EP0890030B1 - Safety circuit - Google Patents

Safety circuit Download PDF

Info

Publication number
EP0890030B1
EP0890030B1 EP97901050A EP97901050A EP0890030B1 EP 0890030 B1 EP0890030 B1 EP 0890030B1 EP 97901050 A EP97901050 A EP 97901050A EP 97901050 A EP97901050 A EP 97901050A EP 0890030 B1 EP0890030 B1 EP 0890030B1
Authority
EP
European Patent Office
Prior art keywords
safety
control
safety circuit
valve
drive part
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
EP97901050A
Other languages
German (de)
French (fr)
Other versions
EP0890030A1 (en
Inventor
Wolfgang Britz
Reiner Hans Hertzig
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.)
Hydac Technology GmbH
Original Assignee
Hydac Technology 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 Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP0890030A1 publication Critical patent/EP0890030A1/en
Application granted granted Critical
Publication of EP0890030B1 publication Critical patent/EP0890030B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/002—Electrical failure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/16—Trip gear
    • F01D21/18—Trip gear involving hydraulic means

Definitions

  • the invention relates to a safety circuit with the features of the preamble of claim 1.
  • Hydraulic drives with two different directions of travel Movable drive part can, for example, from a hydraulic Differential or synchronous cylinders are formed, the working pistons as drive parts Carry out feed movements, for example a steam control valve to control or train this yourself.
  • the fluid or oil supply takes place usually via pressure accumulator, but also separately depending on the requirement arranged safety pressure accumulator can be used.
  • the steam valve can be moved to any valve position.
  • the steam control valve can be designed as a shut-off and control valve with Quick opening or quick closing priority as well as a so-called safety valve with quick opening priority.
  • the priorities mentioned play in particular then a role if the steam control valve is used in safety-relevant areas Use comes, for example, of power plant technology, whereby in emergency operation it must be ensured that the steam control valve can be predetermined definable end positions takes as soon as possible.
  • the known safety circuits such as it is disclosed for example for a hydraulic press by DE 36 31 104 A1 the relevant safety functions are often used by electronic circuits monitored and carried out, but prone to failure and failure are and therefore do not trigger the required switching process with absolute certainty.
  • GB-A-2 057 718 is a generic safety circuit for Actuation of a hydraulic drive with one in two different from each other Movement directions movable drive part known to any Method can be controlled by a control circuit in the form of a servo system, a safety circuit hydraulically superimposed on the control circuit is that when the same is turned off, the drive part exclusively from the respective safety circuit can be controlled.
  • the known one Safety circuit is particularly useful when driving rotor blades Helicopters used.
  • the triggering of the safety function is not defined by the Control of the switching valve of the control switching part via the safety switching part, Rather, the switching valve is via a hydraulic pump of the safety circuit of the control circuit. The pressurized connection then comes to the hydraulic drive by means of the same hydraulic pump Safety switching part also controlled via this switching valve.
  • the invention is based on the object a safety circuit for controlling a hydraulic drive create that is immune to interference and a high level of security offers. This task is performed by a safety circuit with the characteristics of Claim 1 solved.
  • the first safety switching part controls the first switching valve to shut off the pressure-carrying connection and via at least one second switching valve the pressure-carrying connection to the manufactures hydraulic drive, a safety circuit is realized, which itself in the event of a power failure, the required safety function is fulfilled with absolute certainty.
  • the safety circuit is used to control a hydraulic drive 10, which is formed from an actuating cylinder with a double-acting piston Drive part 12, which can be moved back and forth on both sides, in particular in the viewing direction seen on the circuit, reciprocally movable piston rods up and down 14 has.
  • the hydraulic drive (actuating cylinder) 10 can act as a steam control valve trained to change free pipe opening cross-sections (not shown), fully release or close them, or the piston rods mentioned 14 can in turn act on further control valves (not shown).
  • the possible directions of travel of the drive part (piston) 12 are in the circuit with arrows and provided with the words "retract" and "extend” played.
  • Another hydraulic can be used instead of the actuating cylinder 10 Drive depending on the respective application, for example in the manner of a hydraulic motor (not shown).
  • the actuating cylinder 10 Via its connection points A and B, the actuating cylinder 10 is over corresponding fluid-carrying connecting lines with a hydraulic pump P 'and the tank T 'connectable. Depending on whether there is a pressure connection to the hydraulic pump P 'at port A or port B, the moves Piston 12 with its two piston rods 14 in the direction of view of the circuit diagram seen down or up.
  • the actuating cylinder 10 For the control of the relevant Movement is the actuating cylinder 10 to one designated as a whole by 16 hydraulic control block connected, as well as the hydraulic pump P 'and the tank T'.
  • the corresponding ones can be in particular towards the tank side Connecting lines can be provided with adjustable chokes 18.
  • the better Because of the illustration, not all of the fluid-carrying lines in control block 16 are Connection lines drawn with solid lines. Much more also represent the dotted and broken lines possible fluid-carrying connections.
  • the actual control function of the actuating cylinder 10, that is to say as a function of it from the system state essentially continuous Opening and closing procedures for the piston 12 take place via the 4/3-way valve (Control switching part) MV3 with the magnets Y3 and Y4.
  • the regulation mentioned is carried out by a 3-point step controller, can also be done by a pure impulse control or through a completely continuous control. In the case of complete continuous control is used instead of the slide valve shown a proportional or servo valve is used.
  • the 4/3-way valve MV3 is on the output side with its two connections A, B each to a first one Switching valve (cartridge valve) LERA and LERB connected.
  • the two control connections X of the first switching valves LERA and LERB are via the shuttle valve W3 to the fluid-carrying outlet A of a first one Safety switching part (solenoid valve) MV1 of the safety circuit in the form a 4/2-way valve connected via the assigned magnet Y1 is excitable. Furthermore, a connecting line leads from the shuttle valve W3 to the fluid-carrying output B of a second safety switching part (Solenoid valve) MV2 in the form of a 4/2-way valve, which is above the magnet Y2 can be controlled.
  • the two solenoid valves MV1 and MV2 are in their de-energized, i.e. de-energized position in the circuit diagram.
  • the Magnet Y1 controls the solenoid valve MV1, it is excited and takes its Left switch position as seen in the direction of the circuit diagram.
  • the two control connections X of the cartridge valves LERA and LERB are also depressurized, with the result that the addressed Open the cartridge valves.
  • the actuating cylinder 10 is retracted or extended. The relevant control results from that above the Circuit diagram arranged overview table.
  • a defined or quick closing process should be carried out during the Adjusting cylinder 10 may be provided.
  • This is the top priority function via the two second switching valves (cartridge valves) LEPA and LETB.
  • LETB connects the chamber B of the cylinder to the tank connection T Control, whereas LEPA chamber A with the pressurized connection P of the control connects with the result that the piston 12 extends completely.
  • the cartridge valves are actuated in turn via the first safety switching part MV1.
  • the two control connections X of the cartridge valves LEPA and LETB are depressurized switched so that the cartridge valves LEPA and LETB to control the Actuating cylinder 10 can open.
  • the two control connections X of the first switching valves LERA and LERB now via Shuttle valve W3 pressurized with the result that the first switching valves LERA and LERB remain closed and the control function is bridged.
  • Another "quick open" switching function that can be achieved with the safety circuit takes place via the control of the second safety switching part MV2.
  • This function is enabled by energizing magnet Y1 Solenoid valve MV1.
  • solenoid Y2 of solenoid valve MV2 the assigned control connections X of the cartridge valves LETA and LEPB relieved and thus depressurized.
  • the LETA cartridge valve can then connect chamber A of the cylinder to the tank connection of the control and cartridge valve LEPB connects the chamber B of the actuating cylinder 10 with the connection P of the control.
  • the one at connection B of the solenoid valve MV2 Pending pump pressure brings the closing part of the shuttle valve W3 in its right-hand closed position and the fluid pressure in the control connections X the cartridge valves LERA and LERB are closed.
  • the control connections X of the cartridge valves LEPA and LETB under fluid pressure and the Cartridge valves LEPA and LETB remain closed.
  • the safety function can be reversed An opening process can also be triggered. Even in one in this case, the usual regulation and closing function would this highest priority can then be overlaid with safe execution.

Abstract

The invention relates to a safety circuit for controlling a hydraulic drive (10) with a drive part (12) movable in at least two different directions of movement and controllable for any movement by a control switching circuit. A safety circuit which ensures the required safety function in an absolutely safe manner, even in the event of a power failure, is obtained in that at least one safety switching circuit is hydraulically combined with the control switching circuit in such a manner that when the latter is switched off the drive part (12) can only be controlled by the respective safety switching circuit. Consequently, the highest-priority operation provided in an emergency, for example in the form of the defined closing or opening of a vapour control valve, is safely executed and the otherwise usual control process is interrupted by the control switching circuit.

Description

Die Erfindung betrifft eine Sicherheitsschaltung mit den Merkmalen des Oberbegriffes des Anspruches 1.The invention relates to a safety circuit with the features of the preamble of claim 1.

Hydraulische Antriebe mit einem in zwei voneinander verschiedenen Verfahrrichtungen bewegbaren Antriebsteil können beispielsweise aus einem hydraulischen Differential- oder Gleichgangzylinder gebildet sein, deren Arbeitskolben als Antriebsteile Zustellbewegungen ausführen, um beispielsweise ein Dampfstellventil anzusteuern oder dieses selbst auszubilden. Die Fluid- oder Ölversorgung erfolgt dabei in der Regel über Druckspeicher, wobei je nach Anforderung auch separat angeordnete Sicherheits-Druckspeicher eingesetzt werden. Im normalen Regelbetrieb kann das Dampfventil in jede beliebige Ventilstellung gebracht werden.Hydraulic drives with two different directions of travel Movable drive part can, for example, from a hydraulic Differential or synchronous cylinders are formed, the working pistons as drive parts Carry out feed movements, for example a steam control valve to control or train this yourself. The fluid or oil supply takes place usually via pressure accumulator, but also separately depending on the requirement arranged safety pressure accumulator can be used. In normal regular operation the steam valve can be moved to any valve position.

Das Dampfstellventil kann ausgebildet sein als Absperr- und Regelventil mit Schnellöffnungs- oder Schnellschließungspriorität sowie als sog. Sicherheitsventil mit Schnellöffnungspriorität. Die angesprochenen Prioritäten spielen insbesondere dann eine Rolle, wenn das Dampfstellventil in sicherheitsrelevanten Bereichen zum Einsatz kommt, wie beispielsweise der Kraftwerkstechnologie, wobei im Notbetrieb gewährleistet sein muß, daß das Dampfstellventil vorgebbare definierte Endstellungen schnellstmöglich einnimmt. Bei den bekannten Sicherheitsschaltungen, wie sie beispielsweise für eine hydraulische Presse durch die DE 36 31 104 A1 offenbart sind, werden die dahingehenden Sicherheitsfunktionen häufig von Elektronikschaltungen überwacht und durchgeführt, die jedoch versagens- und störanfällig sind und mithin nicht mit absoluter Sicherheit den benötigten Schaltvorgang auslösen. The steam control valve can be designed as a shut-off and control valve with Quick opening or quick closing priority as well as a so-called safety valve with quick opening priority. The priorities mentioned play in particular then a role if the steam control valve is used in safety-relevant areas Use comes, for example, of power plant technology, whereby in emergency operation it must be ensured that the steam control valve can be predetermined definable end positions takes as soon as possible. In the known safety circuits, such as it is disclosed for example for a hydraulic press by DE 36 31 104 A1 the relevant safety functions are often used by electronic circuits monitored and carried out, but prone to failure and failure are and therefore do not trigger the required switching process with absolute certainty.

Durch die GB-A-2 057 718 ist eine gattungsgemäße Sicherheitsschaltung zum Ansteuern eines hydraulischen Antriebes mit einem in zwei voneinander verschiedenen Verfahrrichtungen bewegbaren Antriebsteil bekannt, das zum beliebigen Verfahren von einem Regelschaltkreis in Form eines Servosystemes ansteuerbar ist, wobei ein Sicherheitsschaltkreis dem Regelschaltkreis hydraulisch derart überlagert ist, daß unter Ausschaltung desselben das Antriebsteil ausschließlich von dem jeweiligen Sicherheitsschaltkreis ansteuerbar ist. Die dahingehende bekannte Sicherheitsschaltung wird insbesondere beim Ansteuern von Rotorblättern bei Hubschraubern eingesetzt.GB-A-2 057 718 is a generic safety circuit for Actuation of a hydraulic drive with one in two different from each other Movement directions movable drive part known to any Method can be controlled by a control circuit in the form of a servo system, a safety circuit hydraulically superimposed on the control circuit is that when the same is turned off, the drive part exclusively from the respective safety circuit can be controlled. The known one Safety circuit is particularly useful when driving rotor blades Helicopters used.

Das Auslösen der Sicherheitsfunktion geschieht jedoch nicht definiert durch das Ansteuern des Schaltventiles des Regelschaltteiles über das Sicherheitsschaltteil, sondern vielmehr wird das Schaltventil über eine Hydropumpe des Sicherheitsschaltkreises des Regelschaltkreises angesteuert. Die druckführende Verbindung zum hydraulischen Antrieb mittels derselben Hydropumpe kommt dann vom Sicherheitsschaltteil angesteuert ebenfalls über dieses Schaltventil zustande. Durch das Zusammenfassen mehrerer sicherheitsrelevanter Funktionen, bezogen auf ein Schaltventil des Regelschaltkreises, ist eine absolut sichere Funktion bei dieser bekannten Lösung nicht erreichbar.The triggering of the safety function is not defined by the Control of the switching valve of the control switching part via the safety switching part, Rather, the switching valve is via a hydraulic pump of the safety circuit of the control circuit. The pressurized connection then comes to the hydraulic drive by means of the same hydraulic pump Safety switching part also controlled via this switching valve. By the combination of several security-related functions, related to one Switching valve of the control circuit is an absolutely safe function with this known solution not available.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Sicherheitsschaltung zum Ansteuern eines hydraulischen Antriebes zu schaffen, die unanfällig gegen Störungen ist und ein hohes Maß an Sicherheit bietet. Diese Aufgabe wird durch eine Sicherheitsschaltung mit den Merkmalen des Anspruches 1 gelöst.Starting from this prior art, the invention is based on the object a safety circuit for controlling a hydraulic drive create that is immune to interference and a high level of security offers. This task is performed by a safety circuit with the characteristics of Claim 1 solved.

Dadurch, daß gemäß dem kennzeichnenden Teil des Anspruches 1 zum Auslösen einer Sicherheitsfunktion durch das Antriebsteil das erste Sicherheitsschaltteil das erste Schaltventil zum Absperren der druckführenden Verbindung ansteuert und über mindestens ein zweites Schaltventil die druckführende Verbindung zum hydraulischen Antrieb herstellt, ist eine Sicherheitsschaltung verwirklicht, die selbst bei Stromausfall die geforderte Sicherheitsfunktion mit absoluter Sicherheit erfüllt. Dadurch, daß für verschiedene Funktionen zwei voneinander getrennt arbeitende Schaltventile vorhanden sind, die jeweils von dem ersten Sicherheitsschaltteil ansteuerbar sind, sind sicherheitsrelevante Funktionen schalttechnisch voneinander entkoppelt und mithin sicher beherrschbar. Aufgrund dieser Anordnung ist auf jeden Fall gewährleistet, daß eine hydraulische Schaltfunktion definiert sich einstellt unabhängig vom übrigen Systemzustand des Hydraulikkreises und seiner einzelnen Steuerelemente. Durch die erfindungsgemäße hydraulische Sicherheitsschaltung sind jedenfalls Ausfälle und Fehlschaltungen mit Sicherheit vermieden.Characterized in that according to the characterizing part of claim 1 for triggering a safety function by the drive part, the first safety switching part controls the first switching valve to shut off the pressure-carrying connection and via at least one second switching valve the pressure-carrying connection to the manufactures hydraulic drive, a safety circuit is realized, which itself in the event of a power failure, the required safety function is fulfilled with absolute certainty. The fact that two separate functions work for different functions There are switching valves, each of the first safety switching part can be controlled, safety-related functions are different from one another in terms of switching technology decoupled and therefore safely controllable. Because of this arrangement is on ensures in any case that a hydraulic switching function is defined regardless of the other system status of the hydraulic circuit and its individual Controls. By the hydraulic safety circuit according to the invention failures and switching errors are definitely avoided.

Weitere vorteilhafte Ausgestaltungen der Sicherheitsschaltung sind Gegenstand der Unteransprüche. Im folgenden wird die erfindungsgemäße Schaltvorrichtung anhand eines Schaltplanes näher erläutert, wobei in Blickrichtung auf die Figur gesehen oben links eine Funktionstabelle wiedergegeben ist.Further advantageous refinements of the safety circuit are the subject of Dependent claims. The switching device according to the invention is described below of a circuit diagram explained in more detail, looking in the direction of the figure a function table is shown at the top left.

Die Sicherheitsschaltung dient dem Ansteuern eines hydraulischen Antriebes 10, der aus einem Stellzylinder gebildet ist, mit einem doppelt wirkenden Kolben als Antriebsteil 12, der beidseitig hin- und herbewegbar, insbesondere in Blickrichtung auf die Schaltung gesehen, nach oben und unten wechselweise verfahrbare Kolbenstangen 14 aufweist. Der hydraulische Antrieb (Stellzylinder) 10 kann als Dampfstellventil ausgebildet freie Rohröffnungsquerschnitte (nicht dargestellt) verändern, diese vollständig freigeben oder verschließen, oder die angesprochenen Kolbenstangen 14 können wiederum auf weitere Stellventile (nicht dargestellt) einwirken. Die möglichen Verfahrrichtungen des Antriebsteiles (Kolbens) 12 sind in der Schaltung mit Pfeilen sowie versehen mit der Angabe "Einfahren" und "Ausfahren" wiedergegeben. An die Stelle des Stellzylinders 10 kann auch ein anderer hydraulischer Antrieb in Abhängigkeit von der jeweiligen Verwendung eingesetzt werden, beispielsweise in der Art eines Hydromotors (nicht dargestellt). The safety circuit is used to control a hydraulic drive 10, which is formed from an actuating cylinder with a double-acting piston Drive part 12, which can be moved back and forth on both sides, in particular in the viewing direction seen on the circuit, reciprocally movable piston rods up and down 14 has. The hydraulic drive (actuating cylinder) 10 can act as a steam control valve trained to change free pipe opening cross-sections (not shown), fully release or close them, or the piston rods mentioned 14 can in turn act on further control valves (not shown). The possible directions of travel of the drive part (piston) 12 are in the circuit with arrows and provided with the words "retract" and "extend" played. Another hydraulic can be used instead of the actuating cylinder 10 Drive depending on the respective application, for example in the manner of a hydraulic motor (not shown).

Über seine Anschlußstellen A und B ist der Stellzylinder 10 über entsprechende fluidführende Verbindungsleitungen mit einer Hydropumpe P' und dem Tank T' verbindbar. Je nachdem, ob eine druckführende Verbindung zu der Hydropumpe P' am Anschluß A oder am Anschluß B anliegt, bewegt sich der Kolben 12 mit seinen beiden Kolbenstangen 14 in Blickrichtung auf den Schaltplan gesehen nach unten bzw. nach oben. Für die Ansteuerung der dahingehenden Bewegung ist der Stellzylinder 10 an einen als Ganzes mit 16 bezeichneten hydraulischen Steuerblock angeschlossen, ebenso wie die Hydropumpe P' und der Tank T'. Insbesondere zur Tankseite hin können die entsprechenden Verbindungsleitungen mit einstellbaren Drosseln 18 versehen sein. Der besseren Darstellung wegen sind nicht alle im Steuerblock 16 verlaufenden fluidführenden Verbindungsleitungen mit durchgehenden Linien gezeichnet. Vielmehr stellen auch die punktierten und unterbrochen liniert dargestellten Leitungen mögliche fluidführende Verbindungen dar.Via its connection points A and B, the actuating cylinder 10 is over corresponding fluid-carrying connecting lines with a hydraulic pump P 'and the tank T 'connectable. Depending on whether there is a pressure connection to the hydraulic pump P 'at port A or port B, the moves Piston 12 with its two piston rods 14 in the direction of view of the circuit diagram seen down or up. For the control of the relevant Movement is the actuating cylinder 10 to one designated as a whole by 16 hydraulic control block connected, as well as the hydraulic pump P 'and the tank T'. The corresponding ones can be in particular towards the tank side Connecting lines can be provided with adjustable chokes 18. The better Because of the illustration, not all of the fluid-carrying lines in control block 16 are Connection lines drawn with solid lines. Much more also represent the dotted and broken lines possible fluid-carrying connections.

Die eigentliche Regelungsfunktion des Stellzylinders 10, also die in Abhängigkeit von dem Systemzustand im wesentlichen kontinuierlich erfolgenden Öffnungs- und Schließverfahrvorgänge für den Kolben 12, erfolgt über das 4/3-Wegeventil (Regelschaltteil) MV3 mit den Magneten Y3 und Y4. Bei der vorliegenden Ausführungsform erfolgt die angesprochene Regelung durch einen 3-Punkt-Schrittregler, kann jedoch ebenso durch eine reine Impulssteuerung oder durch eine vollständig kontinuierliche Regelung erfolgen. Im Falle der vollständig kontinuierlichen Regelung wird jedoch anstelle des gezeigten Schieberventiles ein Proportional- oder Servoventil eingesetzt. Das 4/3-Wegeventil MV3 ist dabei ausgangsseitig mit seinen beiden Anschlüssen A,B jeweils an ein erstes Schaltventil (Cartridgeventil) LERA und LERB angeschlossen. Diese Cartridgeventile sowie die nachfolgend beschriebenen Schaltventile, sofern es sich um Cartridgeventile handelt, öffnen grundsätzlich dann, wenn an ihrem jeweiligen Steueranschluß X kein Fluiddruck ansteht, der Steueranschluß X also drucklos gemacht worden ist. The actual control function of the actuating cylinder 10, that is to say as a function of it from the system state essentially continuous Opening and closing procedures for the piston 12 take place via the 4/3-way valve (Control switching part) MV3 with the magnets Y3 and Y4. In the present In one embodiment, the regulation mentioned is carried out by a 3-point step controller, can also be done by a pure impulse control or through a completely continuous control. In the case of complete continuous control is used instead of the slide valve shown a proportional or servo valve is used. The 4/3-way valve MV3 is on the output side with its two connections A, B each to a first one Switching valve (cartridge valve) LERA and LERB connected. These cartridge valves as well as the switching valves described below, if it is Cartridge valves basically open when at their respective Control port X there is no fluid pressure, so the control port X is depressurized has been made.

Die beiden Steueranschlüsse X der ersten Schaltventile LERA und LERB sind über das Wechselventil W3 an den fluidführenden Ausgang A eines ersten Sicherheitsschaltteiles (Magnetventil) MV1 des Sicherheitsschaltkreises in Form eines 4/2-Wegeventils angeschlossen, das über den zugeordneten Magneten Y1 erregbar ist. Des weiteren führt eine Verbindungsleitung von dem Wechselventil W3 zu dem fluidführenden Ausgang B eines zweiten Sicherheitsschaltteiles (Magnetventil) MV2 in Form eines 4/2-Wegeventiles, das über den Magneten Y2 ansteuerbar ist. Die beiden Magnetventile MV1 und MV2 sind in ihrer entregten, also stromlosen Stellung im Schaltplan wiedergegeben. Sobald der Magnet Y1 das Magnetventil MV1 ansteuert, ist dieses erregt und nimmt seine in Blickrichtung auf den Schaltplan gesehen linke Schaltstellung ein. Damit wird die Zuleitung zum Wechselventil W3 auf den Tank T und mithin drucklos geschaltet und die beiden Steueranschlüsse X der Cartridgeventile LERA und LERB werden ebenfalls drucklos, mit der Folge, daß die angesprochenen Cartridgeventile öffnen. In Abhängigkeit davon, ob der Magnet Y3 oder Y4 des Regelschaltteiles MV3 erregt wird, wird der Stellzylinder 10 eingefahren bzw. ausgefahren. Die dahingehende Ansteuerung ergibt sich aus der oberhalb des Schaltplans angeordneten Übersichtstabelle.The two control connections X of the first switching valves LERA and LERB are via the shuttle valve W3 to the fluid-carrying outlet A of a first one Safety switching part (solenoid valve) MV1 of the safety circuit in the form a 4/2-way valve connected via the assigned magnet Y1 is excitable. Furthermore, a connecting line leads from the shuttle valve W3 to the fluid-carrying output B of a second safety switching part (Solenoid valve) MV2 in the form of a 4/2-way valve, which is above the magnet Y2 can be controlled. The two solenoid valves MV1 and MV2 are in their de-energized, i.e. de-energized position in the circuit diagram. Once the Magnet Y1 controls the solenoid valve MV1, it is excited and takes its Left switch position as seen in the direction of the circuit diagram. In order to the supply line to the shuttle valve W3 on the tank T becomes pressureless switched and the two control connections X of the cartridge valves LERA and LERB are also depressurized, with the result that the addressed Open the cartridge valves. Depending on whether the magnet Y3 or Y4 of the Control switching part MV3 is excited, the actuating cylinder 10 is retracted or extended. The relevant control results from that above the Circuit diagram arranged overview table.

Als Sicherheitsfunktion soll ein definierter oder Schnellschließvorgang beim Stellzylinder 10 vorgesehen sein. Diese Funktion mit oberster Priorität erfolgt über die beiden zweiten Schaltventile (Cartridgeventile) LEPA und LETB. LETB verbindet dabei die Kammer B des Zylinders mit dem Tankanschluß T der Steuerung, wohingegen LEPA die Kammer A mit dem druckführenden Anschluß P der Steuerung verbindet mit der Folge, daß der Kolben 12 vollständig ausfährt. Die dahingehende Ansteuerung der Cartridgeventile erfolgt wiederum über das erste Sicherheitsschaltteil MV1. Im dargestellten entregten Zustand sind die beiden Steueranschlüsse X der Cartridgeventile LEPA und LETB drucklos geschaltet, so daß die Cartridgeventile LEPA und LETB zum Ansteuern des Stellzylinders 10 öffnen können. Im Gegensatz hierzu sind die beiden Steueranschlüsse X der ersten Schaltventile LERA und LERB nunmehr über das Wechselventil W3 druckbeaufschlagt mit der Folge, daß die ersten Schaltventile LERA und LERB geschlossen bleiben und die Regelungsfunktion überbrückt ist.As a safety function, a defined or quick closing process should be carried out during the Adjusting cylinder 10 may be provided. This is the top priority function via the two second switching valves (cartridge valves) LEPA and LETB. LETB connects the chamber B of the cylinder to the tank connection T Control, whereas LEPA chamber A with the pressurized connection P of the control connects with the result that the piston 12 extends completely. The cartridge valves are actuated in turn via the first safety switching part MV1. In the de-excited state shown the two control connections X of the cartridge valves LEPA and LETB are depressurized switched so that the cartridge valves LEPA and LETB to control the Actuating cylinder 10 can open. In contrast, the two control connections X of the first switching valves LERA and LERB now via Shuttle valve W3 pressurized with the result that the first switching valves LERA and LERB remain closed and the control function is bridged.

Die dahingehende Schließsicherheitsfunktion ist wiederum in der Übersichtstabelle wiedergegeben, wobei der Magnet Y1 stromlos bleibt. Bei der dahingehenden Ansteuerung werden auch die weiteren Wechselventile W1 und W2 betätigt, die in die fluidführende Verbindung zwischen dem Wechselventil W3 und dem Magnetventil MV1 geschaltet sind mit der Folge, daß die beiden Steueranschlüsse X der noch näher zu erläuternden dritten Schaltventile (Cartridgeventile) LETA und LEPB ebenso geschlossen bleiben, da in ihnen der Pumpendruck ansteht. Die hydraulisch überlagerte Sicherheitsfunktion stellt sich unabhängig vom sonstigen Schaltzustand des Steuerblockes 16 ein, also unabhängig davon, in welchem Erregungszustand sich die anderen Magnete Y2, Y3 und Y4 befinden.The relevant locking security function is again in the overview table reproduced, the magnet Y1 remains de-energized. With the passing one The other shuttle valves W1 and W2 are also activated actuated in the fluid-carrying connection between the shuttle valve W3 and the solenoid valve MV1 are connected with the result that the two Control connections X of the third switching valves (cartridge valves) to be explained in more detail LETA and LEPB also remain closed, since in them the Pump pressure is present. The hydraulically superimposed safety function provides independently of the other switching state of the control block 16, that is regardless of what state of excitation the other magnets are in Y2, Y3 and Y4 are located.

Eine weitere, mit der Sicherheitsschaltung erreichbare Schaltfunktion "Schnellöffnen" erfolgt über die Ansteuerung des zweiten Sicherheitsschaltteiles MV2. Die Freigabe dieser Funktion erfolgt durch Erregen des Magneten Y1 des Magnetventiles MV1. Durch Erregen von Magnet Y2 des Magnetventiles MV2 werden die zugeordneten Steueranschlüsse X der Cartridgeventile LETA und LEPB entlastet und mithin drucklos gemacht. Das Cartridgeventil LETA kann dann die Kammer A des Zylinders mit dem Tankanschluß der Steuerung verbinden und Cartridgeventil LEPB verbindet die Kammer B des Stellzylinders 10 mit dem Anschluß P der Steuerung. Der am Anschluß B des Magnetventiles MV2 anstehende Pumpendruck bringt das Schließteil des Wechselventiles W3 in seine rechte Schließstellung und über den Fluiddruck in den Steueranschlüssen X sind die Cartridgeventile LERA und LERB geschlossen. Ebenso sind über den Ausgang B des Magnetventiles MV1 in seinem erregten Zustand die Steueranschlüsse X der Cartridgeventile LEPA und LETB unter Fluiddruck und die Cartridgeventile LEPA und LETB bleiben geschlossen.Another "quick open" switching function that can be achieved with the safety circuit takes place via the control of the second safety switching part MV2. This function is enabled by energizing magnet Y1 Solenoid valve MV1. By energizing solenoid Y2 of solenoid valve MV2 the assigned control connections X of the cartridge valves LETA and LEPB relieved and thus depressurized. The LETA cartridge valve can then connect chamber A of the cylinder to the tank connection of the control and cartridge valve LEPB connects the chamber B of the actuating cylinder 10 with the connection P of the control. The one at connection B of the solenoid valve MV2 Pending pump pressure brings the closing part of the shuttle valve W3 in its right-hand closed position and the fluid pressure in the control connections X the cartridge valves LERA and LERB are closed. Likewise, are about the Output B of the solenoid valve MV1 in its excited state, the control connections X of the cartridge valves LEPA and LETB under fluid pressure and the Cartridge valves LEPA and LETB remain closed.

Demgegenüber sind die Wechselventile W1 und W2 über den Anschluß A des Magnetventiles MV1 zum Tank T' hin drucklos, so daß die drucklosen Steueranschlüsse X der Cartridgeventile LETA und LEPB deren Öffnung veranlassen mit der Folge, daß der Anschluß B des Stellzylinders 10 an die Hydropumpe P' angeschlossen ist und der Anschluß A an den Tank T'. Dies führt zu einem Schnellöffnungs- oder Einfahrvorgang, wobei der Stellzylinder 10 seine im Schaltplan gezeigte Stellung erneut einnimmt. Ein Schnellöffnungsvorgang ist also mithin auslösbar, sobald die Magnete Y1, Y2 erregt sind und die zugeordneten Magnetventile MV1 bzw. MV2 in ihre in Blickrichtung auf den Schaltplan gesehen linke Schaltstellung bringen.In contrast, the shuttle valves W1 and W2 via connection A of Solenoid valves MV1 to tank T 'without pressure, so that the pressure-free control connections X of the cartridge valves LETA and LEPB cause them to open with the result that the connection B of the actuating cylinder 10 to the hydraulic pump P ' is connected and the connection A to the tank T '. This leads to one Quick opening or retracting process, the actuating cylinder 10 in the Position shown in the circuit diagram again. There is a quick opening process can therefore be triggered as soon as the magnets Y1, Y2 are excited and the assigned ones Solenoid valves MV1 or MV2 in their direction of view of the circuit diagram seen left switch position.

In Abhängigkeit von der Verschaltung kann als Sicherheitsfunktion im umgekehrten Sinne auch ein Öffnungsvorgang ausgelöst werden. Auch in einem dahingehenden Fall würde die übliche Regelung und Schließfunktion durch diese höchste Priorität bei sicherer Ausführung dann überlagert werden.Depending on the connection, the safety function can be reversed An opening process can also be triggered. Even in one in this case, the usual regulation and closing function would this highest priority can then be overlaid with safe execution.

Claims (7)

  1. Safety circuit for activating a hydraulic drive (10) with a drive part (12) movable in at least two different traversing directions, which can be activated by a control system to traverse as required, at least one safety circuit (MV1, LEPA, LETB; MV2, LETA. LEPB) being hydraulically superimposed over the control system (MV3, LERA, LERB) with one control switching unit (MV3), the hydraulic fluid carrying outputs (A, B) of which are connected to a first pilot valve (LERA, LERB) respectively which makes connection to the drive part (12) or shuts it off, being controllable by a safety control unit (MV1) of a safety circuit for this purpose, characterized in that, to trigger a safety function by the drive part (12), the first safety control unit (MV1) activates the first pilot valve (LERA, LERB) to close the pressure-carrying connection P, and makes the pressure-carrying connection (P) to the hydraulic drive (10) via at least a second pilot valve (LEPA, LETB).
  2. Safety circuit according to Claim 1, characterized in that a second safety switching unit (MV2) of the safety circuit activates, together with the first safety unit (MV1). at least a third pilot valve (LETA, LEPB) which establishes the pressure-carrying connection for a movement of the drive part (12) which is in the opposite direction to the first safety function.
  3. Safety circuit according to Claim 1 or 2, characterized in that the hydraulic drive (10) is an operating cylinder, the double-acting piston of which forms the drive part (12), and that the control switching unit (MV3) is a 4/3-way valve or comprises pulse control.
  4. Safety circuit according to Claim 2 or 3, characterized in that each safety switching unit (MV1, MV2) is a 4/2-way valve which assumes the same position when energized or de-energised.
  5. Safety circuit according to one of the Claims 2 to 4, characterized in that each pilot valve (LERA. LERB, LEPA, LETB, LETA, LEPB) is formed of a cartridge valve, the respective control connection (X) of which co-acts with at least one output (A, B) of at least one of the safety control units (MV1, MV2).
  6. Safety circuit according to Claim 5, characterized in that at least some of the change-over valves (W1, W2, W3) are arranged between the respective outputs (A, B) of the respective safety circuit (MV1, MV2) and the associated cartridge valve.
  7. Safety circuit according to one of the Claims 4 to 6, characterized in that the first safety control unit (MV1) is de-energised for a rapid closing action, that the first safety control unit (MV1) and the second safety control unit (MV2) are energized for a rapid opening action and that the first safety control unit (MV1) co-acts with the control switching unit (MV3) in any traverse position, for controlled opening and closing with the drive part (12).
EP97901050A 1996-04-06 1997-01-17 Safety circuit Expired - Lifetime EP0890030B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19613848 1996-04-06
DE19613848A DE19613848C2 (en) 1996-04-06 1996-04-06 Safety circuit for controlling a hydraulic drive
PCT/EP1997/000189 WO1997038228A1 (en) 1996-04-06 1997-01-17 Safety circuit

Publications (2)

Publication Number Publication Date
EP0890030A1 EP0890030A1 (en) 1999-01-13
EP0890030B1 true EP0890030B1 (en) 2002-06-05

Family

ID=7790686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97901050A Expired - Lifetime EP0890030B1 (en) 1996-04-06 1997-01-17 Safety circuit

Country Status (8)

Country Link
EP (1) EP0890030B1 (en)
JP (1) JP2000508409A (en)
AT (1) ATE218677T1 (en)
CZ (1) CZ259398A3 (en)
DE (2) DE19613848C2 (en)
DK (1) DK0890030T3 (en)
SK (1) SK136898A3 (en)
WO (1) WO1997038228A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10050542B4 (en) * 2000-10-11 2004-11-04 Preh Gmbh Safety circuit against undesired commissioning of an automatic assembly machine, in particular during set-up, and method for switching on the safety circuit
DE10343088B4 (en) * 2003-09-17 2006-04-20 Liebherr-Aerospace Lindenberg Gmbh Method for checking a valve block for a consumer with two hydraulic supply systems

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931533C2 (en) * 1979-08-03 1984-09-13 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Servo control system
JPH063202B2 (en) * 1986-04-27 1994-01-12 三菱重工業株式会社 Failure neutral mechanism of electro-hydraulic servo actuator
DE3631104A1 (en) * 1986-09-12 1988-03-24 Rexroth Mannesmann Gmbh Safety circuit, in particular for a press
DE4131821C1 (en) * 1991-09-20 1992-08-13 Mannesmann Ag, 4000 Duesseldorf, De Pressure medium safety circuit for boiler lid handling - has extra safety valve coupled to valve system for switching in dependence on pressure threshold value
US5577876A (en) * 1994-02-22 1996-11-26 Clark Equipment Company Hydraulic interblock system
JPH08113197A (en) * 1994-10-17 1996-05-07 Kawasaki Heavy Ind Ltd Hydraulic control system switching circuit in steering engine

Also Published As

Publication number Publication date
DE59707427D1 (en) 2002-07-11
DE19613848A1 (en) 1997-10-09
ATE218677T1 (en) 2002-06-15
EP0890030A1 (en) 1999-01-13
DK0890030T3 (en) 2002-09-23
WO1997038228A1 (en) 1997-10-16
DE19613848C2 (en) 1998-04-09
JP2000508409A (en) 2000-07-04
CZ259398A3 (en) 1998-11-11
SK136898A3 (en) 1999-02-11

Similar Documents

Publication Publication Date Title
EP2638297B1 (en) Hydraulic or pneumatic drive for actuating a fitting comprising a control valve or selector valve
EP2220377B1 (en) Valve apparatus
EP3394454B1 (en) Valve, in particular a 4/2-way slide valve
DE3347000A1 (en) Electrohydraulic arrangement for controlling a double-acting hydraulic motor
EP0641919B1 (en) Safety valve arrangement
EP3178997B1 (en) Ventileinheit für schnellwechsler sowie schnellwechselsystem
DE3420631C2 (en)
EP0890030B1 (en) Safety circuit
EP1574720B1 (en) Electro-hydraulic control circuit and method of its deactivation
EP1114918B1 (en) Valve arrangement for an internal combustion engine and driving method
DE102017102307B3 (en) Motor vehicle with open passenger compartment
DE102021208330B3 (en) Hydraulic control arrangement
DE3736750C2 (en)
DE102021005824B4 (en) safety valve device
DE102021213469B3 (en) safety valve device
EP3436705B1 (en) Control device
DE102016212306A1 (en) Intermediate block and compact axle with an intermediate block
DE2149145C3 (en) Control system for gas pressure regulators
DE102022002037A1 (en) Hydraulic system
CH717506A2 (en) Method for actuating a lifting door in a machine tool and machine tool with a lifting door.
WO2017125121A1 (en) Circuit arrangement
DE3029432A1 (en) Fluid operating mechanism for rotary chuck - has cylinder piston defining opposite chuck opening and closing ends, normally biassed closed
DE1145493B (en) Device for controlling a periodically operating pressure medium-operated device
DE102008059560A1 (en) Hydraulic system for operating convertible hood device, has hydraulic actuator with two working chambers for actuating moving element of convertible hood device, particularly roof
CH705150A1 (en) Valve arrangement for hydraulic control system for controlling e.g. hydraulic cylinder for lifting extension arm of crane, has valve i.e. separate valve, connecting pressure connection and tank connection

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19980710

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE DK FI FR GB IT LI NL SE

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 20011112

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE DK FI FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 218677

Country of ref document: AT

Date of ref document: 20020615

Kind code of ref document: T

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: ISLER & PEDRAZZINI AG

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59707427

Country of ref document: DE

Date of ref document: 20020711

ET Fr: translation filed
ET Fr: translation filed
REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20030306

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20031205

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20031229

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20031230

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DK

Payment date: 20040115

Year of fee payment: 8

Ref country code: DE

Payment date: 20040115

Year of fee payment: 8

Ref country code: CH

Payment date: 20040115

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20040128

Year of fee payment: 8

Ref country code: FI

Payment date: 20040128

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20040130

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050117

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050117

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050117

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050117

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050118

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050131

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050131

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050801

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050802

EUG Se: european patent has lapsed
REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20050117

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050930

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20050801

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST