USRE11666E - Leaux - Google Patents

Description

A. LAUGHLIN 8v J. RBULEAU HEATING PURNAGB No. 11,666. Reissued May 31, 1896.

INVENTORS, Gluem/WU 6 `'z sheets-sheets. A. LAUGHLIN 8E J. RELBA UX. HEATING PURNAGB. No. 11,666.

Ressued May 31, 1898..

I INVENToRs,

(xA/wam 7 .Sheets-S11eet4. A. LAUGHLIN & J. REULEAUX. HEATING PURNAGE.

No. 11,666. Reissued May 31,1898.

7 sheets-sheen 5..

A. LAUGHLIN & J. REULBAUX.

HEATING PURNACE.

No. 11,666.- Reissued'May 31,' 1898..

FIGB.

' 7 Sheets-Sheet 6. A. LAUGHLIN 8v J. REULEAUX.

HEATING FURNAGE.

Reissued May 31, 18.98.

FlClE.

WITNESSES:

j "fsneets-sneenz., A. LAUGHLIN 8v J. RELEAUX. HEATING FURNAE.

Reissued May 31, 18968.-

INVENTORS UNITED STATES PATENT OFFICE.

ALEXANDER LAUGHLIN, oF SEWICKLEY, AND JOSEF REULEAUX, or WILKINSEURG, PENNSYLVANIA; SAID REULEAUX A-ssIeNoR To SAID LAUGHLIN.

,H EATING-Fu RNACE.

SPECIFICATION forming part of Reissued Letters Patent No. 1 1,666, dated May 31,1898. Original No. 582,476, dated May ll1, 1897. Application for reissue iiled November 19, 1897. Serial No. 659,102.

To, all whom, it may concern:

13e it known that we, ALEXANDERLAUGH- LIN, a resident of Sewickley, and JOSEF REU- LEA-UX, a resident of XVilkinsbuI-g, in the county of Allegheny'and `State of Pennsylvania, citizens of .the United States, have inventedv or discovered certain new` and useful Improvements in Heating-Furnaces, of which improvements the following isa specification.

The invention described herein relates to certain improvements in what are known as continuous-heating furnaces-i. e., furnaces in which the article is charged into one end thereof and forced through and discharged through the opposite end, being heated during its progress through the furnace. These furnaces are-of necessity quite long- 'L'. e., thirty or forty feet.-and are heated by the combustion of gas or the flame and prodi nets of combustion of solid fuel, the heating medium being admitted to the discharge en d of the furnace. It is necessary for eicient heating that along iiame approximately equal to the length of the furnace should be produced. This is 4usually effected byincreasing the draft ofthe Stack at the front end of the furnace. When side inlet-fines are employed in connection with an increased draft, the middle portions of the furnace near the rear or discharge end are not eiiicientlyheat-v v ed, as the flame is' drawn away from such middleportion by the increased draft, asthe two lines or streams of flame are drawn at a sharp angle to the direction of the fiow of the gas and air from the ports and only unite at a considerable distance from the rear end of the furnace. Gas and air have also been admitted through the roof of the furnace, the design being to projectthe llame down onto the articles passing through the furnace. This method is objectionable for the reason that the heating is, as it were, localized, the

flames having a blowpipe action, thereby injuriously heating the articles. f

For the purpose of annealing, furnaces have been constructed with a long chamber through which articles can beinoved continuou sly. These furnaces have been constructed with inlet-iiues arrangedtransversely of the,

heating-chamber, so that articles will pass overnthesenflues in their movement through the chamber. -These iues are located either at the entrance end of thechamber or about midway of Aits length or between these two points; It results' from such a construction that the articles as .they move slowly throughv the furnace are highly heated before they reach the middle of the furnace and are cold when they are discharged. Such ,construction is inapplicable to heating billets,which should.

.for the quick discharge of the billets after reaching the point of highest heat; and in general terms the invention consists inthe construction and combination substantially as hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure l is a side elevation of our improved furnace. Fig. 2 is a longitudinal vertical section of the same'; Fig. 3, a sectional plan view. Figs. 4 and 5 arel a sectional elevation and plan, respectively, illustrating certain modifications in the supports for the articles to bexheated. Figs. 6, 7, 8, and 9 are views similar to Figs. 4 and 5 of further modifications 0I the supports for the articles to be heated. Figs. l0 and ll are vertical transverse sections, the planes .of section being indicated by line X X XI XI, Fig. Fig l2 is a sectional plan view ofour improved furnace, showing the arrangement of the combustion and heating chambers When employing solid fuel. Fig. 13 is a sectional elevation, the piane of section being indicated byline XIII XIII, Fig. l2. Fig. 14 is a longitudinal vertical section on the line XIV XIV, Fig. 15;l and Fig. l5 is a sectional plan View, said view illustrating certain modifications in the manner of supports for the rails or pipes on which the'billets restin their passage through the furnace.

In the practice of our invention the furnace is constructed, as regards the exterior walls andsthe bed 1 thereof, in the usual -or any suitable manner. Along the rear end of the IOO ' ' fines 2 and 3, saidfport's or iiues extending transversely and'acrossthe furnace in proximity to the rear wall thereof. 'The gas-ports connect at their lower ends Witha transverse conduit 4, which in turn connects with a-supply-conduit 5. The air ports or fines 3 are connectedwith a horizontal conduit- 6,through which air is conducted tov said ports. The fl ues or ports 2 and 3 are extended below their points of connection with the air and gassupply conduits, such extensions communicating with pockets 7 for the reception -of slag or other material which would be. liable to choke up the gas and air fines, said pockets being -provided with doors 8, through which slag or other dirt can be removed from the pockets.

' 40n the bed lof the heating-chamber are formed two or more lines of supports or piers 9, extending longitudinally through the furnace from :the front toward the -rear end thereof, preferably terminating in front of' the bridge-wall 10. It is preferred toarran ge on these continuous piers a hard wearingsurface 11 in the form of a rail or tube, preferably the latter, y through which water is caused to circulate to prevent injury by the heating of the furnace. These wearing-'surfaces or tubes preferably extend to the rear edge of the bridge-wall, as shown in Figs. 2 and 3. Provision is made for the automatic movement of the, articles being heated from the main supports 11 to the end discharge-opening and preferably across the ilues 2 and 3. This automatic movement is preferably effected by means of a series of inclined supplemental supports or bridge-pieces 12, which are preferably formed in pairs by bending a suitable lengthof pipe into U shape. 'Ihe front ends of these pipes are supported upon the bridge-wall and extend from thence along the tops of the Walls separating the gas and air lilies and have their rear portions supported bylthe rear wall of the furnace at and adjacent to the lower edge of .the dischargeopening.

1t is preferred to support the rear ends of the wearing-surfaces or 'tubes 11 at a higher level than the front ends of the bridge-tubes 12, so that when an article or billet is pushed A Aolf of theend of the tubes 11 it will drop onto the bridge-tubes with a rotating motion, as will be readily understood by reference to Fig. 2, and slide quickly over the gas and air dues 2 and 3. y

When tubes are employed for the wearing..

lfaces 11 and thel bridge-pieces 12, the outer ends are suitably connected to supply and discharge pipes, so `as to insure a circulation of water or othercooling iiuid therethrough vin any suitable manner known in the art. Theupper portion of the opening at the rear end of the furnace is closed by main door 13, adapted to be raised and lowered in any of the Ways known in the art, while the lower portion'of the opening is closed `by an auxiliary door 14,

having attached thereto an arm 15, which has its upper end pivotally supported or hinged on the main door. This construction-.permits of .the auxiliary door being forced outward by Va billet sliding Adown the bridgepieces,'tl1ere by permitting 'of 'its passage onto the' foreplate 16, by which it is guided onto suitable feed-rolls 17. y

At the frontend of the furnace is secured a shelf or ledge 18, having its upper surface faces or tubes 11 and adapted to receive the billets or other articles to be heatedfrom the bed of the truck 19, which moves on rails transverse of the furnace and between ,itand the pushing mechanism. The pushing mechanism preferably consists of a cylinder. 20, havin-g the outer end of its pistion-rod 21 suitably shaped or provided with 'a ead 22,adapt ed to take an even bearing against the side of an article which it is desired .tof force from the bed of the .truck into the furnace.

In order to provide for the removalofv slag, &c., from` the b ed of the heating-chamber, a ,series of openings'23 are formed through the continuous piers, and suitable doors 24 are arranged in the side wallsA of the furnacein line -with said openings through the piers.

In order to permit of the inspection of the billets or other articles during their passage through the furnace and also of the intermediate charging of such articles into the furnace, a series of doors 25are formed in the side walls, as shown in Fig. 2.

It may sometimes occur in the heating of billets that the portions of the under surfaces will not be properly. heated, on account of their protection by such tubes or surfaces. In order 'to heat' such cool portions, the bridgepieces12 may be arranged out of line with the tubes or bearing-faces 11, as shown in Figs. 8, 5, 9, and 12, so that the surfaces of the billet which were formerly in contact with the of the heat while passing alon'g the bridgepieces.

It is preferred, as herenbefore stated, to

vployment of bridge-pieces independent of the shown in Figs. 6 andv 7, across the iues 2 and 3, such extensionsforming the bridge-pieces. As shown in Figs. 4 and 5, the drop or shoulder for insuring the separation of billets, as

in line with the upper surface ofthe wearingin contact with the bearing-faces or tubes 11* we do not wish to limit ourselves to the em-v tubes 11, as the latter may be extended, as'

IIO

tubes 11 will be exposed to the' direct action o arrange the ends of the tubes 1'1 and the surhereinbefore described, may be so located that the billet will drop o'uto a horizontal portion ,of the bridge-pieces, from Which position it can be drawn by a hook; but it is preferred to so arrange the shoulder or drop that the billet willfall onto the inclined portions of the bridge-pieces and slide or roll along the saine onto the feed-rolls, as shown in Fig. 2.

In Figs. 12 and 13 we have shown an arrangement of lire-chamber 26 for the combustion of solid fuel in such relation to the conduit 4 that the fiame and products of combustion will pass into such conduit and thence up the flues or ports 2.

Where thepiers 9 are made practically continuous to the bridge 10, as shown in Figs. 1 to 13, inclusive, the operation ofthe furnace is rendered difficult from the accumulation of slag and cinder on the piers. These accumulationsprevent the easy movement of the billets and also force them up toward the roof. The slag and cinder running down the j sides of the piers cut them away, rendering renewal ofV yportions of the piers necessary, and such repairs are especially diflicult when the inner piers are cut away, y' In order to avoid these difculties, the piers' extend from the rear to a point Where the heat will be suiiicient to' melt the slag and cinder.

From this` point the tubes 1 1 are supported by one or more comparatively narrow transverse piers 26, as shown in Figs. 14 and 15. In such a construction any slag which drops from the billets Willvbe caught by the pocket in the rear of the piers 9, and such slag as may lodge on the piers will be pushed off by succeeding billets or can be removed by tools inserted through side doors, from which all parts of the pockets and piers 26 are readily accessible not only for the removal of the slag, but also for inspection and repair. y

It is characteristicv of our improved furnace that combustion occurs in the line of move- .ment of the billets through the furnace and the flame and products of combustion are maintained in such line during their flow through the furnace. It. will be observed that the billets or other articles are subjected to the greatest heat just prior to their discharge from the furnace, and the heat is of such character as will not injuriously affect the billets.

We claim herein as our invention- 1. A continuous-heating furnace provided1 with receiving and discharge openings at or near the ends of the furnace, supports extending from the receiving to the discharge opening, mechanism for pushing the billets along the supports to or adjacent to the fuelports or point of highest heat, and means independent of the pushing mechanism for more quickly moving the billets past said fuel-ports or point of highest heat rand out of the furnace, substantially as set forth. y

2.- A continuous-heating furnace provided with receiving and discharge openings at -or near tliev ends of 4the furnace, supports eX- tending from the receiving to the discharge tending from the receiving to the discharge 6c openinggvthe supports adjacent-to the discharge-opening being inclined to cause the automaticv movement of the billets past the fuel-ports or point of highest heat through the discharge opening and mechanisml for pushing the billets along the supports to the point of `automatic discharge, substantially as set forth.

4. A continuous-heating furnace provided -at its opposite end walls with receiving and discharge openings, and having incombination a series' of flues or ports. through which the combustibles enter the heating-chamber,

arranged adjacent to the rear or discharge opening of the furnace and transversely thereto, supports for the articles to be heated extending from the receiving-opening to points adjacent to the ues, mechanism for pushing the articles along thesupports, and bridgepieces adapted to receive the article from said supports and supportr it While passing over the dues to the discharge-opening,said bridgepieces 'being sufficiently inclined to cause the automatic movement of the article over the ues and through thedischarge-opening, substantially as set forth.

5. A continuous-heating furnace,having in combination a series of fines or ports through which the combustibles enterl the heatingchamber adjacent to the rear or discharge end of the furnace, supports for the article to be heated, extending from the front end to points adjacent to the rear end of the furnace and supplemental supports arranged parallel', 1

charge end of the furnace, supports for the article to be heated, extending from the front end -to points adjacent to the rear end, supplemental supportsextending from the main supports to and over the lues at the rear end of the furnace, the rear ends of the main sjup ports being raised above .the adjacent parts of the supplemental supports, thereby forming a drop for the article being heated, substantially as set forth.

7. A continuous-heating furnace having in combination a series of iues or ports through IIO its bed or platform on or approximately on a' which the combustibles enter ,the heating-A` thereof, supports extending from the front end of the ,furnace to points adjacent tosaid fines, and supplemental supports or b ridge-A pieces extending from the main supports overV the fines, said supplemental supports being inclined, substantially as set forth.

8. A continuous-heating furnace having in combination continuous piers or supportingwalls extending longitudinally from the front towardthe rear end of the furnace, one or lmore piers' arranged transversely of the furnace between the bridge-Wall and the ends of the longitudinal piers, andbearingpeces or supports for ythe billets,p&c., arranged ouA the longitudinal and transverse piers, substantially as set forth.

V9'. )The combination of a continuous-heat# ing furnace having openings in its opposite. ends, supports for the billets, &c-.,.extending through the furnace. from the discharge to the receiving opening, the supports adiacent to Ihe discharge-opening being suiciently inclined to cause the automatic movement of' .the'arti'cle past the fuel-ports through said opening, afore-plate arranged at thefront end of the furnace onor approximately on a level with the billet-supports, a truck mov-l able into line with the fore-plate and having level with the fore-plate, and mechanismfor the ends of the furnace, and pipes or supports for the billets extending from the receiving or charging opening toward the discharge: opening, and provided With'one or more cinder-pockets arranged adjacent toI and. below the rear 'ends vof the pipes or billet-supports Vand extending below the latter, and openings Vthro ugh the side walls of the furnace into said pockets, thereby permitting of the removal of the cinder during the operation of the'furnace, substantially as set forth.

11. A continuous-heating furnace having in combination' continuous piers Aor supportingwalls extending lon gitudinallyf rom the front toward the rear end of the furnace, pipes or billet-supports arranged on the longitudinal piers and extending beyond the ends of said piers toward the rear end of the furnace,

vthereby forming a cin'der-pocket in the rear of the piers'and below the substantially as set forth.

Iii-testimony whereof we have hereunto set our hands.

- ALEXANDER LAUGIILIN.

A JOSEF REULEAUX. Witnesses:

DARWIN S. WoLooTT, 11. E. GAITHER.

pipes or supports,

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