US1055686A - Pulverizer. - Google Patents

Description

M. F. WILLIAMS.

PULVBRIZER.

APPLICATION FILED JUNE 2, 1910.

1355,6861 Patented Mar.11,1913.

4 SHEETS-SHEET 1.

V/ITNESSES KW/Z W M. F. WlLLIAMS.

PULVERIZER.

APPLICATION FILED 3111132, 1910v 1,055,686. Patented Mar.11,1913.

4 SHEBTSWSHEET 3.

W/TNESSES m /N YEA/TOE M/uro/v F. Wmupms UNITE STATES PAT Enron.

MILTON F. WILLIAMS, 0]? ST. LOUIS, MISSOURI, ASSIGNOR TO WILLIAMS PATENT CBUSHER & PULVERIZER COMPANY, OF ST. LOUIS,

MISSOURI.

MISSOURI, A CORPORATION OF PULVERIZER.

To all whom it may concern:

Be it known that I, MILTON F. WILLIAMS, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Pulverizers, of whichsthe 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 accompanyingdrawings, forming part of this specification, in which Figure 1 is a side elevational view of my improved pulverizer partly in vertical section. Fig. 2 is an end elevational view partly in vertical section. Fig. 2 is a detail view of the means for adjusting the feed stroke. Fig. 3 is a top planview partly in horizontal section. Figs. 4, 5, 6 and 7 are detail views of modified forms of beaters.

This invention relates to a new and useful improvement in pulverizers, the object. being to construct a machine which will be a finisher, that is, one which in operating upon dry material will reduce the same to pulverulent form, so that it will pass through a. screen from one hundred to two hundred mesh fine.

The novel features of the present invention reside, briefly, in the construction of the hammers or beaters; the arrangement of the side feed; the provision of pockets to catch foreign materials; and the manner of controlling the supply and exhaustion of air to effect the discharge of material from the machine.

The invention consists in the construction, arrangement and combination of the several parts, as will hereinafter be described and pointed out in the claims.

In the drawings, 1 indicates a casting which is preferably anchored to suitable timbers 2 constituting the foundation or support. This casting constitutes a casing, in the peripheral wall of which are arranged two manhole plates 3 by which access may be gained to the interior. The outer part of the casting is provided with an opening, in which is arranged a removable casting 1 constituting a support for a screen frame 5 containing a wire mesh covering the discharge opening.

6 indicates a flanged ring cooperating with the screen frame to hold same in its Specification of Letters Patent.

Patented Mar. 11, 1913.

Application filed June 2, 1910. Serial No. 564,701.

seat, said ring in turn being held in position by blocks 7 adjustedly secured in position by means of threaded bolts 8 screwed fast to a support 8' in the casing, said blocks being loosely mounted on said bolts 8. By turning studs 9 screwed into blocks 7 and having heads bearing against the supports 8 the inner ends of said blocks may be forced downwardly to tighten the clamplng ring 6 in position.

10 is the discharge spout, which is preferably connected to an exhaust fan or blower.

To renew the screen, it is only necessary to loosen the bolts 9, to swing the blocks 7 on the bolts 8 and raise the flanged ring 6, whereupon the screen may be removed. If necessary, the pipe 10 may also be raised for the same purpose. The casting 4 which supports the screen fra'me is mounted to move in vertical .fguideways and provided with ribs 11 fitting in said guideways, said ribs having their lower ends beveled, as shown in Fig. 2.

12 is a bar having a beveled inner end to cooperate with the ribs 11, whereby, when clamping ring 6 is not firmly secured in poand outwardly to adjust the screen with relation to the paths of travel of the revolving beaters by means of bolts 12%. screwed in the casing. A bar 13 located above the bar 12, having a vertical inner face, is also made adjustable inwardly and outwardly by means ofa threaded bolt 13 screwed in the casing for clamping the screen in its vertically adjusted position.

Bars 12 and 13 are duplicated on each side of the screen, the bars 12 serving to support the casting 4 and its carried screen,

while the bars 13 serve to clamp'the samein position. The clamping blocks 7 force the flanged screen and associate parts downwardly. To adjust the screen downwardly, it is only necessary to loosen the bolts 12, to move the bars 12 outwardly, and tighten the clamping blocks 7. To adjust the screen upwardly, the clamping blocks are first loosened, then the bolts 12 rotated so as to move the bars 12 inwardly. Bolts 13*, which move the bars 13 inwardly and outwardly, may be turned to clamp and unclamp the casting 4.

Preferably, the bars 12 which control the position of the screen, have no connection sition, the bar 12 may be adjusted inwardly with the ring bars which are used for adj usting the grinding surface, but they form segments thereof, being mounted in the concentric grooves 1 inside the casing .containing said grinding surface. The rings for adjusting the grinding surface bars are oppositely inclined on their adjacent edges, and are movable inwardly and outwardly by means of bolts, in the same manner as the bars 12 and 13. The grinding surface is practically composed of bars 1 1 having serrations on their inner faces, the-ends of said bars being oppositely beveled, as shown in Figs. 1 and 3.- The outer rings 15 are made adjustable inwardly and outwardly by means of bolts 15 secured in the casing, while the inner rings 15 are made adjustable inwardly and outwardly by means of bolts 16 secured in the casing. By moving the outer rings inwardly and the inner ringsoutwardly, the bars are adjusted toward the heaters, the opposite adjustment of said rings eflecting the outward adjustment of said bars. Thegrinding surface bars preferably terminate under flanges 4 of casting 4, a space being provided beyond each end bar whereby, when the grinding surface is adjusted inwardly to take up wear, the diminishing circle will cause the end bars to move' in under the flanges of the casting 4.

Ordinarily the grinding surface, when the heaters are new and the points not worn, is positioned with the rings 16 in their innermost position and the rings 15 in their outermost position. As the heaters wear, the bars 15 are adjusted inwardly after retracting the rings 16. The retracting movement of the rings 16 controls the adjustmenuof the grinding surface, which, it will be observed, by moving the rings 15 and 16 in opposite directions, is effected in a positive manner both toward and from the heaters.

A strap or band 17 is arranged under the grinding surface at approximately the mid dle portion of the. bars to support the same, and this strap, which is sufficiently flexible to conform to the various adjustments of the grinding surface, has its ends supported by threaded rods 18 whose ends pass through the casting 1 and receive nuts for adjusting said strap.

19 is a shaftmounted in suitable bearings arranged in extensions projecting from the sides of casting 1, which extensions are covered by cap plates'20 bearing the partition walls provided in the extensions, which, with the cap plates, constitute an oil rereceptacle for lubricating the shaft in its bearings, by means of the usual slip rings. A screw 21 is provided to aline the shaft bearings. A driving pulley 22 is arranged on the end of the shaft, and if desired, a balance wheel can be arranged on the opposite end of said shaft.

noeaeae Within the'casting 1, the shaft has head plates provided with fanblades 23, which tend to draw in air and material from each side of the machine and force the same toward the center of its zone of heaters. The material is fed into the eye of the. machine around the shaft at each side through conduits 24, which conduits terminate at the extensions and adjacent to the partition walls thereof which form the oil receptacle. These conduits lead from under a feeding mechanism comprising a pocket cylinder 25 arranged in a suitable casing at the lower end of a discharge pipe 26. An adjustable wall 27 in said casing determines the amount of material passing beyond the cylinder When the wall is close to the cylinder 25, only that material which can enter the pocket is fed to the machine, whereas, by. adjusting the wall 27 outwardly, a larger quantity of material will be fed to the machine. The outer end of the shaft of the pocket cylinder is provided with a ratchet 28, with which cooperates a pawl 29 carried by an arm 30 provided with a T- groove, in which is adjustably mounted one end of an eccentric link 31. The adjustment of link 31 on the arm 30 can be effected by means of a threaded rod, as shown in Fig. 2 Theadjustment of this link is for the purpose of controlling the throw of the feed pawl. An eccentric 32, with its usual strap, to which link 31 is connected, is mounted on a counter shaft 33, whose pulley 84 is driven by a belt 35 fastened around a pulley 36. A conjoined pulley 37 is driven by belt- 38 which passes over shaft 19.

I do not claim broadly the feeding mechanism described above, as it forms the subject matter of a divisional application filed by me October 29, 1910, and serially numbered 589,T99.-

39 is a pocket or receptacle arran ed directly under the pocketfeed cylinder for the purpose of catching particles of iron or other foreign material too heavy for the air entering through dampers 4:0, arrangedat the end of said receptacle, to carry into the machine. Auxiliary air supply pipes 41, controlled by dampers 42, lead into the feed openings at the F eye of the machine on each side, for the purpose of affording better control of the amount of material fed into the machine. These auxiliary air supply pipes 11 lead from the bottom of the machine and tend to keep the same clear from dust or pulverized material escaping through the cracks in the bars of the grinding surface and which might tend to accumulate under the grinding surface. The space under the grinding surface forms a receptacle for catching material in the manner described, and is therefore preferably housed in, but, as shown in Fig. 1, this space communicates with the-exterior around the flanged ring 6. By this construction, air drawn through the pipes 41 passes downwardly around the bars of the grinding surface and draws all flying particles of dust escaping therefrom back into the machine, whence it will be discharged through the pipe 10.

Beaters 43, which cooperate with the grinding surface and act upon the material in the machine to reduce the same to pulverulent form, are preferably constructed by giving to said heaters a quarter turn, whereby the major axis of their outer ends lies substantially parallel to shaft 19. In this manner these heaters act as paddles. The outer flat ends of the heaters are curved forward and provided with cutting edges, which are preferably sharpened and may be formed by an inserted plate 4A shown in Figs. 4 to 7 inclusive. These plates 44- may be reversed when worn and renewed. The heaters are mounted on rods between supporting disks 45, and have extensi ons 4c3 which cooperate with the hubs of sald dlsks to prevent the heaters from falling forward, when the machine is at rest, and dulling their edges. These extensions do not interfere with the rearward yielding movement of the heaters in operation.

The operation .of the machine in reducing material to powdered form is as follows: The material to be reduced is supplied to the feed pipe 26 and fed in predetermined quantities to the machine. The machine being in operation, the fan blades 23 serve to draw the materiah-Iwith air, into' the machlne, through the feed openings around the shaft 19, said feed openings acting in this particular like the eyes of a fan. Fan blades'23 tend to throw the material toward the center of the zone of revolving heaters. Centrifugal force tends to throw the material outwardly a ainst the grinding surface. The curved at blades of the heaters tend to pick up the material from the grinding surface by a scooping action and return the material toward the center of the machine in opposition to the direction in which the material is inclined to move under centrifugal force. The broad juxtaposed heads of the heaters form flights extending longitudinally of the cage upon which the material being acted upon is carried and moved about the circumference of the cage. The material is thus reduced, not only by contacting with the grinding surface and the heaters, but by attrition, the oppositely moving particles rubbing against each other, so that ultimately they are of sufficient fineness to be passed through the screen and into the discharge pipe 10, which is preferably connected to an exhaust fan. The passage of the material through the screen and the action of the heaters in tending to wipe the material off this screen, is similar to that of the well known Griflin mill, the fine particles of material being bolted diagonally.

I am'aware that minor changes in the construction, arrangement and combination of the various parts of my device can be made and substituted for those herein shown and described without departing from the nature and spirit of my invention.

I do not in this application claim the means for adjusting the screen or the grinding surface, as the same is the invention of Edward H. Frickey, and forms the subjectmatter of a companion application filed of even date herewith.

hat I claim is:'

1. In a pulverizer, the combination of chamber having a grinding surface, a shaft mounted interiorly thereof, supports on said shaft, heaters pivotally mounted intermediate their ends on said supports, having their outer ends twisted so as to lie substantially parallel to said shaft, the twisted portions of said heaters forming channels to move the material laterally of and toward the axis of rotation of the heaters, and being provided with forwardly projecting terminal scooping and cutting edges.

2. In a pulverizer, the combination of a casing having a concentric grinding surface,

with a discharge opening arranged in the length of said grinding surface, feed conduits leading into the eye of the machine from opposite sides, and conduits connecting the discharge opening with the feed conduits.

3. In a pulverizer, the combination with a casing, a perforated grinding surface ar ranged therein surrounded by an air space which communicates with the exterior at the top of the casing, a feed conduit connected with the casing, and a duct connecting the lower portion of the air space with said feed conduit.

4. In a pulverizer, the combination of a casing, a perforated grinding surface arranged therein and surrounded by an air space which communicates with the exterior at the top of the casing, a feed conduit leading into the eye of the pulverizer, and a duct connecting the lower portion of said space with said feed conduit, said duct being provided with a damper.

5. In a pulverizer, the combination of a casing containing reducing mechanism, a supply pipe for material, a feed mechanism arranged in the vertical portion of said supply pipe, a pocket or receptacle for foreign particles located at the lower end of said vertical portion, and branch pipes leading to each side of the machine from a point above said pocket or receptacle and entering the casing at its axis.

(3. In a pulverizer, the combination of a revolving shaft, beater supports arranged ing projecting thereon, comprising a series of disks havhub portions, heaters pivot ally mounted etween said disks, said heaters having inwardy extending portions engaging the hub portions of the disks to prevent undue forward movement of the heaters.

7. In a device of the class described in combination, a substantially air tight casing, 'a grinding cylinder mounted withinopenings at the ends of said grinding cylinder, and substantially air tight conduits connecting said discharge conduit and said feed openings.

8. In a pulverizer, the combination of a grinding cage, a shaft passing through said cage, beaters mounted on said shaftand adapted to cooperate with said cage, said heaters having broad head portions disposed close to one another so as to form a flight extending longitudinally of the cylinder, and said head portions being provided with anterior scooping edges adapted to cooperate with the cage, said cage being provided with a screened discharge opening in its periphery.

9. In a grinder in combination, a casing, a foraminous cage therein, said casing being provided with a chamber for the reception of ground material passing through said cage, rotary beaters within said cage, a feed chamber communicating with said cage, a conduit connecting said feed chamber with said chamber for ground material, and a fan within said casing adapted to draw material through said conduit.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses,

this 24th day of May, 1910.

MILTON F. WILLIAMS. Witnesses:

l\I.P. SMITH, B. S. REID.

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