EP0152375B1 - Spray head for a powder coating apparatus - Google Patents

Spray head for a powder coating apparatus Download PDF

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Publication number
EP0152375B1
EP0152375B1 EP85810036A EP85810036A EP0152375B1 EP 0152375 B1 EP0152375 B1 EP 0152375B1 EP 85810036 A EP85810036 A EP 85810036A EP 85810036 A EP85810036 A EP 85810036A EP 0152375 B1 EP0152375 B1 EP 0152375B1
Authority
EP
European Patent Office
Prior art keywords
powder
spray head
head according
screen
line
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
EP85810036A
Other languages
German (de)
French (fr)
Other versions
EP0152375A3 (en
EP0152375A2 (en
Inventor
Siegfried Frei
Ernst Hohl
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.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT85810036T priority Critical patent/ATE28411T1/en
Publication of EP0152375A2 publication Critical patent/EP0152375A2/en
Publication of EP0152375A3 publication Critical patent/EP0152375A3/en
Application granted granted Critical
Publication of EP0152375B1 publication Critical patent/EP0152375B1/en
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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • B05B1/326—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening the valve being a gate valve, a sliding valve or a cock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/12—Plant for applying liquids or other fluent materials to objects specially adapted for coating the interior of hollow bodies

Definitions

  • the present invention relates to a spray head according to the preamble of claim 1.
  • the coating of the welded longitudinal seams of can bodies with electrostatically charged powder is known and is predominantly used on can bodies in which sensitive filling goods are filled.
  • Polymer resins e.g. Epoxy, polyethylene, etc. are used, which are conveyed to the weld seam in the finest resolution in an air stream and electrostatically charged shortly before hitting the seam.
  • EP-A-0 093 083 which forms the preamble of claim 1
  • a powder / air mixture is expelled directly onto the seam through a line which opens essentially perpendicular to the weld seam.
  • the distribution of the powder which slides along the outer radius of the bend in front of the mouth due to its mass, takes place according to the cross-sectional shape of the pipe in the bend and at the mouth.
  • the transport air leaves the line parallel to the powder and reaches the weld seam on the path given by the position of the line.
  • the objects of the invention are now to give the powder stream a favorable cross-sectional shape and adjustable direction which is adapted to the requirements, and to expel it from the mouth with as little transport air as possible.
  • both the trajectory and the distribution of the powder particles in the trajectory can be influenced according to the requirements of the weld seam to be painted.
  • the powder By expanding the cross-section of the powder line in front of the orifice, the powder can be partially separated from the transport air before it enters the spray chamber.
  • the connection of the cross-sectional expansion to a space in which the pressure is lower than in the cross-sectional expansion enables the discharge of the separated air and an expansion of the powder particles compressed in the powder line.
  • a connection to a suction line enables an almost complete separation of powder and transport air before it exits into the spray room.
  • An essentially cylindrical spray head 1 is attached to the mandrel 2 of a known but not shown machine for producing the weld seam on can bodies 17.
  • a slot-shaped spray chamber 3 with a powder line 4 opening into the bottom thereof, one or more suction lines 5 and a high-voltage electrode 6.
  • a diaphragm 8 with a bore 9 is slidably fitted over the outlet opening 7 of the powder line 4.
  • an eccentric disk 11 is rotatably mounted in the spray head 1, with which the diaphragm 8 can be aligned in a longitudinally displaceable manner via the outlet opening 7 in the spray chamber 3.
  • a cross-sectional widening 12 is provided in the area of approximately 5-10 mm below the screen 8.
  • the cross section of the extension 12 is approximately 1.5 to 3 times, preferably 2 times the cross section of the powder line 4.
  • a connecting channel either leads into the spray chamber 3 or directly into the suction line 5.
  • the connecting channel can be designed as a bore 14 (shown in broken lines) or as a groove 15 on the underside of the panel 8.
  • the cross section of the connecting channel is generally less than 25% of the cross section of the powder line 4.
  • the weld seam 18 of the can body 17 located in the upper apex is located above the spray chamber 3.
  • the bore 9 in the diaphragm 8 can have a circular or a slot-shaped cross section (slot-shaped design not shown).
  • the spray chamber 3 directed upwards in FIGS. 1 and 3 can also be directed downwards if the weld seams on the spray chamber 3 guided can bodies 17 lie below. None changes in the way it works.

Landscapes

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

Abstract

1. Spray head for a powder coating apparatus for applying a strip-like layer of powder to the longitudinal seam of can bodies (17), in which a powder line (4) extends from below into a spray chamber (3), characterised in that a screen (8), which is displaceable above the outlet aperture (7), is attached to the outlet aperture (7) of the powder line (4) leading into the spray chamber (3) for the alignment of the stream of powder, the cross-section of the outlet aperture (7) being adjustable by means of the screen (8).

Description

Die vorliegende Erfindung betrifft einen Sprühkopf gemäss Oberbegriff des Patentanspruches 1.The present invention relates to a spray head according to the preamble of claim 1.

Das Beschichten der geschweissten Längsnähte von Dosenrümpfen mit elektrostatisch aufgeladenem Pulver ist bekannt und findet vorwiegend Verwendung an Dosenrümpfen, in welche empfindliche Füllgüter abgefüllt werden. Als Pulver werden häufig Polymerharze, z.B. Epoxy, Polyethylen, u.a., benutzt, die in feinster Auflösung in einem Luftstrom zur Schweissnaht gefördert und kurz vor dem Auftreffen auf die Naht elektrostatisch aufgeladen werden.The coating of the welded longitudinal seams of can bodies with electrostatically charged powder is known and is predominantly used on can bodies in which sensitive filling goods are filled. Polymer resins, e.g. Epoxy, polyethylene, etc. are used, which are conveyed to the weld seam in the finest resolution in an air stream and electrostatically charged shortly before hitting the seam.

In der den Oberbegriff des Anspruchs 1 bildenden EP-A-0 093 083 wird ein Pulver/Luft-Gemisch direkt durch eine im wesentlichen senkrecht zur Schweissnaht mündende Leitung auf die Naht ausgestossen.In EP-A-0 093 083, which forms the preamble of claim 1, a powder / air mixture is expelled directly onto the seam through a line which opens essentially perpendicular to the weld seam.

Die Verteilung des Pulvers, das infolge seiner Masse am ausseren Radius des Bogens vor der Mündung entlanggleitet, erfolgt entsprechend der Querschnittsform der Leitung im Bogen und an der Mündung. Die Transportluft verlasst die Leitung parallel zum Pulver und gelangt auf der durch die Lage der Leitung gegebenen Bahn zur Schweissnaht.The distribution of the powder, which slides along the outer radius of the bend in front of the mouth due to its mass, takes place according to the cross-sectional shape of the pipe in the bend and at the mouth. The transport air leaves the line parallel to the powder and reaches the weld seam on the path given by the position of the line.

Die Aufgaben der Erfindung bestehen nun darin, dem Pulverstrom eine günstige, den Erfordernissen angepasste Querschnittsform und einstellbare Richtung zu geben und mit möglichst wenig Transportluft aus der Mündung auszustossen.The objects of the invention are now to give the powder stream a favorable cross-sectional shape and adjustable direction which is adapted to the requirements, and to expel it from the mouth with as little transport air as possible.

Nach der Erfindung werden diese Aufgaben gemäss den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Weitere vorteilhafte Ausführungsformen sind in den abhängigen Ansprüchen beschrieben.According to the invention, these objects are achieved according to the characterizing features of claim 1. Further advantageous embodiments are described in the dependent claims.

In überraschender Weise können mit der den Austrittsquerschnitt der Pulverleitung verändernden Blende sowohl die Flugbahn als auch die Verteilung der Pulverpartikel in der Flugbahn den Erfordernissen der zu lackierenden Schweissnaht entsprechend beeinflusst werden. Durch die Querschnittserweiterung der Pulverleitung vor der Blende kann das Pulver teilweise von der Transportluft getrennt werden, bevor dieses in den Sprühraum eintritt. Die Verbindung der Querschnittserweiterung mit einem Raum, in dem ein niedrigerer Druck als in der Querschnittserweiterung herrscht, ermöglicht den Abfluss der ausgeschiedenen Luft und eine Expansion der in der Pulverleitung zusammengedrängten Pulverpartikel. Ein Anschluss an eine Absaugleitung ermöglicht eine nahezu vollständige Trennung von Pulver und Transportluft vor dem Austritt in den Sprühraum.Surprisingly, with the orifice changing the outlet cross section of the powder line, both the trajectory and the distribution of the powder particles in the trajectory can be influenced according to the requirements of the weld seam to be painted. By expanding the cross-section of the powder line in front of the orifice, the powder can be partially separated from the transport air before it enters the spray chamber. The connection of the cross-sectional expansion to a space in which the pressure is lower than in the cross-sectional expansion enables the discharge of the separated air and an expansion of the powder particles compressed in the powder line. A connection to a suction line enables an almost complete separation of powder and transport air before it exits into the spray room.

Anhand eines illustrierten Ausführungsbeispieles wird die Erfindung näher erläutert. Es zeigen:

  • Figur 1 einen Längsschnitt durch einen Sprühkopf,
  • Figur 2 eine Aufsicht auf den Sprühkopf gemäss Figur 1, jedoch ohne Dosenrumpf,
  • Figur 3 einen Querschnitt durch den Sprühkopf längs Linie 111-111 in Figur 2.
The invention is explained in more detail using an illustrated exemplary embodiment. Show it:
  • FIG. 1 shows a longitudinal section through a spray head,
  • FIG. 2 shows a top view of the spray head according to FIG. 1, but without the can body,
  • FIG. 3 shows a cross section through the spray head along line 111-111 in FIG. 2.

Ein im wesentlichen zylinderförmig ausgebildeter Sprühkopf 1 ist am Dorn 2 einer bekannten, jedoch nicht dargestellten Maschine zur Herstellung der Schweissnaht an Dosenrümpfen 17 befestigt.An essentially cylindrical spray head 1 is attached to the mandrel 2 of a known but not shown machine for producing the weld seam on can bodies 17.

Im zentralen, obenliegenden Bereich des Sprühkopfes 1 ist ein schlitzförmiger Sprühraum 3 mit einer an dessen Boden in diesen einmündenden Pulverleitung 4, einer oder mehrerer Absaugleitungen 5 sowie einer Hochspannungselektrode 6 angebracht. Ueber der Austrittsöffnung 7 der Pulverleitung 4 ist eine Blende 8 mit einer Bohrung 9 verschiebbar aufgesetzt. In einer schlitzförmigen Ausnehmung 10 in der Blende 8 ist eine im Sprühkopf 1 drehbar gelagerte Exzenterscheibe 11 eingesetzt, mit der die Blende 8 über der Austrittsöffnung 7 im Sprühraum 3 längsverschiebbar ausgerichtet werden kann.In the central, overhead area of the spray head 1 there is a slot-shaped spray chamber 3 with a powder line 4 opening into the bottom thereof, one or more suction lines 5 and a high-voltage electrode 6. A diaphragm 8 with a bore 9 is slidably fitted over the outlet opening 7 of the powder line 4. In a slot-shaped recess 10 in the diaphragm 8, an eccentric disk 11 is rotatably mounted in the spray head 1, with which the diaphragm 8 can be aligned in a longitudinally displaceable manner via the outlet opening 7 in the spray chamber 3.

Am Ende der Pulverleitung 4 ist im Bereich von ca. 5 - 10 mm unter der Blende 8 eine Querschnittserweiterung 12 angebracht.At the end of the powder line 4, a cross-sectional widening 12 is provided in the area of approximately 5-10 mm below the screen 8.

Der Querschnitt der Erweiterung 12 betragt ca. das 1,5- bis 3-fache, vorzugsweise das 2-fache des Querschnittes der Pulverleitung 4. Vom Ende der Pulverleitung 4 bzw. von der Querschnittserweiterung 12 führt ein Verbindungskanal entweder in den Sprühraum 3 oder direkt in die Absaugleitung 5. Der Verbindungskanal kann als Bohrung 14 (in gebrochenen Linien dargestellt) oder als Nut 15 an der Unterseite der Blende 8 ausgebildet sein. Der Querschnitt des Verbindungskanals beträgt in der Regel weniger als 25 % des Querschnittes der Pulverleitung 4. Die im oberen Scheitel liegende Schweissnaht 18 des Dosenrumpfes 17 befindet sich über dem Sprühraum 3.The cross section of the extension 12 is approximately 1.5 to 3 times, preferably 2 times the cross section of the powder line 4. From the end of the powder line 4 or from the cross section extension 12, a connecting channel either leads into the spray chamber 3 or directly into the suction line 5. The connecting channel can be designed as a bore 14 (shown in broken lines) or as a groove 15 on the underside of the panel 8. The cross section of the connecting channel is generally less than 25% of the cross section of the powder line 4. The weld seam 18 of the can body 17 located in the upper apex is located above the spray chamber 3.

Die Bohrung 9 in der Blende 8 kann einen kreisförmigen oder einen schlitzförmigen Querschnitt aufweisen (schlitzförmige Ausführung nicht dargestellt).The bore 9 in the diaphragm 8 can have a circular or a slot-shaped cross section (slot-shaped design not shown).

Beim Verschieben der Blende 8 aus einer anfänglich konzentrischen Lage zur Austrittsöffnung 7 der Pulverleitung 4 in eine exzentrische wird ein Teil der Austrittsöffnung 7 abgedeckt, wodurch der Pulverstrom 16 eine Ablenkung, in Figur 1 eine Ablenkung nach rechts, erfährt. Ist das Ende der Pulverleitung 4 mit einem Raum verbunden, in dem ein niedriger Druck als in der Pulverleitung 4 herrscht, so kann ein wesentlicher Teil der unter Überdruck stehenden Speise- oder Trägerluft des Pulvers während der Entspannung in der Querschnittserweiterung 12 ausgeschieden werden. ner Pulverstrom 16 tritt dann als fast reiner Festkörperstrom durch die Blende 8 in den Sprühraum 3 aus und bewegt sich auf die Schweissnaht 18 zu.When the diaphragm 8 is moved from an initially concentric position to the outlet opening 7 of the powder line 4 into an eccentric one, part of the outlet opening 7 is covered, as a result of which the powder stream 16 experiences a deflection, in FIG. 1 a deflection to the right. If the end of the powder line 4 is connected to a space in which the pressure is lower than in the powder line 4, a substantial part of the pressurized feed or carrier air of the powder can be eliminated in the cross-sectional widening 12 during expansion. ner powder stream 16 then emerges as an almost pure solid stream through the orifice 8 in the spray chamber 3 and moves toward the weld 18.

Selbstverständlich kann der in den Figuren 1 und 3 nach oben gerichtete Sprühraum 3 auch nach unten gerichtet werden, falls die Schweissnähte der am Sprühraum 3 vorbeigeführten Dosenrümpfe 17 unten liegen. An der Funktionsweise ändert sich dabei nichts.Of course, the spray chamber 3 directed upwards in FIGS. 1 and 3 can also be directed downwards if the weld seams on the spray chamber 3 guided can bodies 17 lie below. Nothing changes in the way it works.

Claims (10)

1. Spray head for a powder coating apparatus for applying a strip-like layer of powder to the longitudinal seam of can bodies (17), in which a powder line (4) extends from below into a spray chamber (3), characterised in that a screen (8), which is displaceable above the outlet aperture (7), is attached to the outlet aperture (7) of the powder line (4) leading into the spray chamber (3) for the alignment of the stream of powder, the cross-section of the outlet aperture (7) being adjustable by means of the screen (8).
2. Spray head according to claim 1, characterised in that the powder line (4) has an enlarged cross-sectional portion (12) in front of the screen (8).
3. Spray head according to claim 2, characterised in that the enlarged cross-sectional portion (12) has a crosssection which is 1.5 to 3 times that of the powder line (4).
4. Spray head according to claim 2, characterised in that the enlarged cross-sectional portion (12) has a crosssection which is twice that of the powder line (4).
5. Spray head according to one of claims 1 to 4, characterised in that the bore (9) in the screen (8) has a circular cross-section.
6. Spray head according to one of claims 1 to 4, characterised in that the bore (9) in the screen (8) has a slot-like cross-section.
7. Spray head according to one of claims 2 to 6, characterised in that the enlarged cross-sectional portion (12) communicates with a chamber in which there exists a pressure which is lower than that in the enlarged cross-sectional portion (12).
8. Spray head according to one of claims 2 to 6, characterised in that the enlarged cross-sectional portion (12) ccmmunicates with a discharge line (5) for the spray chamber (3), or with the spray chamber (3) itself.
9. Spray head according to claim 8, characterised in that the connection means between the enlarged cross-sectional portion (12) and the spray chamber (3) and/or the discharge line (5) is in the form of a groove (15) on the side of the screen (8) facing the outlet aperture (7) or in the form of a bore (14).
10. Spray head according to one of claims 1 to 9, characterised in that the screen (8) is disposed so as to be displaceable above the outlet aperture (7) by means of an eccentric disc (11).
EP85810036A 1984-02-10 1985-02-04 Spray head for a powder coating apparatus Expired EP0152375B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810036T ATE28411T1 (en) 1984-02-10 1985-02-04 SPRAY HEAD OF A POWDER APPLICATION DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH641/84A CH648496A5 (en) 1984-02-10 1984-02-10 SPRAY HEAD OF A POWDER APPLICATION DEVICE.
CH641/84 1984-02-10

Publications (3)

Publication Number Publication Date
EP0152375A2 EP0152375A2 (en) 1985-08-21
EP0152375A3 EP0152375A3 (en) 1986-06-11
EP0152375B1 true EP0152375B1 (en) 1987-07-22

Family

ID=4191745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810036A Expired EP0152375B1 (en) 1984-02-10 1985-02-04 Spray head for a powder coating apparatus

Country Status (4)

Country Link
EP (1) EP0152375B1 (en)
AT (1) ATE28411T1 (en)
CH (1) CH648496A5 (en)
DE (1) DE3560349D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH663910A5 (en) * 1985-02-21 1988-01-29 Praezisions Werkzeuge Ag COATING ARRANGEMENTS AND THEIR USE.
IT206322Z2 (en) * 1985-09-24 1987-08-10 Azzimonti Giovanni Mec Srl AIR DELIVERY ADJUSTMENT DEVICE IN A SPRAY GUN.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH125657A (en) * 1927-03-28 1928-05-01 Badische Maschf Gmbh Compressed air throwing device for concrete, mortar, sand and similar substances.
GB951589A (en) * 1959-12-01 1964-03-04 Pyrene Co Ltd Improvements relating to spraying devices
DE3368210D1 (en) * 1982-04-27 1987-01-22 Siegfried Frei Process for applying powder in strip form and powder application device

Also Published As

Publication number Publication date
EP0152375A3 (en) 1986-06-11
EP0152375A2 (en) 1985-08-21
ATE28411T1 (en) 1987-08-15
CH648496A5 (en) 1985-03-29
DE3560349D1 (en) 1987-08-27

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