EP1926560B1 - Installation for spraying a multicomponent coating product - Google Patents

Installation for spraying a multicomponent coating product Download PDF

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Publication number
EP1926560B1
EP1926560B1 EP06808150A EP06808150A EP1926560B1 EP 1926560 B1 EP1926560 B1 EP 1926560B1 EP 06808150 A EP06808150 A EP 06808150A EP 06808150 A EP06808150 A EP 06808150A EP 1926560 B1 EP1926560 B1 EP 1926560B1
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EP
European Patent Office
Prior art keywords
component
installation according
feed circuit
installation
tank
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.)
Not-in-force
Application number
EP06808150A
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German (de)
French (fr)
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EP1926560A1 (en
Inventor
Cédric LE STRAT
Caryl Thome
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sames Kremlin SAS
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Sames Technologies SAS
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Publication of EP1926560A1 publication Critical patent/EP1926560A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • 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
    • B05B12/004—Arrangements for controlling delivery; Arrangements for controlling the spray area comprising sensors for monitoring the delivery, e.g. by displaying the sensed value or generating an alarm
    • B05B12/006—Pressure or flow rate sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1418—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 for supplying several liquids or other fluent materials in selected proportions 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
    • B05B5/1675—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
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to 3D-surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0447—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles
    • B05B13/0452—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles the conveyed articles being vehicle bodies

Definitions

  • the present invention relates to a multi-component coating product spraying apparatus comprising a first electrically conductive component and at least a second component. Within the meaning of the invention, are called second component or components added to the first component to form the multi-component coating product.
  • EP-A-1 473 090 which discloses the features of the preamble of claim 1, to use an electrostatic spraying device for projecting a two-component paint.
  • the mixing of the components is performed prior to distribution to the projector, using a static mixer, and the power supply of the mixer is carried out using gear pumps.
  • the use of such a device is problematic in the case where the product to be sprayed has a low resistivity, for example in the case of water-soluble paints. In this case, it is advisable to avoid any short circuit between the headlamp, which is brought to a high voltage, and the distribution circuits of the components constituting the coating product, which are connected to the ground.
  • insulating conduits of very large length and cross-section should be used, leading to unacceptable losses of coating material.
  • the invention more particularly intends to remedy by proposing a multi-component coating product spraying installation making it possible to ensure the insulation between the headlamp and the distribution circuit of the components constituting the coating product. .
  • the invention relates to a multi-component coating product projection installation, the multi-component product comprising a first electrically conductive component and at least a second electrically insulating or weakly conductive component.
  • This installation is characterized in that it comprises firstly a main tank, carried by a mobile part of a robot also carrying an electrostatic spotlight, this tank being provided with temporary connection means with a distribution circuit of the first component and brought to a high voltage when the connection means are not connected, and, secondly, a continuous supply circuit of the or each second component, the main reservoir containing the first component and the supply circuit each second component being carried by the mobile part of the robot and connected to power the projector.
  • the electrical insulation between the headlamp and the distribution circuit of the first electrically conductive component is ensured since the distribution circuit of the first component is physically isolated, during the projection phases, the part of the robot carried to high voltage.
  • the or each second component supply circuit isolates the second component source from the high voltage due to the low conductivity of the second component.
  • a robot 1 is disposed near a conveyor 2 carrying objects to be coated, in this case bodies 3 motor vehicles.
  • the robot 1 is of multi-axis type and comprises a frame 4, mobile on a guide 5 extending parallel to the conveying direction X-X '.
  • An arm 6 is supported by the frame 4 and comprises a plurality of segments 6a, 6b, 6c hinged relative to each other.
  • the frame 4 consists of parts 4a and 4b articulated with respect to each other about a substantially vertical axis ZZ '.
  • the segment 6c of the arm 6 supports an assembly comprising a reservoir 7, a rotating projector 8 and a plate 9 in which are formed ducts connecting the reservoir 7 to the projector 8, one of these ducts being shown on the figures 1 and 2 with reference 72.
  • the projector 8 is of the electrostatic type and is connected to an adjustable high-voltage generator (not shown). The generator is set to zero outside the projection periods of the projector 8.
  • the product contained in the reservoir 7 is a first component of a multi-component coating product, for example a water-soluble base.
  • This base is electrically conductive, that is to say has a low resistivity of the same order of magnitude as that of water, incompatible with a setting to high voltage direct, less than 1 Mohm.cm, preferably less than 1 kohm.cm.
  • a second tank 10 is mounted on the robot 1, close to the segment 6c, and is connected to the projector 8 by ducts formed in the plate 9, one of these ducts being shown on the figures 1 and 2 with reference 102.
  • This reservoir 10 is intended to contain a second component, for example an electrically insulating additive such as a hardener or a catalyst.
  • the mixture of the base and this additive in predetermined proportions forms the multi-component coating product to be sprayed.
  • the additive is electrically insulating or weakly conductive in that it has a resistivity greater than 10 Mohm.cm.
  • the projector 8 is used to project on the body 3 of the multi-component coating product obtained by mixing the components from the tanks 7 and 10.
  • the reservoir 7 is provided on its external surface with a connector 71 intended to cooperate with a connector 11 provided at a stationary position on a partition 12 of the coating booth C in which the robot 1 is installed.
  • the connector 11 is connected by a leads 111 to a unit 112 for changing the base of the coating product, which allows to feed the connector 11 in different types of bases for the coating product, depending on the nature of the product to be projected on the next body 3 arriving in look of the robot 1.
  • the reservoir 10 is connected by a conduit 101 to an additive source S, such as a reservoir of relatively large capacity.
  • the feed circuit of the additive can be raised to high voltage or to a floating potential or intermediate.
  • the tank 10 and the duct 101 are designed so that the supply circuit of the additive is maintained at the potential of the earth, including during the projection phases where the projector is supplied with coating material and connected to the high-voltage generator which is activated.
  • the additive is insulating or weakly conductive allows the corresponding circuit 101, 10, 102 to be brought to an electrical potential different from its environment.
  • the source S may be at a different potential from the portion of the projector 8 brought to the high voltage.
  • a feed circuit is provided for each of these additives.
  • tanks 7 and 10 are piston tanks controlled by electric stepper motors M 7 and M 10 .
  • the filling of the tank 7 takes place when the connector 71 cooperates with the connector 11.
  • the filling of the tank 10 is ensured continuously by the pipe 101.
  • Two valves 73 and 103 act as shut-off valves for filling the tanks 7 and 10.
  • each of the tanks 7 and 10 injects the corresponding component to the projector 8 through a conduit 78.
  • the duct 78 has its origin at the junction J between the conduit 72 from the reservoir 7 and the conduit 102 from the reservoir 10.
  • the motor M 7 actuates the piston 75 of the reservoir 7 so as to inject the base towards the conduit 78 and the projector 8, through the conduit 72.
  • the motor M 10 actuates the piston 105 of the reservoir 10 to inject the additive to the conduit 78 and the projector 8, through the 102.
  • Two valves 77 and 107 are respectively provided in the ducts 72 and 102 and act as cut-off valves for injecting the two components towards the duct 78 and the projector 8.
  • the ratio of the surfaces S 75 of the piston 75 and S 105 of the piston 105 is substantially equal to the mixing ratio of the base and the additive of the multi-component coating product, that is to say to the ratio volume flow rates of the base and the additive.
  • the surface S 75 of the piston 75 of the reservoir 7 containing the base may in particular be greater than the surface S 105 of the piston 105 of the reservoir 10 containing the additive. Such a difference in surfaces has not been represented on the figure 3 for the sake of simplicity.
  • the speed of movement of the pistons 75 and 105 can also be adjusted to obtain an optimal dosage of the components.
  • a restriction 13 is provided on the conduit 102 to control the flow rate of the additive and the total flow rate of the coating product to the projector 8.
  • the measurement of the pressure upstream and downstream of the restriction 13 by means of two sensors 15 and 16 make it possible to determine, by means of a calculation unit 17, the pressure drop in the restriction 13 and thus to check, if the viscosity of the additive is known, that the value of the additive flow is correct.
  • the pressure measurement performed by the sensor 16 also makes it possible to determine the value of the pressure drop between the conduit 102 and the outlet of the injector 84 of the projector 8, which is at atmospheric pressure. Since the viscosity of the mixture is known, it is then possible to check the value of the total flow rate of the coating product. It is thus possible, on the one hand, to regulate these flows under transient conditions and, on the other hand, to control them under steady state conditions.
  • the flow rates can be checked without knowing the viscosities of the components of the mixture, provided that the sensors 15 and 16 and the unit 17 have been previously calibrated.
  • the elements 13 to 17 can be replaced by any type of adapted flowmeter.
  • the sensor 16 can be kept to allow checking the total flow of the mixed product.
  • the base and the additive pass through the plate 9 and are mixed in the projector 8 before projection of the multi-component product obtained on the bodywork 3.
  • the mixture of the base and the additive is made using at least one mixer 14 disposed downstream of the junction J and housed in the injector door 83 of the projector 8. More specifically, the base and the additive pass firstly through the body 81 of the projector 8 and then are directed in a succession of static mixers 14. In the example described, and as represented by the arrows F at the figure 4 the base and the additive pass into three successive static mixers 14.
  • the static mixers 14 consist of a succession of grids, baffles and entangled propellers, so that a homogeneous mixture of the base and the additive is ensured.
  • the mixture obtained which corresponds to the multi-component coating product to be sprayed, then passes into the injector 84 and into the bowl 85 of the projector 8.
  • the bowl 85 is mounted on a rotor 86, partially shown in FIG. figure 4 , as well as its protective cover 87.
  • the multi-component coating product is projected onto the body 3 from the rotating bowl 85.
  • the installation described thus makes it possible, on the one hand, to provide electrical insulation between the projector 8 and the electrically conductive base distribution circuit 11, and, on the other hand, the optimal mixture of the base and the additive constituting the product to be sprayed.
  • the installation of at least one mixer 14 in the injector holder 83 makes it possible to limit the number of parts of the installation in which the mixed product circulates. Thus, in the event of an incident, for example a dosing error, only the injector holder 83 and the injector 84 are to be replaced.
  • the supply circuit of the additive comprises a piston tank for injecting the additive to the projector 8.
  • the additive can be injected to the projector 8 by means of a gear pump.
  • the invention has been described with a multi-axis robot. However, it is applicable regardless of the type of robot, provided that a reservoir of a first component and at least a second component power circuit are embedded on a moving part of the robot.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Spray Control Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

An installation for spraying a multi-component coating material composed of at least one robot having a moving portion carrying at least one electrostatic sprayer, the coating material having an electrically-conductive component together with at least one second component that is electrically insulating or poorly conductive. The installation further includes a main tank fitted with a unit for making a temporary connection with a circuit for dispensing the first component, and being raised to a high voltage when the connection unit not connected, and a feed circuit for continuously feeding the at least one second component. The main tank and the at least one second component feed circuit are carried by the moving portion of the robot and connected to feed the sprayer.

Description

La présente invention a trait à une installation de projection de produit de revêtement multi-composant comportant un premier composant électriquement conducteur et au moins un deuxième composant. Au sens de l'invention, sont appelés deuxième composant le ou les composants ajoutés au premier composant pour former le produit de revêtement multi-composant.The present invention relates to a multi-component coating product spraying apparatus comprising a first electrically conductive component and at least a second component. Within the meaning of the invention, are called second component or components added to the first component to form the multi-component coating product.

Il est connu de EP-A-1 473 090 , qui divulgue les caractéristiques du préamble de la revendication 1, d'utiliser un dispositif de projection électrostatique pour projeter une peinture bicomposant. Dans ce dispositif, le mélange des composants est réalisé préalablement à la distribution au projecteur, à l'aide d'un mélangeur statique, et l'alimentation du mélangeur est réalisée à l'aide de pompes à engrenage. L'utilisation d'un tel dispositif pose des problèmes dans le cas où le produit à projeter a une faible résistivité, par exemple dans le cas de peintures hydrosolubles. Dans ce cas, il convient d'éviter tout court-circuit entre le projecteur, qui est porté à une haute tension, et les circuits de distribution des composants constituant le produit de revêtement, qui sont reliés à la terre. Pour que le courant de fuite soit acceptable, il faudrait utiliser des conduits isolants de longueur et de section très importantes conduisant à des pertes de produit de revêtement inacceptables.It is known to EP-A-1 473 090 , which discloses the features of the preamble of claim 1, to use an electrostatic spraying device for projecting a two-component paint. In this device, the mixing of the components is performed prior to distribution to the projector, using a static mixer, and the power supply of the mixer is carried out using gear pumps. The use of such a device is problematic in the case where the product to be sprayed has a low resistivity, for example in the case of water-soluble paints. In this case, it is advisable to avoid any short circuit between the headlamp, which is brought to a high voltage, and the distribution circuits of the components constituting the coating product, which are connected to the ground. In order for the leakage current to be acceptable, insulating conduits of very large length and cross-section should be used, leading to unacceptable losses of coating material.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant une installation de projection de produit de revêtement multi-composant permettant d'assurer l'isolation entre le projecteur et le circuit de distribution des composants constituant le produit de revêtement.It is to these drawbacks that the invention more particularly intends to remedy by proposing a multi-component coating product spraying installation making it possible to ensure the insulation between the headlamp and the distribution circuit of the components constituting the coating product. .

Dans cet esprit, l'invention concerne une installation de projection de produit de revêtement multi-composant, le produit multi-composant comportant un premier composant électriquement conducteur et au moins un deuxième composant électriquement isolant ou faiblement conducteur. Cette installation est caractérisée en ce qu'elle comprend d'une part un réservoir principal, porté par une partie mobile d'un robot portant également un projecteur électrostatique, ce réservoir étant muni de moyens de raccordement temporaire avec un circuit de distribution du premier composant et porté à une haute tension lorsque les moyens de raccordement ne sont pas raccordés, et, d'autre part, un circuit d'alimentation en continu du ou de chaque deuxième composant, le réservoir principal contenant le premier composant et le circuit d'alimentation de chaque deuxième composant étant portés par la partie mobile du robot et connectés pour alimenter le projecteur.In this spirit, the invention relates to a multi-component coating product projection installation, the multi-component product comprising a first electrically conductive component and at least a second electrically insulating or weakly conductive component. This installation is characterized in that it comprises firstly a main tank, carried by a mobile part of a robot also carrying an electrostatic spotlight, this tank being provided with temporary connection means with a distribution circuit of the first component and brought to a high voltage when the connection means are not connected, and, secondly, a continuous supply circuit of the or each second component, the main reservoir containing the first component and the supply circuit each second component being carried by the mobile part of the robot and connected to power the projector.

Grâce à l'invention, l'isolation électrique entre le projecteur et le circuit de distribution du premier composant électriquement conducteur est assurée puisque le circuit de distribution du premier composant est physiquement isolé, lors des phases de projection, de la partie du robot portée à la haute tension. Le ou chaque circuit d'alimentation en deuxième composant isole la source de deuxième composant de la haute tension du fait de la faible conductivité du deuxième composant.Thanks to the invention, the electrical insulation between the headlamp and the distribution circuit of the first electrically conductive component is ensured since the distribution circuit of the first component is physically isolated, during the projection phases, the part of the robot carried to high voltage. The or each second component supply circuit isolates the second component source from the high voltage due to the low conductivity of the second component.

Selon d'autres caractéristiques avantageuses de l'invention :

  • le ou chaque circuit d'alimentation en deuxième composant est maintenu au potentiel de la terre :
  • le ou chaque circuit d'alimentation en deuxième composant comprend un réservoir à piston ;
  • le ou chaque circuit d'alimentation en deuxième composant comprend une pompe à engrenages ;
  • le réservoir principal est un réservoir à piston ;
  • le rapport des surfaces des pistons du réservoir principal et du réservoir d'un circuit d'alimentation en deuxième composant est sensiblement égal au rapport des débits du premier composant et du deuxième composant ;
  • le ou chaque circuit d'alimentation en deuxième composant comprend un dispositif de vérification du débit d'alimentation en deuxième composant et/ou du débit total du produit de revêtement ; ce dispositif comprend avantageusement une restriction à l'écoulement du deuxième composant vers le projecteur et des moyens de détermination de la perte de charge à travers cette restriction ;
  • au moins un mélangeur est disposé en aval de la jonction entre un conduit provenant du réservoir principal et le ou chaque circuit d'alimentation en additif, ce mélangeur étant de préférence logé dans un porte-injecteur du projecteur ; ce mélangeur est avantageusement un mélangeur statique ;
  • le robot est relié à une source de haute-tension réglable, apte à être mise à zéro en dehors des périodes de projection du projecteur.
According to other advantageous features of the invention:
  • the or each second component supply circuit is maintained at the potential of the earth:
  • the or each second component feed circuit comprises a piston reservoir;
  • the or each second component supply circuit comprises a gear pump;
  • the main tank is a piston tank;
  • the ratio of the surfaces of the pistons of the main reservoir and the reservoir of a second component supply circuit is substantially equal to the ratio of the flow rates of the first component and the second component;
  • the or each second component feed circuit comprises a second component feed rate verification device and / or a total flow rate of the coating product; this device advantageously comprises a restriction on the flow of the second component to the projector and means for determining the pressure drop across this restriction;
  • at least one mixer is disposed downstream of the junction between a pipe coming from the main tank and the or each additive feed circuit, this mixer being preferably housed in a nozzle holder of the headlight; this mixer is advantageously a static mixer;
  • the robot is connected to an adjustable high-voltage source, able to be zeroed outside the projection periods of the projector.

Les caractéristiques et avantages de l'invention apparaîtront dans la description qui va suivre d'un mode de réalisation d'une installation de projection conforme à l'invention, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés dans lesquels :

  • la figure 1 est une représentation schématique d'une installation de projection conforme à l'invention en cours d'utilisation pour la projection d'un produit de revêtement multi-composant ;
  • la figure 2 est une vue analogue à la figure 1 lors du remplissage du réservoir contenant le premier composant du produit de revêtement multi-composant utilisé dans l'installation de la figure 1 ;
  • la figure 3 est un schéma de principe des circuits d'alimentation en composants correspondant au détail III à la figure 1 ;
  • la figure 4 est un schéma de principe partiellement en coupe axiale de parties de l'installation correspondant au détail IV à la figure 1.
The features and advantages of the invention will appear in the following description of an embodiment of a projection installation according to the invention, given solely by way of example and with reference to the appended drawings in which: :
  • the figure 1 is a schematic representation of a projection installation according to the invention in use for projecting a multi-component coating product;
  • the figure 2 is a view similar to the figure 1 when filling the tank containing the first component of the multi-component coating product used in the installation of the figure 1 ;
  • the figure 3 is a block diagram of the component supply circuits corresponding to detail III to figure 1 ;
  • the figure 4 is a schematic diagram partially in axial section of parts of the installation corresponding to detail IV at the figure 1 .

Dans l'installation représentée aux figures 1 et 2, un robot 1 est disposé à proximité d'un convoyeur 2 transportant des objets à revêtir, en l'occurrence des carrosseries 3 de véhicules automobiles. Le robot 1 est de type multi-axes et comprend un châssis 4, mobile sur un guide 5 s'étendant parallèlement à la direction de convoyage X-X'. Un bras 6 est supporté par le châssis 4 et comprend plusieurs segments 6a, 6b, 6c articulés les uns par rapport aux autres. Le châssis 4 est constitué de parties 4a et 4b articulées l'une par rapport à l'autre autour d'un axe Z-Z' sensiblement vertical.In the installation represented in figures 1 and 2 , a robot 1 is disposed near a conveyor 2 carrying objects to be coated, in this case bodies 3 motor vehicles. The robot 1 is of multi-axis type and comprises a frame 4, mobile on a guide 5 extending parallel to the conveying direction X-X '. An arm 6 is supported by the frame 4 and comprises a plurality of segments 6a, 6b, 6c hinged relative to each other. The frame 4 consists of parts 4a and 4b articulated with respect to each other about a substantially vertical axis ZZ '.

Le segment 6c du bras 6 supporte un ensemble comprenant un réservoir 7, un projecteur rotatif 8 et une platine 9 dans laquelle sont ménagés des conduits reliant le réservoir 7 au projecteur 8, l'un de ces conduits étant représenté sur les figures 1 et 2 avec la référence 72.The segment 6c of the arm 6 supports an assembly comprising a reservoir 7, a rotating projector 8 and a plate 9 in which are formed ducts connecting the reservoir 7 to the projector 8, one of these ducts being shown on the figures 1 and 2 with reference 72.

Le projecteur 8 est de type électrostatique et est relié à un générateur haute-tension réglable non représenté. Le générateur est mis à zéro en dehors des périodes de projection du projecteur 8.The projector 8 is of the electrostatic type and is connected to an adjustable high-voltage generator (not shown). The generator is set to zero outside the projection periods of the projector 8.

Le produit contenu dans le réservoir 7 est un premier composant d'un produit de revêtement multi-composant, par exemple une base hydrosoluble. Cette base est électriquement conductrice, c'est-à-dire présente une résistivité faible du même ordre de grandeur que celle de l'eau, incompatible avec une mise à la haute tension directe, inférieure à 1 Mohm.cm, de préférence inférieure à 1 kohm.cm.The product contained in the reservoir 7 is a first component of a multi-component coating product, for example a water-soluble base. This base is electrically conductive, that is to say has a low resistivity of the same order of magnitude as that of water, incompatible with a setting to high voltage direct, less than 1 Mohm.cm, preferably less than 1 kohm.cm.

Un second réservoir 10 est monté sur le robot 1, à proximité du segment 6c, et est relié au projecteur 8 par des conduits ménagés dans la platine 9, l'un de ces conduits étant représenté sur les figures 1 et 2 avec la référence 102. Ce réservoir 10 est destiné à contenir un deuxième composant, par exemple un additif électriquement isolant tel qu'un durcisseur ou un catalyseur. Le mélange de la base et de cet additif dans des proportions prédéterminées forme le produit de revêtement multi-composant à projeter.A second tank 10 is mounted on the robot 1, close to the segment 6c, and is connected to the projector 8 by ducts formed in the plate 9, one of these ducts being shown on the figures 1 and 2 with reference 102. This reservoir 10 is intended to contain a second component, for example an electrically insulating additive such as a hardener or a catalyst. The mixture of the base and this additive in predetermined proportions forms the multi-component coating product to be sprayed.

L'additif est électriquement isolant ou faiblement conducteur en ce sens qu'il a une résistivité supérieure à 10 Mohm.cm.The additive is electrically insulating or weakly conductive in that it has a resistivity greater than 10 Mohm.cm.

Dans la configuration de la figure 1, le projecteur 8 est utilisé pour projeter sur la carrosserie 3 du produit de revêtement multi-composant obtenu par mélange des composants provenant des réservoirs 7 et 10.In the configuration of the figure 1 , the projector 8 is used to project on the body 3 of the multi-component coating product obtained by mixing the components from the tanks 7 and 10.

Le réservoir 7 est pourvu sur sa surface externe d'un connecteur 71 destiné à coopérer avec un connecteur 11 prévu à poste fixe sur une cloison 12 de la cabine de revêtement C dans laquelle est installé le robot 1. Le connecteur 11 est relié par un conduit 111 à une unité 112 de changement de la base du produit de revêtement, ce qui permet d'alimenter le connecteur 11 en différents types de bases pour le produit de revêtement, selon la nature du produit à projeter sur la prochaine carrosserie 3 arrivant en regard du robot 1.The reservoir 7 is provided on its external surface with a connector 71 intended to cooperate with a connector 11 provided at a stationary position on a partition 12 of the coating booth C in which the robot 1 is installed. The connector 11 is connected by a leads 111 to a unit 112 for changing the base of the coating product, which allows to feed the connector 11 in different types of bases for the coating product, depending on the nature of the product to be projected on the next body 3 arriving in look of the robot 1.

Ainsi, lorsque le réservoir 7 est présenté en regard du connecteur 11, comme représenté à la figure 2, on obtient un remplissage du réservoir 7 en base électriquement conductrice du produit de revêtement.Thus, when the reservoir 7 is presented facing the connector 11, as shown in FIG. figure 2 a filling of the tank 7 is obtained in the electrically conductive base of the coating product.

Pour ce qui concerne l'alimentation du projecteur en base hydrosoluble, l'installation incorpore globalement l'enseignement technique de EP-A-0 274 322 .As far as the power supply of the water-soluble base projector is concerned, the installation generally incorporates the technical teaching of EP-A-0 274 322 .

Le réservoir 10 est relié par un conduit 101 à une source S d'additif, telle qu'un réservoir de contenance relativement importante. Le circuit d'alimentation de l'additif peut être porté à la haute tension ou à un potentiel flottant ou intermédiaire. En variante et comme réalisé dans l'exemple décrit, le réservoir 10 et le conduit 101 sont conçus de manière à ce que le circuit d'alimentation de l'additif est maintenu au potentiel de la terre, y compris pendant les phases de projection où le projecteur est alimenté en produit de revêtement et relié au générateur de haute-tension qui est activé.The reservoir 10 is connected by a conduit 101 to an additive source S, such as a reservoir of relatively large capacity. The feed circuit of the additive can be raised to high voltage or to a floating potential or intermediate. Alternatively and as realized in the example described, the tank 10 and the duct 101 are designed so that the supply circuit of the additive is maintained at the potential of the earth, including during the projection phases where the projector is supplied with coating material and connected to the high-voltage generator which is activated.

Le fait que l'additif est isolant ou faiblement conducteur permet que le circuit correspondant 101, 10, 102 soit porté à un potentiel électrique différent de son environnement. En particulier, la source S peut être à un potentiel différent de la partie du projecteur 8 portée à la haute tension.The fact that the additive is insulating or weakly conductive allows the corresponding circuit 101, 10, 102 to be brought to an electrical potential different from its environment. In particular, the source S may be at a different potential from the portion of the projector 8 brought to the high voltage.

Dans le cas où plusieurs additifs sont ajoutés à la base pour former le produit de revêtement multi-composant, un circuit d'alimentation est prévu pour chacun de ces additifs.In the case where several additives are added to the base to form the multi-component coating product, a feed circuit is provided for each of these additives.

Comme représenté à la figure 3, les réservoirs 7 et 10 sont des réservoirs à piston commandés par des moteurs électriques pas à pas M7 et M10. Le remplissage du réservoir 7 a lieu lorsque le connecteur 71 coopère avec le connecteur 11. Le remplissage du réservoir 10 est assuré en continu par le conduit 101. Deux vannes 73 et 103 jouent le rôle de vannes de coupure pour le remplissage des réservoirs 7 et 10.As represented in figure 3 tanks 7 and 10 are piston tanks controlled by electric stepper motors M 7 and M 10 . The filling of the tank 7 takes place when the connector 71 cooperates with the connector 11. The filling of the tank 10 is ensured continuously by the pipe 101. Two valves 73 and 103 act as shut-off valves for filling the tanks 7 and 10.

Dans la phase de projection du produit de revêtement multi-composant, chacun des réservoirs 7 et 10 injecte le composant correspondant vers le projecteur 8 à travers un conduit 78. Le conduit 78 a son origine à la jonction J entre le conduit 72 provenant du réservoir 7 et le conduit 102 provenant du réservoir 10. Le moteur M7 actionne le piston 75 du réservoir 7 de manière à injecter la base vers le conduit 78 et le projecteur 8, à travers le conduit 72. Simultanément le moteur M10 actionne le piston 105 du réservoir 10 pour injecter l'additif vers le conduit 78 et le projecteur 8, à travers le conduit 102. Deux vannes 77 et 107 sont prévues respectivement dans les conduits 72 et 102 et jouent le rôle de vannes de coupure pour l'injection des deux composants vers le conduit 78 et le projecteur 8.In the projecting phase of the multi-component coating product, each of the tanks 7 and 10 injects the corresponding component to the projector 8 through a conduit 78. The duct 78 has its origin at the junction J between the conduit 72 from the reservoir 7 and the conduit 102 from the reservoir 10. The motor M 7 actuates the piston 75 of the reservoir 7 so as to inject the base towards the conduit 78 and the projector 8, through the conduit 72. Simultaneously the motor M 10 actuates the piston 105 of the reservoir 10 to inject the additive to the conduit 78 and the projector 8, through the 102. Two valves 77 and 107 are respectively provided in the ducts 72 and 102 and act as cut-off valves for injecting the two components towards the duct 78 and the projector 8.

Ce dispositif utilisant deux réservoirs à piston permet de doser de manière maîtrisée les composants à mélanger. En particulier, le rapport des surfaces S75 du piston 75 et S105 du piston 105 est sensiblement égal au rapport de mélange de la base et de l'additif du produit de revêtement multi-composant, c'est-à-dire au rapport des débits volumiques de la base et de l'additif. La surface S75 du piston 75 du réservoir 7 contenant la base peut notamment être supérieure à la surface S105 du piston 105 du réservoir 10 contenant l'additif. Une telle différence de surfaces n'a pas été représentée sur la figure 3 dans un souci de simplicité. La vitesse de déplacement des pistons 75 et 105 peut également être ajustée de manière à obtenir un dosage optimal des composants.This device using two piston tanks makes it possible to control the components to be mixed in a controlled manner. In particular, the ratio of the surfaces S 75 of the piston 75 and S 105 of the piston 105 is substantially equal to the mixing ratio of the base and the additive of the multi-component coating product, that is to say to the ratio volume flow rates of the base and the additive. The surface S 75 of the piston 75 of the reservoir 7 containing the base may in particular be greater than the surface S 105 of the piston 105 of the reservoir 10 containing the additive. Such a difference in surfaces has not been represented on the figure 3 for the sake of simplicity. The speed of movement of the pistons 75 and 105 can also be adjusted to obtain an optimal dosage of the components.

De plus, une restriction 13 est prévue sur le conduit 102 pour contrôler le débit de l'additif et le débit total du produit de revêtement vers le projecteur 8. La mesure de la pression en amont et en aval de la restriction 13 au moyen de deux capteurs 15 et 16 permet de déterminer, au moyen d'une unité de calcul 17, la perte de charge dans la restriction 13 et donc de vérifier, si la viscosité de l'additif est connue, que la valeur du débit d'additif est correcte.In addition, a restriction 13 is provided on the conduit 102 to control the flow rate of the additive and the total flow rate of the coating product to the projector 8. The measurement of the pressure upstream and downstream of the restriction 13 by means of two sensors 15 and 16 make it possible to determine, by means of a calculation unit 17, the pressure drop in the restriction 13 and thus to check, if the viscosity of the additive is known, that the value of the additive flow is correct.

La mesure de pression réalisée par le capteur 16 permet également de déterminer la valeur de la perte de charge entre le conduit 102 et la sortie de l'injecteur 84 du projecteur 8, qui est à la pression atmosphérique. La viscosité du mélange étant connue, il est alors possible de vérifier la valeur du débit total du produit de revêtement. On peut ainsi, d'une part, régler ces débits en régime transitoire et, d'autre part, les contrôler en régime établi.The pressure measurement performed by the sensor 16 also makes it possible to determine the value of the pressure drop between the conduit 102 and the outlet of the injector 84 of the projector 8, which is at atmospheric pressure. Since the viscosity of the mixture is known, it is then possible to check the value of the total flow rate of the coating product. It is thus possible, on the one hand, to regulate these flows under transient conditions and, on the other hand, to control them under steady state conditions.

En variante, les débits peuvent être vérifiés sans avoir connaissance des viscosités des composants du mélange, pour autant que les capteurs 15 et 16 et l'unité 17 auront été préalablement étalonnés.Alternatively, the flow rates can be checked without knowing the viscosities of the components of the mixture, provided that the sensors 15 and 16 and the unit 17 have been previously calibrated.

Les éléments 13 à 17 peuvent être remplacés par tout type de débitmètre adapté. Dans ce cas, le capteur 16 peut être conservé pour permettre de vérifier le débit total du produit mélangé.The elements 13 to 17 can be replaced by any type of adapted flowmeter. In this case, the sensor 16 can be kept to allow checking the total flow of the mixed product.

La base et l'additif passent à travers la platine 9 et sont mélangés dans le projecteur 8 avant projection du produit multi-composant obtenu sur la carrosserie 3. Le mélange de la base et de l'additif est réalisé à l'aide d'au moins un mélangeur 14 disposé en aval de la jonction J et logé dans le porte injecteur 83 du projecteur 8. Plus précisément, la base et l'additif passent d'abord à travers le corps 81 du projecteur 8 puis sont dirigés dans une succession de mélangeurs statiques 14. Dans l'exemple décrit, et comme représenté par les flèchés F à la figure 4, la base et l'additif passent dans trois mélangeurs statiques 14 successifs. Les mélangeurs statiques 14 sont constitués d'une succession de grilles, dé chicanes et d'hélices enchevêtrées, de telle sorte qu'un mélange homogène de la base et de l'additif est assuré. Le mélange obtenu, qui correspond au produit de revêtement multi-composant à projeter, passe ensuite dans l'injecteur 84 et dans le bol 85 du projecteur 8. Le bol 85 est monté sur un rotor 86, représenté partiellement à la figure 4, de même que son capot de protection 87. Le produit de revêtement multi-composant est projeté sur la carrosserie 3 à partir du bol 85 tournant.The base and the additive pass through the plate 9 and are mixed in the projector 8 before projection of the multi-component product obtained on the bodywork 3. The mixture of the base and the additive is made using at least one mixer 14 disposed downstream of the junction J and housed in the injector door 83 of the projector 8. More specifically, the base and the additive pass firstly through the body 81 of the projector 8 and then are directed in a succession of static mixers 14. In the example described, and as represented by the arrows F at the figure 4 the base and the additive pass into three successive static mixers 14. The static mixers 14 consist of a succession of grids, baffles and entangled propellers, so that a homogeneous mixture of the base and the additive is ensured. The mixture obtained, which corresponds to the multi-component coating product to be sprayed, then passes into the injector 84 and into the bowl 85 of the projector 8. The bowl 85 is mounted on a rotor 86, partially shown in FIG. figure 4 , as well as its protective cover 87. The multi-component coating product is projected onto the body 3 from the rotating bowl 85.

L'installation décrite permet donc d'assurer, d'une part, une isolation électrique entre le projecteur 8 et le circuit 11 de distribution de base électriquement conductrice, et, d'autre part, le mélange optimal de la base et de l'additif constituant le produit à projeter. La mise en place d'au moins un mélangeur 14 dans le porte-injecteur 83 permet de limiter le nombre de pièces de l'installation dans lesquelles circule le produit mélangé. Ainsi, en cas d'incident, par exemple une erreur de dosage, seuls le porte-injecteur 83 et l'injecteur 84 sont à remplacer.The installation described thus makes it possible, on the one hand, to provide electrical insulation between the projector 8 and the electrically conductive base distribution circuit 11, and, on the other hand, the optimal mixture of the base and the additive constituting the product to be sprayed. The installation of at least one mixer 14 in the injector holder 83 makes it possible to limit the number of parts of the installation in which the mixed product circulates. Thus, in the event of an incident, for example a dosing error, only the injector holder 83 and the injector 84 are to be replaced.

Dans le mode de réalisation décrit, le circuit d'alimentation de l'additif comprend un réservoir à piston pour l'injection dé l'additif vers le projecteur 8. En variante, l'additif peut être injecté vers le projecteur 8 au moyen d'une pompe à engrenages.In the embodiment described, the supply circuit of the additive comprises a piston tank for injecting the additive to the projector 8. Alternatively, the additive can be injected to the projector 8 by means of a gear pump.

L'invention a été décrite avec un robot multi-axes. Elle est cependant applicable indépendamment du type du robot, pour autant qu'un réservoir d'un premier composant et au moins un circuit d'alimentation en deuxième composant sont embarqués sur une partie mobile du robot.The invention has been described with a multi-axis robot. However, it is applicable regardless of the type of robot, provided that a reservoir of a first component and at least a second component power circuit are embedded on a moving part of the robot.

Claims (11)

  1. An installation for spraying a multi-component coating material, said material comprising a first component that is electrically conductive and at least one second component that is electrically insulating or poorly conductive, characterized in that said installation comprises a main tank (7) carried by a moving portion (6) of a robot (1) also carrying an electrostatic sprayer (8), said tank being provided with means (71) for making a temporary connection with a circuit (11) for dispensing said first component, and being raised to a high voltage when said connection means are not connected, and secondly a feed circuit (10, 101, 102) for continuously feeding said or each second component, said main tank (7) and the or each feed circuit (10, 101, 102) being carried by said moving portion and being connected to feed said sprayer.
  2. An installation according to claim 1, characterized in that the or each second component feed circuit (10, 101, 102) is maintained at ground potential.
  3. An installation according to claim 1 or claim 2, characterized in that the or each second component feed circuit (10, 101, 102) comprises a piston tank (10).
  4. An installation according to claim 1 or claim 2, characterized in that the or each second component feed circuit (10, 101, 102) comprises a gear pump.
  5. An installation according to any preceding claim, characterized in that said main tank (7) is a piston tank.
  6. An installation according to claims 3 and 5, characterized in that the ratio of the areas (S75, S105) of the pistons (75, 105) of the main tank (7) and of the tank (10) of a second component feed circuit are substantially equal to the ratio of the flow rates for the first and second components.
  7. An installation according to any preceding claim, characterized in that the or each second component feed circuit (10, 101, 102) includes a device (13, 15-17) for verifying the flow rate of the second component and/or the total flow rate of coating material.
  8. An installation according to claim 7, characterized in that said device includes a constriction (13) for constricting the flow of the second component towards said sprayer (8), and means (15-17) for determining the head loss through said constriction.
  9. An installation according to any preceding claim, characterized in that at least one mixer (14) is disposed downstream from the junction (J) between a duct (72) coming from said main tank (7) and the or each second component feed circuit (10, 101, 102), said mixer being preferably housed in an injector carrier (83) of said sprayer (8).
  10. An installation according to claim 9, characterized in that said or each mixer (14) is a static mixer.
  11. An installation according to any preceding claim, characterized in that said robot (1) is connected to an adjustable high voltage source suitable for being switched off outside periods during which said sprayer (8) is spraying.
EP06808150A 2005-09-19 2006-09-18 Installation for spraying a multicomponent coating product Not-in-force EP1926560B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0509543A FR2890876B1 (en) 2005-09-19 2005-09-19 PROJECTION INSTALLATION OF MULTI-COMPONENT COATING PRODUCT
PCT/FR2006/002128 WO2007034058A1 (en) 2005-09-19 2006-09-18 Installation for spraying a multicomponent coating product

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EP1926560A1 EP1926560A1 (en) 2008-06-04
EP1926560B1 true EP1926560B1 (en) 2009-11-25

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EP (1) EP1926560B1 (en)
JP (1) JP5133247B2 (en)
CN (1) CN100553791C (en)
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DE (1) DE602006010722D1 (en)
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WO (1) WO2007034058A1 (en)

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WO2007034058A1 (en) 2007-03-29
JP2009508670A (en) 2009-03-05
ATE449647T1 (en) 2009-12-15
FR2890876A1 (en) 2007-03-23
JP5133247B2 (en) 2013-01-30
FR2890876B1 (en) 2007-11-30
EP1926560A1 (en) 2008-06-04
CN101267892A (en) 2008-09-17
US20080230003A1 (en) 2008-09-25
US8025026B2 (en) 2011-09-27
CN100553791C (en) 2009-10-28
DE602006010722D1 (en) 2010-01-07

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