EP1389651B1 - Dispenser for particulate material like glass beads - Google Patents

Dispenser for particulate material like glass beads Download PDF

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Publication number
EP1389651B1
EP1389651B1 EP20030366005 EP03366005A EP1389651B1 EP 1389651 B1 EP1389651 B1 EP 1389651B1 EP 20030366005 EP20030366005 EP 20030366005 EP 03366005 A EP03366005 A EP 03366005A EP 1389651 B1 EP1389651 B1 EP 1389651B1
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EP
European Patent Office
Prior art keywords
main
slide
chamber
opening
inner slide
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EP20030366005
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German (de)
French (fr)
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EP1389651A1 (en
Inventor
Bernard Camus
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Jetline SAS
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Jetline SAS
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/16—Devices for marking-out, applying, or forming traffic or like markings on finished paving; Protecting fresh markings
    • E01C23/166—Means for dispensing particulate material on to freshly applied markings or into the marking material after discharge thereof, e.g. reflective beads, grip-improving particles

Definitions

  • the present invention relates to a device to automatically spray products powders for example glass microbeads to time of the marking of the signaling strips on the roads and similar surfaces.
  • microbeads of glass when applying a material intended for carry out the horizontal signaling on the roads.
  • the microbeads have a non-slip function and light reflection.
  • a product powder other than glass microbeads is used, such as crushed minerals, for example silica.
  • a machine moving on the road allows to drop paint on the floor and immediately after painting, the microbeads to adhere to painting.
  • US 3,967,784 and US 5,169,262 describe such devices in which the needle is intended to slide in a body between a position closure and an open position.
  • the product powder is brought into a distribution chamber surrounding the needle.
  • the needle When the needle is in position the product escapes through a conduit of output located in the axis of the needle.
  • the needle is brought by a piston in the closed position, in which it comes to bear on a seat separating a end of the outlet duct and the body chamber to form a dam.
  • Some machines also have filling systems, glass microbeads, using an air depression caused in the tank. It follows therefore air aspirations to Dam level sometimes leading to impossibilities to make an acceptable vacuum in the tank for ensure fast filling.
  • fluidization is carried out at the time of the passage of the microbeads of glass in the calibrated passage section allowing to improve the flow of glass microbeads in this place.
  • This fluidization is carried out by fluidization air injection, which forces the mounting these guns only on machines equipped with an external source of fluidization air.
  • the aim of the invention is to provide a device for spray with a good seal closing.
  • the closing of the flow of powdery product is obtained by creating two dams successive stages, which makes it possible to obtain a more safe.
  • the first dam is made by the support of main slide against the first seat, and the second dam is obtained by the contact of the slider inside on the second seat.
  • Another object of the invention is to ensure a better airtightness between the outlet duct and the distribution chamber.
  • inner slide advantageously comprises means flexible sealing elements intended to bear against the second seat. This type of contact of a flexible material, such as an elastomer, on the seat makes it perfectly to ensure airtightness.
  • the first and the second means Maneuvering are provided for the opening position be ordered at the same time as the retracted position, and that the main slide goes into position closing before the inner slider goes into advanced position. Thanks to this time lag at the closure, the first dam is in place before the second, and so, the powdery product located downstream of this dam can continue to flow. So when the inner slide comes into contact with the second seat, said seat is more surely free of product powder, and sealing is better guaranteed.
  • a spring is housed in the closing chamber, the spring tending to move the main slide to the closed position.
  • the shifting of the inner slide and slider principal is further accentuated by the fact that the spring helps the movement of the main slide towards the position of closing.
  • the main slide is retained by the spring while the back chamber is put under pressure.
  • the inner slider then moves towards the recoil position.
  • the sealing end is then less exposed to microbeads when the slider release the dam at the level of the first seat.
  • the spring ensures that the slide principal is in the closed position when no air pressure does not supply the rooms of opening and closing.
  • the device has an adjustable stop system for position a stop defining either the position opening of the main slide, ie the position of retreat of the inner slider.
  • the device comprises a pin mounted radially in the main slide and protruding into a clearance of the slider inside, the edges of the clearance forming stops to limit the stroke of the inner slider by compared to the main slide.
  • the body comprises a first wiper seal around the main slide at the outlet in the distribution chamber, and / or the main slide carries a wiper seal around the slider inside the outlet in the room of distribution.
  • the inner slider comprises a longitudinal channel leading to the sealing end to bring spray air into the axis of the outlet duct.
  • air opens into the outlet duct along the main axis and the product powder is driven to the outlet by this flow.
  • the main slider comes into position the remainder of the powder product downstream of the dam at the first seat is also driven, and the second seat is more surely cleared to guarantee that the contact with the sealing end of the inner slider is made without any interposed product.
  • the body comprises a spray air inlet
  • the longitudinal channel opens at the other end of the inner slider
  • the device comprising closure means of which the opening is controlled by the inner slider when said inner slider is in position remote to port the channel longitudinal and the arrival of spray air, the spray air can then be driven to through the longitudinal channel.
  • a device is connected to a source of atomizing air, which he It is possible to provide a flow and pressure. Spray air is injected only when the inner slider is in the recoil position, its distribution being directly controlled by the inner slide. So we have a very good way simple order.
  • the slide interior has a radial orifice communication the longitudinal channel and the chamber of recoil to bring air spray into the channel longitudinal when pressurized air in the chamber reversing controls the retracted position. So, the air of spraying comes from the control air in the back room. It is therefore not necessary to provide specific spray air source.
  • the device further comprises first removable means for closing the radial orifice and second removable means for closing off the air intake the first means, or the second removable means being put in place to choose the source of air spray.
  • the removable means are typically plugs.
  • the same device can be used indifferently on machines with a generator spraying air or being deprived. Indeed, depending on the machine, just set up one of the plugs and remove each other to convert the device.
  • the air of spray comes from a specific source, while in the other case, the spray air comes from a transfer of control air from the back room.
  • a first mode of embodiment of the device according to the invention comprises a body 21 extending along a main axis A, extended by a head 22.
  • the head 22 fixed in a manner removable on the body 21 by screws 20, has a distribution chamber 18 in communication with a inlet duct 30 substantially perpendicular to the axis A.
  • the distribution chamber 18 communicates also with an outlet duct 31 which is substantially coaxial with the main axis A.
  • the duct input 30 is intended to feed the chamber 18 with a powdery product such as glass microbeads.
  • the outlet duct 31 is provided to evacuate the product powder.
  • a deflector 32 is fixed on the conduit of outlet 31 to direct the powdery product into a desired direction.
  • a base 33 mounted on the body according to the main axis A forms the connection between the chamber of distribution 18 and the outlet duct 31.
  • the conduit outlet 31 is mounted on the head 22 removably and it also encloses an interchangeable nozzle 19 against the base 33.
  • the interchangeable nozzle 19 makes it possible to adapt the flow of microbeads by changing its section of passage.
  • a main slide 1 is slidably mounted in the body 21 along the main axis A.
  • the slide main 1 comprises a main piston 36 integrated, and slidably mounted in a main cylinder 37.
  • the piston main 36 shape with the main cylinder 37 a cylinder.
  • the main piston 36 divides the cylinder main 37 in an opening chamber 38 located on the side of the head 22, and a closing chamber 39 located the other side of the main piston 36.
  • a wiper 35 is carried by the body 21 at the outlet of the main piston 1 in the distribution chamber 18 and surrounds the main slide 1.
  • a spring 27 is housed in the closing chamber 39 and is supported on the one hand by a bearing 46 fixed on the body and on the other hand on the piston principal 36, so that it tends to bring the main slide 1 in the direction of the conduit exit 31.
  • An inner slide 4 is slidably mounted along the main axis A in the main slide 1.
  • An inner piston 40 is also integrated into the inner slide and forms a cylinder with a cylinder 41 arranged coaxially inside the slider main 1.
  • the piston 40 delimits a recoil chamber 42 in the cylinder 41, the recoil chamber 42 being located on the side of the head 22.
  • On the other side of the piston 40 relative to the recoil chamber 42 is a advancing room 43 which leads to the end of the main slide 1 in the closing chamber 39.
  • the opening chamber 38 and the backup chamber 42 are in communication through a pierced communication port 14 radially in the main slide 1.
  • An elastic ring 52 is housed in a throat inside the main cylinder 1 for limit the stroke of the inner slider 4 by forming a stop at the inner piston 4. This elastic ring 52 is located at the edge of the advancing chamber.
  • the closing chamber 39 is in communication with a closing hole 8 to connect a control fluid supply duct, no represent.
  • the opening chamber 38 is in communication with an aperture 9 for connect another supply conduit, no represent.
  • the control fluid is preferably air, but could also be a fluid hydraulic.
  • the main slide 1 has one end frustoconical 2 located in the distribution chamber 18. This frustoconical end 2 is intended to come into contact with a first seat 3 of the base 33, of form also frustoconical.
  • a sealing end 44 of the inner slide 4 carries a seal 5, by example a lip seal.
  • the seal 5 is intended to form a seal by contact with a second seat 6.
  • the second seat 6, of shape cylindrical, is formed in the base 33 and is coaxial with the main axis A.
  • the inner slider 4 has a longitudinal channel 11 which extends right through the slide longitudinally along the main axis A.
  • This channel longitizdinal 11 is provided with a nozzle 12 at the end sealing 44 of the inner slider.
  • This nozzle 12 has an orifice in the direction of the outlet duct.
  • a radial orifice 23 is formed in the inner slider 4 to port the longitudinal channel 11 and the recoil chamber 42.
  • the body 21 has, at its end opposite the head, the bearing 46 coaxial with the body 21 and fixed on the body, for example by screwing.
  • the bearing 46 supports a set screw 45.
  • the axis of the adjusting screw 45 is merged with the axis main.
  • the adjusting screw 45 has at its end, towards the head, a face forming a stop 51 and intended to come into contact with the end of Main slide 1.
  • Adjustment screw 45 is also pierced along its axis by a housing of balls 10.
  • the bead housing 10 has at its end a ball seat 47.
  • a ball 15 is placed in the ball housing and the ball 15 is retained at the interior of the housing by a pin 17 crossing radially housing.
  • a ball spring 48 is disposed between the ball and the pin 17 and tends to keep the ball bearing against the ball seat 47, towards the head 22.
  • a seal is performed between the ball housing 10 and a bore 49 opening at the end of the adjusting screw carrying the face forming a stop 51.
  • the inner slider 4 is also guided in bore 49. It has at its opposite end the sealing end 44, a rod 24 intended to come push the ball against the spring 48.
  • the rod 24 has a radial orifice 50 intended to communication bore 49 and longitudinal channel 11.
  • the input duct 30 must be connected to a source which makes it possible to supply the device with product powder.
  • a source which makes it possible to supply the device with product powder.
  • This can be for example a reservoir containing glass microbeads and put under pressure.
  • the device must also be connected to conduits control for supplying the opening apertures 9 and closing 8 in control air.
  • the device can also be fed with air spray.
  • a supply line is connected to the screw 45 to supply the housing 10 with air pressure spray.
  • the radial orifice 23 is provided with first removable means such as a cap 16.
  • Spray air can also be brought into the channel 11 via the radial orifice 23.
  • the bead housing 10 is closed by second removable means, such as a plug 25 shown in Figure 2.
  • air under pressure is sent to one of the opening or closing apertures 9 8 while the other port is vented, by a control device not shown.
  • the pressure in the opening chamber 38 acts on the main piston 36 to hold the slide main 1 in the open position, ie in stop against the abutment face 51 of the screw 45. This pressure also goes against action of the spring 27.
  • the pressure in the chamber of recoil 42 acts on the inner piston 40 of the slider interior 4 to push back the inner slider 4 against the elastic ring 52 in a recoil position. In this retracted position, the rod 24 presses on the ball 15 against the ball spring 48 of such so that communication is established between housing ball and bore 49. Spray air penetrates therefore by the housing of balls 10 and goes through the orifice radial 50, the bore 49, the longitudinal channel 11 and is diffused by the nozzle 12, towards the conduit of exit 31.
  • the air of atomization leads to its movement, the microbeads contained in the chamber of distribution, and drives them to the outlet duct 31, then against the deflector 32.
  • the calibration nozzle 19 determines, by its inside diameter, the flow of balls that can pass into the outlet duct.
  • the flow of microbeads can also be adjusted by the position of the main slide defined by the position of the adjusting screw. Indeed, according to the position of this adjusting screw, the passage section between the end of the main slide and the first seat 3, is more or less important.
  • the microbeads contained in the outlet duct continue to be hunted. Like the main slide 1 already forms a barrier to the flow of the microbeads, the space downstream of this dam is completely free of product. Thus, when the sealing end 44 of the slide 4 arrives on the second seat 6, in advanced position, the microbeads have already been evacuated, and it is possible to obtain an airtight seal 5 on the second seat 6. sealing is achieved at once if the inlet duct 30 is in overpressure or depression.
  • the plug 16 housed in the radial orifice 23, is disassembled, while second removable means forming a plug 26 are installed in the longitudinal channel 11 at the radial orifice 50 to close the channel.
  • the plug 16 is used as 26.
  • the dwelling of ball 10 is closed by a plug 25 (FIG. 2) provided with a small air hole, which can be protected by a filter 28, to let in and out only the air contained in ball housing 10.
  • the air spray comes from the back chamber 42 through the hole 23.
  • the inner slider 4 is in recoil position, and that the ball 15 is an obstacle to passage of air, the air can not escape through this orifice because of the presence of the plug 26.
  • the air taken in the recoil chamber 42 may flow into the longitudinal channel 11 to escape through the nozzle 12.
  • Spray air is therefore only injected when air is admitted into the recoil chamber 42, that is to say when we order the opening. So we have a simple way to configure the spray device on a machine that does not have an air source spray.
  • the device is essentially distinguished from the first mode by the fact that the jet is extended by a conical shape on the one hand, and on the other hand, by the the adjusting screw has a stop for come in contact with the inner piston only.
  • the main slide is in a open position in rear stop in one position repeatable.
  • only the remote position of inner slider can be adjusted using the screw adjustment.
  • the position is defined the nozzle inside the dispensing chamber; in particular, we define the position of the cone of this nozzle relative to the first seat. So the section passage between the distribution chamber and the conduit output can be adjusted.
  • the device comprises a body 121 extending along of a main axis A. It comprises a chamber of distribution 118 in communication with a conduit input 130 substantially perpendicular to the axis A.
  • the distribution chamber 118 communicates also with an outlet duct 131 which is substantially coaxial with the main axis A.
  • a deflector 132 is attached to the outlet duct 131 for direct the powdery product in one direction desired.
  • a base 133 mounted on the body along the axis principal A forms the connection between the distribution 118 and the outlet conduit 131.
  • the conduit output 131 is removably mounted.
  • a main slider 101 is slidably mounted in the body 121 along the main axis A.
  • the slide 101 has a built-in piston 136, and mounted sliding in a main cylinder 137.
  • the piston main 136 form with the main cylinder 137 a cylinder.
  • the main piston 136 divides the cylinder main 137 in an opening room 138 located on the side of the outlet duct 131, and a chamber of closure 139 located on the other side of the main piston 136.
  • a scraper seal 135 is carried by the body 121 to outlet of the main piston 101 in the chamber of distribution 118 and surrounds the main slider 101.
  • a spring 127 is housed in the closing chamber 139 and is supported on the one hand on a bearing 146 fixed on the body 121 and secondly on the piston 136, such so that it tends to bring the main slider 101 in the direction of the outlet duct 131.
  • An inner slider 104 is slidably mounted along the main axis A in the main slider 101.
  • a sealing end of the inner slider 104 also opens into the distribution chamber 118.
  • the main slider 101 has a cavity in which is housed a second seal wiper 171 for sealing between the two slides.
  • An inner piston 140 is also integrated into the inner slide and forms a cylinder with a cylinder 141 arranged coaxially inside the slider 101.
  • the inner piston 140 delimits a recoil chamber 142 in the cylinder 141, the chamber of recess 142 being located on the side of the outlet duct 131.
  • On the other side of the inner piston 140 relative to the back room 142 is an advanced room 143 which opens at the end of the main slider 101 in the closing chamber 139.
  • the closing chamber 139 is in communication with a closure port 108 while the opening chamber 138 is in communication with an opening opening 109.
  • the chamber opening 138 and the recess chamber 142 are in communication through a pierced opening channel 114 radially in the main slide 101.
  • a pin 161 is slidably mounted in a bore 160 practiced radially in the main slider 101.
  • the pawn 161 protrudes into a clearance 162 formed on the inner slide 104 and is held elastically in this position by a ring 164 surrounding the main slide. Clearance is limited in direction of the outlet duct 131 by a collar 163.
  • the main slider 101 has one end frustoconical 102 located in the distribution chamber 118. This frustoconical end 102 is intended to come in contact with a first seat 103 of the base 133, of also frustoconical shape.
  • the sealing end 144 of the inner slide 104 carries a seal 105, intended to form a contact seal with a second seat 106.
  • the second seat 106 of cylindrical shape, is formed in the base 133 and is coaxial with the main axis A.
  • the inner slider 104 has as in the first embodiment a longitudinal channel 111, provided with a nozzle 112 at the sealing end 144.
  • This nozzle 112 has an orifice in the direction of the duct Release. It has a pointed shape that extends beyond of the sealing end 144.
  • a radial orifice 123 is formed in the inner slider 104 to put in communication the longitudinal channel 111 and the chamber In FIG. 6, the radial orifice 123 is closed by a plug 116, to use the device with an independent source of spray air.
  • the control air as spray air in removing the cap 116 and installing a cap to close the longitudinal channel 111.
  • the body 121 At its end opposite the outlet duct 131, the body 121 comprises the bearing 146 coaxial with the body 121 and fixed on the body, for example by screwing.
  • the landing 146 supports a set screw 145 whose axis is confused with the main axis A.
  • the adjusting screw 145 has at its end, in the direction of the output 131, a stop face 151 and intended for come into contact with the inner piston 136.
  • the screw of setting 145 has the same ball device as previously described.
  • the operation of the device according to the second embodiment is similar to that according to the first embodiment.
  • the main slider 101 abuts directly against the bearing 146, while the piston interior 140 of the inner slider 104 abuts against the abutment face 151.
  • the pawn 161, forming an abutment against the collar 163, makes it possible to limit the run of the inner slider 104 relative to the main slide 101, particularly when the inner slide moves to the position of recoil, and possibly to drive the slider interior 104 when the main slider 101 is moves to the closed position.

Description

La présente invention concerne un dispositif permettant de pulvériser automatiquement des produits pulvérulents par exemple des microbilles de verre au moment du marquage des bandes de signalisation sur les routes et surfaces analogues.The present invention relates to a device to automatically spray products powders for example glass microbeads to time of the marking of the signaling strips on the roads and similar surfaces.

A titre d'exemple, on connaít et on utilise des dispositifs divers pour appliquer des microbilles de verre au moment de l'application d'un matériau destiné à effectuer la signalisation horizontale sur les routes. Les microbilles ont une fonction antidérapante et de réflexion lumineuse. Lorsque l'on souhaite obtenir uniquement une fonction antidérapante, un produit pulvérulent autre que les microbilles de verre est utilisé, tel que des minéraux concassés, par exemple de la silice. Une machine se déplaçant sur la route permet de déposer de la peinture sur le sol et, immédiatement après la peinture, les microbilles pour qu'elles adhèrent à la peinture.For example, we know and use various devices for applying microbeads of glass when applying a material intended for carry out the horizontal signaling on the roads. The microbeads have a non-slip function and light reflection. When we want to get only a non-slip function, a product powder other than glass microbeads is used, such as crushed minerals, for example silica. A machine moving on the road allows to drop paint on the floor and immediately after painting, the microbeads to adhere to painting.

C'est ainsi qu'il existe des dispositifs appelés communément « pistolets à billes » qui sont utilisés majoritairement dans le domaine du marquage routier.This is how there are devices called commonly "ball guns" that are used mainly in the field of road marking.

Les microbilles de verre sont poussées depuis un réservoir, par une pression d'air constante, puis acheminées dans le pistolet par l'intermédiaire d'une tuyauterie. Ces pistolets comportent toujours une section de passage vers un conduit de sortie, définie ou réglable suivant les modèles, ainsi qu'un pointeau de fermeture permettant d'obturer ce passage.Glass microbeads have been pushed for tank, by a constant air pressure, then routed through the gun through a piping. These guns always have a section passage to an outlet duct, defined or adjustable according to the models, as well as a closing needle to close this passage.

Les documents US 3 967 784 et US 5 169 262 décrivent de tels dispositifs dans lesquels le pointeau est destiné à coulisser dans un corps entre une position de fermeture et une position d'ouverture. Le produit pulvérulent est amené dans une chambre de distribution entourant le pointeau. Quand le pointeau est en position d'ouverture, le produit s'échappe par un conduit de sortie situé dans l'axe du pointeau. Le pointeau est amené par un piston dans la position de fermeture, dans laquelle il vient en appui sur un siège séparant une extrémité du conduit de sortie et la chambre du corps pour former un barrage.US 3,967,784 and US 5,169,262 describe such devices in which the needle is intended to slide in a body between a position closure and an open position. The product powder is brought into a distribution chamber surrounding the needle. When the needle is in position the product escapes through a conduit of output located in the axis of the needle. The needle is brought by a piston in the closed position, in which it comes to bear on a seat separating a end of the outlet duct and the body chamber to form a dam.

On constate qu'avec de tel dispositifs, il est difficile d'assurer une étanchéité totale avec une utilisation de microbilles de verre ayant différentes granulométries. Lors de l'utilisation de microbilles de verre, les microbilles risquent de se bloquer entre le siège et le pointeau. Si une grosse bille de verre reste coincée entre le siège et le pointeau, les billes plus fines peuvent continuer à passer. Il s'ensuit alors des fuites de microbilles de verre pendant l'arrêt du dispositif et surtout une consommation excessive d'air du transport des microbilles de verre. En conséquence, on a été amené à dimensionner le compresseur d'air en prenant en compte ces fuites ou à augmenter la capacité des moyens de commande du pointeau pour pouvoir écraser d'éventuelles billes coincées. Ces solutions grèvent le prix des équipements.It can be seen that with such devices, it is difficult to ensure total waterproofness with a use of glass microbeads having different sizes. When using microbeads of glass, the microbeads may get stuck between seat and the needle. If a big glass ball remains stuck between the seat and the needle, the balls more fines can continue to pass. It follows then leakage of glass microbeads during shutdown device and above all an excessive consumption of air transport of glass microbeads. As a result, we have been sized to size the air compressor taking account for these leaks or to increase the capacity of means for controlling the needle to be able to crush any jammed marbles. These solutions are equipment prices.

Par ailleurs certaines machines comportent des systèmes de remplissage, des microbilles de verre, utilisant une dépression d'air provoquée dans le réservoir. Il s'ensuit donc des aspirations d'air au niveau du barrage engendrant parfois des impossibilités d'effectuer un vide acceptable dans le réservoir pour assurer un remplissage rapide.Some machines also have filling systems, glass microbeads, using an air depression caused in the tank. It follows therefore air aspirations to Dam level sometimes leading to impossibilities to make an acceptable vacuum in the tank for ensure fast filling.

Un autre inconvénient de ces pistolets connus sur le marché est qu'ils ne permettent pas une fermeture rapide et puissante du pointeau. Le temps de réaction est long, ce qui occasionne un retard dans l'arrêt du débit des microbilles de verre, entraínant ainsi un gaspillage.Another disadvantage of these known pistols on the market is that they do not allow a closure fast and powerful needle. The reaction time is long, causing a delay in stopping the flow microbeads of glass, thus causing a waste.

Sur certains modèles de pistolets, une fluidisation est effectuée au moment du passage des microbilles de verre dans la section de passage calibrée permettant d'améliorer l'écoulement des microbilles de verre dans cet endroit. Cette fluidisation est réalisée par l'injection d'air de fluidisation, ce qui oblige le montage de ces pistolets uniquement sur des machines équipées d'une source externe d'air de fluidisation.On some models of guns, fluidization is carried out at the time of the passage of the microbeads of glass in the calibrated passage section allowing to improve the flow of glass microbeads in this place. This fluidization is carried out by fluidization air injection, which forces the mounting these guns only on machines equipped with an external source of fluidization air.

L'invention vise à fournir un dispositif de pulvérisation présentant une bonne étanchéité de fermeture.The aim of the invention is to provide a device for spray with a good seal closing.

Avec cet objectif en vue, l'invention a pour objet un dispositif de pulvérisation d'un produit pulvérulent comportant :

  • un corps s'étendant le long d'un axe principal,
  • une chambre de distribution logée dans le corps et destinée à recevoir le produit pulvérulent en entrée,
  • un conduit de sortie coaxial à l'axe principal et en communication avec la chambre de distribution pour conduire le produit pulvérulent en sortie,
  • une jonction entre la chambre de distribution et le conduit de sortie comportant un premier siège coaxial à l'axe principal,
  • un coulisseau principal monté coulissant dans le corps selon l'axe principal,
  • de premiers moyens de manoeuvre pour manoeuvrer le coulisseau principal entre une position d'ouverture, dans laquelle le passage entre la chambre de distribution et le conduit de sortie est ouvert, et une position de fermeture, dans laquelle une extrémité du coulisseau principal est en appui contre le premier siège pour fermer le passage entre la chambre de distribution et le conduit de sortie.
With this object in view, the subject of the invention is a device for spraying a powdery product comprising:
  • a body extending along a main axis,
  • a distribution chamber housed in the body and intended to receive the powdery product at the inlet,
  • an outlet duct coaxial with the main axis and in communication with the distribution chamber to drive the powdery product out,
  • a junction between the distribution chamber and the outlet duct comprising a first seat coaxial with the main axis,
  • a main slide slidably mounted in the body along the main axis,
  • first operating means for manipulating the main slide between an open position, in which the passage between the dispensing chamber and the outlet pipe is open, and a closed position, in which one end of the main slide is in abutment against the first seat to close the passage between the distribution chamber and the outlet duct.

Selon l'invention, le dispositif comporte en outre :

  • un coulisseau intérieur monté coulissant dans le coulisseau principal de manière coaxiale,
  • un deuxième siège concentrique et intérieur au premier siège,
  • de deuxièmes moyens de manoeuvre du coulisseau intérieur pour manoeuvrer le coulisseau intérieur, entre une position avancée, la plus proche du conduit de sortie et une position reculée, la plus éloignée du conduit de sortie, une extrémité d'étanchéité du coulisseau intérieur étant en contact avec le deuxième siège lorsque, simultanément, le coulisseau principal est en position de fermeture et le coulisseau intérieur est en position avancée.
According to the invention, the device further comprises:
  • an inner slide slidably mounted in the main slide coaxially,
  • a second seat concentric and interior to the first seat,
  • second means for operating the inner slider to maneuver the inner slider, between an advanced position, the closest to the outlet duct and a retracted position, furthest from the outlet duct, a sealing end of the inner slider being in contact with the second seat when, simultaneously, the main slider is in the closed position and the inner slider is in the advanced position.

Grâce à l'invention, la fermeture du débit de produit pulvérulent est obtenue en créant deux barrages successifs, ce qui permet d'obtenir une étanchéité plus sûre. Le premier barrage est réalisé par l'appui du coulisseau principal contre le premier siège, et le second barrage est obtenu par le contact du coulisseau intérieur sur le deuxième siège.Thanks to the invention, the closing of the flow of powdery product is obtained by creating two dams successive stages, which makes it possible to obtain a more safe. The first dam is made by the support of main slide against the first seat, and the second dam is obtained by the contact of the slider inside on the second seat.

Un autre objectif de l'invention est d'assurer une meilleure étanchéité à l'air entre le conduit de sortie et la chambre de distribution. C'est pourquoi le coulisseau intérieur comporte avantageusement des moyens d'étanchéité souples destinés à venir en appui contre le deuxième siège. Ce type de contact d'une matière souple, telle qu'un élastomère, sur le siège permet parfaitement d'assurer une étanchéité à l'air.Another object of the invention is to ensure a better airtightness between the outlet duct and the distribution chamber. This is why inner slide advantageously comprises means flexible sealing elements intended to bear against the second seat. This type of contact of a flexible material, such as an elastomer, on the seat makes it perfectly to ensure airtightness.

De préférence, les premiers et les deuxièmes moyens de manoeuvre sont prévus pour que la position d'ouverture soit commandée en même temps que la position reculée, et que le coulisseau principal passe en position de fermeture avant que le coulisseau intérieur passe en position avancée. Grâce à ce décalage temporel à la fermeture, le premier barrage est en place avant le second, et ainsi, le produit pulvérulent situé en aval de ce barrage peut continuer à s'écouler. Ainsi, lorsque le coulisseau intérieur arrive en contact avec le deuxième siège, ledit siège est plus sûrement libre de produit pulvérulent, et l'étanchéité est mieux garantie.Preferably, the first and the second means Maneuvering are provided for the opening position be ordered at the same time as the retracted position, and that the main slide goes into position closing before the inner slider goes into advanced position. Thanks to this time lag at the closure, the first dam is in place before the second, and so, the powdery product located downstream of this dam can continue to flow. So when the inner slide comes into contact with the second seat, said seat is more surely free of product powder, and sealing is better guaranteed.

C'est un autre objectif de l'invention de proposer un dispositif de pulvérisation ayant une grande rapidité de fermeture. C'est pourquoi les premiers moyens de manoeuvre comportent :

  • un cylindre principal ménagé dans le corps de manière coaxiale à l'axe principal,
  • un piston principal fixé sur le coulisseau principal pour former un vérin principal avec le cylindre principal en séparant le cylindre principal en une chambre d'ouverture et une chambre de fermeture,
  • un orifice d'ouverture pour alimenter la chambre d'ouverture avec un fluide et commander ainsi le passage du coulisseau principal en position d'ouverture, et
  • un orifice de fermeture pour alimenter la chambre de fermeture avec un fluide et commander ainsi le passage du coulisseau principal en position de fermeture.
It is another object of the invention to provide a spraying device having a high closing speed. This is why the first means of maneuver include:
  • a main cylinder formed in the body coaxially with the main axis,
  • a main piston fixed on the main slide to form a main cylinder with the main cylinder by separating the main cylinder into an opening chamber and a closing chamber,
  • an opening opening for supplying the opening chamber with a fluid and thereby controlling the passage of the main slide in the open position, and
  • a closing orifice for supplying the closure chamber with a fluid and thereby controlling the passage of the main slide in the closed position.

On réalise une commande avec deux vérins double effet, ce qui garantit une grande rapidité de commutation, utile à la fermeture comme à l'ouverture pour assurer au mieux, avec une grande rapidité de commutation, une synchronisation du dépôt du produit pulvérulent avec le dépôt d'une couche de peinture.We realize a command with two double cylinders effect, which guarantees a high speed of switching, useful for closing and opening to ensure the best, with a great speed of switching, a synchronization of the product deposit powder with the deposit of a layer of paint.

De manière complémentaire, les deuxièmes moyens de manoeuvre comportent :

  • un cylindre intérieur ménagé dans le coulisseau principal de manière coaxiale à l'axe principal,
  • un piston intérieur du coulisseau intérieur pour former un vérin intérieur avec le cylindre intérieur en séparant le cylindre intérieur en une chambre de recul et une chambre d'avancée, la chambre d'avancée étant en communication avec la chambre de fermeture, et
  • un orifice de communication ménagé dans le coulisseau principal pour mettre en communication la chambre de recul avec l'orifice d'ouverture par l'intermédiaire de la chambre d'ouverture.
In a complementary manner, the second means of maneuver comprise:
  • an inner cylinder formed in the main slide coaxially with the main axis,
  • an inner piston of the inner slider to form an inner cylinder with the inner cylinder by separating the inner cylinder into a recoil chamber and an advancing chamber, the advancing chamber being in communication with the closure chamber, and
  • a communication orifice formed in the main slider for communicating the recoil chamber with the opening opening via the opening chamber.

On réalise ainsi le décalage temporel entre le coulisseau principal et le coulisseau intérieur lors de la fermeture du dispositif. En- effet, lorsque l'on envoie un fluide sous pression par l'orifice de fermeture, la chambre de fermeture et la chambre d'avancée sont mises sous pression. De manière classique, la pression du fluide alimentant l'orifice d'ouverture est relâchée simultanément. Cependant, comme le fluide dans la chambre de recul doit traverser la chambre d'ouverture, la pression dans la chambre de recul reste plus importante que dans la chambre d'ouverture, ce qui ralentit le mouvement du coulisseau intérieur. Ainsi, le coulisseau principal arrive en position de fermeture avant que le coulisseau intérieur n'arrive en position avancée.The time lag between the main slide and the inner slide when closing the device. Indeed, when sending a fluid under pressure through the closing orifice, the closing chamber and the advanced chamber are put under pressure. In a classical way, the pressure of fluid supplying the opening opening is released simultaneously. However, as the fluid in the room back door must cross the opening chamber, the pressure in the recoil chamber remains greater only in the opening room, which slows down the movement of the inner slide. So, the slider the principal arrives in the closed position before the interior slider does not arrive in the advanced position.

Selon un perfectionnement, un ressort est logé dans la chambre de fermeture, le ressort tendant à déplacer le coulisseau principal vers la position de fermeture. Le décalage du coulisseau intérieur et du coulisseau principal est encore accentué du fait que le ressort aide le mouvement du coulisseau principal vers la position de fermeture. De plus, lorsque l'on commande l'ouverture en envoyant un fluide sous pression par l'orifice d'ouverture et en relâchant la pression à l'orifice de fermeture, le coulisseau principal est retenu par le ressort tandis que la chambre de recul est mise sous pression. Le coulisseau intérieur se déplace alors vers la position de recul. L'extrémité d'étanchéité est alors moins exposée aux microbilles lorsque le coulisseau principal libère le barrage au niveau du premier siège. Par ailleurs, le ressort assure que le coulisseau principal est en position de fermeture lorsque aucune pression d'air n'alimente les chambres d'ouverture et de fermeture.According to an improvement, a spring is housed in the closing chamber, the spring tending to move the main slide to the closed position. The shifting of the inner slide and slider principal is further accentuated by the fact that the spring helps the movement of the main slide towards the position of closing. Moreover, when we order the opening in sending a fluid under pressure through the orifice opening and releasing the pressure at the orifice of closure, the main slide is retained by the spring while the back chamber is put under pressure. The inner slider then moves towards the recoil position. The sealing end is then less exposed to microbeads when the slider release the dam at the level of the first seat. In addition, the spring ensures that the slide principal is in the closed position when no air pressure does not supply the rooms of opening and closing.

Selon une caractéristique avantageuse, le dispositif comporte un système de butée réglable pour positionner une butée définissant soit la position d'ouverture du coulisseau principal, soit la position de recul du coulisseau intérieur. Ainsi, on dispose d'un moyen de réglage du débit de microbilles en ajustant la section de passage entre la chambre de distribution et le conduit de sortie, par un ajustage de l'espace entre les sièges et l'extrémité du coulisseau dont la position est affectée.According to an advantageous characteristic, the device has an adjustable stop system for position a stop defining either the position opening of the main slide, ie the position of retreat of the inner slider. Thus, we have a means of adjusting the flow of microbeads by adjusting the passage section between the distribution chamber and the outlet duct, by adjusting the space between the seats and the end of the slider whose position is affected.

De manière particulière, le dispositif comporte un pion monté radialement dans le coulisseau principal et faisant saillie dans un dégagement du coulisseau intérieur, les bords du dégagement formant des butées pour limiter la course du coulisseau intérieur par rapport au coulisseau principal.In particular, the device comprises a pin mounted radially in the main slide and protruding into a clearance of the slider inside, the edges of the clearance forming stops to limit the stroke of the inner slider by compared to the main slide.

Selon d'autres perfectionnements, le corps comporte un premier joint racleur autour du coulisseau principal au débouché dans la chambre de distribution, et/ou le coulisseau principal porte un joint racleur autour du coulisseau intérieur au débouché dans la chambre de distribution. Ainsi, les surfaces de guidage des coulisseaux sont préservées de l'introduction de produit pulvérulent.According to other improvements, the body comprises a first wiper seal around the main slide at the outlet in the distribution chamber, and / or the main slide carries a wiper seal around the slider inside the outlet in the room of distribution. Thus, the guiding surfaces of slides are preserved from product introduction powder.

De préférence, le coulisseau intérieur comporte un canal longitudinal débouchant à l'extrémité d'étanchéité pour amener de l'air de pulvérisation dans l'axe du conduit de sortie. Ainsi, de l'air débouche dans le conduit de sortie selon l'axe principal et le produit pulvérulent est entraíné vers la sortie par ce flux. De plus, lorsque le coulisseau principal vient en position de fermeture, le reste de produit pulvérulent en aval du barrage au niveau du premier siège est aussi entraíné, et le deuxième siège est plus sûrement dégagé pour garantir que le contact avec l'extrémité d'étanchéité du coulisseau intérieur soit fait sans produit interposé.Preferably, the inner slider comprises a longitudinal channel leading to the sealing end to bring spray air into the axis of the outlet duct. Thus, air opens into the outlet duct along the main axis and the product powder is driven to the outlet by this flow. Of more, when the main slider comes into position the remainder of the powder product downstream of the dam at the first seat is also driven, and the second seat is more surely cleared to guarantee that the contact with the sealing end of the inner slider is made without any interposed product.

Selon une première option, le corps comporte une arrivée d'air de pulvérisation, le canal longitudinal débouche à l'autre extrémité du coulisseau intérieur, le dispositif comportant des moyens d'obturation dont l'ouverture est commandée par le coulisseau intérieur lorsque ledit coulisseau intérieur est en position reculée pour mettre en communication le canal longitudinal et l'arrivée d'air de pulvérisation, de l'air de pulvérisation pouvant être conduit alors à travers le canal longitudinal. Un tel dispositif est connecté sur une source d'air de pulvérisation, dont il est possible de prévoir un réglage de débit et de pression. L'air de pulvérisation est injecté uniquement lorsque le coulisseau intérieur est en position de recul, sa distribution étant commandée directement par le coulisseau intérieur. On dispose donc d'un moyen très simple de commande.According to a first option, the body comprises a spray air inlet, the longitudinal channel opens at the other end of the inner slider, the device comprising closure means of which the opening is controlled by the inner slider when said inner slider is in position remote to port the channel longitudinal and the arrival of spray air, the spray air can then be driven to through the longitudinal channel. Such a device is connected to a source of atomizing air, which he It is possible to provide a flow and pressure. Spray air is injected only when the inner slider is in the recoil position, its distribution being directly controlled by the inner slide. So we have a very good way simple order.

Selon une deuxième variante, le coulisseau intérieur comporte un orifice radial mettant en communication le canal longitudinal et la chambre de recul pour amener de l'air de pulvérisation dans le canal longitudinal quand de l'air sous pression dans la chambre de recul commande la position reculée. Ainsi, l'air de pulvérisation provient de l'air de commande dans la chambre de recul. Il n'est donc pas nécessaire de prévoir de source d'air de pulvérisation spécifique.According to a second variant, the slide interior has a radial orifice communication the longitudinal channel and the chamber of recoil to bring air spray into the channel longitudinal when pressurized air in the chamber reversing controls the retracted position. So, the air of spraying comes from the control air in the back room. It is therefore not necessary to provide specific spray air source.

Selon une troisième variante, qui combine les deux précédentes, le dispositif comporte en outre de premiers moyens amovibles pour obturer l'orifice radial et de deuxièmes moyens amovibles pour obturer l'arrivée d'air de pulvérisation, soit les premiers moyens, soit les deuxièmes moyens amovibles étant mis en place pour choisir la provenance d'air de pulvérisation.According to a third variant, which combines the two previous, the device further comprises first removable means for closing the radial orifice and second removable means for closing off the air intake the first means, or the second removable means being put in place to choose the source of air spray.

Les moyens amovibles sont typiquement des bouchons. Ainsi, le même dispositif pourra être utilisé indifféremment sur des machines disposant d'un générateur d'air de pulvérisation ou en étant dépourvu. En effet, selon la machine, il suffit de mettre en place l'un des bouchons et d'enlever l'autre pour convertir le dispositif. Dans une configuration, l'air de pulvérisation provient d'une source spécifique, tandis que dans l'autre cas, l'air de pulvérisation provient d'un transfert de l'air de commande provenant de la chambre de recul.The removable means are typically plugs. Thus, the same device can be used indifferently on machines with a generator spraying air or being deprived. Indeed, depending on the machine, just set up one of the plugs and remove each other to convert the device. In one configuration, the air of spray comes from a specific source, while in the other case, the spray air comes from a transfer of control air from the back room.

L'invention sera mieux comprise et d'autres particularités et avantages apparaítront à la lecture de la description qui va suivre, la description faisant référence aux dessins annexés parmi lesquels :

  • la figure 1 représente, en coupe longitudinale, un dispositif selon un premier mode de réalisation de l'invention en position d'ouverture, configuré avec une alimentation externe d'air de fluidisation ;
  • la figure 2 est une vue similaire à la figure 1, avec une configuration pour une alimentation interne de l'air de fluidisation ;
  • la figure 3 est une vue similaire à la figure 1, le dispositif étant en position de fermeture ;
  • la figure 4 est une vue du détail IV de la figure 3 ;
  • la figure 5 représente, une vue en perspective et en coupe longitudinale du dispositif de la figure 1 ;
  • la figure 6 est une vue similaire à la figure 1 d'un deuxième mode de réalisation de l'invention ;
  • la figure 7 est une vue similaire à la figure 6, le dispositif étant dans une position intermédiaire ;
  • la figure 8 est une vue similaire à la figure 6, le dispositif étant dans une position fermée ;
  • la figure 9 une vue du détail IX de la figure 8.
The invention will be better understood and other features and advantages will appear on reading the description which follows, the description referring to the appended drawings among which:
  • Figure 1 shows, in longitudinal section, a device according to a first embodiment of the invention in the open position, configured with an external supply of fluidization air;
  • Figure 2 is a view similar to Figure 1, with a configuration for an internal supply of fluidizing air;
  • Figure 3 is a view similar to Figure 1, the device being in the closed position;
  • Figure 4 is a detail view IV of Figure 3;
  • Figure 5 shows a perspective view in longitudinal section of the device of Figure 1;
  • Figure 6 is a view similar to Figure 1 of a second embodiment of the invention;
  • Figure 7 is a view similar to Figure 6, the device being in an intermediate position;
  • Figure 8 is a view similar to Figure 6, the device being in a closed position;
  • Figure 9 is a detail view IX of Figure 8.

En référence aux figures 1 à 5, un premier mode de réalisation du dispositif selon l'invention comporte un corps 21 s'étendant le long d'un axe principal A, prolongé par une tête 22. La tête 22, fixée de manière amovible sur le corps 21 par des vis 20, comporte une chambre de distribution 18 en communication avec un conduit d'entrée 30 sensiblement perpendiculaire à l'axe principal A. La chambre de distribution 18 communique également avec un conduit de sortie 31 qui est sensiblement coaxial avec l'axe principal A. Le conduit d'entrée 30 est destiné à alimenter la chambre 18 avec un produit pulvérulent tel que des microbilles de verre. Le conduit de sortie 31 est prévu pour évacuer le produit pulvérulent. Un déflecteur 32 est fixé sur le conduit de sortie 31 pour diriger le produit pulvérulent dans une direction souhaitée. Un culot 33 monté sur le corps selon l'axe principal A forme la liaison entre la chambre de distribution 18 et le conduit de sortie 31. Le conduit de sortie 31 est monté sur la tête 22 de manière amovible et il enserre également une buse 19 interchangeable contre le culot 33. La buse 19 interchangeable permet d'adapter le débit de microbilles en modifiant sa section de passage.With reference to FIGS. 1 to 5, a first mode of embodiment of the device according to the invention comprises a body 21 extending along a main axis A, extended by a head 22. The head 22, fixed in a manner removable on the body 21 by screws 20, has a distribution chamber 18 in communication with a inlet duct 30 substantially perpendicular to the axis A. The distribution chamber 18 communicates also with an outlet duct 31 which is substantially coaxial with the main axis A. The duct input 30 is intended to feed the chamber 18 with a powdery product such as glass microbeads. The outlet duct 31 is provided to evacuate the product powder. A deflector 32 is fixed on the conduit of outlet 31 to direct the powdery product into a desired direction. A base 33 mounted on the body according to the main axis A forms the connection between the chamber of distribution 18 and the outlet duct 31. The conduit outlet 31 is mounted on the head 22 removably and it also encloses an interchangeable nozzle 19 against the base 33. The interchangeable nozzle 19 makes it possible to adapt the flow of microbeads by changing its section of passage.

Un coulisseau principal 1 est monté coulissant dans le corps 21 selon l'axe principal A. Le coulisseau principal 1 comporte un piston principal 36 intégré, et monté coulissant dans un cylindre principal 37. Le piston principal 36 forme avec le cylindre principal 37 un vérin. Le piston principal 36 divise le cylindre principal 37 en une chambre d'ouverture 38 située du côté de la tête 22, et une chambre de fermeture 39 située de l'autre côté du piston principal 36. Un joint racleur 35 est porté par le corps 21 au débouché du piston principal 1 dans la chambre de distribution 18 et entoure le coulisseau principal 1. Un ressort 27 est logé dans la chambre de fermeture 39 et prend appui d'une part sur un palier 46 fixé sur le corps et d'autre part sur le piston principal 36, de telle sorte qu'il tend à amener le coulisseau principal 1 dans la direction du conduit de sortie 31.A main slide 1 is slidably mounted in the body 21 along the main axis A. The slide main 1 comprises a main piston 36 integrated, and slidably mounted in a main cylinder 37. The piston main 36 shape with the main cylinder 37 a cylinder. The main piston 36 divides the cylinder main 37 in an opening chamber 38 located on the side of the head 22, and a closing chamber 39 located the other side of the main piston 36. A wiper 35 is carried by the body 21 at the outlet of the main piston 1 in the distribution chamber 18 and surrounds the main slide 1. A spring 27 is housed in the closing chamber 39 and is supported on the one hand by a bearing 46 fixed on the body and on the other hand on the piston principal 36, so that it tends to bring the main slide 1 in the direction of the conduit exit 31.

Un coulisseau intérieur 4 est monté coulissant selon l'axe principal A dans le coulisseau principal 1. Un piston intérieur 40 est également intégré au coulisseau intérieur et forme un vérin avec un cylindre 41 ménagé coaxialement à l'intérieur du coulisseau principal 1. Le piston 40 délimite une chambre de recul 42 dans le cylindre 41, la chambre de recul 42 étant située du côté de la tête 22. De l'autre côté du piston 40 par rapport à la chambre de recul 42 se trouve une chambre d'avancée 43 qui débouche à l'extrémité du coulisseau principal 1 dans la chambre de fermeture 39. La chambre d'ouverture 38 et la chambre de recul 42 sont en communication par un orifice de communication 14 percé radialement dans le coulisseau principal 1.An inner slide 4 is slidably mounted along the main axis A in the main slide 1. An inner piston 40 is also integrated into the inner slide and forms a cylinder with a cylinder 41 arranged coaxially inside the slider main 1. The piston 40 delimits a recoil chamber 42 in the cylinder 41, the recoil chamber 42 being located on the side of the head 22. On the other side of the piston 40 relative to the recoil chamber 42 is a advancing room 43 which leads to the end of the main slide 1 in the closing chamber 39. The opening chamber 38 and the backup chamber 42 are in communication through a pierced communication port 14 radially in the main slide 1.

Un anneau élastique 52 est logé dans une gorge intérieure pratiquée dans le cylindre principal 1 pour limiter la course du coulisseau intérieur 4 en formant une butée au piston intérieur 4. Cet anneau élastique 52 est situé à la limite de la chambre d'avancée.An elastic ring 52 is housed in a throat inside the main cylinder 1 for limit the stroke of the inner slider 4 by forming a stop at the inner piston 4. This elastic ring 52 is located at the edge of the advancing chamber.

La chambre de fermeture 39 est en communication avec un orifice de fermeture 8 pour y connecter un conduit d'alimentation en fluide de commande, non représenté. La chambre d'ouverture 38 est en communication avec un orifice d'ouverture 9 pour y connecter un autre conduit d'alimentation, non représenté. Le fluide de commande est de préférence de l'air, mais pourrait être également un fluide hydraulique.The closing chamber 39 is in communication with a closing hole 8 to connect a control fluid supply duct, no represent. The opening chamber 38 is in communication with an aperture 9 for connect another supply conduit, no represent. The control fluid is preferably air, but could also be a fluid hydraulic.

Le coulisseau principal 1 comporte une extrémité tronconique 2 située dans la chambre de distribution 18. Cette extrémité tronconique 2 est destinée à venir en contact avec un premier siège 3 du culot 33, de forme également tronconique. Une extrémité d'étanchéité 44 du coulisseau intérieur 4 porte un joint d'étanchéité 5, par exemple un joint à lèvres. Le joint d'étanchéité 5 est destiné à venir former une étanchéité par contact avec un deuxième siège 6. Le deuxième siège 6, de forme cylindrique, est formé dans le culot 33 et est coaxial à l'axe principal A.The main slide 1 has one end frustoconical 2 located in the distribution chamber 18. This frustoconical end 2 is intended to come into contact with a first seat 3 of the base 33, of form also frustoconical. A sealing end 44 of the inner slide 4 carries a seal 5, by example a lip seal. The seal 5 is intended to form a seal by contact with a second seat 6. The second seat 6, of shape cylindrical, is formed in the base 33 and is coaxial with the main axis A.

Le coulisseau intérieur 4 a un canal longitudinal 11 qui s'étend de part en part à travers le coulisseau longitudinalement selon l'axe principal A. Ce canal longitizdinal 11 est muni d'un gicleur 12 à l'extrémité d'étanchéité 44 du coulisseau intérieur. Ce gicleur 12 comporte un orifice en direction du conduit de sortie. Un orifice radial 23 est ménagé dans le coulisseau intérieur 4 pour mettre en communication le canal longitudinal 11 et la chambre de recul 42.The inner slider 4 has a longitudinal channel 11 which extends right through the slide longitudinally along the main axis A. This channel longitizdinal 11 is provided with a nozzle 12 at the end sealing 44 of the inner slider. This nozzle 12 has an orifice in the direction of the outlet duct. A radial orifice 23 is formed in the inner slider 4 to port the longitudinal channel 11 and the recoil chamber 42.

Le corps 21 comporte, à son extrémité opposée à la tête, le palier 46 coaxial au corps 21 et fixé sur le corps, par exemple par vissage.The body 21 has, at its end opposite the head, the bearing 46 coaxial with the body 21 and fixed on the body, for example by screwing.

Le palier 46 supporte une vis de réglage 45. L'axe de la vis de réglage 45 est confondu avec l'axe principal. La vis de réglage 45 comporte à son extrémité, en direction de la tête, une face formant butée 51 et destinée à venir en contact avec l'extrémité du coulisseau principal 1. La vis de réglage 45 est également percée selon son axe par un logement de billes 10. Le logement de billes 10 comporte à son extrémité, un siège de bille 47. Une bille 15 est placée dans le logement de billes et la bille 15 est retenue à l'intérieur du logement par une goupille 17 traversant radialement le logement. Un ressort de bille 48 est disposé entre la bille et la goupille 17 et tend à maintenir la bille en appui contre le siège de bille 47, en direction de la tête 22. Lorsque la bille 15 est en appui contre le siège de bille 47, une étanchéité est réalisée entre le logement de bille 10 et un alésage 49 débouchant à l'extrémité de la vis de réglage portant la face formant butée 51.The bearing 46 supports a set screw 45. The axis of the adjusting screw 45 is merged with the axis main. The adjusting screw 45 has at its end, towards the head, a face forming a stop 51 and intended to come into contact with the end of Main slide 1. Adjustment screw 45 is also pierced along its axis by a housing of balls 10. The bead housing 10 has at its end a ball seat 47. A ball 15 is placed in the ball housing and the ball 15 is retained at the interior of the housing by a pin 17 crossing radially housing. A ball spring 48 is disposed between the ball and the pin 17 and tends to keep the ball bearing against the ball seat 47, towards the head 22. When the ball 15 is in bearing against the ball seat 47, a seal is performed between the ball housing 10 and a bore 49 opening at the end of the adjusting screw carrying the face forming a stop 51.

Le coulisseau intérieur 4 est guidé également dans l'alésage 49. Il comporte à son extrémité opposée à l'extrémité d'étanchéité 44, une tige 24 destinée à venir pousser la bille à l'encontre du ressort 48. La tige 24 comporte un orifice radial 50 destiné à mettre en communication l'alésage 49 et le canal longitudinal 11.The inner slider 4 is also guided in bore 49. It has at its opposite end the sealing end 44, a rod 24 intended to come push the ball against the spring 48. The rod 24 has a radial orifice 50 intended to communication bore 49 and longitudinal channel 11.

Le fonctionnement du dispositif selon l'invention va être décrit maintenant.The operation of the device according to the invention will be described now.

Pour l'utilisation du dispositif selon l'invention, le conduit d'entrée 30 doit être connecté à une source qui permet d'alimenter le dispositif en produit pulvérulent. Cela peut être par exemple un réservoir contenant des microbilles de verre et mis sous pression. Le dispositif doit également être connecté à des conduits de commande pour alimenter les orifices d'ouverture 9 et de fermeture 8 en air de commande. Le dispositif peut également être alimenté en air de pulvérisation. Dans ce cas, une conduite d'alimentation est connectée sur la vis de réglage 45 pour alimenter le logement 10 avec de l'air de pulvérisation sous pression. D'autre part, comme le montre la figure 1, l'orifice radial 23 est muni de premiers moyens amovibles tels qu'un bouchon 16.For the use of the device according to the invention, the input duct 30 must be connected to a source which makes it possible to supply the device with product powder. This can be for example a reservoir containing glass microbeads and put under pressure. The device must also be connected to conduits control for supplying the opening apertures 9 and closing 8 in control air. The device can also be fed with air spray. In this case, a supply line is connected to the screw 45 to supply the housing 10 with air pressure spray. On the other hand, as the 1, the radial orifice 23 is provided with first removable means such as a cap 16.

L'air de pulvérisation peut aussi être amené dans le canal 11 par l'intermédiaire de l'orifice radial 23. Dans ce cas, le logement de billes 10 est obturé par de deuxièmes moyens amovibles, tels qu'un bouchon 25 représenté sur la figure 2.Spray air can also be brought into the channel 11 via the radial orifice 23. In this case, the bead housing 10 is closed by second removable means, such as a plug 25 shown in Figure 2.

Pour commander l'ouverture ou la fermeture du dispositif selon l'invention, de l'air sous pression est envoyé à l'un des orifices d'ouverture 9 ou de fermeture 8 tandis que l'autre orifice est mis à l'air libre, par un dispositif de commande non représenté.To order the opening or closing of device according to the invention, air under pressure is sent to one of the opening or closing apertures 9 8 while the other port is vented, by a control device not shown.

On suppose que dans une position initiale, le dispositif se trouve dans la position telle que représentée sur la figure 1, qui est une position d'ouverture. Cette position d'ouverture est obtenue lorsque de la pression est transmise par l'orifice d'ouverture 9. Cette pression est conduite dans la chambre d'ouverture 38, et dans la chambre de recul 42 par l'intermédiaire de l'orifice de communication 14. It is assumed that in an initial position, the device is in the position as shown in Figure 1, which is a position opening. This opening position is obtained when pressure is transmitted through the orifice 9. This pressure is conducted in the opening room 38, and in the back room 42 through the communication port 14.

La pression, dans la chambre d'ouverture 38 agit sur le piston principal 36 pour maintenir le coulisseau principal 1 en position d'ouverture, c'est à dire en butée contre la face formant butée 51 de la vis de réglage 45. Cette pression va également à l'encontre de l'action du ressort 27. La pression dans la chambre de recul 42 agit sur le piston intérieur 40 du coulisseau intérieur 4 pour repousser le coulisseau intérieur 4 contre l'anneau élastique 52 dans une position de recul. Dans cette position de recul, la tige 24 appuie sur la bille 15 à l'encontre du ressort de bille 48 de telle sorte que la communication est établie entre le logement de bille et l'alésage 49. L'air de pulvérisation pénètre donc par le logement de billes 10 et passe par l'orifice radial 50, l'alésage 49, le canal longitudinal 11 et est diffusé par le gicleur 12, en direction du conduit de sortie 31. L'air de pulvérisation entraíne dans son mouvement, les microbilles contenues dans la chambre de distribution, et les entraíne vers le conduit de sortie 31, puis contre le déflecteur 32. La buse de calibration 19 détermine, par son diamètre intérieur, le débit de billes qui peut passer dans le conduit de sortie.The pressure in the opening chamber 38 acts on the main piston 36 to hold the slide main 1 in the open position, ie in stop against the abutment face 51 of the screw 45. This pressure also goes against action of the spring 27. The pressure in the chamber of recoil 42 acts on the inner piston 40 of the slider interior 4 to push back the inner slider 4 against the elastic ring 52 in a recoil position. In this retracted position, the rod 24 presses on the ball 15 against the ball spring 48 of such so that communication is established between housing ball and bore 49. Spray air penetrates therefore by the housing of balls 10 and goes through the orifice radial 50, the bore 49, the longitudinal channel 11 and is diffused by the nozzle 12, towards the conduit of exit 31. The air of atomization leads to its movement, the microbeads contained in the chamber of distribution, and drives them to the outlet duct 31, then against the deflector 32. The calibration nozzle 19 determines, by its inside diameter, the flow of balls that can pass into the outlet duct.

Le débit de microbilles peut être également ajusté par la position du coulisseau principal définie par la position de la vis de réglage. En effet, selon la position de cette vis de réglage, la section de passage entre l'extrémité du coulisseau principal et le premier siège 3, est plus ou moins importante.The flow of microbeads can also be adjusted by the position of the main slide defined by the position of the adjusting screw. Indeed, according to the position of this adjusting screw, the passage section between the end of the main slide and the first seat 3, is more or less important.

Lorsqu'on souhaite obtenir la fermeture du dispositif, de la pression est envoyée par l'orifice de fermeture 8, tandis que l'orifice d'ouverture 9 est mis à la pression atmosphérique. La pression d'air dans la chambre de fermeture 39 aidée par l'action du ressort 27 agissant sur le piston principal 36 repousse le coulisseau principal 1 dans la direction du conduit de sortie 31 jusqu'à ce que l'extrémité tronconique 2 soit en appui contre le premier siège 3. Lors du mouvement du coulisseau principal 1, la pression dans la chambre d'ouverture 38 est encore maintenue par la restriction du débit d'air sortant de la chambre d'ouverture 38. De ce fait, la pression dans la chambre de recul 42 est encore maintenue, et le mouvement du coulisseau intérieur 4 est retardé. Lorsque le coulisseau principal 1 est en butée contre le premier siège 3, dans une position de fermeture, la pression dans la chambre d'ouverture 38 chute, et l'air contenu dans la chambre de recul 42 peut s'échapper plus facilement. Alors, du fait de la pression dans la chambre d'avancée 43, on obtient le mouvement du coulisseau intérieur 4 par l'action de la pression sur le piston intérieur 40.When it is desired to close the device, pressure is sent through the orifice of closing 8, while the opening opening 9 is set to the atmospheric pressure. The air pressure in the closing chamber 39 assisted by spring action 27 acting on the main piston 36 pushes the main slide 1 in the direction of the conduit outlet 31 until the frustoconical end 2 is against the first seat 3. During the movement of the main slide 1, the pressure in the chamber opening 38 is still maintained by the restriction of air flow from the opening chamber 38. From this fact, the pressure in the recoil chamber 42 is still maintained, and the movement of the inner slider 4 is delayed. When the main slide 1 is in abutment against the first seat 3, in a position of closing, the pressure in the opening chamber 38 fall, and the air contained in the recoil chamber 42 can escape more easily. So, because of the pressure in the advanced chamber 43, we obtain the movement of the inner slide 4 by the action of the pressure on the inner piston 40.

Pendant ce temps, du fait que l'air de pulvérisation continue à sortir du gicleur 12, les microbilles contenues dans le conduit de sortie continuent à être chassées. Comme le coulisseau principal 1 forme déjà un barrage à l'écoulement des microbilles, l'espace en aval de ce barrage se dégage complètement du produit. Ainsi, lorsque l'extrémité d'étanchéité 44 du coulisseau intérieur 4 arrive sur le deuxième siège 6, en position avancée, les microbilles ont déjà été évacuées, et on peut obtenir une étanchéité à l'air par le joint d'étanchéité 5 en appui sur le deuxième siège 6. Cette étanchéité est obtenue à la fois si le conduit d'entrée 30 est en surpression ou en dépression.Meanwhile, because the air of spray continues to come out of the nozzle 12, the microbeads contained in the outlet duct continue to be hunted. Like the main slide 1 already forms a barrier to the flow of the microbeads, the space downstream of this dam is completely free of product. Thus, when the sealing end 44 of the slide 4 arrives on the second seat 6, in advanced position, the microbeads have already been evacuated, and it is possible to obtain an airtight seal 5 on the second seat 6. sealing is achieved at once if the inlet duct 30 is in overpressure or depression.

Dans le même temps, la tige 24 cesse d'appuyer contre la bille 15 et celle-ci est repoussée par le ressort de bille 48 contre le siège de bille. Le passage de l'air de pulvérisation est donc obturé.At the same time, the rod 24 stops pressing against the ball 15 and it is rejected by the ball spring 48 against the ball seat. The passage air spray is closed.

Lorsqu'on souhaite obtenir l'ouverture du dispositif, on applique une pression par l'orifice d'ouverture 9 et on commande la mise à l'air libre de l'orifice 8. Ainsi, la pression d'air augmente dans la chambre d'ouverture 38 et dans la chambre de recul 42. Cependant, le ressort 27 s'oppose initialement au déplacement du coulisseau principal 1 en agissant à l'encontre de la pression de la chambre d'ouverture 38 qui agit sur le piston principal 36. Par contre, comme la pression dans la chambre de fermeture 39 et la chambre d'avancée 43 est supprimée, rien ne s'oppose à ce que la pression de la chambre de recul 42 agisse sur le piston intérieur 40 pour obtenir le déplacement du coulisseau intérieur 4 de la position avancée vers la position de recul. Dans son mouvement vers la position de recul, le coulisseau intérieur 4 entraíne la tige 24 de telle sorte que cette tige agit sur la bille 15 et lui faire quitter sa position sur le siège de bille 47. On obtient ainsi l'ouverture de l'arrivée d'air de pulvérisation.When it is desired to open the device, a pressure is applied through the orifice opening 9 and control the venting of the orifice 8. Thus, the air pressure increases in the opening chamber 38 and in the recess chamber 42. However, spring 27 initially opposes moving the main slider 1 by acting at against the pressure of the opening chamber 38 acting on the main piston 36. On the other hand, as the pressure in the closing chamber 39 and the chamber 43 is deleted, there is nothing to prevent the pressure of the recoil chamber 42 acts on the piston 40 inside to get the slide 4 inside the advanced position towards the position of decline. In its movement towards the recoil position, the inner slide 4 drives the rod 24 so that this rod acts on the ball 15 and make him leave its position on the ball seat 47. This results in the opening of the spray air inlet.

Dans le même temps, la pression dans la chambre d'ouverture 38 devient suffisante pour contrer l'action du ressort 27 et obtenir ainsi le mouvement du coulisseau principal vers la position d'ouverture, et se retrouve ainsi dans la position montrée sur la figure 1, dans laquelle le coulisseau principal est en butée contre la vis de réglage 45.At the same time, the pressure in the room opening 38 becomes sufficient to counter the action of the spring 27 and thus obtain the movement of the slider principal to the open position, and ends up thus in the position shown in Figure 1, in which the main slide is in abutment against the adjusting screw 45.

Dans la configuration montrée sur la figure 2, le bouchon 16, logé dans l'orifice radial 23, est démonté, tandis que de deuxièmes moyens amovibles formant un bouchon 26 sont installés dans le canal longitudinal 11 au niveau de l'orifice radial 50 pour obturer le canal. De manière avantageuse, le bouchon 16 est utilisé comme bouchon 26. Dans cette dernière position, le logement de bille 10 est fermé par un bouchon 25 (figure 2) muni d'un petit trou d'air, pouvant être protégé par un filtre 28, pour ne laisser entrer et sortir que l'air contenu dans le logement de bille 10.In the configuration shown in Figure 2, the plug 16, housed in the radial orifice 23, is disassembled, while second removable means forming a plug 26 are installed in the longitudinal channel 11 at the radial orifice 50 to close the channel. Advantageously, the plug 16 is used as 26. In this latter position, the dwelling of ball 10 is closed by a plug 25 (FIG. 2) provided with a small air hole, which can be protected by a filter 28, to let in and out only the air contained in ball housing 10.

Dans cette configuration, l'air de pulvérisation provient de la chambre de recul 42 en passant par le trou radial 23. Même si le coulisseau intérieur 4 est en position de recul, et que la bille 15 ne fait obstacle au passage de l'air, l'air ne peut pas s'échapper par cet orifice du fait de la présence du bouchon 26. Ainsi l'air prélevé dans la chambre de recul 42 peut s'écouler dans le canal longitudinal 11 pour s'échapper par le gicleur 12. De l'air de pulvérisation n'est donc injecté que lorsque de l'air est admis dans la chambre de recul 42, c'est-à-dire quand on commande l'ouverture. On a donc un moyen simple de configurer le dispositif de pulvérisation sur une machine ne disposant pas de source d'air de pulvérisation.In this configuration, the air spray comes from the back chamber 42 through the hole 23. Although the inner slider 4 is in recoil position, and that the ball 15 is an obstacle to passage of air, the air can not escape through this orifice because of the presence of the plug 26. Thus the air taken in the recoil chamber 42 may flow into the longitudinal channel 11 to escape through the nozzle 12. Spray air is therefore only injected when air is admitted into the recoil chamber 42, that is to say when we order the opening. So we have a simple way to configure the spray device on a machine that does not have an air source spray.

Lors d'une opération de maintenance du dispositif, il est possible de démonter le conduit de sortie 31 et la buse 19 sans pour autant compromettre l'étanchéité entre la chambre de distribution et le conduit de sortie 31. L'opération de maintenance en est facilitée.During a maintenance operation of the device, it is possible to dismantle the outlet duct 31 and the nozzle 19 without compromising the seal between the distribution chamber and the outlet duct 31. The maintenance operation is facilitated.

Dans un deuxième mode de réalisation de l'invention, représenté sur les figures 6 à 9, le dispositif se distingue essentiellement du premier mode de réalisation par le fait que le gicleur se prolonge par une forme conique d'une part, et d'autre part, par le fait que la vis de réglage comporte une butée destinée à venir en contact avec le piston intérieur uniquement. De ce fait, lorsque le dispositif est en position d'ouverture, le coulisseau principal est dans une position d'ouverture en butée arrière dans une position répétable. Par contre, seule la position reculée du coulisseau intérieur peut être ajustée à l'aide de la vis de réglage. Grâce à cet ajustage, on définit la position du gicleur à l'intérieur de la chambre de distribution ; en particulier, on définit la position du cône de ce gicleur par rapport au premier siège. Ainsi, la section de passage entre la chambre de distribution et le conduit de sortie peut être ajustée.In a second embodiment of the invention, shown in FIGS. 6 to 9, the device is essentially distinguished from the first mode by the fact that the jet is extended by a conical shape on the one hand, and on the other hand, by the the adjusting screw has a stop for come in contact with the inner piston only. Of this fact, when the device is in position opening, the main slide is in a open position in rear stop in one position repeatable. However, only the remote position of inner slider can be adjusted using the screw adjustment. With this adjustment, the position is defined the nozzle inside the dispensing chamber; in particular, we define the position of the cone of this nozzle relative to the first seat. So the section passage between the distribution chamber and the conduit output can be adjusted.

Le dispositif selon le deuxième mode de réalisation de l'invention comporte un corps 121 s'étendant le long d'un axe principal A. Il comporte une chambre de distribution 118 en communication avec un conduit d'entrée 130 sensiblement perpendiculaire à l'axe principal A. La chambre de distribution 118 communique également avec un conduit de sortie 131 qui est sensiblement coaxial avec l'axe principal A. Un déflecteur 132 est fixé sur le conduit de sortie 131 pour diriger le produit pulvérulent dans une direction souhaitée. Un culot 133 monté sur le corps selon l'axe principal A forme la liaison entre la chambre de distribution 118 et le conduit de sortie 131. Le conduit de sortie 131 est monté de manière amovible.The device according to the second embodiment of the invention comprises a body 121 extending along of a main axis A. It comprises a chamber of distribution 118 in communication with a conduit input 130 substantially perpendicular to the axis A. The distribution chamber 118 communicates also with an outlet duct 131 which is substantially coaxial with the main axis A. A deflector 132 is attached to the outlet duct 131 for direct the powdery product in one direction desired. A base 133 mounted on the body along the axis principal A forms the connection between the distribution 118 and the outlet conduit 131. The conduit output 131 is removably mounted.

Un coulisseau principal 101 est monté coulissant dans le corps 121 selon l'axe principal A. Le coulisseau principal 101 comporte un piston 136 intégré, et monté coulissant dans un cylindre principal 137. Le piston principal 136 forme avec le cylindre principal 137 un vérin. Le piston principal 136 divise le cylindre principal 137 en une chambre d'ouverture 138 située du côté du conduit de sortie 131, et une chambre de fermeture 139 située de l'autre côté du piston principal 136. Un joint racleur 135 est porté par le corps 121 au débouché du piston principal 101 dans la chambre de distribution 118 et entoure le coulisseau principal 101. Un ressort 127 est logé dans la chambre de fermeture 139 et prend appui d'une part sur un palier 146 fixé sur le corps 121 et d'autre part sur le piston 136, de telle sorte qu'il tend à amener le coulisseau principal 101 dans la direction du conduit de sortie 131.A main slider 101 is slidably mounted in the body 121 along the main axis A. The slide 101 has a built-in piston 136, and mounted sliding in a main cylinder 137. The piston main 136 form with the main cylinder 137 a cylinder. The main piston 136 divides the cylinder main 137 in an opening room 138 located on the side of the outlet duct 131, and a chamber of closure 139 located on the other side of the main piston 136. A scraper seal 135 is carried by the body 121 to outlet of the main piston 101 in the chamber of distribution 118 and surrounds the main slider 101. A spring 127 is housed in the closing chamber 139 and is supported on the one hand on a bearing 146 fixed on the body 121 and secondly on the piston 136, such so that it tends to bring the main slider 101 in the direction of the outlet duct 131.

Un coulisseau intérieur 104 est monté coulissant selon l'axe principal A dans le coulisseau principal 101. Une extrémité d'étanchéité du coulisseau intérieur 104 débouche également dans la chambre de distribution 118. A ce niveau, le coulisseau principal 101 comporte une cavité dans laquelle est logé un deuxième joint racleur 171 pour réaliser une étanchéité entre les deux coulisseaux. An inner slider 104 is slidably mounted along the main axis A in the main slider 101. A sealing end of the inner slider 104 also opens into the distribution chamber 118. A this level, the main slider 101 has a cavity in which is housed a second seal wiper 171 for sealing between the two slides.

Un piston intérieur 140 est également intégré au coulisseau intérieur et forme un vérin avec un cylindre 141 ménagé coaxialement à l'intérieur du coulisseau principal 101. Le piston intérieur 140 délimite une chambre de recul 142 dans le cylindre 141, la chambre de recul 142 étant située du côté du conduit de sortie 131. De l'autre côté du piston intérieur 140 par rapport à la chambre de recul 142 se trouve une chambre d'avancée 143 qui débouche à l'extrémité du coulisseau principal 101 dans la chambre de fermeture 139. La chambre de fermeture 139 est en communication avec un orifice de fermeture 108 tandis que la chambre d'ouverture 138 est en communication avec un orifice d'ouverture 109. La chambre d'ouverture 138 et la chambre de recul 142 sont en communication par un canal d'ouverture 114 percé radialement dans le coulisseau principal 101.An inner piston 140 is also integrated into the inner slide and forms a cylinder with a cylinder 141 arranged coaxially inside the slider 101. The inner piston 140 delimits a recoil chamber 142 in the cylinder 141, the chamber of recess 142 being located on the side of the outlet duct 131. On the other side of the inner piston 140 relative to the back room 142 is an advanced room 143 which opens at the end of the main slider 101 in the closing chamber 139. The closing chamber 139 is in communication with a closure port 108 while the opening chamber 138 is in communication with an opening opening 109. The chamber opening 138 and the recess chamber 142 are in communication through a pierced opening channel 114 radially in the main slide 101.

En vis-à-vis du canal d'ouverture 114, un pion 161 est monté coulissant dans un alésage 160 pratiqué radialement dans le coulisseau principal 101. Le pion 161 fait saillie dans un dégagement 162 ménagé sur le coulisseau intérieur 104 et est maintenu élastiquement dans cette position par un jonc 164 entourant le coulisseau principal. Le dégagement est limité en direction du conduit de sortie 131 par une collerette 163.Opposite the opening channel 114, a pin 161 is slidably mounted in a bore 160 practiced radially in the main slider 101. The pawn 161 protrudes into a clearance 162 formed on the inner slide 104 and is held elastically in this position by a ring 164 surrounding the main slide. Clearance is limited in direction of the outlet duct 131 by a collar 163.

Le coulisseau principal 101 comporte une extrémité tronconique 102 située dans la chambre de distribution 118. Cette extrémité tronconique 102 est destinée à venir en contact avec un premier siège 103 du culot 133, de forme également tronconique. L'extrémité d'étanchéité 144 du coulisseau intérieur 104 porte un joint d'étanchéité 105, destiné à venir former une étanchéité par contact avec un deuxième siège 106. Le deuxième siège 106, de forme cylindrique, est formé dans le culot 133 et est coaxial à l'axe principal A.The main slider 101 has one end frustoconical 102 located in the distribution chamber 118. This frustoconical end 102 is intended to come in contact with a first seat 103 of the base 133, of also frustoconical shape. The sealing end 144 of the inner slide 104 carries a seal 105, intended to form a contact seal with a second seat 106. The second seat 106, of cylindrical shape, is formed in the base 133 and is coaxial with the main axis A.

Le coulisseau intérieur 104 comporte comme dans le premier mode de réalisation un canal longitudinal 111, muni d'un gicleur 112 à l'extrémité d'étanchéité 144. Ce gicleur 112 comporte un orifice en direction du conduit de sortie. Elle a une forme en pointe qui s'étend au-delà de l'extrémité d'étanchéité 144. Un orifice radial 123 est ménagé dans le coulisseau intérieur 104 pour mettre en communication le canal longitudinal 111 et la chambre de recul 142. Sur la figure 6, l'orifice radial 123 est obturé par un bouchon 116, pour utiliser le dispositif avec une source indépendante d'air de pulvérisation. De même que dans le premier mode de réalisation, on peut utiliser l'air de commande comme air de pulvérisation en supprimant le bouchon 116 et en installant un bouchon pour obturer le canal longitudinal 111.The inner slider 104 has as in the first embodiment a longitudinal channel 111, provided with a nozzle 112 at the sealing end 144. This nozzle 112 has an orifice in the direction of the duct Release. It has a pointed shape that extends beyond of the sealing end 144. A radial orifice 123 is formed in the inner slider 104 to put in communication the longitudinal channel 111 and the chamber In FIG. 6, the radial orifice 123 is closed by a plug 116, to use the device with an independent source of spray air. Of same as in the first embodiment, one can use the control air as spray air in removing the cap 116 and installing a cap to close the longitudinal channel 111.

A son extrémité opposée au conduit de sortie 131, le corps 121 comporte le palier 146 coaxial au corps 121 et fixé sur le corps, par exemple par vissage. Le palier 146 supporte une vis de réglage 145 dont l'axe est confondu avec l'axe principal A. La vis de réglage 145 comporte à son extrémité, en direction du conduit de sortie 131, une face formant butée 151 et destinée à venir en contact avec le piston intérieur 136. La vis de réglage 145 comporte le même dispositif à bille que décrit précédemment.At its end opposite the outlet duct 131, the body 121 comprises the bearing 146 coaxial with the body 121 and fixed on the body, for example by screwing. The landing 146 supports a set screw 145 whose axis is confused with the main axis A. The adjusting screw 145 has at its end, in the direction of the output 131, a stop face 151 and intended for come into contact with the inner piston 136. The screw of setting 145 has the same ball device as previously described.

Le fonctionnement du dispositif selon le deuxième mode de réalisation est similaire à celui selon le premier mode de réalisation. Cependant, En position d'ouverture, le coulisseau principal 101 vient en butée directement contre le palier 146, tandis que le piston intérieur 140 du coulisseau intérieur 104 vient en butée contre la face formant butée 151. Le pion 161, en formant une butée contre la collerette 163, permet de limiter la course du coulisseau intérieur 104 par rapport au coulisseau principal 101, en particulier lorsque le coulisseau intérieur se déplace vers la position de recul, et éventuellement d'entraíner le coulisseau intérieur 104 lorsque le coulisseau principal 101 se déplace vers la position de fermeture.The operation of the device according to the second embodiment is similar to that according to the first embodiment. However, in position opening, the main slider 101 abuts directly against the bearing 146, while the piston interior 140 of the inner slider 104 abuts against the abutment face 151. The pawn 161, forming an abutment against the collar 163, makes it possible to limit the run of the inner slider 104 relative to the main slide 101, particularly when the inner slide moves to the position of recoil, and possibly to drive the slider interior 104 when the main slider 101 is moves to the closed position.

Claims (11)

  1. Device for pulverizing a powdery product, consisting of:
    a body (21, 22) extending along the length of a main axis A,
    a supply chamber (18) housed in the body (21) and designed to hold the powdery product on entry,
    an outlet duct (31) coaxial to the main axis and in communication with the supply chamber (18) to carry the powdery product to the outlet,
    a junction between the supply chamber (18) and the outlet duct (31) including a first seat (3) coaxial to the main axis A,
    a main slide (1) mounted by sliding into the body (21) along the main axis A,
    first means of operation (36, 37) to move the main slide (1) between an open position, in which the passage between the supply chamber (18) and the outlet duct (31) is open, and a closed position, in which one end of the main slide (1) is in contact with the first seat (3) to close the passage between the supply chamber (18) and the outlet duct (31),
    characterised in that it also includes:
    an internal slide (4) mounted by sliding onto the main slide (1) coaxially,
    a second seating (6) which is concentric and inside the first seating (3),
    second means of operation (40, 41) the inner slide (4) to move the inner slide (4), between a forward position, closest to the outlet duct (31) and a reverse position, farest from the outlet duct (31), an end seal on the inner slide (4) in contact with the second seat (6) when the main slide (1) is closed and the inner slide (4) is in forward position at the same time.
  2. Device according to claim 1, characterised in that the inner slide (4) includes flexible seals (6) designed to be in contact with the second seat (6).
  3. Device according to claim 1, characterised in that it has an adjustable stop system (45) to position a stop (51, 151) defining either the main slide open position (1), or the inner slide reverse position (104).
  4. Device according to claim 1, characterised in that the first and second means of operation are designed so that the open position is controlled at the same time as the reverse position, and that the main slide (1) moves into closed position before the inner slide (4) moves into forward position.
  5. Device according to claim 3, characterised in that the initial means of operation include:
    a main cylinder (37) inserted in the body (21) coaxially to the main axis A,
    a main piston (36) of the main slide (1) to form a main actuator with the main cylinder (37) splitting the main cylinder into an opening chamber (38) and a closing chamber (39),
    an opening hole (9) to supply the opening chamber (38) with a fluid and thereby control passage of the main slide (1) to open position, and
    a closing hole (8) to supply the closing chamber (39) with a fluid and thereby control passage of the main slide (1) to closed position.
  6. Device according to claim 5, characterised in that the second means of operation include:
    an internal cylinder (41) inserted in the main slide (1) coaxially with the main axis A,
    an internal piston (40) of the inner slide (4) forming an internal actuator with the inner cylinder (41) splitting the inner cylinder into a reverse chamber (42) and a forward chamber (43), the forward chamber (43) being in communication with the closing chamber (39), and
    a communication hole (14) in the main slide (1) to put the reverse chamber (42) into communication with the opening hole (9) via the opening chamber (38).
  7. Device according to claim 6, characterised in that it includes a spring (27) housed in the closing chamber (39), this spring (27) tending to move the main slide (1) towards closing position.
  8. Device according to claim 3, characterised in that it includes a pin (161) mounted radially in the main slide (101) and protruding in a release (162) of the inner slide (104), the edges of this release forming stops to limit the inner slide's travel (104) relative to the main slide (101).
  9. Device according to claim 1, characterised in that the inner slide (4) includes a longitudinal channel (11) opening at the sealed end (44) to bring the air used for pulverization into the axis of the outlet duct (31).
  10. Device according to claim 9, characterised in that the body (21) includes an intake (10) for pulverization air, the longitudinal channel (11) opening into the other end of the inner slide (4), the device including means of closure (15, 48, 47), the opening of which is controlled by the inner slide (4) when the said inner slide (4) is in reverse position, to put the longitudinal channel (11) into communication with the pulverization air intake (10), so that the pulverization air can be carried through the longitudinal channel (11).
  11. Device according to claim 9, characterised in that the inner slide (4) includes a radial hole (23) putting the longitudinal channel (11) into communication with the reverse chamber (42) to carry the pulverization air into the longitudinal channel (11) when the pressurized air in the reverse chamber (42) controls the reverse position.
EP20030366005 2002-08-13 2003-07-28 Dispenser for particulate material like glass beads Expired - Lifetime EP1389651B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0210266A FR2843599B1 (en) 2002-08-13 2002-08-13 WATERPROOF DEVICE WITH INTERNAL OR EXTERNAL AIR INTAKE FOR SPRAYING ALL KIND OF GLASS BALL MICROS ON SIGNAL STRIPS WITH A ROAD MARKING MACHINE
FR0210266 2002-08-13

Publications (2)

Publication Number Publication Date
EP1389651A1 EP1389651A1 (en) 2004-02-18
EP1389651B1 true EP1389651B1 (en) 2005-06-01

Family

ID=30471099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030366005 Expired - Lifetime EP1389651B1 (en) 2002-08-13 2003-07-28 Dispenser for particulate material like glass beads

Country Status (3)

Country Link
EP (1) EP1389651B1 (en)
DE (1) DE60300758T2 (en)
FR (1) FR2843599B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100984646B1 (en) * 2010-03-22 2010-10-01 주식회사 진산기계 Give up the lane conditioner equipped with jet beads

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425557A (en) * 2005-04-28 2006-11-01 Prismo Ltd Distributor device for retroreflective articles
US7429146B2 (en) * 2005-06-09 2008-09-30 Potters Industries, Inc. Highway marking sphere dispensing apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967784A (en) * 1975-05-16 1976-07-06 Idaho Norland Corporation Bead dispensing gun for marking pavement
US5169262A (en) * 1982-11-30 1992-12-08 Road Construction Authority Line marking apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100984646B1 (en) * 2010-03-22 2010-10-01 주식회사 진산기계 Give up the lane conditioner equipped with jet beads

Also Published As

Publication number Publication date
FR2843599B1 (en) 2004-10-01
FR2843599A1 (en) 2004-02-20
EP1389651A1 (en) 2004-02-18
DE60300758D1 (en) 2005-07-07
DE60300758T2 (en) 2006-03-23

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