US1024414A - Vertical tubular mill for fine grinding. - Google Patents

Description

- G. MOREL.

VERTIGAL TUBULAR MILL FOR PINE GRINDING.

\ APPLICATION FILED SEPT. 14, 1910. 1,024,414.

Patented Apr. 23, 1912 piG-B- 2/ m 1 a I 163 3 6?, ff I 4 1 e f 3 fie 5 e a 1* {Z l 5' a. e A; l 5 5 5 5 g &T L 1 6 FlG.2.

CHARLES MOREL, OF DOMENE,

ISERE, FRANCE.

VERTICAL TUBULAR MILL FOR FINE GRINDING.

Specification of Letters Patent.

Patented Apr. 23, 1911.2.

Application filed September 14, 1910. Serial No. 582,022.

To all whom it may concern.

Be it known that 1, CHARLES MOREL, residing at Domene, Isere, France, a citizen of the Republic of France, have invented certain new and useful Improvements in Vertical Tubular Mills for Fine Grinding, of which the following is a specification.

This invention relates toa vertical tubular mill for fine grinding, characterized by an arrangement by which the material to be ground is not in contact with the balls except in the grinding area, whereby the power required is considerably reduced as compared with the tubular grinding mills in which the balls move surrounded by the mass of material, thus giving rise to very considerable friction, a large part of which is not utilized in the grinding.

The invention is illustrated in the aocom panying drawings, in which- Figure 1 is a vertical section through the axis thereof. Fig. 2 a horizontal section through 22 in Fig. 1. Fig. 3 is a partial vertical section, the movable interior platforms and the balls being left as seen from outside.

The mill comprises a cylindrical casing a mounted on a base 7), in which the driving gear is placed, and which is closed at the top by a cover 0, this form of constructlon enabling the apparatus to be taken to pieces without difficulty. In the axis of the cylindrical body thus mounted is a vertical shaft d supported at its lower end by a socket a? and maintained by bearings (Z at the top and at the bottom of the cylindrical body. On this shaft d superposed platforms 9 are fixed which form compartments by means of which the balls e are maintained and guided which roll and are applied by centrifugal force to the fixed rims f adjusted in the cylindrical body a.

The arrangements of the ball-carrying platforms and of the rims f is peculiar the characteristics thereof which are explained hereafter, insuring the efiectiveness of the grinding.

Each of the platforms 9 comprises a lower part 9 forming a platform properly speak ing on which the balls lie, and radial parts g forming compartments of a general triangular shape, for example six in number, as in the drawing. In three of the compartments are placed three balls and the three others which alternate with the former do not receive any balls. This number of compartments and of balls might moreover be any other provided that the total number is even and that the compartments alternate as just explained.

In the compartment with balls, the balls are covered by a horizontal wall 9 in such a manner that when the whole device rotates the balls roll against the track or rim f the material to be ground which falls at- 03 only arrives in the region of the balls adj acent to the grinding track and thus the whole body of the ball is not wrapped in the material to be ground as would be the case if the upper wall 9 did not exist, and if the material tobe ground could fall over the whole area of the compartment containing the ball. The result is a considerable reduction in the power required and much less wear.

The compartments not occupied by the balls have an upper surface g slightly inclined from the center toward the periphery. This surface which comes near the grinding track f is intended to receive the material to be ground that falls from above and to distribute it along the track, where the ball, which arrives soon after, crushes it. The openings seen at g are intended to reduce the quantity of metal necessary for having the surface 9 at a suitable height and the surfaces which they form also serve for throwing the material into the grinding track.

Between the tracks f and the superposed platforms 9 partitions or diaphragms i are interposed which have a central opening 2" the object of which is to regulate the fiow of the material from one stage to the other.

It will be seen from Fig. 1 that these diaphragms are interposed between the lower platform 9 of the upper stage and the upper surfaces 9*, g of the lower stage, in in such a manner that the material falling from the upper stage must pass through this central opening z" of the diaphragm in order to reach the stage below. The speed at which the material flows depends on the sectional area of this orifice i in the diaphragm, and, consequently the fineness of the grinding can be regulated at will by employing diaphragms having larger or smaller central openings. The material is conveyed to the upper part of the apparatus by a pipe 7%. It is conveyed to the first grinding track as explained above; then, it reaches the diaphragm 2' as indicated by the arrows, and pours through the central opening 2" in the diaphragm on to the second grinding stage, Where it is conveyed, distributed and ground in the same manner as before, and so on to the last stage, whence it is conveyed outside through the p-assagej The transmission of motion to the shaft (Z is effected by means of two bevel gears 7a 76 arranged in a closed chamber containing an oil bath formed by the base I) and the shaft Z with its pulleys Z.

This apparatus may of course be constructed with any number of stages and any number of balls per stage, While the characteristic arrangements described are still preserved.

hat I claim and desire to secure by Letters Patent is:

1. In a ball-mill for fine grinding, the combination of a vertical casing, annular grinding tracks and a revoluble shaft therein, stages mounted on said shaft and provided with radial compartments opening on said tracks, alternate compartments having top-closures and containing grinding balls adapted to roll against said tracks under action of centrifugal force, the said remaining compartments of each stage being adapted to receive and deliver material to said grinding tracks.

2. In a ball-mill for fine grinding, the combination of a vertical casing, annular grinding tracks and a revoluble shaft therein, stages mounted on said shaft and provided with radial compartments opening 3 on said tracks, alternate compartments having top-closures and containing grinding balls adapted to roll against said tracks under action of centrifugal force .and partitions in each of said remaining com- 4 partments adapted to facilitate the delivery to said tracks of material received by each compartment.

3. In a ball-mill for fine grinding, the combination of a vertical casing, annular 4 grinding tracks and a revoluble shaft therein, stages mounted on said shaft and provided with radial compartments opening on said tracks, alternate compartments having top-closures and containing grinding balls adapted to roll against said tracks under action of centrifugal force, partitions in each of said remaining compartments adapted to facilitate the delivery to said tracks of material received by each compartment, and diaphragms intermediate said stages having central openings for regulating the fineness of the material ground. In testimony whereof I have aifixed my signature, in presence of two Witnesses.

CHARLES MOREL. WVitnesses:

JEAN OHRISTIN, COILLAT LEON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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