EP0270408B1 - Elektrostatische Farbspritzanlage für Farben auf Wasserbasis - Google Patents

Elektrostatische Farbspritzanlage für Farben auf Wasserbasis Download PDF

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Publication number
EP0270408B1
EP0270408B1 EP87402461A EP87402461A EP0270408B1 EP 0270408 B1 EP0270408 B1 EP 0270408B1 EP 87402461 A EP87402461 A EP 87402461A EP 87402461 A EP87402461 A EP 87402461A EP 0270408 B1 EP0270408 B1 EP 0270408B1
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Prior art keywords
paint
circuit
sprayers
valves
objects
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
EP87402461A
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English (en)
French (fr)
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EP0270408A1 (de
Inventor
Adrien Lacchia
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Sames SA
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Sames SA
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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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • 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
    • B05B5/1633—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 the arrangement comprising several supply lines arranged in parallel, each comprising such an 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
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0278—Arrangement or mounting of spray heads

Definitions

  • the invention relates to an electrostatic paint spraying installation and more particularly to a new type of paint called "water", usable on automobile bodies and having a low resistivity.
  • water a new type of paint
  • the invention aims more particularly to solve the problems posed by the low resistivity of these new paints, when they are used with electrostatic projectors brought to a high voltage and when the paint is supplied via long circuits of paint circulation in closed loop, earthed.
  • a conventional electrostatic paint spraying installation in a production unit as large as an automobile manufacturing plant, for example, generally comprises several very long closed-loop paint circulation circuits (these circuits can cross a whole part of the factory) which establish the link between large paint tanks and the different projection booths. It is therefore necessary to provide at least one such circuit per color and another circuit of the same kind, for the solvent or diluent. For obvious safety reasons, these circuits are connected to earth. They will be called for convenience "primary circuits" throughout the description.
  • the objects to be painted in this case the bodies in the example envisaged, are carried by conveying means passing through said booth and thus pass opposite several electrostatic projectors positioned at different levels and oriented in different directions, often articulated with respect to their own supports, so as to paint respective areas of said objects.
  • the dimensions and shape of the objects are such that at least nine projectors are generally required per paint station.
  • those skilled in the art have always sought to space the projectors as little as possible because the organic solvent paints used until now dry relatively quickly.
  • the layer or layers successively applied must still be sufficiently liquid to merge with each other.
  • the invention also does not relate to this category of solutions but seeks to retain the advantages of the electrostatic charge of the paint by the spraying member directly brought to high voltage, that is to say in particular by the bowl of spraying rotating at high speed.
  • French Patent No. 2572662 proposes to fill the intermediate reservoir with the quantity of paint just necessary for each application. This operation is carried out in the air. However, each change of color requires, as mentioned above, to clean the intermediate tank and all the pipes connected to it. In addition, the reestablishment of the insulation after filling is done by draining and drying a sufficient portion of conduit, upstream of the intermediate tank. All of this requires prohibitive time each time the color changes.
  • French Patent No. 2454846 proposes a similar arrangement to the above but requires a projector, as many intermediate reservoirs as there are colors. In an installation comprising several projectors, teaching it would therefore indiscriminately multiply the number of intermediate tanks, and therefore the cost of the installation.
  • the invention aims to eliminate all the problems stated above and proposes a new arrangement, requiring in particular only one intermediate reservoir per color, whatever the number of projectors and also making it possible to minimize the time of color change thanks to a new arrangement of the projectors, relative to each other.
  • This last characteristic means that the projectors generally have no objects to paint in front of them.
  • the front of the two consecutive objects is defined relative to the direction of movement.
  • FIGS. 1 and 2 there is shown an electrostatic paint projection booth 11, traversed longitudinally at ground level, by conventional conveyor means 12, carrying objects to be painted spaced apart from one another. other.
  • the objects 13 are here car bodies. They are therefore, quite bulky to the point of requiring nine paint projectors 15 to 23.
  • Each projector comprises a projection member 26 such as for example a projection bowl rotating at high speed, brought to high voltage.
  • the projectors 15 to 17 are oriented downwards to paint the upper parts of the body, the projectors 18 and 19 are oriented horizontally and located on either side of the conveyor means for painting the lower lateral parts, while the projectors 20 to 23 are oriented and located analogously to the projectors 18 and 19 but to paint the upper lateral parts.
  • the bodies 13 follow one another on the conveying means 12 and are regularly spaced so that the fronts of two consecutive bodies are separated by a distance d substantially constant. This feature is taken advantage of in the context of the invention.
  • the headlights 15 to 23 are divided into two groups A and B, the headlights of these two groups all being substantially located in two respective planes at least approximately perpendicular to the path of the bodies 13 and separated from each other, by the distance d defined above, approximately.
  • the searchlights being each time distributed in separate planes of this same distance.
  • the dimension of the objects to be painted made it possible to have all the projectors in the vicinity of the same plane, this arrangement, completed as indicated below, would be within the scope of the invention.
  • the goal as it clearly appears in FIGS. 1 and 2 is, in fact, to ensure that all the projectors can be at all times in a state, either to paint, or not to paint or possibly to undergo a color change cycle.
  • FIGS. 1 and 2 there is shown schematically the entire system for supplying paint to two projectors A and B which symbolize, for example, all the projectors 15 to 19 of group A and all the projectors 20 to 23 of group B, as shown in FIGS. 1 and 2.
  • Installation is also simplified in the case of only two colors.
  • the elements or sub-assemblies whose number depends on the number of projectors or groups of projectors and the elements or sub-assemblies whose number depends on the number of colors will be indicated below.
  • This solvent circuit is unique.
  • the projectors A, B can be connected by a set of valves to intermediate tanks 32, 34 isolated from the ground. There is an intermediate tank per primary paint circuit, each tank corresponding to a circuit. Each reservoir 32, 34 is also connected to the primary circuit which corresponds to it by a controlled connection means 38, 40 respectively.
  • this is a known device forming a quick coupling, such as one of those sold under the brand "STAUBLI". Such a device, when it is disconnected under the action of an automatic control, has its male and female ends sufficiently distant from each other so that there is a perfect fluidic and especially electrical disconnection, without risk of arcing.
  • Each reservoir 32, 34 is hermetically closed but can nevertheless be placed either in the atmosphere or under pressure by an electrically controlled valve 50.
  • One of the inputs of this valve is to the atmosphere and the other is connected to the air source 48.
  • the reservoir is normally kept under overpressure except at times when paint is taken from the primary circuit to perfect the level in the intermediate tank.
  • the valve 50 is controlled so that the tank is vented.
  • the paint is taken from the tank by a pump 51.
  • Each tank 32, 34 is connected to all the sprayers A, B by respective controlled selection valves 52A, 52B and 54A, 54B. More specifically, the output of the pump 51 from each reservoir 32, 34 flows into a secondary closed-loop paint circulation circuit 56 or 58, respectively, returning to the same reservoir and connected to the inputs of the selection valves 52A, 52B or 54A, 54B, respectively, establishing the connection with the various projectors A, B.
  • valves 52A, 54A corresponding to the projector A are grouped in a color changing unit 60A while the valves 52B, 54B corresponding to the projector B are grouped in another color changing unit 60B.
  • the outputs of the valves grouped in a color changing unit are connected to a collector 62A or 62B connected to the corresponding projector A or B.
  • a flow regulator 66 a cut-off valve 67 and a discharge valve 68, the output of which is connected to a reservoir. recovery 69, isolated.
  • the valves 67 and 68 are actuated in the usual way during the rinsing and color change cycles.
  • the primary solvent circulation circuit 33 also connected to earth, is connected to the inputs of as many flushing valves 70A, 70B as there are projectors, by means of a controlled connection means 72 analogous to means 38, 40 described above.
  • Each color change unit thus contains a flushing valve, the outlet of which is connected to the corresponding collector 62A or 62B. If it was necessary to anticipate a color change cycle on certain projectors before the end of the spraying period for other projectors, we could consider adding an intermediate solvent tank connected exactly like tanks 32 or 34, thereby defining a secondary closed-loop solvent circulation circuit.
  • the compressed air source 48 is connected to as many push-dry valves 72A, 72B as there are projectors, the outputs of these valves being respectively connected to the collectors 62A, 62B.
  • Each color change unit thus includes such a push-dry valve.
  • the high voltage source 74 is conventional, its value is adjustable at any time between zero volts and a nominal voltage of the order of 120kV.
  • control means 76 centralized for example at a control desk.
  • control means 76 can have very different structures, electromechanical or electronic; they are associated or not with a computer ... Their design is (once the painting sequences defined) within the reach of those skilled in the art and that is why they have not been described in more detail.
  • a feature, according to the invention, of these control means is that they are arranged (programmed) to control the or certain connection means 38, 40 or 72 only when the high voltage source 74 has previously been brought to zero or at an acceptable residual voltage.
  • the operation is as follows.
  • the intermediate reservoirs 32, 34 are filled with paints of different colors coming respectively from the primary circuits 28, 30 and the pumps 51 maintain a continuous circulation of paint in the secondary circuits 56, 58.
  • paints of different colors are therefore presented at the fluid inlets of the selection valves 52A, 52B, 54A, 54B. It should be noted that, upstream of the projectors, the paint is never sprayed or projected by jet or by gravity, in the open air, from one tank to another. This prevents it from evaporation or degradation and allows it to retain its original qualities.
  • Solvent from the primary circuit 33 is also presented to the fluid inlets of the valves 70A, 70B, while pressurized air is presented to the fluid inlets of the valves 72A, 72B.
  • the control means 76 open the corresponding valves 52 or 54 and the high voltage is brought to its nominal value.
  • the connection means 38, 40 and 72 are electrically and hydraulically "open", that is to say that the connection with the primary circuits is cut.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)

Claims (8)

1. Elektrostatische Farbspritzanlage mit geringem spezifischen Widerstand, die mehrere primäre Kreisläufe für die Umwälzung der Farbe in geschlossenem Kreislauf, wobei jeder Kreislauf (28, 30) geerdet ist und eine Farbe von anderem Farbton enthält, Fördervorrichtungen, die einander ähnliche zu spritzende Objekte im Abstand zueinander fördern und sie bezüglich mehrerer Farbspritzeinrichtungen plazieren, aufweist, wobei letztere so angeordnet sind, daß sie jeweils spezielle Zonen der Objekte lackieren, und wobei jede Spritzeinrichtung (A, B) mit einem mit einer Hochspannung (74) verbundenen Spritzorgan versehen ist und über eine Anordnung von Ventilen und Zwischenreservoiren (32, 34), die gegenüber der Erde isoliert und ausschließlich mit den vorgenannten Primärkreisläufen verbindbar sind, versorgt werden, dadurch gekennzeichnet, daß die Objekte in der Weise regelmäßig beabstandet sind, daß die Stirnseiten zweier aufeinander folgender Objekte über die Länge der Fördereinrichtung durch eine in etwa konstante Entfernung getrennt sind und:
- die Zahl der Zwischenreservoire (32, 34) gleich der Zahl der Primärkreisläufe ist, wobei jedes Reservoir einem solchen Kreislauf entspricht,
- jedes Zwischenreservoir mit dem ihm entsprechenden Primärkreislauf über eine gesteuerte Verbindungseinrichtung (28, 30) verbunden ist,
- jedes Zwischenreservoir mit allen Zerstäubern jeweils über gesteuerte Mehrwegeventile (52a, 54a, 52b, 54b) verbunden ist,
- die Spritzeinrichtungen (A, B) alle in etwa in der gleichen Ebene senkrecht zur Laufrichtung der Objekte oder in solchen ungefähr durch die in etwa konstante Entfernung voneinander getrennten Ebenen angeordnet sind, und
- Steuereinrichtungen (76) so ausgelegt sind, daß sie die oder bestimmte Verbindungseinrichtungen nur steuern, wenn keine Spritzeinrichtung an Hochspannung liegt.
2. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß jedes Zwischenreservoir (32, 34) eine Einrichtung zur Auffüllung auf konstantes Niveau aufweist, die einen Niveauanzeiger (44) und ein dadurch gesteuertes Ventil (46) umfaßt, wobei das Ventil zwischen das Zwischenreservoir und den entsprechenden Primärkreislauf geschaltet ist.
3. Anlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein sekundärer Kreislauf für die Farbumwälzung in geschlossenem Kreislauf (56, 58) zwischen jedem Zwischenresewoir (32, 34) und den Eingängen der mit verschiedenen Spritzeinrichtungen verbundenen vorgenannten Mehrwegeventile vorgesehen ist.
4. Anlage nach Anspruch 3, dadurch gekennzeichnet, daß jede Spritzeinrichtung (A, B) von einer Farbwechseleinheit mit Fluiden versorgt wird, die so viele Mehrwegeventile (52, 54) aufweist, wie es Zwischenreservoire gibt, wobei die Ausgänge der Mehrwegeventile mit einer Sammelleitung (62a, 62b) verbunden sind, welche an die Spritzeinrichtung angeschlossen ist.
5. Anlage nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie außerdem einen Primärkreislauf für die Führung von Lösungsmittel in geschlossenem Kreislauf (33) aufweist, der geerdet ist und eine gesteuerte Verbindungseinrichtung (72) aufweist, die den Lösungsmittelkreislauf mit so vielen Spülventilen (70a, 70b) verbindet, wie es Spritzeinrichtungen gibt.
6. Anlage nach Anspruch 4 und 5 zusammengenommen, dadurch gekennzeichnet, daß jede vorgenannte Farbwechseleinheit (60a, 60b) ein solches Spülventil aufweist, dessen Ausgang mit der entsprechenden Sammelleitung verbunden ist.
7. Anlage nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß sie eine Einrichtung zur Luftversorgung (48) aufweist, die mit so vielen gesteuerten Freiblas- und Trocknungsventilen (72a, 72b) verbunden sind, wie es Spritzeinrichtungen gibt, wobei die Ausgänge dieser Ventile jeweils mit den Spritzeinrichtungen verbunden sind.
8. Anlage nach den Ansprüchen 4 und 7, dadurch gekennzeichnet, daß jede Farbwechseleinheit ein solches Freiblas- und Trocknungsventil aufweist, dessen Ausgang mit der entsprechenden Sammelleitung (62) verbunden ist.
EP87402461A 1986-11-26 1987-11-02 Elektrostatische Farbspritzanlage für Farben auf Wasserbasis Expired - Lifetime EP0270408B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8616466A FR2607030B1 (fr) 1986-11-26 1986-11-26 Installation de projection electrostatique de peinture a base d'eau
FR8616466 1986-11-26

Publications (2)

Publication Number Publication Date
EP0270408A1 EP0270408A1 (de) 1988-06-08
EP0270408B1 true EP0270408B1 (de) 1990-07-18

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EP87402461A Expired - Lifetime EP0270408B1 (de) 1986-11-26 1987-11-02 Elektrostatische Farbspritzanlage für Farben auf Wasserbasis

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EP (1) EP0270408B1 (de)
JP (1) JPS63137763A (de)
KR (1) KR950000327B1 (de)
DE (1) DE3763810D1 (de)
ES (1) ES2015963B3 (de)
FR (1) FR2607030B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932623A1 (de) * 1988-09-30 1990-05-31 Binks Mfg Co Anordnung zum zufuehren ausgewaehlter elektrisch leitender beschichtungsmaterialien zu einer mit hochspannung arbeitenden elektrostatischen beschichtungsvorrichtung und entsprechendes zufuehrungsverfahren

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI126677B (en) 2014-07-17 2017-03-31 Johannes Vähänen INJECTOR, REMOTE CONTROL TOOL AND METHOD OF CONTROL INJECTION DIRECTION OF INJECTOR
WO2020252732A1 (zh) * 2019-06-20 2020-12-24 墙煌新材料股份有限公司 一种水油共用静电喷涂系统

Family Cites Families (3)

* 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.
DE2819302B2 (de) * 1978-05-02 1980-12-18 Ransburg Gmbh, 6056 Heusenstamm Lackmengensteuersystem
US4348425A (en) * 1981-01-26 1982-09-07 Ransburg Corporation Variable low-pressure fluid color change cycle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932623A1 (de) * 1988-09-30 1990-05-31 Binks Mfg Co Anordnung zum zufuehren ausgewaehlter elektrisch leitender beschichtungsmaterialien zu einer mit hochspannung arbeitenden elektrostatischen beschichtungsvorrichtung und entsprechendes zufuehrungsverfahren

Also Published As

Publication number Publication date
EP0270408A1 (de) 1988-06-08
FR2607030B1 (fr) 1989-04-07
KR880005970A (ko) 1988-07-21
FR2607030A1 (fr) 1988-05-27
JPS63137763A (ja) 1988-06-09
DE3763810D1 (de) 1990-08-23
ES2015963B3 (es) 1990-09-16
KR950000327B1 (ko) 1995-01-13

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