Sliding gate

Details Sliding gate Sliding gate

1997-08-20

1998-10-06

Kastler, Scott

Dispensing

Molten metal dispensing

Flow controllers or assists

B22D 4108

Patent

active

058172467

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to a sliding gate valve comprising a chamber, a stationary refractory plate and a sliding refractory plate movable in relation to said stationary plate, said sliding plate being supported within a slide frame that is movable in relation to the chamber, said sliding plate being pressed by means of spring elements against the stationary plate.
Sliding valves of this type are well known. Reference is made, purely for example, to U.S. Pat. No. 4,063,668.


BACKGROUND ART

In this regard, FIG. 5, shows a longitudinal section of part of a conventional slide gate valve for ladles. This pouring ladle valve is characterized by a mounting plate 1 attached to the lower side of the casting vessel which is not explained in any further detail, an interchangeable ring 34 of a refractory within said mounting plate, a sliding chamber 2 , a slide frame 5 as well as a stationary refractory top plate 39 and a sliding refractory valve plate 40 that is movable in relation to said stationary top plate. The sliding chamber 2 is contained by side walls 6 and a floor plate 3 . The slide frame 5 comprises a plate 8 extending parallel to the sliding valve plate 40 and having sleeve-like insert pockets 9 for the insertion of thermodynamic spring elements 10 which are supported on the one hand by the lower side of the sliding valve plate 40 and on the other hand by the floor plate 4 of the slide frame 5 with sufficient pressure of the sliding valve plate 40 against the top plate 39 . On the sliding-plate-side of the floor plate 4 of the slide frame 5, the spring elements 10 are provided with pot-like recesses 12 into which an axial continuation of spring elements 10 can extend. Spring elements 10 are supported on the upper edge of the recesses 12 by means of a supporting plate 13.
The supporting plate can be swung round together with the chamber 2 and the slide frame 5 opposite to the top plate 39. The lock attachment associated with this swinging mechanism is marked as no. 11 in FIG. 5.
A heat insulating shield 7 also extends below the chamber 2.
The slide frame 5 is arranged within the chamber 2 so as to allow for longitudinal movement. For this purpose the floor plate 3 of the chamber 2 includes ribbon-like slide rails 14 on the inside, while the floor plate 4 of the slide frame 5 has also ribbon-like slide rails 15 on the outside or its lower side. These two slide rails 14, 15 also define a narrow gap 16 between the lower side of the floor plate 4 of the slide frame 5 and the inner or upper side of the floor plate 3 of the chamber 2.
Practical use has shown that the refractory, in particular that of the sliding valve plate, leaks tar constituents during operation which drop down within the slide frame and the chamber. This causes the pockets 9 for the insertion of the thermodynamic spring elements 10 to clog up. The slide surfaces defined by the slide rails 14, 15 also become clogged. The slide rails 14, 15 are normally made of bronze. The tar is deposited here and causes the slide surfaces to become sticky. As a result, the slide frame 5 can no longer be moved back and forth smoothly. The sliding gate valve thereby loses its precision with extended operation.


DISCLOSURE OF THE INVENTION

One aspect of this invention is the fact that the slide surfaces are located outside of the area that is susceptible to clogging. This ensures continuous and precise operation.
Preferably the slide frame is designed in one piece, wherein the floor defines a type of segment grid. This makes it unnecessary to have a separate floor plate for the slide frame as well as for the chamber. Due to the floor apertures formed by the segment grid, the tar originating at the sliding valve plate can drop below without clogging any sliding parts, in particular displaced parts. The same is true if the floor is defined by the supporting segments or plates associated with the spring elements, but otherwise has the same open design.
A second aspect of the invention is that the spring elements may be easily inserted and remove

REFERENCES:
patent: 4921148 (1990-05-01), Muller
patent: 5151201 (1992-09-01), Fishler et al.
patent: 5518154 (1996-05-01), Vassilicos et al.

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