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EP0238782B1 - 5/3-way valve unit - Google Patents

5/3-way valve unit Download PDF

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Publication number
EP0238782B1
EP0238782B1 EP19860890351 EP86890351A EP0238782B1 EP 0238782 B1 EP0238782 B1 EP 0238782B1 EP 19860890351 EP19860890351 EP 19860890351 EP 86890351 A EP86890351 A EP 86890351A EP 0238782 B1 EP0238782 B1 EP 0238782B1
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EP
European Patent Office
Prior art keywords
control
valve unit
cylinder end
casing
slides
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
EP19860890351
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German (de)
French (fr)
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EP0238782A2 (en
EP0238782A3 (en
Inventor
Herbert Ing. Frisch
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.)
ENFO Grundlagen Forschungs AG
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ENFO Grundlagen Forschungs AG
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Publication of EP0238782A2 publication Critical patent/EP0238782A2/en
Publication of EP0238782A3 publication Critical patent/EP0238782A3/en
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Publication of EP0238782B1 publication Critical patent/EP0238782B1/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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves

Definitions

  • the invention relates to a 5/3-way valve unit for positioning a double-acting pneumatic cylinder, with a control element displaceable under the action of a control pressure against a restoring force in a controllable medium connections housing, which at control pressures below the pressure level required to overcome the restoring force in its zero position blocking all medium connections.
  • Valves are required for the controlled positioning of penumatic cylinders, the flow cross-sections of which must be very precise and easily adjustable in any intermediate position between zero and the maximum.
  • sealless spool valves are mostly used, which, due to their pressure-balanced design, can be operated with very little adjustment forces and, due to the air lubrication, also have very little friction.
  • the variant with a 5/3-way valve unit of the type mentioned at the outset has the advantage that the middle position is closed even when the position control is switched off; At the same time, however, there is also the disadvantage of a relatively large control air clearance, which is also inherent in the 3/3-way valves, which arises because the central position of the control element is in the middle of the control stroke due to the function, and which disadvantageously reduces the response speed of the proportional control valves.
  • the object of the present invention is to improve a valve unit of the type mentioned at the outset in such a way that the disadvantages of the known designs are avoided and, in particular, that there is a minimal control air clearance in the region around the zero position blocking all medium connections and a short response time to fluctuations in the control pressure in this area without great design effort and with high operational reliability.
  • control element is formed by two control slides arranged separately in the housing, each of which has two axially offset control edges which cooperate with two medium connections and can be acted upon separately with control pressure, the control edges of the first Control spool supply air of the first and exhaust air of the second cylinder side and the control edges of the second control spool Control the supply air on the second and exhaust air on the first cylinder side.
  • This division of the control element ensures in a very simple manner and while maintaining the above-mentioned advantageous feature of the 5/3-way valves that in the zero position of the control element there is only a very small control air damage space, which practically only results from the supply of the control pressure. Starting from this zero position, both control spools can be acted upon separately with control pressure, each of the two control spools being responsible for a direction of movement of the pneumatic cylinder or the working piston of this pneumatic cylinder.
  • a further advantage of the embodiment according to the invention is the possibility of a very compact design, since the two separate control spools can be accommodated in a compact housing much more easily than a conventional 5/3-way valve.
  • the two separate control slides are guided in insert bushes in the housing, which have control openings connected to the medium connections, and that both the control slide and the insert bushes are designed identically.
  • the two control slides are subjected to the restoring force from the housing via separate compression springs, which ensures complete independence of the movement of the two control slides from one another and allows a largely symmetrical configuration of the valve unit with respect to the two control slides.
  • the two control slides are arranged parallel to one another in the housing and that the connections for the control pressure are each on the same housing side.
  • this also provides simplified connection and assembly conditions, which offers great advantages, in particular in connection with, for example, a direct attachment of the valve unit according to the invention to the cylinder to be controlled.
  • the control openings for the supply air and for the exhaust air can be provided for both cylinder sides at substantially the same intervals for connection to the positions for the control pressure in the housing of the valve unit, which greatly simplifies the routing of the necessary connecting lines between the two separate control slides.
  • pilot valves are placed directly on the connections for the control pressure on the housing. In this way it is ensured that the small control air harmful space made possible with the design according to the invention can be fully used and is not reduced by longer connecting lines to the pilot valves.
  • Fig. 1 shows a circuit diagram for positioning a double-acting pneumatic cylinder with a valve unit according to the invention
  • Fig. 2 shows an embodiment of a valve unit according to the invention in section.
  • the double-acting pneumatic cylinder 1 essentially consists of a cylinder 2 and a piston 3 axially guided therein, which is connected to a piston rod 4 which extends out of the cylinder 2.
  • the valve unit 9, which enables the positioning of the pneumatic cylinder 1 by controlling the supply and exhaust air of the two cylinder sides 5, 6, has a control element which is displaceable in a housing 10 and is here formed by two separate control slides 11, 12 and which acts under the influence of the inputs X and Y applied control pressure against the force of two separate compression springs 13, 14 is displaceable and controls five medium connections.
  • P is the connection for the uncontrolled pressure medium, ie the supply air to both cylinder sides; Instead of the separate connections P here, of course, a common one could also be provided for both control slides.
  • R the connection for the exhaust air from the second cylinder side 6 - ie from the cover side - is designated.
  • S denotes the connection for the exhaust air from the first cylinder side 5; A and B are already referred to above as connections leading directly to the cylinder sides.
  • the two control spools 11, 12 are shown in the circuit diagram of Fig. 1 as 4/2-way valves and also act accordingly - but equivalent is a response of these spool as two mechanically coupled 2/2-way valves, as explained in more detail below 2 comes closer.
  • the valve unit 9 the following should only be mentioned briefly: In the zero position of the control element or the two control slides 11, 12 shown in FIG. 1, all five controllable medium connections A, B, P, S, R are under the action of both Compression springs 13, 14 shut off, whereby the two cylinder sides 5, 6 are closed to the outside and the piston 3 - depending on the pressure level - is held more or less firmly in its position.
  • the two control slides 11, 12 can be acted upon independently by control pressure via the separate inputs X and Y and can each control the movement of the piston 3 in one direction by different joint, simultaneous action on the two cylinder sides, for example the braking of the piston 3 when approaching its target position or bracing at this target position can be achieved with very simple means.
  • control slides 11, 12 used in the housing bores 34 together with the insert bushes 15, 16 are supported by separate compression springs 13, 14 on a lower housing cover 35 and are pressed into their zero position under the action of these compression springs, in which they rest on an upper housing cover 36.
  • Two axially offset control edges 37, 38 and 39, 40 are arranged on each of the two control spools 11, 12, which more or less release the opening cross section of the control openings 20, 22, 23, depending on the axial position of the control spools.
  • 36 inlet bores for the connections X, Y for the respective control pressure are made in the upper housing cover.
  • control pressure is applied to the inlet Y, whereby the first control edge 39 opens the control openings 23 and the second control edge 40 opens the control openings 20 and the exhaust air connection 5 is connected to the first cylinder side 5 and the pressure connection P to the second cylinder side 6.
  • the actuation of the two control slides 11, 12 can, however, also take place together, so that differentiated movement or pressure conditions can be realized on both cylinder sides depending on the control pressure applied on both sides.
  • Pilot valves for the control pressure could also be attached directly to the inputs X, Y for the control pressure, which means that there is very little clearance for the control pressure, especially in the delicate area around the zero position of the two control spools, and a very quick response to changes in the control pressure, which is particularly the case the vicinity of the zero crossing is very advantageous for precise positioning.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft eine 5/3-Wege-Ventileinheit zum Positionieren eines doppelt wirkenden Pneumatikzylinders, mit einem unter Einwirkung eines Steuerdruckes gegen eine Rückstellkraft in einem steuerbare Medium-Anschlüsse aufweisenden Gehäuse verschieblichen Steuerelement, welches sich bei Steuerdrücken unterhalb des zur Überwindung der Rückstellkraft erforderlichen Druckniveaus in seiner alle Medium-Anschlüsse sperrenden Nullstellung befindet.The invention relates to a 5/3-way valve unit for positioning a double-acting pneumatic cylinder, with a control element displaceable under the action of a control pressure against a restoring force in a controllable medium connections housing, which at control pressures below the pressure level required to overcome the restoring force in its zero position blocking all medium connections.

Zum geregelten Positionieren von Penumatikzylindern sind Ventile erforderlich, deren Durchgangsquerschnitte zwischen Null und dem Maximum in jeder Zwischenstellung sehr genau und leicht einstellbar sein müssen. Dazu werden heutzutage zumeist sogenannte dichtungslose Kolbenschieber eingesetzt, die zufolge ihrer druckausgeglichenen Bauart mit sehr geringen Verstellkräften betätigt werden können und wegen der Luftschmierung auch nur sehr geringe Reibung aufweisen.Valves are required for the controlled positioning of penumatic cylinders, the flow cross-sections of which must be very precise and easily adjustable in any intermediate position between zero and the maximum. These days, so-called sealless spool valves are mostly used, which, due to their pressure-balanced design, can be operated with very little adjustment forces and, due to the air lubrication, also have very little friction.

Zum Positionieren eines doppelt wirkenden Pneumatikzylinders sind verschiedene Ansteuerungsmöglichkeiten der Zuund Abläufe des Druckmediums auf beiden Kolbenseiten erforderlich, die überlicherweise über vier 2/2, zwei 3/3 oder über ein 5/3-Wegeventil (mit geschlossenen Mittelstellungen) realisiert werden. Beim Einsatz von 2/2-Wegeventilen, die auch von Sitzventilen gebildet werden können, erhält man zwar eine flexible und vielfältige Ansteuermöglichkeiten bietende Ausführung, welche aber den Nachteil eines sehr hohen Geräteaufwandes hat. Bei Verwendung von zwei Stück 3/3-Wegeventilen, von denen eines deckelseitig und eines bodenseitig wirkt, ergibt sich bei vereinfachter Ansteuerung der Nachteil, daß die Regelung auch nach dem Erreichen der gewünschten Position des Kolbens nicht abgeschaltet werden darf, wenn das Druckmedium im Zylinder vorgespannt bleiben soll, was zumeist schon für ein schnelles Ansprechen erforderlich ist. Bei der Variante mit einer 5/3-Wege-Ventileinheit der eingangs genannten Art ist der Vorteil gegeben, daß die Mittelstellung auch bei abgeschalteter Positionsregelung geschlossen ist; gleichzeitig tritt aber der auch den 3/3-Wegeventilen anhaftende Nachteil eines relativ großen Steuerluft-Schadraumes auf, der deshalb entsteht, weil die Mittelstellung des Steuerelements funktionsbedingt in der Mitte des Steuerhubes liegt, und der die Ansprechgeschwindigkeit der Proportionalsteuerventile sehr unvorteilhaft reduziert.To position a double-acting pneumatic cylinder, various control options for the inflows and outflows of the pressure medium on both piston sides are required, which are usually implemented using four 2/2, two 3/3 or a 5/3 directional control valve (with closed middle positions). When using 2/2-way valves, which can also be formed by poppet valves, you get a flexible and diverse control options, but this has the disadvantage of a very high amount of equipment. When using two 3/3-way valves, one of which acts on the cover side and one on the base side, the disadvantage arises with simplified control that the regulation also follows the reaching of the desired position of the piston must not be switched off if the pressure medium is to remain biased in the cylinder, which is usually already necessary for a quick response. The variant with a 5/3-way valve unit of the type mentioned at the outset has the advantage that the middle position is closed even when the position control is switched off; At the same time, however, there is also the disadvantage of a relatively large control air clearance, which is also inherent in the 3/3-way valves, which arises because the central position of the control element is in the middle of the control stroke due to the function, and which disadvantageously reduces the response speed of the proportional control valves.

Aufgabe der vorliegenden Erfindung ist es, eine Ventileinheit der eingangs genannten Art so zu verbessern, daß die genannten Nachteile der bekannten Ausführungen vermieden werden und daß insbesonders ein minimaler Steuerluft-Schadraum im Bereich um die alle Medium-Anschlüsse sperrende Nullstellung sowie eine kurze Ansprechzeit auf Schwankungen im Steuerdruck in diesem Bereich ohne großen konstruktiven Aufwand und mit hoher Betriebssicherheit möglich wird.The object of the present invention is to improve a valve unit of the type mentioned at the outset in such a way that the disadvantages of the known designs are avoided and, in particular, that there is a minimal control air clearance in the region around the zero position blocking all medium connections and a short response time to fluctuations in the control pressure in this area without great design effort and with high operational reliability.

Diese Aufgabe wird gemäß der vorliegenden Erfindung dadurch gelöst, daß das Steuerelement von zwei separat im Gehäuse angeordneten Steuerschiebern gebildet ist, welche jeweils zwei mit je zwei Medium-Anschlüssen zusammenwirkende, axial versetzte Steuerkanten aufweisen und separat mit Steuerdruck beaufschlagbar sind, wobei die Steuerkanten des ersten Steuerschiebers Zuluft der ersten und Abluft der zweiten Zylinderseite und die Steuerkanten des zweiten Steuerschiebers Zuluft der zweiten und Abluft der ersten Zylinderseite steuern. Durch diese Aufteilung des Steuerelements ist auf sehr einfache Weise und unter Beibehaltung des oben genannten vorteilhaften Merkmals der 5/3-Wegeventile erreicht, daß in der Nullstellung des Steuerelements nur ein sehr geringer SteuerluftSchadraum vorliegt, welcher praktisch nur von der Zuleitung des Steuerdrucks herrührt. Ausgehend von dieser Nullstellung sind beide Steuerschieber separat mit Steuerdruck beaufschlagbar, wobei jeder der beiden Steuerschieber für eine Bewegungsrichtung des Pneumatikzylinders bzw. des Arbeitskolbens dieses Pneumatikzylinders zuständig ist.This object is achieved in accordance with the present invention in that the control element is formed by two control slides arranged separately in the housing, each of which has two axially offset control edges which cooperate with two medium connections and can be acted upon separately with control pressure, the control edges of the first Control spool supply air of the first and exhaust air of the second cylinder side and the control edges of the second control spool Control the supply air on the second and exhaust air on the first cylinder side. This division of the control element ensures in a very simple manner and while maintaining the above-mentioned advantageous feature of the 5/3-way valves that in the zero position of the control element there is only a very small control air damage space, which practically only results from the supply of the control pressure. Starting from this zero position, both control spools can be acted upon separately with control pressure, each of the two control spools being responsible for a direction of movement of the pneumatic cylinder or the working piston of this pneumatic cylinder.

Als weiterer Vorteil der erfindungsgemäßen Ausführung ist schließlich noch die Möglichkeit einer sehr kompakten Bauweise zu nennen, da die beiden separaten Steuerschieber sehr viel leichter in einem kompakten Gehäuse untergebracht werden können als ein übliches 5/3-Wegeventil.Finally, a further advantage of the embodiment according to the invention is the possibility of a very compact design, since the two separate control spools can be accommodated in a compact housing much more easily than a conventional 5/3-way valve.

Gemäß einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß die beiden separaten Steuerschieber in Einsatzbüchsen im Gehäuse geführt sind, welche mit den MediumAnschlüssen in Verbindung stehende Steueröffnungen aufweisen und daß sowohl die Steuerschieber als auch die Einsatzbüchsen identisch ausgeführt sind. Damit können die zumindest bei Proportionalventilen erhöhte Genauigkeit erfordernden Steuerteile kostengünstiger hergestellt werden; die die Verbindung der Medium-Anschlüsse zu den Steueröffnungen herstellenden Leitungen im Gehäuse erfordern keine besondere Genauigkeit und können somit beispielsweise bei der Herstellung des Gehäuses mitgegossen oder mitgeformt werden.According to a further embodiment of the invention, it is provided that the two separate control slides are guided in insert bushes in the housing, which have control openings connected to the medium connections, and that both the control slide and the insert bushes are designed identically. This means that the accuracy required, at least in the case of proportional valves, can be increased Control parts are manufactured more cost-effectively; the lines in the housing which connect the medium connections to the control openings do not require any particular accuracy and can thus be cast or molded, for example, during the manufacture of the housing.

Die beiden Steuerschieber sind nach einer weiteren Ausgestaltung der Erfindung über separate Druckfedern vom Gehäuse her mit der Rückstellkraft beaufschlagt, was eine komplette Unabhängigkeit der Bewegung der beiden Steuerschieber voneinander sicherstellt und eine weitgehend symmetrische Ausgestaltung der Ventileinheit bezüglich der beiden Steuerschieber erlaubt.According to a further embodiment of the invention, the two control slides are subjected to the restoring force from the housing via separate compression springs, which ensures complete independence of the movement of the two control slides from one another and allows a largely symmetrical configuration of the valve unit with respect to the two control slides.

Nach einer besonders bevorzugten Ausführung der Erfindung ist vorgesehen, daß die beiden Steuerschieber parallel nebeneinander im Gehäuse angeordnet sind und daß die Anschlüsse für den Steuerdruck jeweils auf der gleichen Gehäuseseite liegen. Damit sind neben einer vereinfachten Herstellung auch vereinfachte Anschluß- bzw. Montagebedingungen gegeben, was insbesonders im Zusammenhang beispielsweise mit einem direkten Anbau der erfindungsgemäßen Ventileinheit an den zu steuernden Zylinder große Vorteile bietet.According to a particularly preferred embodiment of the invention, it is provided that the two control slides are arranged parallel to one another in the housing and that the connections for the control pressure are each on the same housing side. In addition to simplified production, this also provides simplified connection and assembly conditions, which offers great advantages, in particular in connection with, for example, a direct attachment of the valve unit according to the invention to the cylinder to be controlled.

Nach einer anderen Weiterbildung der Erfindung ist vorgesehen, daß  ―  jeweils ausgehend von der Seite des Anschlusses für den Steuerdruck  ―  die erste Steuerkante des ersten Steuerschiebers die Abluft der zweiten Zylinderseite, die zweite Steuerkante des ersten Steuerschiebers die Zuluft der ersten Zylinderseite, die erste Steuerkante des zweiten Steuerschiebers die Abluft der ersten Zylinderseite, und die zweite Steuerkante des zweiten Steuerschiebers die Zuluft der zweiten Zylinderseite steuert. Auf diese Weise können die Steueröffnungen für die Zuluft und für die Abluft jeweils für beide Zylinderseiten im wesentlichen in gleiche Abstände zum Anschluß für den Steuerdruck aufweisenden Positionen im Gehäuse der Ventileinheit vorgesehen werden, was die Führung der nötigen Verbindungsleitungen zwischen den beiden separaten Steuerschiebern sehr vereinfacht.According to another development of the invention it is provided that - starting from the side of the connection for the control pressure - the first control edge of the first control slide the exhaust air of the second cylinder side, the second control edge of the first control slide the supply air of the first cylinder side, the first control edge of the second control slide the exhaust air of the first cylinder side, and the second control edge of the second control slide the supply air of the second Controls cylinder side. In this way, the control openings for the supply air and for the exhaust air can be provided for both cylinder sides at substantially the same intervals for connection to the positions for the control pressure in the housing of the valve unit, which greatly simplifies the routing of the necessary connecting lines between the two separate control slides.

Zur separaten Beaufschlagung beider Steuerschieber mit Steuerdruck kann gemäß einer besonders bevorzugten weiteren Ausbildung der Erfindung vorgesehen sein, daß Pilotventile unmittelbar an den Anschlüssen für den Steuerdruck am Gehäuse aufgesetzt sind. Auf diese Weise ist sichergestellt, daß der mit der erfindungsgemäßen Ausführung ermöglichte geringe Steuerluft-Schadraum voll genutzt werden kann und nicht durch längere Verbindungsleitungen zu den Pilotventilen geschmälert wird.In order to apply control pressure to both control spools separately, it can be provided according to a particularly preferred further embodiment of the invention that pilot valves are placed directly on the connections for the control pressure on the housing. In this way it is ensured that the small control air harmful space made possible with the design according to the invention can be fully used and is not reduced by longer connecting lines to the pilot valves.

Die Erfindung wird im folgenden an Hand der teilweise schematisch dargestellten Ausführungsbeispiele in der Zeichnung näher erläutert. Fig. 1 zeigt ein Schaltschema zum Positionieren eines doppelt wirkenden Pneumatikzylinders mit einer erfindungsgemäßen Ventileinheit und Fig. 2 zeigt ein Ausführungsbeispiel einer Ventileinheit nach der Erfindung im Schnitt.The invention is explained below with reference to the partially schematically illustrated embodiments in the drawing. Fig. 1 shows a circuit diagram for positioning a double-acting pneumatic cylinder with a valve unit according to the invention and Fig. 2 shows an embodiment of a valve unit according to the invention in section.

Der doppelt wirkende Pneumatikzylinder 1 nach Fig. 1 besteht im wesentlichen aus einem Zylinder 2 und einem darin axial geführten Kolben 3, der mit einer aus dem Zylinder 2 herausgeführten Kolbenstange 4 verbunden ist. An einer ersten Zylinderseite 5 und an einer zweiten Zylinderseite 6 sind Anschlußleitungen 7, 8 für Druckmedium, insbesonders Druckluft, vorgesehen, welche mit Anschlüssen A bzw. B an einer 5/3-Wege-Ventileinheit 9 in Verbindung stehen.The double-acting pneumatic cylinder 1 according to FIG. 1 essentially consists of a cylinder 2 and a piston 3 axially guided therein, which is connected to a piston rod 4 which extends out of the cylinder 2. On a first cylinder side 5 and on a second cylinder side 6 there are connecting lines 7, 8 for pressure medium, in particular compressed air, provided, which are connected to connections A and B on a 5/3-way valve unit 9.

Die durch Steuern der Zu- bzw. Abluft der beiden Zylinderseiten 5, 6 das Positionieren des Pneumatikzylinders 1 ermöglichende Ventileinheit 9 weist ein in einem Gehäuse 10 verschiebliches, hier von zwei separaten Steuerschiebern 11, 12 gebildetes Steuerelement auf, welches unter Einwirkung von an den Eingängen X und Y angelegtem Steuerdruck gegen die Kraft von zwei separaten Druckfedern 13, 14 verschieblich ist und dabei fünf Medium-Anschlüsse steuert. Mit P ist der Anschluß für das ungesteuerte Druckmedium, also die Zuluft zu beiden Zylinderseiten, bezeichnet; anstelle der hier getrennten Anschlüsse P könnte natürlich aber auch ein gemeinsamer für beide Steuerschieber vorgesehen sein. Mit R ist der Anschluß für die Abluft von der zweiten Zylinderseite 6  ―  also von der Deckelseite  ―  bezeichnet. S bezeichnet den Anschluß für die Abluft von der ersten Zylinderseite 5; A und B sind bereits oben als direkt zu den Zylinderseiten führende Anschlüsse bezeichnet.The valve unit 9, which enables the positioning of the pneumatic cylinder 1 by controlling the supply and exhaust air of the two cylinder sides 5, 6, has a control element which is displaceable in a housing 10 and is here formed by two separate control slides 11, 12 and which acts under the influence of the inputs X and Y applied control pressure against the force of two separate compression springs 13, 14 is displaceable and controls five medium connections. P is the connection for the uncontrolled pressure medium, ie the supply air to both cylinder sides; Instead of the separate connections P here, of course, a common one could also be provided for both control slides. With R the connection for the exhaust air from the second cylinder side 6 - ie from the cover side - is designated. S denotes the connection for the exhaust air from the first cylinder side 5; A and B are already referred to above as connections leading directly to the cylinder sides.

Die beiden Steuerschieber 11, 12 sind im Schaltschema nach Fig. 1 als 4/2-Wegeventile dargestellt und wirken auch entsprechend  ―  gleichwertig ist aber ein Ansprechen dieser Steuerschieber als jeweils zwei mechanisch gekoppelte 2/2-Wegeventile, wie dies der unten noch näher erläuterten Ausführung nach Fig. 2 näher kommt. Zur Funktion der Ventileinheit 9 ist nur kurz das folgende zu erwähnen: In der in Fig. 1 dargestellten Nullstellung des Steuerelements bzw. der beiden Steuerschieber 11, 12 sind alle fünf steuerbaren Medium-Anschlüsse A, B, P, S, R unter der Wirkung der beiden Druckfedern 13, 14 abgesperrt, womit auch die beiden Zylinderseiten 5, 6 nach außen abgeschlossen sind und der Kolben 3  ―  je nach Druckniveau  ―  mehr oder weniger fest in seiner Position gehalten wird. Wird beispielsweise der erste Steuerschieber 11 durch einen die Kraft der Druckfeder 13 überwindenden Steuerdruck am Eingang X aus der sperrenden Nullstellung bewegt, so wird der Zuluftanschluß P zur ersten Zylinderseite 5 und der Abluftanschluß R von der zweiten Zylinderseite 6 in einem dem Ausmaß der Verstellung des Steuerschiebers 11 entsprechenden Ausmaß geöffnet und der Kolben 3 in der Darstellung nach rechts verschoben. Zur Bewegung des Kolbens 3 in die andere Richtung muß der beschriebene Steuervorgang durch Anlegung von Steuerdruck am Eingang Y des zweiten Steuerschiebers 12 eingeleitet werden. Da die beiden Steuerschieber 11, 12 über die separaten Eingänge X und Y voneinander unabhängig mit Steuerdruck beaufschlagbar sind und je für sich die Bewegung des Kolbens 3 in eine Richtung kontrollieren kann durch unterschiedliche gemeinsame, gleichzeitige Beaufschlagung der beiden Zylinderseiten auch beispielsweise das Abbremsen des Kolbens 3 bei Annäherung an seine Sollposition oder ein Verspannen an dieser Sollposition mit sehr einfachen Mitteln erreicht werden.The two control spools 11, 12 are shown in the circuit diagram of Fig. 1 as 4/2-way valves and also act accordingly - but equivalent is a response of these spool as two mechanically coupled 2/2-way valves, as explained in more detail below 2 comes closer. For the function of the valve unit 9, the following should only be mentioned briefly: In the zero position of the control element or the two control slides 11, 12 shown in FIG. 1, all five controllable medium connections A, B, P, S, R are under the action of both Compression springs 13, 14 shut off, whereby the two cylinder sides 5, 6 are closed to the outside and the piston 3 - depending on the pressure level - is held more or less firmly in its position. If, for example, the first control slide 11 is moved from the blocking zero position by a control pressure at the inlet X which overcomes the force of the compression spring 13, the supply air connection P to the first cylinder side 5 and the exhaust air connection R from the second cylinder side 6 become the extent of the adjustment of the control slide 11 corresponding extent opened and the piston 3 moved to the right in the illustration. To move the piston 3 in the other direction, the control process described must be initiated by applying control pressure to the input Y of the second control slide 12. Since the two control slides 11, 12 can be acted upon independently by control pressure via the separate inputs X and Y and can each control the movement of the piston 3 in one direction by different joint, simultaneous action on the two cylinder sides, for example the braking of the piston 3 when approaching its target position or bracing at this target position can be achieved with very simple means.

Zur Beschreibung der Ausführung nach Fig. 2 werden im folgenden gleiche Bezugszeichen wie zu Fig. 1 verwendet, soweit nur die Funktion der entsprechenden Teile gleich ist.To describe the embodiment according to FIG. 2, the same reference numerals are used in the following as for FIG. 1, insofar as only the function of the corresponding parts is the same.

Im Gehäuse 10 der Ausführung nach Fig. 2 sind zwei Steuerschieber 11, 12 in Einsatzbüchsen 15, 16 geführt, wobei diese Einsatzbüchsen mit den Medium-Anschlüssen A, B, S, P, R in Verbindung stehende Steueröffnungen 17, 18, 19, 20, 21, 22 und 23 aufweisen. Diese Steueröffnungen können in Form von Schlitzen oder auch in Form von mehreren am Umfang der Einsatzbüchsen 15, 16 verteilten einzelnen Bohrungen ausgeführt sein und gehen von Ringräumen 24 am Außenumfang der Einsatzbüchsen aus. Zur erforderlichen Verbindung der Ringräume 24 mit den jeweiligen Anschlüssen sind im Gehäuse Leitungen 25 bis 32 vorgesehen, die an der Außenseite des Gehäuses jeweils in Schraubanschlüsse 33 münden.2, two control slides 11, 12 are guided in insert bushes 15, 16, these insert bushes being connected to the control ports 17, 18, 19, 20 with the medium connections A, B, S, P, R , 21, 22 and 23. These control openings can take the form of slots or also in the form of a plurality of individual bores distributed around the circumference of the insert bushes 15, 16 and proceed from annular spaces 24 on the outer circumference of the insert bushes. For the necessary connection of the annular spaces 24 to the respective connections, lines 25 to 32 are provided in the housing, which each lead to screw connections 33 on the outside of the housing.

Die zusammen mit den Einsatzbüchsen 15, 16 in Gehäusebohrungen 34 eingesetzten Steuerschieber 11, 12 sind mit separaten Druckfedern 13, 14 an einem unterem Gehäusedeckel 35 abgestützt und werden unter Wirkung dieser Druckfedern in ihre Nullstellung gedrückt, in der sie an einem oberen Gehäusedeckel 36 anliegen. An beiden Steuerschiebern 11, 12 sind je zwei axial versetzte Steuerkanten 37, 38 bzw. 39, 40 angeordnet, die den Öffnungsquerschnitt der Steueröffnungen 20, 22, 23 je nach axialer Stellung der Steuerschieber mehr oder weniger freigeben. Zur Einleitung einer axialen Bewegung der Steuerschieber 11, 12 gegen die Kraft der Druckfedern 13, 14 sind im oberen Gehäusedeckel 36 Einlaßbohrungen 41 für die Anschlüsse X, Y für den jeweiligen Steuerdruck angebracht.The control slides 11, 12 used in the housing bores 34 together with the insert bushes 15, 16 are supported by separate compression springs 13, 14 on a lower housing cover 35 and are pressed into their zero position under the action of these compression springs, in which they rest on an upper housing cover 36. Two axially offset control edges 37, 38 and 39, 40 are arranged on each of the two control spools 11, 12, which more or less release the opening cross section of the control openings 20, 22, 23, depending on the axial position of the control spools. In order to initiate an axial movement of the control slide 11, 12 against the force of the compression springs 13, 14, 36 inlet bores for the connections X, Y for the respective control pressure are made in the upper housing cover.

In der in Fig. 2 dargestellten Stellung der beiden Steuerschieber 11, 12 liegt kein Steuerdruck an den Eingängen X, Y an; die mit dem Zuluftanschluß P in Verbindung stehenden Steueröffnungen 20 sind von den zweiten Steuerkanten 38, 40 beider Steuerschieber 11, 12 abgeschlossen. Gleiches gilt für die Steueröffnungen 22, 23, welche über die Leitungen 26, 28 mit den Anschlüssen A, B in Verbindung stehen und von den Steuerkanten 37, 39 abgeschlossen werden. Damit sind beide Zylinder seiten  ―  5, 6 in Fig. 1  ―  von der Ventileinheit 9 abgeschlossen. Wird beispielsweise über den Eingang X Steuerdruck auf den ersten Steuerschieber 11 gelegt, so öffnet die erste Steuerkante 37 die Steueröffnungen 22 und verbindet damit den Abluftanschluß R mit dem Anschluß B zur zweiten Zylinderseite 6. Gleichzeitig wird mit der mechanisch starr gekoppelten zweiten Steuerkante 38 eine Öffnung der Steueröffnungen 20 bewirkt, womit der Druckluftanschluß P über die Steueröffnungen 17 mit dem Anschluß A zur ersten Zylinderseite 5 verbunden ist. Damit bewegt sich der Kolben 3  ―  wiederum in Fig. 1  ―  nach rechts.In the position of the two control slides 11, 12 shown in FIG. 2, there is no control pressure at the inputs X, Y; the control openings 20 connected to the supply air connection P are closed off by the second control edges 38, 40 of both control slides 11, 12. The same applies to the control openings 22, 23, which are connected to the connections A, B via the lines 26, 28 and are closed off by the control edges 37, 39. So that both cylinders are pages - 5, 6 in Fig. 1 - completed by the valve unit 9. If, for example, control pressure is applied to the first control slide 11 via the input X, the first control edge 37 opens the control openings 22 and thus connects the exhaust air connection R to the connection B to the second cylinder side 6. At the same time, an opening becomes with the mechanically rigidly coupled second control edge 38 of the control openings 20, whereby the compressed air connection P is connected via the control openings 17 to the connection A to the first cylinder side 5. The piston 3 thus moves - again in FIG. 1 - to the right.

Zur Einleitung der umgekehrten Kolbenbewegung wird am Einang Y Steuerdruck angelegt, womit die erste Steuerkante 39 die Steueröffnungen 23 und die zweite Steuerkante 40 die Steueröffnungen 20 öffnet und der Abluftanschluß 5 mit der ersten Zylinderseite 5 und der Druckanschluß P mit der zweiten Zylinderseite 6 verbunden wird. Die Betätigung der beiden Steuerschieber 11, 12 kann aber auch gemeinsam erfolgen, womit je nach dem jeweils auf beiden Seiten angelegten Steuerdruck differenzierte Bewegungs- bzw. Druckverhältnisse auf beiden Zylinderseiten realisiert werden können.To initiate the reverse piston movement, control pressure is applied to the inlet Y, whereby the first control edge 39 opens the control openings 23 and the second control edge 40 opens the control openings 20 and the exhaust air connection 5 is connected to the first cylinder side 5 and the pressure connection P to the second cylinder side 6. The actuation of the two control slides 11, 12 can, however, also take place together, so that differentiated movement or pressure conditions can be realized on both cylinder sides depending on the control pressure applied on both sides.

Unmittelbar an den Eingängen X, Y für den Steuerdruck könnten auch Pilotventile für den Steuerdruck aufgesetzt sein, womit ein sehr geringer Schadraum für den Steuerdruck insbesonders im heiklen Bereich um die Nullstellung der beiden Steuerschieber und ein sehr schnelles Ansprechen auf Steuerdruckänderungen erreicht ist, was besonders in der Nähe des Nulldurchgangs zum genauen Positionieren sehr vorteilhaft ist.Pilot valves for the control pressure could also be attached directly to the inputs X, Y for the control pressure, which means that there is very little clearance for the control pressure, especially in the delicate area around the zero position of the two control spools, and a very quick response to changes in the control pressure, which is particularly the case the vicinity of the zero crossing is very advantageous for precise positioning.

Claims (6)

1. A 5/3-way valve unit for positioning a double-acting pneumatic cylinder (2, 3), having a control element (11, 12) which is displaceable under the action of a control pressure against a restoring force in a casing (10) comprising controllable medium connexions and which at control pressures below the pressure level required for overcoming the restoring force is present in its zero position blocking all the medium connexions, characterized in that the control element is formed by two control slides (11, 12) which are arranged separately in the casing (10) and which each comprise two axially offset control edges (37, 38 and 39, 40 respectively) each cooperating with two medium connexions (A, B, S, P, R) and which can be acted upon separately by control pressure, the control edges (37, 38) of the first control slide (11) controlling supply air to the first cylinder end (5) and discharge air from the second cylinder end (6) and the control edges (39, 40) of the second control slide (12) controlling supply air to the second cylinder end (6) and discharge air from the first cylinder end (5).
2. A valve unit according to Claim 1, characterized in that the two separate control slides (11, 12) are guided in insert bushes (15, 16) in the casing (10), the insert bushes (15, 16) comprising control openings (17 to 23) connected to the medium connexions (A, B, S, P, R), and both the control slides (11, 12) and the insert bushes (15, 16) are constructed identically.
3. A valve unit according to Claim 1 or 2, characterized in that the two control slides (11, 12) are acted upon with the restoring force from the casing (10) by way of separate compression springs (13, 14).
4. A valve unit according to any one of Claims 1 to 3, characterized in that the two control slides (11, 12) are arranged parallel beside each other in the casing (10), and the connexions (X, Y) for the control pressure are each disposed on the same side of the casing.
5. A valve unit according to any one of Claims 1 to 4, characterized in that  ―  starting in each case from the side of the connexion (X, Y) for the control pressure  ―  the first control edge (37) of the first control slide (11) controls the discharge air from the second cylinder end (6), the second control edge (38) of the first control slide (11) controls the supply air to the first cylinder end (5), the first control edge (39) of the second control slide (12) controls the discharge air from the first cylinder end (5), and the second control edge (40) of the second control slide (12) controls the supply air to the second cylinder end (6).
6. A valve unit according to any one of Claims 1 to 5, characterized in that pilot valves are mounted directly on the connexions for the control pressure on the casing in order to act upon the two control slides separately.
EP19860890351 1985-12-30 1986-12-19 5/3-way valve unit Expired - Lifetime EP0238782B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT377485A AT391178B (en) 1985-12-30 1985-12-30 5/3-WAY VALVE UNIT
AT3774/85 1985-12-30

Publications (3)

Publication Number Publication Date
EP0238782A2 EP0238782A2 (en) 1987-09-30
EP0238782A3 EP0238782A3 (en) 1988-02-10
EP0238782B1 true EP0238782B1 (en) 1991-07-17

Family

ID=3555245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860890351 Expired - Lifetime EP0238782B1 (en) 1985-12-30 1986-12-19 5/3-way valve unit

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EP (1) EP0238782B1 (en)
JP (1) JPH0660697B2 (en)
CN (1) CN1010242B (en)
AT (1) AT391178B (en)
DE (1) DE3680324D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5921279A (en) * 1998-04-29 1999-07-13 Husco International, Inc. Solenoid operated dual spool control valve
US7114521B2 (en) * 2003-09-03 2006-10-03 Ross Operating Valve Company Double valve constructed from unitary single valves
CN1295440C (en) * 2004-03-08 2007-01-17 尚继良 Integrated manual multiple directional control valve for lader
DE102008054977B4 (en) * 2008-12-19 2014-01-23 Zf Friedrichshafen Ag switching arrangement
US8794123B2 (en) * 2010-03-12 2014-08-05 Ross Operating Valve Company Double valve constructed from unitary single valves
CN105697441A (en) * 2016-01-08 2016-06-22 洪子云 Hydraulic travel automatic reversing valve and hydraulic control system of rotating pump hole forming pile machine
CN107830212B (en) * 2017-11-30 2024-03-26 安徽中捷矿山运输设备有限责任公司 Three-position five-way air control reversing valve
CN110530074B (en) * 2019-08-30 2021-01-19 杭州师范大学钱江学院 Six-way valve, heat exchange system based on six-way valve and heat exchange method of heat exchange system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709244A (en) * 1970-11-04 1973-01-09 H Zadow Free foil flow control device
BE789975A (en) * 1971-10-12 1973-02-01 Sanders Associates Inc PRESSURE AND FLOW CONTROL VALVE
GB1600155A (en) * 1977-02-28 1981-10-14 Budzich Tadeusz Load responsive fluid control valve
US4349041A (en) * 1979-08-20 1982-09-14 Nl Industries, Inc. Control valve system for blowout preventers
US4461449A (en) * 1980-05-01 1984-07-24 The Boeing Company Integral hydraulic blocking and relief valve

Also Published As

Publication number Publication date
EP0238782A2 (en) 1987-09-30
AT391178B (en) 1990-08-27
CN1010242B (en) 1990-10-31
JPS62237180A (en) 1987-10-17
CN86108885A (en) 1987-09-23
ATA377485A (en) 1990-02-15
EP0238782A3 (en) 1988-02-10
JPH0660697B2 (en) 1994-08-10
DE3680324D1 (en) 1991-08-22

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