EP1060795B1 - Commande pour un dispositif de revêtement par pulvérisation électrostatique - Google Patents

Commande pour un dispositif de revêtement par pulvérisation électrostatique Download PDF

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Publication number
EP1060795B1
EP1060795B1 EP00110032A EP00110032A EP1060795B1 EP 1060795 B1 EP1060795 B1 EP 1060795B1 EP 00110032 A EP00110032 A EP 00110032A EP 00110032 A EP00110032 A EP 00110032A EP 1060795 B1 EP1060795 B1 EP 1060795B1
Authority
EP
European Patent Office
Prior art keywords
voltage
spray
current
value
coating apparatus
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
EP00110032A
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German (de)
English (en)
Other versions
EP1060795A3 (fr
EP1060795A2 (fr
Inventor
Felix Mauchle
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland 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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP1060795A2 publication Critical patent/EP1060795A2/fr
Publication of EP1060795A3 publication Critical patent/EP1060795A3/fr
Application granted granted Critical
Publication of EP1060795B1 publication Critical patent/EP1060795B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to a spray coating device according to the preamble of claim 1.
  • a spray coating device of this kind is known from EP 0 734 778 A2 known.
  • a spray coating device in which an operator can enter via a keyboard a desired voltage value and a desired current value, which should be kept constant by a control device.
  • a threshold value is provided for the distance between the spray device and the object to be coated. If the distance is greater than the threshold value, then the high voltage at the high voltage electrode of the spraying device is kept constant independently of the object distance, whereby the spraying current of the high voltage electrode increases with increasing object distance becomes smaller or with decreasing object distance. If the distance is less than the threshold, then the spray current is kept constant independent of changes in distance by counteracting a current increase by a corresponding voltage reduction. Immediately before the object touches the spray device, the high voltage breaks down completely (contact protection).
  • Spray current from the electrode to the object to be coated is indirectly measured by measuring the electric current flowing through a primary winding of a transformer to the secondary winding of which a high voltage cascade circuit with rectifiers and capacitors is connected, which generates the high voltage DC voltage for the electrode.
  • a spray coating device in which an increase in the spray flow when an object to be coated approaches the spray device is counteracted by a corresponding reduction of the high voltage in order to keep the spray flow constant.
  • the spray current is measured indirectly by measuring the current flowing in the secondary winding between the transformer and a high voltage cascade circuit.
  • a spray coating device is known, in which also the input voltage of a high voltage generator is changed inversely to the spraying current, wherein the spraying current is measured indirectly at an electrical resistance upstream of the high voltage electrode by measuring a voltage drop.
  • the invention enables the problem to be solved to avoid the dangers of excessive electrical voltage to the high voltage electrode at a large distance of an electrically conductive object or too high a current or short-circuit current in close proximity of an object to the high voltage electrode, wherein the object be coated object or an operator or other object, and at the same time form the spray coating device such that optimum coating results are achieved with minimal electrical energy expenditure.
  • the invention is particularly advantageous in connection with a counter electrode which is connected to a potential which has a high electrical voltage difference to the high voltage potential of the high voltage electrode, e.g. B. is connected to ground potential to dissipate free electric particles, in particular ions and electrons, which emanate from the Hochspannunselektrode, but freely herumavagundieren, instead of with the spray coating material from the sprayer to the flying object.
  • Counter electrodes are z. B. from the EP 0 756 899 A2 known.
  • the spray coating device shown schematically in Fig. 1 comprises a spraying device 2 for spraying coating material 4 in the form of liquid or preferably powder on an object to be coated 6. It is assumed that the objects to be coated consist of electrically conductive material and connected to ground potential 8 are.
  • the objects 6 are transported in the case of automatic systems through a conveying device, not shown, past the spraying device 2 and thereby reach the spray jet of the coating material 4 schematically represented by an arrow.
  • the spray device 2 is provided with at least one high voltage electrode 10 for electrostatically charging the coating material 4, which is supplied by a high voltage DC voltage source 12 in the range between 1 kV and 150 kV, preferably one therebetween lying value, is supplied.
  • the high voltage generator may include, in a known manner, a transformer for stepping up a low AC voltage to a higher AC voltage and a cascade circuit which in a known manner contains a plurality of rectifiers and capacitors and converts the AC voltage to the DC high voltage.
  • the low alternating voltage is generated by an oscillator 14 in response to a control voltage U-ST, which is a manipulated variable for the high voltage of the high voltage electrode 10.
  • the oscillator 14 may be a part of the high voltage generator 12 and be integrated as such in the spray device 2, or according to FIG. 1 integrated into a control unit, which forms a total of a control device 16.
  • the control device 16 includes an operating parameter memory 18, which via a data transfer path 19 from a data input station, such as a higher-level computer or manually, z. B. via a keyboard, variably adjustable at least one high-voltage limiting value HV-BG and at least one Sprühstrombegrenzungswert I-BG each for the maximum achievable value at the high voltage electrode can be entered and stored therein.
  • a data input station such as a higher-level computer or manually, z. B. via a keyboard
  • variably adjustable at least one high-voltage limiting value HV-BG and at least one Sprühstrombegrenzungswert I-BG each for the maximum achievable value at the high voltage electrode can be entered and stored therein.
  • a plurality of such values can be stored for different operating situations, in particular for different objects to be coated and different spray coating materials.
  • the stored values may be non-settable fixed values in another embodiment.
  • the high voltage limit value HV-BG is input from the operating parameter memory 18 into a high voltage limiting circuit 20.
  • the spray current limit value I-BG is input from the operating parameter memory 18 to a spray current controller 22.
  • the spraying current of the high-voltage electrode 10 flowing from an object 6 to be coated to earth is measured by a spray current circuit 24 on the side of the objects 6 connected to ground 8 and also input into the spray current regulator as the actual spray current value I-S.
  • the spray current controller 22 compares the actual spray current value 1-S- with the spray current limit value I-BG and, in response thereto, generates a high-voltage regulator quantity U-RG which is given by the spray current regulator 22 to the high voltage limit circuit 20.
  • the spray current controller 22 is preferably a P-I controller (proportional-integral controller).
  • the high voltage limiting circuit 20 generates depending on the Hochgêtsbegrenzungswert HV-BG and the high-voltage regulator size U-RG the control voltage U-ST, which is supplied to the oscillator 14 in the form of a DC input voltage and the manipulated variable for the high voltage of the high voltage electrode 10.
  • FIG. 2 shows the spray current in ⁇ A on the horizontal axis and the corresponding high voltage in kV on the vertical axis.
  • the top characteristic 26 with filled squares is a standard characteristic. It shows how in known devices with decreasing distance between the high voltage electrode 10 and an object to be coated 6, the spray current of the high voltage electrode 10 increases and at the same time the high voltage drops.
  • the high voltage has its maximum value at the greatest possible distance or infinitely large distance of the object 6 to be coated or another electrically conductive object from the high-voltage electrode 10.
  • the middle curve 27 with the non-filled squares relates to an embodiment in which the maximum DC high voltage of the high voltage electrode 10 is limited to a maximum value HV-BG of 80 kV, but no current limiting I-BG was made.
  • the spraying device 2 is shown in somewhat more detail. It shows that one or more high voltage electrodes 10 may be disposed outside or within a coating material channel 30. He is coating material, for. As coating powder, via a line 31, z. B. a hose supplied.
  • the spray device 2 with a reference potential, z. Ground potential, connected counterelectrodes 32 (arrester electrodes) may be provided, which absorb free electric charges (ions, electrons), which are discharged from the electrodes 10, and divert them to earth potential. It has been found that substantially less free electrical particles are formed by the invention, in particular free ions, and thus also a lower power loss.
  • the oscillator 14 is connected via an electrical cable 36 to the high voltage generator 12, which is integrated into the spray device 2, but also separated from it, z. B. in the control device 16 could be arranged.

Claims (6)

  1. Dispositif de revêtement par pulvérisation pour pulvériser une matière de revêtement sur des objets à revêtir au moyen d'un dispositif de pulvérisation (2), qui comprend au moins une électrode à haute tension (10) pour charger électriquement la matière de revêtement au moyen de la haute tension d'une génératrice haute tension (12); dans lequel le dispositif de revêtement par pulvérisation comprend: un dispositif de régulation (16) pour la régulation d'un courant électrique de pulvérisation, qui circule avec la matière de revêtement de l'électrode à haute tension (10) vers un objet à revêtir (6), un circuit de mesure du courant de pulvérisation (24) dans le trajet du courant électrique de retour de l'objet à revêtir (6) au dispositif de régulation (16), pour mesurer automatiquement le courant de pulvérisation dans le trajet du courant de retour et s'opposer à une augmentation du courant par une réduction de tension au moyen du dispositif de régulation en fonction de celui-ci, et des moyens (18, 20, 22) pour limiter le courant et limiter la haute tension à une valeur respective prédéterminée, caractérisé en ce que les moyens (18, 20, 22) comprennent un régulateur de courant de pulvérisation (22) et un circuit de limitation de la haute tension (20), parmi lesquels le régulateur de courant de pulvérisation (22) compare la valeur réelle du courant de pulvérisation I-S avec une valeur de limitation du courant de pulvérisation I-BG prédéterminée dans celui-ci et envoie une grandeur de régulation de la haute tension U-RG au circuit de limitation de la haute tension (20) en fonction du résultat de cette comparaison, et parmi lesquels le circuit de limitation de la haute tension (20) produit une tension de commande U-ST en fonction de la grandeur de régulation de la haute tension U-RG et en fonction d'une valeur de limitation de la haute tension HV-BG prédéterminée dans celui-ci, cette tension de commande étant une grandeur de réglage pour la haute tension de l'électrode à haute tension (10), dans lequel le circuit de limitation de la haute tension (20) est conçu de façon à assurer que, dans le cas où la grandeur de régulation de la haute tension U-RG est supérieure ou égale à la valeur de limitation de la haute tension HV-BG, la valeur de tension de la tension de commande U-ST soit égale à la valeur de limitation de la haute tension HV-BG, et à assurer en outre que, dans tous les cas où la grandeur de régulation de la haute tension U-RG est inférieure à la valeur de limitation de la haute tension HV-BG, la tension de commande U-ST soit égale à la grandeur de régulation de la haute tension U-RG.
  2. Dispositif de revêtement par pulvérisation selon la revendication 1, caractérisé en ce que le trajet du courant de retour est raccordé au potentiel de la terre (8).
  3. Dispositif de revêtement par pulvérisation selon la revendication 1 ou 2, caractérisé en ce que la valeur de limitation du courant et/ou la valeur de limitation de la haute tension sont réglables de façon variable.
  4. Dispositif de revêtement par pulvérisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu une mémoire (18) pour mémoriser respectivement au moins une valeur de limitation du courant (I-BG) et une valeur de limitation de la haute tension (HV-BG), la valeur étant réglable de façon variable.
  5. Dispositif de revêtement par pulvérisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu un oscillateur (14), qui produit en fonction de la tension de commande U-ST une basse tension alternative, à partir de laquelle la génératrice haute tension (12) produit la haute tension.
  6. Dispositif de revêtement par pulvérisation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu sur le dispositif de pulvérisation (2) au moins une contre-électrode (32), qui est raccordée à un potentiel s'écartant fortement du potentiel électrique de l'électrode à haute tension (10), à distance de l'électrode à haute tension (10) à l'extérieur du courant de matière de revêtement afin de dévier les ions libres et les électrons libres, qui sont produits par l'électrode à haute tension (10), mais qui n'accompagnent pas la matière de revêtement sur l'objet à revêtir.
EP00110032A 1999-06-14 2000-05-12 Commande pour un dispositif de revêtement par pulvérisation électrostatique Expired - Lifetime EP1060795B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19926926A DE19926926A1 (de) 1999-06-14 1999-06-14 Sprühbeschichtungseinrichtung
DE19926926 1999-06-14

Publications (3)

Publication Number Publication Date
EP1060795A2 EP1060795A2 (fr) 2000-12-20
EP1060795A3 EP1060795A3 (fr) 2003-05-21
EP1060795B1 true EP1060795B1 (fr) 2007-11-07

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EP00110032A Expired - Lifetime EP1060795B1 (fr) 1999-06-14 2000-05-12 Commande pour un dispositif de revêtement par pulvérisation électrostatique

Country Status (8)

Country Link
US (2) US6537378B1 (fr)
EP (1) EP1060795B1 (fr)
JP (1) JP4638976B2 (fr)
AT (1) ATE377453T1 (fr)
CA (1) CA2311210C (fr)
DE (2) DE19926926A1 (fr)
DK (1) DK1060795T3 (fr)
ES (1) ES2294985T3 (fr)

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KR101106696B1 (ko) * 2003-07-24 2012-01-18 랜스버그 인더스트리얼 피니싱 케이.케이. 정전도장장치
US20060102075A1 (en) * 2004-11-18 2006-05-18 Saylor Austin A Fluid flow control
JP5140243B2 (ja) 2005-08-29 2013-02-06 バブコック日立株式会社 触媒用基材、触媒およびそれらの製造方法
ATE508804T1 (de) * 2006-09-27 2011-05-15 Duerr Systems Gmbh Elektrostatische zerstäuberanordnung
GB0625583D0 (en) * 2006-12-21 2007-01-31 Itw Ltd Paint spray apparatus
CN100450632C (zh) * 2007-04-28 2009-01-14 武汉科技大学 一种利用高压静电实现液体超细雾化的装置
JP2009072717A (ja) * 2007-09-21 2009-04-09 Panasonic Electric Works Co Ltd 静電霧化装置及びそれを備えた加熱送風装置
US8096264B2 (en) * 2007-11-30 2012-01-17 Illinois Tool Works Inc. Repulsion ring
DE102009013561A1 (de) 2009-03-17 2010-10-07 Dürr Systems GmbH Überwachungsverfahren und Überwachungseinrichtung für eine elektrostatische Beschichtungsanlage
CN108816542B (zh) * 2018-06-11 2021-01-15 佛山市优正涂装科技有限公司 静电粉末喷枪系统的区域功率自动控制方法

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Also Published As

Publication number Publication date
US6537378B1 (en) 2003-03-25
DE19926926A1 (de) 2000-12-21
US6656536B2 (en) 2003-12-02
JP4638976B2 (ja) 2011-02-23
CA2311210A1 (fr) 2000-12-14
EP1060795A3 (fr) 2003-05-21
DE50014755D1 (de) 2007-12-20
ATE377453T1 (de) 2007-11-15
EP1060795A2 (fr) 2000-12-20
ES2294985T3 (es) 2008-04-16
JP2001025688A (ja) 2001-01-30
US20030064167A1 (en) 2003-04-03
DK1060795T3 (da) 2008-02-11
CA2311210C (fr) 2005-08-09

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