EP0835943B1 - Under bell for the CAS-OB process - Google Patents
Under bell for the CAS-OB process Download PDFInfo
- Publication number
- EP0835943B1 EP0835943B1 EP97114813A EP97114813A EP0835943B1 EP 0835943 B1 EP0835943 B1 EP 0835943B1 EP 97114813 A EP97114813 A EP 97114813A EP 97114813 A EP97114813 A EP 97114813A EP 0835943 B1 EP0835943 B1 EP 0835943B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bell
- flange
- under
- cas
- reinforcement element
- 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
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- 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
- F27D3/0025—Charging or loading melting furnaces with material in the solid state
- F27D3/0026—Introducing additives into the melt
-
- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D2001/0046—Means to facilitate repair or replacement or prevent quick wearing
Definitions
- the invention relates to a lower bell for the CAS-OB method according to the preamble of claim 1.
- Such sub bells also called CAS OB sub bells, are connected with an upper bell and in the steel mill directly immersed in molten steel to inside the Bell to alloy the existing steel and / or those in it located melt by aluminothermic heating heat.
- Known lower bells consist essentially of the Steel flange, which is used to hold the top bell, whereby a circumferential sheet metal jacket is attached to this steel flange becomes.
- the sheet metal jacket then receives an inside and Outer cladding made of fireproof material so that it completely especially down from the refractory Material is surrounded.
- Such a lower bell is used in the melt thermally stressed, from all sides, see above that in extreme cases with long temperature treatments Melting of the reinforcement and thus cracks and holes in the Refractory concrete can arise. Due to the Temperature stress from inside and outside can also be too Partitions between the outer part of the refractory material and the inner part of the refractory material come what also quickly leads to failure of the lower bell.
- the present invention is concerned with a Improvement of the lower bell of the type mentioned in order to to achieve a longer lifespan. This is achieved by the in the characterizing parts of the claims specified characteristics.
- the lower bell shows according to the invention no closed casing.
- the Reinforcement part is in one embodiment by a A plurality of bars distributed evenly over the circumference educated. These are welded to the flange and are in turn provided with protruding parts.
- the flange and the downward protruding bars are in a shape on all sides with refractory material, vibrating concrete or Pouring refractory concrete.
- the conventional sheet metal jacket used for a lower bell is distributed over the circumference formed with a plurality of vertical slots.
- the reinforcement part either as one A plurality of rods or as a sheet metal jacket with longitudinal slots is achieved that the inner and the outer part of the Refractory material is connected to each other so that no thermal stresses and cracks can occur. Of course, this leads to a longer service life the lower bell.
- the rods of the lower part of the lower bell according to the Invention can be designed as gate steel rods and be equipped with V-anchors. You can use gaps on the scope between 100 and 300 mm and via a ring line be connected.
- a similar construction according to the invention has between the vertical longitudinal slots of the sheet metal jacket V-anchor.
- V and U-anchors can be attached to the mounting flange
- the lifespan of lower bells according to the invention can a multiple of that of conventional under bells to reach.
- the upper ring flange is 10 Inscribed bell. Inferior to this lower flange directed below a ring part which with the flange 10th connected is.
- a plurality of rods 12 are on the ring flange attached, it can be round rods in the area trade from 10 to 20 mm in diameter. In the figure are only shown a total of six such rods.
- the rods 12 are welded to the flange 10 and have substantially an axial extension.
- There is one on each of the rods 12 A plurality of anchors, rods 14 or the like. Attached.
Description
Die Erfindung bezieht sich auf eine Unterglocke für das CAS-OB-Verfahren nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a lower bell for the CAS-OB method according to the preamble of claim 1.
Derartige Unterglocken, auch CAS-OB-Unterglocken genannt, werden mit einer Oberglocke verbunden und im Stahlwerk direkt in flüssigen Stahl getaucht, um im Innenraum der Glocke den vorhandenen Stahl zu legieren und/oder die darin befindliche Schmelze durch aluminothermisches Heizen zu erhitzen.Such sub bells, also called CAS OB sub bells, are connected with an upper bell and in the steel mill directly immersed in molten steel to inside the Bell to alloy the existing steel and / or those in it located melt by aluminothermic heating heat.
Bekannte Unterglocken bestehen im wesentlichen aus dem Stahlflansch, der der Aufnahme der Oberglocke dient, wobei an diesem Stahlflansch ein umlaufender Blechmantel befestigt wird. Der Blechmantel erhält dann eine Innen- und Außenverkleidung aus feuerfestem Material, so daß er vollständig insbesondere auch unten von dem feuerfesten Material umgeben ist.Known lower bells consist essentially of the Steel flange, which is used to hold the top bell, whereby a circumferential sheet metal jacket is attached to this steel flange becomes. The sheet metal jacket then receives an inside and Outer cladding made of fireproof material so that it completely especially down from the refractory Material is surrounded.
Eine derartige Unterglocke wird beim Einsatz in der Schmelze thermisch stark beansprucht, und zwar von allen Seiten, so daß im Extremfall bei langen Temperaturbehandlungen Aufschmelzungen der Armierung und damit Risse und Löcher im Feuerbeton entstehen können. Aufgrund der Temperaturbeanspruchung von innen und außen kann es auch zu Trennungen zwischen dem äußeren Teil des Feuerfestmaterials und dem inneren Teil des Feuerfestmaterials kommen, was ebenfalls rasch zum Ausfall der Unterglocke führt.Such a lower bell is used in the melt thermally stressed, from all sides, see above that in extreme cases with long temperature treatments Melting of the reinforcement and thus cracks and holes in the Refractory concrete can arise. Due to the Temperature stress from inside and outside can also be too Partitions between the outer part of the refractory material and the inner part of the refractory material come what also quickly leads to failure of the lower bell.
Die vorliegende Erfindung beschäftigt sich mit einer Verbesserung der Unterglocke der eingangs genannten Art, um eine längere Lebensdauer zu erzielen. Erreicht wird dies durch die in den kennzeichnenden Teilen der Ansprüche angegebenen Merkmale.The present invention is concerned with a Improvement of the lower bell of the type mentioned in order to to achieve a longer lifespan. This is achieved by the in the characterizing parts of the claims specified characteristics.
Im Gegensatz zu bekannten Unterglocken weist die Unterglocke gemäß der Erfindung keine geschlossene Ummantelung auf. Der Verstärkungsteil ist in einer Ausführungsform durch eine Mehrzahl von gleichmäßig über Umfang verteilten Stäben gebildet. Diese werden an den Flansch angeschweißt und sind ihrerseits mit vorstehenden Teilen versehen. Der Flansch und die nach unten vorstehenden Stäbe werden in einer Form allseitig mit Feuerfestmaterial, Vibrierbeton oder Feuerbeton umgossen.In contrast to known lower bells, the lower bell shows according to the invention no closed casing. The Reinforcement part is in one embodiment by a A plurality of bars distributed evenly over the circumference educated. These are welded to the flange and are in turn provided with protruding parts. The flange and the downward protruding bars are in a shape on all sides with refractory material, vibrating concrete or Pouring refractory concrete.
Bei einer anderen Ausführungsform wird zwar der konventionelle Blechmantel bei einer Unterglocke verwendet, allerdings ist dieser Blechmantel über den Umfang verteilt mit einer Mehrzahl von Vertikalschlitzen ausgebildet.In another embodiment, the conventional sheet metal jacket used for a lower bell, however, this sheet metal jacket is distributed over the circumference formed with a plurality of vertical slots.
Durch die Ausbildung des Verstärkungsteils entweder als eine Mehrzahl von Stäben oder als Blechmantel mit Längsschlitzen wird erreicht, daß der innere und der äußere Teil des Feuerfestmaterial miteinander in Verbindung ist, so daß keine thermischen Spannungen und Risse auftreten können. Dies führt selbstverständlich zu einer größeren Lebensdauer der Unterglocke.By designing the reinforcement part either as one A plurality of rods or as a sheet metal jacket with longitudinal slots is achieved that the inner and the outer part of the Refractory material is connected to each other so that no thermal stresses and cracks can occur. Of course, this leads to a longer service life the lower bell.
Die Stangen des Verfestigungsteils der Unterglocke gemäß der Erfindung können als Torstahlstangen ausgebildet sein und mit V-Ankern bestückt sein. Sie können am Umfang Abstände zwischen 100 bis 300 mm haben und über eine Ringleitung miteinander verbunden sein. Eine ähnliche Konstruktion gemäß der Erfindung weist zwischen den vertikalen Längsschlitzen des Blechmantels V-Anker auf. Zusätzlich können noch V- und U-Anker am Montageflansch angebracht werden The rods of the lower part of the lower bell according to the Invention can be designed as gate steel rods and be equipped with V-anchors. You can use gaps on the scope between 100 and 300 mm and via a ring line be connected. A similar construction according to the invention has between the vertical longitudinal slots of the sheet metal jacket V-anchor. In addition, V and U-anchors can be attached to the mounting flange
Alle diese Maßnahmen dienen dazu, einen durchgängigen Verbund des Feuerfestmaterials bei einer Minimierung thermischer Spannungen bei der Trocknung zu erreichen.All of these measures serve to ensure a consistent Compounding the refractory material with minimization to achieve thermal stresses during drying.
Die Lebensdauer von Unterglocken gemäß der Erfindung können ein mehrfaches derjenigen konventioneller Unterglocken erreichen.The lifespan of lower bells according to the invention can a multiple of that of conventional under bells to reach.
Die Erfindung wird nachstehend anhand der Zeichnung beispielsweise erläutert.The invention is described below with reference to the drawing for example explained.
Die einzige Figur der Zeichnung zeigt einen vertikalen Längsschnitt durch eine Unterglocke gemäß der Erfindung.The only figure in the drawing shows a vertical one Longitudinal section through a lower bell according to the invention.
In der Figur ist mit 10 der obere Ringflansch der Unterglocke bezeichnet. An diesem Unterflansch steht nach unten gerichtet ein Ringteil vor, der mit dem Flansch 10 verbunden ist.In the figure, the upper ring flange is 10 Inscribed bell. Inferior to this lower flange directed below a ring part which with the flange 10th connected is.
An dem Ringflansch ist eine Mehrzahl von Stangen 12
befestigt, es kann sich hierbei um Rundstangen im Bereich
von 10 bis 20 mm Durchmesser handeln. In der Figur sind nur
insgesamt sechs derartige Stäbe gezeigt. Die Stäbe 12 sind
an dem Flansch 10 angeschweißt und haben im wesentlichen
eine axiale Erstreckung. An den Stäben 12 ist jeweils eine
Mehrzahl von Ankern, Stäben 14 oder dgl. angebracht.A plurality of
Mit 11 ist das Feuerfestmaterial bezeichnet, welches die
Stäbe 12 vollständig umgibt.With 11 the refractory material is designated, which the
Claims (4)
- Under-bell for the CAS-OB (Composition Adjustment by Sealed argon bubbling - Oxygen Blowing) process in steelplants, comprising a horizontally directed flange to hold the upper bell and a metallic reinforcement element attached to the flange, which is surrounded by a flame-resistant material,
characterised in that
the reinforcement element is formed of a multiplicity of vertically directed steel bars (12), which are distributed uniformly around the circumference of the flange (10) and are surrounded by a flame-resistant material (11). - Under-bell according to Claim 1,
characterised in that
the steel bars are connected to one another by a ring cable. - Under-bell according to Claims 1 or 2,
characterised in that
the steel bars (12) have a multiplicity of projecting rods (14). - Under-bell for the CAS-OB (Composition Adjustment by Sealed argon bubbling - Oxygen Blowing) process in steelplants, comprising a horizontally directed flange to hold the upper bell and a metallic reinforcement element attached to the flange, which is surrounded by a flame-resistant material,
characterised in that
the reinforcement element (12) is formed as a sheet cylinder having a multiplicity of essentially vertically directed longitudinal slits.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29617580U | 1996-10-09 | ||
| DE29617580U DE29617580U1 (en) | 1996-10-09 | 1996-10-09 | Lower bell for the CAS-OB process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0835943A1 EP0835943A1 (en) | 1998-04-15 |
| EP0835943B1 true EP0835943B1 (en) | 2000-09-27 |
Family
ID=8030366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97114813A Expired - Lifetime EP0835943B1 (en) | 1996-10-09 | 1997-08-27 | Under bell for the CAS-OB process |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0835943B1 (en) |
| DE (2) | DE29617580U1 (en) |
| ES (1) | ES2152609T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978338B (en) * | 2012-11-26 | 2014-10-08 | 北京首钢自动化信息技术有限公司 | Method for automatically controlling CAS (composition adjustment by sealed argon bubbling)-OB (oxygen blowing) |
| CN115284438A (en) * | 2022-07-22 | 2022-11-04 | 鞍山市和丰耐火材料有限公司 | Manufacturing method for prolonging service life of lower cover of CAS-OB impregnation cover |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0000466A1 (en) * | 1977-07-13 | 1979-02-07 | VOEST-ALPINE Aktiengesellschaft | Method for adding granular materials to a molten metal and apparatus for the performance of the aforesaid method |
| SE8101242L (en) * | 1981-02-26 | 1982-08-27 | Scandinavian Lancers | PROCEDURE AND DEVICE FOR THE DISTRIBUTION OF CHECK Means |
-
1996
- 1996-10-09 DE DE29617580U patent/DE29617580U1/en not_active Expired - Lifetime
-
1997
- 1997-08-27 DE DE59702400T patent/DE59702400D1/en not_active Expired - Lifetime
- 1997-08-27 ES ES97114813T patent/ES2152609T3/en not_active Expired - Lifetime
- 1997-08-27 EP EP97114813A patent/EP0835943B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2152609T3 (en) | 2001-02-01 |
| EP0835943A1 (en) | 1998-04-15 |
| DE29617580U1 (en) | 1996-12-12 |
| DE59702400D1 (en) | 2000-11-02 |
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