EP0049248A1 - Dispositif pour revetir des pieces par projection de poudre dans un champ electrostatique. - Google Patents

Dispositif pour revetir des pieces par projection de poudre dans un champ electrostatique.

Info

Publication number
EP0049248A1
EP0049248A1 EP81900716A EP81900716A EP0049248A1 EP 0049248 A1 EP0049248 A1 EP 0049248A1 EP 81900716 A EP81900716 A EP 81900716A EP 81900716 A EP81900716 A EP 81900716A EP 0049248 A1 EP0049248 A1 EP 0049248A1
Authority
EP
European Patent Office
Prior art keywords
coating device
powder
container
adjustable
carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81900716A
Other languages
German (de)
English (en)
Other versions
EP0049248B1 (fr
Inventor
Gerhard Fredrich Vohringer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Esb Elektrostatische Spruh- und Beschichtungsanlagen Gf Vohringer GmbH
ESB VOEHRINGER
Original Assignee
Esb Elektrostatische Spruh- und Beschichtungsanlagen Gf Vohringer GmbH
ESB VOEHRINGER
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esb Elektrostatische Spruh- und Beschichtungsanlagen Gf Vohringer GmbH, ESB VOEHRINGER filed Critical Esb Elektrostatische Spruh- und Beschichtungsanlagen Gf Vohringer GmbH
Priority to AT81900716T priority Critical patent/ATE9966T1/de
Publication of EP0049248A1 publication Critical patent/EP0049248A1/fr
Application granted granted Critical
Publication of EP0049248B1 publication Critical patent/EP0049248B1/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1477—Arrangements for supplying particulate material means for supplying to several spray apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials

Definitions

  • the invention relates to a coating device for coating workpieces by spraying powder in an electrostatic field, with a processing container arranged close to the spraying point and connected to a powder supply, which has removal openings for a plurality of spray guns which are held pivotably and preparation means assigned to each removal opening.
  • Spray point to arrange an elongated vertical preparation container, which has a number of discharge openings for the powder to be sprayed, lying one above the other in a generatrix, with a spray gun which is operated by secondary air in the manner of an injector and is adjustable at each extraction opening.
  • the processing container which is fitted with a ventilation floor at the bottom, is refilled with a powder storage container during operation.
  • the invention is based on the type of a coating device described at the outset and serves the task of developing this coating device in such a way that the spray guns can be controlled and adjusted with greater reliability despite the dense arrangement on the preparation tank.
  • the Processing means assigned to removal openings are designed to be mechanically independent of the flow, and each spray gun is arranged spatially separated from the assigned removal opening and connected to it by a hose.
  • the guns can be set to a workpiece as desired. They can be laterally offset from one another in different ways, have quite different spacing at high altitudes and can be inclined to each other or to any reference direction in extremely different ways.
  • the guns are also completely independent of each other with regard to switching on and off and - if the appropriate control devices are available - also controllable with regard to the spray intensity, since the mechanical preparation means that no secondary air passages can arise. Such conceivable side flows also counteract that a hose, however short, slows down the flow due to the friction on its wall.
  • the spray guns can be carried by the preparation container and then replaced with this container.
  • the preparation tank is easily exchangeably connected by quick coupling means to an equipment carrier which has the electrical and fluidic connections for the spray guns and the injectors preferably assigned to them. All you have to do is loosen the couplings and hose connections and you can change the treatment tank.
  • the pistols are preferably fired in at least one direction adjustable length adjustable on the implement carrier.
  • each spray gun is pivotally adjustable on all sides attached to the free end of a cantilever arm, which is at least adjustable in the rear on a holder of the device carrier. It is even better if the extension arm can be swiveled around its own axis and, if possible, around another axis, so that each gun can be held and adjusted as desired.
  • extension arm in a tubular shape; it can then enclose an electrical cable, in particular the high-voltage supply.
  • the equipment carrier is expediently guided in a height-adjustable manner, in particular on a horizontally movable stand, and is connected to it by flexible lines.
  • the equipment carrier can be attached in a vertical guide by means of a servomotor such as a cylinder unit with adjustable speed.
  • This actuator can be used for positioning, but also for automatic back and forth movement during the spraying process.
  • a pneumatic or electrical one can in principle also be provided.
  • the stand can itself form a storage container for coating powder Be, which is connected by at least one feed line to the processing container.
  • two sensors can be attached to the powder level, which also enable the control of fresh air and recovery pump in a certain ratio.
  • the processing container which is cylindrical in a known manner and expediently arranged vertically, can rotatably accommodate a stirring shaft which has at least one transversely projecting stirring element in the region of each removal opening, which is preferably moved back and forth.
  • an axially parallel stirring pin can be attached to the end of a radial arm.
  • the lower end of the agitator shaft can be coupled to an agitator motor attached to the implement carrier by means of a coupling, in particular a claw coupling, which can be brought into and out of engagement by means of relative axial movement.
  • the coupling is effected immediately when the processing container can be suspended in angular slots in the side wall parts of the device carrier.
  • the cylindrical powder container is expediently provided at its upper end with tangentially entering powder feed connections and a central exhaust pipe.
  • the powder is then introduced in a rotating manner and the transport air is drawn off from a lower point and conveyed up.
  • the drawing shows an embodiment of the invention, for example. Show it
  • FIG. 1 shows a partially sectioned side view of a coating device according to the invention
  • FIG. 2 shows a top view partly in section along the line II-II in FIG. 1.
  • the coating device shown consists essentially of borrow from a movable on the room floor T carriage 2 which holds a device holder 5 on a towering stand 3 by means of guides 4 adjustable in height, on which, on the one hand, a processing container 6 is detachably and interchangeably held and three spray guns 8 are held by means of cantilever arms 7.
  • the upper part of the stand 3 can form a powder container 9, the lower part 10 a high voltage generator, a compressed air source such as a compressor and possibly further electrical and pneumatic connections and assemblies. on /
  • the compressed air source is connected by a hose 11 to a possibly designed as a quick connector 12 of the equipment carrier S, and from the high-voltage generator leads a collecting cable 13 to the equipment carrier, where it is branched into individual high-voltage cables 14, each through the tubular boom 7 are guided to a spray gun 8.
  • the cylinder 16, on the other hand, is fastened to the stand 3 by means of a plate 55 in the guides 4 in an adjustable manner via an intermediate carrier 19.
  • On this plate guide rollers 56 are also mounted, which run from the inside on the walls of the device carrier 5 and thereby form a swivel alignment around the axis of the cylinder unit 15, which represents the actual longitudinal guide.
  • the cylinder 16 can be fed by two hoses 20 from a control (not shown) in the lower space 10 of the stator by compressed air from the compressed air source there or by a separate, possibly interposed flow medium such as pressurized oil or the like any other suitable drive motor, such as a rotary 'compressed air motor with rack or spindle drive or an electric motor, possibly with a cable winch, can be used.
  • a control not shown
  • a separate, possibly interposed flow medium such as pressurized oil or the like
  • any other suitable drive motor such as a rotary 'compressed air motor with rack or spindle drive or an electric motor, possibly with a cable winch, can be used.
  • the adjustment can be used for the usual height positioning of the carrier 5 up to the upper end position shown with broken lines 54, but also for a constant oscillation between these end positions or certain intermediate positions, for example with limit switches, the instantaneous speed depending on the covered route can change independently.
  • the equipment carrier 5 has essentially the shape of a rectangular box which is opened on opposite sides and the interior of which is divided into two pockets 22, 23 by an intermediate wall 21.
  • the two connecting blocks 18 for the cylinder unit 15 enclosed by the pocket 22 are attached.
  • At least one coupling projection 24 of the processing container 6 protrudes into the pocket 23 and is suspended on both sides by an attached screw 25 in angle slots 26 of the side pocket walls.
  • lever screw 25, 26 it is also possible to place a lever nut, a wing nut or the like on a possibly continuous threaded bolt. Sometimes it is also sufficient to clamp only on one of the two sides or to separate the guide and alignment on the one hand from the clamping devices on the other.
  • the processing container 6 has the shape of an elongated, thin cylinder, which has at its upper end two tangentially opening supply nozzles 28 for fresh powder and for recovered powder. At least one of these feed nozzles is connected to the powder storage container 9 mounted in the stand by a feed line (not shown). Possibly.
  • This storage container can also be divided into two container spaces for fresh powder and recovered powder, and means can be provided for metering both powders in a predetermined ratio.
  • the powder-air mixture is introduced into the processing container 6 in a rotating manner, which on the one hand causes a mixing of the two types of powder and on the other hand separates the powder from the gas flow, which collects further inside during a helical downward movement and through one centric outlet pipe 29, which is guided down about 15% of the container height, again got out at the top.
  • lateral inlet openings 30 are provided above the lower end of the outlet pipe 29.
  • an agitator shaft 31 sits rotatably and centrally to the processing container in the bearing 35, which has at least one radially projecting stirring arm 33 at the level of each removal opening 32 for the individual spray guns, at the end of which a pin-shaped stirring element 34 is fastened axially parallel.
  • the lower end of the agitator shaft 31 protrudes from the preparation tank 6 into a further bearing 36 and is connected to a stirrer motor 38 by a claw coupling 37 or another clutch that can only be opened by relative movement in the axial direction.
  • This is connected by a hose 39 to the compressed air source in the stator space 10 and constantly executes a back and forth movement over an optionally adjustable angle of approximately 90 ° to 180 ° according to double arrow 52 in FIG. 2.
  • the two coupling parts are automatically centered when the processing container is suspended in the angled slots 26 and are brought into engagement in the same way as they are released again when the container handles 53 are lifted off.
  • agitator By having the agitator move back and forth, it can also be rotated continuously, which alone results in an improved loosening effect with some types of powder.
  • a further improvement can be achieved with a rotating agitator, above all, by introducing a further regularly or irregularly movable part, for example a part running like a planet, by introducing a spring or the like which reacts in an irregular manner.
  • an injector 40 is connected, to which, by means of a short line 41, conveying air and a further short line 42, metering air is supplied from a socket-like quick connector 43 fixedly attached to the device carrier 5.
  • the individual quick couplings 43 are connected to the compressed air connection 12 in a manner not shown in detail. Short line parts can also be fixedly attached to the device carrier and connected to the injector 40 in an easily detachable manner by quick couplings.
  • the injector is in turn connected to the spray gun 8 by means of a hose 44, which can have a length of approximately 40 to 60 cm. This hose also has to be detached if a processing container 6 is to be removed during the color change.
  • a setting valve 45 for conveying air and a setting valve 46 for metering air are provided on each injector 40.
  • the dosing air is placed as a rotary veil around the suction path of the powder from the removal opening 32 in such a way that the conveyance of powder is completely prevented when the dosing air valve 46 is fully open.
  • the adjustment valves 45 and 46 or corresponding adjusting elements can of course also be provided there.
  • the metering valve 46 will therefore first be opened completely and then the feed air valve 45 may be opened further to remove all powder residues
  • Each cantilever arm 7 is held in a longitudinally displaceable manner in a clamping chuck 47 which is fixedly arranged on the equipment carrier 5 and can be braced by a screw lever 48.
  • the cantilever arm 7 can thus be freely moved in the longitudinal direction in the released clamping chuck.
  • the clamping chuck 47 or another holding means can also be provided such that it can be pivoted, for example horizontally or about several axes.
  • the spray gun 8 can therefore be pivoted and fixed almost indefinitely at least about a vertical axis. It is even better to use a spherical surface.
  • the setting angle is only limited when the high-voltage cable 14 is to be passed through the holder 49. This limitation does not apply if the cable is routed to the gun outside of this holder.
  • the cylindrical configuration of the cantilever arm 7 it can also be rotated about its axis in the pipe clamp 47 with the spray gun. As a result, all spray guns used can be arranged and adjusted in almost any way to enable optimal coating of a workpiece from different directions.
  • an air tray 50 is also installed here, which can possibly be fed through a line 51 and can be put into operation in the case of an unfavorable powder composition, but this is only a matter of temporary use, which is under the loosen the powder located at the bottom of the dispensing opening, which could otherwise condense otherwise.
  • This air floor is not required for the actual spraying operation.
  • several powder storage containers can be attached to the carriage 2 or on a separate carriage and can only be connected to the feed connector 28 by coupling. Complete coating devices with powder storage containers can also be used as
  • the preparation here takes place exclusively mechanically, so that no different flow paths can be formed and in fact only the gun whose injector 40 is switched on is operated, with the hose 44 additionally being used acts as a conveyor brake.
  • the agitator shown appears to be extraordinarily simple, but can be replaced by other suitable agitating devices, for example with mechanical vibrators, planet-like rotating elements and the like.
  • the invention is not tied to either the cylindrical or the elongated design of the processing container. So you can in principle also use a short drum-shaped container that has evenly or unevenly distributed removal openings in the same or under different axis position on the circumference. The removal openings can be provided in the peripheral wall in the floor or in the ceiling of such a container. Under certain circumstances, a single stirring element can be used for the powder. loosen all gun connections.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)

Abstract

Un chariot (2) se deplacant sur le sol (1) comprend une colonne de support (3) sur laquelle sont fixes de facon reglable en hauteur un support (5) solidarise d'un recipient (6) et des pistolets de pulverisation (8) tenus par des bras (7). Le support (5) est relie a une source d'air comprime au moyen d'un tuyau flexible (11) et a une source de haute tension au moyen d'un cable collecteur (13) qui est branche avec chaque pistolet (8) au moyen d'un cable haute tension (14) passant par chaque bras creux (7). Chaque bras (7) est fixe par un mandrin (47) de facon mobile longitudinalement et pivotante au moins autour d'un axe. Le pistolet (8) est supporte par l'extremite libre du bras (7) de facon a pouvoir pivoter au moins autour d'un axe transversal, et est connecte avec l'un des plusieurs orifices (32) du recipient (6) au moyen d'un tube flexible (44) et d'un injecteur (40). Le recipient (6) comprend un agitateur et des moyens de traitement associes avec chaque orifice (32). Les pistolets (8) qui sont reglables independamment les uns des autres, peuvent etre enclenches et commandes chacun de facon independante au moyen des injecteurs (40) sans qu'une variation dans la pulverisation d'un pistolet ait une influence sur le pouvoir de pulverisation des autres pistolets.
EP81900716A 1980-04-10 1981-03-28 Dispositif pour revetir des pieces par projection de poudre dans un champ electrostatique Expired EP0049248B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81900716T ATE9966T1 (de) 1980-04-10 1981-03-28 Beschichtugsgeraet zum beschichten von werkstuecken durch aufspruhen von pulver im elektrostatischen feld.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803013777 DE3013777A1 (de) 1980-04-10 1980-04-10 Beschichtungsgeraet zum beschichten von werkstuecken durch aufspruehen von pulver im elektrostatischen feld
DE3013777 1980-04-10

Publications (2)

Publication Number Publication Date
EP0049248A1 true EP0049248A1 (fr) 1982-04-14
EP0049248B1 EP0049248B1 (fr) 1984-10-24

Family

ID=6099662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81900716A Expired EP0049248B1 (fr) 1980-04-10 1981-03-28 Dispositif pour revetir des pieces par projection de poudre dans un champ electrostatique

Country Status (3)

Country Link
EP (1) EP0049248B1 (fr)
DE (2) DE3013777A1 (fr)
WO (1) WO1981002854A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613083A (en) * 1984-06-21 1986-09-23 Nordson Corporation Adjustable powder spray gun
CA1334565C (fr) * 1988-05-26 1995-02-28 Honda Giken Kogyo Kabushiki Kaisha Methode et appareil d'enduction de pieces de travail
US5040732A (en) * 1990-07-12 1991-08-20 Brunswick Corporation Paint spray gun
DE19837879A1 (de) * 1998-08-20 2000-02-24 Erich Kraemer Traganordnung für mehrere, vertikal übereinander angeordnete Pulverauftragseinrichtungen
WO2002060595A1 (fr) * 2001-01-31 2002-08-08 Nordson Corporation Dispositifs de support et de nettoyage pour des pistolets pulverisant de la poudre

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463121A (en) * 1966-09-19 1969-08-26 Fischer & Co H G Spray gun
US3578486A (en) * 1967-10-09 1971-05-11 Fischer & Co H G Electrostatic coating material recovery device
DE2020055A1 (de) * 1970-04-24 1971-12-02 Mueller Ernst Kg Verfahren und Vorrichtung zum UEberziehen von Gegenstaenden mit pulverfoermigen Stoffen
FR2102466A5 (en) * 1970-08-05 1972-04-07 Flockage Ste Nouvelle Pneumatic flocking gun - with annular nozzle and electrode arranged concentrically in the nozzle
DE2101123A1 (de) * 1971-01-12 1972-08-03 Schaad H Pulversprühvorrichtung
US3724755A (en) * 1971-09-27 1973-04-03 Allis Chalmers Powder-air venturi for electrostatic spray coating system
FR2159182A1 (en) * 1971-11-08 1973-06-22 Tunzini Sames Pneumatic conveyor injector - for powder particularly for electrostatic coating
DE2306851C3 (de) * 1973-02-12 1979-06-28 Otto Duerr Anlagenbau Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zum Fördern von Fahrzeugkarosserien oder ähnlichen bemessenen Werkstücken zur Durchführung eines Beschichtens derselben
US3991710A (en) * 1973-06-01 1976-11-16 Energy Innovations, Inc. Electrogasdynamic production line coating system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8102854A1 *

Also Published As

Publication number Publication date
EP0049248B1 (fr) 1984-10-24
WO1981002854A1 (fr) 1981-10-15
DE3166777D1 (en) 1984-11-29
DE3013777A1 (de) 1982-02-11

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