EP0645192B1 - Sprühpistole zur elektrostatischen Sprühbeschichtung von Gegenständen - Google Patents

Sprühpistole zur elektrostatischen Sprühbeschichtung von Gegenständen Download PDF

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Publication number
EP0645192B1
EP0645192B1 EP19940500160 EP94500160A EP0645192B1 EP 0645192 B1 EP0645192 B1 EP 0645192B1 EP 19940500160 EP19940500160 EP 19940500160 EP 94500160 A EP94500160 A EP 94500160A EP 0645192 B1 EP0645192 B1 EP 0645192B1
Authority
EP
European Patent Office
Prior art keywords
barrel
spray gun
gun
grip
tubular
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
EP19940500160
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English (en)
French (fr)
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EP0645192A2 (de
EP0645192A3 (de
Inventor
José De Fusco Lupo
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Individual
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Individual
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Publication date
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Publication of EP0645192A2 publication Critical patent/EP0645192A2/de
Publication of EP0645192A3 publication Critical patent/EP0645192A3/de
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Publication of EP0645192B1 publication Critical patent/EP0645192B1/de
Anticipated expiration legal-status Critical
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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

  • This invention relates to a spray gun for electrostatic spray coating, namely for a powder coating material, of the type which comprises a gun barrel ended in a replaceable nozzle, and a grip or supporting member, whose barrel gun integrates a high voltage generator, constituted by a voltage multiplying circuit and a transformer, and a duct, generally axial, for the coating material circulation, a material such as powder paint driven by a pressurized fluid, which extends along said gun barrel and grip or support, formed by several coupled tubular lengths, which may be detached and replaceable, to make production tasks easier (more plain molding of the gun body in electrically insulating material), cleaning, servicing and repair and, namely making easier the change of colour of the paint used, said spray gun embodying likewise electrodes connected to said high voltage generator and interposed to the passage of the product to spray.
  • a gun of said characteristics appears disclosed in the utility model n o 264,765 owned by the applicant, whose main and more significant characteristic lays in allowing a quick mounting and dismounting, with the possibility of replacing the main elements should any fault arise.
  • the voltage multiplying circuit and the transformer are formed by means of modules which are independent and replaceable, which are housed in the interior of a tubular body or housing which constitutes the gun barrel.
  • the duct for impelling the powder may likewise be detached and is formed of two replaceable tubular elements, which are coupled through an elbow which extends along said gun barrel and the grip, respectively.
  • the voltage multiplying circuit is constituted by an insulating cylindric block which is axially socketed in a housing of the housing-barrel, stopping in an end narrowing of said housing through which it sets an electrical connection by means of contact stems with the electrodes, it results that in said connection area as the air always remains trapped and because of the high voltage existing there, there is the risk that said contact stems are corroded, with a further defaulting passage of the current (sparkling) which, with time can cause that the electrically insulating housing has a hole, of a smaller thickness at such end part of the barrel, setting the assembly out of order.
  • the gun with a first part having the shape of a grip or supporting member comprising same elements: oscillating circuit, transformer and means for connection of an oscillating circuit to an external power supply and the connection means of the duct for the passage of the coating material impelled by pressurized air to a particle feeding external device, and to a second part which comprises the barrel with the voltage multiplying circuit, the electrodes and the spraying nozzle, said two parts being mechanically and electrically connected to constitute an operating assembly.
  • This invention tries to eliminate the drawbacks of above disclosed guns and for such aim, it proposes an execution of at least the voltage multiplying circuit and, in general, also of the transformer, forming a whole, embedded within an insulating material block constituting the barrel and whose block is detachably related to a body acting as a support, which is extended in a portion having the shape of a grip or of a supporting member.
  • the gun for electrostatic spray object of the invention including all the features of mentioned EP-A-110753 according to the preamble of claim 1 is characterized in that it includes a tubular section element, acting as support of the barrel, which is laterally extended in a portion which continues in turn adopting the shape of a grip or like a supporting member to an automatic handler element, said tubular section element being designed to receive tightly inserted only a rear part of the barrel, having a slightly smaller section, lengthwise delimited by an annular step and ended by an end configuration adapted to allow to fasten a detachable part which keeps linked the two barrel and support bodies.
  • Said tubular section element has at its lateral extension portion, passageways for arranging through them the ducts of air and powder circulation, low voltage supply to the transformer and an additional air flow.
  • the disclosed electrostatic spray gun is composed of a tubular section element -6-, acting as support of the barrel body -1- which laterally extends in a portion -7- which, in turn, is continued by a grip -10- (figure 2) or in a supporting member -11- (figure 3) fastened to an automatic handler member not represented and said tubular section element -6-receives , tightly set, a rear part --5- of the barrel, having a slightly smaller section, lengthwise delimited by an annular step -18- and topped by an end configuration -19- adapted to allow fastening a detachable part -8- which keeps linked the two bodies support and barrel as shown in figures 2 and 3.
  • the barrel body -1- is ended at its front part in a nozzle -2- having a spray oblong hole -3-, locked by a threaded sleeve -4-, and said barrel houses, embedded within its body, formed by an insulating material block, a high voltage generator which comprises a voltage multiplying circuit -12- and a transformer -13- around a centering core -29-, and a duct -14- for the circulation of the coating material impelled by a fluid such as pressurized air, which axially extends along said barrel -1- and the grip -10- or supporting member -11-, and an electrode -17- interposed to the passage of the product to electrostatically spray and which is protruding at the front end of the nozzle -2-.
  • a high voltage generator which comprises a voltage multiplying circuit -12- and a transformer -13- around a centering core -29-, and a duct -14- for the circulation of the coating material impelled by a fluid such as pressur
  • the duct -14- is formed by two lengths -15- and -16- detachable and replaceable associated to an elbow -28- fixed in the interior of the body -1- and supported by a block -27- according to the well known structure disclosed in the mentioned utility model n o 264,765.
  • the voltage multiplying circuit -12- is electrically connected through an electric conductor -45-, resistor -30- and a connector-stem -32- which crosses a ring -31- auxiliary to an electrode -17- located within an hollow rod -33-, locked by a ring -37- and with a sealing gasket -38-, said rod -33- bearing the electrode possesses at its end part a centering socket -43- in electrically insulating material.
  • the hollow rod -33- shows at a base portion a first radial duct -35- for the passage of an electric conductor which connects the connector -32-to the electrode -17- and a second duct -36- to which converges a duct -21- having a smaller passage than the -14- for circulation of coating material and impelling fluid, for the circulation of an additional air flow.
  • Said duct -21- comprises a first length -22- which spreads along the barrel and is continued by a length -23-, advantageously flexible, adapted to pass through the grip -10- section (locked to the grip by a clamp -26-) or through the supporting member -11-, by suitable passageways arranged at the portion -7- which laterally extends the tubular section element -6-, making the dismounting of the body -1- easier.
  • This duct --21- can be formed as well as the duct -14- by several coupled, dismountable lengths, associated to a connecting elbow -27- set within the body -1-.
  • the rear portion of the barrel comprises a cylindric terminal part -19- having a smaller section, which is internally threaded and the part -8- which keeps the two support -6- and barrel -1- bodies is formed by a plug having an externally threaded core -9- (see figure 1) which is inserted threaded in said portion -19- and is, in turn, introduced in the mouthpiece of the tubular section element -6-, embodying a perimetral flange -20- which rests against the end of said tubular section element -6-, linking it to the barrel body -1-.
  • the height of the step -18- which delimitates the rear portion -5- of the barrel -1- inserted in the tubular section element -6- is coincident with the thickness of its wall, in such a way that the surface of the front part of the barrel -1-remains level with the surface of the support tubular element -6-.
  • the grip -10- section comprises a front portion -24- corresponding to the part where the push-button -25- or driving latch is mounted, which is constituted by a part detachably linked to the sides of the grip -10-, by locking means -39- ( screws and nuts), adapted to be coupled with tongues and grooves with the rest of the grip, allowing a direct access to the interior of said grip -10-, the tasks or servicing, repair, withdrawal and replacement of the tube -16- etc. are so made easier.
  • the support tubular element -6- of the barrel -1- shows at its higher part, near to its back, an appendage hook-shaped -47-, to hang the gun.
  • the embodiment illustrated in the figure 4 only differs from the example of the figure 2 by the use of a different nozzle -41-, ended in a circular opening embodying a deflector -42- associated with possibility of lengthwise setting to the end of the hollow rod -33-, axially to which spreads the electrode -17- for the electrostatic loading of the particles.
  • the holes -40- are seen to lock such supporting member to an automatic handling tool.
  • the tubular section element -6- will show a passageway -45- for the arrangement through it of a power supply cable -46- which continues by the conductor -44- up to the transformer -13-, which possesses a centering central core -29-.
  • the barrel may include only embedded in its body the voltage multiplying circuit -12-, while the transformer -13- can be constituted by a module which can be coupled to a socket-outlet in the interior of a housing of the barrel and connectable to said circuit -13-, bearing in mind that the outlet voltage of this transformer of about 3500 V in said area, having a significant thickness of the wall, is less critical than in other zones of the spray gun.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (9)

  1. Spritzpistole zum elektrostatischen Spritzlackieren von Gegenständen, geeignet für ein Pulverlackmaterial, welche einen Pistolenlauf (1), der in eine austauschbare Düse (2) endet, und einen Griff oder Stütze (10, 11), welcher Pistolenlauf einen Hochspannungsgenerator, bestehend aus einer Spannungs- vervielfachungsschaltung (12) und einem Transformator sowie eine in der Regel axiale Leitung (14) zur Zufuhr des Lackmaterials, wie z.B. ein Pulverlack, der mittels einer unter Druck stehenden Flüssigkeit zerstäubt wird, die sich längs dem Pistolenlauf und dem Griff bzw. der Stütze erstreckt und aus mehreren gekuppelten röhrenförmigen Längsstücken (15, 16) besteht, die abnehm- und austauschbar sind, und einige Elektroden (17) aufweist, die an den Hochspannungsgenerator angeschlossen und im Kanal des zu verspritzenden Produkts angeordnet sind, umfasst dadurch gekennzeichnet, daß die Spritzpistole aus einem Element (6) in Form eines röhrenförmigen Abschnitts besteht, das als Stütze des Laufkörpers (1) dient und durch ein Teilstück (7) seitlich verlängert ist, das seinerseits durch einen Griff (10) bzw. ein Stützelement (11) weitergeführt wird, das an einem automatischen Hantierelement befestigt ist, wobei das Element in Form eines röhrenförmigen Abschnitts (6) beim festen Aufstecken ein Hinterteil (5) des Laufes (1) aufnimmt, der einen etwas kleineren Querschnitt aufweist und in Längsrichtung durch einen ringförmigen Absatz (18) begrenzt und mit einem Endteil (19) bedeckt ist, das so gestaltet ist, daß daran ein abnehmbares Teil (8) befestigt werden kann, der die zwei Körper, und zwar das Element in Form eines röhrenförmigen Abschnitts (6) und den Pistolenlauf (1), miteinander verbindet, wobei das Element in Form eines röhrenförmigen Abschnitts (6) einige Durchführungen aufweist, durch die einige Leitungen zur Zufuhr von Pulver und Flüssigkeit (16) sowie elektrischem Strom (46) gelegt werden können.
  2. Spritzpistole nach Patentanspruch 1, dadurch gekennzeichnet, daß das Hinterteil (5) des Laufes (1) ein zylindrisches Endteil (19) mit einem kleineren Querschnitt mit Innengewinde umfaßt und der Teil (8), der die zwei Körper, und zwar das Element in Form eines röhrenförmigen Abschnitts (6) und den Lauf (1), miteinander verbindet , aus einem Stopfen (8) mit Außengewindekern (9) besteht, der in Teil (19) eingeschraubt wird und seinerseits in das Mundstück des röhrenförmigen Elements (6) eingeführt wird, wobei Teil (8) einen äußeren Flansch (20) beinhaltet, der auf dem Ende des röhrenförmigen Elements (6) aufsitzt und es so mit dem Körper des Laufes (1) verbindet.
  3. Spritzpistole nach Patentanspruch 1, dadurch gekennzeichnet, daß die Höhe des Absatzes (18), der das in das röhrenförmige Element (6) eingeführte Hinterteil (5) des Laufes (1) begrenzt, mit seiner Wandstärke so bemessen ist, daß die Oberfläche des Vorderteils des Laufes (1) und die Oberfläche der röhrenförmigen Stütze miteinander fluchten.
  4. Spritzpistole nach Patentanspruch 1, dadurch gekennzeichnet, daß die Spannungsvervielfacherschaltung (12) und der Transformator (13) beide in einen den Laufkörper (1) darstellenden elektrisch isolierenden Block eingebettet sind.
  5. Spritzpistole nach Patentanspruch 1, dadurch gekennzeichnet, daß sie eine Leitung (21) mit einem kleineren Querschnitt als der mit (14) bezeichnete zur Zufuhr des Lackmaterials und der unter Druck stehenden Flüssigkeit aufweist, die zur Zufuhr von einem zusätzlichen Luftstrom in Richtung auf einen am Vorderende des Laufes (1), an dem eine Elektrode (17) angebracht ist, gelegenen Abschnitt dient, wobei die Leitung (21) aus einem röhrenförmigen Element (22) besteht, das sich längs des Laufes (1) erstreckt und mit einem Längsstück (23) verlängert ist, das in der Lage ist, durch den Griffabschnitt (10) bzw. das Stützelement (11) hindurchgeführt zu werden.
  6. Spritzpistole nach Patentanspruch 5, dadurch gekennzeichnet, daß das Längsstück (23) aus einer biegsamen Leitung besteht.
  7. Spritzpistole nach Patentanspruch 5, dadurch gekennzeichnet, daß das Längsstück (23) aus einer austauschbaren Leitung besteht, die an das röhrenförmige Element (22) über ein abgewinkeltes Element angeschlossen ist.
  8. Spritzpistole nach Patentanspruch 1, dadurch gekennzeichnet, daß der Griffabschnitt (10) ein Vorderteil (24) aufweist, der dem Teil entspricht, auf dem der Auslöseabzug (25) bzw. der Abzugsriegel aufgebaut ist, der aus einem mit den Seitenteilen des Griffs (10) abnehmbar verbundenen Teil und einem Verriegelungsmittel (39) besteht, die so gestaltet sind, daß sie mit dem Rest des Griffes (10) über Nuten und Federn einrasten.
  9. Spritzpistole nach Patentanspruch 1, dadurch gekennzeichnet, daß das Element in Form eines röhrenförmigen Abschnitts (6) des Laufes (1) an seinem höhergelegenen Teil nahe seinem Rückende mit einem hakenförmigen Fortsatz (47) zum Aufhängen der Spritzpistole ausgestattet ist
EP19940500160 1993-09-29 1994-09-28 Sprühpistole zur elektrostatischen Sprühbeschichtung von Gegenständen Expired - Lifetime EP0645192B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9302572U 1993-09-29
ES9302572U ES1025823Y (es) 1993-09-29 1993-09-29 Pistola para pulverizacion electrostastica de objetos.

Publications (3)

Publication Number Publication Date
EP0645192A2 EP0645192A2 (de) 1995-03-29
EP0645192A3 EP0645192A3 (de) 1995-09-13
EP0645192B1 true EP0645192B1 (de) 1999-05-12

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Application Number Title Priority Date Filing Date
EP19940500160 Expired - Lifetime EP0645192B1 (de) 1993-09-29 1994-09-28 Sprühpistole zur elektrostatischen Sprühbeschichtung von Gegenständen

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EP (1) EP0645192B1 (de)
DE (1) DE69418407D1 (de)
ES (1) ES1025823Y (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69603751T2 (de) * 1995-12-22 2000-04-06 G Lyle Habermehl Kraftbetriebenes handwerkzeug mit ein, ausschalter in hinterem teil eines ergonomischen handgriffs
DE19838280A1 (de) * 1998-08-22 2000-02-24 Itw Gema Ag Sprühpistole zum Beschichten von Objekten
US8746597B2 (en) 2009-09-21 2014-06-10 E-Mist Innovations, Inc. Electrostatic spray system
DE102019105244A1 (de) * 2019-03-01 2020-09-03 Gema Switzerland Gmbh Heckschale für eine sprühpistole sowie sprühpistole mit einer solchen heckschale

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904437A1 (de) * 1989-02-14 1990-08-16 Gema Ransburg Ag Spruehpistole zum elektrostatischen spruehbeschichten

Also Published As

Publication number Publication date
ES1025823U (es) 1994-02-01
ES1025823Y (es) 1994-08-16
EP0645192A2 (de) 1995-03-29
DE69418407D1 (de) 1999-06-17
EP0645192A3 (de) 1995-09-13

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