EP3153239B1 - Verfahren zur herstellung einer pistole zum auftragen eines beschichtungsprodukts, und auftragpistole für ein beschichtungsprodukt - Google Patents

Verfahren zur herstellung einer pistole zum auftragen eines beschichtungsprodukts, und auftragpistole für ein beschichtungsprodukt Download PDF

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Publication number
EP3153239B1
EP3153239B1 EP16192308.1A EP16192308A EP3153239B1 EP 3153239 B1 EP3153239 B1 EP 3153239B1 EP 16192308 A EP16192308 A EP 16192308A EP 3153239 B1 EP3153239 B1 EP 3153239B1
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EP
European Patent Office
Prior art keywords
injector
cap
dimension
gun
segment
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Active
Application number
EP16192308.1A
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English (en)
French (fr)
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EP3153239A1 (de
Inventor
Gilles GOISOT
Laurent Limbert
Philippe Provenaz
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Exel Industries SA
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Exel Industries SA
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Publication of EP3153239A1 publication Critical patent/EP3153239A1/de
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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
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • 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
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/06—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in annular, tubular or hollow conical form
    • 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
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/18—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area using fluids, e.g. gas streams
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B05B7/067—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the liquid outlet being annular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B05B7/0823—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter comprising a rotatable spray pattern adjusting plate controlling the flow rate of the spray shaping gas jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B05B7/083—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter comprising rotatable spray shaping gas jet outlets

Definitions

  • the invention relates to a method of manufacturing a gun for applying a coating product, as well as a gun for applying a coating product.
  • This gun can be of the manual or automatic type and comprises an injector for spraying a jet of product along a spray axis.
  • This jet can be flat or round depending on the type of injector used. This is called a “round jet” or “flat jet” injector.
  • a flat jet gives an impact in the form of a very stretched ellipse, while a round jet gives an impact in the form of a ring or a disc depending on the pressure of the jet.
  • the invention applies more particularly to guns equipped with a “round jet” injector as described in FR-A-3 009 688 .
  • a “round jet” injector gun comprises a cap arranged coaxially around the injector and an annular product ejection passage which is centered on the spray axis and which is delimited between the cap and the nozzle. injector.
  • the gun comprises a so-called spraying compressed air circuit, making it possible to expel air in an axial direction around the jet of product. This so-called spray air then shears the product jet, which makes it possible to atomize the coating product in the form of droplets, the size of which is not homogeneous within the jet.
  • the jet is very unstable, which is why the gun sometimes includes a second compressed air circuit, called an additional air circuit or “vortex” air circuit, allowing compressed air to be expelled. around the jet of product in a direction substantially orthoradial with respect to the spray axis. In this way, the air is expelled around the jet of product in a vortex fashion, which has the effect of stabilizing the jet of product.
  • the droplets of the coating product are confined in a conical volume.
  • the angle of the cone in which the product jet is confined is proportional to the width of the product jet and therefore to the diameter of the impact at a given application distance.
  • the angle of the cone can be adjusted by modifying the flow rate and / or the pressure of the air circulating in the “vortex” air circuit.
  • the painter can then adjust the dimension of the impact on the part to be coated according to its geometry. For example, the painter needs a larger impact for a large-scale room, like a truck cab, than for a rearview mirror.
  • the pressure of the spraying air is chosen to be relatively high, all the more so when the product to be sprayed is viscous.
  • this causes an “overspray” phenomenon which results in a projection of product outside the desired impact and therefore in an ill-defined impact geometry, which is why this technique cannot be used for very viscous products, for example with a viscosity greater than 120 centipoise.
  • the additional so-called “vortex” air flow becomes less effective the higher the atomizing air pressure. There is then an overconsumption of compressed air in the additional circuit.
  • the invention more particularly intends to remedy by proposing a method making it possible to manufacture a gun capable of projecting a coating product with a well-defined impact and good aesthetic appearance, without having to resort to compressed air. under high pressure in the atomizing air circuit.
  • the invention relates to a method of manufacturing a gun for applying a coating product, this gun comprising an injector for spraying a round jet along a spray axis and a cap arranged coaxially around the nozzle. injector, this cap being designed to form an air space around the jet.
  • this method comprises a step a) consisting in dimensioning an axial projection dimension of the injector with respect to the cap as a function of the diameter of the injector.
  • the impact is well defined because there is little or no “overspray” phenomenon resulting from the use of compressed air under high pressure in the atomizing air circuit. This therefore makes it possible to consume less compressed air in the spraying air circuit and it becomes possible to spray particularly viscous products, for example products whose viscosity reaches 160 centipoise.
  • the impact is well defined, there is less soiling and therefore less cleaning to be done.
  • the additional air flow retains its efficiency for adjusting the diameter of the impact and stabilizing the product jet.
  • US-A-1,757,573 teaches that the value of the dimension of axial protrusion of the injector with respect to the cap influences the suction that can be created by the jet of air leaving the injector. In particular, it can be observed that a maximum depression is obtained in the configuration of FIG. 12. US-A-1,757,573 therefore teaches to size the dimension of the protrusion of the injector relative to the cap as a function of the intensity of the desired suction inside the paint duct. This therefore has nothing to do with sizing in relation to the diameter of the injector.
  • the invention also relates to a gun for applying a coating product, comprising an injector for projecting a round jet along an axis of spraying, and a cap arranged coaxially around the injector, provided to form an air space around the jet.
  • the injector projects axially relative to the cap, while the dimension of axial projection of the injector relative to the cap can be adjusted between a minimum value and a maximum value determined as a function of the diameter of the injector.
  • the cap is axially movable in translation relative to a body of the gun.
  • the gun comprises means for automatically moving the cap in translation relative to the injector.
  • the value of the dimension of axial projection of the injector with respect to the cap also has an influence on the diameter of the impact for a “round jet” injector. Thanks to the new gun, it is therefore possible to adjust the diameter of the impact of the jet sprayed by the gun without modifying the flow rate and / or the pressure of the air circulating in the additional air circuit, which makes it possible to limit compressed air consumption.
  • the compressed air circulating in the additional air circuit then has a minimum flow rate to stabilize the product jet.
  • the coating product is paint, in powder or liquid form.
  • the coating product may be a varnish, a solvent, an ink, or even a lubricant such as oil.
  • the gun 2 comprises a pipe 4 for supplying product, a pipe 8 for supplying compressed air and an electric cable 6 for charging the product electrostatically.
  • the gun 2 also includes a spray head 10, which is best shown in the cross sections of the figures 2 and 3 .
  • the spray head 10 comprises an injector 12 for spraying a jet of product along a spray axis X-X '.
  • the injector 12 is formed by two coaxial parts 12a and 12b which define between them an annular product ejection passage.
  • the injector 12 is shaped to obtain an impact of circular shape.
  • the shape of the impact can be a disc or a ring depending on the pressure of the jet.
  • the injector 12 is therefore a “round jet” injector.
  • D designates the outside diameter of the injector 12.
  • a forward direction denotes an axial direction, that is to say parallel to the axis X-X ', oriented in the direction of spraying, while a rear direction denotes an axial direction facing away from spraying.
  • the front designates a horizontal direction facing left.
  • the injector 12 is mounted on an injector holder 13 which is arranged at the rear relative to the injector 12.
  • the injector holder 13 comprises two coaxial parts which are in one piece.
  • the gun 2 comprises a compressed air circuit known as spraying and a compressed air circuit called additional or “vortex”. These two circuits pass through a body 20 disposed at the rear of the spray head 10 and open into a chamber V14 for forming an air gap around the jet of product.
  • This chamber V14 therefore allows the mixing of the air circulating in the atomizing air circuit and the air circulating in the additional air circuit.
  • This chamber V14 is delimited between the internal coaxial part of the injector holder 13 and a cap 14 arranged coaxially around the injector 12.
  • the front end of the injector 12 projects axially relative to the front end surface of the cap 14 over a distance d, called the dimension of axial protrusion of the injector 12 relative to the cap 14.
  • the cap 14 comprises an inner surface S14 guiding the compressed air towards the outlet, that is to say around the injector 12.
  • This surface S14 is frustoconical and converges, with respect to the spray axis XX 'and in the direction of spraying, with an angle of convergence A14 of between 15 ° and 60 °, in particular equal to 54 °.
  • the injector holder 13 is screwed onto a block 16 which is immobilized axially relative to the rear body 20 by means of an outer clamping ring 24.
  • This ring 24 is screwed onto the rear body 20 and is linked in translation with the block. 16 by axial cooperation between an annular end flange belonging to the ring 24 and an external radial shoulder of the block 16.
  • a needle 18 made of a stainless metal alloy is axially movable inside the body 20 and inside the block 16 in contact with a seat 26 housed in the block 16 in order to selectively cut off the supply to the injector. 12 as a coating product. Needle 18 may also be known as a needle. In the configuration of the figure 2 , the needle 18 is in contact with the seat 26, thus cutting off the supply of the injector 12 with coating product.
  • the gun 2 comprises a member 40 for guiding the needle 18 in translation along the axis X-X '. This guide member is a pad 40 which is housed partly inside the block 16 and partly inside the body 20.
  • the cap 14 is immobilized relative to the body 20 by means of an outer locking ring 22.
  • This ring 22 is screwed onto the body 20 and is linked in translation with the cap 14 by cooperation between an internal radial lip of the ring 22 and an outer radial rim of the cap 14. More precisely, the ring 22 is screwed around the body 20 until the cap 14 is placed in a tight or nominal position, in which it no longer moves relative to the body 20. In the clamped position, the dimension d of axial protrusion of the injector 12 relative to the cap 14 is fixed. It is then not possible to adjust the dimension d, that is to say loosen the ring 22, because the cap 14 would then present an axial play which is harmful to the operation of the gun 2.
  • the atomizing air circuit comprises a duct 200 passing through the body 20, axial holes 160 passing through the block 16 and axial holes 130 passing through the injector holder 13.
  • the axial holes 130 open into the mixing chamber V14.
  • the compressed air then reaches the chamber V14 with a substantially axial direction, which is why we speak of a “straight” air flow.
  • the path of the "straight” air flow through the spray head 10 is shown by arrows F3 at the bottom. figure 2 .
  • the additional air circuit comprises a duct 202 running through the body 20, then between the ring 22 and the ring 24 then around the injector holder 13.
  • the external coaxial part of the injector holder 13 defines through holes 134 which open out. inside the mixing chamber V14.
  • One of these holes 134 is shown in dotted lines on the figure 2 to facilitate its location.
  • the holes 134 extend in a plane perpendicular to the spray axis X-X ', in a direction substantially orthoradial with respect to the spray axis X-X', that is to say in a tangential direction. with respect to a circle centered on the X-X 'axis.
  • the air circulating in the additional air circuit forms a rotational air flow in the mixing chamber V14, which is why we speak of a “vortex” air flow.
  • the path of the "vortex” air flow through the spray head 10 is represented by the arrows F2 at the bottom. figure 2 .
  • the compressed air forming the outer air gap between the cap 14 and the injector 12 and resulting from the mixing of the “straight” air flow with the “vortex” air flow is directed in a helical direction around of the spray axis X-X ', that is to say vortex.
  • the straight air flow shears the paint jet externally, which allows atomization in the form of fine droplets.
  • the "vortex” air flow causes the jet of product to rotate around the spray axis X-X ', which has the effect of stabilizing the jet.
  • the jet is further confined in a conical volume.
  • the "vortex” air flow also determines the diameter of the impact of the gun, that is to say the width of the jet.
  • the diameter of the impact formed by the jet can be adjusted by modifying the flow rate and / or the pressure of the “vortex” air flow.
  • the rear body 20 defines a duct 204 for the passage of the coating product.
  • This duct 204 is extended by a duct delimited in the block 16, which opens into a chamber surrounding the needle 18.
  • the needle 18 is receding relative to the seat 26, that is to say that the needle 18 is in an open position where it does not oppose the passage of the product in the direction of the injector 12.
  • the coating product then circulates inside the injector 12, in particular between the coaxial parts 12a and 12b of the injector 12, and is ejected from the spray head 10 through the annular passage delimited between the parts 12a and 12b.
  • the path of the coating material through the spray head 10 is shown by the arrows F1 at the bottom. figure 3 .
  • the gun is an electrostatic application gun, that is to say it comprises means for electrostatically charging the coating material before it is sprayed.
  • the part to be coated is connected to ground, which generates electrostatic forces making it possible to guide the electrostatically charged droplets of product towards the part.
  • the means for electrostatically charging the droplets are partially shown on figure 3 .
  • These means include a high-voltage block 38 supplied by the cable 6, a first metal resistor 36 connected to the high-voltage block 38 and a second carbon resistor 28 arranged in series with the resistor 36.
  • the electrical connection between the resistors 28 and 36 is provided by an electrical contact 37.
  • Resistor 28 comprises a conductive rod 30 which is in contact with a metal washer 32, in the brass example, supporting a metal spring 34.
  • the spring 34 is a conductor. in the form of a spiral interposed axially between the washer 32 and the internal coaxial part 12a of the injector 12, that is to say that it extends in the passage of the coating product.
  • the metal washer 32 is housed in a recess of the block 12.
  • the spring 34 is extended, at the front, by a metal wire 340 which passes through the internal coaxial part 12a of the injector 12.
  • the high-voltage block 38 therefore makes it possible to put the spring 34 under tension.
  • the environment surrounding the spring 34 that is to say the air surrounding the spring 34, is then ionized: this is the Corona effect.
  • the metallic wire 340 makes it possible to accentuate precisely this Corona effect.
  • the ions generated by the Corona effect stick to the drops of paint circulating inside the injector 12, which has the effect of calibrating the size of the drops: each drop then has substantially the same size. As an example, there are approximately 6000 ions per drop of paint.
  • the gun 2 includes a system for absorbing electrical energy in the event of a spark.
  • This system comprises resistor 28, which is designed to absorb by the Joule effect almost all of the electrical energy generated in the event of a spark and the metallic resistor 36, which forms an additional safety barrier in the event that the carbon resistor 28 does not absorb all the electrical energy.
  • the pistol 2 of figures 1 to 3 is manufactured according to a process according to the invention.
  • This method includes a step of dimensioning the dimension d of axial projection of the injector 12 with respect to the cap 14.
  • the dimension da in fact influences the definition of the impact and the aesthetic appearance of the coating. More precisely, to obtain a well-defined impact and a good aesthetic appearance for the coating, the dimension d must be selected, for each external diameter D of the injector 12 over an interval I delimited between a minimum dimension dmin and a maximum dimension dmax determined experimentally as a function of this diameter.
  • the dimensions dmin and dmax for a diameter D of approximately 9 mm are pointed at the figure 4 .
  • the determination of these minimum and maximum dimensions for different injector diameters gives curves, which are represented on the graph of the figure 4 .
  • the diameter D of the injector 12 is scaled between approximately 4 mm and 19 mm. Beyond 19 mm, a hollow jet is obtained rather than a round jet.
  • the curve in dotted lines represents the minimum overshoot dimension dmin as a function of the diameter D of the injector 12 and the solid line represents the maximum overshoot dimension dmax as a function of the diameter D of the injector 12.
  • the curve of the maximum overshoot dimension dmax comprises a first section T1 of zero slope, for a diameter D of between 4 and 5 mm approximately, a second section T2 of negative slope, for a diameter D of between 5 and 8 mm approximately, a third section T3 of lower negative slope, in absolute value, than that of section T2, for a diameter D of between 8 mm and 14 mm approximately and a fourth section T4 of zero slope for a diameter D of between 14 mm and 19 mm approx.
  • the curve of the minimum overshoot dimension dmin comprises a first section T1 'of zero slope, for an injector diameter D between approximately 4 mm and 6 mm, a second section T2' of negative slope, for an injector diameter between 6 mm and 12 mm approximately and a third section T3 ′ of negative slope greater, in absolute value, than that of the second section T2 ′, for a diameter D of between 12 mm and 19 mm approximately.
  • the area is delimited between the sections T1, T2, T3, T4 and the sections T1 ', T2' and T3 'on the one hand, and between two vertical sections T5 and T6 on the other hand.
  • the sections T5 and T6 are sections of infinite slope, which correspond respectively to the maximum and minimum limit values for the diameter D of the injector 12. The ratio between the dimension d and the diameter D is selected in this area.
  • the d / D ratio is selected, for D between 4 and 19 mm, with a value corresponding to the hatched area at the figure 4 , which is defined between the sections mentioned above.
  • a gun manufactured using the process according to the invention makes it possible to obtain a good aesthetic appearance of the coating without using a lot of atomizing air.
  • the impact is well defined because there is little or no “overspray” phenomenon linked to the pressure of the air circulating in the circuit. This makes it possible to reduce by a quarter, or even by half, the quantity of compressed air used compared to a gun where the dimension d is poorly defined or poorly adjusted and where it is necessary to compensate for this poor adjustment by overconsumption of air. spray.
  • the impact since the impact is well defined, there is less soiling and therefore less cleaning. For example, cleaning twice or even four times less frequently is sufficient. This also results in savings ranging from 5% to 20% on the amount of coating product used.
  • the protrusion dimension d is determined as a function of the width of the jet to be obtained, that is to say of the desired impact diameter. More precisely, the dimension d is chosen the lower the wider the jet to be obtained, and vice versa.
  • FIG 5 is schematically shown a spray head 10 for a gun for applying a coating product more sophisticated than that of figures 1 to 3 .
  • elements similar to those of the gun illustrated in figures 1 to 3 retain their reference number, while other elements have other reference numbers.
  • the differences from the embodiment of the figures 1 to 3 are mentioned below.
  • the dimension d also has an influence on the diameter of the round impact applied to a part. More precisely, the diameter of the impact is as large as the dimension d is chosen to be low.
  • the pistol of the figure 5 differs from that shown in figures 1 to 3 in that the value of the dimension d of axial protrusion of the injector 12 relative to the cap 14 can be adjusted by the painter.
  • the adjustment of the dimension d can be carried out only between two values: a minimum dimension dmin and a maximum dimension dmax, as envisaged above.
  • a sleeve 19 comprising, on its outer surface, a square thread 190, is immobilized with respect to the body 20 by means of a clamping ring 22, which is permanently screwed around the body 20 and which is linked in translation with the ring 22 by cooperation between an outer flange of the sleeve 19 and an inner lip of the ring 22.
  • the cap 14 comprises grooves 141 complementary to the square thread 190 of the sleeve 19.
  • the cap 14 can therefore be more or less screwed around the immobile sleeve 19, depending on the desired dimension d. It is therefore possible to adjust the dimension d as a function of the diameter of the desired impact, and this without affecting the correct operation of the gun.
  • the square thread 190 of the sleeve 19 is dimensioned to move the cap 14, along the axis X-X ', between a retracted position and an advanced position.
  • the dimension of axial projection d of the injector 12 with respect to the cap 14 corresponds to the minimum admissible dimension dmin
  • the dimension d corresponds to the maximum admissible dimension dmax.
  • the painter unscrews the cap 14 to reduce the dimension d and to reduce the dimension of the impact, the painter screws the cap 14 to increase the dimension d of protrusion of the injector 12 relative to the cap 14.
  • the dimension of the impact can then be adjusted without the aid of an additional jet of air called a “vortex”.
  • the manufacturing process of the pistol figure 5 advantageously comprises a step consisting in adjusting the dimension d, as well as the minimum and maximum dimensions dmin and dmax.
  • the pistol of figures 7 and 8 differs from that of figures 5 and 6 in that the adjustment of the dimension d is carried out automatically, and no longer manually.
  • the spray head comprises means for automatic adjustment of the dimension d of protrusion of the injector 12 relative to the cap 14.
  • These means comprise a motor M mounted on the outer surface of the body 20, a pinion 50 driven by the motor M by means of a transmission shaft 52 and a toothed wheel 54, which is in mesh with the pinion 50 and which is integral in rotation with the cap 14.
  • the rotation of the motor M automatically causes the rotation of the cap 14 and the displacement of the cap 14 parallel to the axis X-X '.
  • the motor M is a pneumatic motor, but it can also be an electric motor, for example a step-by-step motor.
  • a ruler 56 inscribed on the outer surface of the cap 14 allows the painter to know the value of the dimension d of the protrusion of the injector 12 relative to the cap 14. This ruler extends peripherally around the spray axis X-X '.
  • the gun according to the fourth embodiment differs from that of the second and third embodiment in that the cap 14 is slidably mounted relative to the body 20 of the spray head 10. More precisely, the cap 14 can be moved in translation along the spraying axis XX 'and is stationary in rotation around this axis X-X'. In the example, balls 58 make it possible to roll the cap 14 around the body 20.
  • the gun comprises means for automatically moving the cap 14 in translation relative to the injector 12.
  • These means include a jack 60, which is fixed to the outer surface of the body 20.
  • This jack can be of the pneumatic or electric type and actuates a jack rod 62, which is fixed by one of its ends to the cap 14.
  • a ruler 56 is inscribed on the outer surface of the body 20. This ruler 56 indicates to the painter the value of the selected dimension d. This strip 56 forms external means for locating the dimension d with which the injector 12 protrudes from the cap 14.
  • the automatic pistol figures 7 to 10 is designed to equip an installation for the automatic application of a coating product on conveyed parts, such as vehicle bodies.
  • the diameter of the impact of the sprayer can then be adjusted digitally by an operator, for example by acting on a computer, depending on the template of the part to be coated.
  • the impact diameter of the sprayer can also be adjusted automatically, in which case the installation includes a workpiece gauge detector conveyors and an electronic control unit. Such an installation is for example described in FR1551330 .
  • the electronic control unit then adjusts the dimension d of each gun according to the size of the part and / or the position of the gun on its trajectory.
  • another system can be used to adjust the overshoot dimension d.
  • the system can make it possible to move the injector 12 relative to the cap 14.
  • the cap 14 is moved manually relative to the injector 12, that is to say that the gun does not include means for automatically moving the cap 14.
  • the painter then directly manipulates the cap 14 with his hands.
  • the gun comprises means for locking the cap 14 in translation when the painter has reached the desired dimension value d.
  • These means are for example formed by a non-return pawl system.
  • the interval I over which the dimension d is chosen is delimited between a minimum dimension dmin and a maximum dimension dmax determined numerically as a function of the diameter D of the injector 12.
  • the gun of the embodiment of figures 1 to 3 can be modified to be able to adjust the dimension d of protrusion of the injector 12 with respect to the cap 14, this manually as in the figures 5 and 6 or automatically as in figures 7 to 10 .

Landscapes

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

Claims (10)

  1. Verfahren zum Herstellen einer Pistole (2) für die Aufbringung eines Beschichtungsstoffes, wobei diese Pistole eine Düse (12) zum Zerstäuben eines runden Strahls gemäß einer Zerstäubungsachse (X-X') und eine Kappe (14), die koaxial um die Düse herum angeordnet ist, umfasst, wobei diese Kappe vorgesehen ist, eine Luftschicht um den Strahl zu bilden, wobei dieses Verfahren dadurch gekennzeichnet ist, dass es einen Schritt a) umfasst, der darin besteht, einen axialen Überstand (d) der Düse (12) in Bezug auf die Kappe (14) abhängig vom Außendurchmesser (D) der Düse zu dimensionieren.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass im Schritt a) der Überstand (d) in einem Intervall (I) ausgewählt wird, das zwischen einem minimalen Überstand (dmin) und einem maximalen Überstand (dmax) begrenzt ist, die experimentell abhängig vom Außendurchmesser (D) der Düse (12) bestimmt werden.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in Schritt a) der Überstand (d) abhängig von der Breite des zu erhaltenden Strahls bestimmt wird.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass im Schritt A) der Überstand (d) umso kleiner gewählt wird je größer der zu erhaltende Strahl wird.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass für jeden Außendurchmesser (D) der Überstand (d) zwischen einem minimalen Überstand (dmin) und einem maximalen Überstand (dmax), die abhängig vom Außendurchmesser (D) bestimmt werden, gewählt wird, wobei die Bestimmung dieses minimalen (dmin) und maximalen (dmax) Überstandes für unterschiedliche Durchmesser der Düse (D) in einer grafischen Darstellung Kurven ergibt, die eine Auswahlfläche für den Überstand (d) begrenzen, wobei die die Auswahlfläche begrenzenden Kurven umfassen:
    - einen ersten Abschnitt (T1) mit einer Steigung von Null,
    - einen zweiten Abschnitt (T2) mit einer negativen Steigung,
    - einen dritten Abschnitt (T3) mit einer negativen Steigung und hinsichtlich des Absolutwertes kleiner als die Steigung des zweiten Abschnittes,
    - einen vierten Abschnitt (T4) mit einer Steigung von Null,
    - einen fünften senkrechten Abschnitt (T5) entsprechend einem oberen Grenzwert für den Durchmesser (D) der Düse,
    - einen sechsten Abschnitt (T3') mit einer negativen Steigung,
    - einen siebenten Abschnitt (T2') mit einer negativen Steigung und hinsichtlich des Absolutwertes kleiner als die Steigung des sechsten Abschnittes,
    - einen achten Abschnitt (T1') mit einer Steigung von Null,
    - einen neunten senkrechten Abschnitt (T6) entsprechend einem unteren Grenzwert für den Außendurchmesser (D) der Düse, dass die Kurve des maximalen Überstandes (dmax) den ersten, zweiten, dritten und vierten Abschnitt (T1, T2, T3, T4) umfasst, während die Kurve des minimalen Überstandes (dmin) den sechsten, siebten und achten Abschnitt (T3', T2', T1') umfasst.
  6. Pistole (2) für die Aufbringung eines Beschichtungsstoffes, umfassend
    - eine Düse (12) zum Abstrahlen eines runden Strahls gemäß einer Zerstäubungsachse (X-X'),
    - eine Kappe (14), die koaxial um die Düse herum angeordnet ist und vorgesehen ist, eine Luftschicht um den Strahl zu bilden, dadurch gekennzeichnet, dass die Düse axial in Bezug auf die Kappe übersteht und dass der axiale Überstand (d) der Düse (12) in Bezug auf die Kappe (14) zwischen einem minimalen Überstand (dmin) und einem maximalen Überstand (dmax) eingestellt werden kann, die abhängig vom Außendurchmesser (D) der Düse (12) bestimmt sind, dass die Kappe axial in einer Längsrichtung in Bezug auf den Körper (20) der Pistole beweglich ist und
    dass die Pistole Mittel (58, 60, 62) zum automatischen Verstellen der Kappe (14) in Längsrichtung in Bezug auf die Düse (12) umfasst.
  7. Pistole nach Anspruch 6 dadurch gekennzeichnet, dass die Kappe (14) auf eine feststehende Hülse (19) der Pistole aufgeschraubt ist, wobei die Einstellung des Überstandes (d) durch Aufschrauben oder Abschrauben der Kappe (14) um die Zerstäubungsachse (X-X') herum ausgeführt wird.
  8. Pistole nach Anspruch 7, dadurch gekennzeichnet, dass die Pistole Mittel (M, 50, 52, 54) zum automatischen Aufschrauben und Abschrauben der Kappe (14) umfasst.
  9. Pistole nach Anspruch 8, dadurch gekennzeichnet, dass die Mittel einen Motor (M), ein Ritzel (50), das geeignet ist, von dem Motor in Drehung versetzt zu werden, und einen Zahnkranz (54), der mit dem Ritzel im Eingriff ist und mit der Kappe (14) drehfest verbunden ist, umfassen.
  10. Pistole nach einem beliebigen der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die Kappe (14) eine Kammer (V14) begrenzt, in die mindestens ein Kanal (130) für axial gerichtete Luft und mindestens ein Kanal (134) für Luft, die gemäß einer im Wesentlichen orthoradialen Richtung in Bezug auf die Zerstäubungsachse (X-X') gerichtet ist, münden.
EP16192308.1A 2015-10-06 2016-10-05 Verfahren zur herstellung einer pistole zum auftragen eines beschichtungsprodukts, und auftragpistole für ein beschichtungsprodukt Active EP3153239B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1559490A FR3041885B1 (fr) 2015-10-06 2015-10-06 Procede de fabrication d'un pistolet pour l'application d'un produit de revetement et pistolet d'application d'un produit de revetement

Publications (2)

Publication Number Publication Date
EP3153239A1 EP3153239A1 (de) 2017-04-12
EP3153239B1 true EP3153239B1 (de) 2020-11-04

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US (1) US20170095823A1 (de)
EP (1) EP3153239B1 (de)
JP (1) JP2017070945A (de)
KR (1) KR20170041157A (de)
CN (1) CN106560253B (de)
ES (1) ES2835859T3 (de)
FR (1) FR3041885B1 (de)

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Publication number Priority date Publication date Assignee Title
US20190060938A1 (en) * 2017-08-24 2019-02-28 Electrostatic Spraying Systems, Inc. System and nozzle apparatus for electrostatic spraying
KR102600122B1 (ko) * 2019-07-18 2023-11-07 주식회사 엘지화학 지지체를 구비하는 용액 방사용 동축 노즐
US11911787B1 (en) 2019-08-16 2024-02-27 Gary Hammerlund Split manifold and method for multiple part fluid applications

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US1757573A (en) * 1921-03-07 1930-05-06 Matthews W N Corp Method of making spray guns
FR1551330A (de) 1967-12-26 1968-12-27
DK134595B (da) * 1974-08-12 1976-12-06 Bing & Grondahl Porcelainfab Fremgangsmåde ved glasering af porcelæn og sprøjtehoved til brug ved udøvelse af fremgangsmåden.
JPH038378Y2 (de) * 1984-11-16 1991-02-28
GB2283927B (en) * 1993-11-22 1998-01-21 Itw Ltd An improved spray nozzle
JP2003103203A (ja) * 2001-09-28 2003-04-08 Hosokawa Micron Corp 二流体スプレーノズル及び造粒装置並びに造粒システム
US20060097070A1 (en) * 2002-10-15 2006-05-11 Spraying Systems Co. External mix air assisted spray nozzle assembly
JP2006259053A (ja) * 2005-03-16 2006-09-28 Ricoh Co Ltd 電子写真装置の部品用スプレー塗布装置および電子写真感光体の製造方法
US9073077B2 (en) * 2009-10-20 2015-07-07 Freund Corporation Spray gun
WO2014132384A1 (ja) * 2013-02-28 2014-09-04 株式会社ケーエスケー ノズル装置
FR3009688B1 (fr) * 2013-08-13 2017-03-03 Sames Tech Pulverisateur d'un produit de revetement liquide et installation de pulverisation comprenant un tel pulverisateur
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CN106560253A (zh) 2017-04-12
US20170095823A1 (en) 2017-04-06
EP3153239A1 (de) 2017-04-12
KR20170041157A (ko) 2017-04-14
FR3041885A1 (fr) 2017-04-07
JP2017070945A (ja) 2017-04-13
CN106560253B (zh) 2021-02-12
ES2835859T3 (es) 2021-06-23
FR3041885B1 (fr) 2019-07-26

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