EP0311792A2 - Pumping arrangement for the simultaneous feeding of two liquids to a spray apparatus - Google Patents

Pumping arrangement for the simultaneous feeding of two liquids to a spray apparatus Download PDF

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Publication number
EP0311792A2
EP0311792A2 EP88114826A EP88114826A EP0311792A2 EP 0311792 A2 EP0311792 A2 EP 0311792A2 EP 88114826 A EP88114826 A EP 88114826A EP 88114826 A EP88114826 A EP 88114826A EP 0311792 A2 EP0311792 A2 EP 0311792A2
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EP
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Prior art keywords
valves
valve
air
pilot
air motor
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Granted
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EP88114826A
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German (de)
French (fr)
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EP0311792B1 (en
EP0311792A3 (en
Inventor
Georg Schnetzer
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Wagner International AG
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Wagner International AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area

Definitions

  • the invention relates to a pump device for the simultaneous supply of two atomizing liquids in a selectable ratio to a spray device according to the preamble of claim 1.
  • pump devices are known and available on the market.
  • the cyclical reversal of the two air motors takes place in that one of the two air motors is provided with two pilot valves, the sensors of which are located at the two dead points of the maximum piston stroke and, when the piston is in mechanical contact, pneumatic control signals to the both switch valves of the two air motors. This means that one of the two motors controls the pneumatic switching processes of both air motors.
  • the object of the present invention is therefore to improve the pumping device of the type mentioned at the outset in such a way that the quantitative ratio between the two liquids components can be changed as desired, without affecting the accuracy of the switching processes. This object is achieved by the characterizing features of patent claim 1.
  • both air motors are provided with pilot valves, the control outputs of which are interconnected and guided to the control inputs of the two changeover valves in such a way that the two changeover valves are only controlled by the pair of pilot valves which is assigned to the air motor with a currently larger piston stroke.
  • This enables the balance beam to be adjusted in both directions and thus any quantity ratio of the two liquid components to one another can be selected, for example a transmission ratio of 1: 1 to 1:10 and a reduction ratio of 1: 1 to 0.1: 1 , but the timing for the switchover of the two air motors is retained in its exactness.
  • the pump device has two pneumatic drive motors 10 and 11, each of which consists of a cylinder 10a or 11a, a piston 10b or 11b and a piston rod 10c or 11c.
  • the two piston rods 10c, 11c are connected to one another via a balance beam 12 with displaceable support 13.
  • the piston rods of two paint pumps to be driven by the air motors 10, 11 also extend from the two ends of the balance beam 12, these two pump units not being shown in the drawing.
  • the two air motors 10, 11 are each provided with a pneumatic switch valve 14 and 15, respectively.
  • Each of these changeover valves 14, 15 has a compressed air inlet, two compressed air outlets and two control inlets, the latter being used to switch from one outlet to the other.
  • the two outlets of the valves 14, 15 open into the interior of the associated cylinder 10a and 11a, namely one outlet above, the other outlet below the piston 10b and 11b.
  • each of the air motors 10, 11 is equipped with two pilot valves 16, 17 and 18, 19, respectively.
  • Each pilot valve has a compressed air inlet and a compressed air outlet, the passage through the valve being mechanically controlled, i.e. the path from the inlet to the outlet of the valve is only opened when a sensor is pressed in mechanically against spring force.
  • the sensors of the two pilot valves 16, 17 and 18, 19 protrude from the ceiling or the bottom of the cylinder 10a or 11a into the cylinder interior, such that in one end position of the piston 10b or 11b the one sensor in the other end position the other sensor is mechanically acted upon.
  • the pump device has a main changeover valve 20, the construction of which is similar to that of the changeover valves 14, 15, ie the valve 20 has one compressed air inlet and two compressed air outlets, the changeover of which by two Control inputs is effected.
  • two shuttle valves 21 and 22 are provided, each having two compressed air inlets and a compressed air outlet and operating in the manner of electrical OR gates, ie when compressed air arrives at one inlet, the other inlet is blocked and vice versa.
  • the output lines 16a, 17a, 18a, 19a of the four pilot valves 16, 17, 18, 19 lie crosswise at the inputs of the two shuttle valves 21, 22, such that the output line 16a of the upper pilot valve 16 of the air motor 10 and the output line 19a of the lower pilot valve 19 of the air motor 11 at the inputs of the shuttle valve 21, the output line 17a of the lower pilot valve 17 of the air motor 10 and the output line 18a of the upper pilot valve 18 of the air motor 11 are at the inputs of the shuttle valve 22.
  • the output lines 21a and 22a of the two shuttle valves 21, 22 are located at the two control inputs of the main changeover valve 20.
  • the two outputs of the main changeover valve 20 are connected crosswise to the control inputs of the two changeover valves 14, 15, such that the an output line 20a branches to lines 20a 'and 20a ⁇ , one of which leads to the upper control inlet of the switching valve 14 and the other to the lower control inlet of the switching valve 15, whereas the second outlet 20b of the main switching valve 20 is in two lines 20b' and 20b ⁇ divides, one of which leads to the lower control inlet of the changeover valve 14 and the other to the upper control inlet of the changeover valve 15.
  • the device works as follows.
  • the operation of the air motors 10, 11 takes place in the known usual manner, ie the changeover valves 14, 15 assigned to them alternately allow compressed air to flow into the cylinder space above or below the pistons 10b and 11b via their two compressed air outlets, so that these pistons perform an up-down drive movement, in push-pull mode, because the control inputs of the two changeover valves 14, 15 are cross-connected to one another, as is known.
  • the switching valves 14, 15 are switched over by the pilot valves 16, 17, 18, 19, which give a switching signal to the switching valves 14, 15 when their sensors are touched by the pistons 10b or 11b.
  • pilot valves 16 17, 18, 19 which give a switching signal to the switching valves 14, 15 when their sensors are touched by the pistons 10b or 11b.
  • the main changeover valve 20 is switched from its one outlet 20a to its other outlet 20b and thus controls the two switchover valves 14, 15 via the lines 20b 'and 20b ⁇ that the compressed air now passes over the piston 10b and under the piston 11b into the cylinders 11a and 10a, with the result of a reversal of the piston movement.
  • the support 13 can be shifted to the right or left as desired, and in any case the air motor with the larger piston takes over the switching control automatically, namely the sole switching control.
  • the use of the main changeover valve and the changeover valves also ensure precisely defined pneumatic control signals which ensure the accuracy of the pneumatic control, which is of great importance because the two air motors 14, 15 are mechanically connected to one another via the balance beam 12 .
  • the invention is not limited to the exemplary embodiment shown, but numerous modifications are possible compared to it.
  • the shuttle valves could be omitted, provided that the pilot valves are provided with non-return devices, i.e. the ingress of Compressed air prevented automatically.
  • the outputs of the two changeover valves could also be routed directly to the control inputs of the two changeover valves, with the omission of the main changeover valve, although there is a risk that the pneumatic control signals arriving at the changeover valves are less precisely defined, because in this case the compressed air is already there had to flow through two valves (pilot valve and shuttle valve).

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  • Reciprocating Pumps (AREA)
  • Nozzles (AREA)
  • Spray Control Apparatus (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

A pumping arrangement for the simultaneous feeding of two atomisation liquids in a selectable ratio to a spray apparatus has two pneumatically actuated piston cylinder drive devices (air motors with change-over valve) and two pumps driven by the air motor piston rods, each of which is connected on the intake side to a feedline for one of the two liquid components and on the delivery side to the spray device. The air motor piston rods are connected to one another mechanically by means of an adjustable balance arm and both air motors are provided in each case with two pilot valves which can be mechanically actuated by the motor pistons and which control the change-over valves of the air motors.

Description

Die Erfindung betrifft eine Pumpvorrichtung zum gleichzeitigen Zuführen von zwei Zerstäuberflüssigkeiten in wählbarem Ver­hältnis zu einer Spritzvorrichtung gemäß dem Oberbegriff des Patentanspruches 1. Derartige Pumpvorrichtungen sind bekannt und auf dem Markt erhältlich.The invention relates to a pump device for the simultaneous supply of two atomizing liquids in a selectable ratio to a spray device according to the preamble of claim 1. Such pump devices are known and available on the market.

Bei den bekannten Pumpvorrichtungen dieser Bauart erfolgt die taktmäßige Umsteuerung der beiden Luftmotoren dadurch, daß ei­ner der beiden Luftmotoren mit zwei Pilotventilen versehen ist, deren Fühler sich an den beiden toten Punkten des Kolben-­Maximalhubs befinden und bei mechanischer Berührung durch den Kolben pneumatische Steuersignale auf die beiden Umschaltven­tile der beiden Luftmotoren geben. Dies bedeutet, daß einer der beiden Motoren die pneumatischen Umschaltvorgänge beider Luftmotoren steuert. Auf diese Weise wird zwar eine exakte Umsteuerung der beiden Luftmotoren im Gegentakt erreicht, was schon deshalb wichtig ist, weil ja die beiden Luftmotoren über den Waagebalken mechanisch miteinander gekoppelt sind, jedoch ergibt sich der Nachteil, daß der Waagebalken aus seiner Mittel­lage nur in einer Richtung aus seiner Mittellage verschoben wer­den kann, und zwar in derjenigen, die dazu führt, daß der Hub des steuernden Luftmotors größer ist als des anderen Luft­motors. Nur so ist gewährleistet, daß die Pilotventile des steuernden Luftmotors rechtzeitig ansprechen und Umschalt­signale abgeben. Dies bedeutet aber, daß das Mengenverhältnis der beiden Flüssigkeitskomponenten nur in einem begrenzten Umfang verändert werden kann, nämlich der Mengenanteil derjenigen Flüssigkeitskomponente, die von der vom steuernden Luftmotor angetriebenen Pumpe gefördert wird, stets zumindest 50% betragen muß.In the known pump devices of this type, the cyclical reversal of the two air motors takes place in that one of the two air motors is provided with two pilot valves, the sensors of which are located at the two dead points of the maximum piston stroke and, when the piston is in mechanical contact, pneumatic control signals to the both switch valves of the two air motors. This means that one of the two motors controls the pneumatic switching processes of both air motors. In this way, an exact reversal of the two air motors is achieved in push-pull, which is important because the two air motors are mechanically coupled to each other via the balance beam, but there is the disadvantage that the balance beam only moves in one direction from its central position can be shifted from its central position, in that which leads to the stroke of the controlling air motor being greater than the other air motor. This is the only way to ensure that the pilot valves of the controlling air motor respond in good time and emit switching signals. However, this means that the quantitative ratio of the two liquid components can only be changed to a limited extent, namely the quantitative proportion of that liquid component that is conveyed by the pump driven by the controlling air motor must always be at least 50%.

Aufgabe der vorliegenden Erfindung ist es deshalb, die Pump­vorrichtung der eingangs erwähnten Bauart so zu verbessern, daß das Mengenverhältnis zwischen den beiden Flüssigkeitskom­ ponenten beliebig geändert werden kann, ohne jedoch dabei die Exaktheit der Umschaltvorgänge zu beeinträchtigen. Ge­löst wird diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspruches 1.The object of the present invention is therefore to improve the pumping device of the type mentioned at the outset in such a way that the quantitative ratio between the two liquids components can be changed as desired, without affecting the accuracy of the switching processes. This object is achieved by the characterizing features of patent claim 1.

Gemäß der Erfindung sind also beide Luftmotoren mit Pilotven­tilen versehen, wobei deren Steuerausgänge so zusammengeschal­tet und zu den Steuereingängen der beiden Umschaltventile ge­führt sind, daß die beiden Umschaltventile jeweils nur von dem Pilotventil-Paar angesteuert werden, das dem Luftmotor mit momentan größerem Kolbenhub zugeordnet ist. Auf diese Wei­se wird ermöglicht, daß der Waagebalken nach beiden Richtungen verstellt und somit jedes beliebige Mengenverhältnis der bei­den Flüssigkeitskomponenten zueinander gewählt werden kann, beispielsweise ein Übersetzungsverhältnis von 1:1 bis 1:10 und ein Untersetzungsverhältnis von 1:1 bos 0,1:1, trotzdem aber die Taktgabe für die Umschaltung der beiden Luftmotoren in ihrer Exaktheit erhalten bleibt.According to the invention, therefore, both air motors are provided with pilot valves, the control outputs of which are interconnected and guided to the control inputs of the two changeover valves in such a way that the two changeover valves are only controlled by the pair of pilot valves which is assigned to the air motor with a currently larger piston stroke. This enables the balance beam to be adjusted in both directions and thus any quantity ratio of the two liquid components to one another can be selected, for example a transmission ratio of 1: 1 to 1:10 and a reduction ratio of 1: 1 to 0.1: 1 , but the timing for the switchover of the two air motors is retained in its exactness.

Weitere Ausgestaltungen der Erfindung sind in den Unteransprü­chen gekennzeichnet. Mit der im Patentanspruch 2 gekennzeich­neten Weiterbildung wird eine Verbesserung der Definition (Be­trag und Dauer) der pneumatischen Umschaltsignale erzielt, weil hier die beiden Umsteuerventile unmittelbar von einem zu­sätzlichen Haupt-Umsteuerventil angesteuert werden.Further refinements of the invention are characterized in the subclaims. With the further development characterized in claim 2, an improvement in the definition (amount and duration) of the pneumatic changeover signals is achieved because here the two changeover valves are controlled directly by an additional main changeover valve.

Die Erfindung wird nachstehend anhand der Zeichnung näher er­läutert, wobei die einzige Figure eine Schemaskizze des rele­vanten Teils der Pumpenvorrichtung darstellt.The invention is explained in more detail below with reference to the drawing, the single figure representing a schematic sketch of the relevant part of the pump device.

Die Pumpvorrichtung weist zwei pneumatische Antriebsmotoren 10 und 11 auf, deren jeder aus einem Zylinder 10a bzw. 11a, einem Kolben 10b bzw. 11b und einer Kolbenstange 10c bzw. 11c besteht. Die beiden Kolbenstangen 10c, 11c sind über einen Waagebalken 12 mit verschiebbarer Abstützung 13 miteinander verbunden. Von den beiden Enden des Waagebalkens 12 gehen aus­serdem die Kolbenstangen von zwei durch die Luftmotoren 10,11 anzutreibenden Farbpumpen ab, wobei diese beiden Pumpenaggre­gate auf der Zeichnung nicht dargestellt sind.The pump device has two pneumatic drive motors 10 and 11, each of which consists of a cylinder 10a or 11a, a piston 10b or 11b and a piston rod 10c or 11c. The two piston rods 10c, 11c are connected to one another via a balance beam 12 with displaceable support 13. The piston rods of two paint pumps to be driven by the air motors 10, 11 also extend from the two ends of the balance beam 12, these two pump units not being shown in the drawing.

Die beiden Luftmotoren 10, 11 sind jeweils mit einem pneumati­schen Umschaltventil 14 bzw. 15 versehen. Jedes dieser Umschalt­ventile 14, 15 besitzt einen Drucklufteinlaß, zwei Druckluft­auslässe und zwei Steuereinlässe, wobei über letztere das Um­schalten von dem einen auf den anderen Auslaß bewirkt wird. Die beiden Auslässe der Ventile 14, 15 münden in den Innenraum des zugeordneten Zylinders 10a bzw. 11a, und zwar der eine Aus­laß über, der andere Auslaß unter dem Kolben 10b bzw. 11b. Fer­ner ist jeder der Luftmotoren 10, 11 mit zwei Pilotventilen 16, 17 bzw. 18, 19 ausgerüstet. Jedes Pilotventil hat einen Druck­lufteinlaß und einen Druckluftauslaß, wobei der Durchgang durch das Ventil mechanisch gesteuert wird, d.h. nur bei mechanischem Eindrücken eines Fühlers gegen Federkraft wird der Weg vom Ein­laß zum Auslaß des Ventils geöffnet. Die Fühler der beiden Pilotventile 16, 17 bzw. 18, 19 ragen von der Decke bzw. vom Boden des Zylinders 10a bzw. 11a in den Zylinderinnenraum, derart, daß in der einen Endstellung des Kolbens 10b bzw. 11b der eine Fühler, in der anderen Endstellung der andere Fühler mechanisch beaufschlagt wird.The two air motors 10, 11 are each provided with a pneumatic switch valve 14 and 15, respectively. Each of these changeover valves 14, 15 has a compressed air inlet, two compressed air outlets and two control inlets, the latter being used to switch from one outlet to the other. The two outlets of the valves 14, 15 open into the interior of the associated cylinder 10a and 11a, namely one outlet above, the other outlet below the piston 10b and 11b. Furthermore, each of the air motors 10, 11 is equipped with two pilot valves 16, 17 and 18, 19, respectively. Each pilot valve has a compressed air inlet and a compressed air outlet, the passage through the valve being mechanically controlled, i.e. the path from the inlet to the outlet of the valve is only opened when a sensor is pressed in mechanically against spring force. The sensors of the two pilot valves 16, 17 and 18, 19 protrude from the ceiling or the bottom of the cylinder 10a or 11a into the cylinder interior, such that in one end position of the piston 10b or 11b the one sensor in the other end position the other sensor is mechanically acted upon.

Weiterhin weist die Pumpvorrichtung ein Haupt-Umschaltventil 20 auf, dessen Aufbau demjenigen der Umschaltventile 14, 15 ähnlich ist, d.h., das Ventil 20 hat einen Drucklufteinlaß und zwei Druckluftauslässe, deren Umschaltung durch zwei Steuereingänge bewirkt wird. Schließlich sind zwei Wechsel­ventile 21 und 22 vorgesehen, die jeweils zwei Druckluftein­lässe und einen Druckluftauslaß aufweisen und in Art elektri­scher Oder - Gatter arbeiten, d.h., bei Ankunft von Druckluft an dem einen Einlaß wird der andere Einlaß gesperrt und um­gekehrt.Furthermore, the pump device has a main changeover valve 20, the construction of which is similar to that of the changeover valves 14, 15, ie the valve 20 has one compressed air inlet and two compressed air outlets, the changeover of which by two Control inputs is effected. Finally, two shuttle valves 21 and 22 are provided, each having two compressed air inlets and a compressed air outlet and operating in the manner of electrical OR gates, ie when compressed air arrives at one inlet, the other inlet is blocked and vice versa.

Mit 30 ist eine Druckluftquelle bezeichnet, die über ein Druck­regelventil 31 und eine Druckluft-Hauptleitung 32 Druckluft den Eingängen der Umschaltventile 14, 15, 20 und den Pilot­ventilen 16, 17, 18, 19 zuführt. Die Ausgangsleitungen 16a, 17a, 18a, 19a der vier Pilotventile 16, 17, 18, 19 liegen über Kreuz an den Eingängen der beiden Wechselventile 21, 22, derart, daß die Ausgangsleitung 16a des oberen Pilotventils 16 des Luftmotors 10 und die Ausgangsleitung 19a des unteren Pi­lotventils 19 des Luftmotors 11 an den Eingängen des Wechsel­ventils 21, die Ausgangsleitung 17a des unteren Pilotventils 17 des Luftmotors 10 und die Ausgangsleitung 18a des oberen Pilotventils 18 des Luftmotors 11 an den Eingängen des Wechsel­ventils 22 liegen. Die Ausgangsleitungen 21a bzw. 22a der bei­den Wechselventile 21, 22 liegen an den beiden Steuereingängen des Haupt-Umsteuerventils 20. Schließlich sind die beiden Aus­gänge des Haupt-Umschaltventils 20 über Kreuz mit den Steuer­eingängen der beiden Umschaltventile 14, 15 verbunden, derart, daß die eine Ausgangsleitung 20a sich zu Leitungen 20a′ und 20a˝ verzweigt, deren eine am oberen Steuereinlaß des Umschalt­ventils 14 und deren andere zum unteren Steuereinlaß des Um­schaltventils 15 führt, wohingegen sich der zweite Auslaß 20b des Haupt-Umschaltventils 20 sich in zwei Leitungen 20b′ und 20b˝ aufteilt, deren eine zum unteren Steuereinlaß des Um­schaltventils 14 und deren andere zum oberen Steuereinlaß des Umschaltventils 15 führt.30 designates a compressed air source which supplies compressed air to the inputs of the changeover valves 14, 15, 20 and the pilot valves 16, 17, 18, 19 via a pressure control valve 31 and a compressed air main line 32. The output lines 16a, 17a, 18a, 19a of the four pilot valves 16, 17, 18, 19 lie crosswise at the inputs of the two shuttle valves 21, 22, such that the output line 16a of the upper pilot valve 16 of the air motor 10 and the output line 19a of the lower pilot valve 19 of the air motor 11 at the inputs of the shuttle valve 21, the output line 17a of the lower pilot valve 17 of the air motor 10 and the output line 18a of the upper pilot valve 18 of the air motor 11 are at the inputs of the shuttle valve 22. The output lines 21a and 22a of the two shuttle valves 21, 22 are located at the two control inputs of the main changeover valve 20. Finally, the two outputs of the main changeover valve 20 are connected crosswise to the control inputs of the two changeover valves 14, 15, such that the an output line 20a branches to lines 20a 'and 20a˝, one of which leads to the upper control inlet of the switching valve 14 and the other to the lower control inlet of the switching valve 15, whereas the second outlet 20b of the main switching valve 20 is in two lines 20b' and 20b˝ divides, one of which leads to the lower control inlet of the changeover valve 14 and the other to the upper control inlet of the changeover valve 15.

Die Vorrichtung arbeitet folgendermaßen. Der Betrieb der Luft­motoren 10, 11 erfolgt in der bekannten üblichen Weise, d.h., die ihnen zugeordneten Umschaltventile 14, 15 lassen über ihre beiden Druckluftauslässe abwechselnd Druckluft in den Zylinderraum über bzw. unter den Kolben 10b bzw. 11b strömen, so daß diese Kolben eine Auf-Ab-Antriebsbewegung durchführen, und zwar im Gegentakt, weil ja die Steuereingänge der beiden Umschaltventile 14, 15 -wie bekannt- über Kreuz miteinander in Verbindung stehen. Die Umschaltung der Umschaltventile 14, 15 erfolgt durch die Pilotventile 16, 17, 18, 19, die bei Be­rührung ihres Fühlers durch den Kolben 10b bzw. 11b ein Um­schaltsignal auf die Umschaltventile 14, 15 geben. Auch dies ist eine bekannte und übliche Technik, jedoch nur für den Fall, daß einer der beiden Luftmotoren mit Pilotventilen versehen ist. Erfindungsgemäß sind nun aber beide Luftmotoren mit Pilotven­teilen versehen und die Steuerung der Umschaltventile 14, 15 erfolgt bei der dargestellten Vorrichtung nicht direkt von den Pilotventilen, sondern in der nachfolgend beschriebenen Weise über das Haupt-Umschaltventil 20.The device works as follows. The operation of the air motors 10, 11 takes place in the known usual manner, ie the changeover valves 14, 15 assigned to them alternately allow compressed air to flow into the cylinder space above or below the pistons 10b and 11b via their two compressed air outlets, so that these pistons perform an up-down drive movement, in push-pull mode, because the control inputs of the two changeover valves 14, 15 are cross-connected to one another, as is known. The switching valves 14, 15 are switched over by the pilot valves 16, 17, 18, 19, which give a switching signal to the switching valves 14, 15 when their sensors are touched by the pistons 10b or 11b. This is also a known and customary technique, but only in the event that one of the two air motors is provided with pilot valves. According to the invention, however, both air motors are now provided with pilot valves and the switching valves 14, 15 are not controlled directly from the pilot valves in the device shown, but rather in the manner described below via the main switching valve 20.

Es wird zunächst angenommen, daß die Unterstützung 13 des Waagebalkens nach links verschoben ist, der Waagebalkenab­schnitt 12a also kürzer ist als der Waagebalkenabschnitt 12b, mit der zwangsläufigen Folge, daß der Hub des Kolbens 10b kleiner ist als der Hub des Kolbens 11b. Damit aber erreicht bei einer Aufwärtsbewegung des Kolbens 11b dieser den Fühler seines oberen Pilotventils 18 zu einem Zeitpunkt, an dem der sich nach unten bewegende Kolben 10a noch um eine bestimmte Strecke vom Fühler seines unteren Pilotventils 17 entfernt ist. Durch die Berührung des Fühlers des Pilotventils 18 durch den Kolben 11b wird dieser eingedrückt und das Ventil freigeschal­tet, das heißt, Druckluft strömt durch die Auslaßleitung 18a zu dem einen Einlaß des Wechselventils 22, sperrt dabei den anderen Einlaß des Wechselventils 22 und strömt über die Aus­laßleitung 22a des Wechselventils 22 zum unteren Steuereinlaß des Haupt-Umschaltventils 20. Damit wird das Haupt-Umschalt­ventil 20 von seinem einen Auslaß 20a auf seinen anderen Aus­laß 20b umgeschaltet und steuert somit über die Leitungen 20b′ und 20b˝ die beiden Umschaltventile 14, 15 derart um, daß die Druckluft nunmehr über dem Kolben 10b und unter dem Kolben 11b in die Zylinder 11a bzw. 10a gelangt, mit der Folge einer Umkehr der Kolbenbewegung. Der Kolben 11b erreicht dann wie­derum bei seiner Bewegung nach unten den Fühler seines unteren Pilotventils 19, bevor der Kolben 10b den Fühler seines oberen Pilotventils 16 erreichen könnte mit der Folge, daß dieselbe Umschaltfunktion nun vom Pilotventil 19 über das Haupt-Umschaltventil 20 ausgelöst wird. Es ist ersichtlich, daß bei diesem Betrieb, also Verschiebung der Abstützung 13 des Waagebalkens 12 nach links, die Umschaltung ausschließlich von den beiden Pilotventilen 18, 19 initiiert wird, wohin­gegen die Pilotventile 16, 17 durch die Wechselventile 21, 22 vom Steuerkreislauf abgeschaltet sind. Wird dagegen nunmehr die Abstützung 13 des Waagebalkens 12 nach rechts verschoben, womit der Balkenabschnitt 12a größer als der Balkenabschnitt 12b wird, dann erreicht zwangsläufig der Kolben 10b den Fühler des oberen bzw. unteren Pilotventils 16, 17 zu einem Zeitpunkt, wenn der Kolben 11b noch um eine vorgegebene Strecke vom Fühler des Pilotventils 18 bzw. 19 entfernt ist. Damit aber gelangt an die Wechselventile 21, 22 zuerst die Druckluft der Pilotventile 16, 17, so daß also jetzt die Leitungen 18a und 19a abgeschal­tet werden und die Steuerung des Haupt-Umschaltventils 20 und der daran angeschlossenen Umschaltventile 14, 15 ausschließlich von den Pilotventilen 16, 17 erfolgt.It is initially assumed that the support 13 of the balance beam is shifted to the left, i.e. the balance beam section 12a is shorter than the balance beam section 12b, with the inevitable consequence that the stroke of the piston 10b is less than the stroke of the piston 11b. When the piston 11b moves upward, however, this reaches the sensor of its upper pilot valve 18 at a point in time at which the piston 10a moving downward is still a certain distance away from the sensor of its lower pilot valve 17. By touching the sensor of the pilot valve 18 by the piston 11b, the latter is pressed in and the valve is released, that is to say that compressed air flows through the outlet line 18a to the one inlet of the shuttle valve 22, closes the other inlet of the shuttle valve 22 and flows via the outlet line 22a of the shuttle valve 22 to the lower control inlet of the main changeover valve 20. Thus, the main changeover valve 20 is switched from its one outlet 20a to its other outlet 20b and thus controls the two switchover valves 14, 15 via the lines 20b 'and 20b˝ that the compressed air now passes over the piston 10b and under the piston 11b into the cylinders 11a and 10a, with the result of a reversal of the piston movement. The piston 11b then again reaches the sensor of its lower one as it moves downward Pilot valve 19 before the piston 10b could reach the sensor of its upper pilot valve 16, with the result that the same switching function is now triggered by the pilot valve 19 via the main switching valve 20. It can be seen that in this operation, i.e. shifting the support 13 of the balance beam 12 to the left, the changeover is initiated exclusively by the two pilot valves 18, 19, whereas the pilot valves 16, 17 are switched off by the control valves from the control circuit. If, however, the support 13 of the balance beam 12 is now shifted to the right, whereby the beam section 12a becomes larger than the beam section 12b, then the piston 10b inevitably reaches the sensor of the upper or lower pilot valve 16, 17 at a time when the piston 11b is still is a predetermined distance from the sensor of the pilot valve 18 or 19. With this, however, the compressed air of the pilot valves 16, 17 first reaches the shuttle valves 21, 22, so that the lines 18a and 19a are now switched off and the control of the main switch valve 20 and the switch valves 14, 15 connected thereto is controlled exclusively by the pilot valves 16 , 17 takes place.

Aus obigem ergibt sich, daß die Abstützung 13 beliebig nach rechts oder links verschoben werden kann, wobei in jedem Fall der Luftmotor mit dem jeweils größeren Kolben die Umschalt­steuerung selbsttätig übernimmt, und zwar die alleinige Um­schaltsteuerung. Durch den Einsatz des Haupt-Umschaltventils und der Wechselventile werden außerdem exakt definierte pneu­matische Steuersignale gewährleistet, welche die Exaktheit der pneumatischen Steuerung sicherstellen, was schon deshalb von großer Bedeutung ist, weil ja die beiden Luftmotoren 14, 15 über den Waagebalken 12 miteinander mechanisch verbunden sind.It follows from the above that the support 13 can be shifted to the right or left as desired, and in any case the air motor with the larger piston takes over the switching control automatically, namely the sole switching control. The use of the main changeover valve and the changeover valves also ensure precisely defined pneumatic control signals which ensure the accuracy of the pneumatic control, which is of great importance because the two air motors 14, 15 are mechanically connected to one another via the balance beam 12 .

Selbstverständlich ist die Erfindung nicht auf das darge­stellte Ausführungsbeispiel beschränkt, sondern es sind die­sem gegenüber zahlreiche Abwandlungen möglich. So könnten bei­spielsweise die Wechselventile unter der Voraussetzung wegge­lassen werden, daß die Pilotventile mit Rückschlageinrichtun­gen versehen sind, also ausgangsseitig das Eindringen von Druckluft selbsttätig verhindert. Auch könnten die Ausgänge der beiden Wechselventile unter Wegfall des Haupt-Umschalt­ventils direkt an die Steuereingänge der beiden Umschaltven­tile geführt sein, wobei jedoch die Gefahr besteht, daß die an den Umschaltventilen ankommenden pneumatischen Steuersig­nale weniger exakt definiert sind, weil in diesem Fall ja die Druckluft bereits zwei Ventile (Pilotventil und Wechselventil) durchströmen mußte.Of course, the invention is not limited to the exemplary embodiment shown, but numerous modifications are possible compared to it. For example, the shuttle valves could be omitted, provided that the pilot valves are provided with non-return devices, i.e. the ingress of Compressed air prevented automatically. The outputs of the two changeover valves could also be routed directly to the control inputs of the two changeover valves, with the omission of the main changeover valve, although there is a risk that the pneumatic control signals arriving at the changeover valves are less precisely defined, because in this case the compressed air is already there had to flow through two valves (pilot valve and shuttle valve).

Claims (4)

1. Pumpvorrichtung zum gleichzeitigen Zuführen von zwei Zer­stäuberflüssigkeiten in wählbarem Verhältnis zu einer Spritz­vorrichtung, bestehend aus zwei pneumatisch betätigten Kolben-­Zylinder-Antriebsvorrichtungen (Luftmotoren) mit Umsteuerventil und aus zwei von den Luftmotor-Kolbenstangen angetriebenen Pumpen, deren jede saugseitig mit einer Zufuhr für eine der beiden Flüssigkeitskomponenten und druckseitig mit der Spritz­vorrichtung verbunden ist, wobei die Luftmotor-Kolbenstangen durch einen verstellbaren Waagebalken mechanisch miteinander verbunden sind und einer der beiden Luftmotoren mit zwei vom Motorkolben mechanisch betätigbaren Pilotventilen zum pneumati­schen Ansteuern der Umsteuerventile versehen ist, dadurch ge­kennzeichnet, daß beide Luftmotoren (10,11) mit jeweils einem Pilotventil-Paar (16,17;18,19) versehen sind und daß für jedes gewählte Über- bzw. Untersetzungsverhältnis jeweils das Pilot­ventil-Paar (16,17;18,19) desjenigen Luftmotors (10,11) die Ansteuerung der Umsteuerventile (14,15) beider Luftmotore (10,11) übernimmt, dessen Kolben bei seinem Hub die Pilotven­tile (16,17;18,19) zuerst betätigt.1.Pumping device for the simultaneous supply of two atomizing liquids in a selectable ratio to a spraying device, consisting of two pneumatically actuated piston-cylinder drive devices (air motors) with reversing valve and two pumps driven by the air motor piston rods, each of which on the suction side with a supply for one of the two liquid components and is connected on the pressure side to the spraying device, the air motor piston rods being mechanically connected to one another by an adjustable balance beam and one of the two air motors being provided with two pilot valves mechanically actuated by the engine piston for pneumatically actuating the reversing valves, characterized in that both air motors (10, 11) are each provided with a pair of pilot valves (16, 17; 18, 19) and that for each selected step-up or reduction ratio, the pair of pilot valves (16, 17; 18, 19) of that air motor (10 , 11) the control of the U Control valves (14, 15) of both air motors (10, 11) takes over, the piston of which actuates the pilot valves (16, 17; 18, 19) first during its stroke. 2. Pumpvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jeweils die Ausgangsleitung (16a,17a) der Pilotventile (16,17) des einen Luftmotors (10) mit der Ausgangsleitung (18a, 19a) eines Pilotventils (18,19) des anderen Luftmotors (11) über Kreuz (16a,19a; 17a,18a) verbunden ist und jede der beiden Verbindungsleitungen über Kreuz an einen der beiden Steuerein­gänge des einen und des anderen Umschaltventils (14,15) ange­schlossen ist.2. Pump device according to claim 1, characterized in that in each case the output line (16a, 17a) of the pilot valves (16, 17) of the one air motor (10) with the output line (18a, 19a) of a pilot valve (18, 19) of the other air motor (11) is connected crosswise (16a, 19a; 17a, 18a) and each of the two connecting lines is connected crosswise to one of the two control inputs of the one and the other changeover valve (14, 15). 3. Pumpvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die beiden Verbindungsleitungen (21a,22a) der vier Pilot­ventil-Ausgangsleitungen (16a,17a,18a,19a) an die beiden Steu­ereingänge eines Haupt-Umschaltventils (20) angeschlossen ist, dessen beide Ausgangsleitungen (20a,20b) über Kreuz jeweils mit einem Steuereingang des Umschaltventils (14) des einen Luft­motors (10) und einem Steuereingang des Umschaltventils (15) des anderen Luftmotors (11) verbunden sind.3. Pump device according to claim 2, characterized in that the two connecting lines (21a, 22a) of the four pilot valve output lines (16a, 17a, 18a, 19a) are connected to the two control inputs of a main changeover valve (20), whose two output lines (20a, 20b) are each cross-connected to a control input of the changeover valve (14) of one air motor (10) and a control input of the changeover valve (15) of the other air motor (11). 4. Pumpvorrichtung nach Anspruch 2 oder 3, dadurch gekennzeich­net, daß die beiden Ausgangsleitungspaare (16a,18a,18a,19a) der vier Pilotventile (16,17,18,19) an die beiden Eingänge von zwei Wechselventilen (21,22) geführt sind, wobei dann die Aus­gangsleitungen (21a,22a) der beiden Wechselventile (21,22) die zu den Steuereingängen des Haupt-Umschaltventils (20) füh­renden Verbindungsleitungen darstellen.4. Pump device according to claim 2 or 3, characterized in that the two pairs of output lines (16a, 18a, 18a, 19a) of the four pilot valves (16,17,18,19) to the two inputs of two shuttle valves (21,22) the output lines (21a, 22a) of the two shuttle valves (21, 22) then represent the connecting lines leading to the control inputs of the main changeover valve (20).
EP88114826A 1987-10-15 1988-09-09 Pumping arrangement for the simultaneous feeding of two liquids to a spray apparatus Expired - Lifetime EP0311792B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873734980 DE3734980A1 (en) 1987-10-15 1987-10-15 PUMP DEVICE FOR DELIVERING TWO SPRAYING LIQUIDS TO A SPRAYING DEVICE AT THE SAME TIME
DE3734980 1987-10-15

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EP0311792A2 true EP0311792A2 (en) 1989-04-19
EP0311792A3 EP0311792A3 (en) 1990-04-25
EP0311792B1 EP0311792B1 (en) 1992-11-11

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EP88114826A Expired - Lifetime EP0311792B1 (en) 1987-10-15 1988-09-09 Pumping arrangement for the simultaneous feeding of two liquids to a spray apparatus

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EP (1) EP0311792B1 (en)
JP (1) JP2563992B2 (en)
DE (1) DE3734980A1 (en)

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US10197047B2 (en) * 2014-06-11 2019-02-05 Graco Minnesota, Inc. Hydraulic proportioning system with flow divider
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DE1230264B (en) * 1959-09-26 1966-12-08 Elisabeth Zoeller Geb Kehl Control for a pressure medium motor with double-sided controlled acted upon working piston
FR2396184A1 (en) * 1977-06-29 1979-01-26 Allibe Ateliers & Co Liq. vol. dosing machine - has variable vol. secondary pumps driven from balance arm by slider movable in stirrup slots
CH641529A5 (en) * 1978-12-18 1984-02-29 Hedrich Vakuumanlagen Wilhelm DEVICE FOR CONVEYING AND DOSING MEASURED QUANTITIES OF MATERIAL, IN PARTICULAR OF MOLDING RESIN COMPONENTS.
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EP0163588A1 (en) * 1984-04-17 1985-12-04 Antoine Kiefer Spraying apparatus for mixtures of liquids

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EP0403829A2 (en) * 1989-06-20 1990-12-27 ING. ENEA MATTEI S.p.A. Rotary compressor with oleopneumatic delivery control device
EP0403829A3 (en) * 1989-06-20 1991-10-23 ING. ENEA MATTEI S.p.A. Rotary compressor with oleopneumatic delivery control device

Also Published As

Publication number Publication date
EP0311792B1 (en) 1992-11-11
EP0311792A3 (en) 1990-04-25
DE3734980C2 (en) 1989-07-27
US4917580A (en) 1990-04-17
JPH01130748A (en) 1989-05-23
JP2563992B2 (en) 1996-12-18
DE3734980A1 (en) 1989-04-27

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