EP0455111B1 - Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur - Google Patents

Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur Download PDF

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Publication number
EP0455111B1
EP0455111B1 EP91106544A EP91106544A EP0455111B1 EP 0455111 B1 EP0455111 B1 EP 0455111B1 EP 91106544 A EP91106544 A EP 91106544A EP 91106544 A EP91106544 A EP 91106544A EP 0455111 B1 EP0455111 B1 EP 0455111B1
Authority
EP
European Patent Office
Prior art keywords
intermediate container
container
installation
coating
valve
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
EP91106544A
Other languages
German (de)
English (en)
Other versions
EP0455111A1 (fr
Inventor
Rolf Schneider
Kurt Dipl.-Ing. Vetter
Fred Luderer
Michael Baumann
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 GmbH
Original Assignee
Duerr GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Duerr GmbH filed Critical Duerr GmbH
Publication of EP0455111A1 publication Critical patent/EP0455111A1/fr
Application granted granted Critical
Publication of EP0455111B1 publication Critical patent/EP0455111B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom

Definitions

  • the invention relates to a system according to the preamble of claim 1.
  • the spray head of rotary atomizers or the like is connected to high voltage in order to thereby generate the field which charges the sprayed coating particles between the spray head and the grounded object to be coated.
  • a coating material of high electrical conductivity such as the environmentally friendly water-soluble paints
  • the insulation resistance via the line connecting the spray head to the paint supply system is too low if the supply system is at ground potential.
  • the supply system which usually consists of ring lines for the individual colors, is to be grounded, since otherwise not only would considerable expenditure of insulation be required, but there would also be a risk of explosive discharges due to the large electrical capacity.
  • a separate storage container for each color, which is arranged insulated from earth and from the other containers and via a color changer and a connecting line which is at high voltage potential horizontal spray device feeds.
  • the connecting line is flushed with a given color and before changing to a different color with solvent (water) and dried with compressed air in order to maintain the required insulation for the container subsequently connected to the spraying device.
  • solvent water
  • this system is structurally complex and bulky. There are also color losses when emptying and flushing the insulating lines and the need to dispose of the flushing agent.
  • the same problem occurs with a method known from DE-A-37 17 929, in which the color changer of an earthed supply system leads to an intermediate container and from there leads to the spraying device for electrical insulation and is dried.
  • the invention has for its object to provide a system that requires little space and little construction.
  • the invention has the advantage that you can get by with a convenient design of the system with a single intermediate container (for each of the selectable coating materials of different colors and possibly per "level" of several atomizers in a spray booth), without this configuration being necessary when Fill the intermediate container to switch off the high voltage.
  • the system can be made even simpler if the high voltage is switched off when the intermediate container is being filled.
  • an additional storage container serving as a buffer is connected downstream of the outlet of the intermediate container, one is no longer dependent on coating breaks for the movements of the intermediate container; this also gives the possibility of a single common intermediate container arrangement (per color) for all connected atomizers, e.g. to be used for all "levels" consisting of several atomizers in one spray booth.
  • an earthed supply system of which only one filling valve 1 with a material supply line 2 is shown, is intended to supply a device, which is connected to a coating device which is at high voltage during operation and, in the example shown, contains a removal valve 4 with a line 5 leading to the coating device (not shown).
  • An intermediate container 7 is used for electrical insulation between the grounded supply system and the device connected to high voltage, which is periodically filled alternately by the supply system in a manner known per se, the contents of which are grounded, and then emptied in the direction of the coating device, the contents of which the high voltage of the coating device is charged and isolated from the supply system.
  • the intermediate container 7 shown is an elongated, with the exception of closable inlets and outlets for coating material and air completely closed cylinder with a round, flat or any other cross-section, which is pivotally mounted about a horizontal axis 8 lying transversely to its longitudinal axis, for example on a Foot 9 made of insulating material standing vertically on the floor. According to a practical example, it can be dimensioned for a content of about 4 liters.
  • the intermediate container 7 is mounted approximately at the middle between its two ends, at each of which there is a valve 11 or 12, of which one valve 11 serves as the inlet and the other valve 12 serves as the outlet of the intermediate container 7.
  • the valve 11 can be coupled and detached from the fixed filling valve 1, while the valve 12 can be detachably coupled in a similar manner to the removal valve 4, which stands on an isolator 14, since it is separated from the conductive coating material by the Sprayer leading line at Coating operation is placed on high voltage.
  • the mouths of the valves 11 and 12 are inclined in the pivoting plane of the intermediate container 7 as shown at such an angle against the longitudinal axis of the container that they are aligned with the mouth of the fixed valve 1 or 4 when coupling.
  • Coupling together can be facilitated by conical or appropriately funnel-shaped design of the mouths.
  • By appropriate design of the valves can be ensured that when coupling together a liquid-tight liquid connection between the valve 11 and the line 2 or between the valve 12 and the line 5 and the valves 11 and 12 and 1 and 4 each automatically close when the valve 11 or 12 is uncoupled by the pivoting movements of the intermediate container 7 and pivoted away.
  • a preferably pneumatic piston-cylinder unit 14 is provided, which is located on the one hand on the foot 9 and on the other hand is supported on the intermediate container 7.
  • the arrangement shown can be in its entirety, that is to say including the additional intermediate containers required for further selectable coating materials of a different color, in a completely closed housing 16 made of insulating material, which is arranged on one side or preferably as part of a spray booth.
  • the line 5 is led through the wall of this housing into the spray booth, where it can supply at least one "level" from several atomizers.
  • the height of the housing 16 can be of the order of 1 m.
  • the distance between the grounded fill valve and the inlet valve 11 of the The intermediate container 7 is sufficiently larger than the flashover distance of the high voltage applied when the intermediate container is pivoted into the emptying position shown.
  • the intermediate container 7 can be quickly and easily pivoted into its filling position and pivoted back into the emptying position shown, for which purpose the coating breaks can be used, for example, in the embodiment shown, in which the group of spray devices of a "level" after coating a vehicle body in a spray booth waiting for the next body.
  • Filling the intermediate container 7 through the supply system, which is usually under pressure (e.g. 6.105 Pa, i.e. 6 bar), via the automatically connectable valves 1 and 11 requires little time.
  • the intermediate container 7 For emptying the intermediate container 7, it can be expediently placed under regulated pressure, which has the advantage that it does not have to be followed by a pump or the like provided for this purpose.
  • the intermediate container 7 is designed to be pressure-tight and, when emptied, it is closed air-tight and provided with an inlet valve (not shown) for compressed air. Furthermore, a vent valve (also not shown) is provided for the filling process.
  • the pressure set in the intermediate container 7 is expediently lower than that of the supply system, e.g. about 2-4.5.105 Pa.
  • the illustrated embodiment can be simplified to the extent that the intermediate container 7 instead of the couplable valves 12 and 4 at its outlet is also constantly liquid-tight could be connected to the line 5 leading to the coating device.
  • This connection would then be arranged to be movable or flexible so that it could follow the pivoting movements of the intermediate container; for example, it could consist of a flexible piece of hose firmly connected to the intermediate container. It may be more convenient to move the pivot axis of the intermediate container in the vicinity of its outlet end.
  • the conductive coating material in operation always leads to a conductive connection from the coating device to the intermediate container, the high voltage is switched off when the intermediate container is filled, for example during the above-mentioned coating breaks in a spray booth.
  • the intermediate container 7 which serves as a buffer container for supplying the coating device when the intermediate container is being filled and enables non-stop coating operation.
  • the buffer tank (not shown) could be connected to line 5, for example.
  • a buffer container is particularly useful in the illustrated embodiment with the outlet of the intermediate container 7 that can be uncoupled from the removal valve 4. If the buffer tank e.g. is connected to this at the end of line 5 or at another point, there is the possibility, during breaks in operation, to periodically pressurize line 5 by periodically changing pressure of the buffer store, whereby line 5 prevents the coating material from settling and its viscosity can be maintained .

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (10)

  1. Installation de revêtement, pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur de l'électricité, comportant :
    un système d'alimentation (1) placé à un faible potentiel ou au potentiel de la terre,
    un dispositif de revêtement (7) déplaçable entre deux positions,
    auquel le matériau de revêtement est amené, dans la première position, au moyen d'une admission (11), par une sortie du système du système d'alimentation (1),
    et dispositif de revêtement qui, dans sa deuxième position, dans laquelle son contenu est isolé électriquement de la sortie du système d'alimentation (1), envoie le matériau de revêtement dans un dispositif (4) relié au dispositif de revêtement, caractérisée en ce que le récipient intermédiaire (7) est un cylindre allongé fermé, qui peut basculer entre ses deux positions autour d'un axe (8) perpendiculaire à l'axe longitudinal.
  2. Installation selon la revendication 1, caractérisée en ce que la sortie du système d'alimentation est constituée par une soupape de remplissage (1) fixe, à l'aide de laquelle une soupape (11), constituant l'admission du récipient intermédiaire (7), peut être couplée de façon étanche aux liquides, dans la première position de basculement, pour remplir le récipient intermédiaire, et en ce que les soupapes (1, 11) se ferment automatiquement lors du basculement du récipient intermédiaire (7) dans la deuxième position.
  3. Installation selon la revendication 1 ou 2, caractérisée en ce que l'admission du dispositif, reliée au dispositif de revêtement, est constituée par une soupape de prélèvement (4) fixe, à l'aide de laquelle une soupape (12), constituant la sortie du récipient intermédiaire (7), peut être couplée automatiquement, de façon étanche aux liquides, dans la deuxième position de basculement destinée à vider le récipient intermédiaire (7), et en ce que ces soupapes (4, 12) se ferment automatiquement, lors du basculement du récipient intermédiaire (7) dans la première position.
  4. Installation selon la revendication 1 ou 2, caractérisée en ce que la sortie du récipient intermédiaire (7) est reliée en fonctionnement, en permanence, de façon étanche aux liquides, à une conduite (5) menant au dispositif de revêtement, et en ce que cette liaison est disposée déplaçable ou flexible, de façon à suivre les mouvements de basculement du récipient intermédiaire (7).
  5. Installation selon l'une des revendications précédentes, caractérisée en ce qu'à une extrémité et/ou à l'autre extrémité, opposée, du récipient intermédiaire (7) est prévue une soupape (1, 12) dont l'embouchure est orientée dans le plan de basculement du récipient intermédiaire (7), avec un angle, par rapport à l'axe longitudinal du récipient, tel qu'elle est alignée par rapport à une soupape (1, 4) fixe, lors de son couplage à celle-ci.
  6. Installation selon l'une des revendications précédentes, caractérisée en ce que le récipient intermédiaire (7) est monté sur un pied palier (9) en matériau isolant et peut pivoter, sous l'effet d'un ensemble à piston et cylindre (14).
  7. Installation selon l'une des revendications précédentes, caractérisée en ce que le récipient intermédiaire (7) et son mécanisme de basculement sont disposés dans un carter (16) en matériau isolant, faisant partie d'une cabine de pulvérisation, et une conduite (5) menant, dans la cabine de pulvérisation, au dispositif de revêtement, depuis la sortie du récipient intermédiaire (7) ou une soupape (4) pouvant être couplée avec celui-ci.
  8. Installation selon l'une des revendications précédentes, caractérisée en ce que le récipient intermédiaire (7) est obturable de façon étanche à l'air et est réalisé pour résister à la pression, comporte des soupapes d'admission, de sortie, pour l'air, et peut être vidé par utilisation d'air comprimé.
  9. Installation selon l'une des revendications précédentes, caractérisée en ce que le dispositif, alimenté par le récipient intermédiaire (7), relié au dispositif de revêtement, contient un récipient de stockage supplémentaire, faisant office de récipient tampon pour alimenter le dispositif de revêtement lors du remplissage du récipient intermédiaire (7).
  10. Installation selon la revendication 9, caractérisée en ce que le récipient tampon est obturable de façon étanche à l'air et vidable par utilisation d'air comprimé.
EP91106544A 1990-04-30 1991-04-23 Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur Expired - Lifetime EP0455111B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013941A DE4013941A1 (de) 1990-04-30 1990-04-30 Anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
DE4013941 1990-04-30

Publications (2)

Publication Number Publication Date
EP0455111A1 EP0455111A1 (fr) 1991-11-06
EP0455111B1 true EP0455111B1 (fr) 1994-09-07

Family

ID=6405491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106544A Expired - Lifetime EP0455111B1 (fr) 1990-04-30 1991-04-23 Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur

Country Status (2)

Country Link
EP (1) EP0455111B1 (fr)
DE (2) DE4013941A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2282085A (en) * 1993-08-18 1995-03-29 John Stephen Griffiths Paint supply apparatus
DE19610588B4 (de) * 1996-03-18 2010-08-05 Dürr Systems GmbH Beschichtungsmaschine mit auswechselbarem Behälter
DE19610589A1 (de) * 1996-03-18 1997-09-25 Duerr Gmbh & Co Verfahren und System zur Farbversorgung einer Beschichtungsanlage
DE19632326C1 (de) * 1996-08-10 1998-01-15 Herberts Gmbh Vorrichtung und Verfahren zur Serienlackierung von Kraftfahrzeugkarossen
DE19704829A1 (de) * 1997-02-08 1998-08-20 Herberts Gmbh Vorrichtung und Verfahren zur Lackierung
ES2181025T3 (es) 1996-08-10 2003-02-16 Du Pont Metodo y dispositivo para linea de pintura.
DE19632325A1 (de) * 1996-08-10 1998-02-12 Herberts Gmbh Vorrichtung zur Lackierung von Kraftfahrzeugkarossen
DE19756488A1 (de) 1997-12-18 1999-07-01 Lactec Gmbh Verfahren und Vorrichtung zum Isolieren eines elektrisch leitenden Strömungsmediums
DE10064065B4 (de) * 1999-12-22 2006-07-27 Dürr Systems GmbH Beschichtungssystem für die automatisierte Beschichtungstechnik
DE10010175B4 (de) * 2000-03-02 2016-09-29 Dürr Systems GmbH Beschichtungsstoff-Wechselsystem und Beschichtungssystem für die automatisierte Beschichtungstechnik sowie Verfahren zum automatisierten Beschichten
DE10120077B4 (de) * 2001-04-24 2006-07-27 Dürr Systems GmbH Beschichtungssystem für die automatisierte Beschichtungstechnik

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122320A (en) * 1958-03-20 1964-02-25 Ford Motor Co Method for filling electrically charged receptacle
US3892357A (en) * 1974-04-30 1975-07-01 Nordson Corp Electrostatic spray apparatus and method
US4085892A (en) * 1976-04-21 1978-04-25 Dalton Robert E Continuously energized electrostatic coating voltage block
NL187613C (nl) * 1978-01-11 1991-12-02 Akzo Nv Inrichting voor het elektrostatisch verspuiten van elektrisch geleidende lak.
US4232055A (en) * 1979-04-24 1980-11-04 Champion Spark Plug Company Automatic color change electrostatic paint spray system
DE3440381A1 (de) * 1984-11-05 1986-05-07 Ransburg Gmbh, 6056 Heusenstamm Verfahren und vorrichtung zum automatischen elektrostatischen spruehbeschichten
DE3717929A1 (de) * 1987-05-27 1988-12-08 Behr Industrieanlagen Verfahren und anlage zum elektrostatischen beschichten mit leitfaehigem material
DE3831785A1 (de) * 1988-09-19 1990-03-29 Lenhardt Maschinenbau Verfahren und vorrichtung zum nachfuellen einer hochviskosen, pastoesen substanz in einen speicher einer vorrichtung zum auftragen dieser substanz auf werkstuecke

Also Published As

Publication number Publication date
DE59102796D1 (de) 1994-10-13
DE4013941A1 (de) 1991-10-31
EP0455111A1 (fr) 1991-11-06

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