EP2150762B1 - Coating plant - Google Patents

Coating plant Download PDF

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Publication number
EP2150762B1
EP2150762B1 EP08749128.8A EP08749128A EP2150762B1 EP 2150762 B1 EP2150762 B1 EP 2150762B1 EP 08749128 A EP08749128 A EP 08749128A EP 2150762 B1 EP2150762 B1 EP 2150762B1
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EP
European Patent Office
Prior art keywords
workpieces
preheating
conveyor
coating plant
plant according
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EP08749128.8A
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German (de)
French (fr)
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EP2150762A1 (en
Inventor
Gerd Wurster
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/14—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by trays or racks or receptacles, which may be connected to endless chains or belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/008—Seals, locks, e.g. gas barriers or air curtains, for drying enclosures
    • 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
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
    • B05B13/0264—Overhead conveying means, i.e. the object or other work being suspended from the conveying means; Details thereof, e.g. hanging hooks
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders

Definitions

  • the invention relates to a coating system for painting or powder coating of workpieces, with a conveyor for conveying workpieces through at least one station designed as a dryer, in which the workpieces are heated, the dryer has a treatment chamber and a separate preheating chamber.
  • Such a coating plant according to the preamble of claim 1 with such a dryer is known from US 5,136,971 A known.
  • the workpieces first pass into a preheating zone by means of a conveyor and are then guided through a treatment chamber arranged therebelow, which is separated from the preheating chamber by a separating plate.
  • the preheat chamber and the treatment chamber have suitable heaters to maintain a certain temperature in the preheat chamber and in the treatment chamber.
  • a similar arrangement is from the GB 2 001 746 A known. Again, the workpieces are first passed through a preheating chamber and then get into an arranged below, spatially separate curing chamber. To Passing through the curing chamber finally reach the workpieces in a spatially separate cooling chamber.
  • the invention has the object to improve a coating system according to the aforementioned type such that the most efficient use of energy is guaranteed.
  • the conveyor in the preheating chamber has a preheating zone with two superimposed sections having an upper portion and a lower portion, and that the conveyor runs such that in the dryer incoming workpieces are moved in the preheating for preheating by the upper portion above the lower portion are moved by the expiring from the dryer, already heated workpieces from the treatment chamber.
  • a particularly effective preheating of the workpieces is achieved in the preheating by such workpieces that have previously passed through the treatment chamber and thus have a significantly higher temperature than the workpieces in the preheating zone.
  • the workpieces to be heated are moved in the opposite direction to the already warm workpieces.
  • the coating installation has at least one burner whose exhaust gases are supplied to the preheating workpieces in the preheating zone for heating.
  • the preheating zone is separated from a treatment chamber of the station by sealing air.
  • a heat exchanger which uses waste heat to heat a clean air flow, which is passed into the station.
  • the clean air heated by the heat exchanger is supplied as sealing air between the preheating zone and the treatment chamber.
  • a particularly energy-saving shielding of the treatment chamber against aggressive components of burner exhaust gases is ensured.
  • both the energy of the burner exhaust gases and the energy recovered from the heat exchanger can be used particularly efficiently.
  • the conveyor is preferably designed as a discontinuous conveyor, preferably as a power & free conveyor, which is designed for a single conveyance of workpieces.
  • the residence time of the workpieces to be preheated above the already heated workpieces can be significantly increased and the residence time of the workpieces in the preheating zone can be programmed. In this way, an improved preheating of the workpieces is ensured.
  • FIG. 1 is a coating system according to the invention, which is designed as a paint shop, designated overall by the numeral 10.
  • the entire coating plant has a number of stations, of which only one station 12, which is designed as a dryer, is shown for the sake of simplicity.
  • the station 12 has a treatment chamber 18 and a preheating chamber 14.
  • Workpieces 30 to be dried are fed into the preheating chamber 14 via an inlet 26 by a conveyor 24 designed as a Power & Free conveyor.
  • the workpieces 30 pass from the preheating chamber 14 into the treatment chamber (drying chamber) 18 in which they are dried at temperatures of about 200.degree.
  • the workpieces After passing through the treatment chamber 18, the workpieces in turn enter the preheating chamber 14, in which they preheat in the manner described below incoming (cold) workpieces and then discharged from the conveyor 24 via an outlet 28 again from the preheating chamber 14.
  • a preheating zone 16 is provided in which workpieces 30 (still cold) entering the station 12 are moved above workpieces 32 (still warm) coming out of the treatment chamber 18.
  • Arrangement and method of movement of the conveyor 24 in the region of the preheating zone 16 are now carried out so that as far as possible a larger number of workpieces 30 to be heated is arranged above an as large as possible number of warm workpieces 32.
  • the conveyor 24 leads cyclically newly supplied still cold workpieces 30 in the region of the preheating zone 16 above the hot workpieces 32. Further intermittently, the then preheated workpieces 30 are conveyed into the treatment chamber 18 after passing through the preheating zone 16. In a corresponding manner, the movement of the hot workpieces 32, which pass from the treatment chamber into the preheating zone 16 of the preheating chamber 14, takes place cyclically.
  • the time that the workpieces 30, 32 remain in the preheat zone 16 is programmable.
  • the time period for preheating the newly supplied workpieces 30 can be made as long as possible by the still warm workpieces 32 from the treatment chamber 18.
  • the length of the preheating zone 16 depends on the heat capacity of the workpieces and in particular on the desired efficiency in the preheating of the workpieces.
  • a further improved preheating of the newly supplied workpieces 30 is achieved in that the exhaust gases from burners 20, 22, which are used to heat the treatment chamber 18, are also used to preheat the workpieces 30.
  • the burner exhaust gases which usually have an exhaust gas temperature in the order of 300 ° C, delivered without waste heat to the environment because the burner exhaust gases for paints or powders usually contain harmful ingredients that could affect the quality of the coating.
  • the exhaust gases 34, 36 of the burners 20, 22 are fed via a line 38 into the preheating station 14 and output below the workpieces 30 to be heated via an air outlet 40, so that they can contribute directly to the preheating of the workpieces 30.
  • the barrier air flow emitted via the air outlet 50 is preheated via a heat exchanger 42.
  • the heat exchanger 42 uses energy which is extracted from an exhaust air flow 44 from the treatment chamber 18, for heating clean air 46, which may be fresh air, and which is supplied after heating via a line 48 to the air outlet 50.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft eine Beschichtungsanlage zum Lackieren oder Pulverbeschichten von Werkstücken, mit einem Förderer zur Förderung von Werkstücken durch mindestens eine als Trockner ausgebildete Station, in der die Werkstücke erwärmt werden, der Trockner eine Behandlungskammer und eine davon getrennte Vorwärmkammer aufweist.The invention relates to a coating system for painting or powder coating of workpieces, with a conveyor for conveying workpieces through at least one station designed as a dryer, in which the workpieces are heated, the dryer has a treatment chamber and a separate preheating chamber.

Eine derartige Beschichtungsanlage gemäß dem Oberbegriff des Anspruchs 1 mit einem derartigen Trockner ist aus der US 5,136,971 A bekannt.Such a coating plant according to the preamble of claim 1 with such a dryer is known from US 5,136,971 A known.

Bei der bekannten Anlage gelangen die Werkstücke mittels eines Förderers zunächst in eine Vorwärmzone und werden dann durch eine darunter angeordnete Behandlungskammer geführt, die von der Vorwärmkammer durch ein Trennblech getrennt ist. Die Vorwärmkammer und die Behandlungskammer verfügen über geeignete Heizeinrichtungen, um eine bestimmte Temperatur in der Vorwärmkammer und in der Behandlungskammer einzuhalten.In the known system, the workpieces first pass into a preheating zone by means of a conveyor and are then guided through a treatment chamber arranged therebelow, which is separated from the preheating chamber by a separating plate. The preheat chamber and the treatment chamber have suitable heaters to maintain a certain temperature in the preheat chamber and in the treatment chamber.

Eine ähnliche Anordnung ist aus der GB 2 001 746 A bekannt. Auch hierbei werden die Werkstücke zunächst durch eine Vorwärmkammer geführt und gelangen dann in eine darunter angeordnete, räumlich davon getrennte Aushärtungskammer. Nach Durchlaufen der Aushärtungskammer gelangen die Werkstücke schließlich in eine davon räumlich getrennte Kühlkammer.A similar arrangement is from the GB 2 001 746 A known. Again, the workpieces are first passed through a preheating chamber and then get into an arranged below, spatially separate curing chamber. To Passing through the curing chamber finally reach the workpieces in a spatially separate cooling chamber.

Bei den bekannten Ausführungen erfolgt keine effiziente Energienutzung.In the known designs, there is no efficient use of energy.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, eine Beschichtungsanlage gemäß der eingangs genannten Art derart zu verbessern, dass eine möglichst effiziente Energienutzung gewährleistet ist.Against this background, the invention has the object to improve a coating system according to the aforementioned type such that the most efficient use of energy is guaranteed.

Diese Aufgabe wird bei einer Beschichtungsanlage gemäß der eingangs genannten Art dadurch gelöst, dass der Förderer in der Vorwärmkammer eine Vorwärmzone mit zwei übereinander verlaufenden Abschnitten mit einem oberen Abschnitt und einem unteren Abschnitt aufweist, und dass der Förderer derart verläuft, dass in den Trockner einlaufende Werkstücke in der Vorwärmzone zur Vorwärmung durch den oberen Abschnitt oberhalb des unteren Abschnitts bewegt werden, durch den aus dem Trockner auslaufende, bereits erwärmte Werkstücke aus der Behandlungskammer bewegt werden.This object is achieved in a coating system according to the aforementioned type in that the conveyor in the preheating chamber has a preheating zone with two superimposed sections having an upper portion and a lower portion, and that the conveyor runs such that in the dryer incoming workpieces are moved in the preheating for preheating by the upper portion above the lower portion are moved by the expiring from the dryer, already heated workpieces from the treatment chamber.

Die Erfindung wird auf diese Weise vollkommen gelöst.The invention is completely solved in this way.

Erfindungsgemäß wird nämlich in der Vorwärmzone eine besonders effektive Vorwärmung der Werkstücke durch solche Werkstücke erreicht, die zuvor die Behandlungskammer durchlaufen haben und damit eine deutlich höhere Temperatur als die Werkstücke in der Vorwärmzone aufweisen. Dabei geben die warmen Werkstücke ihre Energie unter Ausnutzung von Konvektion unmittelbar an die noch kalten, vorzuwärmenden Werkstücke ab.According to the invention, a particularly effective preheating of the workpieces is achieved in the preheating by such workpieces that have previously passed through the treatment chamber and thus have a significantly higher temperature than the workpieces in the preheating zone. The warm workpieces, using convection, transfer their energy directly to the still cold, preheated workpieces.

Im Normalfall werden also die in die Station einlaufenden (noch kalten) Werkstücke durch die aus der Station auslaufenden (bereits erwärmten) Werkstücke vorgeheizt.Normally, the workpieces entering the station (still cold) are preheated by the workpieces leaving the station (already heated).

Grundsätzlich ist jedoch auch denkbar, dass die aus einer Station auslaufenden (bereits erwärmten) Werkstücke in die Vorheizzone einer weiteren Station bewegt werden, um darin andere Werkstücke vorzuheizen.In principle, however, it is also conceivable that the workpieces leaving a station (already heated) are moved into the preheating zone of another station in order to preheat other workpieces therein.

Gemäß einer Weiterbildung der Erfindung werden die zu erwärmenden Werkstücke in entgegengesetzter Richtung zu den bereits warmen Werkstücken bewegt.According to one embodiment of the invention, the workpieces to be heated are moved in the opposite direction to the already warm workpieces.

Auf diese Weise wird eine weiter verbesserte Energieübertragung ermöglicht.In this way, a further improved energy transfer is made possible.

Gemäß einer weiteren Ausgestaltung der Erfindung weist die Beschichtungsanlage mindestens einen Brenner auf, dessen Abgase den vorzuwärmenden Werkstücken in der Vorwärmzone zur Erwärmung zugeführt sind.According to a further embodiment of the invention, the coating installation has at least one burner whose exhaust gases are supplied to the preheating workpieces in the preheating zone for heating.

Auf diese Weise wird die relativ hohe Energie der Abgase eines Brenners, die üblicherweise mit etwa 300°C an die Umgebung abgegeben werden, zur Vorwärmung der Werkstücke genutzt.In this way, the relatively high energy of the exhaust gases of a burner, which are usually discharged at about 300 ° C to the environment, used to preheat the workpieces.

Gemäß einer Weiterbildung dieser Ausführung ist die Vorwärmzone von einer Behandlungskammer der Station durch Sperrluft abgetrennt.According to a development of this embodiment, the preheating zone is separated from a treatment chamber of the station by sealing air.

Auf diese Weise werden Qualitätseinbußen, die durch aggressive Bestandteile der Brennerabgase entstehen könnten, vermieden.In this way, quality losses, which could be caused by aggressive components of the burner exhaust gases avoided.

Gemäß einer weiteren Ausgestaltung der Erfindung ist ein Wärmetauscher vorgesehen, der Abwärme zur Erwärmung eines Reinluftstroms nutzt, der in die Station geleitet wird.According to a further embodiment of the invention, a heat exchanger is provided which uses waste heat to heat a clean air flow, which is passed into the station.

Auf diese Weise wird eine weitere Energieersparnis bewirkt.In this way, a further energy saving is effected.

Gemäß einer Weiterbildung dieser Ausführung wird die vom Wärmetauscher erwärmte Reinluft als Sperrluft zwischen der Vorwärmzone und der Behandlungskammer zugeführt. Auf diese Weise wird eine besonders energiesparende Abschirmung der Behandlungskammer gegenüber aggressiven Bestandteilen von Brennerabgasen gewährleistet. So kann sowohl die Energie der Brennerabgase als auch die vom Wärmetauscher wiedergewonnene Energie besonders effizient eingesetzt werden.According to a further development of this embodiment, the clean air heated by the heat exchanger is supplied as sealing air between the preheating zone and the treatment chamber. In this way, a particularly energy-saving shielding of the treatment chamber against aggressive components of burner exhaust gases is ensured. Thus, both the energy of the burner exhaust gases and the energy recovered from the heat exchanger can be used particularly efficiently.

Der Förderer ist vorzugsweise als diskontinuierlicher Förderer, vorzugsweise als Power & Free Förderer ausgebildet, der zu einer Einzelförderung von Werkstücken ausgebildet ist.The conveyor is preferably designed as a discontinuous conveyor, preferably as a power & free conveyor, which is designed for a single conveyance of workpieces.

Bei Verwendung eines derartigen Förderers kann die Verweildauer der vorzuwärmenden Werkstücke oberhalb der bereits erwärmten Werkstücke deutlich vergrößert werden und die Verweildauer der Werkstücke in der Vorwärmzone programmiert werden. Auf diese Weise wird eine verbesserte Vorwärmung der Werkstücke gewährleistet.When using such a conveyor, the residence time of the workpieces to be preheated above the already heated workpieces can be significantly increased and the residence time of the workpieces in the preheating zone can be programmed. In this way, an improved preheating of the workpieces is ensured.

Auf diese Weise wird ein sehr effizienter Wärmeübergang erreicht.In this way, a very efficient heat transfer is achieved.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale der Erfindung nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der Erfindung zu verlassen.It is understood that the features of the invention mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the invention.

Weitere Merkmale und Vorteile der Erfindung der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels unter Bezugnahme auf die Zeichnung.

Figur 1
zeigt eine erfindungsgemäße Beschichtungsanlage zum Lackieren von Werkstücken, wobei nur eine Station mit einer verbesserten Abwärmenutzung von Werkstücken schematisch dargestellt ist.
Further features and advantages of the invention of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings.
FIG. 1
shows a coating system according to the invention for painting of workpieces, wherein only one station with an improved waste heat utilization of workpieces is shown schematically.

In Figur 1 ist eine erfindungsgemäße Beschichtungsanlage, die als Lackieranlage ausgeführt ist, insgesamt mit der Ziffer 10 bezeichnet.In FIG. 1 is a coating system according to the invention, which is designed as a paint shop, designated overall by the numeral 10.

Die gesamte Beschichtungsanlage weist eine Reihe von Stationen auf, von denen der Einfachheit halber lediglich eine Station 12 dargestellt ist, die als Trockner ausgebildet ist. Die Station 12 weist eine Behandlungskammer 18 und eine Vorwärmkammer 14 auf. Zu trocknende Werkstücke 30 werden von einem Förderer 24, der als Power & Free Förderer ausgeführt ist, über einen Einlass 26 in die Vorwärmkammer 14 zugeführt. Die Werkstücke 30 gelangen von der Vorwärmkammer 14 in die Behandlungskammer (Trockenkammer) 18, in der sie bei Temperaturen von etwa 200°C getrocknet werden. Nach Durchlaufen der Behandlungskammer 18 gelangen die Werkstücke wiederum in die Vorwärmkammer 14, in der sie in nachfolgend noch beschriebener Weise einlaufende (kalte) Werkstücke vorwärmen und anschließend vom Förderer 24 über einen Auslass 28 wieder aus der Vorwärmkammer 14 ausgefördert werden.The entire coating plant has a number of stations, of which only one station 12, which is designed as a dryer, is shown for the sake of simplicity. The station 12 has a treatment chamber 18 and a preheating chamber 14. Workpieces 30 to be dried are fed into the preheating chamber 14 via an inlet 26 by a conveyor 24 designed as a Power & Free conveyor. The workpieces 30 pass from the preheating chamber 14 into the treatment chamber (drying chamber) 18 in which they are dried at temperatures of about 200.degree. After passing through the treatment chamber 18, the workpieces in turn enter the preheating chamber 14, in which they preheat in the manner described below incoming (cold) workpieces and then discharged from the conveyor 24 via an outlet 28 again from the preheating chamber 14.

Innerhalb der Vorwärmkammer 14 ist eine Vorwärmzone 16 vorgesehen, in der in die Station 12 einlaufende (noch kalte) Werkstücke 30 oberhalb von aus der Behandlungskammer 18 kommenden (noch warmen) Werkstücken 32 bewegt werden. Anordnung und Verfahrweise des Förderers 24 im Bereich der Vorwärmzone 16 erfolgen nun so, dass möglichst immer eine größere Anzahl von zu erwärmenden Werkstücken 30 oberhalb von einer möglichst gleich großen Anzahl von warmen Werkstücken 32 angeordnet ist. Der Förderer 24 führt hierzu taktweise neu zugeführte noch kalte Werkstücke 30 in den Bereich der Vorwärmzone 16 oberhalb der warmen Werkstücke 32. Weiterhin taktweise werden nach Durchlaufen der Vorwärmzone 16 die dann vorgewärmten Werkstücke 30 in die Behandlungskammer 18 gefördert. In entsprechender Weise erfolgt die Bewegung der warmen Werkstücke 32, die aus der Behandlungskammer in die Vorwärmzone 16 der Vorwärmkammer 14 gelangen, taktweise.Within the preheating chamber 14, a preheating zone 16 is provided in which workpieces 30 (still cold) entering the station 12 are moved above workpieces 32 (still warm) coming out of the treatment chamber 18. Arrangement and method of movement of the conveyor 24 in the region of the preheating zone 16 are now carried out so that as far as possible a larger number of workpieces 30 to be heated is arranged above an as large as possible number of warm workpieces 32. The conveyor 24 leads cyclically newly supplied still cold workpieces 30 in the region of the preheating zone 16 above the hot workpieces 32. Further intermittently, the then preheated workpieces 30 are conveyed into the treatment chamber 18 after passing through the preheating zone 16. In a corresponding manner, the movement of the hot workpieces 32, which pass from the treatment chamber into the preheating zone 16 of the preheating chamber 14, takes place cyclically.

Die Zeit, die die Werkstücke 30, 32 in der Vorwärmzone 16 verbleiben, ist programmierbar.The time that the workpieces 30, 32 remain in the preheat zone 16 is programmable.

Auf diese Weise kann die Zeitspanne zur Vorwärmung der neu zugeführten Werkstücke 30 durch die noch warmen Werkstücke 32 aus der Behandlungskammer 18 möglichst lang ausgestaltet werden.In this way, the time period for preheating the newly supplied workpieces 30 can be made as long as possible by the still warm workpieces 32 from the treatment chamber 18.

Die Länge der Vorwärmzone 16 hängt von der Wärmekapazität der Werkstücke und insbesondere vom gewünschten Wirkungsgrad bei der Vorwärmung der Werkstücke ab.The length of the preheating zone 16 depends on the heat capacity of the workpieces and in particular on the desired efficiency in the preheating of the workpieces.

Eine weiter verbesserte Vorwärmung der neu zugeführten Werkstücke 30 wird dadurch erreicht, dass die Abgase von Brennern 20, 22, die zur Beheizung der Behandlungskammer 18 verwendet werden, gleichfalls zur Vorwärmung der Werkstücke 30 genutzt werden.A further improved preheating of the newly supplied workpieces 30 is achieved in that the exhaust gases from burners 20, 22, which are used to heat the treatment chamber 18, are also used to preheat the workpieces 30.

In herkömmlichen Anlagen werden die Brennerabgase, die meist eine Abgastemperatur in der Größenordnung von 300°C haben, ohne Abwärmenutzung an die Umgebung abgegeben, da die Brennerabgase für Lacke oder Pulver meist schädliche Bestandteile enthalten, die die Qualität der Beschichtung beeinträchtigen könnten.In conventional systems, the burner exhaust gases, which usually have an exhaust gas temperature in the order of 300 ° C, delivered without waste heat to the environment because the burner exhaust gases for paints or powders usually contain harmful ingredients that could affect the quality of the coating.

Erfindungsgemäß werden die Abgase 34, 36 der Brenner 20, 22 über eine Leitung 38 in die Vorwärmstation 14 zugeführt und unterhalb der zu erwärmenden Werkstücke 30 über einen Luftauslass 40 ausgegeben, so dass sie unmittelbar zur Vorwärmung der Werkstücke 30 beitragen können.According to the invention, the exhaust gases 34, 36 of the burners 20, 22 are fed via a line 38 into the preheating station 14 and output below the workpieces 30 to be heated via an air outlet 40, so that they can contribute directly to the preheating of the workpieces 30.

Um zu vermeiden, dass aggressive Bestandteile der Brennerabgase zu Qualitätseinbußen bei der Beschichtung der Werkstücke führen, ist die Behandlungskammer 18, in der die Werkstücke bei Temperaturen von etwa 200°C getrocknet werden, von der Vorwärmkammer 14 durch einen Sperrluftstrom abgeschottet, der über einen Luftauslass 50 am Übergang zwischen der Vorwärmkammer 14 und der Behandlungskammer 18 ausströmt. Der über den Luftauslass 50 ausgegebene Sperrluftstrom wird über einen Wärmetauscher 42 vorgewärmt. Der Wärmetauscher 42 benutzt Energie, die einem Abluftstrom 44 aus der Behandlungskammer 18 entzogen wird, zur Erwärmung von Reinluft 46, bei der es sich um Frischluft handeln kann, und die nach Erwärmung über eine Leitung 48 zum Luftauslass 50 zugeführt ist. Über den Luftauslass 50 ausströmende Sperrluft, die über eine Vielzahl von Luftschlitzen ausströmt, wird somit ein warmer Sperrluftstrom ausgegeben, durch den die Atmosphären in der Vorwärmkammer 14 und der Behandlungskammer 18 praktisch vollständig abgetrennt werden, wobei zusätzlich die Sperrluft noch zur Beheizung verwendet wird.In order to avoid that aggressive components of the burner exhaust gases lead to deterioration in the coating of the workpieces, the treatment chamber 18, in which the workpieces are dried at temperatures of about 200 ° C, from the preheating chamber 14 by a barrier air flow, which via an air outlet 50 at the transition between the preheating chamber 14 and the treatment chamber 18 flows out. The barrier air flow emitted via the air outlet 50 is preheated via a heat exchanger 42. The heat exchanger 42 uses energy which is extracted from an exhaust air flow 44 from the treatment chamber 18, for heating clean air 46, which may be fresh air, and which is supplied after heating via a line 48 to the air outlet 50. Over the air outlet 50 outflowing barrier air, which flows through a plurality of louvers, thus a warm barrier air flow is issued, through which the atmospheres in the preheating chamber 14 and the treatment chamber 18 are almost completely separated, in addition, the sealing air is still used for heating.

Claims (8)

  1. Coating plant for the painting or powder coating of workpieces, with a conveyor (24) for conveying workpieces (30, 32) through at least one station, which is formed as a dryer (12) and in which the workpieces (30, 32) are heated, the dryer (12) having a treatment chamber (18) and a preheating chamber (14) separate therefrom, characterized in that the conveyor (24) has in the preheating chamber (14) a preheating zone (16) with two sections running one over the other, comprising an upper section and a lower section, and in that the conveyor (24) runs in such a way that workpieces (30) entering the dryer (12) are moved through the upper section above the lower section in the preheating zone (16) for preheating, while already heated workpieces (32) leaving the dryer (12) are moved out of the treatment chamber (18) through the lower section.
  2. Coating plant according to Claim 1, in which the workpieces (30) to be preheated are moved in the opposite direction to the already heated workpieces (32).
  3. Coating plant according to Claim 1 or 2, with at least one burner (20, 22), the exhaust gases (34, 36) of which are fed to the workpieces (30) to be preheated in the preheating zone (16) for heating.
  4. Coating plant according to Claim 3, in which the preheating zone (16) is separated from a treatment chamber (18) of the station (12) by barrier air.
  5. Coating plant according to Claim 4, with a heat exchanger (42), which uses waste heat for heating a stream of clean air (46), which is conducted into the dryer (12).
  6. Coating plant according to Claim 5, in which the heated clean air is fed as barrier air between the preheating zone (16) and the treatment chamber (18).
  7. Coating plant according to one of the preceding claims, in which the conveyor (24) is formed as a discontinuous conveyor, preferably as a power & free conveyor, which is formed for a single conveyance of workpieces (30, 32).
  8. Coating plant according to one of the preceding claims, in which the residence time of the workpieces (30, 32) in the preheating zone (16) is programmable.
EP08749128.8A 2007-04-27 2008-04-25 Coating plant Not-in-force EP2150762B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007020909A DE102007020909B4 (en) 2007-04-27 2007-04-27 coating plant
PCT/EP2008/003348 WO2008131917A1 (en) 2007-04-27 2008-04-25 Coating plant

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EP2150762A1 EP2150762A1 (en) 2010-02-10
EP2150762B1 true EP2150762B1 (en) 2013-10-02

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EP08749128.8A Not-in-force EP2150762B1 (en) 2007-04-27 2008-04-25 Coating plant

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EP (1) EP2150762B1 (en)
DE (1) DE102007020909B4 (en)
WO (1) WO2008131917A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012222688A1 (en) 2012-12-11 2014-06-12 Bayerische Motoren Werke Aktiengesellschaft Through-flow drying unit for thermal curing of paints or adhesives to automobile components, has heating zones that are coupled to individual cooling zones to transfer heat through cooling zone

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965551A (en) * 1975-08-14 1976-06-29 Allied Tube & Conduit Corporation Production of polymer-coated steel tubing
AU521619B2 (en) 1977-07-27 1982-04-22 Sun Chemical Corporation Direct flame drying apparatus
DE3436055C1 (en) * 1984-10-02 1986-02-27 Ludwig Riedhammer GmbH, 8500 Nürnberg Industrial furnace/dryer combination
DE3840413C1 (en) * 1988-11-30 1990-04-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De Installation for sheathing electrical components in plastic by the fluidised bed coating process
US5136971A (en) 1990-12-27 1992-08-11 Metokote Corporation Apparatus for transporting articles
US5565240A (en) * 1992-05-14 1996-10-15 Sanderson Plumbing Products, Inc. Process for producing powder coated plastic product
DE19635709A1 (en) * 1996-09-03 1998-03-05 Ema Elektro Maschinen Schultze Process for coating a workpiece

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DE102007020909A1 (en) 2008-10-30
DE102007020909B4 (en) 2013-09-05
EP2150762A1 (en) 2010-02-10
WO2008131917A1 (en) 2008-11-06

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