EP0303541A1 - Farbspritzanlage für Beschichtungsprodukte, zum Beispiel für wasserlösliche Farbe - Google Patents

Farbspritzanlage für Beschichtungsprodukte, zum Beispiel für wasserlösliche Farbe Download PDF

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Publication number
EP0303541A1
EP0303541A1 EP88402081A EP88402081A EP0303541A1 EP 0303541 A1 EP0303541 A1 EP 0303541A1 EP 88402081 A EP88402081 A EP 88402081A EP 88402081 A EP88402081 A EP 88402081A EP 0303541 A1 EP0303541 A1 EP 0303541A1
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EP
European Patent Office
Prior art keywords
circuit
product
conduit
installation according
section
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
EP88402081A
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English (en)
French (fr)
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EP0303541B1 (de
Inventor
Eric Prus
Adrien Lacchia
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Sames SA
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Sames SA
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Priority claimed from FR8711577A external-priority patent/FR2619322B1/fr
Priority claimed from FR878713855A external-priority patent/FR2621500B2/fr
Priority claimed from FR888808944A external-priority patent/FR2633532B2/fr
Application filed by Sames SA filed Critical Sames SA
Publication of EP0303541A1 publication Critical patent/EP0303541A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • 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
    • 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
    • B05B5/1633—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 an installation for spraying a coating product, in particular a conductive coating product, such as a water-soluble paint or a metallized paint, applied electrostatically; it relates more particularly to a new arrangement making it possible to rapidly ensure changes to such products.
  • a coating product in particular a conductive coating product, such as a water-soluble paint or a metallized paint, applied electrostatically; it relates more particularly to a new arrangement making it possible to rapidly ensure changes to such products.
  • the invention finds its preferred field of application in the fields where the objects to be covered follow one another along the same projection location and where any two consecutive objects must generally be covered by coating products of different colors. Such operating constraints imposing extremely rapid color change cycles are encountered in particular in the automotive industry for painting bodywork elements.
  • the invention is more particularly intended to solve the additional problems posed in this context by the electrostatic application of water-soluble paints or certain metallized paints, which are relatively conductive.
  • a paint spraying installation in a production unit as large as an automobile manufacturing plant, for example, generally comprises several very long closed-loop paint circulation circuits (these circuits can cross an entire part from the factory) which establish the link between large paint tanks and the different projection booths. It is therefore necessary to provide such a circuit by color and another similar circuit for the solvent or the cleaning product. For obvious safety reasons, these circuits are connected to earth.
  • projection means can be "bowls” rotating at high speed, or pneumatic or hydrostatic spraying.
  • One of the usual problems to solve in this type of installation is that of the color change between two consecutive objects. Indeed, in the automobile industry, in particular, there is no question of painting the bodies in series, according to the color. The most frequent case, on the contrary, is that where the color must practically be changed after each bodywork. This implies being able to implement rinsing and drying cycles of the projection means, which are extremely rapid. For example, a color change can take place every minute or so and the time allowed for carrying out all the operations necessary for the color change is of the order of ten seconds.
  • coating product changing unit or, more simply, “color changing unit”.
  • coloring product changing unit Conventionally, to change color, it is necessary to close the valve of the coating product circuit used, a certain time (calculated) before the end of the spraying phase in progress, then open the compressed air valve to push the remaining product to the projector. A cleaning cycle is then carried out comprising a succession of injections of cleaning product and compressed air until the conduits are clean and dry. Finally, another valve from another coating product circuit is open to fill the manifold. and ducts until a little new color coating comes out of the projector. A new paint projection phase can then begin.
  • the collector When the installation has only a small number of coating products of different colors, for example three or four, the collector can be placed fairly close to the projector. On the other hand, when there are too many different coating products (there can be up to twenty or more) this solution is no longer practicable and the color change unit must then be placed away from the spotlights.
  • the projection means are subject to large displacements parallel to the largest dimension of these objects, in particular in the case of robots, for example five or six meters.
  • the color change unit is very far from the projector (s), which considerably increases the volumes of conduits to be cleaned, and therefore the time of the color change sequences. Therefore, with each change of color, the amounts of coating product and cleaning product lost are significant, of the order of several hundred cubic centimeters.
  • the invention therefore essentially relates to a coating product spraying installation of the type comprising a coating product changing unit, means for supplying rinsing product, at least one distribution circuit, downstream of said unit and supplying at least one projector ensuring the spraying of said product, as well as an intermediate tank, forming part of this distribution circuit, characterized in that said intermediate tank consists of a section of conduit of said distribution circuit and in that that controlled connection means are arranged to push said coating product, in the spraying phase, from said rinsing product.
  • the fact of having transformed the intermediate tank into a conduit has many advantages. -
  • the intermediate tank thanks to its new shape, is much easier to clean, which requires less rinse aid and therefore saves time.
  • Thanks to one or more flow sensors judiciously placed in the installation it is possible to very precisely control the quantity of product injected in each cycle as well as the spraying of this product.
  • At least one insulating conduit is provided between the parts connected to earth and the parts connected to high voltage. It is then possible to maintain an air circulation in such an insulating duct, to complete the drying and to avoid any short-circuit phenomenon attributable in particular to a possible ionization of the humid air in the pipes.
  • the coating product changing unit is earthed, for the reasons stated above. If the installation is suitable for an application of said coating product by electrostatic means, said distribution circuit is then sequentially connected to a high voltage applied to the electrostatic projector.
  • the installation is further characterized in that said controlled connection means are arranged between, on the one hand, said section of conduit and on the other hand, said unit and means for supplying rinse aid. isolated from the earth, so as to be able to push said coating product, in the electrostatic projection phase, from rinsing product coming from these isolated supply means.
  • the usual rinsing product for water-soluble paints is water containing a certain proportion of an alcohol; it is therefore necessary to have a certain volume of rinse aid in an electrically isolable tank from the ground, so that the spotlight (s) are not earthed by the column of paint and rinse aid.
  • the presence of a tank carried periodically at high voltage and which may not find a place in the cabinets where the elements at high voltage of the projector are locked can, in certain cases, become a drawback.
  • the guard pipe will consist of a tube of section as small as possible taking into account the admissible pressure drops, into which the rinsing liquid will be injected following the quantity of coating product required. Due to the small cross-section of the guard line, and the speed of progression of the rinse aid, most of the rinse will be obtained in the front parts of the rinse aid column, and the diffusion of the remains of the rinse aid coating upstream of this column will be minimal; thus, when the flow sensor has signaled that the paint advancement front reaches the headlamp, an insulating column of rinse aid will have formed in the guard pipe, and will limit the bypass of electric current from the headlamp raised to high voltage at an acceptable value, despite the significant conductivity of the coating product in the reservoir section.
  • controlled connection means can be confused with the set of controlled valves of the product change unit, all the circuits which are located upstream of the grounded flow sensor being protected against current shifts from the projector (s).
  • the coating product and the insulating rinse aid can be propelled by a positive displacement pump, preferably geared, immediately upstream of the flow sensor, and here earthed. This propulsion can be ensured by an overpressure of the supplies of coating and rinsing products, in cooperation with a rinsable pressure regulator known per se, disposed between the reservoir section and the projector (s).
  • a purge circuit is mounted as a bypass on the distribution circuit immediately upstream of the projector (s), this purge circuit comprising a valve controlled near the distribution circuit, and an electrical isolation pipe opening into a collector. mass purge.
  • FIG. 1 is a block diagram of a first embodiment of a paint spraying installation according to the invention
  • - Figure 2 is a diagram of a variant of the embodiment of Figure 1
  • - Figure 3 is a block diagram of another embodiment of a paint spraying installation according to the invention and allowing to obtain even shorter color change cycles
  • - Figure 4 is a block diagram similar to that of Figure 1, with improvements aimed at improving the insulation between the parts brought to high voltage and those connected to earth;
  • FIG. 1 is a block diagram of a first embodiment of a paint spraying installation according to the invention
  • - Figure 2 is a diagram of a variant of the embodiment of Figure 1
  • - Figure 3 is a block diagram of another embodiment of a paint spraying installation according to the invention and allowing to obtain even shorter color change cycles
  • - Figure 4 is a block diagram similar to that of Figure 1, with improvements aimed at improving the insulation between the parts brought to high voltage and those connected to earth;
  • FIG. 1 is a block diagram of a first embodiment of a
  • FIG. 5 schematically represents another installation according to the invention, with a coating product propulsion pump
  • Figure 6 is a variant of Figure 5, with a connection circuit between the guard pipe and tank section
  • Figures 7 and 8 correspond to Figures 5 and 6, respectively, with replacement of the pump propulsion by a pressurization propulsion
  • Figure 9 is a development of the installation of Figure 6, with a duplication of the distribution circuits.
  • the painting projection installation shown comprises a color changing unit 11 and a distribution circuit 12 extending between said color changing unit 11 and at least one electrostatic projector 13 fitted with a needle valve 14 controlling the passage of the paint.
  • This projector connected to a high voltage source 13 a adjustable and / or interruptible is placed in a projection booth, not shown, in which transit objects to be painted in different colors.
  • the distribution circuit 12 is therefore supplied by the color changing unit 11 which selects the desired shade.
  • the distribution circuit 12, for its part, supplies a certain amount of paint of the selected shade, predetermined as a function of the size of the object to be painted, to the projector 13.
  • the projector is brought to high voltage; the conventional high voltage source is not shown.
  • the paint used is conductive (water-soluble paint or metallic paint) and the distribution circuit 12 is brought to high voltage at the same time as the projector.
  • the color changing unit 11 comprises a set of selection solenoid valves 11A, making it possible to put its output collector 15 in communication with one of the following circuits: - either one of the paint circulation circuits 16A, 16B, 16C, each circuit 16 corresponding to a given color, - Or a circuit for circulating rinse aid 17; for a water-soluble paint, it is water possibly added with alcohol, - either a compressed air supply circuit 18.
  • the outlet of the collector 15 is connected to the distribution circuit 12 by isolation means comprising a conduit made of insulating material, here called the first isolation conduit 20, a controlled valve 21 and purging means 22.
  • the downstream end of the insulation conduit 20 is connected to the distribution circuit 12 via the valve 21 and to the purge means 22 via a controlled valve 25, via a portion of insulating conduit 24.
  • the installation also includes purge means 26 connected via a valve 27, to the distribution circuit 12 at the downstream end thereof, that is to say in the vicinity of the projector 13.
  • a pressure regulator 29, rinsable, of a known type, is connected to the downstream end of the circuit 12, that is to say as close as possible to the projector 13.
  • a flow sensor 30, which will be described in detail below, is also inserted into circuit 12 near its upstream end.
  • a cleaning unit 35 is connected by a valve 36 to the purge means 26, the connection being made in the vicinity of the valve 27 so as to be able to clean and dry the portion of conduit 28 connecting this valve 27 to the means of the purge 26.
  • the purge means 22 and 26 are connected to the earth.
  • the cleaning unit 35 comprises controlled connection means able to put successively in communication with the valve 36, either the rinsing product circulation circuit 17, or a compressed air distribution circuit 18.
  • the conduit 37 connecting the cleaning unit 35 at valve 36 is made of material insulating, the cleaning unit 35 being earthed.
  • conduits which connect the various constituent elements of the installation, are advantageously made of insulating material.
  • Some of them such as for example the conduit 20 mentioned above, whose specific function is to allow electrical insulation between two important parts of the installation when one of them is brought to high voltage, are more specifically called "insulation conduits".
  • the length of such an insulation pipe is calculated so that it has sufficient resistance to high voltage, once it has been cleaned with rinse aid and dried internally with water. 'pressurized air.
  • An intermediate tank 41 which can be rinsed off, is part of the distribution circuit 12 and, according to an important characteristic of the invention, this intermediate tank consists of a section of conduit of length AB of this distribution circuit 12.
  • this section duct is made of insulating material, and its length is determined according to the volume of paint required to completely cover an object.
  • the circuit 12 is also connected, by means of controlled connection means, on the one hand to the color changing unit 11 and on the other hand, to means for supplying rinse aid 40, isolated of the earth.
  • said controlled connection means comprise the valve 21 already mentioned, and a controlled valve 45, inserted between the upstream end of the circuit 12 and an outlet conduit 42 of a tank 44 containing said rinse aid. This tank 44 is electrically isolated from the ground.
  • the reservoir 44 is connected to a supply and pressurization unit 46 capable of delivering rinsing product coming from a circuit 47 (to complete the level in the reservoir 44) and compressed air coming from a circuit 48.
  • the compressed air serves both to establish the pressure in the tank 44 and to dry the insulating conduit 49 connecting the unit 46 to the tank, after a refreshing phase of the latter.
  • the high voltage is set to zero and the color change unit 11 is controlled to select one of the paints. This flows towards the projector, the valves 21 and 27 being open.
  • the valve corresponding to the paint selected in unit 11 is closed and that of circuit 17 is opened simultaneously. From this moment, the paint is pushed by rinse aid coming from circuit 17.
  • the lengths of conduits are calculated so that, when the paint reaches the projector (point B) the "limit" between the rinse aid and the paint, is located at A, that is to say at a point located downstream of the valve 21 and (preferably) downstream of the flow sensor 30.
  • valve 27 is closed and the valves 25 and 45 are opened. This ensures continuity of the pushing fluid (that is to say the rinsing product) between the pressurized reservoir 44 and the distribution circuit 12. The product rinsing, which then comes from the reservoir 44, is directed for a short time to the purging means 22 through the valve 25.
  • the high voltage is then established and painting begins by opening the valve 45.
  • the flow is constantly monitored and regulated from the flow sensor 30 and the pressure regulator 29, via the computer.
  • the invention therefore makes it possible to clean the distribution circuit 12, the flow sensor 30 and the various valves immediately after the passage of the paint, since the latter is pushed by rinsing product. To this saving of time, there is added that which results from the fact that the shape of the intermediate reservoir 41, that is to say the section of conduit of length AB, is that which is most easily and quickly cleaned.
  • the flow sensor 30 is brought to high voltage during the projection phase; it must therefore be able to develop a signal that can be used despite the presence of this high voltage.
  • a sensor with a mechanical structure similar to that of a gear pump will be used.
  • the sensor is traversed by the liquid which drives rotating gear wheels.
  • These can therefore easily be used to develop a variable frequency signal as a function of the flow rate, thanks to an appropriate transducer placed opposite a toothed wheel.
  • This transducer can for example be of variable reluctance. Isolation can be ensured by a transformation into light pulses and a transfer by optical fiber.
  • FIG. 2 The embodiment of FIG. 2 is very similar to that of FIG. 1.
  • the analogous elements bear the same reference numbers and will not be described again.
  • the sequencing is the same.
  • the pressure regulator 29 is eliminated, while a volumetric pump 50, rinsable, is inserted in the distribution circuit 12, preferably in the vicinity of the flow sensor 30, that is to say near the upstream end of the distribution circuit 12.
  • the flushable pump 50 is a gear pump. Under these conditions, the pressure of the compressed air in the circuit 48 and therefore in the reservoir 44 can be much lower (of the order of a few bars) since it is only used for feeding the pump 50. filling, therefore the color change, is nevertheless faster and the product is not subjected to strong pressure variations. It only “rises” in pressure when it is going to be sprayed.
  • the embodiment of Figure 3 further reduces the time of color change operations.
  • the distribution circuit described with reference to FIG. 1, is replaced by two distribution circuits 12 a , 12 b so as to be able to clean and fill a distribution circuit during the spraying of the paint previously engaged in the other distribution channel.
  • each distribution channel 12, 12b therefore comprises a pipe section forming intermediate tank 41 a, 41 b, rinsable and means for controlled connection are arranged to alternately connect each of these duct sections at the color changing unit 11 and to the means for supplying rinse aid 40, respectively.
  • the insulated reservoir 44 connected as previously to a supply and pressurization unit 46, communicates with the two circuits 12 a and 12 b via (in particular) two valves 45 a , 45 b controlled, respectively.
  • a first flow sensor 60 is inserted between the outlet of the reservoir 44 and the two common inlets of the two valves 45 a , 45 b .
  • the color changing unit 11 also communicates with the two circuits 12 a and 12 b via (in particular) two controlled valves 64 a , 64 b , while a second flow sensor 61 is inserted between the output of the unit 11 and the two common inlets of the two valves 64 a , 64 b .
  • the pressure regulator 29 is here inserted immediately upstream of the projector 13 or of a group of such projectors. This projector is here common to the two distribution circuits 12 a , 12 b .
  • the purge means 26 are connected immediately upstream of this regulator via a controlled valve 62.
  • the output of the flow sensor 61, associated with the color changing unit is connected by the valve 64 a to a first isolation conduit 20 a extending between the valve 64 a and an inlet of a three-way valve tracks 66 a (of the type with two inputs and one output).
  • Said first conduit insulation 20 therefore plays the same role as the conduit 20 which is described with reference to Figure 1.
  • a three-way valve 65 has two inputs and an output, has one of its inputs connected at the outlet of the valve 45 a and its other inlet connected to a cleaning unit 68 a similar to the unit 35 of the installation of FIG. 1.
  • the output of the valve 65 a is connected to the other inlet of the valve 66 a via a second insulating duct 70 a.
  • valve 66 a The output of the valve 66 a is connected to purge means 22 is controlled via a valve 25 and a conduit section 41a forming the intermediate tank circuit 12 has, via a valve 74 a.
  • each isolation duct is connected, by means of controlled valves, upstream to cleaning means and downstream to purging means.
  • these cleaning units and purging means are automatically electrically isolated at each cleaning phase by the rinsing and drying operations of the insulating conduits which terminate therein, as explained with reference to the embodiment of FIG. 1. It the same is true of the means 46 relative to the rinse aid reservoir 44.
  • the distribution circuit 12 b is strictly identical to the circuit 12 a and the corresponding elements have the same numerical references with the index b instead of a .
  • controlled valves 45 b , 64 b , 25 b , 74 b , 79 b , 27 b , 36 b and 83 b three-way controlled valves 65 b and 66 b , cleaning means 68 b and 35 b , the purge means 22 b and 78 b , the insulation conduits 20 b , 70 b and 82 b and, of course, the insulating conduit forming an intermediate reservoir 41 b . All these elements are interconnected in the same way so that the circuit 12b does not need to be described again.
  • the computer controls all of the valves as well as the pressure regulator 29; it receives signals developed from the two flow sensors 60 and 61.
  • the isolation conduits 82 a and 82 b which have the function only of "holding” the high voltage once rinsed and dry, have smaller sections than other conduits. The quantity of product contained in these conduits is therefore small compared to that which is contained in the section 41 a or 41 b forming the rinsable tank.
  • the conduits 82 a , 82 b and the valves and cleaning means which relate thereto can be omitted if two independent projectors 13 and two groups of such projectors are provided.
  • the operation is as follows.
  • the circuit 12 b is therefore ready to paint, the paint being located between the closed valves 74 b and 27 b . This situation is reached during the projection phase using the distribution circuit 12 a , therefore without loss of time.
  • the circuit 12 b is then isolated from the high voltage by the conduits 70 b , 20 a and 82 b which have been previously cleaned and dried.
  • the downstream end of the insulation conduit 220 is connected to the distribution circuit 212 by means of the valve 221 and to the purging means 222 by means of a controlled valve 225, via a portion of insulating conduit 224.
  • the installation also includes purge means 226 connected via a valve 227, to the distribution circuit 212 at the downstream end thereof, that is to say in the vicinity of the headlamp 213.
  • a rinsable pressure regulator 229 of a known type is connected to the downstream end of the circuit 212, that is to say as close as possible to the headlamp 213.
  • a flow sensor 230 which will be described in detail below, is also inserted into the circuit 212 in the vicinity of its upstream end.
  • a cleaning unit 235 is connected by a valve 236 to the purge means 226, the connection being made in the vicinity of the valve 227 so as to be able to clean and dry the portion of insulating conduit 228 connecting this valve 227 to the purge means 226
  • the purge means 222 and 226 are connected to the ground.
  • the cleaning unit 235 comprises controlled connection means able to successively put in communication with the valve 236, either the rinsing product circulation circuit 217, or the compressed air distribution circuit 218.
  • the conduit 237 connecting the cleaning unit 235 to the valve 236 is an insulating conduit, the unit 235 being grounded.
  • rinsable insulating conduits 220, 224, 237 and 249 are at least partly shaped as a serpentine, preferably oriented substantially horizontally, for the reasons indicated above.
  • the high voltage 213 a is set to zero and the color change unit 111 is controlled to select one of the paints. This flows towards the projector, the valves 221 and 227 being open.
  • the valve corresponding to the paint selected in the unit 211 is closed and that of the circuit 217 is opened simultaneously. From this moment, the painting is thrust by rinse aid coming from circuit 217.
  • the lengths of conduits are calculated so that, when the paint reaches the projector (point B) the "limit" between the rinse aid and the paint, is located at A, c ' that is to say at a point located downstream of the valve 221 and (preferably) downstream of the flow sensor 230.
  • valve 227 is closed and the valves 225 and 245 are opened. This ensures continuity of the pushing fluid (that is to say the rinsing product) between the pressurized reservoir 244 and the distribution circuit 212.
  • the product rinsing which then comes from the reservoir 244, is directed for a short time to the purging means 222 through the valve 225.
  • valves are closed and the valve 225 is opened again.
  • cleaning and then drying of the conduits 228 and 237 is carried out from the cleaning unit 235 and from the conduit 249 from the unit 246.
  • the high voltage is then established and painting begins by opening the valve 245.
  • the flow is constantly monitored and regulated from the flow sensor 230 and the pressure regulator 229, via the computer.
  • the air circulation is maintained in the aforementioned insulating conduits.
  • FIG. 3 shows an installation comprising two distribution circuits in parallel, operating alternately. This installation therefore comprises a greater number of insulating conduits and in particular of insulating conduits as defined, between the color changing unit and each of the circuits of distribution, between the distribution circuits themselves and also between each of the distribution circuits and the projectors.
  • FIGS 5 to 9 show another development of the invention and the structural elements similar to those of Figures 1 to 3 bear the same reference numerals.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Spray Control Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP88402081A 1987-08-14 1988-08-10 Farbspritzanlage für Beschichtungsprodukte, zum Beispiel für wasserlösliche Farbe Expired - Lifetime EP0303541B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
FR8711577A FR2619322B1 (fr) 1987-08-14 1987-08-14 Installation de projection de produit de revetement tel que par exemple une peinture hydrosoluble
FR8711577 1987-08-14
FR8713855 1987-10-07
FR878713855A FR2621500B2 (fr) 1987-08-14 1987-10-07 Installation de projection de produit de revetement tel que par exemple une peinture hydrosoluble
FR8808944 1988-07-01
FR888808944A FR2633532B2 (fr) 1987-08-14 1988-07-01 Installation de projection de produit de revetement tel que par exemple une peinture hydrosoluble

Publications (2)

Publication Number Publication Date
EP0303541A1 true EP0303541A1 (de) 1989-02-15
EP0303541B1 EP0303541B1 (de) 1991-10-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402081A Expired - Lifetime EP0303541B1 (de) 1987-08-14 1988-08-10 Farbspritzanlage für Beschichtungsprodukte, zum Beispiel für wasserlösliche Farbe

Country Status (5)

Country Link
US (1) US4962724A (de)
EP (1) EP0303541B1 (de)
JP (1) JPS6467275A (de)
KR (1) KR890003449A (de)
DE (1) DE3865392D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932623A1 (de) * 1988-09-30 1990-05-31 Binks Mfg Co Anordnung zum zufuehren ausgewaehlter elektrisch leitender beschichtungsmaterialien zu einer mit hochspannung arbeitenden elektrostatischen beschichtungsvorrichtung und entsprechendes zufuehrungsverfahren
EP0620046A1 (de) * 1990-07-18 1994-10-19 Nordson Corporation System zum elektrostatischen Isolieren und Pumpen von elektrisch leitenden Beschichtungsmaterialien
FR2765499A1 (fr) * 1997-07-01 1999-01-08 Honda Motor Co Ltd Appareil de peinture en plusieurs couleurs
CN104824814A (zh) * 2015-05-26 2015-08-12 扬州科润德机械有限公司 一种药液自动喷涂***

Families Citing this family (36)

* Cited by examiner, † Cited by third party
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US4962724A (en) 1990-10-16
DE3865392D1 (de) 1991-11-14
EP0303541B1 (de) 1991-10-09
KR890003449A (ko) 1989-04-14

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