EP0455109A2 - Procédé et installation de revêtement en series de pièces avec un produit de revêtement conducteur - Google Patents

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

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Publication number
EP0455109A2
EP0455109A2 EP91106542A EP91106542A EP0455109A2 EP 0455109 A2 EP0455109 A2 EP 0455109A2 EP 91106542 A EP91106542 A EP 91106542A EP 91106542 A EP91106542 A EP 91106542A EP 0455109 A2 EP0455109 A2 EP 0455109A2
Authority
EP
European Patent Office
Prior art keywords
container
intermediate container
supply system
chambers
opening
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
EP91106542A
Other languages
German (de)
English (en)
Other versions
EP0455109B1 (fr
EP0455109A3 (en
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
Behr Industrieanlagen GmbH and Co KG
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, Behr Industrieanlagen GmbH and Co KG filed Critical Duerr GmbH
Publication of EP0455109A2 publication Critical patent/EP0455109A2/fr
Publication of EP0455109A3 publication Critical patent/EP0455109A3/de
Application granted granted Critical
Publication of EP0455109B1 publication Critical patent/EP0455109B1/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
    • 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
    • B05B12/1463—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 separate containers for different materials to be sprayed being moved from a first location, e.g. a filling station, where they are fluidically disconnected from the spraying apparatus, to a second location, generally close to the spraying apparatus, where they are fluidically connected to the latter
    • 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
    • B05B5/1633—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 the arrangement comprising several supply lines arranged in parallel, each comprising such an intermediate container

Definitions

  • the invention relates to a method and a system according to the preamble of claims 1 and 6, respectively.
  • 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 with 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 also the danger of explosive discharges would exist 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 spray device at high voltage potential feeds.
  • the connecting line is flushed with a given color and before changing to another color with solvent (water) and dried with compressed air in order to maintain the required insulation for the container which is 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-OS 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 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 of the system known from DE-PS 29 00 660 and the supply system or the second container are so large that no flashover occurs, namely in the known case there is the possibility of a charge exchange by ionization in the Insulation section. This possibility is prevented by the insulating walls of the intermediate container of the system described here.
  • the system mainly consists of a permanently grounded supply system, of which only one outlet pipe 1 is shown, a spray device 2 which is constantly at high voltage and two intermediate container chambers A and B which are combined to form a rotatable structural unit and which are arranged in an electrically insulating manner between the supply system and the spray device.
  • the grounded outlet pipe 1 can e.g. be connected to a pressure-controlled ring line or the like.
  • the two intermediate container chambers A and B essentially consist of elongated cylinders with a semicircular cross-section, which, with their straight base walls 4, 4 ', lie against one another, e.g. are attached to each other by screwing the outer flanges.
  • the arcuate walls 3, 3 'and the base walls 4, 4' of the containers consist of insulating material which is sufficiently thick for insulation and are designed to be pressure-resistant, since the containers should be emptied by compressed air, as will be explained.
  • the elongated cylinders forming the intermediate container chambers A, B are divided by transverse walls into a number of individual chambers (not shown) corresponding to the number of selectable coating materials of different colors, each of which has an opening 5 or 5 'at the apex of the arcuate wall 3, 3'. Except for the openings 5,5 ', in which there are valves or other closure means, the cylinders and their individual chambers are completely closed.
  • the structural unit consisting of the two intermediate container chambers A, B is rotatably mounted about a common axis running in the cylinder longitudinal direction through the center of the outer sides of the base walls 4, 4 '.
  • the axis of rotation is horizontal.
  • a conduit 9 or 9' extends into the container and opens in the vicinity of the part of the base wall 4,4 'opposite the opening 5.5'.
  • the conduit 9.9 ' is part of a, preferably non-conductive, pipe structure 11 or 11' which is seated in the opening 5.5 'and has two valves and which has a second, additional opening in the interior of the container near the opening 5.5' 10.10 '.
  • the mouth at the end of the tube 9,9 'and the opening 10 and 10' are each connected to their own separate connections, which serve as an inlet or outlet depending on the position of the container.
  • the air line 15 serves to vent the intermediate container chamber (A) connected to the supply system during filling, while the air line 16 supplies compressed air with regulated pressure for emptying the intermediate container chamber (B) connected to the line 7 of the spraying device 2.
  • the valve arrangement 13 or 13 ' can be coupled to the valves of the tubular construction 11, 11'.
  • the Opening 10, 10 ' is the mouth of a short second tube; both tubes are each connected to one of the valves of construction 11 or 11 ', which change their position with respect to the connections of the connection arrangements 13, 13' when they are rotated.
  • connection points that is to say the valves of the construction 11, 11 ', should be arranged generally and independently of the shape of the intermediate container chambers A, B at the point of the container wall which is furthest from the axis of rotation. This enables the smallest possible intermediate container arrangement with regard to the required insulation distances.
  • the connecting devices 6, 6 ' also contain, in accordance with the arrows shown, against the container opening 5, 5' and from them along displaceable connecting parts along an axis perpendicular to the rotational axis.
  • the connecting part of the connecting device 6 is connected via the valve arrangement 13 to the outlet pipe 1 and the air line 15, that of the connecting device 6 'to the air line 16 and the line 7 leading to the spray device 2.
  • the displaceable connecting parts of the connecting devices 6, 6 'could be firmly connected to the conduits 9, 9', so that these are pulled out of the openings 5,5 'before the twisting of the intermediate container chambers A, B and then into the opening 5 or 5' of the each other chamber could be retracted.
  • the openings 5 and 5 ' can be closed automatically by appropriate means.
  • the displaceable connecting parts are preferably detached from pipe constructions 11, 11 'remaining in the intermediate container chamber A, B and then coupled again to the other pipe construction.
  • the intermediate container chambers A and B are in the position shown. In this position, coating material can flow from the earthed outlet pipe 1 through the valve arrangement 13 of the connecting device 6 and the mouth at the end of the conduit 9 into the intermediate container chamber A. Since the conduit 9 always opens below the liquid level near the bottom of the container, splashing and blistering of the coating material in the intermediate container are largely avoided. The air displaced by the coating material escapes through the opening 10 which is always above the liquid level during the filling process and through the valve arrangement 13 into the ventilation line 15. At the same time, coating material contained in the lower intermediate container chamber B can pass through the additional opening located at the lower end of the chamber B.
  • the assembly consisting of the intermediate container chambers A and B can be rotated through 180 ° without time problems.
  • the previously filled intermediate container A is located at the bottom of the connection of the spraying device, while the previously emptied intermediate container chamber B is located at the top of the connecting pipe 1 of the supply system.
  • the intermediate container chamber B can now be filled and the intermediate container chamber A can be emptied to the spraying device, which is done in the manner described above.
  • the now upward-pointing mouth at the end of the conduit 9 thus brings compressed air into the intermediate container chamber A, which is emptied through the opening 10, while coating material flows through the opening at the end of the conduit 9 'into the intermediate container chamber B, which flows through the opening 10 'is vented.
  • the contents of the intermediate container chambers A, B are grounded during the filling and before and during the emptying to the high voltage potential of the spraying device.
  • the electrical charge remaining in the intermediate container after emptying can be removed before the subsequent coupling to the grounded supply system, for example by means of leakage resistors.
  • a buffer container 18 is connected to the line 7 leading to the spraying device 2 and is filled by the respective lower intermediate container chamber B and can supply the spraying device 2 during the emptying pauses when the intermediate containers are rotated.
  • the buffer container 18 can by the intermediate container or its own compressed air line 19 are pressurized and thereby emptied. Since this development of the invention does not depend on breaks in operation, there is also the possibility of using a single common intermediate container arrangement (per color) for all connected atomizers, that is to say, for example, for all “levels” of several atomizers in a spray booth.
  • the intermediate containers can be rotated continuously and periodically during these breaks or pivoted about their axis of rotation. Furthermore, during breaks in operation, it is possible to periodically control the internal pressure in the chambers A, B (line 16) and the pressure of the buffer tank 18 (line 19) mentioned so that the liquid in the line 7 is constantly acted upon in opposite directions . This means that achieves a constant viscosity of the material and prevents settling.
  • the system described above can be modified in such a way that the intermediate container arrangement with its two chambers A, B is arranged to be immovable, and the connections of the supply system and the coating device, for example the external connecting devices 6, 6 'with their valves 13, 13', are periodically changed the intermediate container arrangement A, B can be moved, in particular can be rotated about its axis.
  • the method would then be characterized in that the said connections are rotated from a first position, in which the one intermediate container chamber A is filled by the supply system and its contents are electrically insulated from the spray device, into a second position, in which the content of this chamber A is isolated from the supply system and emptied to the spray device.
  • the other features of the system described can be retained here.
  • the valve arrangements 13 and 13 ' each containing two changeover valves for the purposes explained above, can be moved along the illustrated double arrows against the container openings 5 and 5' and away from them. This can be useful for coupling and uncoupling, but is also advantageous in terms of electrical insulation.
  • the valve arrangement 13, 13' can be pushed as far away from the adjacent intermediate container chamber A or B that its distance from the outside of the container is larger than the electrical flashover of the high voltage applied in air. This avoids the risk of short-circuits due to condensation which can form on the outside of the container, particularly in the case of pressurizable containers.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
  • Physical Vapour Deposition (AREA)
  • Coating Apparatus (AREA)
EP91106542A 1990-04-30 1991-04-23 Procédé et installation de revêtement en series de pièces avec un produit de revêtement conducteur Expired - Lifetime EP0455109B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013938A DE4013938A1 (de) 1990-04-30 1990-04-30 Verfahren und anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
DE4013938 1990-04-30

Publications (3)

Publication Number Publication Date
EP0455109A2 true EP0455109A2 (fr) 1991-11-06
EP0455109A3 EP0455109A3 (en) 1992-01-02
EP0455109B1 EP0455109B1 (fr) 1994-09-07

Family

ID=6405488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106542A Expired - Lifetime EP0455109B1 (fr) 1990-04-30 1991-04-23 Procédé et installation de revêtement en series de pièces avec un produit de revêtement conducteur

Country Status (5)

Country Link
EP (1) EP0455109B1 (fr)
JP (1) JPH0788407A (fr)
KR (1) KR910018084A (fr)
DE (2) DE4013938A1 (fr)
ES (1) ES2063395T3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0593238A1 (fr) * 1992-10-15 1994-04-20 Nordson Corporation Dispositif et procédé pour délivrer des matériaux de revêtement conducteurs
US5549755A (en) * 1994-12-08 1996-08-27 Nordson Corporation Apparatus for supplying conductive coating materials including transfer units having a combined shuttle and pumping device
EP0754498A2 (fr) * 1995-07-17 1997-01-22 ABBPATENT GmbH Dispositif pour déposer des substances solides ou liquides sur des surfaces
EP0792695A2 (fr) * 1996-02-29 1997-09-03 Trinity Industrial Corporation Machine de revêtement électrostatique
EP1010469A2 (fr) 1998-12-17 2000-06-21 Dürr Systems GmbH Système et procédé d'alimentation en peinture d'une installation de revêtement électrostatique
EP1027936A1 (fr) * 1999-02-12 2000-08-16 Société Autonome de Verreries SAVERGLASS Installation pour l'application par pulverisation de peintures ou vernis hydrosulubles
US6422491B1 (en) 1997-12-18 2002-07-23 Lactec Gmbh Gesellschaft Fuer Moderne Lackiertechnik Method and device for isolating an electro-conductive flowing medium

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7296756B2 (en) 2005-05-23 2007-11-20 Illinois Tool Works Inc. Voltage block
DE102011119966B3 (de) 2011-12-02 2012-11-22 Khs Gmbh Vorrichtung zur Bildung von Verpackungseinheiten

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2414371A1 (fr) * 1978-01-11 1979-08-10 Akzo Nv Procede et appareil pour la pulverisation electrostatique de peinture electriquement conductrice
EP0274322A1 (fr) * 1987-01-02 1988-07-13 Sames S.A. Installation de projection de produit de revêtement tel que par exemple une peinture et notamment installation de projection électrostatique de peinture à base d'eau

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085892A (en) * 1976-04-21 1978-04-25 Dalton Robert E Continuously energized electrostatic coating voltage block
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
US4932589A (en) * 1988-09-30 1990-06-12 Binks Manufacturing Company Method of and apparatus for electrical isolation of electrostatic sprayers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2414371A1 (fr) * 1978-01-11 1979-08-10 Akzo Nv Procede et appareil pour la pulverisation electrostatique de peinture electriquement conductrice
EP0274322A1 (fr) * 1987-01-02 1988-07-13 Sames S.A. Installation de projection de produit de revêtement tel que par exemple une peinture et notamment installation de projection électrostatique de peinture à base d'eau

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0593238A1 (fr) * 1992-10-15 1994-04-20 Nordson Corporation Dispositif et procédé pour délivrer des matériaux de revêtement conducteurs
US5549755A (en) * 1994-12-08 1996-08-27 Nordson Corporation Apparatus for supplying conductive coating materials including transfer units having a combined shuttle and pumping device
US5759277A (en) * 1994-12-08 1998-06-02 Nordson Corporation Manual and automatic apparatus for supplying conductive coating materials including transfer units having a combined shuttle and pumping device
EP0754498A2 (fr) * 1995-07-17 1997-01-22 ABBPATENT GmbH Dispositif pour déposer des substances solides ou liquides sur des surfaces
EP0754498A3 (fr) * 1995-07-17 1998-04-08 ABBPATENT GmbH Dispositif pour déposer des substances solides ou liquides sur des surfaces
EP0792695A2 (fr) * 1996-02-29 1997-09-03 Trinity Industrial Corporation Machine de revêtement électrostatique
EP0792695A3 (fr) * 1996-02-29 1998-05-27 Trinity Industrial Corporation Machine de revêtement électrostatique
US6422491B1 (en) 1997-12-18 2002-07-23 Lactec Gmbh Gesellschaft Fuer Moderne Lackiertechnik Method and device for isolating an electro-conductive flowing medium
EP1010469A2 (fr) 1998-12-17 2000-06-21 Dürr Systems GmbH Système et procédé d'alimentation en peinture d'une installation de revêtement électrostatique
EP1027936A1 (fr) * 1999-02-12 2000-08-16 Société Autonome de Verreries SAVERGLASS Installation pour l'application par pulverisation de peintures ou vernis hydrosulubles
FR2789606A1 (fr) * 1999-02-12 2000-08-18 Saverglass Societe Autonome De Installation pour l'application par pulverisation de peintures ou vernis hydrosolubles

Also Published As

Publication number Publication date
DE59102794D1 (de) 1994-10-13
KR910018084A (ko) 1991-11-30
JPH0788407A (ja) 1995-04-04
DE4013938A1 (de) 1991-10-31
EP0455109B1 (fr) 1994-09-07
ES2063395T3 (es) 1995-01-01
EP0455109A3 (en) 1992-01-02

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