EP1245291A2 - Valve unit for an electrostatic coating installation - Google Patents

Valve unit for an electrostatic coating installation Download PDF

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Publication number
EP1245291A2
EP1245291A2 EP02006090A EP02006090A EP1245291A2 EP 1245291 A2 EP1245291 A2 EP 1245291A2 EP 02006090 A EP02006090 A EP 02006090A EP 02006090 A EP02006090 A EP 02006090A EP 1245291 A2 EP1245291 A2 EP 1245291A2
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EP
European Patent Office
Prior art keywords
valve
unit according
valve unit
signal
sensor
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.)
Granted
Application number
EP02006090A
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German (de)
French (fr)
Other versions
EP1245291A3 (en
EP1245291B1 (en
Inventor
Hans-Jürgen Dr. Nolte
Harry Krumma
Frank Herre
Michael Baumann
Stefano Giuliano
Siegfried Poppe
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Duerr Systems AG
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Duerr Systems AG
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Publication date
Priority claimed from DE10115472A external-priority patent/DE10115472A1/en
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
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Publication of EP1245291A3 publication Critical patent/EP1245291A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/306—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a fluid
    • 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
    • B05B12/004—Arrangements for controlling delivery; Arrangements for controlling the spray area comprising sensors for monitoring the delivery, e.g. by displaying the sensed value or generating an alarm
    • 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
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • 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
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces

Definitions

  • the invention is accordingly based on the object of a valve unit specify the switch position even under high voltage can be queried with as little delay as possible.
  • a ram or shaft member 10 On its back facing away from the valve needle 1 is on the Piston 6 a ram or shaft member 10 attached, the same axis with the valve needle 1, for example, within the Compression spring 8 can be arranged.
  • the end part 11 facing away from the piston 6 has the shaft member 10 as shown, an optically reflective surface element 12.
  • the reflective surface of the element 12 can be flat be and around the entire circumference of the cross section, for example extend square end portion of the shaft.
  • the end part 11 provided with the reflective element 12 is in the drawing in the two switching positions of the main needle valve shown. At 11, 12 they are in the (left) The closed position can be seen at 11 ', 12' in its (right) valve opening position.
  • the needle stroke H between these two Switch positions can be about 5 mm, for example.
  • the shaft 10 is in a recess coaxial to the needle axis 14 of the valve housing, in which a radial, that is, an opening running transversely to the needle axis through the housing 15 leads.
  • a holding and positioning body is seated in the opening 15 17 for two optical fiber units 20 and 21, whose optical end faces with the inner wall of the recess 14 are aligned in the two places where the reflective element 12, 12 'in the two switching positions located.
  • the reflective element is therefore closed Main needle valve closely adjacent to the face of the Optical fiber unit 20 and with the valve open End face of the unit 21 opposite. The mutual distance the central axes of the units 20, 21 correspond to the valve needle stroke H.
  • the shaft element 10 By approximating the the shaft element 10 displacing sensor element can change the polarization direction of that passed through the polarizer Light in the sensor element for generating a light signal be rotated.
  • One to the polarizer connected optical fiber arrangement leads to a remote, located outside the high voltage range electronic device for generating a light signal corresponding electrical signal.
  • the sensor element can contain a reflector that from the polarizer returns incoming light to the analyzer, where between the polarizer and the reflector a refractive element (Faraday effect element) or a prism is located and an optical fiber to the polarization device for the light supplied to the sensor element and to the analyzer an optical fiber for that of the remote electronic device supplied light are connected.
  • Such optical Sensors are known per se and are commercially available.
  • a or two sensors e.g. at the locations of the optical fibers 20 and / or 21 may be arranged in Fig. 1.
  • the one from the sensor in the two switch positions triggered binary signals expediently have the same binary value.
  • the binary signals are from the electronic sensor device generated at a distance from the valve Location outside the high voltage range and with connected to the valve unit via the optical fiber arrangement is. If the shaft member 10 between its two positions is shifted, the sensor signal changes due to the lying between the two signal generating elements Range first in the opposite binary value before the first binary value again when the other valve position is reached is produced.
  • an electronic control device can be determined whether, for example, after Generating a control signal for switching the valve (and after the disappearance of the first binary value) within a prescribed time again the first binary value as a message the other valve position is generated. Isn't that Case, there is a fault, which is reported by an alarm signal becomes.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A main needle valve for an electrostatic sprayer has an optoelectronic sensor device with light wave conductors (20,21) with their front surfaces facing a reflex element (12) for a structural link (10) moved by the valve needle (1), which is remotely controlled to slide between two indexing positions. The optoelectronic sensor senses an indexing position and generates a corresponding sensing signal.

Description

Die Erfindung betrifft eine Ventileinheit gemäß dem Oberbegriff des Anspruchs 1 insbesondere für einen im Betrieb unter Hochspannung stehenden Zerstäuber für die Serienbeschichtung beispielsweise von Fahrzeugkarossen.The invention relates to a valve unit according to the preamble of claim 1 in particular for one in operation high voltage atomizers for series coating for example of vehicle bodies.

In bekannten elektrostatischen Rotations- oder Luftzerstäubern dieser Art (DE 4306800 A bzw. Dürr/Behr "EcoGun ESTA") wird die Farbleitung am Eintritt in das Zerstäubungsorgan mit einem Farbnadelventil geöffnet und geschlossen, dem sogenannten Hauptnadelventil, dessen Ventilnadel von dem Kolben eines pneumatischen Ventilantriebs unter Steuerung durch das übergeordnete Programmsteuersystem der Beschichtungsanlage aus der Schließstellung gegen die Kraft einer Rückstellfeder in die Öffnungsstellung gezogen wird.In known electrostatic rotary or air atomizers this type (DE 4306800 A or Dürr / Behr "EcoGun ESTA") the paint line at the entrance to the atomizer with one Paint needle valve opened and closed, the so-called Main needle valve, the valve needle of the piston one pneumatic valve drive under the control of the parent Program control system of the coating system from the Closed position against the force of a return spring in the Open position is pulled.

Für die übergeordnete Anlagensteuerung ist eine Rückmeldung mindestens einer und vorzugsweise beider Schaltstellungen des Haupt- oder Farbnadelventils erwünscht. Beispielsweise bei nicht elektrostatischen Luftzerstäubern war es möglich und üblich, die gewünschten Schaltstellungssignale mit am Ventilantrieb angebrachten Hallsensoren oder induktiven Sensoren zu erzeugen. Diese elektrischen Sensoren können aber nicht in elektrostatischen Zerstäubern verwendet werden, die während des Betriebes unter Hochspannung stehen. Obwohl auch hier eine Schaltstellungsabfrage wichtig wäre, gab es dafür bisher keine realisierbare Möglichkeit.There is feedback for the higher-level system control at least one and preferably both switch positions of the Main or color needle valve desired. For example at it was possible and common for non-electrostatic air atomizers the desired switching position signals on the valve actuator attached Hall sensors or inductive sensors produce. However, these electrical sensors cannot be used in electrostatic Atomizers used during the Operation under high voltage. Although here too Switch position request would have been important, there has not been any feasible possibility.

Die Erfassung der Schaltstellung einer Ventilnadel zur Steuerung des Farbflusses erfolgt einerseits zur Überwachung der Schaltfunktion durch Rückmeldung und andererseits auch zur Ventilsteuerung. Durch die Erfassung der Zeit zwischen dem Ansteuersignal einer Ventilnadel und der Rückmeldung der Schaltstellungsänderung und dem Vergleich mit einem vorgegebenen Sollwert können betriebsbedingte Abweichungen (z.B. durch Bauteilverschleiß) erkannt und steuerungstechnisch kompensiert werden. Dadurch ist besonders bei Lackierrobotern, die mit hohen Lackiergeschwindigkeiten und häufigem Ein-/Ausschalten von Ventilnadeln arbeiten, eine bessere Konstanz der Prozeßabläufe möglich.The detection of the switching position of a valve needle for control the color flow takes place on the one hand to monitor the Switching function by feedback and on the other hand also for Valve control. By detecting the time between the control signal a valve needle and the feedback of the switch position change and comparing it with a given one Setpoint can cause operational deviations (e.g. due to component wear) recognized and compensated by control technology become. This makes it particularly suitable for painting robots with high Painting speeds and frequent switching on / off of Valve needles work, better consistency of the processes possible.

Es gibt zwar auch pneumatische Sensoren zur Abfrage der Schaltstellung von Ventilen, die aber für die hier betrachteten dynamischen Prozesse zu langsam sind.There are also pneumatic sensors for querying the Switch position of valves, but for those considered here dynamic processes are too slow.

Der Erfindung liegt demgemäß die Aufgabe zugrunde, eine Ventileinheit anzugeben, deren Schaltstellung auch unter Hochspannung möglichst verzögerungsfrei abfragbar ist.The invention is accordingly based on the object of a valve unit specify the switch position even under high voltage can be queried with as little delay as possible.

Diese Aufgabe wird durch die Merkmale der Patentansprüche gelöst.This object is solved by the features of the claims.

Durch die Erfindung wird eine potentialfreie und deshalb auch für elektrostatische Zerstäuber geeignete Schaltstellungssignalisierung beispielsweise zur Hauptnadelabfrage ermöglicht. Auch die Schaltstellung anderer in einem elektrostatischen Zerstäuber oder in sonstigen unter Hochspannung stehenden Bestandteilen einer Beschichtungsanlage befindlicher Ventile kann in der hier beschriebenen Weise abgefragt werden. Bei dem Ventil kann es sich beispielsweise auch um ein Membranventil handeln.The invention makes a potential-free and therefore also Switch position signaling suitable for electrostatic atomizers for example for the main needle query. The switching position of others in an electrostatic Atomizers or other high voltage devices Components of a coating system of existing valves can be queried in the manner described here. The valve can also be a diaphragm valve, for example act.

An dem in der Zeichnung als Ausführungsbeispiel dargestellten elektrostatischen Rotationszerstäuber für Direktaufladung des Beschichtungsmaterials wird die Erfindung näher erläutert. Es zeigen

Fig. 1
den Rotationszerstäuber mit der Ventileinheit; und
Fig. 2 und Fig. 3
zwei abgewandelte Ausführungsformen.
The invention is explained in more detail using the electrostatic rotary atomizer for direct charging of the coating material, which is shown as an exemplary embodiment in the drawing. Show it
Fig. 1
the rotary atomizer with the valve unit; and
2 and 3
two modified embodiments.

Der in Fig. 1 dargestellte Zerstäuber hat das übliche Hauptnadelventil mit der Ventilnadel 1 zum Öffnen und Schließen des in der Zerstäuberglocke 4 mündenden Farbkanals 2. Die Ventilnadel ist längs ihrer Achse in dem den Farbkanal 2 enthaltenden koaxialen Farbrohr 3 verschiebbar. Für die Ventilbetätigung ist ein pneumatischer Ventilantrieb mit einem Kolben 6 vorgesehen, der zum Öffnen des Hauptnadelventils bei 7 mit Druckluft beaufschlagt wird und infolgedessen die an ihm befestigte Ventilnadel 1 gegen die Kraft einer auf seiner Rückseite angreifenden Druckfeder 8 in der Zeichnung nach rechts in die von der Zerstäuberglocke 4 abgewandte Richtung zieht. Insoweit ist der Zerstäuber an sich bekannt. Im Betrieb kann das gesamte Farbleitungssystem des Zerstäubers auf einem Hochspannungspotential in der Größenordnung von beispielsweise 100 kV liegen.The atomizer shown in Fig. 1 has the usual main needle valve with the valve needle 1 for opening and closing the in the atomizer bell 4 opening color channel 2. The valve needle is along its axis in the containing the color channel 2 coaxial paint tube 3 slidable. For valve actuation is a pneumatic valve actuator with a piston 6 provided to open the main needle valve at 7 with Compressed air is applied and consequently the attached to it Valve needle 1 against the force of one on its back attacking compression spring 8 in the drawing to the right pulls in the direction facing away from the atomizer bell 4. In this respect, the atomizer is known per se. In operation can the entire paint line system of the atomizer at a high voltage potential on the order of 100, for example kV lie.

Auf seiner der Ventilnadel 1 abgewandten Rückseite ist an den Kolben 6 ein Stößel- oder Schaftglied 10 angesetzt, das achsgleich mit der Ventilnadel 1 beispielsweise innerhalb der Druckfeder 8 angeordnet sein kann. Zweckmäßig am Umfang seines dem Kolben 6 abgewandten Endteils 11 hat das Schaftglied 10 darstellungsgemäß ein optisch reflektierendes Flächenelement 12. Die reflektierende Oberfläche des Elementes 12 kann eben sein und sich um den gesamten Umfang des im Querschnitt beispielsweise viereckigen Endteils des Schaftes erstrecken.On its back facing away from the valve needle 1 is on the Piston 6 a ram or shaft member 10 attached, the same axis with the valve needle 1, for example, within the Compression spring 8 can be arranged. Appropriately on the scope of his The end part 11 facing away from the piston 6 has the shaft member 10 as shown, an optically reflective surface element 12. The reflective surface of the element 12 can be flat be and around the entire circumference of the cross section, for example extend square end portion of the shaft.

Das mit dem reflektierenden Element 12 versehene Endteil 11 ist in der Zeichnung in den beiden Schaltstellungen des Hauptnadelventils dargestellt. Bei 11, 12 sind sie in der (linken) Schließstellung zu sehen, bei 11', 12' in ihrer (rechten) Ventilöffnungsstellung. Der Nadelhub H zwischen diesen beiden Schaltstellungen kann beispielsweise etwa 5 mm betragen.The end part 11 provided with the reflective element 12 is in the drawing in the two switching positions of the main needle valve shown. At 11, 12 they are in the (left) The closed position can be seen at 11 ', 12' in its (right) valve opening position. The needle stroke H between these two Switch positions can be about 5 mm, for example.

Der Schaft 10 ist in einer zu der Nadelachse koaxialen Ausnehmung 14 des Ventilgehäuses verschiebbar, in die eine radial, also quer zur Nadelachse durch das Gehäuse verlaufende Öffnung 15 führt. In der Öffnung 15 sitzt ein Halte- und Positionierungskörper 17 für zwei Lichtwellenleitereinheiten 20 und 21, deren optische Stirnflächen mit der Innenwand der Ausnehmung 14 fluchtend an den beiden Stellen liegen, an denen sich das reflektierende Element 12, 12' bei den beiden Schaltstellungen befindet. Das reflektierende Element liegt also bei geschlossenem Hauptnadelventil eng angrenzend der Stirnfläche der Lichtwellenleitereinheit 20 und bei geöffnetem Ventil der Stirnfläche der Einheit 21 gegenüber. Der gegenseitige Abstand der Mittelachsen der Einheiten 20, 21 entspricht dem Ventilnadelhub H. Infolgedessen können die beiden Schaltstellungen durch Lichtsignale gemeldet werden, die entstehen, wenn Licht durch die betreffende Lichtwellenleitereinheit von außen zugeführt, von dem Element 11, 11' reflektiert und durch die selbe Lichtwellenleitereinheit (oder eventuell einen anderen Lichtwellenleiter) zu einem opto-elektronischen Sensor (nicht dargestellt) zurückgeleitet wird, der sich außerhalb des Hochspannungsbereichs befinden kann.The shaft 10 is in a recess coaxial to the needle axis 14 of the valve housing, in which a radial, that is, an opening running transversely to the needle axis through the housing 15 leads. A holding and positioning body is seated in the opening 15 17 for two optical fiber units 20 and 21, whose optical end faces with the inner wall of the recess 14 are aligned in the two places where the reflective element 12, 12 'in the two switching positions located. The reflective element is therefore closed Main needle valve closely adjacent to the face of the Optical fiber unit 20 and with the valve open End face of the unit 21 opposite. The mutual distance the central axes of the units 20, 21 correspond to the valve needle stroke H. As a result, the two switch positions be reported by light signals that arise when light supplied from the outside by the relevant optical waveguide unit, reflected by the element 11, 11 'and through the same Optical fiber unit (or possibly another optical fiber) to an opto-electronic sensor (not shown) is returned, which is outside the high voltage range can be located.

Für den beschriebenen Zweck geeignete Lichtwellenleiter-Sensorsysteme sind an sich bekannt und bedürfen keiner weiteren Beschreibung.Optical fiber sensor systems suitable for the purpose described are known per se and require no further Description.

Statt der dargestellten Anordnung des reflektierenden Flächenelements 12 auf verschiedenen oder allen Umfangsteilen am Ende des Schaftgliedes 10, die beliebige Drehstellungen des Schaftes bezüglich der Lichtwellenleiter 20, 21 erlaubt, genügt an sich eine reflektierende Fläche nur an dem den Lichtwellenleitern zugewandten Umfangsteil. Instead of the arrangement of the reflecting surface element shown 12 on different or all circumferential parts at the end of the shaft member 10, the arbitrary rotational positions of the shaft allowed with respect to the optical fibers 20, 21 suffices there is a reflective surface only on the optical waveguide facing peripheral part.

Die Schaltstellungsabfrage kann auch an anderen Stellen der Ventilnadel selbst oder eines mit ihr verschiebbaren Baugliedes erfolgen.The switch position query can also be made at other points in the Valve needle itself or a member movable with it respectively.

Ferner kann in manchen Fällen eine einzige Lichtwellenleitereinheit zur Abfrage nur einer der beiden Schaltstellungen genügen.Furthermore, in some cases, a single optical fiber unit to query only one of the two switch positions suffice.

Statt der radialen Anordnung der Lichtwellenleiter des dargestellten Ausführungsbeispiels ist es auch möglich, einen Lichtwellenleiter axial längs des Schaftgliedes anzuordnen, dessen Schaltstellung durch unterschiedlich starke Reflexion erkannt wird.Instead of the radial arrangement of the optical fibers shown Embodiment, it is also possible to To arrange the optical waveguide axially along the shaft member, its switching position due to different levels of reflection is recognized.

Eine andere Abwandlungsmöglichkeit ist die Anordnung mindestens einer opto-elektronischen Lichtschranke beispielsweise an dem Schaftglied 10 zur potentialfreien Abfrage einer oder beider Schaltstellungen. Fig. 2 zeigt eine Ausführungsführung mit zwei radial auf entgegengesetzten Seiten des Schaftgliedes miteinander fluchtend angeordneten Lichtwellenleitern LWL1 und LWL2. In der dargestellten Schaltstellung kann der Leiter LWL2 vom Leiter LWL1 gesendete Lichtimpulse zu dem opto-elektronischen Wandler leiten, während in der anderen Stellung das Schaftgliedende die Lichtschranke schließt. Bei der Ausführungsform nach Fig. 3 können dagegen beide Schaltstellungen aktiv abgefragt werden, da hier eine radial durch das Schaftglied führende, jeweils zwischen zwei miteinander fluchtende Lichtwellenleitern LWL1, LWL2 bzw. LWL1', LWL2' positionierte Bohrung 30 vorhanden ist. Another arrangement is at least the arrangement an opto-electronic light barrier, for example the shaft member 10 for potential-free interrogation of one or both Switching positions. Fig. 2 shows an embodiment with two radially on opposite sides of the shaft member optical fibers LWL1 and FO2. In the switch position shown, the fiber LWL2 Light pulses sent by the fiber optic cable 1 to the opto-electronic Transducers conduct while in the other position End of the shaft closes the light barrier. In the embodiment 3, however, both switching positions are actively queried, as here a radial through the shaft member leading, each between two aligned Optical fibers LWL1, LWL2 or LWL1 ', LWL2' positioned Hole 30 is present.

Gemäß einer weiteren (nicht dargestellten) Möglichkeit kann das in der Zeichnung dargestellte Hauptnadelventil dahingehend abgewandelt werden, dass an oder in dem verschiebbaren Schaftglied 10 mindestens ein magnetisch wirksames Geberelement angeordnet ist, z.B. anstelle des reflektierenden Elements 12 in Fig. 1 oder der Bohrung 30 in Fig. 3. Als zur Abfrage der Schaltstellung an dem verschiebbaren Schaftglied angeordnete Sensoreinrichtung dient bei dieser Abwandlung mindestens ein den magnetooptischen Faraday-Effekt oder Kerr-Effekt nutzendes Sensorelement, das eine optische Polarisationseinrichtung mit einem Analysator enthält. Das Geberelement kann ein Dauermagnet sein, oder auch ein Element aus Eisenoder sonstigem Werkstoff mit ferromagnetischen Eigenschaften, mit dem das Magnetfeld eines in dem Sensorelement enthaltenen Magnetelements veränderbar ist. Durch Annäherung des sich mit dem Schaftglied 10 verschiebenden Geberelements kann die Polarisationsrichtung von durch die Polarisationseinrichtung geleitetem Licht in dem Sensorelement zur Erzeugung eines Lichtsignals gedreht werden. Eine an die Polarisationseinrichtung angeschlossene Lichtwellenleiteranordnung führt zu einer entfernten, außerhalb des Hochspannungsbereichs befindlichen elektronischen Einrichtung zur Erzeugung eines dem Lichtsignal entsprechenden elektrischen Signals. Das Sensorelement kann einen Reflektor enthalten, der das von der Polarisationseinrichtung kommende Licht zu dem Analysator zurückleitet, wobei sich zwischen der Polarisationseinrichtung und dem Reflektor ein Brechungselement (Faraday-Effekt-Element) oder ein Prisma befindet und an die Polarisationseinrichtung ein Lichtleiter für das dem Sensorelement zugeführte Licht und an den Analysator ein Lichtleiter für das der entfernten elektronischen Einrichtung zugeführte Licht angeschlossen sind. Derartige optische Sensoren sind an sich bekannt und im Handel erhältlich. Im hier beschriebenen Fall haben sie aber den besonderen und überraschenden Vorteil, dass sie problemlos unter Hochspannung arbeiten können. Je nach Zweckmäßigkeit können hierbei ein oder zwei Sensoren z.B. an den Stellen der Lichtwellenleiter 20 und/oder 21 in Fig. 1 angeordnet sein.According to a further possibility (not shown) the main needle valve shown in the drawing accordingly be modified that on or in the sliding Shaft member 10 at least one magnetically active sensor element is arranged, e.g. instead of the reflective element 12 in Fig. 1 or the bore 30 in Fig. 3. As for query the switching position arranged on the displaceable shaft member In this modification, the sensor device serves at least a the magneto-optical Faraday effect or Kerr effect using sensor element, which is an optical polarization device with an analyzer. The encoder element can be a permanent magnet or an element made of iron or other material with ferromagnetic properties, with which the magnetic field contained in the sensor element Magnetic element is changeable. By approximating the the shaft element 10 displacing sensor element can change the polarization direction of that passed through the polarizer Light in the sensor element for generating a light signal be rotated. One to the polarizer connected optical fiber arrangement leads to a remote, located outside the high voltage range electronic device for generating a light signal corresponding electrical signal. The sensor element can contain a reflector that from the polarizer returns incoming light to the analyzer, where between the polarizer and the reflector a refractive element (Faraday effect element) or a prism is located and an optical fiber to the polarization device for the light supplied to the sensor element and to the analyzer an optical fiber for that of the remote electronic device supplied light are connected. Such optical Sensors are known per se and are commercially available. In the case described here, however, they have the special and surprising advantage that they are easily under high voltage can work. Depending on the expediency, a or two sensors e.g. at the locations of the optical fibers 20 and / or 21 may be arranged in Fig. 1.

Insbesondere wenn an dem verschiebbaren Schaftglied 10 nur ein Lichtwellenleitereinheit angeordnet werden und beispielsweise der zweite Lichtwellenleiter 21 in Fig. 1 oder die zweite Einheit mit den Lichtwellenleitern LWL1', LWL2' in Fig. 3 eingespart werden sollen, kann es zweckmäßig sein, dass an dem verschiebbaren Schaftglied 10 zwei in der Verschiebungsrichtung voneinander beabstandete Signalerzeugungselemente vorgesehen sind, von denen das erste Element ein Binärsignal der Sensoreinrichtung auslöst, wenn sich die Ventilnadel 1 in ihrer einen Schaltstellung befindet, während das zweite Signalerzeugungselement ein Binärsignal der Sensoreinrichtung auslöst, wenn sich die Ventilnadel 1 in ihrer anderen Schaltstellung befindet. Entsprechend Fig. 1 bzw. Fig. 3 können die beiden Signalerzeugungselemente durch reflektierende Flächen gebildet sein, zwischen denen sich eine nicht oder weniger reflektierende Fläche befindet, bzw. durch beabstandete Lichtschrankenöffnungen. Auch eine Ausführungsform mit zwei im Schaftglied 10 beabstandeten Dauermagneten oder magnetisch wirksamen Geberelementen für das oben beschriebene Faraday-Effekt oder Kerr-Effekt-Sensorsystem ist möglich.In particular, if only on the displaceable shaft member 10 Optical fiber unit can be arranged and for example the second optical fiber 21 in Fig. 1 or the second unit saved with the optical fibers LWL1 ', LWL2' in Fig. 3 should be, it may be appropriate that the movable Shaft member 10 two in the direction of displacement spaced apart signal generating elements are provided are, of which the first element is a binary signal of the sensor device triggers when the valve needle 1 in one Switch position is during the second signal generating element triggers a binary signal from the sensor device, when the valve needle 1 is in its other switching position located. According to Fig. 1 and Fig. 3, the two Signal generating elements formed by reflecting surfaces between which there is no or less reflective Surface is located, or through spaced light barrier openings. An embodiment with two in the shaft member 10 spaced permanent magnets or magnetically active transmitter elements for the Faraday effect described above or Kerr effect sensor system is possible.

Die von dem Sensor bei den beiden Schaltstellungen jeweils ausgelösten Binärsignale haben zweckmäßig denselben Binärwert. Die Binärsignale werden von der elektronischen Sensoreinrichtung erzeugt, die sich an einer von dem Ventil entfernten Stelle außerhalb des Hochspannungsbereiches befindet und mit der Ventileinheit über die Lichtwellenleiteranordnung verbunden ist. Wenn das Schaftglied 10 zwischen seinen beiden Stellungen verschoben wird, ändert sich das Sensorsignal aufgrund des zwischen den beiden Signalerzeugungselementen liegenden Bereiches zunächst in den entgegengesetzten Binärwert, bevor bei Erreichen der anderen Ventilstellung wieder der erste Binärwert erzeugt wird. Mit Hilfe einer elektronischen Kontrolleinrichtung kann festgestellt werden, ob beispielsweise nach Erzeugen eines Steuersignals zum Umschalten des Ventils (und nach dem Verschwinden des ersten Binärwerts) innerhalb einer vorgeschriebenen Zeit erneut der erste Binärwert als Meldung der anderen Ventilstellung erzeugt wird. Ist das nicht der Fall, liegt eine Störung vor, die durch ein Alarmsignal gemeldet wird.The one from the sensor in the two switch positions triggered binary signals expediently have the same binary value. The binary signals are from the electronic sensor device generated at a distance from the valve Location outside the high voltage range and with connected to the valve unit via the optical fiber arrangement is. If the shaft member 10 between its two positions is shifted, the sensor signal changes due to the lying between the two signal generating elements Range first in the opposite binary value before the first binary value again when the other valve position is reached is produced. With the help of an electronic control device can be determined whether, for example, after Generating a control signal for switching the valve (and after the disappearance of the first binary value) within a prescribed time again the first binary value as a message the other valve position is generated. Isn't that Case, there is a fault, which is reported by an alarm signal becomes.

Claims (14)

Ventileinheit für eine elektrostatische Anlage zur Serienbeschichtung von Werkstücken
   mit einem ferngesteuert umschaltbaren Ventil, dessen bewegbares Ventilglied (1) zwischen zwei Schaltstellungen verschiebbar ist und in der einen Schaltstellung den Weg für ein durch das Ventil fließendes Medium freigibt, während das Ventil geschlossen ist, wenn sich das Ventilglied (1) in seiner anderen Schaltstellung befindet,
   insbesondere für einen im Betrieb unter Hochspannung stehenden Zerstäuber,
   dadurch gekennzeichnet, daß zur Abfrage der Schaltstellung des Ventils und zur Erzeugung eines entsprechenden Abfragesignals eine opto-elektronische Sensoreinrichtung mit mindestens einem Lichtwellenleiter (20, 21) an einem mit dem Ventilglied (1) verschiebbaren oder einen Teil des Ventilglieds bildenden Bauglied (10) vorgesehen ist.Valve unit for an electrostatic system for the serial coating of workpieces
with a remotely switchable valve, the movable valve member (1) of which is displaceable between two switching positions and in the one switching position clears the way for a medium flowing through the valve, while the valve is closed when the valve member (1) is in its other switching position is,
especially for an atomizer that is under high voltage during operation,
characterized in that an opto-electronic sensor device with at least one optical waveguide (20, 21) is provided on a member (10) which is displaceable with the valve member (1) or forms part of the valve member in order to query the switching position of the valve and to generate a corresponding query signal is. Ventileinheit nach Anspruch 1, dadurch gekennzeichnet, daß das verschiebbare Bauglied (10) mindestens eine optisch reflektierende Fläche (12) hat, die der Sensorfläche des Lichtwellenleiters (20, 21) gegenübersteht, wenn sich das Ventilglied (1) in seiner zu meldenden Schaltstellung befindet.Valve unit according to claim 1, characterized in that the displaceable member (10) has at least one optically reflecting surface (12) which faces the sensor surface of the optical waveguide (20, 21) when the valve member (1) is in its switching position to be reported , Ventileinheit nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß für jede der Schaltstellungen je eine optoelektronische Sensoreinrichtung mit jeweils mindestens einem Lichtwellenleiter (20, 21) vorgesehen ist. Valve unit according to claim 1 or 2, characterized in that an optoelectronic sensor device with at least one optical waveguide (20, 21) is provided for each of the switching positions. Ventileinheit nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß das bewegbare Ventilglied (1) die Ventilnadel eines Nadelventils ist.Valve unit according to one of claims 1-3, characterized in that the movable valve member (1) is the valve needle of a needle valve. Ventileinheit nach Anspruch 4, dadurch gekennzeichnet, daß das verschiebbare Bauglied (10) ein mit der Ventilnadel (1) achsgleich an den Kolben (6) des pneumatischen Ventilantriebs angesetztes Schaftglied ist, das in einer Ausnehmung (14) des Ventilgehäuses verschiebbar ist, in die eine bezüglich der Nadelachse radiale Öffnung (15) für den oder die Lichtwellenleiter (20, 21) führt.Valve unit according to Claim 4, characterized in that the displaceable member (10) is a shaft member which is attached to the piston (6) of the pneumatic valve drive in the same axis as the valve needle (1) and which is displaceable in a recess (14) in the valve housing into which a radial opening (15) for the optical fiber (s) (20, 21) leads with respect to the needle axis. , Ventileinheit nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß das bewegbare Ventilglied mit der Membran eines Membranventils verbunden ist., Valve unit according to one of claims 1-3, characterized in that the movable valve member is connected to the membrane of a membrane valve. Ventileinheit nach Anspruch 1, dadurch gekennzeichnet, daß die Lichtwellenleiter (LWL1, LWL2) mindestens eine Lichtschranke für das Bauglied (10) bilden.Valve unit according to claim 1, characterized in that the optical waveguides (LWL1, LWL2) form at least one light barrier for the member (10). Ventileinheit nach Anspruch 1, dadurch gekennzeichnet, dass an oder in dem verschiebbaren Bauglied (10) ein magnetisch wirksames Geberelement angeordnet ist,
dass ein Sensorelement vorgesehen ist, das eine optische Polarisationseinrichtung enthält,
dass durch Annäherung des Geberelements die Polarisation von durch die Polarisationseinrichtung geleitetem Licht in dem Sensorelement magnetooptisch zur Erzeugung eines Lichtsignals verändert wird,
und dass an die Polarisationseinrichtung eine Lichtwellenleiteranordnung angeschlossen ist, die zu einer entfernten elektronischen Einrichtung zur Erzeugung eines dem Lichtsignal entsprechenden elektrischen Signals führt. Valve unit according to claim 1, characterized in that a magnetically active transmitter element is arranged on or in the displaceable member (10),
that a sensor element is provided which contains an optical polarization device,
that the proximity of the transmitter element changes the polarization of light conducted through the polarization device in the sensor element magneto-optically to generate a light signal,
and that an optical waveguide arrangement is connected to the polarization device, which leads to a remote electronic device for generating an electrical signal corresponding to the light signal. Ventileinheit nach Anspruch 8, dadurch gekennzeichnet, dass das Sensorelement einen Reflektor enthält, der das von der Polarisationseinrichtung kommende Licht zu einem Analysator der Polarisationseinrichtung zurückleitet, wobei sich zwischen der Polarisationseinrichtung und dem Reflektor ein die Polarisationsrichtung drehendes Brechungselement oder Prisma befindet, und dass an die Polarisationseinrichtung ein Lichtleiter für das dem Sensorelement zugeführte Licht und ein Lichtleiter für das der elektronischen Einrichtung zugeführte Licht angeschlossen sind.Valve unit according to claim 8, characterized in that the sensor element contains a reflector which returns the light coming from the polarization device to an analyzer of the polarization device, wherein between the polarization device and the reflector there is a refractive element or prism rotating the polarization direction, and that to the A light guide for the light supplied to the sensor element and a light guide for the light supplied to the electronic device are connected to the polarization device. Ventileinheit nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass an dem verschiebbaren Bauglied (10) zwei in der Verschiebungsrichtung voneinander beabstandete Signalerzeugungselemente vorgesehen sind, von denen das erste Element ein Binärsignal der Sensoreinrichtung auslöst, wenn sich das Ventilglied (1) in seiner einen Schaltstellung befindet, während das zweite Signalerzeugungselement ein Binärsignal der Sensoreinrichtung auslöst, wenn sich das Ventilglied (1) in seiner anderen Schaltstellung befindet.Valve unit according to one of the preceding claims, characterized in that on the displaceable member (10) there are two signal generating elements spaced apart in the displacement direction, of which the first element triggers a binary signal of the sensor device when the valve member (1) is in its one switching position is while the second signal generating element triggers a binary signal of the sensor device when the valve member (1) is in its other switching position. Ventileinheit nach Anspruch 10, dadurch gekennzeichnet, dass die beiden Signalerzeugungselemente des verschiebbaren Baugliedes (10) durch optisch reflektierende Flächen gebildet sind.Valve unit according to claim 10, characterized in that the two signal generating elements of the displaceable member (10) are formed by optically reflecting surfaces. Ventileinheit nach Anspruch 10, dadurch gekennzeichnet, dass die beiden Signalerzeugungselemente durch Lichtschrankenöffnungen gebildet sind.Valve unit according to claim 10, characterized in that the two signal generating elements are formed by light barrier openings. Ventileinheit nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass die beiden Binärsignale denselben Binärwert haben, und dass das Sensorsignal der Sensoreinrichtung auf den entgegengesetzten Binärwert umgeschaltet wird, wenn das verschiebbare Bauglied (10) zwischen seinen beiden Stellungen verschoben wird.Valve unit according to one of claims 10 to 12, characterized in that the two binary signals have the same binary value, and that the sensor signal of the sensor device is switched to the opposite binary value when the displaceable member (10) is moved between its two positions. Ventileinheit nach einem der Ansprüche 10 bis 13, gekennzeichnet durch eine elektronische Kontrolleinrichtung, mit der festgestellt wird, ob das Binärsignal innerhalb einer vorgegebenen Zeit nach dem Erzeugen eines Steuersignals zum Umschalten des Ventils erscheint, und dass andernfalls ein Alarmsignal erzeugt wird.Valve unit according to one of claims 10 to 13, characterized by an electronic control device with which it is determined whether the binary signal appears within a predetermined time after the generation of a control signal for switching the valve, and that an alarm signal is otherwise generated.
EP02006090A 2001-03-29 2002-03-18 Valve unit for an electrostatic coating installation Expired - Lifetime EP1245291B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10115472 2001-03-29
DE10115472A DE10115472A1 (en) 2001-03-29 2001-03-29 Valve unit for use in electrostatic painting apparatus has an optoelectronic sensor device with light wave conductors and an optoelectronic sensor to sense an indexing position and to generate a corresponding sensing signal.
DE10161549 2001-12-14
DE10161549 2001-12-14

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EP1245291A2 true EP1245291A2 (en) 2002-10-02
EP1245291A3 EP1245291A3 (en) 2005-01-26
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AT (1) ATE342774T1 (en)
DE (1) DE50208463D1 (en)
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WO2008037456A1 (en) 2006-09-27 2008-04-03 Dürr Systems GmbH Electrostatic spraying arrangement
DE102006045631A1 (en) * 2006-09-27 2008-04-10 Dürr Systems GmbH Sprayer arrangement for coating machine for series-wise electrostatic coating of workpiece, e.g. motor vehicle body or parts, has transformer arrangement that has high voltage-isolation device between primary and secondary circuits
DE102007004819A1 (en) 2007-01-31 2008-08-21 Dürr Systems GmbH Sprayer arrangement for coating machine for series-wise electrostatic coating of workpiece, e.g. motor vehicle body or parts, has transformer arrangement that has high voltage-isolation device between primary and secondary circuits
US8333164B2 (en) 2006-12-12 2012-12-18 Duerr Systems, Gmbh Coating apparatus comprising a metering device
US9016596B2 (en) 2007-07-20 2015-04-28 Durr Systems Gmbh Method for process diagnosis and rotary atomizer arrangement

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DE102006058562A1 (en) 2006-12-12 2008-08-14 Dürr Systems GmbH Coating device for serially coating workpieces with different shades comprises a separate color changer containing color valves to which are connected color lines for the coating material

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008037456A1 (en) 2006-09-27 2008-04-03 Dürr Systems GmbH Electrostatic spraying arrangement
DE102006045631A1 (en) * 2006-09-27 2008-04-10 Dürr Systems GmbH Sprayer arrangement for coating machine for series-wise electrostatic coating of workpiece, e.g. motor vehicle body or parts, has transformer arrangement that has high voltage-isolation device between primary and secondary circuits
US8485125B2 (en) 2006-09-27 2013-07-16 Dürr Systems GmbH Electrostatic spraying arrangement
US8333164B2 (en) 2006-12-12 2012-12-18 Duerr Systems, Gmbh Coating apparatus comprising a metering device
DE102007004819A1 (en) 2007-01-31 2008-08-21 Dürr Systems GmbH Sprayer arrangement for coating machine for series-wise electrostatic coating of workpiece, e.g. motor vehicle body or parts, has transformer arrangement that has high voltage-isolation device between primary and secondary circuits
US9016596B2 (en) 2007-07-20 2015-04-28 Durr Systems Gmbh Method for process diagnosis and rotary atomizer arrangement

Also Published As

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ATE342774T1 (en) 2006-11-15
EP1245291A3 (en) 2005-01-26
EP1245291B1 (en) 2006-10-18
ES2272593T3 (en) 2007-05-01
DE50208463D1 (en) 2006-11-30

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