Dispensing – Molten metal dispensing – Flow controllers or assists
Patent
1996-09-26
1998-06-30
Kastler, Scott
Dispensing
Molten metal dispensing
Flow controllers or assists
222606, 222607, B22D 4150
Patent
active
057729085
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for controlling the flow of liquid steel between a ladle and a continuous casting distributor which can contain a liquid steel bath, said ladle being able to contain and transport a liquid steel quantity between a remote site and a continuous casting platform, said ladle having a casting hole making it possible to transfer the liquid steel into the distributor, said casting hole being surrounded by an upper, fixed plate, the device comprising a frame connected to the ladle and having guidance means, a plate displaceable on the guidance means and able to seal the casting hole, said device also including means for pressurizing said plate, means for protecting the liquid steel jet during its passage from the ladle to the distributor, said means in particular incorporating a jet protection tube to be placed in the extension of the casting hole and which has a lower end to be immersed in the liquid steel bath contained in the distributor.
It also relates to a process for controlling the flow of liquid steel between a pocket and a continuous casting distributor able to contain a liquid steel bath, said ladle being able to contain and transport a liquid steel quantity between a remote site and a continuous casting platform, said ladle having a casting hole permitting the transfer of the liquid steel into the distributor, said casting hole being surrounded by an upper, fixed plate.
According to the prior art, the ladle generally has a blanking cover or obturator equipped with a slide valve able to receive in general two refractory plates, each having an orifice, one of the said plates (the upper plate) being fixed. It is connected to an internal nozzle placed in the ladle casting hole. The other plate (the lower plate) is mobile with respect to the fixed plate. When the orifice of the fixed plate and that of the mobile plate are displaced, the casting hole is completely closed. When the orifices of the refractory plates overlap to a greater or lesser extent, the steel flow is constricted, which makes it possible to regulate its discharge. An example of such a device is described in European patent EP 202 213.
At the start of a casting sequence the ladle is empty. It is equipped with a slide valve, which is closed. The ladle is then filled with steel and, after various treatment operations, it is transported on the continuous casting platform. A current practice consists of placing the full ladle on a wheel, which performs a rotation by a half-turn to bring the ladle above the distributor.
Moreover, existing requirements concerning steel quality make it ever more frequently necessary to protect the steel jet against any contact with the air between the ladle and the distributor in order to prevent its oxidation. One currently used method consists of extending the ladle casting hole by a jet protection tube made from a refractory material. The end of this tube is immersed in the steel bath contained in the distributor, so as to ensure a tight channel between the ladle and the distributor. This jet protection tube is generally mounted on a nozzle, known as the collecting nozzle, which is integral with the mobile plate of the slide valve-equipped blanking cover of the ladle.
The jet protection tube must generally be placed on the casting location, i.e. when the ladle is placed above the continuous casting distributor. It is rarely possible to equip the ladle with the jet protection tube prior to its being brought to the casting location, because existing plants and workshops generally do not have an adequate space beneath the ladle for housing such a tube on the equipments where the ladle is to stay or be transported prior to casting, e.g. the furnace, ladle treatment and transfer trolleys.
Thus, there are three functions which must be ensured for the transfer of the liquid steel from the ladle to the distributor: also, for safety reasons, in the case of an incident or accident occurring during casting operations, within the distributor can be kept at the desired height,
At pr
REFERENCES:
patent: 4290589 (1981-09-01), Luhrsen et al.
patent: 5358551 (1994-10-01), Saylor
patent: 5494201 (1996-02-01), Szadkowski
Kastler Scott
Vesuvius France S.A.
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