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EP0587829B1 - Draft regulating process and device for drawing frames - Google Patents

Draft regulating process and device for drawing frames Download PDF

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Publication number
EP0587829B1
EP0587829B1 EP93903777A EP93903777A EP0587829B1 EP 0587829 B1 EP0587829 B1 EP 0587829B1 EP 93903777 A EP93903777 A EP 93903777A EP 93903777 A EP93903777 A EP 93903777A EP 0587829 B1 EP0587829 B1 EP 0587829B1
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EP
European Patent Office
Prior art keywords
speed
unit
motor
draw
sliver
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.)
Revoked
Application number
EP93903777A
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German (de)
French (fr)
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EP0587829A1 (en
Inventor
Hansjörg RUTZ
François BAECHLER
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Zellweger Luwa AG
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Zellweger Luwa AG
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H5/00Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/32Regulating or varying draft

Definitions

  • the present invention relates to a method according to the preamble of patent claim 1 and a device according to the preamble of patent claim 8.
  • CH-A-650 280 describes a line which has a separate drive motor for each pair of rollers, the speed of which can be set by a frequency divider.
  • a computer containing an input device and a display device calculates the speed ratios for the motors in accordance with the input data and adjusts the distance accordingly.
  • the computer can also be assigned a measuring device for the fineness of the sliver, from whose measuring signal an unevenness signal characterizing the unevenness of the sliver can be derived.
  • DE-A-41 03 525 shows a device for drawing fiber slivers, in which a fiber sliver is guided and stretched by pairs of rollers, each of which is obtained directly from a motor driven roller and consist of a moving pressure roller driven over the sliver.
  • a speed sensor is arranged on each pressure roller and connected to a control and regulating device.
  • the motors for the directly driven rollers are controlled by the control and regulating device.
  • errors or deviations that are justified in the drive system of the rollers themselves are only recorded via their effects on the sliver and thus, if at all, with a time delay.
  • the invention is now to specify a draft regulation which enables a quick reaction to fluctuations in draft, in which the necessary corrections are as simple as possible, and which enables operation to be as drift-free as possible.
  • the method according to the invention is based on the forward compensation, which is also referred to as the setpoint feedforward control.
  • the forward compensation which is also referred to as the setpoint feedforward control.
  • the system is independent of drift. The system has no overall drift because any drift in individual components is corrected for.
  • the invention further relates to a device for regulating the draft of a drafting system with roller pairs and drive motors assigned to the roller pairs, with a control unit for setting the distance, with means for measuring the belt speed via the rotational speeds of driven roller pairs which are connected to the control unit, in which the measured belt speeds are evaluated,
  • the device according to the invention is characterized by a constant warping field and a variable warping field to which two drive motors (5, 6) are assigned, by first and second means (12, 13) for measuring the belt speed at the infeed and outfeed of the drafting system and by a control motor (5) as one of the two drive motors of the variable delay field, which is controlled by the control unit.
  • a drafting device of a two-headed section for duplicating or drawing fiber slivers is shown, to which two groups of fiber slivers are fed in the direction of arrows VI and which delivers two fiber slivers at its output (arrows VA).
  • the arrangement of two deliveries is not essential to the invention and the invention is not limited to routes of this type.
  • the drafting system 1 consists, as shown, of three pairs of rollers 2, 3 and 4, a preliminary draft field VV being formed between the front pairs of rollers 2 and 3 in the direction of travel of the fiber slivers (arrows VA and VI), and a main drafting zone HV being formed between the rear pairs of rollers 3 and 4 in the direction of advance is.
  • a drive motor 5 or 6 is assigned to both the pre-delay field VV and the main delay field HV.
  • the drive motor 5 for the pre-drafting field VV drives one of its two pairs of rollers, according to the illustration the pair of rollers 2 at the inlet, directly, which in turn is mechanically coupled to the other pair of rollers 3 and drives this in an adjustable transmission ratio.
  • the drive motor 6 for the main draft zone HV drives the pair of rollers 4 directly at the outlet, which is coupled to a pair of delivery rollers 7. There is therefore no mechanical coupling between the two fields of warpage, since both are driven by their own motor.
  • the two motors 5 for the roller pairs 2 and 3 are control motors and the motor 6 for the roller pair 4 is a main motor.
  • the latter regulates the exact production speed of the system via its speed, whereas the speed at which the fiber slivers enter the drafting system 1 is dependent on the speed of the control motors 5.
  • the delay is dependent on the speed of the control motors 5.
  • the speeds of the two control motors 5 can be controlled independently of one another; thus 7 different delays can be set on the two deliveries at the same delivery speed by the delivery rollers.
  • Corresponding servo amplifiers 8 are assigned to all motors, which have their own speed and current regulation.
  • all motors 5 and 6 are controlled by a common control unit RE, to which an input / display unit 9 is assigned.
  • the control unit RE contains a controller 10 for each of the two lines, which controls the speed of its control motor 5 via a fast control path and regulates it via a slow control path.
  • the control unit receives signals that are representative of the tape number management from measuring devices, not shown, of the type described in EP-B-0 252 952, and uses these signals to generate distortion correction values KB1 and KB2 for the tape number management, which are used in the control path. In addition to these distortion correction values KB1 and KB2, no further measured values are used in the control path, but only parameters that are partly entered via the input / display unit 9 and partly calculated in the control unit RE.
  • the controllers 10 are so-called I controllers for the regulating path (the output variable is proportional to the time integral of the input variable) and P controller for the control path (the output variable is proportional to the input variable at all times). They have the task of warping deviations, malfunctions in the drafting system, non-linearities of the actuators, temperature drift, to correct mechanical play and slip.
  • the current delay is calculated using the effective infeed speed VIi and the effective delivery speed VAi.
  • a comparison of the current and the desired warpage provides the warpage deviation, from which the controller 10 calculates a warpage correction value, which is then fed into the control path.
  • the calculation of a delay correction value is carried out within an abbat cycle; the speed at which a delay error is corrected in this control loop depends on the integration time of the I controller 10, on the sampling time and on the response time of the actuators (loaded motor 5 and servo amplifier 8).
  • the effective inlet speed VIi and the effective delivery speed VAi are measured by speed sensors 12 on the inlet roller pairs 2 and by a speed sensor 13 on the delivery roller pair 7, the signals of which are evaluated via a special interface.
  • the roller diameter, the nominal speed of the motors, the parameters of the speed sensors (eg speedometer wheel, correction factor) and the various controller parameters must be entered via the input / display unit 9.
  • the delivery speed VAs and the total delay ND can be changed via the input / display unit 9.
  • Fig. 2 shows the structure of a complete control system in a schematic longitudinal section through the drafting system.
  • a sliver F is pulled out from the supply cans 14, of which six or eight pieces are provided, for example, by means of a pair of rollers 15.
  • the fiber slivers F then run through a template measuring unit 16 for the sliver control, which according to the illustration is formed by a so-called groove and feeler roller measuring element 17 (see, for example, US Pat. No. 3,938,223) and, in addition to the actual measuring element 17, a displacement sensor 18 for has its evaluation.
  • the slivers F then enter the drafting unit 1 with the pairs of rollers 2, 3 and 4 and receive a constant pre-draft in the pre-draft field VV and a variable main draft in the main draft field HV.
  • the speed sensor 12 for measuring the effective inlet speed VIi (FIG. 1) is designed as a tachometer.
  • the time delay for the control controller is determined in the control unit RE as a function of the running-in speed VIi and from various distances (distance between measuring element / drafting system, roller distances).
  • a measuring element 19 for quality monitoring of the strip produced which is preferably formed by a so-called fiber press measuring funnel of the type described in EP-A-252 952.
  • a preamplifier 20 and on the other hand a cleaning unit 21 is assigned, from which compressed air 22 is fed to the measuring element 19 for cleaning and cooling.
  • the cleaning unit 21 contains a controlled 3-way valve 23 and a by-pass 24 for cooling. The cooling therefore takes place continuously and the cleaning sporadically, the 3-way valve 23 being controlled by the control unit RE.
  • the belt runs through the pair of delivery rollers 7, the speed sensor 13 of which is also designed as a tachometer. This measures the delivery speed of the produced strip, from which the production data are determined in the control unit RE.
  • the strip arrives in a storage can 25 arranged on a driven turntable, at the inlet of which a likewise driven head plate 26 is arranged.
  • control unit RE also has an interface 31 to a control cabinet 32 for the machine, which is used in particular for shutdown, alarm display, regulatory approval, can change control and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Control Of Multiple Motors (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Friction Gearing (AREA)

Abstract

A drawing frame (1) has to drawing fields (VV, HV), of which the variable one (HV) is driven by two motors (5, 6). The desired draft is set by controlling the speed of rotation of one of the motors, preferably the motor (5) for the pre-drawing field (VV). The speed of rotation is controlled on the basis of a draft correction value derived from the deviation between the desired set draft and the real draft calculated from the speed of the sliver (F) at the input and output of the drawing frame. This draft regulation makes it possible to react quickly to draft fluctuations, to apply simple corrective measures and to operate the drawing frame without drifts.

Description

Die vorliegende Erfindung betrifft ein Verfahren gemäss dem Oberbegriff des Patentanspruchs 1 und eine Vorrichtung gemäss dem Oberbegriff des Patentanspruchs 8.The present invention relates to a method according to the preamble of patent claim 1 and a device according to the preamble of patent claim 8.

In der CH-A-650 280 ist eine Strecke beschrieben, die für jedes Walzenpaar einen separaten Antriebsmotor aufweist, dessen Drehzahl durch einen Frequenzteiler einstellbar ist. Ein eine Eingabe- und eine Anzeigevorrichtung enthaltender Rechner errechnet nach Massgabe der eingegebenen Daten die Drehzahlverhältnisse für die Motoren und stellt die Strecke entsprechend ein. Dem Rechner kann auch ein Messorgan für die Feinheit des Faserbandes zugeordnet sein, aus dessen Messignal ein die Ungleichmässigkeit des Faserbandes charakterisierendes Ungleich-mässigkeitssignal ableitbar ist.CH-A-650 280 describes a line which has a separate drive motor for each pair of rollers, the speed of which can be set by a frequency divider. A computer containing an input device and a display device calculates the speed ratios for the motors in accordance with the input data and adjusts the distance accordingly. The computer can also be assigned a measuring device for the fineness of the sliver, from whose measuring signal an unevenness signal characterizing the unevenness of the sliver can be derived.

Wenn bei dieser Strecke Abweichungen des Verzugs von den eingegebenen Werten auftreten, dann lassen sich diese nur indirekt über ihre Auswirkungen auf die Ungleichmässigkeit des Faserbandes erkennen. Diese Art von Verzugsregulierung über das Faserband stellt eine sogenannte Langzeitregulierung dar, die wegen ihrer Trägheit den praktischen Anforderungen an eine Verzugsregulierung nicht zu genügen vermag. Dazu kommt noch, dass sich die Verzugsabweichungen erst bei Ueberschreiten einer gewissen Grösse als Bandungleichmässigkeit bemerkbar machen, so dass insbesondere eine Drift des ganzen Systems über die Bandungleichmässigkeit nur sehr schwer erkennbar ist.If there are deviations of the warp from the entered values on this stretch, these can only be recognized indirectly via their effects on the unevenness of the sliver. This type of warp regulation via the sliver represents a so-called long-term regulation, which due to its inertia cannot meet the practical requirements for warp regulation. Additional to that, that the warping deviations only become noticeable as band unevenness when a certain size is exceeded, so that in particular a drift of the entire system over the band unevenness is very difficult to detect.

Der der Erfindung am nächsten kommende Stand der Technik ist aus der DE-A-41 03 525 zu entnehmen, die eine Vorrichtung zum Verziehen von Faserbändern zeigt, bei der ein Faserband durch Walzenpaare geführt und gestreckt wird, die je aus einer durch einen Motor direkt angetriebenen Walze und aus einer über das Faserband angetriebenen, mitlaufenden Druckwalze bestehen. Ein Drehzahlsensor ist an jeder Druckwalze angeordnet und mit einer Steuer- und Regeleinrichtung verbunden. Die Motoren für die direkt angetriebenen Walzen werden von der Steuer- und Regeleinrichtung angesteuert. Damit ergibt sich eine Regelschleife, in die auch das Faserband einbezogen ist und die beispielsweise auch den Schlupf zwischen dem Faserband und den Walzen erfasst. Damit werden aber Fehler oder Abweichungen, die im Antriebssystem der Walzen selbst begründet sind, erst über ihre Auswirkungen auf das Faserband und damit, wenn überhaupt, mit zeitlichem Verzug erfasst.The closest prior art to the invention can be found in DE-A-41 03 525, which shows a device for drawing fiber slivers, in which a fiber sliver is guided and stretched by pairs of rollers, each of which is obtained directly from a motor driven roller and consist of a moving pressure roller driven over the sliver. A speed sensor is arranged on each pressure roller and connected to a control and regulating device. The motors for the directly driven rollers are controlled by the control and regulating device. This results in a control loop in which the sliver is also included and which, for example, also detects the slippage between the sliver and the rollers. However, errors or deviations that are justified in the drive system of the rollers themselves are only recorded via their effects on the sliver and thus, if at all, with a time delay.

Durch die Erfindung soll nun eine Verzugsregulierung angegeben werden, die ein rasches Reagieren auf Verzugsschwankungen ermöglicht, bei der die erforderlichen Korrekturen möglichst einfach vorzunehmen sind, und welche einen möglichst driftfreien Betrieb ermöglicht.The invention is now to specify a draft regulation which enables a quick reaction to fluctuations in draft, in which the necessary corrections are as simple as possible, and which enables operation to be as drift-free as possible.

Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art durch die folgenden Schritte gelöst:

  • a. Messung der Drehgeschwindigkeit eines Walzenpaares am Einlauf in das Streckwerk;
  • b. Messung der Drehgeschwindigkeit eine Walzenpaares am Auslauf aus dem Streckwerk;
  • c. Berechnung des Ist-Verzugs aus den genannten Messungen;
  • d. Vergleich des Ist-Verzugs mit dem Soll-Verzug und Bestimmung der Abweichung zwischen diesen;
  • e. Berechnung eines Verzugskorrekturwertes aus dieser Abweichung;
  • f. Ueberlagerung des Verzugskorrekturwertes mit der nominalen Steuergrösse; und
  • g. Regelung der Drehzahl eines der Motoren mittels der berechneten Grösse.
In a method of the type mentioned at the outset, this task is solved by the following steps:
  • a. Measurement of the speed of rotation of a pair of rollers at the inlet to the drafting system;
  • b. Measuring the speed of rotation of a pair of rollers at the outlet from the drafting system;
  • c. Calculation of the actual delay from the measurements mentioned;
  • d. Comparison of the actual delay with the target delay and determination of the deviation between them;
  • e. Calculation of a delay correction value from this deviation;
  • f. Superimposition of the delay correction value with the nominal tax variable; and
  • G. Regulation of the speed of one of the motors using the calculated size.

Das erfindungsgemässe Verfahren basiert auf der Vorwärtskompensation, die auch als Sollgrössenaufschaltung bezeichnet wird. Es zeichnet sich neben dem raschen Reagieren auf Verzugsschwankungen und der Möglichkeit der einfachen Vornahme von Korrekturen insbesondere dadurch aus, dass das System driftunabhängig ist. Das System weist nämlich keine Gesamtdrift auf, weil eine eventuelle Drift einzelner Komponenten auskorrigiert wird.The method according to the invention is based on the forward compensation, which is also referred to as the setpoint feedforward control. In addition to reacting quickly to fluctuations in delay and being able to make corrections easily, it is characterized in particular by the fact that the system is independent of drift. The system has no overall drift because any drift in individual components is corrected for.

Die Erfindung betrifft weiter eine Vorrichtung zur Regulierung des Verzugs eines Streckwerkes mit Walzenpaaren und mit den Walzenpaaren zugeordneten Antriebsmotoren, mit einer Regeleinheit für die Einstellung der Strecke, mit Mitteln zur Messung der Bandgeschwindigkeit über die Drehgeschwindigkeiten von angetriebenen Walzenpaaren, die mit der Regeleinheit verbunden sind, in welcher eine Auswertung der gemessenen Bandgeschwindigkeiten erfolgt,The invention further relates to a device for regulating the draft of a drafting system with roller pairs and drive motors assigned to the roller pairs, with a control unit for setting the distance, with means for measuring the belt speed via the rotational speeds of driven roller pairs which are connected to the control unit, in which the measured belt speeds are evaluated,

Die erfindungsgemässe Vorrichtung ist gekennzeichnet durch, ein konstantes Verzugsfeld und ein variables Verzugsfeld denen zwei Antriebsmotore (5, 6) zugeordnet sind, durch erste und zweite Mittel (12, 13) zur Messung der Bandgeschwindigkeit am Einlauf und am Auslauf des Streckwerkes und durch einen Regelmotor (5) als einen der beiden Antriebsmotore des variablen Verzugsfeldes, der von der Regeleinheit gesteuert ist.The device according to the invention is characterized by a constant warping field and a variable warping field to which two drive motors (5, 6) are assigned, by first and second means (12, 13) for measuring the belt speed at the infeed and outfeed of the drafting system and by a control motor (5) as one of the two drive motors of the variable delay field, which is controlled by the control unit.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen und der Zeichnungen näher erläutert; es zeigt:

Fig. 1
ein Prinzip-Schema einer erfindungsgemässen Verzugsregulierung einer Strecke; und
Fig. 2
ein Schema einer Strecke mit einer erfindungsgemässen Verzugsregulierung und Bandregulierungssteuerung in einer anderen Darstellung als in Fig. 1.
The invention is explained in more detail below with the aid of exemplary embodiments and the drawings; it shows:
Fig. 1
a schematic diagram of a delay regulation of a route according to the invention; and
Fig. 2
1 shows a diagram of a route with a draft regulation and band regulation control according to the invention in a different representation than in FIG. 1.

In Fig. 1 ist ein Streckwerk einer zweiköpfigen Strecke zum Dublieren oder Verziehen von Faserbändern dargestellt, dem zwei Gruppen von Faserbändern in Richtung der Pfeile VI zugeführt werden und das an seinem Ausgang (Pfeile VA) zwei Faserbänder liefert. Die Anordnung von zwei Ablieferungen ist aber für die Erfindung nicht wesentlich und die Erfindung ist auch nicht auf Strecken dieser Art beschränkt.In Fig. 1, a drafting device of a two-headed section for duplicating or drawing fiber slivers is shown, to which two groups of fiber slivers are fed in the direction of arrows VI and which delivers two fiber slivers at its output (arrows VA). The arrangement of two deliveries is not essential to the invention and the invention is not limited to routes of this type.

Das Streckwerk 1 besteht darstellungsgemäss aus drei Walzenpaaren 2, 3 und 4, wobei zwischen den in der Durchlaufrichtung der Faserbänder (Pfeile VA und VI) vorderen Walzenpaaren 2 und 3 ein Vorverzugsfeld VV und zwischen den in Durchlaufrichtung hinteren Walzenpaaren 3 und 4 ein Hauptverzugsfeld HV gebildet ist. Sowohl dem Vorverzugsfeld VV als auch dem Hauptverzugsfeld HV ist ein Antriebsmotor 5 beziehungsweise 6 zugeordnet.The drafting system 1 consists, as shown, of three pairs of rollers 2, 3 and 4, a preliminary draft field VV being formed between the front pairs of rollers 2 and 3 in the direction of travel of the fiber slivers (arrows VA and VI), and a main drafting zone HV being formed between the rear pairs of rollers 3 and 4 in the direction of advance is. A drive motor 5 or 6 is assigned to both the pre-delay field VV and the main delay field HV.

Der Antriebsmotor 5 für das Vorverzugsfeld VV treibt eines von dessen beiden Walzenpaaren, darstellungsgemäss das Walzenpaar 2 am Einlauf, direkt an, welches seinerseits mit dem anderen Walzenpaar 3 mechanisch gekoppelt ist und dieses in einem einstellbaren Uebersetzungsverhältnis antreibt. Der Antriebsmotor 6 für das Hauptverzugsfeld HV treibt das Walzenpaar 4 am Auslauf direkt an, das mit einem Lieferwalzenpaar 7 gekoppelt ist. Somit besteht zwischen den beiden Verzugsfeldern keine mechanische Kopplung, da beide mit einem eigenen Motor angetrieben sind.The drive motor 5 for the pre-drafting field VV drives one of its two pairs of rollers, according to the illustration the pair of rollers 2 at the inlet, directly, which in turn is mechanically coupled to the other pair of rollers 3 and drives this in an adjustable transmission ratio. The drive motor 6 for the main draft zone HV drives the pair of rollers 4 directly at the outlet, which is coupled to a pair of delivery rollers 7. There is therefore no mechanical coupling between the two fields of warpage, since both are driven by their own motor.

Die beiden Motoren 5 für die Walzenpaare 2 und 3 sind Regelmotoren und der Motor 6 für das Walzenpaar 4 ist ein Hauptmotor. Letzterer reguliert über seine Drehzahl die exakte Produktionsgeschwindigkeit des Systems, wogegen die Einlaufgeschwindigkeit der Faserbänder in das Streckwerk 1 von den Drehzahlen der Regelmotoren 5 abhängig ist. Somit ist bei gegebener Drehzahl des Hauptmotors 6 der Verzug von der Drehzahl der Regelmotoren 5 abhängig. Die Drehzahlen der beiden Regelmotoren 5 sind unabhängig voneinander regelbar; somit können an den beiden Ablieferungen bei gleicher Abliefergeschwindigkeit durch die Lieferwalzen 7 verschiedene Verzüge eingestellt werden. Allen Motoren sind entsprechende Servoverstärker 8 zugeordnet, die eine eigene Drehzahl- und Stromregulierung aufweisen. Ausserdem sind alle Motoren 5 und 6 von einer gemeinsamen Regeleinheit RE angesteuert, welcher eine Eingabe/Anzeige-Einheit 9 zugeordnet ist.The two motors 5 for the roller pairs 2 and 3 are control motors and the motor 6 for the roller pair 4 is a main motor. The latter regulates the exact production speed of the system via its speed, whereas the speed at which the fiber slivers enter the drafting system 1 is dependent on the speed of the control motors 5. Thus, for a given speed of the main motor 6, the delay is dependent on the speed of the control motors 5. The speeds of the two control motors 5 can be controlled independently of one another; thus 7 different delays can be set on the two deliveries at the same delivery speed by the delivery rollers. Corresponding servo amplifiers 8 are assigned to all motors, which have their own speed and current regulation. In addition, all motors 5 and 6 are controlled by a common control unit RE, to which an input / display unit 9 is assigned.

Die Regeleinheit RE enthält für jede der beiden Strecken einen Regler 10, der die Drehzahl seines Regelmotors 5 über einen schnellen Steuerpfad steuert und über einen langsamen Regelpfad regelt. Von nicht dargestellten Messorganen der in der EP-B-0 252 952 beschriebenen Art erhält die Regeleinheit Signale, welche für die Bandnummernhaltung repräsentativ sind, und erzeugt aus diesen Signalen Verzugskorrekturwerte KB1 und KB2 für die Bandnummernhaltung, welche im Steuerpfad verwendet werden. Ausser diesen Verzugskorrekturwerten KB1 und KB2 werden im Steuerpfad keine weiteren Messwerte, sondern nur noch Parameter verwendet, die teilweise über die Eingabe/Anzeigeeinheit 9 eingegeben und teilweise in der Regeleinheit RE berechnet werden. Diese Parameter sind die einem Generator 14 vorgegebene Liefergeschwindigkeit VAs und der Totalverzug ND1 bzw. ND2, aus denen zusammen mit den Verzugskorrekturwerten KB1 und KB2 die jeweilige Einlaufgeschwindigkeit VI berechnet wird. Die Berechnung und die Ausgabe dieser Werte in entsprechenden, den Servoverstärkern 8 vorgeschalteten, Ausgabestufen 11 erfolgt innerhalb eines Abtastzyklus.The control unit RE contains a controller 10 for each of the two lines, which controls the speed of its control motor 5 via a fast control path and regulates it via a slow control path. The control unit receives signals that are representative of the tape number management from measuring devices, not shown, of the type described in EP-B-0 252 952, and uses these signals to generate distortion correction values KB1 and KB2 for the tape number management, which are used in the control path. In addition to these distortion correction values KB1 and KB2, no further measured values are used in the control path, but only parameters that are partly entered via the input / display unit 9 and partly calculated in the control unit RE. These parameters are the delivery speed VAs given to a generator 14 and the total delay ND1 or ND2, from which the respective running-in speed VI is calculated together with the delay correction values KB1 and KB2. The calculation and the output of these values in corresponding output stages 11 connected upstream of the servo amplifiers 8 takes place within one sampling cycle.

Die Regler 10 sind für den Regulierpfad sogenannte I-Regler (die Ausgangsgrösse ist proportional dem Zeitintegral der Eingangsgrösse) und für den Steuerpfad P-Regler (die Ausgangsgrösse ist zu allen Zeiten proportional der Eingangsgrösse). Sie haben die Aufgabe, Verzugsabweichungen, Störungen im Streckwerk, Unlinearitäten der Stellglieder, Temperaturdrift, mechanisches Spiel und Schlupf auszuregeln. Mittels der effektiven Einlaufgeschwindigkeit VIi und der effektiven Liefergeschwindigkeit VAi wird der aktuelle Verzug berechnet. Ein Vergleich von aktuellem und gewünschtem Verzug liefert die Verzugsabweichung, aus welcher der Regler 10 einen Verzugskorrekturwert berechnet, der dann in den Steuerpfad eingespeist wird. Die Berechnung eines Verzugskorrekturwertes erfolgt innerhalb eines Abtatszyklus; die Geschwindigkeit, mit der ein Verzugsfehler in dieser Regelschleife auskorrigiert wird, ist abhängig von der Integrationszeit des I-Reglers 10, von der Abtastzeit und von der Reaktionszeit der Stellglieder (belasteter Motor 5 und Servoverstärker 8).The controllers 10 are so-called I controllers for the regulating path (the output variable is proportional to the time integral of the input variable) and P controller for the control path (the output variable is proportional to the input variable at all times). They have the task of warping deviations, malfunctions in the drafting system, non-linearities of the actuators, temperature drift, to correct mechanical play and slip. The current delay is calculated using the effective infeed speed VIi and the effective delivery speed VAi. A comparison of the current and the desired warpage provides the warpage deviation, from which the controller 10 calculates a warpage correction value, which is then fed into the control path. The calculation of a delay correction value is carried out within an abbat cycle; the speed at which a delay error is corrected in this control loop depends on the integration time of the I controller 10, on the sampling time and on the response time of the actuators (loaded motor 5 and servo amplifier 8).

Die Messung der effektiven Einlaufgeschwindigkeit VIi und der effektiven Liefergeschwindigkeit VAi erfolgt durch Drehzahl-Sensoren 12 an den Einlauf-Walzenpaaren 2 und durch einen Drehzahl-Sensor 13 am Lieferwalzenpaar 7, deren Signale über ein Spezialinterface ausgewertet werden.The effective inlet speed VIi and the effective delivery speed VAi are measured by speed sensors 12 on the inlet roller pairs 2 and by a speed sensor 13 on the delivery roller pair 7, the signals of which are evaluated via a special interface.

Für die Verzugsregulierung müssen über die Eingabe/Anzeige-Einheit 9 die Walzendurchmesser, die Nenndrehzahlen der Motoren, die Parameter der Drehzahlsensoren (z.B. Tachorad, Korrekturfaktor) und die verschiedenen Regler-Parameter eingegeben werden. Die Liefergeschwindigkeit VAs und der Totalverzug ND können über die Eingabe/Anzeige-Einheit 9 verändert werden.For the warp regulation, the roller diameter, the nominal speed of the motors, the parameters of the speed sensors (eg speedometer wheel, correction factor) and the various controller parameters must be entered via the input / display unit 9. The delivery speed VAs and the total delay ND can be changed via the input / display unit 9.

Fig. 2 zeigt den Aufbau eines vollständigen Reguliersystems in einem schematischen Längsschnitt durch das Streckwerk. Darstellungsgemäss wird aus den Vorlagekannen 14, von denen beispielsweise sechs oder acht Stück vorgesehen sind, je ein Faserband F mittels eines Walzenpaares 15 herausgezogen. Die Faserbänder F laufen dann durch eine Vorlage-Messeinheit 16 für die Bandsteuerung, welche darstellungsgemäss durch ein sogenanntes Nut- und Tastwalzenmessorgan 17 (siehe dazu beispielsweise die US-A-3 938 223) gebildet ist und neben dem eigentlichen Messorgan 17 einen Wegaufnehmer 18 für dessen Auswertung aufweist.Fig. 2 shows the structure of a complete control system in a schematic longitudinal section through the drafting system. According to the illustration, a sliver F is pulled out from the supply cans 14, of which six or eight pieces are provided, for example, by means of a pair of rollers 15. The fiber slivers F then run through a template measuring unit 16 for the sliver control, which according to the illustration is formed by a so-called groove and feeler roller measuring element 17 (see, for example, US Pat. No. 3,938,223) and, in addition to the actual measuring element 17, a displacement sensor 18 for has its evaluation.

Anschliessend gelangen die Faserbänder F in das Streckwerk 1 mit den Walzenpaaren 2, 3 und 4 und erhalten im Vorverzugsfeld VV einen konstanten Vorverzug und im Hauptverzugsfeld HV einen variablen Hauptverzug. Der Drehzahl-Sensor 12 zur Messung der effektiven Einlaufgeschwindigkeit VIi (Fig. 1) ist als Tachogeber ausgebildet. Die Zeitverzögerung für den Steuerregler wird in der Regeleinheit RE in Funktion der Einlaufgeschwindigkeit VIi und von diversen Abständen (Abstand Messorgan/ Streckwerk, Walzenabstände) bestimmt.The slivers F then enter the drafting unit 1 with the pairs of rollers 2, 3 and 4 and receive a constant pre-draft in the pre-draft field VV and a variable main draft in the main draft field HV. The speed sensor 12 for measuring the effective inlet speed VIi (FIG. 1) is designed as a tachometer. The time delay for the control controller is determined in the control unit RE as a function of the running-in speed VIi and from various distances (distance between measuring element / drafting system, roller distances).

Am Ausgang des Streckwerks 1 ist ein Messorgan 19 für die Qualitätsüberwachung des produzierten Bandes angeordnet, welches vorzugsweise durch einen sogenannten Faserpress-Messtrichter der in der EP-A-252 952 beschriebenen Art gebildet ist. Diesem ist einerseits ein Vorverstärker 20 und andererseits eine Reinigungseinheit 21 zugeordnet, von welcher dem Messorgan 19 Pressluft 22 für Reinigung und Kühlung zugeführt wird. Die Reinigungseinheit 21 enthält ein gesteuertes 3-Weg-Ventil 23 und einen By-Pass 24 für die Kühlung. Die Kühlung erfolgt also ständig und die Reinigung sporadisch, wobei die Steuerung des 3-Weg-Ventils 23 durch die Regeleinheit RE erfolgt.At the exit of the drafting device 1 there is a measuring element 19 for quality monitoring of the strip produced, which is preferably formed by a so-called fiber press measuring funnel of the type described in EP-A-252 952. This on the one hand a preamplifier 20 and on the other hand a cleaning unit 21 is assigned, from which compressed air 22 is fed to the measuring element 19 for cleaning and cooling. The cleaning unit 21 contains a controlled 3-way valve 23 and a by-pass 24 for cooling. The cooling therefore takes place continuously and the cleaning sporadically, the 3-way valve 23 being controlled by the control unit RE.

Anschliessend an das Messorgan 19 durchläuft das Band das Lieferwalzenpaar 7, dessen Drehzahl-Sensor 13 ebenfalls als Tachogeber ausgebildet ist. Dieser misst die Liefergeschwindigkeit des produzierten Bandes, woraus in der Regeleinheit RE die Produktionsdaten bestimmt werden. Im Anschluss an das Lieferwalzenpaar 7 gelangt das Band in eine auf einem angetriebenen Drehteller angeordnete Ablagekanne 25, an deren Einlauf ein ebenfalls angetriebener Kopfteller 26 angeordnet ist.Following the measuring element 19, the belt runs through the pair of delivery rollers 7, the speed sensor 13 of which is also designed as a tachometer. This measures the delivery speed of the produced strip, from which the production data are determined in the control unit RE. Following the pair of delivery rollers 7, the strip arrives in a storage can 25 arranged on a driven turntable, at the inlet of which a likewise driven head plate 26 is arranged.

Weiter sind in der Figur der Hauptmotor 6 und der Regelmotor 5 der Regulierstrecke und eine Leistungseinheit 27 eingezeichnet, welche die Servoverstärker 8 für die genannten Motoren sowie einen Netzteil 28 mit Ballast steuerung für den Hauptmotor 6 aufweist. Mit dem Bezugszeichen 29 ist ein Ballastwiderstand für den Hauptmotor 6 und mit 30 ist ein 3-Phasen-Transformator für die Leistungseinheit 27 bezeichnet. Neben der Verbindung zur Eingabe/Anzeige-Einheit 9 weist die Regeleinheit RE noch eine Schnittstelle 31 zu einem Schaltschrank 32 für die Maschine auf, welche insbesondere für Abstellung, Alarmanzeige, Regulierungsfreigabe, Kannenwechsel-Steuerung und dergleichen dient.Also shown in the figure are the main motor 6 and the control motor 5 of the regulating path and a power unit 27 which has the servo amplifier 8 for the motors mentioned and a power supply 28 with ballast control for the main motor 6. The reference numeral 29 denotes a ballast resistor for the main motor 6 and 30 denotes a 3-phase transformer for the power unit 27. In addition to the connection to the input / display unit 9, the control unit RE also has an interface 31 to a control cabinet 32 for the machine, which is used in particular for shutdown, alarm display, regulatory approval, can change control and the like.

Die dargestellte Verzugsregulierung kann für folgende Konzepte der Bandnummernregulierung eingesetzt werden:

  • Bandnummernregulierung im offenen Regelkreis
  • Bandnummernregulierung im geschlossenen Regelkreis
  • Bandnummernregulierung im offenen und geschlossenen Regelkreis
The delay regulation shown can be used for the following concepts of band number regulation:
  • Band number regulation in an open control loop
  • Volume number regulation in a closed control loop
  • Band number regulation in open and closed control loops

Diese Konzepte sind dem Fachmann bekannt und beispielsweise im USTER News Bulletin Nr. 30 vom Juni 1982 beschrieben.These concepts are known to the person skilled in the art and are described, for example, in USTER News Bulletin No. 30 of June 1982.

Claims (15)

  1. Method for regulating the draw of a drawing unit, in which each drawing zone (VV, HV) formed by pairs of rollers (2, 3, 4) is driven by a separate motor (5, 6), the desired draw is adjustable by means of a corresponding control of the speeds of the motors and a measurement of the rotational speed on driven pairs of rollers is carried out, characterized by the following steps:
    a. Measurement of the rotational speed of the pair of rollers at the entrance of the drawing unit;
    b. Measurement of the rotational speed of the pair of rollers at the exit of the drawing unit;
    c. Calculation of the actual draw from the said measurements;
    d. Comparison of the actual draw with the desired draw and determination of the deviation between these;
    e. Calculation of a draw correction value from this deviation;
    f. Superposition of the draw correction value with the nominal control quantity; and
    g. Regulation of the speed of one of the motors (5, 6) by means of the calculated quantity.
  2. Method according to Claim 1, in which the drawing unit has a predrawing zone and a main drawing zone, characterized in that the motor (5) of the predrawing zone (VV) is designed as a variable-speed motor and is regulated by means of the said draw correction value.
  3. Method according to Claim 2, characterized in that the motor (6) of the main drawing zone (HV) is designed as a main motor, and in that its speed is set by means of the desired production speed.
  4. Method according to Claim 2 or 3, characterized in that the entry speed (VI) of the sliver (F) into the drawing unit (1) is on the one hand controlled by way of a control path and on the other hand regulated by way of a regulating path by means of the speed of the variable-speed motor (5).
  5. Method according to Claim 4, characterized in that, to control the variable-speed motor (5) by way of the control path, the desired entry speed (VI) of the sliver (F) is calculated from the predetermined exit speed (VA) and from the desired total draw.
  6. Method according to Claim 5, characterized in that, to calculate the desired entry speed (VI) of the sliver (F), its count fluctuations (KB) at the entrance or the exit of the drawing unit (1) are also taken into account.
  7. Method according to Claim 4, characterized in that, to regulate the variable-speed motor (5) by way of the regulating path, the calculated draw correction value is input into the control path.
  8. Device for regulating the draw of a drawing unit with pairs of rollers (2, 3, 4) and with drive motors (5, 6) assigned to the pairs of rollers, with a regulating unit (10) for adjusting the drawing frame, with means (12, 13) for measuring the sliver speed via the rotational speeds of driven pairs of rollers which are connected to the regulating unit, in which an evaluation of the measured sliver speeds takes place, characterized by a constant drawing zone and a variable drawing zone, to which two drive motors (5, 6) are assigned, by first and second means (12, 13) for measuring the sliver speed at the entrance and at the exit of the drawing unit and by a variable-speed motor (5) as one of the two drive motors of the variable drawing zone, which motor is controlled by the regulating unit.
  9. Device according to Claim 8, characterized in that the drive motor (5) for the predrawing zone (VV) is designed as a variable-speed motor.
  10. Device according to Claim 9, characterized in that all the drive motors (5, 6) are controlled by the regulating unit (5) and have a servo-amplifier (8) for speed and current regulation.
  11. Device according to one of Claims 8 to 10, characterized in that the regulating unit (RE) has a computer, an integral-action controller (10) and an input/indicator unit (9) for the input of the data necessary for the draw regulation.
  12. Device according to Claim 11, characterized in that the first and second means (12, 13) for measuring the sliver speed are formed by tacho generators.
  13. Device according to Claim 11, characterized in that the drawing unit (1) is preceded by a feed measurement unit (16) having a measuring member (17) for measuring the sliver cross-section, and in that the signals of this measurement unit are fed to the regulating unit (RE).
  14. Device according to Claim 11, characterized in that a measuring member (19) for monitoring the quality of the sliver produced is arranged at the exit of the drawing unit (1), and in that the signals from this measuring member are fed to the regulating unit (RE).
  15. Device according to Claims 13 and 14, characterized in that the measuring member (17) at the entrance of the drawing unit (1) is formed by a so-called grooved- and tracer-roller measuring member, and the measuring member (19) at the exit of the drawing unit is formed by a so-called fibre-compression measuring funnel.
EP93903777A 1992-03-05 1993-02-26 Draft regulating process and device for drawing frames Revoked EP0587829B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH701/92 1992-03-05
CH701/92A CH685164A5 (en) 1992-03-05 1992-03-05 Method and apparatus for controlling the delay of a drafting.
PCT/CH1993/000049 WO1993018213A1 (en) 1992-03-05 1993-02-26 Draft regulating process and device for drawing frames

Publications (2)

Publication Number Publication Date
EP0587829A1 EP0587829A1 (en) 1994-03-23
EP0587829B1 true EP0587829B1 (en) 1997-09-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93903777A Revoked EP0587829B1 (en) 1992-03-05 1993-02-26 Draft regulating process and device for drawing frames

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US (1) US5428870A (en)
EP (1) EP0587829B1 (en)
JP (1) JPH06507456A (en)
CN (1) CN1043792C (en)
CH (1) CH685164A5 (en)
DE (1) DE59307383D1 (en)
ES (1) ES2107654T3 (en)
TW (1) TW255920B (en)
WO (1) WO1993018213A1 (en)

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CN1043792C (en) 1999-06-23
CN1077234A (en) 1993-10-13
DE59307383D1 (en) 1997-10-23
WO1993018213A1 (en) 1993-09-16
EP0587829A1 (en) 1994-03-23
TW255920B (en) 1995-09-01
CH685164A5 (en) 1995-04-13
ES2107654T3 (en) 1997-12-01
JPH06507456A (en) 1994-08-25
US5428870A (en) 1995-07-04

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