US2028977A - Automatic stoker for coal burners - Google Patents

Description

Jan. 28, 1936.y T. GOWER 2,028,977

AUTMATIC STOKER FOR COAL BURNERS Fiied July 2, 1935 www Patented Jan. 28, 1936 UNITED STATES PATENT OFFICE 4 Claims.

invention relates to stokers for coal burners.

Y An object of the invention is the provision of a stoker including a transmission having a pair of eccentrics rotatably mounted and carrying pairs of gears which are shifted into meshing relation with alternate pairs of gears on another shaft.

\ Another object of the invention is the -provision of a stoker in which a pair of worm conveyors are located at right angles to each other with one conveyor feeding fuel from a hopper to the other conveyor and with means for regulating at will the speed of the conveyor.

vA further object of the invention is the provision of a stoker for coal burners in which worm conveyors that deliver coal to the furnace are operated at selective speeds which are most suitable for the purpose.

This invention will be best understood from a consideration of the following detailed descrip tion, in view of the accompanying drawing forming part of the specification; nevertheless, it is toV be understood that the invention is not conned to the disclosure, being susceptible of such changes and modifications as define no material departure from the salient features of the invention ras expressed in the appended claims.

In the drawing:

Figure 1 is a horizontal section of an automatic stoker and speed controlling device,

Figure 2 is a transverse vertical section taken along the line 2-2 of Figure 1,

lFigure 3 is a fragmentary front view in elevation of a stoker, A

Figure 4 is a longitudinal vertical section taken along the line 4 4 of Figure l, and

Figure 5 is a fragmentary vertical section taken along the line 5-5 of Figure 2.

Referring more particularly to the drawin I0 designates a transmission casing to which connected a conveyor casing II while the numeral I2 designates a screw conveyor casing which is in open communication at I3 with the conveyor casing I I.

A screw conveyor, generally designated by the numeral I4, consists of a shaft I5and a spiral fin I6 lwhich moves the coal from a hopper (not shown) in the direction indicated by the arrow in Figure 2 to the auxiliary casing I'I.

A screw conveyor, generally designated by the numeral |8,.includes a. shaft I9 and a. spirally arranged n 20.

A drive shaft 2| is provided with a pulley 22 55' Y' locatedexteriorly of the` casing I!) and is driven by means of a belt from an electric, motor (not shown4 atfa predetermined speed. `The shaft 2| is provided with a worm 23 intermediate its ends.

The shaft is mounted in bearings 24 and 25 formed in the side walls of the housing I0.

(Cl. 'f4-352) A shaft 36 is mounted in bearings 21 in the end walls of the housing I0 and has a worm wheel 28 in mesh with the worm 23 whereby the shaft 26 is driven from the shaft 2|.

A pair of spaced gears 30 and 3| are keyed 5 to the shaft 26 and are therefore revolved by the same.

A sleeve 32 is loose on the shaft 26 and is formed integrally with the worm gear 28. A pair of gears 33 and 34 located'at opposite sides of the 10 worm gear 28 are also integrally formed with the sleeve so that the gears 28, 33 and 34 revolve as a unit freely on the shaft 26.

A shaft is mounted in bearings 4| formed on the end walls of the housing Ill. This shaft 15 is adapted to be rocked for a purpose which will be presently explained. It will be noted from Fig. 6 that this shaft is provided with a pair of eccentrics 42 and 43 spaced from each other by collars 44. 20

A gear 45 is mounted on the eccentric 43 as is a gear 46, the last-mentioned gear being inte. grally connected with the gear 45. A collar 41 naintains the gears 45 and 46 on the eccentric A gear is integrally connected with a gear 5I and both gears are mounted upon the eccentric 42. A collar 52 maintains the gears 50 and 5| as a unit on the eccentric. While the gears 45 and 46 are integrally connected, as are gears 3Q 50 and Y5|, these gears may be made separately and connected together in any approved manner.

A worm 55 is secured to a shaft 26 and this worm meshes with a Worm gear 56 secured to. the driven shaft I5 of the conveyor I4. 35.

An auxiliary housing 56 is secured to the front wall of the housing I6 and of the auxiliary casing A sprocket 58 is located in this auxiliary housing and is secured to the projecting end of the shaft 26. A chain 59 is trained on the sprocket 40. 58 and also on a sprocket 60 which is secured to the conveyor shaft I9 where said shaft projects through the front wall of the auxiliary casing 1.

A rock lever is keyed to a projecting end 66 45 of the shaft 46. The lever is provided with a hand grip 61 adjacent its free end for rocking the lever and likewise the shaft 40. A clip 68 acting as a stop is adapted to be engaged by the lever 65 when it is in its uppermost vertical posi- 50 tion. A second clip 69 acting as a stop engages the lever 65 when said lever is in its lowermost vertical position.

The operation of my device is as follows: Power is applied to the pulley 22 by means of a belt 55 preferably driven by an electric motor at a predetermined speed. Since the pulley is secured to the shaft 2| the worm 23 is revolved which drives the intermeshing worm wheel 28 which is loose on shaft 26. 50

y AAs. shovvn iniFig. gear 33,1Which is loose on the shaft 26 Vand. connected-With the worm Wheel '128, meshes tfith gear 45 which is loose on the eccentric 1135 The gear 46 being connected to -the gear 45 is in mesh with the gear 3U and itV vWill be noted that gear 30 is keyed to the shaft Ythe Vcasingu l i` from the hopper (not shown) into Y ce oppositelyV disposed'eccentrics thereon, a pair oficonnected gears on each eccentric,V a pair' of spaced gears keyedto the drivenshaftLeachof Y the last-mentioned gears being in'substafitially the same vertical planervvithY one of the eccen- Vt'rically mountedV gears, a Worm gearV loosely 1 mounted on the driven shaft, gears on opposite fsidesjof theworm gearV and connected thereto means for rotating the Wormgeargthelast-mehtioned gears being in meshing alignment Vvvithone each of Vi'heotlier gears on the roei; shaft, meansV 46 so that a Vpredetermined speed if/the'` shaft '26 is had. VThe shaft 26 is thus driven at :low Y the similarly disposed gears onV the drive'nrshaft rspeed.- f I i. Thehshaft 26 revolves the sprocke.

58 y whichV in turn drives the chain 59 and the sprocket 6th Since -the last-mentionedsprocket is directly connecte'dtothe shaft'l, the screw conveyor i8 is revolved in the same direction as the shaftlg andthesprocket. `f

Thescrew conveyor -iliv carries the coal through the', auxiliary casing `|`l and Ythisy coal is then j carried'by thescretv conveyor i8 through the YLScasingIZ to the'furfiace (not shown) i' As shown in Fig, li thergear 45 is in inesh vlith': thefgear 43 Vand thefgear i6 is inY rn'e'shY with the j gear. 36. Y The-other'pairs of gears upon the ope' Vposite'sides of the shaft'Zl are out of mesh. VVWhen/it is desired to change the speed of the 'conveyor shafts I5` and I9 the lever E5 'is rocked bythe hand. grip 67 frorn the stop 'O1' clipy 68 to thestop or clip 69.r In view of the diametrically 'anclfpppo'sitely positioned` eccentrics i111.V and e3 .for actuating therock shaft so thata pair of theY gears on 'thelshaftf will be'moved into meshwith while the other... pair of gears Von the rock shaft YWill'bey moved out of Vmesh tvith similarly disposed gears von theY driven shaftf In a Stoker for V'coal burners pair of gears secured to said shaft, aV rock shaft Vprovided with aV pairV of oppositely disposed eccentrics, a pair of connected gears on'one eccentric Ydriven shaft, a pair lof connected gearson the Y fer actuatingtherock shaft for V inovinge'ne set`v of gears thereon awayfrom meshing relation withV Vgears' on tnerdrivenY shaftand for moving the l-the;rocking ofthe shaft l0 causes thefgears l55.

andll to beim'oved out oflmesh with the respective; gears 3.3 and 3G. At the same time, however.;'"gears E'sfand 5l arermoved Vinto meshing 'loose on the'shaft. Y

Yrelation,respectivelyvvith the' gearsV 3Q andV 3l. .Y v- Thegshaftr26 isnovv driven throughthe` revolving e .gear 34its intermeshing gear' arid since gear Y 5I is connected togear V5l?, the gear 5| transmits i rotation `to its interineshing gear 3i; VThis gear e. is keyed to the shaft ZlivvherebyV said `shaft is revolved. Gears 34 and 50 being of substantially Y the same diameter the speed'of'gear Ef'l Will therefore be" of substantially thesame speed as 'gear 341 I-Iowever, thegear 3l is'larger Vthan the gear 35 so that the speed of shaft'z' will be slightly `under that of i the .shaft 2l'although the speed of the s'hafteZ atithis tinieisrV greater vthan it had been when thelever, ervvas in the position:

`-VS/'henfthe shaft n Y I y pairV of the gears 45 and iE on the` eccentric d3' finte meshing relation YWith,"arfixed gear on .the

' shown Fig. 3.

meshing with a fixed gear and a loose gear'on the other 4eccentric normally out Vof mesh'with the other xed gear and the other loose gear, means gears on the other'eccentricinto meshing relationY means for rotating the connected gears which are In a stoker for coal burnersniny which aro tary conveyor for the coal, vis operated at varying speeds by a driven shaft'means for varying thei speedof. the driven shaft and comprising a Ysleeve Y Y Y4o f loose on the shaftrand provided with arpairoi. Y

spaced integrally formedgears,r a gear rateach` side of the sleeve'and `seuredto said shaft, aV rock shaft provided with spaced. eccentricsfa pair I of connected gears on each eccentric,`imeans for g actuating the rock shaft for causing oneecentrie Vto ifnoveritsV associated gears` intomeshing rela-rV tion Withra fixed gear'and argear onthesleeve while movingtheepair of gears on the other ec-f,r Y

centric ont of meshingrelation with VVthe' other j Y. i

' fixed gear and'gearconnected to the sleeve on thef driven shaft, andf means for. rotating thek sleeve.A

is'rocked it may Inove a Y driven shaft and agear connected tothe sleeve Y While movingthe gearsvand' 5l on .the eccentrici 1112V outiof meshing rrelation with theasso'cifated gears f on the driven shaft." .On the other Y .'haridwhen the lever 65 is rockedto'a point Y 'intermediate the stops 68' andi69 all ofthe gears'v on the eccentrics Il?. and 435. willi be movedout" Y vbffmeshing relation VWith ,the :associated gears on thedriven shaft. Some'forrn ofstop means Well fkn'ownr'inthe art may be employed forfretaining Y 'the lever 65 in Ythis:intermediateposition. Y.

@.Iclaim:y 'fu c ls'lnfa stoker for coal ,'burnersjin Whicha kro- Y' tary conveyor for the eraf andfcomrfising a rock-shaft 'a Reiff l Y Y 1 I i v Y 4 coral is operated'byadriv'en"v f shaft, means for varying,v thespeed Yof the driven 4. In aestoker for coal burnersiin 4Which aro- Ytary conveyor'for thejcoal, is operatedat varying Vspeedsvby` a driven shaft, Vmeans for varyingthe speed of the driven-'shaft and comprising asleeve Y I. loose on said shaft and provided'with'spaced gears` connected to theA sleeve, Va Worm Wheel, letweenfV f saidgears vand connected tothe sleeve,;a drive? shaft having a worm meshing with theVworniV` Wheel, Va rock shaft provided Ywith spaced eccenl` Y trics, a pair .of connected gears onjea'ch eccentric i s agear on the. driven 4shaftfjat each'side of theY Y Vsleeve and iixedto said shaft, means for operatingY Y the rock shaftsand causing one eccentric tomove gother'gear on'the'sleeve;

65 thegears'thereonrint meshing relation with*Y one .v ofthe fixed gears fon the driven shaftsandfa 'gearf securedto the sleeve 'WhileAkmovi/ng. the gearsoni` f

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