Bespannung und gegebenenfalls sogar an der Pressrolle und deren Lagerung kommen kann.For cleaning, for example, in paper machines or in printing units rotating rollers 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 roll in the area of contact. Depending on the nature of the surface of the rollers and their rotational speeds, 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 , Here, no variable control of the contact pressure, but only the attempt of generating a homogeneous contact pressure by means of hydraulic measures (air pressure hoses). Practice has shown, however, that the achievable profiles deviate in some high degree from the desired uniform contact pressure profile. In FIGS. 1 and 2 such real contact pressure curves are reproduced. From this it is clear that there is a lack of possibility to adjust the spatially different pressure of the scraper. Such problems lead to damage in the high million range, as it can quickly damage the scraper holder, the scraper itself, the fabric and possibly even on the press roller and their storage when passing paper in paper machines.

Die bis heute einzige Möglichkeit zur Überprüfung des Anpressdrucks der Schaber erfolgt offline, bei stehender Maschine, u.a. mittels Messschabern, die anstelle der reinigenden Schaber eingesetzt werden. Diese Messschaber umfassen beispielsweise Dehnungsmessstreifen, die in vorzugsweise regelmäßigen Abständen über die parallel zur Walzenlänge verlaufende Erstreckung eines Messschabers angeordnet und über Messleitungen mit einer Auswerteeinrichtung verbunden sind. Eine derartige Messschabervorrichtung ist in der EP 1 259 377 B1 beschrieben. Online Möglichkeiten zur Erfassung des Anpressdruckes fehlen bis heute.The only way to check the contact pressure of the scrapers to date is done offline, with the machine at a standstill, using measuring scrapers, for example, which are used instead of the cleaning scrapers. These measuring scrapers comprise, for example, strain gauges which are arranged at preferably regular intervals over the extension of a measuring scraper running parallel to the roller length and are connected to an evaluation device via measuring lines. Such a doctor blade device is in the EP 1 259 377 B1 described. Online options for recording contact pressure are still missing today.

Je nach Art der Anlage variiert der Abnutzungsgrad der eingesetzten Schaber sowohl über die Breite des Schabers, erkennbar als Abnutzungsprofil, als auch absolut pro Einsatzzeit in Abhängigkeit von den Verschleißeigenschaften des Schabermaterials. Die Längen der Walzen und damit auch der Schaber liegen typischerweise zwischen 1 m und 13 m. Um die aufwendigen Messverfahren des Schaberanpressdruckprofils auf ein wirtschaftliches Mindestmaß zu reduzieren, wäre es wünschenswert, den tatsächlichen bzw. absoluten Verschleiß der Schaber pro Zeiteinheit als auch das beim Verschleiß entstehende Profil des Schabers online während der Produktion digital zu erfassen und mit anderen erfassten Daten bzw. Profilen zu vergleichen. Zusätzlich wäre es wünschenswert, das Anpressdruckprofil bei Ungleichmäßigkeiten im Druckprofil örtlich begrenzt nachregeln zu können.Depending on the type of installation, 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. In order to reduce the costly measuring methods of the doctor blade pressure profile to an economic minimum, it would be desirable to digitally record the actual or absolute wear of the scrapers per unit time as well as the resulting profile of the scraper during production online and with other recorded data or Compare profiles. In addition, it would be desirable to be able to readjust the contact pressure profile locally with irregularities in the pressure profile.

Aufgabe der vorliegenden Erfindung ist es, die im Stand der Technik bekannten Probleme zu reduzieren. Besondere Ausführungsformen dienen ferner dazu, eine Vorrichtung bereit zu stellen, welche es ermöglicht, die Profile von Schabern in einer von der Länge des jeweiligen Schabers unabhängigen Weise zu erfassen und vorzugsweise digital zu speichern bzw. aufzubereiten. Die dergestalt erfassten Profile sollen dann durch örtlich variable Veränderung des Anpressdrucks der vom Betreiber gewünschten Form des Anpressdruckprofils angepasst werden können. Es soll u.a. also eine Vorrichtung bereitgestellt werden, die die Erfassung der Werte einfacher und kostengünstiger ermöglicht als die heute hierfür zum Einsatz kommende Technik und zusätzlich die Korrektur eines schlechten Anpressdruckprofils ermöglicht. Die Produktionsausfälle durch Probleme mit Schabern sollen reduziert werden und insbesondere auch die Folgekosten bei Problemen mit ungenügend anpressenden Schabern weitgehend automatisch und auf sichere Weise für den Anwender vermeidbar werden.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. Thus, a device can be provided which allows the detection of the values easier and less expensive than the technology used today for this purpose and additionally allows the correction of a poor contact pressure profile. The production losses due to problems with scrapers should be reduced and, in particular, the follow-up costs for problems with insufficiently pressing scrapers should be largely automatically and safely avoidable for the user.

Die Lösung dieser Aufgaben besteht in einer Vorrichtung mit den im Patentanspruch 1 aufgelisteten Merkmalen. Weiterbildungen sowie vorteilhafte und bevorzugte Ausführungsvarianten der Erfindung sind Gegenstand der abhängigen Patentansprüche.The solution to these problems consists in a device with the features listed in claim 1. Further developments and advantageous and preferred embodiments of the invention are the subject of the dependent claims.

Eine erfindungsgemäße Vorrichtung zum Messen und Regeln eines Schaberprofils umfasst a) eine Schaberhalterung, die den Schaber sicher fest hält und b) mindestens 1 Messvorrichtung zur Erfassung des örtlichen Schaberanpressdrucks und c) eine Vorrichtung, die eine Erhöhung oder Absenkung des Anpressdruckes im Bereich der Messwerterfassung ermöglicht.A device according to the invention for measuring and regulating a doctor profile comprises a) a doctor holder which holds the doctor securely and b) at least one measuring device for detecting the local doctor contact pressure and c) a device which allows an increase or decrease in the contact pressure in the area of the measured value detection ,

Eine bevorzugte Ausführungsform verwendet mehrerer voneinander unabhängig wirkende Messvorrichtungen und Regelvorrichtungen zur örtlich variablen Regelung des Anpressdruckprofils, die insbesondere in Längsrichtung der Schabers angeordnet sind. Vorzugsweise sind die Abstände der Regeleinheiten zwischen 30 mm bis 1000 mm, vorzugsweise 50 mm bis 300 mm, besonders bevorzugt 75 mm bis 200 mm und insbesondere 100 mm bis 150 mm.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. Preferably, 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.

Eine besonders bevorzugte Ausführungsform der Lösung des gestellten Problems ermöglicht die Erfassung des Anpressdrucks mittels Dehnmessstreifen (DMS) oder optischen oder piezoelektrischen Verfahren sowie die Regelung des Anpressdruckes mit Hilfe von elektrisch, thermischen, pneumatisch oder hydraulisch betriebenen Antrieben wie beispielsweise Spindelantrieben.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.

Dabei handelt es sich bei den thermischen betriebenen Antrieben um Systeme, welche ein sich ausdehnendes Heizelement aufweisen, wenn beispielsweise Spannung an das Heizelement angelegt wird. Elektrische bzw. elektromotorische Antriebe arbeiten bevorzugt mit Motoren und können beispielsweise direkt oder mittels einem Bus (Datenübertragung) verbunden werden. Pneumatische Antriebe arbeiten bevorzugt mit Druckluft, mittels welchem direkt oder durch eine Hebelübersetzung die Bewegung bewirkt wird.The thermal powered drives are systems which have an expanding heating element when, for example, voltage is applied to the heating element. 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 preferably work with compressed air, by means of which the movement is effected directly or by a lever transmission.

Hierbei wird beispielsweise der zu regelnde Schaber mittels Rollen oder Führungsschienen in einer festen Lage fixiert. Ein auf der Rückseite oder Vorderseite angebrachter DMS oder ein bzw. mehrere im Bereich der Anpressfinger angebrachte piezoelektrische Sensoren ermöglicht die Erfassung des jeweils lokal anliegenden Schaberanpressdruckes. Die so erhaltenen Daten werden entweder vor Ort oder zentral an anderer Stelle elektronisch verarbeitet. Sollte der erhaltene Anpressdruckwert vom vorgegebenen Sollwert abweichen, wird die im Bereich des Anpressdrucksensors angebrachte Druckregelvorrichtung aktiviert und der Druck bei zu niederem Anpressdruck lokal erhöht oder bei zu hohem Anpressdruck lokal verringert.Here, for example, the scraper to be controlled by means of rollers or guide rails fixed in a fixed position. A mounted on the back or front DMS or one or more attached in the region of the pressure fingers piezoelectric sensors allows the detection of the locally applied scraper contact pressure. The data thus obtained are processed either locally or centrally electronically elsewhere. If the contact pressure value obtained deviate from the specified target value, 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.

Bei Bedarf kann der Schaber auch über motorisch angetriebene Rollen selbsttätig in die Schaberhaltevorrichtung eingezogen und wieder ausgeschoben werden, um die Verletzungsgefahr für das Bedienpersonal zu verringern. Der Anwender muss während der automatisierten Messung und Regelung des Schaberanpressdrucks nicht anwesend sein. Da es zu keinen massiven Einbrüchen des Schaberanpressdrucks kommen kann, sind die heute üblichen Folgekosten und Schäden weitgehend vermeidbar.If necessary, 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. Since there can be no massive collapse of the Schaberanpressdrucks, today's usual follow-up costs and damage are largely avoidable.

In einer weiteren Ausführungsvariante der Erfindung werden an den zu messenden Schaber zur Erhöhung des seitlichen Reibungswiderstandes über die gesamte Länge des Schabers auf beiden Seiten in Höhe der beweglichen seitlichen Führungsrollen und der motorisch angetriebenen Rollen jeweils Streifen aus einem Material mit einem erhöhten Tack (Reibungswiderstand) aufgebracht, um ein Abrutschen auf der glatten Oberfläche des Schabers zu vermeiden. Alternativ kann auch die Fläche des Schabers durch Aufrauen gegen eine zu glatte Oberfläche ausgerüstet werden.In a further embodiment of the invention strips of a material having an increased tack (frictional resistance) are applied to the scraper to be measured for increasing the lateral frictional resistance over the entire length of the scraper on both sides in the amount of the movable lateral guide rollers and the motor-driven rollers to prevent slipping on the smooth surface of the scraper. Alternatively, the surface of the scraper can be equipped by roughening against a too smooth surface.

Als Messmethode zur Bestimmung des Schaber Anpressdruckes und / oder der anschließenden Regelung kann eine elektromechanische Regelung, oder die Druckerfassung mit Hilfe eines mechanischen oder optischen Dehnmessstreifens Verwendung finden.As a measuring method for determining the scraper contact pressure and / or the subsequent control can be an electromechanical control, or find the pressure detection using a mechanical or optical strain gauge.

Eine weitere Ausführungsvariante der Erfindung sieht vor, dass die Erfassung des Anpressdruckprofilsprofils mit Hilfe optischer Erfassungsmethoden erfolgt, wie beispielsweise durch Einsatz von Sensoren basierend auf Bragg-Gittern oder andere optischen Dehnmessstreifen.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.

Gemäß der vorliegenden Erfindung werden unter Abschnitten des Schabers nicht nur wenigstens teilweise mechanisch getrennte Abschnitte verstanden, sondern diese ergeben sich auch durch die Zuordnung eines einstückigen Schabers zu dem jeweiligen Anpresselement und der hieraus sich ergebenden Veränderungsmöglichkeit des Anpressdrucks in einem bestimmten Abschnitt des Schabers.According to the present invention, portions 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 and the resulting possibility of change of the contact pressure in a particular section of the scraper.

Die Erfassung der Messdaten kann mit Hilfe eines gängigen Datenerfassungsprogramms erfolgen wie beispielsweise Lab View® oder auch mit anderen Programmen auf Basis von C++ oder Java oder Python, um nur einige exemplarisch zu nennen.The acquisition of measurement data can be done using a common data collection program such as Lab View® or other programs based on C ++ or Java or Python, just to name a few.

Fig. 1 und 2 zeigen ein gutes und ein schlechtes Schaberanpressdruckprofil aus einer Papiermaschine. Fig. 1 and 2 show a good and a poor scraper pressure profile from a paper machine.

In Figur 1 ist ein gutes Schaberanpressdruckprofil bei variablen Anpressdrücken gezeigt. Die oberste Linie (u.a. am Punkt 18) entspricht dem bei der Produktion vom Hersteller des Schaberhalters vorgeschlagenen Anpressdruck von 2,5 bar. Die unterste Linie ist die Resultierende bei einem Anpressdruck von 1,0 bar.In FIG. 1 is a good Schaberanpressdruckprofil shown 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.

In Figur 2 ist ein schlechtes Schaberanpressdruckprofil bei variablen Anpressdrücken gezeigt. Die mittlere Linie (an Punkt 15 die zweite Linie von oben) entspricht dem bei der Produktion vom Hersteller des Schaberhalters vorgeschlagenen Anpressdruck.In FIG. 2 is a poor Schaberanpressdruckprofil shown 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.

Claims (8)

  1. An apparatus for pressure-zone regulated cleaning of a surface with a scraper, a pressure-exerting device and a detection device,
    wherein the pressure-exerting device includes multiple portions which can each be pressed on the surface largely locally independently of each other,
    and wherein the detection device detects the respective actual contact pressure of the scraper on the surface, characterized in that
    the respective contact pressure of the portions of the pressure-exerting device is regulated based on the respective actual contact pressure on the surface so as to generate a predetermined contact pressure curve over a length of the scraper.
  2. The apparatus according to claim 1, characterized in that the scraper includes over its length a plurality of sections which can each be pressed on by means of a portion of the pressure-exerting device.
  3. The apparatus according to claim 1 or claim 2, characterized in that the contact pressure is locally regulated variably and/or, in particular, the apparatus includes a plurality of pressure-exerting devices which are distributed over the length of the scraper.
  4. A method for regulating the contact pressure of a scraper on a surface using an apparatus according to any of claims 1 to 3, the method comprising the steps of
    - detecting the actual contact pressure in predetermined sections over the length of the scraper;
    - comparing the actual value of the contact pressure in the individual sections of the scraper to a set value;
    - adjusting the actual contact pressure in the individual sections to the set value.
  5. The method of claim 4, characterized in that the contact pressure is regulated using electromechanical, pneumatic and/or thermal regulation.
  6. The method of any of claims 4 or 5, characterized in that the contact pressure is regulated using hydraulic regulation.
  7. The method of any of claims 4 to 6, characterized in that the actual pressure is detected using a piezoelectric system.
  8. The method of any of claims 4 to 7, characterized in that the pressure is detected using a mechanical or optical strain gauge.
EP12717221.1A 2011-03-29 2012-03-28 Pressure-zone regulation for a scraper Active EP2691571B1 (en)

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

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EP2691571A1 EP2691571A1 (en) 2014-02-05
EP2691571B1 true EP2691571B1 (en) 2017-06-28

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WO (1) WO2012130910A1 (en)

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* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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* Cited by examiner, † Cited by third party
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EP2691571A1 (en) 2014-02-05

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