US1194757A - lovett - Google Patents

Description

T. J. LOVETT.

GRINDING MILL. APPLICATION FILED APR-M1912. RENEWED JAN. 20. 1916.

Patented Aug. 15, 1916.

4 SHEETS-SHEET I- T. J. LOVETT.

GRINDING MILL. APPLICATION FILED APR. 4-. 1912. RENEWED JAN. 20, ms.

1,194,757. PatentedAug. 15,1916.

4 SHEETS-SHEET 2- T. J. LOVETT.

GRINDING MILL. APPLICATION FILED APR- 4,1912- RENEWED 1AN.20,I9I6.

1,1 94,757. Patented Aug. 15,1916.

HEET 3.

e5 6615, a? Q N iveizrr T. J. LOVETT.

GRINDING MILL. 7 APPLICATION FILED APR- 4.1912 RENEWED IIAN. 20.1915- 1.,1 94,757. I Patented Aug. 15, 1916.

4 SHEETS-SHEET rinrrnn s'rarns THOMAS J. LOVETT, OF CHICAGO, ILLINOIS,

risers-non TO oorrnn raocnss COMPANY,

OF CHICAGO, ILLINOIS, A CORPORATION OF SOUTH DAKOTA.

GRINDING-MILL.

Application filed April 4, 1912, Serial No. 688,365.

To all whom it may concern:

Be it known that I, THOMAS J. Lovn'r'r, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Grinding-Mills, of which the following is a specification.

My object is to provide a grindingmill of improved construction adapting it for the rapid and economical reduction of ore, and other more or less friable material, to a fine mesh or state of division.

It is also my object to provide a mill particularly well adapted forthe treatment, by a torsional rubbing action, of or containing ductile metal in flaky condition, whereby the flakes are twisted into lumps to facilitate their separation from the gangue, in accordance with the method of treating ore described in Letters Patent No.97 9,180, granted to me December 20, 1910.

In carrying out my invention, in the form herewith illustrated, I provide lower and up per members having flat more or less smooth and cooperating grinding-faces. The grinding-members may be plates of chilled iron or steel and are formed preferably of removable and replaceable sections or segments. The lower member rotates and the upper member reciprocates, whereby material fed between them, through the upper member, is moved in the direction of the periphery of the lower member and subjected, for a more or less prolonged period, to a torsional rubbing action under pressure which rapidly triturates silicious constituents of the ore and rolls and twists and tends to agglomerate any flaky ductile metallic constituents.

The present invention constitutes a modification of the invention set forth and generically claimed in my application No. 731,455, filed November 14, 1912, for a concentratepreparing machine.

In the accompanying drawingsFigure l is plan view of a grinding-mill, of large size. and great capacity, constructed in accordance with my invention; Fig. 2, a similar view with one-half the lower grindingmembers, and the upper reciprocating grindingmember and its frame removed; Fig. 3, a broken side elevation of the machine on a somewhat larger scale and with the surrounding collecting trough removed; and Fig. 4, an enlarged section taken on line 4 in Fig. 1.

Specification of Letters Patent.

Patented Aug. 15, 1916.

Renewed January 20, 1916. Serial No. 73,181.

In the construction shown, the stationary parts of the machine rest upon and are secured to a foundation frame formed of I- beams 5.

The reference numeral 6 designates a central stationary bearing-sleeve for a vertical shaft 7. Secured to the upper end of the shaft is a disk-shaped grinding-member supporting-bed 8 formed on its underside with a bevel-gear 9 and an annular inclined bearing surface 10, and formed on its upper side with a peripheral flange or rim 11 and a central, flanged boss or hub 12.

Mounted in bearings 18, on the foundation frame, is a shaft 14 carrying a bevelgear 15, driving the bevel-gear 9, and a large gear 16 driven by a pinion 17 on a drive-shaft 18. The shaft 18 is journaled in bearings 19 on the bed frame and carries a pulley 20 to which the driving power is applied. The lower grinding-member 21 is of disk-shape and formed of a plurality of closely fitting segments, as illustrated in Fig. 2. The upper surfaces of the segments are more or less smooth and each segment has on its under side an inner lip or flange 22, to receive the flange of the hub 12, and an outer flange 23 fitting into the flange 11. The grinding-member 21 and its supporting disk or bed 8 are held against independent rota-- tion by a key 24. The rotating bed or disk 8 is supported upon rollers 25 journaled in bearing-frames 26 mounted on the foundation frame 5. The rollers 25 have inclined faces conforming to the inclined bearing face 10 which rides thereon.

Secured upon the foundation frame are four standards 27 carrying inwardly extending, horizontal bearing-rollers 28 and vertical guide-rollers 29. Riding upon the roll ers 28 between the guide-rollers 29 is an angle-bar frame 30 for the upper grindingmember 31. This grinding-member is made up of a plurality of sections each consisting, preferably, of a metal plate formed with flanges 32 fitting within the vertical sides of the angle-bars 30 and extending over the horizontal sides thereof, as shown most plainly in Fig. 4. The sections which form the upper grinding-member 31 may fit together in the frame or the frame may be divided into pockets adapted to receive the individual sections. In Fig. 1 these pockets and sections are shown to be five in number, the central one being twice the size of those at the ends. The side bars of the angle-bar frame 30 are tied together at op; posite ends by the cross-braces 33.

Journaled in three alincd bearings 34, on the foundation fame, is a rock-shaft 35 keyed to which is a pair of upwardly eX- tending rocking arms 36, 37. The shorter arm 36 is connected through a pitma'n 38 withan eccentric 39 on the shaft 14-, and the longer arm 37 is connected through a pitman l0 with the adjacent end-brace 33 of the frame 30. The end of the pitman 38 may be adjusted up and down in a slot 36 in the arm 36, by means of a screw 36 to change the throw of the arm, and parts moved thereby, with reference to the eccentric 39. Changing the distance of throw of the reciprocating frame is one way of varying the speed of movement of one grinding-member relative to the other. The central section of the upper grinding-member 31, as illustrated, carries a hopper ll which in practice may extend beneath the feed spout of a crushed-ore supplying bin, not shown. The hopper 41 is mounted in a downwardly flaring feed-opening 42 through said central section.

In operation power applied to the pulley 20 turns the shaft 18 and through the gears 17, 16, turns the shaft 14 and the gear 15 and eccentric 39 carried thereby. The engagement between the gears 15 and 9 causes the bed or disk 8 and lower grinding-member 21 to be rotated at desired speed. At the same time the eccentric 39 through the pitman 38 rocks the arm 36, shaft 35 and arm 37 to reciprocate the frame 30 on the supporting rollers 28 between the guides 29.

per member the crushed ore fed into the hopper ll is subjected under pressure to trituration from different directionssimultaneously, the direction of movement being at approximately right angles to each other. This action aided by the movement of the ore pieces or particles against each other has the effect of rapidly breaking up the more friable ganguc and releasing therefrom the metallic constituents, and of subjecting the latter furthermore to a torsional rolling and twisting action which quickly changes any ductile metal of a flaky character into lumps of slug, pellet or analogous shape. It furthermore has the effect, to quite an extent, of agglomerating ductile metal clusters, and separate particles, into lumps of pellet or analogous shape. The tendency of the upper and lower grinding-members is to I cause the ore as it is triturated to move of the incoming ore. If the ore as fed to the machine is mixed with water, as is usual, the latter also tends to wash the ore, as it is being ground, in the direction of the periphery of the lower grinding-member. In the drawing, T have shown a gradually depending collecting trough 44 around the lower member leading to a chute 4:5 for collecting and carrying off the ground product.

In the treatment of very hard ore which is difficult and slow to grind, the central section only of the upper grinding-member may be provided with the downwardly flaring feed-opening 42, the other sections being unprovided with such openings. F or grinding more friable ore each of the sections may be provided with, preferably, downwardly flaring feed-openings L2 fitted with hoppers like the hopper l1, or other means for directing the ore thereto. The machine illustrated may therefore have live separate and distinct feeds whenever the action of the grind ing-members is suflicient to suitably treat the ore in a comparatively short distance of travel thereof between the members.

The machine shown and described has great capacity for the treatment of ores and particularly those of a friable nature; and the power required per ton of ore treated is comparatively low, for the reason that the entire area of at least the upper grindingmember isin constant grinding action. The wear upon the grinding surfaces of the members is substantially uniform throughout, and no furrows or ridges will appear therein. Thus the sections of the members may be worn almost through before it is necessary to renew them. The sections of the upper member are, for convenience in lifting them out of and placing them into position, provided with perforated upardly extendinglugs 43. The sections of the upper grinding-member are as to the pressure they exert independent of each other and as they become worn weights may be placed thereon. In the treatment of certain ores it may be desirable to give to the central section greater weight per square inch of grinding surface than the other sections, which may be done by placing weights thereon. Thus ore in its initial treatment may be subjected to greaterweight than during its after treatment, where all the ore is fed through the central section.

The foregoing description is intended to convey a clear understanding of my improvements in what I now believe to be the best form of their embodiment, and no un due limitation should be understood there- 7 from. It is my intention to claim all that is novel in my invention, in view of my above-entitled application.

What I claim as new and desire to secure by Letters Patent, is p p 1. In a machine of the character set forth,

the combination of a revoluble lower grinding member having a flat upper surface and equipped with a gear, a horizontal driveshaft equipped with a driving pinion engaging said gear, a reciprocable upper grinding member having a flat lower surface and supported by and movable upon and across the revoluble member, guides restraining the upper member against turning, a rock-shaft disposed at a distance from said drive-shaft and connected therewith and actuated thereby, and connecting means between said rock-shaft and said upper grinding member.

2. In a machine of the character set forth, the combination of a revoluble lower grinding member having a flat upper surface and equipped with a gear, a horizontal driveshaft equipped with a driving pinion, engaging said gear, a reciprocable upper grinding member having a flat lower surface and movable upon and across the revoluble member, guides for said upper member, a rock-shaft disposed at a distance from said drive-shaft, an eccentric on the drive-shaft, connecting means between the eccentric and said rock-shaft, and connecting means between said rock-shaft and said upper grinding member, the rock-shaft having one arm of adjustable length, whereby the throw of the upper grinding member with relation to the lower grinding member may be varied.

3. In a machine of the character set forth, the combination of a revoluble lower grinding member having a flat upper surface and equipped with a gear, a horizontal driveshaft equipped with a driving pinion engaging said gear, a reciprocable upper grinding member having a fiat lower surface and movable upon and across the revoluble member, guides for said upper member, a rock-shaft disposed at a distance from said drive-shaft, an eccentric on the drive-shaft, an actuating arm 011 the rock-shaft, a connecting rod connected with the eccentric and adjustably connected with the said arm, a second arm on the rock-shaft, and connections between said last-named arm and said upper grinding member.

THOMAS J. LOVETT.

In presence of L. HEISLAR, R. SCHAEFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, I). C.

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