EP0455106B1 - Procédé et installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur - Google Patents

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

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Publication number
EP0455106B1
EP0455106B1 EP91106533A EP91106533A EP0455106B1 EP 0455106 B1 EP0455106 B1 EP 0455106B1 EP 91106533 A EP91106533 A EP 91106533A EP 91106533 A EP91106533 A EP 91106533A EP 0455106 B1 EP0455106 B1 EP 0455106B1
Authority
EP
European Patent Office
Prior art keywords
container
installation
containers
coating material
intermediate container
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
EP91106533A
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German (de)
English (en)
Other versions
EP0455106A1 (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
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Publication date
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Publication of EP0455106A1 publication Critical patent/EP0455106A1/fr
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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
    • B05B5/1641—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 an additional container being provided downstream the intermediate container

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 intermediate containers are open at their top, that is, they are depressurized. This makes it one of the things required to convey the coating material to the spray device by means of suitable pumps, which can be, for example, a larger number of atomizers distributed along a spray booth.
  • the object of the invention is to create a system which makes it possible to remove the coating material from both intermediate containers without their own pumps or other mechanical conveying means.
  • the invention can also improve and simplify the filling and emptying of both intermediate containers. Furthermore, the invention is suitable for a compact arrangement of the intermediate containers with little construction effort even with a large number of intermediate containers of the type described here for different, selectable coating materials of different colors. It is important, moreover, that the high voltage does not have to be switched off during the coating operation, since the spray device is always isolated from the supply system during operation, either between the two intermediate containers or between the contents of the first intermediate container and the outlet of the supply system.
  • FIG. 1 two intermediate containers A and B can be seen, which between a e.g. consisting of conventional ring lines, permanently grounded supply system, of which only one outlet line 1 is shown with a color pressure regulator 2, and a spray device (not shown) is connected, which is constantly at high voltage.
  • a e.g. consisting of conventional ring lines, permanently grounded supply system of which only one outlet line 1 is shown with a color pressure regulator 2, and a spray device (not shown) is connected, which is constantly at high voltage.
  • the intermediate containers A and B each consist of elongated, piston-like vessels made of pressure-resistant insulating material, which are completely closed except for closable inlets and outlets for the coating material and air.
  • the two intermediate containers A and B are arranged vertically one above the other in a shell 4 of insulating material that completely encloses the containers.
  • the first intermediate container A has an inlet which is formed from a block-like valve 6 connected to the earthed line 1.
  • the valve block bundles the conductive coating material supplied by the supply system with a pressure of, for example, 6.105 Pa (6 bar) to a jet which is directed downwards along the container axis against a liquid guiding device 8.
  • the guide device 8 ensures that the coating material gets into the container with little splashing and as free of bubbles as possible, and can be formed, for example, from surfaces inclined at an angle to the container axis. It can be close to the maximum fluid level.
  • the liquid level in the intermediate container A is monitored by sensors 10 of a known type, which are connected to a control device (not shown), for example for the valve 6, and stop the material supply when a maximum permissible level has been reached.
  • sensors 10 of a known type, which are connected to a control device (not shown), for example for the valve 6, and stop the material supply when a maximum permissible level has been reached.
  • a control device for example for the valve 6, and stop the material supply when a maximum permissible level has been reached.
  • light guides, initiators, pressure sensors, etc. can be arranged on the container wall.
  • the maximum level must not be exceeded in order to guarantee a distance between the conductive liquid in the container and the upper end of the container that is always sufficiently larger than the flashover distance of the high voltage applied.
  • the distance can be approximately 35 cm.
  • the bottom of the intermediate container can lower like a funnel or also obliquely on one side to a deepest point at which the intermediate container A has a valve 12 serving as an outlet valve of this container.
  • the valve 12 also serves as an inlet valve of the lower intermediate container B, which is similar to the container A and has an outlet 14 at its lower, also, for example, funnel-like or sloping end, to which a conventional cabin ring line or other line 15 is connected.
  • the line 15 leads via a color changer to the spraying device (not shown).
  • the valve 12 also directs the liquid focused beam on a guide device 8 '.
  • the maximum liquid level is monitored by a sensor 10 '. Another sensor 11 responds when the liquid level falls below a certain level.
  • pressure lines are connected to both tanks A, B, by means of which a regulated pressure is generated in the tanks at a level sufficient for emptying above ambient or atmospheric pressure.
  • This excess pressure may be somewhat lower than the pressure in outlet line 1 of the Supply system and preferably be generated with dried compressed air. Due to the pressure in the intermediate container A, this can be emptied into the lower container B after opening the valve 12, a somewhat higher pressure being continuously or temporarily set in the container A than in the lower container B. Due to the excess pressure in the container B, the coating material can conveying pumps downstream of the container outlet are conveyed in the direction of the spraying device.
  • the operation of the system described largely corresponds to the method known from the aforementioned DE-C-29 00 660.
  • the upper intermediate container A is filled by the supply system when the valve 12 is closed, it also being at ground potential.
  • the content of the lower container B which is always at the high-voltage potential of the coating device to which it is connected by the conductive material in the line 15, is the upper one Container A is isolated by the air gap of container B.
  • the valve 6 is closed, the content of the container A is placed at the high-voltage potential of the coating device and then the valve 12 is opened, so that the lower container B is now filled.
  • the container A is grounded again.
  • FIG. 2 differs from that according to FIG. 1 essentially only in that the two intermediate containers A, B stand side by side with vertical longitudinal axes, which has the advantage of a relatively small overall arrangement.
  • Compact units are desirable in view of the fact that an arrangement with two intermediate containers A and B of the type described here is generally required for each of the often numerous selectable coating materials of different colors.
  • the coating material passes from the outlet 20 of the first intermediate container A via a riser 21 to an inlet valve 22 at the upper end of the intermediate container B.
  • the intermediate containers A and B are in a common or in an outer shell of insulating material, which is preferably also includes the inlet valves of the containers.
  • FIG. 3 largely corresponds to that according to FIG. 2.
  • a device is mounted at the upper end of each of the intermediate containers A and B, with which an inlet pipe 24 or 24 ′, which is displaceable longitudinally or parallel to the vertical container axis, into the Container can be driven.
  • the tube 24, 24 ' is connected via a fluid coupling to the outlet line 1 of the supply system or to the riser 21 and is used to fill the Container moved from the illustrated retracted position down to a position in which its mouth is near the bottom of the container.
  • This embodiment enables a laminar, bubble-free introduction of the liquid.
  • the tube is then pulled out of the interior of the container.
  • a telescopic tube construction could also be provided, in which the displaceable tube is mounted in a tube which is fixedly mounted in the container inlet.
  • the underside of the movement device 26, 26 ′ can be designed at least approximately in accordance with the shape of the container bottom that sinks in a funnel-like manner.
  • the line 15 leading from the outlet of the intermediate container B to a color changer can be designed as a branch line which ends at a membrane 28 which is acted upon by compressed air pulses.
  • the pressure is higher than the internal pressure of the intermediate container B.
  • the cyclical change between filling and emptying the intermediate containers of the system described is independent of the respective operating state of the coating device and not dependent on coating breaks. This also gives the possibility of a single common intermediate container arrangement (per color) for all connected atomizers, for example for all "levels" of several atomizers in a spray booth.
  • the intermediate containers A, B of the described exemplary embodiments each have closable inlets and outlets for air (not shown).
  • the compressed air required for emptying is applied to the containers through the air inlets. Since there is a risk in certain cases that moisture contained in the compressed air or caused by evaporation of the liquid in the container condenses as condensate on the inner wall of the container, which is made of insulating material, and thereby leads to a short circuit between the liquid content, which may be at high voltage, and the can lead to grounded inlet valve of the container in question, measures to avoid this moisture precipitation may be necessary.
  • a first possibility for this is to regularly remove the air in the intermediate containers, e.g.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (10)

  1. Installation pour le revêtement électrostatique en série de pièces avec une matière de revêtement électriquement conductrice, comportant un système d'alimentation à basse tension ou à la masse, un premier récipient intermédiaire (A) auquel peut être amenée la matière de revêtement à partir d'une conduite de décharge (1) du système d'alimentation, et dont le contenu est isolé du système d'alimentation lors de l'évacuation, un second récipient intermédiaire (B) isolé du système d'alimentation auquel la matière de revêtement peut être amenée à partir du premier récipient intermédiaire (A) et dont le contenu, est, lors du remplissage du premier récipient intermédiaire (A), isolé de son contenu, une soupape (12, 22) placée entre les deux récipients intermédiaires (A, B), et un dispositif de pulvérisation à haute tension, auquel la matière de revêtement peut amenée à partir du second récipient intermédiaire (B), caractérisé en ce que les deux récipients intermédiaires (A, B) peuvent être fermés de façon étanche à l'air ou à la pression et comportent des parois résistant à la pression qui sont au moins partiellement constituées par une matière isolante.
  2. Installation selon la revendication 1, caractérisée en ce que les deux récipients intermédiaires (A, B) sont des récipients isolants en forme de ballon qui comportent à leur extrémité supérieure une entrée reliée à une soupape (6, 12, 22) pour la matière de revêtement et à l'extrémité inférieure une sortie au point le plus bas de leur fond.
  3. Installation selon la revendication 2, caractérisée en ce que les deux récipients intermédiaires (A, B) sont superposés coaxialement dans une enveloppe (4) en matière isolante entourant les deux récipients de toutes parts.
  4. Installation selon la revendication 2, caractérisée en ce que les deux récipients intermédiaires (A, B) sont disposés côte à côte, et en ce qu'à partir de la sortie (20) du premier intermédiaire (A), une conduite ascendante (21) aboutit à la soupape d'admission (22) du second récipient intermédiaire (B).
  5. Installation selon l'une des revendications 2 à 4, caractérisée en ce que l'entrée (soupape (6, 12, 22) des récipients intermédiaires (A, B) introduit dans la matière de revêtement à l'intérieur du récipient sous la forme d'un jet focalisé, et en ce qu'un dispositif de guidage de liquide (8, 8') vers lequel est dirigé le jet focalisé est placé au voisinage du niveau libre de liquide maximum.
  6. Installation selon l'une des revendications 1 à 4, caractérisée en ce qu'elle comporte sur la conduite (1, 21) alimentant le récipient intermédiaire (A, B), à l'extrémité supérieure du récipient, un tube d'admission (24, 24') placé de façon à pouvoir se déplacer suivant l'axe longitudinal du récipient, qui peut être abaissé avec son embouchure pour remplir le récipient (A, B) jusqu'au voisinage du fond du récipient, puis être relevé.
  7. Installation selon l'une des revendications 1 à 6, caractérisée en ce qu'un dispositif (26, 26') pouvant effectuer des mouvements de translation axiale et/ou de rotation, qui déplace la matière de revêtement dans le récipient, pénètre dans le récipient intermédiaire (A, B).
  8. Installation selon les revendications 6 et 7, caractérisée en ce que le dispositif de déplacement (26, 26') peut être élevé et abaissé par le mécanisme de levage du tube d'admission (24, 24').
  9. Installation selon l'une des revendications 2 à 8, caractérisée en ce que la sortie du second récipient intermédiaire (B) aboutit dans une conduite de dérivation (15) à partir de laquelle une ou plusieurs conduites bifurquent vers le dispositif de pulvérisation, et en ce que la conduite de dérivation (15) est fermée à son extrémité opposée au second récipient intermédiaire (B) par une membrane (28) à laquelle peut être appliquée par de l'air pulsé une pression supérieure à la pression interne du second récipient intermédiaire (B).
  10. Installation selon l'une des revendications 1 à 9, caractérisée en ce qu'elle comporte sur une paroi latérale du récipient intermédiaire (A, B) des capteurs (10, 10', 11) pour contrôler le niveau de liquide dans le récipient, qui sont reliés à des dispositifs de commande des soupapes d'admission des récipients.
EP91106533A 1990-04-30 1991-04-23 Procédé et installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur Expired - Lifetime EP0455106B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013940 1990-04-30
DE4013940A DE4013940A1 (de) 1990-04-30 1990-04-30 Verfahren und anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial

Publications (2)

Publication Number Publication Date
EP0455106A1 EP0455106A1 (fr) 1991-11-06
EP0455106B1 true EP0455106B1 (fr) 1994-09-07

Family

ID=6405490

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Application Number Title Priority Date Filing Date
EP91106533A Expired - Lifetime EP0455106B1 (fr) 1990-04-30 1991-04-23 Procédé et installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur

Country Status (3)

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EP (1) EP0455106B1 (fr)
DE (2) DE4013940A1 (fr)
ES (1) ES2027625T1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19715294C1 (de) * 1997-04-11 1998-10-01 Ind Lackieranlagen Schmidt Gmb Lackieranlage und Verfahren zum Betreiben einer Lackieranlage
DE19756488A1 (de) 1997-12-18 1999-07-01 Lactec Gmbh Verfahren und Vorrichtung zum Isolieren eines elektrisch leitenden Strömungsmediums
DE20017630U1 (de) * 1999-12-20 2001-03-22 Tevkür, Talip, 13585 Berlin Farbspritzpistole
US8020784B2 (en) 2005-10-07 2011-09-20 Durr Systems Inc. Coating material supply installation and associated operating procedure
DE202006021283U1 (de) 2005-10-07 2014-10-02 Dürr Systems GmbH Beschichtungsmittel-Versorgungseinrichtung

Family Cites Families (14)

* 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
US3934055A (en) * 1974-04-30 1976-01-20 Nordson Corporation Electrostatic spray 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
DE2937890C2 (de) * 1979-09-19 1981-12-17 Ransburg Gmbh, 6056 Heusenstamm Vorrichtung zur Lackzuführung zu einem elektrostatischen Farbgeber
DE3317650A1 (de) * 1983-05-14 1984-11-15 Basf Ag, 6700 Ludwigshafen Elektrostatisches verspritzen bzw. verspruehen von elektrisch leitfaehigen fluessigkeiten, z. b. pflanzenbehandlungsmitteln
DE3440381A1 (de) * 1984-11-05 1986-05-07 Ransburg Gmbh, 6056 Heusenstamm Verfahren und vorrichtung zum automatischen elektrostatischen spruehbeschichten
SE449451B (sv) * 1986-03-24 1987-05-04 Leif Tilly Sett och anordning att tillfora ett elektriskt ledande, flytande medium fran ett forradssystem till en forbrukningsstation
DE3638307A1 (de) * 1986-11-10 1988-05-19 Volker Ludwig Vorrichtung zum auftragen von fluessigen, pastoesen oder plastischen substanzen auf ein substrat
DE3717929A1 (de) * 1987-05-27 1988-12-08 Behr Industrieanlagen Verfahren und anlage zum elektrostatischen beschichten mit leitfaehigem material
DE3729714A1 (de) * 1987-09-04 1989-03-23 Gema Ransburg Ag Pulveraufbereitungsanlage fuer beschichtungspulver
US4788617A (en) * 1987-11-04 1988-11-29 Davidson Gordon K Liquid transfer apparatus

Also Published As

Publication number Publication date
DE59102792D1 (de) 1994-10-13
ES2027625T1 (es) 1992-06-16
EP0455106A1 (fr) 1991-11-06
DE4013940A1 (de) 1991-10-31

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