EP0162941A1 - Procédé de régulation de la température de cuisson de four de cuisson pour la production de fils laqués ainsi qu'un four à cet effet - Google Patents

Procédé de régulation de la température de cuisson de four de cuisson pour la production de fils laqués ainsi qu'un four à cet effet Download PDF

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Publication number
EP0162941A1
EP0162941A1 EP84106241A EP84106241A EP0162941A1 EP 0162941 A1 EP0162941 A1 EP 0162941A1 EP 84106241 A EP84106241 A EP 84106241A EP 84106241 A EP84106241 A EP 84106241A EP 0162941 A1 EP0162941 A1 EP 0162941A1
Authority
EP
European Patent Office
Prior art keywords
stoving
retort
wire
circulation
partial flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84106241A
Other languages
German (de)
English (en)
Other versions
EP0162941B1 (fr
Inventor
Hans-Peter Pichler
Herbert Berthold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MAG Maschinen und Apparatebau GmbH
Original Assignee
MAG Maschinen und Apparatebau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MAG Maschinen und Apparatebau GmbH filed Critical MAG Maschinen und Apparatebau GmbH
Priority to DE8484106241T priority Critical patent/DE3473570D1/de
Priority to AT84106241T priority patent/ATE36657T1/de
Priority to EP84106241A priority patent/EP0162941B1/fr
Priority to JP60113957A priority patent/JPS60256786A/ja
Priority to ES543636A priority patent/ES8608059A1/es
Publication of EP0162941A1 publication Critical patent/EP0162941A1/fr
Application granted granted Critical
Publication of EP0162941B1 publication Critical patent/EP0162941B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • 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
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/15—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length not supported on conveying means
    • 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

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a baking oven according to the preamble of claim 7.
  • the wire previously annealed in a stress-relieving heat passes through a lacquer application device and finally through a drying and baking zone in a baking retort, in which hot air flows in countercurrent to the wire feed is circulated.
  • the solvent vapors and fission products generated when the paint is baked on are removed from the drying zone by recirculation via a return shaft.
  • the vapors drawn from the stoving retort, including the fresh air drawn in through them pass through a mixing zone, a heating system and a catalyst and are heated by the heating system and the catalyst which burns the solvent vapors. If there is a sufficient amount of solvent heat, the known system can be operated in a self-sustaining manner after the heating process, that is to say without the supply of external energy.
  • enameled wire has to be based on high standards by certain quality standards, the manufacturer of L ackdraht increasingly on a standard of quality work, the partially beyond the requirements stipulated by the standards.
  • maintaining constant process conditions in the stoving furnace with regard to supply and exhaust air quantities, temperature, air and wire speed is an essential requirement.
  • the temperature of the catalytic converter rises due to the combustion of solvent vapors of, for example, 120 o K
  • the temperature rise would decrease by a sixth to 100 o K as a result of the fault.
  • this would lead to a drop in temperature of the hot air after the catalyst of 20 oK .
  • the same problem also occurs when wires have to be stopped, for example when the wire cross-section has to be changed. On the other hand, when new wires are started up, the temperature increases considerably.
  • the temperature drop that occurs during wire standstills, or the temperature rise that occurs after the catalytic converter during the operation of the wire, is said to be the constant temperature in influence the retort as little as possible.
  • the control required for this takes place via the heating system.
  • this regulation is sluggish, so that there are still fluctuating stoving conditions and thus fluctuating enamelled wire quality.
  • the fresh air supply at the wire inlet or at the wire outlet of the stoving retort could be reduced or increased, which would be a less sluggish control than, for example, using an electrical heating device, but this leads to a change in the longitudinal temperature profile and a reduction in the drying and Burning zone available hot air, which in turn leads to fluctuations in the magnet wire quality.
  • the object of the invention is to ensure, by simple measures, that the process conditions are kept as constant as possible even if, as a result of disruptions in the wire feed, for example wire breakage, or shutdown or start-up of individual wire pulls when changing the wire size, the temperature of the circulating hot air is forced and so that the baking temperature changes.
  • the partial air stream branched off behind the catalytic converter can be introduced into the return duct immediately before the catalytic converter. Since experience has shown that some of the solvent vapors are burned as soon as they pass through the electrical heating device, it is also advisable to enter the branched-off partial air flow before the glow in the return duct of the stoving retort. However, it is particularly advantageous to introduce the branched-off partial air flow into the return shaft before the mixing zone, because this is to achieve an optimal uniformity of air temperature and air speed in the return shaft.
  • a further equalization of the stoving conditions can be achieved in that the circulation of the partial air flow is also used to regulate the temperature in the drying and stoving zone in the stoving retort.
  • the temperature can be reduced even when the number of burns through the baking oven changes keep the wires passed almost constant by reducing the amount of air circulated, for example in the event of wire breaks, in order to compensate for the reduction in the amount of solvent and thus the reduced temperature rise on the catalyst. If, on the other hand, the number of wire draws is increased, a constant temperature is guaranteed by a corresponding increase in the circulated partial air flow.
  • the circulating partial air flow is expediently regulated by changing the speed of the circulating air blower provided in the circulating line.
  • the control can expediently also be carried out by a flap or a slide provided in the circulation line.
  • the control can be carried out depending on the temperature determined by a temperature sensor in the drying or stoving zone or depending on the temperature determined by a temperature sensor in the drying or stoving zone or depending on the amount of solvent by a solvent measuring device, such as a flame ionization detector , respectively.
  • a solvent measuring device such as a flame ionization detector
  • the overall system shown schematically in FIG. 1 is used for the production of enamelled wire, preferably several wires, and essentially comprises a wire outlet 1 with bare wire coils 2, from which the wire is drawn off by a subsequent wire pulling device 3.
  • the wire With the interposition of deflection rollers, the wire finally runs into a glow 19 of the lacquer kiln, generally designated by the reference number 5, is deflected at the end thereof and arrives at a lacquer application device 6 arranged at the front end of the lacquer kiln 5, from where the wire or the parallel wire trains are fed a burn-in retort designated 7.
  • the wires pass through a wire cooling device designated 8.
  • the wires pass through the work stations 6, 7 and 8 several times, that is to say the coating application device, baking retort and wire cooling device, until they are finally wound onto spools on a coating wire winding device 9.
  • the stoving retort 7 is subdivided into a drying chamber 10 and a curing or stoving chamber 11, in which the lacquer applied to the wire by the upstream lacquer application device 6 and dried in the drying chamber 10 is stoved. Furthermore, the burn-in retort 7 is assigned a return shaft, designated 12, at the left end of which a circulating air blower 13 is provided, by means of which the air is circulated in the single-circuit counterflow principle in the direction of the arrow 14, specifically in the drying chamber 10 and in the baking chamber 11 in counterflow to that in the direction of the arrow 15 transported wire.
  • the circulating air blower 13 sucks in solvent vapors and fission products of the lacquer applied to the wire and fresh air in the drying chamber 10 via the wire inlet 16, the mixing of the gases taking place in a mixing zone 17 downstream of the circulating air blower 13.
  • Arranged in the return shaft 12 are the glow 19, by means of which the wires passed through glow tubes of the glow 19 are annealed, as well as the mixing zone 6, the heating system 4 and a catalyst 18, in which the solvent vapors and fission products of the lacquer are burned.
  • the air circulated in the return shaft 12 is heated both when passing through the heating system and when passing through the catalyst 18, and the hot air is then introduced into the baking chamber 11 of the baking retort 7 via a perforated plate bushing 20 of a known type.
  • the air flow and the fresh air sucked in through the wire inlet 16 can be regulated by a flap in front of the circulating air blower 13.
  • Some of the exhaust gases circulated in the return shaft 12 are discharged into the open via an exhaust pipe 22 coaxially arranged with the glow 19 and an exhaust pipe 23 with a further catalyst 24 located therein.
  • the fan indicated at 25 indicates that this is a forced discharge, which may be regulated by a flap 26 arranged in the exhaust pipe 23.
  • the wire cooler 30 To the right of the exhaust pipe is a wire cooler 30, from which the wire is guided to the lacquer application device 6.
  • the wire cooling device 8 which has a pressure blower 31 and a suction blower 32, adjoins the perforated plate bushing 20, Via which a differential pressure can be set in the wire cooler 8, such that an overpressure is generated in the area of the wire outlet 33, so that fresh air can enter the burn-in chamber 11 through the wire outlet without harmful substances getting into the free atmosphere.
  • the wires running through the annealing line 19 reach the lacquer application device 6 and pass through the stoving retort 7, where the lacquer applied is stoved and the resulting solvent vapors are drawn off into the return duct 12 by means of the circulating air blower 13.
  • the wire then enters the wire cooler 8 and, depending on the coating application required, is repeatedly returned to the coating application device 6 until it is finally discharged to the coating wire winding device 9. If the amount of solvent is large enough, self-sustaining operation without the supply of external energy can be ensured after the heating process has ended due to the hot air generated in the return shaft 12, because the heat of solvent is used with the aid of the catalyst 18 to operate the drying and stoving process.
  • fresh air is drawn in via the wire inlet 16 and the wire outlet 33, which at the same time essentially prevents the escape of toxic unburned solvent vapors into the environment.
  • a separate circulation line 35 is assigned, through which a partial flow of the hot air circulated in the return shaft 12 is branched off behind the catalytic converter 8 and fed back into the return shaft 12 upstream of the catalytic converter.
  • a circulating air blower 36 is arranged in the circulation line 35. Due to the branched-off and re-introduced hot air, the amount of hot air flowing through the catalyst 18 is increased, which, with the amount of solvent remaining unchanged and thus constant solvent energy in the process, brings about a reduction in the temperature difference between the hot air before and after the catalyst 18.
  • the branched partial flow is fed into the return shaft 12 immediately upstream of the catalytic converter 18.
  • the branched partial flow of the hot air is supplied before the heating system 4, whereas the modification according to FIG 5 the branched-off partial stream is introduced into the return shaft 12 upstream of the mixing zone 17.
  • the embodiment according to FIG. 4, i.e. introduction of the partial flow upstream of the heating system 4 takes into account the fact that part of the solvent vapors is already burned when it passes through the heating system, so that it is then expedient to circulate the circulating air upstream of the heating system into the return duct 12 of the branding retort.
  • the embodiment according to FIG. 5 is particularly expedient for introducing the partial flow upstream of the mixing zone, as a result of which the best equalization of air temperature and air speed in the return shaft 12 is achieved.
  • a flap 37 is arranged in the circulation line 35, a slider being alternatively provided for this purpose.
  • This allows the air circulation to be regulated and thus also the temperature in the drying and stoving zone of the inlet Brennretorte 7.
  • the amount of circulated air can also be accomplished by changing the speed of the recirculation fan 36. In both cases, regulation takes place either as a function of the temperature recorded by a temperature sensor (not shown) in the drying or stoving zone or by means of a solvent device, such as a flame ionization detector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Tunnel Furnaces (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
EP84106241A 1984-05-30 1984-05-30 Procédé de régulation de la température de cuisson de four de cuisson pour la production de fils laqués ainsi qu'un four à cet effet Expired EP0162941B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8484106241T DE3473570D1 (en) 1984-05-30 1984-05-30 Process for monitoring the burning temperature of a firing kiln in the laquered -thread production, and kiln therefor
AT84106241T ATE36657T1 (de) 1984-05-30 1984-05-30 Verfahren zur steuerung der einbrenntemperatur eines einbrennofens fuer lackdrahtherstellung sowie hierfuer geeigneter einbrennofen.
EP84106241A EP0162941B1 (fr) 1984-05-30 1984-05-30 Procédé de régulation de la température de cuisson de four de cuisson pour la production de fils laqués ainsi qu'un four à cet effet
JP60113957A JPS60256786A (ja) 1984-05-30 1985-05-27 エナメル線製造用焼付炉およびその焼付温度制御方法
ES543636A ES8608059A1 (es) 1984-05-30 1985-05-29 Procedimiento para el control de la temperatura de secado deun horno de secado para la fabricacion de hilo esmaltado

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84106241A EP0162941B1 (fr) 1984-05-30 1984-05-30 Procédé de régulation de la température de cuisson de four de cuisson pour la production de fils laqués ainsi qu'un four à cet effet

Publications (2)

Publication Number Publication Date
EP0162941A1 true EP0162941A1 (fr) 1985-12-04
EP0162941B1 EP0162941B1 (fr) 1988-08-24

Family

ID=8191960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106241A Expired EP0162941B1 (fr) 1984-05-30 1984-05-30 Procédé de régulation de la température de cuisson de four de cuisson pour la production de fils laqués ainsi qu'un four à cet effet

Country Status (5)

Country Link
EP (1) EP0162941B1 (fr)
JP (1) JPS60256786A (fr)
AT (1) ATE36657T1 (fr)
DE (1) DE3473570D1 (fr)
ES (1) ES8608059A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3717166A1 (de) * 1987-05-19 1988-12-01 Lackdraht Union Gmbh Verfahren zur trocknung eines in laengsrichtung bewegten, langgestreckten gutes, z. b. eines lackdrahtes, und anordnung zur durchfuehrung des verfahrens
EP0326228A1 (fr) * 1988-01-29 1989-08-02 Stork Contiweb B.V. Dispositif de chauffage
GB2198825B (en) * 1986-12-17 1990-08-15 Meltech Eng A furnace for use in heat treating elongate elements
WO2007121499A1 (fr) 2006-04-24 2007-11-01 Nhkm Consulting Gmbh Dispositif de cuisson d'une couche d'émail et procédé permettant la régulation de la chaleur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102394155A (zh) * 2011-10-17 2012-03-28 宁德市三富机电有限公司 一种立式漆包机烘烤装置
CN102376401B (zh) * 2011-11-25 2013-03-20 无锡市梅达电工机械有限公司 中速立式漆包线机的热风循环烘烤装置
CN106369974A (zh) * 2016-08-25 2017-02-01 铜陵华洋特种线材有限责任公司 线材干燥器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265033A (en) * 1960-10-13 1966-08-09 Thomson Houston Comp Francaise Wire enamelling furnaces
DE2019410A1 (de) * 1969-04-30 1970-11-12 M A G Maschinen Und Appbau Gmb Einbrenn-Ofen fuer Anlagen zur Lackdraht-Herstellung
DE1604758A1 (de) * 1964-04-21 1971-02-18 Aumann Kg Willy Einrichtung zum Trocknen von Schutzschichten auf metallischen oder nichtmetallischen Straengen beliebigen Querschnitts
DE3118830A1 (de) * 1981-05-12 1982-12-09 MAG Maschinen und Apparatebau GmbH, 8055 Graz "anlage zur lackdrahtherstellung im inlineverfahren"

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265033A (en) * 1960-10-13 1966-08-09 Thomson Houston Comp Francaise Wire enamelling furnaces
DE1604758A1 (de) * 1964-04-21 1971-02-18 Aumann Kg Willy Einrichtung zum Trocknen von Schutzschichten auf metallischen oder nichtmetallischen Straengen beliebigen Querschnitts
DE2019410A1 (de) * 1969-04-30 1970-11-12 M A G Maschinen Und Appbau Gmb Einbrenn-Ofen fuer Anlagen zur Lackdraht-Herstellung
DE3118830A1 (de) * 1981-05-12 1982-12-09 MAG Maschinen und Apparatebau GmbH, 8055 Graz "anlage zur lackdrahtherstellung im inlineverfahren"

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198825B (en) * 1986-12-17 1990-08-15 Meltech Eng A furnace for use in heat treating elongate elements
DE3717166A1 (de) * 1987-05-19 1988-12-01 Lackdraht Union Gmbh Verfahren zur trocknung eines in laengsrichtung bewegten, langgestreckten gutes, z. b. eines lackdrahtes, und anordnung zur durchfuehrung des verfahrens
EP0326228A1 (fr) * 1988-01-29 1989-08-02 Stork Contiweb B.V. Dispositif de chauffage
WO2007121499A1 (fr) 2006-04-24 2007-11-01 Nhkm Consulting Gmbh Dispositif de cuisson d'une couche d'émail et procédé permettant la régulation de la chaleur

Also Published As

Publication number Publication date
DE3473570D1 (en) 1988-09-29
ES543636A0 (es) 1986-06-01
JPS60256786A (ja) 1985-12-18
ATE36657T1 (de) 1988-09-15
ES8608059A1 (es) 1986-06-01
JPH0523358B2 (fr) 1993-04-02
EP0162941B1 (fr) 1988-08-24

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