US909286A - Ore-grinding machine. - Google Patents

Description

G. A. DENNY.

01m GRINDING MACHINE.

APPLIOATION FILED JUNE 18, 1907.

Patented Jan. 12, 1909.

ms mmms PETERS co., WASHINGTON. nc,

-j T FFQE.

GEORGE ALFRED DENNY, OF LONDON, ENGLAND.

ORE-GRINDING MACHINE Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed June 18, 1907. Serial No. 379,633.

To all whom it may concern:

Be it known that I, GEORGE ALFRED DENNY, a subject of the King of Great Britain and Ireland, and resident of Salisbury House, London W'all, London, in the county of London, England, have invented certain new and useful Improvements in Ore-Grinding Machines, of which the following is a specification.

This invention relates to grinding machines, and has specially in view certain improvements in the type of grinding machines known as cone and shell machines in which rovision is made for utilizing the centrifuga force of the machine to assist in feeding the material, thereby dispensing, to a large extent, with the use of water.

With the above and many other objects in View, the invention contemplates certain novel features of construction and combination of parts which will. be described in de tail in the following description, pointed out in the claim, and illustrated in the drawings.

In said drawings, wherein a preferred embodiment of the invention has been shown, Figure 1 is a side elevation of the machine showing its connection with the source of power and also the manner of feeding ma terial to the grinding members. Fig. 2 is a top lan View of the same. Fig. 3 is a part sectlonal view of the structure shown in Fig. 1. Fig. 4 is a detail view of the connection between the grinding cone and its operating shaft. Fig. 5 is a detail view of the operat ing shaft showing its connection with the guiding sleeve.

Like characters of reference refer to corres onding parts.

n the accompanying drawings, 10 designates a suitable base which has mounted thereon a frame composed of side members 11-11 and a to connecting horizontal member 12 provided with a central opening 13. Said frame, which will be hereinafter referred to as the lower frame, forms a base support for an upper frame which is of similar construction as the lower frame, but of asmaller size, and comprises the two side members 14-14 and top connecting horizontal mem ber 15 provided with a central opening 16 in alinement with the opening 13 in the lower frame.

The grinding mechanism of the machine is composed of two hollowed inverted cone shaped members 17 and 18, res ectively. The cone shaped grinding member 18 is mounted on the base 10 and has an inlet formed in its lower extremity or apex, as at 19 which is in communication with a feeding pipe 21 which conveys the material to the said member 18. The members 17 and 18 are of such a size as to permit of one being freely revolved within the other, and as shown in the preferred construction, the member 18 is a stationary one, it being held in rigid engagement with the .base 10 by means of the ribs 22. Each of said members is provided with grinding teeth 2324, respectively which are held on the surfaces of the members by means of bolts or the like 25, in such a manner as to permit of their being readily removed when desired or A vertically arranged drive or operating shaft 26 has a keyed connection 27 with a guiding sleeve 28, and said shaft, with its connected sleeve extends through the opening in each of the upper and lower frames, suitable bearings 2930 being interposed between the sleeve and the sides of the openings to reduce friction. The keyed connection between the shaft and its guiding sleeve is arranged longitudinally and is of a loose nature which permits of the shaft being adjusted vertically with reference to said guiding sleeve, but a relative rotary movement of the two members will be prevented.

The lower portion of shaft 26 projects beyond the top member of the lower frame and at its extreme lower end a rectangular frame 31 has two of its diametrically opposite sides pivotally connected thereto. A supporting truss or beam 32 incloses said rectangular frame 31, and is arranged to engage and be pivotally connected with the side members of said frame that are not connected with the end of the shaft. The outer ends of said beam or truss are connected with the head of the grinding cone 17. The form of connection between the truss or beam and the end of the shaft forms what is known as a gimbal joint, and provided for a universal movement of the grinding cone 17 to compensate for wear etc. upon the grinding surface thereof.

The portion of the guiding sleeve 28 within the upper frame has fast thereon a horizontally arranged beveled gear wheel 33 with which meshes a vertically arranged bevel pinion 34: carried by a horizontal shaft 35 which projects through and has bearing within one of the side members of the upper frame, the outer end of said shaft carrying pulleys 36-37, which may be connected with a suitable source of power.

The upper end of the vertical shaft has a hollow threaded portion 38 adapted to receive a similarly threaded adjusting rod 39 carrying a hand wheel 40, the hub 41 of which normally rests upon a cap 42 at the upper end of the guiding sleeve. As shown more clearly in Fig. 3 of the drawings, the upper end of the guiding sleeve projects beyond the upper plane of the end of the shaft thereby providing a clearance space for the longitudmal adjustment of the shaft when the hand wheel is operated to effect such adjustments.

The operation of the machine is as follows :The material to be acted upon enters through the inlet of the stationary cone where it is caught and crushed between the spirally arranged teeth of the rapidly revolving cone and the teeth of the stationary cone. And in the crushing operation, the tendency of the spiral teeth assisted by the centrifugal force exerted by the revolving cone, causes the material to be carried. upwardly during the crushing operation until it reaches the top of the stationary cone where it flows out into a suitable delivery chute 43 at one side of the said stationary cone.

In grinding or crushing various grades of ores, it is necessary that different degrees of crushing be had for certain grades of ores. To allow for this, the described method of adjusting the drive shaft with its connected rotary grinding cone is provided, by means of which the said rotary cone may be quickly adjusted in a vertical plane relatively to the stationary grinding cone. And it will be understood that by means of the gimbal connection between said rotary grindin member and the drive shaft, any inequa ities in the material being treated, or any wear on without in any way interfering with its proper grinding of the material.

A prominent and distinctive feature of the invention resides in the underfeed arrangement for the material to be crushed, by means of which said material is conveyed to the lower portion of the stationary crushing cone and from that point caused to ascend until thetop of said cone is reached where it is delivered in a finely crushed or powdered condition. By this arrangement it is possible to use the machine with little or no water pressure, other than what is neces sary to cause the material to flowto the point of entry into the stationary cone.

While in the foregoing description I have set forth the preferred form of the invention and also the preferred manner of using the same, I wish it to be understood that I do not limit myself to the precise construction and method of use therein set forth, as changes in the construction and manner of use may be resorted to without-departing from the spirit of the invention.

I claim as my invention A grinding machine comprising a lower stationary cone member having at its apex a bottom inlet and provided-upon its inner inclined face with a plurality of longitudinally arranged grinding teeth, a vertically disposed drive shaft arranged above andcon- V centric to said stationary cone member,

In witness whereof I have affiXed my signature in presence of two witnesses.

GEORGE ALFRED DENNY. Witnesses:

T. J. DENNY, RoBT. GUNTER.

Images