US827813A - Rotary heating-furnace. - Google Patents

Description

PATENTED AUG. 7, 1906.

3. McGAFF. ROTARY HEATING FURNACE.

APPLIOATION FILED APR- 13, 1906- Que 0 00006 n o 0 R42 o oooooo ooooo Pb 00000000000 H n u n H h JNVENTOR.

' WITNESSES:

JOHNt/IcGAFF, or TOLEDO, OHIO.-.

ROTARY HEATBNG FURNACE,

Specification of Letters Patent.

Iatented Aug. "4'', 1906 Kpplioation filed April 13,1906; Serial No, 311.498.

To H whom, it nwiy concern:

Be it known that I, JOHN MCGAFF, a citizen 0f the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Im rovements in Rotary Heating-Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it app'ertains to make and use the same, reference being had to the accompanying drawings, and tothe figures of reference marked thereon, which form a part of this specification.

My invention relates to furnaces for the working of all kinds of iron or steel scra s,

i and particularly to flame-furnaces or t e kind'in which the work is not embedded or mixed with the fuel, but is subjected to the flame and heat arising therefrom.

The object of my invention is to sim lif and cheapen the initialheating and wor ring of such metals into balls by the provision, in combination with the combustion-chamber, of a rotary heating-chamber which is, so shaped as to cause the metal therein to be continuouslv puddled or Worked into a ball during the eating thereof and the slag and ein'ders segregated therefrom, thus obviating the skilled labor heretofore necessary to puddle or work the metal into balls.

The construction, operation, and arrangement of the parts of my invention are fully described in the following specification, and illustrated in the accompanying drawings, in which Figure 1 is a plan View, and Fig. 2 a central longitudinal vertical section, of the furnace embodying my invention.

Referring to the drawings, 1 represents the fuel or combustion chamber, 2 the rotary with the usual bridge 5, over which the flames and highly-heated gases from the burning fuel are required to pass to enter the heatingchamber.

The heating drum or chamber 2 is of cylindrioal form and has its ends contracted, as shown, to form the restricted entrance and exit passages 6 and 7, respectively, and the intermediate annularlybulged portion 8,

which forms a trough in which the metal is worked. The exit end 7 of this drum communicates with the chimney fiue through a w suitable opening Qtherein, while the entrance end thereof is flared or tapered outwardly to form a conical mouth which abuts against the inner end of the fuel-chamber with its in ner upper edge coinciding with the corresponding edge of said fuel-chamber and has t e radius of its rim substantiaily that of the are described by the arch of the fuel-chamber roof at such point. The drum 2 is shown as being formed of an outer casing of sheet metal having an inner lining of fire-brick, fire-clay, or the like. A door or doorslO are positioned at one side of the bulged portion of this drum to close an opening therein through which the'metal is inserted or with drawn. A plurality of openings 11 are If vided through the casingof the bulged p.

.tion of the drum 2 for the drainage of slag and cinders therefrom. These also form windo'ws through which the metal within the chamber may beinspected.

v The drum is supported at its ends in proper position between the fuelchamber 1 and stack 3 by the supports 12 12, carrying thegrooved segmental stirrups or members 13 13 in which the annular ledges or shoulders 14- 14 at the ends of the heating-chamber rotatably rest, as shown.

A sprocket-wheel 15 is mounted on the re duced end '7 of the drum 2 and meshes witha drive-chain. 16, by means of which a rotary movement is communicated to said drum, or it may be driven in any other suitable manner.

The operation of my invention is as follows: The scrap metal being deposited in the drum 2 through the door-opening therein, the door 10 is then closed and the rotation of the drum started. The flames and heated gases arising from the fuel in the coinbustion-chaniher 1 pass over the bridge 5 therein and impinge against the upper inwardly and downwardly inclined surface of the conical mouth (5 of the heating drum or chamber 3 and are caused thereby to take a downward course and be concentrated upon the work in the lower portion of the trough S. The rotary movement of the drum causes the metal to be kept continually turning over, so that all sides thereof a re acted, upon by the heat, and us the mass of metal approaches a welding heat causes it to he rolled into a ball, as shown at .17, thus effecting a quicker and ignore solid mass than is more even heating of the mass of metal than would otherwise be the case and causing it,

no to its weight, to becompressed into a possible by hand. The cinders and slag which become separated 'from the rolling mass during the heating proc ess drop throu h the openings 11 in the drum to the floor. n the working of some classes of n1etalsuch, for instance, as pig-iron it is preferable to plug the openings 11 and to draw proper intervals. When the mass has been heated androlled to the desired state, the ro-' tation of the drum is stopped, the door opened at the under side thereof, and the ball allowed to drop out.

I wish it understood that I do not desire to be limited to the exact details of construc tion shown and described, for obvious modiperson skilled in the the ci'nders and slag from the drum at.

to secure by Let and communicating l l i l l I I l l y i i estate tary heating-chambe tracted to form an. intei .im tion and its entrance end the side of the fuel-she tion with its exit and h; coinciding with the inner and substantially describii the roof is an arc.

3. A furnace having in om chamber and a horizontai drum communicating at one exit of the fuel-chai'nber and a with a chimney, said drum he bulged intermediate its ends to ternal trough and having such bu provided with a door and drama substantially as described.

4 The combination with t her, of a horizontally-disposcd drical heating-ch amber having 5 1 t ing therethrough, its entrance flared mouth whereby the flame upper surface thereof are ah wardly, and its intermediate po rically expanded to form a tra 1 drainitgeppenings through its a In testimony whereof i, signed my name to this specific l presence of two subscribing; wi

T i T Witnesses:

C. W. OWEN, HAZEL B. HIETT.

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