EP2983831B1 - Apparatus for electrostatically spraying a coating product and method for controlling generator for supplying power to a high voltage unit in such an apparatus - Google Patents

Apparatus for electrostatically spraying a coating product and method for controlling generator for supplying power to a high voltage unit in such an apparatus Download PDF

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Publication number
EP2983831B1
EP2983831B1 EP14719651.3A EP14719651A EP2983831B1 EP 2983831 B1 EP2983831 B1 EP 2983831B1 EP 14719651 A EP14719651 A EP 14719651A EP 2983831 B1 EP2983831 B1 EP 2983831B1
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EP
European Patent Office
Prior art keywords
valve
sprayer
sensor
voltage unit
coating product
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EP14719651.3A
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German (de)
French (fr)
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EP2983831A1 (en
Inventor
Gilles GOISOT
Michel DI-GIOIA
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Sames Kremlin SAS
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Sames Kremlin SAS
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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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • 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
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
    • 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • 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
    • B05B5/053—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to an electrostatic coating apparatus coating apparatus as well as to a method of controlling a power supply generator of a high voltage unit within such an installation.
  • the electrostatic coating apparatus coating apparatus electrically charges a coating material and provides a good transfer rate of the coating product to the substrate to be coated.
  • a persistent challenge for electrostatic coating equipment installations is to control the start of the high electrostatic voltage and thus to control a power supply generator of a high voltage unit included in a sprayer, the sprayer being included in the installation.
  • FR-A-2,578,450 it is known to FR-A-2,578,450 to use a first magnetic sensor actuated by a permanent magnet arranged in a variable position on a body of a gun and a second sensor used as a switch and which allows voluntarily to cut the generation of a high voltage by a high voltage unit, so to facilitate the coating of hollow bodies.
  • This type of device implies that the sensors must be able to cut an alternating voltage ranging from 20 to 35 kHz under an intensity of at least 1 A and a peak voltage of the order of 80 to 100 volts. Indeed, the sensors once actuated directly cut the power supply of the high voltage unit by closing or cutting the primary power supply circuit of the transformer.
  • JP-A-2004 26 7960 and of US Patent 4752034 an electrostatic spraying installation which comprises a current control module delivered to a high voltage unit, according to a specific parameter specific to an air valve of the sprayer.
  • the control module directly cuts off the current and the voltage delivered to the high voltage unit by the control module, which causes problems in the lifetime and dimensioning of the control module and a possible device for measuring the specific parameter.
  • the invention more particularly intends to remedy by proposing an electrostatic coating device for coating product which makes it possible to control in a reliable and precise manner a power supply generator. of a high voltage unit, this without having to detect the consumption of a fluid, air type or coating product.
  • the sensors used have dimensions compatible with their insertion into a spray gun since the current and the voltage passing through the sensors are low levels. Indeed, the signal produced by the sensor does not directly cut the power supply of the high voltage unit but sends a signal to the current control module delivered to the high voltage unit which cuts or switches itself on. power supply of the high voltage unit according to this signal. There is a much safer and more durable operation of the sensors and the control of the power supply of the high voltage unit is improved.
  • the installation I represented at figure 1 allows the electrostatic coating of an object not shown.
  • This installation I comprises an electrostatic coating sprayer or spray gun 1 supplied with liquid coating material from a coating product tank 30, via a pipe 31.
  • the gun 1 is also connected to a source of pressurized air 40 by a pipe 41.
  • the air from the source 40 is used to spray the coating product by driving it from the gun 1 towards the object to be coated.
  • Note 2 a housing located in a gun 11 of the gun 1 in which a needle 62 slides.
  • the needle is intended to control the flow of coating material and to be brought to a high voltage in order to electrically charge the coating product.
  • This duct 4 for circulation of the coating product is connected to the pipe 31 via a connector 32, located at the base of a Handle 16 of the sprayer 1.
  • the conduit 4 opens near a spray outlet S of the coating material at one end 63 of the needle 62 which forms a triangular tip.
  • the end 63 is in abutment against a seat 64 of corresponding shape and closes the conduit 4.
  • the assembly formed by the needle 62 and the seat 64 corresponds to a valve 6 for controlling the flow of the coating product.
  • This duct 5 comprises two sections 5a, 5b between which is a valve 7 for controlling the flow of air.
  • the second section 5b of the duct 5 opens at the outlet S spraying the coating product.
  • the air flow duct 5 is connected to the pipe 41 via a connector 42 located at the rear of a body 21 of the gun 1.
  • the air flow control valve 7 comprises a valve 72, of a shape adapted to bear against a seat 74, of corresponding shape, under the effect of a return force R exerted by a spring 22 maintained in position by a plug 23 forming a fixed bearing point for this spring 22.
  • the end 63 of the needle 62 is shaped to bear against the seat 64, of corresponding shape, under the effect of the R.
  • the gun 1 is also connected to a generator 8 by an electric cable 9 which supplies power to a high voltage unit 10 disposed in the barrel 11 of the gun 1.
  • the generator 8 is itself supplied with current from the sector, by means of a cable 82.
  • This control module 12 is included in the generator 8.
  • the unit high voltage 10 When it is powered by the generator 8, the unit high voltage 10 generates a high DC voltage applied to the end 63 of the needle 62 which electrically charges by ionization the sprayed coating product at the outlet S.
  • the high voltage unit is clean, in response to its supply by the generator 8, also called power supply 8, to generate a high DC voltage and to apply the high voltage to the end 63 of the needle 62.
  • the high voltage unit is clean, in response to its supply by the generator 8, to generate a high DC voltage and to apply the high voltage to a charging electrode, not shown, positioned at the output S, at near the end 63.
  • the coating product is thus electrically charged.
  • a trigger 15 is articulated on the body 21 of the pistol 1 about an axis X2 generally perpendicular to a longitudinal axis of the barrel Y2 and allows the opening and closing of the air valve and the movement of the needle 62 according to a direction parallel to the axis Y2. More specifically, the trigger 15 comprises an extension 152 in support against the valve 72, which allows to exert on the valve 72 a force opposite to the return force R to shift axially along the axis Y2, the valve 72 relative to its seat 74. The extension 152 is therefore able to exert on the valve 72 a force opposite to the return force R to shift axially along the longitudinal axis Y2, the valve 72 relative to the seat 74.
  • the needle 62 is attached to the extension 152, which allows to exert on the needle 62 a force opposite to the return force R to shift axially along the axis Y2, the needle 62 and more precisely its end 63 with respect to its seat 64.
  • the extension 152 is thus able to exert on the needle 62 a force opposite to the return force R to shift axially along the longitudinal axis Y2, the needle 62 by relative to the seat 64.
  • the handle 15 is released, the spring 22 pushes the needle 62 and the valve 72 towards the interruption position of s ducts 4 and 5 shown in figure 1 .
  • the trigger 15 thus makes it possible to control the circulation of coating product and air under pressure in the conduits 4, 5.
  • a sensor 17 is positioned in the body 21 near the needle 62 and detects the movement of the needle 62 when the trigger 15 is actuated.
  • This sensor 17 can be of any type adapted to its function and, in particular, a Reed sensor. Alternatively, it is a capacitive or inductive sensor or a Hall effect sensor, or a magnetic field detector.
  • the end 63 of the needle 62 is detached from the seat 64 and a flow of coating product occurs through the conduit 4.
  • the valve 72 of the air valve 7 is detached from the seat 74 and an air flow occurs through the air flow duct 5. Thus a flow of air and coating product occurs towards the S output.
  • the sensor 17 is connected to the control module 12 via a cable 13.
  • a second sensor 18 is positioned near a switch 19 positioned on the body 21 of the gun 1.
  • the operator can manually change the position of the switch 19 knowing that the sensor 18 is able to detect the position of the switch 19.
  • the sensor 18 may be of the same type as the sensor 17 or of another type.
  • the cable 13 comprises a first section 13a which extends between the control module 12 and the sensor 17, a second section 13b which extends between the sensors 17 and 18 and a third section 13c which extends between the sensor 18 and the control module 12.
  • the sensors 17 and 18 are connected in series to the control module 12, through the cable 13.
  • the sensors 17 and 18 are, for example, mounted on a printed circuit, not shown and overmolded in an electrically insulating resin.
  • the switch 19 is intended to be manipulated by the operator to pass from a first "electrostatic" configuration of the gun where the high voltage is applied to the end 63 of the needle 62 to a second "purely pneumatic" configuration where the unit 10 is not powered. This second configuration is useful for coating certain hollow or complex shape objects.
  • the spring 22 is made of non-magnetic material so it does not disturb the motion detection performed by the sensors 18, 17 in the case where the sensors 17, 18 are Reed sensors and, more generally, sensors of the magnetic type.
  • control 12 controls the power supply of the high voltage unit 10 as a function of the value of the received signal S1.
  • Zone A is located above the valve 7 and the needle 62, in the upper part of the body 21, which facilitates access to the switch 19.
  • the electrostatic projection installation detects a movement of the needle 62 and takes into account any change of position of the switch 19.
  • the sensors 17 and 18 are Reed sensors, they are arranged in the part A of the body 21 to be closed when the needle 62 is shifted from the seat 64 and when the switch 19 is in a first ON position corresponding to the "electrostatic" configuration of the gun 1.
  • the cable 13 forms an uninterrupted electrical loop, which can be detected by the module of control 12 which injects a signal on this cable and which retrieves it in the form of signal S1.
  • the control module 12 drives the generator 8 to power the unit 10.
  • the control module 12 drives the generator 8 so as not to supply the unit 10.
  • a signal S1 corresponding to the movement of the coating material valve 6, and more precisely of the needle 62, and to the position of the switch 19 is transmitted to the control module 12 via the cable 13 adapted to the type of sensor used.
  • the control module 12 switches on or off the power supply of the high voltage unit 10 as a function of the signal S1 received.
  • the signal S1 sent by the sensor 18 to the control module 12 triggers the cut-off of the supply of the high voltage unit 10 by the generator 8. This cut is maintained until switch 19 is in the ON position, it allows for example the operator to more easily coat hollow bodies avoiding counter-emission phenomena or Faraday cage.
  • the breaking or switching on of the supply of the high voltage unit 10 by the generator 8 depends on the position of the needle 62 of the coating product valve 6. If the displacement detected corresponds to a stroke greater than a reference value, then the signal S1 sent by the sensor 17 to the control module 12 induces the switching on of the supply of the high voltage unit and, if not, the signal S1 sent by the sensor 17 induces the cutting or non-engagement of the supply of the high voltage unit.
  • the sensor 17 detects a movement of the valve 72 of the air valve 7 and not a movement of the needle 62 of the valve 6. The operation remains identical to that presented above.
  • the sprayer may comprise only a sensor 17 and no sensor 18 or switch 19.
  • the engagement of the high voltage can not be cut manually by the operator and depends solely on the movement of the valve 7 or the valve 6.
  • the installation represented at figure 1 presents a manual sprayer.
  • the invention is however applicable to an automatic sprayer, in which case the valves are controlled remotely.
  • the sprayed coating product is powdery, in which case only one coating product circulation conduit through which the powder coating product is pneumatically conveyed is required. There is no need for an air flow duct and only one valve is used.
  • connection between the sensors 17, 18 and the control module 12 is a wireless link.
  • the sensors 17, 18 can transmit the signal S1 to the control module 12 by means of radio waves.
  • the generator 8 and powered by means of an autonomous source.
  • the air circulation duct 5 comprises two second sections which are positioned along the housing of the needle and open at the outlet S on either side of the needle 62.

Description

L'invention a trait à une installation de projection électrostatique de produit de revêtement ainsi qu'un à un procédé de commande d'un générateur d'alimentation en courant d'une unité haute tension au sein d'une telle installation.The invention relates to an electrostatic coating apparatus coating apparatus as well as to a method of controlling a power supply generator of a high voltage unit within such an installation.

Les installations de projection électrostatique de produit de revêtement permettent de charger électriquement un produit de revêtement et offrent un bon taux de transfert du produit de revêtement sur le support à recouvrir.The electrostatic coating apparatus coating apparatus electrically charges a coating material and provides a good transfer rate of the coating product to the substrate to be coated.

Un enjeu persistant pour les installations de projection électrostatique de produit de revêtement est de contrôler la mise en route de la haute tension électrostatique et donc de contrôler un générateur d'alimentation en courant d'une unité haute tension comprise dans un pulvérisateur, le pulvérisateur étant compris dans l'installation.A persistent challenge for electrostatic coating equipment installations is to control the start of the high electrostatic voltage and thus to control a power supply generator of a high voltage unit included in a sprayer, the sprayer being included in the installation.

Dans le domaine de la projection de produit de revêtement au moyen d'un pulvérisateur électrostatique, il est connu d'installer sur un conduit de circulation d'air de pulvérisation du pulvérisateur un interrupteur pneumatique, plus fréquemment appelé « débit-contact », qui ferme un contact électrique lorsqu'il détecte un débit d'air suffisant. La fermeture de ce contact électrique permet l'alimentation en courant d'une unité haute tension. Un tel débit-contact a un temps de réponse relativement long, un encombrement et un poids importants, une forte rémanence. Son fonctionnement est peu fiable lorsque le débit d'air est faible. Ceci implique que le point de déclenchement de la haute tension est plus ou moins précis, notamment à cause du temps de réponse et de la rémanence du capteur.In the field of spraying coating product by means of an electrostatic sprayer, it is known to install on a sprayer air circulation duct a pneumatic switch, more frequently called "contact flow", which closes an electrical contact when it detects sufficient airflow. Closing this electrical contact allows the power supply of a high voltage unit. Such a contact rate has a relatively long response time, a large size and weight, a high remanence. Its operation is unreliable when the air flow is low. This implies that the trigger point of the high voltage is more or less accurate, especially because of the response time and the remanence of the sensor.

Il est par ailleurs connu de US-A-4 441 656 de contrôler un générateur d'alimentation en courant d'une unité haute tension grâce à la position d'une extrémité d'une gâchette actionnée par un opérateur. Cette approche permet de s'assurer que la haute tension est enclenchée uniquement lorsque la gâchette est actionnée. Ce matériel ne permet pas de tenir compte d'éventuels défauts dans l'alimentation en air d'un pulvérisateur dans lequel on utilise de l'air de pulvérisation. En outre, ce dispositif est encombrant, lourd et onéreux.It is also known from US-A-4,441,656 to control a power supply generator of a high voltage unit by the position of an end of a trigger actuated by an operator. This approach ensures that the high voltage is engaged only when the trigger is actuated. This equipment does not allow to take into account any defects in the air supply of a sprayer in which is used air spray. In addition, this device is bulky, heavy and expensive.

Il est aussi connu de réaliser un pulvérisateur pour lequel l'action sur une gâchette ouvre une fuite d'air dans le pulvérisateur, cette fuite étant détectée par un ou deux capteurs de pression montés en différentiel qui permettent, lorsqu'une telle fuite d'air est détectée, de déclencher un générateur d'alimentation en courant d'une unité haute tension. Le problème engendré par l'utilisation d'une fuite d'air sur un projecteur est une consommation d'air comprimé inutile, bien souvent une gêne pour l'opérateur et la mise en place de circuits pneumatiques complexes qui supportent mal les surcharges temporaires, ce qui est une source de pannes et de dysfonctionnements. De plus, dans ce type de système, des phénomènes de dérive dans le temps du seuil de détection des capteurs de pression sont observés de manière courante. Ceci implique que l'unité haute tension ne s'enclenche plus de manière fiable, d'où des surconsommations de produit importantes et des risques supplémentaires pour la sécurité des personnes et des biens.It is also known to make a sprayer for which the action on a trigger opens an air leak in the sprayer, this leak being detected by one or two pressure sensors mounted differential that allow, when such a leakage air is detected, to trigger a power supply generator of a high voltage unit. The problem caused by the use of an air leak on a projector is an unnecessary consumption of compressed air, very often an inconvenience for the operator and the installation of complex pneumatic circuits that do not support temporary overloads, which is a source of breakdowns and malfunctions. In addition, in this type of system, phenomena of drift over time of the detection threshold of the pressure sensors are commonly observed. This implies that the high voltage unit no longer reliably triggers, resulting in significant product consumption and additional risks to the safety of people and property.

En outre, il est connu de FR-A-2 578 450 d'utiliser un premier capteur magnétique actionné par un aimant permanent disposé en position variable sur un corps d'un pistolet et un second capteur utilisé comme interrupteur et qui permet de couper volontairement la génération d'une haute tension par une unité haute tension, afin de faciliter le revêtement de corps creux. Ce type de dispositif implique que les capteurs doivent être capables de couper une tension alternative variant de 20 à 35 KHz sous une intensité d'au moins 1 A et une tension crête de l'ordre de 80 à 100 Volts. En effet, les capteurs une fois actionnés coupent directement l'alimentation électrique de l'unité haute tension en fermant ou coupant le circuit d'alimentation électrique du primaire du transformateur. De plus, lors de l'utilisation de ce type d'installation l'opérateur appuie et relâche une gâchette d'un pulvérisateur entre 6 à 12 fois par minute. Le premier capteur est donc fortement sollicité. Ces contraintes conduisent à utiliser des capteurs dont les dimensions sont quasiment incompatibles avec leur insertion à l'intérieur d'un pistolet de projection électrostatique de produit de revêtement et, même en utilisant des capteurs de grandes dimensions, leur durée de vie est fortement réduite dans un tel dispositif, à cause des hauts niveaux de tension et de courant qu'ils doivent couper.In addition, it is known to FR-A-2,578,450 to use a first magnetic sensor actuated by a permanent magnet arranged in a variable position on a body of a gun and a second sensor used as a switch and which allows voluntarily to cut the generation of a high voltage by a high voltage unit, so to facilitate the coating of hollow bodies. This type of device implies that the sensors must be able to cut an alternating voltage ranging from 20 to 35 kHz under an intensity of at least 1 A and a peak voltage of the order of 80 to 100 volts. Indeed, the sensors once actuated directly cut the power supply of the high voltage unit by closing or cutting the primary power supply circuit of the transformer. In addition, when using this type of installation the operator presses and releases a trigger of a sprayer between 6 to 12 times per minute. The first sensor is therefore strongly solicited. These constraints lead to the use of sensors whose dimensions are almost incompatible with their insertion inside an electrostatic spray gun coating product and, even using large sensors, their life is greatly reduced in such a device, because of the high levels of voltage and current that they must cut.

Il est également connu de JP-A-2004 26 7960 et de US-A-4752034 une installation de projection électrostatique qui comprend un module de contrôle du courant délivré à une unité haute tension, en fonction d'un paramètre spécifique propre à une vanne d'air du pulvérisateur. Cependant, dans une telle installation, le module de contrôle coupe directement le courant et la tension délivrés à l'unité haute tension par le module de contrôle, ce qui engendre des problèmes de durée de vie et de dimensionnement du module de contrôle et d'un éventuel organe de mesure du paramètre spécifique.It is also known to JP-A-2004 26 7960 and of US Patent 4752034 an electrostatic spraying installation which comprises a current control module delivered to a high voltage unit, according to a specific parameter specific to an air valve of the sprayer. However, in such an installation, the control module directly cuts off the current and the voltage delivered to the high voltage unit by the control module, which causes problems in the lifetime and dimensioning of the control module and a possible device for measuring the specific parameter.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant une installation de projection électrostatique de produit de revêtement qui permet de contrôler de manière fiable et précise un générateur d'alimentation en courant d'une unité haute tension, ceci sans devoir détecter la consommation d'un fluide, de type air ou produit de revêtement.It is to these drawbacks that the invention more particularly intends to remedy by proposing an electrostatic coating device for coating product which makes it possible to control in a reliable and precise manner a power supply generator. of a high voltage unit, this without having to detect the consumption of a fluid, air type or coating product.

A cet effet, l'invention concerne une installation de projection électrostatique de produit de revêtement comprenant :

  • un pulvérisateur pourvu d'un premier conduit et d'un deuxième conduit, respectivement de circulation de produit de revêtement et d'air, dans lesquels la circulation de produit de revêtement et d'air est contrôlée par au moins une vanne, ce pulvérisateur comprenant également des moyens de commande de l'ouverture/fermeture de la vanne et une unité haute tension,
  • un générateur d'alimentation en courant de l'unité haute tension, ce générateur comprenant un module de contrôle du courant d'alimentation délivré à l'unité haute tension,
le pulvérisateur comprenant au moins un premier capteur apte à détecter la position d'un clapet de la vanne par rapport à un siège et à délivrer un signal exploitable par le module de contrôle pour contrôler l'alimentation en courant de l'unité haute tension. Conformément à l'invention, le pulvérisateur comprend un second capteur apte à détecter la position d'un interrupteur positionné sur le pistolet et à délivrer un signal exploitable par le module de contrôle pour contrôler l'alimentation en courant de l'unité haute tension.For this purpose, the invention relates to an electrostatic projection apparatus for a coating product comprising:
  • a sprayer provided with a first conduit and a second conduit, respectively for circulation of coating product and air, in which the circulation of coating and air product is controlled by at least one valve, this sprayer comprising also means for controlling the opening / closing of the valve and a high voltage unit,
  • a power supply generator of the high voltage unit, this generator comprising a control module of the supply current delivered to the high voltage unit,
the sprayer comprising at least a first sensor adapted to detect the position of a valve of the valve relative to a seat and to deliver a signal operable by the control module to control the power supply of the high voltage unit. According to the invention, the sprayer comprises a second sensor adapted to detect the position of a switch positioned on the gun and to deliver a signal that can be used by the control module to control the power supply of the high voltage unit.

Grâce à l'invention, les capteurs utilisés ont des dimensions compatibles avec leur insertion dans un pistolet de projection puisque le courant et la tension traversant les capteurs sont de bas niveaux. En effet, le signal produit par le capteur ne coupe pas directement l'alimentation de puissance de l'unité haute tension mais envoie un signal au module de contrôle du courant délivré à l'unité haute tension qui coupe ou enclenche lui-même l'alimentation en courant de l'unité haute tension en fonction de ce signal. On a un fonctionnement beaucoup plus sûr et pérenne des capteurs et le contrôle de l'alimentation en courant de l'unité haute tension est amélioré.Thanks to the invention, the sensors used have dimensions compatible with their insertion into a spray gun since the current and the voltage passing through the sensors are low levels. Indeed, the signal produced by the sensor does not directly cut the power supply of the high voltage unit but sends a signal to the current control module delivered to the high voltage unit which cuts or switches itself on. power supply of the high voltage unit according to this signal. There is a much safer and more durable operation of the sensors and the control of the power supply of the high voltage unit is improved.

Selon des aspects avantageux mais non obligatoires de l'invention, une telle installation de projection électrostatique de produit de revêtement peut incorporer une ou plusieurs des caractéristiques suivantes, prises dans toute combinaison techniquement admissible :

  • Le pulvérisateur comprend une première vanne de contrôle de l'écoulement de produit de revêtement dans le premier conduit et une deuxième vanne de contrôle de l'écoulement d'air entre deux tronçons du deuxième conduit, alors que le premier capteur est apte à détecter la position d'un clapet de la première vanne.
  • Le pulvérisateur comprend une première vanne de contrôle de l'écoulement de produit de revêtement dans le premier conduit et une deuxième vanne de contrôle de l'écoulement d'air entre deux tronçons du deuxième conduit, alors que le premier capteur est apte à détecter la position d'un clapet de la deuxième vanne.
  • La première vanne de contrôle de l'écoulement de produit de revêtement comprend un clapet formant une aiguille coulissant dans un canon du pulvérisateur, destinée à contrôler l'écoulement de produit de revêtement et destinée à être portée à une haute tension, pour charger électriquement le produit de revêtement.
  • Le pulvérisateur comprend un ressort en matériau amagnétique qui exerce un effort de rappel sur le clapet de la vanne.
  • L'aiguille comprend une extrémité de forme adaptée pour venir en appui contre un siège de la première vanne de forme correspondante sous l'effet de l'effort de rappel.
  • L'unité haute tension est disposée dans le canon du pulvérisateur et est propre, en réponse à l'alimentation de l'unité haute tension par l'alimentation en courant, à générer une haute tension continue et à appliquer la haute tension à l'extrémité de l'aiguille.
  • L'interrupteur est destiné à être manipulé par un opérateur pour passer d'une première configuration du pulvérisateur, où la haute tension est appliquée à l'extrémité de l'aiguille, à une deuxième configuration, où l'unité haute tension n'est pas alimentée électriquement.
  • La deuxième vanne de contrôle de l'écoulement d'air comprend un clapet, de forme adaptée pour venir en appui contre un siège de la deuxième vanne de forme correspondante, sous l'effet de l'effort de rappel.
  • Une gâchette est articulée sur un corps du pulvérisateur autour d'un axe globalement perpendiculaire à un axe longitudinal d'un canon du pulvérisateur.
  • La gâchette comprend une extension, en appui contre le clapet de la vanne et propre à exercer sur le clapet un effort opposé à l'effort de rappel, pour décaler axialement, le long de l'axe longitudinal, le clapet de la vanne par rapport au siège.
  • Les premier et second capteurs sont montés en série sur un câble de liaison de ces capteurs au module de contrôle.
  • Le premier capteur est un capteur Reed ou un capteur à effet Hall.
  • Le pulvérisateur comprend une zone étanche au sein de laquelle sont positionnés le ou les capteurs.
According to advantageous but non-obligatory aspects of the invention, such an electrostatic coating device may incorporate one or more of the following features, taken in any technically permissible combination:
  • The sprayer comprises a first control valve for the flow of coating product in the first duct and a second valve for controlling the flow of air between two sections of the second duct, while the first sensor is able to detect the position of a valve of the first valve.
  • The sprayer comprises a first control valve for the flow of coating product in the first duct and a second valve for controlling the flow of air between two sections of the second duct, while the first sensor is able to detect the position of a valve of the second valve.
  • The first coating product flow control valve comprises a valve forming a sliding needle in a spray gun, for controlling the flow of coating material and intended to be brought to a high voltage, for electrically charging the coating product.
  • The sprayer comprises a spring of non-magnetic material which exerts a return force on the valve of the valve.
  • The needle comprises a shaped end adapted to bear against a seat of the first valve of corresponding shape under the effect of the return force.
  • The high voltage unit is disposed in the gun of the sprayer and is clean, in response to the supply of the high voltage unit by the power supply, to generate a high DC voltage and to apply the high voltage to the end of the needle.
  • The switch is intended to be manipulated by an operator to go from a first configuration of the sprayer, where the high voltage is applied to the end of the needle, to a second configuration, where the high voltage unit is not electrically powered.
  • The second air flow control valve comprises a valve, shaped to fit against a seat of the second valve of corresponding shape, under the effect of the return force.
  • A trigger is hinged to a sprayer body about an axis generally perpendicular to a longitudinal axis of a spray gun.
  • The trigger comprises an extension, bearing against the valve of the valve and adapted to exert on the valve a force opposite to the return force, to shift axially, along the longitudinal axis, the valve of the valve relative at headquarters.
  • The first and second sensors are connected in series on a cable connecting these sensors to the control module.
  • The first sensor is a Reed sensor or a Hall effect sensor.
  • The sprayer comprises a sealed zone in which the sensor or sensors are positioned.

L'invention concerne également un procédé de commande d'un générateur d'alimentation en courant d'une unité haute tension comprise dans un pulvérisateur électrostatique de produit de revêtement. Conformément à l'invention, le procédé comprend des étapes consistant à :

  • a) détecter, d'une part, la position d'un clapet d'une vanne comprise dans le pulvérisateur et mise en mouvement à l'aide de moyens d'ouverture/fermeture de celle-ci et, d'autre part, le changement de position d'un interrupteur fixé sur le pistolet
  • b) transmettre un signal correspondant à la position de la vanne et à la position de l'interrupteur à un module de contrôle du générateur par l'intermédiaire d'une liaison adaptée au type de capteur utilisé,
  • c) contrôler la coupure ou l'enclenchement du générateur, en fonction du signal reçu et à l'aide du module de contrôle.
The invention also relates to a method of controlling a power supply generator of a high voltage unit included in an electrostatic coating product sprayer. According to the invention, the method comprises steps of:
  • a) detecting, on the one hand, the position of a valve of a valve included in the sprayer and set in motion by means of opening / closing means thereof and, on the other hand, the change of position of a switch attached to the gun
  • b) transmitting a signal corresponding to the position of the valve and the position of the switch to a generator control module via a connection adapted to the type of sensor used,
  • c) check the cut-off or switching on of the generator, according to the signal received and using the control module.

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'un mode de réalisation d'une installation de projection électrostatique de produit de revêtement et d'un procédé de commande conforme à son principe, donnée uniquement à titre d'exemple et faite en se référant au dessin annexé dans lequel la figure 1 montre schématiquement une installation conforme à l'invention, avec un pulvérisateur représenté en coupe.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 an electrostatic coating equipment coating system and a method of command in accordance with its principle, given solely by way of example and with reference to the appended drawing in which the figure 1 shows schematically an installation according to the invention, with a sprayer shown in section.

L'installation I représentée à la figure 1 permet le revêtement par voie électrostatique d'un objet non représenté. Cette installation I comprend un pulvérisateur ou pistolet 1 de revêtement électrostatique alimenté en produit de revêtement liquide à partir d'un réservoir 30 de produit de revêtement, par un tuyau 31.The installation I represented at figure 1 allows the electrostatic coating of an object not shown. This installation I comprises an electrostatic coating sprayer or spray gun 1 supplied with liquid coating material from a coating product tank 30, via a pipe 31.

Le pistolet 1 est également relié à une source d'air sous pression 40 par un tuyau 41. L'air provenant de la source 40 est utilisé pour pulvériser le produit de revêtement en l'entrainant à partir du pistolet 1 en direction de l'objet à revêtir.The gun 1 is also connected to a source of pressurized air 40 by a pipe 41. The air from the source 40 is used to spray the coating product by driving it from the gun 1 towards the object to be coated.

On note 2 un logement situé dans un canon 11 du pistolet 1 dans lequel une aiguille 62 coulisse. L'aiguille est destinée à contrôler l'écoulement de produit de revêtement et destinée à être portée à une haute tension afin de charger électriquement le produit de revêtement.Note 2 a housing located in a gun 11 of the gun 1 in which a needle 62 slides. The needle is intended to control the flow of coating material and to be brought to a high voltage in order to electrically charge the coating product.

On note 4 un conduit de circulation de produit de revêtement à l'intérieur du pistolet 1. Ce conduit 4 de circulation du produit de revêtement est raccordé au tuyau 31 par l'intermédiaire d'un connecteur 32, situé à la base d'une poignée 16 du pulvérisateur 1. Le conduit 4 débouche à proximité d'une sortie S de pulvérisation du produit de revêtement au niveau d'une extrémité 63 de l'aiguille 62 qui forme une pointe triangulaire. A la figure 1, l'extrémité 63, est en appui contre un siège 64 de forme correspondante et vient boucher le conduit 4. Ainsi, l'ensemble formé par l'aiguille 62 et le siège 64 correspond à une vanne 6 de contrôle de l'écoulement du produit de revêtement.There is 4 a coating product circulation duct inside the gun 1. This duct 4 for circulation of the coating product is connected to the pipe 31 via a connector 32, located at the base of a Handle 16 of the sprayer 1. The conduit 4 opens near a spray outlet S of the coating material at one end 63 of the needle 62 which forms a triangular tip. To the figure 1 the end 63 is in abutment against a seat 64 of corresponding shape and closes the conduit 4. Thus, the assembly formed by the needle 62 and the seat 64 corresponds to a valve 6 for controlling the flow of the coating product.

On note 5 un conduit de circulation d'air à l'intérieur du pistolet 1. Ce conduit 5 comprend deux tronçons 5a, 5b entre lesquels se trouve une vanne 7 de contrôle de l'écoulement de l'air. Le deuxième tronçon 5b du conduit 5 débouche à la sortie S de pulvérisation du produit de revêtement.There is 5 an air flow duct inside the gun 1. This duct 5 comprises two sections 5a, 5b between which is a valve 7 for controlling the flow of air. The second section 5b of the duct 5 opens at the outlet S spraying the coating product.

Le conduit de circulation d'air 5 est raccordé au tuyau 41 par l'intermédiaire d'un connecteur 42, situé à l'arrière d'un corps 21 du pistolet 1.The air flow duct 5 is connected to the pipe 41 via a connector 42 located at the rear of a body 21 of the gun 1.

La vanne 7 de contrôle de l'écoulement d'air comprend un clapet 72, de forme adaptée pour venir en appui contre un siège 74, de forme correspondante, sous l'effet d'un effort de rappel R exercé par un ressort 22 maintenu en position par un bouchon 23 formant un point fixe d'appui pour ce ressort 22. De manière analogue, l'extrémité 63 de l'aiguille 62 est de forme adaptée pour venir en appui contre le siège 64, de forme correspondante, sous l'effet de l'effort de rappel R.The air flow control valve 7 comprises a valve 72, of a shape adapted to bear against a seat 74, of corresponding shape, under the effect of a return force R exerted by a spring 22 maintained in position by a plug 23 forming a fixed bearing point for this spring 22. Similarly, the end 63 of the needle 62 is shaped to bear against the seat 64, of corresponding shape, under the effect of the R.

Le pistolet 1 est aussi relié à un générateur 8 par un câble électrique 9 qui permet d'alimenter en courant une unité haute tension 10, disposée dans le canon 11 du pistolet 1. Le générateur 8 est lui-même alimenté en courant à partir du secteur, au moyen d'un câble 82.The gun 1 is also connected to a generator 8 by an electric cable 9 which supplies power to a high voltage unit 10 disposed in the barrel 11 of the gun 1. The generator 8 is itself supplied with current from the sector, by means of a cable 82.

On note 12 un module de contrôle du courant d'alimentation délivré à l'unité haute tension 10 par le générateur 8. Ce module de contrôle 12 est compris dans le générateur 8. Lorsqu'elle est alimentée par le générateur 8, l'unité haute tension 10 génère une haute tension continue appliquée à l'extrémité 63 de l'aiguille 62 qui charge électriquement par ionisation le produit de revêtement pulvérisé au niveau de la sortie S. Ainsi, l'unité haute tension est propre, en réponse à son alimentation par le générateur 8, également appelé alimentation en courant 8, à générer une haute tension continue et à appliquer la haute tension à l'extrémité 63 de l'aiguille 62.Note 12 a control module of the supply current delivered to the high voltage unit 10 by the generator 8. This control module 12 is included in the generator 8. When it is powered by the generator 8, the unit high voltage 10 generates a high DC voltage applied to the end 63 of the needle 62 which electrically charges by ionization the sprayed coating product at the outlet S. Thus, the high voltage unit is clean, in response to its supply by the generator 8, also called power supply 8, to generate a high DC voltage and to apply the high voltage to the end 63 of the needle 62.

Avantageusement, l'unité haute tension est propre, en réponse à son alimentation par le générateur 8, à générer une haute tension continue et à appliquer la haute tension à une électrode de charge, non représentée, positionnée au niveau de la sortie S, à proximité de l'extrémité 63. Le produit de revêtement est ainsi chargé électriquement.Advantageously, the high voltage unit is clean, in response to its supply by the generator 8, to generate a high DC voltage and to apply the high voltage to a charging electrode, not shown, positioned at the output S, at near the end 63. The coating product is thus electrically charged.

Une gâchette 15 est articulée sur le corps 21 du pistolet 1 autour d'un axe X2 globalement perpendiculaire à un axe longitudinal du canon Y2 et permet l'ouverture et la fermeture de la vanne d'air et le mouvement de l'aiguille 62 selon une direction parallèle à l'axe Y2. Plus précisément, la gâchette 15 comprend une extension 152 en appui contre le clapet 72, ce qui permet d'exercer sur le clapet 72 un effort opposé à l'effort de rappel R pour décaler axialement, le long de l'axe Y2, le clapet 72 par rapport à son siège 74. L'extension 152 est donc propre à exercer sur le clapet 72 un effort opposé à l'effort de rappel R pour décaler axialement, le long de l'axe longitudinal Y2, le clapet 72 par rapport au siège 74. De la même manière, l'aiguille 62 est rattachée à l'extension 152, ce qui permet d'exercer sur l'aiguille 62 un effort opposé à l'effort de rappel R pour décaler axialement, le long de l'axe Y2, l'aiguille 62 et plus précisément son extrémité 63 par rapport à son siège 64. L'extension 152 est donc propre à exercer sur l'aiguille 62 un effort opposé à l'effort de rappel R pour décaler axialement, le long de l'axe longitudinal Y2, l'aiguille 62 par rapport au siège 64. Lorsqu'on relâche la poignée 15, le ressort 22 repousse l'aiguille 62 et le clapet 72 vers la position d'interruption des conduits 4 et 5 représentée à la figure 1. La gâchette 15 permet ainsi de contrôler la circulation de produit de revêtement et d'air sous pression dans les conduits 4, 5.A trigger 15 is articulated on the body 21 of the pistol 1 about an axis X2 generally perpendicular to a longitudinal axis of the barrel Y2 and allows the opening and closing of the air valve and the movement of the needle 62 according to a direction parallel to the axis Y2. More specifically, the trigger 15 comprises an extension 152 in support against the valve 72, which allows to exert on the valve 72 a force opposite to the return force R to shift axially along the axis Y2, the valve 72 relative to its seat 74. The extension 152 is therefore able to exert on the valve 72 a force opposite to the return force R to shift axially along the longitudinal axis Y2, the valve 72 relative to the seat 74. In the same way, the needle 62 is attached to the extension 152, which allows to exert on the needle 62 a force opposite to the return force R to shift axially along the axis Y2, the needle 62 and more precisely its end 63 with respect to its seat 64. The extension 152 is thus able to exert on the needle 62 a force opposite to the return force R to shift axially along the longitudinal axis Y2, the needle 62 by relative to the seat 64. When the handle 15 is released, the spring 22 pushes the needle 62 and the valve 72 towards the interruption position of s ducts 4 and 5 shown in figure 1 . The trigger 15 thus makes it possible to control the circulation of coating product and air under pressure in the conduits 4, 5.

Un capteur 17 est positionné dans le corps 21 à proximité de l'aiguille 62 et détecte le mouvement de l'aiguille 62 lorsque la gâchette 15 est actionnée. Ce capteur 17 peut être de tout type adapté à sa fonction et, notamment, un capteur Reed. En variante, il s'agit d'un capteur capacitif ou inductif ou d'un capteur à effet Hall, ou d'un détecteur de champ magnétique. Lorsque l'opérateur agit sur la gâchette 15 et exerce un effort représenté par la flèche F15, l'extrémité 63 de l'aiguille 62 est décollée du siège 64 et un écoulement de produit de revêtement se produit à travers le conduit 4. Dans le même temps, le clapet 72 de la vanne 7 d'air est décollé du siège 74 et un écoulement d'air se produit à travers le conduit 5 de circulation d'air. Ainsi un écoulement d'air et de produit de revêtement se produit en direction de la sortie S.A sensor 17 is positioned in the body 21 near the needle 62 and detects the movement of the needle 62 when the trigger 15 is actuated. This sensor 17 can be of any type adapted to its function and, in particular, a Reed sensor. Alternatively, it is a capacitive or inductive sensor or a Hall effect sensor, or a magnetic field detector. When the operator acts on the trigger 15 and exerts a force represented by the arrow F15, the end 63 of the needle 62 is detached from the seat 64 and a flow of coating product occurs through the conduit 4. In the At the same time, the valve 72 of the air valve 7 is detached from the seat 74 and an air flow occurs through the air flow duct 5. Thus a flow of air and coating product occurs towards the S output.

Le capteur 17 est relié au module de contrôle 12 par l'intermédiaire d'un câble 13.The sensor 17 is connected to the control module 12 via a cable 13.

En outre, un second capteur 18 est positionné à proximité d'un interrupteur 19 positionné sur le corps 21 du pistolet 1. L'opérateur peut changer manuellement la position de l'interrupteur 19 sachant que le capteur 18 est apte à détecter la position de l'interrupteur 19. Le capteur 18 peut être du même type que le capteur 17 ou d'un autre type.In addition, a second sensor 18 is positioned near a switch 19 positioned on the body 21 of the gun 1. The operator can manually change the position of the switch 19 knowing that the sensor 18 is able to detect the position of the switch 19. The sensor 18 may be of the same type as the sensor 17 or of another type.

Le câble 13 comprend un premier tronçon 13a qui s'étend entre le module de contrôle 12 et le capteur 17, un deuxième tronçon 13b qui s'étend entre les capteurs 17 et 18 et un troisième tronçon 13c qui s'étend entre le capteur 18 et le module de contrôle 12. Ainsi, les capteurs 17 et 18 sont reliés en série au module de contrôle 12, à travers le câble 13. Les capteurs 17 et 18 sont, par exemple, montés sur un circuit imprimé, non représenté et surmoulés dans une résine isolante électriquement.The cable 13 comprises a first section 13a which extends between the control module 12 and the sensor 17, a second section 13b which extends between the sensors 17 and 18 and a third section 13c which extends between the sensor 18 and the control module 12. Thus, the sensors 17 and 18 are connected in series to the control module 12, through the cable 13. The sensors 17 and 18 are, for example, mounted on a printed circuit, not shown and overmolded in an electrically insulating resin.

L'interrupteur 19 est destiné à être manipulé par l'opérateur pour passer d'une première configuration « électrostatique » du pistolet où la haute tension est appliquée à l'extrémité 63 de l'aiguille 62 à une deuxième configuration « purement pneumatique » où l'unité 10 n'est pas alimentée. Cette deuxième configuration est utile pour revêtir certains objets creux ou de forme complexe.The switch 19 is intended to be manipulated by the operator to pass from a first "electrostatic" configuration of the gun where the high voltage is applied to the end 63 of the needle 62 to a second "purely pneumatic" configuration where the unit 10 is not powered. This second configuration is useful for coating certain hollow or complex shape objects.

Par ailleurs, le ressort 22 est en matériau amagnétique il ne perturbe donc pas la détection de mouvement effectué par les capteurs 18, 17 dans le cas où les capteurs 17, 18 sont des capteurs Reed et, plus généralement, des capteurs de type magnétique.Moreover, the spring 22 is made of non-magnetic material so it does not disturb the motion detection performed by the sensors 18, 17 in the case where the sensors 17, 18 are Reed sensors and, more generally, sensors of the magnetic type.

La liaison série entre le capteur 17, le capteur 18 et le module de contrôle 12 permet d'adresser au module de contrôle 12 un signal S1 représentatif du mouvement de l'aiguille 62 et de la position de l'interrupteur 19. Le module de contrôle 12 contrôle l'alimentation en courant de l'unité haute tension 10 en fonction de la valeur du signal S1 reçu.The serial link between the sensor 17, the sensor 18 and the control module 12 makes it possible to send to the control module 12 a signal S1 representative of the movement of the needle 62 and the position of the switch 19. control 12 controls the power supply of the high voltage unit 10 as a function of the value of the received signal S1.

Les capteurs 17 et 18 sont positionnés dans une zone A du corps 21 qui est étanche afin qu'aucune impureté ne vienne perturber leur fonctionnement. En configuration d'utilisation du pistolet 1 représentée à la figure 1, la zone A est située au dessus de la vanne 7 et de l'aiguille 62, en partie supérieure du corps 21, ce qui facilite l'accès à l'interrupteur 19.The sensors 17 and 18 are positioned in a zone A of the body 21 which is sealed so that no impurity disrupts their operation. In the use configuration of the pistol 1 shown in FIG. figure 1 Zone A is located above the valve 7 and the needle 62, in the upper part of the body 21, which facilitates access to the switch 19.

Afin de commander l'unité haute tension 10, l'installation de projection électrostatique détecte un mouvement de l'aiguille 62 et tient compte d'un éventuel changement de position de l'interrupteur 19.In order to control the high voltage unit 10, the electrostatic projection installation detects a movement of the needle 62 and takes into account any change of position of the switch 19.

Dans le cas où les capteurs 17 et 18 sont des capteurs Reed, ils sont disposés dans la partie A du corps 21 pour être fermés lorsque l'aiguille 62 est décalée du siège 64 et lorsque l'interrupteur 19 est dans une première position ON correspondant à la configuration « électrostatique » du pistolet 1. Ainsi, lorsque l'opérateur actionne la gâchette 15 alors que l'interrupteur 19 est dans sa première position, le câble 13 forme une boucle électrique ininterrompue, ce qui peut être détecté par le module de contrôle 12 qui injecte un signal sur ce câble et qui le récupère sous la forme du signal S1. Dans ce cas, le module de contrôle 12 pilote le générateur 8 pour alimenter l'unité 10. Dans le cas où l'un des capteurs 17, 18 est ouvert, c'est-à-dire si l'aiguille 62 et plus particulièrement son extrémité 63 est en appui sur le siège 64 ou si l'interrupteur 19 est dans une seconde position OFF correspondant à la configuration « purement pneumatique » du pistolet, la boucle formée par le câble 13 est interrompue et le signal S1 récupéré est nul. Dans ce cas, le module de contrôle 12 pilote le générateur 8 pour ne pas alimenter l'unité 10.In the case where the sensors 17 and 18 are Reed sensors, they are arranged in the part A of the body 21 to be closed when the needle 62 is shifted from the seat 64 and when the switch 19 is in a first ON position corresponding to the "electrostatic" configuration of the gun 1. Thus, when the operator actuates the trigger 15 while the switch 19 is in its first position, the cable 13 forms an uninterrupted electrical loop, which can be detected by the module of control 12 which injects a signal on this cable and which retrieves it in the form of signal S1. In this case, the control module 12 drives the generator 8 to power the unit 10. In the case where one of the sensors 17, 18 is open, that is to say if the needle 62 and more particularly its end 63 is supported on the seat 64 or if the switch 19 is in a second OFF position corresponding to the "purely pneumatic" configuration of the gun, the loop formed by the cable 13 is interrupted and the signal S1 recovered is zero. In this case, the control module 12 drives the generator 8 so as not to supply the unit 10.

D'autres façons de transmettre le signal S1 au module de contrôle 12 sont envisageables, notamment en fonction du type des capteurs 17 et 18.Other ways of transmitting the signal S1 to the control module 12 are possible, in particular depending on the type of the sensors 17 and 18.

Dans tous les cas, un signal S1 correspondant au mouvement de la vanne 6 de produit de revêtement, et plus précisément de l'aiguille 62, et à la position de l'interrupteur 19 est transmis au module de contrôle 12 par l'intermédiaire du câble 13 adapté au type de capteur utilisé. Le module de contrôle 12 enclenche ou coupe l'alimentation en courant de l'unité haute tension 10 en fonction du signal S1 reçu.In all cases, a signal S1 corresponding to the movement of the coating material valve 6, and more precisely of the needle 62, and to the position of the switch 19 is transmitted to the control module 12 via the cable 13 adapted to the type of sensor used. The control module 12 switches on or off the power supply of the high voltage unit 10 as a function of the signal S1 received.

Lorsque l'interrupteur 19 est en position OFF le signal S1 envoyé par le capteur 18 au module de contrôle 12 déclenche la coupure de l'alimentation de l'unité haute tension 10 par le générateur 8. Cette coupure est maintenue jusqu'à ce que l'interrupteur 19 soit en position ON, elle permet par exemple à l'opérateur de revêtir plus facilement des corps creux en évitant des phénomènes de contre émission ou de cage de Faraday.When the switch 19 is in the OFF position, the signal S1 sent by the sensor 18 to the control module 12 triggers the cut-off of the supply of the high voltage unit 10 by the generator 8. This cut is maintained until switch 19 is in the ON position, it allows for example the operator to more easily coat hollow bodies avoiding counter-emission phenomena or Faraday cage.

Lorsque l'interrupteur 19 est en position ON la coupure ou l'enclenchement de l'alimentation de l'unité haute tension 10 par le générateur 8 dépend de la position de l'aiguille 62 de la vanne 6 de produit de revêtement. Si le déplacement détecté correspond à une course supérieure à une valeur de référence, alors le signal S1 envoyé par le capteur 17 au module de contrôle 12 induit l'enclenchement de l'alimentation de l'unité haute tension et, dans le cas contraire, le signal S1 envoyé par le capteur 17 induit la coupure ou le non-enclenchement de l'alimentation de l'unité haute tension.When the switch 19 is in the ON position, the breaking or switching on of the supply of the high voltage unit 10 by the generator 8 depends on the position of the needle 62 of the coating product valve 6. If the displacement detected corresponds to a stroke greater than a reference value, then the signal S1 sent by the sensor 17 to the control module 12 induces the switching on of the supply of the high voltage unit and, if not, the signal S1 sent by the sensor 17 induces the cutting or non-engagement of the supply of the high voltage unit.

En variante, le capteur 17 détecte un mouvement du clapet 72 de la vanne 7 d'air et non un mouvement de l'aiguille 62 de la vanne 6. Le fonctionnement reste identique à celui présenté précédemment.Alternatively, the sensor 17 detects a movement of the valve 72 of the air valve 7 and not a movement of the needle 62 of the valve 6. The operation remains identical to that presented above.

Selon une autre variante ne faisant pas partie de l'invention, le pulvérisateur peut comprendre uniquement un capteur 17 et pas de capteur 18 ni d'interrupteur 19. Dans ce cas, l'enclenchement de la haute tension ne peut pas être coupé manuellement par l'opérateur et dépend uniquement du mouvement de la vanne 7 ou de la vanne 6.According to another variant not forming part of the invention, the sprayer may comprise only a sensor 17 and no sensor 18 or switch 19. In this case, the engagement of the high voltage can not be cut manually by the operator and depends solely on the movement of the valve 7 or the valve 6.

L'installation représentée à la figure 1 présente un pulvérisateur manuel. L'invention est cependant applicable à un pulvérisateur automatique, auquel cas les vannes sont commandées à distance.The installation represented at figure 1 presents a manual sprayer. The invention is however applicable to an automatic sprayer, in which case the valves are controlled remotely.

Selon une autre variante, le produit de revêtement pulvérisé est pulvérulent, auquel cas, il suffit d'un seul conduit de circulation de produit de revêtement à travers lequel le produit de revêtement pulvérulent est transporté pneumatiquement. On n'a pas besoin d'un conduit de circulation d'air et une seule vanne est utilisée.According to another variant, the sprayed coating product is powdery, in which case only one coating product circulation conduit through which the powder coating product is pneumatically conveyed is required. There is no need for an air flow duct and only one valve is used.

Selon une variante, la liaison entre les capteurs 17, 18 et le module de contrôle 12 est une liaison sans fil. Les capteurs 17, 18 peuvent transmettre le signal S1 au module de contrôle 12 à l'aide d'ondes radioélectriques.According to one variant, the connection between the sensors 17, 18 and the control module 12 is a wireless link. The sensors 17, 18 can transmit the signal S1 to the control module 12 by means of radio waves.

Selon une autre variante, le générateur 8 et alimenté au moyen d'une source autonome.According to another variant, the generator 8 and powered by means of an autonomous source.

Selon une autre variante, le conduit 5 de circulation d'air comprend deux deuxièmes tronçons qui sont positionnés le long du logement de l'aiguille et débouche à la sortie S de part et d'autre de l'aiguille 62.According to another variant, the air circulation duct 5 comprises two second sections which are positioned along the housing of the needle and open at the outlet S on either side of the needle 62.

Les caractéristiques techniques du mode de réalisation et des variantes envisagées ci-dessus peuvent être combinées entre elles pour générer d'autres modes de réalisation.The technical features of the embodiment and variants contemplated above may be combined with one another to generate other embodiments.

Claims (15)

  1. An apparatus (I) for electrostatically spraying a coating product comprising:
    - a sprayer (1) provided with a first pipe (4) and a second pipe (5), respectively for the flow of coating product and air, in which the flow of coating product and air is controlled by at least one valve (6, 7), said sprayer also comprising means (15) for controlling the opening/closing of the valve and a high-voltage unit (10),
    - a high-voltage unit power supply (10) generator (8), said generator comprising a control module (12) for controlling the current delivered to the high-voltage unit.
    the sprayer (1) comprising at least one first sensor (17) able to detect the position of a shutter (62, 72) of the valve (6, 7) relative to a seat (64, 74) and outputting a signal (S1) that can be used by the control module (12) to control the current supplying of the high-voltage unit (10),
    characterized in that the sprayer comprises a second sensor (18) able to detect the position of a switch (19) positioned on the gun (1) and to deliver a signal (S1) that can be used by the control module (12) to control the current supplying (8) of the high-voltage unit (10).
  2. The apparatus according to claim 1, characterized in that the sprayer comprises a first valve (6) controlling the flow of coating product in the first pipe (4) and a second valve (7) controlling the flow of air between two segments (5a, 5b) of the second pipe (5), and in that the first sensor (17) is able to detect the position of a shutter (62) of the first valve (6).
  3. The apparatus according to claim 1, characterized in that the sprayer comprises a first valve (6) controlling the flow of coating product in the first pipe (4) and a second valve (7) controlling the flow of air between two segments (5a, 5b) of the second pipe (5), and in that the first sensor (17) is able to detect the position of a shutter (72) of the second valve (7).
  4. The apparatus according to claim 2 or 3, characterized in that the first valve (6) controlling the flow of coating product comprises a shutter (62) forming a needle (62) sliding in a barrel (11) of the sprayer (1), designed to control the flow of coating product and designed to be brought to a high voltage, to electrically charge the coating product.
  5. The apparatus according to one of the preceding claims, characterized in that the sprayer (1) comprises a spring (22) made from a nonmagnetic material that exerts a return force (R) on the shutter (62, 72) of the valve (6, 7).
  6. The apparatus according to claims 4 and 5, characterized in that the needle (62) comprises an end (63) with a shape suitable for bearing against a seat (64) of the first valve (6) with a corresponding shape under the effect of the return force (R).
  7. The apparatus according to claim 6, characterized in that the high-voltage unit (10) is positioned in the barrel (11) of the sprayer (1) and is able, in response to the supply of the high-voltage unit (10) by the power source (8), to generate a direct high voltage and to apply the high voltage to the end (63) of the needle.
  8. The apparatus according to claim 7, characterized in that the switch (19) is designed to be manipulated by an operator to go from a first configuration of the sprayer (1), where the high voltage is applied to the end (63) of the needle (62), to a second configuration, where the high-voltage unit (10) is not supplied with electricity.
  9. The apparatus according to one of claims 2 to 4 and according to any one of claims 5 or 8, characterized in that the second valve (7) controlling the flow of air comprises a shutter (72), with a suitable shape for bearing against a seat (74) of the second valve (7) with a corresponding shape, under the effect of the return force (R).
  10. The apparatus according to one of the preceding claims, characterized in that a trigger (15) is articulated on a body (21) of the sprayer around an axis (X2) globally perpendicular to a longitudinal axis (Y2) of a barrel (11) of the sprayer (1).
  11. The apparatus according to claims 10 and 5, characterized in that the trigger (15) comprises an extension (152), bearing against the shutter (62, 72) of the valve (6, 7) and able to exert, on the shutter (62, 72), a force opposite the return force (R), to axially offset the shutter (62, 72) of the valve, along the longitudinal axis (Y2), relative to the seat (64,74).
  12. The apparatus according to one of the preceding claims, characterized in that the first and second sensors (17, 18) are mounted in series on a cable (13) connecting those sensors to the control module (12).
  13. The apparatus according to one of the preceding claims, characterized in that the first sensor (17) is a Reed sensor or a Hall effect sensor.
  14. The apparatus according to one of the preceding claims, characterized in that the sprayer comprises a tight zone (A) within which the sensor(s) (17, 18) are positioned.
  15. A method for controlling a power supply generator (8) of a high-voltage unit (10) comprised in an apparatus (1) for electrostatically spraying a coating product, characterized in that it further comprises the following steps:
    - a) detecting the position of a shutter (62, 72) of a valve (6, 7) comprised in the sprayer and setting in motion using its opening/closing means (15), on the one hand, and changing the position of a switch (19) fastened on the gun on the other hand;
    - b) sending a signal (S1) corresponding to the position of the valve (6, 7) and the position of the switch (19) to a control module (12) of the generator (8) by means of a connection (2) suitable for the type of sensor used;
    - c) controlling the cut-off or triggering of the generator (8), based on the received signal (S1) and using the control module (12).
EP14719651.3A 2013-04-09 2014-04-08 Apparatus for electrostatically spraying a coating product and method for controlling generator for supplying power to a high voltage unit in such an apparatus Active EP2983831B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1353185A FR3004127B1 (en) 2013-04-09 2013-04-09 INSTALLATION FOR ELECTROSTATIC PROJECTION OF COATING PRODUCT AND METHOD FOR CONTROLLING A POWER SUPPLY GENERATOR FROM A HIGH VOLTAGE UNIT IN SUCH AN INSTALLATION
PCT/EP2014/056980 WO2014166902A1 (en) 2013-04-09 2014-04-08 Apparatus for electrostatically spraying a coating product and method for controlling generator for supplying power to a high voltage unit in such an apparatus

Publications (2)

Publication Number Publication Date
EP2983831A1 EP2983831A1 (en) 2016-02-17
EP2983831B1 true EP2983831B1 (en) 2017-06-07

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EP14719651.3A Active EP2983831B1 (en) 2013-04-09 2014-04-08 Apparatus for electrostatically spraying a coating product and method for controlling generator for supplying power to a high voltage unit in such an apparatus

Country Status (10)

Country Link
US (1) US9669417B2 (en)
EP (1) EP2983831B1 (en)
JP (1) JP6342989B2 (en)
KR (1) KR102210669B1 (en)
CN (1) CN105163863B (en)
BR (1) BR112015025382A2 (en)
ES (1) ES2638418T3 (en)
FR (1) FR3004127B1 (en)
RU (1) RU2640782C2 (en)
WO (1) WO2014166902A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10640280B2 (en) * 2017-04-05 2020-05-05 Meritool Llc Trigger assembly and method of operation
CN108393206A (en) * 2018-05-08 2018-08-14 杭州福路涂装设备有限公司 A kind of automatically controlled spray gun of external seal

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Publication number Priority date Publication date Assignee Title
JPS57123657U (en) * 1981-01-26 1982-08-02
US4441656A (en) * 1982-01-29 1984-04-10 J. Wagner Ag Electrostatic disabling switch for electrostatic spray guns
DE3507965C1 (en) 1985-03-06 1986-04-03 Ransburg-Gema AG, St.Gallen Electrostatic spray gun for coating material
DE3545885C1 (en) * 1985-12-23 1993-03-04 Kopperschmidt Mueller & Co Electrostatic spray gun
DE3904437A1 (en) * 1989-02-14 1990-08-16 Gema Ransburg Ag SPRAY GUN FOR ELECTROSTATIC SPRAY COATING
US5080289A (en) * 1990-05-25 1992-01-14 Graco Inc. Spraying voltage control with hall effect switches and magnet
JP2502344Y2 (en) * 1992-07-22 1996-06-19 旭サナック株式会社 Open / close valve opening / closing device for spray gun for painting
US5765761A (en) * 1995-07-26 1998-06-16 Universtiy Of Georgia Research Foundation, Inc. Electrostatic-induction spray-charging nozzle system
GB9604329D0 (en) * 1996-02-29 1996-05-01 Ici Plc Electrostatic spraying
JP4326238B2 (en) * 2003-03-11 2009-09-02 努 高橋 Air spray device
CN2605075Y (en) * 2003-03-14 2004-03-03 成都飞亚粉末涂料涂装实业有限公司 Electrostatic spraying gun
FR2883775B1 (en) * 2005-04-04 2007-06-15 Sames Technologies Soc Par Act ELECTROSTATIC PROJECTION INSTALLATION OF COATING PRODUCT AND METHOD FOR CONTROLLING THE POWER SUPPLY OF HIGH VOLTAGE LIFTING MEANS IN SUCH A INSTALLATION
US20080217437A1 (en) * 2007-03-06 2008-09-11 Spraying Systems Co. Optimized Method to Drive Electric Spray Guns
US8584973B2 (en) * 2007-10-31 2013-11-19 Nordson Corporation Powder coating gun with manually operated controls on gun
FR2941877B1 (en) * 2009-02-09 2011-04-08 Sames Technologies ELECTROSTATIC PROJECTOR HAVING A ROTATION SPEED DETECTION DEVICE

Also Published As

Publication number Publication date
JP6342989B2 (en) 2018-06-13
FR3004127A1 (en) 2014-10-10
US9669417B2 (en) 2017-06-06
CN105163863A (en) 2015-12-16
KR102210669B1 (en) 2021-02-02
CN105163863B (en) 2017-06-06
BR112015025382A2 (en) 2017-07-18
FR3004127B1 (en) 2020-05-01
RU2640782C2 (en) 2018-01-11
WO2014166902A1 (en) 2014-10-16
US20160051998A1 (en) 2016-02-25
ES2638418T3 (en) 2017-10-20
RU2015147914A (en) 2017-05-12
EP2983831A1 (en) 2016-02-17
JP2016514619A (en) 2016-05-23
KR20150138245A (en) 2015-12-09

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