EP0455107B1 - Procédé et installation de revêtement en séries de pièces avec un produit de revêtement conducteur - Google Patents

Procédé et installation de revêtement en séries de pièces avec un produit de revêtement conducteur Download PDF

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Publication number
EP0455107B1
EP0455107B1 EP91106534A EP91106534A EP0455107B1 EP 0455107 B1 EP0455107 B1 EP 0455107B1 EP 91106534 A EP91106534 A EP 91106534A EP 91106534 A EP91106534 A EP 91106534A EP 0455107 B1 EP0455107 B1 EP 0455107B1
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EP
European Patent Office
Prior art keywords
intermediate container
supply system
container
opening
insulating shell
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
EP91106534A
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German (de)
English (en)
Other versions
EP0455107A2 (fr
EP0455107A3 (en
Inventor
Rolf Schneider
Kurt Dipl.-Ing. Vetter
Fred Luderer
Michael Baumann
Reinhard Frank
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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Filing date
Publication date
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Publication of EP0455107A2 publication Critical patent/EP0455107A2/fr
Publication of EP0455107A3 publication Critical patent/EP0455107A3/de
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Publication of EP0455107B1 publication Critical patent/EP0455107B1/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
    • 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
    • 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
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet

Definitions

  • the invention relates to a method and a system according to the preamble of claims 1 and 8, respectively.
  • the spray head of rotary atomizers or the like is connected to high voltage, in order to thereby generate the sprayed coating particles on the charging field 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 method and a system that require less space and allow in the case of a large number of selectable coating materials of different colors, the intermediate container required for this can be combined into a compact unit in the smallest of spaces.
  • the spatial distances between the intermediate containers from one another and from the supply system can be substantially reduced by the described insulating means, which in the simplest case consist of a rotatable container.
  • the invention not only has the advantage of taking up little space and requiring little construction, it also enables low operating currents. Even if the insulation distances between the first intermediate container and the supply system or the second container are so large that no flashover occurs, in the known case there is the possibility of a charge exchange by ionization in the insulation zone. This possibility is prevented by the insulating walls of the intermediate containers.
  • 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 first intermediate container and the outlet opening of the supply system. This is achieved according to the invention without the previous need to maintain or set a distance between the intermediate containers and the supply system which is greater than the flashover distance of the high voltage applied.
  • the intermediate containers A and B each consist of an elongated hollow cylinder, the circular cylindrical outer wall 2 or 3 (outer shell) of insulating material of a thickness sufficient for electrical insulation in this embodiment.
  • These cylinders forming the intermediate containers are divided in their longitudinal direction by transverse walls in each case into a number of partial containers corresponding to the number of selectable coating materials of different colors (as is shown in FIG. 4 for another exemplary embodiment).
  • both intermediate containers A and B are immovably mounted.
  • Each sub-container of the intermediate container A has at its upper end an inlet opening 4, for example in the form of a valve, which lies on the longitudinal axis of the outlet pipe 1, and at the lower end an outlet opening 5 likewise in the form of a valve an inlet opening 6, for example in the form of a valve, which lies axially below the outlet opening 5.
  • the entire intermediate container A is concentrically enclosed by a likewise cylindrical insulating shell 7 of sufficiently thick insulating material which is circular in cross section and which can be rotated by at least 180 °, for example by 360 °, about the horizontal longitudinal axis relative to the intermediate container A in accordance with the arrows shown.
  • the insulating shell 7 contains an opening 8 at the positions corresponding to the inlet openings 4 of the various partial containers in the horizontal direction. In the position of the rotatable insulating shell 7 shown, its opening 8 is located exactly between the mouth of the outlet pipe 1 and the inlet opening 4 of the intermediate container A.
  • the second intermediate container B is also concentrically surrounded over its entire length by an insulating shell 9 which, according to the arrows shown, can be rotated in two directions relative to the intermediate container B about its longitudinal axis, for example by 90 °.
  • the insulating shell 9 only has to be partially cylindrical, so that it covers the opening 6 and can be pivoted away from it.
  • the intermediate container B has permanent line connections (not shown) to the spray device.
  • the insulating shells 7, 9 can also be arranged so that they serve as a cover for the openings and prevent loss of solvent and drying of the paint, especially when the inlet and outlet openings of the containers do not contain any valves.
  • the outlet pipe 1 is always at a low or earth potential, while the content of the intermediate container B is constantly connected to the high voltage of the spraying device and the potential of the intermediate container A changes cyclically between high voltage and earth potential.
  • the intermediate container A When the intermediate container A is filled by the supply system, its contents are grounded and isolated from the contents of the intermediate container B. Before and during the intermediate container A is emptied into the intermediate container B, the contents of the intermediate container A, on the other hand, are set to high voltage and isolated from the grounded supply system. While the intermediate container B is then emptied to the spraying device, the intermediate container A can be filled again.
  • the insulation required in each case is not achieved by a spatial distance which is greater than the respective flashover width of the high voltage, but by the insulating material of the container walls and by the insulating shells 7 and 9. This allows the distance between the mouth of the outlet pipe 1 and the liquid in the intermediate container A and the distance between the outlet opening 5 and the liquid in the intermediate container B, between which an electrical flashover distance would otherwise exist, would be smaller than the respective electrical flashover distance.
  • the opening 8 of the insulating shell 7 is located between the outlet pipe 1 and the inlet opening 4, while the insulating shell 7 covers the outlet opening 5 against the inlet opening 6 of the intermediate container B.
  • the insulating shell 9 is located above the inlet opening 6.
  • the intermediate container A Before the intermediate container A is then emptied into the intermediate container B, it is connected to high voltage, and its inlet opening 4 is covered by the insulating shell 7 against the earthed outlet pipe 1, while the opening 8 of the insulating shell 7 now clears the way below the outlet opening 5 ( as indicated by dashed lines in the drawing). At the same time, the insulating shell 9 is turned away from the inlet opening 6 (as is also indicated by dashed lines). These processes are repeated cyclically according to the material consumption.
  • the cyclical switching between filling and emptying the containers is not time-critical.
  • the containers and / or insulating shells can be rotated quickly and easily, even while the coating material is being sprayed, without having to rely on coating breaks. This also results in 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.
  • FIG. 2 differs from that of FIG. 1 only in that the intermediate container A is rotatable and has only one opening 14, which is designed as a valve and serves alternately as an inlet opening and outlet opening, and in that the insulating shell 17 of the intermediate container A is similarly partially cylindrical is like the insulating shell 9 of the intermediate container B.
  • the insulating shell 17 is rotated here by 180 ° to the lower end of the intermediate container A, where it lies between the two containers as well as the insulating shell 9.
  • Rotatable intermediate containers have the additional advantage that they can be moved continuously or periodically during operation and also during breaks in operation, in order to prevent paint from settling on the inside of the containers. This eliminates the need to prevent sedimentation, for example by pumping, as was previously the case with comparable systems.
  • the intermediate containers A and B are preferably completely closed insulating cylinders. However, they do not have to be circular-cylindrical as in the previously described exemplary embodiments, but they can also have expedient other cross-sectional shapes.
  • a rotatable intermediate container A is approximately pear-shaped in cross-section, that is higher than wide, the widest part being when the container is filled and the height dimension along the axis of the outlet pipe 1 and an opening 18 which runs as Valve is formed and as in Fig. 2 alternately serves as an inlet and outlet.
  • the cross-sectional shape shown increases the insulation distances without taking up a lot of space.
  • FIGS. 1 and 2 differs from those of FIGS. 1 and 2 in that there are no separately rotatable insulating shells. Instead is just an attached to the intermediate container A, the round bottom surrounding insulating shell 19 is provided. When the intermediate container A is filled, the insulating shell 19 thus covers the inlet opening 6 of the lower intermediate container B, while covering the mouth of the outlet tube 1 when the intermediate container A is emptied.
  • FIG. 4 shows the shape and arrangement of intermediate containers A and B essentially in accordance with FIG. 3 in an oblique representation, the separate insulating shells 19 being omitted for simplification.
  • the separate insulating shells are not always absolutely necessary.
  • containers A and B are elongated cylinders with a circular, pear-shaped or other cross-section, which are horizontally spaced one above the other in a common frame structure below the outlet pipes 1 for the various Colors are stored. Since the intermediate container B is always at high voltage potential, the bearing structure 20 is designed to be insulating.
  • cylindrical individual containers can also be provided for the different colors, which can be arranged vertically parallel to one another and firmly connected to one another.
  • the second intermediate container B for the spraying device can be emptied in a manner known per se, not shown, using gear pumps, paint pressure regulators, piston pumps, etc.
  • the intermediate container is separated by e.g. horizontally lying partition 22 divided into two chambers B1, B2, which are connected by a valve 23.
  • the upper chamber B1 has an inlet opening 26 in the form of a valve
  • the lower chamber B2 has an outlet opening 27 in the form of a valve which is connected to the spray device 29 via a line 28.
  • a compressed air line 30 or 31 with a valve is connected to each of the two chambers.
  • both chambers B1 and B2 can be filled through the inlet opening 26 and the valve 23. It is also possible to fill chamber B1 first and then empty it into chamber B2 using compressed air. The chamber B2 is emptied through the compressed air line 31 when the valve 23 is closed. The supply in the chamber B2 can be continuously supplemented in accordance with the consumption.
  • a return line 32 leading from the line 28 back into the chamber B1 is expediently provided with a valve 33, as a result of which the settling and drying of paint can be avoided.
  • a vent line 34 with a valve 35 is also provided.
  • the second intermediate container can be pressurized, there is also the possibility, during breaks in operation, of the line connected to it and leading to the coating device, e.g. to apply a periodically changing container pressure to the line 28 in FIG. 5 in order to keep the coating material in the line uniformly viscous and to prevent it from settling.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Physical Vapour Deposition (AREA)
  • Coating Apparatus (AREA)

Claims (16)

  1. Procédé de revêtement électrostatique en série de pièces avec une matière de revêtement électriquement conductrice, dans lequel la matière de revêtement parvient d'abord, à partir d'un système d'alimentation à basse tension où à la terre, dans un premier récipient intermédiaire (A) isolé du système d'alimentation, puis parvient du premier récipient intermédiaire (A) dans un second récipient intermédiaire (B) isolé de celui-ci et du système d'alimentation, et enfin est amené du second récipient intermédiaire (B) à un dispositif de pulvérisation à haute tension, le contenu du second récipient intermédiaire (B) étant en liaison électrique permanente avec le dispositif de pulvérisation, le contenu du premier récipient intermédiaire (A) étant, lors de l'évacuation du second récipient intermédiaire (B), mis à la haute tension, mais étant, lors du remplissage par le système d'alimentation, à son potentiel, et le contenu du premier récipient intermédiaire (A) étant isolé électriquement, lors du remplissage du premier récipient intermédiaire (A), vis-à-vis d'une ouverture d'entrée du second récipient intermédiaire (B) et, lors du remplissage du second récipient intermédiaire (B), vis-à-vis d'une ouverture de sortie du système d'alimentation, caractérisé en ce que l'un au moins des récipients intermédiaires (A, B) est rempli par une ouverture (4, 6, 8, 14, 18) ou un évidement d'une enveloppe isolante (2, 7, 9, 17, 19) formant le récipient ou au moins l'entourant en partie, qui est, après le remplissage, déplacée aux fins d'isolation de telle façon qu'une section fermée de l'enveloppe isolante se trouve sur le trajet par lequel la matière de revêtement est amenée.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on fait tourner l'enveloppe isolante (2, 7, etc.) autour d'un axe aux fins d'isolation.
  3. Procédé sel on la revendication 1 ou 2, caractérisé en ce qu'une ouverture (8) d'une enveloppe isolante (7) entourant complètement le premier récipient intermédiaire (A) est, lors du remplissage du premier récipient intermédiaire entre une ouverture d'entrée (4) du premier récipient intermédiaire et l'ouverture de sortie (1) du système d'alimentation et, après la rotation de l'enveloppe isolante (7), entre une ouverture de sortie (5) du premier récipient intermédiaire (A) et une ouverture d'entrée (6) du second récipient intermédiaire (B).
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une ouverture d'entrée (6) du récipient intermédiaire (A, B) est recouverte après son remplissage par une enveloppe isolante (9) du récipient.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on fait tourner au moins le premier récipient intermédiaire (1) aux fins d'isolation.
  6. Procédé selon la revendication 5, caractérisé en ce qu'on fait tourner le récipient intermédiaire (A) de 180°.
  7. Procédé selon l'une des revendications précédentes caractérisé en ce qu'on évacue le second récipient intermédiaire (B) au moyen d'air comprimé.
  8. Installation pour mettre en oeuvre le procédé de revêtement électrostatique en série de pièces avec une matière électriquement conductrice selon l'une des revendications précédentes comportant un système d'alimentation à bas potentiel ou à la masse, un premier récipient intermédiaire (A) disposé de façon à être isolé du système d'alimentation, comportant une ouverture (4, 14, 18) par laquelle la matière de revêtement peut lui être amenée à partir d'une ouverture de sortie (1) du système d'alimentation, un second récipient intermédiaire (B) disposé de façon à être isolé du premier récipient intermédiaire (A) et du système d'alimentation, comportant une ouverture (6) par laquelle la matière de revêtement peut lui être amenée à partir d'une ouverture (5, 14, 18) du premier récipient intermédiaire (A), et un dispositif de pulvérisation (29) mis à haute tension, auquel la matière de revêtement peut être amenée à partir du second récipient intermédiaire (B), caractérisée en ce que la distance géométrique du contenu du premier récipient intermédiaire (A) à l'ouverture de sortie (1) du système d'alimentation et/ou au second récipient intermédiaire (B) est égal à la distance disruptive de la haute tension appliquée ou inférieure à celle-ci et reste inchangée lors du remplissage et de l'évacuation des deux récipients intermédiaires (A, B), et en ce qu'il est prévu au moins une enveloppe isolante (7, 9, 2) formant le récipient ou l'entourant en partie, qui peut être amenée sur le trajet de décharge disruptive entre le premier récipient intermédiaire (A) et l'ouverture de sortie (1) du système d'alimentation et/ou une ouverture d'entrée (6) du second récipient intermédiaire (B).
  9. Installation selon la revendication 8, caractérisée en ce que l'enveloppe isolante est constituée par la paroi (2) du récipient intermédiaire (A).
  10. Installation selon la revendication 8 ou 9, caractérisée en ce qu'on prévoit une enveloppe isolante (7, 9, 17) pouvant être déplacée autour du récipient intermédiaire (A, B).
  11. Installation sel on l'une des revendications 8 à 10, caractérisée en ce que l'enveloppe isolante (7, 9, 17, 2) peut tourner autour d'un axe horizontal.
  12. Installation selon l'une des revendications 8 à 11, caractérisée en ce que le premier et/ou le second récipients intermédiaire (A, B) a (ou ont) une forme cylindrique ou cylindroïde et l'enveloppe isolante (7, 9, 17, 19) une forme au moins partiellement cylindrique.
  13. Installation selon l'une des revendications 8 à 12, caractérisée en ce que l'un au moins des récipients intermédiaires (A) a une section droite de hauteur supérieure à la largeur (figure 3).
  14. Installation selon l'une des revendications 8 à 13, caractérisée en ce que le second récipient intermédiaire (B) est subdivisé par une paroi de séparation (22) qui comprend une soupape de liaison (23) en deux chambres (B1, B2) dont l'une, la chambre (B1) comporte une ouverture d'entrée (26) et l'autre chambre, (B2), comporte une ouverture de sortie (27) reliée au dispositif de pulvérisation (29), et en ce qu'une conduite à air comprimé (30, respectivement 31) est raccordée à chacune des deux chambres (B1, B2).
  15. Installation selon l'une des revendications 8 à 14, pour une pluralité de matières de revêtement de couleurs diverses pouvant être sélectionnées, caractérisée en ce que chaque récipient intermédiaire (A, B) comprend une pluralité de récipients composants formant une unité modulaire, correspondant chacun à une couleur et séparés entre eux par des parois intermédiaires, et en ce que les deux récipients intermédiaires (A, B) sont disposés parallèlement l'un à l'autre et à une rangée d'ouvertures de sortie (1) en nombre correspondant du système d'alimentation.
  16. Installation selon l'une des revendications 8 à 15, caractérisée en ce que l'un ou chacun des deux récipients intermédiaires (A, B) est à l'exception d'ouvertures d'entrée et/ou de sortie (4, 5, 6), un récipient cylindroïde en matière isolante complètement fermé.
EP91106534A 1990-04-30 1991-04-23 Procédé et installation de revêtement en séries de pièces avec un produit de revêtement conducteur Expired - Lifetime EP0455107B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013937A DE4013937A1 (de) 1990-04-30 1990-04-30 Verfahren und anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
DE4013937 1990-04-30

Publications (3)

Publication Number Publication Date
EP0455107A2 EP0455107A2 (fr) 1991-11-06
EP0455107A3 EP0455107A3 (en) 1992-01-02
EP0455107B1 true EP0455107B1 (fr) 1994-09-07

Family

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Application Number Title Priority Date Filing Date
EP91106534A Expired - Lifetime EP0455107B1 (fr) 1990-04-30 1991-04-23 Procédé et installation de revêtement en séries de pièces avec un produit de revêtement conducteur

Country Status (5)

Country Link
EP (1) EP0455107B1 (fr)
JP (1) JPH0788406A (fr)
KR (1) KR910018083A (fr)
DE (2) DE4013937A1 (fr)
ES (1) ES2027619T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858397A1 (de) 1998-12-17 2000-06-21 Duerr Systems Gmbh Verfahren und System zur Farbversorgung einer elektrostatischen Beschichtungsanlage
FR2815554B1 (fr) * 2000-10-19 2002-12-20 Sames Technologies Dispositif et procede d'alimentation de projecteurs et installation de projection equipee d'un tel dispositif

Family Cites Families (11)

* 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
GB884944A (en) * 1959-06-23 1961-12-20 Ford Motor Co Method and apparatus for filling electrically charged receptacles
FR2094305A5 (fr) * 1970-06-16 1972-02-04 Tunzini Sames
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
DE3644536C1 (de) * 1986-12-24 1987-11-19 Basf Lacke & Farben Vorrichtung fuer eine Wasserlackapplikation mit Hochrotationszerstaeubern ueber Direktaufladung oder Kontaktaufladung
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

Also Published As

Publication number Publication date
EP0455107A2 (fr) 1991-11-06
DE4013937A1 (de) 1991-10-31
KR910018083A (ko) 1991-11-30
ES2027619T3 (es) 1995-01-01
DE59102793D1 (de) 1994-10-13
ES2027619T1 (es) 1992-06-16
JPH0788406A (ja) 1995-04-04
EP0455107A3 (en) 1992-01-02

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