Dispensing – Molten metal dispensing – With subjacent flow guide
Reexamination Certificate
1999-09-14
2001-04-10
Kastler, Scott (Department: 1742)
Dispensing
Molten metal dispensing
With subjacent flow guide
C222S606000
Reexamination Certificate
active
06213357
ABSTRACT:
The invention relates to continuous hot casting installations which serve in particular for making raw steel products.
An essential element of such an installation is the casting member which is known as an immersed nozzle. Mounted on a metallurgical or casting container, it ensures good distribution of the flow of liquid metal, which must ultimately abut against a continuous casting channel, where a cooling and progressive solidification of the liquid metal take place. All the components in contact with the metal at a high temperature are naturally made of refractory material. They are likewise subject to wear or blockage, in particular the nozzle, which has to be changed periodically in order to prolong the casting cycle.
Furthermore the close presence of the hot metal creates a very difficult environment for all the systems which are provided. All handling is delicate in this region. The zones in question are also congested and often tight. The metallurgical containers and the distributors of the continuous casting in particular are often provided with feet or reinforcements on their bases.
In European patent EP-B-0 441 927, the applicants have proposed a device for plugging and controlling continuous hot casting designed to be mounted on a metallurgical or casting container of the type comprising, on a framework, a plugging assembly, a channel providing a casting tube known as an immersed nozzle, adjacent to the outlet of the plug, spring thrusters to maintain this nozzle in an operative position in line with the plug assembly, on the feed channel, which is designed to receive another nozzle in a position of readiness, and an offset ram traverser provided with an arm for engaging the nozzles, all supported on a cam track.
It would seem difficult to improve on it, in particular to make it more compact. However the present invention aims to improve these items still further.
According to one important aspect of the invention the body of the ram is provided with a sensor designed to co-operate with the cam track and it also supports the driving arm, whereas the rod of the ram is fixed to the structure. This allows a reduction in the dimensional bulk of the device.
Preferably the ram is retracted while a nozzle is in operation, whereas it is extended for displacing the nozzles by pushing on them.
REFERENCES:
patent: 4669528 (1987-06-01), Szadkowski
patent: 4854488 (1989-08-01), Trenkle et al.
patent: 5170915 (1992-12-01), Szadkowski
patent: 5351865 (1994-10-01), Szadkowski et al.
patent: 0441927 B1 (1990-08-01), None
Kastler Scott
Vesuvius Group SA
Williams James R.
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