Dispensing – Molten metal dispensing – With heating or cooling
Patent
1991-06-12
1993-01-12
Kastler, S.
Dispensing
Molten metal dispensing
With heating or cooling
222600, B22D 4136
Patent
active
051787806
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for closing the pouring hole of a steel-making or metallurgical receptacle such as a pouring ladle, ingot mould or continuous-casting distributor, and more particularly to a device with a moveable plate.
A conventional pouring-hole closing device is composed essentially of a plate made of refractory material which is accommodated in a metal casing fixed under the bottom of the receptacle and of a moveable plate, likewise made of refractory material, which is mounted against the fixed plate so that it can be displaced by a translational or rotational movement in order to close the pouring orifice of the fixed plate or to position a pouring orifice with which it is provided opposite the pouring orifice of the fixed plate.
When the liquid metal is poured, the stream of metal flows out through the pouring channel of the internal nozzle, made of refractory material, of the receptacle and passes through the pouring orifices in the elements, made of refractory material, of the fixed plate and of the moveable plate of the closing device. The molten metal erodes the wall of the pouring channel and causes fairly rapid wear of the wall of the pouring orifices in the refractory elements of the fixed and moveable plates owing to the high temperature of the liquid metal. In addition, owing to the temperature a decarburisation of the binder used in the manufacture of the refractory plates occurs, which leads to a deterioration of the rubbing surfaces of the two plates, which deterioration hinders the sliding of the moveable refractory plate against the fixed refractory plate during each pouring operation.
The wear of the refractory material around the pouring orifice and the deterioration of the rubbing surfaces makes it necessary to replace the refractory plates fairly regularly after a certain number of pouring operations. These replacements are obviously costly in terms of refractory material.
SUMMARY OF THE INVENTION
The object of the present invention is, on the one hand, to make these replacements less expensive and, on the other hand, to improve the sliding of the moveable plate against the fixed part.
This objective is achieved, in accordance with the invention, by means of a device for closing the pouring hole of a steel-making or metallurgical receptacle, which device is distinguished in that the fixed plate consists of a metal support plate having a plane outer surface and exhibiting a cutout in which is accommodated a wear part made of refractory material which is pierced with at least one pouring orifice, the lower face of the wear part being flush with the plane outer surface of the support plate, so that the rubbing surface of the fixed plate in contact with a moveable plate consists of a metal surface for the most part and of a refractory surface of limited extent.
In a particular embodiment, the wear part has a rim cooperating with a corresponding rim provided on the wall of the cutout.
By virtue of the invention, it is sufficient to replace the wear part alone after a certain number of pouring operations while retaining the metal support plate, which is considerably more convenient, quicker and less costly than if the entire fixed plate has to be replaced, as is the case with the conventional closing devices. The same metal support plate can thus be used for a large number of pouring operations with the simple replacement of the wear part.
Advantageously, the support plate has a cooling chamber on its inner face. In addition, the metal support plate may have a groove running along the circumference of the cutout in order to circulate a cooling fluid.
The moveable plate of the closing device according to the invention consists of a metal support plate pierced with at least one cutout in which is accommodated a wear part made of refractory material, through which at least one pouring orifice passes.
By virtue of the fact that the rubbing surface of the wear part of the moveable plate slides against a fixed surface which is for the m
REFERENCES:
patent: 311902 (1885-02-01), Lewis
patent: 3435884 (1969-04-01), Orris et al.
patent: 3685707 (1972-08-01), Shapland
patent: 4376501 (1983-03-01), Hafner et al.
Patent Abstacts of Japan, vol. 8, No. 170 (M-315)(1607) Dec. 1984.
Patent Abstracts of Japan, vol. 8, No. 170 (M-315) (1607), Aug. 7, 1984.
Kastler S.
Recherches et Developpments Dessar
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