EP0404702A1 - Paint diffusing device - Google Patents

Paint diffusing device Download PDF

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Publication number
EP0404702A1
EP0404702A1 EP90430014A EP90430014A EP0404702A1 EP 0404702 A1 EP0404702 A1 EP 0404702A1 EP 90430014 A EP90430014 A EP 90430014A EP 90430014 A EP90430014 A EP 90430014A EP 0404702 A1 EP0404702 A1 EP 0404702A1
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EP
European Patent Office
Prior art keywords
air
conduits
head
paint
distributor
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.)
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Application number
EP90430014A
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German (de)
French (fr)
Inventor
Maxime Robles
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.)
Volumair France SA
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Volumair France SA
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Publication date
Application filed by Volumair France SA filed Critical Volumair France SA
Publication of EP0404702A1 publication Critical patent/EP0404702A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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
    • B05B7/0081—Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan
    • 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

Definitions

  • the present invention relates to a paint diffuser device.
  • the technical sector of the invention is that of manual or remote-controlled apparatus and equipment for the projection of all liquid or pasty products such as paints, plasters and the like.
  • paint is used in the present description to denote any of these products.
  • Some spray guns have a diffusion head specially designed to spray paint on flat jets. Others to broadcast round jets. Still others for diffusing flat or round jets, but the diffusion of flat jets alternately at 90 °, or round jets, requires direct intervention on the diffusion head, the operator having to turn said head according to fractions of a turn , to change the shape of the jet or change the head depending on the work to be done.
  • the units found in the paint shops of large firms such as for example, but not exclusively, the automobile industry, are equipped with guns mounted on robots managed by computer processing, whose arms execute the movements necessary for covering of the parts to be painted.
  • the evolution of the arm in the environment of the robot which can present a danger for the personnel of the unit, the zone where the robots are installed is delimited by a protective barrier which can only be crossed after stopping the installation.
  • the present invention aims to remedy these drawbacks.
  • the objective to be achieved is the implementation of manual or remotely controlled devices and equipment, allowing the operator or from a program managed by a computer processing machine, to modify at will the shape and the orientation of the paint jets, without manual intervention on the diffusion head and correspondingly without the need to interrupt the painting operation.
  • the paint diffusing device comprising a body, comprising a supply of paint and at least one supply of compressed air and at its front end a diffusion head for spraying the paint in the form of jets.
  • a body comprising a supply of paint and at least one supply of compressed air and at its front end a diffusion head for spraying the paint in the form of jets.
  • said diffusion head is fixedly mounted on said body and comprises four air diffusing ducts, the outlet openings of which are arranged at 90 ° from one another, the axes of said ducts converging on a point 0 located on the longitudinal axis of the head in front of it and are connected to air distributor-regulating means actuated by a control, to direct the air in one or the other set of two diametrically opposite conduits and obtaining flat jets of generally vertical or horizontal orientation, or for stopping the arrival of air in said conduits and obtaining round jets.
  • the head broadcast comprises a first cylindrical cavity coaxial with said head and opening into said annular chamber, the bottom of said cavity is frustoconical and comprises a circular orifice coaxial with said cavity, and a second frustoconical cavity coaxial with said head and open at the front of the latter, the wall of which diverges from the rear towards the front and where said air diffusing ducts open, which circular orifice is common to said cavities.
  • said nozzle has a conical end whose generatrices converge on the longitudinal axis of the head and in which the nozzle is arranged the needle, said conical end is substantially parallel to the frustoconical bottom of said first cavity and is distant thereof to provide an annular space for the passage of the paint spraying air around the needle and through said circular orifice.
  • the end of the needle enters said circular orifice, the edge of which is flared on the side of said second frustoconical cavity, and each air diffusing duct opens into the conical bottom of a tapped cylindrical hole to receive a tube connection.
  • Said conduits and said threaded holes are coaxial and inclined at an angle ⁇ of between 50 ° and 62 ° preferably 60 ° relative to the longitudinal axis of the diffusion head and their outlet orifices are equidistant from the longitudinal axis of the head.
  • a device where said body comprises a compressed air inlet connected to a high-pressure air motor compressor unit for actuating said needle
  • a device is controlled remotely by an air distributor-regulator connected to said body by flexible tubing, for supplying said annular chamber with vehicle air and for spraying paint and the diffusion head is connected to said distributor-regulator by four flexible tubings fixed to said tube connections, for supplying said air ducts two by two diametrically opposite compressed two by two, which regulator distributor is itself connected to a low-pressure air turbo-compressor or to said high-pressure air motor-compressor unit and further comprises means for stopping the supply of air from said diffusing ducts.
  • the air distributor-regulator comprises a central channel leading to a bushel of a three-way tap in which is rotatably mounted a key comprising control means and in which bushel opens two diametrically opposite lateral conduits and extending at 90 ° to said central channel, which is connected by its end opposite to said plug, to said turbo-compressor or to said motor-compressor group, which distributor further comprises a lateral channel terminating in said central channel, which lateral channel is connected through air regulating means to said annular chamber of said body , to bring the atomizing air into the diffusion head and each of said lateral conduits is connected by a connector with two outlets to one of said sets of two air diffusing conduits of the diffusion head.
  • Said air distributor-regulator further comprises, in line with each of said conduits, a micrometric screw for modifying the cross-section of the air passage in said conduits.
  • said key comprises a shoulder situated opposite the edge of said bottom, and opposite said shoulder an axis coaxial with the key, to which axis said control means are attached, which hold the key in position in the plug, in combination with said shoulder.
  • the key further comprises at least two peripheral grooves, perpendicular to the axis of revolution of the key, located on either side of said lateral conduits and of said central channel and in which grooves are arranged seals for sealing in the bushel.
  • the result of the invention is a manual or remote-controlled device or equipment which makes it possible to modify the orientation and the shape of the paint jets, by means of a fixed diffusion head, comprising two sets of two diffusing conduits supplied alternately with the during regular or irregular periods of time and requiring no interruption of operation.
  • the shape of the spray jet is varied gradually and progressively by the operator, either directly on the paint gun or on the distributor-regulator unit, for adjusting the air supply to the diffuser ducts and from the central orifice of the diffusion head.
  • the diffusion head according to the invention can equally equip either a manual paint spray gun or a remote-controlled paint diffusion device of the type found in industry and which equip robotic paint units.
  • the air for diffusing the paint, and for orienting and modifying the shape of the jets can either be air at low pressure, of the order of 0.5 bar. produced by a turbo-compressor, i.e. high pressure compressed air between 3 and 8 bars produced by a compressor unit.
  • the operating principle is the same, only the air passage sections of the different components will be adapted according to the pressure and the air volume.
  • the device shown in the drawing is of the remote control type, the air for diffusing and orienting and modifying the shape of the jets is at low pressure, while the air which controls the movement of the needle in the painting for interrupt the spraying of the paint or adjust its flow, is at high pressure.
  • FIG. 2 of the drawing represents a paint diffusing device comprising a body 1 at one end of which a diffusion head is fixed 2.
  • a device is adapted to be mounted on the arm of a robot or on a back and forth paint device.
  • Said body is of a generally cylindrical configuration and comprises in its central part and on the side of the head 2, an annular low-pressure air chamber delimited by a peripheral wall 1b and a paint duct 1c.
  • the chamber 1a is open at the end 1d of the body.
  • the conduit 1c takes the form of a cylindrical tube extending, beyond the end 1d of the body 1, in the diffusion head 2 and comprises at its front part a nozzle 3 screwed into said conduit. Inside thereof is arranged coaxially, a needle 4 constituted by a cylindrical rod whose slightly conical end 4a is passed through the also conical orifice of said nozzle 3. In the fully pushed back position on the side of the head 2 , the needle closes the opening of nozzle 3.
  • the paint is admitted into the conduit 1c by a nozzle connected to a reserve, by means of flexible tubing, as will be described later.
  • the needle 4 has at its part opposite its conical end 4a, a piston 5 which moves in a cylinder 6 which has at its periphery a threaded part 6a.
  • Said cylinder 6 is screwed inside a cylindrical housing 1f of the body 1. It comprises a first constriction 6b which enters a first cylindrical extension 1f1 of the housing 1f and a second constriction 6c which penetrates into a second additional cylindrical extension small section 1f2.
  • the bottom 1c1 of the conduit 1c is drilled to allow passage to the needle 4, which extends through a cylindrical conduit 6d coaxial with said constrictions 6b and 6c and which opens into a cylindrical housing 6e.
  • the sealing is carried out by means of linings, for example of leather, one of which 7 is placed in the bottom of the cylindrical constriction 1f2 by being inserted between the latter and the extension cylindrical 6c, to form a cable gland and the other 8 is arranged in the bottom of the housing 6e.
  • An O-ring 9 seals between the constriction 6b and the cylindrical extension 1f1, a second O-ring 10 between the cylinder 6 and the cylindrical housing 1f.
  • the seal between the bore of the cylinder 6 and the piston 5 is also achieved by means of an O-ring 11.
  • the cylinder 6 extends outside the body 1 and has a hexagonal part 6f to allow it to be put in place and tightened by means of a key.
  • an opposing spring 12 is placed, bearing on said piston and on a cap 13 screwed to the external end of the cylinder 6.
  • Said cap has a threaded central opening 13a. Coaxially and inside the spring 12, is placed a second spring 15 bearing on the bottom of the cap 13 and on a cup 16 fixed to the end of the needle 4 and on which the piston 5 is supported.
  • This screw comprises a knurled ring 14 which fulfills the function of a lock nut, to immobilize the screw 17 in position.
  • the high pressure compressed air is admitted into the cylinder 6 by conduits 6g which put said cylinder in communication with an annular chamber 1g in which a 1h tapping ends, connected to a motor-air compressor group, by a flexible tube. .
  • the attachment of this tubing to said 1 hour stitching is carried out in the manner of a three-piece connection 18.
  • the operation of the needle 4 is adjusted by acting on the stop screw 17 to adjust the stroke of the latter.
  • the adjustment is maintained by blocking the screw 17 by means of the ring 14.
  • the low pressure air is admitted into the chamber 1a by a nozzle 1j connected to a turbo-compressor, by a flexible tube which will be discussed later.
  • the end 1d of the body 1 is threaded at its external periphery onto which the diffusion head 2 is screwed.
  • the latter (FIGS. 3 and 4) consists of a hollow cylindrical part 2a, threaded at its internal periphery 2a1 and which surrounds the end 1d of the body 1, and of a frustoconical part 2b which diverges from the rear, from the part 2a, towards the front, which part 2b and chamfered in 2b1.
  • Said head 2 comprises coaxially with the parts 2a, 2b a first cylindrical cavity 2c, the bottom 2c1 of which is frustoconical and has a coaxial orifice 2d, and a second frustoconical cavity 2e open at the front of the head and whose wall 2e1 diverges from back to front.
  • the orifice 2d is common to the cavities 2c, 2e and the cavity 2c opens at the rear in the cylindrical recessed part 2a.
  • the cavity 2c opens into said annular chamber 1a of the body 1.
  • the conical end of the nozzle 3 is substantially parallel to the bottom 2c1 of the cylindrical cavity 2c and distant from the latter to provide an annular space 1g.
  • the orifices 2f1, 2f3 are located on the axis X, X1, the orifices 2f2, 2f4 on the axis Y, Y1, said axes X, X1 / Y, Y1 being perpendicular.
  • the conduits 2f converge on a point 0 located on the longitudinal axis Z, Z1 of the head 2 and are equidistant from this axis. Their inclination relative to the axis Z, Z1 is for example between 50 ° to 62 °. In one embodiment, the axes of the conduits form an angle ⁇ of 60 ° with the axis Z, Z1.
  • Said conduits open into tapped holes with a conical bottom 2g, coaxial with said conduits and into which tapped holes are screwed flexible tube fittings, connected to the turbo-compressor which supplies the air at low pressure.
  • a remote control paint diffuser device is shown in Figure 1.
  • the body 1 is fixed to a robot arm or to a "reciprocator" (not shown) by means of a screw passed through a hole 20 extending transversely to the body 1.
  • a robot arm or to a "reciprocator" (not shown) by means of a screw passed through a hole 20 extending transversely to the body 1.
  • Said body can also be wedged on an axis rotatably mounted at the end of the robot arm, for example to orient the body and the diffusion head during the painting operation.
  • Said body 1 is connected by a flexible tube 22, to a paint reserve (not shown), which supplies the central duct 1c.
  • the tubing 22 is connected to the nozzle, by means of a tube connector, for example called a "three-piece connector" 23.
  • the body 1 is also connected by a flexible tube 24, to a distributor-regulator 25. Said tube is connected by means of quick couplings 26, 27, to the nozzle 1j of the body 1 and to the regulator 251 of the distributor.
  • the distributor-regulator 25 ( Figures 1 and 5 to 8) is for example of a generally parallelepiped shape and has on its longitudinal axis a central channel 25a, which is cylindrical and has at one of its ends, a constriction 25b which opens into a cylindrical bore 25c, which passes right through the distributor perpendicular to its large faces 25d, 25e, which bore constitutes the bushel of a three-way valve.
  • the central channel 25a comprises, opposite the constriction 25b, an enlarged cylindrical inlet 25f tapped on its internal part, to receive a tube connector 28, connected to said turbo-compressor (not shown) which supplies compressed air at low pressure. .
  • the distributor 25 further comprises a lateral channel 25g which terminates in said central channel 25a, which lateral channel has an enlarged threaded inlet 25h and in which said air regulator 251 is screwed, which makes it possible to regulate the air flow at low pressure admitted into the annular chamber la of the body 1.
  • the face 25d comprises, to the right of the central channel 25a, a tapped hole 25j into which is screwed a pressure gauge 29 which indicates the pressure of the air admitted into the distributor.
  • the distributor 25 also comprises two lateral conduits 25k, 251 coaxial and diametrical, perpendicular to the axis of the central channel 25a, which conduits 25k, 251 open into said plug 25c.
  • Said conduits extend from the plug 25c to the lateral faces 25m, 25n of the distributor and are tapped at the level of said faces at 25p, 25q to each receive a connector with two outlets 30, 31 screwed into the tapped part of the conduits.
  • connection 30, 31 is connected by flexible tubes 33, 34 - 35, 36 to said sets of two air diffusing conduits, by means of quick connectors 37 screwed into the tapped holes 2g of the diffusion head 2.
  • a cylindrical key 38 comprising in known manner a communication conduit bent at 90 °, 38a of the same diameter as that of the constriction 25b and the lateral conduits 25k, 251.
  • the axes of the conduits 38a, 25k, 251 and the constriction 25b are located in the same plane.
  • the key 38 has at its lower part a rim 38b forming a peripheral shoulder coming to bear on the face 25e of the dispenser and at its upper part a coaxial axis 38c. On the axis 38c is fixed, for example by means of a mechanical pin 39, a control handle 40.
  • the key On either side of the bent conduit 38a, the key comprises two peripheral grooves 38d, 38e perpendicular to the axis of revolution of the key 38. in which grooves are placed two O-rings 41, 42 which realize the seal between the plug 25c and the key 38.
  • the face 25d of the dispenser further comprises and in line with each of the lateral conduits 25k, 251, a tapped hole 25r, 25s with micrometric pitch and into which micrometric screws 43, 44 are screwed.
  • the function of these screws is to modify the section conduits 25k, 251 in order to regulate the air flow at low pressure sent into the pairs of diffusing conduits 2f1, 2f3 - 2f2, 2f4 from head 2 through the supply pipes of said head 33, 34, 35, 36 in order to allow the width of the flat jets to be adjusted.
  • the regulator 251 also makes it possible to adapt the flow rate of the vehicle air at low pressure and of atomization of the paint, via the tube 24 and the body 1 of the device and correlatively the flow rate of the paint, according to the work to be carried out .

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Abstract

The device according to the invention comprises a body (1) comprising a paint feed (1e) and at least one compressed-air feed (1j, 1h) and a diffusion head (2) for spraying the paint in the form of round or flattened jets and is characterised by the fact that the said diffusion head (2) is mounted so as to be fixed to the said body (1) and comprises four air-diffuser pipes (2f) whose outlet orifices (2f to 2f4) are disposed at 90 DEG to one another, the axes of the said pipes converging onto a point O located on the longitudinal axis (Z, Z1) of the head and in front of the latter, and are connected to directional control air-valve means (25, 251) actuated by a control device (40) for directing the air into one or other set of two diametrally opposed pipes and for obtaining flattened jets of vertical or horizontal general orientation or for stopping the air inlet in the pipes and for obtaining round jets. Finds its application, especially, in hand-held paint guns or in remote-controlled and robotised painting equipment. <IMAGE>

Description

La présente invention a pour objet un dispositif diffuseur de peinture.The present invention relates to a paint diffuser device.

Le secteur technique de l'invention est celui des appareils et équipements manuels ou télécommandés pour la projection de tous produits liquides ou pâteux tels que des peintures, crépis et similaires.The technical sector of the invention is that of manual or remote-controlled apparatus and equipment for the projection of all liquid or pasty products such as paints, plasters and the like.

Le terme peinture est utilisé dans la présente description pour désigner l'un quelconque de ces produits.The term paint is used in the present description to denote any of these products.

On connait actuellement de tels appareils encore appelés pistolets et comportant à leur extrémité avant, un gicleur pour le passage de la peinture et une tête de diffusion, qui permet la pulvérisation de celle-ci sous la forme de jets ronds ou aplatis.Currently known such devices also called guns and having at their front end, a nozzle for the passage of paint and a diffusion head, which allows the spraying thereof in the form of round or flattened jets.

Certains pistolets comportent une tête de diffusion spécialement conçue pour pulvériser la peinture selon des jets plats. D'autres pour diffuser des jets ronds. D'autres encore pour diffuser des jets plats ou ronds, mais la diffusion des jets plats alternativement à 90°, ou des jets ronds, nécessite une intervention directe sur la tête de diffusion, l'opérateur devant tourner ladite tête selon des fractions de tour, pour modifier la forme du jet ou encore changer la tête en fonction du travail à accomplir.Some spray guns have a diffusion head specially designed to spray paint on flat jets. Others to broadcast round jets. Still others for diffusing flat or round jets, but the diffusion of flat jets alternately at 90 °, or round jets, requires direct intervention on the diffusion head, the operator having to turn said head according to fractions of a turn , to change the shape of the jet or change the head depending on the work to be done.

Il résulte de cette technologie que l'appareil ou l'installation doit être arrêté pour réaliser cette manoeuvre.It follows from this technology that the apparatus or the installation must be stopped to perform this maneuver.

Si l'arrêt momentané d'un pistolet manuel n'entraîne pas de conséquences majeures, économiquement néfastes, au cours d'une opération de peinture, la question est tout autre pour les pistolets commandés à distance pour les ouvrages de peinture réalisés dans l'industrie, notamment dans la grande industrie ou les produits sont fabriqués en séries.If the temporary stopping of a manual spray gun does not lead to major, economically harmful consequences during a painting operation, the question is quite different for remotely controlled spray guns for painting works carried out in the industry, especially in large industry where products are mass produced.

Les unités que l'on trouve dans les ateliers de peinture des grosses firmes telles que par exemple, mais non exclusivement, l'industrie automobile, sont équipées de pistolets montés sur des robots gérés par traitement informatique, dont les bras exécutent les mouvements nécessaires au recouvrement des parties à peindre. L'évolution du bras dans l'environnement du robot pouvant présenter un danger pour le personnel de l'unité, la zone où sont installés les robots est délimitée par une barrière de protection qui ne peut être franchie qu'après arrêt de l'installation.The units found in the paint shops of large firms such as for example, but not exclusively, the automobile industry, are equipped with guns mounted on robots managed by computer processing, whose arms execute the movements necessary for covering of the parts to be painted. The evolution of the arm in the environment of the robot which can present a danger for the personnel of the unit, the zone where the robots are installed is delimited by a protective barrier which can only be crossed after stopping the installation.

Il en est de même pour les appareils à va et vient encore appelés dans le domaine de l'invention "réciprocators", bien que de tels appareils soient moins dangereux.It is the same for the reciprocating devices still called in the field of the invention "reciprocators", although such devices are less dangerous.

Dans l'état actuel de la technique connue, de telles installations doivent être arrêtées lorsqu'il doit être procédé au changement d'orientation des têtes de diffusion des pistolets.In the current state of the known art, such installations must be stopped when the orientation of the spray heads of the guns has to be changed.

Les arrêts des unités de peinture ralentissent les cadences de production.The shutdowns of the paint units slow down the production rates.

La présente invention vise à remédier à ces inconvénients.The present invention aims to remedy these drawbacks.

L'objectif à atteindre est la mise en oeuvre d'appareils et équipements manuels ou commandés à distance, permettant à l'opérateur ou à partir d'un programme géré par une machine à traitement informatique, de modifier à volonté la forme et l'orientation des jets de peinture, sans intervention manuelle sur la tête de diffusion et corrélativement sans qu'il soit nécessaire d'interrompre l'opération de peinture.The objective to be achieved is the implementation of manual or remotely controlled devices and equipment, allowing the operator or from a program managed by a computer processing machine, to modify at will the shape and the orientation of the paint jets, without manual intervention on the diffusion head and correspondingly without the need to interrupt the painting operation.

Cet objectif est atteint par le dispositif diffuseur de peinture selon l'invention, comprenant un corps, comportant une alimentation en peinture et au moins une alimentation en air comprimé et à son extrémité avant une tête de diffusion pour pulvériser la peinture sous la forme de jets ronds ou aplatis, caractérisé en ce que ladite tête de diffusion est montée fixe sur ledit corps et comporte quatre conduits diffuseurs d'air dont les orifices de sortie sont disposés à 90° l'un de l'autre, dont les axes desdits conduits convergent sur un point 0 situé sur l'axe longitudinal de la tête en avant de celle-ci et sont reliés à des moyens distributeurs-régulateurs d'air actionnés par une commande, pour diriger l'air dans l'un ou l'autre ensemble de deux conduits diamétralement opposés et obtenir des jets aplatis d'orientation généralement verticale ou horizontale, ou pour stopper l'arrivée d'air dans lesdits conduits et obtenir des jets ronds.This objective is achieved by the paint diffusing device according to the invention, comprising a body, comprising a supply of paint and at least one supply of compressed air and at its front end a diffusion head for spraying the paint in the form of jets. round or flattened, characterized in that said diffusion head is fixedly mounted on said body and comprises four air diffusing ducts, the outlet openings of which are arranged at 90 ° from one another, the axes of said ducts converging on a point 0 located on the longitudinal axis of the head in front of it and are connected to air distributor-regulating means actuated by a control, to direct the air in one or the other set of two diametrically opposite conduits and obtaining flat jets of generally vertical or horizontal orientation, or for stopping the arrival of air in said conduits and obtaining round jets.

Dans un tel dispositif où la peinture est amenée par un conduit comportant un ajutage et dont le débit est régulé par un pointeau et dont l'air de diffusion est amené jusqu'à la tête par une chambre annulaire extérieure et coaxiale audit conduit, la tête de diffusion comporte une première cavité cylindrique coaxiale à ladite tête et débouchant dans ladite chambre annulaire, dont le fond de ladite cavité est tronconique et comporte un orifice circulaire coaxial à ladite cavité, et une seconde cavité tronconique coaxiale à ladite tête et ouverte à l'avant de celle-ci, dont la paroi diverge de l'arrière vers l'avant et où débouchent lesdits conduits diffuseurs d'air, lequel orifice circulaire est commun auxdites cavités.In such a device where the paint is supplied by a conduit comprising a nozzle and whose flow rate is regulated by a needle and whose diffusion air is brought to the head by an annular chamber external and coaxial with said conduit, the head broadcast comprises a first cylindrical cavity coaxial with said head and opening into said annular chamber, the bottom of said cavity is frustoconical and comprises a circular orifice coaxial with said cavity, and a second frustoconical cavity coaxial with said head and open at the front of the latter, the wall of which diverges from the rear towards the front and where said air diffusing ducts open, which circular orifice is common to said cavities.

Dans le mode d'exécution où ledit ajutage comporte une extrémité conique dont les génératrices convergent sur l'axe longitudinal de la tête et dans lequel ajutage est disposé le pointeau, ladite extrémité conique est sensiblement parallèle au fond tronconique de ladite première cavité et est éloignée de celui-ci pour ménager un espace annulaire pour le passage de l'air de pulvérisation de la peinture autour du pointeau et à travers ledit orifice circulaire.In the embodiment where said nozzle has a conical end whose generatrices converge on the longitudinal axis of the head and in which the nozzle is arranged the needle, said conical end is substantially parallel to the frustoconical bottom of said first cavity and is distant thereof to provide an annular space for the passage of the paint spraying air around the needle and through said circular orifice.

Dans un mode de réalisation, l'extrémité du pointeau pénètre dans ledit orifice circulaire dont le bord est évasé du côté de ladite seconde cavité tronconique, et chaque conduit diffuseur d'air débouche dans le fond conique d'un trou cylindrique taraudé pour recevoir un raccord de tube.In one embodiment, the end of the needle enters said circular orifice, the edge of which is flared on the side of said second frustoconical cavity, and each air diffusing duct opens into the conical bottom of a tapped cylindrical hole to receive a tube connection.

Lesdits conduits et lesdits trous taraudés sont coaxiaux et inclinés suivant un angle α compris entre 50° et 62° de préférence 60° par rapport à l'axe longitudinal de la tête de diffusion et leurs orifices de sortie sont équidistants de l'axe longitudinal de la tête.Said conduits and said threaded holes are coaxial and inclined at an angle α of between 50 ° and 62 ° preferably 60 ° relative to the longitudinal axis of the diffusion head and their outlet orifices are equidistant from the longitudinal axis of the head.

Dans un dispositif où ledit corps comporte une arrivée d'air comprimé reliée à un groupe moto-compresseur d'air à haute pression pour actionner ledit pointeau, un tel dispositif est commandé à distance par un distributeur-régulateur d'air relié audit corps par une tubulure souple, pour alimenter ladite chambre annulaire en air véhicule et de pulvérisation de la peinture et la tête de diffusion est reliée audit distributeur-régulateur par quatre tubulures souples fixées auxdits raccords de tubes, pour alimenter deux à deux lesdits conduits diffuseurs d'air comprimé diamétralement opposés deux à deux, lequel distributeur régulateur est lui-même relié à un turbo-­compresseur d'air à basse pression ou audit groupe moto-compresseur d'air à haute pression et comporte en outre des moyens pour stopper l'alimentation en air desdits conduits diffuseurs.In a device where said body comprises a compressed air inlet connected to a high-pressure air motor compressor unit for actuating said needle, such a device is controlled remotely by an air distributor-regulator connected to said body by flexible tubing, for supplying said annular chamber with vehicle air and for spraying paint and the diffusion head is connected to said distributor-regulator by four flexible tubings fixed to said tube connections, for supplying said air ducts two by two diametrically opposite compressed two by two, which regulator distributor is itself connected to a low-pressure air turbo-compressor or to said high-pressure air motor-compressor unit and further comprises means for stopping the supply of air from said diffusing ducts.

Selon l'invention, le distributeur-régulateur d'air comporte un canal central aboutissant à un boisseau d'un robinet à trois voies dans lequel est monté tournante une clef comportant des moyens de commande et dans lequel boisseau débouche deux conduits latéraux diamétralement opposés et s'étendant à 90° dudit canal central, lequel est relié par son extrémité opposée audit boisseau, audit turbo-­compresseur ou audit groupe moto-compresseur, lequel distributeur comporte en outre un canal latéral aboutissant dans ledit canal central, lequel canal latéral est relié à travers des moyens régulateurs d'air à ladite chambre annulaire dudit corps, pour amener l'air de pulvérisation dans la tête de diffusion et chacun desdits conduits latéraux est relié par un raccord à deux sorties à un desdits ensembles de deux conduits diffuseurs d'air de la tête de diffusion.According to the invention, the air distributor-regulator comprises a central channel leading to a bushel of a three-way tap in which is rotatably mounted a key comprising control means and in which bushel opens two diametrically opposite lateral conduits and extending at 90 ° to said central channel, which is connected by its end opposite to said plug, to said turbo-compressor or to said motor-compressor group, which distributor further comprises a lateral channel terminating in said central channel, which lateral channel is connected through air regulating means to said annular chamber of said body , to bring the atomizing air into the diffusion head and each of said lateral conduits is connected by a connector with two outlets to one of said sets of two air diffusing conduits of the diffusion head.

Ledit distributeur-régulateur d'air comporte en outre au droit de chacun desdits conduits, une vis micrométrique pour modifier la section de passage de l'air dans lesdits conduits.Said air distributor-regulator further comprises, in line with each of said conduits, a micrometric screw for modifying the cross-section of the air passage in said conduits.

Dans un tel distributeur où le boisseau est cylindrique et à fond ouvert, ladite clef comporte un épaulement situé en regard du bord dudit fond, et à l'opposé dudit épaulement un axe coaxial à la clef, auquel axe sont fixés lesdits moyens de commande, lesquels maintiennent en position la clef dans le boisseau, en combinaison avec ledit épaulement. La clef comporte en outre, au moins deux gorges périphériques, perpendiculaires à l'axe de révolution de la clef, situées de part et d'autre desdits conduits latéraux et dudit canal central et dans lesquelles gorges sont disposés des joints pour réaliser l'étanchéité à l'air dans le boisseau.In such a distributor where the plug is cylindrical and with an open bottom, said key comprises a shoulder situated opposite the edge of said bottom, and opposite said shoulder an axis coaxial with the key, to which axis said control means are attached, which hold the key in position in the plug, in combination with said shoulder. The key further comprises at least two peripheral grooves, perpendicular to the axis of revolution of the key, located on either side of said lateral conduits and of said central channel and in which grooves are arranged seals for sealing in the bushel.

Le résultat de l'invention est un appareil ou un équipement manuel ou télécommandé qui permet de modifier l'orientation et la forme des jets de peinture, au moyen d'une tête de diffusion fixe, comprenant deux ensembles de deux conduits diffuseurs alimentés alternativement au cours de périodes de temps régulières ou irrégulières et ne nécessitant aucune interruption de fonctionnement.The result of the invention is a manual or remote-controlled device or equipment which makes it possible to modify the orientation and the shape of the paint jets, by means of a fixed diffusion head, comprising two sets of two diffusing conduits supplied alternately with the during regular or irregular periods of time and requiring no interruption of operation.

La variation de la forme du jet de pulvérisation, graduellement et progressivement, est réalisée par l'opérateur, soit directement sur le pistolet de peinture, soit sur le boîtier distributeur-régulateur, pour le réglage de l'alimentation en air des conduits diffuseurs et de l'orifice central de la tête de diffusion.The shape of the spray jet is varied gradually and progressively by the operator, either directly on the paint gun or on the distributor-regulator unit, for adjusting the air supply to the diffuser ducts and from the central orifice of the diffusion head.

D'autres avantages et les caractéristiques de l'invention ressortiront encore à la lecture de la description suivante d'un mode de réalisation non limitatif d'un dispositif diffuseur de peinture en référence au dessin annexé sur lequel:

  • - la figure 1 est une vue en perspective d'un dispositif selon l'invention dans un mode de réalisation à commande à distance ;
  • - la figure 2 est une vue en coupe longitudinale partielle du dispositif diffuseur représenté à la figure 1 ;
  • - la figure 3 est une demi-vue en coupe/demi-vue extérieure de la tête de diffusion qui équipe le dispositif des figures précédentes ;
  • - la figure 4 est une vue suivant la flèche F de la figure 3 ;
  • - la figure 5 est une vue en coupe du corps du distributeur-­régulateur suivant la ligne V V de la figure 6 ;
  • - la figure 6 est une vue en coupe du corps du distributeur-­régulateur suivant la ligne VI VI de la figure 5 ;
  • - la figure 7 est une vue en coupe du distributeur-régulateur suivant un plan passant par l'axe longitudinal du boisseau et de la clef qu'il contient ;
  • - la figure 8 est une vue en coupe transversale suivant un plan dans lequel sont situés les axes des conduits de communication de ladite clef.
Other advantages and characteristics of the invention will appear further on reading the following description of a nonlimiting embodiment of a paint diffuser device with reference to the appended drawing in which:
  • - Figure 1 is a perspective view of a device according to the invention in an embodiment with remote control;
  • - Figure 2 is a partial longitudinal sectional view of the diffuser device shown in Figure 1;
  • - Figure 3 is a sectional half-view / exterior half-view of the diffusion head which equips the device of the preceding figures;
  • - Figure 4 is a view along arrow F of Figure 3;
  • - Figure 5 is a sectional view of the body of the distributor-regulator along the line VV of Figure 6;
  • - Figure 6 is a sectional view of the body of the distributor-regulator along line VI VI of Figure 5;
  • - Figure 7 is a sectional view of the distributor-regulator along a plane passing through the longitudinal axis of the plug and the key it contains;
  • - Figure 8 is a cross-sectional view along a plane in which are located the axes of the communication conduits of said key.

La tête de diffusion selon l'invention peut indifféremment équiper soit un pistolet de peinture manuel, soit un dispositif diffuseur de peinture télécommandé du type de ceux que l'on trouve dans l'industrie et qui équipent les unités de peinture robotisées.The diffusion head according to the invention can equally equip either a manual paint spray gun or a remote-controlled paint diffusion device of the type found in industry and which equip robotic paint units.

On notera en préalable, que l'air de diffusion de la peinture, et de l'orientation et de la modification de la forme des jets peut indifféremment être soit de l'air à basse pression, de l'ordre de 0,5 bar produit par un turbo-compresseur, soit de l'air comprimé à haute pression comprise entre 3 et 8 bars produit par un groupe moto­compresseur. Le principe de fonctionnement est le même, seules les sections de passage d'air des différents composants seront adaptées en fonction de la pression et du volume d'air.It will be noted beforehand that the air for diffusing the paint, and for orienting and modifying the shape of the jets can either be air at low pressure, of the order of 0.5 bar. produced by a turbo-compressor, i.e. high pressure compressed air between 3 and 8 bars produced by a compressor unit. The operating principle is the same, only the air passage sections of the different components will be adapted according to the pressure and the air volume.

Le dispositif représenté au dessin est du type à commande à distance dont l'air de diffusion et d'orientation et de modification de la forme des jets est à basse pression, alors que l'air qui commande le déplacement du pointeau dans le conduit de peinture, pour interrompre la projection de la peinture ou régler son débit, est à haute pression.The device shown in the drawing is of the remote control type, the air for diffusing and orienting and modifying the shape of the jets is at low pressure, while the air which controls the movement of the needle in the painting for interrupt the spraying of the paint or adjust its flow, is at high pressure.

On se reporte d'abord à la figure 2 du dessin qui représente un dispositif diffuseur de peinture comportant un corps 1 à une extrémité duquel est fixée une tête de diffusion 2. Un tel dispositif est adapté pour être monté sur le bras d'un robot ou sur un appareil de peinture à va et vient.First, reference is made to FIG. 2 of the drawing which represents a paint diffusing device comprising a body 1 at one end of which a diffusion head is fixed 2. Such a device is adapted to be mounted on the arm of a robot or on a back and forth paint device.

Ledit corps est d'une configuration générale cylindrique et comporte dans sa partie centrale et du côté de la tête 2, une chambre annulaire d'air à basse pression la délimitée par une paroi périphérique 1b et un conduit de peinture 1c. La chambre 1a est ouverte à l'extrémité 1d du corps.Said body is of a generally cylindrical configuration and comprises in its central part and on the side of the head 2, an annular low-pressure air chamber delimited by a peripheral wall 1b and a paint duct 1c. The chamber 1a is open at the end 1d of the body.

Le conduit 1c adopte la forme d'un tube cylindrique s'étendant, au-delà de l'extrémité 1d du corps 1, dans la tête de diffusion 2 et comporte à sa partie antérieure un ajutage 3 vissé dans ledit conduit. A l'intérieur de celui-ci est disposé coaxialement, un pointeau 4 constitué par une tige cylindrique dont l'extrémité légèrement conique 4a est passée à travers l'orifice également conique dudit ajutage 3. En position totalement repoussée du côté de la tête 2, le pointeau obture l'orifice de l'ajutage 3.The conduit 1c takes the form of a cylindrical tube extending, beyond the end 1d of the body 1, in the diffusion head 2 and comprises at its front part a nozzle 3 screwed into said conduit. Inside thereof is arranged coaxially, a needle 4 constituted by a cylindrical rod whose slightly conical end 4a is passed through the also conical orifice of said nozzle 3. In the fully pushed back position on the side of the head 2 , the needle closes the opening of nozzle 3.

La peinture est admise dans le conduit 1c par un piquage le raccordé à une réserve, au moyen d'une tuyauterie souple, tel que cela sera décrit plus loin.The paint is admitted into the conduit 1c by a nozzle connected to a reserve, by means of flexible tubing, as will be described later.

Le pointeau 4 comporte à sa partie opposée à son extrémité conique 4a, un piston 5 qui se déplace dans un cylindre 6 lequel comporte à sa périphérie une partie filetée 6a.The needle 4 has at its part opposite its conical end 4a, a piston 5 which moves in a cylinder 6 which has at its periphery a threaded part 6a.

Ledit cylindre 6 est vissé à l'intérieur d'un logement cylindrique 1f du corps 1. Il comporte un premier retreint 6b qui pénètre dans un premier prolongement cylindrique 1f₁ du logement 1f et un deuxième retreint 6c qui pénètre dans un deuxième prolongement cylindrique de plus petite section 1f₂.Said cylinder 6 is screwed inside a cylindrical housing 1f of the body 1. It comprises a first constriction 6b which enters a first cylindrical extension 1f₁ of the housing 1f and a second constriction 6c which penetrates into a second additional cylindrical extension small section 1f₂.

Le fond 1c₁ du conduit 1c est percé pour laisser le passage au pointeau 4, lequel s'étend à travers un conduit cylindrique 6d coaxial auxdits retreints 6b et 6c et qui débouche dans un logement cylindrique 6e. L'étanchéité est réalisée au moyen de garnitures, par exemple en cuir, dont une 7 est placée dans le fond du retreint cylindrique 1f₂ en étant insérée entre celui-ci et le prolongement cylindrique 6c, pour constituer un presse étoupe et l'autre 8 est disposée dans le fond du logement 6e.The bottom 1c₁ of the conduit 1c is drilled to allow passage to the needle 4, which extends through a cylindrical conduit 6d coaxial with said constrictions 6b and 6c and which opens into a cylindrical housing 6e. The sealing is carried out by means of linings, for example of leather, one of which 7 is placed in the bottom of the cylindrical constriction 1f₂ by being inserted between the latter and the extension cylindrical 6c, to form a cable gland and the other 8 is arranged in the bottom of the housing 6e.

Un joint torique 9 assure l'étanchéité entre le retreint 6b et le prolongement cylindrique 1f₁, un second joint torique 10, entre le cylindre 6 et le logment cylindrique 1f. L'étanchéité entre l'alésage du cylindre 6 et le piston 5 est également réalisée au moyen d'un joint torique 11.An O-ring 9 seals between the constriction 6b and the cylindrical extension 1f₁, a second O-ring 10 between the cylinder 6 and the cylindrical housing 1f. The seal between the bore of the cylinder 6 and the piston 5 is also achieved by means of an O-ring 11.

Le cylindre 6 s'étend à l'extérieur du corps 1 et comporte une partie hexagonale 6f pour permettre sa mise en place et le serrage au moyen d'une clef. Dans l'alésage du cylindre 6, dans lequel se déplace le piston 5 est placé un ressort antagoniste 12, en appui sur ledit piston et sur un chapeau 13 vissé à l'extrémité externe du cylindre 6.The cylinder 6 extends outside the body 1 and has a hexagonal part 6f to allow it to be put in place and tightened by means of a key. In the bore of the cylinder 6, in which the piston 5 moves, an opposing spring 12 is placed, bearing on said piston and on a cap 13 screwed to the external end of the cylinder 6.

Ledit chapeau comporte un orifice central fileté 13a. Coaxialement et à l'intérieur du ressort 12, est placé un second ressort 15 en appui sur le fond du chapeau 13 et sur une coupelle 16 fixée à l'extrémité du pointeau 4 et sur laquelle le piston 5 est en appui.Said cap has a threaded central opening 13a. Coaxially and inside the spring 12, is placed a second spring 15 bearing on the bottom of the cap 13 and on a cup 16 fixed to the end of the needle 4 and on which the piston 5 is supported.

Sur le chapeau 13 est vissé en son centre dans son orifice 13a une vis butée 17 à tête moletée coaxiale au pointeau 4 qui permet d'ajuster la course dudit pointeau. Cette vis comporte une bague moletée 14 qui remplit la fonction d'un contre-écrou, pour immobiliser la vis 17 en position.On the cap 13 is screwed in its center in its orifice 13a a stop screw 17 with knurled head coaxial with the needle 4 which allows to adjust the stroke of said needle. This screw comprises a knurled ring 14 which fulfills the function of a lock nut, to immobilize the screw 17 in position.

L'air comprimé à haute pression est admis dans le cylindre 6 par des conduits 6g qui mettent en communication ledit cylindre et une chambre annulaire 1g dans laquelle aboutit un piquage 1h, raccordé à un groupe moto-compresseur d'air, par une tubulure souple. La fixation de cette tubulure audit piquage 1h est réalisée à la façon d'un raccord à trois pièces 18.The high pressure compressed air is admitted into the cylinder 6 by conduits 6g which put said cylinder in communication with an annular chamber 1g in which a 1h tapping ends, connected to a motor-air compressor group, by a flexible tube. . The attachment of this tubing to said 1 hour stitching is carried out in the manner of a three-piece connection 18.

Lorsque la chambre annulaire 1g est hors pression, et sous l'effet combiné des ressorts 12 et 15, le piston 5 est en appui dans le fond du cylindre 6, le pointeau 4 obture totalement l'ajutage 3.When the annular chamber 1g is depressurized, and under the combined effect of the springs 12 and 15, the piston 5 is in abutment in the bottom of the cylinder 6, the needle 4 completely closes the nozzle 3.

Lorsque la chambre 1g est sous pression, l'air comprimé repousse le piston 5 qui, en appui sur la coupelle 16, entraîne le pointeau 4, lequel se déplace par rapport à l'ajutage 3, ce qui crée entre l'extrémité conique 4a du pointeau et l'orifice de l'ajutage 3, un espace annulaire par lequel passe la peinture. Cet espace grandit au fur et à mesure que le pointeau se déplace du côté de la vis 17.When the chamber 1g is under pressure, the compressed air pushes back the piston 5 which, pressing on the cup 16, drives the needle 4, which moves relative to the nozzle 3, which creates between the conical end 4a of the needle and the orifice of the nozzle 3, an annular space through which the paint passes. This space increases as the needle moves to the side of the screw 17.

Le réglage du fonctionnement du pointeau 4 est réalisé en agissant sur la vis-butée 17 pour régler la course de celui-ci.The operation of the needle 4 is adjusted by acting on the stop screw 17 to adjust the stroke of the latter.

Le réglage est maintenu en bloquant la vis 17 au moyen de la bague 14.The adjustment is maintained by blocking the screw 17 by means of the ring 14.

L'air à basse pression est admis dans la chambre 1a par un piquage 1j raccordé à un turbo-compresseur, par une tubulure souple dont il sera question plus loin.The low pressure air is admitted into the chamber 1a by a nozzle 1j connected to a turbo-compressor, by a flexible tube which will be discussed later.

L'extrémité 1d du corps 1 est filetée à sa périphérie externe sur laquelle est vissée la tête de diffusion 2. Celle-ci (figures 3 et 4) se compose d'une partie cylindrique creuse 2a, filetée à sa périphérie interne 2a₁ et qui entoure l'extrémité 1d du corps 1, et d'une partie tronconique 2b qui diverge de l'arrière, à partir de la partie 2a, vers l'avant, laquelle partie 2b et chanfreinée en 2b₁.The end 1d of the body 1 is threaded at its external periphery onto which the diffusion head 2 is screwed. The latter (FIGS. 3 and 4) consists of a hollow cylindrical part 2a, threaded at its internal periphery 2a₁ and which surrounds the end 1d of the body 1, and of a frustoconical part 2b which diverges from the rear, from the part 2a, towards the front, which part 2b and chamfered in 2b₁.

Ladite tête 2 comporte coaxialement aux parties 2a, 2b une première cavité cylindrique 2c, dont le fond 2c₁ est tronconique et comporte un orifice coaxial 2d, et une seconde cavité tronconique 2e ouverte à l'avant de la tête et dont la paroi 2e₁ diverge de l'arrière vers l'avant.Said head 2 comprises coaxially with the parts 2a, 2b a first cylindrical cavity 2c, the bottom 2c₁ of which is frustoconical and has a coaxial orifice 2d, and a second frustoconical cavity 2e open at the front of the head and whose wall 2e₁ diverges from back to front.

L'orifice 2d est commun aux cavités 2c, 2e et la cavité 2c débouche à l'arrière dans la partie évidée cylindrique 2a.The orifice 2d is common to the cavities 2c, 2e and the cavity 2c opens at the rear in the cylindrical recessed part 2a.

En position montée de la tête 2 sur le corps 1, 1a cavité 2c débouche dans ladite chambre annulaire la du corps 1.In the mounted position of the head 2 on the body 1, the cavity 2c opens into said annular chamber 1a of the body 1.

Dans cette position, l'extrémité conique de l'ajutage 3 est sensiblement parallèle au fond 2c₁ de la cavité cylindrique 2c et éloignée de celui-ci pour ménager un espace annulaire 1g.In this position, the conical end of the nozzle 3 is substantially parallel to the bottom 2c₁ of the cylindrical cavity 2c and distant from the latter to provide an annular space 1g.

L'air à basse pression en provenance de la chambre 1a passe par la cavité 2c et l'espace annulaire 1g en entraînant la peinture issue du conduit 1c, à travers l'orifice 2d, pour la diffuser et la pulvériser à partir de la cavité conique 2e. L'admission de la peinture dans la tête de diffusion est obtenue par déplacement vers l'arrière du pointeau 4 tel que celà a été décrit plus haut et dont l'extrémité 4a traverse l'orifice 2d. Le bord périphérique 2d₁ dudit orifice est évasé du côté de la cavité tronconique 2e.The low pressure air from the chamber 1a passes through the cavity 2c and the annular space 1g by entraining the paint from the conduit 1c, through the orifice 2d, to diffuse and spray it from the cavity conical 2nd. The admission of paint into the diffusion head is obtained by moving the needle 4 towards the rear as described above and the end 4a of which passes through the orifice 2d. The peripheral edge 2d₁ of said orifice is flared on the side of the frustoconical cavity 2e.

Celle-ci comporte en outre, quatre conduits diffuseurs d'air cylindriques 2f dont les orifices de sortie 2f₁ à 2f₄ sont situés dans la cavité tronconique 2e. Lesdits orifices sont disposés à 90° l'un de l'autre et sont diamétralement opposés deux à deux et équidistants de l'axe longitudinal Z, Z₁ de la tête. Ainsi les orifices 2f₁, 2f₃ sont situés sur l'axe X, X₁, les orifices 2f₂, 2f₄ sur l'axe Y, Y₁, lesdits axes X, X₁ / Y, Y₁ étant perpendiculaires.It further comprises four cylindrical air diffusing conduits 2f whose outlet orifices 2f₁ to 2f₄ are located in the frustoconical cavity 2e. Said orifices are arranged at 90 ° from one another and are diametrically opposite two by two and equidistant from the longitudinal axis Z, Z₁ of the head. Thus the orifices 2f₁, 2f₃ are located on the axis X, X₁, the orifices 2f₂, 2f₄ on the axis Y, Y₁, said axes X, X₁ / Y, Y₁ being perpendicular.

Les conduits 2f convergent sur un point 0 situé sur l'axe longitudinal Z, Z₁ de la tête 2 et sont équidistants de cet axe. Leur inclinaison par rapport à l'axe Z, Z₁ est par exemple comprise entre 50° à 62°. Dans un mode de réalisation, les axes des conduits forment un angle α de 60° avec l'axe Z, Z₁.The conduits 2f converge on a point 0 located on the longitudinal axis Z, Z₁ of the head 2 and are equidistant from this axis. Their inclination relative to the axis Z, Z₁ is for example between 50 ° to 62 °. In one embodiment, the axes of the conduits form an angle α of 60 ° with the axis Z, Z₁.

Lesdits conduits débouchent dans des trous taraudés à fond conique 2g, coaxiaux auxdits conduits et dans lesquels trous taraudés sont vissés des raccords de tubes souples, reliés au turbo-compresseur qui fourni l'air à basse pression.Said conduits open into tapped holes with a conical bottom 2g, coaxial with said conduits and into which tapped holes are screwed flexible tube fittings, connected to the turbo-compressor which supplies the air at low pressure.

Un dispositif diffuseur de peinture à télécommande est représenté à la figure 1.A remote control paint diffuser device is shown in Figure 1.

Le corps 1 est fixé à un bras de robot ou à un "réciprocator" (non représentés) au moyen d'une vis passée dans un trou 20 s'étendant transversalement au corps 1. Ainsi montés le corps 1 et la tête de diffusion 2 peuvent être mis en position à l'inclinaison voulue en fonction des travaux à réaliser. Ledit corps peut également être calé sur un axe monté rotatif à l'extrémité du bras du robot, par exemple pour orienter le corps et la tête de diffusion au cours de l'opération de peinture.The body 1 is fixed to a robot arm or to a "reciprocator" (not shown) by means of a screw passed through a hole 20 extending transversely to the body 1. Thus mounted the body 1 and the diffusion head 2 can be positioned at the desired angle depending on the work to be done. Said body can also be wedged on an axis rotatably mounted at the end of the robot arm, for example to orient the body and the diffusion head during the painting operation.

Ledit corps 1 est relié par une tubulure souple 22, à une réserve de peinture (non représentée), qui alimente le conduit central 1c.Said body 1 is connected by a flexible tube 22, to a paint reserve (not shown), which supplies the central duct 1c.

La tubulure 22 est raccordée au piquage le, au moyen d'un raccord de tube, par exemple dit "raccord trois pièces" 23.The tubing 22 is connected to the nozzle, by means of a tube connector, for example called a "three-piece connector" 23.

Le corps 1 est également relié par une tubulure souple 24, à un distributeur-régulateur 25. Ladite tubulure est raccordée au moyen de raccords rapides 26, 27, au piquage 1j du corps 1 et au régulateur 25₁ du distributeur.The body 1 is also connected by a flexible tube 24, to a distributor-regulator 25. Said tube is connected by means of quick couplings 26, 27, to the nozzle 1j of the body 1 and to the regulator 25₁ of the distributor.

Le distributeur-régulateur 25 (figures 1 et 5 à 8) est par exemple d'une forme générale parallélépipédique et comporte sur son axe longitudinal un canal central 25a, lequel est cylindrique et comporte à une de ses extrémités, un retreint 25b qui débouche dans un alésage cylindrique 25c, qui traverse le distributeur de part en part perpendiculairement à ses grandes faces 25d, 25e, lequel alésage constitue le boisseau d'un robinet à trois voies. Le canal central 25a comporte à l'opposé du retreint 25b, une entrée cylindrique élargie 25f taraudée à sa partie interne, pour recevoir un raccord de tube 28, relié audit turbo-compresseur (non représenté) qui fournit l'air comprimé à basse pression.The distributor-regulator 25 (Figures 1 and 5 to 8) is for example of a generally parallelepiped shape and has on its longitudinal axis a central channel 25a, which is cylindrical and has at one of its ends, a constriction 25b which opens into a cylindrical bore 25c, which passes right through the distributor perpendicular to its large faces 25d, 25e, which bore constitutes the bushel of a three-way valve. The central channel 25a comprises, opposite the constriction 25b, an enlarged cylindrical inlet 25f tapped on its internal part, to receive a tube connector 28, connected to said turbo-compressor (not shown) which supplies compressed air at low pressure. .

Le distributeur 25 comporte en outre un canal latéral 25g qui aboutit dans ledit canal central 25a, lequel canal latéral comporte une entrée élargie taraudée 25h et dans laquelle est vissée ledit régulateur d'air 25₁, qui permet de régler le débit de l'air à basse pression admis dans la chambre annulaire la du corps 1.The distributor 25 further comprises a lateral channel 25g which terminates in said central channel 25a, which lateral channel has an enlarged threaded inlet 25h and in which said air regulator 25₁ is screwed, which makes it possible to regulate the air flow at low pressure admitted into the annular chamber la of the body 1.

La face 25d comporte, au droit du canal central 25a, un trou taraudé 25j dans lequel est vissé un manomètre 29 qui indique la pression de l'air admis dans le distributeur.The face 25d comprises, to the right of the central channel 25a, a tapped hole 25j into which is screwed a pressure gauge 29 which indicates the pressure of the air admitted into the distributor.

Le distributeur 25 comporte encore deux conduits latéraux 25k, 25₁ coaxiaux et diamétraux, perpendiculaires à l'axe du canal central 25a, lesquels conduits 25k, 251 débouchent dans ledit boisseau 25c.The distributor 25 also comprises two lateral conduits 25k, 25₁ coaxial and diametrical, perpendicular to the axis of the central channel 25a, which conduits 25k, 251 open into said plug 25c.

Lesdits conduits s'étendent du boisseau 25c aux faces latérales 25m, 25n du distributeur et sont taraudés au niveau desdites faces en 25p, 25q pour recevoir chacun un raccord à deux sorties 30, 31 vissés dans la partie taraudée des conduits.Said conduits extend from the plug 25c to the lateral faces 25m, 25n of the distributor and are tapped at the level of said faces at 25p, 25q to each receive a connector with two outlets 30, 31 screwed into the tapped part of the conduits.

Chacun des raccords 30, 31 est relié par des tubulures souples 33, 34 - 35, 36 auxdits ensembles de deux conduits diffuseurs d'air, au moyen de raccords rapides 37 vissés dans les trous taraudés 2g de la tête de diffusion 2.Each of the connections 30, 31 is connected by flexible tubes 33, 34 - 35, 36 to said sets of two air diffusing conduits, by means of quick connectors 37 screwed into the tapped holes 2g of the diffusion head 2.

Dans le boisseau 25c est monté tournante, une clef cylindrique 38 comportant de façon connue un conduit de communication coudé à 90°, 38a de même diamètre que celui du retreint 25b et des conduits latéraux 25k, 251.In the plug 25c is rotatably mounted, a cylindrical key 38 comprising in known manner a communication conduit bent at 90 °, 38a of the same diameter as that of the constriction 25b and the lateral conduits 25k, 251.

Les axes des conduits 38a, 25k, 251 et du retreint 25b sont situés dans un même plan. La clef 38 comporte à sa partie inférieure un rebord 38b formant un épaulement périphérique venant en appui sur la face 25e du distributeur et à sa partie supérieure un axe coaxial 38c. Sur l'axe 38c est fixée, par exemple au moyen d'une goupille mécanique 39, une poignée de commande 40. De part et d'autre du conduit coudé 38a, la clef comporte deux gorges périphériques 38d, 38e perpendiculaires à l'axe de révolution de la clef 38. dans lesquelles gorges sont placés deux joints toriques 41, 42 qui réalisent l'étanchéité entre le boisseau 25c et la clef 38. En manoeuvrant la poignée 40, soit on établit la communication entre le canal central 25a et l'un ou l'autre des conduits latéraux 25k, 251, qui dirigent l'air à basse pression dans l'un ou l'autre ensemble de deux conduits diffuseurs 2f₁, 2f₃ - 2f₂, 2f₄ pour obtenir des jets de peinture plats alternativement à 90° l'un de l'autre, soit on interromp la circulation de l'air dans les réseaux desdits conduits diffuseurs, pour obtenir des jets ronds, en mettant la poignée 40 dans une position intermédiaire ne réalisant aucune communication entre le canal central 25a et lesdits conduits latéraux 25k, 251.The axes of the conduits 38a, 25k, 251 and the constriction 25b are located in the same plane. The key 38 has at its lower part a rim 38b forming a peripheral shoulder coming to bear on the face 25e of the dispenser and at its upper part a coaxial axis 38c. On the axis 38c is fixed, for example by means of a mechanical pin 39, a control handle 40. On either side of the bent conduit 38a, the key comprises two peripheral grooves 38d, 38e perpendicular to the axis of revolution of the key 38. in which grooves are placed two O-rings 41, 42 which realize the seal between the plug 25c and the key 38. By operating the handle 40, either communication is established between the central channel 25a and one or the other of the lateral conduits 25k, 251, which direct the air at low pressure in one or the other set of two diffusing conduits 2f₁, 2f₃ - 2f₂, 2f₄ to obtain flat paint jets alternately at 90 ° from each other, or the air circulation is interrupted in the networks of said diffusing conduits, to obtain round jets, by putting the handle 40 in an intermediate position making no communication between the central channel 25a and said lateral conduits 25k, 251.

La face 25d du distributeur comporte en outre et au droit de chacun des conduits latéraux 25k, 251, un trou taraudé 25r, 25s à pas micrométrique et dans lesquels sont vissées des vis micrométriques 43, 44. Ces vis ont pour fonction de modifier la section des conduits 25k, 251 afin de régler le débit d'air à basse pression envoyé dans les couples de conduits diffuseurs 2f₁, 2f₃ - 2f₂, 2f₄ de la tête 2 à travers les tubulures d'alimentation de ladite tête 33, 34, 35, 36 dans le but de permettre le réglage de la largeur des jets plats.The face 25d of the dispenser further comprises and in line with each of the lateral conduits 25k, 251, a tapped hole 25r, 25s with micrometric pitch and into which micrometric screws 43, 44 are screwed. The function of these screws is to modify the section conduits 25k, 251 in order to regulate the air flow at low pressure sent into the pairs of diffusing conduits 2f₁, 2f₃ - 2f₂, 2f₄ from head 2 through the supply pipes of said head 33, 34, 35, 36 in order to allow the width of the flat jets to be adjusted.

Le régulateur 25₁ permet également d'adapter le débit de l'air véhicule à basse pression et d'atomisation de la peinture, via la tubulure 24 et le corps 1 du dispositif et corrélativement le débit de la peinture, en fonction des travaux à réaliser.The regulator 25₁ also makes it possible to adapt the flow rate of the vehicle air at low pressure and of atomization of the paint, via the tube 24 and the body 1 of the device and correlatively the flow rate of the paint, according to the work to be carried out .

Claims (10)

1. Dispositif diffuseur de peinture comprenant un corps (1), comportant une alimentation en peinture (1e) et au moins une alimentation en air comprimé (1j, 1h) et à son extrémité avant une tête de diffusion (2) pour pulvériser la peinture sous la forme de jets ronds ou aplatis caractérisé en ce que ladite tête de diffusion (2) est montée fixe sur ledit corps (1) et comporte quatre conduits diffuseurs d'air 2f dont les orifices de sortie (2f₁ à 2f₄) sont disposés à 90° l'un de l'autre, dont les axes desdits conduits convergent sur un point 0 situé sur l'axe longitudinal (Z, Z₁) de la tête, en avant de celle-ci et sont reliés à des moyens distributeurs régulateurs d'air (25, 25₁) actionnés par une commande (40) pour diriger l'air dans l'un ou l'autre ensemble de deux conduits diamétralement opposés (2f₁, 2f₃ - 2f₂, 2f₄) et obtenir des jets aplatis d'orientation généralement verticale ou horizontale, ou pour stopper l'arrivée d'air dans lesdits conduits et obtenir des jets ronds.1. Paint diffuser device comprising a body (1), comprising a paint supply (1e) and at least one compressed air supply (1d, 1h) and at its front end a diffusion head (2) for spraying the paint in the form of round or flattened jets characterized in that said diffusion head (2) is fixedly mounted on said body (1) and comprises four air diffusing ducts 2f whose outlet orifices (2f₁ to 2f₄) are arranged at 90 ° from each other, whose axes of said conduits converge on a point 0 located on the longitudinal axis (Z, Z₁) of the head, in front of it and are connected to regulating distributor means d '' (25, 25₁) actuated by a control (40) to direct the air in one or the other set of two diametrically opposed conduits (2f₁, 2f₃ - 2f₂, 2f₄) and obtain flat jets of orientation generally vertical or horizontal, or to stop the flow of air into said con picks and get round jets. 2. Dispositif selon la revendication 1 dont la peinture est amenée par un conduit (1c) comportant un ajutage (3) et dont le débit est régulé par un pointeau (4) et dont l'air de diffusion est amené jusqu'à la tête (2) par une chambre annulaire (1a) extérieure et coaxiale audit conduit (1c), caractérisé en ce que la tête de diffusion (2) comporte une première cavité cylindrique (2c) coaxiale à ladite tête et débouchant dans ladite chambre annulaire (la) et dont le fond (2c₁) de ladite cavité est tronconique et comporte un orifice circulaire (2d) coaxial à ladite cavité (2c), et une seconde cavité tronconique (2e) coaxiale à ladite tête et ouverte à l'avant de celle-­ci et dont la paroi (2e₁) diverge de l'arrière vers l'avant et où débouchent lesdits conduits diffuseurs d'air (2f) lequel orifice circulaire (2d) est commun auxdites cavités (2c, 2e).2. Device according to claim 1, the paint of which is supplied by a conduit (1c) comprising a nozzle (3) and the flow rate of which is regulated by a needle (4) and the diffusion air of which is brought to the head (2) by an annular chamber (1a) external and coaxial with said conduit (1c), characterized in that the diffusion head (2) comprises a first cylindrical cavity (2c) coaxial with said head and opening into said annular chamber (la ) and the bottom (2c₁) of said cavity is frustoconical and comprises a circular orifice (2d) coaxial with said cavity (2c), and a second frustoconical cavity (2e) coaxial with said head and open at the front thereof ci and whose wall (2e₁) diverges from the rear towards the front and where said air diffusers open (2f) which circular orifice (2d) is common to said cavities (2c, 2e). 3. Dispositif selon l'une quelconque des revendications 1 et 2 dont ledit ajutage (3) comporte une extrémité conique dont les génératrices convergent sur l'axe longitudinal de la tête et dans lequel ajutage (3) est disposé le pointeau (4), caractérisé en ce que ladite extrémité conique est sensiblement parallèle au fond tronconique (2c₁) de ladite première cavité (2c) et est éloignée de celui-ci pour ménager un espace annulaire (19) pour le passage de l'air de pulvérisation de la peinture autour du pointeau (4) et à travers ledit orifice circulaire (2d).3. Device according to any one of claims 1 and 2 in which said nozzle (3) has a conical end whose generatrices converge on the longitudinal axis of the head and in which nozzle (3) is arranged the needle (4), characterized in that said conical end is substantially parallel to the frustoconical bottom (2c₁) of said first cavity (2c) and is spaced therefrom to provide an annular space (19) for the passage of the air for spraying the paint around the needle (4) and through said circular orifice (2d). 4. Dispositif selon l'une quelconque des revendications 1 et 3 caractérisé en ce que l'extrémité (4a) du pointeau (4) pénètre dans ledit orifice circulaire (2d) dont le bord (2d₁) est évasé du côté de ladite seconde cavité tronconique (2e).4. Device according to any one of claims 1 and 3 characterized in that the end (4a) of the needle (4) penetrates into said circular orifice (2d) whose edge (2d₁) is flared on the side of said second cavity frustoconical (2e). 5. Dispositif selon l'une quelconque des revendications 1 et 4 caractérisé en ce que chaque conduit diffuseur d'air (2f) débouche dans le fond conique d'un trou cylindrique taraudé (2g) pour recevoir un raccord de tube 37.5. Device according to any one of claims 1 and 4 characterized in that each air diffuser duct (2f) opens into the conical bottom of a tapped cylindrical hole (2g) to receive a tube connection 37. 6. Dispositif selon la revendication 5 caractérisé en ce que lesdits conduits (2f) et lesdits trous taraudés (2g) sont coaxiaux et inclinés suivant un angle α compris entre 50° et 62° de préférence 60° par rapport à l'axe longitudinal (Z, Z₁) de la tête de diffusion (2) et leurs orifices de sortie (2f₁ à 2f₄) sont équidistants de l'axe longitudinal (Z, Z₁) de la tête.6. Device according to claim 5 characterized in that said conduits (2f) and said threaded holes (2g) are coaxial and inclined at an angle α between 50 ° and 62 ° preferably 60 ° relative to the longitudinal axis ( Z, Z₁) of the diffusion head (2) and their outlet orifices (2f₁ to 2f₄) are equidistant from the longitudinal axis (Z, Z₁) of the head. 7. Dispositif selon l'une quelconque des revendications 1 à 6 dont ledit corps comporte une arrivée d'air comprimé (1h) relié à un groupe moto-compresseur d'air à haute pression pour actionner ledit pointeau (4), caractérisé en ce qu'il est commandé à distance par un distributeur- régulateur d'air (25) relié audit corps (1) par une tubulure souple (24) pour alimenter ladite chambre annulaire (1a) en air véhicule et de pulvérisation de la peinture et que la tête de diffusion (2) est reliée audit distributeur-régulateur (25) par quatre tubulures souples (33 à 36) fixées auxdits raccords de tubes (37) pour alimenter deux à deux (33, 34, 35, 36) lesdits conduits diffuseurs d'air comprimé diamétralement opposés deux à deux (2f₁, 2f₃ - 2f₂, 2f₄) lequel distributeur-régulateur (25) est lui-même relié à un turbo-compresseur d'air à basse pression ou audit groupe moto-­compresseur d'air à haute pression et comporte en outre des moyens pour stopper l'alimentation en air desdits conduits diffuseurs (2f).7. Device according to any one of claims 1 to 6, said body of which comprises a compressed air inlet (1h) connected to a motor-compressor group of high pressure air for actuating said needle (4), characterized in that that it is remotely controlled by an air regulator-distributor (25) connected to said body (1) by a flexible tube (24) for supplying said annular chamber (1a) with vehicle air and spraying paint and that the diffusion head (2) is connected to said distributor-regulator (25) by four flexible tubes (33 to 36) fixed to said tube connections (37) to supply two by two (33, 34, 35, 36) said diffusing conduits of compressed air diametrically opposite two by two (2f₁, 2f₃ - 2f₂, 2f₄) which distributor-regulator (25) is itself connected to a low-pressure air turbo-compressor or to said motor-air compressor group at high pressure and further comprises means for stopping the feed air intake of said diffusing conduits (2f). 8. Dispositif selon la revendication 7 caractérisé en ce que le distributeur-régulateur d'air (25) comporte un canal central (25a) aboutissant à un boisseau (25c) d'un robinet à trois voies dans lequel est monté tournante une clef (38) comportant des moyens de commande (40) et dans lequel boisseau (25c) débouche deux conduits latéraux diamétralement opposés (25k, 251) et s'étendant à 90° dudit canal central (25a) lequel est relié par son extrémité (25f), opposée audit boisseau (25c), audit turbo-compresseur ou audit groupe moto-­compresseur, lequel distributeur (25) comporte en outre un canal latéral (25h) aboutissant dans ledit canal central (25a). lequel canal latéral (25h) est relié à travers des moyens régulateurs d'air (25₁) à ladite chambre annulaire (1a) dudit corps (1), pour amener l'air de pulvérisation dans la tête de diffusion (2) et que chacun desdits conduits latéraux (25k, 251) est relié par un raccord à deux sorties (30, 31) à un desdits ensembles de deux conduits diffuseurs d'air (2f₁, 2f₃ - 2f₂, 2f₄) de la tête de diffusion (2).8. Device according to claim 7 characterized in that the air distributor-regulator (25) comprises a central channel (25a) leading to a plug (25c) of a three-way valve in which is mounted a key ( 38) comprising control means (40) and in which plug (25c) opens two lateral diametrically opposite conduits (25k, 251) and extending at 90 ° to said channel central (25a) which is connected by its end (25f), opposite to said plug (25c), to said turbo-compressor or to said motor-compressor group, which distributor (25) further comprises a lateral channel (25h) terminating in said channel central (25a). which lateral channel (25h) is connected through air regulating means (25₁) to said annular chamber (1a) of said body (1), to bring the spraying air into the diffusion head (2) and that each of said lateral conduits (25k, 251) is connected by a connector with two outlets (30, 31) to one of said sets of two air diffusing conduits (2f₁, 2f₃ - 2f₂, 2f₄) of the diffusion head (2). 9. Dispositif selon l'une quelconque des revendications 7 et 8 caractérisé en ce que le distributeur-régulateur d'air (25) comporte au droit de chacun desdits conduits latéraux, (25k, 251) une vis micrométrique (43, 44) pour modifier la section de passage de l'air dans lesdits conduits.9. Device according to any one of claims 7 and 8 characterized in that the air distributor-regulator (25) comprises, to the right of each of said lateral conduits, (25k, 251) a micrometric screw (43, 44) for modify the air passage section in said conduits. 10. Dispositif selon l'une quelconque des revendications 7 à 9 dont le boisseau (25c) est cylindrique et à fond ouvert, caractérisé en ce que ladite clef (38) comporte un épaulement (38b) situé en regard du bord dudit fond, et à l'opposé dudit épaulement, un axe (38c) coaxial à la clef, auquel axe sont fixés lesdits moyens de commande (40), lesquels maintiennent en position la clef (38) dans le boisseau (25c), en combinaison avec ledit épaulement (38b) et en ce que la clef (38) comporte en outre, au moins deux gorges périphériques (38d, 38e) perpendiculaire à l'axe de révolution de la clef, situées de part et d'autre desdits conduits latéraux (25k, 251) et dudit canal central (25a, 25b) et dans lesquelles gorges (38d, 38e) sont disposés des joints (41, 42) pour réaliser l'étanchéité à l'air dans le boisseau (25c).10. Device according to any one of claims 7 to 9, the plug (25c) of which is cylindrical and with an open bottom, characterized in that said key (38) has a shoulder (38b) situated opposite the edge of said bottom, and opposite said shoulder, an axis (38c) coaxial with the key, to which axis are fixed said control means (40), which hold the key (38) in position in the plug (25c), in combination with said shoulder (38b) and in that the key (38) further comprises at least two peripheral grooves (38d, 38e) perpendicular to the axis of revolution of the key, located on either side of said lateral conduits (25k, 251) and said central channel (25a, 25b) and in which grooves (38d, 38e) are arranged seals (41, 42) to achieve airtightness in the plug (25c).
EP90430014A 1989-06-21 1990-06-12 Paint diffusing device Withdrawn EP0404702A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8908576 1989-06-21
FR8908576A FR2648731B1 (en) 1989-06-21 1989-06-21 PAINT DIFFUSER DEVICE

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EP0404702A1 true EP0404702A1 (en) 1990-12-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251821A (en) * 1991-11-13 1993-10-12 Can-Am Engineered Products, Inc. Paint spray gun
WO2001028694A1 (en) * 1999-10-21 2001-04-26 David George Gill Spray head

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE840818C (en) * 1950-11-07 1952-06-05 Albach & Co Armaturen Und Sire Paint spray gun, especially for low pressure air

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE840818C (en) * 1950-11-07 1952-06-05 Albach & Co Armaturen Und Sire Paint spray gun, especially for low pressure air

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251821A (en) * 1991-11-13 1993-10-12 Can-Am Engineered Products, Inc. Paint spray gun
WO2001028694A1 (en) * 1999-10-21 2001-04-26 David George Gill Spray head

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Publication number Publication date
FR2648731A1 (en) 1990-12-28
FR2648731B1 (en) 1991-10-18

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