EP0728848A2 - Base for bell type furnaces - Google Patents

Base for bell type furnaces Download PDF

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Publication number
EP0728848A2
EP0728848A2 EP96890024A EP96890024A EP0728848A2 EP 0728848 A2 EP0728848 A2 EP 0728848A2 EP 96890024 A EP96890024 A EP 96890024A EP 96890024 A EP96890024 A EP 96890024A EP 0728848 A2 EP0728848 A2 EP 0728848A2
Authority
EP
European Patent Office
Prior art keywords
sheet metal
frame part
base
support structure
filling part
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
EP96890024A
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German (de)
French (fr)
Other versions
EP0728848A3 (en
EP0728848B1 (en
Inventor
Peter Helmut Dipl.-Ing. Ebner
Heribert Dipl.-Ing. Lochner
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Individual
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Individual
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Publication of EP0728848A2 publication Critical patent/EP0728848A2/en
Publication of EP0728848A3 publication Critical patent/EP0728848A3/en
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Publication of EP0728848B1 publication Critical patent/EP0728848B1/en
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Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces

Definitions

  • the invention relates to an annealing base for bell-type annealing furnaces with a support which receives the annealed material, in particular stacked sheet metal bundles, rests on the guide device of a central fan, a heat insulating filler part arranged underneath it and surrounding the fan axis and with a load on the guide device through the filler part onto one the foundation lying frame part transmitting support structure, the filling part of gas-tight encapsulated insulating wool or the like.
  • a protective hood reaching up to the frame part is placed over the annealing material and the base and contains a protective gas then circulated by the fan, mainly to avoid oxidation on the surface of the annealing material.
  • the protective hood is then covered by a heating hood, the heating device of which, as a rule gas or oil burner or electric heating elements, heats the protective hood on the outside, which then in turn heats the protective gas and subsequently the material to be annealed.
  • the heating hood is replaced by a cooling hood and the batch is cooled.
  • the supporting structure of the annealing base used to transfer the weight of the annealing material to the foundation has so far mostly consisted of individual, mostly tubular supports welded to the cladding sheet, which have support elements in the upper area which have the length changes between the upper cladding sheet and the lower one that occur during heating or cooling Catch the frame part by sliding friction or bending stress of the supports, whereby relatively large dilations or contractions occur, since the temperature difference between the guide device and the frame part is several hundred degrees. If the construction or processing is improper, cracks may occur in the sheet metal capsule after a short period of operation, so that undesired mixing of the protective gas with the gas which is in any case present in the filler, namely air or nitrogen, occurs. Such errors are mainly caused by the fact that a relative movement on the sliding surfaces is impaired and lateral forces occur in the supports, which can give rise to welding cracks.
  • the invention is therefore based on the object to remedy this deficiency and to provide a glow socket of the type described, in which no cracks occur in the capsule forming the filling part.
  • the invention solves this problem in that in the sheet metal forming the capsule of the filling part, directly underneath the diffuser, a lower surface adapted to the sheet thickness, which substantially exceeds the sheet thickness, is embedded, which forms the supporting structure by means of two concentric sheet metal cylinders connecting it to the frame part.
  • the two concentric sheet metal cylinders mostly with the are welded firmly on the glow chamber side, the same temperature as this is applied from above, all parts therefore dilate uniformly, so that there can be no length differences or sliding movements between the individual parts.
  • the two sheet metal cylinders and the form ring are increased in diameter when heated by the expansion coefficients corresponding to the materials in question and then shrink again during cooling without the risk of welding cracks or the like. bring about. Since the insulating wool or the like contained in the filling part. is elastic, there is no opening between the metal parts and the insulation material during these processes, which enables heat to be transported from above into the lower plinth area to the foundation through natural gas flows.
  • the lower edge of the sheet metal cylinder has cutouts and is only welded to the frame part between these cutouts.
  • Fig. 1 shows a glow socket in vertical section
  • Fig. 2 shows a part of a sheet metal cylinder in the diagram.
  • a frame part 2 On the foundation 1 is a frame part 2, which in turn carries filler parts 3.
  • the guide device 4 of a central fan 5 rests on the filler parts 3, the guide device 4 in turn carrying a support 6 for the annealing material, usually bundles of sheets.
  • a glow hood 7 is placed over the entire glow socket.
  • the guide device 4 In order to transfer the load of the annealing material from the support 6 to the foundation 1, the guide device 4 is used first.
  • the filling part 3 which consists of a gas-tight sheet metal capsule and is filled with insulating wool 8, a support structure is arranged for the load transfer to the frame part 2.
  • This support structure consists of one of the lower surface of the diffuser 4, in the sheet metal of the filling part 3, relatively strong molded ring 9, which is connected by two concentric sheet metal cylinders 10 to the frame part 2, these sheet metal cylinders 10 both with the frame part 2 and with the molded ring 9 are welded. From Fig. 2 it can be seen that the sheet metal rings 10 have recesses 11 at their lower edge and can therefore only be welded to the frame part between these recesses 11.

Abstract

At the annealing base of a bell-type annealing furnace, a shaping ring (9) projecting over the plate thickness is inserted into the capsule of the filling section (3) formed by the plate material directly under the guide appts. (4) matching its under surface. It forms a support structure together with two concentric plate cylinders (10) on the frame section (2).

Description

Die Erfindung betrifft einen Glühsockel für Haubenglühöfen mit einer das Glühgut, insbesondere gestapelte Blechbunde, aufnehmenden, auf dem Leitapparat eines zentralen Ventilators ruhenden Auflage, einem darunter angeordneten, die Ventilatorachse umgebenden, wärmeisolierenden Füllteil und mit einer die Last vom Leitapparat durch den Füllteil auf einen auf dem Fundament liegenden Rahmenteil übertragenden Stützkonstruktion, wobei der Füllteil aus in Blech gasdicht gekapselter Isolierwolle od.dgl. besteht.The invention relates to an annealing base for bell-type annealing furnaces with a support which receives the annealed material, in particular stacked sheet metal bundles, rests on the guide device of a central fan, a heat insulating filler part arranged underneath it and surrounding the fan axis and with a load on the guide device through the filler part onto one the foundation lying frame part transmitting support structure, the filling part of gas-tight encapsulated insulating wool or the like. consists.

Nach dem Aufsetzen des Glühgutes auf die Auflage wird über das Glühgut und den Sockel eine bis zum Rahmenteil reichende Schutzhaube gestülpt, die ein durch den Ventilator dann umgewälztes Schutzgas, hauptsächlich zur Vermeidung von Oxidationen an der Oberfläche des Glühgutes, enthält. Die Schutzhaube wird dann durch eine Heizhaube abgedeckt, deren Heizeinrichtung, in der Regel Gas- bzw. Ölbrenner oder elektrische Heizelemente, die Schutzhaube außenseitig erwärmt, die dann ihrerseits das Schutzgas und in weiterer Folge das Glühgut erwärmt. Nach erfolgter Wärmebehandlung wird die Heizhaube durch eine Kühlhaube ersetzt und die Charge abgekühlt.After the annealing material has been placed on the support, a protective hood reaching up to the frame part is placed over the annealing material and the base and contains a protective gas then circulated by the fan, mainly to avoid oxidation on the surface of the annealing material. The protective hood is then covered by a heating hood, the heating device of which, as a rule gas or oil burner or electric heating elements, heats the protective hood on the outside, which then in turn heats the protective gas and subsequently the material to be annealed. After the heat treatment, the heating hood is replaced by a cooling hood and the batch is cooled.

Die zur Lastableitung des Glühgutgewichtes an das Fundament dienende Stützkonstruktion des Glühsockels besteht bisher meist aus einzelnen, an das Hüllblech angeschweißten, meist rohrförmigen Stützen, die im oberen Bereich Auflageelemente besitzen, die die bei der Erwärmung oder Abkühlung auftretenden Längenänderungen zwischen dem oberen Hüllblech und dem unteren Rahmenteil durch Gleitreibung oder Biegebeanspruchung der Stützen abfangen, wobei verhältnismäßig große Dilatationen bzw. Kontraktionen auftreten, da der Temperaturunterschied zwischen dem Leitapparat und dem Rahmenteil mehrere hundert Grad beträgt. Bei unsachgemäßer Konstruktion oder Verarbeitung kann es bereits nach kurzer Betriebszeit zu Rissen in der Blechkapsel kommen, so daß eine unerwünschte Vermischung des Schutzgases mit dem im Füllteil auf jeden Fall vorhandenen Gas, nämlich Luft bzw. Stickstoff, auftritt. Derartige Fehler kommen vor allem dadurch zustande, daß eine Relativbewegung an den Gleitflächen beeinträchtigt wird und dadurch Querkräfte in den Stützen auftreten, die zu Schweißrissen Anlaß geben können.The supporting structure of the annealing base used to transfer the weight of the annealing material to the foundation has so far mostly consisted of individual, mostly tubular supports welded to the cladding sheet, which have support elements in the upper area which have the length changes between the upper cladding sheet and the lower one that occur during heating or cooling Catch the frame part by sliding friction or bending stress of the supports, whereby relatively large dilations or contractions occur, since the temperature difference between the guide device and the frame part is several hundred degrees. If the construction or processing is improper, cracks may occur in the sheet metal capsule after a short period of operation, so that undesired mixing of the protective gas with the gas which is in any case present in the filler, namely air or nitrogen, occurs. Such errors are mainly caused by the fact that a relative movement on the sliding surfaces is impaired and lateral forces occur in the supports, which can give rise to welding cracks.

Somit liegt der Erfindung die Aufgabe zugrunde, diesen Mangel zu beseitigen und einen Glühsockel der eingangs geschilderten Art zu schaffen, bei dem keinerlei Risse in der den Füllteil bildenden Kapsel auftreten.The invention is therefore based on the object to remedy this deficiency and to provide a glow socket of the type described, in which no cracks occur in the capsule forming the filling part.

Die Erfindung löst die gestellte Aufgabe dadurch, daß im die Kapsel des Füllteiles bildenden Blech unmittelbar unter dem Leitapparat ein dessen Unterfläche angepaßter, die Blechstärke wesentlich übersteigender Formring eingelassen ist, der durch zwei konzentrische, ihn mit dem Rahmenteil verbindende Blechzylinder die Stützkonstruktion bildet.The invention solves this problem in that in the sheet metal forming the capsule of the filling part, directly underneath the diffuser, a lower surface adapted to the sheet thickness, which substantially exceeds the sheet thickness, is embedded, which forms the supporting structure by means of two concentric sheet metal cylinders connecting it to the frame part.

Die zwei konzentrischen Blechzylinder, die meist mit dem glühraumseitigen Formring fest verschweißt sind, werden von oben her mit der gleichen Temperatur wie dieser beaufschlagt, alle Teile dilatieren daher gleichförmig, so daß es zu keinen Längendifferenzen bzw. Gleitbewegungen zwischen den einzelnen Teilen kommen kann. Die beiden Blechzylinder und der Formring werden bei der Erwärmung um die den betreffenden Werkstoffen entsprechenden Ausdehnungskoeffizienten in ihrem Durchmesser vergrößert und schrumpfen dann wieder während der Abkühlung, ohne daß die Gefahr besteht, Schweißrisse od.dgl. herbeizuführen. Da die im Füllteil enthaltene Isolierwolle od.dgl. elastisch ist, entsteht während dieser Vorgänge keine Öffnung zwischen den Metallteilen und dem Isolationsmaterial, die einen Wärmetransport von oben in den tieferen Sockelbereich zum Fundament hin durch natürliche Gasströmungen ermöglicht.The two concentric sheet metal cylinders, mostly with the are welded firmly on the glow chamber side, the same temperature as this is applied from above, all parts therefore dilate uniformly, so that there can be no length differences or sliding movements between the individual parts. The two sheet metal cylinders and the form ring are increased in diameter when heated by the expansion coefficients corresponding to the materials in question and then shrink again during cooling without the risk of welding cracks or the like. bring about. Since the insulating wool or the like contained in the filling part. is elastic, there is no opening between the metal parts and the insulation material during these processes, which enables heat to be transported from above into the lower plinth area to the foundation through natural gas flows.

In weiterer Ausbildung der Erfindung weist der untere Rand der Blechzylinder Aussparungen auf und ist nur zwischen diesen Aussparungen mit dem Rahmenteil verschweißt. Dadurch wird die Wärmeleitung innerhalb des Blechringes von oben zum Rahmenteil wesentlich vermindert, da ja die Aussparungen eine solche Wärmeleitung verhindern.In a further embodiment of the invention, the lower edge of the sheet metal cylinder has cutouts and is only welded to the frame part between these cutouts. As a result, the heat conduction within the sheet metal ring from the top to the frame part is significantly reduced, since the recesses prevent such heat conduction.

In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt, und zwar zeigen
Fig. 1 einen Glühsockel im Vertikalschnitt und
Fig. 2 einen Teil eines Blechzylinders im Schaubild.In the drawing, the subject matter of the invention is shown, for example, and show
Fig. 1 shows a glow socket in vertical section and
Fig. 2 shows a part of a sheet metal cylinder in the diagram.

Am Fundament 1 liegt ein Rahmenteil 2 auf, der seinerseits Füllteile 3 trägt. Auf den Füllteilen 3 liegt der Leitapparat 4 eines zentralen Ventilators 5 auf, wobei der Leitapparat 4 seinerseits eine Auflage 6 für das Glühgut, in der Regel Blechbunde, trägt. Über den ganzen Glühsockel ist eine Glühhaube 7 gestülpt.On the foundation 1 is a frame part 2, which in turn carries filler parts 3. The guide device 4 of a central fan 5 rests on the filler parts 3, the guide device 4 in turn carrying a support 6 for the annealing material, usually bundles of sheets. A glow hood 7 is placed over the entire glow socket.

Um die Last des Glühgutes von der Auflage 6 auf das Fundament 1 zu übertragen, dient zunächst der Leitapparat 4. Im Füllteil 3, der aus einer gasdichten Blechkapsel besteht und mit Isolierwolle 8 gefüllt ist, ist zur Lastübertragung auf den Rahmenteil 2 eine Stützkonstruktion angeordnet.In order to transfer the load of the annealing material from the support 6 to the foundation 1, the guide device 4 is used first. In the filling part 3, which consists of a gas-tight sheet metal capsule and is filled with insulating wool 8, a support structure is arranged for the load transfer to the frame part 2.

Diese Stützkonstruktion besteht aus einem der Unterfläche des Leitapparates 4 angepaßten, in das Blech des Füllteiles 3 eingelassenen, verhältnismäßig starken Formring 9, der durch zwei konzentrische Blechzylinder 10 mit dem Rahmenteil 2 verbunden ist, wobei diese Blechzylinder 10 sowohl mit dem Rahmenteil 2 als auch mit dem Formring 9 verschweißt sind. Aus Fig. 2 ist ersichtlich, daß die Blechringe 10 an ihrem unteren Rand Aussparungen 11 aufweisen und daher nur zwischen diesen Aussparungen 11 mit dem Rahmenteil verschweißt sein können.This support structure consists of one of the lower surface of the diffuser 4, in the sheet metal of the filling part 3, relatively strong molded ring 9, which is connected by two concentric sheet metal cylinders 10 to the frame part 2, these sheet metal cylinders 10 both with the frame part 2 and with the molded ring 9 are welded. From Fig. 2 it can be seen that the sheet metal rings 10 have recesses 11 at their lower edge and can therefore only be welded to the frame part between these recesses 11.

Claims (2)

Glühsockel für Haubenglühöfen mit einer das Glühgut, insbesondere gestapelte Blechbunde, aufnehmenden, auf dem Leitapparat (4) eines zentralen Ventilators (5) ruhenden Auflage (6), einem darunter angeordneten, die vertikale Ventilatorachse umgebenden, wärmeisolierenden Füllteil (3) und mit einer die Last vom Leitapparat (4) durch den Füllteil (3) auf einen auf dem Fundament (1) liegenden Rahmenteil (2) übertragenden Stützkonstruktion (9, 10), wobei der Füllteil (3) aus in Blech gasdicht gekapselter Isolierwolle od.dgl. besteht, dadurch gekennzeichnet, daß im die Kapsel des Füllteiles (3) bildenden Blech unmittelbar unter dem Leitapparat (4) ein dessen Unterfläche angepaßter, die Blechstärke wesentlich übersteigender Formring (9) eingelassen ist, der durch zwei konzentrische, ihn mit dem Rahmenteil (2) verbindende Blechzylinder (10) die Stützkonstruktion bildet.Annealing base for bell-type annealing furnaces with a support (6) resting on the diffuser (4) of a central fan (5), holding a deposit (6), the heat-insulating filler (3) surrounding the vertical fan axis, and with one Load from the guide device (4) through the filling part (3) on a frame part (2) lying on the foundation (1) transmitting support structure (9, 10), the filling part (3) made of gas-tight encapsulated insulating wool or the like. , characterized in that in the sheet metal forming the capsule of the filling part (3) immediately below the diffuser (4) there is a shaped ring (9) which is adapted to the lower surface thereof and which substantially exceeds the sheet thickness, which is formed by two concentric rings which connect it to the frame part (2 ) connecting sheet metal cylinder (10) forms the support structure. Glühsockel nach Anspruch 1, dadurch gekennzeichnet, daß der untere Rand der Blechzylinder (10) Aussparungen (11) aufweist und nur zwischen diesen Aussparungen mit dem Rahmenteil (2) verschweißt ist.Glow base according to claim 1, characterized in that the lower edge of the sheet metal cylinder (10) has recesses (11) and is only welded to the frame part (2) between these recesses.
EP96890024A 1995-02-24 1996-02-22 Base for bell type furnaces Expired - Lifetime EP0728848B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT337/95 1995-02-24
AT33795 1995-02-24
AT0033795A AT402508B (en) 1995-02-24 1995-02-24 GLOW BASE FOR DOME GLOVES

Publications (3)

Publication Number Publication Date
EP0728848A2 true EP0728848A2 (en) 1996-08-28
EP0728848A3 EP0728848A3 (en) 1996-10-23
EP0728848B1 EP0728848B1 (en) 2001-04-25

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ID=3487914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96890024A Expired - Lifetime EP0728848B1 (en) 1995-02-24 1996-02-22 Base for bell type furnaces

Country Status (14)

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US (1) US5616297A (en)
EP (1) EP0728848B1 (en)
JP (1) JP3899141B2 (en)
KR (1) KR100375213B1 (en)
CN (1) CN1101926C (en)
AT (1) AT402508B (en)
BR (1) BR9600803A (en)
CA (1) CA2169712C (en)
CZ (1) CZ285630B6 (en)
DE (1) DE59606815D1 (en)
ES (1) ES2155928T3 (en)
IN (1) IN185290B (en)
PL (1) PL179461B1 (en)
ZA (1) ZA961115B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102501043B (en) * 2011-10-10 2014-01-22 天津二十冶建设有限公司 Special tool for mounting coil base of bell-type annealing furnace and method therefor
CN117265231B (en) * 2023-09-13 2024-04-23 南通顺祥钢结构有限公司 Heat treatment equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504809A (en) * 1945-10-26 1950-04-18 Carnegie Illinois Steel Corp Annealing stand construction
DE1204246B (en) * 1955-10-24 1965-11-04 Lee Wilson Bell furnace for the heat treatment of rolled wires, rods or the like.
GB1259726A (en) * 1969-01-13 1972-01-12 Bethlehem Steel Corp Improved bell-type furnace
US4813654A (en) * 1987-11-09 1989-03-21 Lee Wilson Engineering Company, Inc. Annealing furnace base construction
US4846675A (en) * 1987-06-01 1989-07-11 Worthington Industries, Inc. Annealing furnace

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179394A (en) * 1963-09-11 1965-04-20 Wilson Eng Co Inc Lee Solid seal for inner covers
DE3233815A1 (en) * 1982-09-11 1984-03-15 Btf-Edelstahlverarbeitung Gmbh & Co Kg, 5928 Laasphe Protective shield for equipment for the heat treatment of workpieces
CN2118961U (en) * 1991-11-11 1992-10-14 哈尔滨工业窑炉联营公司 Bell-jar annealing furnace
DE4212396C2 (en) * 1992-04-13 2001-03-08 Loi Thermprocess Gmbh Bell annealing furnace
US5380378A (en) * 1993-04-23 1995-01-10 Gas Research Institute Method and apparatus for batch coil annealing metal strip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504809A (en) * 1945-10-26 1950-04-18 Carnegie Illinois Steel Corp Annealing stand construction
DE1204246B (en) * 1955-10-24 1965-11-04 Lee Wilson Bell furnace for the heat treatment of rolled wires, rods or the like.
GB1259726A (en) * 1969-01-13 1972-01-12 Bethlehem Steel Corp Improved bell-type furnace
US4846675A (en) * 1987-06-01 1989-07-11 Worthington Industries, Inc. Annealing furnace
US4813654A (en) * 1987-11-09 1989-03-21 Lee Wilson Engineering Company, Inc. Annealing furnace base construction

Also Published As

Publication number Publication date
US5616297A (en) 1997-04-01
DE59606815D1 (en) 2001-05-31
AT402508B (en) 1997-06-25
CA2169712A1 (en) 1996-08-25
ES2155928T3 (en) 2001-06-01
EP0728848A3 (en) 1996-10-23
KR100375213B1 (en) 2003-11-14
CN1101926C (en) 2003-02-19
PL312910A1 (en) 1996-09-02
CZ285630B6 (en) 1999-10-13
BR9600803A (en) 1997-12-23
ZA961115B (en) 1996-12-17
CA2169712C (en) 2001-07-17
CZ55996A3 (en) 1996-09-11
EP0728848B1 (en) 2001-04-25
IN185290B (en) 2000-12-23
CN1171538A (en) 1998-01-28
JP3899141B2 (en) 2007-03-28
PL179461B1 (en) 2000-09-29
KR960031947A (en) 1996-09-17
ATA33795A (en) 1996-10-15
JPH08253806A (en) 1996-10-01

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