EP0238031B1 - Dispositif de revêtement électrostatique d'objets - Google Patents

Dispositif de revêtement électrostatique d'objets Download PDF

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Publication number
EP0238031B1
EP0238031B1 EP87103818A EP87103818A EP0238031B1 EP 0238031 B1 EP0238031 B1 EP 0238031B1 EP 87103818 A EP87103818 A EP 87103818A EP 87103818 A EP87103818 A EP 87103818A EP 0238031 B1 EP0238031 B1 EP 0238031B1
Authority
EP
European Patent Office
Prior art keywords
electrodes
annular body
spraying
charging electrodes
face
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
EP87103818A
Other languages
German (de)
English (en)
Other versions
EP0238031A3 (en
EP0238031A2 (fr
Inventor
Hans Behr
Kurt Vetter
Rolf Schneider
Fred Luderer
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.)
Mahle Behr Industry GmbH and Co KG
Original Assignee
Behr Industrieanlagen GmbH and Co KG
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 Behr Industrieanlagen GmbH and Co KG filed Critical Behr Industrieanlagen GmbH and Co KG
Publication of EP0238031A2 publication Critical patent/EP0238031A2/fr
Publication of EP0238031A3 publication Critical patent/EP0238031A3/de
Application granted granted Critical
Publication of EP0238031B1 publication Critical patent/EP0238031B1/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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • Such a device for example for coating vehicle body shells, in which, in contrast to conventional systems, instead of the spray head, only one arrangement of external electrodes is placed at high voltage potential, is known to have significant advantages when using highly conductive spray materials, such as so-called water-based paints (see DE-OS 34 29 075). In particular, significant insulation problems are avoided, since the entire paint line system can be grounded up to the spray head.
  • the device known from DE-OS 34 29 075 is said to have only two, three or at most four charging electrodes which are embedded in a plastic holder projecting radially from the outer housing of the spray head and projecting axially in the direction of the object to be coated.
  • Each of these holders contains a high-voltage cable leading to its respective electrode and is firmly connected at the rear end to an annular body which is also made of plastic and is placed on the outer housing.
  • the invention has for its object to provide a coating device with external electrodes, which avoids contamination of the spraying device and the electrode holder arrangement as far as possible with good application efficiency.
  • a uniform spray pattern should preferably be ensured for the object to be coated.
  • the invention is based on the surprising finding that the problems resulting from the use of highly conductive coating materials (as described in the aforementioned DE-OS 34 29 075) can also be solved by distributing a relatively large number of charging electrodes around the spray head, if for sufficient mutual insulation of the electrode tips on the outside of the electrode holder is ensured. The insulation would be reduced by a substantial precipitation of the conductive coating material on the end face of the ring body forming the electrode holder, which would result in a sudden drop in the field strength at the electrode tips and thus a further increase in contamination.
  • the device shown contains a spray device in the form of a rotary atomizer 1 of the known bell type, the bell cup 2 forming the spray head of which can preferably be driven by an air turbine at high speed.
  • a line (not shown) that feeds the paint or other coating material from a storage system to the bell cup 2 runs along the axis of the spray device. With this line, which is formed, for example, by an earthed metal tube, the entire conductive coating material, such as water-based paint or the like, is at earth potential up to the spraying edge 6 of the bell cup 2.
  • the object to be coated (not shown), such as, for example, a part of a vehicle body, which is arranged at an axial distance in front of the bell plate 2, is also at earth potential.
  • the spray device can have an outer housing 7 made of an insulating plastic.
  • needle-shaped charging electrodes 10 are provided in the example shown on a circle concentric to the axis of the spraying device with a diameter of about 400 mm at uniform angular intervals.
  • the charging electrodes 10 are embedded axially parallel with their central main part in a circular ring body 20 made of insulating material, as can be seen in FIG. 1.
  • the front end (tip) of the electrodes is exposed in a depression 22 in the end face 21 of the ring body 20 facing the object to be coated.
  • the depression 22 opens outward at an angle that is more than 90 ° (for example about 120 °) should be, which among other things facilitates any cleaning of the electrode tips that may be required.
  • the rear ends of the charging electrodes 10 are connected in an electrically conductive manner to a conductor 12 made of wire or wire mesh that connects all electrodes to one another and which is to be completely enclosed in the interior of the ring body 20 for electrical insulation.
  • the ring body 20 is fastened by two spokes 24, which are also made of insulating material and which protrude radially from an insulating material ring 26 placed on the outer housing 7, but preferably obliquely inclined in the direction of the object to be coated. Different shaped and arranged spokes can also be provided.
  • the ring body 20, the spokes 24 and the ring 26 can be formed in one piece or connected to one another.
  • a clamping screw 29 can be used for fastening to the outer housing 7.
  • a high-voltage cable 14 leads through an outer connecting part 28, the ring 26 and one of the tubular spokes 24 and is connected to the conductor 12 connecting the charging electrodes 10 via a contact arrangement 16 provided at the (in FIG. 1 upper) end of the memory 24.
  • the high voltage potential thus applied to the electrodes can be, for example, 60 to 80 kV or more.
  • the contact arrangement 16 can e.g. contain a compression spring 17 and a screwed against the conductor 12 contact pin 18.
  • An advantage of the device described here is therefore that only a single high-voltage cable is required for the electrical connection of the outer electrodes, while in the known device with electrodes located in their own holders, each of them has a separate cable which leads to the outside of the holder each other cables must be coupled together at a connection point.
  • the number of charging electrodes 10 is of course not limited to the example chosen here, but should be chosen so that there is a sufficiently small distance between the electrodes to avoid a risk of contamination from the coating material on the front end face of the ring body 20.
  • a pitch circle diameter of the electrodes of 400 mm between about 18 and 30 electrodes should be used.
  • significantly fewer charging electrodes one would have a significant, i.e. determine the electrodes outside the insulating ring body 20, the coating of the end face 21, with the sequence explained at the beginning, of increasing contamination of the coating device, while more than 30 electrodes in this example would only increase the structural effort without any significant improvement in the electrical field.
  • you choose a smaller or larger pitch circle diameter for the electrodes their possible minimum number must be reduced or enlarged accordingly.
  • the distance between the electrode tips should accordingly be between approximately 40 and 70 mm.
  • the radially measured distance of the electrode tips from the spray edge 6, as in the known device, should be greater than twice the diameter (here approximately 70 mm) of the spray edge.
  • a currently preferred range of possible pitch circle diameters of the electrodes 10 is approximately 350 to 450 mm.
  • the axial position of the electrode tips with respect to the plane of the spraying edge 6 is also important for the risk of contamination.
  • the electrode tips are to be set back a certain distance behind the spraying edge 6 in the axial direction. This distance is chosen so that there is a usable compromise between the charging of the sprayed coating material, which becomes better as the distance decreases, and an increasing pollution, in particular of the bell cup 2 and the atomizer or its housing.
  • there are axially measured distances between 25 and 60 mm and preferably about 50 mm have been found to be useful.
  • the front ends of the charging electrodes should be set back axially by less than 1/3 of the distance of the electrode tips, measured in the radial direction, from the spraying edge 6 behind the plane of the spraying edge.
  • an electrically conductive connection between the charging electrodes outside the ring body 20 forming their holder is to be avoided by coating with conductive material (water charge).
  • conductive material water charge
  • a first additional measure is to increase the "leakage current" or surface path between the electrode tips.
  • longer needle-shaped electrodes 10 ' can be embedded in, or in any case enclosed, in a pin 31 of insulating material projecting finger-like from the end face 21' of the ring body 20 'axially towards the object to be coated.
  • These pins 31 can expediently be inserted with their rear ends into the ring body 20 'or can also be molded on.
  • the electrodes 10 ' are exposed with their front end in a depression similar to the depression 22 in the front pin end, while at the rear end they are connected to a connecting conductor 12' as in the exemplary embodiment according to FIG. 1.
  • FIGS. 4 and 5 Another additional measure consists, according to FIGS. 4 and 5, in the interior of the ring body 20 "in addition to the connecting conductor to form an annular fluid channel 35 which is under fluid pressure and from which axially opening fluid openings 36 extend outwards to the end face 21" of the ring body 20 " lead the charging electrodes 10 ".
  • the fluid, preferably air, flowing out of the openings 36 keeps the coating material away from the end face.
  • the connection of the fluid channel 35 to an external compressed air or other fluid source indicated by arrow 37 in FIG. 1 can lead through one of the spokes 24, expediently through the one in which the high-voltage cable 14 is not located.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (10)

1. Dispositif pour le recouvrement, par voie électrostatique, d'objets avec un matériau électriquement conducteur, comportant un dispositif de pulvérisation, en particulier un pulvérisateur rotatif ; comportant un boîtier extérieur maintenant la tête de pulvérisation ; comportant un conduit amenant le matériau de recouvrement, depuis un système de réserve jusqu'à un bord de pulvérisation de la tête de pulvérisation, lequel conduit est mis à la terre avec le matériau, jusque dans la tête de pulvérisation ; comportant des électrodes de charge en forme d'aiguilles, réparties radialement autour de la tête de pulvérisation, sur un cercle concentrique à l'axe de la tête de pulvérisation, régulièrement espacées les unes des autres d'une distance angulaire et qui sont raccordées à une source de haute tension pour charger le matériau de recouvrement et pour produire un champ électrique, la distance radiale séparant les extrémités avant des électrodes de charge, tournées vers l'objet à recouvrir, du bord de pulvérisation, étant supérieure à deux fois le diamètre du bord de pulvérisation; et comportant un agencement d'électrodes en matériau isolant dans lequel les électrodes de charge sont intégrées, à l'exception de leurs extrémités avant, et qui possède au moins un appui, faisant saillie radialement du boîtier extérieur de la tête de pulvérisation, caractérisé en ce que les électrodes de charge (10) sont insérées dans un corps annulaire (20) en matériau isolant, entourant le boîtier extérieur (7) de la tête de pulvérisation, à une certaine distance de celui-ci, dans lequel un conducteur électrique (12) reliant entre elles les électrodes de charge (10), en anneau, raccordé à la ligne haute tension (14), est isolé par rapport à la face frontale (21) du corps annulaire (20), tournée vers l'objet à recouvrir, et en ce que la disposition et l'écartement des électrodes de charge (10) sont choisis de telle sorte que, pendant le fonctionnement, il ne se produise pas de dépôt important du matériau de recouvrement sur la face frontale (21) du corps annulaire (20).
2. Dispositif selon la revendication 1, caractérisé en ce que pour un diamètre du cercle sur lequel reposent les extrémités des électrodes, supérieur à 200 mm, on prévoit au moins neuf électrodes de charge (10).
3. Dispositif selon la revendication 2, caractérisé en ce que pour un diamètre de cercle d'environ 400 mm ou plus, on prévoit au moins dix-huit électrodes de charge (10).
4. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le corps annulaire isolant (20) est en polypropylène (PP).
5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les extrémités avant des électrodes reposent librement dans un creux (22) dont l'angle d'ouverture est supérieur à 90°.
6. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'on prévoit, sur la face frontale (21') du corps annulaire (20'), des moyens (31) pour augmenter nettement le parcours de surface entre les extrémités avant libre des électrodes de charge (10').
7. Dispositif selon la revendication 6, caractérisé en ce que les électrodes (10') sont placées dans des broches (31) en matériau isolant, faisant saillie axialement, à la manière de doigts, de la face frontale (21') du corps annulaire (20').
8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le corps annulaire (12") comporte des moyens (36), destinés à empêcher un dépôt du matériau de recouvrement sur sa face frontale (21 ").
9. Dispositif selon la revendication 8, caractérisé en ce que le corps annulaire (12") contient un conduit de fluide (35), soumis à la pression du fluide, duquel des ouvertures débouchent axialement dans la face frontale (21"), entre les électrodes (10").
10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les extrémités avant des électrodes de charge (10) sont axialement en retrait, de moins de 1/3 de la distance radiale séparant les électrodes (10) du bord de pulvérisation (6), derrière le plan de ce dernier.
EP87103818A 1986-03-19 1987-03-17 Dispositif de revêtement électrostatique d'objets Expired - Lifetime EP0238031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3609240A DE3609240C2 (de) 1986-03-19 1986-03-19 Vorrichtung zum elektrostatischen Beschichten von Gegenständen
DE3609240 1986-03-19

Publications (3)

Publication Number Publication Date
EP0238031A2 EP0238031A2 (fr) 1987-09-23
EP0238031A3 EP0238031A3 (en) 1988-09-14
EP0238031B1 true EP0238031B1 (fr) 1990-10-03

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ID=6296766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103818A Expired - Lifetime EP0238031B1 (fr) 1986-03-19 1987-03-17 Dispositif de revêtement électrostatique d'objets

Country Status (9)

Country Link
US (2) US4852810A (fr)
EP (1) EP0238031B1 (fr)
JP (1) JPH0755299B2 (fr)
CA (1) CA1282951C (fr)
DD (1) DD255482A5 (fr)
DE (2) DE3609240C2 (fr)
ES (1) ES2017947B3 (fr)
FI (1) FI84027C (fr)
HU (1) HU194507B (fr)

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US7328123B2 (en) 2002-09-30 2008-02-05 Durr Systems, Inc. System for collision avoidance of rotary atomizer
US7347649B2 (en) 2002-07-11 2008-03-25 Durr Systems, Inc. Powder purge tube

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Publication number Priority date Publication date Assignee Title
US6896735B2 (en) 2002-01-24 2005-05-24 Behr Systems, Inc. Integrated charge ring
US7347649B2 (en) 2002-07-11 2008-03-25 Durr Systems, Inc. Powder purge tube
US7328123B2 (en) 2002-09-30 2008-02-05 Durr Systems, Inc. System for collision avoidance of rotary atomizer

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Publication number Publication date
US4872616A (en) 1989-10-10
DE3609240A1 (de) 1987-09-24
DE3609240C2 (de) 1996-08-01
FI871205A (fi) 1987-09-20
HUT43277A (en) 1987-10-28
EP0238031A3 (en) 1988-09-14
FI84027B (fi) 1991-06-28
DE3765274D1 (de) 1990-11-08
US4852810A (en) 1989-08-01
CA1282951C (fr) 1991-04-16
JPH0755299B2 (ja) 1995-06-14
JPS62277171A (ja) 1987-12-02
EP0238031A2 (fr) 1987-09-23
DD255482A5 (de) 1988-04-06
HU194507B (en) 1988-02-29
ES2017947B3 (es) 1991-03-16
FI871205A0 (fi) 1987-03-19
FI84027C (fi) 1991-10-10

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