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EP0520855B1 - Electrostatic painting installation for powder coating material - Google Patents

Electrostatic painting installation for powder coating material Download PDF

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Publication number
EP0520855B1
EP0520855B1 EP92401648A EP92401648A EP0520855B1 EP 0520855 B1 EP0520855 B1 EP 0520855B1 EP 92401648 A EP92401648 A EP 92401648A EP 92401648 A EP92401648 A EP 92401648A EP 0520855 B1 EP0520855 B1 EP 0520855B1
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EP
European Patent Office
Prior art keywords
powder
connection
reservoir
associated unit
installation
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
EP92401648A
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German (de)
French (fr)
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EP0520855A1 (en
Inventor
André Frene
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Sames SA
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Sames SA
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Publication of EP0520855B1 publication Critical patent/EP0520855B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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

Definitions

  • the invention relates to an installation for electrostatic spraying of powder coating product, in particular a thermosetting powder paint, it relates more particularly to an improvement allowing a relatively simple and rapid color change.
  • powder coating product in particular a thermosetting powder paint
  • Such an installation is known from document US-A-3,667,674.
  • a powder coating product installation generally comprises a cabin in which the objects to be covered move opposite a plurality of powder projectors.
  • electrostatic powder projectors for example of the order of twenty per cabin.
  • These projectors must therefore be connected to the same source or reservoir of powder. If the installation is intended for more or less frequent color changes, it is therefore necessary, each time, to clean the cabin, the projectors and all the supply ducts of these projectors before connecting them to a new one. another color powder source or reservoir.
  • the invention makes it possible to simplify these operations and to reduce the downtime at each color change, by allowing simple, effective, rapid and simultaneous cleaning of all the projectors and their powder supply circuits.
  • the invention therefore relates to an installation for electrostatic projection of powder coating product, comprising a plurality of powder projectors and several powder reservoirs each containing powder of specific color, characterized in that each reservoir is provided with '' a plurality of suction tubes, in that the connection ends of these tubes are all arranged side by side on a connection base of said tank, in that a connecting block is provided with suction devices powder each establishing communication between a duct connected to a projector or group of projectors and one of said suction tubes, in that said connection block is removable so that it can be mounted on a connection base of a chosen tank and in that said installation comprises in addition to an air blowing station provided with a connection base similar to that of a reservoir and comprising air ejection orifices arranged to be connected to said suction devices.
  • connection block connected to one of the tanks is quickly detached and connected to the blowing station where pressurized air is injected into all the powder supply conduits of all projectors simultaneously. After blowing, the connection block is mounted on the connection base of another reservoir containing the powder of the new chosen color.
  • connection block is advantageously provided with handles making it possible to move it from one connection base to another and it is preferably hung up by slings or the like to a load balancing system.
  • the installation shown in the drawings comprises several electrostatic powder projectors 11 installed on mobile equipment 12 moving, here vertically, on supports 13 in the form of columns. These supports are installed in a cabin not shown.
  • a single cabin can house a fairly large number of projectors, of the order of twenty, depending on the dimensions and complexity of the objects to be covered.
  • Each projector (or each group of a small number of projectors) is supplied with powder by a flexible conduit 14. All these conduits are grouped in a sheath 15 and connected to a connection block 18, constituting one of the elements of the invention and which will be described later.
  • the installation further comprises a gantry 20 placed in the immediate vicinity of the cabin and on which are installed several powder reservoirs 22.
  • Each reservoir here in the form of a rectangular parallelepiped, contains powder of a specific color and is connected to powder supply means not shown, by a flexible conduit 24, so that it can be replenished with powder.
  • Each reservoir 22 contains a plurality of suction tubes 26 (typically about twenty such tubes) placed side by side and immersed in the powder. This is normally maintained in the fluidized state, by injecting air into the tank. Connection ends 27 of these tubes pass through the front wall 28 of the tank so as to be side-by-side on a connection base 30 fixed to this front wall and intended to receive the connection block 18. These connection ends therefore flush through holes 27 has respective to the surface of the base connection 30.
  • connection block 18 is provided with powder suction devices 32 each establishing communication between a conduit 14 and a suction tube 26. These suction devices 32 are installed side by side on the connection block. More specifically, entry 34 of such a suction device is a conduit formed in the connection block 18 and which is placed facing the opening 27 has corresponding. O-rings 31, housed in annular grooves made on the surface of the connection block and surrounding the inlets 34, ensure a sealed connection between the suction tubes 26 and the suction devices 32.
  • the latter are here conventional venturi devices, supplied by compressed air supplied by respective distribution conduits 38, via individual injectors 39.
  • the flexible conduits 38 are grouped in a common sheath 40 connected to a cabinet 41 containing a set of valves control and pressure regulating means for adjusting the air injection, independently in all suction devices.
  • the outlet of each suction device is connected to a flexible conduit 14.
  • connection block 18 is removable and mobile. It can thus be mounted on the connection base 30 of any chosen tank.
  • each connection base is provided with two positioning elements 42, projecting from its surface while the connection block is provided with two corresponding holes 44.
  • connection block is provided with handles 46 so that it can be moved from one connection base to another. It is also provided with fastening fastening screws 47, capable of cooperating with tapped holes 48 made in the bases.
  • the connection block is hung up by slings 49 or the like to a load balancing system 50. The latter, visible in part in FIG.
  • the gantry 20 supports an air blowing station 56 provided with a connection base 57 similar to that of a tank and comprising air ejection orifices 58 arranged to be connected to the suction devices at venturi.
  • the inlet of each suction device is located opposite an air ejection orifice 58 when the connection block is mounted on the connection base 57 of the air blowing station 56
  • the latter is connected to a source of compressed air which is not shown, for example housed in the cabinet 41.
  • connection block 18 When you want to change the powder, stop spraying and detach the connection block from the tank on which it is mounted. The said connection block is then placed on the air blowing station 56 so that all the suction devices are simultaneously connected to the source of compressed air. All the conduits in which the powder circulates, the connection block and the projectors are thus quickly and simultaneously blown clean by blowing. After cleaning the cabin, it only remains to bring the connection block 18 against the front wall of another reservoir 22 containing a powder of another color and to connect said connection block to the base of this tank. The installation is then ready for operation again.

Landscapes

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

Description

L'invention se rapporte à une installation de projection électrostatique de produit de revêtement en poudre, notamment une peinture en poudre thermodurcissable, elle concerne plus particulièrement un perfectionnement permettant un changement de couleur relativement simple et rapide. Une telle installation est connue du document US-A-3 667 674.The invention relates to an installation for electrostatic spraying of powder coating product, in particular a thermosetting powder paint, it relates more particularly to an improvement allowing a relatively simple and rapid color change. Such an installation is known from document US-A-3,667,674.

Une installation de produit de revêtement en poudre comporte généralement une cabine dans laquelle les objets à recouvrir se déplacent en regard d'une pluralité de projecteurs de poudre. Selon la dimension et la complexité des objets, il peut être nécessaire d'utiliser un assez grand nombre de projecteurs électrostatiques de poudre, par exemple de l'ordre d'une vingtaine par cabine. Ces projecteurs doivent donc être connectés à une même source ou réservoir de poudre. Si l'installation est prévue pour des changements de couleur plus ou moins fréquents, il est donc nécessaire, à chaque fois, de nettoyer la cabine, les projecteurs et tous les conduits d'alimentation de ces projecteurs avant de connecter ces derniers à une nouvelle source ou réservoir de poudre d'une autre couleur.A powder coating product installation generally comprises a cabin in which the objects to be covered move opposite a plurality of powder projectors. Depending on the size and complexity of the objects, it may be necessary to use a fairly large number of electrostatic powder projectors, for example of the order of twenty per cabin. These projectors must therefore be connected to the same source or reservoir of powder. If the installation is intended for more or less frequent color changes, it is therefore necessary, each time, to clean the cabin, the projectors and all the supply ducts of these projectors before connecting them to a new one. another color powder source or reservoir.

L'invention permet de simplifier ces opérations et de réduire les temps morts à chaque changement de couleur, en permettant un nettoyage simple, efficace, rapide et simultané de tous les projecteurs et de leurs circuits d'alimentation en poudre.The invention makes it possible to simplify these operations and to reduce the downtime at each color change, by allowing simple, effective, rapid and simultaneous cleaning of all the projectors and their powder supply circuits.

Plus précisément, l'invention concerne donc une installation de projection électrostatique de produit de revêtement en poudre, comportant une pluralité de projecteurs de poudre et plusieurs réservoirs de poudre renfermant chacun de la poudre de couleur spécifique, caractérisée en ce que chaque réservoir est muni d'une pluralité de tubes d'aspiration, en ce que des extrémités de raccordement de ces tubes sont toutes agencées côte-à-côte sur une embase de connexion dudit réservoir, en ce qu'un bloc de liaison est muni de dispositifs d'aspiration de poudre établissant chacun une communication entre un conduit relié à un projecteur ou groupe de projecteurs et l'un desdits tubes d'aspiration, en ce que ledit bloc de liaison est amovible pour pouvoir être monté sur une embase de connexion d'un réservoir choisi et en ce que ladite installation comprend en outre une station de soufflage d'air munie d'une embase de connexion analogue à celle d'un réservoir et comportant des orifices d'éjection d'air disposés pour être raccordés auxdits dispositifs d'aspiration.More specifically, the invention therefore relates to an installation for electrostatic projection of powder coating product, comprising a plurality of powder projectors and several powder reservoirs each containing powder of specific color, characterized in that each reservoir is provided with '' a plurality of suction tubes, in that the connection ends of these tubes are all arranged side by side on a connection base of said tank, in that a connecting block is provided with suction devices powder each establishing communication between a duct connected to a projector or group of projectors and one of said suction tubes, in that said connection block is removable so that it can be mounted on a connection base of a chosen tank and in that said installation comprises in addition to an air blowing station provided with a connection base similar to that of a reservoir and comprising air ejection orifices arranged to be connected to said suction devices.

Ainsi, lors d'un changement de couleur, le bloc de liaison raccordé à l'un des réservoirs est rapidement détaché et connecté à la station de soufflage où de l'air sous pression est injecté dans tous les conduits d'alimentation en poudre de tous les projecteurs, simultanément. Après soufflage, le bloc de liaison est monté sur l'embase de connexion d'un autre réservoir contenant la poudre de la nouvelle couleur choisie.Thus, during a color change, the connection block connected to one of the tanks is quickly detached and connected to the blowing station where pressurized air is injected into all the powder supply conduits of all projectors simultaneously. After blowing, the connection block is mounted on the connection base of another reservoir containing the powder of the new chosen color.

Pour faciliter ces opérations, le bloc de liaison est avantageusement muni de poignées permettant de le déplacer d'une embase de connexion à une autre et il est de préférence raccroché par des élingues ou analogues à un système d'équilibrage de charge.To facilitate these operations, the connection block is advantageously provided with handles making it possible to move it from one connection base to another and it is preferably hung up by slings or the like to a load balancing system.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre d'une installation conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels:

  • la figure 1 est une vue schématique en perspective de l'installation;
  • la figure 2 est une vue de détail représentant le bloc de liaison de face;
  • la figure 3 est une vue selon une coupe III-III de la figure 2, représentant le bloc de liaison monté sur l'embase de connexion d'un réservoir de poudre, ce dernier étant également représenté schématiquement en coupe;
  • la figure 4 est une coupe IV-IV de la figure 2; et
  • la figure 5 est une coupe V-V de la figure 2.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of an installation in accordance with its principle, given solely by way of example and made with reference to the accompanying drawings wherein:
  • Figure 1 is a schematic perspective view of the installation;
  • Figure 2 is a detail view showing the front connection block;
  • Figure 3 is a view in section III-III of Figure 2, showing the connecting block mounted on the connection base of a powder reservoir, the latter also being shown schematically in section;
  • Figure 4 is a section IV-IV of Figure 2; and
  • FIG. 5 is a section VV of FIG. 2.

L'installation représentée sur les dessins comporte plusieurs projecteurs électrostatiques de poudre 11 installés sur des équipages mobiles 12 se déplaçant, ici verticalement, sur des supports 13 en forme de colonnes. Ces supports sont installés dans une cabine non représentée. Une même cabine peut abriter un assez grand nombre de projecteurs, de l'ordre d'une vingtaine, selon les dimensions et la complexité des objets à recouvrir. Chaque projecteur (ou chaque groupe d'un petit nombre de projecteurs) est alimenté en poudre par un conduit souple 14. Tous ces conduits sont regroupés dans une gaine 15 et raccordés à un bloc de liaison 18, constituant l'un des éléments de l'invention et qui sera décrit plus loin.The installation shown in the drawings comprises several electrostatic powder projectors 11 installed on mobile equipment 12 moving, here vertically, on supports 13 in the form of columns. These supports are installed in a cabin not shown. A single cabin can house a fairly large number of projectors, of the order of twenty, depending on the dimensions and complexity of the objects to be covered. Each projector (or each group of a small number of projectors) is supplied with powder by a flexible conduit 14. All these conduits are grouped in a sheath 15 and connected to a connection block 18, constituting one of the elements of the invention and which will be described later.

L'installation comporte en outre un portique 20 placé à proximité immédiate de la cabine et sur lequel sont installés plusieurs réservoirs de poudre 22. Chaque réservoir, ici en forme de parallélépipède rectangle, renferme de la poudre d'une couleur spécifique et est relié à des moyens d'alimentation de poudre non représentés, par un conduit souple 24, de façon à pouvoir être réapprovisionné en poudre. Chaque réservoir 22 renferme une pluralité de tubes d'aspiration 26 (typiquement une vingtaine de tels tubes) placés côte-à-côte et plongeant dans la poudre. Celle-ci est normalement maintenue à l'état fluidisé, par injection d'air dans le réservoir. Des extrémités de raccordement 27 de ces tubes traversent la paroi frontale 28 du réservoir de façon à se présenter côte-à-côte sur une embase de connexion 30 fixée à cette paroi frontale et destinée à recevoir le bloc de liaison 18. Ces extrémités de raccordement affleurent donc par des orifices 27a respectifs à la surface de l'embase de connexion 30.The installation further comprises a gantry 20 placed in the immediate vicinity of the cabin and on which are installed several powder reservoirs 22. Each reservoir, here in the form of a rectangular parallelepiped, contains powder of a specific color and is connected to powder supply means not shown, by a flexible conduit 24, so that it can be replenished with powder. Each reservoir 22 contains a plurality of suction tubes 26 (typically about twenty such tubes) placed side by side and immersed in the powder. This is normally maintained in the fluidized state, by injecting air into the tank. Connection ends 27 of these tubes pass through the front wall 28 of the tank so as to be side-by-side on a connection base 30 fixed to this front wall and intended to receive the connection block 18. These connection ends therefore flush through holes 27 has respective to the surface of the base connection 30.

Le bloc de liaison 18 est muni de dispositifs d'aspiration de poudre 32 établissant chacun une communication entre un conduit 14 et un tube d'aspiration 26. Ces dispositifs d'aspiration 32 sont installés côte-à-côte sur le bloc de liaison. Plus précisément, l'entrée 34 d'un tel dispositif d'aspiration est un conduit pratiqué dans le bloc de liaison 18 et venant se placer en regard de l'orifice 27a correspondant. Des joints toriques 31, logés dans des gorges annulaires pratiquées à la surface du bloc de liaison et entourant les entrées 34, permettent d'assurer un raccordement étanche entre les tubes d'aspiration 26 et les dispositifs d'aspiration 32. Ces derniers sont ici des dispositifs à venturi classique, alimentés par de l'air comprimé fourni par des conduits de distribution 38 respectifs, via des injecteurs individuels 39. Les conduits 38 souples, sont regroupés dans une gaine commune 40 reliée à une armoire 41 renfermant un ensemble de vannes de commande et de moyens de régulation de pression permettant de régler l'injection d'air, indépendamment dans tous les dispositifs d'aspiration. La sortie de chaque dispositif d'aspiration est connectée à un conduit souple 14.The connection block 18 is provided with powder suction devices 32 each establishing communication between a conduit 14 and a suction tube 26. These suction devices 32 are installed side by side on the connection block. More specifically, entry 34 of such a suction device is a conduit formed in the connection block 18 and which is placed facing the opening 27 has corresponding. O-rings 31, housed in annular grooves made on the surface of the connection block and surrounding the inlets 34, ensure a sealed connection between the suction tubes 26 and the suction devices 32. The latter are here conventional venturi devices, supplied by compressed air supplied by respective distribution conduits 38, via individual injectors 39. The flexible conduits 38 are grouped in a common sheath 40 connected to a cabinet 41 containing a set of valves control and pressure regulating means for adjusting the air injection, independently in all suction devices. The outlet of each suction device is connected to a flexible conduit 14.

Le bloc de liaison 18 est amovible et mobile. Il peut ainsi être monté sur l'embase de connexion 30 de n'importe quel réservoir choisi. Pour ce faire, chaque embase de connexion est munie de deux éléments de positionnement 42, faisant saillie de sa surface tandis que le bloc de liaison est muni de deux trous 44 correspondants. En outre, le bloc de liaison est muni de poignées 46 pour pouvoir être déplacé d'une embase de connexion à une autre. Il est en outre muni de vis de fixation 47, à actionnement rapide, susceptible de coopérer avec des trous taraudés 48 pratiqués dans les embases. Enfin, le bloc de liaison est raccroché par des élingues 49 ou analogues à un système d'équilibrage de charge 50. Ce dernier, visible en partie sur la figure 1, comporte un chariot 51 déplaçable horizontalement à la partie supérieure du portique et muni de deux poulies 52 autour desquelles s'enroulent les élingues 49, ces dernières sont reliées à un système de contrepoids (non visible sur le dessin) ou à tout agencement d'équilibrage analogue.The connecting block 18 is removable and mobile. It can thus be mounted on the connection base 30 of any chosen tank. To do this, each connection base is provided with two positioning elements 42, projecting from its surface while the connection block is provided with two corresponding holes 44. In addition, the connection block is provided with handles 46 so that it can be moved from one connection base to another. It is also provided with fastening fastening screws 47, capable of cooperating with tapped holes 48 made in the bases. Finally, the connection block is hung up by slings 49 or the like to a load balancing system 50. The latter, visible in part in FIG. 1, comprises a carriage 51 movable horizontally at the top of the gantry and provided with two pulleys 52 around which the slings 49 are wound, the latter are connected to a counterweight system (not visible in the drawing) or to any similar balancing arrangement.

Enfin, le portique 20 supporte une station de soufflage d'air 56 munie d'une embase de connexion 57 analogue à celle d'un réservoir et comportant des orifices d'éjection d'air 58 disposés pour être raccordés aux dispositifs d'aspiration à venturi. Autrement dit, l'entrée de chaque dispositif d'aspiration se trouve en regard d'un orifice d'éjection d'air 58 lorsque le bloc de liaison est monté sur l'embase de connexion 57 de la station de soufflage d'air 56. Cette dernière est reliée à une source d'air comprimé non représentée, par exemple logée dans l'armoire 41.Finally, the gantry 20 supports an air blowing station 56 provided with a connection base 57 similar to that of a tank and comprising air ejection orifices 58 arranged to be connected to the suction devices at venturi. In other words, the inlet of each suction device is located opposite an air ejection orifice 58 when the connection block is mounted on the connection base 57 of the air blowing station 56 The latter is connected to a source of compressed air which is not shown, for example housed in the cabinet 41.

Le fonctionnement est des plus simples et découle avec évidence de la description qui précède. Lorsqu'on désire changer de poudre, on arrête la projection et on détache le bloc de liaison du réservoir sur lequel il est monté. On vient ensuite placer ledit bloc de liaison sur la station de soufflage d'air 56 de sorte que tous les dispositifs d'aspiration se trouvent simultanément connectés à la source d'air comprimé. On nettoie ainsi rapidement et simultanément par soufflage, tous les conduits dans lesquels circule la poudre, le bloc de liaison et les projecteurs. Après nettoyage de la cabine, il ne reste plus qu'à amener le bloc de liaison 18 contre la paroi frontale d'un autre réservoir 22 contenant une poudre d'une autre couleur et à connecter ledit bloc de liaison à l'embase de ce réservoir. L'installation est alors à nouveau prête à fonctionner.The operation is very simple and follows clearly from the above description. When you want to change the powder, stop spraying and detach the connection block from the tank on which it is mounted. The said connection block is then placed on the air blowing station 56 so that all the suction devices are simultaneously connected to the source of compressed air. All the conduits in which the powder circulates, the connection block and the projectors are thus quickly and simultaneously blown clean by blowing. After cleaning the cabin, it only remains to bring the connection block 18 against the front wall of another reservoir 22 containing a powder of another color and to connect said connection block to the base of this tank. The installation is then ready for operation again.

Claims (5)

  1. An installation for the electrostatic discharge of a powder coating product, comprising a plurality of powder dischargers (11) and a plurality of powder reservoirs (22), each containing powder of a specific colour, characterised in that each reservoir is provided with a plurality of suction tubes (26), in that ends for connection of these tubes are all arranged side by side on a connection seating (30) of said reservoir, in that an associated unit (18) is provided with powder suction devices (32), each of which sets up a communication between a conduit (14) connected to a discharger or group of dischargers and one of said suction tubes (26), in that said associated unit (18) is detachable so that it is able to be mounted to a connection seating (30) of a selected reservoir, and in that said installation further comprises an air-blowing station (56) provided with a connection seating (57) similar to that of a reservoir, and comprising air ejection orifices (58) arranged in such a way that they are connected to said suction devices (32).
  2. A discharge installation according to Claim 1, characterised in that said associated unit (18) is provided with handles (46) so that it can be moved from one connection seating to another.
  3. A discharge installation according to Claim 1 or 2, characterised in that said associated unit (18) is hung by means of slings (49), or the like, from a load balancing system (50).
  4. A discharge installation according to Claim 2 or Claim 3, characterised in that each connection seating (30) is provided with positioning elements (42) projecting from its surface and in that said associated unit (18) is provided with corresponding holes (44).
  5. A discharge installation according to Claim 3, characterised in that said associated unit (18) is provided with fixing screws (47) capable of cooperating with threaded holes (48) provided in the connection seats (30).
EP92401648A 1991-06-24 1992-06-15 Electrostatic painting installation for powder coating material Expired - Lifetime EP0520855B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9107713A FR2677900B1 (en) 1991-06-24 1991-06-24 INSTALLATION FOR ELECTROSTATIC SPRAYING OF POWDER COATING PRODUCT.
FR9107713 1991-06-24

Publications (2)

Publication Number Publication Date
EP0520855A1 EP0520855A1 (en) 1992-12-30
EP0520855B1 true EP0520855B1 (en) 1995-01-18

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US (1) US5215261A (en)
EP (1) EP0520855B1 (en)
JP (1) JPH05184980A (en)
DE (1) DE69201220T2 (en)
FR (1) FR2677900B1 (en)

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Also Published As

Publication number Publication date
FR2677900B1 (en) 1993-10-08
JPH05184980A (en) 1993-07-27
DE69201220T2 (en) 1995-05-24
US5215261A (en) 1993-06-01
DE69201220D1 (en) 1995-03-02
FR2677900A1 (en) 1992-12-24
EP0520855A1 (en) 1992-12-30

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