US1021906A - Pulverizer. - Google Patents

Description

NEW JERSEY.

Specification of Letters Patent.

essieivon To ALLis- .avcoiieoizamion on PULVERIZER.

lwatentedepi. 2, ill-d2..

Application filed october 27, 191i, Serial Zelo. 657,175.

To a/ZZ whom it may concern: A Be it known that L CLIFFORD el. ToMLiN- son'7 a citizen of the United States, residing` at. West Allis, in the county of Milwaukee and State of lVisconein, have invented a cer-- tain new and useful Improvement iii Pulverizers, of which the following is a specilication.

This invention relates to improvements in the construct-ionV of rot-ary impact, pulverizers in which raw` material is pnlveriz'ed by a series of beaters or hails .revolving at a high rate of speed within an ii'ielosiiigr casing.

The object of the invention is to provide l a simple and eilieient Construction of rotary impact. pulver-imi" wherein rook or other similar substances can he pulverized rapid suoceesion of impacts with a Series ot rapidly revolying beaters and anlad'iaeent series of stationary easing liners, the liners being soformed that they will tend to ali-- tomatically return the material to the beaters alter each of the suooessiye blows.

A clear conception of an embodiment of the'invention een be had hy referring to Ithe accompanying drawing forming a` part of this specification in. which like reference.

oharaoteie designate the same parts in dit -f feront Views..`

igure l Vifs a central. veitical sentieri tliibugl ja piilverizeiecasing', liners and y 2 is a similar section through the lower portion of'a pulvei'iaer casing showing e modified,v formy of -disclii-irge screen. Fig. 3 is aniend View ofi the eover lportion of a pnlverizer casing; lookingn .wa-rd the lined interior thereof.

The piilvei'izer casing consiste essentially of a base or lower portion 3l, an inlet or hopper portion 1, and a.- 4cover portion 2,

these three portions ooacting' to form a comn plete inclosing casing oir-wall. The pulver-A izer shaftl) is mounted in hearings notshown, which are Supported or formed on y The inlet or ho er fortiori oi" the oase .i r

either sideo the ulower casing The bmi suspension member 16 is lined to the shaft, 19 in any suitable manner and "nies a series of pivots 20 fromwliieh pivots .the beatersior balls 18 are siiapended,

ing is provided withan inclined liner :El and` a second 'liner 3 which is so directed to ,ward 'the liner 21 as to gartially ehehe or The liners 24, Q5, 26, are inserted orv mounted in the cover portionQ of the` casing and are held in place by side liners 17 coactiiig with the Vertical side surfaces of the. cover portion EZ, see Figs. l and 3. ln- Volute surfaces 4., 6;. 7, which are formed about a 'Cylindrical surface represented by the line 27 as a formed on the liners /l, 25, 26. Surfaces El, l0, ll.. "e" i ,h are substantially tangent to the cylindricallM surface represented by the line 27', intersectrthe siicoessive involute eur- "faces il, 57'6, '7, respectively'.

The screen bare l/l each have an involute surface 8 generated about the cylindrical surtaee repi'esented by the line 28, and a Second' surface substantially tangent to the saine cylindrical sur-face. Discharge open- 13 exist hetii'een successive screen hars' lll. The screen hars are retained in posivtion by flat Side liners 15 which ooact with Vertical eide walls; ofl the lower easing 8l and closely i'it the ends oi the bare laf.

'llie screen bar le may he i'eplaeed7ii`. dee sired, by aseries of plain screen bars Q5), see Fig. 2. The hars 29 rest upon two inwardly projecting circular ledges 30 foiimed one ou each of the opposite vertical side walls of the lower casing 31 and are\ held in place by ineens of the flat side liners 51. The here 29 have enlarged end poi'tioiie, so that with a series of'bars in normal position, the end portions onlyof adjacent hars ooactl,

foriniiigdisoharge lieb-.wma sncf ceseiye hars.

During the operation of the pulverizer,

material to he .pulveiized f isA admitted through the hopper opening ot the inlet porand against. the inyoln'te surfaces 8 of the por- the heaters against the ini/elute- .surfaces e, 5, 6 7 oit the liners 24, 25, 26,.

generating' surface, are

screen bars 14. It is ay well known law that if a perfectly elastic body is thrown along a tangent to the generating. surface and against an involute surface, the body so thrown will be returned' directly to the point from which it was first thrown. With this principle in mind it will be seen that as the material is thrownploy` the balls 18 against the involute surfaces of the liners and screen bars'in a direction substantially tangent to the generating surfaces of the involutes, the tendency will be for the involute surfaces to return the material to the position from which it was thrown. Since the ordinary material thrown into a pulverizer is not perfectly elastic, however, the material will not in reality be returned to vprecisely the position from which it was thrown but will probably be. advanced slightly along'the path of the rapidly revolving bails 18 instead. However, as the material is returned to the path of the rapidly revolvingbails, it is again. thrown bythe reaction dueto the impact with theI bails-against an involute surface of 'one `of the stationary liners of the adjacent wall.

The exact surface., against which the inaterial is thrown depends upon its angular advancement'afterits preceding return to the' path of the bails. Thus the material is continually and successively subjected to a l series of impacts withvthe bails and involute surfaces 4, 5, 6', 7,8, until it is eventually reduced to a 'tine powder, after which the dust particles can be withdrawn from with `in the'casing through the openings'l hy the aid of a fanor'other suitable means.

It should be noted that thetangent surfaces'-9, 10, .11i 12, serve to prevent the :man erial which is being thrown outward, from avoiding impactwit-h the involute surfaces. -llie lingeL 3 which projects toward or ap flaches the liner 2l,-prevents material adnit'ted to the machine from being returned through the inlet hopper. It has also been found inconstructing a' machine with the liner 3 as shown,'thatI a continuous even feed of niaterialto` the pulverizing chain'ber is obtained. Bly'.cnstructingl the'machine as disclosed in Figs. l and 3, it will also be noted that the device is entirely .an impact ,machina no grinding 'of the material be tween. the ends of the hails. andscreen hars being' permissible. i

'It should bevunde'rstoo'd that it is not desired to he limited to`theexa'c`t details of construction shown and'described', for obvious modifications will occur to a person skillled in the art.

merece lt is claimed and desired to lsecure by Letters Patcnt,- I

l. In a pulverizer, a casing, a beater mounted to traverse a circular pat-h within said' casing, and an inserted liner within said casing adjacent the path of said beater,

vsaid liner having aV surface generated subtraverse a circular path, and a wall adjacent said.. beater path having a series of surfaces involute to and a second series ofvsurfa'oes tangent to said beater path, some ofthe portions of said wall bearin .the individual involute and tangent surfaces being spaced apart.

involute to said beater path, and having a second series of surfaces tangent to said beater path, said indivldual surfaces-of one' a in a pulverizer, a beaterinountedto traverse a circular path, and a Wall adjacent K, said heater path having a series of surfaces.

series alternating with individual surfaces of the other series, and'some of the portions of said wall bearing pairs of different surfaces being spaced apart.

ln pulverizer, a

beater mounted' 'to' traverse a circuiarlpath, and a-wall havingv adjacent said beater path atv least twoini veinte impact surfaces, said' surfaces being lccated so that tangents' to one portion of said beater path impact on the one involute surface and tangentsof an immediately ad-,r .jacent portion ofsaid beater path impact on the second involute surface.

' 6. In a pulverizer,"a,beater mounted to traverse a circular path, and a`wall.comprising spaced bars each having adjacent said:

beater path an involute impact surface, 'said surfaces ofsuccessi've bars being so located that tangents tooneportion of said beater?v path impact on the involute surface of one bar, and tangents to an immediately adjacent portion vof said` beater path impact on the invoiute surfacelof another bar.

In testimony whereof) the signature of the inventor is alixed hereto in the presence oftwo witnesses. A

CLIFFORD J. TOMLINSON., `Witnesses:

Cime. L. BYRON, W. l-l. LIEBER.

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