EP1362640A1 - Dispositif pulvérisateur pour le revêtement électrostatique de pièces en séries - Google Patents

Dispositif pulvérisateur pour le revêtement électrostatique de pièces en séries Download PDF

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Publication number
EP1362640A1
EP1362640A1 EP03000734A EP03000734A EP1362640A1 EP 1362640 A1 EP1362640 A1 EP 1362640A1 EP 03000734 A EP03000734 A EP 03000734A EP 03000734 A EP03000734 A EP 03000734A EP 1362640 A1 EP1362640 A1 EP 1362640A1
Authority
EP
European Patent Office
Prior art keywords
atomizer
electrodes
outer housing
atomizer according
electrode
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
EP03000734A
Other languages
German (de)
English (en)
Other versions
EP1362640B1 (fr
Inventor
Stefano Giuliano
Peter Marquardt
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 Systems AG
Original Assignee
Duerr Systems AG
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 Systems AG filed Critical Duerr Systems AG
Publication of EP1362640A1 publication Critical patent/EP1362640A1/fr
Application granted granted Critical
Publication of EP1362640B1 publication Critical patent/EP1362640B1/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
    • B05B5/0403—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
    • B05B5/0407—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 with a spraying edge, e.g. like a cup or a bell
    • 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
    • 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

Definitions

  • the invention relates to an atomizer according to the preamble of claim 1.
  • it concerns high-speed rotary atomizers or possibly also air atomizers that are for the Series electrostatic coating of workpieces such as Vehicle bodies using the known Side and roof machines and painting robots are needed.
  • the invention is therefore based on the object, one for Coating systems with painting robots suitable if possible specify small electrostatic atomizer that is simple Way, in particular without frequent cleaning work enables a better application efficiency than before.
  • the electrodes are therefore not finger-like projections, like cones projecting holder or spoke-like supports provided. Instead of the usual electrode holder, the charging electrodes are with no gap or outer distance between their ionization ends and the outside of the atomizer housing directly integrated in or on the housing.
  • the inclination of the atomizer is surprising by the invention reduced for self-coating of the electrode tips and accordingly both the application efficiency as well improves the service life of the atomizers in operation.
  • On possible reason for this is the closer proximity of the ionization ends the electrodes to the spray edge of the atomizer bell a rotary atomizer (or to the nozzle mouth other Atomizer) with the result that the sprayed paint particles quickly and reliably in an area of high field line concentration and charged accordingly strongly ionized air before moving further away from the spray head.
  • the density of the field lines at sharp edges and tips at largest, the chargeability of the paint particles increases with increasing Distance from electrodes and spray head.
  • the paint droplets will change according to their distance from the spray head increasingly drier, also due to the Spray jet steering from the atomizer onto the atomized coating material directed steering air, increasing the chargeability is reduced. According to the invention, however, it is possible the paint close to the spray head, so it’s still wet and therefore good rechargeable state with the highest possible field line concentration to supply.
  • a particular advantage of the invention is that good Application efficiency and low self-coating tendency due to a compact design without the usual housing protruding electrode holder can be reached.
  • This compact External shape is especially useful for electrostatic support Robot painting of difficult to access workpiece areas and in front all of the workpiece interiors cheap and relieved addition, both a manual or automated cleaning of the Atomizer as well as automatic change of atomizer or of his spray head in a corresponding exchange station. Further is due to the compact design and the low mass of the Atomizer whose dynamic mobility on a robot and other coating machines improved.
  • the invention is suitable for electrostatic high-speed rotary atomizers and for electrostatic supported air atomizer and still allows better than before a sensible alternative to the complex Potential burning systems for electrostatic coating with conductive coating material such.
  • the invention also results in a more uniform Spray pattern. At the same time increases with the possible number of charging electrodes because of the application efficiency Corona effect of many electrodes charged more air molecules who pass their charges on to the coating material.
  • the high-speed rotary atomizer shown schematically in FIG. 1 contains in its outer housing body 1 of the shown, in essential hollow cylindrical shape in a known and Usually, a turbine 2 driven with compressed air whose hollow shaft 3 is in front of the front end of the housing body 1 rotating bell plate 4 is mounted. Through the hollow shaft 3 As is known, the line runs in a color tube construction 5 for the coating material to the bell plate 4.
  • the housing body 1 On the rear end of the housing body 1 is a holding body 6 placed for a high voltage feeder, the the housing body 1 with its cylindrical ring part 61 concentrically encloses, and on its radially extending end wall 62 a high-voltage cable holder 63 in the axial direction outwards is scheduled.
  • annular body 8 On the side of the housing body facing the bell cup 4 1 sits on its peripheral surface adjacent to the holding body 6 an annular body 8, at the rear end of an approach 81 with evenly around the axis of rotation of the atomizer distributed bores is formed, which is axially parallel in the holding body 6 extends.
  • the housing body 1, the ring body 8 and the holding body 6 consist of insulating material, in particular the Body 1 and 6, but also the ring body 8 are made of PTFE can, because of its surface properties particularly little prone to pollution.
  • the bell plate 4 of an atomizer shown Type for direct charging at an appropriate high voltage potential let us assume that this is from his rotating edge of radially sprayed coating material is initially uncharged and by an electric field outside of the atomizer to be charged.
  • a ring in the ring body 8 from the axis of rotation a concentric circle with even angular distances surrounding needle electrodes 10 embedded in the illustrated Example with the front end of the atomizer and thus parallel to the workpieces to be coated lie to the axis of rotation. Instead, they could go against the direction of the axis of rotation is inclined or angled his.
  • the electrodes can expediently be embedded in such a way that the The ends of their tips are gapless (without sinking) flush with the it surrounding end face 82 or other surface of the insulating Ring part, so here are the ring body 8, so that the tips of the electrodes do not get dirty and the necessary ones Cleaning the surrounding surface areas of the ring body is not hindered.
  • One way to do this is in the ring body or its surface in the area of Electrode tips z. B. made of ceramic or another material with similarly high strength properties and with the tightly inserted electrodes, what without significantly affecting the electrostatic that can be generated Field at the needle tips is possible.
  • Another possibility is the arrangement of the needle tips in depressions surrounding insulating surface with an electrostatic Field not weakening mass poured out or possibly can be covered with a thin protective film.
  • the needle electrodes 10 can each be electrically connected via an in inserted the bore of the neck 81 of the ring body 8 Damping resistor 12 with a concentric to the axis of rotation circular ring conductor 14 are connected, the sits isolated in the holding body 6 and in turn over a or a plurality of further high-voltage conductors 15 arranged radially and an axial connector that one in the cable holder 63 located further resistor 16 may contain is connected to the high voltage cable 17.
  • the ring leader 14 connects all electrodes 10 to cable 17.
  • the usually consists of a compact cascade construction
  • High voltage generator does not have to be external Cables like 17 are connected to the electrode arrangement, but can also be built directly into or attached to the atomizer his. It is also possible for each electrode or for individual electrode groups each have their own high-voltage generator to provide, for example in the bore of the approach 81 similar recesses near the electrodes.
  • the radial distance between the tips of the needle electrodes can be seen 10 from the axis of rotation of the atomizer and thus from the spray edge 4 'of the bell cup 4 is significantly smaller than with currently comparable atomizers.
  • the radial one Distance of the electrode tips from the spray edge 4 ' smaller than their diameter in the example shown, in contrast e.g. to EP 0171042 and 0238031, after which it is larger should be as double the edge diameter.
  • the radial distance around the longitudinal axis of the Atomizer i.e. charging electrodes distributed around the central axis of the paint nozzle of the electrically conductive parts on the circumference of the spray head should be correspondingly low.
  • the Process security required control measures can a reliable grounding of the relevant components of the Atomizer may be important, these components such as the the coating material feeding the spray head and adjacent components expediently from bad electrical or non-conductive materials such as plastic or ceramic can.
  • the electrode arrangement is largely FIG. 1 corresponding atomizer with here, for example, twelve Electrode tips evenly distributed around the axis of rotation 102 in the end face 82 of the one placed on the housing body 1 ' Annular body 8 'spatially recognizable.
  • Fig. 2 is in the front opening of the housing body 1 'used steering air ring 20 with a ring around concentrically the axis of rotation of distributed air nozzles 21 can be seen.
  • the steering air ring has the well-known function of spraying into a desired one Bring shape and the sprayed coating material with an axial component in the direction of those to be coated Workpieces.
  • the steering air can a reason in particular with the known atomizers be for poorer charging as they are the sprayed off Paint particles dry and thus their chargeability increases Distance from the spray edge reduced.
  • the Paint droplets directly on the spray edge i.e. still in the largely "wet" condition due to the radial proximity of the electrode arrangement get into an area of high field line density and accordingly well by the particularly strongly ionized there Air are rechargeable.
  • the explained nozzle arrangements can also be fed with another suitable steering gas.
  • it can be useful to increase electrical Conductivity of the air molecules in the vicinity of the electrode tips from the described nozzle arrangement z.
  • air increased Moisture or a gas that increases conductivity blow and / or the escaping air to increase the conductivity Add gas.
  • corona ionization increasing gases is conceivable.
  • a conductive paint particle layer on the outside of the atomizer housing could lead bridges between the electrodes and grounded parts of the atomizer. Similar to an air or gas envelope surrounding the atomizer housing contamination of the housing can also be avoided by that the housing and preferably the entire outer surface of the Atomizer from a shell made of a porous air permeable Material is surrounded (cf. also the EP already mentioned at the beginning 0283918). Another possible measure against pollution or Self-coating of the outside of the atomizer exists therein, the surfaces of the housing and / or others therefor vulnerable outer parts from a material that the Has particularly low wettability property and / or static electrical charge in the sense of a low tendency to contamination affected. Among others from interface chemistry known materials or coatings prove for this purpose in particular with water-soluble colored lacquer z. B. materials with the known "lotus effect" accordingly microstructured surfaces as suitable (which also with PTFE can be realized).
  • FIG. 3 shows an embodiment modified from FIG. 2, in which the outer housing 30 with one at its front end axially projecting, e.g. B. integrally molded end ring 31st umbrella-like up to a rear part of the spray head extends, here the bell plate 34.
  • the bell plate 34 Through the end ring 31 is the bell plate 34, which, as usual, made of metal or other electrically conductive material can exist, so be shielded so that it does not directly touch the electrode tips 103 and an area facing the highest field line density.
  • the end ring 31 is therefore in the direct (straight line) connection path between the bell cup and the electrode tips. This measure makes it possible to remove the electrode tips to be arranged axially closer to the bell cup or spray head.
  • Fig. 3 shows that even an even greater number of electrode tips 103 is possible than in FIG. 2.
  • the outer housing 40 of the atomizer in its circumference axially elongated recesses 42 of the illustrated contain trough-like shape, in which on its rear Each end of the tip of one around the axis of rotation distributed needle electrodes 104 is exposed.
  • the trough shape the recesses should be as easy to clean as possible.
  • the with their tips in these recesses 42 recessed electrodes 104 can, for example, in a separate ring body as in Fig. 1 or instead directly into the outer housing 40 be embedded yourself.
  • the ring body or the outer housing form the radially extending, surrounding the electrode tips, So facing the workpieces to be coated End face regions 84 which define the trough-like recesses 42 limit at the end. Similar to Fig. 3 is also used here the bell plate 44 itself (in contrast to the sprayed Paint particles) from an axially projecting end ring 41 against shielded field line concentration too high.
  • FIG Atomizer of the invention corresponds in the rear part of the Atomizer and especially with regard to the high voltage supply device the embodiment of Fig. 1.
  • the needle electrodes However, 10 'does not sit in a separate manner as in FIG. 1 Ring body, but in a ring body 8 similar molded part 8 'of the outer housing body 1' itself as in Fig. 1 a rounded and stepless in the front peripheral part the end face 82 'of the housing body 1' forms.
  • the one in FIG illustrated embodiment in addition to the electrodes 10 'a second arrangement of concentric with them similar equal mutual angular distances around the axis of rotation distributed needle electrodes 105 are provided.
  • the needle electrodes 105 like that Electrodes 10 'as shown in a the peripheral wall of the Housing body 1 'self-forming ring part 8' 'or instead in a separate one placed on the housing body Ring body to be embedded.
  • the ionization ends of these additional The electrode arrangement is preferably radial Plane axially offset against the ends of the electrodes 10 ' lies between this and the bell plate 54, and her radial distance from the axis of rotation can, as shown be smaller than that of the ionization ends of the rear Electrodes 10 '.
  • the electrodes 105 are similar to the electrodes 10 'via damping resistors 56 to one in the ring part 8 '' ring conductor concentric with the axis of rotation 57 connected, which in turn in not shown Way is connected to a high voltage device.
  • Electrode arrangements can be improved control behavior reach because the (for the most part in the grounded Bell dish flowing) operating current is better divided.
  • it can in principle be similar to the known one combined internal and external charging (DE 4105116) the charging be improved, but preferably with grounded Bell plate, the front electrode ring with the needle electrodes 105 mainly for charging the coating material and the rear and outer electrode ring also for Steering and shielding of the spray jet should serve.
  • the two (or more) separate electrode assemblies of the type described each to its own high voltage generator connected and placed on different potentials, whereby usually the electrodes closer to the spray head lower potential. But it is also possible that two electrode arrangements to a common high voltage generator to join.

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  • Electrostatic Spraying Apparatus (AREA)
EP03000734A 2002-01-24 2003-01-13 Dispositif pulvérisateur pour le revêtement électrostatique de pièces en séries Expired - Lifetime EP1362640B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10202711A DE10202711A1 (de) 2002-01-24 2002-01-24 Zerstäuber für die elektrostatische Serienbeschichtung von Werkstücken
DE10202711 2002-01-24

Publications (2)

Publication Number Publication Date
EP1362640A1 true EP1362640A1 (fr) 2003-11-19
EP1362640B1 EP1362640B1 (fr) 2008-03-12

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EP03000734A Expired - Lifetime EP1362640B1 (fr) 2002-01-24 2003-01-13 Dispositif pulvérisateur pour le revêtement électrostatique de pièces en séries

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Country Link
US (1) US6896735B2 (fr)
EP (1) EP1362640B1 (fr)
DE (2) DE10202711A1 (fr)
ES (1) ES2302520T3 (fr)

Cited By (4)

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EP1510258A1 (fr) * 2003-08-25 2005-03-02 Illinois Tool Works Inc. Atomiseur avec passage à une zone a basse pression
EP1634651A1 (fr) 2004-09-13 2006-03-15 Dürr Systems GmbH Méthode et dispositif de revêtement de pièces en série et pulvérisateur rotatif
EP1849527A3 (fr) * 2006-04-28 2010-05-05 Dürr Systems GmbH Atomiseur et procédé de fonctionnement correspondant
DE102009013979A1 (de) 2009-03-19 2010-09-23 Dürr Systems GmbH Elektrodenanordnung für einen elektrostatischen Zerstäuber

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FR3103717B1 (fr) 2019-12-02 2022-07-01 Exel Ind Projecteur électrostatique rotatif de produit de revêtement, installation de projection comprenant un tel projecteur et procédé de revêtement au moyen d’un tel projecteur
FR3103718B1 (fr) 2019-12-02 2021-12-17 Exel Ind Projecteur électrostatique rotatif de produit de revêtement et installation de projection comprenant un tel projecteur
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DE50309356D1 (de) 2008-04-24
EP1362640B1 (fr) 2008-03-12
ES2302520T3 (es) 2008-07-16
US20040255849A1 (en) 2004-12-23
US6896735B2 (en) 2005-05-24
DE10202711A1 (de) 2003-07-31

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