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EP0331812B1 - Device for positioning the slice bar - Google Patents

Device for positioning the slice bar Download PDF

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Publication number
EP0331812B1
EP0331812B1 EP88121062A EP88121062A EP0331812B1 EP 0331812 B1 EP0331812 B1 EP 0331812B1 EP 88121062 A EP88121062 A EP 88121062A EP 88121062 A EP88121062 A EP 88121062A EP 0331812 B1 EP0331812 B1 EP 0331812B1
Authority
EP
European Patent Office
Prior art keywords
slice bar
servomotors
servo
thrust
slice
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88121062A
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German (de)
French (fr)
Other versions
EP0331812A1 (en
Inventor
Rudolf Münch
Peter Dr. Ficklscherer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sulzer Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT88121062T priority Critical patent/ATE77857T1/en
Publication of EP0331812A1 publication Critical patent/EP0331812A1/en
Application granted granted Critical
Publication of EP0331812B1 publication Critical patent/EP0331812B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices

Definitions

  • the invention relates to a device for adjusting an orifice blade at the outlet gap of a headbox of a paper machine, with drivable actuating elements which are arranged at suitable intervals parallel to and connected to the orifice blade in order to introduce a force onto the orifice blade at the connection points, the actuating elements being at one rigid, stationary supports are supported spindles and servomotors are provided to drive them.
  • the diaphragm blade which can be moved vertically to the material flow in the outlet gap of the paper machine, is used to adjust the clear width of the outlet gap over its entire width.
  • the setting of the diaphragm blade from an actual position to a desired position takes place with elastic deformation of the diaphragm blade in each case in the area of the connection points between the adjusting elements and the diaphragm blade while introducing the force required for this. This is initiated via the adjusting elements, which are moved in the corresponding direction via a corresponding push path and are stopped and locked after reaching the predetermined end points of the target position.
  • the adjusting elements are moved either individually, in groups or together.
  • actuating elements move together at the same time, they all have approximately the same thrust speed, with the exception of any acceleration or braking.
  • the thrust distances to be covered for setting a target position in particular according to a curve line, are of different lengths, some end points become earlier with the same thrust speed of all the control elements involved achieved than the rest.
  • undesirable bending stresses can then occur in the aperture blade, which can possibly lead to permanent plastic deformation of the aperture blade, although the adjustment of the aperture blade to be carried out from its actual position to its desired position is definitely in the area of it elastic deformability.
  • EP-A 0 232 022 shows a number of motor-driven adjusting spindles acting on the diaphragm blade, a force limiter being intended to prevent damaging forces on the device. The adjustment options are then no longer fully usable.
  • the object of the invention is to design a device for adjusting the diaphragm blade, which device enables an adjusting method in which the unnecessary bending stresses in the diaphragm blade are avoided during the adjusting process.
  • the device to be designed is designed according to the invention in such a way that the desired thrust speed and the desired thrust path to be covered for the actuating element can be set for the actuating element on the actuating motors before the actuating motor starts, and that all actuating motors can be started simultaneously or after Reaching the desired target position of the diaphragm blade can be switched off at the same time.
  • Adjusting spindles and, in an advantageous embodiment, actuating motors, electric stepping motors are used as actuating elements, in which the number of steps and their frequency can be set for the period of a setting process, all actuating motors being able to be moved simultaneously during the period during an actuating process.
  • the device for adjusting an elastic diaphragm blade 1 is arranged at the outlet gap of a headbox of a paper machine.
  • the aperture blade 1 is shown in the drawing with a solid line, the headbox is not shown.
  • drivable adjusting elements 2 are provided, which are arranged at suitable intervals parallel to the diaphragm blade 1 and connected to the latter. A force is thus introduced at the connection points 3 onto the diaphragm blade 1.
  • the adjusting elements 2 are supported on a rigid, fixed support 4.
  • Servomotors 5 are provided for driving the control elements.
  • Start of the servomotor 5 are adjustable. They can be started all at once, all together and at the same time, or can be switched off after reaching the desired position. In this way, the desired push path 6 is covered in time t from each connection point 3.
  • the actuating elements 2 are designed as rotatable adjusting spindles, with electric stepping motors operating in time being used to drive them, in which the number of steps required to cover the desired thrust travel 6 and the frequency of the steps within a desired time period t in of which the thrust distance is to be covered, from which the thrust speed v results, can be set.
  • the servomotors can all be moved together at the same time during an adjustment process and at the same time can be moved over the same period of time.
  • an adjustment process is carried out as follows: For each spindle 2, the thrust distance to be covered by it is from an actual point, which is marked in the drawing with a ring, to a target end point, which is marked with a triangle in the drawing, calculated and on the assigned servomotor entered the number of steps required to cover the calculated thrust 6. The frequency of the steps is then entered in a time period t within which the push path 6 is to be covered. The time period t is the same for all adjusting spindles 2 in the setting process, so that the individual adjusting spindles 2 are moved within a period of time with different pushing speeds when covering the possibly different long pushing paths 6.
  • the ratio of the thrust speeds v is directly proportional to the ratio of the length of the thrust paths 6 1 and 6 2.
  • the adjusting spindles 2 are moved at different thrust speeds, so that they cover different thrust paths in the same time span.
  • the aperture blade 1 is deformed equally and regularly within its elastic deformability, without anywhere excessive bending stresses arise. There are no kinks.
  • the proposed setting process and the device for setting an aperture blade can be controlled and programmed using known electronic means.

Landscapes

  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Steroid Compounds (AREA)
  • Control Of Multiple Motors (AREA)
  • Paper (AREA)
  • Diaphragms For Cameras (AREA)
  • Making Paper Articles (AREA)
  • Control Of Turbines (AREA)

Abstract

To achieve uniform and regular adjustment of a slice bar (1) within the limits of its elastic deformability, it is proposed that the slice bar (1) provided at the discharge gap of a headbox on a paper-making machine is capable of being moved by positioning elements (2) driven by servo-motors (5), the positioning elements being arranged at suitable intervals parallel to the slice bar (1) and connected to it so as to be able to apply a force to the connecting points (3) on the slice bar (1). It is possible to adjust each servo-motor (5) in a setting procedure to provide the currently-desired speed of thrust and the currently-desired length of stroke (6) for the positioning element (2) prior to the start up of the servo-motor (5). All the servo-motors (5) are started at the same time or, after the desired set-point position of the slice bar (1) has been reached, are switched off simultaneously. Electric stepping motors working in unison are particularly suitable for this purpose. The device and the setting procedure it offers are capable of being controlled and programmed by known electronic means. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Einstellen einer Blendenklinge am Auslaufspalt eines Stoffauflaufes einer Papiermaschine, mit antreibbaren Stellelementen, die in geeigneten Abständen parallel zur Blendenklinge angeordnet und mit dieser verbunden sind, um an den Verbindungsstellen auf die Blendenklinge eine Kraft einzuleiten, wobei die Stellelemente an einem starren, ortsfesten Träger abgestützte Spindeln sind und zu deren Antrieb Stellmotoren vorgesehen sind.The invention relates to a device for adjusting an orifice blade at the outlet gap of a headbox of a paper machine, with drivable actuating elements which are arranged at suitable intervals parallel to and connected to the orifice blade in order to introduce a force onto the orifice blade at the connection points, the actuating elements being at one rigid, stationary supports are supported spindles and servomotors are provided to drive them.

Wie in der Branche bekannt, dient die vertikal zum Stoffstrom in dem Auslaufspalt der Papiermaschine verschiebbare Blendenklinge zum bedartsmäßigen Einstellen der lichten Weite des Auslaufspaltes über seine gesamte Breite. Die Einstellung der Blendenklinge von einer Ist-Position in eine Soll-Position erfolgt unter elastischer Verformung der Blendenklinge jeweils im Bereich der Verbindungsstellen zwischen den Stellelementen und der Blendenklinge unter Einleitung der dazu jeweils notwendigen Kraft. Diese wird über die Stellelemente eingeleitet, die dazu in der entsprechenden Richtung über einen entsprechenden Schubweg bewegt werden und nach Erreichen der vorbestimmten Endpunkte der Soll-Position angehalten und arretiert werden.As is known in the industry, the diaphragm blade, which can be moved vertically to the material flow in the outlet gap of the paper machine, is used to adjust the clear width of the outlet gap over its entire width. The setting of the diaphragm blade from an actual position to a desired position takes place with elastic deformation of the diaphragm blade in each case in the area of the connection points between the adjusting elements and the diaphragm blade while introducing the force required for this. This is initiated via the adjusting elements, which are moved in the corresponding direction via a corresponding push path and are stopped and locked after reaching the predetermined end points of the target position.

Nach dem bisherigen Einstellverfahren mit den bisherigen Vorrichtungen werden die Stellelemente entweder einzeln, in Gruppen oder gemeinsam bewegt. Bei einer gemeinsamen, gleichzeitigen Bewegung mehrerer Stellelemente haben alle etwa die gleiche Schubgeschwindigkeit, mit Ausnahme von eventuellen Beschleunigungs- oder Bremsvorgängen. Da die zurückzulegenden Schubwege zur Einstellung einer Soll-Position, insbesondere gemäß einer Kurvenlinie, verschieden lang sind, werden einige Endpunkte bei gleicher Schubgeschwindigkeit aller beteiligten Stellelemente früher erreicht als die übrigen. Im Bereich des jeweils bereits erreichten Endpunkts kann es dann zu unerwünschten Biegespannungen in der Blendenklinge kommen, die gegebenenfalls zu einer bleibenden plastischen Verformung der Blendenklinge führen können, obwohl das auszuführende Einstellen der Blendenklinge von ihrer Ist-Position zu ihrer Soll-Position durchaus im Bereich ihrer elastischen Verformbarkeit läge.According to the previous setting procedure with the previous devices, the adjusting elements are moved either individually, in groups or together. When several actuating elements move together at the same time, they all have approximately the same thrust speed, with the exception of any acceleration or braking. Since the thrust distances to be covered for setting a target position, in particular according to a curve line, are of different lengths, some end points become earlier with the same thrust speed of all the control elements involved achieved than the rest. In the area of the end point already reached, undesirable bending stresses can then occur in the aperture blade, which can possibly lead to permanent plastic deformation of the aperture blade, although the adjustment of the aperture blade to be carried out from its actual position to its desired position is definitely in the area of it elastic deformability.

So zeigt zwar die EP-A 0 232 022 eine Anzahl von auf die Blendenklinge wirkenden motorisch angetriebenen Stellspindeln, wobei ein Kraftbegrenzer schädliche Kräfte auf die Vorrichtung verhindern soll. Die Möglichkeiten zur Verstellung sind dann aber nicht mehr voll nutzbar.For example, EP-A 0 232 022 shows a number of motor-driven adjusting spindles acting on the diaphragm blade, a force limiter being intended to prevent damaging forces on the device. The adjustment options are then no longer fully usable.

Aufgabe der Erfindung ist, eine Vorrichtung zum Einstellen der Blendenklinge zu gestalten, welche Vorrichtung ein Stellverfahren ermöglicht, bei dem die unnötigen Biegespannungen in der Blendenklinge während des Stellvorganges vermieden werden.The object of the invention is to design a device for adjusting the diaphragm blade, which device enables an adjusting method in which the unnecessary bending stresses in the diaphragm blade are avoided during the adjusting process.

Zur Lösung dieser Aufgabe wird die zu gestaltende Vorrichtung erfindungsgemäß so ausgeführt, daß bei den Stellmotoren an jedem einzelnen die gewünschte Schubgeschwindigkeit und der jeweils gewünschte zurückzulegende Schubweg für das Stellelement vor dem Start des Stellmotors einstellbar sind, und daß alle Stellmotoren gleichzeitig startbar, bzw. nach Erreichen der erwünschten Soll-Position der Blendenklinge gleichzeitig abschaltbar sind.To achieve this object, the device to be designed is designed according to the invention in such a way that the desired thrust speed and the desired thrust path to be covered for the actuating element can be set for the actuating element on the actuating motors before the actuating motor starts, and that all actuating motors can be started simultaneously or after Reaching the desired target position of the diaphragm blade can be switched off at the same time.

Damit läßt sich die Steuerung der Stellmotoren so programmieren, daß die Stellelemente alle gleichzeitig und innerhalb einer Zeitspanne die gegebenenfalls verschieden langen Schubwege zu den Endpunkten mit den jeweils zu der Länge der Schubwege direkt proportional eingestellten Schubgeschwindigkeiten zurücklegen, wobei die Blendenklinge auf ihrer ganzen Breite gleichmäßig und regelmäßig lediglich innerhalb des Bereiches ihrer elastischen Verformbarkeit gebogen wird, so daß keine unnötigen Biegespannungen dabei entstehen.This allows the control of the servomotors to be programmed so that the control elements all simultaneously and within a period of time cover the possibly different length of the thrust paths to the end points with the thrust speeds set directly proportional to the length of the thrust paths, the aperture blade being uniform over its entire width is regularly bent only within the range of its elastic deformability, so that no unnecessary bending stresses thereby arise.

Als Stellelemente werden Stellspindeln und in einer vorteilhaften Ausführungsform als Stellmotoren elektrische Schrittmotoren verwendet, bei denen die Anzahl der Schritte und deren Frequenz für die Zeitspanne eines Einsteilvorganges einstellbar sind, wobei alle Stellmotoren bei einem Stell-Vorgang gleichzeitig während der Zeitspanne fahrbar sind.Adjusting spindles and, in an advantageous embodiment, actuating motors, electric stepping motors are used as actuating elements, in which the number of steps and their frequency can be set for the period of a setting process, all actuating motors being able to be moved simultaneously during the period during an actuating process.

Im weiteren werden der Erfindungsgegenstand und die mit ihm erzielbaren Vorteile näher beschrieben und erklärt. Die Beschreibung bezieht sich auf eine Zeichnung, in welcher zeigen:

Fig. 1
schematisch ein Ausführungsbeispiel der Vorrichtung mit eingezeichneter Ist- und Soll-Position der Blendenklinge,
Fig. 2
ein Diagramm des Einstellvorgangs nach dem bisherigen Verfahren,
Fig. 3
ein Diagramm des Einstellvorgangs nach dem neuen Verfahren und
Fig. 4
ein Diagramm der Bewegungen zweier Stellelemente während einer Zeitspanne.
The subject matter of the invention and the advantages which can be achieved with it are described and explained in more detail below. The description refers to a drawing, in which:
Fig. 1
schematically an embodiment of the device with the drawn actual and target position of the diaphragm blade,
Fig. 2
a diagram of the setting process according to the previous method,
Fig. 3
a diagram of the setting process according to the new method and
Fig. 4
a diagram of the movements of two actuators during a period.

Die Vorrichtung zum Einstellen einer elastischen Blendenklinge 1 ist am Auslaufspalt eines Stoffauflaufes einer Papiermaschine angeordnet. Die Blendenklinge 1 ist in der Zeichnung jeweils mit einer durchgezogenen Linie dargestellt, der Stoffauflauf ist nicht gezeichnet. Zum Verschieben der Blendenklinge 1 sind antreibbare Stellelemente 2 vorgesehen, die in geeigneten Abständen parallel zur Blendenklinge 1 angeordnet und mit dieser verbunden sind. Damit wird an den Verbindungsstellen 3 auf die Blendenklinge 1 eine Kraft eingeleitet. Die Stellelemente 2 sind an einem starren, ortsfesten Träger 4 abgestützt. Zum Antrieb der Stellelemente sind Stellmotoren 5 vorgesehen. Sie sind so einstell- bzw. regulierbar, daß bei jedem der Stellmotoren 5 für den jeweils vorzunehmenden Einstellvorgang die zum Zurücklegen des Schubwegs gewünschte Schubgeschwindigkeit v für die Dauer des Einstellvorganges, der Zeitspanne t, vor dem Start des Stellmotors 5 einstellbar sind. Sie sind auf einmal, alle zusammen und gleichzeitig startbar, bzw. nach Erreichen der jeweils gewünschten Soll-Position abschaltbar. Auf diese Weise wird von jeder Verbindungsstelle 3 der gewünschte Schubweg 6 in der Zeitspanne t zurückgelegt.The device for adjusting an elastic diaphragm blade 1 is arranged at the outlet gap of a headbox of a paper machine. The aperture blade 1 is shown in the drawing with a solid line, the headbox is not shown. To move the diaphragm blade 1, drivable adjusting elements 2 are provided, which are arranged at suitable intervals parallel to the diaphragm blade 1 and connected to the latter. A force is thus introduced at the connection points 3 onto the diaphragm blade 1. The adjusting elements 2 are supported on a rigid, fixed support 4. Servomotors 5 are provided for driving the control elements. They are adjustable or adjustable so that for each of the servomotors 5 the thrust speed v required to cover the thrust travel for the duration of the adjustment process, the period of time t, before that Start of the servomotor 5 are adjustable. They can be started all at once, all together and at the same time, or can be switched off after reaching the desired position. In this way, the desired push path 6 is covered in time t from each connection point 3.

Die Stellelemente sind 2 als drehbare Stellspindeln ausgebildet, wobei zu deren Antrieb im Takt arbeitende elektrische Schrittmotoren verwendet werden, bei denen die Anzahl der Schritte, die zum Zurücklegen des gewünschten Schubweges 6 notwendig sind, und die Frequenz der Schritte innerhalb einer gewünschten Zeitspanne t, in der der Schubweg zurückzulegen ist, woraus sich die Schubgeschwindigkeit v ergibt, einstellbar sind. Die Stellmotoren sind jeweils bei einem Einstellvorgang alle auf einmal zusammen und gleichzeitig über eine für alle gleiche Zeitspanne fahrbar.The actuating elements 2 are designed as rotatable adjusting spindles, with electric stepping motors operating in time being used to drive them, in which the number of steps required to cover the desired thrust travel 6 and the frequency of the steps within a desired time period t in of which the thrust distance is to be covered, from which the thrust speed v results, can be set. The servomotors can all be moved together at the same time during an adjustment process and at the same time can be moved over the same period of time.

Mit dieser Vorrichtung wird ein Einstellvorgang wie folgt vollzogen:
Es wird für jede Spindel 2 der von ihr zurückzulegende Schubweg von einem Ist-Punkt, dieser ist in der Zeichnung jeweils mit einem Ring markiert, zu einem Soll-Endpunkt, dieser ist jeweils mit einem Dreieck in der Zeichnung markiert, errechnet und am zugeordneten Stellmotor die Anzahl der Schritte eingegeben, die zum Zurücklegen des errechneten Schubwegs 6 notwendig sind. Dann wird die Frequenz der Schritte in einer Zeitspanne t eingegeben, innerhalb welcher der Schubweg 6 zurückzulegen ist. Die Zeitspanne t ist für alle Stellspindeln 2 bei dem Einstellvorgang die gleiche, so daß die einzelnen Stellspindeln 2 beim Zurücklegen der gegebenenfalls verschieden langen Schubwege 6 innerhalb einer Zeitspanne mit verschiedener Schubgeschwindigkeit bewegt werden. Das heißt: Diejenigen, die einen kürzeren Schubweg 6 durchfahren sollen, werden langsamer bewegt, und diejenigen, die einen längeren Schubweg 6 durchfahren sollen, werden schneller bewegt. Nach einem gleichzeitigen Start der Stellmotoren 5 erreichen damit alle Stellspindeln 2 innerhalb derselben Zeitspanne t zum gleichen Moment die von ihnen zu erreichenden Soll-Endpunkte. Dieser Vorgang ist in dem Diagramm in Fig. 4 am Beispiel von zwei Stellspindeln 2¹ und 2² besonders deutlich dargestellt: Für die Stellspindel 2¹ ist ein Schubweg 6¹ und für die Stellspindel 2² ein Schubweg 6² errechnet. Den zugeordneten Stellmotoren werden die Schrittanzahl und die Schrittfrequenz eingegeben. Dadurch soll die Spindel 2² schneller bewegt werden als die Spindel 2¹. Das Verhältnis der Schubgeschwindigkeiten v ist direkt proportional zu dem Verhältnis der Länge der Schubwege 6¹ und 6². Nach gemeinsamem gleichzeitigen Start der Stellmotoren folgt gegebenenfalls eine Beschleunigungsphase, bis die eingestellten Schubgeschwindigkeiten v erreicht werden: Innerhalb einer Zeitspanne t werden die Soll-Endpunkte erreicht. Nach gemeinsamem Abschalten der Stellmotoren folgt gegebenenfalls eine Bremsphase bis zum Stillstand der Stellmotoren, bzw. der Stellspindeln 2¹ und 2².With this device, an adjustment process is carried out as follows:
For each spindle 2, the thrust distance to be covered by it is from an actual point, which is marked in the drawing with a ring, to a target end point, which is marked with a triangle in the drawing, calculated and on the assigned servomotor entered the number of steps required to cover the calculated thrust 6. The frequency of the steps is then entered in a time period t within which the push path 6 is to be covered. The time period t is the same for all adjusting spindles 2 in the setting process, so that the individual adjusting spindles 2 are moved within a period of time with different pushing speeds when covering the possibly different long pushing paths 6. That is, those who are supposed to travel through a shorter push path 6 are moved more slowly, and those who are supposed to go through a longer push path 6 are moved faster. After a simultaneous start of the servomotors 5, all the adjusting spindles 2 reach the desired end points to be reached by them within the same time period t. This process is in the diagram in Fig. 4 Example of two adjusting spindles 2¹ and 2² shown particularly clearly: A pushing path 6¹ is calculated for the adjusting spindle 2¹ and a pushing path 6² for the adjusting spindle 2². The number of steps and the step frequency are entered for the assigned servomotors. This should move the spindle 2² faster than the spindle 2¹. The ratio of the thrust speeds v is directly proportional to the ratio of the length of the thrust paths 6 1 and 6 2. After the servomotors have been started together at the same time, an acceleration phase may follow until the set thrust speeds v are reached: the target end points are reached within a period of time t. After the actuators have been switched off together, there may be a braking phase until the actuators or the adjusting spindles 2 1 and 2 2 come to a standstill.

Der Vorteil dieses Einstellvorganges ergibt sich aus einem Vergleich mit dem bisherigen Vorgang. In Fig. 2 ist der bisherige Einstellvorgang und in Fig. 3 der oben beschriebene Einstellvorgang schematisch dargestellt. Die Darstellungen zeigen jeweils die Situation, in der der Einstellvorgang noch nicht beendet ist. Da nach dem bisherigen Verfahren alle Stellspindeln 2 mit der gleichen Schubgeschwindigkeit bewegt werden, legen sie in derselben Zeitspanne einen gleich langen Schubweg zurück. Da die Soll-Position an einigen Stellen früher erreicht wird als an anderen, entstehen an gewissen momentan erreichten Punkten Knickstellen, diese sind mit Pfeilen in der Zeichnung markiert, an denen unerwünschte Biegespannungen in der Blendenklinge 1 auftreten. Diese können oberhalb der elastischen Verformbarkeit der Blendenklinge 1 liegen und zu einer schädlichen plastischen Verformung der Blendenklinge 1 führen.The advantage of this setting process results from a comparison with the previous process. In Fig. 2 the previous adjustment process and in Fig. 3 the adjustment process described above is shown schematically. The illustrations show the situation in which the setting process has not yet ended. Since, according to the previous method, all adjusting spindles 2 are moved with the same thrust speed, they cover an equally long thrust path in the same time span. Since the desired position is reached earlier in some places than in others, kinks occur at certain points currently reached, these are marked with arrows in the drawing, at which undesired bending stresses occur in the aperture blade 1. These can lie above the elastic deformability of the aperture blade 1 and can lead to a harmful plastic deformation of the aperture blade 1.

Im Gegensatz dazu werden gemäß des vorgeschlagenen Einstellvorganges die Stellspindeln 2 mit unterschiedlicher Schubgeschwindigkeit bewegt, so daß sie unterschiedliche Schubwege in derselben Zeitspanne zurücklegen. Dabei wird die Blendenklinge 1 gleich- und regelmäßig innerhalb ihrer elastischen Verformbarkeit verformt, ohne daß irgendwo übermäßige Biegespannungen entstehen. Es entstehen keine Knickstellen.In contrast to this, according to the proposed setting process, the adjusting spindles 2 are moved at different thrust speeds, so that they cover different thrust paths in the same time span. The aperture blade 1 is deformed equally and regularly within its elastic deformability, without anywhere excessive bending stresses arise. There are no kinks.

Es sind auch Ausführungen denkbar, bei denen die die Stellelemente 2 antreibenden Stellmotoren 5 hydraulische oder pneumatische Zylinder/Kolben-Systeme darstellen oder auf der Wirkung von piezo-elektrischen Kräften beruhen.Designs are also conceivable in which the servomotors 5 driving the actuating elements 2 represent hydraulic or pneumatic cylinder / piston systems or are based on the action of piezoelectric forces.

Wie für den Fachmann verständlich, ist der vorgeschlagene Einstellvorgang und die Vorrichtung zum Einstellen einer Blendenklinge mit bekannten elektronischen Mitteln steuerbar und programmierbar.As can be understood by the person skilled in the art, the proposed setting process and the device for setting an aperture blade can be controlled and programmed using known electronic means.

Claims (2)

  1. A device for adjusting a slice bar (1) at the delivery gap of a headbox of a paper-making machine with drivable positioning elements (2) which are located at suitable intervals parallel to the slice bar (1) and are connected thereto in order to introduce a force to the slice bar (1) at the points of connection (3), the positioning elements (2) being spindles (2) which are supported on a rigid, fixed support (4) and servomotors (5) being provided for driving said elements,
    characterised in that for the servomotors (5) on each individual one the desired rate of advance (v) and the desired sliding path (6) for the positioning element (2) in each case can be set before the servomotor (5) starts, and that all the servomotors (5) can be started simultaneously, and can be switched off simultaneously once the desired position of the slice bar has been reached.
  2. A device according to Claim 1, characterised in that the servomotors (5) are electric stepping motors for which the number of steps and the frequency thereof can be set for the time interval of a setting operation, all the servomotors (5) being able to be operated jointly during a setting operation and simultaneously during the time interval.
EP88121062A 1988-03-11 1988-12-16 Device for positioning the slice bar Expired - Lifetime EP0331812B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88121062T ATE77857T1 (en) 1988-03-11 1988-12-16 DEVICE FOR ADJUSTING A SHUTTER BLADE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808050 1988-03-11
DE3808050A DE3808050A1 (en) 1988-03-11 1988-03-11 DEVICE FOR ADJUSTING A BLADE BLADE

Publications (2)

Publication Number Publication Date
EP0331812A1 EP0331812A1 (en) 1989-09-13
EP0331812B1 true EP0331812B1 (en) 1992-07-01

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ID=6349427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121062A Expired - Lifetime EP0331812B1 (en) 1988-03-11 1988-12-16 Device for positioning the slice bar

Country Status (5)

Country Link
US (1) US4915789A (en)
EP (1) EP0331812B1 (en)
AT (1) ATE77857T1 (en)
DE (1) DE3808050A1 (en)
FI (1) FI88183C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4025874A1 (en) * 1990-08-16 1992-02-20 Escher Wyss Gmbh Stock inlet adjustment - monitors effect of each setting command to give automatic operation
US5035773A (en) * 1990-10-04 1991-07-30 E. I. Du Pont De Nemours And Company Headbox with concave auxiliary blade
DE19723860A1 (en) * 1997-06-06 1998-12-10 Voith Sulzer Papiermasch Gmbh Stock inlet
DE29713272U1 (en) * 1997-07-25 1997-11-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Headbox to form a fiber suspension layer
DE102005060715A1 (en) * 2005-12-19 2007-06-21 Siemens Ag Paper machine with one or more valve devices

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463701A (en) * 1966-09-26 1969-08-26 Allis Chalmers Mfg Co Remote controlled headbox slice
CA1303706C (en) * 1985-01-22 1992-06-16 Gurcan Aral System and process for controlling the formation of sheet material
IT1184790B (en) * 1985-05-15 1987-10-28 O M I P A Italia Di Cazzani Gi FLAT EXTRUSION HEAD FOR STRATIFORM PLASTIC MATERIAL
DE3535849A1 (en) * 1985-10-08 1987-04-09 Voith Gmbh J M Setting device for the lip of a papermachine hatbox
CA1272055A (en) * 1986-01-24 1990-07-31 Richard Stewart Mcdiarmid Air motor - harmonic drive slice lip automation system
US4726883A (en) * 1987-04-27 1988-02-23 Beloit Corporation Apparatus for selectively moving the slice lip of a headbox

Also Published As

Publication number Publication date
DE3808050A1 (en) 1989-09-21
FI88183C (en) 1993-04-13
FI88183B (en) 1992-12-31
ATE77857T1 (en) 1992-07-15
US4915789A (en) 1990-04-10
FI890651A (en) 1989-09-12
DE3808050C2 (en) 1989-12-14
FI890651A0 (en) 1989-02-10
EP0331812A1 (en) 1989-09-13

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