EP0487378A1 - Elektrostatische Farbspritzanlage für eine leitfähige Beschichtungsflüssigkeit - Google Patents

Elektrostatische Farbspritzanlage für eine leitfähige Beschichtungsflüssigkeit Download PDF

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Publication number
EP0487378A1
EP0487378A1 EP91403025A EP91403025A EP0487378A1 EP 0487378 A1 EP0487378 A1 EP 0487378A1 EP 91403025 A EP91403025 A EP 91403025A EP 91403025 A EP91403025 A EP 91403025A EP 0487378 A1 EP0487378 A1 EP 0487378A1
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EP
European Patent Office
Prior art keywords
isolator
valves
coating product
upstream
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91403025A
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English (en)
French (fr)
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EP0487378B1 (de
Inventor
Adrien Lacchia
Pierre Chabert
Roger Tholome
Thierry Viguier
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Sames SA
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Sames SA
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    • 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
    • B05B5/1675—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive the supply means comprising a piston, e.g. a piston pump
    • 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
    • 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 an installation for electrostatic projection of a conductive liquid coating product such as in particular a water-based paint or a metallic paint.
  • the invention relates more particularly to such an installation comprising at least one insulator with a movable duct element inserted in the distribution circuit for the coating product to provide the necessary electrical insulation between the parts of the distribution circuit which are brought to potential earth and those which are brought to high voltage during a coating product spraying phase.
  • the improvement which is the subject of the invention makes it possible in particular to improve the operation of such an insulator and to increase its reliability.
  • Installations of the kind mentioned above are known comprising one or more insulators with movable duct elements, to ensure both the interruption of the flow of the coating product and the electrical insulation of the downstream part.
  • the isolator is actuated by a jack and comprises two conduit elements each provided with a shutter valve, one of the duct elements being movable towards the other.
  • the opening of the valves is caused by the command of one of them, which involves that of the other.
  • Such a system is attractive in appearance because the only control of the actuator of a valve makes it possible to operate both.
  • these systems are unreliable when crossed by conductive liquid coating products such as water-based paints.
  • These coating products are aqueous dispersions of organic resin mixed with mineral solid fillers and optionally with metallic pigments.
  • these dispersions are fragile, abrasive and oxidizing, the suspending agent being demineralized water.
  • the suspending agent being demineralized water.
  • the suspension is destroyed, that is to say when the aqueous phase is separated from the less fluid resinous phase, the latter adheres to the walls or to the mechanical elements and is much more difficult to clean.
  • Another type of installation for electrostatic projection of a conductive liquid coating product provides electrical insulation by means of a simple section of insulating conduit, of sufficient length to "hold” the high voltage.
  • This section of pipe is controlled by valves which allow the coating product to be injected into it to fill the auxiliary tank, then rinse aid and compressed air in order to clean the insulating pipe element and to dry it very thoroughly. carefully so that it can play its role as an electrical insulator.
  • Such a system is for example described in French patent application No. 2,572,662. It is delicate to implement and requires excessively long cleaning and above all drying cycles, difficult to master in the automotive industry. where the coating product change operations are frequent and must be accomplished in a very short time determined by the production rate of the objects to be covered.
  • the invention embodies a new concept for rapidly achieving electrical insulation between the two parts of the electrostatic projection installation.
  • the basic idea of the invention consists in using an insulator with a movable element but in providing the arrangements necessary in the installation for cleaning and purging the insulator before each opening operation thereof. It should be noted that cleaning and purging the insulator does not imply its complete drying by a prolonged circulation of compressed air. The reliability of such an insulator with a movable element is thus considerably increased without the time necessary to carry out the connection-disconnection operations being significantly increased.
  • the invention therefore relates to an installation for electrostatic projection of a conductive liquid coating product, comprising a fluid distribution circuit including said conductive coating product, at least one coating product projector supplied by said circuit and connected to a adjustable or interruptible high voltage source, at least one auxiliary coating product tank, isolated, capable of being brought to the high voltage potential, at least one source of rinsing product and at least one source of compressed air, said circuit comprising at least one isolator with mobile element connected between two parts of said distribution circuit, for isolating the high-voltage part of the upstream circuit, characterized in that it comprises an arrangement of valves distributed upstream and downstream of said isolator and connected to said source of product rinsing and said compressed air source to clean and purge said isolator before each opening operation thereof.
  • movable element insulator is meant both an insulator with a movable duct element and a scraper insulator, these two types of insulator being known and described above.
  • valves establishing communications with sources of rinsing product and / or solvent, recovery means allowing the purging, a source of compressed air to perform this purge ...
  • Such valves, controlled, are conventional and benefit from very long experience. They are less expensive and more reliable than the special valves of an insulator with a movable duct element. Such insulators wear out much less quickly because they are never operated in the presence of an abrasive coating product. Some insulators can even be simplified to the extreme and no longer include a shutter valve.
  • the concept of the invention is applicable to installations for electrostatic projection of a conductive liquid coating product. very different. It applies in particular to an installation allowing frequent and rapid changes of coating product and comprising an upstream auxiliary tank brought to earth potential and connected to a coating product changing unit and a downstream auxiliary tank capable of being brought to the potential of high voltage, means including such an insulator being provided between the two tanks for very quickly transferring a quantity of coating product from the upstream tank to the downstream tank.
  • the invention also applies to an installation intended for electrostatic spraying of coating material and capable of operating continuously with the same coating material, for long periods of time.
  • Such an installation comprises an upstream distribution circuit part, permanently brought to ground potential, a downstream distribution circuit part capable of being brought to high voltage potential and comprising an auxiliary tank and an intermediate circuit part , also comprising an auxiliary reservoir between said upstream and downstream circuit parts and capable of being brought sometimes to the earth potential, sometimes to the high voltage potential.
  • These different parts of the distribution circuit are interconnected by insulators of the type with movable conduit element and include the valves necessary for the implementation of the invention.
  • the invention is also suitable for installations in which the distribution circuit comprises two similar branches arranged in parallel and interconnected by valves between at least one source of coating product and the projector (s), each branch comprising an isolated auxiliary tank. , interconnected by valves between an upstream insulator connected to said source of coating product brought to earth potential and a downstream insulator connected to said projector brought to high voltage during projection.
  • FIG. 1 there is shown an installation for electrostatic projection of conductive liquid coating product
  • a coating product changing unit C placed outside a spray booth Z and connected by a conduit X at the bottom of an upstream auxiliary tank R1 forming part of a coating product distribution circuit D.
  • the latter is located in the projection booth Z and also includes a set of valves which will be detailed below, a tank downstream auxiliary R2, insulated, and three insulators I1, I2, I3, which may be of the known type described above or, preferably, in accordance with the assembly shown in FIG. 3.
  • the projector Pr is of the type comprising a spray bowl B driven at high speed by a Tu turbine.
  • the projector B is brought to a high electrical voltage by an adjustable or interruptible voltage generator G.
  • the projector comprises a coating product injector which deposits said coating product on the internal surface of the bowl B so that it is sprayed into fine droplets, under the effect of centrifugal force.
  • This injector is connected to an outlet of the reservoir R2 via a valve V0.
  • the conduit X which supplies the reservoir R1 can have a length of ten meters while the other links defining the distribution circuit located in the cabin do not exceed one or a few tens of centimeters.
  • the coating product change unit C consists of a number of valves connected to respective fluid supply circuits and all opening into a manifold T, grounded for safety reasons .
  • valves P1, P2 are shown here, for different coating products, respectively connected to supply circuits (not shown) of two coating products of different colors, a valve W0 connected to a source of rinsing product W such as water and a valve A0 connected to a source of compressed air A.
  • the tank R1 is of a known type, provided with a piston actuated by air under pressure at the orifice J. Le movement of the piston is controlled by a sensor M1, this arrangement making it possible to know at any time the quantity of coating product in the reservoir R1.
  • the reservoir R2 has the same structure, with an air inlet L and a displacement sensor M2 associated with the piston.
  • the outlet of the tank R1 is equipped with an outlet valve V7 itself connected to a valve V6 connected to Pu purge means.
  • the output of valve V7 is also connected to a valve V8 itself connected to one end of an isolator I1.
  • the other end of the isolator I1 is connected to the bottom of the tank R2 via a valve V3.
  • a second isolator I2 is, on one side, supplied with compressed air under the control of a valve A1 connected to the source A and of rinse aid under the control of a valve W1 connected to the source of rinse aid W
  • the other side of the isolator I2 is connected to the outlet of the reservoir R2, upstream of the valve V0, via a valve V1.
  • This same end of the isolator I2 is connected to the common point of the isolator I2 and of the valve V3 by means of a valve V2.
  • the installation also includes a third isolator I3 connected on one side to the source of compressed air A via a valve A2 and to a source of solvent S via a valve S1 and connected on the other side to means for cleaning the bowl B (not shown) via a valve V5.
  • the solvent in question is a product capable of dissolving residues of coating product. It is more expensive and more aggressive than rinse aid W (which can be water) but it is reserved for cleaning bowl B.
  • FIG. 3 there is shown by way of example, an assembly capable of constituting the set of insulators I1, I2 and I3 since these, as will be seen below, are intended to be operated together.
  • This system is composed of a cylinder 1 provided with a receiving end piece 2 and a guide end piece 3 mounted in leaktight manner, by means of O-rings 4, at the two ends of the cylinder 1 and immobilized in rotation by pins 6 and in translation by circlips 6 a .
  • a piston 7 is slidably mounted inside the cylinder 1, the seal being ensured by another O-ring 4.
  • the piston 7 supports three rigid tubes 8 for transporting fluid (two tubes of this kind are only visible in the drawing ) which can slide in the guide end 3, the seal being provided by seals 9.
  • each assembly consisting of a tube 8 and a cell 10, forms an insulator as defined above.
  • the tubes 8 are held by a flange 14 which is used to control limit switches 15 which make it possible to verify that the operations of connection and disconnection of the insulators have been carried out completely .
  • the three insulators are clean, empty (but not necessarily dry) and open, the opening being controlled by one of the contactors 15.
  • the reservoir R1 is at least but is soiled with a residue of a first coating product (previously delivered under the control of the valve P1 and transferred to the tank R2 which is full) all the valves are closed except the valve V6 and the generator G is not not in use.
  • the installation is therefore ready to paint an object with the first coating product mentioned.
  • We start painting by opening the valve V0 with a flow rate controlled by the sensor M2.
  • the generator G delivers a high voltage which is applied to the projector.
  • the tank R1 and the manifold T are cleaned.
  • valve V7 is opened and a cleaning sequence is carried out which consists in successively and alternately injecting quantities of rinse aid and compressed air by the control of valves W0 and A0.
  • This cleaning sequence is ended by injecting air through the valve A0, so that the conduits are empty of rinse aid. However, it is not necessary to dry them completely.
  • the second coating product is primed in the collector up to the inlet of the reservoir R1. To do this, we close valve A0 and open valve P2. When the second coating product reaches the reservoir R1, the valve V7 is closed.
  • the tank R1 is filled under the control of the sensor M1.
  • the valve P2 is closed.
  • the reservoir R2 When one has finished painting an object with the first coating product, the reservoir R2 is at a minimum, that is to say that it contains only traces of this coating product.
  • the generator G is then stopped and the tank R2 and the injector are cleaned.
  • all the isolators I1, I2, I3 are closed under the control of the other limit switch 15 (FIG. 3).
  • the valves V1, V3 and V8 are opened and a cleaning sequence of the same type as indicated above is implemented by successively controlling the valves A1 and W1, which has the effect of simultaneously cleaning the injector, through V0 and the reservoir R2, the contaminated rinsing product being discharged towards the purging means Pu by passing through the insulator I1.
  • the injector When the injector is clean and empty, we close the valve V0 and continue cleaning the tank R2. Simultaneously, the bowl B is cleaned by carrying out a specific cleaning sequence with solvent and through the isolator I3. To do this, the valve V5 is opened and the valves A2 and S1 are successively controlled. The isolators I1, I2 and I3 are purged by completing the cleaning sequences defined above by sufficient air injections after the last closing of the valves W1 and S1.
  • the entire distribution circuit D is clean and empty except the reservoir R1 which is filled with the desired quantity of the second coating product.
  • This coating product is transferred to the reservoir R2.
  • the valves A1, A2, V1, V5 and V6 are closed and the valve V7 is opened (the valves V3 and V8 being already open).
  • the transfer takes place in a very short time by applying a high air pressure in J.
  • the reservoir R1 is then at a minimum but contains traces of the second coating product, while the reservoir R2 is at the maximum and full of this product.
  • valves V3, V7 are closed and the isolator I1 is cleaned.
  • valves V2 and V6 are opened and a new cleaning and purging sequence is carried out from the valves A1 and W1.
  • all the elements of the distribution circuit downstream of the tank R1 are clean and the valves V2 and V8 are closed.
  • the insulators are only operated when they are clean and purged. However, they do not need to be completely dry since the electrical insulation is obtained by moving the duct elements 8.
  • These insulators can moreover be very simplified (FIG. 3) compared to those which are commonly used and which include end valves placed at their junction. Thanks to the invention, these valves are no longer essential. However, if they are kept to further increase safety, they no longer risk being clogged or worn out prematurely because the insulators are only operated in the absence of the coating product.
  • isolators I2 and I3 which are self-closing end valve insulators.
  • the insulator I3 On the high voltage side, the insulator I3 is connected to the bowl cleaning means through the valve V5 as before, while, on the other side, the insulator is directly connected to the source of solvent S.
  • the valve V2 is directly connected to the outlet of the reservoir R2.
  • the compressed air source A is connected to a valve V9 which is also connected to the outlet of the reservoir R2.
  • the isolator I2 is connected as before to the valve V1 on the high voltage side and is directly connected to the source of rinse aid W, on the other side.
  • the isolators I1, I2 and I3 are open.
  • the isolator I1 is clean and purged.
  • the isolators I2 and I3 are not, but their valves are closed.
  • the tank R1 is at least and soiled with a residue of the first coating product while the tank R2 is at the maximum and full of this same product. All the valves are closed except the valve V6 and the generator G is stopped.
  • the arrival of the second coating product is started in the collector T and in the tank R1, by opening the valve P2, the valves A0 and W0 being closed.
  • the valve V7 is closed.
  • the reservoir R1 begins to fill under the control of the sensor M1.
  • the valve P2 is closed.
  • the R2 tank is at a minimum. We then stop the generator G.
  • valve V0 is closed and the isolators I1, I2, I3 are closed simultaneously.
  • the valves V3, V8 and V9 are opened, which has the effect of removing the excess coating product contained in the reservoir R2.
  • This tank is then cleaned at the same time as the isolator I1 by carrying out a cleaning and purging sequence by controlling the valves V1 and V9. Simultaneously, the bowl B is cleaned by opening the valve V5.
  • the injector is cleaned by closing the valve V3 and opening the valve V0.
  • the reservoir R1 is at a minimum but is soiled with a residue of the second coating product while the reservoir R2 is at the maximum and is filled with this same coating product.
  • the valves V3 and V7 are closed and the isolator I1 is cleaned by opening the valves V2 and V6 and by implementing a new cleaning and purging sequence from the valves V1 and V9.
  • the insulators I1, I2 and I3 are then opened. From this moment, we are again in the initial situation, the second coating product having been substituted for the first.
  • FIG. 4 represents an installation with two auxiliary tanks in series, capable of applying a conductive coating product without interruption for long periods of time.
  • This installation can be provided for a single coating product or for several, delivered by a coating product change unit not shown, placed upstream of the installation.
  • a coating product is introduced into the distribution circuit by a valve V11, to be conveyed to the injector of the projector Pr, via a valve V26.
  • the distribution circuit comprises three parts of the circuit: a part of the upstream circuit 20 permanently brought to ground potential and including the valve V11, a part of downstream circuit 24 brought to the high potential tension when the generator G is in service and comprising a downstream tank R12 and an intermediate circuit part 22, comprising a tank R11 and connected to said upstream circuit part 20 by an upstream isolator I11 and to said downstream circuit part 24 by a downstream isolator I12 .
  • the tanks R11 and R12 are represented as being analogous to the tanks of coating product used in the installations of FIGS. 1 and 2.
  • the isolators I11 and I12 are also of the same nature as those of the installations described previously with or without shutter valve.
  • the upstream circuit part 20 comprises a valve V12 connected to a supply of rinsing product W and a valve V13 connected to purging means Pu, the three valves V11, V12 and V13 are connected to the same end of the isolator I11 .
  • a coating product changing unit similar to that of FIG. 1 can be added to the upstream circuit part 20 and connected to the inlet of the valve V11 .
  • the other end of the insulator I11, on the side of the part of the intermediate circuit 22, is connected to a tank of rinsing product W11, by a valve V15 and to a waste tank W13 by a valve V14. It is also connected to a bottom inlet of the tank R11 by a valve V17. The outlet of the tank R11 is connected to one end of the isolator I12 by a valve V19. The tanks W11 and W13 are also connected to the isolator I12 by valves V18 and V20, respectively.
  • a source of compressed air A is connected to the common point of the valves V14, V15 and V17, by a valve V16.
  • the other end of the isolator I12, on the side of the downstream circuit part 24, is connected to a rinse aid tank W12 by a valve V21, to the source of compressed air A by a valve V22 and to the tank R12 via a V23 valve.
  • the outlet of tank R12 is connected to the tank W12 by a valve V24 and at the source of compressed air A by a valve V25. This output supplies the projector Pr injector as before, under the control of valve V26.
  • a pressure regulator 100 or a positive displacement pump, inserted in the conduit of the injector, allows to control the flow of sprayed product, despite the pressure variations in the tank R12 due to its filling during projection.
  • the rinse aid or waste tanks W11, W12, W13 can be simpler, without a separation piston.
  • Such a reservoir may simply include an inlet-outlet opening for liquid at its lower part and an air inlet-outlet opening at its upper part, the injection of compressed air causing the expulsion of the liquid.
  • the isolator I12 When the tank R12 is almost empty, the isolator I12 is closed, which brings the intermediate circuit part 22 to the high voltage. The valves V19 and V23 are opened, which makes it possible to fill the reservoir R12 with coating product contained in the reservoir R11.
  • the tank W12 being empty, it is filled with rinsing product contained in the tank W11. To do this, the valve V20 is closed and the valve V18 is opened, the valve V21 being already open.
  • valves V20 and V22 are closed. From this moment, the I12 isolator is cleaned and purged. It can therefore be opened, so that the circuit part 22 is again isolated from the high voltage. In this part of the circuit, the tank W13 is full of soiled rinse aid and the tank W11 is empty.
  • the tank R11 must again be filled with coating agent and the tank W11 with rinse aid. For this, we close the isolator I11.
  • the intermediate circuit part 22 is therefore earthed.
  • the valves V12 and V15 are opened so that the tank W11 is filled with rinse aid.
  • valves V12 and V15 are closed and the valves V13 and V16 are opened.
  • the compressed air purges the isolator I11 of the rinsing product which it contains and drives it towards the purging means Pu.
  • the reservoir R11 is again filled with coating product by closing the valves V13 and V16 and then by opening the valves V11 and V17.
  • the insulator I11 is cleaned using the rinse aid contained in the tank W11. To do this, the valve V14 is closed and the valve V15 is opened, the valve V13 already being open.
  • the tank W11 is then filled with rinsing product by closing the valve V13 and opening the valve V12, the valve V15 being already open.
  • valves V12 and V15 are closed.
  • the isolator I11 is purged of the rinsing product which it contains by opening the valves V13 and V16.
  • the isolator I11 is thus purged by compressed air, it can then be opened after having closed the valves V13 and V16. From this moment, the initial state defined above was found without any interruption in the spraying of coating product and by operating the isolators I11 and I12 only when they are clean and purged.
  • the valve V25 makes it possible to control the admission of compressed air downstream of the tank R12 serving to purge the tanks R11 and R12 as well as the isolators I11 and I12 in the purging means, the valve V13 being open, while their cleaning takes place. done either in the same direction with the rinsing product contained in the tanks W11 and W12, or in the opposite direction with ejection by the projector, the valve V12 then being open.
  • the distribution circuit is established between at least one source of coating product, here a unit for changing the coating product C, and the projector Pr (not shown). It comprises, in a manner known per se, two similar branches CA, CB arranged in parallel and interconnected by valves to said unit for changing the coating product and to the injector of said projector connected to a valve V30.
  • Each branch includes an insulated tank RA or RB interconnected by valves between an upstream isolator IA1 or IB1 connected to the coating product change unit C and a downstream isolator IA2 or IB2, connected to the projector Pr.
  • the branch CA comprises a valve VA1 interconnected between the outlet of the manifold T of the coating product change unit and one end of the insulator IA1, a valve VA2 connected between the other end of the insulator IA1 and the inlet of the RA tank, a VA4 valve connected between the RA tank outlet and one end of the isolator IA2 and a VA6 valve connected between the other end of isolator IA2 and valve V30.
  • the isolator IA1 on the side of the reservoir RA is connected by a valve VA5 to a purge isolator IA3 while the outlet of the reservoir RA is connected by a valve VA3 to this same purge isolator, on the same side as the VA5 valve.
  • the other end of the purge isolator IA3 is connected to purge means Pu, to the earth potential.
  • the layout is the same for the CB branch.
  • the outlet of the manifold T is connected by a valve VB1 to the upstream isolator IB1, the other end of which is connected to the reservoir RB by a valve VB2 and to the purge isolator IB3 by a valve VB5.
  • the outlet of the tank RB is connected by a valve VB3 to the same purge isolator and to the downstream isolator IB2 by a valve VB4.
  • the other end of the downstream isolator IB2 is connected to the valve V30 by a valve VB6.
  • a supply of rinse aid W is connected by a valve WN to a cleaning isolator IN while a source of compressed air A is connected by a valve AN to this same cleaning isolator, on the same side as the WN valve.
  • the other end of the isolator IN is connected by a valve VN to the common point of the valves VA6, VB6 and V30.
  • the color changing unit C is identical to that of FIGS. 1 and 2. It includes coating product inlet valves P1, P2, connected to the manifold T and connected to supply circuits for different coating products. , not shown. A valve W0 connected to the source of rinse aid W and a valve A0 connected to the source of compressed air A are also connected to this manifold T. The operation is as follows.
  • the reservoir RA fills with the first coating product by opening the valves P1, VA1, VA2 and VA3, the isolators IA1 and IA3 being closed.
  • the valve VA3 is closed and the tank is filled by displacement of the piston.
  • the valves P1 and VA2 are closed and the valve VA5 is opened.
  • a cleaning and purging sequence of the kind indicated above is then implemented by alternately controlling the valves W0 and A0.
  • the isolators IA1 and IA3 and the collector T are clean and purged, they are opened.
  • the valve VA5 is then closed.
  • the IA2 isolator is then closed.
  • the tank RB is filled with the second coating product by opening the valves P2, VB1, VB2 and VB3 and closing the isolators IB1 and IB3, until the coating product reaches the inlet of the RB tank.
  • the valve VB3 is then closed to fill the tank.
  • the manifold T and the isolators IB1 and IB3 are cleaned and purged in the same manner as indicated with reference to the branch CA.
  • the valves VB1 and VB2 are closed and the isolators IB1 and IB3 are opened so that the branch CB is awaiting use.
  • valve V30 When you have finished covering an object with the first coating product, clean the injector and isolator IA2.
  • the valve V30 is closed, the isolators IN and IA3 are closed and the valve VA3 is opened.
  • a cleaning sequence is then carried out by alternately controlling the valves AN and WN. This cleaning is ended by purging the insulators IA2 and IA3, by injecting air through the valve AN.
  • the valve VA6 is then closed and the valve V30 is briefly opened to clean the injector and closed again.
  • the valves WN, AN, VN and VA4 are then closed and the isolator IN and the isolator IA2 are opened. It remains to clean the RA tank.
  • the tank RA is cleaned by closing the isolator IA1 and by opening the valves VA1, VA2 and a cleaning cycle is carried out by alternately controlling the valves W0 and A0.
  • valves A0 and W0 are closed and the RA tank is filled with the first coating product by opening the valve P1, or with another product if the collector can be supplied by a larger number circulation circuits for different coating products.
  • the circuit CA has therefore returned to the initial state while the second coating product is being applied with the circuit CB.
  • the projector Pr is brought to a high voltage, during projection, by an electric generator, not shown, and it is brought back to the potential of the earth during the changes of product to be projected.

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  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Elimination Of Static Electricity (AREA)
EP91403025A 1990-11-20 1991-11-12 Elektrostatische Farbspritzanlage für eine leitfähige Beschichtungsflüssigkeit Expired - Lifetime EP0487378B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9014446 1990-11-20
FR9014446A FR2669245B1 (fr) 1990-11-20 1990-11-20 Installation de projection electrostatique de produit de revetement liquide conducteur.

Publications (2)

Publication Number Publication Date
EP0487378A1 true EP0487378A1 (de) 1992-05-27
EP0487378B1 EP0487378B1 (de) 1995-05-17

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EP91403025A Expired - Lifetime EP0487378B1 (de) 1990-11-20 1991-11-12 Elektrostatische Farbspritzanlage für eine leitfähige Beschichtungsflüssigkeit

Country Status (7)

Country Link
US (1) US5249748A (de)
EP (1) EP0487378B1 (de)
JP (1) JP3286686B2 (de)
CA (1) CA2055299C (de)
DE (1) DE69109823T2 (de)
ES (1) ES2072574T3 (de)
FR (1) FR2669245B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726880A1 (fr) * 1994-11-01 1996-05-15 Graco Inc Dispositif a isolement de tension pour commander l'isolement d'un liquide conducteur
EP1772194A2 (de) 2005-10-07 2007-04-11 Dürr Systems GmbH Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
US8020784B2 (en) 2005-10-07 2011-09-20 Durr Systems Inc. Coating material supply installation and associated operating procedure

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695327B1 (fr) * 1992-09-09 1995-07-07 Sames Sa Dispositif de projection électrostatique de produit de revêtement électriquement conducteur, muni d'un réservoir isolé adapté à contenir un tel produit.
US5341990A (en) * 1993-06-11 1994-08-30 Nordson Corporation Apparatus and method for dispensing electrically conductive coating material including a pneumatic/mechanical control
JP2801541B2 (ja) * 1993-11-24 1998-09-21 旭サナック株式会社 電圧ブロック装置
US5364035A (en) * 1993-12-20 1994-11-15 Graco Inc. High voltage sealing and isolation via dynamic seals
US5632816A (en) * 1994-07-12 1997-05-27 Ransburg Corporation Voltage block
US5647542A (en) * 1995-01-24 1997-07-15 Binks Manufacturing Company System for electrostatic application of conductive coating liquid
GB2307195B (en) * 1995-11-20 1999-03-10 Honda Motor Co Ltd Method and apparatus for cleaning electrostatic coating apparatus
US5947392A (en) * 1997-09-12 1999-09-07 Noroson Corporation Two-component metering and mixing system for electrically conductive coating material
US6423143B1 (en) 1999-11-02 2002-07-23 Illinois Tool Works Inc. Voltage block monitoring system
US6945483B2 (en) 2000-12-07 2005-09-20 Fanuc Robotics North America, Inc. Electrostatic painting apparatus with paint filling station and method for operating same
US6676049B2 (en) 2001-11-16 2004-01-13 Efc Systems, Inc. Bell cup powder spray applicator
US20030175443A1 (en) * 2002-03-14 2003-09-18 Ghaffar Kazkaz Method and apparatus for dispensing coating materials
US6918551B2 (en) * 2003-07-17 2005-07-19 Illinois Tool Works Inc. Dual purge manifold
US7296756B2 (en) 2005-05-23 2007-11-20 Illinois Tool Works Inc. Voltage block
US7828527B2 (en) 2005-09-13 2010-11-09 Illinois Tool Works Inc. Paint circulating system and method
GB0518637D0 (en) 2005-09-13 2005-10-19 Itw Ltd Back pressure regulator
DE102005048223A1 (de) * 2005-10-07 2007-04-19 Dürr Systems GmbH Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
DE102005060959A1 (de) * 2005-10-07 2007-04-19 Dürr Systems GmbH Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
DE102006041677B4 (de) * 2006-09-06 2019-05-29 Eisenmann Se System zur Reinigung von medienführenden Wegen in einer Beschichtungsanlage
KR100931123B1 (ko) * 2008-04-21 2009-12-10 현대자동차주식회사 실린더 기구를 이용한 수용성 도장 장치

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313475A (en) * 1980-06-26 1982-02-02 The Gyromat Corporation Voltage block system for electrostatic coating with conductive materials
EP0394084A1 (de) * 1989-04-19 1990-10-24 Sames S.A. Elektrostatische Farbspritzanlage für eine leitende Flüssigkeit und Isolierungsvorrichtung für ein Versorgungssystem einer leitenden Flüssigkeit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2654365B1 (fr) * 1989-11-14 1992-02-21 Sames Sa Installation d'application de produit de revetement conducteur, par voie electrostatique.
US5078168A (en) * 1990-07-18 1992-01-07 Nordson Corporation Apparatus for electrostatically isolating conductive coating materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313475A (en) * 1980-06-26 1982-02-02 The Gyromat Corporation Voltage block system for electrostatic coating with conductive materials
US4313475B1 (en) * 1980-06-26 1994-07-12 Nordson Corp Voltage block system for electrostatic coating with conductive materials
EP0394084A1 (de) * 1989-04-19 1990-10-24 Sames S.A. Elektrostatische Farbspritzanlage für eine leitende Flüssigkeit und Isolierungsvorrichtung für ein Versorgungssystem einer leitenden Flüssigkeit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726880A1 (fr) * 1994-11-01 1996-05-15 Graco Inc Dispositif a isolement de tension pour commander l'isolement d'un liquide conducteur
EP1772194A2 (de) 2005-10-07 2007-04-11 Dürr Systems GmbH Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
EP1772194A3 (de) * 2005-10-07 2008-09-17 Dürr Systems GmbH Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
US8020784B2 (en) 2005-10-07 2011-09-20 Durr Systems Inc. Coating material supply installation and associated operating procedure
EP2810719B1 (de) 2005-10-07 2018-06-20 Dürr Systems AG Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren

Also Published As

Publication number Publication date
CA2055299A1 (fr) 1992-05-21
FR2669245A1 (fr) 1992-05-22
DE69109823T2 (de) 1995-11-02
JP3286686B2 (ja) 2002-05-27
EP0487378B1 (de) 1995-05-17
US5249748A (en) 1993-10-05
FR2669245B1 (fr) 1993-02-19
ES2072574T3 (es) 1995-07-16
DE69109823D1 (de) 1995-06-22
CA2055299C (fr) 2002-01-01
JPH04267961A (ja) 1992-09-24

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