EP0707521B1 - Elektrostatische sprayvorrichtung mit rotierendem sprühkopf zum sprühen eines anstrichproduktes in puderform - Google Patents

Elektrostatische sprayvorrichtung mit rotierendem sprühkopf zum sprühen eines anstrichproduktes in puderform Download PDF

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Publication number
EP0707521B1
EP0707521B1 EP94917699A EP94917699A EP0707521B1 EP 0707521 B1 EP0707521 B1 EP 0707521B1 EP 94917699 A EP94917699 A EP 94917699A EP 94917699 A EP94917699 A EP 94917699A EP 0707521 B1 EP0707521 B1 EP 0707521B1
Authority
EP
European Patent Office
Prior art keywords
spraying device
head
coating product
conduit
spray
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
EP94917699A
Other languages
English (en)
French (fr)
Other versions
EP0707521A1 (de
Inventor
Michel Di Gioia
Van Tan Pham
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.)
Sames SA
Original Assignee
Sames SA
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 Sames SA filed Critical Sames SA
Publication of EP0707521A1 publication Critical patent/EP0707521A1/de
Application granted granted Critical
Publication of EP0707521B1 publication Critical patent/EP0707521B1/de
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
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material
    • 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
    • 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
    • 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 electrostatic sprayer of powdery coating product, such as for example a hot-melt paint, comprising a rotary projection head. It relates more particularly to the high voltage supply of the projection head.
  • Rotating electrostatic sprayers of coating product, liquid or in powder form are effective because they combine with centrifugal forces of projection electrical forces to guide the particles of product towards the object to be covered which is kept to the ground. To do this, the product must be electrically charged.
  • the most effective charging means is to bring to a high voltage, such as for example 100 kilovolts, the rotary projection head or a part thereof.
  • this projection head is in motion relative to the body of the projector.
  • the usual rotational speeds which make it possible to obtain a fairly regular projection to guarantee a satisfactory surface condition on the objects to be coated are of the order of several thousand, even several tens of thousands of revolutions per minute.
  • brushes sometimes called pads, have been arranged at the periphery of the shaft supporting the projection head.
  • the peripheral speed of the shaft is 78.5 m / s, or 283 km / h.
  • the invention solves all of these problems.
  • an electrostatic sprayer of powdery coating product comprising a coating product supply duct opening axially at the bottom of a rotary projection head and a high voltage supply circuit of said projection head, characterized in that said circuit includes a axial contact between said projection head and a fixed part carried by said duct.
  • a pin is mounted movable axially on the projection head and is in contact with a conductive part carried by the supply duct.
  • the high voltage can be applied to the axis of rotation of the projection head at a point compatible with the use of a central supply of the projection head with coating product. At the point of contact between the pin and the supply duct, the friction forces are minimal and this contact therefore does not limit the speed of rotation of the projection head.
  • the pin is kept in contact with the conduit by a spring which conducts the high voltage in the deflector of the projection head to the charging electrode.
  • This projector comprises a body 1 in the central part of which is fixed an air-powder mixture supply pipe 2 of a rotary projection head 3.
  • the axis of symmetry XX ′ of the supply pipe 2 is also the axis of rotation of the projection head 3.
  • This projection head consists of an element generally in the form of a bowl 4 and a deflector 5 made integral with a hub 6 by one or more screws 7.
  • the element 4 and the deflector 5 are for example made of plastic.
  • the hub 6 is rotated by a hollow shaft 8 disposed around the supply duct 2.
  • the hollow shaft is integral with the rotor 9 of an air turbine known per se and can rotate around the axis XX 'thanks to two ball bearings 10 and 10'.
  • This turbine is supplied with air by a duct 11.
  • the air which has driven the rotor 9 is discharged towards the projection head in the gap between the hollow shaft 8 and the duct 2. It serves as dilution air for the air-coating product mixture and prevents particles of coating product from going up along the external surface of the duct 2 in the direction of the rotor 9 or the bearings 10 and 10 ′ or from being deposited along this duct. which would be incompatible with operation of the projector with different coating products, such as paints of different colors, due to possible mixtures between the products.
  • a support 20 is fixed to the body 1 by means of one or more screws 21; it is intended to hold in place the end of a high voltage cable not shown.
  • An electrical conductor 22 connects the end of the support 20 to the outer face of the conduit 2 which is conductive, for example covered with a metallic layer 23.
  • the end of the conduit 2 carries a tubular end piece 24 made of conductive, plastic or metallic material , in electrical contact with the metallic layer 23.
  • This endpiece 24 comprises three regularly distributed tabs 25 which meet at the center of the duct 2 to form the support for a conductive patch 26, for example metallic, placed on the axis XX 'of the conduit 2.
  • the circuit formed by the conductor 22, the layer 23, the end piece 24 and a lug 25 makes it possible to supply the pellet 26 with high voltage.
  • the junction zone of the lugs 25 in which the pellet 26 is housed is conical on the side where the air-product mixture arrives in order to present a minimum resistance to the flow of this mixture.
  • legs 25 can be suitably profiled.
  • the deflector 5 carries, on its axis of rotation XX ', a conductive pin 30, for example metallic, kept in contact with the pad 26 under the effect of a spring 31, also conductive.
  • the spring 31 is supported on the front face of the deflector which is constituted by a disc-shaped charging electrode 32. In this way, the high voltage which is transmitted from the pad 26 to the pin 30 is conveyed to the edge of the electrode 32 where the air-coating product mixture is charged when it is sprayed.
  • the deflector 5 is metallic and the charging electrode 32 is formed by the edge of the deflector.
  • the electrode 32 can be embedded in the mass of the deflector 5; the spring 31 is then brought into contact with a part of the electrode 32 by any suitable means.
  • the above construction is such that the point of electrical contact between the pin and the pad 26 is that where the friction is minimal because the tangential speed on the axis XX 'is zero. Contact takes place in the path of the air-powder mixture.
  • the contact surface is cleaned each time that the duct 2 is cleaned, that is to say in particular at each change of color of coating product if the projector is used with several products of different colors.
  • the pin 30 is held in abutment by the spring 31 ensures constant contact between the pin and the pad 26 whatever the degree of tightening of the screws 7 and this, without risk of damaging the pad or the pin in the event of excessive tightening.
  • the pin is susceptible to movements of small amplitude along the axis XX 'to correct any inaccuracies in the assembly.
  • this spring makes it possible to make up for the tolerances inherent in industrial manufacturing: it is not necessary to pair the deflector 5 and the pin 30 with the end piece 24 and the patch. 26.
  • the projection head 3 can thus be changed independently of the end piece 24 during the usual projector maintenance operations.
  • pin 30 and the spring 31 could be mounted on the fixed part in place of the pad 26.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (10)

  1. Elektrostatische Sprühvorrichtung für pulverförmiges Beschichtungsmaterial mit einem Kanal (2) zur Zufuhr des Beschichtungsmaterials, der axial im Boden eines rotierenden Sprühkopfes (3) mündet, und einem Hochspannungsversorgungsschaltkreis des Sprühkopfes,
    dadurch gekennzeichnet,
    daß der Schaltkreis (22,23,24,25,26,30,31,32) einen axialen Kontakt zwischen dem Sprühkopf und einem feststehenden, von dem Kanal getragenen Teil (26) umfaßt.
  2. Sprühvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Sprühkopf (3) einen Abweiser (5) umfaßt, dessen Rand eine Ladungselektrode (32) bildet oder trägt.
  3. Sprühvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der axiale Kontakt durch ein Metallstück (30) gebildet wird, das axial auf dem Sprühkopf in elektrischem Kontakt mit einem feststehenden Teil (26) des Sprühkopfes befestigt ist, wobei der feststehende Teil elektrisch leitend ist.
  4. Sprühvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der elektrische Kontakt zwischen dem Metallstück (30) und dem feststehenden Teil (26) in der Bahn des Beschichtungsmaterials liegt.
  5. Sprühvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Metallstück (30) für Bewegungen mit kleiner Amplitude längs der Drehachse (XX') des Sprühkopfes geeignet ist.
  6. Sprühvorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß eine Feder (31) zwischen dem Metallstück (30) und der Ladungselektrode (32) angeordnet ist.
  7. Sprühvorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Feder (31) den elektrischen Kontakt zwischen dem Metallstück (30) und der Ladungselektrode (32) sicherstellt.
  8. Sprühvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Zufuhrkanal (2) mit einer Kontaktpastille (26) für das Metallstück (30) ausgerüstet ist, wobei die Pastille auf der Drehachse (XX') des Sprühkopfes (3) angeordnet ist und durch mindestens einen Fuß (25) aus elektrischem Material, der an dem Kanal befestigt ist, in Stellung gehalten wird.
  9. Sprühvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die äußere Fläche des Zufuhrkanals aus elektrischem Material besteht oder mit einer leitenden Schicht (23) bedeckt ist.
  10. Sprühvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Schaltkreis eine auf der äußeren Fläche des Zufuhrkanals vorgesehene leitende Schicht (23) und einen rohrförmigen leitenden Ansatz (24) umfaßt, der am Ende des Kanals angeordnet ist, wobei der Ansatz in elektrischem Kontakt mit der Schicht ist und mindestens einen leitenden Fuß (25) umfaßt, der die Abstützung des feststehenden Teils (26) bildet.
EP94917699A 1993-06-17 1994-06-01 Elektrostatische sprayvorrichtung mit rotierendem sprühkopf zum sprühen eines anstrichproduktes in puderform Expired - Lifetime EP0707521B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9307296A FR2706328B1 (fr) 1993-06-17 1993-06-17 Projecteur électrostatique de produit de revêtement pulvérulent comportant une tête de projection rotative.
FR9307296 1993-06-17
PCT/FR1994/000638 WO1995000250A1 (fr) 1993-06-17 1994-06-01 Projecteur electrostatique de produit de revetement pulverulent comportant une tete de projection rotative

Publications (2)

Publication Number Publication Date
EP0707521A1 EP0707521A1 (de) 1996-04-24
EP0707521B1 true EP0707521B1 (de) 1997-02-19

Family

ID=9448225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94917699A Expired - Lifetime EP0707521B1 (de) 1993-06-17 1994-06-01 Elektrostatische sprayvorrichtung mit rotierendem sprühkopf zum sprühen eines anstrichproduktes in puderform

Country Status (7)

Country Link
EP (1) EP0707521B1 (de)
JP (1) JPH09502123A (de)
KR (1) KR960703039A (de)
DE (1) DE69401777T2 (de)
ES (1) ES2098150T3 (de)
FR (1) FR2706328B1 (de)
WO (1) WO1995000250A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030080206A1 (en) * 2001-03-08 2003-05-01 Thomas Duerr Powder bell purge tube

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536580A (en) * 1967-10-13 1970-10-27 Ransburg Electro Coating Corp Paper making methods and apparatus involving electrostatic spray coating
US3572589A (en) * 1968-07-31 1971-03-30 Edward O Norris Electrostatically driven distributor
JPS57144053A (en) * 1981-03-04 1982-09-06 Toyota Motor Corp Rotary atomizing electrostatic coating device
GB2142844A (en) * 1983-07-05 1985-01-30 Edward Julius Bals Sprayers

Also Published As

Publication number Publication date
EP0707521A1 (de) 1996-04-24
FR2706328A1 (fr) 1994-12-23
JPH09502123A (ja) 1997-03-04
KR960703039A (ko) 1996-06-19
DE69401777D1 (de) 1997-03-27
ES2098150T3 (es) 1997-04-16
DE69401777T2 (de) 1997-09-04
FR2706328B1 (fr) 1995-09-29
WO1995000250A1 (fr) 1995-01-05

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