US2225095A - Screen for hammer mills - Google Patents

Description

m2. 17, 1940. F. BEVERLY Y 7 2,225,095

SCREEN FOR HAMMER MILLS Filed April 2'7, 1939 Patented Dec. 17, 1940 g v 2,225,095 r SCREEN FOR HAMMER mans.

Frank Beverly, Coleman, Ten, assignor of onehalf to Claud McClellan, Coleman, Tex.

Application April 27, 1939, Serial No. 270,417

1 Claim. (01. 83-11) i This invention relates to a screen for a hamsaid sections when the top member T is closed mer mill, and it is an object of the invention to surrounding and enclosing the rotor R together provide a screen of this kind provided with means with the hammers D. The assembled sections A to increase the capacity of the mill by the grindare circular in cross section and substantially 5 ing of feeds that would otherwise be thrown back concentric to the axial center of the rotor R.

to dry or which would ordinarily gum up or clog In the embodiment of the invention as illusthe mill. trated in Figure 1, each of the screen sections A Another object of the invention is to provide a is provided along its inner face with the bars I. screen with transversely disposed elements ex- Each of these bars is substantially co-exten'sive tending across the inner face of the screen to in length with the length of the section A and make the feed bounce and re-bounce whereby said bar I is welded to the inner face of the secthe hammers of the mill are given more hits at tion between adjacent rows of screen openings 2. the feed during the operation of the mill and The bar I is V-sh'aped in cross section with the thereby materially increasing the output of the apex thereof disposed inwardly from the section mill without any material increase in power. A and which apex a provides a sharp edge. The The invention consists in the details of conbars I are preferably equidistantly spaced in a 'struction and in the combination'and arrange-' direction circumferentially of a section A and ment of theseveral parts of .my improved screen are in parallelism.

for a hammer mill whereby certain important The rotor R rotates n the direction indicated advantages are attained and the device rendered by the arrow b' and as' the feed stream dlivered 2o simpler, less expensive and otherwise more confrom the chute'F is hit by the hammers D, the venient and advantageous for use, as will be bars I will cause the grain to bounce and rehereinafter more fully set forth. v bounce thus preventing grain slipping around The novel features of myinvention'willhereim, with the rotor. Thiscontlnuedi bouncing of the after be definitely claimed. l grain; plus the sharp edges a-in theircoaction In order that my invention may be the better with the hammers, results in the grinding oi understood, I will now proceed to describe the substantially all ofthe grain, thereby greatly insame with reference to the accompanying drawcreasing the output of the mill. In other words, ing, wherein: Y the particular construction'of the screen as here- Figure 1 is f ag t y Vertical sect onal in described is such as tomaterially reduce grain '30 view taken through a hammer mill disclosing a or feed that would have to be thrown back to UNITED ST T S PATENT orrica screen constructed in accordance with an em- .dry r which would otherwise gum up or clog bodiment of my invention; I the mill and greatly reduce its output.

F e 1 a ra entary v ew i p of t The bars I are made of hardened metal. inner face of the screen as herein'disclosed; In th b i t of my invention as par- 35 Figure 3 is a view similar to Figu e 2i ticularly illustrated in Figure 3, bars 3 are welded tra ins an ther mbodim nt of th v nti n; or otherwise secured to the inner face of the Figure 4 fl e ary S c l w taken screen section B and arranged in two rows side circumferentially of the screen and illustrating by i it th ars extending between adja- 40 another embodiment of the invention; cent openings 4 of the screen section B. The 40 Figure 5 is a view in perspective of the bar bars 3 of one row also alternate or stagger with illustrated in Figure 4, unapplied. respect to the bars 3 of the adjacent row.

In the accompanying drawing, H denotes the In the embodiment of my invention as illusupper portion of a rotor housing and which has trated in Figures 4 and 5, the screen C has 5 associated therewith the usual top member T. "bolted thereto,vas at 5, a readily removable angle Mounted as is well known within the housing H bar 6. This 'bar 6 is also of a length co-extensive and the top member T when closed is the rotor with the length of thescreen section Candwhen R carrying the usual hammers D. The rotor R applied has an upstanding flange I, the upper is to be driven in anymanner desired and at a portion of which is formed to provide a sharp sospeed preferred. Discharging within the housing edge]. a

H is a conventional feed chute F. From the foregoing description it is thought to As herein disclosed, the screen is cylindrical be obvious that a screen for a hammer mill conand comprises two substantially duplicate sec- StmOted'iIl accordance with my invention is partions A. one being arranged within the top memticularly well adapted for use by reason of the her T and the other within the housing H and convenience and facility with which it may be 1 "mil;

screen, members carried by the screen and extending'inwsrdly thereof. said members bein disposed lengthwise or the screen and hsvins their inner. edges sharp, llld members being 7 spaced apart in s direction circumi'erentially oi the screen with adjacent members in relatively close proximity, each of said members being positioned between adjacent rows oi openings, each of said'members being V-shsped in cross section with its apex inwnrdly disposed.

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