Metallurgical apparatus – Means sealing or opening aperture in vessel
Patent
1993-04-19
1994-08-02
Kastler, Scott
Metallurgical apparatus
Means sealing or opening aperture in vessel
266220, B22D 100, C21C 7072
Patent
active
053338430
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention pertains to a device for installing and removing gas purging plugs for metallurgical vessels, especially for ladles, with a guide for axially displacing the gas purging plug.
A device suitable for extracting gas purging plugs, which consists of a frame attached to the bottom of the vessel, is described in DE-A1-33,30,105. A spindle, via which the force needed for the extraction can be applied, is mounted in the frame. It is disadvantageous that it is very difficult to eject the used gas purging plug because of the very cramped space conditions. Devices for inserting and extracting gas purging plugs, which consist of a lever hinged to one end of the bottom of the vessel, have been known from DE-A1,38,33,504. The gas purging plug is arranged in a hinged manner approximately in the center of the lever arm. Such devices are permanently attached to the bottom of the vessel, because they are also used as a closure for holding the gas purging plug during operation. Consequently, a separate device is needed for each site of installation of a gas purging plug. Another disadvantage of such devices is the fact that hot gases may escape from the vessel, and if these gases come into contact with a gas purging plug freshly coated with a layer of mortar, they bring about an undesired, nonuniform and excessively rapid drying. In addition, the nozzle brick is accessible with very great difficulty only for cleaning operations that may be necessary.
Exactly parallel introduction of the gas purging plug is not possible in this manner.
SUMMARY OF THE INVENTION
The task of the present invention is to avoid these disadvantages, and to provide a device that makes possible both the extraction and the insertion of gas purging plugs, wherein the gas purging plug to be inserted can be brought, on the one hand, into a position in which a layer of mortar can be applied with ease, and, on the other hand, movement exactly in the axial direction during introduction can be achieved. In addition, a position is to be provided, in which the extracted gas purging plug can easily be ejected.
The device is therefore designed according to the present invention such that hinges are provided, which permit at least two independent pivoting movements of the gas purging plug around different axes.
To extract a gas purging plug, the metallurgical vessel is usually brought into the lying position, in which the bottom of the vessel stands upright, and the axis of the gas purging plug is consequently horizontal. Exactly axial movement of the gas purging plug is guaranteed by the guide, so that the mortar is prevented from being stripped off, and a uniform joint is obtained. Another advantage of the present invention is that the nozzle brick can easily be freed from mortar residues after extraction of the gas purging plug.
If the two axes are essentially at right angles to one another, the device is attached to the vessel such that the axis of one of the hinges will be essentially vertical, so that pivoting can be performed without an essential expenditure of force, because the force of gravity does not have to be overcome. The second hinge with the essentially vertical axis is used to pivot the gas purging plug completely out of the area of the opening and to bring it into a position with the vertical axis, in which operations can easily be performed on the gas purging plug. In particular, the layer of mortar necessary for correct seating can thus easily be applied to the vertical gas purging plug.
It is favorable for the guide to contain a bar, on which a slide is slidably arranged. This permits simple and rapid displacement of the gas purging plug.
One particularly advantageous design embodiment is obtained if a first hinge permits the pivoting of the guide in relation to the vessel, and a second hinge permits pivoting of the gas purging plug in relation to the slide. The second hinge may hold rotatably on the slide a head that can be fixed by a locking means.
The insertion and the extraction of the
REFERENCES:
patent: 3190629 (1965-06-01), Draper
patent: 5007621 (1991-04-01), Rothfuss et al.
Kneis Leopold
Slamenik Manfred
A. Earley John F.
A. Earley III John F.
Kastler Scott
Veitscher-Magnesitwerke-Actien-Gesellschaft
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