US1258969A - General grinder. - Google Patents

Description

M. F. WILLIAMS. GENERAL GRINDER. APPucAnoN FILED MAY 9. 1914.

rrnn srn'rns r frana* FFME MILTON F. WILLIAMS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO WILLIAMS -PATENT CRUSHER AND PULVERIZER COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION 0F MISSOURI.

To all whom it may concern.'

Be it known that I, MILTON F. WILLIAMS, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in General Grinders, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompany-l ing drawings, forming part of this specification` My invention relates broadly to mills 0r pulverizers of the rotary hammer type, and

lhas as its general object the provision of a.

durable and eilicient grinder adapted for usage such as the reduction of granular material, like grain, bones, fertilizer, etc., or fibrous material, such as alfalfa, pea hay, corn stalks, etc.

More specifically, the invention relates to certain improvements in rotary hammer mills whereby certain parts of the mill are interchangeable for` the purpose of adapting it to different uses, and also whereby the capacity or reducing eiiiciency of the mill is increased. A

Other and further objects of my invention will be obvious or hereinafter pointed out, reference being had to the accompanying drawings forming part of thisspecification, in which- Figure l represents a sectionall elevation showing a mill arranged for the reduction of granular material. p

Fig. 2 is a sectional elevation showing the mill arranged for the reduction of fibrous material.

Fig. 3 is a perspective of the granular breaker plate.

Fig. 4 is a perspective of the interchangeable cage section.

Fi 5 is a perspective of the breaker plate for brous material.

By reference to the drawings in detail, it will be understood that 1 represents the machine casing, 2 a cover which may be suitably hinged thereto. Secured to the cover 2 is a throat casting 3 provided with separate inlet openings for the purposes hereinafter to be described. 4 is a rotary shaft carryirngthe hammer mounts 5, upon which are pivoted the hammers 6.

In Fig. 1, 7 represents the grinding cage Specication of Letters Patent. Patented Mar, 12, 1918,

Application led May 9, 1914. Serial No. 837,445.

which may be of any desired sort, the same being suitably mounted on the frame 1, preferably by means of the side frames 8 which rest on proper seats formed in the end walls -of the casing. A breaker plate 9 is adjustably mounted on the frame 1 in position to coperate with the hammers 6. Material is fed to the action of the mill from the hopper 10 through the throat 11, the feed being controlled by a suitable valve 12.

The parts so far described are all well known in the art, and need not be described further in detail. i

The machine as illustrated in Fig. 1 is suitable for the reduction of such materials as can be fed into the grinding chamber from the hopper 10. Such materials, of course, are limited to those which will feed freely, -due to their form, size, or weight, such as grain, rock, commercial fertilizer, and similar materials, which for the purpose of designation, I will arbitrarily term granular materials. This arrangement is not adapted, however, to the reduction of the sorts of materials which I will arbitrarily designate fibrous materials,, such as alfalfa, pea hay, corn stalks, and similar more or less 'comparatively light and bulky materials which are not adaptedr to feed to the action of the beaters from the hopper 10. To accommodate the mill to both uses, a Very important consideration in mills of this sort which are designed for sale to farmers who have a wide variety of uses for it, the mill is equipped with the substitite Y is disposed intermediate the breaker plate 9 and the cage 8, forming substantially a continuation of the latter.. As illustrated, the removable cage section has the screen 16 carried on the end frames 17, which rest in suitable seats on the side w-alls ofthe casing 1, the cross frame 18 which is designed to contact with the terminal cross frame of the cage 8, and the top plate 19 which extends to the front wall of the casing and forms a. suitable supporting surface for the mounting of the lbreaker plate 9. The removable cage section may be inserted or removed by swinging back the cover on its hinge, whereby accessto the infor the reception of the so-called fibrous materials, the breaker plate 9 and its mounting are removed, thus leaving the front feed opening 20.` The removable cage section 15 is removed, and in its `place is substituted the substitute breaker plate 14. The substitute breaker plate is formed with the lateral supports 2l lwhich are designed to rest in the same seats on the sidewalls of the casing l 'which support the side frames 17 of the removable cage section. On the lateral supports 21v is supported the impact plate 22, which, when in postion in the mill, extends from the forward edge `of the cage 7 to the front Wall of the casing 1, being 'u 20 is suitably secured to the mill casing, and

forms a guideway or chute through vwhich the fibrous material may be fed through the front feed opening 20. A depending lip 23 is formed on the feed-boardf24 in position 25 'to extend across the top of the feed opening 20, the same operating to prevent material belng thrown out of the feed opening 20 by the hammers.

'Ihe mill equipped as illustrated in Fig.

2, is adapted to reduce material which ordinarily will not feed with proper facility from the hopper 10, the arrangement providing a wide flaring feed opening through which the material readily passes'into the grinding chamber. When so arranged, the feed hopper 10 is cut off from the grinding chamber by closure of the valve-.12,

In the reduction of most material, and vparticularly in the reduction of light mate` 40 rials, such as grain, alfalfa hay, etc., there is a certain tendency of the material 'to race around `with the, beaters both before it is reduced sufficiently fine to pass through the cageor screen and after it is suliiciently reduced, the whirling of the beaters tending to hold the material in suspension. In order to prevent this racing ofthe Vmaterial and to facilitate the passage of the reduced `material through the screen, thereby increasing the capacity or grinding eliciency of the mill, I provide the upper or bolting screen 25 which is supported withinv the casing above the grinding cage 7 and' disposed on a radius greater than that of the cage 7 relative to the shaft 4. Disposed at suitable intervals on the bolting-screen 25,

' and extending thereacross between theside frames 26', I place the baille plates 2,7, which project inwardly toward the shaft adjacent the orbital ath of the beaters. The effect of these ba e plates is to produce eddies outside the orbit of thebeaters, in whichthe light reduced material is carried beyond the rotary influence of the beaters and 'against 6.5; the bolting screen 25 through which it beaters, and means for exhausting the air passes out ofthe grinding chamber and'into the discharge hopper 28. r

The discharge hopper 28 has outlet to a suitable suction fan. by way of the conduit 29, the arrangement being such as to provide a reduced pressure in the interior of the casing 1 which produces a suction from the interior of the grinding chamber through the cage' and screen. The air is returned/from v the fan to the interior of the grinding chamber by way of the pipe 30, the arrangement tending to produce a pressure within the grinding chamber which` finds outlet through the foraminous cage andv screen. The baille plates 27 coperate in this ar rangement, vas above described, by enabling the reducedmaterial to free itself from the racing influence of the rotating beaters. Likewise the baflie plates 27 provide places for lodgment of the unreduced material so as to prevent its being carried around ine'ectively by the beaters.

From the foregoing, it will be seen that my invention relates to certain improvements in the structure of rotary hammer 9o mills whereby the adaptability of the mill is greatly increased, and its grinding capacity increased.

I am aware that various changes and modifications in the forms illustrated and 95 lfrom the spirit and scope of my invention,

and therefore, it is not my intention that I be limitedV to the specific forms shown and described.

1What I claim is:

1. In a grinder, the combination of a casing, rotarybeaters, a foraminous cage within the/casing adapted to hold material to the action of said'gfjlaters, said cage having its upper portion -oflset'relative to its lower portion and spaced apart from the casing, a baiile plate extendlng'from said offset toward the operating orbit of the from the casing about Ithe offset portion of the cage. a

2. In a grinder, rotary beaters, a perfo#l rate cage mounted for cop'eration therewith and having a portion offset from the beaters, a baflie plate mounted on the olfset portion of said perforate cage in position to cop. erate with said beaters, and a casing inclosing the cage and spaced apart from the ofi'- set portion thereof.

. `3. In a grinder, the combination of a casing, rotary beaters,'a cage disposed within thecasing for coperation with said beaters, the upper portion of said cage being foraminous and offset relative to the orbit of 126 the'beaters and spaced away from the casing, and baffle plates mounted within said offset portion and' having coperative relationship with said beaters.

4. In a grinder, the combination of a cas- 130 ing, a forminous 'grinding cage mounted In testimony whereof I-hereunto aiiix my therein, a shaft carrying rotary beaters signature, in the presence of two Witnesses, l v adapted lto coperate with said grinding this 24th day oApri1,'1914=.

cage to reduce material, baiile plates mount- TON F. WILLS. 5 ed o n portions of said foramnous grinding Witnesses: i

cage adjacent the orbit of said beaters, and M. P. SMITH,

means for exhausting air from the casing. C. S. BUTLER.

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