US442974A - Ore-pulverizer - Google Patents

Description

(No Model- 2 Sheets-Sheet 1.

JLlmrnrf. --ORE PULVERIZER.

(No Model.) 2 Sheets--Sheet 2. .A HENDBY. ORL14 PULVERIZER.

No. 442,974. Patented Dec. 16, 1890.

` @mi/kwamen UNiTED STATES Afrnivr trice.

ARTHUR HENDEY, OF DENVER, COLORADO.

ORE-PULVERIZER.

SPECIFICATION forming part of Letters Patent No. 442,974, dated December 16, 1890.

Application led June 4:, l890| Serial N0. 354,200- (No model.)

To @ZZ whom t may concern.-

Be it known that I, ARTHUR HENDEY, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Ore-Pulverizers; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to that class of orepulverizing mills wherein the ore is crushed and pulverized by centrifugal action augmented by spring-pressure of rapidly-rotated rollers working within an annular chamber; and the invention has for its object to provide improved means for hanging the rollers, whereby the spindles of the same will be protected from the action of the ore and the rapid wear attendant thereto, while the rollers will at the same time be permitted to swing and rotate freely, and will be held to their work by a spring or yielding pressure in addition to the centrifugal force.

The invention further has for its object to provide the machine with rollers of improved construction, in order that they may more effectually resist wear, and also to so construct the annular chamber wherein the rollers rotate as to better withstand the action of the rollers, and to provide for readily repairing the walls of said chamber when required, as more fully hereinafter specified.

The above-mentioned objects are attained by the means illustrated in the accompanying drawings, in which- Figure l is a vertical section of a pulverizing-mill constructed according to my invention. Fig. 2 is a plan of the same, and Fig. 3 is also a plan showing spring connecting roller-shafts and main driving-shaft.

A is a circular pan, constructed of castiron, preferably, and mounted on a suitable base B. rlhe said pan is formed with a central hollow standard or boss O, which has a bearing D for the upper part of the vertical driving-spindle F of the machine, the lower end of which extends below the pan and is stepped in a bearing-block G at the center of therbase of the mill. The spindle is connected with any suitable motor by any apprved gearing,

as a miter gear-wheel H, which intel-meshes with a miter gear-pinion I, mounted on a horizontal shaft K, journaled in bearings L at the base of the mill. The pan A at its upper outer edge is flanged, as indicated at M, and on said flange is secured by bolts or otherwise the lower edge of an upper cylindrical section N, the said section being provided with openings P, which are covered with reticulated material, to screen the pnlverized ore, as more fully hereinafter explained. The said upper section is formed or provided with au annular trough R on the outside to receive the disintegrated ore as it is discharged by the centrifugal action of the crushingrollers.

The upper end of the spindle projects above a central boss or standard C and has keyed or otherwise secured to it a skeleton carrier S, consisting of a rotary disk of such size as to move freely in the upper circular section of the mill. The said carrier at its outer edge and at its center surrounding the central standard or boss of the pan is provided with downwardly-extendin g lian ges 'l and U, which deflect the pulverized ore thrown upward by the rollers back to the pan during the action of the machine, the central flange protecting the bearings of the spindle from the pulver'- ized ore, which would soon out the bearingsurfaces and render frequent repairs necessary.

The arms V of the skeleton carrier S are provided with openings, as shown,and .above said openings hemispherically-socketed bear ing-blocks X are bolted or otherwise secured tothe upper surfaces of the said arms. In said socket-ed bearingsarelooatcd and adapted to move with a universal motion balls Y of the roller-carrying spindles Z. The spindles are of peculiar construction, and with the balland-socket connection form an important feature of my invention. Each of said spindles Z is formed with annular grooves a for a suitable distance from its lower end, and the grooved portion is surrounded by Babbitt or similar anti-frictioii metal, the same being inclosed within a split sleeve U3. Each of the rollers is provided with a hollow projectiony b2, which fits snugly upon the sleeved portions 793 and holds the parts thereof firmly in contact with the Babbitt lining. The projections b2 are threaded at their lower ends externally IOO to [it the central iniernally-screw-threaded openings in the rollers and flanged to limit the extent of their entrance into the rollers and form a secure connection with the same. The outside of each projection bzis accurately turned and slightly tapered, so as to loosely fit and freely rotate within a skirt c, formed integrally with each ball, the skirt extending nearly to the bottom of the projection, so as to prevent the entrance of pulverized ore to the tu rnin g-surfaces and the consequent wear thereof. The roller-spindles are secured in the balls by means of bolts (Z.

The rollers I3 are constructed each with a core of soft iron and with an exterior band 0f hard or chilled iron, which permits the said rollers to be readily bored and threaded for the reception of the projections b2, the chilled surfacing-bands adapting the rollers to withstand to the greatest possible extent the wear to which they are subjected during the operation of the machine. The surfacing-bands are secured to the rollers preferably by means of bolts lil', having right-angled extensions F at their lower ends and nuts G at their upper ends, by means of which they are tightened in their seats; but other means may be employed without departing from my invention.

In order to enable the annular chamber in which the rollers travel to resist to the greatest possible extent the wear to which it is subjected and to provide for conveniently repairing the walls thereof, the said chamberis provided with an internal annular wall H of chilled metal, and to prevent such extremely hard but very brittle metal from being' broken the same is re-enforced by one or more bands of wrought-iron, which may be shrunk on or otherwise secured, and the annulus as thus constructed is wedged or otherwise secured within the pan.

Any number of rollers may be employed in the machine. In the present instance three are represented, and in the spaces between the rollers are secured to the carrier a series of arms I, provided with sweeps K at their lower ends, which carry and distribute the ore in the mill during its operation. The skirt of each of the balls forming the socketconnections of the rollers is provided at one side with an offset Il', having an eye, into which is hooked one end of a drag-link N', the other end being secured loosely to an eyebolt I, secured to the carrier, so as to drag` the rollers properly as they are rotated.

In order to assist the centrifugal action or increase the outward force of the rotating rollers, I extend the roller-spindles some distance above their sockets to obtain leverage and connect them together, or connect them with the central driving-spindle by tensionsprings R R', as shown in Figs. 2 and 3. By using these springs, applied as shown and described, the speed of rotation may be greatly reduced, and the force of impact of the particles aga-inst the screens, and conseeinem' quent wear of screens, is also reduced to a minimum. The slower the motion the better the work, provided there is sufficient force to crush the ore. Rapid rotation causes the rolls to jump and bound against the ring, causing bad work and great wear of the ring and rolls. It is found that tension-springs are much better for holding the rolls to their work than compressed springs. It is also found that the ball-and-socket connection requires the drag-link in order to obtain the best results.

The operation of my invention is similar to the operation of other mills of the same class. The ore being fed into the mill through suitable openings and the central shaft being rapidly rotated, the rollers will be thrown outward centrifugally, and by the tension of the springs crushing and pulverizing the Ore against the inner sides of the pan, while the centrifugal action will cause the pulverized ore to rise and pass out through the screenopenings and the annular surrounding trough. Vhen water is used during the operation, it carries the lighter portions of the ore over the edges of the annular surrounding trough, leaving the heavier metallic portions behind, which maybe amalgam ated and collected upon copper plates in well-known Ways. Those portions of the ore which contain metallic salts of value, but which will not unite with or be amalgamated by the mercury, may be collected and utilized by any ot' the processes of reduction in common use.

Having now described myinvention, what I claim isl. In a mill for pulverizing ore, the combination, with the carrier thereof, of the spherically-socketed bearings secured to the upper side of the said carrier, the balls located in said bearings and provided with integral downwardly-extendin g skirts, and rollers having projections fitted so as to rotate within said skirts, whereby the bearing-surfaces are protected from the pulverized ores, substantially as specified.

2. In a mill for pulverizing ore, the combination, with the carrier, of the ball-and-socket connections, the spindles secured to the balls and grooved as described, the split sleeves connected with said spindles by a filling of Babbitt or other similar metal, and the rollers having central projections iitting over the spindles, substantially as described.

3. In a mill for pulverizing ore, the combination, with the externally threaded and `flanged projections, of the rollers having softiron cores into which the projections are screwed, and surrounding bands of chilled metal secured thereto by locking-keys, substantially as described.

4. In a mill for pulverizing ores, the combination, with the skirted balls carrying the spindles of the rollers, of the drag-bolts connecting the skirts of the balls tothe carrier, substantially as and for the purposes set forth.

5. In a mill for pulverizing ores, the combi- IOO IIO

nation of a vertical driving-spindle, a pan said upwardly-extending spindles for holding ro having central bearing for said spindle, and the rollers to their Work by a yielding pressa rotary roller-carrierhaving the downwardlyure, substantially as described. extending ianges T and U to confine the ore In testimony whereof I affix my signature in 5 to the mill, substantially as described. the presence of two Witnesses.

6. In a mill for pulverizing ores, having a ARTHUR HENDEY. series of oentrifugally-aeting rollers, the oom- Witnesses: bination of spindles extending above their G. L. HUDSON,

sockets and tension-springs connected with C. A. CHIsHOLM.

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