Fireproof plate and a clamping device for a sliding gate at the

Details Fireproof plate and a clamping device for a sliding gate at the Fireproof plate and a clamping device for a sliding gate at the

1999-02-05

2000-07-25

Kastler, Scott

Dispensing

Molten metal dispensing

Flow controllers or assists

266236, B22D 4108

Patent

active

060927011

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a refractory plate for a sliding gate valve.
A refractory plate, which is not surrounded by a metallic band, is provided in a sliding gate valve as disclosed in DE-C2 35 22 134. At least two opposing regions of an edge of the plate taper towards a sliding surface. These tapering edge regions are intended for engagement with a matching, bevelled surface of a clamping element. The dimensions and angles of the plate are so selected in the region of the bevelled surfaces from the sliding surface to a rear engagement surface that the clamping elements exert a force component directed not only towards the center of the plate but also towards the rear engagement surface. The plate can have a rectangular shape with rounded corners or a hexagonal shape which is constituted by two equal sided trapeziums with a common base.
This known way of clamping refractory plates in a sliding gate valve is associated with various disadvantages. On the one hand, a number of clamping elements provided for clamping the plate are tightened individually against corresponding edge regions of the plate by means of screws or the like. This results in a disproportionate amount of work in the installation process. Furthermore, satisfactory functioning of the screws and the threaded holes in the long term is not guaranteed in the extremely rough and hot operating environment. Furthermore, the refractory plates with the bevels provided in their edge regions are relatively expensive to manufacture, and the sharp plate edges caused by these bevels can easily break away, particularly on impact.


SUMMARY OF THE INVENTION

Against this background, it is the object of the present invention to provide a refractory plate of the type referred to above, but which can be easily manufactured and has such an external shape that optimum compressive stress conditions are present in the plate in the clamped and heated operational state and that an increased service life is consequently achieved. A sliding gate valve accommodating such plates should be equipped with a clamping device with which these plates may be simply and rapidly clamped.
The object is solved in accordance with the invention by the provisions of a refractory plate having a polygonal external shape and a longitudinal axis, on both sides of which extend at least two side surfaces of different length, which are arranged at an obtuse angle (.gamma.) to one another and act as clamping surfaces of the plate in a metallic frame or the like. The shorter side surfaces are arranged to extend at an angle .alpha. of between 20.degree. and 50.degree. to the longitudinal axis, while the longer side surfaces are arranged to extend at an angle .beta. of between 10.degree. and 30.degree. to the longitudinal axis.
A clamping device is preferably provided for the clamping of the plate in the sliding gate valve and has clamping elements which, for the purpose of achieving engagement with the side surfaces of the refractory plate over their entire area, are pivotally mounted in a frame. At least two of the clamping elements are guided to be movable by a single clamping means towards the other two clamping elements.
Optimal clamping and thus an improved service life of the plate are achieved with this construction of the refractory plate in accordance with the invention and the clamping device holding the plate. The clamping of the plate is optimized by the force application produced over almost the entire length of the plate and by the pattern of lines of force acting on the plate at selected angles. Cracks produced in the plate in the operational state thus do not break up, and the sucking of air in through these cracks can be substantially prevented. As a result of the fact that the plate has no sheet metal shell, it may be fabricated economically.


BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the invention and further advantages thereof will be explained in more detail below with reference to the drawings, in which:
FIG. 1 is a plan vi

REFERENCES:
patent: 4265379 (1981-05-01), Meier
patent: 4508324 (1985-04-01), Luhrsen et al.
patent: 4573616 (1986-03-01), Shapland
patent: 4627147 (1986-12-01), Kagi
patent: 4687186 (1987-08-01), Francois-Noel
patent: 4840296 (1989-06-01), Otsuka et al.

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