US971196A - Ball-mill or comminuter plate. - Google Patents

Description

I). HIBBARD.

BALL MILL 0R GOMMINUTER PLATE.

APPLICATION FILED MAR. 18, 1910.

Patented Sept. 27, 1910.

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MY D. HIBBARD, OF PLAINFIELD, NEi/V JERSEY.

. BAlLL-IVIILL OR. COMIVIINUTER PLATE.

"Specification of Letters Patent. Patented Sept, 2?, 1910,

Application filed March 18. 1910. Serial No. 550,112.

To all whom it may concern:

Be itknown that I, HENRY'D. HIBBARD, a citizen of the United States, residing at Plainfield, in the county of Union'and State of New Jersey, have invented certain new and useful Improvements in Ball-Mill or Comminu-ter Plates, of which the'following is a specification.

The present improvement relates to ball mills and lining plates therefor, the object of the invention being to provide,-in con; nection with an improved plate simple in construction and 'which may be so fastened to the shell that the distortion of the lining made up by these plates will be reduced to a minimum, so that the holding bolts for the plates will be relieved of a large part of the strain thereon due to the tendency of the plates to shift around the shell,-with means for preventing the bowing or bending of the plates in the middle, due to the stretching thereof, especially when such plates are made of unmachinableimetal, such for in? stance as manganese steel, the present invention being an improvement in part upon thatshown and described in the contemporaneously pending application of John M. Sherrerd, Serial No. 508,891, filed July 22, 1909-,

and with which I am familiar. v

In the drawings accompanying and forming part' of this specification, Figure 145 a View of a part of the shell, partly in section,

with some of these improved plates in position; Fig. 2 is a plan view of one of the plates; Fig. 3 is an end view of the plate corresponding parts throughout the figures of the drawing.

, known as ball mills, ball tube mills, comminuters and the like, the crashing and pulverizing device consists essentially of a cylindrical shell of metal, such as steel-or iron, arranged for rotation around acentral shaft or other point bf support. The shell is prohvided with alining, frequently. in'the form of steps or shelves from which drops the ma.

terial which is, being crushed and the balls or pebbles which do the crushing. The edge of one shelf. or step usually overlaps the edge of the next adjacent shelf or step, and these shelves or steps are sometimes made to extend the full length of the cylinder and are "frequently attached to the cylindrical wall of the shell itself by bolts or rivets, these shelves or steps being made eitheig in one or several pieces. WVhen the shelves or steps are. secured to the shell by bolts or rivets, which latter usually extend through the shell, es

.fpecially when these shelves or steps are made of unmachinable metal such as manganese steel, which, owing to its toughness and resistance to abrasive wear, is particularly 'well suited for this purpose, the shelvesor ste os-tend to distort under the blows of the bal s or crushing material and this tends to bring a somewhat greater strain on the bolts than is desirable, this being due in part to the ductility of the metal, which causes it to flow to a small extent and change shape, and thus, as stated, the shelvesor steps tend to distort under theblows of the balls or crushing material, so that the bolts not only have to hold the plates against the shell, but

also'have to resist the tendency of the lining to shift around the inside circumference of the shell. The present improvement is therefore intendegl not only to reduce this distortion of the lining to a minimum and so take the strain oil from the holding bolts,

but also to prevent the bulging or bending of the plates and thus assist in materially preventingthe strain upon the bolts In theprcsent embodiment of the invention theshell 2 is provided at intervals around the same, interiorly thereof, with a series of ribs or bars 3 riveted or otherwise secured on the inner wall of the shell. The

ball mill or con'ni'iinuter plate 4, usually prolug or shoulder 7 integral with the plate and located in position to rest against one of the ribs or bars on the shell. The plate is also provided adjacent to its opposite or toe end with openings 8 for the holding bolts or rivets 6. The plates are assembled so that the the shell, whereby -the strain on the bolts which secure the lining plates-to the shell is heel of one overlaps the heel of a companion greatly relieved by reason of the fact that any dlstortion of the plate under the blows oi theballs or crushing material will bereceived bythe ribs or bars of the shell instead'"of by the bolts, especially ,asthe toe endsinffthe plates are curved outward and so ifermed between. this integral shoulderand'the bolts that distortion of the plates.

tends to mor'eafirml-y cause the shoulder of each plate-to engage its rib, this being due somewhat to the fact that the curved toe end -of the plateis spaced from the rib in such. a manner that pressure on'the working face of gage its shell rib It'has'been found in practice, however, es-

the. plate causes the shoulder to firmly en- I peeiiillywhen the plate is made of manganese steel, which-has a tendency to flow or yield under the pounding action ofthe balls or other-pulverizing material, that the plates tend. to bow or bend,,which, of course, increases the strain upon the holdin bolts,

and I have discovered that by pro ding a .means' which will permit the stretching of the plates laterally this bending or bowing of the plates is avoided, and consequently considerable of the strain removed from. the

bolts. That is to say, the constant pounding of the balls on the plate tends tostretch'the surface transversely and raise it in the midf dle, and to overcome this I have provided each plate with means for taking up,-or compensating for, the stretching action. of the plateand this meansconsists'in the present improvement of a. groove 'or grooves 9 extending lengthwise in the working faceof the plates. The number of-grooves will depend of course entirely upon the width of the plate. These grooves, a pair of which .are lllustrated in the plate shown in thedrawing, extend from the toe end of the plate toward the heel end, preferably terminating just back of the slotted portion of the heel. In this improvement the plate is provided at the sides of the grooves with a series of parallel recesses 10, forming strengthening ribs 11, while the thickened portion of the plate is also provided with reinforcing ribs 12 formed by chambers 13. These chambers lighten the plate, especially at the thicker portions thereof, while the ribs materially strengthen it.

In practice the bolt holes 8 could be made somewhatelongated if. preferred, thereby to avoid strain being brought against the bolts when the plate is straightened out under the blows of the balls or pebbles.

The grooves may be filled with suitable soft metal, such as babbitt or zinc, which will not only act to-prevent the material being crushed from entering the grooves, but will not interfere with the stretchin action of the plates, since this soft metal: being located between comparatively hard metal, will yield and be compressed. Thus it will 'ing of the plate comprising be observed that the working surface of the plate isbroken up b one or.more grooves,

so that the plate, un er the pounding action of the balls, will be permitted to stretch or give without the bending'or bowing up of the plate'in the middle, and thus avo ding an extra strain upon the bolts, WlllCll otherwise would occur if the plate were bent up in the middle, so that by the provision of these grooves, instead ofthe plate raising or bending it will remain flat.

I claim as my invention 1. A one-piece lining plate having means therein comprising a groove or grooves for preventing the bending or bowing of the plate.

2. A one-piece lining plate having means therein for preventing the bending or bowone or more lengthwise extending grooves.

3. A one-piece hning plate having'inits working face a groove or grooves for pre-' venting the bowing or stretching of the plate and having on its non-working side one or more reinforcing ribs, opposite said groove or grooves, the groove or-grooves. terminat-- and provided with one/or more grooves extending partway through the plate for reventing the bending'or bowing of the p ate,

said grooves terminating at the toe.

6. A shouldered, reinforced, one-piece linin'g plate having therein one or more grooves for preventing the bending or bowing of the plate.

7. 'A shouldered and reinforced, one-piece lining plate, having in its working face one or more grooves extending partway through the plate lengthwise thereof for preventing the bending or bowing of the plate.

'8. A lining plate having a toe and a heel and between said toe and heel a transversely extending shoulder, and having one or more longitudinally extending grooves, each of said grooves being filled with a soft metal.

9. A lining plate having it'sworking face provided with means for preventing the bowing or-bending of the plate, said means comprising one or more grooves extending longitudinally of the plate and each of said grooves being filled with a soft metal.

10. A lining plate having a toe and heel and provided with one or more grooves for preventing the bending or bowlng of the,

plate, each of said grooves being filled with a soft metal.

11. A lining plate having a toe and heel,

and intermed'ate said toe and heel a shoulder,

and having in its working side one or more grooves each of said grooves being filled with a soft metal. a

from said bar and provided with a shoulder g adapted to engage said bar thereby to resist the distortion of the lining and relieve the strain on the holding bolts, said plate also it having ,means foipermitting the stretching of the plate and thereby' prevent the bending or bowing thereof, said means cor'ngrising one or moi-e grooves extending longitudinally of the plate andeach of sai grooves having soft metal therein.

HENRY D. HIBBARD.

Witnesses: 1

, F. E. BoYcE, "GEORGE F.

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