EP0660061B1 - Walking beam furnace - Google Patents
Walking beam furnace Download PDFInfo
- Publication number
- EP0660061B1 EP0660061B1 EP94120220A EP94120220A EP0660061B1 EP 0660061 B1 EP0660061 B1 EP 0660061B1 EP 94120220 A EP94120220 A EP 94120220A EP 94120220 A EP94120220 A EP 94120220A EP 0660061 B1 EP0660061 B1 EP 0660061B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- walking beam
- walking
- beams
- beam furnace
- support members
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/02—Skids or tracks for heavy objects
- F27D3/022—Skids
- F27D3/024—Details of skids, e.g. riders
Definitions
- the invention relates to a walking beam furnace with fixed and Walking beam, as it is from the French published application 2 297 390 is known.
- annealing material especially slabs and boards
- Walking beam ovens and pacemaker ovens as they are more uniform Warm up and transport without damage of the annealing material as, for example, pusher furnaces guarantee.
- the lifting and fixed beams mostly consist of Pipes through which coolant flows. While lingering the Annealing goods, in particular on the fixed beams, are created Temperature differences at the contact points of the annealing material up to about 150 ° C, so-called cooling shadows. These affect the surface quality Dimensional accuracy and the technological properties of the Annealing good. The endeavor is therefore an essential one Reduction of the inevitable temperature differences to achieve in the annealing material.
- German interpretation 20 39 507 describes essays, the oblique or off-center in shots a frame welded to cooled support tubes or a retaining bar are used and by means of locking pieces against longitudinal displacement on the pipes be secured.
- German Offenlegungsschrift 41 33 698 concerns one Walking beam furnace with several on walking and / or fixed beams arranged supporting bars. With regard to one The change of the contact points on the annealing good run Support bars diagonally across the width of the lifting or fixed beams and are welded on to the top of the pipe axial longitudinal bar engaged.
- a major disadvantage of the welded beam constructions consists in the high effort for fastening of the supporting pieces.
- the cooled pipes are also standing due to the high temperature differences between chilled Pipe wall and the welded, the hot Brackets, bars exposed to the oven atmosphere and rails under mechanical tension and are therefore at risk of cracking.
- the invention is based on the problem the lifting and / or fixed beams in a walking beam furnace with interchangeable supports for the annealing material equip that the pipes are at risk from stress cracks is much less, being for the editions safe, quick and easy installation as well Disassembly-permitting attachment must be guaranteed should.
- Each support web advantageously consists of one Tube circumference adjusted foot and a pad for example from an end piece running in the feed direction and preferably an adjoining one sloping to the middle of the other Main piece.
- each support bar At the outer ends of each support bar are the Bores for the plug pins.
- the depressions serve to insert the fastening bolts into the holes and sink. To snap the fastening bolts into place the depressions are provided with the locking projections.
- each supporting bridge When attaching the support bars to the lifting or fixed beams each supporting bridge has at least one through an eyelet with the two adjacent supporting bars connected.
- the walking beam furnace 1 has a stove 2 in the feed direction 3 running fixed beams 4 and walking beams 5, which are divided into sections 6, 7.
- the fixed beam sections 6 and the walking beam sections 7 shorter towards the end of the oven, in order to change the Reaching points on the annealing material.
- the fixed and walking beam sections 6, 7 consist of cooled tubes 9 on which periodically left and right of one through the pipe axis vertical plane each other opposite eyelets 10 are welded.
- the Support webs 8 have holes at their outer ends 11 for bolts 12.
- the supporting webs 8 can be between the Place eyelets 10 on pipe 9.
- One pin each 12 is placed in the depressions 13 by the associated Bore 11 and the relevant eyelet 10 into the Bore 11 of the adjacent support web 8 pushed and locked by the locking projection 14 in the indentation 13.
- each support web 8 is connected to two socket pins 12 with an adjacent supporting web 8 and over one plug pin 12 each of the adjacent supporting webs 8 connected to them and at the same time by means of the eyelets 10 held on the cooling tube.
- Each support web 8 has an approximately the width of the Fixed and the walking beam sections 6, 7 corresponding to the Tube circumference curved foot 15, which is on the tube 9 supports.
- the support webs 8 consist of parallel to Pipe axis extending end piece 17 and an oblique to Pipe axis extending main piece 18, which is in the middle the other end of the supporting web 8 or the adjacent one The supporting web ends.
- the end piece 17 and the main piece 18 form a support 16 for the annealing material.
- the supporting webs 8 are arranged that two main pieces 18 lie on a straight line and complement each other so that they are all together - in the top view seen - run diagonally over tube 9.
- the cooling tube 9 is with a highly heat-resistant insulation 19 encased, from which only the edition 16 of the Support bars 8 protrude.
- the oblique course of the pads causes as well as changing fixed and walking beam sections a constant change of the contact points on the annealing material and thus its even heating.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Reciprocating Conveyors (AREA)
Abstract
Description
Die Erfindung betrifft einen Hubbalkenofen mit Fest- und
Hubbalken, wie er aus der französischen Offenlegungsschrift
2 297 390 bekannt ist.The invention relates to a walking beam furnace with fixed and
Walking beam, as it is from the French published
Zum Fördern von Glühgut, insbesondere Brammen und Platinen, durch Öfen während des Glühens dienen bevorzugt Hubbalkenöfen und Schrittmacheröfen, da sie ein gleichmäßigeres Durchwärmen und beschädigungsfreieres Transportieren des Glühgutes als beispielsweise Stoßöfen gewährleisten.For conveying annealing material, especially slabs and boards, by furnaces during annealing are preferred Walking beam ovens and pacemaker ovens as they are more uniform Warm up and transport without damage of the annealing material as, for example, pusher furnaces guarantee.
Beim Transport des Glühgutes durch den Ofen müssen die Form und die Tragfähigkeit der Hub- und der Festbalken auch bei hoher Ofentemperatur gewährleistet sein. Daher bestehen die Hub- und die Festbalken meistens aus von Kühlmitteln durchströmten Rohren. Beim Verweilen des Glühgutes insbesondere auf den Festbalken entstehen jedoch an den Berührungsstellen des Glühgutes Temperaturunterschiede bis zu etwa 150°C, sogenannte Kühlschatten. Diese beeinträchtigen die Oberflächengüte, die Maßhaltigkeit und die technologischen Eigenschaften des Glühgutes. Das Bestreben geht daher dahin, eine wesentliche Verminderung der an sich unvermeidlichen Temperaturunterschiede im Glühgut zu erzielen.When transporting the annealing material through the furnace, the Shape and load capacity of the lifting and fixed beams be guaranteed even at high furnace temperatures. Therefore the lifting and fixed beams mostly consist of Pipes through which coolant flows. While lingering the Annealing goods, in particular on the fixed beams, are created Temperature differences at the contact points of the annealing material up to about 150 ° C, so-called cooling shadows. These affect the surface quality Dimensional accuracy and the technological properties of the Annealing good. The endeavor is therefore an essential one Reduction of the inevitable temperature differences to achieve in the annealing material.
In der deutschen Offenlegungsschrift 20 33 538 ist eine Gleitschiene für Hubbalkenöfen beschrieben, die aus mehreren mit einem Kühlrohr einzeln verschweißten Schienenstücken besteht, die abwechselnd rechts und links seitlich versetzt zur senkrechten Längsmittelebene des Rohres verlaufen. Durch eine besondere Formgebung des Rohres soll die Verringerung der Wärmeabstrahlung aus dem Glühgut verstärkt werden.In German Offenlegungsschrift 20 33 538 there is one Slide rail for walking beam furnaces described that several individually welded with a cooling pipe Rail sections exist, which alternate right and left laterally offset to the vertical longitudinal median plane of the pipe. With a special shape of the tube is said to reduce heat radiation from the annealing material.
Die deutsche Auslegeschrift 20 39 507 beschreibt Aufsatzstücke, die schräg oder außermittig in Aufnahmen eines an gekühlte Tragrohre angeschweißten Rahmens oder einer Halteleiste eingesetzt sind und mittels Arretierungsstücken gegen ein Längsverschieben auf den Rohren gesichert werden.The German interpretation 20 39 507 describes essays, the oblique or off-center in shots a frame welded to cooled support tubes or a retaining bar are used and by means of locking pieces against longitudinal displacement on the pipes be secured.
Die deutsche Offenlegungsschrift 41 33 698 betrifft einen Hubbalkenofen mit mehreren auf Hub- und/oder Festbalken angeordneten Tragstegen. Im Hinblick auf einen Wechsel der Auflagestellen am Glühgut verlaufen die Tragstege schräg über die Breite der Hub- bzw. Festbalken und sind auf einem auf der Rohroberseite angeschweißten axialen Längssteg eingerastet.German Offenlegungsschrift 41 33 698 concerns one Walking beam furnace with several on walking and / or fixed beams arranged supporting bars. With regard to one The change of the contact points on the annealing good run Support bars diagonally across the width of the lifting or fixed beams and are welded on to the top of the pipe axial longitudinal bar engaged.
Ein wesentlicher Nachteil der geschweißten Balkenkonstrutionen besteht in dem hohen Aufwand zum Befestigen der Tragstücke. Des weiteren stehen die gekühlten Rohre aufgrund der hohen Temperaturunterschiede zwischen gekühlter Rohrwand und den aufgeschweißten, der heißen Ofenatmosphäre ungekühlt ausgesetzten Halterungen, Stegen und Schienen unter mechanischen Spannungen und sind daher rißgefährdet.A major disadvantage of the welded beam constructions consists in the high effort for fastening of the supporting pieces. The cooled pipes are also standing due to the high temperature differences between chilled Pipe wall and the welded, the hot Brackets, bars exposed to the oven atmosphere and rails under mechanical tension and are therefore at risk of cracking.
Hiervon ausgehend liegt der Erfindung das Problem zugrunde, in einem Hubbalkenofen die Hub- und/oder Festbalken mit auswechselbaren Auflagen für das Glühgut so auszurüsten, daß die Gefährdung der Rohre durch Spannungsrisse wesentlich geringer ist, wobei für die Auflagen eine sichere, eine schnelle und leichte Montage sowie Demontage zulassende Befestigung gewährleistet sein soll.Proceeding from this, the invention is based on the problem the lifting and / or fixed beams in a walking beam furnace with interchangeable supports for the annealing material equip that the pipes are at risk from stress cracks is much less, being for the editions safe, quick and easy installation as well Disassembly-permitting attachment must be guaranteed should.
Entscheidend ist hierbei, daß die Gesamtlänge der Schweißnähte, die bei hoher Wärmebeanspruchung immer problematisch sind, somit die Größe und/oder die Zahl der Wärmebrücken zwischen den gekühlten Rohren und den Auflagen für das Glühgut möglichst gering sind.It is crucial that the total length of the Welds that always with high heat stress are problematic, therefore the size and / or the number the thermal bridges between the cooled pipes and the Requirements for the annealing material are as small as possible.
Die Lösung des vorerwähnten Problems besteht darin, daß bei Hub- und Festbalken bzw. Hub- und Festbalkenabschnitten, die aus gekühlten Rohren bestehen, an deren Außenseiten Ösen, in Transportrichtung links und rechts in regelmäßigen Abständen, einander gegenüberliegend, beispielsweise angeschweißt sind und die Tragstege Einsenkungen mit Rastvorsprüngen zum Verrasten von Steckbolzen aufweisen. The solution to the above problem is that for lifting and fixed beams or lifting and fixed beam sections, which consist of cooled pipes, on the Outside eyelets, left and right in the direction of transport at regular intervals, facing each other, for example, are welded and depressions in the supporting webs with locking projections for locking plug pins exhibit.
Jeder Tragsteg besteht vorteilhafterweise aus einem dem Rohrumfang angepaßten Fuß und einer Auflage beispielsweise aus einem in Vorschubrichtung verlaufenden Endstück und einem sich daran anschließenden vorzugsweise bis zur Mitte des anderen Tragstegendes schräg verlaufenden Hauptstück.Each support web advantageously consists of one Tube circumference adjusted foot and a pad for example from an end piece running in the feed direction and preferably an adjoining one sloping to the middle of the other Main piece.
An den äußeren Enden jedes Tragsteges befinden sich die Bohrungen für die Steckbolzen. Die Einsenkungen dienen dazu, die Befestigungsbolzen in die Bohrungen einzuführen und zu versenken. Zum Einrasten der Befestigungsbolzen sind die Einsenkungen mit den Rastvorsprüngen versehen.At the outer ends of each support bar are the Bores for the plug pins. The depressions serve to insert the fastening bolts into the holes and sink. To snap the fastening bolts into place the depressions are provided with the locking projections.
Beim Befestigen der Tragstege auf den Hub- bzw. Festbalken wird jeder Tragsteg über jeweils mindestens einen durch eine Öse verlaufenden Steckbolzen mit den beiden benachbarten Tragstegen verbunden.When attaching the support bars to the lifting or fixed beams each supporting bridge has at least one through an eyelet with the two adjacent supporting bars connected.
Fehlt ein benachbarter Tragsteg, dienen entsprechend kürzere Steckbolzen am freien Ende des Tragsteges zum Befestigen am Kühlrohr.If an adjacent supporting bridge is missing, serve accordingly Shorter plug bolts at the free end of the supporting web Attach to the cooling pipe.
Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des näheren erläutert. In der Zeichnung zeigen:
- Fig. 1:
- eine Draufsicht auf den aus Fest- und Hubbalken bestehenden Herd eines Hubbalkenofens,
- Fig 2:
- die Seitenansicht eines Rohres mit einem Tragsteg,
- Fig. 3:
- eine Draufsicht auf mehrere Tragstege,
- Fig. 4:
- einen Querschnitt entlang der Linie A-A in Fig. 3 und
- Fig. 5.
- einen Querschnitt entlang der Linie B-B in Fig. 3.
- Fig. 1 :
- a plan view of the hearth of a walking beam furnace consisting of fixed and walking beams,
- Fig 2 :
- the side view of a tube with a supporting web,
- Fig. 3 :
- a plan view of several supporting bars,
- Fig. 4 :
- a cross section along the line AA in Fig. 3 and
- Fig. 5 .
- 3 shows a cross section along the line BB in FIG. 3.
Der Hubbalkenofen 1 besitzt einen Herd 2 aus in Vorschubrichtung
3 verlaufenden Festbalken 4 und Hubbalken
5, die in Abschnitte 6, 7 unterteilt sind. Die Festbalkenabschnitte
6 und die Hubbalkenabschnitte 7 werden
zum Ofenende hin kürzer, um ein häufiges Wechseln der
Auflagestellen am Glühgut zu erreichen.The
Auf den Fest- und den Hubbalkenabschnitten 6, 7 sind
Tragstege 8 angeordnet, die im gleichen Winkel zur
Längsachse verlaufen. Die Fest- und die Hubbalkenabschnitte
6, 7 bestehen aus gekühlten Rohren 9, auf denen
in regelmäßigen Abständen links und rechts von einer
durch die Rohrachse verlaufenden Vertikalebene einander
gegenüberliegend Ösen 10 angeschweißt sind. Die
Tragstege 8 besitzen an ihren äußeren Enden Bohrungen
11 für Steckbolzen 12. An jedem Tragsteg 8 befinden
sich zudem zwei nebeneinanderliegenden Einsenkungen 13
mit Rastvorsprüngen 14. Zu jeder Einsenkung 13 gehört
eine Bohrung 11.On the fixed and
Zur Montage lassen sich die Tragstege 8 zwischen den
Ösen 10 auf das Rohr 9 aufsetzen. Je ein Steckbolzen 12
wird in die Einsenkungen 13 gelegt, durch die zugehörige
Bohrung 11 und die betreffende Öse 10 bis in die
Bohrung 11 des benachbarten Tragsteges 8 geschoben und
durch den Rastvorsprung 14 in der Einsekung 13 verrastet.For assembly, the supporting
Auf diese Weise wird jeder Tragsteg 8 über zwei Steckbolzen
12 mit je einem benachbarten Tragsteg 8 und über
je einen Steckbolzen 12 der benachbarten Tragstege 8
mit diesen verbunden und gleichzeitig mittels der Ösen
10 auf dem Kühlrohr gehalten.In this way, each
Jeder Tragsteg 8 weist einen etwa in der Breite der
Fest- und der Hubbalkenabschnitte 6, 7 entsprechend dem
Rohrumfang gekrümmten Fuß 15 auf, der sich auf dem Rohr
9 abstützt. Die Tragstege 8 bestehen aus parallel zur
Rohrachse verlaufenden Endstück 17 und einem schräg zur
Rohrachse verlaufenden Hauptstück 18, das in der Mitte
des anderen Endes des Tragsteges 8 bzw. des benachbarten
Tragsteges endet. Das Endstück 17 und das Hauptstück
18 bilden eine Auflage 16 für das Glühgut.Each
Bei der Montage werden die Tragstege 8 so angeordnet,
daß je zwei Hauptstücke 18 auf einer Geraden liegen und
sich so ergänzen, daß sie insgesamt - in der Draufsicht
gesehen - diagonal über das Rohr 9 verlaufen. During assembly, the supporting
Das Kühlrohr 9 ist mit einer hochhitzebeständigen Isolierung
19 ummantelt, aus der nur die Auflage 16 der
Tragstege 8 herausragt.The
Die Benutzung angeschweißter Ösen zum Befestigen der Tragstege beschränkt die Verbindung und damit die Wärmebrücken zwischen Rohr und Tragstegen auf kurze Zonen in verhältnismäßig großen Abständen.The use of welded eyelets to attach the Support bars limit the connection and thus the thermal bridges between tube and supporting bars in short zones at relatively large intervals.
Auf diese Weise werden Wärmespannungen im Rohr, hervorgerufen durch große Temperaturunterschiede zwischen der gekühlten Rohrwandung und der Glühgutauflage, beträchtlich vermindert. Die Gefahr einer Rißbildung ist daher wesentlich geringer als bei einem Verschweißen der Glühgutauflage bzw. Tragstege über deren ganze Länge mit dem Rohr. Hinzu kommt, daß sich die Tragstege mit Hilfe der Steckbolzen leicht und schnell montieren und jederzeit demontieren lassen. Das erlaubt einen schnellen Austausch beschädigter Tragstücke gegen neue und verkürzt so die Stillstandszeiten bei Ofenreparaturen.In this way, thermal stresses are created in the pipe due to large temperature differences between the cooled pipe wall and the annealing deposit, considerable reduced. There is therefore a risk of cracking much less than when welding the Annealing material support or supporting bars over their entire length with the pipe. In addition, the supporting bars with Assemble easily and quickly with the help of the plug pins can be dismantled at any time. That allows a quick one Exchange of damaged supports for new and this shortens downtimes for furnace repairs.
Darüber hinaus bewirkt der schräge Verlauf der Auflagen sowie der Wechsel von Fest- und Hubbalkenabschnitten einen ständigen Wechsel der Auflagestellen am Glühgut und damit dessen gleichmäßiges Erwärmen.In addition, the oblique course of the pads causes as well as changing fixed and walking beam sections a constant change of the contact points on the annealing material and thus its even heating.
Claims (7)
- A walking beam furnace comprising a hearth made up of cooled fixed beams (4, 6) and cooled walking beams (5, 7) provided with short fastening members (10) for support members (8) having bores (11) for sliding bolts (12) passing through them, characterised in that the fastening members comprise eyes (10) and are arranged to the left and right of a vertical longitudinal centre plane of the respective beam (4, 5, 6, 7) at regular distances apart and opposite one another, and that the support members (8) have depressions (13) with locking extensions (14) for locking the sliding bolts (12).
- A walking beam furnace according to claim 1, characterised in that the support members (8) comprise a foot (15) adapted to the circumference of the pipe and a supporting portion (16).
- A walking beam furnace according to claim 2, characterised in that the supporting portion (16) comprises an end portion (17) running in the feeding direction and a main portion (18) running obliquely to the axis of the pipe.
- A walking beam furnace according to one of claims 2 and 3, characterised in that the walking beams and the fixed beams (4, 5, 6, 7) and the foot (15) have highly refractory insulation (19) which leaves only the upper region of the supporting portion (16) exposed.
- A walking beam furnace according to one of claims 1 to 4, characterised in that several support members (8) are fitted on one walking beam (5, 7) and/or on one fixed beam (4, 6).
- A walking beam according to one of claims 1 to 5, characterised in that the walking beams and the fixed beams (4, 5) are divided into sections (6, 7).
- A walking beam furnace according to claim 6, characterised in that several support members (8) are fitted on one section (6, 7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4343675A DE4343675A1 (en) | 1993-12-21 | 1993-12-21 | Walking beam furnace |
DE4343675 | 1993-12-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0660061A1 EP0660061A1 (en) | 1995-06-28 |
EP0660061B1 true EP0660061B1 (en) | 1999-03-10 |
Family
ID=6505665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94120220A Expired - Lifetime EP0660061B1 (en) | 1993-12-21 | 1994-12-20 | Walking beam furnace |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0660061B1 (en) |
AT (1) | ATE177526T1 (en) |
DE (1) | DE4343675A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19710870A1 (en) * | 1997-03-15 | 1998-09-17 | Techint Italimpianti Deutschla | Walking beam furnace |
AT409670B (en) | 2001-01-15 | 2002-10-25 | Hertwich Engineering Gmbh | LIFTING BAR CONVEYOR FOR A CONTINUOUS HOLDER FOR HEATING ALUMINUM BARS |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2039508C3 (en) * | 1970-08-08 | 1973-12-06 | Huettenwerk Oberhausen Ag, 4200 Oberhausen | Pusher furnace |
IT1052862B (en) * | 1975-01-11 | 1981-07-20 | Krupp Ag Huettenwerke | TUBULAR CARRIER ELEMENT FOR OVENS FOR HEAT TREATMENTS |
DE3434356C2 (en) * | 1984-09-19 | 1986-01-23 | Engels, Paul, 4030 Ratingen | Attachments for cooled support tubes in heating ovens |
DE4133698A1 (en) * | 1991-10-11 | 1993-04-15 | Italimpianti Deutschland Gmbh | RIFLE BAR OVEN |
DE4203595C2 (en) * | 1992-02-10 | 2001-07-19 | Loi Thermprocess Gmbh | Device for supporting feed material in a heating furnace |
IT1261896B (en) * | 1993-02-03 | 1996-06-03 | Stefano Deplano | LONGHERONI OVEN FOR THE ACCELERATED HEATING OF BILLETS, OR SIMILAR. |
-
1993
- 1993-12-21 DE DE4343675A patent/DE4343675A1/en not_active Withdrawn
-
1994
- 1994-12-20 EP EP94120220A patent/EP0660061B1/en not_active Expired - Lifetime
- 1994-12-20 AT AT94120220T patent/ATE177526T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE177526T1 (en) | 1999-03-15 |
EP0660061A1 (en) | 1995-06-28 |
DE4343675A1 (en) | 1995-06-22 |
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