Dispensing – Molten metal dispensing – Flow controllers or assists
Patent
1988-02-03
1989-07-18
Kastler, Scott
Dispensing
Molten metal dispensing
Flow controllers or assists
222597, B22D 4108
Patent
active
048486043
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a slide gate valve or sliding closure unit for use at the nozzle of a vessel containing molten metal and of the type including a housing, a stationary bottom refractory plate fixedly mounted in the housing, and a sliding refractory plate that can be pressed sealingly against the bottom plate by spring means. The sliding plate is supported in an assembly that is movable along guideways of the housing between open and closed positions and that can be swung away from the housing upon release of the spring means.
As a rule, in this type of slide gate valve the movable plate assembly is guided to move in a cover secured to the housing. Thus, for example, in a slide gate valve described in DE-OS No. 21 61 368, a cover is hinged to swing out from a housing which supports a movable plate assembly for movement and which, in the operating position, is secured to the housing, preferably by four bolts.
In another slide gate valve disclosed in West German Pat. No. 32 08 101, a movable plate assembly is guided on guide ribs which are bolted to side walls of a housing. After loosening of tensioning means that press a sliding plate against a bottom plate and removal of the guide ribs, the movable plate assembly can be removed from the housing. In another modification, the housing is provided with a removable end wall, after the removal of which and the loosening of the tensioning means the movable plate assembly can be removed.
During operation, the slide gate valves are often disassembled even after one or two ladle teeming operations for maintenance purposes or for the replacement of eroded refractory plates. Therefore, in the case of the above-mentioned slide gate valves, the aforementioned bolts must each time be loosened and the movable plate assembly removed from the housing and be appropriately reassembled. Since during maintenance work such slide gate valves are generally heated to very high temperatures and become fouled, manual disassembly is relatively cumbersome. Also, the assembly must be carried out with proper care, because the adjusting bolts, which must usually be secured with a torque spanner, must be set with precision.
SUMMARY OF THE INVENTION
By contrast, the object of the present invention is to provide an improved slide gate valve of the type described above, but wherein the movable plate assembly can be loosened from the housing very simply and in a time-saving manner for the very frequent replacement of the refractory plates and refractory nozzles and similarly can be brought back into operating condition after exchange of the refractories.
In accordance with the invention, this object is achieved by providing a movable plate assembly that can be moved into a position that lies outside of or is beyond the normal closed position and at which the movable plate assembly is swingably mounted about a bearing to the housing. At such position guideways supporting the assemblies are lowered by a height sufficient to release the tension of spring means.
With this novel construction of the slide gate valve embodying the invention, the assembly with the sliding plate mounted therein is released from the pressure of the spring means merely by sliding the assembly to the above-mentioned position. Therefore, the slide gate valve can be disassembled in extremely simple fashion by moving the assembly into the above-mentioned position and then swiveling the same out of the housing. Conversely, in order to mount the assembly, it is swung back into the housing, after which it is moved back to the closed position. Thereby, the pressure of the spring means is automatically re-established accurately without having to carry out additional operations on the slide gate valve.
To achieve a continuous and non-jerky tensioning or unstressing of the movable plate assembly housing, the guideways in the area of transition to the above-mentioned position are constructed as inclined planes.
Provision is made by the invention that the movable plate assembly is in the
REFERENCES:
patent: 3856189 (1974-12-01), Meier
patent: 3921866 (1975-11-01), Palazzo
patent: 4187965 (1980-12-01), Aliprandi et al.
patent: 4660749 (1987-04-01), Yokoi et al.
patent: 4717127 (1988-01-01), Toxler
Kastler Scott
Stopinc Aktiengesellschaft
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