US2006978A - Feed mechanism for stokers - Google Patents

Description

July 2, 1935', J. WYNN, JR 2,006,973

' FEED MECHANISM FOR STOKERS Filed April 7, 1931 3 Shets-Sheet 1 6 d7 m m WW m John PlfyrmJr dktompqu J. WYNN, JR 2,006,978

FEED MECHANISM FOR STOKERS Filed April 7, 1931 3 Sheets-Sheet 2 m 0 m W I! III MIIWWHW T all I \W I- w JW 0 WY. #1 @L .o\ IQ Q. w a x N I my NW 9w w m\ mm MW QM mu 5% mm. mm W H N July 2, 1935.

July 2, 1935.

J WYNN, JR

FEED MECHANISM FOR STOKERS Filed April 7, 1931 5 Sheets-Sheet 3 gjwventoz umanl 2, 1935 UNITED STATES PATENT OFFICE Faun ink STOW I Apnflcat iz ri z u zfff sr'z ltf 528,305 5 mm. (Cl. 221-138) The invention relates to mechanical stokers and more particularly to the mechanism for agitating, sizing and feeding coal from a bin, or the like, to aconveyer of a mechanicalstoker of the general type disclosed in my prior application Serial No. 507,095.

1 An object of the improvement is to provide a rotatable, perforated disk in the lower portion of a coal bin or the like for agitating the coal leading'to the, furnace.

Another object is,to provide a stationary banking bar arranged to cooperate with the rotatablejdisk to hold a portion of the coal against movement with the disk in order to more effectually feed the coal through the perforations in the disk. 1

A further object is to provide a stationary shearing bar beneath the rotatable disk for the purpose of cutting or breaking large lumps of coal which may pass partially through the openings in the disk, thus properly sizing the coal for use in the stoker.

A still further object is toprovide a wiper lug or stud, preferably upon the banking bar, for breaking. the upper portions of large of coal which may pass partially through the openings in the disk, or for'removing such large lumps of coal from the openings.

Still another obiectis to provide an agitator bar extending beyond the peripheral portion of the rotating disk, for agitating the coal'around the periphery of the disk and assisting the same to.be fed onto the disk.

Another object of the improvement is to provide' amutilated gear drive for intermittently rotating the perforated disk, whereby the jarring due to repeated starting and stopp of the movement of the disk greatly increases the feeding'of the coal through the perforations thereof Still another object is to provide such an ap paratus in which the feed screw has a greater pitch beyond the perforated disk so as to carry the coal away from the vicinity of the disk at a rapid rate in order ,to prevent clogg n of the conveyer screw with coal adjacent to the disk. Other objects are to improve and simplify the mechanical structure and driving means for the ignisproved feeding, sizing and agitatingfmecham. The above andjother objects later referred to, or which will appear in the accompanying drawings, or the following description, may be attained by constructing the improved, feeding, sizing and agitating mechaand feeding coal of proper size to a conveyer.

zontal plane.

amen will be nism in'the manner illustrated in the drawings forming a parthereof, in which;

Figure 1 is a plan view of the improved mechanism, parts being broken away for the purpose of illustration;

Fig. 2, a. section on the ,line 2--2, Fig. 1, taken longitudinally of the feed screw;

Fig. 3, a section on the line 3-3, Fig. 1, taken transversely of the feed screw: and

Fig. 4, an elevation of the mutilated gear for 10 intermittently driving the disk.

Similar numerals refer to similar parts throughout the drawings.

1 The invention contemplates the feeding of fuel in the form of slack, finely dividedv coal or the 15 like; directly from a coal bin or similar receptacle to a furnace, and for this purpose a con-' veyer screw Ill extends into the bottom of the coal bin, being located within a tubular housin "which communicates with a trough [2 located 2!,- within the coal bin and receiving the charging end portion of the conveyer screw. V

The conveyer screw has a greater pitcn within the tubular housing II, as indicated at l3, than the end portion of the same within the trough, as indicated at ll, for the purpose of'rapidly carrying the coal away from the vicinity of the feeding, sizing and agitating mechanism which will be hereinafter described. 1

, The end portion of the conveyer screw is pro-' vided with the shaft 15 journaled through the bearing I formed in the end wall ,of the trough l2 andextending through a gear housing I! formed integral with said'trough, the end of said shaft being journaled in a bearing I8 mounted in an opening is formed in the outer wall 20 of said gear housing and preferably provided with the peripheral flange 2| through, which may be located cap screws 22 for .connecting the bearing to the-reinforced flange 23 formed integral with the wall 20 and surrounding the onening l9.

Abevei pinion 24 is fixed upon the shaft I5 in any suitable manner, such as by the threads 25, being located betweenthe bearings l6 and ll. A ring gear 26 is rotatably mounted above the trough l2 and meshes with the gear 24, for

the purpose of rotating said ring gear in a hori- It should-be understood that the feed screw III is driven by any suitable means (not shown) and if it is desired to intermittently operate the ring gear 26, the bevel pinion may be mutilated as shown at 24a. in Fig. 4, having teeth around only I about one-fourth of its periphery, whereby the ring gear 26 will be given annular flanges 23 and 2! upon which it'is" guided for rotary movement in a horizontal m. [N a The disk 3! is mounted upon the ring gear 2,

being fixed thereto as by the screws 32, and the central portion of said'disk, located .above the T trough I2, is provided with openings 33 of 'a' diso ameter not greater than the largest size of coal intended to .be fed to the conveyer' screw l3, so that theppenings 33 act as sizing apertures.

A sh bar 34 is located diametrically across the under side of the disk 3|,being pref- .ersbly provided with the depending end portions 35 resting upon the lugs 36 formed at the sides of the trough l2, screws 31 being located through said depending portions 35 and into the lugs for rigidly mounting the shearing bar in stationary so position. 1

A post 33 is fixed to the center of the shearing bar 34 and extends upwardthrough the central aperture 33 in,the disk 3|, aspacing sleeve 43 surroundingsaidpostand beingspacedfrom as theeentralopeningflofthediskapertin'e 43, resting.

and held in fixed the nut 43 upon the end of the post. 33.

banking is thus spaced above the disk and extends radially to a point beyond the ,periphery of the disk, being then bent downward substantially at rightangles as at 44 and 45 then inward as at '48, preferably terminating in thedownturned end 43 which may be secured to the adjacent side wall 41 of the casting forming the trough and gear housing, as by the screw 43. The banking baris thus heldin stationary a positionandserves toform a=stationary bankcf radiallyacrossthedisk atthis coal extending point, thus assisting in feeding the coahdown- .ward through the apertures 33 in edisk, and mm the trough, as thedisk rotates.--

Inordertobreak'theupperportionsofanytures large lumps of coal which become lodged in the apertures 33, our tomove thesame out of said apertures, to permit smaller coal to pass'therethrough, a depending wiper lug or stud 43 may befixedupontheundersideoi'thebankingbar, in line with .the centers of the openings 33, and.

may be provided with the beveled lower end n to assist in breaking la rge lumps of coal. For the purpose of agitating the essurrounding the diskand in order to cause the same to feed downward onto the surface of the disk,anagitatingbarilmaybefixedtothe under side of the diskas by the screw '3 and 4 extends outward; beyond the periphery of the disk, being. of suitable length to permit thesame topass the vertical portion 4410f the banking In the operation of the apparatus the conveyer screw I3 is rotated in the' direction of the ar- 78 rows shown in Figs. 2 and 3, and through the the trough l2 and gear bevel pinion 24, upon the shaft of the screw, the

perforated disk 3| is rotated either continuously during the rotation of the screw, or intermittently, depending upon whether a continuous or mutilated bevel pinion is used. 0

'As the disk is rotated, the coal thereon will be carried around by the disk, some of the finer coal and smaller lumpspassing down through the apertures 33 of the disk into the trough II. The coal beingalways moved in one direction 10 will bank against the banking bar 4|, holding a' portion of the coal stationary at this point and causing the same to more rapidly feed down through theopenings of the moving disk.

Large lumps of coal which may pass part way through the apertures l3 and become lodged therein will be sheared or broken by the shearing bar-34 as they are brought into contact therewith. Any large lumps of coal which become lodged in the apertures 33 and extend upward therefrom will be crushed or broken by the wiper lug or stud 49 as they are moved into contact therewith or will be dislodged'irom the apertures and thrown to one side by contact withsaidwiperlug K The agitating bar 5| will continuously move through-the mass of coal directly surrounding the disk, undermining the same and causing it to flow over the disk.

By providing the mutilated bevel pinion it will 80 be seen that the disk will be intermittently rotated, being started and stopped during each revolution of the feed screw, the jarring due to the constant starting and stopping of the disk further in feeding the coal down 35 through the apertm'es 33 of the disk and into the feed trough l2. As the coal 'is fed to the tough I! it' will be conveyed out of the same by the feed screw and due to the greater pitch ofthescrewasshownat i3,withinthetubular housing II, the coal willbe more rapidly fed away from the vicinity of the feeding, sizing and agitating apparatus above described.

As shown in Figs. 2 an'd'3, the rotatable disk 3| is spacedsome. distance above the conveyer screw. providing a above and partly around the screw, which may be filled with coal as the disk rotates. with such a construction it will be evident that in the event the coal is wet, ordamp,\,and may at times bridge across the ,apertures in the disk, preventing feeding of coal downward through the same, there will be. a surplus storage of coal in the magazine which may be delivered by the screw until the aperin the ,disk are, a ain cleared, permitting coal to again feed therethrough.

I claim:

1. Fuel feeding mechanism including a trough, a rotatable diskfabove the trough and having sizing aperturestherein, a stationary shearing bar rigidly mounted below the disk for shearing fuel lodged in said apertures, and means for rotating said disk to feed fuel through said apertures into the trough. 1

2. Fuel feeding mechanism including a trough, a rotatable disk above/the trough and having sizing apertures therein, a stationary shearing bar radially located below the dis'k for shearing fuel lodged'in said apertures; and means for rotating said disk to feed fuel through said apertures into the trough.

3; Fuel feeding mechanism including a trough, a rotatable diskflabove the trough and having apertures therein; a banking bar above the disk, a stationary shearing bar below the disk, and

means for mum mum to ma fuel throuzh said apertures into the trough. I

4. Fuel feeding mechanism ineludin: attollllr.

a rotatable dink above the trough. end havingaperturea therein, shunting bar above the disk,

awiper lug upon thebankinz berandadapted toregiste with theaperturee inthedisk, a -stationary shearing bar below thedisk', md

means 101- rotating the disk to feed fuel through Osaidap'erturesintothetrouzh.

apo'ome y

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