Note: Descriptions are shown in the official language in which they were submitted.
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The invention relates to a refraetory plate of
rounded-oblong or oval design and having a shrunk-on ring applied
to its peripheral area to clamp the refrac-tory plate into a
metallie frame of a sliding gate at the outlet of a metallurgical
vessel.
In sueh a plate as described in German Patent
33 45 539 which has slide faces on both sides and which in the
event of one slide face being worn can be turned over to increase
the serviee life, the shrunk-on ring holds together the refractory
material in such a way that, despite the thermal stress cracks
which occur at first use as a result of thermal stresses, the
seeond slide faee can still be used. The relatively long, straight
longitudinal faees at the plate periphery however, proved to be
weak points at which the shrunk-on ring seldom fits snugly, which
promotes cracking. Clamping forces of the elamping means for
fixedly seeuring the plate in its metallie frame are effected at
random and in eoneentrated fashion, whieh also have a similarly
destruetive effeet.
In addition, an ellipse-like plate itself is known
from German 'Offenlegungssehrift' 35 22 135, whieh is uneonstrain-
edly supported with play in the metallie frame of the gate. In
other respects, the plate has a wedge faee at the periphery for
the mechanieal elamping of a composite, eorrespondingly eounter-
wedged, elamping ring, whieh is intended to eounteract thermal
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stresses in the plate material. It is disadvantageous that the
relatively rigid clamping ring on the contact surface to the plate
creates point loads which prematurely destroy the refractory
structure.
The invention provides a refractory plate having a
shrunk-on ring applied to the periphery thereof to clamp the
refractory pla-te in use into a metallic frame of a sliding gate at
the outle-t of metallurgical vessels, wherein the peripheral area
of the plate is generally elliptical and has, a-t least on one
transverse head side, a clamping face provided transversely to a
main axis of the ellipse of the plate, which clamping face
receives the clamping force. This outer shape of the plate,
having a specific clamping face at the otherwise continuously
rounded circumference, permits the snug adhesion of the shrunk-on
ring to the longitudinal sides of the plate during uniform
complete application in the region of the clamping face, thus
resulting in an improved cohesion of the plate structure and,
therefore, an extended service life of the plate. This effect is
additionally strengthened in that clamping forces absorbed by the
specific clamping face are transmitted, substantially uniformly
dis-tributed, through the plate structure to the frame side lying
opposite the clamping face and acting as abu-tment which, again,
protects the plate structure against destructive cracking as the
resul-t of load peaks.
Preferably the plate is of symmetrical design opposing
faces being arranged parallel to each other at both transverse
head sides of the plate, one of these faces acts as abutment face
relative to the plate frame. To this end, the two faces are
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perpendicular to the main axis of the plate. This construction is
simple and particularly advantageous in respect of the stress
imposed on the plate.
A further proposal according to the invention provides
that the large radii of a comparable ellipse are the two- to three-
times the width of the plate. As a result thereof/ it is possible
to maintain at a minimum the refractory volume and, therefore, to
reduce the manufacturing costs of the plate.
The invention is described hereinafter by way of an
exemplified embodiment with reference to the drawings, wherein:
Figure l shows in plan view a reEractory plate according
to the invention, clamped into an adjustable linear slide frame,
and
Figure 2 shows a longitudinal section of the plate
removed from the frame.
In the drawing, reference numeral l refers to the
metallic slide frame of a sliding gate used on metallurgical
vessels. In the frame 1, which can be adjusted in the
longitudinal direction via a connecting rod which may be connected
at 2, the
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oval or ellipse-shaped refractory slide plate 3 is clamped,
which plate 3 has a flow opening 4, although two flow openings may
be provided, and co-operates in the usual manner with an identical
stationary plate (not shown) in order -to control the vessel out-
let in its function as a seal. Each of the identical plates 3,
designed as an oval or an ellipse with a main axis 5, according
to Figure 1, is provided at its circumference with a shrunk-on
ring 6 which is narrower than the plate thickness, and may be
turned over by shaping both sides of the plate as slide faces.
In par-ticular, a special clamping face 7 is provided at the
transverse head side of the plate 3 to make up the clamping force
of a clamping device 8, the clamping jaw 9 of which is in guiding
connection with a wedge part 11 which is arranged on a threaded
bolt 10, said clamping jaw 9 being pivotally supported on the
frame 1. The clamping jaw 9 can be moved towards or away from
the clamping face 7 by appropriate turning of the threaded bolt 10
through the driving profile 12.
A further face 13 which is similar to the clamping
face 7 is provided at the other transverse head side of the plate
3. Faces 7 and 13 are arranged parallel to each other, and
relative to the extension of the main axis 5, transverse,
especially perpendicular to main axis 5, although slight de-
viations from the perpendicular may be structurally expedient.
In any event, the clamped plate 3 is supported via the face 13
relative to the frame 1 which has an appropriately designed
counter-profiled face or, alternatively, a second clamping device
8.
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The plate 3 is supported on the base 14 of the frame
and is detachably carried circumferentially on borders 16 of the
frame, with the result that replacing or turning-over of the
plate 3 is easily done when the clamping device 8 is open. In
addition, the plate 3 can be clamped in the frame 1 reliably and
in stress-free manner in view of its particular configuration.
