EP0455110B1 - Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur - Google Patents

Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur Download PDF

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Publication number
EP0455110B1
EP0455110B1 EP91106543A EP91106543A EP0455110B1 EP 0455110 B1 EP0455110 B1 EP 0455110B1 EP 91106543 A EP91106543 A EP 91106543A EP 91106543 A EP91106543 A EP 91106543A EP 0455110 B1 EP0455110 B1 EP 0455110B1
Authority
EP
European Patent Office
Prior art keywords
filling
tube
filling piston
installation
coating
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.)
Expired - Lifetime
Application number
EP91106543A
Other languages
German (de)
English (en)
Other versions
EP0455110A1 (fr
Inventor
Günther Dipl.-Ing. Birner
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.)
Duerr GmbH
Original Assignee
Duerr GmbH
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 Duerr GmbH filed Critical Duerr GmbH
Publication of EP0455110A1 publication Critical patent/EP0455110A1/fr
Application granted granted Critical
Publication of EP0455110B1 publication Critical patent/EP0455110B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • B05B5/1641—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom an additional container being provided downstream the intermediate container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump

Definitions

  • the invention relates to a system according to the preamble of claim 1.
  • the spray head of rotary atomizers or the like is connected to high voltage in order to thereby generate the field which charges the sprayed coating particles between the spray head and the grounded object to be coated.
  • a coating material with high electrical conductivity such as the environmentally friendly water-soluble paints
  • the insulation resistance via the line connecting the spray head to the paint supply system is too low if the supply system is at ground potential.
  • the supply system which usually consists of ring lines for the individual colors, is to be grounded, since otherwise not only would considerable expenditure of insulation be necessary, but also the danger of explosive discharges would exist due to the large electrical capacity.
  • a separate storage container for each color, which is arranged insulated from earth and from the other containers and via a color changer and a connecting line which is at high voltage potential horizontal spray device feeds.
  • the connecting line is flushed with a given color and before changing to another color with solvent (water) and dried with compressed air in order to maintain the required insulation for the container which is subsequently connected to the spraying device.
  • solvent water
  • this system is structurally complex and bulky. There are also color losses when emptying and flushing the insulating lines and the need to dispose of the flushing agent.
  • the same problem occurs with a method known from DE-A-37 17 929, in which the color changer of an earthed supply system leads to an intermediate container and from there leads to the spraying device for electrical insulation and is dried.
  • the invention has for its object to provide a simple system that requires little space and little construction and tax.
  • the invention has the advantage that the movable intermediate container can be moved up and down between its end positions more easily and more quickly. It is also advantageous to close the movement range of the intermediate container to the outside by means of an insulating tube, which does not increase the space requirement. It is also important that the high voltage does not have to be switched off during the coating operation, since the coating device is always isolated from the supply system during operation.
  • the part of the system shown consists essentially of an intermediate container arrangement, which is accommodated in its entirety in its elongated closed and pressure-resistant tube 1, which is made of insulating material such as. B. acrylic glass is formed.
  • the tube 1 can have a circular cylindrical or any other cross-section and be set up with a vertical longitudinal axis or be mounted on a wall, for example a spray booth.
  • the tube 1 In its lower part, the tube 1 forms a storage container 3. At the lower end of the tube, that is to say in the bottom of the storage container 3, which lowers in a funnel-like manner or in some other way to a deepest point, the tube 1 has a closable outlet 4 for this at this point coating material located in the reservoir 3.
  • the outlet 4 can contain a valve and is connected to a line 5 leading to a coating device (not shown).
  • a return line 6 leading into the storage container 3 can branch off from the line 5. Since the content of the storage container 3 is electrically connected to the coating device by the conductive coating material, it is constantly at high voltage during operation like this.
  • the reservoir 3 is closed at the top by a horizontal partition 7 which contains an axial opening 8 forming the container inlet.
  • the part of the tube interior lying above the dividing wall 7 contains a filling piston 10 which is slidably displaceable vertically on the inside wall of the tube and which serves to fill the storage container 3.
  • the filling piston 10 can consist of an open-topped cylindrical container of the shape shown made of insulating material.
  • Its side wall 11 is located at a short distance parallel to the cylindrical inner wall of the tube 1 and has at the upper edge and on the piston head 12 each a radially projecting guide flange 14 or 15 lying airtight against the inner wall of the tube abuts the upper edge of its side wall 11 on a horizontal cover closing the tube 1 and can be filled through an inlet 18 of the cover, and a lower position in which the piston crown 12 rests on the partition 7 and the filling piston 10 in the reservoir 3 is emptied.
  • the filling piston 10 has an outlet valve 20 which is automatically opened by external control when the emptying position is reached.
  • the outlet valve 20 may have a downward actuating pin 21, which is pushed upwards to open the valve by an upward projection on the top of the partition 7, whereupon the coating material by gravity from the filling piston 10 through the inlet opening 8 in the reservoir 3 can flow.
  • a compressed air inlet 23 leads into the tube 1, which opens into a recess at the upper side edge of the partition 7, that is to say directly below the underside of the filling piston 10 seated on the partition 7 and serving as the piston surface.
  • the compressed air inlet 23 is connected to a compressed air line 25 via a valve 24.
  • the upper sensor 28 responds as soon as the liquid level in the storage container 3 reaches the desired maximum level, while the lower sensor 29 when the desired minimum level is undershot appeals.
  • sensors 30, 31 and 32 are attached to the tube wall one above the other, which sensors may consist of initiators known per se and respond when the filling piston 10 approaches.
  • the upper sensor 30 responds when the filling piston 10 reaches its upper end position.
  • the sensor 31 attached somewhat below the sensor 30 responds when the filling piston 10 is somewhat out of its upper end position has sunk down.
  • the sensor 32 attached further below in the vicinity of the partition 7 responds when the filling piston is seated on the partition 7.
  • the sensors 28 to 32 control (via the control lines shown in dashed lines) the compressed air valve 24 and a filling valve 35 which is connected to a line 36 of the earthed supply system leading to the inlet 18 of the pipe 1 or could also be installed in the inlet 18.
  • a timer 33 can be connected downstream of the sensor 32.
  • the sensor 30 responsive to this position opens the filling valve 35 so that the filling piston 10 is filled through the opening 18.
  • the cover 17 there is also a vent valve 38.
  • the filling piston begins to drop after a short time due to its increasing mass. It is full when it reaches the sensor 31, which then closes the filling valve 35 and can also switch off the compressed air at the valve 24 or reduce the pressure.
  • the full filling piston 10 drops again to the partition 7 and empties into the reservoir 3. After a z. B. by the timer 33 determined delay time, the process is repeated until the sensor 28 reports reaching a maximum level that should not be exceeded.
  • the storage container 3 can be emptied non-stop even during the filling processes described above and its contents remain constantly at the high-voltage potential of the spraying device to which it is connected via the conductive coating material in the line 5. Due to the distance of the above-mentioned maximum filling level in the container 3 from the grounded supply system on the top of the tube 1, which is dimensioned sufficiently larger than the flashover distance of the high voltage, the parts of the system which are at different potentials are constantly isolated from one another.
  • the arrangement described requires little construction effort and can be realized in a compact and space-saving manner, which is of particular interest in the case of a large number of selectable coating materials of different colors, for each of which an insulating container arrangement of the type described is required.
  • a relatively small filling piston for a content of approximately 1 l and a correspondingly dimensioned tube 1 with a diameter of approximately 15 cm may be sufficient.
  • the tubes 1 corresponding to the different colors can be assembled in a common unit.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (9)

  1. Installation permettant de recouvrir en série des pièces avec un matériau de revêtement électriquement conducteur comportant
       un système d'alimentation (36) à bas potentiel ou potentiel de terre,
       un dispositif de recouvrement sous haute tension en fonctionnement
       et un réservoir intermédiaire (10) pouvant monter et descendre entre deux positions,
       auquel, dans une première position, le matériau de revêtement est envoyé à partir d'une sortie du système d'alimentation (36),
       et qui, dans sa seconde position, dans laquelle son contenu est électriquement isolé de la sortie du système d'alimentation (36), distribue le matériau de revêtement dans un réservoir (3) relié au dispositif de recouvrement,
    caractérisé en ce que
    le réservoir intermédiaire (10), pouvant monter et descendre, est monté dans un tube (1) fermé et est conçu à la manière d'un piston de remplissage (10) qui peut être relevé par un fluide sous pression envoyé dans le tube (1).
  2. Installation selon la revendication 1, caractérisée en ce que le fluide sous pression est de l'air comprimé qui est envoyé dans le tube (1) par une entrée (23) débouchant sous la face inférieure du piston de remplissage (10) se trouvant dans sa position de fin de course basse.
  3. Installation selon les revendications 1 ou 2, caractérisée en ce que le réservoir (3), dans une partie du tube (1) contenant le piston de remplissage (10), est coaxial à celui-ci au-dessous d'une cloison (7) horizontale sur laquelle repose le piston de remplissage (10) dans sa position de fin de course basse, et contient une ouverture de passage (8) pour le matériau de revêtement.
  4. Installation selon la revendication 3, caractérisée en ce que dans le fond du piston de remplissage (10) se trouve une soupape d'évacuation (20) qui s'ouvre automatiquement dans l'ouverture de passage (8), lorsque le piston de remplissage (10) vient en appui.
  5. Installation selon les revendications 3 ou 4, caractérisée en ce que sur la paroi du tube (1) sont placés des capteurs (28 à 32) qui réagissent à des niveaux maximaux et/ou minimaux du matériau de revêtement dans le réservoir (3) et/ou à la position verticale du piston de remplissage (10).
  6. Installation selon la revendication 5, caractérisée en ce que sur le réservoir (3) sont prévus un capteur (28) pour le niveau maximal et un capteur (29) pour le niveau minimal et à l'extrémité supérieure du tube (1), deux capteurs (30, 31) dont un capteur (30) réagit lorsqu'est atteinte la position de fin de course haute du piston de remplissage (10), tandis que l'autre capteur (31) réagit lorsque le piston de remplissage (10) est abaissé d'une distance nettement inférieure à sa course totale, à partir de sa position de fin de course haute.
  7. Installation selon les revendications 5 ou 6, caractérisée en ce que les capteurs (28 à 32) commandent une soupape d'air comprimé (24) montée en amont de l'entrée d'air comprimé (24) et/ou une soupape de remplissage (35) du système d'alimentation, montée en amont de l'entrée de matériau (18) du tube (1).
  8. Installation selon l'une des revendications précédentes, caractérisée en ce que le piston de remplissage (10) est un réservoir cylindrique ouvert à sa partie supérieure et le tube (1) est fermé à son extrémité supérieure par un couvercle.
  9. Installation selon l'une des revendications précédentes, caractérisée en ce que le réservoir (3) est résistant à la pression et peut être vidangé par alimentation en pression du réservoir.
EP91106543A 1990-04-30 1991-04-23 Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur Expired - Lifetime EP0455110B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4013942A DE4013942A1 (de) 1990-04-30 1990-04-30 Anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
DE4013942 1990-04-30

Publications (2)

Publication Number Publication Date
EP0455110A1 EP0455110A1 (fr) 1991-11-06
EP0455110B1 true EP0455110B1 (fr) 1993-12-15

Family

ID=6405492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106543A Expired - Lifetime EP0455110B1 (fr) 1990-04-30 1991-04-23 Installation pour revêtir en série des pièces d'oeuvre d'un matériau de revêtement conducteur

Country Status (2)

Country Link
EP (1) EP0455110B1 (fr)
DE (2) DE4013942A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2282085A (en) * 1993-08-18 1995-03-29 John Stephen Griffiths Paint supply apparatus
US5364035A (en) * 1993-12-20 1994-11-15 Graco Inc. High voltage sealing and isolation via dynamic seals
DE4444671A1 (de) * 1994-12-15 1996-06-20 Abb Patent Gmbh Lackförderpumpe
DE19610589A1 (de) * 1996-03-18 1997-09-25 Duerr Gmbh & Co Verfahren und System zur Farbversorgung einer Beschichtungsanlage
US8020784B2 (en) 2005-10-07 2011-09-20 Durr Systems Inc. Coating material supply installation and associated operating procedure
EP1772194B1 (fr) 2005-10-07 2019-01-09 Dürr Systems AG Dispositif d'alimentation pour un agent de revêtement et correspondant procédé de fonctionnement
CN108043629A (zh) * 2018-01-30 2018-05-18 浙江夏远信息技术有限公司 一种环保喷漆设备
CN108043648B (zh) * 2018-01-30 2019-01-11 嘉兴敏惠汽车零部件有限公司 一种环保喷漆装置
CN108043636A (zh) * 2018-01-30 2018-05-18 浙江夏远信息技术有限公司 一种环保安全喷漆装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL187613C (nl) * 1978-01-11 1991-12-02 Akzo Nv Inrichting voor het elektrostatisch verspuiten van elektrisch geleidende lak.
US4232055A (en) * 1979-04-24 1980-11-04 Champion Spark Plug Company Automatic color change electrostatic paint spray system
US4287756A (en) * 1979-10-24 1981-09-08 Gallagher John J Stratified fluid interface recorder
GB8412460D0 (en) * 1984-05-16 1984-06-20 Schlumberger Electronics Uk Fluid level measurement
DE3440381A1 (de) * 1984-11-05 1986-05-07 Ransburg Gmbh, 6056 Heusenstamm Verfahren und vorrichtung zum automatischen elektrostatischen spruehbeschichten
DE3725172A1 (de) * 1987-05-27 1989-02-09 Behr Industrieanlagen Verfahren und anlage zum elektrostatischen beschichten mit leitfaehigem material
DE3717929A1 (de) * 1987-05-27 1988-12-08 Behr Industrieanlagen Verfahren und anlage zum elektrostatischen beschichten mit leitfaehigem material

Also Published As

Publication number Publication date
EP0455110A1 (fr) 1991-11-06
DE4013942A1 (de) 1991-10-31
DE59100712D1 (de) 1994-01-27

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