EP2253385B1 - Coating device and method for wet varnishing of elongated workpieces - Google Patents

Coating device and method for wet varnishing of elongated workpieces Download PDF

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Publication number
EP2253385B1
EP2253385B1 EP20100162526 EP10162526A EP2253385B1 EP 2253385 B1 EP2253385 B1 EP 2253385B1 EP 20100162526 EP20100162526 EP 20100162526 EP 10162526 A EP10162526 A EP 10162526A EP 2253385 B1 EP2253385 B1 EP 2253385B1
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EP
European Patent Office
Prior art keywords
coating
workpiece
frame
nozzle
coating device
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Not-in-force
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EP20100162526
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German (de)
French (fr)
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EP2253385A1 (en
Inventor
Gerhard Stahl
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Cefla Deutschland GmbH
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Cefla Deutschland GmbH
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Publication of EP2253385A1 publication Critical patent/EP2253385A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0241—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to elongated work, e.g. wires, cables, tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0405—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads
    • B05B13/041—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads with spray heads reciprocating along a straight line

Definitions

  • the invention relates to a coating device for wet painting for elongated workpieces and a method for coating by wet painting elongated workpieces according to the features mentioned in the preamble of claims 1 and 12 respectively. These features are out DE 93 16 759 U known.
  • Elongated workpieces such as beams or boards, which may consist of different materials, in particular wood, are coated in industrial processes.
  • the coating is done, for example, with paint.
  • This is a paint diluted with water, solvent or the like, which is applied in particular to the elongated workpiece via spray nozzles. After application, the paint dries out due to evaporation.
  • the elongated workpiece is in particular beams or boards made of wood or plastic, heating of the workpieces is possible only within narrow limits. In such workpieces is thus a conventional powder coating, in which a strong heating of the workpieces for melting the powder material is required, not possible.
  • coating devices For industrial coating of elongated workpieces coating devices are known in which the to be coated Workpiece is moved by means of a conveyor in the longitudinal direction of the workpiece.
  • the conveyor has, for example driven rollers, belts or the like, so that a movement of the workpieces in the longitudinal direction at high speed is possible. Due to the very high speeds, an economical coating of the elongated workpieces by wet painting is possible. In this case, transport speeds of the elongated workpieces of over 3 m / min, in particular over 15 m / min and sometimes even over 30 m / min realized.
  • the workpiece is passed through a coating frame.
  • the coating frame has a cross section which is slightly larger than the cross section of the workpiece to be coated.
  • the coating frame completely surrounds the workpiece.
  • at least one coating nozzle is arranged in the coating frame.
  • the coating die is typically a slot die which extends in the coating frame over the side of the workpiece to be coated.
  • the coating nozzle completely surrounds the workpiece.
  • a suction chamber is provided to which in particular negative pressure is applied.
  • the suction chamber which may preferably also be frame-shaped, also completely surrounds the workpiece. Excess coating medium, such as excess coating lacquer, is suctioned off via the suction chamber.
  • a discontinuous transport of the workpieces takes place.
  • a discontinuous promotion of the elongated workpiece is an uneven coating. If, for example, the workpiece is stopped for a short time or moved more slowly, a light streak can be produced on the upper sides of the workpiece to be coated, since too much coating medium is sucked out through the suction chamber becomes. It is also possible that an overcoating occurs in this case, since further coating medium is supplied through the coating nozzle and this is not completely dissipated.
  • the object of the invention is to provide a coating apparatus for elongate workpieces, as well as a method for coating elongate workpieces, is realized by or through which a uniform coating of the elongated workpiece.
  • the object is achieved by a coating device according to claim 1 or by a coating method according to claim 12.
  • the coating device for applying coating medium which is a wet paint, ie, a water-soluble or solvent-provided paint
  • an application device which is connected to a movement device.
  • the application device has a coating frame which surrounds the workpiece at least partially, in particular completely, wherein the coating frame has at least one preferably a plurality of nozzles which are directed in the direction of the workpiece.
  • the elongate workpieces which are in particular wooden boards or beams, are moved via a conveyor in the workpiece longitudinal direction at high speed.
  • the application device is moved.
  • the application device which in particular also moves in the longitudinal direction of the workpiece, preferably performs a reciprocating motion is thus on the one hand in the same direction as the workpiece, but at a lower speed, on the other hand moves in the opposite direction.
  • the workpiece is moved by the conveyor at a speed of preferably more than 3 m / min, in particular more than 15 m / min and more preferably more than 30 m / min.
  • the movement of the application device is significantly slower in this case, in particular, the maximum speed of the application device is less than 5%, in particular less than 2% of the movement speed of the workpiece.
  • the coating frame of the coating device for elongate tools is connected to a movement device.
  • This makes it possible to move the coating frame and thus the at least one arranged within the coating frame coating nozzle in the longitudinal direction. It is thus possible to move the coating frame in the longitudinal direction in addition to moving the workpiece in its longitudinal direction.
  • a movement of the coating frame in the conveying direction or against the conveying direction of the workpiece can take place.
  • a reciprocating motion or a pendulum movement of the coating frame can take place.
  • the coating device according to the invention Even with a continuous delivery of the workpiece, it is advantageous to use the coating device according to the invention with a displaceable coating frame, since, for example, a pendulum movement of the coating frame can result in a multi-layer application.
  • the moving means is connected to a control means for reciprocating the moving frame.
  • a control means for reciprocating the moving frame This may be a purely mechanical control device. However, it may also in addition or instead of the mechanical control device a be provided electronic control device.
  • the control device comprises a pneumatic or hydraulic cylinder which is connected to the coating frame.
  • a pneumatic and / or hydraulic cylinder By a corresponding control of the cylinder, for example, a regular pendulum movement of the coating frame but also a short-term moving of the coating frame in a discontinuous conveying of the workpiece is possible.
  • the control device may for example also have a toothed rack which is fixedly connected to the movement frame, wherein then engages a driven by an electric motor gear in the rack for moving the coating frame.
  • the coating frame preferably has a slide guide. This ensures that the coating frame is not tilted or twisted when moving. This is necessary to ensure that the gap between the coating frame and workpiece remains as constant as possible and in particular a touching of the workpiece when moving the coating frame is avoided.
  • the coating frame not only has a coating nozzle designed as a slot nozzle, which preferably completely surrounds the workpiece, but it is additionally provided a suction chamber.
  • the suction chamber which is preferably connected to a vacuum pump, serves to suck off excess coating material and is preferably arranged immediately adjacent to the coating nozzle.
  • the inventive method for coating elongated workpieces by wet painting which is stirred in a preferred embodiment by means of the coating device described above, moving the workpiece takes place in the longitudinal direction.
  • the workpiece is coated by means of a coating frame which at least partially surrounds the workpiece and which has a coating nozzle or another application coating.
  • the coating frame is moved in the longitudinal direction of the workpiece during coating.
  • the coating frame can be moved in or against the conveying direction of the workpiece.
  • the coating frame is thus moved relative to the workpiece. It is possible, for example, to control the movement of the movement frame during a discontinuous movement of the workpiece in such a way that the relative speed between the workpiece and the coating frame remains constant, in particular over the entire coating process.
  • the coating frame is moved discontinuously.
  • the motion frame performs a reciprocating motion or a pendulum motion.
  • the application device is moved, in particular likewise in the longitudinal direction of the workpiece.
  • the method according to the invention is preferably further developed as described above with reference to the device according to the invention.
  • the coating apparatus according to the invention and the method according to the invention also have the advantage that less waste is produced in the event of a plant stop. This is due to the movement of the applicator, since in an at least a short stop of the plant no too thick layer application takes place and also a growth of the applicator, in particular the nozzle over a longer period can be avoided.
  • the elongate workpiece 10 is conveyed at high speed during the entire coating process.
  • a coating frame 16 For coating the outer sides of the workpiece, a coating frame 16 is provided, wherein in the illustrated embodiment, the coating frame 16 completely surrounds the workpiece and has an opening which has the same outer contour as the workpiece 10.
  • the opening is slightly larger than the cross section of the workpiece 10, so that a small gap 18 is formed on all sides of the workpiece between this and the coating frame. For coating the workpiece 10 by wet painting, this passes through the coating frame 16 in the direction of the arrow 12.
  • the coating frame 16 has in the illustrated embodiment, a circumferential slot 20. This is connected to a plurality of supply lines 22 for supplying the coating medium such as paint.
  • the supply lines 22 are connected to a reservoir 24, wherein the supply of the coating medium by means of a pump 26 takes place.
  • a circumferential suction chamber 28 is provided within the coating frame 16.
  • a negative pressure is generated by a pump 30.
  • the pump 30 is connected via a hose 30 to the suction chamber 28.
  • the extracted via the suction chamber 28 excess coating medium is conveyed by the pump 30 back into the reservoir 24. Possibly.
  • a corresponding separator interposed.
  • the coating frame 16 is connected to a movement device 34 so that the coating frame 16 can be moved back and forth in the direction of an arrow 36.
  • the movement of the coating frame 16 takes place here in the longitudinal direction of the workpiece 10, that is to say in the conveying direction 12 of the workpiece 10 or counter to the conveying direction.
  • the movement device in the illustrated embodiment, a hydraulic and / or pneumatic cylinder 38.
  • the piston of the cylinder 38 is directly connected to the coating frame 16.
  • the hydraulic or pneumatic medium is supplied and removed to the chamber of the cylinder 38.
  • the control device 40 can in particular also have electronic components that are possibly connected to sensors which, for example, measure the movement speed of the workpiece 10 and / or. or measure the amount of coating medium pumped and / or the amount of coating medium recycled.
  • the slide guide 42 has in particular two mutually parallel tubular guide elements 44, against which two, a concave surface having rollers 46.
  • the two pairs of rollers 46, each cooperating with a cylindrical guide element 44, are arranged in a holding element 48 connected to the frame 16.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft eine Beschichtungsvorrichtung zur Naßlackierung für langgestreckte Werkstücke sowie ein Verfahren zum Beschichten durch Naßlackierung langgestreckter Werkstücke gemäß den im Oberbegriff der Ansprüche 1 bzw. 12 genannten Merkmalen. Diese Merkmale sind aus DE 93 16 759 U bekannt.The invention relates to a coating device for wet painting for elongated workpieces and a method for coating by wet painting elongated workpieces according to the features mentioned in the preamble of claims 1 and 12 respectively. These features are out DE 93 16 759 U known.

Langgestreckte Werkstücke wie Balken oder Bretter, die aus unterschiedlichem Material, insbesondere Holz bestehen können, werden in industriellen Verfahren beschichtet. Die Beschichtung erfolgt beispielsweise mit Lack. Es handelt sich hierbei um einen mit Wasser, Lösungsmittel oder dergleichen verdünnten Lack, der insbesondere über Sprühdüsen auf das langgestreckte Werkstück aufgetragen wird. Nach dem Auftragen erfolgt aufgrund der Verdunstung ein Austrocknen des Lacks. Da es sich bei dem langgestreckten Werkstück insbesondere um Balken oder Bretter aus Holz oder Kunststoff handelt, ist eine Erwärmung der Werkstücke nur in geringen Grenzen möglich. Bei derartigen Werkstücken ist somit eine herkömmliche Pulverbeschichtung, bei der ein starkes Erwärmen der Werkstücke zum Aufschmelzen des Pulvermaterials erforderlich ist, nicht möglich.Elongated workpieces such as beams or boards, which may consist of different materials, in particular wood, are coated in industrial processes. The coating is done, for example, with paint. This is a paint diluted with water, solvent or the like, which is applied in particular to the elongated workpiece via spray nozzles. After application, the paint dries out due to evaporation. Since the elongated workpiece is in particular beams or boards made of wood or plastic, heating of the workpieces is possible only within narrow limits. In such workpieces is thus a conventional powder coating, in which a strong heating of the workpieces for melting the powder material is required, not possible.

Zur industriellen Beschichtung von langgestreckten Werkstücken sind Beschichtungsvorrichtungen bekannt, bei denen das zu beschichtende Werkstück mittels einer Fördereinrichtung in Längsrichtung des Werkstücks bewegt wird. Die Fördereinrichtung weist beispielsweise angetriebene Rollen, Bänder oder dergleichen auf, so dass ein Bewegen der Werkstücke in Längsrichtung mit hoher Geschwindigkeit möglich ist. Aufgrund der sehr hohen Geschwindigkeiten ist eine wirtschaftliche Beschichtung der langgestreckten Werkstücke durch Naßlackierung möglich. Hierbei werden Transportgeschwindigkeiten der langgestreckten Werkstücke von über 3 m/min insbesondere über 15 m/min und bisweilen sogar über 30 m/min realisiert.For industrial coating of elongated workpieces coating devices are known in which the to be coated Workpiece is moved by means of a conveyor in the longitudinal direction of the workpiece. The conveyor has, for example driven rollers, belts or the like, so that a movement of the workpieces in the longitudinal direction at high speed is possible. Due to the very high speeds, an economical coating of the elongated workpieces by wet painting is possible. In this case, transport speeds of the elongated workpieces of over 3 m / min, in particular over 15 m / min and sometimes even over 30 m / min realized.

Zum Beschichten einzelner oder aller Oberseiten des Werkstücks, wird das Werkstück durch einen Beschichtungsrahmen geführt. Der Beschichtungsrahmen weist einen Querschnitt auf, der geringfügig größer als der Querschnitt des zu beschichtenden Werkstücks ist. Üblicherweise umgibt der Beschichtungsrahmen das Werkstück vollständig. Zur Beschichtung ist in dem Beschichtungsrahmen mindestens eine Beschichtungsdüse angeordnet. Bei der Beschichtungsdüse handelt es sich üblicherweise um eine Schlitzdüse, die sich in dem Beschichtungsrahmen über die zu beschichtende Seite des Werkstücks erstreckt. Bei einer allseitigen Beschichtung des Werkstücks umgibt die Beschichtungsdüse das Werkstück vollständig. Ggf. ist zusätzlich eine Absaugkammer vorgesehen, an der insbesondere Unterdruck anliegt. Die Absaugkammer, die vorzugsweise ebenfalls rahmenförmig ausgebildet sein kann, umgibt das Werkstück ebenfalls vollständig. Über die Absaugkammer wird überschüssiges Beschichtungsmedium, wie überschüssiger Beschichtungslack abgesaugt.For coating individual or all upper sides of the workpiece, the workpiece is passed through a coating frame. The coating frame has a cross section which is slightly larger than the cross section of the workpiece to be coated. Usually, the coating frame completely surrounds the workpiece. For coating, at least one coating nozzle is arranged in the coating frame. The coating die is typically a slot die which extends in the coating frame over the side of the workpiece to be coated. In the case of an all-round coating of the workpiece, the coating nozzle completely surrounds the workpiece. Possibly. In addition, a suction chamber is provided to which in particular negative pressure is applied. The suction chamber, which may preferably also be frame-shaped, also completely surrounds the workpiece. Excess coating medium, such as excess coating lacquer, is suctioned off via the suction chamber.

In besonderen Anwendungsfällen erfolgt eine diskontinuierlicher Transport der Werkstücke. Bei einer diskontinuierlichen Förderung des langgestreckten Werkstücks erfolgt eine ungleichmäßige Beschichtung. Wird das Werkstück beispielsweise kurzzeitig angehalten oder langsamer bewegt, kann eine heller Streifen an den zu beschichtenden Oberseiten des Werkstücks hervorgerufen werden, da durch die Absaugkammer zuviel Beschichtungsmedium abgesaugt wird. Ebenso ist es möglich, dass in diesem Fall eine Überbeschichtung auftritt, da weiterhin Beschichtungsmedium durch die Beschichtungsdüse zugeführt wird und dies nicht vollständig abgeführt wird. Auch ist es nicht möglich, im Moment des Stillstandes oder des langsameren Bewegen des Werkstücks die das Beschichtungsmedium der Beschichtungsdüse zuführende Pumpe abzuschalten, da sich innerhalb des Beschichtungsrahmens noch Beschichtungsmedium befindet, dass sich sodann auf das Werkstück niederschlägt, so dass auch in diesem Fall eine Überbeschichtung erfolgen kann. Um die Gefahr des Entstehens heller Streifen oder Überbeschichtungen zu verringern, wäre es erforderlich, über eine hochsensible Steuerung die Menge des zugeführten Mediums sowie die Menge des abgesaugten Mediums zu bestimmen und zu regeln. Eine derartige Regelung wäre äußerst aufwendig.In special cases, a discontinuous transport of the workpieces takes place. In a discontinuous promotion of the elongated workpiece is an uneven coating. If, for example, the workpiece is stopped for a short time or moved more slowly, a light streak can be produced on the upper sides of the workpiece to be coated, since too much coating medium is sucked out through the suction chamber becomes. It is also possible that an overcoating occurs in this case, since further coating medium is supplied through the coating nozzle and this is not completely dissipated. It is also not possible, at the moment of stoppage or slower movement of the workpiece, to switch off the pump supplying the coating medium to the coating nozzle, since there is still coating medium within the coating frame, which then deposits on the workpiece, so that in this case too an overcoating occurs can be done. In order to reduce the risk of the formation of light streaks or overcoats, it would be necessary to determine and regulate the amount of medium supplied and the amount of extracted medium by means of highly sensitive control. Such a scheme would be extremely expensive.

Aufgabe der Erfindung ist es, eine Beschichtungsvorrichtung für langgestreckte Werkstücke, sowie ein Verfahren zum Beschichten langgestreckter Werkstücke zu schaffen, durch die bzw. durch das ein gleichmäßiges Beschichten des langgestreckten Werkstücks realisiert ist.The object of the invention is to provide a coating apparatus for elongate workpieces, as well as a method for coating elongate workpieces, is realized by or through which a uniform coating of the elongated workpiece.

Die Lösung der Aufgabe erfolgt erfindungsgemäß durch eine Beschichtungsvorrichtung gemäß Anspruch 1 bzw. durch ein Beschichtungsverfahren gemäß Anspruch 12.The object is achieved by a coating device according to claim 1 or by a coating method according to claim 12.

Erfindungsgemäß weist die Beschichtungsvorrichtung zum Auftragen von Beschichtungsmedium, bei dem es sich um einen Naßlack handelt, d.h. um einen wasserlöslichen oder mit einem Lösungsmittel versehenen Lack, eine Auftragseinrichtung auf, die mit einer Bewegungseinrichtung verbunden ist. Hierdurch ist ein Bewegen der Auftragseinrichtung in Längsrichtung des Werkstücks möglich, um ein Vergleichmäßigen der Beschichtung zu realisieren. Die Auftragseinrichtung weist einen Beschichtungsrahmen auf, der das Werkstück zumindest teilweise, insbesondere vollständig umgibt, wobei der Beschichtungsrahmen mindestens eine vorzugsweise mehrere Düsen aufweist, die in Richtung des Werkstücks gerichtet sind. Um wirtschaftlich hohe Mengen an langgestreckten Werkstücken durch Naßlackierung zu Beschichten, werden die langgestreckten Werkstücke, bei denen es sich insbesondere um Holzbretter oder Balken handelt, über eine Fördereinrichtung in Werkstück-Längsrichtung mit hoher Geschwindigkeit bewegt. Zusätzlich erfolgt erfindungsgemäß ein Bewegen der Auftragseinrichtung. Die Auftragseinrichtung, die sich insbesondere ebenfalls in Längsrichtung des Werkstücks bewegt, vorzugsweise eine Hin- und Herbewegung ausführt, wird somit einerseits in dieselbe Richtung wie das Werkstück, jedoch mit geringerer Geschwindigkeit, andererseits in entgegengesetzter Richtung bewegt. Hierbei erfolgt ein Bewegen des Werkstücks durch die Fördereinrichtung mit einer Geschwindigkeit von vorzugsweise mehr als 3 m/min, insbesondere mehr als 15 m/min und besonders bevorzugt mehr als 30 m/min. Die Bewegung der Auftragsvorrichtung ist hierbei deutlich langsamer, insbesondere beträgt die maximale Geschwindigkeit der Auftragseinrichtung weniger als 5%, insbesondere weniger als 2% der Bewegungsgeschwindigkeit des Werkstücks. Durch die Kombination der Bewegung des Werkstücks in Längsrichtung mit hoher Geschwindigkeit und der Bewegung der Auftragseinrichtung, kann eine äußerst gleichmäßige Beschichtung mit Naßlack und somit ein hoher optischer Anspruch erzielt werden. Gleichzeitig ist ein äußerst wirtschaftliches Produzieren großer Mengen an langgestreckten Werkstücken möglich. Insbesondere können derart hohe optische Ansprüche auch bei einer, beispielsweise durch kurzfristige Störungen auftretenden, diskontinuierlichen Förderung des langgestreckten Werkstücks gewährleistet werden.According to the invention, the coating device for applying coating medium, which is a wet paint, ie, a water-soluble or solvent-provided paint, an application device, which is connected to a movement device. This makes it possible to move the application device in the longitudinal direction of the workpiece in order to ensure that the coating is uniform realize. The application device has a coating frame which surrounds the workpiece at least partially, in particular completely, wherein the coating frame has at least one preferably a plurality of nozzles which are directed in the direction of the workpiece. In order to coat economically large quantities of elongate workpieces by wet painting, the elongate workpieces, which are in particular wooden boards or beams, are moved via a conveyor in the workpiece longitudinal direction at high speed. In addition, according to the invention, the application device is moved. The application device, which in particular also moves in the longitudinal direction of the workpiece, preferably performs a reciprocating motion is thus on the one hand in the same direction as the workpiece, but at a lower speed, on the other hand moves in the opposite direction. In this case, the workpiece is moved by the conveyor at a speed of preferably more than 3 m / min, in particular more than 15 m / min and more preferably more than 30 m / min. The movement of the application device is significantly slower in this case, in particular, the maximum speed of the application device is less than 5%, in particular less than 2% of the movement speed of the workpiece. By combining the movement of the workpiece in the longitudinal direction at high speed and the movement of the applicator, an extremely uniform coating with wet paint and thus a high optical demand can be achieved. At the same time, extremely economical production of large quantities of elongate workpieces is possible. In particular, such high optical demands can be ensured even in the case of a discontinuous delivery of the elongated workpiece, for example due to short-term disturbances.

Im Nachfolgenden wird die Erfindung anhand einer bevorzugten Ausführungsform der Erfindung beschrieben, in der die Auftragseinrichtung einen erfindungsgemäßen Beschichtungsrahmen aufweist.In the following, the invention will be described with reference to a preferred embodiment of the invention, in which the applicator has a coating frame according to the invention.

Erfindungsgemäß ist der Beschichtungsrahmen der Beschichtungsvorrichtung für langgestreckte Werkzeuge mit einer Bewegungseinrichtung verbunden. Hierdurch ist es möglich, den Beschichtungsrahmen und somit die mindestens eine innerhalb des Beschichtungsrahmens angeordnete Beschichtungsdüse in Längsrichtung zu bewegen. Es ist somit möglich, zusätzlich zu dem Bewegen des Werkstücks in dessen Längsrichtung, den Beschichtungsrahmen in Längsrichtung zu bewegen. Hierbei kann ein Bewegen des Beschichtungsrahmens in Förderrichtung oder entgegen der Förderrichtung des Werkstücks erfolgen. Insbesondere kann eine Hin- und Herbewegung bzw. eine Pendelbewegung des Beschichtungsrahmens erfolgen. Dies hat bei einer diskontinuierlichen Förderung von Werkstückträgern den Vorteil, dass durch entsprechendes Bewegen des Beschichtungsrahmens ein zu starker Auftrag von Beschichtungsmedium oder auch ein zu starkes Absaugen des Beschichtungsmediums und die hierdurch hervorgerufenen hellen Streifen vermieden werden können. Selbst wenn aufgrund der diskontinuierlichen Förderung des Werkstückes dieses in einzelnen Bereichen stärker beschichtet wird, hat das Bewegen des Beschichtungsrahmens den Vorteil, dass die etwas dickerer Beschichtung über einen größeren Bereich erfolgt und somit das überschüssige Beschichtungsmaterial besser verteilt ist. Die Beschichtungsdicke nimmt somit nur geringfügig zu und ist für das Auge nicht sichtbar.According to the invention, the coating frame of the coating device for elongate tools is connected to a movement device. This makes it possible to move the coating frame and thus the at least one arranged within the coating frame coating nozzle in the longitudinal direction. It is thus possible to move the coating frame in the longitudinal direction in addition to moving the workpiece in its longitudinal direction. In this case, a movement of the coating frame in the conveying direction or against the conveying direction of the workpiece can take place. In particular, a reciprocating motion or a pendulum movement of the coating frame can take place. This has the advantage in the case of a discontinuous conveying of workpiece carriers that, by appropriately moving the coating frame, excessive application of coating medium or else excessive suction of the coating medium and the light stripes caused thereby can be avoided. Even if, due to the discontinuous conveyance of the workpiece, it is more strongly coated in individual areas, moving the coating frame has the advantage that the somewhat thicker coating takes place over a larger area and thus the excess coating material is better distributed. The coating thickness thus increases only slightly and is not visible to the eye.

Auch bei einer kontinuierlichen Förderung des Werkstücks ist das Verwenden der erfindungsgemäßen Beschichtungsvorrichtung mit verschiebbarem Beschichtungsrahmen vorteilhaft, da beispielsweise durch eine Pendelbewegung des Beschichtungsrahmens ein mehrschichtiger Auftrag erfolgen kann.Even with a continuous delivery of the workpiece, it is advantageous to use the coating device according to the invention with a displaceable coating frame, since, for example, a pendulum movement of the coating frame can result in a multi-layer application.

Vorzugsweise ist die Bewegungseinrichtung mit einer Steuereinrichtung zum Hin- und Herbewegen des Bewegungsrahmens verbunden. Hierbei kann es sich um eine rein mechanische Steuereinrichtung handeln. Es kann jedoch auch ggf. zusätzlich oder anstelle der mechanischen Steuereinrichtung eine elektronische Steuereinrichtung vorgesehen sein. Insbesondere umfasst die Steuereinrichtung einen Pneumatik- oder Hydraulikzylinder der mit dem Beschichtungsrahmen verbunden ist. Durch eine entsprechende Ansteuerung des Zylinders ist beispielsweise eine regelmäßig Pendelbewegung des Beschichtungsrahmens aber auch ein kurzfristiges Bewegen des Beschichtungsrahmens bei einer diskontinuierlichen Fördern des Werkstücks möglich. Anstelle oder zusätzlich zu einem Pneumatik- und/oder Hydraulikzylinder kann die Steuereinrichtung beispielsweise auch eine Zahnstange aufweisen, die fest mit dem Bewegungsrahmen verbunden ist, wobei sodann ein von einem Elektromotor angetriebenes Zahnrad in die Zahnstange zum Bewegen des Beschichtungsrahmens eingreift.Preferably, the moving means is connected to a control means for reciprocating the moving frame. This may be a purely mechanical control device. However, it may also in addition or instead of the mechanical control device a be provided electronic control device. In particular, the control device comprises a pneumatic or hydraulic cylinder which is connected to the coating frame. By a corresponding control of the cylinder, for example, a regular pendulum movement of the coating frame but also a short-term moving of the coating frame in a discontinuous conveying of the workpiece is possible. Instead of or in addition to a pneumatic and / or hydraulic cylinder, the control device may for example also have a toothed rack which is fixedly connected to the movement frame, wherein then engages a driven by an electric motor gear in the rack for moving the coating frame.

Der Beschichtungsrahmen weist vorzugsweise eine Schlittenführung auf. Hierdurch ist gewährleistet, dass der Beschichtungsrahmen beim Bewegen nicht verkippt oder verdreht wird. Dies ist erforderlich um sicherzustellen, dass der Spalt zwischen Beschichtungsrahmen und Werkstück möglichst konstant bleibt und insbesondere ein Berühren des Werkstücks beim Bewegen des Beschichtungsrahmens vermieden ist.The coating frame preferably has a slide guide. This ensures that the coating frame is not tilted or twisted when moving. This is necessary to ensure that the gap between the coating frame and workpiece remains as constant as possible and in particular a touching of the workpiece when moving the coating frame is avoided.

Vorzugsweise weist der Beschichtungsrahmen nicht nur eine als Schlitzdüse ausgebildete Beschichtungsdüse auf, die das Werkstück vorzugsweise vollständig umgibt, sondern es ist zusätzlich eine Absaugkammer vorgesehen. Die Absaugkammer, die vorzugsweise mit einer Unterdruckpumpe verbunden ist, dient zum Absaugen überschüssigen Beschichtungsmaterials und ist vorzugsweise unmittelbar benachbart zu der Beschichtungsdüse angeordnet. Bei einer umlaufenden, in sich geschlossenen Beschichtungsdüse ist es bevorzugt auch die Absaugkammer entsprechend umlaufend auszubilden.Preferably, the coating frame not only has a coating nozzle designed as a slot nozzle, which preferably completely surrounds the workpiece, but it is additionally provided a suction chamber. The suction chamber, which is preferably connected to a vacuum pump, serves to suck off excess coating material and is preferably arranged immediately adjacent to the coating nozzle. In the case of a circulating, self-contained coating nozzle, it is also preferable to design the suction chamber in a correspondingly circumferential manner.

Durch das erfindungsgemäße Verfahren zum Beschichten langgestreckter Werkstücke durch Naßlackierung, das in bevorzugter Ausführungsform mit Hilfe der vorstehend beschriebenen Beschichtungsvorrichtung durchgerührt wird, erfolgt ein Bewegen des Werkstücks in Längsrichtung. Das Werkstück wird mittels eines das Werkstück zumindest teilweise umgebenden Beschichtungsrahmens der eine Beschichtungsdüse aufweist oder einer anderen Auftragsbeschichtung, beschichtet. Erfindungsgemäß erfolgt während des Beschichtens ein Bewegen des Beschichtungsrahmens in Längsrichtung des Werkstücks. Hierbei kann der Beschichtungsrahmen in oder entgegen der Förderrichtung des Werkstücks bewegt werden. Vorzugsweise erfolgt somit ein Bewegen des Beschichtungsrahmens relativ zum Werkstück. Es ist beispielsweise möglich, bei einem diskontinuierlichen Bewegen des Werkstücks das Bewegen des Bewegungsrahmens derart zu steuern, dass die Relativgeschwindigkeit zwischen Werkstück und Beschichtungsrahmen insbesondere über den gesamten Beschichtungsprozess konstant bleibt. Vorzugsweise wird der Beschichtungsrahmen diskontinuierlich bewegt. Insbesondere führt der Bewegungsrahmen eine Hin- und Herbewegung bzw. eine Pendelbewegung aus. Durch das erfindungsgemäße Verfahren erfolgt somit zusätzlich zu dem Bewegen des langgestreckten Werkstücks mit hoher Geschwindigkeit ein Bewegen der Auftragseinrichtung, insbesondere ebenfalls in Längsrichtung des Werkstücks. Hierdurch können, wie vorstehend anhand der Vorrichtung beschrieben, durch Naßlackierung insbesondere von Holzbrettern und dergleichen optisch hochwertige Oberflächen realisiert werden.The inventive method for coating elongated workpieces by wet painting, which is stirred in a preferred embodiment by means of the coating device described above, moving the workpiece takes place in the longitudinal direction. The workpiece is coated by means of a coating frame which at least partially surrounds the workpiece and which has a coating nozzle or another application coating. According to the invention, the coating frame is moved in the longitudinal direction of the workpiece during coating. In this case, the coating frame can be moved in or against the conveying direction of the workpiece. Preferably, the coating frame is thus moved relative to the workpiece. It is possible, for example, to control the movement of the movement frame during a discontinuous movement of the workpiece in such a way that the relative speed between the workpiece and the coating frame remains constant, in particular over the entire coating process. Preferably, the coating frame is moved discontinuously. In particular, the motion frame performs a reciprocating motion or a pendulum motion. As a result of the method according to the invention, in addition to the movement of the elongate workpiece at high speed, the application device is moved, in particular likewise in the longitudinal direction of the workpiece. As a result, as described above with reference to the device, by wet painting in particular of wooden boards and the like optically high-quality surfaces can be realized.

Das erfindungsgemäße Verfahren ist vorzugsweise wie vorstehend anhand der erfindungsgemäßen Vorrichtung beschrieben, weiter gebildet.The method according to the invention is preferably further developed as described above with reference to the device according to the invention.

Die erfindungsgemäße Beschichtungsvorrichtung sowie das erfindungsgemäße Verfahren weisen insbesondere auch den Vorteil auf, dass bei einem Anlagenstop weniger Ausschuss produziert wird. Dies liegt in der Bewegung der Auftragseinrichtung begründet, da bei einem zumindest kurzem Anlagenstop kein zu dicker Schichtauftrag erfolgt und ferner ein Zuwachsen der Auftragseinrichtung, insbesondere der Düsen über einen längeren Zeitraum vermieden werden kann.In particular, the coating apparatus according to the invention and the method according to the invention also have the advantage that less waste is produced in the event of a plant stop. This is due to the movement of the applicator, since in an at least a short stop of the plant no too thick layer application takes place and also a growth of the applicator, in particular the nozzle over a longer period can be avoided.

Nachfolgend wird die Erfindung anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die anliegenden Zeichnungen näher erläutert.The invention will be explained in more detail with reference to a preferred embodiment with reference to the accompanying drawings.

Es zeigen:

Fig. 1
eine schematische Seitenansicht einer erfindungsgemäßen Beschichtungsvorrichtung und
Fig. 2
eine schematische Schnittansicht entlang der Linie II-II in Fig. 1.
Show it:
Fig. 1
a schematic side view of a coating apparatus according to the invention and
Fig. 2
a schematic sectional view taken along the line II-II in Fig. 1 ,

Ein langgestrecktes Werkstück 10 bei dem es sich im dargestellten Ausführungsbeispiel um einen Balken handelt, wird in dessen Längsrichtung in Richtung eines Pfeils 12 bewegt. Die Bewegung erfolgt durch eine Fördereinrichtung 14, die im dargestellten Ausführungsbeispiel mehrere zumindest teilweise angetriebene Rollen aufweist. Hierbei erfolgt ein Fördern des langgestreckten Werkstücks 10 mit hoher Geschwindigkeit während des gesamten Beschichtungsprozesses.An elongated workpiece 10, which in the illustrated embodiment is a bar, is moved in the longitudinal direction in the direction of an arrow 12. The movement takes place by means of a conveying device 14, which has a plurality of at least partially driven rollers in the illustrated embodiment. Here, the elongate workpiece 10 is conveyed at high speed during the entire coating process.

Zum Beschichten der Außenseiten des Werkstücks ist ein Beschichtungsrahmen 16 vorgesehen, wobei im dargestellten Ausführungsbeispiel der Beschichtungsrahmen 16 das Werkstück vollständig umgibt und eine Öffnung aufweist, die die selbe Außenkontur wie das Werkstück 10 aufweist. Hierbei ist die Öffnung geringfügig größer als der Querschnitt des Werkstücks 10, so das an allen Seiten des Werkstücks zwischen diesem und dem Beschichtungsrahmen ein geringer Spalt 18 ausgebildet ist. Zur Beschichtung des Werkstücks 10 durch Naßlackierung durchläuft dieses in Richtung des Pfeils 12 den Beschichtungsrahmen 16.For coating the outer sides of the workpiece, a coating frame 16 is provided, wherein in the illustrated embodiment, the coating frame 16 completely surrounds the workpiece and has an opening which has the same outer contour as the workpiece 10. Here, the opening is slightly larger than the cross section of the workpiece 10, so that a small gap 18 is formed on all sides of the workpiece between this and the coating frame. For coating the workpiece 10 by wet painting, this passes through the coating frame 16 in the direction of the arrow 12.

Der Beschichtungsrahmen 16 weist im dargestellten Ausführungsbeispiel eine umlaufende Schlitzdüse 20 auf. Diese ist mit mehreren Zuführleitungen 22 zur Zufuhr des Beschichtungsmediums wie Lack verbunden. Die Zuführleitungen 22 sind mit einem Vorratsbehälter 24 verbunden, wobei das Zuführen des Beschichtungsmediums mittels einer Pumpe 26 erfolgt.The coating frame 16 has in the illustrated embodiment, a circumferential slot 20. This is connected to a plurality of supply lines 22 for supplying the coating medium such as paint. The supply lines 22 are connected to a reservoir 24, wherein the supply of the coating medium by means of a pump 26 takes place.

Unmittelbar benachbart zu der Schlitzdüse 20 ist innerhalb des Beschichtungsrahmens 16 eine umlaufende Absaugkammer 28 vorgesehen. In der Kammer 28 wird über eine Pumpe 30 ein Unterdruck erzeugt. Hierzu ist die Pumpe 30 über einen Schlauch 30 mit der Absaugkammer 28 verbunden. Das über die Absaugkammer 28 abgesaugte überschüssige Beschichtungsmedium wird von der Pumpe 30 wieder in den Vorratsbehälter 24 gefördert. Ggf. ist hier ein entsprechender Abscheider zwischengeschaltet.Immediately adjacent to the slot nozzle 20, a circumferential suction chamber 28 is provided within the coating frame 16. In the chamber 28, a negative pressure is generated by a pump 30. For this purpose, the pump 30 is connected via a hose 30 to the suction chamber 28. The extracted via the suction chamber 28 excess coating medium is conveyed by the pump 30 back into the reservoir 24. Possibly. Here is a corresponding separator interposed.

Erfindungsgemäß ist der Beschichtungsrahmen 16 mit einer Bewegungseinrichtung 34 verbunden, so dass der Beschichtungsrahmen 16 in Richtung eines Pfeils 36 hin- und herbewegt werden kann. Die Bewegung des Beschichtungsrahmens 16 erfolgt hierbei in Längsrichtung des Werkstücks 10, das heißt in Förderrichtung 12 des Werkstücks 10 oder entgegen der Förderrichtung.According to the invention, the coating frame 16 is connected to a movement device 34 so that the coating frame 16 can be moved back and forth in the direction of an arrow 36. The movement of the coating frame 16 takes place here in the longitudinal direction of the workpiece 10, that is to say in the conveying direction 12 of the workpiece 10 or counter to the conveying direction.

Zum Bewegen des Beschichtungsrahmens 16 weist die Bewegungseinrichtung im dargestellten Ausführungsbeispiel einen Hydraulik- und /oder Pneumatikzylinder 38 auf. Im dargestellten Ausführungsbeispiel ist der Kolben des Zylinders 38 unmittelbar mit dem Beschichtungsrahmen 16 verbunden. Über eine Steuereinrichtung 40 erfolgt ein Zu- und Abführen des Hydraulik- oder Pneumatikmediums zu der Kammer des Zylinders 38. Hierbei kann die Steuereinrichtung 40 insbesondere auch elektronische Bauteile aufweisen, die ggf. mit Sensoren verbunden sind, die beispielsweise die Bewegungsgeschwindigkeit des Werkstücks 10 und/oder die gepumpte Menge an Beschichtungsmedium und/oder die zurückgeführte Menge an Beschichtungsmedium messen.To move the coating frame 16, the movement device in the illustrated embodiment, a hydraulic and / or pneumatic cylinder 38. In the illustrated embodiment, the piston of the cylinder 38 is directly connected to the coating frame 16. By means of a control device 40, the hydraulic or pneumatic medium is supplied and removed to the chamber of the cylinder 38. In this case, the control device 40 can in particular also have electronic components that are possibly connected to sensors which, for example, measure the movement speed of the workpiece 10 and / or. or measure the amount of coating medium pumped and / or the amount of coating medium recycled.

Zum Hin- und Herbewegen des Beschichtungsrahmens 16 in Richtung eines Pfeils 36 ist dieser über ein Schlittenführung 42 geführt. Die Schlittenführung 42 weist insbesondere zwei zueinander parallel verlaufende rohrförmige Führungselemente 44 auf, an denen zwei, eine konkave Oberfläche aufweisende Rollen 46 anliegen. Die beiden Rollenpaare 46, die jeweils mit einem zylindrischen Führungselement 44 zusammenwirken, sind in einem mit dem Rahmen 16 verbundenen Halteelement 48 angeordnet.For reciprocating the coating frame 16 in the direction of an arrow 36, this is guided via a slide guide 42. The slide guide 42 has in particular two mutually parallel tubular guide elements 44, against which two, a concave surface having rollers 46. The two pairs of rollers 46, each cooperating with a cylindrical guide element 44, are arranged in a holding element 48 connected to the frame 16.

Die erfindungsgemäße Kombination des Bewegen des Werkstücks in Längsrichtung mit insbesondere hoher Geschwindigkeit in Verbindung mit einer Bewegung des Beschichtungsrahmens 16 in Längsrichtung, führt zu qualitativ hochwertigen Oberflächen.The combination according to the invention of moving the workpiece in the longitudinal direction, in particular at high speed, in conjunction with a movement of the coating frame 16 in the longitudinal direction, leads to high-quality surfaces.

Claims (16)

  1. Coating device for wet varnishing of elongated workpieces, comprising
    a transport means (14) for moving the workpieces (10) in the longitudinal direction (12) during coating,
    an application means (16) which, for coating the workpiece (10), comprises a coating frame (16) with at least one coating nozzle (20), said frame enclosing said workpiece at least partly during coating,
    characterized in that
    the application means (16) is provided with a movement means (34) for moving the application means (16) in the longitudinal direction (12) of the workpiece (10).
  2. Coating device of claim 1, characterized in that the movement means (34) comprises a control means (40) for reciprocating the application means (16).
  3. Coating device of claim 2, characterized in that the control means (40) is configured as a mechanical and/or electronic control means.
  4. Coating device of claim 2 or 3, characterized in that the control means (40) comprises a hydraulic and/or pneumatic cylinder (38).
  5. Coating device of one of claims 1 to 4, characterized in that the application means (16) is arranged on a carriage guide (42).
  6. Coating device of one of claims 1 to 5, characterized in that the coating nozzle (20) comprises a slotted nozzle.
  7. Coating device of one of claims 1 to 6, characterized in that the coating frame (16), and preferably the coating nozzle (20), encloses the workpiece (10) completely.
  8. Coating device of one of claims 1 to 7, characterized in that the coating frame (16) comprises a suction chamber (28).
  9. Coating device of claim 8, characterized in that the suction chamber (28) is immediately adjacent the coating nozzle (20).
  10. Coating device of one of claims 1 to 9, characterized in that the coating nozzle (20) is connected with one, preferably a plurality of supply lines (22) for supplying a coating medium, in particular varnish.
  11. Coating device of one of claims 8 to 10, characterized in that the suction chamber (28) is connected with a pump means (30).
  12. Method for coating elongated workpieces by wet varnishing, preferably by means of the coating device of one of claims 1 to 11, comprising the steps of:
    ○ moving the workpiece (10) in the longitudinal direction (12) thereof,
    ○ coating the workpiece (10) by means of an application means (16) having at least one coating nozzle (20), said application means comprising a coating frame that encloses the workpiece (10) at least partly during coating,
    ○ moving the application means (16) during coating.
  13. Method of claim 12, wherein the application means (16) is moved relative to the workpiece (10), in particular in the longitudinal direction (12) thereof.
  14. Method of claim 12 or 13, wherein the workpiece (10) is moved continually.
  15. Method of one of claims 12 to 14, wherein the application device (16) is moved intermittently.
  16. Method of one of claims 12 to 15, wherein excess coating medium is discharged in particular via a suction chamber (28) integrated in the coating frame (16) of the application device.
EP20100162526 2009-05-15 2010-05-11 Coating device and method for wet varnishing of elongated workpieces Not-in-force EP2253385B1 (en)

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