US2128727A - Pulverizer - Google Patents

Description

Au so, 1938.

C. T. ELDERKIN PULVERIZER Filed June 28, 1937 'INVENTOR. 6'44: 7'. .ELDERK/N.

W) [ITO KNEW.

" Patented Aug.30, '193 8 UNITED STATES PATENT. OFFICE runvnnrzaa Clair '1. Elderkin, Sacramento, Oalif., assignor to Irven T. Miller, Woodland, Galif.

Application June 28,1937, Serial-No. 150.735 I 6 Claims.

vide a number of improvements in the type of mill l struction'.

More particularly it is proposed to provide for a better control of the air currents passing through the mill whereby a more generous amount of air is.

made to circulate through the mill and eddy cur-'- rents are by-passed and made to join the main current so that all dead air pockets are avoided. It is further proposed to arrange the rotor or beater in the machine in such a manner that the material under treatment is evenly distributed g through the housing.

It is further proposed in the present invention to provide means on the rotor for dragging hay from the entrance into the housing whereby the feeding of the hay is improved particularly where the hay is fed in the form of bales, or shows a tendency to bunch at the entrance to the housing It is a further object of my invention to provide improved mounting means for the motor whereby the weight is balanced to better advantage than in existing mills.

And finally it is proposed to provide certain improvements in construction whereby the mill is simplified andmore easily assembled.

l Further objects and advantages of my inven- I tion will appear as the specification proceeds.

The preferred form of 'my invention is illustrated in theaccompanying drawing in which- Figure 1 shows a vertical transverse section 5 through my mill,

v Figure 2'an axial section taken along line 2-2 of Figure 1, and

Figure 3 a detail view of a heater and associated parts as seen from line 3-3 of Figure 1.

, 50 While I have shown only the preferred form of my invention I wish to have it understood that various changes or modifications may be made within'the scope of the claims hereto attached Rassuin AUG 1940 that the features of my invention are not conflnedto an alfalfa mill but may be used in connection with any material having similar characteristics,

Referring to the drawing in detail, my milli 5 may be supported on any suitable base. 2 which is hereillustrated a's composing four angle iron's 3 arranged in rectangular relation and joined by a plate 4. The mill comprises a housing 5 and a rotor 6 confined in the same. i

The housing is made of two end plates I and 8 rising vertically from the base in spaced and parallel relation and being secured thereto by means offlanges 9 and iii. The plates are of I identical form and each comprises a rectangular body'section II and a tapered top section l2. Between the plates is supported the shell of the housing comprising a semi-cylindrical section l3, vertical sections it and IS rising from the upper edges of the semi-cylindrical section and inclined sections i6 and i1 tapering toward one another and terminating in a restricted outlet it, which latter connects, through a conduit i8, with a cyclone collector not shown.

In manufacturing the pulverizer, 1 preferably make the semi-cylindrical section IS, the vertical sections l 4 and i5 and the inclined sections it and I! in one piece, referred to as shell i9, and the latter is clamped between the rear plate 8 and-the front plate I by a series of bolts 28 surrounding the shell as shownin the drawing.

In the housing is supported a screen or perforated plate 23 which is semi-cylindrical inform and is secured to the vertical shell sections it v and i5 by means of bolts-2| in such a manner 3 that it complements the lower semi-cylindrical section to form a complete cylinder. a

The rear plate 8 is preferably made with a re-' movable middle section 8'for facilitating the in sertion and removal of the screen.

' It will be noted that the inclined shell sections l8 and I! are spaced from the screen sufllciently to form pockets 24 and 25 respectively, and in order to control and-provide an outlet for eddy cmrents that may form in those pockets, I provide two baiiles 28 and 21 which'run parallel to the inclined shell sections it and "and the walls of the outlet It so as t6 form'by-pesses 28 and 29. The baflies-are welded to the front plate I and contact the rear plate 8.

Inside of thecylinder I -provide the rotor or. heater .6 mounted on the shaft 80. The rotor comprises a flat plate 8|, mounted-seas to becloser to the rear plate 8 than to the front plate l, as shown in Figure 2, and having a'plurality 5 plate during its rotation.

The front plate has a large entrance opening ll which connects with a trough 35 which latter is preferably inclined to feed hay into the mill by gravity. In order to facilitate the feeding, particularly of baled hay, I provide a number of prongs 38 on the rotor, the prongs being arrangedopposite the opening so as to tear into the hay projecting through the opening and to drag the hay into the mill. The prongs are preferabiy arranged at difierent distances from the axis of rotation so that they attack the different points. v

The shaft 30 is mounted, outside of the housing, in: bearings 31 and carries, at its outer end, a pulley wit to which power may be applied in hay at any suitable manner. It will be noted that the.

pulley and the rotor are mounted on opposite sides of the bearings so that they tend to balance one another.

4 'Iheoperation of the mill should be readily understood from the foregoing description. The hay is fed, loose or in bales, over the trough into the cylinder. If the hay is closely compressed, as in bales, or otherwise bunched, the prongs It. of the revolving rotor will tear it up and drag it into the mill. "The beaters then act on the hay to puiverize it; At the. same time a draftof air, is set up, the air coming in through the opening 84 and being discharged through the scrum which latter is of relatively thin material and holds back portions of the hay which have not been sufliciently, reduced.

' The normal tendency of the air, which carries the pulverized material along with it, is to discharge in tangential direction. Since the rotor rotates clockwise, (see Figure l) the laden air will first discharge into the pocket 24 and through the by-pass 28 which lies practically in the normal path of air discharged by centrifugal force.

A d'urther portion of the air will, of course, discharge into the main channel of the discharge conduit, that is into the hood formed by the bailles 26 and 21.

lbs major part of this air will also move upward. A remaining portion of air, finally, will reach the pocket 25 but, instead of returning into the mill, will be drawn upward into the by-pass "on account of suction created by the air forced through the conduit '8. Thus air may be dis- 2 charged through practically the entire screen area to insure a free flow and with such a large exhaust area available, the intake may be increased correspondingly, as compared with mills now on the market.

The angular position of the heaters serves to better distribute the material throughout the mill.

Where straight blades are used I 'flnd that usually only the front portion of the mill renders eifecing from the edges of the bottom section and inclined sections rising from the vertical sections and tapering to a restricted-outlet, a semi-cylindrical screen arranged in the housing complementary to the bottom section and forming pocketswith the side sections and means for bypassing eddy currents formed in the pockets into the outlet.

drical screen extending between the end walls with its concave face presented downwardly in complementary relation with the'bottom section and coacting with the latter to define a cylindrical reducing chamber; the screen forming pockets with the side sections; means for introducing material into the reducing chamber; a rotor in the reducing chamber having beate'rs thereon; and a pair of baflles mounted in substantially parallel relation with the inclined housing sectionsand coacting therewith to provide by-passes leading directly from the pockets to. the housing outlet; the baiiles being spaced from each other to define a main outlet therebetween.

3. ha pulverizer; a housing havingend walls,; .a semi-cylindrical bottom section, vertical side sections rising from the bottom section, and inclined sections rising from thevertical sections and tapering to a restricted outlet; a semi-cylindrical screen extending between the end walls with its concave face presented downwardly in complementary relation with the bottom section and coasting with the latter to define a cylindrical reducing chamber; the screen forming pockets with the side sections; means for introducing material into the reducing chamber; a rotor in the reducing chamber having beaters thereon; and a pair of babies mounted in substantially parallel relation with the inclined housing sections and coacting therewith to provide by-passes leading directly from the pockets to the housing outlet; the bailies being-spaced from each other to define a main outlet therebetween; the main outlet having a greater cross-sectional area than either. by-pass. V

'4. Ina pulverizer; a housing having end walls. a semi-cylindrical bottom section, vertical side sections rising from the bottom section, and inclined sectionstrising from the vertical sectionsand tapering to a restricted outlet; asemi-cylindrical screen extending between the end walls with its concave face presented downwardly in complementary relation with the bottom section and coacting with the latter to define a cylindrical reducing chamber; the screen forming pockets with the side sections; means for introducing material into the reducing. chamber; a rotor in the" reducing chamber having beaters thereon; and a pair of battles mounted in substantially parallel.-

relation with the inclined housing sections and coacting therewith to provide by-passes leading directly from the pockets to the housing outlet;

. the bailles being spaced from each other to define a'main'outlet therebetween the lower ends of the a-semi-cylindrical bottom section, vertical side sections rising from the bottom section, and inclined sections rising from the vertical sections v 2,128,787 and tapering to a restricted outlet; a semi-cylindrical screen extending between the end walls with its concave face presented downwardly in complementary relation-with the bottom section and coacting with the latter to define a cylindrical reducing chamber; the screen forming pockets with the side sections; means for introducing ma terial into the reducing chamber; a rotor in the reducing chamber having beaters thereon; and a pair oif bailies mounted in substantially parallel relation with the inclined housing sections and ooacting therewith to provide by-passes leading directly from the pockets to the housing outlet; the baijlles being spaced from each other to define a main outlet therebetween; the housing and 'banies being symmetrically disposed on opposite clined sections and tapering to a restricted outlet; a semi-cylindrical screen extending between the end walls with its concave iaee presented downwardly-in complementary relation with the bottom section and coasting with the latter to define a cylindrical reducing chambenjzhe screen forming pools-'- rising from the vertical sections ets with the side sections; means for introducing U material into the reducing chamber; a rotorin the reducing chamberhavingbeaters thereo and a pair 01 bailies mounted in substantially parallel relation with theinclined housing sections and coacting therewith to provide by-passes leading directly from the pockets to the housins outlet; the battles: being spaced from each other to define a main outlet therebetween; one end wall having a removable section extending above and below the screen to allow lateral removal of the screen.

cum r. Emnaxm. m

Images