EP0428435B1 - Anlage zum elektrostatischen Auftragen eines leitfähigen Beschichtungsproduktes - Google Patents

Anlage zum elektrostatischen Auftragen eines leitfähigen Beschichtungsproduktes Download PDF

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Publication number
EP0428435B1
EP0428435B1 EP90403141A EP90403141A EP0428435B1 EP 0428435 B1 EP0428435 B1 EP 0428435B1 EP 90403141 A EP90403141 A EP 90403141A EP 90403141 A EP90403141 A EP 90403141A EP 0428435 B1 EP0428435 B1 EP 0428435B1
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EP
European Patent Office
Prior art keywords
tank
conduit
coating product
installation according
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.)
Expired - Lifetime
Application number
EP90403141A
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English (en)
French (fr)
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EP0428435A1 (de
Inventor
Patrice Giroux
Jean Christophe Rey
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Sames SA
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Sames SA
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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
    • 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
    • B05B5/1658—Details
    • B05B5/1666—Voltage blocking valves, e.g. with axially separable coupling elements
    • 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
    • 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

Definitions

  • the invention relates to an installation for applying a relatively conductive coating product, such as for example a water-based paint, by electrostatic means; it relates more particularly to an arrangement allowing rapid changes of coating product which can be carried out during the dead time which elapses between two objects to be covered.
  • a relatively conductive coating product such as for example a water-based paint
  • the conductive coating products are delivered by long circulation circuits, in closed loop, established between large capacity tanks and the different application booths.
  • These circuits of closed loop circulation are necessarily brought to earth potential, for safety reasons and means of electrical isolation must be provided between the parts of circuits connected to earth and those which are brought to high voltage during application coating product electrostatic.
  • US-A-4,313,475 describes an installation comprising only one supply branch, provided with two similar reservoirs placed in line.
  • the first of these tanks supplies said projector and is connected to high voltage at the same time as the latter, while the second is located between the first tank and a coating product change unit.
  • the second reservoir which is used to continuously supply the first reservoir with coating material, is alternately brought to high voltage when it is empty in the first reservoir, then disconnected from high voltage when it is recharged with coating material .
  • electrical isolation means must therefore be provided between each of these reservoirs and the parts of circuits grounded during the electrostatic application of the coating product. This electrical insulation is expensive.
  • the invention makes it possible to solve these problems by proposing a new arrangement making it possible to fill all the autonomous tanks very quickly.
  • the invention therefore relates to an installation for applying a relatively conductive coating product, by electrostatic means, of the type comprising at least one electrostatic headlight connected to an adjustable or interruptible high voltage source, a first reservoir connected to supply said headlight and carried at the potential of said source and a second reservoir having a capacity of the same order of magnitude as that of said first reservoir, means for filling this first reservoir comprising elements brought to the potential of the earth, separated from said first tank by at least one duct element forming a temporary isolation device and means for emptying this second tank, to transfer its contents to said first tank, through a duct element forming a temporary isolation device aforementioned, characterized in that the second tank is permanently brought to earth potential and that said draining means are arranged to ensure rapid transfer of the contents of said second tank to said first tank, in the absence of high voltage.
  • FIG. 1 there is shown schematically a coating product application installation comprising an electrostatic projector 11, here of the type with a rotary spraying member connected to a high voltage source 12 adjustable or interruptible and supplied coating product via a coating product changing unit 13, electrically connected to the ground, permanently and a sampling unit 14, for example carried by the same mobile support as the projector 11.
  • Said sampling unit 14 is inserted between the projector 11 and the outlet of the coating product change unit 13.
  • the latter comprises a set of controlled valves 16 a , 16 b , 16 c ... opening out into a common manifold 13 a .
  • These valves are respectively connected to the flow circuits 18 a, 18 b, 18 c ... of different coating materials, respectively connected to large tanks, not shown.
  • the coating product circulates continuously, under pressure, in such a conduit 18 to supply on demand such or such projector or group of projectors, connected to such or such unit for changing the coating product.
  • Different coating products are electrically conductive. These are for example water-based paints or metallic paints. Otherwise, for safety reasons, these large-capacity tanks and these circulation circuits 18 are electrically maintained at ground potential.
  • the sampling unit 14 comprises elements permanently connected to the ground and others which are brought to high voltage by the conductive coating product, when the high voltage source is effectively connected to the projector 11, that is to say during a whole period of spraying of the coating product on an object.
  • first tank 20 autonomous, of relatively small capacity, for example sufficient to supply the projector 11 during a whole phase of covering an object and a controlled valve. 22 connected between the outlet of the tank 20 and the sprayer 11.
  • the first tank 20 comprises a separator such as a piston 24 or the like for delivering the coating product to the sprayer 11 via the valve 22.
  • This piston delimits in the tank 20 an actuation chamber 25 connected to a source of pressurized fluid, by means of a controlled valve 26.
  • the valve 26 is of the three-way type with venting.
  • the sampling unit 14 includes means for filling the reservoir 20, including the elements brought to earth potential, which are separated from said first reservoir 20 by at least one element of the conduit forming a temporary isolation device 28, which will be described further.
  • These filling means mainly comprise a second tank 30 also of relatively small capacity (for example equal to that of the first tank 20) and permanently brought to the earth potential.
  • the outlet of this second tank is connected to the conduit element forming a temporary isolation device 28, by a controlled valve 34.
  • One end of the manifold 13 a of the coating product change unit 13 is also connected to this second tank 30 by a flexible conduit 35 which can be relatively long.
  • the other end of this collector is connected, by a controlled valve 36, to waste recovery means 38, also kept at ground potential.
  • a second conduit element forming a temporary isolation device 40 is connected between said first tank 20 and said waste recovery means 38.
  • a valve 42 connected to a supply pipe for rinsing product
  • a valve 43 connected to a compressed air supply pipe and a valve 44 establishing the connection with the waste recovery means 38. All these valves are controlled.
  • a supply pipe 46 for organic cleaning product (insulator) is directly connected to the projector 11 via a controlled valve 48.
  • the cleaning product which circulates in the pipe 46 is used exclusively for rinsing the projector 11.
  • the rod of the piston 24 of reservoir 20 is advantageously coupled to a position sensor 58 making it possible to control the flow rate of the coating product discharged towards the projector 11.
  • the same arrangement is provided for reservoir 30, the piston rod of which is coupled to a position sensor 59.
  • the sampling unit 14 comprises means for rapid emptying of the second reservoir 30 to transfer its contents to the first reservoir 20, through the duct element 28.
  • These rapid emptying means are here integrated into the structure of the second tank itself, which for this purpose comprises a separator 50 forming a piston delimiting in the tank the coating product chamber and an actuation chamber 52 connected to a source of pressurized fluid 54, here compressed air, via a controlled valve 56.
  • the valve 56 is of the three-way type with venting.
  • the piston 50 is a stepped piston.
  • FIG. 2 shows in detail one of the duct elements forming a temporary insulation device 28 or 40 in FIG. 1.
  • a temporary insulation device 28 or 40 in FIG. 1.
  • Such a device comprises a section of insulating duct 112 of a predetermined length, a scraper piston 114 of the internal wall of this section of pipe and means for moving this scraper piston in said section of pipe.
  • the scraper piston is provided with an O-ring 115 made of elastomeric material which is applied against the internal wall of the section of conduit.
  • the means for moving the piston are constituted by a jack 116, here a double-acting pneumatic valve, located in the extension of the section of conduit 112 and whose rod 118, made of insulating material, is fixed to said scraping piston 114 .
  • the length of the insulating duct section 112 is predetermined so that the leakage current remains below a chosen value, in the presence of a given high voltage, between its ends, as soon as the internal surface of said duct section is sufficiently rid of conductive product by said scraping.
  • the insulating duct section 112, straight is defined in a cylindrical block 120 of electrically insulating rigid material and this block also forms the body of the jack 116 arranged in the axial extension of the duct section 112.
  • This jack pneumatic 116 is delimited axially by two walls 112, 124 having the form of plugs screwed into tapped parts of a cylindrical recess 126 formed in the block 120.
  • the wall 122 separates the actuator from a cavity 128, cylindrical, provided with an annular extension 129 surrounding the section of conduit 112.
  • the wall 124 closes an open end of the recess 126 and comprises an orifice 132 for connection to a source of pressurized air, not shown.
  • Another orifice 133 for connection to a source of pressurized air is provided near the wall 122.
  • the piston 134 of the jack 116 moves in the recess 126 between the two orifices 132 and 133.
  • the rod 118 is fixed by the one of its ends to the piston 134 and passes through the wall 122, which houses an O-ring 135 ensuring the seal between the jack and the cavity 128.
  • the section of insulating conduit 112 is directly connected to an orifice 136, on the side of its end opposite the cylinder and it communicates with a orifice 138 opening into the annular extension 129, via an isolation valve 140.
  • the latter arranged in the vicinity of one end of said insulating duct section 112 has the function of interrupting the circulation of liquid between the neighboring orifice 138 and the insulating duct section 112. It is constantly urged towards its closed position and it is actuated at the opening by the scraping piston itself, when the latter is in the vicinity of this end of said insulating duct section 112, that is to say when it is in abutment on the side of the actuating cylinder 116.
  • said isolation valve 140 comprises an annular isolation valve 145 provided with a cylindrical sleeve 141 sliding on an internal surface 142 of the annular extension 129 of the cavity 128.
  • the orifice 138 communicates with this annular extension 129 and the sleeve 141 has a passage 143 (here a simple hole) allowing the liquid to flow e.
  • the seal between the orifice 138 and the portion of conduit 112 is ensured by the support of the end surface of the bearing surface 142 against the facing surface of the valve 145 which can be provided with an elastic seal.
  • the cavity 128 is coaxial with the section of conduit 112 and it communicates with it so that the tubular valve 145 is subject to movement in the axial extension of the section of conduit 112 of which it constitutes one of the ends. It is in fact provided with a hole 146 extending the section of conduit 112 and of the same diameter as the latter.
  • the scraper piston 114 can engage at the end of its travel in this drilling until it meets a shoulder 147.
  • a spring 144 is installed in the cavity 128 between the fixed wall 122 and a shoulder of said tubular valve 145.
  • said cavity 128 is in communication, through an orifice 148, with a source of compressed air, not shown.
  • the pressure which is thus established in the cavity 128 also urges the valve 145 towards its closed position.
  • This pressure is exerted, thanks to the presence of a hole 150 of the valve, on the rear face of the scraper piston, that is to say that which is not in contact with the liquid present in the section of conduit 112.
  • the piston 114 is thus subjected to an air back pressure opposing the pressure exerted by the liquid in the section of duct 112.
  • This arrangement allows a certain balancing of the pressures, on either side of the scraping piston 114 and defines a sort of "joint air "preventing infiltration of liquid along the side wall of the scraper piston and extending the life of the O-ring 115.
  • the scraper piston 114 continues its stroke in the section of duct 112 by repelling the liquid and simultaneously cleaning the internal part of said duct so that when it reaches the end of its travel, there is a portion of insulating duct in the circuit. sufficiently free of conductive product to "hold" a predetermined high voltage.
  • the first reservoir 20 is filled with a coating product and that pressurized fluid is introduced into the chamber 25.
  • the coating product is therefore discharged towards the projector 11 brought to high voltage, through the valve 22 opened.
  • the two duct elements 28 and 40 are in respective positions keeping their duct elements 112 sufficiently clean and dry.
  • the high voltage source is therefore correctly isolated from the earthed elements.
  • the coating product change unit 13 and the purge duct by injecting the rinsing product and the air, under the control of the valves 42 and 43 in these elements, the valves 34 and 36 being open. Then, the valves 36, 42 and 43 are closed and the valve 44 is opened, then one of the valves 16 a , 16 b or 16 c ... until the product reaches the valve 44 which is then closed. A predetermined quantity of a new product is then introduced into the reservoir 30 under the control of the position sensor 59 coupled to the piston of the reservoir 30. The installation remains in this state until the end of the electrostatic projection phase, c that is to say until the piston 24 of the reservoir 20 has discharged all of the coating product to the projector 11.
  • the volumes to be cleaned and the residual quantities of coating product to be removed "on the right" of the duct elements 28, 40 when considering FIG. 1, are very weak.
  • the high voltage is brought to zero and the valve 22 is closed.
  • the displacement of the pistons 114 is then controlled in the two duct elements 28 and 40, which makes it possible to establish a circulation of rinse aid and air, under the control of the valves 42 and 43, which ensures the elimination of the traces of the coating product which has just been used in the reservoir 20 and the neighboring conduits.
  • the valve 22 is opened for a short time to clean the section of conduit between this valve and the projector 11. During this time, the projector 11 is cleaned with insulating solvent injected through the conduit 46 and the valve 48.
  • valve 34 is open and the rapid transfer of the new coating product from the reservoir 30 to the reservoir 20 begins, until the circuit is filled with the new coating product, upstream of the conduit element 40, under control of the sensor 59 associated with the reservoir 30.
  • the conduit element forming an isolation device 40 is then controlled to isolate the reservoir 20 from the waste recovery means 38.
  • the valve 26 is then vented and the rapid transfer of the new product continues by pushing the piston 24 of the reservoir 20. It is understood that the choice of the two diameters of the piston 50 and / or of the pressure of the fluid delivered by the source 54 make it possible to control the time of transfer of the coating product to the reservoir 20.
  • the source 54 can deliver a fluid under relatively high pressure, if necessary, for example twice the pressure of the other fluids distributed in the installation.
  • the stepped piston 52 constitutes a pressure amplifier. At the end of this transfer, the movement of the scraper piston 114 in the conduit element forming an isolation device 28 completes pushing the coating product into the tank 20 and simultaneously ensures the electrical isolation of this tank and of the projector. 11. High voltage is restored and a new phase of electrostatic projection, on a new object, can begin. Since the transfer of the coating product to the reservoir 20 no longer depends on the pressure with which the product is delivered by the coating product changing unit 13, it is always ensured that all the cleaning and filling operations of the reservoir 20, can be carried out in a shorter time than a dead time defined above, during which the high voltage can be reduced to zero or to a low value.
  • FIG. 3 a variant of the duct element forming an insulation device has been shown.
  • This variant consists of a controlled connection arrangement 211 forming a quick coupling, mechanically actuated. So in this variant, the electrical insulation is produced by distancing two parts of said duct element. It is intended, for example, to replace the device 28 of FIG. 1. A similar device could be used to replace the isolation device 40.
  • This connection device 211 essentially comprises two separable sub-assemblies, namely a first end piece 212 in which an outlet 213 for the fluid is defined and a second endpiece 214 in which an inlet 215 for the same fluid is defined. The input and the output are defined here with respect to the direction of connection of the device 28 in FIG. 1.
  • the two end pieces can be assembled end to end in a common axial direction, as shown.
  • the endpiece 212 has an end 218 in the form of a transverse annular wall, in the center of which is arranged a first valve 220 movable axially inside a cavity in communication with the outlet 213, this valve is biased by a spring 222 towards a seat 223, to isolate the outlet 213.
  • the valve has a convex surface 224 in the form of a spherical cap. When the valve is in application on its seat, this convex surface projects slightly beyond the wall constituting the end 218.
  • the end piece 214 comprises a tubular element 225 inside which an inlet duct 215 a is defined axially in communication with the inlet 215 and one end of which, opening onto a transverse surface 226, intended to be applied against the face of the end 218, comprises a frustoconical part forming the seat 227 of a second valve 228.
  • This arrangement makes it possible to isolate said inlet 215.
  • the second valve 228, of generally frustoconical shape has a concave end surface 230 in the form of a spherical cap, coming to bear against the surface 224 of the valve 220.
  • the two spherical caps are preferably of the same radius so that there can be practically no air space between the two valves, after assembly.
  • the two valves are respectively provided with mutual contact surfaces of complementary shapes. They are arranged to be able to move together while remaining in contact, so as to allow the fluid to flow from the inlet 215 to the outlet 213.
  • the outside diameter of the valve 228 is somewhat less than the diameter of the orifice of the seat 223 of said first valve, so that, when the valve 228 is pushed away from its seat 227, it also separates the valve 220 from its seat 223, allowing the flow of fluid between the inlet 215 and the outlet 213.
  • the endpiece 214 also includes means for cleaning the two valves and, more generally, the entire interface for joining the two end pieces.
  • these cleaning means comprise a coaxial element 235 mounted externally to the tubular element 225.
  • These two elements are mounted with the possibility of relative axial sliding. This sliding is limited by a circlip 236 fixed to the element 225.
  • Said coaxial element 235 is capable of being applied and fixed against the end 218 of said first end piece 212 and of being fixed there.
  • the coaxial element 235 therefore forms a sort of sliding sleeve while the tubular element 225 comprises, at its end, an external element making it possible to define, with said coaxial element 235 and the end 218 of the first end piece, an annular chamber 237 d cleaning fluid injection.
  • the walls of this chamber 237 are advantageously treated to avoid the adhesion of the fluids used, they are for example covered with polytetrafluoroethylene.
  • the cleaning fluid in question is at least one rinsing liquid suitable for the nature of the product and preferably also compressed air injected after rinsing proper.
  • a seal 238 prevents any leakage to the outside.
  • the mechanical joining of the two end pieces is carried out here, thanks to balls 239 engaged in corresponding holes of a cylindrical skirt 240 of the coaxial element 235. Externally there is a tubular locking element 242 sliding on the coaxial element and comprising a ramp 244 with a slight slope, ensuring the maintenance of the balls in their holes.
  • the blocking element is biased towards the balls by a spring 246 mounted in compression between the blocking element and a circlip 247 integral with the coaxial element 235.
  • An actuation chamber 248 is defined between the elements 235 and 242. Compressed air is injected into it to release the balls.
  • a shoulder bush 249 limits the stroke of the element 242 under the effect of compressed air. It surrounds the spring 246 and rests on the circlip 247.
  • a spring 255 is mounted between two respective shoulders of the coaxial element 235 and of the tubular element 225. The action of this spring therefore tends to push the tubular element 225 axially outside the coaxial element 235. In this way, when said coaxial element is locked to said first end piece 212, the end of the tubular element 225 is applied by the force of the spring 255 against the end 218.
  • the coaxial element 235 comprises at least one inlet pipe for cleaning fluid 262 (rinsing liquid and / or drying air) and one outlet pipe for cleaning fluid 264. These pipes 262 and 264 open onto the internal face. of the coaxial element 235 in locations allowing them to communicate with said annular chamber 237.
  • the cleaning fluid outlet duct 264 has a calibrated flow restriction 266.
  • the second valve 228 is integral with a rod 268 that axially extends through a wall 269 separating said inlet conduit 215 has a cylinder 272 arranged in a cylindrical cavity of said second end cap 273.
  • the rod 268 is fixed to the piston 275 of this jack.
  • a control fluid can be injected through an orifice 276 into one of the chambers of the jack to urge the piston in a direction tending to separate the valve 228 from its seat 227.
  • a spring 278 is mounted in said cavity between one of the its axial ends and the piston so as to urge said second valve 228 in the closed position, against the seat 227.
  • the two valves oppose any fluid outlet, the spring 278, in particular, developing a force sufficient to keep the valve 228 in application against its seat 227.
  • the chamber 248 being pressurized to release the balls 239, the two end pieces 212 and 214 can be brought together.
  • the coupling has the effect, firstly, of applying the seal 252 against the end 218, then of applying the valve 220 against the valve 228 and the surface 226 against the end 218 of the nozzle 212.
  • the compression of the spring 255, at the end of the connection stroke allows the face 218 of the endpiece 212 to come into contact with the seal 238.
  • the depressurization of the chamber 248 allows the spring 246 to provide support for the coaxial element 235 against the end 218 of the endpiece 212, thanks to the combined actions of the ramp 244, the balls 239 and the inclined blank 251 of the groove 250.
  • the annular chamber 237 is then defined.
  • valve 228 separates from its seat 227 and pushes the valve 220.
  • the fluid can therefore circulate from the inlet 215 to the outlet 213. This is what occurs during the transfer of the coating product from the reservoir 30 to the reservoir 20.
  • the device which has just been described as a variant can replace, as we have seen, the duct element 28.
  • a similar device replaces the duct element 40.
  • All the air and rinse aid supply circuits are mounted on the side of the two end pieces 214, fixed on the sampling device 14.
  • the two end pieces 212, movable are connected by flexible flexible pipes coils to the tank 20. They are moved jointly by a jack, not shown.
  • the two movable nozzles 212 are kept away from the two nozzles 214.
  • the operations of cleaning the devices 211 and transferring the coating product can be carried out during the dead time defined above.

Landscapes

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

Claims (11)

  1. Anlage zum elektrostatischen Auftragen eines leitfähigen Beschichtungsproduktes mit mindestens einem elektrostatischen Spritzgerät (11), das mit einer einstellbaren oder abschaltbaren Hochspannungsquelle (12) verbunden ist, mit einem ersten zur Versorgung des Spritzgerätes angeschlossenen und auf dem Potential der Quelle gehaltenen Behälter (20) und einem zweiten Behälter (30), dessen Fassungsvermögen in der gleichen Größenordnung wie dasjenige des ersten Behälters (20) liegt, mit Mitteln zum Füllen des ersten Behälters, die auf Erdpotential gehaltene und vom ersten Behälter durch mindestens ein eine Vorrichtung zum zeitweiligen Abdichten bildendes Leitungselement (28) aufweist, und mit Mitteln (50, 54, 56) zum Entleeren dieses zweiten Behälters, um seinen Inhalt durch ein die zeitweilige Abdichtvorrichtung (28) bildendes Leitungselement zum ersten Behälter zu transportieren, dadurch gekennzeichnet, daß der zweite Behälter (30) ständig auf Erdpotential gehalten ist, und daß die Mittel zum Entleeren derart angeordnet sind, daß sie in Abwesenheit von Hochspannung einen raschen Transport des Inhalts des zweiten Behälters zum ersten Behälter gewährleisten.
  2. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß der zweite Behälter (30) einen Separator (50), wie einen Kolben, der eine Betätigungskammer (52) begrenzt, die mit einer Quelle (54) eines Druckfluides, beispielsweise von Druckluft, über ein gesteuertes Ventil (56) verbunden ist, sowie eine Kammer für das Beschichtungsprodukt aufweist.
  3. Anlage nach Anspruch 2, dadurch gekennzeichnet, daß die Druckfluidquelle einen Druck hat, der höher als die Drücke der weiteren in der Anlage verteilten Fluide ist.
  4. Anlage nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Separator (50) einen Druckverstärker bildet.
  5. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der zweite Behälter (30) mit einer an sich bekannten Beschichtungsprodukt-Wechseleinheit (13) verbunden ist.
  6. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein erstes eine Vorrichtung zum zeitweiligen Abdichten bildendes Leitungselement (28) zwischen die zwei Behälter geschaltet ist, und daß ein zweites eine Vorrichtung zum zeitweiligen Abdichten bildendes Leitungselement (40) zwischen den ersten Behälter (20) und ständig auf Erdpotential gehaltene Mittel (38) zur Rückgewinnung von Abfallstoffen geschaltet ist.
  7. Anlage nach Anspruch 6, dadurch gekennzeichnet, daß Mittel (42) zur Versorgung mit Spülmittel und Mittel (43) zur Versorgung mit Druckluft zwischen den zweiten Behälter (30) und das erste Leitungselement (28) geschaltet sind.
  8. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein eine Vorrichtung zum zeitweiligen Abdichten bildendes Leitungselement ein isolierendes Leitungsstück (112) festgelegter Länge, das einen an den jeweiligen Enden dieses Leitungsstücks vorgesehenen Flüssigkeitseinlaß und -auslaß besitzt, sowie einen Schabkolben (114) der Innenwand des Leitungsstücks, der in dessen Innerem beweglich ist, und Mittel (116) zum Verschieben des Schabkolbens im Leitungsstück aufweist.
  9. Anlage nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß ein eine Vorrichtung zum zeitweiligen Abdichten bildendes Leitungselement von einer gesteuerten, einen schnellen Anschluß herstellenden Verbindungsvorrichtung (211) gebildet ist.
  10. Anlage nach Anspruch 9, dadurch gekennzeichnet, daß die Verbindungsvorrichtung aufweist:
    - einen ersten Rohrnippel (212), der ein elastisch in Richtung eines ersten Ventilsitzes (223) beaufschlagtes erstes Ventilorgan (220) zum Abdichten einer Fluidleitung umschließt,
    - einen zweiten Rohrnippel (214), der ein eine weitere Leitung (215a) bildendes rohrförmiges Teil aufweist und ein elastisch in Richtung eines zweiten Ventilsitzes (224) beaufschlagtes Ventilorgan (228) zum Abdichten der weiteren Leitung umschließt,
    - daß die zwei Ventilorgane jeweils mit gegenseitig formkomplementären Kontaktflächen versehen sind, und daß sie derart angeordnet sind, daß sie sich zusammen verschieben lassen und dabei in Kontakt bleiben, so daß der Durchfluß des Fluids ermöglicht wird, und
    - daß die Verbindungsvorrichtung des weiteren Mittel zum Reinigen der Stoßflächen der zwei Rohrnippel, insbesondere derjenigen der zwei Ventilorgane, aufweist.
  11. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß mindestens einer der zwei Behälter (20, 30) einen Separator (24, 50), beispielsweise einen Kolben, aufweist, um das Beschichtungsprodukt zu fördern, und daß der Separator mit Mitteln (58, 59) zum Steuern der Position verbunden ist, die die Bestimmung der Menge oder des Durchsatzes an diesem Behälter zufließendem oder daraus abfließendem Beschichtungsprodukt gestattet.
EP90403141A 1989-11-14 1990-11-06 Anlage zum elektrostatischen Auftragen eines leitfähigen Beschichtungsproduktes Expired - Lifetime EP0428435B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8914912 1989-11-14
FR8914912A FR2654365B1 (fr) 1989-11-14 1989-11-14 Installation d'application de produit de revetement conducteur, par voie electrostatique.

Publications (2)

Publication Number Publication Date
EP0428435A1 EP0428435A1 (de) 1991-05-22
EP0428435B1 true EP0428435B1 (de) 1993-05-26

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EP90403141A Expired - Lifetime EP0428435B1 (de) 1989-11-14 1990-11-06 Anlage zum elektrostatischen Auftragen eines leitfähigen Beschichtungsproduktes

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US (1) US5094389A (de)
EP (1) EP0428435B1 (de)
JP (1) JPH03178354A (de)
KR (1) KR0124188B1 (de)
CA (1) CA2029606C (de)
DE (1) DE69001744T2 (de)
ES (1) ES2040578T3 (de)
FR (1) FR2654365B1 (de)

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US5255856A (en) * 1990-11-08 1993-10-26 Honda Giken Kogyo Kaubshiki Kiasha Electrostatic spray painting apparatus
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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
US5526986A (en) * 1994-11-01 1996-06-18 Graco Inc Waterbase voltage block and paint valve
US5549755A (en) * 1994-12-08 1996-08-27 Nordson Corporation Apparatus for supplying conductive coating materials including transfer units having a combined shuttle and pumping device
DE4444671A1 (de) * 1994-12-15 1996-06-20 Abb Patent Gmbh Lackförderpumpe
US5647542A (en) * 1995-01-24 1997-07-15 Binks Manufacturing Company System for electrostatic application of conductive coating liquid
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US5947392A (en) * 1997-09-12 1999-09-07 Noroson Corporation Two-component metering and mixing system for electrically conductive coating material
DE19756488A1 (de) 1997-12-18 1999-07-01 Lactec Gmbh Verfahren und Vorrichtung zum Isolieren eines elektrisch leitenden Strömungsmediums
US6423143B1 (en) 1999-11-02 2002-07-23 Illinois Tool Works Inc. Voltage block monitoring system
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EP1772194B1 (de) 2005-10-07 2019-01-09 Dürr Systems AG Beschichtungsmittel-Versorgungseinrichtung und zugehöriges Betriebsverfahren
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DE19640015C2 (de) * 1995-11-20 2000-12-07 Honda Motor Co Ltd Vorrichtung zum elektrostatischen Sprühbeschichten eines Werkstücks

Also Published As

Publication number Publication date
KR910009339A (ko) 1991-06-28
FR2654365A1 (fr) 1991-05-17
EP0428435A1 (de) 1991-05-22
ES2040578T3 (es) 1993-10-16
CA2029606C (fr) 1999-07-13
US5094389A (en) 1992-03-10
DE69001744T2 (de) 1993-11-11
JPH03178354A (ja) 1991-08-02
DE69001744D1 (de) 1993-07-01
FR2654365B1 (fr) 1992-02-21
CA2029606A1 (fr) 1991-05-15
KR0124188B1 (ko) 1997-11-25

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