US1337839A - Electrically-heated melting-furnace - Google Patents

Description

L. C. HARVEY.

ELECTRICALLY HEATED MELTI'NG FURNACE. APPLICATION FILED Nov. 1|, 1919. 1,337,839.

Patene Apr. 20, 1920.

2 SHEETS-SHEET l Wl'zesses.

L. C. HARVEY.

ELECTRICALLY HEATED MELTVIVNG FUHNACE. APPLICATION FILED Nov.1l,1919.

2 sHEETs-sHEE 2.

Patented Apr. 2), 192B.

Ves

LEONARD CHARLES HARVEY, 0F MALDEN, ENGLAND.

ELECTBICALLY-HEATED MELTING-FURNACE.

Specification of Letters Patent.

Patented-Apr. 2o, 192e.

Application filed November 11, 1919. Serial No. 337,236.

To all whom t may concerne:

Be it known that l, LEONARD CHARLES HARVEY, a subject ofthe King of Great Britain, residing at The Red House, Malden, Surrey, England, have invented new and useful Improvements in ElectricallyHeated Melting-liurnaces, of which the following is a specification.

My invention relates to electrically heated melting furnaces of the kind wherein provision is made for continually washingthe surfaces 0f the refractory lining with molten metal, thereby greatly reducing the power taken for melting the metal, due to the heat stored in the brickwork being transmitted to the metal in this manner, and also tending to prolong the life of the lining, by preventing local overheating, a common fault with furnaces which are stationary during the melti g operation, and to effect a thorou h mixing of the metal or alloy melted.

eretofore it has been "proposed to impart a rocking motion to the furnace in such a manner that a to-and-fro movement is communicated 'to the molten metal, which causes it to approach the pouring or charg- -ing door on either side, Without Aactually letting any metal esca )e at this door, so that local overheating of t e frebrick lining can therefore only take place at that part of the lining in which the pouring door is situated.

The object of my invention is to protect the whole of the melting chamber lining from local overheating and to introduce at the same time other novel and valuable features.

To this end, according to my invention, l construct a melting chamber, open at one end and arranged in an inclined position, to which a continuous rolling motion can be imparted, whereby the molten metal contained therein can be made to cover or wash the whole of the refractory lining" in the melting or high heat zone, a heating elcinent, held against rotation, being` inserted through the open end.

In practice the melting cliamber is pre fee.'- ably made of flask form in' two metal scctions bolted together and lined with rctractory material in the usual manner. tht` neck part of the body being c y-lindrical in shape while the melting section preferably of bulbous shape. C

My invention will be readily understeod by reference to the accompanying drawing,

in which:--

Figure l is a longitudinal section of the furnace made in accordance with my invention.

Fig. 2 is an elevation illustrating a modification of a portion of the apparatus.

@indicates the body of the furnace open at one end, which is preferably made in two sections as at b bolted together and whichv is provided with refractory lining c an opening l being formed through the cylindrical or neck portion of, the furnace and a spout e provided at this point and normally closed by the cover vThe melting chamber thus formed is carried in an inclined position upon a frame comprising a bed-plate g, two bearing brackets It (one only of which is indictated' in the drawing) having between them a saddle provided with anti-friction rollers il, on which the neck or cylindrical portion of the melting chamber is supported, and another bracket having a bearing Z in which a gudgeon m, secured to or formed integral with the casing a at the bulbous end of the melting chamber on the axial line is carried, thereby allowing of the melting chamber beingrotated.

ln practice, the inclination of the melting chamber is such that when the furnace is charged with molten metal, the level of the latter will be slightly below the level of the spout, as indicated in Fig. 1.

Rotary motion can be communicated to the melting chamber by any suitable means. in the drawing, the 'gudgcon m is represented as having a worm wheel n fixed to it. with which a worm o engages, the shaft of the said worm l" ing mounted in bearings in the bracket 7c and being driven, say, by an electric motor, indicated at p through the medium of gear wheels p1. 3

ln the drawing, anti-friction balls g are represented as being arranged between the shoulder of the gudgeon m and the bearing L. to take the thrust due to the portion 0f the weight of lic 'furnace to reduce friction.

r indicates a head which is designed to be inserted into the open end of the melting chamber a, and through which electrodes s, Fig. l, for the formation of the electric arc, are extended. This head r can be inserted or withdrawn, for nistance, by tackle from an overhead runway, seeFig. l., and when in eiec'tiiio fire for 'lent lement may be coniiiineriiit Sucio an zii- 31'; teil. i1 Fig. 2, in which iifitsinee iimtei'izil .fiii'ied mile u through Wl'iieli the i :mil l termiimls or the legde] lo some le advantageous to use 'the leoti'odes foi Jieri" gene ations .e eleetiii': ire

and Subsehead 71 with' :i liezitioe' as d es:

l. an be iisefi, o3-ei@ iiifiiiei.' described. inouml mlviszilile to melt C' point, witli fui when ziiloyiig metals l with the ieSistaiiQ-e element.

pom the ii'iolteii ii'iziteiiiil,

ilei, iior tipping the Qin shown iii the ili'ziwrotation ot me will will loeal--overlieating of 'the uifiieoe iiziing is prevented, while the heat illimite-cl to the lining at 'the point nearest to the lieiitirg elei'oent, is quickly tianslfeiriecl to the m` llnims.

l. im eleeti'iczllly lieziteil melting fuiiiiitoe eompifieing a chamber open one ew? und :iz'xiwged in :in inclined position.I mean rotating 'the chamber imoii't im. imflinei:7 i'vliicli extends longitudinally through `alle el1.:unl e1',zind:i heating element, held against rotation; extending through tlie'open end of said melting Chamber.

2. Jiu electrically heated melting fornace 60 of the kind elniiiied in claim l7 iiiliei'ein the melting chamber is in the. form of in llask, 'the biilbous portion of the' sei l oli: oei" forming e metal ,i'esewoiiz While the eyliiieliiezil portion ot the sziifl elizimber is no- 65 vided with o, pouring spout ami adiiteti to lime zi liezul carrying the heating' lement iiieited int/oit, substantially :is eleimilie.

3. im electricallyheated iiieltiog fiiixnce comiii'ising :i Siillfstznltiiilly Cylindrical 7o shaped melting' elmiiibei' liiiviiig mi open. ou per eiiil am! :L closed ourwfl bottom7 mi suppoitiug the chamber iii ineliifieo poi-siti. menus 'oi io ating the elnii'nliei' About :in ,im

liiio l axis extending longitudinally through the iflxim'ibei', sind :i heating; element extend ing int-5: the open end et sztifl chamber.

4.-. A. furnace of the kind defined by eliim. 3, in which L gildeeon fixed to the bottom. of the eliziii'iliei :mil @tending eoexielly of the S0 exis of votation i'ms a port of tte cimm-

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