Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Reexamination Certificate
2000-06-08
2001-10-23
Lu, Jiping (Department: 3749)
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
C414S154000
Reexamination Certificate
active
06305931
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention refers to furnaces for the treatment of minerals or oxidized materials, and in particular refers to furnaces of the rotary hearth type.
BACKGROUND OF THE INVENTION
In such a way area called the furnaces including a toroidal chamber with the bottom wall rotating as to the rest of the chamber, the so said rotating hearth, being positioned several burners on the side walls and the ceiling wall of the furnace. The hearth, made of a thick layer of refractory material, is normally supported by a frame on which can be assembled the wheels cooperating with suitable tracks; alternatively, the frame has the circular tracks for the sliding and/or driving wheels of the hearth itself, placed on the ground.
The positioning on the ground of said wheels offers many advantages both from a practical point of view, such as the plant embodiment more easiness and the better maintenance possibilities, and from an economical point of view, bound substantially to the construction simplifications. Nevertheless, this kind of solution subjects the hearth refrac-tory material layer to considerable stresses, which can cause even substantial damages.
SUMMARY OF THE INVENTION
Object of the present invention is then to embody a rotary hearth furnace where the hearth sliding and/or driving wheels can be placed on the ground without producing, for this reason, damages to the integrity of the refractory material layer forming the hearth itself.
Object of the present invention is then a rotary hearth furnace for the treatment of minerals or oxidized materials including a toroidal chamber with the bottom wall, said hearth, rotating as to the rest of the chamber, said hearth including a refractory material layer supported on a frame which includes the tracks cooperating with the wheels, placed on the ground, for the sliding and/or driving of said hearth; characterized in that said frame includes several girts radial as to said hearth, angularly equidistant from each other, and at least two circular sliding girders, positioned next to the outer and inner peripheral edge of said hearth, being said sliding girders in contact with the hearth sliding and/or driving wheels and being said wheels angularly equidistant from each other with the same angular pitch of said radial girts.
The sliding girders are made so that the de-formation which are subjected to during the rotation of the hearth is the same in spite of the different length of the span between two radial girts in the most outer circular girder and the most inner one. This result can be obtained through a different dimensioning of the girders, material being equal, or by using materials with mechanical strengths different from each other.
REFERENCES:
patent: 2879051 (1959-03-01), Buckholdt
patent: 3410543 (1968-11-01), Scharbrough
patent: 3982890 (1976-09-01), Lovell
patent: 4602904 (1986-07-01), Jeffreys
De Marchi Giovanni
Perugi Francesco
Larson & Taylor PLC
Lu Jiping
SMS Demag S.p.A.
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