US1424923A - Pulverizer - Google Patents

Description

' inane-as.

ernaartoe.

PAUL S. KNITTEL, F

COMPANY, or

ST. LOUIS, MISSOURI, ASSIGNOR TO AMERICAN ST. LOUIS,MISSOURI, A CORPORATION OF 'MISSOURL PULVERIZER PULVERIZER.

Application led .'l'anuary of the pulverizer in close proximity to the Fig. 1;

ig. 3 is a plan bars showing the grate -bars tioned so as to obtain the narrow spacing;

the drawing,

hammers carried by the rotor.

The principal object ofthe present 1n- 'vention is to make prov1sion"for varying the spacing of grate bars.

rlhe invention consists in a grate bar having spacing lugs projecting from its opposite sides so arranged that when a series of such bars are placed side'by side in one position, `one spacing. is obtained and when one of such bars is turnedend for end a di'erent spacing is obtained; and it further conslsts in the arrangements and combinations of parts hereinafter described and claimed.

In the' accompanying drawings, wherein like symbols refer to Ylike parts wherever they occur,

Fig. 1 is a vertical cross-section taken through the lower portion of a pulverizer showing a number of grate bars embodying my invention arranged thereinE the bars being shown in cross-section on the line 1-1 in` Fig. 2; A

Fig. 2 is a longitudinal section taken through the pulverizer on the line 2-2 in view of a number of grate arranged with their lugs opposite each other to obtain the wide spacing;v

Fig. 4 is a plan view of the bars so posiand Fig. 5 is a view similer to Fig. 4 showing a modified form of grate bar.v

My invention is shown in connection with a pulverizer. y As shown in'Figs. 1 and` 2 of the sid@l walls ofthe lower casing 5 of the pulveri'zer are each provided with an inwardly projecting arcuateange 6 upon which the grate bars 7 are supported to form an arcuate grate; rlhe grate bars are substatntially T-shape in cross-section and comprise a stem portion 8 whose thick- Y Specification of Letters Patent.

bars intended'for use in connectlon Patenten aug. s, i922.

2, 1919. serial No. 269,328.

ness increases from the bottom towards the top, tion. The stem portion 8 of the bar diminishes in depth from the middle toward each end, and the bars are provided with bearing ends 10, which rest on the arcuate flanges 6 of the side walls of the lower casing 5.

Each of the grate bars is provided with spacing lugs 11 on its opposite sides, which are flush with'the upper surface of the head portion 9 of the bar and have wide fiat faces. v.The lugs on one side of the bar are located at equal distances from the middle part or mid-line of the bar, and the lugs on the other side of the bar are also loeatedat equal distances from the mid-line, but are oifset longitudinally of the bar from its middle towards each end with. respect to the lugs on the opposite side. With the bars arranged side by side in the same position, (as shown in Fig. 4) the bars are spaced apart the thickness of the lugs,l the oifsetting of the` lugs causing the lugs on one bar to clear those on the other. On the other hand, when one of the bars is turned end for end with respect to its neighbor (asshown in Fig. 3) the wide flat faces of their lugs abut against each other and thus the spacing of the bars is the sum of the thiclmesses of the meeting `lugs. The opposite sides of the lower portion of the stem 8 of the bars are provided with lugs 12 which are disposed directly below the lugs 11 at the middle portion of the bar. rlhese lugs 12 space the lower portions of the bars which have a tendency to tilt when the bars reach a'position on either side of the arcuate supporting flange 6 of the -side walls of the lower .casing 5. When the bars are arranged in a horizontal line, as when they are used in connection with furnaces, these lugs 12 may' be eliminated.

By placing the bars in the position shown in Fig. 3 with the lugs of the adjacent bars registering, the wide spacing ,can be .obtained. By turningv alternate bars end for end and placing them'in the position/shown in Fig. 4, `with the lugs of one bar bearing p against the body portion of the adjacent bar, the narrow spacing shown can be obtained. .With a set of bars of the kind described having lugs projecting the same distance from the sides, two different widths of spacing can be obtained, but it isoblvious that vwith sets of bars wherein the several bars and a head portion 9 of rectangular secsaid bars registering,

i is obtained and, when i registerfand a different Width"` of spacing f f said l opposite sides Idisposed in said `midvvay ybeing. offsetlongitudinally ofthey bar with respect tof the lugs `on lthe `vopposite side yof along side of a similar having spacing lugs which project different distances from their sides, various Widths of yspacing can be obtained. v v i Asshovvn in Fig. 5, twovwidths of sp-acing can also be obtained with twosets or styles of grate 4bars eliminated and bar B having the -cent to the left of the center line eliminated. These tWo types of bar are .necessary to obtain the Wide spacing, but to obtain the narrovv spacing, oneor the other or both types of bar may be used.

The hereinbefore described baris self-k spacing, can be `quicklyplaced in position and When Worn or vdamaged can be easily replaced. Due to the Shape of the head portion 9l at the top of said bar the life 'of said bar is longer than the bar of the type heretoforeused. fThe head portion 9 of the bar is rectangular in cross-section `and there tojwear at the corners, Which tore le'ss `apt are right angles, than the bars oftheordinary-type which is V-shaped incrosssectionA and has sharp angles at its'upper corners.'

- WhatIclaini'is: i

l. A pulverizer having an arcuate grate comprising separate vgrate bars,l each gratte bar consisting of a vertical'stemportionv portion` at the' .top thereof,

having a head I gratebarl having spacing lugs yon its provided with fiat 'end faces,

' some of the lugs on one yside'bf "thebar being disposed lin pairs at equal distances from `a 35i line midwayfoi the length' of the bar,y and some of the lugs on the other side lalso being pairs at equal i distances from point and the lugs onfone side said bar, Wh'erebywhen said bar'is placed bar lW'ithfthe lugs of one Width". of spacing said bar is'vturned end said barsare out lof for end the lugs of i is obtained 2. -A fpulverizer having" anl arcuate lgrate comprising separate grate bars, eachgrate 50 bar consisting of a verticalstem vportion having' airectangular head, said'grate bar having-bearing portions at its opposite ends,

vone side of -saidbar havingbearing lugs at f each end and a lugon each side "of its middle -part/ spaced equidistant therefrom, 'the otherlside vof-s'aid bar havinga lug located A and B, bar A having the` lug adjacent to the right of the center liney lug adjaand offset yinwardly from `bar4 with respect to the lugs` on said register* `one Qvvidth of' tained l and. with" every ,der 0f December, 1918- at its middle part and having a'lug near veach end spaced equidistant from said midf dle part and `offset inwardlyfrom each end yofthe bar Withvrespect to the end lug on havingav head portion of substantially `rec-y tangular section, said grate bar'having bearing portions'at its opposite ends, one yside of said grate bar havingspacing'lugsat each end and a spacing lug at the top and'bottom "each -side of the `and spaced equiof saidside located on middlefpart of the bar distant therefrom, ythe otherv side of said bar having lugs at the top and lbottom thereof located'at the middle "art ofthe bar and having a lug neareadi distant from the middle each end of the rst mentioned side.

`LA vpulveriZer having ,an arcuateA gratey g'comprislng separate grate bars, each grate barhaving'*spacing lugs on opposite sides oiset'longitudinally of` the bar, the lugs on one'vsi'de being so'positioned as to b e outv of end spaced equiy of Said bar register'w'vith thelugs of a similar bar alongsaid bar when it is turned endiforjend with its ends flush with the ends of the' otherbar.

5. Av pulver'izerhaving an arcuate grate ycomprising a series'of I y '-s'ideb'yv side, eachof saidgrate barsfhaving spacingflugs'; `on both sides',"the lugs lon one side of 'said barlbeing'ol'se't longitudinally grate bars arranged of the bar from its middle towards, each end With respect'to thelugs on the opposite side 'with the bars placed of said bai-,whereby side by side in the same position, their lugs spacing is oby other one of :said bars turned Iend for end, the lugs ofadj acent bars are out of registerand a different width o'f-'spac-ing'is obtained.y 'p l :Signed-"at St. Louis, Missouri, this 28th f PAUL vs.. KNITTEL.

" side thereof and yinregister:with thelugs ofv

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