US1485618A - Gyratory ore grinder - Google Patents

Description

Patented Mar. 1, 1924.

warren stares LEWIS MARTIN KELLOGG, OF SOUTH PASADENA, CALIFORNIA.

GYRATORY ORE GRINDER.

Application filed January 19, 1920.

To all whom it may concern.

Be it known that I, Lnwis MARTIN KEL- LOGG, a citizen of the United States, residing at South Pasadena, in the county of Los Angeles and State of California, have invented new and useful Improvements in Gyratory Ore Grinders, of which the following is a specification.

My invention relates to improvements in ore grinders in which the gyratory principle in common use in rock-breakers is applied for the grinding of broken .ore to sands and slime and an object of my invention is to make a gyratory mill of such form that a sands or a slime product may be had fromit; a second object being to provide a certain flow of the feed water through the mill whereby the finely ground ore particles from all parts of the Zone in which the grinding is done will be classified upwardly to an overflow discharge, and a third object being to so form and arrange the grinding elements that the ore will not be crushed between steel surfaces directly but rather ore will be crushed upon ore in a bed compressed between steel crushing surfaces.

The invention consists of the novel fea- More specifically 1 indicates a mortar heavy walled and having a removable bot tom plate 2. The mortar is surrounded with an annular discharge channel 8 and has an overflow discharge rim 4.

Within the mortar is positioned a steel wearing liner 5 having an upper and a lower crushing ring 6 and 7 and air-intermediate channel 8 of larger diameter forming part of a grinding zone.

A water inlet conduit 9 is connected to the bottom plate at the center and communicates with the interior of the mortar by a plurality of ports 10.

An ore feed hopper 11 is fixed to the back side of the mortar and has a spout 12 leading through the wall thereof and into the intermediate channel 8.

Secured to lugs 13 on the topof the mortar is a spider 14 in which is formed an Serial No. 352,260.

eccentric bearing 15 disposed concentric with the mortar.

Within the bearing 15 is rotatably mounted an eccentric 16 having anouthanging driving pulley 17 and an eccentric rectangular cavity 18. Within the cavity 18 is positioned blocks 19 and 20 in which is formed a socket bearing.

WVithin the mortar is placed a gyrator 22 carrying a steel shell 23, the shell being formed with an upper ring 24 opposing the ring 6 of the mortar liner and a lower ring 25 opposing the lower ring 7 of the mortar liner, and having an intermediate channel 26 opposite the channel 8 of the mortar liner.

The gyrator is provided with a spindle 27 having a ball 28 at its upper end adapted to-journal in the socket formed in the blocks 19 and 20.

In the practical operation of the device a power belt over the pulley 17 will rotate the eccentric 16 and gyrate the gyrator 22 through the spindle 27. In its movement the upper ring21 of the gyrator will approach the upper ring 6 of the mortar on one side while the lower ring 25 of the gyrator will approach the lower ring 7 of the mortar on the opposite side.

If then ore, which has been previously broken to about one inch and finer, is fed to the mortar through the hopper 11 and spout 12 the ore will fill the intermediate zone 8, 26 and work into the crevices between the upper and lower sets ofrings.

It is not intended that the crushing rings shall contact with each other but that they shall approach to within a proper distance so that the ore pieces will form a bed between the rings and so that the ore pieces will, to a certain extent, be crushed upon other ore pieces rather than between the steel surfaces directly. I i

The crevices between the'upper and lower sets of rings open and close in a rotating cycle and the ore is not only ground between the rings but the ore pieces filling the intermediate zone 8, 26 are also continuously in motion all around the mill, being alternately compressed and released.

Simultaneously with the grinding of the ore water is entered into the mortar through the ports 10. The water passes outwardly from under the gyrator and upwardly through the crushing zone all around the mill discharging over the rim 4:. The water in its passage up through the ore carries with it that part of the ore which has been ground fine enough to classify out of the crushing zone and be buoyed up by the ascending current. 1

The fineness of the product delivered by the mill will depend upon the height of the rim 4 and the amount of feed water admitted. By this means a closely classified product is delivered.

The gyrator is suspended in the mortar and its gyrations may not be perfect or uniform, that is, the gyrator may, on account of extra heavy duty imposed on one side or the other between the top or bottom rings, be thrown off center or move too far to one side or the other and all such eccentricities of gyration are accommodated in the ball and socket bearing in the eccentric 16.

The ore is crushed in this mill. in a manner similar to the breaking of rock in the conventional gyratory rock breaker except that in the latter the ore is broken along the spindle between the eccentric and an outer pivotal bearing, thus employing a leverage of the second class, while in the present invention the pressure of the lower crushing ring on the ore is used as a fulcrum to effect a crushing of the ore at the upper ring, thus crushing the ore at two points and using a leverage of the first and second class.

The grinding action in the intermediate zone is effected in a manner similar to that set up in a conventional tube mill in which the larger ore pieces sliding upon each other grind themselves away and the smaller pieces between them.

The feed of ore to. the mill is effected through the spout 12 and the movement of the ore in the intermediate zone influences the ore in the spout so that the ore continually works down into the mill as fast as there is room for it.

The hopper 11 is carried up to a level above the rim 4 so that the mill water filling into the spout will not overflow by that means.

The hopper may be supplied with ore from a mechanical feeder or from an in.- clined chute and if from the latter the ore simply fills into the hopper and works down into the mill as fast as the mill disposes of it, thus forming an automatic feed.

It is to be understood that air may be entered into the mill in place of the feed water and the mill run as a dry grinder, the air acting to classify upwardly the fines as fast as the mill produces them. Such an arrangement, it is obvious, would necessitate the use of an exhaust fan and a settling chamber to carry away from the mill and collect the pulverulent product.

With some trouble and at the sacrifice of simplicity the gyrator may be inverted and the spindle extended through the bottom of the mortar as is the common practice in gyratory rock breakers, but the construction as herein shown is preferred and various other changes might be made in the structure of the mill and the arrangement of the several parts without departing from the spirit of the invention as claimed.

Having thus described my invention I claim:

1. In combination in a gyrator-y ore grinder, a mortar having a removable wearing liner comprising an upper and a lower grinding ring properly spaced to form a wide intermediate grinding zone, a gyrator disposed freely and floating in the mortar and having a removable wearing shell comprising an upper and a lower grinding ring adapted to oppose the upper and lower grinding rings of the mortar liner, the rings being properly spaced to form a wide intermediate grinding zone, means for feeding ore pulp to the mortar, means for admitting to the mortar a fluid vehicle for the pulverized ore, and means for gyrating the gyrator.

2. In combination, in a gyratory ore grinder a mortar having a removable wearing liner comprising an upper and a lower grinding ring properly spaced to form an intermediate grinding zone, a gyrator disposed freely in the mortar and having a removable Wearing shell comprising an upper and a lower grinding ring adapted to oppose the upper and lower grinding rings of the mortar liner, the rings being properly spaced to form an intermediate grinding zone, means for feeding broken ore through the wall of the mortar into the in termediate grinding zones, means for admitting to the mortar a fluid carrier for the pulverulent product, and means for gyrating the gyrator.

3. In a gyratory ore grinder, in combination, a mortar having an. inner wearing liner and comprising an upper and a lower grinding ring spaced apart, a gyrator suspended freely in the mortar and having a wearing shell comprising an upper and a lower grinding ring adapted to oppose the upper and lower grinding rings of the mortar liner, means for operating the gyrator, means for admitting water to the mortar and means for feeding ore to the mortar.

4. In combination, in a gyratory ore grinder, a mortar having an overflow discharge and having a removable wearing liner comprising an upper and a lower grinding ring properly spaced to form an intermediategrinding zone, a gyrator disposed freely and floating within the mortar and having a removable wearing shell comprising an upper and a lower grinding ring adapted to oppose the upper and lower grinding rings of the mortar liner, the rings being properly spaced to form an intermediate grinding zone, means for operating the gyrator, a feed water inlet for the mortar, an ore feed port connecting through the wall of the mortar and through the liner into the intermediate grinding zone between the upper and lower grinding rings and means for feeding ore to the mortar through the port.

5. In a gyratory ore grinder in combination, a mortar having an overflow discharge and having a removable wearing liner comprising an upper and a lower grinding ring properly spaced to form an intermediate grinding zone a gyrator disposed freely and floating within the mortar and having a removable wearing shell comprising an upper and a lower grinding ring adapted to oppose the upper and lower grinding rings of-the mortar liner, the rings being properly spaced to form an intermediate grinding zone, means for passing a classifying fluid upwardly through the grinding zones and between the rings and towards the overflow discharge, means for gyrating the gyrator and means for feeding broken ore to the mortar.

6. In combination in a gyratory ore grinder, a mortar having an inner wearing liner comprising an upper and a lower grinding ring, a gyrator suspended freely in the mortar and having a wearing shell comprising an upper and a lower grinding ring adapted to oppose the upper and lower grinding rings of the mortar liner, an ore inlet port extending through the wall of the mortar and between the upper and lower sets of grinding rings, a water inlet for the mortar and means for operating the gyrator.

7 In a gyratory ore grinder, in combi nation, a mortar, a removable wearing liner for the mortar having an upper and a lower grinding ring spaced apart, a gyrator adapted to gyrate freely in the mortar and a removable wearing liner for the gyrator having an upper and a lower grinding ring adapted to oppose the upper and lower grinding rings of the mortar liner.

8. In combination in a gyratory ore grinder, a mortar having an inner wearing liner comprising an upper and a lower grinding ring, a gyrator suspended freely in the mortar and having a wearing. shell comprising an upper and a lower grinding ring disposed so as to oppose the upper and lower grinding rings of the mortar liner, an ore inlet port extending through the wall of the mortar and between the upper and lower sets of grinding rings, a water inlet for the mortar positioned below the sets of grinding rings, an overflow discharge rim for the mortar and means for operating the gyrator.

9. In combination in a gyratory ore grinder, a mortar having a removable wearing liner, an ore inlet port formed through the wall of the mortar and through the wearing liner, a gyrator adapted to gyrate in suspension in the mortar and having a removable wearing liner opposing the wearing liner of the mortar, an overflow discharge rim for the mortar, and a water inlet means positioned in the bottom of the mortar.

In testimony whereof I have signed my name to this specification.

LEWIS MARTIN KELLOGG.

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