GB2210305A - Refractory monoblock stopper - Google Patents
Refractory monoblock stopper Download PDFInfo
- Publication number
- GB2210305A GB2210305A GB8723160A GB8723160A GB2210305A GB 2210305 A GB2210305 A GB 2210305A GB 8723160 A GB8723160 A GB 8723160A GB 8723160 A GB8723160 A GB 8723160A GB 2210305 A GB2210305 A GB 2210305A
- Authority
- GB
- United Kingdom
- Prior art keywords
- refractory
- stopper
- bushing
- cross
- pin
- 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.)
- Withdrawn
Links
- 230000008602 contraction Effects 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 239000011819 refractory material Substances 0.000 abstract description 2
- 238000000462 isostatic pressing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000261422 Lysimachia clethroides Species 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
- B22D41/18—Stopper-rods therefor
- B22D41/186—Stopper-rods therefor with means for injecting a fluid into the melt
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
A refractory monoblock stopper (1) has a rounded nose (2) at one end for locating in a refractory outflow nozzle (3) in a tundish (4), an axial bore (5) extending throughout its length, and at its other end, the stopper is bored across the bore (5) where heat-resistant bushings (7) are located in the refractory material of the stopper to render the stopper more resistant to point stress loading in use when supported by a control mechanism including a hanger bolt (9) and cross-pin (14). The bushings (7) are incorporated during isostatic pressing of the stopper and may be split to accommodate thermal expansion/contraction, or formed with flats or protrusions to facilitate location. The bushes are of steel. <IMAGE>
Description
REFRACTORY MONOBLOCK STOPPERS
Description
This invention relates to refractory monoblock stoppers.
The use of cross-pin fastening of refractory monoblock stoppers is well established as a means of connecting them to the control mechanism and it provides a simple efficient system well suited to the rigours of the steel plant environment.
However it has been found that in everyday operation the support steelwork becomes deformed or mis-shapen; this is especially true of the hanger bolts and cross-pins.
In such cases there is a risk that when the stopper is being assembled and put into service these distortions can result in point load stresses being applied to the refractory body. As all refractories are relatively weak in tension there is a risk of cracks being set up in the pieces rendering them unsafe for use.
An object of the invention is to improve the security of the cross-pin mounting system by means obviating or mitigating the aforesaid problem, and substantially eliminating point loading even when deformed steelwork components are used.
Accordingly, this invention provides a refractory monoblock stopper formed by isostatic pressure and having an end portion adapted to receive support means including a hanger bolt and a cross-pin, wherein the end portion has embodied in it heat-resistant metal bushing for receiving the cross-pin.
Preferably, the bushing is split o allow for differential thermal-expansion and contraction of the refractory and the bushing and also to resist turning of the bushing in the refractory, the split being disposed remote from the intended load-bearing region of the bushing.
Alternatively, the bushing may be continuous and include flats or protrusions for Location in the refractory.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawing showing, in axial section, a refractory monoblock stopper, according to the invention, in its working environment depending from a control mechanism and overhanging a tundish outflow nozzle.
In the drawing, a refractory monoblock stopper 1 has a rounded nose 2 at its lower end for locating in a refractory outflow nozzle 3 in a tundish 4. The stopper has an axial bore 5 extending from its upper end and, as shown, this may be extended by a narrower bore 6 opening at the nose 2 for the introduction of argon. Alternatively, the bore 5 may be blind at its lower end.
At the upper end the stopper 1 is bored across the bore 5 where two split heat-resistant steel bushes 7 are embodied in the refractory and disposed diametrically opposite each other. The split (not shown) in each bush 7 is disposed remotely from the upper side thereof and preferably directly at the bottom thereof.
A control mechanism includes a gooseneck 8 in which a hanger bolt 9 extends through a bore 10 and is secured by nuts 11 and 12. The hanger bolt 9 has a plain lower end 13 extending into the bore 5 and having a cross bore which is aligned with the bushes 7 and all of which receive a cross-pin 14. Another nut 15 is provided on the bolt 9 to tighten the cross-pin 14 in the bushes 7.
The bushes 7 are embodied in the refractory and properly positioned therein as the refractory monoblock stopper is being formed by isostatic pressure. By incorporating heat-resistant bushes into the refractory body during the forming process a stopper is produced which is considerably more resistant to point stress loading, with strengths tested at 60% to 80% greater than the conventional stoppers.
The specific design and materials used in these bushes, together with the specialist tooling and manufacturing techniques allow the bushes to spread evenly any point loads they receive onto the full wall thickness of the refractory, thus allowing the stopper to operate satisfactorily with much greater tolerance of deformities and other variables within the steel plant operation.
The forming techniques allow the bushes to be positioned correctly and be in intimate contact with the refractory body at all times and thus able to spread point load stresses effectively. The position is maintained during manufacture and use by the bush being keyed into the refractory but at the same time able to take up any variations in thermal expansion between the metal and ceramic.
However, continuous bushes may be used instead provided some means of preventing rotation is incorporated, ie. flats or protrusions.
Claims (5)
1. A refractory monoblock stopper formed by isostatic pressure and having an end-portion adapted to receive support means including a hanger bolt and a cross-pin, wherein the end portion has embodied in it heat-resistant metal bushing for receiving the cross-pin.
2. A stopper according to claim 1 wherein the bushing is split to allow for differential thermal-expansion and contraction of the refractory and the bushing and also to resist turning of the bushing in the refractory, the split being disposed remote from the intended loadbearing region of the bushing.
3. A stopper according to claim 1 wherein the bushing is a continuous bushing which is provided with flats or protrusions to facilitate location thereof in the refractory.
4. A stopper according to claim 1 or claim 2 or claim 3 wherein the bushing is positioned within the refractory prior to formation of the stopper by isostatic pressure.
5. A refractory monoblock stopper substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8723160A GB2210305A (en) | 1987-10-02 | 1987-10-02 | Refractory monoblock stopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8723160A GB2210305A (en) | 1987-10-02 | 1987-10-02 | Refractory monoblock stopper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8723160D0 GB8723160D0 (en) | 1987-11-04 |
| GB2210305A true GB2210305A (en) | 1989-06-07 |
Family
ID=10624697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8723160A Withdrawn GB2210305A (en) | 1987-10-02 | 1987-10-02 | Refractory monoblock stopper |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2210305A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990008611A1 (en) * | 1989-01-26 | 1990-08-09 | Thor Ceramics Limited | Rotor |
| WO1995003145A1 (en) * | 1993-07-23 | 1995-02-02 | Burkhard Labod | Arrangement for securing a stopper rod for a metallurgical vessel to its lifting device, stopper rod suitable for the arrangement and process for producing the arrangement |
| EP1430975A1 (en) * | 2002-12-17 | 2004-06-23 | Vesuvius Crucible Company | Tool for use with molten metal, assembly and method for attachment thereof |
| US6913730B2 (en) * | 2001-06-08 | 2005-07-05 | Vesuvius Crucible Company | Stopper rod |
| CN109513911A (en) * | 2018-12-24 | 2019-03-26 | 中冶陕压重工设备有限公司 | A kind of casting device of Split type multipurpose |
-
1987
- 1987-10-02 GB GB8723160A patent/GB2210305A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990008611A1 (en) * | 1989-01-26 | 1990-08-09 | Thor Ceramics Limited | Rotor |
| WO1995003145A1 (en) * | 1993-07-23 | 1995-02-02 | Burkhard Labod | Arrangement for securing a stopper rod for a metallurgical vessel to its lifting device, stopper rod suitable for the arrangement and process for producing the arrangement |
| US5695675A (en) * | 1993-07-23 | 1997-12-09 | Labod; Burkhard | Arrangement and method for connection of a stopper rod for a metallurgical vessel to a lifting device |
| JP3272726B2 (en) | 1993-07-23 | 2002-04-08 | ラボッド、ブルクハルド | Apparatus for connecting a stopper rod for a metallurgical vessel to a lifting apparatus, stopper rod adapted to the apparatus, and method of manufacturing the apparatus |
| US6913730B2 (en) * | 2001-06-08 | 2005-07-05 | Vesuvius Crucible Company | Stopper rod |
| EP1430975A1 (en) * | 2002-12-17 | 2004-06-23 | Vesuvius Crucible Company | Tool for use with molten metal, assembly and method for attachment thereof |
| CN109513911A (en) * | 2018-12-24 | 2019-03-26 | 中冶陕压重工设备有限公司 | A kind of casting device of Split type multipurpose |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8723160D0 (en) | 1987-11-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |