EP3153239A1 - Process for manufacturing a coating gun and coating gun - Google Patents

Process for manufacturing a coating gun and coating gun Download PDF

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Publication number
EP3153239A1
EP3153239A1 EP16192308.1A EP16192308A EP3153239A1 EP 3153239 A1 EP3153239 A1 EP 3153239A1 EP 16192308 A EP16192308 A EP 16192308A EP 3153239 A1 EP3153239 A1 EP 3153239A1
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EP
European Patent Office
Prior art keywords
injector
cap
dimension
gun
jet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16192308.1A
Other languages
German (de)
French (fr)
Other versions
EP3153239B1 (en
Inventor
Gilles GOISOT
Laurent Limbert
Philippe Provenaz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Exel Industries SA
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Exel Industries SA
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Publication of EP3153239A1 publication Critical patent/EP3153239A1/en
Application granted granted Critical
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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
    • 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
    • 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
    • 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
    • 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 for manufacturing a spray gun for the application of a coating product and to a coating application gun.
  • This gun In the field of spraying a coating product, it is known to use a gun for the application of the product.
  • This gun may be of the manual or automatic type and includes an injector for spraying a jet of product along a spraying 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 disk 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" nozzle 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 compressed air circuit called spraying, for expelling air in an axial direction around the jet of product. This so-called spray air is then shear the jet of product, which allows to atomize the coating product in the form of droplets, whose size is not homogeneous within the jet.
  • the jet is very unstable, that is why the gun sometimes includes a second compressed air circuit, called additional air circuit or "vortex" air circuit, for expelling compressed air around the jet of product in a direction substantially orthoradial with respect to the spray axis.
  • additional air circuit or "vortex" air circuit
  • the air is expelled around the product jet in a swirling manner, 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 thus to the diameter of the impact at a given application distance.
  • the angle of the cone can be adjusted by changing 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 the geometry of the latter. For example, the painter needs a larger impact for a large part, such as a truck cab, than for a rear view mirror.
  • the pressure of the spray air is chosen relatively high, especially when the product to be sprayed is viscous.
  • this causes an "overspray” phenomenon which results in a product projection outside the desired impact and therefore by a poorly defined impact geometry, which is why this technique is not usable for very viscous products, for example, whose viscosity is greater than 120 centipoise.
  • the additional air flow called "vortex" is even less effective than the spray air pressure is high. There is then an overconsumption of compressed air in the additional circuit.
  • the invention intends to remedy more particularly 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 resorting to compressed air. under high pressure in the spray air circuit.
  • the invention relates to a method of manufacturing a gun for the application of 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 provided to form a blade of air around the jet.
  • this method comprises a step a) of dimensioning a dimension of axial overflow of the injector relative to the cap as a function of the diameter of the injector.
  • the impact is well defined because there is no or little "overspray” phenomenon resulting from the use of compressed air under high pressure in the spray air circuit. This makes it possible to consume less compressed air in the spray 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 perform.
  • the additional airflow retains its effectiveness for adjusting the diameter of the impact and the stabilization of the product jet.
  • the invention also relates to a coating application gun, comprising an injector for projecting a round jet along a spraying axis, and a cap arranged coaxially around the injector, designed to form an air knife. around the jet.
  • the injector protrudes axially with respect to the cap, whereas the axial overflow dimension of the injector relative to the cap can be adjusted between a minimum value and a maximum value determined according to the diameter of the cap. injector.
  • the value of the axial overshoot dimension of the injector relative to the cap also influences the impact diameter 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 the consumption of compressed air.
  • the compressed air circulating in the additional air circuit then has a minimum flow rate to stabilize the jet of product.
  • the coating product is paint, in the form of powder or liquid.
  • the coating product may be a varnish, a solvent, an ink, or a lubricant such as oil.
  • the gun 2 comprises a product feed pipe 4, a compressed air supply pipe 8 and an electric cable 6 for charging the product electrostatically.
  • the gun 2 also comprises a spray head 10, which is better represented on the sections of the figures 2 and 3 .
  • the spray head 10 comprises an injector 12 for spraying a jet of product along an X-X 'spraying axis.
  • the injector 12 is formed by two coaxial parts 12a and 12b which delimit between them an annular product ejection passage.
  • the injector 12 is shaped to obtain a circular shape impact.
  • the shape of the impact can be a disc or a ring depending on the jet pressure.
  • the injector 12 is a "round jet" injector. D denotes the outside diameter of the injector 12.
  • a forward direction designates an axial direction, that is to say parallel to the X-X 'axis, oriented in the direction of the spraying
  • a rear direction designates an axial direction. oriented in the opposite direction to the spray.
  • the front designates a horizontal direction turned to the 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 called spraying and an additional compressed air circuit or "vortex". These two circuits run 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 thus allows the mixing of the air circulating in the air and the air circulating in the additional air circuit.
  • This chamber V14 is delimited between the internal coaxial portion of the injector door 13 and a cap 14 arranged coaxially around the injector 12.
  • the front end of the injector 12 protrudes axially relative to the front end surface of the cap 14 over a distance d, called the axial overflow dimension 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 spraying axis XX 'and in the direction of spraying, with a convergence angle 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 with respect 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 connected in translation with the block 16 by axial cooperation between an annular end flange belonging to the ring 24 and an outer 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 to selectively cut off the supply of the injector 12 in coating product.
  • the 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 in 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 connected in translation with the cap 14 by cooperation between an inner radial lip of the ring 22 and an outer radial flange of the cap 14. More specifically, 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 in a tight position, the dimension d of axial overflow 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 have an axial play that is harmful to the operation of the gun 2.
  • the spray air circuit comprises a duct 200 running 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 enters the chamber V14 with a substantially axial direction, which is why we speak of a "right” air flow.
  • the path of the "right” air flow through the spray head 10 is represented by the arrows F3 at the figure 2 .
  • the additional air circuit comprises a duct 202 running through the body 20, then between the ring 22 and the ring 24 and then around the injector holder 13.
  • the external coaxial portion 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 at the figure 2 to facilitate its identification.
  • the holes 134 extend in a plane perpendicular to the X-X 'sputtering axis, in a direction substantially orthoradial with respect to the X-X' sputtering axis, 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 figure 2 .
  • the compressed air forming the outer air gap between the cap 14 and the injector 12 and resulting from mixing the "right" air flow with the "vortex” air flow is directed in a helical direction around the X-X 'sputtering axis, that is swirling axis.
  • the straight airflow shears the spray paint externally, allowing atomization in the form of fine droplets.
  • the "vortex” air flow causes the jet of product to rotate around the X-X 'spraying axis, which has the effect of stabilizing the jet.
  • the jet is further confined in a conical volume.
  • the airflow "vortex" 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 changing the flow rate and / or the pressure of the "vortex" air flow.
  • the rear body 20 defines a conduit 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 set back 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 towards the injector 12.
  • the coating product then circulates inside the injector 12, in particular between the coaxial portions 12a and 12b of the injector 12, and is ejected from the spray head 10 through the annular passage defined between the parts 12a and 12b.
  • the path of the coating product through the spray head 10 is represented by the arrows F1 at the figure 3 .
  • the gun is an electrostatic spray gun, i.e. it includes means for electrostatically charging the coating product before it is sprayed.
  • the part to be coated is connected to ground, which generates electrostatic forces to guide the droplets of electrostatically charged product to the room.
  • the means for charging the droplets electrostatically are partially represented in the figure 3 . These means include a high-voltage block 38 fed 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.
  • the resistor 28 comprises a conductive rod 30 which is in contact with a metal washer 32, in the brass example,
  • the spring 34 is a spiral-shaped conductor interposed axially between the washer 32 and the inner coaxial portion 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 wire 340 which passes through the internal coaxial portion 12a of the injector 12.
  • the high-voltage block 38 thus makes it possible to put the spring 34 under tension.
  • the surrounding environment of the spring 34 that is to say the air surrounding the spring 34, is then ionized: this is the Corona effect.
  • the wire 340 makes it possible to accentuate precisely this corona effect.
  • the ions generated by the Corona effect are sticking to the drops of paint flowing inside the injector 12, which has the effect of calibrating the size of the drops: each drop then has substantially the same size. For example, there are about 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 the resistor 28, which is designed to absorb by the Joule effect almost all the electrical energy generated in the event of a spark and the metal resistor 36, which forms an additional safety barrier in the case where the resistance carbon 28 would not absorb all 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 overflow of the injector 12 with respect to the cap 14.
  • the rating has indeed an influence on the definition of the impact and the aesthetic appearance of the coating. More specifically, to obtain a well-defined impact and a good aesthetic appearance for the coating, the dimension d must be selected, for each outer 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 about 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 staggered between about 4 mm and 19 mm. Above 19 mm, a hollow jet is obtained rather than a round jet.
  • the dashed curve represents the minimum overshoot dimension dmin as a function of the diameter D of the injector 12 and the solid line curve represents the maximum overshoot dimension dmax as a function of the diameter D of the injector 12.
  • the curve of the maximum overshoot dmax comprises a first section T1 of zero slope, for a diameter D between 4 and 5 mm, a second section T2 of negative slope, for a diameter D between 5 and 8 mm, a third section T3 with a lower negative slope, in absolute value, than that of the section T2, for a diameter D of between approximately 8 mm and 14 mm and a fourth section T4 of zero slope for a diameter D between 14 mm and 19 mm; mm approx.
  • the curve of the minimum overshoot dimension dmin comprises a first section T1 'of zero slope, for an injector diameter D of between approximately 4 mm and 6 mm, a second section T2' of negative slope, for an injector diameter approximately between 6 mm and 12 mm and a third section T3 'with a higher negative slope, in absolute value, than that of the second section T2', for a diameter D between approximately 12 mm and 19 mm.
  • the area is delimited between the sections T1, T2, T3 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 respectively correspond 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 ratio d / D is selected, for D between 4 and 19 mm, with a value corresponding to the hatched surface at the figure 4 , which is defined between the sections mentioned above.
  • a gun made by the process according to the invention makes it possible to obtain a good aesthetic appearance of the coating without using a lot of spray air.
  • the impact is well defined because there is no or little "overspray" phenomenon related to the pressure of the air circulating in the circuit. This makes it possible to reduce by a quarter or even half the amount of compressed air used compared to a gun where the dimension d is poorly defined or incorrectly adjusted and where it is necessary to compensate for this bad adjustment by overconsumption of air from spray.
  • there is less soiling and therefore less cleaning For example, a cleaning twice, or four times less frequent is sufficient. It also results a savings ranging from 5% to 20% on the amount of coating product used.
  • a low "vortex" air flow makes it possible to stabilize the jet and to adjust the dimension of the impact because the efficiency of the "vortex" airflow is not impaired by a strong air pressure. spray.
  • the excess dimension d is determined according to the width of the jet to be obtained, that is to say the desired impact diameter. More precisely, the dimension d is chosen all the more low as the jet to be obtained is wide, and vice versa.
  • FIG 5 is schematically represented a spray head 10 for a gun application of a coating product more advanced than that of Figures 1 to 3 .
  • the elements similar to those of the gun illustrated in the Figures 1 to 3 retain their numerical reference, while the other elements carry other numerical references.
  • the differences with respect to the embodiment of the Figures 1 to 3 are mentioned below.
  • the dimension d also influences the diameter of the round impact applied to a part. Specifically, the diameter of the impact is as wide as the dimension d is chosen low.
  • the gun of the figure 5 differs from that shown in Figures 1 to 3 in that the value of the axial overflow dimension d 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 having, on its outer surface, a square thread 190 is immobilized relative to the body 20 by means of a clamping ring 22, which is screwed permanently around the body 20 and which is connected in translation with the ring 22 by cooperation between an outer collar 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 be more or less screwed around the stationary sleeve 19, depending on the desired dimension d. It is therefore possible to adjust the dimension d depending on the diameter of the desired impact, and this without affecting the proper operation of the gun.
  • the square thread 190 of the sleeve 19 is sized to move the cap 14, along the axis X-X ', between a retracted position and an advanced position.
  • the axial overflow dimension d of the injector 12 relative to the cap 14 corresponds to the minimum allowable dimension dmin
  • the dimension d corresponds to the maximum admissible dimension dmax.
  • the painter is not likely to operate the pistol in degraded mode by selecting a rating lower than the minimum allowable rating, dmin, or higher than the maximum allowable rating, 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 overflow of the injector 12 relative to the hat 14.
  • the dimension of the impact can then be adjusted without the aid of an additional air jet called "vortex".
  • the manufacturing process of the gun of the figure 5 advantageously comprises a step of adjusting the dimension d, as well as the minimum and maximum dimensions dmin and dmax.
  • the pistol Figures 7 and 8 differs from that of figures 5 and 6 in that the adjustment of the dimension d is performed automatically, and no longer manually.
  • the spray head comprises means for automatically adjusting the dimension d of overflow 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 gear 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 stepper motor.
  • a strip 56 inscribed on the outer surface of the cap 14 allows the painter to know the value of the dimension d of overflow of the injector 12 relative to the cap 14. This strip extends peripherally around the X-X 'spraying axis.
  • the gun according to the fourth embodiment differs from that of the second and third embodiments in that the cap 14 is slidably mounted relative to the body 20 of the spray head 10. More specifically, the cap 14 can be moved in translation along the axis of spray XX 'and is stationary in rotation about 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 on the outer surface of the body 20.
  • This jack can be of the pneumatic or electric type and operates a cylinder rod 62, which is fixed at one end to the cap 14.
  • a strip 56 is inscribed on the outer surface of the body 20. This strip 56 indicates to the painter the value of the dimension d selected. This strip 56 forms external means for marking the dimension d with which the injector 12 protrudes with respect to the cap 14.
  • the automatic pistol Figures 7 to 10 is designed to equip an installation of 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 diameter of the impact of the sprayer can also be adjusted automatically, in which case the installation comprises a conveyor part gauge detector and an electronic control unit.
  • the installation comprises a conveyor part gauge detector and an electronic control unit.
  • the electronic control unit then adjusts the dimension d of each gun according to the jig of the part and / or the position of the gun on its trajectory.
  • another system can be used to set the overshoot rating 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 hat 14 with his hands.
  • the gun comprises means for locking the cap 14 in translation when the painter has reached the value of dimension d desired.
  • These means are for example formed by a non-return ratchet system.
  • the interval I on 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 pistol of the embodiment of Figures 1 to 3 may be modified to be able to adjust the dimension d of overflow of the injector 12 relative to the cap 14, this manually as to the figures 5 and 6 or automatically Figures 7 to 10 .

Abstract

Ce procédé sert pour la fabrication d'un pistolet pour l'application d'un produit de revêtement, ce pistolet comprenant un injecteur (12) pour pulvériser un jet rond selon un axe de pulvérisation (X-X') et un chapeau (14) agencé coaxialement autour de l'injecteur, ce chapeau étant prévu pour former une lame d'air autour du jet. Ce procédé comprend une étape consistant à dimensionner une cote (d) de dépassement axial de l'injecteur (12) par rapport au chapeau (14) en fonction du diamètre (D) de l'injecteur.This method is used for the manufacture of a gun for the application of a coating product, the gun comprising an injector (12) for spraying a round jet along a spraying axis (X-X ') and a cap (14). ) arranged coaxially around the injector, this cap being provided to form a blade of air around the jet. This method comprises a step of dimensioning a dimension (d) of axial overshoot of the injector (12) relative to the cap (14) as a function of the diameter (D) of the injector.

Le pistolet d'application d'un produit de revêtement, comprend un injecteur (12) pour projeter un jet rond selon un axe de pulvérisation (X-X'), un chapeau (14) agencé coaxialement autour de l'injecteur, prévu pour former une lame d'air autour du jet. L'injecteur (12) dépasse axialement par rapport au chapeau (14) et la cote (d) de dépassement axial de l'injecteur par rapport au chapeau peut être réglée entre une valeur minimale et une valeur maximale déterminées en fonction du diamètre (D) de l'injecteur (12).

Figure imgaf001
The application gun of a coating product, comprises an injector (12) for projecting a round jet according to a spraying axis (X-X '), a cap (14) arranged coaxially around the injector, provided for form a blade of air around the jet. The injector (12) protrudes axially with respect to the cap (14) and the axial overflow dimension (d) of the injector relative to the cap can be adjusted between a minimum value and a maximum value determined according to the diameter (D). ) of the injector (12).
Figure imgaf001

Description

L'invention concerne un procédé de fabrication d'un pistolet pour l'application d'un produit de revêtement, ainsi qu'un pistolet d'application d'un produit de revêtement.The invention relates to a method for manufacturing a spray gun for the application of a coating product and to a coating application gun.

Dans le domaine de la pulvérisation d'un produit de revêtement, il est connu d'utiliser un pistolet pour l'application du produit. Ce pistolet peut être du type manuel ou automatique et comprend un injecteur pour pulvériser un jet de produit selon un axe de pulvérisation. Ce jet peut être plat ou rond selon le type d'injecteur utilisé. On parle alors d'un injecteur « jet rond » ou « jet plat ». Un jet plat donne un impact sous la forme d'une ellipse très étirée, alors qu'un jet rond donne un impact sous la forme d'un anneau ou d'un disque en fonction de la pression du jet. L'invention s'applique plus particulièrement aux pistolets équipés d'un injecteur « jet rond » tel que décrit dans FR-A-3 009 688 .In the field of spraying a coating product, it is known to use a gun for the application of the product. This gun may be of the manual or automatic type and includes an injector for spraying a jet of product along a spraying 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 disk 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 .

De manière connue, un pistolet à injecteur « jet rond » comprend un chapeau agencé coaxialement autour de l'injecteur et un passage annulaire d'éjection de produit qui est centré sur l'axe de pulvérisation et qui est délimité entre le chapeau et l'injecteur. Afin d'obtenir une pulvérisation fine sous forme de gouttelettes, le pistolet comprend un circuit d'air comprimé dit de pulvérisation, permettant d'expulser de l'air selon une direction axiale autour du jet de produit. Cet air dit de pulvérisation vient alors cisailler le jet de produit, ce qui permet d'atomiser le produit de revêtement sous forme de gouttelettes, dont la taille n'est pas homogène au sein du jet. A ce stade, le jet est très instable, c'est pourquoi le pistolet comprend parfois un second circuit d'air comprimé, appelé circuit d'air additionnel ou circuit d'air « vortex », permettant d'expulser de l'air comprimé autour du jet de produit selon une direction sensiblement orthoradiale par rapport à l'axe de pulvérisation. De cette manière, l'air est expulsé autour du jet de produit de manière tourbillonnaire, ce qui a pour effet de stabiliser le jet de produit. En outre, les gouttelettes du produit de revêtement sont confinées dans un volume conique.In known manner, a "round jet" nozzle 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. In order to obtain a fine spray in the form of droplets, the gun comprises a compressed air circuit called spraying, for expelling air in an axial direction around the jet of product. This so-called spray air is then shear the jet of product, which allows to atomize the coating product in the form of droplets, whose size is not homogeneous within the jet. At this stage, the jet is very unstable, that is why the gun sometimes includes a second compressed air circuit, called additional air circuit or "vortex" air circuit, for expelling compressed air 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 product jet in a swirling manner, which has the effect of stabilizing the jet of product. In addition, the droplets of the coating product are confined in a conical volume.

L'angle du cône dans lequel est confiné le jet de produit est proportionnel à la largeur du jet de produit et donc au diamètre de l'impact à une distance d'application donnée. L'angle du cône peut être ajusté en modifiant le débit et/ou la pression de l'air circulant dans le circuit d'air « vortex ». Le peintre peut alors régler la dimension de l'impact sur la pièce à revêtir en fonction de la géométrie de celle-ci. Par exemple, le peintre a besoin d'un impact plus large pour une pièce de grande envergure, comme une cabine de camion, que pour un rétroviseur.The angle of the cone in which the product jet is confined is proportional to the width of the product jet and thus to the diameter of the impact at a given application distance. The angle of the cone can be adjusted by changing 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 the geometry of the latter. For example, the painter needs a larger impact for a large part, such as a truck cab, than for a rear view mirror.

Pour obtenir une pulvérisation fine et un bon aspect esthétique du revêtement, la pression de l'air de pulvérisation est choisie relativement élevée, d'autant plus lorsque le produit à pulvériser est visqueux. Cependant, cela provoque un phénomène « d'overspray » qui se traduit par une projection de produit en dehors de l'impact désiré et donc par une géométrie d'impact mal définie, c'est pourquoi cette technique n'est pas utilisable pour des produits très visqueux, par exemple dont la viscosité est supérieure à 120 centipoises. En outre, le flux d'air additionnel dit « vortex » est d'autant moins efficace que la pression d'air de pulvérisation est élevée. Il y a alors une surconsommation d'air comprimé dans le circuit additionnel.To obtain a fine spray and a good appearance of the coating, the pressure of the spray air is chosen relatively high, especially when the product to be sprayed is viscous. However, this causes an "overspray" phenomenon which results in a product projection outside the desired impact and therefore by a poorly defined impact geometry, which is why this technique is not usable for very viscous products, for example, whose viscosity is greater than 120 centipoise. In addition, the additional air flow called "vortex" is even less effective than the spray air pressure is high. There is then an overconsumption of compressed air in the additional circuit.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un procédé permettant de fabriquer un pistolet capable de projeter un produit de revêtement avec un impact bien défini et bon aspect esthétique, sans avoir recours à de l'air comprimé sous haute pression dans le circuit d'air de pulvérisation.It is these drawbacks that the invention intends to remedy more particularly 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 resorting to compressed air. under high pressure in the spray air circuit.

A cet effet l'invention concerne un procédé de fabrication d'un pistolet pour l'application d'un produit de revêtement, ce pistolet comprenant un injecteur pour pulvériser un jet rond selon un axe de pulvérisation et un chapeau agencé coaxialement autour de l'injecteur, ce chapeau étant prévu pour former une lame d'air autour du jet. Conformément à l'invention, ce procédé comprend une étape a) consistant à dimensionner une cote de dépassement axial de l'injecteur par rapport au chapeau en fonction du diamètre de l'injecteur.For this purpose the invention relates to a method of manufacturing a gun for the application of 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 provided to form a blade of air around the jet. According to the invention, this method comprises a step a) of dimensioning a dimension of axial overflow of the injector relative to the cap as a function of the diameter of the injector.

Il a été prouvé expérimentalement que la valeur de la cote de dépassement axial de l'injecteur par rapport au chapeau a une influence sur la définition de l'impact, pour un diamètre d'injecteur donné. Ainsi, un pistolet mal calibré, c'est-à-dire pour lequel la cote de dépassement axial de l'injecteur par rapport au chapeau est mal dimensionnée, ne permet pas d'appliquer un revêtement ayant un bon aspect esthétique. Pour compenser ce défaut, on a tendance à utiliser de l'air comprimé sous haute pression dans le circuit d'air de pulvérisation, ce qui provoque le phénomène « d'overspray » mentionné ci-dessus. En revanche, le pistolet fabriqué selon le procédé conformément à l'invention permet d'obtenir un impact bien défini sans utiliser beaucoup d'air de pulvérisation. L'impact est bien défini car il n'y a pas ou peu de phénomène « d'overspray » découlant d'une utilisation d'air comprimé sous haute pression dans le circuit d'air de pulvérisation. Cela permet donc de consommer moins d'air comprimé dans le circuit d'air de pulvérisation et il devient possible de pulvériser des produits particulièrement visqueux, par exemple des produits dont la viscosité atteint 160 centipoises. En outre, comme l'impact est bien défini, il y a moins de salissures et donc moins de nettoyage à effectuer. Par ailleurs, le flux d'air additionnel conserve son efficacité pour le réglage du diamètre de l'impact et la stabilisation du jet de produit.It has been experimentally proven that the value of the axial overflow dimension of the injector relative to the cap has an influence on the definition of the impact, for a given injector diameter. Thus, a poorly calibrated gun, that is to say for which the axial overstepping dimension of the injector relative to the cap is poorly sized, does not allow to apply a coating having a good aesthetic appearance. To compensate for this defect, there is a tendency to use compressed air under high pressure in the spray air circuit, which causes the "overspray" phenomenon mentioned above. On the other hand, the gun manufactured according to the method according to the invention makes it possible to obtain a well-defined impact without using a lot of spray air. The impact is well defined because there is no or little "overspray" phenomenon resulting from the use of compressed air under high pressure in the spray air circuit. This makes it possible to consume less compressed air in the spray air circuit and it becomes possible to spray particularly viscous products, for example products whose viscosity reaches 160 centipoise. In addition, as the impact is well defined, there is less soiling and therefore less cleaning to perform. In addition, the additional airflow retains its effectiveness for adjusting the diameter of the impact and the stabilization of the product jet.

Selon des aspects avantageux mais non obligatoires, le procédé inclut au moins l'une des caractéristiques suivantes, lesquelles peuvent être prises dans toute combinaison techniquement admissible :

  • A l'étape a), la cote de dépassement est sélectionnée sur un intervalle délimité entre une cote minimale et une cote maximale déterminées expérimentalement en fonction du diamètre de l'injecteur ;
  • A l'étape a), la cote de dépassement est déterminée en fonction de la largeur du jet à obtenir ;
  • A l'étape a), la cote de dépassement est choisie d'autant plus faible que le jet à obtenir est large ;
  • Le rapport entre la cote de dépassement et le diamètre de l'injecteur est sélectionné dans une surface définie entre un premier tronçon de pente nulle, un deuxième tronçon de pente négative, un troisième tronçon de pente négative et inférieure, en valeur absolue, à la pente du deuxième tronçon, un quatrième tronçon de pente nulle, un cinquième tronçon vertical, correspondant à une valeur limite supérieure pour le diamètre de l'injecteur, un sixième tronçon de pente négative, un septième tronçon de pente négative, et inférieure, en valeur absolue, à la pente du sixième tronçon, un huitième tronçon de pente nulle et un neuvième tronçon vertical, correspondant à une valeur limite inférieure pour le diamètre de l'injecteur.
According to advantageous but not mandatory aspects, the method includes at least one of the following features, which can be taken in any technically permissible combination:
  • In step a), the overshoot dimension is selected over an interval delimited between a minimum dimension and a maximum dimension determined experimentally as a function of the diameter of the injector;
  • In step a), the overshoot dimension is determined according to the width of the jet to be obtained;
  • In step a), the overshoot rating is chosen lower as the jet to be obtained is wide;
  • The ratio between the overshoot dimension and the diameter of the injector is selected in a defined area between a first segment of zero slope, a second section of negative slope, a third section of negative slope and lower, in absolute value, at the slope of the second section, a fourth segment of zero slope, a fifth vertical section, corresponding to an upper limit value for the diameter of the injector, a sixth section of negative slope, a seventh segment of negative slope, and lower, in value absolute, at the slope of the sixth section, an eighth section of zero slope and a ninth vertical section, corresponding to a lower limit value for the diameter of the injector.

L'invention concerne également un pistolet d'application d'un produit de revêtement, comprenant un injecteur pour projeter un jet rond selon un axe de pulvérisation, et un chapeau agencé coaxialement autour de l'injecteur, prévu pour former une lame d'air autour du jet. Conformément à l'invention, l'injecteur dépasse axialement par rapport au chapeau, alors que la cote de dépassement axial de l'injecteur par rapport au chapeau peut être réglée entre une valeur minimale et une valeur maximale déterminées en fonction du diamètre de l'injecteur.The invention also relates to a coating application gun, comprising an injector for projecting a round jet along a spraying axis, and a cap arranged coaxially around the injector, designed to form an air knife. around the jet. According to the invention, the injector protrudes axially with respect to the cap, whereas the axial overflow dimension of the injector relative to the cap can be adjusted between a minimum value and a maximum value determined according to the diameter of the cap. injector.

La valeur de la cote de dépassement axial de l'injecteur par rapport au chapeau a également une influence sur le diamètre de l'impact pour un injecteur « jet rond ». Grâce au nouveau pistolet, il est donc possible d'ajuster le diamètre de l'impact du jet pulvérisé par le pistolet sans modifier le débit et/ou la pression de l'air circulant dans le circuit d'air additionnel, ce qui permet de limiter la consommation en air comprimé. L'air comprimé circulant dans le circuit d'air additionnel a alors un débit minimal pour stabiliser le jet de produit.The value of the axial overshoot dimension of the injector relative to the cap also influences the impact diameter 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 the consumption of compressed air. The compressed air circulating in the additional air circuit then has a minimum flow rate to stabilize the jet of product.

Selon des aspects avantageux mais non obligatoires, le pistolet inclut au moins l'une des caractéristiques suivantes, lesquelles peuvent être prises dans toute combinaison techniquement admissible :

  • Le chapeau est mobile axialement en translation par rapport à un corps du pistolet.
  • Le pistolet comprend des moyens pour déplacer automatiquement le chapeau en translation par rapport à l'injecteur.
  • Le chapeau est vissé sur une douille immobile du pistolet, le réglage de la cote étant effectuée par vissage ou dévissage du chapeau autour de l'axe de pulvérisation;
  • Le pistolet comprend des moyens pour visser et dévisser automatiquement le chapeau.- Les moyens comprennent un moteur, un pignon apte à être entrainé en rotation par le moteur et une roue dentée engrenée avec le pignon et solidaire en rotation avec le chapeau ;
  • Le chapeau délimite une chambre, dans laquelle débouchent au moins un passage d'air dirigé axialement et au moins un passage d'air dirigé selon une direction sensiblement orthoradiale par rapport à l'axe de pulvérisation ;
According to advantageous but not mandatory aspects, the gun includes at least one of the following features, which can be taken in any technically permissible combination:
  • The cap is movable axially in translation relative to a gun body.
  • The gun comprises means for automatically moving the cap in translation relative to the injector.
  • The cap is screwed onto a stationary socket of the gun, the adjustment of the dimension being performed by screwing or unscrewing the cap around the spray axis;
  • The gun comprises means for automatically screwing and unscrewing the cap. The means comprise a motor, a pinion adapted to be rotated by the motor, and a gear gear meshing with the pinion and integral in rotation with the cap;
  • The cap defines a chamber into which at least one air passage directed axially and at least one air passage directed in a direction substantially orthoradial with respect to the spray axis;

L'invention et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre de quatre modes de réalisation d'un pistolet fabriqué selon le procédé objet de l'invention et d'un pistolet conforme à son principe, cette description étant donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue de côté d'un pistolet d'application d'un produit de revêtement fabriqué selon une procédé conforme à l'invention,
  • la figure 2 est une coupe partielle selon la ligne II-II à la figure 1,
  • la figure 3 est une coupe partielle dans un plan perpendiculaire au plan de la figure 2,
  • la figure 4 est un graphique représentant une aire pour la sélection d'une cote de dépassement d'un injecteur par rapport à un chapeau du pistolet de la figure 1, en fonction du diamètre extérieur de l'injecteur, et
  • la figure 5 est un schéma en coupe d'une tête de pulvérisation appartenant à un pistolet conforme à un deuxième mode de réalisation de l'invention,
  • la figure 6 correspond à la tête de pulvérisation de la figure 5 vue de l'extérieur,
  • la figure 7 est un schéma en coupe d'une tête de pulvérisation appartenant à un pistolet conforme à un troisième mode de réalisation de l'invention,
  • la figure 8 correspond à la tête de pulvérisation de la figure 7 vue de l'extérieur,
  • la figure 9 est un schéma en coupe d'une tête de pulvérisation appartenant à un pistolet conforme à un quatrième mode de réalisation de l'invention, et
  • la figure 10 correspond à la tête de pulvérisation de la figure 9 vue de l'extérieur.
The invention and other advantages thereof will appear more clearly in the light of the following description of four embodiments of a gun manufactured according to the method of the invention and a gun conforming to its principle, this description being given solely by way of example and with reference to the appended drawings in which:
  • the figure 1 is a side view of an applicator gun of a coating product made according to a process according to the invention,
  • the figure 2 is a partial section along the line II-II to the figure 1 ,
  • the figure 3 is a partial section in a plane perpendicular to the plane of the figure 2 ,
  • the figure 4 is a graph representing an area for the selection of an overtaking dimension of an injector compared to a gun cap of the figure 1 , depending on the outside diameter of the injector, and
  • the figure 5 is a sectional diagram of a spray head belonging to a pistol according to a second embodiment of the invention,
  • the figure 6 corresponds to the spray head of the figure 5 from the outside,
  • the figure 7 is a sectional diagram of a spray head belonging to a pistol according to a third embodiment of the invention,
  • the figure 8 corresponds to the spray head of the figure 7 from the outside,
  • the figure 9 is a sectional diagram of a spray head belonging to a pistol according to a fourth embodiment of the invention, and
  • the figure 10 corresponds to the spray head of the figure 9 from the outside.

Sur les figures 1 à 3 est représenté un pistolet 2 d'application d'un produit de revêtement. Dans l'exemple, le produit de revêtement est de la peinture, sous forme de poudre ou liquide. En variante, il peut s'agir d'un vernis, d'un solvant, d'une encre, ou encore d'un lubrifiant comme de l'huile.On the Figures 1 to 3 is shown a gun 2 for applying a coating product. In the example, the coating product is paint, in the form of powder or liquid. Alternatively, it may be a varnish, a solvent, an ink, or a lubricant such as oil.

Le pistolet 2 comprend un tuyau 4 d'alimentation en produit, un tuyau 8 d'alimentation en air comprimé et un câble électrique 6 pour charger le produit électrostatiquement. Le pistolet 2 comprend également une tête de pulvérisation 10, qui est mieux représentée sur les coupes des figures 2 et 3.The gun 2 comprises a product feed pipe 4, a compressed air supply pipe 8 and an electric cable 6 for charging the product electrostatically. The gun 2 also comprises a spray head 10, which is better represented on the sections of the figures 2 and 3 .

Comme visible à la figure 2, la tête de pulvérisation 10 comprend un injecteur 12 pour pulvériser un jet de produit selon un axe de pulvérisation X-X'. L'injecteur 12 est formé par deux pièces coaxiales 12a et 12b qui délimitent entre elles un passage annulaire d'éjection de produit. Ainsi, l'injecteur 12 est conformé pour obtenir un impact de forme circulaire. La forme de l'impact peut être un disque ou un anneau en fonction de la pression du jet. L'injecteur 12 est donc un injecteur «jet rond ». D désigne le diamètre extérieur de l'injecteur 12.As visible at figure 2 the spray head 10 comprises an injector 12 for spraying a jet of product along an X-X 'spraying axis. The injector 12 is formed by two coaxial parts 12a and 12b which delimit between them an annular product ejection passage. Thus, the injector 12 is shaped to obtain a circular shape impact. The shape of the impact can be a disc or a ring depending on the jet pressure. The injector 12 is a "round jet" injector. D denotes the outside diameter of the injector 12.

Dans la suite de la description, une direction avant désigne une direction axiale, c'est-à-dire parallèle à l'axe X-X', orientée dans le sens de la pulvérisation, alors qu'une direction arrière désigne une direction axiale orientée dans le sens opposé à la pulvérisation. Par exemple, sur les figures 2 et 3, l'avant désigne une direction horizontale tournée vers la gauche.In the remainder of the description, a forward direction designates an axial direction, that is to say parallel to the X-X 'axis, oriented in the direction of the spraying, whereas a rear direction designates an axial direction. oriented in the opposite direction to the spray. For example, on figures 2 and 3 , the front designates a horizontal direction turned to the left.

L'injecteur 12 est monté sur un porte-injecteur 13 qui est disposé à l'arrière par rapport à l'injecteur 12. Le porte-injecteur 13 comprend deux parties coaxiales qui sont d'un seul tenant.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.

Le pistolet 2 comprend un circuit d'air comprimé dit de pulvérisation et un circuit d'air comprimé dit additionnel ou « vortex ». Ces deux circuits cheminent à travers un corps 20 disposé à l'arrière de la tête de pulvérisation 10 et débouchent dans une chambre V14 de formation d'une lame d'air autour du jet de produit. Cette chambre V14 permet donc le mélange de l'air circulant dans le circuit d'air de pulvérisation et de l'air circulant dans le circuit d'air additionnel. Cette chambre V14 est délimitée entre la partie coaxiale interne du porte injecteur 13 et un chapeau 14 agencé coaxialement autour de l'injecteur 12. L'extrémité avant de l'injecteur 12 dépasse axialement par rapport à la surface d'extrémité avant du chapeau 14 sur une distance d, appelée cote de dépassement axial de l'injecteur 12 par rapport au chapeau 14.The gun 2 comprises a compressed air circuit called spraying and an additional compressed air circuit or "vortex". These two circuits run 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 thus allows the mixing of the air circulating in the air and the air circulating in the additional air circuit. This chamber V14 is delimited between the internal coaxial portion of the injector door 13 and a cap 14 arranged coaxially around the injector 12. The front end of the injector 12 protrudes axially relative to the front end surface of the cap 14 over a distance d, called the axial overflow dimension of the injector 12 relative to the cap 14.

Le chapeau 14 comprend une surface intérieure S14 guidant l'air comprimé vers la sortie, c'est-à-dire autour de l'injecteur 12. Cette surface S14 est tronconique et converge, par rapport à l'axe de pulvérisation X-X' et dans le sens de la pulvérisation, avec un angle de convergence A14 compris entre 15° et 60°, notamment égal à 54°.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 spraying axis XX 'and in the direction of spraying, with a convergence angle A14 of between 15 ° and 60 °, in particular equal to 54 °.

Le porte-injecteur 13 est vissé sur un bloc 16 qui est immobilisé axialement par rapport au corps arrière 20 au moyen d'une bague extérieure de serrage 24. Cette bague 24 est vissée sur le corps arrière 20 et est liée en translation avec le bloc 16 par coopération axiale entre un rebord annulaire d'extrémité appartenant à la bague 24 et un épaulement radial externe du bloc 16.The injector holder 13 is screwed onto a block 16 which is immobilized axially with respect 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 connected in translation with the block 16 by axial cooperation between an annular end flange belonging to the ring 24 and an outer radial shoulder of the block 16.

Un pointeau 18 fabriqué dans un alliage métallique inoxydable est mobile axialement à l'intérieur du corps 20 et à l'intérieur du bloc 16 au contact d'un siège 26 logé dans le bloc 16 afin de couper sélectivement l'alimentation de l'injecteur 12 en produit de revêtement. Le pointeau 18 peut être aussi connu sous le nom d'aiguille. Dans la configuration de la figure 2, l'aiguille 18 est au contact du siège 26, coupant ainsi l'alimentation de l'injecteur 12 en produit de revêtement. Le pistolet 2 comprend un organe 40 de guidage de l'aiguille 18 en translation selon l'axe X-X'. Cet organe de guidage est un coussinet 40 qui est logé en partie à l'intérieur du bloc 16 et en partie à l'intérieur du corps 20.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 to selectively cut off the supply of the injector 12 in coating product. The 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 in 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.

Le chapeau 14 est immobilisé par rapport au corps 20 au moyen d'une bague extérieure de verrouillage 22. Cette bague 22 est vissée sur le corps 20 et est liée en translation avec le chapeau 14 par coopération entre une lèvre radiale interne de la bague 22 et un rebord radial extérieur du chapeau 14. Plus précisément, la bague 22 est vissée autour du corps 20 jusqu'à placer le chapeau 14 dans une position serrée, ou nominale, dans laquelle il ne bouge plus par rapport au corps 20. Dans la position serrée, la cote d de dépassement axial de l'injecteur 12 par rapport au chapeau 14 est fixe. Il n'est alors pas possible de régler la cote d, c'est-à-dire desserrer la bague 22, car le chapeau 14 présenterait alors un jeu axial nuisible au fonctionnement du pistolet 2.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 connected in translation with the cap 14 by cooperation between an inner radial lip of the ring 22 and an outer radial flange of the cap 14. More specifically, 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 in a tight position, the dimension d of axial overflow 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 have an axial play that is harmful to the operation of the gun 2.

Le circuit d'air de pulvérisation comprend un conduit 200 cheminant à travers le corps 20, des trous axiaux 160 traversant le bloc 16 et des trous axiaux 130 traversant le porte-injecteur 13. Les trous axiaux 130 débouchent dans la chambre de mélange V14. L'air comprimé parvient alors dans la chambre V14 avec une direction sensiblement axiale, c'est pourquoi on parle d'un flux air « droit ». Le trajet du flux d'air « droit » à travers la tête de pulvérisation 10 est représenté par les flèches F3 à la figure 2.The spray air circuit comprises a duct 200 running 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 enters the chamber V14 with a substantially axial direction, which is why we speak of a "right" air flow. The path of the "right" air flow through the spray head 10 is represented by the arrows F3 at the figure 2 .

Le circuit d'air additionnel comprend un conduit 202 cheminant à travers le corps 20, puis entre la bague 22 et la bague 24 puis autour du porte-injecteur 13. La partie coaxiale externe du porte-injecteur 13 délimite des trous traversants 134 qui débouchent à l'intérieur de la chambre de mélange V14. L'un de ces trous 134 est représenté en pointillés à la figure 2 pour faciliter son repérage. Les trous 134 s'étendent dans un plan perpendiculaire à l'axe de pulvérisation X-X', selon une direction sensiblement orthoradiale par rapport à l'axe de pulvérisation X-X', c'est-à-dire selon une direction tangentielle par rapport à un cercle centré sur l'axe X-X'. Ainsi, l'air circulant dans le circuit d'air additionnel forme un flux d'air rotationnel dans la chambre de mélange V14, c'est pourquoi on parle d'un flux d'air « vortex ». Le trajet du flux d'air « vortex » à travers la tête de pulvérisation 10 est représenté par les flèches F2 à la figure 2.The additional air circuit comprises a duct 202 running through the body 20, then between the ring 22 and the ring 24 and then around the injector holder 13. The external coaxial portion 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 at the figure 2 to facilitate its identification. The holes 134 extend in a plane perpendicular to the X-X 'sputtering axis, in a direction substantially orthoradial with respect to the X-X' sputtering axis, that is to say in a tangential direction with respect to a circle centered on the X-X 'axis. Thus, 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 figure 2 .

Ainsi, l'air comprimé formant la lame d'air extérieur entre le chapeau 14 et l'injecteur 12 et résultant du mélange du flux d'air « droit » avec le flux d'air « vortex » est dirigé suivant une direction hélicoïdale autour de l'axe de pulvérisation X-X', c'est-à-dire tourbillonnaire. Le flux d'air droit permet de cisailler le jet de peinture extérieurement, ce qui permet une atomisation sous forme de fines gouttelettes. Le flux d'air « vortex » entraine le jet de produit en rotation autour de l'axe de pulvérisation X-X', ce qui a pour effet de stabiliser le jet. Le jet est en outre confiné dans un volume conique. Le flux d'air « vortex » détermine également le diamètre de l'impact du pistolet, c'est-à-dire la largeur du jet. Ainsi, le diamètre de l'impact formé par le jet peut être ajusté en modifiant le débit et/ou la pression du flux d'air « vortex ».Thus, the compressed air forming the outer air gap between the cap 14 and the injector 12 and resulting from mixing the "right" air flow with the "vortex" air flow is directed in a helical direction around the X-X 'sputtering axis, that is swirling axis. The straight airflow shears the spray paint externally, allowing atomization in the form of fine droplets. The "vortex" air flow causes the jet of product to rotate around the X-X 'spraying axis, which has the effect of stabilizing the jet. The jet is further confined in a conical volume. The airflow "vortex" also determines the diameter of the impact of the gun, that is to say the width of the jet. Thus, the diameter of the impact formed by the jet can be adjusted by changing the flow rate and / or the pressure of the "vortex" air flow.

Comme visible à la figure 3, le corps arrière 20 délimite un conduit 204 pour le passage du produit de revêtement. Ce conduit 204 se prolonge par un conduit délimité dans le bloc 16, qui débouche dans une chambre entourant l'aiguille 18. Dans la configuration de la figure 3, l'aiguille 18 est en recul par rapport au siège 26, c'est-à-dire que l'aiguille 18 est dans une position ouverte où elle ne s'oppose pas au passage du produit en direction de l'injecteur 12. Le produit de revêtement circule alors à l'intérieur de l'injecteur 12, notamment entre les parties coaxiales 12a et 12b de l'injecteur 12, et est éjecté de la tête de pulvérisation 10 à travers le passage annulaire délimité entre les parties 12a et 12b. Le trajet du produit de revêtement à travers la tête de pulvérisation 10 est représenté par les flèches F1 à la figure 3.As visible at figure 3 , the rear body 20 defines a conduit 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. In the configuration of the figure 3 , the needle 18 is set back 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 towards the injector 12. The coating product then circulates inside the injector 12, in particular between the coaxial portions 12a and 12b of the injector 12, and is ejected from the spray head 10 through the annular passage defined between the parts 12a and 12b. The path of the coating product through the spray head 10 is represented by the arrows F1 at the figure 3 .

Le pistolet est un pistolet d'application électrostatique, c'est-à-dire qu'il comprend des moyens pour charger électrostatiquement le produit de revêtement avant qu'il soit pulvérisé. La pièce à revêtir est reliée à la masse, ce qui génère des forces électrostatiques permettant de guider les gouttelettes de produit chargées électrostatiquement vers la pièce. Les moyens pour charger les gouttelettes électrostatiquement sont partiellement représentés à la figure 3. Ces moyens incluent un bloc haute-tension 38 alimenté par le câble 6, une première résistance métallique 36 connectée au bloc haute-tension 38 et une deuxième résistance en carbone 28 agencée en série avec la résistance 36. La connexion électrique entre les résistances 28 et 36 est assurée par un contact électrique 37. La résistance 28 comporte une tige conductrice 30 qui est en contact avec une rondelle métallique 32, dans l'exemple en laiton, d'appui d'un ressort métallique 34. Le ressort 34 est un conducteur en forme de spirale interposé axialement entre la rondelle 32 et la partie coaxiale interne 12a de l'injecteur 12, c'est-à-dire qu'il s'étend dans le passage du produit de revêtement. La rondelle métallique 32 est logée dans un évidement du bloc 12. Le ressort 34 se prolonge, à l'avant, par un fil métallique 340 qui traverse la partie coaxiale interne 12a de l'injecteur 12.The gun is an electrostatic spray gun, i.e. it includes means for electrostatically charging the coating product before it is sprayed. The part to be coated is connected to ground, which generates electrostatic forces to guide the droplets of electrostatically charged product to the room. The means for charging the droplets electrostatically are partially represented in the figure 3 . These means include a high-voltage block 38 fed 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. The resistor 28 comprises a conductive rod 30 which is in contact with a metal washer 32, in the brass example, The spring 34 is a spiral-shaped conductor interposed axially between the washer 32 and the inner coaxial portion 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 wire 340 which passes through the internal coaxial portion 12a of the injector 12.

Le bloc haute-tension 38 permet donc de mettre le ressort 34 sous tension. Le milieu environnant du ressort 34, c'est-à-dire l'air entourant le ressort 34, est alors ionisé : c'est l'effet Corona. Le fil métallique 340 permet d'accentuer justement cet effet Corona. Les ions générés par effet Corona viennent se coller sur les gouttes de peinture circulant à l'intérieur de l'injecteur 12, ce qui a pour effet de calibrer la taille des gouttes : chaque goutte présente alors sensiblement la même taille. A titre d'exemple, il y a environ 6000 ions par goutte de peinture.The high-voltage block 38 thus makes it possible to put the spring 34 under tension. The surrounding environment of the spring 34, that is to say the air surrounding the spring 34, is then ionized: this is the Corona effect. The wire 340 makes it possible to accentuate precisely this corona effect. The ions generated by the Corona effect are sticking to the drops of paint flowing inside the injector 12, which has the effect of calibrating the size of the drops: each drop then has substantially the same size. For example, there are about 6000 ions per drop of paint.

Les ions en surplus, c'est-à-dire les ions qui ne se sont pas collés sur les gouttes de peinture, sont déchargés à travers l'aiguille 18 vers la terre. Il n'y a donc pas d'accumulation des charges électriques comme dans un condensateur, ce qui permet de limiter le risque d'électrocution et d'incendie.Surprising ions, i.e. ions that have not adhered to the paint drops, are discharged through the needle 18 to the earth. There is therefore no accumulation of electrical charges as in a capacitor, which limits the risk of electrocution and fire.

Toutefois, le pistolet 2 comprend un système pour absorber l'énergie électrique en cas d'étincelle. Ce système comprend la résistance 28, qui est prévue pour absorber par effet Joule la quasi-totalité de l'énergie électrique générée en cas d'étincelle et la résistance métallique 36, qui forme une barrière de sécurité supplémentaire dans le cas où la résistance en carbone 28 n'absorberait pas toute l'énergie électrique.However, the gun 2 includes a system for absorbing electrical energy in the event of a spark. This system comprises the resistor 28, which is designed to absorb by the Joule effect almost all the electrical energy generated in the event of a spark and the metal resistor 36, which forms an additional safety barrier in the case where the resistance carbon 28 would not absorb all electrical energy.

Le pistolet 2 des figures 1 à 3 est fabriqué suivant un procédé conforme à l'invention. Ce procédé inclut une étape de dimensionnement de la cote d de dépassement axial de l'injecteur 12 par rapport au chapeau 14.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 overflow of the injector 12 with respect to the cap 14.

La cote d a en effet une influence sur la définition de l'impact et sur l'aspect esthétique du revêtement. Plus précisément, pour obtenir un impact bien défini et un bon aspect esthétique pour le revêtement, la cote d doit être sélectionnée, pour chaque diamètre extérieur D de l'injecteur 12 sur un intervalle I délimité entre une cote minimale dmin et une cote maximale dmax déterminées expérimentalement en fonction de ce diamètre. A titre d'exemple, les cotes dmin et dmax pour un diamètre D d'environ 9 mm sont pointées à la figure 4. La détermination de ces cotes minimale et maximale pour différents diamètres d'injecteur donne des courbes, lesquelles sont représentées sur le graphique de la figure 4. Comme visible sur cette figure, le diamètre D de l'injecteur 12 est échelonné entre environ 4 mm et 19 mm. Au-delà de 19 mm, on obtient un jet creux plutôt qu'un jet rond.The rating has indeed an influence on the definition of the impact and the aesthetic appearance of the coating. More specifically, to obtain a well-defined impact and a good aesthetic appearance for the coating, the dimension d must be selected, for each outer 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. By way of example, the dimensions dmin and dmax for a diameter D of about 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 . As visible in this figure, the diameter D of the injector 12 is staggered between about 4 mm and 19 mm. Above 19 mm, a hollow jet is obtained rather than a round jet.

Sur la figure 4, la courbe en traits interrompus représente la cote de dépassement minimal dmin en fonction du diamètre D de l'injecteur 12 et la courbe en trait plein représente la cote de dépassement maximal dmax en fonction du diamètre D de l'injecteur 12. Ces deux courbes délimitent une aire pour sélectionner la cote d. Cette aire est hachurée sur la figure 4 pour une meilleure visualisation. Lorsque la cote d est choisie en dehors de cette aire, le revêtement appliqué présente un moins bon aspect esthétique. La courbe de la cote de dépassement maximal dmax comprend un premier tronçon T1 de pente nulle, pour un diamètre D compris entre 4 et 5 mm environ, un deuxième tronçon T2 de pente négative, pour un diamètre D compris entre 5 et 8 mm environ, un troisième tronçon T3 de pente négative plus faible, en valeur absolue, que celle du tronçon T2, pour un diamètre D compris entre 8 mm et 14 mm environ et un quatrième tronçon T4 de pente nulle pour un diamètre D compris entre 14 mm et 19 mm environ.On the figure 4 the dashed curve represents the minimum overshoot dimension dmin as a function of the diameter D of the injector 12 and the solid line curve represents the maximum overshoot dimension dmax as a function of the diameter D of the injector 12. These two curves delimit an area to select dimension d. This area is hatched on the figure 4 for better viewing. When the dimension d is chosen outside this area, the applied coating has a less good aesthetic appearance. The curve of the maximum overshoot dmax comprises a first section T1 of zero slope, for a diameter D between 4 and 5 mm, a second section T2 of negative slope, for a diameter D between 5 and 8 mm, a third section T3 with a lower negative slope, in absolute value, than that of the section T2, for a diameter D of between approximately 8 mm and 14 mm and a fourth section T4 of zero slope for a diameter D between 14 mm and 19 mm; mm approx.

La courbe de la cote de dépassement minimal dmin comprend un premier tronçon T1' de pente nulle, pour un diamètre d'injecteur D compris entre 4 mm et 6 mm environ, un deuxième tronçon T2' de pente négative, pour un diamètre d'injecteur compris entre 6 mm et 12 mm environ et un troisième tronçon T3' de pente négative plus élevée, en valeur absolue, que celle du deuxième tronçon T2', pour un diamètre D compris entre 12 mm et 19 mm environ. L'aire est délimitée entre les tronçons T1, T2, T3 et les tronçons T1', T2' et T3' d'une part, et entre deux tronçons verticaux T5 et T6 d'autre part. Les tronçons T5 et T6 sont des tronçons de pente infinie, qui correspondent respectivement aux valeurs limites maximale et minimale pour le diamètre D de l'injecteur 12. Le rapport entre la cote d et le diamètre D est sélectionné dans cette aire.The curve of the minimum overshoot dimension dmin comprises a first section T1 'of zero slope, for an injector diameter D of between approximately 4 mm and 6 mm, a second section T2' of negative slope, for an injector diameter approximately between 6 mm and 12 mm and a third section T3 'with a higher negative slope, in absolute value, than that of the second section T2', for a diameter D between approximately 12 mm and 19 mm. The area is delimited between the sections T1, T2, T3 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 respectively correspond 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.

En d'autres termes, le rapport d/D est sélectionné, pour D compris entre 4 et 19 mm, avec une valeur correspondant à la surface hachurée à la figure 4, qui est définie entre les tronçons mentionnés ci-dessus.In other words, the ratio d / D is selected, for D between 4 and 19 mm, with a value corresponding to the hatched surface at the figure 4 , which is defined between the sections mentioned above.

Ainsi, un pistolet fabriqué grâce au procédé conforme à l'invention permet d'obtenir un bon aspect esthétique du revêtement sans utiliser beaucoup d'air de pulvérisation. L'impact est bien défini car il n'y a pas ou peu de phénomène « d'overspray » lié à la pression de l'air circulant dans le circuit. Cela permet de réduire du quart, voire de moitié, la quantité d'air comprimé utilisée par rapport à un pistolet où la cote d est mal définie ou mal réglée et où il est nécessaire de compenser ce mauvais réglage par une surconsommation d'air de pulvérisation. En outre, comme l'impact est bien défini, il y a moins de salissures et donc moins de nettoyage. A titre d'exemple, un nettoyage deux fois, voire quatre fois moins fréquent est suffisant. Il en résulte également une économie allant de 5% à 20% sur la quantité de produit de revêtement utilisée. Enfin, un faible débit d'air « vortex » permet de stabiliser le jet et de régler la dimension de l'impact car l'efficacité du flux d'air « vortex » n'est pas altérée par une forte pression de l'air de pulvérisation. Par ailleurs, la cote de dépassement d est déterminée en fonction de la largeur du jet à obtenir, c'est-à-dire du diamètre d'impact désiré. Plus précisément, la cote d est choisie d'autant plus faible que le jet à obtenir est large, et inversement.Thus, a gun made by the process according to the invention makes it possible to obtain a good aesthetic appearance of the coating without using a lot of spray air. The impact is well defined because there is no or little "overspray" phenomenon related to the pressure of the air circulating in the circuit. This makes it possible to reduce by a quarter or even half the amount of compressed air used compared to a gun where the dimension d is poorly defined or incorrectly adjusted and where it is necessary to compensate for this bad adjustment by overconsumption of air from spray. In addition, as the impact is well defined, there is less soiling and therefore less cleaning. For example, a cleaning twice, or four times less frequent is sufficient. It also results a savings ranging from 5% to 20% on the amount of coating product used. Finally, a low "vortex" air flow makes it possible to stabilize the jet and to adjust the dimension of the impact because the efficiency of the "vortex" airflow is not impaired by a strong air pressure. spray. Furthermore, the excess dimension d is determined according to the width of the jet to be obtained, that is to say the desired impact diameter. More precisely, the dimension d is chosen all the more low as the jet to be obtained is wide, and vice versa.

Sur la figure 5 est représentée schématiquement une tête de pulvérisation 10 pour un pistolet d'application d'un produit de revêtement plus perfectionné que celui des figures 1 à 3. Dans la suite de la description, les éléments analogues à ceux du pistolet illustré aux figures 1 à 3 conservent leur référence numérique, alors que les autres éléments portent d'autres références numériques. Par souci de concision, seules les différences par rapport au mode de réalisation des figures 1 à 3 sont mentionnées ci-dessous.On the figure 5 is schematically represented a spray head 10 for a gun application of a coating product more advanced than that of Figures 1 to 3 . In the rest of the description, the elements similar to those of the gun illustrated in the Figures 1 to 3 retain their numerical reference, while the other elements carry other numerical references. For the sake of brevity, only the differences with respect to the embodiment of the Figures 1 to 3 are mentioned below.

La cote d a également une influence sur le diamètre de l'impact rond appliqué sur une pièce. Plus précisément, le diamètre de l'impact est l'autant plus large que la cote d est choisie faible.The dimension d also influences the diameter of the round impact applied to a part. Specifically, the diameter of the impact is as wide as the dimension d is chosen low.

Le pistolet de la figure 5 se distingue de celui représenté aux figures 1 à 3 en ce que la valeur de la cote d de dépassement axial de l'injecteur 12 par rapport au chapeau 14 peut être réglée par le peintre. Avantageusement, le réglage de la cote d peut être effectué uniquement entre deux valeurs : une cote minimale dmin et une cote maximale dmax, comme envisagé ci-dessus.The gun of the figure 5 differs from that shown in Figures 1 to 3 in that the value of the axial overflow dimension d of the injector 12 relative to the cap 14 can be adjusted by the painter. Advantageously, 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.

Dans l'exemple, une douille 19 comportant, sur sa surface extérieure, un filetage carré 190, est immobilisée par rapport au corps 20 au moyen d'une bague de serrage 22, qui est vissée à demeure autour du corps 20 et qui est liée en translation avec la bague 22 par coopération entre une collerette extérieure de la douille 19 et une lèvre intérieure de la bague 22. Le chapeau 14 comprend des rainures 141 complémentaires du filetage carré 190 de la douille 19. Le chapeau 14 peut donc être plus ou moins vissé autour de la douille immobile 19, en fonction de la cote d désirée. Il est donc possible de régler la cote d en fonction du diamètre de l'impact désiré, et ceci sans nuire au bon fonctionnement du pistolet. Avantageusement, le filetage carré 190 de la douille 19 est dimensionné pour de déplacer le chapeau 14, selon l'axe X-X', entre une position reculée et une position avancée. En position avancée, la cote de dépassement axial d de l'injecteur 12 par rapport au chapeau 14 correspond à la cote minimale admissible dmin, alors qu'en position reculée, la cote d correspond à la cote maximale admissible dmax. Ainsi, le peintre ne risque pas de faire fonctionner le pistolet en mode dégradé en sélectionnant une cote inférieure à la cote minimale admissible, dmin, ou supérieure à la cote maximale admissible, dmax.In the example, a sleeve 19 having, on its outer surface, a square thread 190, is immobilized relative to the body 20 by means of a clamping ring 22, which is screwed permanently around the body 20 and which is connected in translation with the ring 22 by cooperation between an outer collar 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 be more or less screwed around the stationary sleeve 19, depending on the desired dimension d. It is therefore possible to adjust the dimension d depending on the diameter of the desired impact, and this without affecting the proper operation of the gun. Advantageously, the square thread 190 of the sleeve 19 is sized to move the cap 14, along the axis X-X ', between a retracted position and an advanced position. In the advanced position, the axial overflow dimension d of the injector 12 relative to the cap 14 corresponds to the minimum allowable dimension dmin, while in the retracted position, the dimension d corresponds to the maximum admissible dimension dmax. Thus, the painter is not likely to operate the pistol in degraded mode by selecting a rating lower than the minimum allowable rating, dmin, or higher than the maximum allowable rating, dmax.

Ainsi, pour augmenter la largeur de l'impact, le peintre dévisse le chapeau 14 pour réduire la cote d et pour réduire la dimension de l'impact, le peintre visse le chapeau 14 pour augmenter la cote d de dépassement de l'injecteur 12 par rapport au chapeau 14. La dimension de l'impact peut alors être réglée sans l'aide d'un jet d'air additionnel dit « vortex ».Thus, to increase the width of the impact, 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 overflow of the injector 12 relative to the hat 14. The dimension of the impact can then be adjusted without the aid of an additional air jet called "vortex".

Le procédé de fabrication du pistolet de la figure 5 comprend avantageusement une étape consistant à régler la cote d, ainsi que les cotes minimale et maximale dmin et dmax.The manufacturing process of the gun of the figure 5 advantageously comprises a step of adjusting the dimension d, as well as the minimum and maximum dimensions dmin and dmax.

Sur les figures 7 et 8 est représenté un troisième mode de réalisation de l'invention. Dans la suite de la description, les éléments analogues à ceux du pistolet illustré aux figures 5 et 6 conservent leur référence numérique, alors que les autres éléments portent d'autres références numériques. Par souci de concision, seules les différences par rapport au mode de réalisation des figures 5 et 6 sont mentionnées ci-dessous.On the Figures 7 and 8 is shown a third embodiment of the invention. In the rest of the description, the elements similar to those of the gun illustrated in the figures 5 and 6 retain their numerical reference, while the other elements carry other numerical references. For the sake of brevity, only the differences with respect to the embodiment of the figures 5 and 6 are mentioned below.

Le pistolet des figures 7 et 8 diffère de celui des figures 5 et 6 en ce que le réglage de la cote d est effectuée de manière automatique, et non plus manuelle. En effet, la tête de pulvérisation comprend des moyens de réglage automatique de la cote d de dépassement de l'injecteur 12 par rapport au chapeau 14. Ces moyens comprennent un moteur M monté sur la surface extérieure du corps 20, un pignon 50 entrainé par le moteur M au moyen d'un arbre de transmission 52 et une roue dentée 54, qui est en engrenage avec le pignon 50 et qui est solidaire en rotation avec le chapeau 14. Ainsi, la rotation du moteur M entraine automatiquement la rotation du chapeau 14 et le déplacement du chapeau 14 parallèlement à l'axe X-X'.The pistol Figures 7 and 8 differs from that of figures 5 and 6 in that the adjustment of the dimension d is performed automatically, and no longer manually. Indeed, the spray head comprises means for automatically adjusting the dimension d of overflow 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 gear with the pinion 50 and which is integral in rotation with the cap 14. Thus, 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 '.

Avantageusement, le moteur M est un moteur pneumatique, mais il peut également s'agir d'un moteur électrique, par exemple un moteur pas-à-pas.Advantageously, the motor M is a pneumatic motor, but it can also be an electric motor, for example a stepper motor.

Par ailleurs, une réglette 56 inscrite sur la surface extérieure du chapeau 14 permet au peintre de connaitre la valeur de la cote d de dépassement de l'injecteur 12 par rapport au chapeau 14. Cette réglette s'étend de manière périphérique autour de l'axe de pulvérisation X-X'.Furthermore, a strip 56 inscribed on the outer surface of the cap 14 allows the painter to know the value of the dimension d of overflow of the injector 12 relative to the cap 14. This strip extends peripherally around the X-X 'spraying axis.

Sur les figures 9 et 10 est représenté un quatrième mode de réalisation de l'invention. Dans la suite de la description, les éléments analogues à ceux du pistolet illustré aux figures 7 et 8 conservent leur référence numérique, alors que les autres éléments portent d'autres références numériques. Par souci de concision, seules les différences par rapport au mode de réalisation des figures 7 et 8 sont mentionnées ci-dessous.On the Figures 9 and 10 is shown a fourth embodiment of the invention. In the rest of the description, the elements similar to those of the gun illustrated in the Figures 7 and 8 retain their numerical reference, while the other elements carry other numerical references. For the sake of brevity, only the differences with respect to the embodiment of the Figures 7 and 8 are mentioned below.

Le pistolet conforme au quatrième mode de réalisation se distingue de celui du deuxième et du troisième mode de réalisation par le fait que le chapeau 14 est monté coulissant par rapport au corps 20 de la tête de pulvérisation 10. Plus précisément, le chapeau 14 peut être déplacé en translation selon l'axe de pulvérisation X-X' et est immobile en rotation autour de cet axe X-X'. Dans l'exemple, des billes 58 permettent de faire rouler le chapeau 14 autour du corps 20.The gun according to the fourth embodiment differs from that of the second and third embodiments in that the cap 14 is slidably mounted relative to the body 20 of the spray head 10. More specifically, the cap 14 can be moved in translation along the axis of spray XX 'and is stationary in rotation about this axis X-X'. In the example, balls 58 make it possible to roll the cap 14 around the body 20.

Le pistolet comprend des moyens pour déplacer automatiquement le chapeau 14 en translation par rapport à l'injecteur 12. Ces moyens incluent un vérin 60, qui est fixé sur la surface extérieure du corps 20. Ce vérin peut être du type pneumatique ou électrique et actionne une tige de vérin 62, laquelle est fixée par une de ses extrémités au chapeau 14.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 on the outer surface of the body 20. This jack can be of the pneumatic or electric type and operates a cylinder rod 62, which is fixed at one end to the cap 14.

Une réglette 56 est inscrite sur la surface extérieure du corps 20. Cette réglette 56 indique au peintre la valeur de la cote d sélectionnée. Cette réglette 56 forme des moyens extérieurs de repérage de la cote d avec laquelle l'injecteur 12 dépasse par rapport au chapeau 14.A strip 56 is inscribed on the outer surface of the body 20. This strip 56 indicates to the painter the value of the dimension d selected. This strip 56 forms external means for marking the dimension d with which the injector 12 protrudes with respect to the cap 14.

Le pistolet automatique des figures 7 à 10 est conçu pour équiper une installation d'application automatique d'un produit de revêtement sur des pièces convoyées, comme des carrosseries de véhicule. Le diamètre de l'impact du pulvérisateur peut alors être réglé de manière numérique par un opérateur, par exemple en agissant sur un ordinateur, en fonction du gabarit de la pièce à revêtir.The automatic pistol Figures 7 to 10 is designed to equip an installation of 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.

Le diamètre de l'impact du pulvérisateur peut aussi être réglé de manière automatique, auquel cas l'installation comprend un détecteur de gabarit des pièces convoyées et une unité électronique de commande. Une telle installation est par exemple décrite dans FR1551330 . L'unité électronique de commande ajuste alors la cote d de chaque pistolet en fonction du gabarit de la pièce et/ou de la position du pistolet sur sa trajectoire.The diameter of the impact of the sprayer can also be adjusted automatically, in which case the installation comprises a conveyor part gauge detector 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 jig of the part and / or the position of the gun on its trajectory.

En variante non représentée, un autre système peut être utilisé pour régler la cote de dépassement d. En particulier, le système peut permettre de déplacer l'injecteur 12 par rapport au chapeau 14.Alternatively not shown, another system can be used to set the overshoot rating d. In particular, the system can make it possible to move the injector 12 relative to the cap 14.

En variante non représentée, applicable au quatrième mode de réalisation, le chapeau 14 est déplacé manuellement par rapport à l'injecteur 12, c'est-à-dire que le pistolet ne comprend pas de moyens pour déplacer automatiquement le chapeau 14. Le peintre manipule alors directement le chapeau 14 avec ses mains. Pour ce faire, le pistolet comprend des moyens pour bloquer le chapeau 14 en translation lorsque le peintre a atteint la valeur de cote d désirée. Ces moyens sont par exemple formés par un système à cliquet anti-retour.In variant not shown, applicable to the fourth embodiment, 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 hat 14 with his hands. To do this, the gun comprises means for locking the cap 14 in translation when the painter has reached the value of dimension d desired. These means are for example formed by a non-return ratchet system.

En variante non représentée, l'intervalle I sur lequel est choisie la cote d est délimité entre une cote minimale dmin et une cote maximale dmax déterminées numériquement en fonction du diamètre D de l'injecteur 12.As a variant not shown, the interval I on 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.

Les caractéristiques des modes de réalisation et variantes envisagés ci-dessus peuvent être combinées entre elles pour générer de nouveaux modes de réalisation de l'invention. En particulier, le pistolet du mode de réalisation des figures 1 à 3 peut être modifié pour pouvoir régler la cote d de dépassement de l'injecteur 12 par rapport au chapeau 14, ceci de manière manuelle comme aux figures 5 et 6 ou de manière automatique comme aux figures 7 à 10.The features of the embodiments and alternatives contemplated above may be combined with one another to generate new embodiments of the invention. In particular, the pistol of the embodiment of Figures 1 to 3 may be modified to be able to adjust the dimension d of overflow of the injector 12 relative to the cap 14, this manually as to the figures 5 and 6 or automatically Figures 7 to 10 .

Claims (12)

Procédé de fabrication d'un pistolet (2) pour l'application d'un produit de revêtement, ce pistolet comprenant un injecteur (12) pour pulvériser un jet rond selon un axe de pulvérisation (X-X') et un chapeau (14) agencé coaxialement autour de l'injecteur, ce chapeau étant prévu pour former une lame d'air autour du jet, ce procédé étant caractérisé en ce qu'il comprend une étape a) consistant à dimensionner une cote (d) de dépassement axial de l'injecteur (12) par rapport au chapeau (14) en fonction du diamètre (D) de l'injecteur.A method of manufacturing a gun (2) for applying a coating material, said gun comprising an injector (12) for spraying a round jet along a spraying axis (X-X ') and a cap (14 ) arranged coaxially around the injector, this cap being provided to form an air gap around the jet, this method being characterized in that it comprises a step a) of dimensioning a dimension (d) of axial overrange of the injector (12) with respect to the cap (14) as a function of the diameter (D) of the injector. Procédé selon la revendication 1, caractérisé en ce que, à l'étape a), la cote de dépassement (d) est sélectionnée sur un intervalle (I) délimité entre une cote minimale (dmin) et une cote maximale (dmax) déterminées expérimentalement en fonction du diamètre (D) de l'injecteur (12).Method according to Claim 1, characterized in that , in step a), the overflow dimension (d) is selected over an interval (I) delimited between a minimum dimension (dmin) and a maximum dimension (dmax) determined experimentally. depending on the diameter (D) of the injector (12). Procédé selon la revendication 1 ou 2, caractérisé en ce que, à l'étape a), la cote de dépassement (d) est déterminée en fonction de la largeur du jet à obtenir.Method according to claim 1 or 2, characterized in that , in step a), the overflow dimension (d) is determined as a function of the width of the jet to be obtained. Procédé selon la revendication 3, caractérisé en ce que, à l'étape a), la cote de dépassement (d) est choisie d'autant plus faible que le jet à obtenir est large.Process according to claim 3, characterized in that , in step a), the overshoot dimension (d) is chosen all the lower as the jet to be obtained is wide. Procédé selon l'une des revendications précédentes, caractérisé en ce que le rapport entre la cote de dépassement (d) et le diamètre (D) de l'injecteur est sélectionné dans une surface définie entre : - un premier tronçon (T1) de pente nulle, - un deuxième tronçon (T2) de pente négative, - un troisième tronçon (T3) de pente négative et inférieure, en valeur absolue, à la pente du deuxième tronçon, - un quatrième tronçon (T4) de pente nulle, - un cinquième tronçon (T5) vertical, correspondant à une valeur limite supérieure pour le diamètre (D) de l'injecteur, - un sixième tronçon (T3') de pente négative, - un septième tronçon (T2') de pente négative, et inférieure, en valeur absolue, à la pente du sixième tronçon, - un huitième tronçon (T1') de pente nulle, et - un neuvième tronçon (T6) vertical, correspondant à une valeur limite inférieure pour le diamètre (D) de l'injecteur. Method according to one of the preceding claims, characterized in that the ratio between the overflow dimension (d) and the diameter (D) of the injector is selected from a surface defined between: a first section (T1) of zero slope, a second section (T2) of negative slope, a third section (T3) of negative and lower slope, in absolute value, at the slope of the second section, a fourth section (T4) of zero slope, a fifth section (T5) vertical, corresponding to an upper limit value for the diameter (D) of the injector, a sixth section (T3 ') of negative slope, - a seventh section (T2 ') of negative slope, and lower, in absolute value, at the slope of the sixth section, an eighth section (T1 ') of zero slope, and - A ninth section (T6) vertical, corresponding to a lower limit value for the diameter (D) of the injector. Pistolet (2) d'application d'un produit de revêtement, comprenant - un injecteur (12) pour projeter un jet rond selon un axe de pulvérisation (X-X'), - un chapeau (14) agencé coaxialement autour de l'injecteur, prévu pour former une lame d'air autour du jet, caractérisé en ce que l'injecteur dépasse axialement par rapport au chapeau, et en ce que la cote (d) de dépassement axial de l'injecteur (12) par rapport au chapeau (14) peut être réglée entre une valeur minimale (dmin) et une valeur maximale (dmax) déterminées en fonction du diamètre (D) de l'injecteur (12).Pistol (2) for applying a coating product, comprising an injector (12) for projecting a round jet along a spraying axis (X-X '), a cap (14) arranged coaxially around the injector, designed to form an air gap around the jet, characterized in that the injector protrudes axially with respect to the cap, and that the axial overflow dimension (d) of the injector (12) relative to the cap (14) can be adjusted between a minimum value (dmin) and a maximum value (dmax) determined according to the diameter (D) of the injector (12). Pistolet selon la revendication 6, caractérisé en ce que le chapeau (14) est mobile axialement en translation par rapport à un corps (20) du pistolet.Pistol according to claim 6, characterized in that the cap (14) is axially movable in translation relative to a body (20) of the gun. Pistolet selon la revendication 7, caractérisé en ce que le pistolet comprend des moyens (58, 60, 62) pour déplacer automatiquement le chapeau (14) en translation par rapport à l'injecteur (12).Pistol according to claim 7, characterized in that the gun comprises means (58, 60, 62) for automatically moving the cap (14) in translation relative to the injector (12). Pistolet selon la revendication 6, caractérisé en ce le chapeau (14) est vissé sur une douille (19) immobile du pistolet, le réglage de la cote (d) étant effectuée par vissage ou dévissage du chapeau (14) autour de l'axe de pulvérisation (X-X').Pistol according to claim 6, characterized in that the cap (14) is screwed onto a socket (19) stationary gun, the setting of the dimension (d) being performed by screwing or unscrewing the cap (14) about the axis spraying (X-X '). Pistolet selon la revendication 9, caractérisé en ce que le pistolet comprend des moyens (M, 50, 52, 54) pour visser et dévisser automatiquement le chapeau (14).Pistol according to claim 9, characterized in that the gun comprises means (M, 50, 52, 54) for automatically screwing and unscrewing the cap (14). Pistolet selon la revendication 10, caractérisé en ce que les moyens comprennent un moteur (M), un pignon (50) apte à être entrainé en rotation par le moteur et une roue dentée (54) engrenée avec le pignon et solidaire en rotation avec le chapeau (14).Pistol according to claim 10, characterized in that the means comprise a motor (M), a pinion (50) adapted to be rotated by the motor and a toothed wheel (54) meshing with the pinion and integral in rotation with the hat (14). Pistolet selon l'une quelconque des revendications 6 à 11, caractérisé en ce que le chapeau (14) délimite une chambre (V14), dans laquelle débouchent au moins un passage (130) d'air dirigé axialement et au moins un passage (134) d'air dirigé selon une direction sensiblement orthoradiale par rapport à l'axe de pulvérisation (X-X').Pistol according to any one of claims 6 to 11, characterized in that the cap (14) delimits a chamber (V14) into which at least one passage (130) of air directed axially and at least one passage (134) ) air directed in a direction substantially orthoradial with respect to the spray axis (X-X ').
EP16192308.1A 2015-10-06 2016-10-05 Process for manufacturing a coating gun and coating gun Active EP3153239B1 (en)

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KR102600122B1 (en) * 2019-07-18 2023-11-07 주식회사 엘지화학 Coaxial Nozzle for Solution Blow Spinning with Support members
US11911787B1 (en) 2019-08-16 2024-02-27 Gary Hammerlund Split manifold and method for multiple part fluid applications

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FR2281906A1 (en) * 1974-08-12 1976-03-12 Bing & Grondahl Porcelainfab PROCESS FOR GLAZING PORCELAIN AND SPRAYING HEAD FOR IMPLEMENTING THIS PROCESS
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FR3009688A1 (en) 2013-08-13 2015-02-20 Sames Technologies SPRAYER OF A LIQUID COATING PRODUCT AND SPRAY INSTALLATION COMPRISING SUCH A SPRAYER

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FR3041885A1 (en) 2017-04-07
FR3041885B1 (en) 2019-07-26
KR20170041157A (en) 2017-04-14
CN106560253B (en) 2021-02-12
JP2017070945A (en) 2017-04-13
US20170095823A1 (en) 2017-04-06
CN106560253A (en) 2017-04-12
ES2835859T3 (en) 2021-06-23

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