EP2010849B1 - Device for stoving an enamel layer and method for controlling the temperature - Google Patents

Device for stoving an enamel layer and method for controlling the temperature Download PDF

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Publication number
EP2010849B1
EP2010849B1 EP07718394.5A EP07718394A EP2010849B1 EP 2010849 B1 EP2010849 B1 EP 2010849B1 EP 07718394 A EP07718394 A EP 07718394A EP 2010849 B1 EP2010849 B1 EP 2010849B1
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Prior art keywords
circulating air
temperature
air flow
air fan
wire
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EP07718394.5A
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German (de)
French (fr)
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EP2010849A1 (en
Inventor
Gerald Pascher
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Nhkm Consulting GmbH
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Nhkm Consulting GmbH
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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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/20—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/001—Drying and oxidising yarns, ribbons or the like
    • F26B13/002—Drying coated, e.g. enamelled, varnished, wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • 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
    • B05D3/0254—After-treatment
    • 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
    • B05D3/04—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 exposure to gases
    • B05D3/0406—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 exposure to gases the gas being air
    • B05D3/0413—Heating with air

Definitions

  • the invention relates to a device for baking a lacquer layer on a wire with a Einbrennzone having a duct for the wire, a circulating air fan for generating a guided through the duct and circulated through an air duct circulating air flow and an exhaust fan for discharging an exhaust air flow is provided from the circulating air flow, so that at the inlet and at the outlet of the passage channel fresh air for baking the paint nachströmt ..
  • the invention relates to a method for controlling the temperature in a Einbrennzone a wire passage channel of a Lackeinbrennofens, wherein through the wire passage channel Circulating air flow is passed, which is guided in a circle, wherein exhaust air stream is sucked from the circulating air flow, so that at an inlet and an outlet of the passage channel fresh air flows into the passage channel.
  • Such devices or methods for baking a still liquid lacquer layer on a wire are known as Lackeinbrennöfen of Drahtlackieranlagen, in which the previously applied in liquid form to the bare wire coating is heated so that the solvents contained in the paint evaporate and the remaining solids a forming insulating cladding of wire.
  • the wire is guided with the still liquid paint layer at the beginning through a passage channel having a Einbrennzone in which the functionally essential part of the wire heating is performed.
  • thermal energy is introduced into the burn-in zone via the circulating-air flow, the circulating-air flow being circulated, resulting in a circulating-air circuit.
  • From the DE 37 17 166 A1 is a device and a method of the type mentioned for drying an elongated material and an arrangement for carrying out the method known.
  • a small air flow is diverted from the main air flow and fed to a cleaning device with heating.
  • An actuator regulates the airflow.
  • the desired stoving temperature is achieved here by a change in the speed of a circulating fan, wherein the rotational speed is regulated as a function of the determined temperature in the stoving zone.
  • thermocouples regulate the speed of the fans, which regulate the amount of exhaust air and the supply of cold air.
  • Other thermocouples regulate the speed of another blower, which introduces fresh air into the main chamber.
  • the blowers is in this case a thermocouple assigned over which the speed is controlled in dependence on the measured temperature; this thermocouple is located outside the burn-in zone.
  • Another thermocouple which is arranged within the Einbrennzone, is provided for controlling the speed of a fresh air blower.
  • a device for the production of enameled wires with hot melt resins contains, inter alia, a controllable circulating air fan and a controllable exhaust fan.
  • the amount of circulating air is controlled by the speed of the circulating air fan; the temperature is influenced by means of an adjustable flap, which regulates the resistance of the circulating air.
  • a method and apparatus for drying stacked lumber wherein heated air is circulated within a drying chamber that receives the lumber stacks.
  • a rational and optimal drying is obtained by selecting the circulation rate as a function of the respective difference between air temperature and / or air humidity between stacking and stacking outlet in the sense of an adaptation of the actual difference values to predetermined desired difference values.
  • From the DE 32 45 583 A1 is a method for energy saving in the heat treatment, especially in drying or thermal treatment of moving webs known.
  • the energy saving is achieved in that the heat energy in the passage of webs by the treatment of a maximum value as treatment progresses, depending on the nature of the web.
  • the treatment agent flow for example, the speed of the drive motors of the circulation fans, is reduced to the web.
  • the aim of the present invention is to provide a device or a method of the type mentioned, by which or for which different predetermined temperatures in the Einbrennzone the most optimal air flow for baking the paint on the wire is created.
  • a speed control of the circulating air fan or the exhaust fan is provided in response to an adjustable setpoint of the temperature in the Einbrennzone, wherein the set value of the temperature in the burn-in zone is assigned a rotational speed value of the circulating-air ventilator or of the exhaust-air ventilator.
  • a rotational speed value of the circulating-air ventilator or exhaust fan is assigned to the nominal value of the temperature in the stoving zone, so that a simple control results, in which a direct relationship between the temperature setpoint and the rotational speed values of the circulating air and / or or given the exhaust fan.
  • a particularly simple assignment of the temperature setpoints and the rotational speed values of the circulating air and / or the exhaust air fan is given if the mutually associated desired values of the temperature and the rotational speed values of the circulating air fan or the exhaust fan are stored on a data carrier.
  • the desired value of the temperature between 20 ° C and 1000 ° C, in particular between 50 ° C and 800 ° C, is.
  • the circulating air stream is assigned a heating device.
  • the object of the invention can be achieved with a method of the initially mentioned type, wherein a circulating air flow is passed through the wire passage channel, which is circulated, wherein exhaust air is sucked from the circulating air flow, so that at an inlet and an outlet of the passage channel Fresh air in the passage channels nachströmt, and the pressure of the recirculating air flow or the suction pressure of the exhaust air flow is controlled in response to an adjustable setpoint of the temperature in the Einbrennzone, wherein the target value of the temperature in the Einbrennzone a speed value of the recirculation fan or the exhaust air
  • By changing the pressure of the recirculating air flow or the suction pressure of the exhaust air flow can thus change the air density at a changed Temperature in the baking zone are taken into account, so that there are optimal conditions at different temperatures in the baking zone.
  • the circulating air flow is directed counter to the direction of passage of the wire through the passage channel.
  • Fig. 1 a partially sectioned view of a Lackeinbrennofens with a guided through a passage channel wire.
  • a paint baking oven 1 which has a passage channel 2, through which a wire 3 is guided in the direction of passage 4.
  • the wire 3 enters this case at an inlet 5 in the passage channel 2 and leaves the passage channel 2 at an outlet 6.
  • inlet and outlet can thus, as outlined with arrows 5 ', 6', fresh air enter the passage channel 2, so that optimal conditions for baking the paint on the wire 3 are present in the region of a burn-in zone 8 of the passage channel 2.
  • the recirculating air stream 7 is hereby circulated in a substantially closed air guiding system 9, so that a circulating air circuit results.
  • a heating device 10 is accommodated, so that the circulating air flow 7 is supplied with the heat energy required for the evaporation of the solvent of the paint.
  • a circulating air fan 11 is provided.
  • an exhaust duct 12 is connected, via which with the aid of an exhaust fan 13, a partial flow, namely the exhaust air flow, is derived in the direction of arrow 14 from the circulating air. With the aid of the exhaust fan 13, such an amount of exhaust air is sucked off, so that at the inlet 5 and at the outlet 6, the fresh air 5 ', 6' suitable for efficient stoving of the paint flows into the through-channel 2.
  • the circulating air fan 11 and the exhaust fan 13 are controlled by a speed control 15, via the speed control 15, the respective speed values of Fans 11 and 13 depending on the desired setpoint the temperature in the region of the baking zone 8 are fixed.
  • the speed control 15 has a table (see below) stored on a data carrier, so that a specific speed of the circulating air fan 11 and the exhaust fan 13 are assigned to the desired temperature setpoint.
  • Automatic air adjustment T [° C] Recirculation fan [rpm] Exhaust fan [rpm] 50 3100 1500 100 3200 1700 150 3300 1900 200 3400 2100 250 3500 2300 300 3600 2500 350 3700 2700 400 3800 2900 450 3900 3100 500 4000 3300 550 4100 3500 600 4200 3700 650 4300 3900 700 4400 4100 750 4500 4300 800 4600 4500

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Einbrennen einer Lackschicht auf einem Draht mit einem eine Einbrennzone aufweisenden Durchzugskanal für den Draht, ein Umluft-Ventilator zum Erzeugen eines durch den Durchzugskanal geleiteten und über ein Luftführsystem im Kreis geführten Umluftstroms sowie ein Abluft-Ventilator zum Ableiten eines Abluftstroms aus dem Umluftstrom vorgesehen ist, so dass am Einlauf und am Auslauf des Durchzugskanals Frischluft zum Einbrennen des Lacks nachströmt.. Weiters betrifft die Erfindung ein Verfahren zur Steuerung der Temperatur in einer Einbrennzone eines Draht-Durchzugskanals eines Lackeinbrennofens, wobei durch den Draht-Durchzugskanal ein Umluftstrom geleitet wird, der im Kreis geführt wird, wobei Abluftstrom aus dem Umluftstrom abgesaugt wird, so dass an einem Einlauf und einem Auslaufdes Durchzugskanals Frischluft in den Durchzugskanals nachströmt.The invention relates to a device for baking a lacquer layer on a wire with a Einbrennzone having a duct for the wire, a circulating air fan for generating a guided through the duct and circulated through an air duct circulating air flow and an exhaust fan for discharging an exhaust air flow is provided from the circulating air flow, so that at the inlet and at the outlet of the passage channel fresh air for baking the paint nachströmt .. Furthermore, the invention relates to a method for controlling the temperature in a Einbrennzone a wire passage channel of a Lackeinbrennofens, wherein through the wire passage channel Circulating air flow is passed, which is guided in a circle, wherein exhaust air stream is sucked from the circulating air flow, so that at an inlet and an outlet of the passage channel fresh air flows into the passage channel.

Derartige Vorrichtungen bzw. Verfahren zum Einbrennen einer noch flüssigen Lackschicht auf einem Draht sind als Lackeinbrennöfen von Drahtlackieranlagen bekannt, bei welchen der zuvor in flüssiger Form auf den blanken Draht aufgebrachte Lack so erhitzt wird, dass die im Lack enthaltenen Lösungsmittel verdampfen und die verbleibenden Festkörper eine isolierende Umhüllung des Drahtes bilden. Hierdurch wird der Draht mit der zu Beginn noch flüssigen Lackschicht durch einen Durchzugskanal geführt, welcher eine Einbrennzone aufweist, in welcher der funktionell wesentlichste Teil der Drahterhitzung durchgeführt wird. Hierzu wird über den Umluftstrom Wärmeenergie in die Einbrennzone eingebracht, wobei der Umluftstrom im Kreis geführt wird, so dass sich ein Umfluftkreis ergibt. Aus diesem Umluftkreis wird ein Teilstrom, nämlich der Abluftstrom, abgesaugt, so dass die für das Verdampfen der Lösungsmittel bzw. das Einbrennen der verbleibenden Festkörper auf dem Draht nötige Frischluft im Ein- bzw. Auslauf des Durchzugskanals der Vorrichtung nachströmt.Such devices or methods for baking a still liquid lacquer layer on a wire are known as Lackeinbrennöfen of Drahtlackieranlagen, in which the previously applied in liquid form to the bare wire coating is heated so that the solvents contained in the paint evaporate and the remaining solids a forming insulating cladding of wire. As a result, the wire is guided with the still liquid paint layer at the beginning through a passage channel having a Einbrennzone in which the functionally essential part of the wire heating is performed. For this purpose, thermal energy is introduced into the burn-in zone via the circulating-air flow, the circulating-air flow being circulated, resulting in a circulating-air circuit. For this circulating air circuit, a partial flow, namely the exhaust air stream, is sucked off, so that the necessary for the evaporation of the solvent or the burning of the remaining solids on the wire fresh air in the inlet or outlet of the passage channel of the device nachströmt.

Bei bekannten Lackeinbrennöfen ist üblicherweise ein Nennarbeitspunkt, z.B. von ca. 700°, in der Einbrennzone vorgesehen. Bezüglich dieses Nennarbeitspunktes werden die Drehzahlen des Umluft-Ventilators und des Abluft-Ventilators so eingestellt, dass die gewünschte Luftströmung erzielt wird. Somit werden möglichst optimale Strömungsbedingungen der Einbrennzone bei dieser speziellen Temperatur erzielt.In known paint baking ovens usually a nominal operating point, for example of about 700 °, provided in the baking zone. With regard to this nominal working point, the rotational speeds of the Recirculation fan and exhaust fan adjusted to achieve the desired airflow. Thus, the best possible flow conditions of the stoving zone are achieved at this particular temperature.

Wenn jedoch die Temperatur in der Einbrennzone hoch oder heruntergefahren wird bzw. ein anderer Draht bzw. ein anderer Lack verwendet wird, so dass eine andere Temperatur in der Einbrennzone vorgesehen ist, verschlechtert sich aufgrund der Änderung der Dichte der Umluft bei veränderter Temperatur in der Einbrennzone die Luftströmung signifikant. Demzufolge ist ein optimaler Betrieb der Vorrichtung zum Einbrennen der Lackschicht bei anderen Temperaturen als einer speziellen Nennarbeitstemperatur bisher nicht möglich.However, if the temperature in the stoving zone is raised or lowered or another wire or varnish is used so that a different temperature is provided in the stoving zone, the change in the density of the circulating air will be impaired as the temperature in the stoving zone changes the air flow significantly. Consequently, optimal operation of the device for baking the lacquer layer at temperatures other than a specific nominal working temperature has hitherto not been possible.

Aus der DE 37 17 166 A1 ist eine Vorrichtung und ein Verfahren der eingangs angeführten Art zur Trocknung eines langgestreckten Gutes und eine Anordnung zur Durchführung des Verfahrens bekannt. Hier wird ein kleiner Luftstrom vom Hauptluftstrom abgezweigt und einer Reinigungseinrichtung mit Heizeinrichtung zugeführt. Dabei reguliert ein Stellorgan den Luftstrom.From the DE 37 17 166 A1 is a device and a method of the type mentioned for drying an elongated material and an arrangement for carrying out the method known. Here, a small air flow is diverted from the main air flow and fed to a cleaning device with heating. An actuator regulates the airflow.

Aus der EP 0 162 941 sind eine Vorrichtung und ein Verfahren zur Regelung der Einbrenntemperatur eines Einbrennofens für Lackdrahtherstellung bekannt. Die gewünschte Einbrenntemperatur wird hierbei durch eine Drehzahländerung eines Umwälzgebläses erzielt, wobei die Drehzahl in Abhängigkeit von der ermittelten Temperatur in der Einbrennzone geregelt wird.From the EP 0 162 941 are known an apparatus and a method for controlling the baking temperature of a baking oven for enameled wire production. The desired stoving temperature is achieved here by a change in the speed of a circulating fan, wherein the rotational speed is regulated as a function of the determined temperature in the stoving zone.

Aus der DE 38 02 476 A1 ist eine Ofeneinrichtung zum Erhitzen von drahtartigen Produkten bekannt. Hier wird der Luftstrom von vier Gebläsen gesteuert, wobei zwei Gebläse die Frischluftzufuhr regeln, ein Gebläse einen Teilstrom aus der Hauptkammer absaugt und ein weiteres Gebläse die Abluft zu einem Kamin leitet. Thermoelemente regeln die Drehzahl der Gebläse, welche die Abluftmenge und die Zufuhr von Kaltluft regulieren. Weitere Thermoelemente regeln die Drehzahl eines weiteren Gebläses, welches Frischluft in die Hauptkammer einleitet. Den Gebläsen ist hierbei ein Thermoelement zugeordnet, über welches in Abhängigkeit von der gemessenen Temperatur die Drehzahl geregelt wird; dieses Thermoelement ist außerhalb der Einbrennzone angeordnet. Ein weiteres Thermoelement, welches innerhalb der Einbrennzone angeordnet ist, ist zur Regelung der Drehzahl eines Frischluftgebläses vorgesehen.From the DE 38 02 476 A1 For example, a furnace device for heating wire-type products is known. Here, the air flow is controlled by four blowers, with two fans regulate the supply of fresh air, a fan sucks a partial flow from the main chamber and another blower directs the exhaust air to a chimney. Thermocouples regulate the speed of the fans, which regulate the amount of exhaust air and the supply of cold air. Other thermocouples regulate the speed of another blower, which introduces fresh air into the main chamber. The blowers is in this case a thermocouple assigned over which the speed is controlled in dependence on the measured temperature; this thermocouple is located outside the burn-in zone. Another thermocouple, which is arranged within the Einbrennzone, is provided for controlling the speed of a fresh air blower.

Aus der DE 38 35 641 ist ein andersartiges Verfahren und eine Vorrichtung zur Steuerung und Überwachung des Trocknungsprozesses unterschiedlicher Papier- und Kartonprodukte bekannt, wobei die Trocknung in einem Luftverteilungssystem erfolgt, in dem die Luftgeschwindigkeit der Blasströmungen einer Sortenkartei entnommen wird. Die Sortenkartei enthält hierbei sortenspezifische Sollparameterreihen, die unter anderem die Temperatur der Blasluft umfassen.From the DE 38 35 641 a different method and a device for controlling and monitoring the drying process of different paper and board products is known, wherein the drying takes place in an air distribution system in which the air velocity of the blowing flows is taken from a variety index. The variety index here contains variety-specific nominal parameter series, which include, inter alia, the temperature of the blown air.

Aus der EP 0 448 999 A2 ist eine Vorrichtung zur Herstellung von Lackdrähten mit Schmelzharzen bekannt. Diese Vorrichtung enthält u.a. einen regelbaren Umluftventilator und einen regelbaren Abgasventilator. Die Umluftmenge wird durch die Drehzahl des Umluftventilators geregelt; die Temperatur wird mittels einer einstellbaren Klappe, die den Widerstand der Umluft regelt, beeinflusst.From the EP 0 448 999 A2 a device for the production of enameled wires with hot melt resins is known. This device contains, inter alia, a controllable circulating air fan and a controllable exhaust fan. The amount of circulating air is controlled by the speed of the circulating air fan; the temperature is influenced by means of an adjustable flap, which regulates the resistance of the circulating air.

Aus der AT 002 342 U1 sind ein Verfahren und eine Vorrichtung zum Trocknen von gestapeltem Schnittholz bekannt, wobei erwärmte Luft innerhalb einer Trockenkammer, welche die Holzstapel aufnimmt, umgewälzt wird. Ein rationales und optimales Trocknen wird erhalten, indem die Umwälzgeschwindigkeit in Abhängigkeit von der jeweiligen Differenz zwischen Lufttemperatur und/oder Luftfeuchtigkeit zwischen Stapelein- und Stapelaustritt im Sinne einer Anpassung der IST-Differenzwerte an vorgegebene SOLL-Differenzwerte ausgewählt wird.From the AT 002 342 U1 For example, a method and apparatus for drying stacked lumber is known wherein heated air is circulated within a drying chamber that receives the lumber stacks. A rational and optimal drying is obtained by selecting the circulation rate as a function of the respective difference between air temperature and / or air humidity between stacking and stacking outlet in the sense of an adaptation of the actual difference values to predetermined desired difference values.

Aus der DE 32 45 583 A1 ist ein Verfahren zur Energieeinsparung bei der Wärmebehandlung, insbesondere bei Trocknungs- oder Thermobehandlung von laufenden Warenbahnen bekannt. Die Energieeinsparung wird dadurch erzielt, dass die Wärmeenergie beim Durchlauf von Warenbahnen durch die Behandlung von einem Maximalwert mit fortschreitender Behandlung, je nach Beschaffenheit der Bahn, verringert wird. Vorzugsweise wird dabei der Behandlungsmittelstrom, z.B. die Drehzahl der Antriebsmotoren der Umlaufventilatoren, auf die Warenbahn verringert.From the DE 32 45 583 A1 is a method for energy saving in the heat treatment, especially in drying or thermal treatment of moving webs known. The energy saving is achieved in that the heat energy in the passage of webs by the treatment of a maximum value as treatment progresses, depending on the nature of the web. Preferably, the treatment agent flow, for example, the speed of the drive motors of the circulation fans, is reduced to the web.

Aus der US 4 087 568 sind ein Verfahren und eine Vorrichtung zum Regeln einer Materialbehandlung bei maximalem Durchsatz mittels Ventilationsleistungskontrolle bekannt, wobei die Harzbehandlung einer Stoffbahn bei maximalem Durchsatz im Trockner durchgeführt wird. Es können dabei der maximale Durchsatz und das gewünschte Trocknungsniveau erzielt werden, während die gewünschte maximale Stofftemperatur nicht überschritten wird. Wie auch bei DE 32 45 583 A1 wird auch hier die Ventilatordrehzahl geregelt.From the US 4 087 568 For example, a method and apparatus for controlling material handling at maximum throughput by means of ventilation performance control is known wherein the resin treatment of a web is performed at maximum throughput in the dryer. The maximum throughput and the desired drying level can be achieved while the desired maximum fabric temperature is not exceeded. As with DE 32 45 583 A1 Here, too, the fan speed is regulated.

Ziel der vorliegenden Erfindung ist es eine Vorrichtung bzw. ein Verfahren der eingangs angeführten Art zu schaffen, durch welche bzw. welches für unterschiedliche vorbestimmte Temperaturen in der Einbrennzone eine möglichst optimale Luftströmung zum Einbrennen des Lacks auf dem Draht geschaffen wird.The aim of the present invention is to provide a device or a method of the type mentioned, by which or for which different predetermined temperatures in the Einbrennzone the most optimal air flow for baking the paint on the wire is created.

Erfindungsgemäß wird dies bei der Vorrichtung der eingangs angeführten Art dadurch erzielt, dass, wobei eine Drehzahl-Steuerung des Umluft-Ventilators bzw. des Abluft-Ventilators in Abhängigkeit von einem einstellbaren Sollwert der Temperatur in der Einbrennzone vorgesehen ist, wobei dem Sollwert der Temperatur in der Einbrennzone ein Drehzahlwert des Umluft-Ventilators bzw. des Abluft-Ventilators zugeordnet ist. Durch die Steuerung der Drehzahl des Umluft-Ventilators und/oder des Abluft-Ventilators kann somit je nach dem, welche Temperatur in der Einbrennzone gewünscht wird, die Leistung des Umluft und/oder des Abluft-Ventilators derart eingestellt werden, dass bezüglich der veränderten Luftdichte aufgrund der veränderten Temperatur in der Einbrennzone weiterhin optimale Bedingungen zum Einbrennen der Lackschicht auf dem Draht vorliegen.According to the invention this is achieved in the device of the type mentioned in that, wherein a speed control of the circulating air fan or the exhaust fan is provided in response to an adjustable setpoint of the temperature in the Einbrennzone, wherein the set value of the temperature in the burn-in zone is assigned a rotational speed value of the circulating-air ventilator or of the exhaust-air ventilator. By controlling the speed of the circulating air fan and / or the exhaust fan can thus depending on which temperature is desired in the Einbrennzone, the performance of the circulating air and / or the exhaust fan to be adjusted such that with respect to the changed air density due to the changed temperature in the stoving zone optimal conditions for baking the lacquer layer on the wire continue to exist.

Erfindungsgemäß ist demanch dem Sollwert der Temperatur in der Einbrennzone ein Drehzahlwert des Umluft-Ventilators bzw. des Abluft-Ventilators zugeordnet, so dass sich eine einfache Steuerung ergibt, bei welcher ein direkter Zusammenhang zwischen dem Temperatur-Sollwert und den Drehzahlwerten des Umluft- und/oder des Abluft-Ventilators gegeben ist.In accordance with the invention, a rotational speed value of the circulating-air ventilator or exhaust fan is assigned to the nominal value of the temperature in the stoving zone, so that a simple control results, in which a direct relationship between the temperature setpoint and the rotational speed values of the circulating air and / or or given the exhaust fan.

Eine besonders einfache Zuordnung der Temperatur-Sollwerte sowie der Drehzahlwerte des Umluft- und/oder des Abluft-Ventilators ist gegeben, wenn die einander zugeordneten Sollwerte der Temperatur und die Drehzahlwerte des Umluft-Ventilators bzw. des Abluft-Ventilators auf einem Datenträger gespeichert sind.A particularly simple assignment of the temperature setpoints and the rotational speed values of the circulating air and / or the exhaust air fan is given if the mutually associated desired values of the temperature and the rotational speed values of the circulating air fan or the exhaust fan are stored on a data carrier.

Zum Einbrennen einer Lackschicht auf einem Draht ist es üblicherweise vorteilhaft, wenn der Sollwert der Temperatur zwischen 20°C und 1000°C, insbesondere zwischen 50°C und 800°C, beträgt.For baking a lacquer layer on a wire, it is usually advantageous if the desired value of the temperature between 20 ° C and 1000 ° C, in particular between 50 ° C and 800 ° C, is.

Tests haben gezeigt, dass es bei den üblicherweise verwendeten Ventilatoren zur Erzielung von möglichst optimalen Strömungsbedingungen in der Einbrennzone bei den üblichen Temperatur-Sollwerten in der Einbrennzone günstig ist, wenn die Drehzahl des Umluft-Ventilators zwischen 2700 U/min und 5000 U/min, insbesondere zwischen 3100 U/min und 4600 U/min, beträgt. Ebenso hat sich als vorteilhaft herausgestellt, wenn die Drehzahl des Abluft-Ventilators zwischen 1000 U/min und 5000 U/min, insbesondere zwischen 1500 U/min und 4500 U/min, beträgt.Tests have shown that it is favorable for the fans commonly used to achieve the best possible flow conditions in the Einbrennzone at the usual temperature setpoints in the Einbrennzone when the speed of the circulating air fan between 2700 U / min and 5000 U / min, in particular between 3100 U / min and 4600 U / min. It has also been found to be advantageous if the speed of the exhaust fan between 1000 U / min and 5000 U / min, in particular between 1500 U / min and 4500 U / min, is.

Um über den Umluftstrom die zum Verdampfen der im flüssigen Lack enthaltenen Lösungsmittel erforderliche Wärmeenergie zuzuführen ist es vorteilhaft, wenn dem Umluftstrom eine Heizeinrichtung zugeordnet ist.In order to supply the thermal energy required for evaporating the solvents contained in the liquid paint via the circulating air stream, it is advantageous if the circulating air stream is assigned a heating device.

Ebenso kann die erfindungsgemäße Aufgabe mit einem Verfahren der eingangs angeführten Art gelöst werden, wobei durch den Draht-Durchzugskanal ein Umluftstrom geleitet wird, der im Kreis geführt wird, wobei Abluftstrom aus dem Umluftstrom abgesaugt wird, so dass an einem Einlauf und einem Auslauf des Durchzugskanals Frischluft in den Durchzugskanals nachströmt, und der Druck des Umluftstroms bzw. der Saugdruck des Abluftstroms in Abhängigkeit von einem einstellbaren Sollwert der Temperatur in der Einbrennzone gesteuert wird, wobei dem Sollwert der Temperatur in der Einbrennzone ein Drehzahlwert des Umluft-Ventilators bzw. des Abluft-Ventilators zugeordnet wird.. Durch die Änderung des Drucks des Umluftstroms bzw. des Saugdrucks des Abluftstroms kann somit die geänderte Luftdichte bei einer veränderten Temperatur in der Einbrennzone berücksichtigt werden, so dass bei unterschiedlichen Temperaturen in der Einbrennzone jeweils optimale Bedingungen vorliegen.Likewise, the object of the invention can be achieved with a method of the initially mentioned type, wherein a circulating air flow is passed through the wire passage channel, which is circulated, wherein exhaust air is sucked from the circulating air flow, so that at an inlet and an outlet of the passage channel Fresh air in the passage channels nachströmt, and the pressure of the recirculating air flow or the suction pressure of the exhaust air flow is controlled in response to an adjustable setpoint of the temperature in the Einbrennzone, wherein the target value of the temperature in the Einbrennzone a speed value of the recirculation fan or the exhaust air By changing the pressure of the recirculating air flow or the suction pressure of the exhaust air flow can thus change the air density at a changed Temperature in the baking zone are taken into account, so that there are optimal conditions at different temperatures in the baking zone.

Hinsichtlich einer effizienten Übertragung der Wärmeenergie von dem Umluftstrom auf den Draht ist es vorteilhaft, wenn der Umluftstrom entgegen der Durchzugsrichtung des Drahtes durch den Durchzugskanal geleitet wird.With regard to an efficient transmission of the heat energy from the circulating air flow to the wire, it is advantageous if the circulating air flow is directed counter to the direction of passage of the wire through the passage channel.

Um den lackierten Draht die für ein Verdampfen des im flüssigen Lack enthaltenen Lösungsmittels erforderliche Wärmeenergie zuzuführen ist es vorteilhaft, wenn der Umluftstrom erwärmt wird.In order to supply the painted wire with the heat energy required for evaporation of the solvent contained in the liquid paint, it is advantageous if the circulating air stream is heated.

Die Erfindung wird nachstehend anhand von einem in der Zeichnung dargestellten bevorzugten Ausführungsbeispiel, auf das sie jedoch nicht beschränkt sein soll, noch näher erläutert. Im Einzelnen zeigen in der Zeichnung: Fig. 1 eine teilweise geschnittene Ansicht eines Lackeinbrennofens mit einem durch einen Durchzugskanal geführten Draht.The invention will be explained in more detail with reference to a preferred embodiment shown in the drawing, to which, however, it should not be limited. In detail, in the drawing: Fig. 1 a partially sectioned view of a Lackeinbrennofens with a guided through a passage channel wire.

In der einzigen Zeichnungsfigur ist ein Lackeinbrennofen 1 ersichtlich, der einen Durchzugskanal 2 aufweist, durch welchen ein Draht 3 in Durchzugsrichtung 4 geführt wird. Der Draht 3 tritt hierbei bei einem Einlauf 5 in den Durchzugskanal 2 ein und verlässt den Durchzugskanal 2 bei einem Auslauf 6. Im Bereich des Einlaufs und Auslaufs kann somit, wie mit Pfeilen 5', 6' skizziert, Frischluft in den Durchzugskanal 2 eintreten, so dass im Bereich einer Einbrennzone 8 des Durchzugskanals 2 optimale Bedingungen zum Einbrennen des Lacks auf dem Draht 3 vorliegen.In the single drawing figure, a paint baking oven 1 can be seen, which has a passage channel 2, through which a wire 3 is guided in the direction of passage 4. The wire 3 enters this case at an inlet 5 in the passage channel 2 and leaves the passage channel 2 at an outlet 6. In the region of the inlet and outlet can thus, as outlined with arrows 5 ', 6', fresh air enter the passage channel 2, so that optimal conditions for baking the paint on the wire 3 are present in the region of a burn-in zone 8 of the passage channel 2.

Um ein Verdampfen des im Bereich des Einlaufs 5 noch in seiner flüssigen Form auf dem Draht 3 vorgesehenen Lacks zu erzielen, so dass die verbleibenden Festkörper eine isolierende Umhüllung des Drahtes 3 bilden, wird entgegen der Durchzugsrichtung 4 des Drahtes 3 in Pfeilrichtung 7 ein erwärmter Umluftstrom durch den Durchzugskanal 2 geführt. Der Umluftstrom 7 wird hierbei in einem im Wesentlichen geschlossenen Luftführsystem 9 im Kreis geführt, so dass sich ein Umluftkreis ergibt. Im Luftführsystem 9 ist eine Heizvorrichtung 10 aufgenommen, so dass dem Umluftstrom 7 die für das Verdampfen des Lösungsmittels des Lacks erforderliche Wärmeenergie zugeführt wird. Um den Umluftstrom in Pfeilrichtung 7 durch das Luftführsystem 9 zu bewegen, ist ein Umluft-Ventilator 11 vorgesehen.In order to achieve evaporation of the intended in the inlet 5 in its liquid form on the wire 3 lacquer, so that the remaining solid form an insulating sheath of the wire 3, is opposite to the direction of passage 4 of the wire 3 in the direction of arrow 7, a heated circulating air flow passed through the passage channel 2. The recirculating air stream 7 is hereby circulated in a substantially closed air guiding system 9, so that a circulating air circuit results. In the air guiding system 9, a heating device 10 is accommodated, so that the circulating air flow 7 is supplied with the heat energy required for the evaporation of the solvent of the paint. In order to move the circulating air flow in the direction of arrow 7 through the air guiding system 9, a circulating air fan 11 is provided.

An das Luftleitsystem 9 ist zudem eine Abluftleitung 12 angeschlossen, über welche mit Hilfe eines Abluft-Ventilators 13 ein Teilstrom, nämlich der Abluftstrom, in Pfeilrichtung 14 aus dem Umluftkreis abgeleitet wird. Mit Hilfe des Abluft-Ventilators 13 wird eine solche Menge an Abluft abgesaugt, so dass am Einlauf 5 bzw. am Auslauf 6 die für ein effizientes Einbrennen des Lacks zweckmäßige Frischluft 5', 6' in den Durchzugskanal 2 nachströmt.To the air control system 9 also an exhaust duct 12 is connected, via which with the aid of an exhaust fan 13, a partial flow, namely the exhaust air flow, is derived in the direction of arrow 14 from the circulating air. With the aid of the exhaust fan 13, such an amount of exhaust air is sucked off, so that at the inlet 5 and at the outlet 6, the fresh air 5 ', 6' suitable for efficient stoving of the paint flows into the through-channel 2.

Um die für unterschiedliche Temperaturen im Bereich der Einbrennzone 8 des Durchzugskanals 2 jeweils optimale Luftströmung zu erzielen, sind der Umluft-Ventilator 11 sowie der Abluft-Ventilator 13 über eine Drehzahl-Steuerung 15 gesteuert, wobei über die Drehzahl-Steuerung 15 die jeweiligen Drehzahlwerte der Ventilatoren 11 und 13 in Abhängigkeit des gewünschten Sollwertes der Temperatur im Bereich der Einbrennzone 8 festgelegt sind.In order to achieve optimum air flow for different temperatures in the region of the burn-in zone 8 of the draft channel 2, the circulating air fan 11 and the exhaust fan 13 are controlled by a speed control 15, via the speed control 15, the respective speed values of Fans 11 and 13 depending on the desired setpoint the temperature in the region of the baking zone 8 are fixed.

Hierzu weist die Drehzahl-Steuerung 15 eine auf einem Datenträger gespeicherte Tabelle (s. unten) auf, so dass dem gewünschten Temperatur-Sollwert jeweils eine bestimmte Drehzahl des Umluft-Ventilators 11 und des Abluft-Ventilators 13 zugeordnet sind. Automatische Lufteinstellung T [°C] Umluft-Ventilator [U/min] Abluft-Ventilator [U/min] 50 3100 1500 100 3200 1700 150 3300 1900 200 3400 2100 250 3500 2300 300 3600 2500 350 3700 2700 400 3800 2900 450 3900 3100 500 4000 3300 550 4100 3500 600 4200 3700 650 4300 3900 700 4400 4100 750 4500 4300 800 4600 4500 For this purpose, the speed control 15 has a table (see below) stored on a data carrier, so that a specific speed of the circulating air fan 11 and the exhaust fan 13 are assigned to the desired temperature setpoint. Automatic air adjustment T [° C] Recirculation fan [rpm] Exhaust fan [rpm] 50 3100 1500 100 3200 1700 150 3300 1900 200 3400 2100 250 3500 2300 300 3600 2500 350 3700 2700 400 3800 2900 450 3900 3100 500 4000 3300 550 4100 3500 600 4200 3700 650 4300 3900 700 4400 4100 750 4500 4300 800 4600 4500

Hierdurch ist zuverlässig gewährleistet, dass trotz der unterschiedlichen Luftdichte des Umluftstroms bei veränderter Temperatur in der Einbrennzone 8 jeweils optimale Bedingungen zum Einbrennen des Lacks auf dem Draht 3 vorliegen, wobei lediglich die gewünschte Temperatur eingestellt werden muss und über die Drehzahl-Steuerung 15 sodann automatisch, ohne dass hierfür Bedienpersonal spezielle Einstellungen vornehmen muss, die optimale Drehzahl des Umluft-Ventilators 11 bzw. Abluft-Ventilators 13 eingestellt wird.This reliably ensures that, despite the different air density of the circulating air flow with changing temperature in the Einbrennzone 8 optimal conditions for baking the paint on the wire 3 are present, with only the desired temperature must be adjusted and then automatically via the speed control 15, without requiring operating personnel to make special settings, the optimum Speed of the circulating air fan 11 and exhaust fan 13 is set.

Claims (9)

  1. Device for stoving a coating layer on a wire (3) comprising a passageway (2), having a stoving zone (8), for the wire (3), a circulating air fan (11) for generating a circulating air flow (7) that is conducted through the passageway (2) and circulated by means of an air guide system (9) and an exhaust air fan (13) for discharging an exhaust air flow (14) from the circulating air flow (7) being provided such that fresh air (5', 6') flows in at the inlet (5) and at the outlet (6) of the passageway (2) in order to stove the coating,
    characterised in that a speed controller (15) of the circulating air fan (11) or of the exhaust air fan (13) is provided depending on an adjustable setpoint of the temperature in the stoving zone (8), the setpoint of the temperature in the stoving zone (8) being associated with a speed value of the circulating air fan (11) or of the exhaust air fan (13).
  2. Device according to claim 1, characterised in that
    the mutually associated setpoints of the temperature and the speed values of the circulating air fan (11) or of the exhaust air fan (13) are stored on a data medium.
  3. Device according to either claim 1 or claim 2, characterised in that
    the setpoint of the temperature is between 20°C and 1000°C, in particular between 50°C and 800°C.
  4. Device according to any of claims 1 to 3, characterised in that
    the speed of the circulating air fan (11) is between 2700 rpm and 5000 rpm, in particular between 3100 rpm and 4600 rpm.
  5. Device according to any of claims 1 to 4, characterised in that
    the speed of the exhaust air fan (13) is between 1000 rpm and 5000 rpm, in particular between 1500 rpm and 4500 rpm.
  6. Device according to any of claims 1 to 5, characterised in that
    a heating means (10) is associated with the circulating air flow (7).
  7. Method for controlling the temperature in a stoving zone (8) of a wire passageway (2) of a coating stoving oven (1),
    in which a circulating air flow (7) is directed through the wire passageway (2) by means of a circulating air fan (11) and circulated, exhaust air flow (14) being sucked from the circulating air flow (7) by means of an exhaust air fan (13) such that fresh air (5', 6') flows into the passageway at an inlet (5) and an outlet (6) of the passageway (2),
    characterised in that the pressure of the recirculating airflow (7) or the suction pressure of the exhaust air flow (14) is controlled depending on an adjustable setpoint of the temperature in the stoving zone (8),
    a speed value of the circulating air fan (11) or of the exhaust air fan (13) being assigned to the setpoint of the temperature in the stoving zone (8).
  8. Method according to claim 7, characterised in that
    the circulating air flow (7) is directed against the direction of passage (4) of the wire through the passageway (2).
  9. Method according to either claim 7 or claim 8, characterised in that
    the circulating air flow (7) is heated.
EP07718394.5A 2006-04-24 2007-04-17 Device for stoving an enamel layer and method for controlling the temperature Active EP2010849B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0033306U AT9379U1 (en) 2006-04-24 2006-04-24 DEVICE FOR BURNING A PAINT LAYER AND METHOD FOR CONTROLLING THE TEMPERATURE
PCT/AT2007/000178 WO2007121499A1 (en) 2006-04-24 2007-04-17 Device for stoving an enamel layer and method for controlling the temperature

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EP2010849A1 EP2010849A1 (en) 2009-01-07
EP2010849B1 true EP2010849B1 (en) 2019-10-23

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Publication number Priority date Publication date Assignee Title
CN102538419B (en) * 2012-02-20 2014-09-10 张家港市东航机械有限公司 Heating and drying furnace for continuous steel wire production
CN102967137A (en) * 2012-12-12 2013-03-13 河南恒星科技股份有限公司 Drying box provided with exhaust fan

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Publication number Priority date Publication date Assignee Title
US4087568A (en) 1977-07-01 1978-05-02 Formica Corporation Method and apparatus for controlling a material treater at maximum throughput with air velocity control
DE3245583A1 (en) 1982-12-09 1984-06-14 Babcock Textilmaschinen GmbH, 2105 Seevetal Method for saving energy in heat-treatment processes
ATE36657T1 (en) 1984-05-30 1988-09-15 Mag Masch App METHOD FOR CONTROLLING THE BURNING TEMPERATURE OF A BURNING FURNACE FOR THE MANUFACTURE OF ENAMELLED WIRE AND A SUITABLE BURNING FURNACE FOR THESE.
IT210434Z2 (en) 1987-01-30 1988-12-30 S I C M E S P C Societa Ind Co OVEN FOR THE COOKING OF FILIFFORM Artifacts
DE8717519U1 (en) 1987-05-19 1989-02-23 Lackdraht Union GmbH, 2838 Sulingen Device for drying an elongated material moving in the longitudinal direction, e.g. a lacquered wire
FI81628C (en) 1987-11-09 1990-11-12 Valmet Paper Machinery Inc FOERFARANDE VID STYRNINGEN OCH / ELLER KONTROLLEN AV EN TORKNINGSPROCESS SOM SKER MED EN YANKEE-CYLINDER.
DE4010306C2 (en) 1990-03-30 1999-06-10 Mag Masch App Process and device for the production of enamelled wires with melting resins
AT2342U1 (en) 1996-10-30 1998-08-25 Muehlboeck Kurt METHOD AND DEVICE FOR DRYING STACKED WOOD

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EP2010849A1 (en) 2009-01-07
AT9379U1 (en) 2007-09-15

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