EP1484443A1 - Device and method for controlling the tension force of a moving web - Google Patents

Device and method for controlling the tension force of a moving web Download PDF

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Publication number
EP1484443A1
EP1484443A1 EP04012854A EP04012854A EP1484443A1 EP 1484443 A1 EP1484443 A1 EP 1484443A1 EP 04012854 A EP04012854 A EP 04012854A EP 04012854 A EP04012854 A EP 04012854A EP 1484443 A1 EP1484443 A1 EP 1484443A1
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EP
European Patent Office
Prior art keywords
force
roller
tension
measuring roller
force measuring
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EP04012854A
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German (de)
French (fr)
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EP1484443B1 (en
Inventor
Jörg Väth
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Erhardt and Leimer GmbH
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Erhardt and Leimer GmbH
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Priority to PL04012854T priority Critical patent/PL1484443T3/en
Publication of EP1484443A1 publication Critical patent/EP1484443A1/en
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Publication of EP1484443B1 publication Critical patent/EP1484443B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/005—Wire-tensioning devices

Definitions

  • the invention relates to a device for regulating the Tension of a moving web according to the preamble of Patent claim 1 and a method according to the preamble of claim 8.
  • circulating sieve belts for drainage known from paper webs. This is the paper web pressed against the wire to remove water from the paper web push out.
  • the circulating band is here as an endless belt trained and runs at the same speed like the paper web around.
  • the Force measuring roller has at both opposite Store each a force sensor, the Bearing force measures.
  • the tensioning roller is controlled by a Actuator adjusted to the circulating band more or less tension.
  • the force sensors are via a control device with the tension control roller in operative connection.
  • the invention is based on the object, a device and a method for controlling the tension of a to create a running track, which at low wrap the force measuring a precise control of the Belt tension allowed.
  • the device according to claim 1 is used to control the Tension of a moving web, in particular a circumferential Bandes, in particular to a felt or Sieve belt of a pulp or papermaking machine or a coating machine is intended. It is advantageous if the circulating band of as little as possible Rolling is deflected, this being the circulating band if possible, capture only from the non-paper-touched page should. However, this can only be done if the orbiting band of each individual roll is less is deflected as 180 °. For a smooth Operation, it is also necessary, the clamping force of the rotating To keep the band constant, Clamping control device takes place.
  • the thereby determined Bearing force is a measure of the belt tension.
  • the Control device acts on an actuator of an adjustable Tension control roller, this according to the output signal of the control device controls. This results in the problem that is due to the adjustment the tension control roller an altered wrap the force measuring roller results. In these conditions the bearing force does not give a clear value for the band tension, so that the circulating band depending on Position of the tensioning roller to different Band tensions is regulated.
  • the force sensor is assigned a correction device, which takes into account the wrap of the force measuring roller.
  • This correction device calculates from the bearing force and the wrapping of the force measuring roller, the belt tensile force and forwards them to the control device as an actual value further. In this way it is ensured that the control device regardless of the position of the tension control roller and thus independent of the resulting Looping of the circulating belt, the belt tension regulated to a constant value. This ensures in all operating conditions a consistent production quality. In particular, it does not matter if that Band is incorrectly distracted, especially as the resulting Value of the wrap of the force measuring roller in the determination the tensile strength is taken into account.
  • a particularly simple realization of the correction device results from claim 2.
  • the correction device from the position of the tensioning roller and thus of the respective position of the actuator affected.
  • This location can be directly from a travel sensor be detected, for example, with a drive shaft the actuator is connected.
  • the encoder determines doing the distance traveled by the actuator, so that the respective position of the tension control roller in each Operating state is known.
  • an incremental Position sensing is preferably at least the actuator a limit switch associated with a zero point adjustment the route detection ensures.
  • the wrap can the Kraftmeßwalze directly from the layers the axes of three rolls are calculated, with a these rollers is adjustable by the actuator.
  • a simple realization of the correction device results from claim 4.
  • the correction device associated with a storage device in which the layers the fixed rollers are stored. It's enough completely to save the layers of those rolls, which the Kraftmeßwalze are adjacent, since the remaining Rolling no influence on the wrap of Kraftmeßwalze to have. From the known positions of the Kraftmeßwalze adjacent rollers and the load cell itself can the wrap of Kraftmeßwalze and thus the required Correction factor for calculating the strip tension voltage can be easily determined.
  • the correction device of at least two force sensors of the force measuring roller is affected.
  • These Force sensors work in different directions, so that the bearing force of the force measuring roller of these vectorial is detected. From this vectorial bearing force In addition to the amount of the bearing force, its direction are determined from the wrap of the force measuring roller can be determined. In particular, it is there not necessary, the exact locations of the adjacent To know rolls so that constructive changes in the roll structure without affecting the measurement result.
  • all rollers have the same band side, preferably the strip side not touched by the paper web to capture. This will prevent particles from spreading from the paper web, accumulate on the screen belt and on renewed transfer to the paper web to a no longer tolerable defect.
  • a running Web in particular a circulating belt of rollers deflected.
  • At least one of the rollers is as Kraftmeßwalze trained, whose bearing force is measured.
  • At least one of the rollers, preferably the force measuring roller is as Tensioning roller formed by an actuator is adjusted.
  • the adjustment of the tensioning roller takes place by regulating the tape tension of the circulating band.
  • the force measuring roller at a Adjustment of the actuator different from the circulating Band entwined, so that the tape tension is not is more proportional to the measured bearing force. Nevertheless a proper draft control for the circulating
  • the band is obtained from the measured bearing force taking into account the respective wrap the force measuring roller calculates the belt tension. This results a proper tension control in each Position of the tensioning roller.
  • the position of the Tape from a sensor to capture.
  • This sensor will preferably formed by a roller, which is resilient against the circulating band is pressed. From the location of Roller can directly wrap the force measuring roller be determined.
  • a non-contact sensor for example an ultrasonic sensor, insert, which detects the position of the tape.
  • the force measuring roller is associated with a winder. That from the Kraftmeßwalze outgoing strand of the web is doing directly supplied to the winder, so that its angular position according to the diameter of the coil changes accordingly. The resulting change in the wrap the load roller is corrected so that the web force can be determined with sufficient accuracy. As between the Kraftmeßwalze and the winder no further rolls are provided, can be in this way the web tension in the area of the winder with particularly high accuracy determine and correct by the web tension control.
  • FIG. 1 shows a schematic representation of a first one Embodiment of a device 1 for controlling the Clamping force of a circulating belt 2.
  • the belt 2 is in this embodiment of a wire of a dewatering device 3 of a papermaking machine educated.
  • the dewatering device 3 has a rotatable Drum 4, which looped by a wet paper web 5 becomes.
  • the band 2 is against the paper web 5, so that the paper web 5 between the Sieve 2 and the drum 4 is held.
  • the volume 2 stands under a given tension to the desired drainage effect for the paper web 5 too achieve. In this case, that is contained in the paper web 5 excess water due to the pressure of the sieve belt 2 squeezed through this.
  • To achieve a sufficient Drainage effect are several drainage devices 3 arranged one behind the other.
  • the band 2 is deflected by four rollers 6, 7, 8, 9. there the rollers 6, 9 are fixed in their axial position trained and therefore serve as pure guide rollers 6, 9th
  • the roller 7 is pivotally mounted in the direction of arrow 10 and forms a stripline roller. By pivoting the stripline roller 7, the band 2 in his Direction be affected. This is important to that To keep Volume 2 in place.
  • an edge sensor 11 provided, which detects the position of the belt 2 and a Bandlaufregler 12 supplies. This tape controller compares the output from the edge sensor 11 signal with a Setpoint and controls accordingly a not shown Actuator of the strip roller 7. On In this way, a stripline control is achieved.
  • the tensioning roller 8 at the same time as Kraftmeßwalze 15 trained.
  • the force measuring roller 15th equipped at both camps with force sensors 16, the measure the bearing force. Determine these force sensors 16 the bearing force of the force measuring roller 15 in two to each other vertical directions, so that in addition to the amount the bearing force and their direction can be determined.
  • the force sensors 16 are in operative connection with a correction device 17, which calculates the tape tensile force from the measured vectorial bearing force F.
  • the amount of the determined bearing force F and ⁇ is the angle between the measured force direction and the tape running direction between the rollers 7 and 8.
  • the correction device 17 is in operative connection with a displacement sensor 18, which detects the respective position of the actuator 13.
  • the displacement sensor 18 is in operative connection with a drive shaft 19 of the actuator 13.
  • the correction device 17 receives a signal representing the position of the tension control roller 8.
  • the correction device 17 is associated with a storage device 20 in which the positions of the rollers 7 and 9 are stored.
  • H here means the height difference between the rolls 8 and 9 in vertical projection on the band plane between the rollers 7 and 8 and x the respective position of Clamping roller 8, based on the position of the guide roller 9.
  • a sensor 24 is provided, the to the force measuring roller 15 tapered strand of the circulating Bandes recorded. Basically, that could also be from the force measuring roller 15 running strand of the circulating belt 2 are detected by another sensor 24, this However, in the embodiment is not required because the location of this run regardless of the position of Clamping roller 8 is.
  • the sensor 24 has a pivotally supported free rotatable roller 25, the resilient against the circumferential Volume 2 is pressed.
  • the sensor 24 also has a Potentiometer 26 on which the pivoting position of the roller 25 detected and converted into an electrical signal. This electrical signal is for wrapping the force measuring roller 15 proportional and becomes the correction device 17 supplied.
  • the correction device 17 is connected to a control device 21 in operative connection, which by the correction device 17 determined band tension as the actual value receives and with a desired value of a setpoint generator 22 compares.
  • the control device 21 preferably has a PID behavior and acts with its output 23 on the Actuator 13 a. This can be done by adjusting the of Setpoint generator 22 output desired value Bandzugschreib be adjusted, which then by the control device 21 by adjusting the tension control roller 8 is corrected.
  • FIG. 2 shows a schematic representation of a second embodiment of the device 1 according to FIG. 1, wherein like reference numerals designate like parts. in the following are only the differences from the embodiment explained according to FIG.
  • the device 1 according to FIG. 2 serves to capture and regulate the elasticity of a running Lane 2, which is deflected over rollers 6, 15 and up a winder 27 is wound up. In reverse web direction could the winder 27 as an unwinder be used.
  • the roller 15 is designed as a force measuring roller whose bearing forces detected vectorially by means of the force sensor 16 become.
  • the force measuring roller 15 is in the direction of arrow 14 by means of the actuator 13 adjustable to the desired Adjust tension of the web 2.
  • the wrap angle ⁇ of the force measuring roller 15 is on the one hand by the situation the force measuring roller 15 and on the other hand by the diameter of the winder 27 determined. This diameter changes depending on the progress of the winding or unwinding process. Due to the vectorial recording of the bearing force of the Force measuring roller 15 can still sufficient the web tension be determined exactly.

Landscapes

  • Paper (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Drives For Endless Conveyors (AREA)

Abstract

A paper-making machine has a de-watering belt (2) whose tension is maintained esp. by a force-measuring sensor (16) with a force-correction unit (17). The sensor detects the force (F) exerted on a drum (8) bearing by the belt. The force-correction unit (17) signals a correction value to a regulator (21) which rectifies the drum (8) position (x). The force-correction unit (17) is directly influenced by the relative position of the tension regulator drum (8) and the neighbouring drums (7, 9). the force-correction unit (17) is associated with a memory device (20) which registers the position of the neighbouring drums (7, 9). The belt tension regulation drums (8) and tension measuring drum (15) are one and the same. All drums (6, 7, 8, 9, 15) are in contact with the same side of the belt.

Description

Die Erfindung betrifft eine Vorrichtung zum Regeln der Spannkraft einer laufenden Bahn gemäß dem Oberbegriff des Patentanspruchs 1 sowie ein Verfahren gemäß dem Oberbegriff des Patentanspruchs 8.The invention relates to a device for regulating the Tension of a moving web according to the preamble of Patent claim 1 and a method according to the preamble of claim 8.

Aus der Praxis sind umlaufende Siebbänder zur Entwässerung von Papierbahnen bekannt. Dabei wird die Papierbahn gegen das Siebband gedrückt, um Wasser aus der Papierbahn herauszudrücken. Das umlaufende Band ist dabei als Endlosband ausgebildet und läuft mit der gleichen Geschwindigkeit wie die Papierbahn um. Zur Erzielung eines reibungslosen Entwässerungsvorgangs ist es wichtig, daß das umlaufende Band innerhalb gewisser Toleranzen mit einer vorgegebenen Zugspannung beaufschlagt wird. Dies wird durch Regeln der Bandzugkraft bewirkt, wobei eine der Walzen als Kraftmeßwalze zur Bestimmung der Bandzugkraft und eine als Spannkraftregelwalze ausgebildet ist. Die Kraftmeßwalze weist dabei an beiden einander gegenüberliegenden Lagern jeweils einen Kraftsensor auf, der die Lagerkraft mißt. Die Spannkraftregelwalze wird von einem Stellmotor verstellt, um das umlaufende Band mehr oder weniger zu spannen. Zur Erzielung eines geschlossenen Regelkreises stehen die Kraftsensoren über eine Regeleinrichtung mit der Spannkraftregelwalze in Wirkverbindung. Um aus der gemessenen Lagerkraft direkt die Bandzugkraft ermitteln zu können, wird das umlaufende Band an der Kraftmeßwalze um 180° umgelenkt. Dabei wird die Kraftmeßwalze unabhängig von der Lage des Stellantriebs in stets gleicher Weise umschlungen, so daß die gemessene Lagerkraft direkt die Bandzugkraft wiedergibt. Aufgrund der großen Umschlingung der Kraftmeßwalze ist es erforderlich, das Band sowohl innen- als auch außenseitig von Walzen zu erfassen. Damit wird auch die papierberührte Seite des umlaufenden Bandes von Walzen erfaßt, so daß sich an diesen Walzen Partikel aus der Papierbahn kumulieren können. Diese Partikel führen zu Defekten in der Papierbahn und sind daher unerwünscht.In practice, circulating sieve belts for drainage known from paper webs. This is the paper web pressed against the wire to remove water from the paper web push out. The circulating band is here as an endless belt trained and runs at the same speed like the paper web around. To achieve a smooth Drainage process, it is important that the circulating band within certain tolerances with a predetermined tensile stress is applied. this will by controlling the band tension, wherein one of the Rolls as a force measuring roller for determining the belt tension and one is designed as a tension control roller. The Force measuring roller has at both opposite Store each a force sensor, the Bearing force measures. The tensioning roller is controlled by a Actuator adjusted to the circulating band more or less tension. To achieve a closed loop the force sensors are via a control device with the tension control roller in operative connection. To change the tensile force directly from the measured bearing force to determine the circulating band at the Force measuring roller deflected by 180 °. This is the force measuring roller regardless of the position of the actuator in always wrapped in the same way, so that the measured bearing force directly reflects the tape tension. Due to the large wrap around the force measuring roll, it is necessary the band both inside and outside of To detect rolls. This will also affect the paper Side of the circulating belt of rollers detected so that Particles accumulate on these rolls from the paper web can. These particles lead to defects in the Paper web and are therefore undesirable.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung und ein Verfahren zum Regeln der Spannkraft einer laufenden Bahn zu schaffen, welches bei geringer Umschlingung der Kraftmeßwalze eine präzise Regelung der Bandzugkraft erlaubt.The invention is based on the object, a device and a method for controlling the tension of a to create a running track, which at low wrap the force measuring a precise control of the Belt tension allowed.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen der Patentansprüche 1 bzw. 8 gelöst. This object is achieved with the features of Claims 1 and 8, respectively.

Die Vorrichtung gemäß Anspruch 1 dient zum Regeln der Spannkraft einer laufenden Bahn, insbesondere eines umlaufenden Bandes, wobei insbesondere an ein Filz- oder Siebband einer Zellstoff- oder Papierherstellungsmaschine bzw. eine Streichmaschine gedacht ist. Dabei ist es vorteilhaft, wenn das umlaufende Band von möglichst wenig Walzen umgelenkt wird, wobei diese das umlaufende Band möglichst nur von der nicht papierberührten Seite erfassen sollen. Dies läßt sich jedoch nur bewerkstelligen, wenn das umlaufende Band von jeder einzelnen Walze um weniger als 180° umgelenkt wird. Für einen reibungslosen Betrieb ist es zudem erforderlich, die Spannkraft des umlaufenden Bandes konstant zu halten, was durch eine Spannkraft-Regeleinrichtung erfolgt. Diese wird von mindestens einem Kraftsensor einer Kraftmeßwalze beeinflußt, an der das umlaufende Band umgelenkt ist. Die dabei ermittelte Lagerkraft ist ein Maß für die Bandzugkraft. Die Regeleinrichtung wirkt auf einen Stellantrieb einer verstellbaren Spannkraftregelwalze ein, die diese entsprechend dem Ausgangssignal der Regeleinrichtung ansteuert. Dabei ergibt sich das Problem, daß sich durch die Verstellung der Spannkraftregelwalze eine veränderte Umschlingung der Kraftmeßwalze ergibt. Unter diesen Bedingungen ergibt die Lagerkraft keinen eindeutigen Wert für die Bandspannung, so daß das umlaufende Band je nach Stellung der Spannkraftregelwalze auf unterschiedliche Bandspannungen geregelt wird. Zur Lösung dieses Problems ist dem Kraftsensor eine Korrekturvorrichtung zugeordnet, welche die Umschlingung der Kraftmeßwalze berücksichtigt. Diese Korrekturvorrichtung errechnet aus der Lagerkraft und der Umschlingung der Kraftmeßwalze die Bandzugkraft und leitet diese an die Regeleinrichtung als Ist-Wert weiter. Auf diese Weise ist gewährleistet, daß die Regeleinrichtung unabhängig von der Stellung der Spannkraftregelwalze und damit unabhängig von der daraus resultierenden Umschlingung des umlaufenden Bandes die Bandspannung auf einen konstanten Wert regelt. Dies gewährleistet in allen Betriebszuständen eine gleichbleibende Produktionsqualität. Insbesondere spielt es keine Rolle, wenn das Band unkorrekt abgelenkt ist, zumal der sich daraus ergebende Wert der Umschlingung der Kraftmeßwalze bei der Ermittlung der Bandzugkraft berücksichtigt wird.The device according to claim 1 is used to control the Tension of a moving web, in particular a circumferential Bandes, in particular to a felt or Sieve belt of a pulp or papermaking machine or a coating machine is intended. It is advantageous if the circulating band of as little as possible Rolling is deflected, this being the circulating band if possible, capture only from the non-paper-touched page should. However, this can only be done if the orbiting band of each individual roll is less is deflected as 180 °. For a smooth Operation, it is also necessary, the clamping force of the rotating To keep the band constant, Clamping control device takes place. This will be from at least a force sensor of a Kraftmeßwalze affected, at which the circulating band is deflected. The thereby determined Bearing force is a measure of the belt tension. The Control device acts on an actuator of an adjustable Tension control roller, this according to the output signal of the control device controls. This results in the problem that is due to the adjustment the tension control roller an altered wrap the force measuring roller results. In these conditions the bearing force does not give a clear value for the band tension, so that the circulating band depending on Position of the tensioning roller to different Band tensions is regulated. To solve this problem the force sensor is assigned a correction device, which takes into account the wrap of the force measuring roller. This correction device calculates from the bearing force and the wrapping of the force measuring roller, the belt tensile force and forwards them to the control device as an actual value further. In this way it is ensured that the control device regardless of the position of the tension control roller and thus independent of the resulting Looping of the circulating belt, the belt tension regulated to a constant value. This ensures in all operating conditions a consistent production quality. In particular, it does not matter if that Band is incorrectly distracted, especially as the resulting Value of the wrap of the force measuring roller in the determination the tensile strength is taken into account.

Eine besonders einfache Realisierung der Korrekturvorrichtung ergibt sich aus Anspruch 2. Dabei ist die Korrekturvorrichtung von der Lage der Spannkraftregelwalze und damit von der jeweiligen Stellung des Stellantriebs beeinflußt. Diese Lage kann unmittelbar von einem Weggeber erfaßt werden, der beispielsweise mit einer Antriebswelle des Stellantriebs verbunden ist. Der Weggeber ermittelt dabei den zurückgelegten Weg des Stellantriebs, so daß die jeweilige Lage der Spannkraftregelwalze in jedem Betriebszustand bekannt ist. Im Falle einer incrementalen Wegerfassung ist vorzugsweise dem Stellantrieb mindestens ein Endschalter zugeordnet, der eine Nullpunkteinstellung der Wegerfassung sicherstellt.A particularly simple realization of the correction device results from claim 2. Here is the correction device from the position of the tensioning roller and thus of the respective position of the actuator affected. This location can be directly from a travel sensor be detected, for example, with a drive shaft the actuator is connected. The encoder determines doing the distance traveled by the actuator, so that the respective position of the tension control roller in each Operating state is known. In the case of an incremental Position sensing is preferably at least the actuator a limit switch associated with a zero point adjustment the route detection ensures.

Zur weiteren Verbesserung der Korrekturvorrichtung ist es gemäß Anspruch 3 günstig, wenn die Korrekturvorrichtung von der relativen Lage der Kraftmeßwalze zu den benachbarten Walzen beeinflußt ist. In diesem Fall kann die Umschlingung der Kraftmeßwalze unmittelbar aus den Lagen der Achsen dreier Walzen berechnet werden, wobei eine dieser Walzen durch den Stellantrieb verstellbar ist.To further improve the correction device it is according to claim 3 favorable when the correction device from the relative position of the force measuring roller to the adjacent ones Rolling is affected. In this case, the wrap can the Kraftmeßwalze directly from the layers the axes of three rolls are calculated, with a these rollers is adjustable by the actuator.

Eine einfache Realisierung der Korrekturvorrichtung ergibt sich aus Anspruch 4. Dabei ist der Korrekturvorrichtung eine Speichervorrichtung zugeordnet, in der die Lagen der feststehenden Walzen abgelegt sind. Es reicht dabei völlig aus, die Lagen jener Walzen zu speichern, welche der Kraftmeßwalze benachbart sind, da die übrigen Walzen keinerlei Einfluß auf die Umschlingung der Kraftmeßwalze haben. Aus den bekannten Lagen der der Kraftmeßwalze benachbarten Walzen sowie der Kraftmeßwalze selbst kann die Umschlingung der Kraftmeßwalze und damit der erforderliche Korrekturfaktor zur Berechnung der Bandzug spannung leicht ermittelt werden.A simple realization of the correction device results from claim 4. Here is the correction device associated with a storage device in which the layers the fixed rollers are stored. It's enough completely to save the layers of those rolls, which the Kraftmeßwalze are adjacent, since the remaining Rolling no influence on the wrap of Kraftmeßwalze to have. From the known positions of the Kraftmeßwalze adjacent rollers and the load cell itself can the wrap of Kraftmeßwalze and thus the required Correction factor for calculating the strip tension voltage can be easily determined.

Alternativ oder zusätzlich ist es gemäß Anspruch 5 vorteilhaft, wenn die Korrekturvorrichtung von mindestens zwei Kraftsensoren der Kraftmeßwalze beeinflußt ist. Diese Kraftsensoren wirken in unterschiedliche Richtungen, so daß die Lagerkraft der Kraftmeßwalze von diesen vektoriell erfaßt wird. Aus dieser vektoriellen Lagerkraft kann neben dem Betrag der Lagerkraft auch deren Richtung ermittelt werden, aus der die Umschlingung der Kraftmeßwalze bestimmt werden kann. Insbesondere ist es dabei nicht erforderlich, die genauen Lagen der benachbarten Walzen zu kennen, so daß konstruktive Änderungen des Walzenaufbaus ohne Auswirkung auf das Meßergebnis bleiben.Alternatively or additionally, it is advantageous according to claim 5, if the correction device of at least two force sensors of the force measuring roller is affected. These Force sensors work in different directions, so that the bearing force of the force measuring roller of these vectorial is detected. From this vectorial bearing force In addition to the amount of the bearing force, its direction are determined from the wrap of the force measuring roller can be determined. In particular, it is there not necessary, the exact locations of the adjacent To know rolls so that constructive changes in the roll structure without affecting the measurement result.

Zur Erzielung eines einfachen, kostengünstigen und störarmen Aufbaus ist es wichtig, möglichst wenig Umlenkwalzen für das umlaufende Band einzusetzen. Neben zwei das Siebband gegen die Papierbahn drückenden Walzen ist grundsätzlich eine verschwenkbare Bahnlaufregelwalze vorgesehen, mit deren Hilfe das umlaufende Band geführt wird. Um mit einer möglichst geringen Zahl von Walzen auszukommen, ist es gemäß Anspruch 6 vorteilhaft, wenn die Spannkraftregelwalze und die Kraftmeßwalze von derselben Walze gebildet sind. Damit wird die Kraftmeßwalze durch den Stellantrieb verstellt, was zu einer relativ großen Veränderung der Umschlingung durch das umlaufende Band führt. Diese sich ändernde Umschlingung wird jedoch von der Korrekturvorrichtung ausreichend berücksichtigt, um eine zuverlässige Spannkraftregelung zu erzielen.To achieve a simple, inexpensive and low-noise In construction, it is important to have as few deflection rollers as possible for the circulating band. Besides two that Sieve belt against the paper web is pressing rollers basically provided a pivotable web guide roller, with whose help the circulating band led becomes. To use as few rolls as possible to get along, it is advantageous according to claim 6, when the tensioning roller and the force measuring roller of the same Roller are formed. This will be the force measuring roller adjusted by the actuator, resulting in a relative big change of wrap around the orbiting Band leads. However, this changing loop becomes sufficiently taken into account by the correction device, to achieve a reliable clamping force control.

Um einen möglichst störarmen Betrieb der Papierherstellungsmaschine zu gewährleisten, ist es gemäß Anspruch 7 vorteilhaft, wenn alle Walzen dieselbe Bandseite, vorzugsweise die nicht von der Papierbahn berührte Bandseite erfassen. Damit wird verhindert, daß Partikel, die sich von der Papierbahn lösen, auf dem Siebband ansammeln und bei erneuter Übertragung auf die Papierbahn zu einem nicht mehr tolerierbaren Defekt führen.In order to minimize interference with the operation of the papermaking machine to ensure it is according to claim 7 advantageous if all rollers have the same band side, preferably the strip side not touched by the paper web to capture. This will prevent particles from spreading from the paper web, accumulate on the screen belt and on renewed transfer to the paper web to a no longer tolerable defect.

Bei dem Verfahren gemäß Anspruch 8 wird eine laufende Bahn, insbesondere ein umlaufendes Band von Walzen umgelenkt. Mindestens eine der Walzen ist als Kraftmeßwalze ausgebildet, deren Lagerkraft gemessen wird. Mindestens eine der Walzen, vorzugsweise die Kraftmeßwalze, ist als Spannkraftregelwalze ausgebildet, die von einem Stellantrieb verstellt wird. Die Verstellung der Spannkraftregelwalze erfolgt dabei durch Regeln der Bandzugkraft des umlaufenden Bandes. Um möglichst wenige Walzen einsetzen zu müssen, die vorzugsweise nur eine Seite des umlaufenden Bandes erfassen, wird die Kraftmeßwalze bei einer Verstellung des Stellantriebs unterschiedlich vom umlaufenden Band umschlungen, so daß die Bandzugkraft nicht mehr proportional zur gemessenen Lagerkraft ist. Um dennoch eine ordnungsgemäße Zugkraftregelung für das umlaufende Band zu erzielen, wird aus der gemessenen Lagerkraft unter Berücksichtigung der jeweiligen Umschlingung der Kraftmeßwalze die Bandzugkraft berechnet. Damit ergibt sich eine ordnungsgemäße Bandzugkraftregelung in jeder Stellung der Spannkraftregelwalze.In the method according to claim 8 is a running Web, in particular a circulating belt of rollers deflected. At least one of the rollers is as Kraftmeßwalze trained, whose bearing force is measured. At least one of the rollers, preferably the force measuring roller, is as Tensioning roller formed by an actuator is adjusted. The adjustment of the tensioning roller takes place by regulating the tape tension of the circulating band. To use as few rolls as possible to have, preferably only one side of the circulating Grasp tape, the force measuring roller at a Adjustment of the actuator different from the circulating Band entwined, so that the tape tension is not is more proportional to the measured bearing force. Nevertheless a proper draft control for the circulating The band is obtained from the measured bearing force taking into account the respective wrap the force measuring roller calculates the belt tension. This results a proper tension control in each Position of the tensioning roller.

Zur Erzielung eines möglichst geringen Datenverarbeitungsaufwands ist es gemäß Anspruch 9 günstig, wenn die Bandzugkraft aus der gemessenen Lagerkraft der Kraftmeßwalze und einem Korrekturfaktor berechnet wird. Dieser Korrekturfaktor berücksichtigt dabei die Positionen der einzelnen Walzen sowie die sich verändernde Lage der Spannkraftregelwalze. Aus diesen Positionen kann die Umschlingung der Kraftmeßwalze unmittelbar ermittelt werden.To achieve the lowest possible data processing effort it is favorable according to claim 9, when the Band tensile force from the measured bearing force of the force measuring roller and a correction factor is calculated. This Correction factor takes into account the positions of the individual rollers as well as the changing position of the Tension regulating roller. From these positions, the wrap can the Kraftmeßwalze be determined immediately.

Alternativ oder zusätzlich ist es gemäß Anspruch 10 günstig, die Lagerkraft der Kraftmeßwalze vektoriell zu ermitteln. Dabei wird aus der Richtung der Lagerkraft die Umschlingung der Kraftmeßwalze durch das Band berechnet, um den Korrekturfaktor für die Bandzugkraft zu ermitteln. Auf diese Weise ergibt sich eine von der Bandgeometrie im wesentlichen unabhängige Berechnung der Bandzugkraft. Alternatively or additionally, it is advantageous according to claim 10, vectorially determine the bearing force of the force measuring roller. It is from the direction of the bearing force the Looping of the load roll calculated by the band, to determine the correction factor for the strip tensile force. This results in one of the band geometry in the essentially independent calculation of the belt tension.

Außerdem ist es gemäß Anspruch 11 vorteilhaft, zur Bestimmung der Umschlingung der Kraftmeßwalze die Lage des Bandes von einem Sensor zu erfassen. Dieser Sensor wird vorzugsweise von einer Rolle gebildet, welche federnd gegen das umlaufende Band gedrückt wird. Aus der Lage der Rolle kann unmittelbar die Umschlingung der Kraftmeßwalze ermittelt werden. Alternativ ist auch daran gedacht, einen berührungslosen Sensor, beispielsweise einen Ultraschallsensor, einzusetzen, der die Lage des Bandes erfaßt.Moreover, it is advantageous according to claim 11, for the determination the wrap of the force measuring roller the position of the Tape from a sensor to capture. This sensor will preferably formed by a roller, which is resilient against the circulating band is pressed. From the location of Roller can directly wrap the force measuring roller be determined. Alternatively, it is also thought, a non-contact sensor, for example an ultrasonic sensor, insert, which detects the position of the tape.

Schließlich ist es gemäß Anspruch 12 vorteilhaft, wenn die Kraftmeßwalze einem Wickler zugeordnet ist. Das von der Kraftmeßwalze abgehende Trum der Bahn wird dabei unmittelbar dem Wickler zugeführt, so daß sich dessen Winkellage je nach Durchmesser des Wickels entsprechend ändert. Die daraus resultierende Änderung der Umschlingung der Kraftmeßwalze wird dabei korrigiert, so daß die Bahnkraft ausreichend exakt ermittelbar ist. Da zwischen der Kraftmeßwalze und dem Wickler keinerlei weitere Walzen vorgesehen sind, läßt sich auf diese Weise die Bahnzugkraft im Bereich des Wicklers mit besonders hoher Genauigkeit ermitteln und durch die Bahnspannungsregelung korrigieren.Finally, it is advantageous according to claim 12, when the force measuring roller is associated with a winder. That from the Kraftmeßwalze outgoing strand of the web is doing directly supplied to the winder, so that its angular position according to the diameter of the coil changes accordingly. The resulting change in the wrap the load roller is corrected so that the web force can be determined with sufficient accuracy. As between the Kraftmeßwalze and the winder no further rolls are provided, can be in this way the web tension in the area of the winder with particularly high accuracy determine and correct by the web tension control.

Der Erfindungsgegenstand wird beispielhaft anhand der Zeichnung erläutert, ohne den Schutzumfang zu beschränken. The subject invention is exemplified by the Drawing explained without limiting the scope.

Es zeigt:

Figur 1
eine schematische Darstellung einer ersten Ausführungsform einer Vorrichtung zum Regeln der Spannkraft eines Bandes und
Figur 2
eine schematische Darstellung einer zweiten Ausführungsform einer Vorrichtung zum Regeln einer Bahn.
It shows:
FIG. 1
a schematic representation of a first embodiment of a device for controlling the tension of a belt and
FIG. 2
a schematic representation of a second embodiment of a device for controlling a web.

Die Figur 1 zeigt eine schematische Darstellung einer ersten Ausführungsform einer Vorrichtung 1 zum Regeln der Spannkraft eines umlaufenden Bandes 2. Das Band 2 wird in diesem Ausführungsbeispiel von einem Siebband einer Entwässerungsvorrichtung 3 einer Papierherstellungsmaschine gebildet. Die Entwässerungsvorrichtung 3 weist eine drehbare Trommel 4 auf, die von einer nassen Papierbahn 5 umschlungen wird. Außenseitig wird das Band 2 gegen die Papierbahn 5 gedrückt, so daß die Papierbahn 5 zwischen dem Siebband 2 und der Trommel 4 gehalten ist. Das Band 2 steht dabei unter einer vorgegebenen Zugspannung, um die gewünschte Entwässerungswirkung für die Papierbahn 5 zu erzielen. Dabei wird das in der Papierbahn 5 enthaltene überschüssige Wasser aufgrund des Drucks des Siebbandes 2 durch dieses hindurchgepreßt. Zur Erzielung einer ausreichenden Entwässerungswirkung sind mehrere Entwässerungsvorrichtungen 3 hintereinander angeordnet.FIG. 1 shows a schematic representation of a first one Embodiment of a device 1 for controlling the Clamping force of a circulating belt 2. The belt 2 is in this embodiment of a wire of a dewatering device 3 of a papermaking machine educated. The dewatering device 3 has a rotatable Drum 4, which looped by a wet paper web 5 becomes. On the outside, the band 2 is against the paper web 5, so that the paper web 5 between the Sieve 2 and the drum 4 is held. The volume 2 stands under a given tension to the desired drainage effect for the paper web 5 too achieve. In this case, that is contained in the paper web 5 excess water due to the pressure of the sieve belt 2 squeezed through this. To achieve a sufficient Drainage effect are several drainage devices 3 arranged one behind the other.

Das Band 2 wird von vier Walzen 6, 7, 8, 9 umgelenkt. Dabei sind die Walzen 6, 9 in ihrer Achslage feststehend ausgebildet und dienen daher als reine Umlenkwalzen 6, 9. The band 2 is deflected by four rollers 6, 7, 8, 9. there the rollers 6, 9 are fixed in their axial position trained and therefore serve as pure guide rollers 6, 9th

Die Walze 7 ist in Pfeilrichtung 10 verschwenkbar gelagert und bildet eine Bandlaufregelwalze. Durch Verschwenken der Bandlaufregelwalze 7 kann das Band 2 in seiner Laufrichtung beeinflußt werden. Dies ist wichtig, um das Band 2 in Lage zu halten. Hierzu ist ein Kantenfühler 11 vorgesehen, der die Lage des Bandes 2 erfaßt und einem Bandlaufregler 12 zuführt. Dieser Bandlaufregler vergleicht das vom Kantenfühler 11 abgegebene Signal mit einem Sollwert und steuert entsprechend einen nicht dargestellten Stellantrieb der Bandlaufregelwalze 7 an. Auf diese Weise wird eine Bandlaufregelung erzielt.The roller 7 is pivotally mounted in the direction of arrow 10 and forms a stripline roller. By pivoting the stripline roller 7, the band 2 in his Direction be affected. This is important to that To keep Volume 2 in place. For this purpose, an edge sensor 11 provided, which detects the position of the belt 2 and a Bandlaufregler 12 supplies. This tape controller compares the output from the edge sensor 11 signal with a Setpoint and controls accordingly a not shown Actuator of the strip roller 7. On In this way, a stripline control is achieved.

Zur Einstellung der gewünschten Zugkraft des umlaufenden Bandes 2 ist die Spannkraftregelwalze 8 durch einen Stellantrieb 13 in Pfeilrichtung 14 verstellbar. Je weiter die Spannkraftregelwalze 8 von der strichliert angedeuteten Darstellung nach rechts bewegt wird, um so höher wird die in das Band 2 eingebrachte Zugkraft.To set the desired pulling force of the circulating Bandes 2 is the tension control roller 8 by a Actuator 13 in the direction of arrow 14 adjustable. The farther the tension control roller 8 indicated by the dashed line Presentation is moved to the right, the higher becomes the introduced into the band 2 tensile force.

Um mit möglichst wenig Walzen 6, 7, 8, 9 auszukommen, ist die Spannkraftregelwalze 8 gleichzeitig als Kraftmeßwalze 15 ausgebildet. Zu diesem Zweck ist die Kraftmeßwalze 15 an beiden Lagern mit Kraftsensoren 16 ausgerüstet, die die Lagerkraft messen. Diese Kraftsensoren 16 ermitteln die Lagerkraft der Kraftmeßwalze 15 in zwei zueinander senkrecht stehenden Richtungen, so daß neben dem Betrag der Lagerkraft auch deren Richtung bestimmt werden kann.To get along with the least possible rollers 6, 7, 8, 9, is the tensioning roller 8 at the same time as Kraftmeßwalze 15 trained. For this purpose, the force measuring roller 15th equipped at both camps with force sensors 16, the measure the bearing force. Determine these force sensors 16 the bearing force of the force measuring roller 15 in two to each other vertical directions, so that in addition to the amount the bearing force and their direction can be determined.

Die Kraftsensoren 16 stehen mit einer Korrekturvorrichtung 17 in Wirkverbindung, welche aus der gemessenen vektoriellen Lagerkraft F die Bandzugkraft berechnet. Die Korrekturvorrichtung 17 berechnet dabei aus den vom Kraftsensor 16 ermittelten Werten folgenden Ausdruck für die Bandzugspannung S: S = | F | 2+2 cos(2α) The force sensors 16 are in operative connection with a correction device 17, which calculates the tape tensile force from the measured vectorial bearing force F. The correction device 17 calculates the following from the values determined by the force sensor 16 for the strip tension S: S = | F | 2 + 2 cos (2α)

Dabei ist |F| der Betrag der ermittelten Lagerkraft F und α der Winkel zwischen der gemessenen Kraftrichtung und der Bandlaufrichtung zwischen den Walzen 7 und 8. Lediglich zur Vereinfachung des Ausführungsbeispiels ist die Verstellrichtung der Spannkraftregelwalze 8 parallel zur Bandlaufrichtung zwischen den Walzen 7 und 8 gewählt, so daß sich eine einfache geometrische Bedingung für die Berechnung der Bandzugkraft F ergibt.Where | F | the amount of the determined bearing force F and α is the angle between the measured force direction and the tape running direction between the rollers 7 and 8. Merely to simplify the embodiment is the Adjustment of the tensioning roller 8 parallel to Tape running direction between the rollers 7 and 8 selected so that is a simple geometric condition for the calculation the tensile force F results.

Alternativ oder zusätzlich steht die Korrekturvorrichtung 17 mit einem Weggeber 18 in Wirkverbindung, der die jeweilige Position des Stellantriebs 13 erfaßt. Vorzugsweise steht der Weggeber 18 mit einer Antriebswelle 19 des Stellantriebs 13 in Wirkverbindung. Durch diese Verbindung erhält die Korrekturvorrichtung 17 ein Signal, welches die Position der Spannkraftregelwalze 8 wiedergibt. Der Korrekturvorrichtung 17 ist eine Speichervorrichtung 20 zugeordnet, in der die Positionen der Walzen 7 und 9 abgelegt sind. Damit sind der Korrekturvorrichtung 17 die Positionen der Walzen 7, 8 und 9 bekannt, so daß durch einfache trigonometrische Berechnungen die Zu- und Ablaufwinkel des Bandes 2 zur Kraftmeßwalze 8 bestimmt werden können. Dabei berechnet sich der Winkel α der Lagerkraftrichtung zu α = 12 arctan H x Alternatively or additionally, the correction device 17 is in operative connection with a displacement sensor 18, which detects the respective position of the actuator 13. Preferably, the displacement sensor 18 is in operative connection with a drive shaft 19 of the actuator 13. By this connection, the correction device 17 receives a signal representing the position of the tension control roller 8. The correction device 17 is associated with a storage device 20 in which the positions of the rollers 7 and 9 are stored. Thus, the correction device 17, the positions of the rollers 7, 8 and 9 are known, so that by simple trigonometric calculations, the inlet and outlet angle of the belt 2 can be determined for Kraftmeßwalze 8. In this case, the angle α calculated to the bearing force direction α = 1 2 arctan H x

Hierbei bedeuten H die Höhendifferenz zwischen den Walzen 8 und 9 in senkrechter Projektion auf die Bandebene zwischen den Walzen 7 und 8 und x die jeweilige Position der Spannkraftregelwalze 8, bezogen auf die Lage der Umlenkwalze 9. Die Lage x = 0 entspricht daher jener Lage der Spannkraftregelwalze 8, bei der diese senkrecht zur Ebene des umlaufenden Bandes, zwischen den Walzen 7 und 8 betrachtet, deckungsgleich zu liegen kommen. Diese Lage ist strichliert dargestellt. Damit kann die Bandzugkraft direkt aus der gemessenen Lagerkraft F, der Position der Walzen 7, 9 und der jeweiligen Lage x der Spannkraftregelwalze 8 bestimmt werden.H here means the height difference between the rolls 8 and 9 in vertical projection on the band plane between the rollers 7 and 8 and x the respective position of Clamping roller 8, based on the position of the guide roller 9. The position x = 0 therefore corresponds to that position of the Tensioning roller 8, in which these perpendicular to the plane of the circulating belt, viewed between the rollers 7 and 8, to be congruent. This location is shown in dashed lines. This allows the belt pull directly from the measured bearing force F, the position of the Rolls 7, 9 and the respective layer x of the tensioning roller 8 are determined.

Alternativ oder zusätzlich ist ein Sensor 24 vorgesehen, der das zur Kraftmeßwalze 15 zulaufende Trum des umlaufenden Bandes erfaßt. Grundsätzlich könnte auch das von der Kraftmeßwalze 15 ablaufende Trum des umlaufenden Bandes 2 von einem weiteren Sensor 24 erfaßt werden, dies ist jedoch im Ausführungsbeispiel nicht erforderlich, da die Lage dieses Trums unabhängig von der Stellung der Spannkraftregelwalze 8 ist.Alternatively or additionally, a sensor 24 is provided, the to the force measuring roller 15 tapered strand of the circulating Bandes recorded. Basically, that could also be from the force measuring roller 15 running strand of the circulating belt 2 are detected by another sensor 24, this However, in the embodiment is not required because the location of this run regardless of the position of Clamping roller 8 is.

Der Sensor 24 weist eine verschwenkbar abgestützte frei drehbare Rolle 25 auf, die federnd gegen das umlaufende Band 2 gedrückt wird. Der Sensor 24 weist außerdem ein Potentiometer 26 auf, welches des Schwenklage der Rolle 25 erfaßt und in ein elektrisches Signal umwandelt. Dieses elektrische Signal ist zur Umschlingung der Kraftmeßwalze 15 proportional und wird der Korrekturvorrichtung 17 zugeführt.The sensor 24 has a pivotally supported free rotatable roller 25, the resilient against the circumferential Volume 2 is pressed. The sensor 24 also has a Potentiometer 26 on which the pivoting position of the roller 25 detected and converted into an electrical signal. This electrical signal is for wrapping the force measuring roller 15 proportional and becomes the correction device 17 supplied.

Die Korrekturvorrichtung 17 steht mit einer Regeleinrichtung 21 in Wirkverbindung, welche die von der Korrekturvorrichtung 17 ermittelte Bandzugkraft als Ist-Wert entgegennimmt und mit einem Soll-Wert eines Sollwertgebers 22 vergleicht. Die Regeleinrichtung 21 hat vorzugsweise ein PID-Verhalten und wirkt mit seinem Ausgang 23 auf den Stellantrieb 13 ein. Damit kann durch Verstellen des vom Sollwertgeber 22 abgegebenen Sollwerts die gewünschte Bandzugspannung eingestellt werden, die anschließend von der Regeleinrichtung 21 durch Verstellen der Spannkraftregelwalze 8 ausgeregelt wird.The correction device 17 is connected to a control device 21 in operative connection, which by the correction device 17 determined band tension as the actual value receives and with a desired value of a setpoint generator 22 compares. The control device 21 preferably has a PID behavior and acts with its output 23 on the Actuator 13 a. This can be done by adjusting the of Setpoint generator 22 output desired value Bandzugspannung be adjusted, which then by the control device 21 by adjusting the tension control roller 8 is corrected.

Die Figur 2 zeigt eine schematische Darstellung einer zweiten Ausführungsform der Vorrichtung 1 gemäß Figur 1, wobei gleiche Bezugszeichen gleiche Teile benennen. Im folgenden werden nur die Unterschiede zur Ausführungsform gemäß Figur 1 erläutert. Die Vorrichtung 1 gemäß Figur 2 dient zum Erfassen und Regeln der Spannkraft einer laufenden Bahn 2, die über Walzen 6, 15 umgelenkt und auf einen Wickler 27 aufgewickelt wird. Bei umgekehrter Bahnlaufrichtung könnte der Wickler 27 auch als Abwickler eingesetzt werden.FIG. 2 shows a schematic representation of a second embodiment of the device 1 according to FIG. 1, wherein like reference numerals designate like parts. in the following are only the differences from the embodiment explained according to FIG. The device 1 according to FIG. 2 serves to capture and regulate the elasticity of a running Lane 2, which is deflected over rollers 6, 15 and up a winder 27 is wound up. In reverse web direction could the winder 27 as an unwinder be used.

Die Walze 15 ist als Kraftmeßwalze ausgebildet, deren Lagerkräfte mit Hilfe des Kraftsensors 16 vektoriell erfaßt werden. Die Kraftmeßwalze 15 ist in Pfeilrichtung 14 mittels des Stellantriebs 13 verstellbar, um die gewünschte Spannkraft der Bahn 2 einzustellen. Der Umschlingungswinkel α der Kraftmeßwalze 15 wird einerseits durch die Lage der Kraftmeßwalze 15 und andererseits durch den Durchmesser des Wicklers 27 bestimmt. Dieser Durchmesser ändert sich je nach Fortschritt des Auf- bzw. Abwickelvorgangs. Aufgrund der vektoriellen Erfassung der Lagerkraft der Kraftmeßwalze 15 kann trotzdem die Bahnzugkraft ausreichend exakt ermittelt werden. The roller 15 is designed as a force measuring roller whose bearing forces detected vectorially by means of the force sensor 16 become. The force measuring roller 15 is in the direction of arrow 14 by means of the actuator 13 adjustable to the desired Adjust tension of the web 2. The wrap angle α of the force measuring roller 15 is on the one hand by the situation the force measuring roller 15 and on the other hand by the diameter of the winder 27 determined. This diameter changes depending on the progress of the winding or unwinding process. Due to the vectorial recording of the bearing force of the Force measuring roller 15 can still sufficient the web tension be determined exactly.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Vorrichtungcontraption
22
Bandtape
33
Entwässerungsvorrichtungdehydrator
44
Trommeldrum
55
Papierbahnpaper web
66
Umlenkwalzedeflecting
77
BandlaufregelwalzeTape control roll
88th
SpannkraftregelwalzeTension regulating roller
99
Umlenkwalzedeflecting
1010
Pfeilrichtungarrow
1111
Kantenfühleredge sensor
1212
BandlaufreglerTape Controller
1313
Stellantriebactuator
1414
Pfeilrichtungarrow
1515
Kraftmeßwalzeforce measuring
1616
Kraftsensorforce sensor
1717
Korrekturvorrichtungcorrector
1818
Weggeberencoder
1919
Antriebswelledrive shaft
2020
Speichervorrichtungstorage device
2121
Regeleinrichtungcontrol device
2222
SollwertgeberSetpoint generator
2323
Ausgangoutput
2424
Sensorsensor
2525
Rollerole
2626
Potentiometerpotentiometer
2727
Wicklerwinders
FF
Lagerkraftbearing force
HH
WalzenabstandPlaten Gap
xx
Stellungposition
αα
UmschlingungswinkelWrap angle

Claims (12)

Vorrichtung zum Regeln der Spannkraft einer laufenden Bahn (2), insbesondere eines umlaufenden Bandes (2) zur Bespannung einer Zellstoffentwässerungs-, Papierherstellungs- oder einer Streichmaschine, wobei die Bahn (2) an Walzen (6, 7, 8, 9, 15) umgelenkt ist, von denen mindestens eine als Kraftmeßwalze (15) ausgebildet ist, welche mindestens einen Kraftsensor (16) zur Messung der Lagerkraft (F) aufweist und mindestens eine der Walzen (6, 7, 8, 9) als Spannkraftregelwalze (18) ausgebildet ist, welche von einem Stellantrieb (13) verstellbar gehalten ist, der mit dem Kraftsensor (16) über eine Regeleinrichtung (21) in Wirkverbindung steht, dadurch gekennzeichnet, daß der Kraftsensor (16) mit einer Korrekturvorrichtung (17) in Wirkverbindung steht, welche die Bahnzugkraft aus der Lagerkraft (F) und einem von der Umschlingung der Kraftmeßwalze (15) abhängigen Wert berechnet und an die Regeleinrichtung (21) weiterleitet, wobei sich die Umschlingung der Kraftmeßwalze (15) ändert.Device for regulating the tension of a moving web (2), in particular a circulating belt (2) for covering a pulp dewatering, papermaking or coating machine, the web (2) being connected to rollers (6, 7, 8, 9, 15) at least one of which is designed as a force measuring roller (15) which has at least one force sensor (16) for measuring the bearing force (F) and at least one of the rollers (6, 7, 8, 9) as a tension control roller (18) is, which is held adjustable by an actuator (13) which is in operative connection with the force sensor (16) via a control device (21), characterized in that the force sensor (16) with a correction device (17) is in operative connection, which the web tension is calculated from the bearing force (F) and a value dependent on the looping of the force measuring roller (15) and forwarded to the control device (21), the loop of the force measuring roller (15) changing. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Korrekturvorrichtung (17) von der Lage der Spannkraftregelwalze (8) beeinflußt ist.Device according to Claim 1, characterized in that the correction device (17) is influenced by the position of the tension-regulating roller (8). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Korrekturvorrichtung (17) von der relativen Lage der Kraftmeßwalze (15) und den benachbarten Walzen (7, 9) beeinflußt ist. Device according to claim 1 or 2, characterized in that the correction device (17) is influenced by the relative position of the force measuring roller (15) and the adjacent rollers (7, 9). Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Korrekturvorrichtung (17) eine Speichervorrichtung (20) zugeordnet ist, in der zumindest die Lagen der feststehenden Walzen (7, 9) abgelegt sind, welche der Kraftmeßwalze (15) benachbart sind.Apparatus according to claim 3, characterized in that the correction device (17) is associated with a storage device (20) in which at least the layers of the fixed rollers (7, 9) are stored, which are the force measuring roller (15) adjacent. Vorrichtung nach mindestens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Korrekturvorrichtung (17) von mindestens zwei Kraftsensoren (16) der Kraftmeßwalze (15) beeinflußt ist, welche die Lagerkraft der Kraftmeßwalze (15) vektoriell erfassen, um die Umschlingung der Kraftmeßwalze (15) zu berechnen.Device according to at least one of claims 1 to 4, characterized in that the correction device (17) is influenced by at least two force sensors (16) of the force measuring roller (15), which vectorially detect the bearing force of the force measuring roller (15) around the looping around the force measuring roller (15). Vorrichtung nach mindestens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Spannkraftregelwalze (8) und die Kraftmeßwalze (15) von derselben Walze (8, 15) gebildet sind.Device according to at least one of Claims 1 to 4, characterized in that the tensioning-force control roller (8) and the force-measuring roller (15) are formed by the same roller (8, 15). Vorrichtung nach mindestens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß alle Walzen (6, 7, 8, 9, 15) dieselbe Bandseite erfassen.Device according to at least one of claims 1 to 6, characterized in that all rollers (6, 7, 8, 9, 15) detect the same hinge side. Verfahren zum Regeln der Spannkraft einer laufenden Bahn (2), insbesondere eines umlaufenden Bandes (2) zur Bespannung einer Zellstoffentwässerungs-, Papierherstellungs- oder einer Streichmaschine, wobei die Bahn (2) von Walzen (6, 7, 8, 9, 15) umgelenkt wird, von denen mindestens eine als Kraftmeßwalze (15) ausgebildet ist, deren Lagerkraft (F) gemessen wird und mindestens eine der Walzen (6, 7, 8, 9, 15) als Spannkraftregelwalze (8) ausgebildet ist, die von einem Stellantrieb (13) durch Regeln der Bandzugkraft verstellt wird, dadurch gekennzeichnet, daß die Kraftmeßwalze (15) bei der Verstellung des Stellantriebs (13) unterschiedlich umschlungen wird, wobei die Bahnzugkraft aus der gemessenen Lagerkraft (F) der Kraftmeßwalze (15) und einem von der Umschlingung der Kraftmeßwalze (15) abhängigen Wert berechnet wird.Method for regulating the tension of a moving web (2), in particular a circulating belt (2) for covering a pulp dewatering, papermaking or coater, the web (2) being provided by rollers (6, 7, 8, 9, 15) is deflected, of which at least one is designed as Kraftmeßwalze (15) whose bearing force (F) is measured and at least one of the rollers (6, 7, 8, 9, 15) as a tension control roller (8) is formed by an actuator (13) is adjusted by regulating the strip tension, characterized in that the force measuring roller (15) is wrapped differently during the adjustment of the actuator (13), wherein the web tension from the measured bearing force (F) of the force measuring roller (15) and one of the Looping the force measuring roller (15) dependent value is calculated. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die Bahnzugkraft aus der gemessenen Lagerkraft (F) der Kraftmeßwalze (15) und einem Korrekturfaktor berechnet wird, der von den Positionen der einzelnen Walzen (6, 7, 8, 9, 15) sowie die sich verändernde Lage (x) der Spannkraftregelwalze (8) beeinflußt ist.A method according to claim 8, characterized in that the web tension is calculated from the measured bearing force (F) of the force measuring roller (15) and a correction factor derived from the positions of the individual rollers (6, 7, 8, 9, 15) and the changing position (x) of the tension control roller (8) is affected. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß die Lagerkraft (F) der Kraftmeßwalze (8) vektoriell erfaßt wird, wobei aus der Richtung der Lagerkraft (F) die Umschlingung der Kraftmeßwalze (8) durch die Bahn (2) berechnet wird, um einen Korrekturfaktor zur Berechnung der Bahnzugkraft aus der gemessenen Lagerkraft (F) zu ermitteln.A method according to claim 8 or 9, characterized in that the bearing force (F) of the force measuring roller (8) is vectorially detected, wherein from the direction of the bearing force (F) the wrap of the force measuring roller (8) through the web (2) is calculated, to determine a correction factor for calculating the web tension from the measured bearing force (F). Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß die Bahn (2) von mindestens einem Sensor (24) abgetastet wird, der ein von der Umschlingung der Kraftmeßwalze abhängiges Signal erzeugt.Method according to claim 9, characterized in that the web (2) is scanned by at least one sensor (24) which generates a signal dependent on the wrap of the force measuring roll. Verfahren nach mindestens einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, daß die Kraftmeßwalze (8) einem Wickler (27) zugeordnet ist.Method according to at least one of Claims 8 to 11, characterized in that the force-measuring roller (8) is associated with a winder (27).
EP04012854A 2003-06-06 2004-06-01 Device and method for controlling the tension force of a moving web Expired - Lifetime EP1484443B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04012854T PL1484443T3 (en) 2003-06-06 2004-06-01 Device and method for controlling the tension force of a moving web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10326133A DE10326133B4 (en) 2003-06-06 2003-06-06 Apparatus and method for controlling the tension of a circulating belt
DE10326133 2003-06-06

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EP1484443A1 true EP1484443A1 (en) 2004-12-08
EP1484443B1 EP1484443B1 (en) 2007-08-22

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EP (1) EP1484443B1 (en)
JP (1) JP4868487B2 (en)
AT (1) ATE371053T1 (en)
DE (3) DE10326133B4 (en)
ES (1) ES2291773T3 (en)
PL (1) PL1484443T3 (en)

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DE502004004697D1 (en) 2007-10-04
ATE371053T1 (en) 2007-09-15
US20040245363A1 (en) 2004-12-09
PL1484443T3 (en) 2008-01-31
JP2004360166A (en) 2004-12-24
DE10326133B4 (en) 2009-04-30
EP1484443B1 (en) 2007-08-22
US7059984B2 (en) 2006-06-13
JP4868487B2 (en) 2012-02-01
ES2291773T3 (en) 2008-03-01
DE20311822U1 (en) 2003-11-20
DE10326133A1 (en) 2005-01-13

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