EP1250962B1 - Procédé de commande du fonctionnement d'une installation de revêtement électrostatique - Google Patents

Procédé de commande du fonctionnement d'une installation de revêtement électrostatique Download PDF

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Publication number
EP1250962B1
EP1250962B1 EP02007857A EP02007857A EP1250962B1 EP 1250962 B1 EP1250962 B1 EP 1250962B1 EP 02007857 A EP02007857 A EP 02007857A EP 02007857 A EP02007857 A EP 02007857A EP 1250962 B1 EP1250962 B1 EP 1250962B1
Authority
EP
European Patent Office
Prior art keywords
voltage
coating
current
voltage generator
control system
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
EP02007857A
Other languages
German (de)
English (en)
Other versions
EP1250962A2 (fr
EP1250962A3 (fr
Inventor
Hans-Jürgen Dr. Nolte
Frank Herre
Harry Krumma
Michael Baumann
Stefano Giuliano
Rainer Melcher
Manfred Michelfelder
Peter Hofmann
Meinhard Lutsch
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.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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Filing date
Publication date
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1250962A2 publication Critical patent/EP1250962A2/fr
Publication of EP1250962A3 publication Critical patent/EP1250962A3/fr
Application granted granted Critical
Publication of EP1250962B1 publication Critical patent/EP1250962B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to a method for controlling the operation of an electrostatic coating system and such a system suitable for carrying out the method.
  • it may be a plant for the electrostatic serial coating of workpieces such as vehicle bodies.
  • the power and regulation of the high voltage cascade be designed so that at constant voltage the necessary peak current or at constant current the necessary peak voltage is available in every painting situation. This can be achieved by "stiff", dynamic control behavior. Only in certain cases, eg. B. dangerous approach of the atomizer to the grounded workpiece or even in the coating of workpiece parts that are prone to high voltage flashovers or excessive overcoating on certain surfaces, increase current or voltage to limits that can not be exceeded due to the performance of the cascade, so that the regulation "breaks down" and the setpoint is no longer reached because the power of the cascade no higher current or voltage value allows. To avoid dangers, the cascade can also be switched off before limit values are exceeded.
  • the cascades of the known coating systems can be switched between voltage stability operation and current stability operation. Depending on the setting, it is also possible to change the maximum permissible voltage or the maximum permitted current by manual switching.
  • the known systems do not always allow the best combinations of voltage and current for optimum charging of the sprayed coating material, especially when changing operating conditions.
  • EP 1 046 918 A discloses a system for the safety checking of an electrostatic coating system, in which the drop in residual energy remaining after switching off the high voltage generator is checked by simulating current and voltage by test signals. Also in this system, the high voltage and the operating current are limited to predetermined maximum values during operation.
  • the invention has for its object to enable a better adaptation of the coating device supplied voltage and current values to the respective operating conditions. In particular, for example, if only a low voltage is possible, the coating device to compensate for the highest possible current be supplied, and vice versa.
  • the invention is based on the recognition that the best possible product of these parameters (UxI) can always be set for optimum charging by variable setting of limit values for both the current and the voltage, and can be complied with as far as possible. This is achieved in contrast to known systems not simply by constant current control or voltage stability control, but by the specification of defined values of both the voltage and the current.
  • the one parameter eg the Voltage
  • a maximum limit value can be specified as the setpoint, which is maintained during the coating process, as long as the also predetermined limit value for the other parameter (in this case the current) is not exceeded.
  • the parameter can remain constant at the specified limit or setpoint value, but it can also fluctuate due to the operating conditions (ie it is only "quasi" constant).
  • the limit value of the other parameter can be reached, the parameter at the target value can be controlled down to the required extent by the control circuit of the cascade, ie it drops below its own limit and the previous reference value due to this active control.
  • the limit value of at least one of the two parameters for adapting the coating operation to different coating devices, coating tasks or other operating conditions can be changed in particular by signals of a higher-level control system controlling the high-voltage generator.
  • the change can be made in stages by automatically switching the cascade through the higher-level control system of the plant.
  • z. B. an interior of the body to be painted there are other operating conditions, since the typical there small distances between atomizer and workpiece allow only low voltages. Therefore, the threshold value for the current is now reduced and, as soon as it is reached during operation, exceeded by down-regulation prevents the tension. Instead of the previous stiff or "hard” control characteristic, this results in a "softer” regulation.
  • Another example is the change between rotary and air atomizers on a coating machine.
  • the drawing shows in the lower part of the three predetermined along the time axis t successively from stage to stage smaller current limit Imax 1 , Imax 2 and Imax 3 and in the upper part of the associated maximum Umax 1 , Umax 2 or Umax 3 of the voltage U, whose actually resulting time course is shown.
  • the mentioned exterior painting takes place. If the current limit is then reduced to Imax 2 for painting other areas, assuming that the limit is reached and exceeded, the voltage will inevitably return to the corresponding value Umax 2 , since it is regulated down to the appropriate extent by the control system of the cascade becomes. For painting a further area z.
  • the current limit is reduced to an even lower value Imax 3 at time t 2 and consequently set the illustration according to only low corresponding voltage Umax 3 .
  • the higher-level controller can also change the predetermined voltage limit (not shown), whereupon the current can then follow these changes in a similar manner as in the illustrated example, the voltage is the current limit values.
  • control variables By defining the control variables, almost any characteristics can be created that are adapted to the respective application or other operating conditions, such as the type of paint, atomizer, material, painting distance, coating speed, workpiece geometry, type of paint, air humidity, etc.
  • the setpoint and limit values for voltage and current can be preset in the system described here by stored data of the superordinate program control system of the coating installation and called up to control the cascade. Different available limits can also in one stored own data storage of the control system of the high voltage generator and retrieved as needed, ie depending on the desired characteristic of the parent control.
  • both the actual voltage at the atomizer and its current are constantly measured and compared with the preset desired and limit values.
  • the operational amplifiers which are conventional in the control system for controlling the high voltage are suitable.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Photoreceptors In Electrophotography (AREA)

Claims (7)

  1. Procédé pour la commande d'exploitation d'une installation de revêtement électrostatique, dont le dispositif de revêtement est alimenté par un générateur de haute tension en courant et en tension de grandeur contrôlable,
    caractérisé en ce que des valeurs limites, qui ne doivent pas être dépassées pendant une opération de revêtement, sont prédéfinies par paires pour la tension et pour le courant pour le réglage d'un produit de la tension et du courant, choisi pour le rechargement optimal du matériau de revêtement, par des signaux de données commandant le générateur de haute tension,
    et en ce que, lorsqu'on atteint la valeur limite d'un de ces paramètres, son dépassement est empêché par une réduction automatique de l'autre paramètre respectif pendant le revêtement ultérieur.
  2. Procédé selon la revendication 1, caractérisé en ce que la valeur limite d'au moins un des deux paramètres est modifiée par des signaux d'un système de commande prioritaire commandant le générateur de haute tension pour l'adaptation de l'exploitation de revêtement à différents dispositifs de revêtement, tâches de revêtement ou autres conditions de service.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que des valeurs de consigne pour le courant et/ou la tension sont prédéfinies par des signaux d'un système de commande prioritaire commandant le générateur de haute tension en fonction des conditions de service respectives.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les valeurs limites préréglables sont prédéfinies comme valeur de consigne.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les valeurs de consigne et/ou les valeurs limites sont déposées dans un système de stockage de données et sont choisies automatiquement par un système de commande de programme.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la valeur limite d'au moins l'un des deux paramètres est modifiée automatiquement pendant le revêtement pour l'optimisation du processus de revêtement.
  7. Installation de revêtement pour le revêtement en série de pièces avec un dispositif de revêtement électrostatique, qui est raccordé ou peut être raccordé à un générateur de haute tension pour le rechargement du matériau de revêtement pulvérisé ou contient ce générateur,
    et avec un système de commande pour la commande du générateur de haute tension,
    le système de commande ou le générateur de haute tension contenant un système de stockage de données dans lequel sont déposées différentes valeurs limites aussi bien pour la tension à générer par le générateur de haute tension que pour le courant à amener au dispositif de revêtement,
    le circuit de production de courant du générateur de haute tension pouvant être commandé avec les données de valeurs limites de tension et de courant stockées et pouvant être choisies par le système de commande,
    et le produit de la tension et du courant choisi pour le rechargement optimal étant établi par la spécification par paires des valeurs limites pour la tension et pour le courant.
EP02007857A 2001-04-20 2002-04-08 Procédé de commande du fonctionnement d'une installation de revêtement électrostatique Expired - Lifetime EP1250962B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10119521A DE10119521A1 (de) 2001-04-20 2001-04-20 Verfahren zur Betriebssteuerung einer elektrostatischen Beschichtungsanlage
DE10119521 2001-04-20

Publications (3)

Publication Number Publication Date
EP1250962A2 EP1250962A2 (fr) 2002-10-23
EP1250962A3 EP1250962A3 (fr) 2005-03-16
EP1250962B1 true EP1250962B1 (fr) 2006-07-26

Family

ID=7682173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007857A Expired - Lifetime EP1250962B1 (fr) 2001-04-20 2002-04-08 Procédé de commande du fonctionnement d'une installation de revêtement électrostatique

Country Status (4)

Country Link
EP (1) EP1250962B1 (fr)
AT (1) ATE333945T1 (fr)
DE (2) DE10119521A1 (fr)
ES (1) ES2267882T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009013561A1 (de) * 2009-03-17 2010-10-07 Dürr Systems GmbH Überwachungsverfahren und Überwachungseinrichtung für eine elektrostatische Beschichtungsanlage
DE102009051877A1 (de) 2009-11-04 2011-05-05 Dürr Systems GmbH Beschichtungsverfahren und Beschichtungsanlage mit dynamischer Anpassung der Zerstäuberdrehzahl und der Hochspannung
US8861228B2 (en) 2009-12-07 2014-10-14 Durr Systems Gmbh High voltage controller with improved monitoring and diagnostics

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2144202B2 (de) * 1971-09-03 1975-02-13 Emil 7400 Tuebingen Zeile Verfahren und einrichtung zur verhinderung einer ueberschlagbildung in anlagen mit hochspannungsfeldern, insbesondere farbspritzanlagen und pulverspruehanlagen
DE3416093A1 (de) * 1984-04-30 1985-10-31 J. Wagner AG, Altstätten Elektronischer hochspannungserzeuger fuer elektrostatische spruehgeraete
FR2587919B1 (fr) 1985-10-02 1988-05-27 Sames Sa Appareil de projection electrostatique protege contre l'apparition d'arcs electriques
DE3709510A1 (de) 1987-03-23 1988-10-06 Behr Industrieanlagen Verfahren zur betriebssteuerung einer elektrostatischen beschichtungsanlage
DE19511254A1 (de) * 1995-03-27 1996-10-02 Gema Volstatic Ag Elektrostatische Sprühbeschichtungseinrichtung
DE19915374A1 (de) * 1999-04-06 2000-10-12 Schnier Elektrostatik Gmbh Verfahren und Schaltungsanordnung zur Sicherheitsüberprüfung einer elektrostatischen Sprühanlage

Also Published As

Publication number Publication date
EP1250962A2 (fr) 2002-10-23
ES2267882T3 (es) 2007-03-16
EP1250962A3 (fr) 2005-03-16
ATE333945T1 (de) 2006-08-15
DE50207590D1 (de) 2006-09-07
DE10119521A1 (de) 2002-10-24

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