EP0818245A1 - Triboelectric spray gun, installation for spraying coating products and method for controlling such a gun - Google Patents

Triboelectric spray gun, installation for spraying coating products and method for controlling such a gun Download PDF

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Publication number
EP0818245A1
EP0818245A1 EP97420104A EP97420104A EP0818245A1 EP 0818245 A1 EP0818245 A1 EP 0818245A1 EP 97420104 A EP97420104 A EP 97420104A EP 97420104 A EP97420104 A EP 97420104A EP 0818245 A1 EP0818245 A1 EP 0818245A1
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EP
European Patent Office
Prior art keywords
air
projector
coating product
channel
triboelectric
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Granted
Application number
EP97420104A
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German (de)
French (fr)
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EP0818245B1 (en
Inventor
José Rodrigues
Daniel Belmain
Thierry Barlet
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Sames Kremlin SAS
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Sames SA
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Publication of EP0818245A1 publication Critical patent/EP0818245A1/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
    • 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
    • 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
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means

Definitions

  • the invention relates to a triboelectric projector of powder coating product, to a control process of such a projector and to a projection installation of coating product comprising such a projector.
  • a triboelectric coating product projector powder is a projector in which the electrostatic charge of the coating product is obtained by contact rubbing particles of the coating product against one or more several surfaces of insulating material arranged along their trajectory.
  • a projector of this type generally includes a coating product loading channel and is supplied from a coating material source such that, for example, a fluidized powder reservoir, through a supply duct in which a mixture of air circulates and coating product. It is known, for example from the request EP-A1-O 627 265, to provide an additional air supply in the spotlight near the arrival of the duct supply of air mixture and coating product.
  • the air is injected substantially perpendicular to the main axis of the projector barrel, at right angles to the arrival of the supply duct for air and product mixture coating.
  • This generates turbulence in the air mixture and coating product which cause phenomena complex. These phenomena influence the triboelectric charge obtained.
  • this turbulence creates wear of the component parts of the projector at room level air mixture and coating product intake, so that projector maintenance operations should be scheduled at regular intervals.
  • the invention solves all of these problems and proposes a triboelectric spotlight in which the triboelectric charge obtained can be precisely controlled thanks to the flow of dilution and / or acceleration air injected into the headlamp and in which wear phenomena are reduced compared to the prior art.
  • the invention relates to a projector triboelectric powder coating product comprising a coating product loading channel, a conduit supply connecting a coating product source said projector, a mixture of air and coating product circulating in said conduit, a dilution air injector and / or acceleration of said mixture of air and product coating, characterized in that the outlet orifice of said injector is disposed in the path of said mixture of air and coating product in an interior chamber of said projector, downstream of the arrival of said conduit in said projector and upstream of the input of said charge channel.
  • the incorporation of the dilution air and / or acceleration in the mixture of air and product coating leading to the arrival of the supply duct takes place efficiently and without turbulence likely to cause premature wear of parts projectors.
  • the triboelectric charge can be controlled using the dilution air flow and / or acceleration delivered through the injector to the air mixture and coating product.
  • the outlet of the injector is arranged substantially on the axis of symmetry of the charge channel, so that the air jet from dilution and / or acceleration is directed directly and symmetrically in the load channel. Thanks to this aspect of the invention we could show that the triboelectric charge of the powder forming coating material can be ordered thanks to the injector regardless of the air flow used in a Venturi pump connected upstream of the duct feed.
  • the load channel is formed by an external tube and a central core of electrically insulating material, the tube external being provided on its external face with an electrically layer conductive earthed through a device current measurement. Thanks to this aspect of the invention, it is possible to measure the triboelectric charge obtained, this being proportional to the current detected by the device measured.
  • the projector comprises means of controlling the instantaneous flow of air injected by the injector, these control means being controlled from the value detected by the current measuring device.
  • the supply duct for air and product mixture coating opens axially into the projector, which allows to further limit the turbulence phenomenon and therefore wear of the projector.
  • the invention also relates to a projection installation coating product comprising a headlamp conforming to the invention.
  • the invention finally relates to a method for controlling a triboelectric projector which can be used with the projector of the invention.
  • This process is characterized in that that it consists in measuring the load obtained in the channel charge and control the instantaneous air flow injected by the injector at this charge obtained in the charging channel.
  • the instantaneous air flow injected is maintained at an optimal value depending on the triboelectric charge to be obtained.
  • the process of the invention further consists in measuring the value of the return current at the earth of a conductive element arranged in contact with a component of the load channel.
  • This aspect of the process of the invention is a practical and simple alternative for the load measurement obtained in the load channel.
  • a triboelectric projector 1 of product of powder coating is fed from a reservoir 2 of powder coating product through a supply line 3 which can be flexible.
  • the powder in the tank 2 is suspended by a flow of air delivered by a controlled source 4 through a pipe 5 and passing through a porous plate 6.
  • a dip tube 7 is supported by a tab 8 above the tank 2 so that its end inferior enters the powder in suspension.
  • a pump at Venturi 9 mounted at the upper end of the tube 7 is supplied by the controlled source 4 through a pipe 10.
  • the air injected through the pipe 10 into the Venturi pump 9 sucks the powder suspended in tube 7 and injects it into the supply duct 3.
  • the projector 1 is thus supplied with a mixture of air and coating material.
  • Pipe 11 connects the controlled source 4 to the projector 1, the structure of which appears more clearly in Figure 2.
  • the pipe 11 allows supply the projector 1 with dilution and / or acceleration air of the mixture of air and coating product which circulates in conduit 3.
  • the headlamp 1 essentially consists of a load channel 12 defined between an external tube 13 and a central core 14 formed by a tube 14 a and two plugs 14 b and 14 c , of conical outer shape, able to be partially fitted into the ends of the tube 14 a .
  • Each plug 14 b and 14 c carries two O-rings 14 d whose function is to immobilize it inside the tube 14 a .
  • the projector also includes a body 16 provided with a threaded orifice 16 a inside which can be screwed a barrel 17 enveloping the whole of the structure forming the load channel 12.
  • a spray nozzle 18 whose outlet section, single or multiple, is chosen according to the shape of the jet of air-powder mixture desired.
  • Two rings 19 and 20 are respectively mounted at the upstream end and at the downstream end of the load tube 12 so as to immobilize the central core 14 inside the body 16 and the barrel 17, this making it possible to create the channel 12 between the inner surface of the outer tube 13 and the outer surface of the inner tube 14 a .
  • the inlet of the load channel 12 is defined by orifices 19 a drilled in the ring 19 through which the mixture of air and coating product circulates.
  • a mixture of inner chamber 21 is formed upstream of the input of the load channel in a nozzle 22 fitted in a central hole 16b of the body 16.
  • the hub 22 carries on its outer surface two O-ring 22 is intended to immobilize it inside the orifice 16 b .
  • the supply duct 3 is connected to the end piece 22 by means of a connector 23 and opens axially into the chamber 21, that is to say in the direction of the axis of symmetry XX ′ of the load channel which is the main axis of the projector.
  • the pipe 11 is connected to the interior of the chamber 21 by means of an elbow fitting 24 mounted on an injector 25 whose outlet orifice 25 a is disposed in the chamber 21 on the path of the mixture of air and coating product in the projector 1 downstream of the arrival of the conduit 3 in the chamber 21 and upstream of the inlet 19 a of the charge channel 12.
  • the orifice 25 a is disposed substantially on the axis XX 'so that the air injected through the injector 25 is directed towards the charge channel in a parallel direction and in the same direction than that of the mixture of air and coating product entering the chamber 21 through the connector 23.
  • the turbulence generated in the chamber 21 is minimal and the wear of the nozzle 22 is low over time, this which reduces the operating cost of the triboelectric projector of the invention compared to the devices of the prior art, because the connector 23 which constitutes the inlet or outlet of the supply channel 3 and the orifice 25 has of the injector 25 are arranged along the axis XX '.
  • the mixture of air and coating product entering the chamber 21 via the connector 23 strikes the rear of the injector 25, which has the effect of distributing the mixture of air and coating product in the chamber 21 and around the plug 14 b .
  • the air injected through the orifice 25 a has a flow rate which can be controlled by the source 4 independently of the air flow rate injected into the Venturi pump 9, so that the speed of the air mixture and of the coating product in the channel 12 can be controlled by the source 4 through the pipe 11 independently of the flow rate of powder sucked by the pump 9.
  • This speed of the mixture in the channel 12 is linked to the triboelectric charge obtained and one was able to show experimentally that, thanks to the invention, the triboelectric charge obtained is substantially proportional to the air flow injected by the injector 25. This therefore makes it possible to control the charge obtained in the device.
  • a conductive fiber tube carbon 26 is housed in the barrel 17 around the outer tube 13 in contact with it over most of its length.
  • the tube 26 therefore appears as a drain of charges electrostatic transmitted to the outer tube 13 by the particles powder.
  • the tube 26 bears against a metal screw 27, the rod of which is connected to earth by an electric cable 28.
  • an electric current flows through the tube 26 in direction of mass.
  • the end of the cable 28 is welded to a washer 29 held in position on the rod of the screw 27 with a button 30.
  • a current measuring device, such as an ammeter, 31 is arranged on the cable 28.
  • the value of the current measured by the ammeter 31 is proportional to the triboelectric charge obtained in channel 12 and can therefore be considered as representative of this charge.
  • the value of current detected by ammeter 31 is transmitted as input variable to a control unit 32 formed, by example, by a programmable controller or a microcomputer, which is a means of controlling the controlled source 4. More specifically, when a triboelectric charge value is desired, this is supplied to unit 32 as a value setpoint by an input device such as a keyboard 33. This value is associated, experimentally or by calculation, a current setpoint in the cable 28.
  • the value of the current in the cable 28 is in permanence provided to the automaton or to the microcomputer 32 and this controls source 4 so that if the value of current measured by ammeter 31 is less than the value the flow rate in the pipe 11 is increased, that is to say that the acceleration and / or dilution air flow injected through injector 25 is increased. If on the contrary the value of the current measured by the ammeter 31 is greater at the set value, the control means 32 controls source 4 so that the flow in the pipe 11 be reduced.
  • the air flow injected by the injector 25 is controlled, by means of control 32, by a loop regulator whose regulating variable is the detected value by the current measurement device constituted by the ammeter 31.
  • a process of control of headlamp 1 characterized in that it consists of measure the charge obtained in charge channel 12 and at using the PLC or computer 32 to control the flow instantaneous air injected by the source 4 into the pipe 11 to through the injector 25 to the charge obtained in the channel 12.
  • This method further includes measuring the value of the return to earth of the conductive element 26, which is arranged in contact with the tube 13, and to use this value as a variable representative of the load obtained in the channel.

Landscapes

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

Abstract

Air (3), carrying powder particles picked up by venturi action from an air-agitated reservoir, is diluted and/or accelerated on entry (21) by air injected via a central nozzle (25a), directed downstream. The stream then enters the annular passage (12) between concentric inner (14) and outer (13) tubes of insulating material. The former, plugged by conical entry (14b) and exit (14c) fairings, is supported by perforated spacer rings (19, 20). The tribo-electric charge, proportional to the injected control air-flow (25) is measured by the current collected by a conducting carbon-fibre tube (26) close-fitting over the outer insulated tube (13) and passed to earth (27, 28) via an external control unit, automatically adjusting the injected air-flow. The charged air-stream is finally projected through the end nozzle (18).

Description

L'invention a trait à un projecteur triboélectrique de produit de revêtement pulvérulent, à un procédé de commande d'un tel projecteur et à une installation de projection de produit de revêtement comprenant un tel projecteur.The invention relates to a triboelectric projector of powder coating product, to a control process of such a projector and to a projection installation of coating product comprising such a projector.

Un projecteur triboélectrique de produit de revêtement pulvérulent est un projecteur dans lequel la charge électrostatique du produit de revêtement est obtenue par contact frottant des particules du produit de revêtement contre une ou plusieurs surfaces en matériau isolant disposées le long de leur trajectoire. Un projecteur de ce type comprend généralement un canal de charge du produit de revêtement et est alimenté à partir d'une source de produit de revêtement telle que, par exemple, un réservoir de poudre fluidisée, à travers un conduit d'alimentation dans lequel circule un mélange d'air et de produit de revêtement. Il est connu, par exemple de la demande EP-A1-O 627 265, de prévoir une arrivée d'air supplémentaire dans le projecteur à proximité de l'arrivée du conduit d'alimentation en mélange d'air et de produit de revêtement.A triboelectric coating product projector powder is a projector in which the electrostatic charge of the coating product is obtained by contact rubbing particles of the coating product against one or more several surfaces of insulating material arranged along their trajectory. A projector of this type generally includes a coating product loading channel and is supplied from a coating material source such that, for example, a fluidized powder reservoir, through a supply duct in which a mixture of air circulates and coating product. It is known, for example from the request EP-A1-O 627 265, to provide an additional air supply in the spotlight near the arrival of the duct supply of air mixture and coating product.

Dans les dispositifs connus de l'art antérieur, un problème essentiel réside dans le fait qu'il n'est pas possible de contrôler la charge électrostatique obtenue par frottement au moyen d'un paramètre simple.In the known devices of the prior art, a essential problem is that it is not possible to control the electrostatic charge obtained by friction using a simple parameter.

En effet, dans le dispositif de EP-A1-0 627 265, l'air est injecté sensiblement perpendiculairement à l'axe principal du canon du projecteur, à angle droit par rapport à l'arrivée du conduit d'alimentation en mélange d'air et de produit de revêtement. Ceci génère des turbulences dans le mélange d'air et de produit de revêtement qui entraínent des phénomènes complexes. Ces phénomènes influent sur la charge triboélectrique obtenue. En outre, ces turbulences créent une usure des pièces constitutives du projecteur au niveau de la chambre d'admission du mélange d'air et de produit de revêtement, de sorte que des opérations de maintenance du projecteur doivent être prévues à intervalles réguliers.In fact, in the device of EP-A1-0 627 265, the air is injected substantially perpendicular to the main axis of the projector barrel, at right angles to the arrival of the supply duct for air and product mixture coating. This generates turbulence in the air mixture and coating product which cause phenomena complex. These phenomena influence the triboelectric charge obtained. In addition, this turbulence creates wear of the component parts of the projector at room level air mixture and coating product intake, so that projector maintenance operations should be scheduled at regular intervals.

L'invention résoud l'ensemble de ces problèmes et propose un projecteur triboélectrique dans lequel la charge triboélectrique obtenue peut être commandée de façon précise grâce au débit d'air de dilution et/ou d'accélération injecté dans le projecteur et dans lequel les phénomènes d'usure sont réduits par rapport à l'art antérieur.The invention solves all of these problems and proposes a triboelectric spotlight in which the triboelectric charge obtained can be precisely controlled thanks to the flow of dilution and / or acceleration air injected into the headlamp and in which wear phenomena are reduced compared to the prior art.

Dans cet esprit, l'invention concerne un projecteur triboélectrique de produit de revêtement pulvérulent comprenant un canal de charge de produit de revêtement, un conduit d'alimentation reliant une source de produit de revêtement audit projecteur, un mélange d'air et de produit de revêtement circulant dans ledit conduit, un injecteur d'air de dilution et/ou d'accélération dudit mélange d'air et de produit de revêtement, caractérisé en ce que l'orifice de sortie dudit injecteur est disposé sur le trajet dudit mélange d'air et de produit de revêtement dans une chambre intérieure dudit projecteur, en aval de l'arrivée dudit conduit dans ledit projecteur et en amont de l'entrée dudit canal de charge.In this spirit, the invention relates to a projector triboelectric powder coating product comprising a coating product loading channel, a conduit supply connecting a coating product source said projector, a mixture of air and coating product circulating in said conduit, a dilution air injector and / or acceleration of said mixture of air and product coating, characterized in that the outlet orifice of said injector is disposed in the path of said mixture of air and coating product in an interior chamber of said projector, downstream of the arrival of said conduit in said projector and upstream of the input of said charge channel.

Grâce à l'invention, l'incorporation de l'air de dilution et/ou d'accélération dans le mélange d'air et de produit de revêtement débouchant par l'arrivée du conduit d'alimentation a lieu de façon efficace et sans phénomène de turbulence susceptible de générer une usure prématurée des parties constitutives des projecteurs. De plus, la charge triboélectrique peut être commandée grâce au débit d'air de dilution et/ou d'accélération délivré à travers l'injecteur au mélange d'air et de produit de revêtement.Thanks to the invention, the incorporation of the dilution air and / or acceleration in the mixture of air and product coating leading to the arrival of the supply duct takes place efficiently and without turbulence likely to cause premature wear of parts projectors. In addition, the triboelectric charge can be controlled using the dilution air flow and / or acceleration delivered through the injector to the air mixture and coating product.

Selon un premier aspect avantageux de l'invention, la sortie de l'injecteur est disposée sensiblement sur l'axe de symétrie du canal de charge, de sorte que le jet d'air de dilution et/ou d'accélération est dirigé directement et symétriquement dans le canal de charge. Grâce à cet aspect de l'invention on a pu montrer que la charge triboélectrique de la poudre formant le matériau de revêtement peut être commandée grâce à l'injecteur et ce, indépendamment du débit d'air utilisé dans une pompe à Venturi branchée en amont du conduit d'alimentation.According to a first advantageous aspect of the invention, the outlet of the injector is arranged substantially on the axis of symmetry of the charge channel, so that the air jet from dilution and / or acceleration is directed directly and symmetrically in the load channel. Thanks to this aspect of the invention we could show that the triboelectric charge of the powder forming coating material can be ordered thanks to the injector regardless of the air flow used in a Venturi pump connected upstream of the duct feed.

Selon un autre aspect avantageux de l'invention, on peut prévoir que le canal de charge est formé d'un tube externe et d'un noyau central en matériau électriquement isolant, le tube externe étant muni sur sa face externe d'une couche électriquement conductrice reliée à la terre à travers un dispositif de mesure de courant. Grâce à cet aspect de l'invention, il est possible de mesurer la charge triboélectrique obtenue, celle-ci étant proportionnelle au courant détecté par le dispositif de mesure.According to another advantageous aspect of the invention, it is possible to provide that the load channel is formed by an external tube and a central core of electrically insulating material, the tube external being provided on its external face with an electrically layer conductive earthed through a device current measurement. Thanks to this aspect of the invention, it is possible to measure the triboelectric charge obtained, this being proportional to the current detected by the device measured.

On peut en outre prévoir que le projecteur comprend des moyens de contrôle du débit instantané d'air injecté par l'injecteur, ces moyens de contrôle étant commandés à partir de la valeur détectée par le dispositif de mesure de courant.It can also be provided that the projector comprises means of controlling the instantaneous flow of air injected by the injector, these control means being controlled from the value detected by the current measuring device.

Selon un autre aspect avantageux de l'invention, le conduit d'alimentation en mélange d'air et de produit de revêtement débouche axialement dans le projecteur, ce qui permet de limiter encore les phénomène de turbulence et donc l'usure du projecteur.According to another advantageous aspect of the invention, the supply duct for air and product mixture coating opens axially into the projector, which allows to further limit the turbulence phenomenon and therefore wear of the projector.

L'invention concerne aussi une installation de projection de produit de revêtement comprenant un projecteur conforme à l'invention.The invention also relates to a projection installation coating product comprising a headlamp conforming to the invention.

L'invention concerne enfin un procédé de commande d'un projecteur triboélectrique pouvant être mis en oeuvre avec le projecteur de l'invention. Ce procédé est caractérisé en ce qu'il consiste à mesurer la charge obtenue dans le canal de charge et à asservir le débit instantané d'air injecté par l'injecteur à cette charge obtenue dans le canal de charge.The invention finally relates to a method for controlling a triboelectric projector which can be used with the projector of the invention. This process is characterized in that that it consists in measuring the load obtained in the channel charge and control the instantaneous air flow injected by the injector at this charge obtained in the charging channel.

Grâce au procédé de l'invention, le débit instantané d'air injecté est maintenu à une valeur optimale en fonction de la charge triboélectrique à obtenir.Thanks to the method of the invention, the instantaneous air flow injected is maintained at an optimal value depending on the triboelectric charge to be obtained.

Selon un aspect avantageux du procédé de l'invention, il consiste, en outre, à mesurer la valeur du courant de retour à la terre d'un élément conducteur disposé au contact d'un élément constitutif du canal de charge. Cet aspect du procédé de l'invention est une alternative pratique et simple pour la mesure de la charge obtenue dans le canal de charge.According to an advantageous aspect of the process of the invention, it further consists in measuring the value of the return current at the earth of a conductive element arranged in contact with a component of the load channel. This aspect of the process of the invention is a practical and simple alternative for the load measurement obtained in the load channel.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaítront plus clairement à la lumière de la description qui va suivre d'un mode de réalisation d'un projecteur triboélectrique de produit de revêtement pulvérulent conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est un schéma de principe d'installation d'un projecteur triboélectrique de produit de revêtement pulvérulent conforme à l'invention et
  • la figure 2 est une vue en coupe longitudinale du projecteur de la figure 1.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of an embodiment of a triboelectric projector of powder coating product in accordance with its principle, given only by way of example and with reference to the appended drawings in which:
  • FIG. 1 is a block diagram of the installation of a triboelectric projector of powder coating product according to the invention and
  • FIG. 2 is a view in longitudinal section of the projector of FIG. 1.

A la figure 1, un projecteur triboélectrique 1 de produit de revêtement pulvérulent est alimenté à partir d'un résevoir 2 de produit de revêtement en poudre par un conduit d'alimentation 3 qui peut être souple. La poudre contenue dans le réservoir 2 est mise en suspension par un flux d'air délivré par une source commandée 4 à travers un tuyau 5 et traversant une plaque poreuse 6. Un tube plongeur 7 est supporté par une patte 8 au-dessus du réservoir 2 de façon à ce que son extrémité inférieure pénètre dans la poudre en suspension. Une pompe à Venturi 9 montée à l'extrémité supérieure du tube 7 est alimentée par la source commandée 4 à travers un tuyau 10. L'air injecté par le tuyau 10 dans la pompe à Venturi 9 aspire la poudre en suspension par le tube 7 et l'injecte dans le conduit d'alimentation 3. Le projecteur 1 est ainsi alimenté avec un mélange d'air et de produit de revêtement. Un tuyau 11 relie la source commandée 4 au projecteur 1 dont la structure apparaít plus clairement à la figure 2. Le tuyau 11 permet d'alimenter le projecteur 1 en air de dilution et/ou d'accélération du mélange d'air et de produit de revêtement qui circule dans le conduit 3.In FIG. 1, a triboelectric projector 1 of product of powder coating is fed from a reservoir 2 of powder coating product through a supply line 3 which can be flexible. The powder in the tank 2 is suspended by a flow of air delivered by a controlled source 4 through a pipe 5 and passing through a porous plate 6. A dip tube 7 is supported by a tab 8 above the tank 2 so that its end inferior enters the powder in suspension. A pump at Venturi 9 mounted at the upper end of the tube 7 is supplied by the controlled source 4 through a pipe 10. The air injected through the pipe 10 into the Venturi pump 9 sucks the powder suspended in tube 7 and injects it into the supply duct 3. The projector 1 is thus supplied with a mixture of air and coating material. Pipe 11 connects the controlled source 4 to the projector 1, the structure of which appears more clearly in Figure 2. The pipe 11 allows supply the projector 1 with dilution and / or acceleration air of the mixture of air and coating product which circulates in conduit 3.

A la figure 2, on remarque que le projecteur 1 se compose essentiellement d'un canal de charge 12 défini entre un tube externe 13 et un noyau central 14 formé d'un tube 14a et de deux bouchons 14b et 14c, de forme extérieure conique, aptes à être partiellement emmanchés dans les extrémités du tube 14a. Chaque bouchon 14b et 14c porte deux joints toriques 14d dont la fonction est de l'immobiliser à l'intérieur du tube 14a.In FIG. 2, it can be seen that the headlamp 1 essentially consists of a load channel 12 defined between an external tube 13 and a central core 14 formed by a tube 14 a and two plugs 14 b and 14 c , of conical outer shape, able to be partially fitted into the ends of the tube 14 a . Each plug 14 b and 14 c carries two O-rings 14 d whose function is to immobilize it inside the tube 14 a .

Le projecteur comprend aussi un corps 16 muni d'un orifice taraudé 16a à l'intérieur duquel peut être vissé un canon 17 enveloppant l'ensemble de la structure formant le canal de charge 12. A l'extrémité aval du canon 17 peut être montée une buse de projection 18 dont la section de sortie, simple ou multiple, est choisie en fonction de la forme du jet de mélange air-poudre souhaitée. Deux bagues 19 et 20 sont respectivement montées à l'extrémité amont et à l'extrémité aval du tube de charge 12 de façon à immobiliser le noyau central 14 à l'intérieur du corps 16 et du canon 17, ceci permettant de créer le canal 12 entre la surface interne du tube externe 13 et la surface externe du tube interne 14a.The projector also includes a body 16 provided with a threaded orifice 16 a inside which can be screwed a barrel 17 enveloping the whole of the structure forming the load channel 12. At the downstream end of the barrel 17 can be mounted a spray nozzle 18 whose outlet section, single or multiple, is chosen according to the shape of the jet of air-powder mixture desired. Two rings 19 and 20 are respectively mounted at the upstream end and at the downstream end of the load tube 12 so as to immobilize the central core 14 inside the body 16 and the barrel 17, this making it possible to create the channel 12 between the inner surface of the outer tube 13 and the outer surface of the inner tube 14 a .

L'entrée du canal de charge 12 est définie par des orifices 19a percés dans la bague 19 à travers lesquels circule le mélange d'air et de produit de revêtement. Une chambre intérieure de mélange 21 est formée, en amont de l'entrée du canal de charge, dans un embout 22 emmanché dans un orifice central 16b du corps 16. L'embout 22 porte sur sa surface externe deux joints torique 22a destinés à l'immobiliser à l'intérieur de l'orifice 16b. Le conduit d'alimentation 3 est relié à l'embout 22 grâce à un raccord 23 et débouche axialement dans la chambre 21, c'est-à-dire selon la direction de l'axe de symétrie XX' du canal de charge qui est l'axe principal du projecteur.The inlet of the load channel 12 is defined by orifices 19 a drilled in the ring 19 through which the mixture of air and coating product circulates. A mixture of inner chamber 21 is formed upstream of the input of the load channel in a nozzle 22 fitted in a central hole 16b of the body 16. The hub 22 carries on its outer surface two O-ring 22 is intended to immobilize it inside the orifice 16 b . The supply duct 3 is connected to the end piece 22 by means of a connector 23 and opens axially into the chamber 21, that is to say in the direction of the axis of symmetry XX ′ of the load channel which is the main axis of the projector.

D'autre part, et conformément à l'invention, le tuyau 11 est relié à l'intérieur de la chambre 21 grâce à un raccord coudé 24 monté sur un injecteur 25 dont l'orifice de sortie 25a est disposé dans la chambre 21 sur le trajet du mélange d'air et de produit de revêtement dans le projecteur 1 en aval de l'arrivée du conduit 3 dans la chambre 21 et en amont de l'entrée 19a du canal de charge 12.On the other hand, and in accordance with the invention, the pipe 11 is connected to the interior of the chamber 21 by means of an elbow fitting 24 mounted on an injector 25 whose outlet orifice 25 a is disposed in the chamber 21 on the path of the mixture of air and coating product in the projector 1 downstream of the arrival of the conduit 3 in the chamber 21 and upstream of the inlet 19 a of the charge channel 12.

On peut noter, en particulier, que l'orifice 25a est disposé sensiblement sur l'axe XX' de sorte que l'air injecté à travers l'injecteur 25 est dirigé vers le canal de charge selon une direction parallèle et de même sens que celle du mélange d'air et de produit de revêtement pénétrant dans la chambre 21 par le raccord 23. Ainsi, les turbulences générées dans la chambre 21 sont minimales et l'usure de l'embout 22 est faible au cours du temps, ce qui permet de diminuer le coût d'exploitation du projecteur triboélectrique de l'invention par rapport aux dispositifs de l'art antérieur, car le raccord 23 qui constitue l'arrivée ou la sortie du canal d'alimentation 3 et l'orifice 25a de l'injecteur 25 sont disposés selon l'axe XX'. Le mélange d'air et de produit de revêtement pénétrant dans la chambre 21 par le raccord 23 heurte l'arrière de l'injecteur 25, ce qui a pour effet de répartir le mélange d'air et de produit de revêtement dans la chambre 21 et autour du bouchon 14b.It may be noted, in particular, that the orifice 25 a is disposed substantially on the axis XX 'so that the air injected through the injector 25 is directed towards the charge channel in a parallel direction and in the same direction than that of the mixture of air and coating product entering the chamber 21 through the connector 23. Thus, the turbulence generated in the chamber 21 is minimal and the wear of the nozzle 22 is low over time, this which reduces the operating cost of the triboelectric projector of the invention compared to the devices of the prior art, because the connector 23 which constitutes the inlet or outlet of the supply channel 3 and the orifice 25 has of the injector 25 are arranged along the axis XX '. The mixture of air and coating product entering the chamber 21 via the connector 23 strikes the rear of the injector 25, which has the effect of distributing the mixture of air and coating product in the chamber 21 and around the plug 14 b .

En outre, l'air injecté à travers l'orifice 25a a un débit qui peut être commandé par la source 4 indépendamment du débit d'air injectée dans la pompe à Venturi 9, de sorte que la vitesse du mélange d'air et du produit de revêtement dans le canal 12 peut être commandée par la source 4 à travers le tuyau 11 indépendamment du débit de poudre aspirée par la pompe 9. Cette vitesse du mélange dans le canal 12 est liée à la charge triboélectrique obtenue et l'on a pu montrer expérimentalement que, grâce à l'invention, la charge triboélectrique obtenue est sensiblement proportionnelle au débit d'air injecté par l'injecteur 25. Ceci permet donc de commander la charge obtenue dans le dispositif.In addition, the air injected through the orifice 25 a has a flow rate which can be controlled by the source 4 independently of the air flow rate injected into the Venturi pump 9, so that the speed of the air mixture and of the coating product in the channel 12 can be controlled by the source 4 through the pipe 11 independently of the flow rate of powder sucked by the pump 9. This speed of the mixture in the channel 12 is linked to the triboelectric charge obtained and one was able to show experimentally that, thanks to the invention, the triboelectric charge obtained is substantially proportional to the air flow injected by the injector 25. This therefore makes it possible to control the charge obtained in the device.

Plus spécifiquement, un tube conducteur en fibre de carbone 26 est logé dans le canon 17 autour du tube externe 13 en contact avec celui-ci sur la plus grande partie de sa longueur. Le tube 26 apparaít donc comme un drain des charges électrostatiques transmises au tube externe 13 par les particules de poudre. Le tube 26 est en appui contre une vis métallique 27 dont la tige est reliée à la masse par un câble électrique 28. Ainsi, un courant électrique transite par le tube 26 en direction de la masse. L'extrémité du câble 28 est soudée sur une rondelle 29 maintenue en position sur la tige de la vis 27 par un bouton 30.More specifically, a conductive fiber tube carbon 26 is housed in the barrel 17 around the outer tube 13 in contact with it over most of its length. The tube 26 therefore appears as a drain of charges electrostatic transmitted to the outer tube 13 by the particles powder. The tube 26 bears against a metal screw 27, the rod of which is connected to earth by an electric cable 28. Thus, an electric current flows through the tube 26 in direction of mass. The end of the cable 28 is welded to a washer 29 held in position on the rod of the screw 27 with a button 30.

Un dispositif de mesure de courant, tel qu'un ampèremètre, 31 est disposé sur le câble 28. La valeur du courant mesurée par l'ampèremètre 31 est proportionnelle à la charge triboélectrique obtenue dans le canal 12 et peut donc être considérée comme représentative de cette charge. En pratique la valeur du courant détectée par l'ampèremètre 31 est transmise comme variable d'entrée à une unité de commande 32 formée, par exemple, par un automate programmable ou un micro-ordinateur, qui constitue un moyen de contrôle de la source commandée 4. Plus précisément, lorsqu'une valeur de charge triboélectrique est souhaitée, celle-ci est fournie à l'unité 32 comme valeur de consigne par un dispositif de saisie tel qu'un clavier 33. A cette valeur est associée, expérimentalement ou par calcul, une valeur de consigne du courant dans le câble 28. En cours de fonctionnement, la valeur du courant dans le câble 28 est en permanence fournie à l'automate ou au micro-ordinateur 32 et celui-ci commande la source 4 de façon à ce que si la valeur du courant mesurée par l'ampéremètre 31 est inférieure à la valeur de consigne, le débit dans le tuyau 11 est augmenté, c'est-à-dire que le débit d'air d'accélération et/ou de dilution injecté à travers l'injecteur 25 est augmenté. Si au contraire la valeur du courant mesurée par l'ampéremètre 31 est supérieure à la valeur de consigne, le moyen de contrôle 32 commande la source 4 de façon à ce que le débit dans le tuyau 11 soit diminué. Ainsi, le débit d'air injecté par l'injecteur 25 est commandé, grâce au moyen de contrôle 32, par une boucle de régulation ayant pour variable réglante la valeur détectée par le dispositif de mesure de courant constitué par l'ampéremètre 31.A current measuring device, such as an ammeter, 31 is arranged on the cable 28. The value of the current measured by the ammeter 31 is proportional to the triboelectric charge obtained in channel 12 and can therefore be considered as representative of this charge. In practice the value of current detected by ammeter 31 is transmitted as input variable to a control unit 32 formed, by example, by a programmable controller or a microcomputer, which is a means of controlling the controlled source 4. More specifically, when a triboelectric charge value is desired, this is supplied to unit 32 as a value setpoint by an input device such as a keyboard 33. This value is associated, experimentally or by calculation, a current setpoint in the cable 28. During operation, the value of the current in the cable 28 is in permanence provided to the automaton or to the microcomputer 32 and this controls source 4 so that if the value of current measured by ammeter 31 is less than the value the flow rate in the pipe 11 is increased, that is to say that the acceleration and / or dilution air flow injected through injector 25 is increased. If on the contrary the value of the current measured by the ammeter 31 is greater at the set value, the control means 32 controls source 4 so that the flow in the pipe 11 be reduced. Thus, the air flow injected by the injector 25 is controlled, by means of control 32, by a loop regulator whose regulating variable is the detected value by the current measurement device constituted by the ammeter 31.

En d'autres termes, on est en présence d'un procédé de commande du projecteur 1, caractérisé en ce qu'il consiste à mesurer la charge obtenue dans le canal de charge 12 et à asservir grâce, à l'automate ou à l'ordinateur 32, le débit instantané d'air injecté par la source 4 dans le tuyau 11 à travers l'injecteur 25 à la charge obtenue dans le canal 12. Ce procédé consiste, en outre, à mesurer la valeur du courant de retour à la terre de l'élément 26 conducteur, qui est disposé au contact du tube 13, et à utiliser cette valeur comme une variable représentative de la charge obtenue dans le canal.In other words, we are in the presence of a process of control of headlamp 1, characterized in that it consists of measure the charge obtained in charge channel 12 and at using the PLC or computer 32 to control the flow instantaneous air injected by the source 4 into the pipe 11 to through the injector 25 to the charge obtained in the channel 12. This method further includes measuring the value of the return to earth of the conductive element 26, which is arranged in contact with the tube 13, and to use this value as a variable representative of the load obtained in the channel.

L'invention a été présentée avec un projecteur triboélectrique automatique, mais elles s'applique, de façon évidente pour l'homme du métier, à un projecteur manuel.The invention has been presented with a triboelectric projector automatic, but they obviously apply for those skilled in the art, to a manual projector.

Claims (9)

Projecteur triboélectrique (1) de produit de revêtement pulvérulent comprenant un canal de charge (12) du produit de revêtement, un conduit d'alimentation (3) reliant une source (2) de produit de révêtement audit projecteur, un mélange d'air et de produit de revêtement circulant dans ledit conduit, un injecteur (25) d'air de dilution et/ou d'accélération dudit mélange d'air et de produit de revêtement, caractérisé en ce que l'orifice de sortie (25a) dudit injecteur est disposé sur le trajet dudit mélange d'air et de produit de revêtement dans une chambre (21) intérieure dudit projecteur, en aval de l'arrivée (23) dudit conduit dans ledit projecteur et en amont de l'entrée (19a) dudit canal de charge.Triboelectric projector (1) of powdery coating product comprising a channel (12) for loading the coating product, a supply duct (3) connecting a source (2) of coating product to said projector, a mixture of air and of coating product circulating in said conduit, an air injector (25) for diluting and / or accelerating said mixture of air and coating product, characterized in that the outlet orifice (25 a ) of said injector is disposed on the path of said mixture of air and coating product in an interior chamber (21) of said projector, downstream of the inlet (23) of said duct in said projector and upstream of the inlet (19 a ) of said load channel. Projecteur triboélectrique selon la revendication 1, caractérisé en ce que l'orifice de sortie (25a) dudit injecteur (25) est disposé sensiblement sur un axe de symétrie dudit canal de charge (XX').Triboelectric projector according to claim 1, characterized in that the outlet orifice (25a) of said injector (25) is disposed substantially on an axis of symmetry of the said charging channel (XX '). Projecteur triboélectrique selon la revendication 1 ou 2, caractérisé en ce que ledit canal de charge est formé d'un tube externe (13) et d'un noyau central (14) en matériau électriquement isolant, ledit tube externe étant muni, sur sa face externe, d'une couche électriquement conductrice (26) reliée à la masse à travers un dispositif de mesure de courant (31).Triboelectric projector according to claim 1 or 2, characterized in that said charging channel is formed of a outer tube (13) and a central core (14) made of material electrically insulating, said external tube being provided, on its external face, of an electrically conductive layer (26) connected to ground through a current measuring device (31). Projecteur triboélectrique selon la revendication 3, caractérisé en ce qu'il comprend des moyens (4, 32) de contrôle du débit instantané d'air injecté par ledit injecteur (25), lesdits moyens de contrôle étant commandés à partir de la valeur détectée par ledit dispositif de mesure de courant (31).Triboelectric projector according to claim 3, characterized in that it comprises means (4, 32) for controlling the instantaneous flow of air injected by said injector (25), said control means being controlled from the value detected by said current measuring device (31). Projecteur triboélectrique selon la revendication 4, caractérisé en ce que ledit débit d'air injecté par ledit injecteur (25) est commandé par une boucle de régulation ayant pour variable réglante la valeur détectée par ledit dispositif de mesure de courant (31).Triboelectric projector according to claim 4, characterized in that said air flow injected by said injector (25) is controlled by a regulation loop having for regulating variable the value detected by said device current measurement (31). Projecteur triboélectrique selon la revendication 5, caractérisé en ce que le conduit (3) d'alimentation en mélange d'air et de produit de revêtement débouchent axialement (XX') dans ledit projecteur (1).Triboelectric projector according to claim 5, characterized in that the mixture supply pipe (3) of air and coating product open axially (XX ') in said projector (1). Installation de projection de produit de revêtement comprenant un projecteur selon l'une des revendications 1 à 6.Coating product spraying installation comprising a headlight according to one of claims 1 to 6. Procédé de commande d'un projecteur triboélectrique (1) de produit de revêtement pulvérulent comprenant un canal de charge (12) du produit de revêtement, un conduit d'alimentation (3) reliant une source de produit de révêtement (2) audit projecteur, un mélange d'air et de produit de revêtement circulant dans ledit conduit, un injecteur (25) d'air de dilution et/ou d'accélération dudit mélange d'air et de produit de revêtement, caractérisé en ce qu'il consiste à mesurer la charge obtenue dans ledit canal de charge et à asservir le débit instantané d'air injecté par ledit injecteur à ladite charge obtenue dans ledit canal de charge.Method for controlling a triboelectric projector (1) of powder coating product comprising a channel loading (12) of the coating product, a supply duct (3) connecting a source of coating product (2) to said audit projector, a mixture of air and coating product circulating in said duct, an injector (25) of air dilution and / or acceleration of said mixture of air and product coating, characterized in that it consists in measuring the charge obtained in said charge channel and to control the instantaneous flow of air injected by said injector into said charge obtained in said charge channel. Procédé selon la revendication 8, caractérisé en ce qu'il consiste, en outre, à mesure la valeur du courant de retour à la terre d'un élément conducteur (26) disposé au contact d'un élément (13) constitutif dudit canal de charge et à utiliser la valeur ainsi obtenue comme une variable représentative de la charge obtenue dans ledit canal.Method according to claim 8, characterized in that that it consists, moreover, in measuring the current of return to earth of a conductive element (26) disposed at the contact of an element (13) constituting said load channel and to use the value thus obtained as a representative variable of the charge obtained in said channel.
EP97420104A 1996-07-10 1997-07-02 Triboelectric spray gun, installation for spraying coating products and method for controlling such a gun Expired - Lifetime EP0818245B1 (en)

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FR9608894 1996-07-10
FR9608894A FR2750897B1 (en) 1996-07-10 1996-07-10 TRIBOELECTRIC PROJECTOR, COATING PRODUCT PROJECTION INSTALLATION AND METHOD FOR CONTROLLING SUCH A PROJECTOR

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US5924631A (en) 1999-07-20
FR2750897A1 (en) 1998-01-16
ATE209530T1 (en) 2001-12-15
FR2750897B1 (en) 1998-09-18
EP0818245B1 (en) 2001-11-28
DE69708528D1 (en) 2002-01-10

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