EP0439433B1 - Pneumatic spool valve - Google Patents

Pneumatic spool valve Download PDF

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Publication number
EP0439433B1
EP0439433B1 EP91810048A EP91810048A EP0439433B1 EP 0439433 B1 EP0439433 B1 EP 0439433B1 EP 91810048 A EP91810048 A EP 91810048A EP 91810048 A EP91810048 A EP 91810048A EP 0439433 B1 EP0439433 B1 EP 0439433B1
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EP
European Patent Office
Prior art keywords
valve
spool
pressure
drive
slide
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
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EP91810048A
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German (de)
French (fr)
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EP0439433A1 (en
Inventor
Daniel Bruderer
Peter Iseli
Alois Bieri
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.)
Norgren AG
Walter AG
Original Assignee
IMI Norgren AG
Walter AG
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Priority to AT91810048T priority Critical patent/ATE101901T1/en
Publication of EP0439433A1 publication Critical patent/EP0439433A1/en
Application granted granted Critical
Publication of EP0439433B1 publication Critical patent/EP0439433B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram

Definitions

  • the invention relates to a pneumatic slide valve according to the preamble of independent claim 1.
  • a control valve of this type has become known in the prior art from DE-A-32 21 928 and DE-A-32 16 692.
  • EP-A-0 288 719 has disclosed a control device for a pneumohydraulic power drive, the output variable of which is a feed movement of a piston rod which is carried out with a certain force and speed.
  • this device has become freely programmable. This means that switching points, feed forces etc. are numerical can be specified precisely and thus improve the quality of the drive.
  • the function of the facility remains unchanged; no matter in which function mode it is operated. It is and remains a pneumohydraulic feed drive.
  • the invention has for its object to provide a control valve improved in terms of dynamics and slide stability.
  • the object is achieved by the invention according to claim 1.
  • the slide valve according to the invention can be switched from one operating mode to the other in any working position and shows a significantly higher dynamic and a higher slide stability.
  • the function of the slide valve according to the invention is thus clearly changed by switching the function modes.
  • the pressure control gain can be achieved can be gradually adapted to an optimal overall system dynamic. With very good linearity and minimal hysteresis, the air can be vented very quickly. Good response sensitivity is achieved even at high flow rates.
  • the slide valve according to the invention is further distinguished by a particularly compact design. Finally, this valve avoids undefined intermediate states when switching from one operating mode to the other. Further advantageous features result from the dependent claims and the following description.
  • the 3-way proportional pressure control valve shown in Fig. 1 consists essentially of a valve block 8 with two closure parts 9 and 10, a slide sleeve 6, a longitudinal slide 7 shown here in the middle position, a drive 13 and two sensors 11 and 16.
  • Pressure control valve a valve is understood that regulates the pressure on the consumer side independently of pressure fluctuations in the line network and the size of the air consumption.
  • the drive 13 is a moving coil drive and serves to move the slide 7 to regulate the pressure or the amount in its longitudinal direction.
  • the drive has the function of a converter.
  • the electrical manipulated variable is converted electromagnetically into a proportional force by the converter, which then moves the slide.
  • the drive has a coil 12 which is connected to the slide and moves in an air gap of the iron core 14 of a permanent magnet. If an electrical current flows through the coil 12, a force proportional to the current arises. One coil current direction pulls the coil 12 into the magnet and the other coil current direction pushes the coil out of the magnet.
  • the magnet consists of the closure part 10, an iron core 14 and a permanent magnet 15.
  • a pin 20 attached to the magnet extends through a cylindrical coil carrier 21 and prevents rotation.
  • a small permanent magnet 16 ' is attached to the slide to detect the position of the slide 7. This permanent magnet 16 'protrudes into a bore 9' of the closure part 9. In the bore 9 ', a Hall sensor 16' 'measures the magnetic field surrounding it, which changes in proportion to the slide position.
  • the Hall sensor 16 '' is an analog sensor. It is built on a small ceramic substrate plate. This results in very small dimensions for the position sensor 16 compared to a linear potentiometer with a similar effect.
  • the pressure sensor 11 is an analog, piezoresistive pressure sensor known per se. Under pressure, this sensor produces a change in resistance, which in turn produces an electrical voltage proportional to the change in pressure.
  • the pressure sensor 11 is screwed to the valve block 8 with pins 11 '. The electrical voltage proportional to the change in pressure is made available for processing in accordance with FIGS. 2 and 3 via line 19 to electronics 17.
  • the valve mechanism works as follows: In order to increase the pressure, a voltage jump from, for example, 2 to 8 V is applied to the setpoint input B (FIG. 3). The electronics recognizes that the actual pressure value is too low and sends an electrical current surge into the coil 12, which then moves the slide 7 from the position 4 shown in FIG. 2 to the left into the ventilation position. Shortly before the desired pressure is reached, the electronics energize the coil 12, which pushes the slide back into the central position shown in FIG. 2.
  • the setpoint is reset, for example to 2 V.
  • the sequence is then analogous to that above, except that the slide 7 in FIG. 1 is now pushed to the right into the venting position.
  • the longitudinal slide 7 is air-borne in the metal sealing bush 6.
  • the feed pressure is used, which passes from the longitudinal channel 1b via radial bores 4 in annular grooves 5 and from there between the sealing surfaces of the slide 7 and the bush 6. With insignificant air loss, simple and particularly low-wear storage is achieved.
  • the drive 13, the slide combination 6 and 7, the sensors 11 and 16 and the control electronics 17 form a functional unit that belongs together and also it is possible to switch between the pressure control valve and the proportional directional control valve during operation.
  • the dynamics of the valve are influenced and controlled by several electronic control loops, for example as shown in FIG. 3.
  • 11 denotes a pressure-voltage converter and 16 a position-voltage converter.
  • the comparator A compares the signal of the converter 11 with the electrical pressure setpoint of the input B.
  • a comparator D compares the output of the comparator A with the signal of the converter 16 and causes the slide 7 in the valve 13 to be displaced via the drive 13 of the valve E. one way or another.
  • the converter 11 and the comparator A are switched off. As can be seen, there are no mechanical, but only electronic feedbacks in this valve.
  • the inlet pressure P1 at 1 is preferably less than or equal to 12 bar and the working pressure P2 between 0 and 10 bar.
  • the supply voltage at C is 24 V DC and the electrical pressure setpoint is between 0 and 10 V DC or 4 and 20 mA.
  • An application example for the pressure control valve according to the invention is the ink metering of a printing press.
  • the pressure at outlet 2 of the valve acts on the piston surface of the cylinder of a metering slide and generates one Pressure spring counteracting positioning force and thus a certain position of the metering slide.
  • the ink layer thickness can be adjusted by changing the pressure setpoint on the pressure control valve.
  • Other examples include the uniform unwinding of a paper roll with a controlled brake cylinder, the constant pressure of a roller in a rolling mill, and the control of impacts and changes in mass in an air suspension with a rubber ball.

Abstract

The pneumatic spool valve has a moving-coil drive (13), by means of which the spool (7) can be displaced axially, via a control loop, for air pressure control. The spool valve furthermore has a pressure sensor (11) for detecting the operating pressure and a position sensor (16) for detecting and controlling the spool position. The valve can be switched over during operation, via the control loop which has at least two control paths, such that it operates as a proportional movement valve or as a proportional flow control valve. In this case, the drive (13), the spool (7), the sensors (11, 16) and the control electronics (17) form a functional unit. <IMAGE>

Description

Die Erfindung betrifft ein pneumatisches Schieberventil nach dem Oberbegriff des unabhängigen Patentanspruchs 1.The invention relates to a pneumatic slide valve according to the preamble of independent claim 1.

Im Stand der Technik ist ein Steuerventil dieser Gattung durch die DE-A-32 21 928 und die DE-A-32 16 692 bekannt geworden.A control valve of this type has become known in the prior art from DE-A-32 21 928 and DE-A-32 16 692.

Ferner ist durch die EP-A-0 288 719 eine Steuereinrichtung für einen pneumohydraulischen Kraftantrieb bekannt geworden, dessen Ausgangsgrösse eine mit bestimmter Kraft und Geschwindigkeit ausgeführte Vorschubbewegung einer Kolbenstange ist.Furthermore, EP-A-0 288 719 has disclosed a control device for a pneumohydraulic power drive, the output variable of which is a feed movement of a piston rod which is carried out with a certain force and speed.

Aufgabe dieser Erfindung ist es, einen pneumohydraulischen Zylinder durch den gezielten Einsatz entsprechender Ventile, Sensoren, Druckluft und elektrischer Energie so anzusteuern, dass dem Zylinder die beiden folgenden unterschiedlichen Bewegungsarten eingeprägt werden können:

  • a) Eilgang / Schnellgang
       Es werden grosse Hübe mit grosser Geschwindigkeit und kleiner Betätigungskraft ausgeführt.
  • b) Schleichgang / Krafthub
       Es werden kleine Hübe mit kleiner Geschwindigkeit und grosser Betätigungskraft ausgeführt.
The object of this invention is to control a pneumohydraulic cylinder through the targeted use of appropriate valves, sensors, compressed air and electrical energy in such a way that the following two different types of movement can be impressed on the cylinder:
  • a) Rapid / overdrive
    Large strokes are carried out with high speed and low actuation force.
  • b) Creep speed / power stroke
    Small strokes are carried out with low speed and great actuation force.

Dank dem Einsatz von Servoventilen, Druck- und Wegsensoren ist diese Einrichtung frei programmierbar geworden. Das bedeutet, dass Umschaltpunkte, Vorschubkräfte etc. numerisch genau vorgegeben werden können und den Antrieb somit qualitativ verbessern. Die Funkion der Einrichtung bleibt aber unverändert; egal in welchem Funktionsmodus es betrieben wird. Es ist und bleibt ein pneumohydraulischer Vorschubantrieb.Thanks to the use of servo valves, pressure and displacement sensors, this device has become freely programmable. This means that switching points, feed forces etc. are numerical can be specified precisely and thus improve the quality of the drive. The function of the facility remains unchanged; no matter in which function mode it is operated. It is and remains a pneumohydraulic feed drive.

Der Erfindung liegt die Aufgabe zugrunde, ein bezüglich der Dynamik und der Schieberstabilität verbessertes Steuerventil zu schaffen. Die Aufgabe wird durch die Erfindung gemäss Anspruch 1 gelöst.The invention has for its object to provide a control valve improved in terms of dynamics and slide stability. The object is achieved by the invention according to claim 1.

Das erfindungsgemässe Schieberventil ist in jeder Arbeitslage von einem Betriebsmodus in den anderen umschaltbar und zeigt eine deutlich höhere Dynamik und eine höhere Schieberstabilität.The slide valve according to the invention can be switched from one operating mode to the other in any working position and shows a significantly higher dynamic and a higher slide stability.

Die beiden Funktionsmodi sind:

  • a) Proportional-Wegeventil
       Ein elektrischer Schieberpositionssollwert teilt dem Ventil mit, in welche Position der Ventilschieber bewegt werden soll. Am Ventilausgang wird sich dann ein Volumenstrom und ein Ausgangsdruck einstellen. Der Ausgangsdruck wird aber in diesem Betriebsmodus nicht geregelt.
  • b) Proportional-Druckregelventil
       Ein elektrischer Drucksollwert teilt dem Ventil mit, welcher pneumatische Druck am Ausgang des Ventils eingeregelt werden soll.
The two function modes are:
  • a) Proportional directional valve
    An electrical spool position setpoint tells the valve to which position the spool should be moved. A volume flow and an outlet pressure will then set at the valve outlet. The output pressure is not regulated in this operating mode.
  • b) Proportional pressure control valve
    An electrical pressure setpoint tells the valve which pneumatic pressure should be adjusted at the valve outlet.

Die Funktion des erfindungsgemässen Schieberventils wird also durch das Umschalten der Funktionsmodi eindeutig verändert. Zudem kann die Druckregelverstärkung zur Erzielung einer optimalen Gesamtsystem-Dynamik stufenweise angepasst werden. Bei sehr guter Linearität und minimaler Hysterese kann sehr schnell entlüftet werden. Auch bei hohem Durchfluss wird eine gute Ansprechempfindlichkeit erzielt. In konstruktiver Hinsicht zeichnet sich das erfindungsgemässe Schieberventil weiter durch eine besonders kompakte Bauweise aus. Schliesslich werden bei diesem Ventil beim Umschalten von einem Betriebsmodus in den anderen undefinierte Zwischenzustände vermieden. Weitere vorteilhafte Merkmale ergeben sich aus den abhängigen Ansprüchen und der nachfolgenden Beschreibung.The function of the slide valve according to the invention is thus clearly changed by switching the function modes. In addition, the pressure control gain can be achieved can be gradually adapted to an optimal overall system dynamic. With very good linearity and minimal hysteresis, the air can be vented very quickly. Good response sensitivity is achieved even at high flow rates. In terms of design, the slide valve according to the invention is further distinguished by a particularly compact design. Finally, this valve avoids undefined intermediate states when switching from one operating mode to the other. Further advantageous features result from the dependent claims and the following description.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnungen näher erläutert. Es zeigen:

Fig. 1
ein erfindungsgemässes 3-Wege-Proportional-Druckregelventil im Längsschnitt,
Fig. 2
eine schematisierte Darstellung des Regelventils, und
Fig. 3
ein Schaltbild.
An embodiment of the invention is explained below with reference to the drawings. Show it:
Fig. 1
an inventive 3-way proportional pressure control valve in longitudinal section,
Fig. 2
a schematic representation of the control valve, and
Fig. 3
a circuit diagram.

Das in Fig. 1 gezeigte 3-Wege-Proportional-Druckregelventil besteht im wesentlichen aus einem Ventilblock 8 mit zwei Verschlussteilen 9 und 10, einer Schieberbüchse 6, einem hier in Mittelstellung gezeigten Längsschieber 7, einem Antrieb 13 und zwei Sensoren 11 und 16. Als Druckregelventil wird ein Ventil verstanden, dass den Druck auf der Verbraucherseite unabhängig von Druckschwankungen im Leitungsnetz und der Grösse des Luftverbrauches regelt.The 3-way proportional pressure control valve shown in Fig. 1 consists essentially of a valve block 8 with two closure parts 9 and 10, a slide sleeve 6, a longitudinal slide 7 shown here in the middle position, a drive 13 and two sensors 11 and 16. As Pressure control valve a valve is understood that regulates the pressure on the consumer side independently of pressure fluctuations in the line network and the size of the air consumption.

Der Antrieb 13 ist ein Tauchspulenantrieb und dient dazu, den Schieber 7 zur Regelung des Druckes oder der Menge in seiner Längsrichtung zu verschieben. Der Antrieb hat die Funktion eines Wandlers. Die elektrische Stellgrösse wird durch den Wandler elektromagnetisch in eine proportionale Kraft umgesetzt, welche dann den Schieber bewegt. Der Antrieb besitzt eine Spule 12, die mit dem Schieber verbunden ist und sich in einem Luftspalt des Eisenkerns 14 eines Dauermagneten bewegt. Fliesst ein elektrischer Strom durch die Spule 12, so entsteht eine zum Strom proportionale Kraft. Eine Spulenstromrichtung zieht die Spule 12 in den Magneten und die andere Spulenstromrichtung stösst die Spule aus dem Magneten. Der Magnet besteht aus dem Verschlussteil 10, einem Eisenkern 14 und einem Dauermagneten 15. Ein am Magnet befestigter Stift 20 greift durch einen zylindrischen Spulenträger 21 hindurch und verhindert eine Rotation.The drive 13 is a moving coil drive and serves to move the slide 7 to regulate the pressure or the amount in its longitudinal direction. The drive has the function of a converter. The electrical manipulated variable is converted electromagnetically into a proportional force by the converter, which then moves the slide. The drive has a coil 12 which is connected to the slide and moves in an air gap of the iron core 14 of a permanent magnet. If an electrical current flows through the coil 12, a force proportional to the current arises. One coil current direction pulls the coil 12 into the magnet and the other coil current direction pushes the coil out of the magnet. The magnet consists of the closure part 10, an iron core 14 and a permanent magnet 15. A pin 20 attached to the magnet extends through a cylindrical coil carrier 21 and prevents rotation.

Die Schieberkombination mit dem Längsschieber 7 und der Schieberbüchse 6 wird von der Luft radial und axial durchflossen. In an sich bekannter Weise sind ein Versorgungsanschluss 1, ein Arbeitsanschluss 2 und ein Entlüftungsanschluss 3 über Ringkanäle 1c und 3b sowie einer Längsbohrung 1b im Schieber 7 sowie über Durchlässe 1a, 2a und 3a in der Schieberbüchse 6 verbindbar. Steuerkanten am Mittelweg 22 des Schiebers 7 und die gegenüberliegenden Kanten der Schieberbüchse 6 übernehmen die Luftdurchlass-Regulierung.The slide combination with the longitudinal slide 7 and the slide sleeve 6 is flowed through radially and axially by the air. In a manner known per se, there are a supply connection 1, a working connection 2 and a ventilation connection 3 via ring channels 1c and 3b and a longitudinal bore 1b in the slide 7 and via passages 1a, 2a and 3a in the slide bush 6 connectable. Control edges on the middle path 22 of the slide 7 and the opposite edges of the slide sleeve 6 take over the air passage regulation.

Zur Erfassung der Position des Schiebers 7 ist auf dem Schieber ein kleiner Dauermagnet 16' befestigt. Dieser Dauermagnet 16' ragt in eine Bohrung 9' des Verschlussteils 9. In der Bohrung 9' misst ein Hallsensor 16'' das ihn umgebende Magnetfeld, welches sich proportional zur Schieberstellung verändert. Der Hallsensor 16'' ist ein analoger Sensor. Er ist auf einem kleinen Keramiksubstrat-Plättchen aufgebaut. Dadurch erhält man, im Vergleich zu einem ähnlich wirkenden Linear-Potentiometer, sehr kleine Abmessungen für den Positionssensor 16.A small permanent magnet 16 'is attached to the slide to detect the position of the slide 7. This permanent magnet 16 'protrudes into a bore 9' of the closure part 9. In the bore 9 ', a Hall sensor 16' 'measures the magnetic field surrounding it, which changes in proportion to the slide position. The Hall sensor 16 '' is an analog sensor. It is built on a small ceramic substrate plate. This results in very small dimensions for the position sensor 16 compared to a linear potentiometer with a similar effect.

Der Drucksensor 11 ist ein an sich bekannter analoger, piezoresistiver Drucksensor. Unter Druckeinwirkung ergibt sich an diesem Sensor eine Widerstandsänderung, die wiederum eine der Druckänderung proportionale elektrische Spannung ergibt. Der Drucksensor 11 ist mit Stiften 11' am Ventilblock 8 angeschraubt. Die der Druckänderung proportionale elektrische Spannung wird gemäss den Fig. 2 und 3 über die Leitung 19 der Elektronik 17 zur Aufbereitung zur Verfügung gestellt.The pressure sensor 11 is an analog, piezoresistive pressure sensor known per se. Under pressure, this sensor produces a change in resistance, which in turn produces an electrical voltage proportional to the change in pressure. The pressure sensor 11 is screwed to the valve block 8 with pins 11 '. The electrical voltage proportional to the change in pressure is made available for processing in accordance with FIGS. 2 and 3 via line 19 to electronics 17.

Die Ventilmechanik arbeitet wie folgt: Um den Druck zu vergrössern, wird am Sollwerteingang B (Fig. 3) ein Spannungssprung von beispielsweise 2 auf 8 V angelegt. Die Elektronik erkennt, dass der Druckistwert zu klein ist und schickt einen elektrischen Stromstoss in die Spule 12, welche dann den Schieber 7 aus der in Fig. 2 gezeigten Stellung 4 nach links in die Belüftungs-Stellung bewegt. Kurz bevor der gewünschte Druck erreicht ist, bestromt die Elektronik die Spule 12, welche den Schieber wieder in die in Fig. 2 gezeigte Mittelstellung schiebt.The valve mechanism works as follows: In order to increase the pressure, a voltage jump from, for example, 2 to 8 V is applied to the setpoint input B (FIG. 3). The electronics recognizes that the actual pressure value is too low and sends an electrical current surge into the coil 12, which then moves the slide 7 from the position 4 shown in FIG. 2 to the left into the ventilation position. Shortly before the desired pressure is reached, the electronics energize the coil 12, which pushes the slide back into the central position shown in FIG. 2.

Um den Druck zu verkleinern, wird der Sollwert zurück, beispielsweise auf 2 V gesetzt. Der Ablauf ist dann analog wie oben, ausser dass nun der Schieber 7 in Fig. 1 nach rechts in die Entlüftungs-Stellung geschoben wird.To reduce the pressure, the setpoint is reset, for example to 2 V. The sequence is then analogous to that above, except that the slide 7 in FIG. 1 is now pushed to the right into the venting position.

Zur Ausführung dieser Bewegungen ist der Längsschieber 7 in der metallisch dichtenden Büchse 6 luftgelagert. Verwendet wird hierzu der Speisedruck, der vom Längskanal 1b über radiale Bohrungen 4 in Ringnuten 5 und von dort zwischen die Dichtungsflächen des Schiebers 7 und der Büchse 6 gelangt. Bei unbedeutendem Luftverlust wird damit eine einfache und besonders verschleissarme Lagerung erreicht.To perform these movements, the longitudinal slide 7 is air-borne in the metal sealing bush 6. For this purpose, the feed pressure is used, which passes from the longitudinal channel 1b via radial bores 4 in annular grooves 5 and from there between the sealing surfaces of the slide 7 and the bush 6. With insignificant air loss, simple and particularly low-wear storage is achieved.

Wesentlich ist, dass der Antrieb 13, die Schieberkombination 6 und 7, die Sensoren 11 und 16 und die Regelelektronik 17 eine zusammengehörende Funktionseinheit bilden und auch während des Betriebes ein Umschalten zwischen Druckregelventil und Proportionalwegeventil möglich ist. Beeinflusst und kontrolliert wird die Dynamik des Ventils durch mehrere elektronische Reglerschleifen, beispielsweise wie in Fig. 3 gezeigt. Im Schaltbild nach Fig. 3 sind mit 11 ein Druck-Spannungswandler und mit 16 ein Positions-Spannungswandler bezeichnet. Im Druckregelbetrieb vergleicht der Komparator A das Signal des Wandlers 11 mit dem elektrischen Drucksollwert des Eingangs B. Ein Komparator D vergleicht den Ausgang des Komparator A mit dem Signal des Wandlers 16 und bewirkt über dem Antrieb 13 des Ventils E eine Verschiebung des Schiebers 7 in der einen oder anderen Richtung. Beim Betrieb als Proportionalwegeventil sind der Wandler 11 und der Komparator A ausgeschaltet. Wie ersichtlich gibt es in diesem Ventil keine mechanischen, sondern nur elektronische Rückführungen.It is essential that the drive 13, the slide combination 6 and 7, the sensors 11 and 16 and the control electronics 17 form a functional unit that belongs together and also it is possible to switch between the pressure control valve and the proportional directional control valve during operation. The dynamics of the valve are influenced and controlled by several electronic control loops, for example as shown in FIG. 3. In the circuit diagram according to FIG. 3, 11 denotes a pressure-voltage converter and 16 a position-voltage converter. In pressure control mode, the comparator A compares the signal of the converter 11 with the electrical pressure setpoint of the input B. A comparator D compares the output of the comparator A with the signal of the converter 16 and causes the slide 7 in the valve 13 to be displaced via the drive 13 of the valve E. one way or another. When operating as a proportional directional control valve, the converter 11 and the comparator A are switched off. As can be seen, there are no mechanical, but only electronic feedbacks in this valve.

Der Eingangsdruck P1 bei 1 ist vorzugsweise kleiner gleich 12 bar und der Arbeitsdruck P2 zwischen 0 und 10 bar. Die Versorgungsspannung beträgt bei C 24 V DC und der elektrische Drucksollwert liegt zwischen 0 und 10 V DC, bzw. 4 und 20 mA.The inlet pressure P1 at 1 is preferably less than or equal to 12 bar and the working pressure P2 between 0 and 10 bar. The supply voltage at C is 24 V DC and the electrical pressure setpoint is between 0 and 10 V DC or 4 and 20 mA.

Ein Anwendungsbeispiel für das erfindungsgemässe Druckregelventil ist die Farbdosierung einer Druckmaschine. Hierbei wirkt der Druck am Ausgang 2 des Ventils auf die Kolbenfläche des Zylinders eines Dosierschiebers und erzeugt eine einen Druckfeder entgegenwirkende Stellkraft und damit eine bestimmte Stellung des Dosierschiebers. Dadurch wird ein gleichmässiger Farbauftrag von der Farbwalze mitgenommen. Die Farbschicht -Dicke kann durch eine Aenderung des Drucksollwertes am Druckregelventil verstellt werden. Weitere Bespiele sind das gleichmässige Abspulen einer Papierrolle mit einem geregelten Bremszylinder, das Konstanthalten des Druckes einer Walze eines Walzwerkes sowie das Ausregeln von Schlägen und Massenänderungen bei einer Luftfederung mit Gummiball.An application example for the pressure control valve according to the invention is the ink metering of a printing press. Here, the pressure at outlet 2 of the valve acts on the piston surface of the cylinder of a metering slide and generates one Pressure spring counteracting positioning force and thus a certain position of the metering slide. As a result, an even ink application is carried along by the ink roller. The ink layer thickness can be adjusted by changing the pressure setpoint on the pressure control valve. Other examples include the uniform unwinding of a paper roll with a controlled brake cylinder, the constant pressure of a roller in a rolling mill, and the control of impacts and changes in mass in an air suspension with a rubber ball.

Claims (4)

  1. A pneumatic spool valve having a drive (13) by means of which the spool (7) can be axially displaced by way of a control loop for the purpose of controlling the air pressure, characterised in that the valve comprises a pressure sensor (11) for detecting the working pressure and a position sensor (16) for detecting and controlling the spool position, and that it can be switched during the operation by way of the control loop which comprises at least two regulating loops, in such a way that it functions as a proportional position valve or as a proportional pressure regulating valve and hereby the drive (13), the spool (7) and the sensors (11,16) as well as the control electronics (17) form one functional element.
  2. A spool valve according to claim 1, characterised in that the drive (13) is a position-controlled moving-coil drive.
  3. A spool valve according to claim 1 or 2, characterised in that the valve comprises a spool combination which seals in a metallic manner having a valve bush (6) and a spool (7) air-cushioned therein.
  4. A spool valve according to any one of claims 1 to 3, characterised in that the dynamics of the valve are influenced and controlled by virture of a plurality of electronic regulating loops and only electronic returns are provided.
EP91810048A 1990-01-23 1991-01-22 Pneumatic spool valve Expired - Lifetime EP0439433B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91810048T ATE101901T1 (en) 1990-01-23 1991-01-22 PNEUMATIC SLIDE VALVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH20990 1990-01-23
CH209/90 1990-01-23

Publications (2)

Publication Number Publication Date
EP0439433A1 EP0439433A1 (en) 1991-07-31
EP0439433B1 true EP0439433B1 (en) 1994-02-23

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EP91810048A Expired - Lifetime EP0439433B1 (en) 1990-01-23 1991-01-22 Pneumatic spool valve

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EP (1) EP0439433B1 (en)
AT (1) ATE101901T1 (en)
DE (1) DE59101036D1 (en)

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Publication number Priority date Publication date Assignee Title
DE4218320A1 (en) * 1992-06-03 1993-12-09 Siemens Ag Method and device for testing a valve driven by a medium
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EP0439433A1 (en) 1991-07-31
DE59101036D1 (en) 1994-03-31

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