EP1238709A2 - Powder spray pistol for coating powder - Google Patents

Powder spray pistol for coating powder Download PDF

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Publication number
EP1238709A2
EP1238709A2 EP01128493A EP01128493A EP1238709A2 EP 1238709 A2 EP1238709 A2 EP 1238709A2 EP 01128493 A EP01128493 A EP 01128493A EP 01128493 A EP01128493 A EP 01128493A EP 1238709 A2 EP1238709 A2 EP 1238709A2
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EP
European Patent Office
Prior art keywords
powder
tube
spray gun
gun according
powder 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.)
Granted
Application number
EP01128493A
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German (de)
French (fr)
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EP1238709B1 (en
EP1238709A3 (en
Inventor
Hanspeter Michael
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Gema Switzerland GmbH
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Gema Switzerland GmbH
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Publication of EP1238709A2 publication Critical patent/EP1238709A2/en
Publication of EP1238709A3 publication Critical patent/EP1238709A3/en
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Publication of EP1238709B1 publication Critical patent/EP1238709B1/en
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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
    • 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
    • B05B5/16—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

Definitions

  • the invention relates to a powder spray gun for coating powder according to the preamble of claim 1.
  • the invention relates to a powder spray gun for Coating powder containing at least one high-voltage electrode for electrostatic powder charging, an electric powder tube insulating material, which is in the Powder spray gun extends, a connecting pipe made of electrically insulating Material, the front end of which is with the rear end of the powder tube is connected and the rear end with a powder hose is pluggable, a socket made of electrically conductive material, which surrounds the powder tube in a sealing manner and can be connected to earth potential Dissipation of electrical charges.
  • Fig. 3 of the drawings attached here shows a hose-powder tube connection this type of known powder spray gun for Coating powder.
  • a socket 6 is made of electrically conductive Aluminum attached and glued to the powder tube.
  • the socket has on her front end an external thread 8 for screwing into a Threaded hole in the powder spray gun.
  • a connecting pipe 10 or Connection nipple is in the rear end portion 12 of the socket 6, which over the rear tube end of the powder tube 4 protrudes, inserted and through sealed an O-ring 14 against the socket 6. From the socket 6 protruding rear end portion of the connecting pipe 10 is a Powder hose 16 attachable.
  • the socket 6 is electrical with earth potential connectable.
  • the socket 6, which consists of electrically conductive material, has of one or more high voltage electrodes 18 which are only schematic indicated powder spray gun 5 a distance of, for example, 330 mm. This makes the gun safe in terms of electrical safety (electricity and Arcing on an operator) is fine, but there is a danger in extreme situations that the electrical voltage is present the high voltage electrode 18 collapses when metallic powder (Coating powder containing metal powder or metal particles) as Coating powder is used to coat objects. at different types of metallic powder accumulate in an undesirable manner Metal particles on the inner walls of the powder tube 2, the connecting tube 10 and the powder hose 16.
  • the high voltage electrode 18 (one or more) is close to or in a mouthpiece 20 or atomizer nozzle, at which the coating powder 22 atomizes and towards coating object is sprayed.
  • the object of the invention is to achieve a collapse of the High voltage of the at least one high voltage electrode Powder spray gun to be easily avoided even when using metallic powder is used as coating powder.
  • a high voltage powder spray gun is in accordance with the invention characterized in that the front end portion of the connecting pipe and the rear end portion of the powder tube axially overlapping each other and are hermetically sealed so far that they are electrically connected between them insulating isolating section to avoid electrical currents from your Form inside to its outside, and that the bushing extends axially up to or via the outer overlap end of the connection pipe-powder pipe connection extends to discharge electrical charges, if any outer overlap end between the connecting pipe and the powder pipe emerge despite the isolation gap.
  • front means in the powder flow direction downstream
  • rear upstream in the powder flow direction. behind thus means on the left in FIG. 1 and on the bottom in FIG. 2. ahead means on the right in FIG. 1 and on the top in FIG. 2.
  • the high voltage powder spray guns 30 and 30 shown in FIGS. 30-2 according to the invention for coating powder in particular for metallic powder (Metal powder or in particular powder containing metal particles, e.g. Plastic powder) have at least one high-voltage electrode 32 in the Near or in a spray opening 34 for electrostatic charging of Coating powder 36.
  • the coating powder 36 flows in the Powder spray gun at least in its initial section through a powder tube 38 made of electrically insulating material, which from a Gun inlet side 40 protrudes.
  • a bushing 42 is on the powder tube 38 (Screw-in part) made of electrically conductive material, e.g. B. aluminum, airtight attached and on its inner circumferential surface by adhesive with the Glued outer peripheral surface of the powder tube 38.
  • the one made of metal Bushing 42 has an external thread 44 at its front end section which they into an internal thread 46 of a holder 48 of the powder spray gun 30 is screwed in.
  • the electrically conductive socket 42 can be connected to earth potential 50, for example by an earth screw or a metal bracket 52, which is pivotally arranged on the holder 48 and into an outer circumferential groove 54 can be swung in or swung out.
  • a connecting tube 56 and the powder tube 38 are axially fitted into one another, preferably inserted into each other.
  • the connecting pipe 56 or connecting nipple made of electrically insulating material, e.g. B. plastic has a front Pipe section 58, which is airtight on a rear end portion 60 of the Powder tube 38 is attached.
  • the front pipe section 58 of the Connection tube 56 protrudes axially forward into an annular space between the Powder tube 38 and a rear end portion 62 with a larger diameter the sleeve 42 is formed, and is therein with the sleeve 42 axially and radially connected is.
  • the front end section 58 of the connecting pipe 56 be provided with an external thread 64 which fits into an internal thread 66 the socket 42 is screwed.
  • Another mounting option would be an adhesive or a snap connection.
  • the rear end portion 60 of the powder tube 38 protrudes axially rearward from the Socket 42 out.
  • the rear powder tube end 69 sits on an annular Paragraph 68, which in the connecting tube 56 between one in diameter larger, front bore section 70 receiving the powder tube 38 and a relatively smaller diameter rear bore section 72 of the connecting tube 56 is formed.
  • the powder tube 38 protrudes rearward by a tube length 74 over the rear end of the electrically conductive socket 42 out. Between the rear powder tube end 69 of the electrically insulating material existing powder tube 38 and the front end 78 of the also electrically insulating material existing connecting tube 56 is through whose axial overlap area is sufficiently long electrically isolating insulating section 76 is formed, which prevents electrical Charges from the powder tube 38 to the electrically conductive and grounded Socket 50 can drain.
  • the socket 42 extends axially over the outer overlap end 78 (front connecting pipe end 78) of the Connection pipe-powder pipe connection for picking up and discharging electrical charges, if such despite the long electrical insulation distance 76 at the outer overlap end 78 between the connecting pipe 56 and the Powder tube 38 should emerge.
  • the powder hose 84 consists of electrically insulating material.
  • the critical area which is beyond the outer Overlap end 88 between the front hose end 86 and the Connection tube 56 extends through a shielding jacket 90 with a radial Safety distance to avoid arcing, which is made of electrically conductive material and on its front End is electrically connected to the socket 42 connectable to earth 50.
  • the electrically conductive shielding jacket 90 is preferably axially resilient compressible, so that to attach the powder hose 84 to the Connection tube 56, the rear end 92 of the shielding jacket 90 at least as far forward in the direction of the socket 42 as the Powder hose 84 must be plugged onto the connecting pipe 56.
  • the front end portion 94 is the shield shell 90 between the outer circumference of the connecting tube 56 and this overlapping rear end portion 62 of the socket 42 inserted, preferably clamped.
  • the front end portion 94 of the Shielding jacket 90 in the threads of the threads 64 and 66 this engage both parts. In this area, these parts can also be used together be glued.
  • the front end portion 94 of the shield shell 90 has one on the outer diameter of the front end portion 58 of the Connection tube 56 reduced diameter, while its rear End section 96 at least at the overlap end 88 of the connecting pipe powder hose connector has a larger inner diameter.
  • the Shielding jacket 90 is preferably a helical spring Compression spring, as shown in Fig. 1.
  • the high-voltage powder spray gun 30 shown schematically in FIG Coating powder can be either a "gun shape” or an elongated one Have shape, from the rear gun inlet side, the powder tube 38 axially protrudes.
  • the high voltage powder spray gun 30-2 can also "Gun shape" with a gun barrel 100 and with one down protruding pistol grip 102, from its lower end if this is the gun inlet side 40, the rear end portion 60 of the powder tube 38 protrudes.
  • Fig. 1 corresponding parts are in Fig. 2 with the same Provide reference numbers and are not described again.
  • Fig. 2 shows that the high voltage for the high voltage electrode 32 of the Powder spray gun 30-2, instead of being supplied externally, by one in integrated high voltage generator 104 can be generated, which An electrical low voltage can be supplied via a cable 106.
  • Cable 106 may also include an electrical lead Grounding of the socket 42 (preferably a screwable part into the gun) Aluminum).
  • a compressed air connection 108 for supplying compressed air to the high voltage electrode 32 and a trigger 110 for manual Switching on and switching off the gun operation should be provided.

Abstract

The working tip of the pistol incorporates a high voltage electrode (32) centrally mounted in the spray nozzle (34) to apply an electrostatic charge to the stream of powder (36). The powder passes through a tube (38) held in an earthed (50) sleeve (42). There is an insulated section (76) upstream of the sleeve. A screening coil (90) surrounds the end of the hose (84) for the powder.

Description

Die Erfindung betrifft eine Pulversprühpistole für Beschichtungspulver gemäß dem Oberbegriff von Anspruch 1.The invention relates to a powder spray gun for coating powder according to the preamble of claim 1.

Demgemäß betrifft die Erfindung eine Pulversprühpistole für Beschichtungspulver, enthaltend mindestens eine Hochspannungs-Elektrode zur elektrostatischen Pulveraufladung, ein Pulverrohr aus elektrisch isolierendem Material, welches sich auf einer Pistoleneingangsseite in die Pulversprühpistole erstreckt, ein Anschlußrohr aus elektrisch isolierendem Material, dessen vorderes Ende mit dem hinteren Ende des Pulverrohres verbunden ist und dessen hinteres Ende mit einem Pulverschlauch zusammensteckbar ist, eine Buchse aus elektrisch leitendem Material, welche das Pulverrohr dichtend umgibt und an Erdpotential anschließbar ist zum Ableiten von elektrischen Ladungen. Accordingly, the invention relates to a powder spray gun for Coating powder containing at least one high-voltage electrode for electrostatic powder charging, an electric powder tube insulating material, which is in the Powder spray gun extends, a connecting pipe made of electrically insulating Material, the front end of which is with the rear end of the powder tube is connected and the rear end with a powder hose is pluggable, a socket made of electrically conductive material, which surrounds the powder tube in a sealing manner and can be connected to earth potential Dissipation of electrical charges.

Fig. 3 der hier beigefügten Zeichnungen zeigt eine Schlauch-Pulverrohr-Verbindung dieser Art von einer bekannten Pulversprühpistole für Beschichtungspulver. Auf den hinteren Endabschnitt 2 eines Pulverrohres 4, welches sich vom Anschlußende einer Pulversprühpistole 5 in diese Pulversprühpistole 5 erstreckt, ist eine Buchse 6 aus elektrisch leitendem Aluminium aufgesteckt und am Pulverrohr angeklebt. Die Buchse hat an ihrem vorderen Ende ein Außengewinde 8 zum Einschrauben in eine Gewindebohrung in der Pulversprühpistole. Ein Anschlußrohr 10 oder Anschlußnippel ist in den hinteren Endabschnitt 12 der Buchse 6, welche über das hintere Rohrende des Pulverrohres 4 hinausragt, eingesteckt und durch einen O-Ring 14 gegen die Buchse 6 abgedichtet. Auf den aus der Buchse 6 herausragenden hinteren Endabschnitt des Anschlußrohres 10 ist ein Pulverschlauch 16 aufsteckbar. Die Buchse 6 ist mit Erdpotential elektrisch verbindbar. Die Buchse 6, welche aus elektrisch leitendem Material besteht, hat von einer oder mehreren Hochspannungs-Elektroden 18 der nur schematisch angedeuteten Pulversprühpistole 5 einen Abstand von beispielsweise von 330 mm. Dadurch ist die Pistole bezüglich elektrischer Sicherheit (Strom- und Funkenüberschläge auf eine Bedienungsperson) zwar in Ordnung, jedoch besteht bei extremen Situationen die Gefahr, dass die elektrische Spannung an der Hochspannungs-Elektrode 18 zusammenbricht, wenn Metallic-Pulver (Metallpulver oder Metallpartikel enthaltendes Beschichtungspulver) als Beschichtungspulver verwendet wird zum Beschichten von Gegenständen. Bei verschiedenen Metallic-Pulversorten lagern sich in unerwünschter Weise Metallpartikel an den Innenwänden des Pulverrohres 2, des Anschlußrohres 10 und des Pulverschlauches 16 ab. Diese abgelagerten Metallpartikel bilden einen elektrisch leitfähigen Film, durch welchen die Hochspannung zwischen den einander benachbarten Stirnseiten 15, 17 des Pulverrohres 4 und des Anschlußrohres 10 zu der Buchse 6 und damit auf Erdpotential abfließen kann. Dieser Effekt ist um so schlimmer, je näher die Hochspannungs-Elektrode 18 bei der Buchse 6 ist. Verantwortlich für das Zusammenbrechen der Hochspannung ist auch der Pulverstrom selbst, da dieser zu einem gewissen Grad auch leitfähig ist. Die Hochspannungs-Elektrode 18 (eine oder mehrere) befindet sich nahe bei oder in einem Mundstück 20 oder einer Zerstäuberdüse, an welcher das Beschichtungspulver 22 zerstäubt und auf ein zu beschichtendes Objekt gesprüht wird.Fig. 3 of the drawings attached here shows a hose-powder tube connection this type of known powder spray gun for Coating powder. On the rear end section 2 of a powder tube 4, which is from the connection end of a powder spray gun 5 in this Powder spray gun 5 extends, a socket 6 is made of electrically conductive Aluminum attached and glued to the powder tube. The socket has on her front end an external thread 8 for screwing into a Threaded hole in the powder spray gun. A connecting pipe 10 or Connection nipple is in the rear end portion 12 of the socket 6, which over the rear tube end of the powder tube 4 protrudes, inserted and through sealed an O-ring 14 against the socket 6. From the socket 6 protruding rear end portion of the connecting pipe 10 is a Powder hose 16 attachable. The socket 6 is electrical with earth potential connectable. The socket 6, which consists of electrically conductive material, has of one or more high voltage electrodes 18 which are only schematic indicated powder spray gun 5 a distance of, for example, 330 mm. This makes the gun safe in terms of electrical safety (electricity and Arcing on an operator) is fine, but there is a danger in extreme situations that the electrical voltage is present the high voltage electrode 18 collapses when metallic powder (Coating powder containing metal powder or metal particles) as Coating powder is used to coat objects. at different types of metallic powder accumulate in an undesirable manner Metal particles on the inner walls of the powder tube 2, the connecting tube 10 and the powder hose 16. Form these deposited metal particles an electrically conductive film through which the high voltage between the mutually adjacent end faces 15, 17 of the powder tube 4 and Connection pipe 10 to the socket 6 and thus can flow to earth potential. The closer the high-voltage electrode 18 is, the worse this effect is at socket 6 is. Responsible for the collapse of the The powder stream itself is also high voltage, since it leads to a certain Degree is also conductive. The high voltage electrode 18 (one or more) is close to or in a mouthpiece 20 or atomizer nozzle, at which the coating powder 22 atomizes and towards coating object is sprayed.

Ähnliche Hochspannungs-Pulversprühpistolen für Beschichtungspulver sind aus der US 5 022 590 (EP 0 383 031 B1) und US 4 196 465 (DE 28 51 006 C2) bekannt.Similar high voltage powder spray guns are for coating powder from US 5 022 590 (EP 0 383 031 B1) and US 4 196 465 (DE 28 51 006 C2) known.

Durch die Erfindung soll die Aufgabe gelöst werden, ein Zusammenbrechen der Hochspannung der mindestens einen Hochspannungs-Elektrode der Pulversprühpistole auf einfache Weise auch dann zu vermeiden, wenn Metallic-Pulver als Beschichtungspulver verwendet wird.The object of the invention is to achieve a collapse of the High voltage of the at least one high voltage electrode Powder spray gun to be easily avoided even when using metallic powder is used as coating powder.

Diese Aufgabe wird gemäß der Erfindung durch die kennzeichnenden Merkmale von Anspruch 1 gelöst.This object is achieved according to the invention by the characterizing Features of claim 1 solved.

Demgemäß ist eine Hochspannungs-Pulversprühpistole gemäß der Erfindung dadurch gekennzeichnet, dass der vordere Endabschnitt des Anschlußrohres und der hintere Endabschnitt des Pulverrohres einander axial überlappend und luftdicht so weit ineinander gefügt sind, dass sie zwischen sich eine elektrisch isolierende Isolierstrecke zur Vermeidung von elektrischen Strömen von ihrer Innenseite zu ihrer Außenseite bilden, und dass die Buchse sich axial bis an oder über das äußere Überlappungsende der Anschlußrohr-Pulverrohr-Verbindung erstreckt, zur Ableitung von elektrischen Ladungen, falls solche am äußeren Überlappungsende zwischen dem Anschlußrohr und dem Pulverrohr trotz der Isolierstrecke austreten.Accordingly, a high voltage powder spray gun is in accordance with the invention characterized in that the front end portion of the connecting pipe and the rear end portion of the powder tube axially overlapping each other and are hermetically sealed so far that they are electrically connected between them insulating isolating section to avoid electrical currents from your Form inside to its outside, and that the bushing extends axially up to or via the outer overlap end of the connection pipe-powder pipe connection extends to discharge electrical charges, if any outer overlap end between the connecting pipe and the powder pipe emerge despite the isolation gap.

Weitere Merkmale der Erfindung sind in den Unteransprüchen enthalten. Further features of the invention are contained in the subclaims.

Die Erfindung wir im folgenden mit Bezug auf die beiliegenden Zeichnungen anhand einer bevorzugten Ausführungsform als Beispiel beschrieben. In den Zeichnungen zeigen

  • Fig. 1 schematisch im Axialschnitt Pulveranschlußelemente einer Hochspannungs-Pulversprühpistole für Beschichtungspulver gemäß der Erfindung,
  • Fig. 2 schematisch eine Seitenansicht einer besonderen Ausführungsform einer Pulversprühpistole nach der Erfindung mit den Anschlußelementen von Fig. 1.
    • The invention is described below with reference to the accompanying drawings using a preferred embodiment as an example. Show in the drawings
  • 1 schematically, in axial section, powder connection elements of a high-voltage powder spray gun for coating powder according to the invention,
  • FIG. 2 schematically shows a side view of a special embodiment of a powder spray gun according to the invention with the connection elements from FIG. 1.

    • In der vorliegenden Beschreibung bedeuten "vorne" in Pulverströmungsrichtung stromabwärts, und "hinten" in Pulverströmungsrichtung stromaufwärts. Hinten bedeutet somit in Fig. 1 jeweils links, und in Fig. 2 jeweils unten. Vorne bedeutet in Fig. 1 jeweils rechts, und in Fig. 2 jeweils oben.In the present description, "front" means in the powder flow direction downstream, and "rear" upstream in the powder flow direction. behind thus means on the left in FIG. 1 and on the bottom in FIG. 2. ahead means on the right in FIG. 1 and on the top in FIG. 2.

    Die in den Fig. 1 und 2 gezeigten Hochspannungs-Pulversprühpistolen 30 bzw. 30-2 nach der Erfindung für Beschichtungspulver, insbesondere für Metallic-Pulver (Metallpulver oder insbesondere Metallpartikel enthaltendes Pulver, z. B. Kunststoffpulver) haben mindestens eine Hochspannungs-Elektrode 32 in der Nähe oder in einer Sprühöffnung 34 zum elektrostatischen Aufladen von Beschichtungspulver 36. Das Beschichtungspulver 36 strömt in der Pulversprühpistole mindestens in deren Anfangsabschnitt durch ein Pulverrohr 38 aus elektrisch isolierendem Material, welches aus einer Pistoleneingangsseite 40 herausragt. Auf das Pulverrohr 38 ist eine Buchse 42 (Einschraubteil) aus elektrisch leitendem Material, z. B. Aluminium, luftdicht aufgesteckt und an seiner Innenumfangsfläche durch Klebstoff mit der Außenumfangsfläche des Pulverrohres 38 verklebt. Die aus Metall bestehende Buchse 42 hat an ihrem vorderen Endabschnitt ein Außengewinde 44, durch welches sie in ein Innengewinde 46 eines Halters 48 der Pulversprühpistole 30 eingeschraubt ist.The high voltage powder spray guns 30 and 30 shown in FIGS. 30-2 according to the invention for coating powder, in particular for metallic powder (Metal powder or in particular powder containing metal particles, e.g. Plastic powder) have at least one high-voltage electrode 32 in the Near or in a spray opening 34 for electrostatic charging of Coating powder 36. The coating powder 36 flows in the Powder spray gun at least in its initial section through a powder tube 38 made of electrically insulating material, which from a Gun inlet side 40 protrudes. A bushing 42 is on the powder tube 38 (Screw-in part) made of electrically conductive material, e.g. B. aluminum, airtight attached and on its inner circumferential surface by adhesive with the Glued outer peripheral surface of the powder tube 38. The one made of metal Bushing 42 has an external thread 44 at its front end section which they into an internal thread 46 of a holder 48 of the powder spray gun 30 is screwed in.

    Die elektrisch leitende Buchse 42 ist an Erdpotential 50 anschließbar, beispielsweise durch eine Erdungsschraube oder einen Metallbügel 52, welcher am Halter 48 schwenkbar angeordnet ist und in eine Außenumfangsnut 54 einschwenkbar bzw. herausschwenkbar ist.The electrically conductive socket 42 can be connected to earth potential 50, for example by an earth screw or a metal bracket 52, which is pivotally arranged on the holder 48 and into an outer circumferential groove 54 can be swung in or swung out.

    Ein Anschlußrohr 56 und das Pulverrohr 38 sind axial ineinander gefügt, vorzugsweise ineinander gesteckt. Das Anschlußrohr 56 oder Anschlußnippel aus elektrisch isolierendem Material, z. B. Kunststoff, hat einen vorderen Rohrabschnitt 58, welcher luftdicht auf einen hinteren Endabschnitt 60 des Pulverrohres 38 aufgesteckt ist. Der vordere Rohrabschnitt 58 des Anschlußrohres 56 ragt axial nach vorne in einen Ringraum, der zwischen dem Pulverrohr 38 und einem im Durchmesser erweiterten hinteren Endabschnitt 62 der Buchse 42 gebildet ist, und ist darin mit der Buchse 42 axial und radial verbunden ist. Hierzu kann der vordere Endabschnitt 58 des Anschlußrohres 56 mit einem Außengewinde 64 versehen sein, welches in ein Innengewinde 66 der Buchse 42 eingeschraubt ist. Eine andere Befestigungsmöglichkeit wäre ein Verkleben oder eine Rastverbindung.A connecting tube 56 and the powder tube 38 are axially fitted into one another, preferably inserted into each other. The connecting pipe 56 or connecting nipple made of electrically insulating material, e.g. B. plastic has a front Pipe section 58, which is airtight on a rear end portion 60 of the Powder tube 38 is attached. The front pipe section 58 of the Connection tube 56 protrudes axially forward into an annular space between the Powder tube 38 and a rear end portion 62 with a larger diameter the sleeve 42 is formed, and is therein with the sleeve 42 axially and radially connected is. For this purpose, the front end section 58 of the connecting pipe 56 be provided with an external thread 64 which fits into an internal thread 66 the socket 42 is screwed. Another mounting option would be an adhesive or a snap connection.

    Der hintere Endabschnitt 60 des Pulverrohres 38 ragt axial nach hinten aus der Buchse 42 hinaus. Das hintere Pulverrohrende 69 sitzt auf einem ringförmigen Absatz 68, welcher im Anschlußrohr 56 zwischen einem im Durchmesser größeren, das Pulverrohr 38 aufnehmenden vorderen Bohrungsabschnitt 70 und einem relativ dazu im Durchmesser kleineren hinteren Bohrungsabschnitt 72 des Anschlußrohres 56 gebildet ist. The rear end portion 60 of the powder tube 38 protrudes axially rearward from the Socket 42 out. The rear powder tube end 69 sits on an annular Paragraph 68, which in the connecting tube 56 between one in diameter larger, front bore section 70 receiving the powder tube 38 and a relatively smaller diameter rear bore section 72 of the connecting tube 56 is formed.

    Das Pulverrohr 38 ragt um eine Rohrstücklänge 74 nach hinten über das hintere Ende der elektrisch leitenden Buchse 42 hinaus. Zwischen dem hinteren Pulverrohrende 69 des aus elektrisch isolierendem Material bestehenden Pulverrohres 38 und dem vorderen Ende 78 des ebenfalls aus elektrisch isolierendem Material bestehenden Anschlußrohres 56 ist durch deren axialen Überlappungsbereich eine ausreichend lange elektrisch isolierende Isolierstrecke 76 gebildet, welche verhindert, dass elektrische Ladungen aus dem Pulverrohr 38 zur elektrisch leitenden und geerdeten Buchse 50 abfließen können. Die Buchse 42 erstreckt sich axial über das äußere Überlappungsende 78 (vorderes Anschlußrohrende 78) der Anschlußrohr-Pulverrohr-Verbindung hinaus zum Aufnehmen und Ableiten von elektrischen Ladungen, falls solche trotz der langen elektrischen Isolierstrecke 76 am äußeren Überlappungsende 78 zwischen dem Anschlußrohr 56 und dem Pulverrohr 38 austreten sollten.The powder tube 38 protrudes rearward by a tube length 74 over the rear end of the electrically conductive socket 42 out. Between the rear powder tube end 69 of the electrically insulating material existing powder tube 38 and the front end 78 of the also electrically insulating material existing connecting tube 56 is through whose axial overlap area is sufficiently long electrically isolating insulating section 76 is formed, which prevents electrical Charges from the powder tube 38 to the electrically conductive and grounded Socket 50 can drain. The socket 42 extends axially over the outer overlap end 78 (front connecting pipe end 78) of the Connection pipe-powder pipe connection for picking up and discharging electrical charges, if such despite the long electrical insulation distance 76 at the outer overlap end 78 between the connecting pipe 56 and the Powder tube 38 should emerge.

    Da die elektrischen Hochspannungsladungen an der Grenze zwischen dem Pulverrohr 38 und dem Anschlußrohr 56 nicht mehr (im Gegensatz zum Stand der Technik) auf Erdpotential 50 abfließen können, kann sich die Hochspannung von der Hochspannungselektrode 32 durch den Pulverweg bis in den zur Pulverzufuhr dienenden Pulverschlauch 84 erstrecken, der auf den profilierten Außenumfang 80 des hinteren Endabschnittes 82 des Anschlußrohres 56 aufgesteckt ist. Der Pulverschlauch 84 besteht aus elektrisch isolierendem Material. Wenn der Pulverschlauch 84 ungenügend auf das Anschlußrohr 56 aufgesteckt ist, oder wenn elektrisch leitfähiges Beschichtungspulver zwischen das Anschlußrohr 56 und den Pulverschlauch 84 gelangt, dann kann es am vorderen Schlauchende 86 zu elektrischen Spannungsüberschlägen aus dem Pulverschlauch 84 und aus dem Anschlußrohr 56 zur Hand einer Bedienungsperson kommen, wenn deren Hand in die Nähe des vorderen Schlauchendes 86 gelangt. Aus diesem Grund ist es vorteilhaft, wenn der kritische Bereich, welcher sich über das äußere Überlappungsende 88 zwischen dem vorderen Schlauchende 86 und dem Anschlußrohr 56 erstreckt, durch einen Abschirmmantel 90 mit radialem Sicherheitsabstand zur Vermeidung von Funkenüberschlägen umgeben ist, welcher aus elektrisch leitendem Material besteht und an seinem vorderen Ende mit der an Erde 50 anschließbaren Buchse 42 elektrisch verbunden ist. Der elektrisch leitende Abschirmmantel 90 ist vorzugsweise axial federelastisch zusammendrückbar, so dass zum Aufstecken des Pulverschlauches 84 auf das Anschlußrohr 56 das hintere Ende 92 des Abschirmmantels 90 mindestens soweit nach vorne in Richtung zur Buchse 42 vorschiebbar ist, wie der Pulverschlauch 84 auf das Anschlußrohr 56 aufgesteckt werden muss.Since the high-voltage electrical charges on the border between the Powder tube 38 and the connecting tube 56 no longer (in contrast to the state of technology) can flow to earth potential 50, the High voltage from the high voltage electrode 32 through the powder path to extend into the powder hose 84 serving for the powder supply, which on the profiled outer circumference 80 of the rear end portion 82 of the Connection tube 56 is attached. The powder hose 84 consists of electrically insulating material. If the powder hose 84 is insufficient the connecting tube 56 is plugged in, or if electrically conductive Coating powder between the connecting pipe 56 and the powder hose 84 arrives, then it can become electrical at the front hose end 86 Flashovers from the powder hose 84 and from the Connection pipe 56 come to the hand of an operator, if their Hand comes near the front hose end 86. For this reason it is advantageous if the critical area, which is beyond the outer Overlap end 88 between the front hose end 86 and the Connection tube 56 extends through a shielding jacket 90 with a radial Safety distance to avoid arcing, which is made of electrically conductive material and on its front End is electrically connected to the socket 42 connectable to earth 50. The electrically conductive shielding jacket 90 is preferably axially resilient compressible, so that to attach the powder hose 84 to the Connection tube 56, the rear end 92 of the shielding jacket 90 at least as far forward in the direction of the socket 42 as the Powder hose 84 must be plugged onto the connecting pipe 56.

    Vorzugsweise ist der vordere Endabschnitt 94 des Abschirmmantels 90 zwischen den Außenumfang des Anschlußrohres 56 und den dieses übergreifenden hinteren Endabschnittes 62 der Buchse 42 eingefügt, vorzugsweise eingespannt. Dabei kann der vordere Endabschnitt 94 des Abschirmmantels 90 in die Gewindegänge der Gewinde 64 und 66 dieser beiden Teile eingreifen. In diesem Bereich können diese Teile auch miteinander verklebt sein. Der vordere Endabschnitt 94 des Abschirmmantels 90 hat einen auf den Außendurchmesser des vorderen Endabschnittes 58 des Anschlußrohres 56 reduzierten Durchmesser, während sein hinterer Endabschnitt 96 mindestens an dem Überlappungsende 88 der Anschlußrohr-Pulverschlauch-Steckverbindung einen größeren Innendurchmesser hat. Der Abschirmmantel 90 ist vorzugsweise eine als Schraubenfeder ausgebildete Druckfeder, wie dies Fig. 1 zeigt.Preferably, the front end portion 94 is the shield shell 90 between the outer circumference of the connecting tube 56 and this overlapping rear end portion 62 of the socket 42 inserted, preferably clamped. The front end portion 94 of the Shielding jacket 90 in the threads of the threads 64 and 66 this engage both parts. In this area, these parts can also be used together be glued. The front end portion 94 of the shield shell 90 has one on the outer diameter of the front end portion 58 of the Connection tube 56 reduced diameter, while its rear End section 96 at least at the overlap end 88 of the connecting pipe powder hose connector has a larger inner diameter. The Shielding jacket 90 is preferably a helical spring Compression spring, as shown in Fig. 1.

    Die in Fig. 1 schematisch dargestellt Hochspannungs-Pulversprühpistole 30 für Beschichtungspulver kann insgesamt eine "Pistolenform" oder eine längliche Form haben, aus deren hinteren Pistoleneingangsseite das Pulverrohr 38 axial herausragt. The high-voltage powder spray gun 30 shown schematically in FIG Coating powder can be either a "gun shape" or an elongated one Have shape, from the rear gun inlet side, the powder tube 38 axially protrudes.

    Gemäß Fig. 2 kann die Hochspannung-Pulversprühpistole 30-2 auch eine "Pistolenform" mit einem Pistolenlauf 100 und mit einem daran nach unten wegragenden Pistolengriff 102 haben, aus dessen unterem Ende, wenn dies die Pistoleneingangsseite 40 ist, der hintere Endabschnitt 60 des Pulverrohres 38 herausragt. Fig. 1 entsprechende Teile sind in Fig. 2 mit den gleichen Bezugszahlen versehen und werden nicht nochmals beschrieben. Zusätzlich zeigt Fig. 2, dass die Hochspannung für die Hochspannungs-Elektrode 32 der Pulversprühpistole 30-2, anstatt von extern zugeführt zu werden, von einem in sie integrierten Hochspannungserzeuger 104 erzeugt werden kann, welchem über ein Kabel 106 eine elektrische Niederspannung zuführbar ist. In dem Kabel 106 kann auch eine elektrische Anschlußleitung enthalten sein zur Erdung der Buchse 42 (in die Pistole einschraubbares Teil aus vorzugsweise Aluminium). Ferner kann ein Druckluftanschluß 108 zur Zufuhr von Druckluft zur Hochspannungs-Elektrode 32 und ein Trigger 110 zum manuellen Einschalten und Ausschalten des Pistolenbetriebes vorgesehen sein.2, the high voltage powder spray gun 30-2 can also "Gun shape" with a gun barrel 100 and with one down protruding pistol grip 102, from its lower end if this is the gun inlet side 40, the rear end portion 60 of the powder tube 38 protrudes. Fig. 1 corresponding parts are in Fig. 2 with the same Provide reference numbers and are not described again. additionally Fig. 2 shows that the high voltage for the high voltage electrode 32 of the Powder spray gun 30-2, instead of being supplied externally, by one in integrated high voltage generator 104 can be generated, which An electrical low voltage can be supplied via a cable 106. By doing Cable 106 may also include an electrical lead Grounding of the socket 42 (preferably a screwable part into the gun) Aluminum). Furthermore, a compressed air connection 108 for supplying compressed air to the high voltage electrode 32 and a trigger 110 for manual Switching on and switching off the gun operation should be provided.

    Claims (13)

    Pulversprühpistole für Beschichtungspulver, enthaltend mindestens eine Hochspannungs-Elektrode (32) zur elektrostatischen Pulveraufladung, ein Pulverrohr (38) aus elektrisch isolierendem Material, welches sich auf einer Pistoleneingangsseite (40) in die Pulversprühpistole erstreckt, ein Anschlußrohr (56) aus elektrisch isolierendem Material, dessen vorderer Endabschnitt benachbart zu dem hinteren Endabschnitt des Pulverrohres (38) angeordnet ist und dessen hinterer Endabschnitt mit einem Pulverschlauch (84) zusammensteckbar ist, eine Buchse (42) aus elektrisch leitendem Material, welche das Pulverrohr (38) dichtend umgibt und an Erdpotential anschließbar ist zum Ableiten von elektrischen Ladungen,
    dadurch gekennzeichnet, dass der vordere Endabschnitt (58) des Anschlußrohres (56) und der hintere Endabschnitt (60) des Pulverrohres (38) einander axial überlappend und luftdicht so weit ineinander gefügt sind, dass sie zwischen sich eine elektrisch isolierende Isolierstrecke (76) zur Vermeidung von elektrischen Strömen von ihrer Innenseite zu ihrer Außenseite bilden, und dass die Buchse (42) sich axial bis an oder über das äußere Überlappungsende (78) der Anschlußrohr-Pulverrohr-Verbindung (56, 38) erstreckt, zur Ableitung von elektrischen Ladungen, falls solche am äußeren Überlappungsende (78) zwischen dem Anschlußrohr (56) und dem Pulverrohr (38) trotz der Isolierstrecke (76) austreten.    Powder spray gun for coating powder, comprising at least one high-voltage electrode (32) for electrostatic powder charging, a powder tube (38) made of electrically insulating material, which extends into the powder spray gun on a gun inlet side (40), a connecting tube (56) made of electrically insulating material, the front end section of which is arranged adjacent to the rear end section of the powder tube (38) and the rear end section of which can be plugged together with a powder hose (84), a bushing (42) made of electrically conductive material, which surrounds the powder tube (38) in a sealing manner and can be connected to earth potential is for discharging electrical charges,
    characterized in that the front end portion (58) of the connecting tube (56) and the rear end portion (60) of the powder tube (38) are axially overlapping and airtight so far into one another that they form an electrically insulating insulating gap (76) between them Avoid electrical currents from the inside to the outside, and that the bushing (42) extends axially to or over the outer overlap end (78) of the connecting pipe-powder pipe connection (56, 38), in order to discharge electrical charges, if such emerge at the outer overlap end (78) between the connecting pipe (56) and the powder pipe (38) despite the insulating section (76).         Pulversprühpistole nach Anspruch 1,
    dadurch gekennzeichnet, dass der hintere Endabschnitt (60) des Pulverrohres (38) in den vorderen Endabschnitt (58) des Anschlußrohres (56) eingesetzt ist.    Powder spray gun according to claim 1,
    characterized in that the rear end portion (60) of the powder tube (38) is inserted into the front end portion (58) of the connection tube (56).         Pulversprühpistole nach Anspruch 2,
    dadurch gekennzeichnet, dass das Anschlußrohr (56) einen vorderen Bohrungsabschnitt (70) hat, dessen Durchmesser größer ist als der sich daran anschließende hintere Bohrungsabschnitt (72), so dass zwischen den beiden Bohrungsabschnitten (70, 72) ein Absatz (68) gebildet ist, und dass der hintere Endabschnitt (60) des Pulverrohres (38) in den vorderen Bohrungsabschnitt des Anschlußrohres (56) eingesetzt ist und auf dessen Absatz (68) sitzt.    Powder spray gun according to claim 2,
    characterized in that the connecting pipe (56) has a front bore section (70), the diameter of which is larger than the adjoining rear bore section (72), so that a shoulder (68) is formed between the two bore sections (70, 72) , and that the rear end portion (60) of the powder tube (38) is inserted into the front bore portion of the connecting tube (56) and sits on the shoulder (68) thereof.         Pulversprühpistole nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass das äußere Überlappungsende (88) der Anschlußrohr-Pulverschlauch-Steckverbindung (56, 84) von einem Abschirmmantel (90) aus elektrisch leitendem Material mit radialem und axialem Luftstreckenabstand umgeben ist, welcher mit der Buchse (42) elektrisch leitend verbunden ist, wobei der Luftstreckenabstand als elektrischer Sicherheitsabstand zur Vermeidung von elektrischen Stromüberschlägen von diesem äußeren Überlappungsende (88) auf den Abschirmmantel (90) ausgebildet ist.    Powder spray gun according to one of the preceding claims,
    characterized in that the outer overlap end (88) of the connecting pipe powder hose plug connection (56, 84) is surrounded by a shielding jacket (90) made of electrically conductive material with radial and axial clearance, which is electrically conductively connected to the socket (42) , wherein the air gap distance is designed as an electrical safety distance to prevent electrical flashovers from this outer overlap end (88) onto the shielding jacket (90).         Pulversprühpistole nach Anspruch 4,
    dadurch gekennzeichnet, dass der Abschirmmantel (90) an der Buchse (42) befestigt ist.    Powder spray gun according to claim 4,
    characterized in that the shielding jacket (90) is attached to the socket (42).         Pulversprühpistole nach Anspruch 5,
    dadurch gekennzeichnet, dass der vordere Endabschnitt des Abschirmmantels (90) in einen Ringraum zwischen der Buchse (42) und das Anschlußrohr (56) eingesetzt ist und darin von diesen beiden Teilen axial und radial gehalten wird.    Powder spray gun according to claim 5,
    characterized in that the front end portion of the shielding jacket (90) is inserted into an annular space between the bushing (42) and the connecting pipe (56) and is held therein axially and radially by these two parts.         Pulversprühpistole nach einem der Ansprüche 4 bis 6,
    dadurch gekennzeichnet, dass der vordere Endabschnitt des Abschirmmantels (90) einen kleineren Durchmesser hat als sein hinterer Endabschnitt, welcher sich mit radialem Abstand über das äußere Überlappungsende (88) erstreckt, welches zwischen dem Anschlußrohr (56) und dem Pulverschlauch (84) gebildet ist.    Powder spray gun according to one of Claims 4 to 6,
    characterized in that the front end portion of the shielding jacket (90) has a smaller diameter than its rear end portion, which extends at a radial distance over the outer overlap end (88) which is formed between the connecting tube (56) and the powder hose (84) ,         Pulversprühpistole nach einem der Ansprüche 4 bis 7,
    dadurch gekennzeichnet, dass der Abschirmmantel (90) eine Schraubenfeder ist, deren Windungen das Anschlußrohr (56) umgeben.     Powder spray gun according to one of claims 4 to 7,
    characterized in that the shielding jacket (90) is a helical spring, the windings of which surround the connecting tube (56).         Pulversprühpistole nach einem der Ansprüche 4 bis 8,
    dadurch gekennzeichnet, dass der Abschirmmantel (90) axial federelastisch komprimierbar ist.    Powder spray gun according to one of claims 4 to 8,
    characterized in that the shielding jacket (90) can be compressed axially resiliently.         Pulversprühpistole nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass mindestens eine der Ineinanderfügungen a) des Pulverrohres (38) mit der Buchse (42) und/oder b) des Pulverrohres (38) mit dem Anschlußrohr (38) und/oder c) der Buchse (42) mit dem Anschlußrohr (56) eine Steckverbindung ist.     Powder spray gun according to one of the preceding claims,
    characterized in that at least one of the interlocking a) the powder tube (38) with the socket (42) and / or b) the powder tube (38) with the connecting tube (38) and / or c) the socket (42) with the connecting tube (56) is a plug connection.     Pulversprühpistole nach Anspruch 10,
    dadurch gekennzeichnet, dass mindestens eine der Steckverbindungen Klebstoff enthält und eine Klebeverbindung ist.    Powder spray gun according to claim 10,
    characterized in that at least one of the plug connections contains adhesive and is an adhesive connection.         Pulversprühpistole nach einem dervorhergehenden Ansprüche 1 bis 9,
    dadurch gekennzeichnet, dass das Anschlußrohr und die Buchse je mit einem Gewinde versehen sind und durch diese Gewinde miteinander verschraubt sind.    Powder spray gun according to one of the preceding claims 1 to 9,
    characterized in that the connecting pipe and the socket are each provided with a thread and are screwed together by this thread.         Pulversprühpistole nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass der hintere Endabschnitt (82) des Anschlußrohres (56) eine profilierte Außenfläche (80) zum Aufstecken des Pulverschlauches (84) hat.    Powder spray gun according to one of the preceding claims,
    characterized in that the rear end section (82) of the connecting pipe (56) has a profiled outer surface (80) for attaching the powder hose (84).
    EP01128493A 2001-03-09 2001-12-07 Powder spray pistol for coating powder Expired - Lifetime EP1238709B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10111697 2001-03-09
    DE10111697A DE10111697A1 (en) 2001-03-09 2001-03-09 Powder spray gun for coating powder

    Publications (3)

    Publication Number Publication Date
    EP1238709A2 true EP1238709A2 (en) 2002-09-11
    EP1238709A3 EP1238709A3 (en) 2003-06-18
    EP1238709B1 EP1238709B1 (en) 2004-10-20

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    Application Number Title Priority Date Filing Date
    EP01128493A Expired - Lifetime EP1238709B1 (en) 2001-03-09 2001-12-07 Powder spray pistol for coating powder

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    US (1) US6758425B2 (en)
    EP (1) EP1238709B1 (en)
    JP (1) JP2002263526A (en)
    AT (1) ATE279989T1 (en)
    CA (1) CA2373865C (en)
    DE (2) DE10111697A1 (en)
    ES (1) ES2231378T3 (en)

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    Also Published As

    Publication number Publication date
    EP1238709B1 (en) 2004-10-20
    EP1238709A3 (en) 2003-06-18
    CA2373865A1 (en) 2002-09-09
    US6758425B2 (en) 2004-07-06
    US20020125349A1 (en) 2002-09-12
    JP2002263526A (en) 2002-09-17
    DE10111697A1 (en) 2002-09-12
    ES2231378T3 (en) 2005-05-16
    ATE279989T1 (en) 2004-11-15
    CA2373865C (en) 2007-01-02
    DE50104199D1 (en) 2004-11-25

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