US1041783A - Apparatus for grinding ores and other materials. - Google Patents

Description

H; W. HARDINGE. APPARATUS FOR GRINDING oRE's AND OTHEE'MATERIALS.

APPLICATION FILED 001. 19, 1910. 1,041,783. Patented Oct. 22, 1912.

A j/W I hi4, WQJAqM ATTORNEYS UNITED STATES PATENT OFFICE.

HARRY W. HARDINGE, OF NEW YORK, N. Y., ASSIGNOR T0 HARDING-E CONICAL MILL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

, Patented Oct. 22, 1912.

Application filed October 19, 1910. Serial No. 587,850.

To all whom it may concern:

Be it known that I, HARRY \V. HARDINGE,

a citizen of the United States, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Apparatus for Grinding Ores and other Materials, of which the following is a full, clear, and exact description.

This invention relates to tube mills, ball mills, pebble mills, and the like, and its chief object is to provide an improved mill which shall be capable of reducing the hardest and most refractory materials to an almost impalpable powder, or when mixed with water, to slime. To this and other ends the invention consists in the novel features of construction and combinations of elements hereinafter described and claimed.

Convenient and effective embodiments of the invention are illustrated in the annexed drawing, in which Figure 1 shows in longitudinal section'a form in which the material is fed in at one end of the mill and is discharged at the other. Fig. 2 is a longitudinal section showing a mill in which the material to be ground is delivered at the center of the mill and discharged at each end.

In the form shown in Fig. 1 the barrel or drum, designated by 1, is preferably cylindrical, and is provided with hollow trunnions 2, 3, rotatably mounted in suitable supports 4, 5, suitable means being provided for rotating the barrel, as for example a gear 6 adapted to mesh with a power driven gear or pinion not shown. Inside of the barrel or drum, adjacent to the inlet trunnion 2, is a hollow cone 7 arranged with its apex directed toward the outlet trunnion and having at such apex an outlet or discharge opening 8. This hollow cone constitutes in effect a partition, dividing the drum into two compartments or chambers, 9, 10, and by reason of the conical shape of the partition it performs the function of sizing the pieces or lumps of material, permitting only the smaller pieces to escape into the second chamber, as will be more fully described hereinafter. The mill may be used for either wet or dry grinding, in the former case a stream of water being kept flowing through the drum from the inlet to the outlet. Also, suitable grinding or crushing bodies may be used to aid in reducing the material, or, if desired, such bodies may be omitted, leaving by the impact and attrition of its own pieces or lumps upon eachother.

In the operation of the mill shown in Fig. 1 the material is introduced through the inlet trunnion 2 by means of a suitable supply pipe 2 into the chamber 9 which is separated from chamber 10 by the conical outlet port-ion 7. In this conical chamber the material assorts itself according to size, the pieces or lumps being largest where the chamber has the greatest diameter and grading in size toward the outlet 8, where the smallest pieces find their way out into the second chamber, after the manner described more in detail in my prior Patent No. 908,861,- issued January 5, 1909. In the second chamber the small particles or pieces delivered by the conical chamber are again subjected to impact and attrition among themselves as Well as among the balls, pebbles, or other crushing or grinding bodies when such are used,. with the result that by the time the outlet 3 is reached the material is reduced to the desired fineness.

In Fig. 2 the mill is in effect double, two conical partitions, 7 7 being provided at the center of the barrel or drum 1 In this case the material is introduced through a feed pipe 11 projecting through either trunnion 12, 13, and is discharged at a point between the two conical portions. The material then assorts itself, grading in size toward both outlet openings 14, 15. There are thus, in effect, two conical chambers, and two outer chambers in which the final grinding or reducing is performed, the material issuing from both trunnions 12, 13.

The mill described is particularly advantageous for grinding hard or refractory ores, but it can be used with markedly good results for reducing other materials, as for example materials for making cement, as well as ores of a less refractory nature.

I prefer to construct the apparatus as herein specifically illustrated, but it is to be understood that the invention is capable 'of embodiment in other forms without departure from its proper spirit and scope as defined by the appended claims.

I claim:

1. In a mill for the purpose described, in combination, a drum having hollow trunnions at its ends, conical partitions mounted inside the drum providing conical chambers the material to be ground or reduced solely.

therein and having discharge openings at their apexes, a feed pipe for supplymg material to be ground and extending through one of the apexes of the conical partitions,

and. means for rotating thedrum and coniing, a conical partition arranged with its apex toward said outlet opening of the drum the base thereof connected to said drum and dividing the same into two compartments, the exterior of said conical portion constituting the end wall of one compartment.

4. In a mill for the purpose vdescribed, in combination, a drum having an outlet openbase of the conical rectly to the drum said conical portion con- 31 ing and an inlet, a conical partition having 2,

an opening in said apex, arranged with said apex toward the outlet opening and dividing the drum into two. compartments, with the ortion connected di;

stituting the ments.

5. In a mill for the purpose described, in combination, a drum havlng hollow trunend walls of the two compartnions at its ends, a conical partition mount- 31 ed inside the drum and dividin the latter into twocompartments, means or directly discharging material to be treated into one of the compartments, and means for allowing the treated material to issue from both ends of the drum.

In testimony whereof I afiix my signature in the presence of two subscribing witnesses.

HARRY w. HARDINGE. Witnesses 2 i M. Lawson DYER, S. S. DUNHAM.

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