EP2983831B1 - Vorrichtung zum elektrostatischen besprühen eines beschichtungsprodukts und verfahren zur generatorsteuerung zur stromversorgung einer hochspannungseinheit in solch einer vorrichtung - Google Patents

Vorrichtung zum elektrostatischen besprühen eines beschichtungsprodukts und verfahren zur generatorsteuerung zur stromversorgung einer hochspannungseinheit in solch einer vorrichtung 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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Prior art keywords
valve
sprayer
sensor
voltage unit
coating product
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EP14719651.3A
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English (en)
French (fr)
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EP2983831A1 (de
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.

Landscapes

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

Claims (15)

  1. Elektrostatische Sprühvorrichtung (I) für ein Beschichtungsmaterial, umfassend:
    - eine Zerstäubungsvorrichtung (1), die mit einem ersten Kanal (4) und einem zweiten Kanal (5) jeweils zur Zirkulation des Beschichtungsmaterials und Luft versehen ist, in denen die Zirkulation des Beschichtungsmaterials und der Luft von mindestens einem Ventil (6, 7) gesteuert wird, wobei diese Zerstäubungsvorrichtung ebenfalls Mittel (15) zur Steuerung des Öffnens/Schließens des Ventils und eine Hochspannungseinheit (10) umfasst,
    - einen Generator (8) zur Stromversorgung der Hochspannungseinheit (10), wobei der Generator ein Steuermodul (12) des an die Hochspannungseinheit gelieferten Versorgungsstroms umfasst,
    wobei die Zerstäubungsvorrichtung (1) mindestens einen ersten Sensor (17) umfasst, der geeignet ist, die Position eines Ventilkörpers (62, 72) des Ventils (6, 7) in Bezug auf einen Sitz (64, 74) zu detektieren und ein von dem Steuermodul (12) auswertbares Signal (S1) zum Steuern der Stromversorgung der Hochspannungseinheit (10) zu liefern, dadurch gekennzeichnet, dass die Zerstäubungsvorrichtung einen zweiten Sensor (18) umfasst, der geeignet ist, die Position eines an der Pistole (1) positionierten Schalters (19) zu detektieren und ein von dem Steuermodul (12) auswertbares Signal (S1) zu liefern, um die Stromversorgung (8) der Hochspannungseinheit (10) zu steuern.
  2. Anlage nach Anspruch 1, dadurch gekennzeichnet, dass die Zerstäubungsvorrichtung ein erstes Ventil (6) zur Steuerung der Strömung des Beschichtungsmaterials in dem ersten Kanal (4) und ein zweites Ventil (7) zur Steuerung der Strömung der Luft zwischen zwei Abschnitten (5a, 5b) des zweiten Kanals (5) umfasst, und dass der erste Sensor (17) geeignet ist, die Position eines Ventilkörpers (62) des ersten Ventils (6) zu detektieren.
  3. Anlage nach Anspruch 1, dadurch gekennzeichnet, dass die Zerstäubungsvorrichtung ein erstes Ventil (6) zur Steuerung der Strömung des Beschichtungsmaterials in dem ersten Kanal (4) und ein zweites Ventil (7) zur Steuerung der Strömung der Luft zwischen zwei Abschnitten (5a, 5b) des zweiten Kanals (5) umfasst, und dass der erste Sensor (17) geeignet ist, die Position eines Ventilkörpers (72) des zweiten Ventils (7) zu detektieren.
  4. Anlage nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das erste Ventil (6) zur Steuerung der Strömung des Beschichtungsmaterials einen eine Nadel (62) bildenden Ventilkörper (62) umfasst, die in einem Lauf (11) der Zerstäubungsvorrichtung (1) gleitet und vorgesehen ist, die Strömung des Beschichtungsmaterials zu steuern und vorgesehen ist, auf eine Hochspannung gebracht zu werden, um elektrisch das Beschichtungsmaterial aufzuladen.
  5. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Zerstäubungsvorrichtung (1) eine Feder (22) aus nichtmagnetischem Material umfasst, die eine Rückstellkraft (R) auf den Ventilkörper (62, 72) des Ventils (6, 7) ausübt.
  6. Anlage nach den Ansprüchen 4 und 5, dadurch gekennzeichnet, dass die Nadel (62) ein Ende (63) mit einer Form umfasst, die angepasst ist, sich gegen einen Sitz (64) des ersten Ventils (6) mit korrespondierender Form unter der Wirkung der Rückstellkraft (R) in Anlage zu kommen.
  7. Anlage nach Anspruch 6, dadurch gekennzeichnet, dass die Hochspannungseinheit (10) in dem Lauf (11) der Zerstäubungsvorrichtung (1) angeordnet ist und geeignet ist, eine Gleichhochspannung abhängig von der Versorgung der Hochspannungseinheit (10) durch die Stromversorgung (8) zu erzeugen und die Hochspannung auf das Ende (63) der Nadel aufzubringen.
  8. Anlage nach Anspruch 7, dadurch gekennzeichnet, dass der Schalter (19) vorgesehen ist, von einer Bedienperson betätigt zu werden, um von einer ersten Konfiguration der Zerstäubungsvorrichtung (1), in der die Hochspannung auf das Ende (63) der Nadel (62) aufgebracht wird, in eine zweite Konfiguration überzugehen, in der die Hochspannungseinheit (10) nicht elektrisch versorgt wird.
  9. Anlage nach einem beliebigen der Ansprüche 2 bis 4 und nach einem beliebigen der Ansprüche 5 oder 8, dadurch gekennzeichnet, dass das zweite Ventil (7) zur Steuerung der Strömung der Luft einen Ventilkörper (72) einer Form, die geeignet ist, sich gegen den Sitz (74) des zweiten Ventils (7) mit korrespondierender Form unter der Wirkung der Rückstellkraft (R) abzustützen, umfasst.
  10. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Abzug (15) an einem Körper (21) der Zerstäubungsvorrichtung um eine Achse (X2) im Wesentlichen senkrecht zur Längsachse (Y2) eines Laufs (11) der Zerstäubungsvorrichtung (1) angelenkt ist.
  11. Anlage nach den Ansprüche 10 und 5, dadurch gekennzeichnet, dass der Abzug (15) eine Abzweigung (152) in Anlage gegen den Ventilkörper (62, 72) des Ventils (6, 7) umfasst, die geeignet ist, auf den Ventilkörper (62, 72) eine Kraft entgegengesetzt zur Rückstellkraft (R) auszuüben, um axial den Ventilkörper (62, 72) des Ventils in Bezug auf den Sitz (64, 74) entlang der Längsachse (Y2) zu verschieben.
  12. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste und zweite Sensor (17, 18) in Reihe in einer Leitung (13) zur Verbindung dieser Sensoren mit dem Steuermodul (12) angeordnet sind.
  13. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste Sensor (17) eine Reed-Sensor oder ein Hall-Sensor ist.
  14. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Zerstäubungsvorrichtung eine abgedichtete Zone (A) umfasst, in der der oder die Sensoren (17, 18) positioniert sind.
  15. Verfahren zur Steuerung eines Generators (8) zur Stromversorgung einer Hochspannungseinheit (10), die in einer elektrostatischen Zerstäubungsvorrichtung (1) für Beschichtungsmaterial umfasst ist, dadurch gekennzeichnet, dass es die Schritte umfasst, die darin bestehen:
    - a) einerseits die Position eines Ventilkörpers (62, 72) eines Ventils (6, 7), das in der Zerstäubungsvorrichtung umfasst ist und mit Hilfe von Mitteln (15) zum Öffnen/Schließen desselben in Bewegung gesetzt wird, und andererseits die Änderung der Position eines Schalters (19), der an der Pistole befestigt ist, zu detektieren,
    - b) ein Signal (S1) entsprechend der Position des Ventils (6, 7) und der Position des Schalters (19) an ein Steuermodul (12) des Generators (8) über eine an den verwendeten Sensortyp angepasste Verbindung (2) zu übertragen,
    - c) das Abschalten oder Einschalten des Generators (8) abhängig von dem empfangenen Signal (S1) und mittels des Steuermoduls (12) zu steuern.
EP14719651.3A 2013-04-09 2014-04-08 Vorrichtung zum elektrostatischen besprühen eines beschichtungsprodukts und verfahren zur generatorsteuerung zur stromversorgung einer hochspannungseinheit in solch einer vorrichtung Active EP2983831B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1353185A FR3004127B1 (fr) 2013-04-09 2013-04-09 Installation de projection electrostatique de produit de revetement et procede de commande d'un generateur d'alimentation en courant d'une unite haute tension dans une telle installation
PCT/EP2014/056980 WO2014166902A1 (fr) 2013-04-09 2014-04-08 Installation de projection electrostatique de produit de revetement et procede de commande d'un generateur d'alimentation en courant d'une unite haute tension dans une telle installation

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

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

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ES2638418T3 (es) 2017-10-20
KR20150138245A (ko) 2015-12-09
CN105163863B (zh) 2017-06-06
BR112015025382A2 (pt) 2017-07-18
JP2016514619A (ja) 2016-05-23
FR3004127B1 (fr) 2020-05-01
CN105163863A (zh) 2015-12-16
US20160051998A1 (en) 2016-02-25
KR102210669B1 (ko) 2021-02-02
RU2015147914A (ru) 2017-05-12
WO2014166902A1 (fr) 2014-10-16
RU2640782C2 (ru) 2018-01-11
JP6342989B2 (ja) 2018-06-13
FR3004127A1 (fr) 2014-10-10
US9669417B2 (en) 2017-06-06
EP2983831A1 (de) 2016-02-17

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