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Sommaire du brevet 1315100 

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Disponibilité de l'Abrégé et des Revendications

L'apparition de différences dans le texte et l'image des Revendications et de l'Abrégé dépend du moment auquel le document est publié. Les textes des Revendications et de l'Abrégé sont affichés :

  • lorsque la demande peut être examinée par le public;
  • lorsque le brevet est émis (délivrance).
(12) Brevet: (11) CA 1315100
(21) Numéro de la demande: 1315100
(54) Titre français: BOUCHON POUR CONVERTISSEUR D'ACIERIE UTILISE POUR MINIMISER LES FUITES DE SCORIES
(54) Titre anglais: PLUG FOR USE IN A STEEL CONVERTER TO MINIMIZE TAPPING OFF OF SLAG
Statut: Périmé et au-delà du délai pour l’annulation
Données bibliographiques
(51) Classification internationale des brevets (CIB):
  • F27D 3/15 (2006.01)
  • C21C 5/46 (2006.01)
(72) Inventeurs :
  • TRENTELMAN, JOZEF G. M.
(73) Titulaires :
(71) Demandeurs :
(74) Agent: SMART & BIGGAR LP
(74) Co-agent:
(45) Délivré: 1993-03-30
(22) Date de dépôt: 1989-05-10
Licence disponible: S.O.
Cédé au domaine public: S.O.
(25) Langue des documents déposés: Anglais

Traité de coopération en matière de brevets (PCT): Non

(30) Données de priorité de la demande:
Numéro de la demande Pays / territoire Date
8801231 (Pays-Bas (Royaume des)) 1988-05-11

Abrégés

Abrégé anglais


PLUG FOR USE IN A STEEL CONVERTER
TO MINIMIZE TAPPING OFF OF SLAG
ABSTRACT OF THE DISCLOSURE
A plug of refractory material is used in a
steel converter to minimize tapping off of slag. In
use it floats at the steel/slag interface and lodges in
the taphole to indicate the end of tapping. The plug
has a polyhedral shape and is shankless. To improve
its ability to roll the plug has a surface which
consists of a plurality of generally flat faces lying
in respective planes with the planes of every adjacent
pair of faces intersecting at angles not less than 90°
and the plane of each face intersecting the plane of at
least one adjacent face at an angle greater than 90°.
Preferably the plug has two symmetrical tapering
halves.

Revendications

Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.


THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A plug of refractory material for use in a
steel converter to minimize tapping off of slag, the
plug being a body of a polyhedral shape and being
shankless, said body having a surface consisting of a
plurality of generally flat faces lying in respective
planes with the planes of every adjacent pair of said
faces intersecting each other at angles not less than
90° and the plane of each said face intersecting the
plane of at least one adjacent face at an angle greater
than 90°.
2. A plug according to claim 1 wherein the planes
of every adjacent pair of said faces intersect at
angles greater than 90°.
3. A plug according to claim 1 wherein said body
has mutually symmetrical upper and lower halves meeting
at a common plane which has a larger area than any
section of the upper and lower halves parallel to it.
4. A plug according to claim 3 wherein said
common plane of the upper and lower halves has
substantially a rectangular shape.
5. A plug according to claim 3 wherein said flat
faces of the body include a top face and a bottom face
both parallel to said common plane.
6. A plug according to claim 3 wherein at least

some adjacent pairs of said faces meet at rounded zones
of the body surface.
7. A plug of refractory material for use in a
steel converter to minimize tapping off of slag, said
plug being shankless and being a body of polyhedral
shape having a central plane of symmetry and mutually
symmetrical upper and lower halves on each side of said
central plane, each said half having (a) a plurality of
first planar faces each meeting said central plane of
symmetry and extending away therefrom at an angle less
than 90°, (b) a second planar face meeting all said
first planar faces and lying parallel to said central
plane of symmetry and (c) a plurality of bevel faces
each located at a meeting point of two of said first
planar faces and said second planar face.
8. A plug according to claim 7 having rounded
surfaces at meeting zones of each adjacent pair of said
first planar faces.
9. A method of tapping a steel converter
comprising the steps of (i) placing a plug according to
claim 1 in the molten bath in the converter, the plug
having a density such that it floats at the interface
of steel and slag and (ii) tapping the steel from the
furnace via a taphole in a manner such that the plug
lodges in the tanhole.

Description

Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.


131S~OO
PLUG FOR USE IN A STEEL CONVERTER TO MINIMIZE TAPPING
OFF OF SLAG
BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
The invention relates to a plug of refractory
material for use in a steel converter to minimize
tapping off of slag from the converter, and also to a
method of tapping a steel converter using such a plug.
2. DESCRIPTION OF THE PRIOR ART
Counteracting the slag which comes out at the
end of tapping the steel from the converter, known as
the end slag, is a long-standing problem. Various
methods are known for tackling this problem.
The simplest method is to observe the flow of
steel and to stop tapping at the first appearance of
slag.
Another method is to use a spherical ball
which is introduced into the converter before tapping.
The specific gravity of the ball is such that it floats
on the steel but not on the slag. When the slag
threatens to emerge, the ball closes the opening of the
tap hole of the converter. A disadvantage of this
method, however, is that this closing frequently occurs
so early that much steel still remains behind in the
converter. This is undesirable. For this reason,
~",

i31~100
plugs are used which are not spherical, but for example
take the shape of a cube. This kind of plug does not
close the tap hole completely. The remain-ng steel may
still run out of the converter, but at a lower
velocity. At the point when slag threatens to emerge,
tapping off is stopped. The article "Ladle metallurgy
and clean steel production", S.C. McPherson, "Steel
Times", vol. 214, 1986-5 (May), page 220 etc.
illustrates such spherical and cubic plugs. EP-A-94241
describes a cubic plug for the same purpose.
When the cubic plug is positioned well, its
use provides better control because of the reduced
tapping velocity at the end of tapping. However, non-
spherical plugs of this kind require very accurate
positioning in the converter because they do not
automatically find the tap hole at the end of tapping.
This is because, in contrast to spherical plugs, their
ability to roll is insufficient. As a result the
closing of the tap hole is sometimes so poor that the
flow of end slag is insufficiently counteracted. With
non-spherical plugs, improvement in the probability of
achieving a good closing off is sought by providing
them with a long shank which is introduced into the tap
hole of the converter. This holds the plug at the
desired place so that the probability of
accurate positioning is equivalent to that of the

i3~5~0
spherical plug. However, positioning the plug with a
shank is considerably harder than positioning the
spherical plug.
SUMMARY OF THE INVENTION
The object of the invention is to provide a
plug which avoids the defects of the spherical plug and
the cubic plugs described above, as well as those of
the plugs with a shank. The plug of the invention is
of the shankless type and has a polyhedral shape with
a plurality of generally flat faces. Each face joins
at least one adjacent face at an obtuse angle. In some
embodiments at least one end point of each intersecting
line of two ad~acent faces lies on an imaginary sphere
enveloping the plug. This plug does not close the tap
hole completely so that towards the end of tapping the
flow of steel is reduced but not completely blocked.
Moreover, this plug has sufficient ability to roll so
that it does not need to be provided with a shank for
positioning at the tap hole. As a result using the
plug in accordance with the invention is as simple as
using the known spherical plug.
A preferred shape of the plug is one in which
it has symmetrical upper and lower halves meeting at a
common plane which has a larger area than any parallel
sections of the upper and lower halves. The plug then
fits releasably in the mould in which it is cast and

13~51~0
can be removed from it without its shape being lost.
In view of the large number of plugs needed in practice
(per converter charge one plug is consumed), this
represents an important cost advantage.
In practice a simple embodiment has been found
to be a plug of which the common plane between the
lower and upper halves has essentially a rectangular
e.g. square shape. It is particularly desirable that
the plug has a top plane and a base plane which are
parallel to the said common plane of the lower and
upper halves.
BRIEF INTRODUCTION OF THE DRAWINGS
Embodiments of the invention will be described
by way of non-limitat~ve example with reference to the
drawings, in which:-
Fig. 1 shows a first embodiment of the plug inaccordance with the invention; and
Fig. 2 shows a further embodiment of the plug
in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The plugs shown in Figs. 1 and 2 consist
essentially of refractory material of appropriate
density to float at the steel slag interface. This may
be for example a suitable type of refractory concrete.
Fig. 1 shows an embodiment in which the plug
has fourteen flat faces, of which six large faces 5

131~100
intersect each other at 90 and eight small triangular
faces 6 form bevels at the corners. There are thus
twenty four angles, each angle being the meeting point
for three intersecting meeting lines of the faces. For
example angle l is formed by the intersecting lines 2,3
and 4. The plug may be lifted or tippe.d into a
converter using an eye 7. Each of the faces 6
intersects each of the three adjacent larger faces 5 at
an obtuse angle. The shape of the plug enables it to
roll easily to lodge in the taphole of the steel
converter.
Fig. 2 shows a further lmproved plug with
edges bevelled off more. The shape of this plug
redices the risk of the angles crumbling away and
improves its ability to roll.
In this case the plug is a body of polyhedral
shape having a rectangular central plane of symmetry 10
and mutually symmetrical upper and lower halves 8,9 on
each side of this central plane. Each half 8,9 has
four large planar faces 8a,9a meeting the central
plane of symmetry lO and extending away from it at an
angle less than 90, specifically 75 and a planar end
face 11,12 meeting all the first planar faces 8a,9a and
lying parallel to the central plane of symmetry lO. At
each meeting point of two of the first planar faces
8a,9a and one of the second planar faces 11,12 there is

1315100
a small bevel face 13 at an obtuse angle to all three
adjoining faces. There are rounded surfaces 14 at
meeting zones of each adjacent pair of the first planar
faces 8a,9a.
Both the lower half 8 and the upper half 9
have a tapering shape. This has the advantage that the
mould or die which is used for making the plug may be
re-used. This reduces the production costs of the plug
to a significant degree.
To give an example of dimensions, the plugs
illustrated are each 205 mm high and have maximum
widths of 205 mm.

Dessin représentatif

Désolé, le dessin représentatif concernant le document de brevet no 1315100 est introuvable.

États administratifs

2024-08-01 : Dans le cadre de la transition vers les Brevets de nouvelle génération (BNG), la base de données sur les brevets canadiens (BDBC) contient désormais un Historique d'événement plus détaillé, qui reproduit le Journal des événements de notre nouvelle solution interne.

Veuillez noter que les événements débutant par « Inactive : » se réfèrent à des événements qui ne sont plus utilisés dans notre nouvelle solution interne.

Pour une meilleure compréhension de l'état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , Historique d'événement , Taxes périodiques et Historique des paiements devraient être consultées.

Historique d'événement

Description Date
Inactive : CIB de MCD 2006-03-11
Inactive : Demande ad hoc documentée 1996-03-30
Le délai pour l'annulation est expiré 1995-10-01
Lettre envoyée 1995-03-30
Accordé par délivrance 1993-03-30

Historique d'abandonnement

Il n'y a pas d'historique d'abandonnement

Titulaires au dossier

Les titulaires actuels et antérieures au dossier sont affichés en ordre alphabétique.

Titulaires actuels au dossier
S.O.
Titulaires antérieures au dossier
JOZEF G. M. TRENTELMAN
Les propriétaires antérieurs qui ne figurent pas dans la liste des « Propriétaires au dossier » apparaîtront dans d'autres documents au dossier.
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Description du
Document 
Date
(yyyy-mm-dd) 
Nombre de pages   Taille de l'image (Ko) 
Page couverture 1993-11-09 1 12
Abrégé 1993-11-09 1 18
Revendications 1993-11-09 2 59
Dessins 1993-11-09 2 22
Description 1993-11-09 6 158
Demande de l'examinateur 1992-02-05 1 59
Correspondance de la poursuite 1992-05-12 9 392
Demande de l'examinateur 1992-06-24 1 61
Correspondance de la poursuite 1992-09-03 2 76
Correspondance reliée au PCT 1992-12-17 1 29