EP0455106A1 - 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
EP0455106A1
EP0455106A1 EP91106533A EP91106533A EP0455106A1 EP 0455106 A1 EP0455106 A1 EP 0455106A1 EP 91106533 A EP91106533 A EP 91106533A EP 91106533 A EP91106533 A EP 91106533A EP 0455106 A1 EP0455106 A1 EP 0455106A1
Authority
EP
European Patent Office
Prior art keywords
container
containers
intermediate container
coating material
supply system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91106533A
Other languages
German (de)
English (en)
Other versions
EP0455106B1 (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
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 EP0455106A1 publication Critical patent/EP0455106A1/fr
Application granted granted Critical
Publication of EP0455106B1 publication Critical patent/EP0455106B1/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

Definitions

  • the invention relates to a method and a system according to the preamble of claims 1 and 11, 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 which is at high voltage potential horizontal spray device 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 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 spraying device by means of suitable pumps, which can be, for example, a larger number of atomizers distributed along a spray booth.
  • the invention has for its object to provide a method and a system that make it possible to remove the coating material from two 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 other, 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 tundish 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 container.
  • 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 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 in a funnel-like manner 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 at its lower, also for example funnel-like or sloping end, an outlet 14 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 the ambient or atmospheric pressure.
  • This excess pressure can be somewhat lower than the pressure in the outlet line 1 of the Supply system and preferably be generated with dried compressed air. Due to the pressure in the intermediate container A, it can be emptied into the lower container B after the valve 12 has been opened, it being possible to continuously or temporarily set a somewhat higher pressure 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 corresponds in principle largely to the method known from the aforementioned DE-PS 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 contents of the container A are 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.
  • an axially linearly up and down movable (and / or rotatable about the container axis) device 26, 26 'can dip into the intermediate containers A and B, with which the coating material is kept in motion in the container, which among other things. prevents settling and drying during breaks.
  • the lifting mechanism of the inlet tube 24, 24 'can be used for the up and down movement.
  • the underside of the movement device 26, 26 'can be designed at least approximately in accordance with the shape of the container bottom which sinks in a funnel shape.
  • 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 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 will condense as condensate on the inner wall of the container, which is made of insulating material, and thereby cause 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.

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  • Electrostatic Spraying Apparatus (AREA)
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
DE4013940A DE4013940A1 (de) 1990-04-30 1990-04-30 Verfahren und anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
DE4013940 1990-04-30

Publications (2)

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

Family

ID=6405490

Family Applications (1)

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)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0870547A3 (fr) * 1997-04-11 1999-12-29 INLAC Industrie-Lackieranlagen GmbH Installation de peinture et procédé de fonctionnement
US6422491B1 (en) 1997-12-18 2002-07-23 Lactec Gmbh Gesellschaft Fuer Moderne Lackiertechnik Method and device for isolating an electro-conductive flowing medium
EP1772194A2 (fr) 2005-10-07 2007-04-11 Dürr Systems GmbH Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement
US8020784B2 (en) 2005-10-07 2011-09-20 Durr Systems Inc. Coating material supply installation and associated operating procedure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20017630U1 (de) * 1999-12-20 2001-03-22 Tevkür, Talip, 13585 Berlin Farbspritzpistole

Citations (6)

* 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
US3934055A (en) * 1974-04-30 1976-01-20 Nordson Corporation Electrostatic spray method
DE3014221A1 (de) * 1979-04-24 1980-11-13 Champion Spark Plug Co Verfahren und vorrichtung zum elektrostatischen spritzen
DE2900660C2 (de) * 1978-01-11 1983-08-18 Akzo Gmbh, 5600 Wuppertal Verfahren und Vorrichtung zum elektrostatischen Spritzen von elektrisch leitfähigen Lacken
US4788617A (en) * 1987-11-04 1988-11-29 Davidson Gordon K Liquid transfer apparatus
DE3717929A1 (de) * 1987-05-27 1988-12-08 Behr Industrieanlagen Verfahren und anlage zum elektrostatischen beschichten mit leitfaehigem material

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
DE3729714A1 (de) * 1987-09-04 1989-03-23 Gema Ransburg Ag Pulveraufbereitungsanlage fuer beschichtungspulver

Patent Citations (6)

* 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
US3934055A (en) * 1974-04-30 1976-01-20 Nordson Corporation Electrostatic spray method
DE2900660C2 (de) * 1978-01-11 1983-08-18 Akzo Gmbh, 5600 Wuppertal Verfahren und Vorrichtung zum elektrostatischen Spritzen von elektrisch leitfähigen Lacken
DE3014221A1 (de) * 1979-04-24 1980-11-13 Champion Spark Plug Co Verfahren und vorrichtung zum elektrostatischen spritzen
DE3717929A1 (de) * 1987-05-27 1988-12-08 Behr Industrieanlagen Verfahren und anlage zum elektrostatischen beschichten mit leitfaehigem material
US4788617A (en) * 1987-11-04 1988-11-29 Davidson Gordon K Liquid transfer apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0870547A3 (fr) * 1997-04-11 1999-12-29 INLAC Industrie-Lackieranlagen GmbH Installation de peinture et procédé de fonctionnement
US6422491B1 (en) 1997-12-18 2002-07-23 Lactec Gmbh Gesellschaft Fuer Moderne Lackiertechnik Method and device for isolating an electro-conductive flowing medium
EP1772194A2 (fr) 2005-10-07 2007-04-11 Dürr Systems GmbH Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement
EP1772194A3 (fr) * 2005-10-07 2008-09-17 Dürr Systems GmbH Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement
US8020784B2 (en) 2005-10-07 2011-09-20 Durr Systems Inc. Coating material supply installation and associated operating procedure

Also Published As

Publication number Publication date
ES2027625T1 (es) 1992-06-16
DE4013940A1 (de) 1991-10-31
EP0455106B1 (fr) 1994-09-07
DE59102792D1 (de) 1994-10-13

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