Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – With means to discharge molten material
Patent
1990-11-08
1992-10-13
Kastler, Scott
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
With means to discharge molten material
222597, 222598, B22D 4124
Patent
active
051548755
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a slide gate nozzle or shut-off control valve to be mounted in a wall or lining of a vessel containing, in particular, molten metal and including at least two refractory shut-off parts that are provided with passages or openings, that project into the vessel interior and that have respective sliding surfaces that can be displaced sealingly relative to one another. The invention also relates to refractory shut-off parts for such nozzle or valve.
A final control supply element of the above described category is disclosed in German DE-P 35 40 202 and substantially comprises two concentric tubes or pipes that project into the vessel, that can be moved therein relative to one another and that have openings through which the melt passes. The openings of the pipes can be brought more or less into alignment or coincidence by means of axial lifting movement and/or rotary movement. Thus, it is possible to correspondingly regulate the volume of molten metal discharge. The two refractory pipes must be machined quite accurately in the surface regions thereof that are in contact with each other in order to obtain an absolute seal. The machining of these cylindrical rotational surfaces is, therefore, relatively time-consuming. In addition, the risk of breaking the pipes off during assembly and also during operation is relatively high due to possible generation cross forces.
SUMMARY OF THE INVENTION
The object of the present invention is to further develop a slide gate nozzle or shut-off control valve of the aforementioned type in such a manner that its shut-off parts can be manufactured in a simpler manner and thus more cost effectively, and in addition to obtain a higher operational reliability.
This object is achieved in accordance with the invention in that each shut-off part within the vessel has at least one approximately planar sliding surface. The two shut-off parts can be displaced sealingly relative to one another at such planar surfaces in order to open or close passages of openings through the parts. The planar sliding surfaces can be manufactured in a simple manner and guarantee optimal operational reliability.
In an advantageous embodiment of the invention, one shut-off part is mounted stationarily in the vessel and the other, part is displaceable within the vessel. Both shut-off parts can be provided with one or two parallel sliding surfaces.
In a variant, the stationary shut-off part has a recess within which is received a plate to open or close the discharge openings.
The invention also is quite suitable for thin slab casting wherein the passages or openings are designed in the shape of elongated slots.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments and other advantages of the invention are explained in detail, with reference to the accompanying drawings, in the following description:
FIG. 1 is an axial sectional view of a slide gate or shut-off nozzle according to the invention;
FIG. 2 is a transverse cross-sectional view of the slide gate nozzle according to FIG. 1, the upper half of FIG. 2 being taken at an axial position through a lateral passage and the bottom half of FIG. 2 being taken at a position below such passage;
FIG. 3 is a perspective view, in axial section embodiment of the invention;
FIG. 4 is an elevational view of the slide gate nozzle of FIG. 3 and a drive unit therefor mounted on a vessel;
FIG. 5 is a partial section taken along line V-V of FIG. 4;
FIG. 6 is an axial sectional view of another embodiment of the invention;
FIG. 7 is a view taken along line VII--VII of FIG. 6; and
FIG. 8 is a perspective view, in transverse section an embodiment with slotted passages.
DETAILED DESCRIPTION OF INVENTION
FIG. 1 shows a slide gate nozzle or shut-off valve 10, arranged in a lining 13 of a vessel 12 to contain molten metal or a distributor for use in a continuous casting installation. Shut-off valve 10 substantially comprises a stationary refractory shut-off part 11 and a moveable refractory shut-off part 15 guided for movement axial
REFERENCES:
patent: 2575464 (1951-11-01), Olsen
patent: 4632283 (1986-12-01), Arakawa et al.
patent: 4747580 (1988-05-01), Tinnes et al.
patent: 4759479 (1988-07-01), Tinnes
patent: 4949886 (1990-08-01), Luhrsen et al.
Kastler Scott
Stopinc Aktiengesellschaft
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