US3104655A - Open hearth furnace door - Google Patents

Description

Sept 24 1963 M. BLACKR v 3,104,655

OPEN HEARTH FURNACE DOOR Original Filed Dec.` 19, 1956 TST E- /NVE/VTOH MERRILL S. BLC/(ER his Alorney. f

United States Patent M'ce 3,104,655 OPEN HEARTH FURNACE DR Merrill S. Blaclier, Antioch, Calif., assigner to United States Steel Corporation, a corporation of New Jersey Continuation of application Ser. No. 629,393, Dec. 19, 1956. This application .lune 18, 1958, Ser. No.

1 Claim. (Cl. 122-498) This invention relates to refractory lined door for furnaces or the like.

The present application is a continuation of my earlier copending application Serial No. 629,398, tiled December 19, 1956, now abandoned.

The invention is especially applicable to doors for open hearth furnaces used in steelmaking, although obviously it may have other application where similar problems are encountered. Concentionally an open hearth door includes a rectangular water-cooled shell whose inner face carries a refractory lining, either of brickwork or monolithic. The present invention concerns an improved means for anchoring a monolithic lining to a door shell. Anchoring means presently in use commonly include metal studs which are fixed to the back face of the door shell, either permanently or detachably, and extend into the refractory. After relatively short service the intense heat `of the furnace erodes the refractory and exposes portions of the studs, so that frequent replacement is necessary. Previous anchoring means with which I am familiar have been diflicult to remove and replace when no longer serviceable. Even when studs purposely are made detachable, their mountings become clogged with refractory, making detachment exceedingly difficult.

An object of the present invention is to provide improved achoring means which are of simplified construction and easily removed and replaced when necessary.

A more specific object is to provide improved anchoring means which include a series of plates lightly welded to the back of a door shell and extending into the refractory, said plates being readily broken away for easy replacement.

In accomplishing these `and other objects of the invention, I have provided improved details of structure, a preferred form of which is shown yin the accompanying drawing, in which:

FIGURE 1 is a rear elevational view of a water-cooled refractory lined door equipped with anchoring means in accordance with my invention, a portion of the lining being broken away to show the anchoring means more clearly;

FIGURE 2 is a vertical section on line II-II of FIG- URE 1; and

FIGURE 3 is a horizontal section on line III-III of FIGURE 1.

The drawing shows a door which includes a rectangular water-cooled metal shell and a monolithic refractory lining 12. The shell and lining, apart from the novel ianchoring means, are conventional; hence no detailed description is deemed necessary. The shell illustrated includes intermediate vertically extending channels 13 and contains a wicket opening 14, but these parts yare optional and my anchoring means can be applied to doors of various Iother constructions.

In accordance with my invention, the anchoring means 3,104,655 Patented Sept. 24, 1963 for the refractory lining 12 includes a plurality of relatively long, parallel metal strips or plates 15 tack-welded to the inner face of the shell. The lines of attachment of the plates to the shell extend horizontally and preferably the plates slope upwardly from these lines. Welding beads 16 are applied only to the upper faces of the plates and in sufficient number to hold Ithe plates securely. The inner edges of the plates can be notched, as indicated at 17, to clear any protuberance on the shell, such as the channels 13, or the plates` can be omitted over the Wick-et 14. The refractory lining is rammed into place `over the plates 15 which furnish the necessary anchorage for holding this lining on the door shell.

By virtue of their length plates 15 are of greater crosssectional area than conventional studs or pins, and as shown in FIGURE 2, they extend substantially to the exposed face of the lining. As a result, they conduct more heat to the metal face of the door shell than studs or pins lof similar metal would conduct. The water-cooling action of the door dissipates and carries away more heat, and thus prolongs the door life.

When it becomes necessary to replace the lining, the v refractory is cleared away in the usual manner. Any of the plates 15 which are no longer serviceable then yare removed and replaced. These plates can be broken away readily with a hammer, since the single welding beads form easy lines of cleavage. It is then a simple operation to weld new plates to :the door shell as needed. Thereafter a new refractory lining can be rammed in place in the usual manner. Thus the replacement operation is greatly simplified over that required when the anchoring means cannot be removed as readily.

While I have shown and described only a single ernbodiment of my invention, it is apparent that modifications may arise. Therefore, I do not wish to be limited to the disclosure set forth but only by vthe scope of the appended claim.

I claim:

In a furnace door which includes a water-cooled shell having intermediate vertically extending channels on its inner face and a monolithic refractory lining rammed in place on the inner face of said shell, the combination therewith of anchoring means for said lining comprising a plurality of relatively long metal plates xed toy the inner face of said shell and extending into said lining and being notched to clear said channels, the lines of attachment of said plates being horizontal, said plates sloping upwardly from their lines of attachment and being fixed -to the shell by welding beads located on the upper face only `of each plate and forming easy lines of cleavage to enable the plates readily to be broken away for replacement, said plates extending substantially to the exposed face of said lining and being of relatively large crosssectional area by virtue of their length to conduct heat to said shell.

References Cited in the file of this patent UNITED STATES PATENTS y1,120,835 McMurray et al Dec. 15, 1914 2,426,568 Sontz Aug. 26, 1947 2,705,477 Braun Apr, 5, 1955

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