EP0227992B1 - Pistolet de pulvérisation électrostatique - Google Patents

Pistolet de pulvérisation électrostatique Download PDF

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Publication number
EP0227992B1
EP0227992B1 EP86117181A EP86117181A EP0227992B1 EP 0227992 B1 EP0227992 B1 EP 0227992B1 EP 86117181 A EP86117181 A EP 86117181A EP 86117181 A EP86117181 A EP 86117181A EP 0227992 B1 EP0227992 B1 EP 0227992B1
Authority
EP
European Patent Office
Prior art keywords
electrostatic spray
spray gun
handle
gun 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.)
Expired
Application number
EP86117181A
Other languages
German (de)
English (en)
Other versions
EP0227992A2 (fr
EP0227992A3 (en
Inventor
Wolfgang Kuhn
Norbert Buchholz
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.)
Kopperschmidt-Muller GmbH and Co KG
Original Assignee
Kopperschmidt-Muller 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
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Application filed by Kopperschmidt-Muller GmbH and Co KG filed Critical Kopperschmidt-Muller GmbH and Co KG
Priority to AT86117181T priority Critical patent/ATE46459T1/de
Publication of EP0227992A2 publication Critical patent/EP0227992A2/fr
Publication of EP0227992A3 publication Critical patent/EP0227992A3/de
Application granted granted Critical
Publication of EP0227992B1 publication Critical patent/EP0227992B1/fr
Expired 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • 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
    • B05B5/0531—Power generators

Definitions

  • the invention relates to an electrostatic spray gun for liquid or in particular powdery materials, with a gun body that has a handle and a trigger, with a gun tube connected to it with an outlet opening, which via a material channel with a material connection arranged in front of the trigger and optionally via an air duct is connected to an air connection, and to a high-voltage system which is partially held in the handle and has a high-voltage generator and at least one high-voltage electrode.
  • the entire high-voltage generator In a known spray gun of this type (EP-A 157 199), the entire high-voltage generator, the construction of which is not described in detail, is housed in the handle.
  • the handle For this purpose, it has a plastic jacket which is shaped like a handle and has the air connection and the first section of the air duct on its rear side.
  • the material connection is located at the front end of the gun body directly behind a separation point.
  • the gun tube which is fastened to the gun body by a screw connection, has several channels, namely a central material channel and outside of it each offset by 120 °, a channel for atomizing air, a channel for shaped air and a channel for a high-voltage cable that to the spray head arranged electrode leads.
  • the invention has for its object to provide an electrostatic spray gun of the type described in the introduction, which makes it possible, while largely maintaining the favorable center of gravity, to design the high-voltage generator larger or to include other functional elements in the handle without the handle having too large dimensions.
  • the high voltage generator consists of two assemblies, one of which is arranged on the back of the handle, contains an oscillator and a transformer and is provided with a low voltage input, and of which the other assembly in the gun body between the handle and the material connection is arranged, contains a voltage multiplier and is provided with a high voltage output.
  • the heaviest part of the high-voltage generator namely the transformer, is still under control. But it has moved as far back as possible.
  • Due to the position of the first module there is enough space in the front part of the handle for further functions.
  • the position of the second module has the advantage that the distance between the high-voltage output and the electrode is smaller, that is, the required high-voltage line is shorter.
  • the first assembly preferably has a housing which is interchangeably inserted in a recess in the gun body provided on the handle back and forms the rear of the handle with its exposed rear wall.
  • the first assembly therefore occupies the very rearmost position, which improves the center of gravity. It can also be easily replaced.
  • the housing is made of metal and is grounded. This results in increased safety for the operator. Because the ball of your hand is automatically in contact with the housing during operation, so that the operator is also grounded.
  • the metal housing also serves as a heat sink for dissipating the heat generated in the transformer.
  • the housing has a U-shaped cross section with the width of the handle. As a result, the entire rear portion of the handle is formed by the housing.
  • the housing has a relatively large width and can therefore either accommodate a larger transformer or, with the same volume, otherwise have a smaller depth.
  • the handle on the front can have a recess in which the trigger provided with side walls constantly engages. There is therefore no risk of any parts getting caught between the trigger and the handle.
  • the elements actuated by the trigger such as an air valve, are protected.
  • a switch in particular a proximity switch, can be arranged in the front part of the handle below the trigger, which can be actuated by a control element on the underside of the trigger. In this way, the switch can be assigned to the first assembly in a spatially closely adjacent manner.
  • the switch is preferably axially displaceable by a separation path in a bore extending parallel to the front of the handle. The operator can therefore disable the switch by axial displacement. There this is done on the handle, this ineffectiveness can be done by hand.
  • the switch should be switched on with one pole in the low-voltage supply line of the first module running in the handle.
  • the result is an extremely short connecting line in the handle. It is then sufficient to provide a simple feed cable that places little strain on the spray gun.
  • Such a device is readily suitable for a liquid gun with pressure atomization and an air valve actuated by the trigger. If another electrical device is switched on when the trigger is actuated, for example powder delivery in the case of a powder gun, this can be done with the aid of a current interrogation circuit which monitors the current flowing to the high-voltage generator.
  • the gun body is particularly advantageously divided between the handle and the second assembly, and the second assembly can be inserted into the front gun body part from the division level. This allows the second assembly to be replaced without difficulty. It is particularly expedient if the at least one electrode is arranged in the gun body and the gun tube can be separated therefrom. On the one hand, this leads to a saving in weight and a favorable position of the center of gravity, because the electrode is in the vicinity of the high-voltage output and no high-voltage cable leading to the outlet opening has to be provided. On the other hand, the gun barrel is free of parts of the high-voltage system and can therefore be cleaned easily. This is because cleaning can neither mechanically damage the high-voltage electrode, nor can parts of the high-voltage system be attacked by cleaning agents. Since there is no need for a high-voltage contact connection at the separation point, no rotation angle alignment needs to be taken into account when assembling the parts.
  • an air tube can be arranged in the gun tube, which is also connected to the gun body in a pluggable manner at any point of rotation.
  • the electrode should be located in an inlet connection from the material connection. Here it is also secured against unwanted touch.
  • the electrode should be located in an air duct passing through the second assembly.
  • the electrode is also protected against contact here.
  • the at least one electrode can also be arranged in the gun body in such a way that after removal of the gun barrel in the event of an inadvertent actuation of the trigger, an operator cannot receive a blow and there is no sparkover which could lead to an explosion, for example, in a solvent atmosphere. It is only necessary to ensure that the distance of the at least one electrode from the end face of the separation point is greater than the sparkover gap. In the same way, the distance of the electrode in the material duct from the material connection and the distance of the electrode in the air duct from a throttle valve arranged near the handle should be greater than the sparkover gap.
  • the illustrated powder spray gun has a gun body 1 and a gun tube 2, which are connected to one another at a separation point 3 along a cylinder surface 4.
  • the gun body 1 has a rear part 5 with a handle 6 and a front part 8 connected to it via a parting plane 7, on which a material inlet connection 9 with a material connection 10 is formed.
  • a material line 11 is attached to this material connection 10.
  • An air tube 12 is arranged in the interior of the gun tube and is connected to the gun body 1 at the separation point 3 via a cylindrical surface 13 in any rotational angle position.
  • This air tube 12 is provided with an impact body 14 at the front. In this way, a material channel results between the material connection 10 and an outlet opening 15, the first section 16 of which runs in the inlet connection and the second section 17 has an annular cross section and is arranged between the gun tube 2 and the air tube 12.
  • An air connection 18 is connected to an air line 19.
  • a first section 20 of an air duct extends from it, which leads via an air valve 21 that can be switched on and off and an adjustable air throttle valve 22 to a second section 23 of the air duct, which runs first in the gun body 1 and then in the air pipe 12.
  • a high-voltage generator consists of a first assembly 24 on the rear of the handle 6 and a second assembly 25 in the gun body 1 between the handle 6 and the separation point 3.
  • the first assembly 24 has a low-voltage input 26, which is connected to an electrical lead 27, one Oscillator 28 and a transformer 29, which is embedded in an insulating plastic 30 and by a housing 31 made of metal with a U-shaped cross section are surrounded.
  • This housing is grounded via a line 32. It is inserted into a recess 33 of the handle 6 in such a way that its rear side 34 is exposed and is gripped by the operator's palm in operation.
  • the two side walls 35 and 36 of the housing have a distance equal to the grip width.
  • the entire assembly 24 is held in the recess 33 in an easily replaceable manner.
  • the output of the first assembly 24 is connected to the input of the second assembly 25 via a line 37 running in the gun body 1.
  • This has the usual components of a voltage multiplier circuit 38, in particular a cascade of capacitors and rectifiers.
  • the high-voltage output 39 is arranged on the one hand with an electrode 40 in the first section 16 of the material channel and on the other hand with an electrode 41 in that part of the second air channel section 23 which is located in the interior of the second assembly 25. If you dismantle the gun body 1 into its two parts 5 and 8, the second assembly can be easily replaced from the division level 7.
  • the air valve 21 is actuated with the aid of a trigger 42, which can be pivoted about a pivot point 43 and has side walls 44 which already engage in a recess 45 on the front of the handle 6 in the rest position.
  • the recess is sufficiently large that the trigger 42 can perform the full actuation stroke. There is no risk of any parts getting caught.
  • the trigger 42 can be injection molded from plastic, for example.
  • a control element 46 which allows a switch 47 which is also located in the front handle part to be actuated.
  • a switch 47 which is also located in the front handle part to be actuated.
  • it is a proximity switch 47, which is actuated by a metallic control element 46. But it can also be a reed contact that is actuated by a magnet.
  • the switch 47 is switched on via a line 47a with one pole in the supply line to the first module 24.
  • the switch 47 is arranged in a cylindrical slide 48 which is located in a cylindrical bore 49.
  • the slide is provided with a radial arm 50 which slides along a curve 51 when pivoted through 90 ° and thereby pulls the slide 48 downward against the force of a return spring 52.
  • the switch 47 becomes ineffective. It can no longer be operated by the control element 46.
  • the radial arm 50 can be operated by the operator with the little finger of the hand holding the handle 6.
  • the electrode 40 in the material channel is at a distance A from the material connection 11 which is greater than the sparkover gap at the given high voltage.
  • the distance B of this electrode to the end face 53 of the separation point 3 is also greater than this sparkover gap.
  • the center of gravity of the pistol is approximately in the grip area. Because the torque caused by the weight of the front parts 2, 8 and 12 is counteracted by the torque caused by the weight of the first assembly 24, in particular the transformer 29.
  • the gun tube 2 and the air tube 12 do not carry any parts carrying high voltage, they can be cleaned easily.
  • the first section 16 of the material channel remaining on the gun body is short and can be cleaned by blowing through it. When reinserting the pipes mentioned, no particular angle of rotation position has to be taken into account.
  • the plug enables easy removal and assembly.
  • the spray gun is easy to handle because only a material line 11, an air line 19 and an electrical line 27 have to be connected and attack the latter two lines on the underside of the handle.
  • a powder spray gun is illustrated. However, the same principle can also be applied to liquid spray guns, the material channel running centrally and the air channel concentrically.
  • a current detection stage can be switched on in line 27, which responds when a current flowing to the high-voltage generator 24 occurs and then turns on a pump, a blower, a valve or the like for the purpose of material conveyance.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Nozzles (AREA)

Claims (18)

1. Pistolet de pulvérisation électrostatique pour matières fluides ou notamment pulvérulentes, comprenant un corps (1) de pistolet muni d'une poignée (6) et d'une détente (42) ; un canon (2) relié audit corps, et présentant un orifice de sortie (15) relié, par l'intermédiaire d'un canal (16, 17) de passage de matière, à un raccord (10) à matière situé devant la détente, et éventuellement à un raccord pneumatique (18) par l'intermédiaire d'un canal (20, 23) de passage d'air ; ainsi qu'un système (24, 25) à haute tension logé en partie dans la poignée, et comprenant un générateur de haute tension et au moins une électrode (40, 41) conductrice de haute tension, caractérisé par le fait que le générateur de haute tension se compose de deux groupes structurels (24, 25), l'un (24) de ces groupes structurels étant disposé au dos de la poignée, renfermant un oscillateur (28) et un transformateur (29) et étant pourvu d'une entrée (26) de basse tension, l'autre groupe structurel (25) étant disposé dans le corps (1) du pistolet, entre la poignée (6) et le raccord (10) à matière, renfermant un multiplicateur de tension (38) et étant doté d'une sortie (39) de haute tension.
2. Pistolet de pulvérisation électrostatique selon la revendication 1, caractérisé par le fait que le premier groupe structurel (24) présente un carter (31) qui est logé, avec faculté de remplacement dans une échancrure (33) du corps (1) du pistolet prévue au dos de la poignée, et qui forme la face postérieure de cette poignée par sa paroi postérieure (34) apparente.
3. Pistolet de pulvérisation électrostatique selon la revendication 2, caractérisé par le fait que le carter (31) consiste en un métal, et est relié à la terre.
4. Pistolet de pulvérisation électrostatique selon la revendication 2 ou 3, caractérisé par le fait que le carter (31) possède une section configurée en U, représentant la largeur de la poignée (6).
5. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 4, caractérisé par le fait que la poignée présente, à sa face antérieure, un renfoncement (45) dans lequel la détente (42), munie de parois latérales (44), s'engage en permanence.
6. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 5, caractérisé par le fait qu'un interrupteur (47), en particulier un interrupteur de proximité disposé dans la partie antérieure de la poignée (6), au-dessous de la détente (42), est actionné par l'intermédiaire d'un élément de commande (46) situé à la face inférieure de la détente.
7. Pistolet de pulvérisation électrostatique selon la revendication 6, caractérisé par le fait que l'interrupteur (47) peut être décalé axialement d'une distance de séparation, dans un perçage (49) s'étendant parallèlement à la face antérieure de la poignée.
8. Pistolet de pulvérisation électrostatique selon la revendication 7, caractérisé par le fait que l'interrupteur (47) est logé dans un coulisseau (48) portant un bras radial (50) qui, lors d'une rotation, monte sur une rampe (51) et déplace ainsi le coulisseau, dans le perçage (49), en s'opposant à la force d'un ressort de rappel (52).
9. Pistolet de pulvérisation électrostatique selon l'une des revendications 6 à 8, caractérisé par le fait que l'interrupteur (47) est branché, par un pôle, dans le conducteur d'alimentation en basse tension du premier groupe structurel (24), s'étendant dans la poignée (6).
10. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 9, caractérisé par le fait que le corps (1) du pistolet est scindé entre la poignée (6) et le second groupe structurel (25), et ce second groupe structurel peut être inséré dans la partie antérieure (8) du corps du pistolet, à partir du plan de séparation (7).
11. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 10, caractérisé par le fait que l'électrode (40, 41) prévue au minimum est disposée dans le corps (1) du pistolet, et le canon (2) en est séparable.
12. Pistolet de pulvérisation électrostatique selon la revendication 11, caractérisé par le fait que le canon (2) est relié par emboîtement au corps (1) du pistolet, dans la zone de séparation (3), dans n'importe quelle position angulaire.
13. Pistolet de pulvérisation électrostatique selon la revendication 11 ou 12, caractérisé par le fait que le canon (2) renferme un conduit pneumatique tubulaire (12) également relié par emboîtement au corps (1) du pistolet, dans la zone de séparation (3), dans n'importe quelle position angulaire.
14. Pistolet de pulvérisation électrostatique selon l'une des revendications 11 à 13, caractérisé par le fait que l'électrode (40) se trouve dans un manchon d'arrivée (9) partant du raccord (10) à matière.
15. Pistolet de pulvérisation électrostatique selon l'une des revendications 11 à 14, caractérisé par le fait que l'électrode (41) se trouve dans un canal (23) de passage d'air, parcourant le second groupe structurel (25).
16. Pistolet de pulvérisation électrostatique selon l'une des revendications 11 à 15, caractérisé par le fait que la distance (B), comprise entre l'électrode (40, 41) prévue au minimum et la face extrême (53) de la zone de séparation (3), est plus grande que le trajet d'éclatement d'étincelles.
17. Pistolet de pulvérisation électrostatique selon l'une des revendications 11 à 15, caractérisé par le fait que la distance (A) séparant l'électrode (40) du raccord (10) à matière, dans le canal de passage de matière, est plus grande que le trajet d'éclatement d'étincelles.
18. Pistolet de pulvérisation électrostatique selon l'une des revendications 11 à 17, caractérisé par le fait que la distance (C) séparant l'électrode (41), dans le canal de passage d'air, d'une soupape d'étranglement (72) installée à proximité de la poignée, est plus grande que le trajet d'éclatement d'étincelles.
EP86117181A 1985-12-23 1986-12-10 Pistolet de pulvérisation électrostatique Expired EP0227992B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117181T ATE46459T1 (de) 1985-12-23 1986-12-10 Elektrostatische spruehpistole.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3545885A DE3545885C1 (de) 1985-12-23 1985-12-23 Elektrostatische Spruehpistole
DE3545885 1985-12-23

Publications (3)

Publication Number Publication Date
EP0227992A2 EP0227992A2 (fr) 1987-07-08
EP0227992A3 EP0227992A3 (en) 1987-12-09
EP0227992B1 true EP0227992B1 (fr) 1989-09-20

Family

ID=6289445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117181A Expired EP0227992B1 (fr) 1985-12-23 1986-12-10 Pistolet de pulvérisation électrostatique

Country Status (7)

Country Link
US (1) US4752034A (fr)
EP (1) EP0227992B1 (fr)
JP (1) JPS62155955A (fr)
AT (1) ATE46459T1 (fr)
BR (1) BR8606378A (fr)
DE (1) DE3545885C1 (fr)
ES (1) ES2010660B3 (fr)

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US8770496B2 (en) 2008-03-10 2014-07-08 Finishing Brands Holdings Inc. Circuit for displaying the relative voltage at the output electrode of an electrostatically aided coating material atomizer
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US4441656A (en) * 1982-01-29 1984-04-10 J. Wagner Ag Electrostatic disabling switch for electrostatic spray guns
ES517085A0 (es) * 1982-11-03 1983-10-16 Fusco Lupo Jose De Perfeccionamientos introducidos en pistolas electrostaticas.
DE3402945C2 (de) * 1984-01-28 1986-07-03 Ransburg-Gema AG, St. Gallen Elektrostatische Sprühpistole zum Sprühbeschichten
DE3412507A1 (de) * 1984-04-03 1985-10-17 J. Wagner AG, Altstätten Elektrostatische handspritzpistole
US4598871A (en) * 1984-05-10 1986-07-08 Nordson Corporation Multiple process electrostatic spray gun having integral power supply
US4645151A (en) * 1985-05-20 1987-02-24 Nordson Corporation Cable and connection apparatus for electrostatic powder guns

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4141663A1 (de) * 1991-12-17 1993-06-24 Wagner Int Elektrostatische pulver-beschichtungspistole

Also Published As

Publication number Publication date
JPH0511510B2 (fr) 1993-02-15
EP0227992A2 (fr) 1987-07-08
EP0227992A3 (en) 1987-12-09
ES2010660B3 (es) 1989-12-01
DE3545885C1 (de) 1993-03-04
US4752034A (en) 1988-06-21
BR8606378A (pt) 1987-10-13
ATE46459T1 (de) 1989-10-15
JPS62155955A (ja) 1987-07-10

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