US1020092A - Grinding-mill. - Google Patents

Description

B. G. GRIFFIN, DEGD.

L. M. GRIFFIN, BXEUUTRIX.

V GRINDING MILL.

APPLICATION FILED JULY 25,1911.

Patented Mar. 12, 1912.

r nnnn lr l l I l l l l A l u l l nl STATES PATENT OFFTCE.

EDWIN C. GRIFFIN, OF NEWTON, MASSACHUSETTS; LOVINA M. GRIFFIN, EXECUTRIX OF SAID EDWIN C. GRIFFIN, DEGEASED, ASSIGNOR TO BRADLEY PULVERIZER COM- PANY, OF BOSTON, MASSACHUSETTS7 A CORPORATION 0F MAINE.

GRINDING-MILL.

To all whom 'it 'may concern.'

Be it known that I, EDWIN C. GRIFFIN, a subject of the King of Great Britain, residing at Newton, in the county of Middlesex and State of Massachusetts, have invented 4certain new and useful Improvements in Grinding-Mills, of which the following is a specification, reference being had to the accompanying drawings, forming part thereof.

This invention has reference to improvements in mills for pulverizing or grinding slag, ore, rock, or similar material preferably ground in a dry condition, and the invention relates more particularly to that class of such grinding mills in which the grinding is effected by a roll having a gyratory action with relation to its suspension mechanism which roll coperates with an annular die.

One object of the invention is to so mount the sustaining bearing for the suspension mechanism of the grinding roll shaft that said bearing is located above the driving pulley and above the dust rising from the mill while said bearing is located at a point at which it .may be conveniently accessible.

Another object of this invention is to so construct a grinding mill having a rotary driving and suspension mechanism for the shaft of 'the grinding device and a gyratory shaft carried by said mechanism that said suspension mechanism may operate a fan which will not interfere with gyratory movement of the grinding roll shaft. The current of air created by said fan being confined and directed toward the axis about which the grinding device swings.

Other objects of the invention will appear from the following description.

The invention consists in the peculiar construction of the sustaining bearing for the rotary suspension mechanism of the grinding device.

The invention also consists in the combination with the rotary suspension mechanism of the gyratory grinding roll shaft carried by such mechanism, the rotary fan embracing the path of said shaft without restricting the operation thereof, and the air chamber or drum embracing said fan and, preferably, having an outlet of less diameter than that of the annular grinding die and of the screen.

The invention also consists in such other Specification of Letters Patent.

Application filed July 25, 1911.

Patented Mar. 12, 1912.

serial No. 640,413.

novel features of construction and combination of parts as shall hereinafter be more fully described and pointed out in the claims.

Figure 1, represents a side elevation, partly in vertical section, of the improved grinding mill. Fig. 2, represents a sectional view of the same taken on line 2*2 Fig. 1. Fig. 3, represents a view of the fan partially in elevation and partially in section as on line 3 3 Fig. 2.

Similar numbers of reference designate corresponding parts throughout.

As shown in the drawings, in its preferred form, 5 indicates the base or body of the mill having the pan 6 furnished with the annular die 7 above which is located the annular screen 8 and the annular casing drum 9 which embraces the screen S at a distance therefrom to provide a chamber a, in which the pulverized material is received after such material passes through said screen. The upper end of chamber a is closed by the cap ring or plate 10, which extends inward to a point within the screen 8 and has a central opening which is embraced by the depending lip 11 of said plate 10, which lip is adapted to receive the collar l2. Plate 10 is sustained from portions of the main frame by bolts as 1S and said plate supports the fan chamber 14;.

The frame of the machine comprises the members 15, 15 and 16, 16 preferably as shown. On the members 15, 15 is mounted the annular member 17 provided with the ring 18 and securing means for said ring, the inner surface of said member 17 and ring being curved to form a seat in which bearing 19 can be adjustably secured. Frame lncmbers 16, 16 at their upper ends support the cross piece 20 having the seat 21 curved and contracted at its lower portion, in which seat is adjustably secured the globular exterior of the bearing box 22.

Bearing box 22 has a vertical bore and the upper chamber 23, which is closed by the cap 241. Vithin this chamber 23 is located the bearing ring 25 for antifriction bearing members as 26 which support the nut 27 secured to the shaft 27 which latter extends through and is journaled in the bore of the bearing box 22 and at its lower enlarged end is secured in the hub 28 of drive pulley 29 from which hub depends the hollow shaft member 30 having the spreading mouth' 31, extending into the fan chamber 14, and the shoulder32 provided with the bearing ring 33. On the mouth 31 of said hollow shaft member 30 is clamped the two part frame 34 having a series of fan blades 35, 35.

Ring 33 forms the direct suspension member on which the convex lower face 36 of the head 37 may swing, while rotation of said head 37 is eifected by the engagement of its cross head 38 between the cheeks 39, 39 of the rotary hollow shaft member 30. Secured in the head 37 is the shaft 40 having at its lower end the roll 41 which under theV centrifugal act-ion of the lower end of shaft 40 under the rotary motion of the casing 30 may ride against the inner surface of the die 7.

Provision is made to feed material to be ground through the feeding mechanism indicated as a whole by numeral 42 and to deliver such material at a point within the screen 8 and below the opening of the fan chamber 14.

It is to be noticed that the pulley 29 is located approximately midway between the bearings 19 and 22, whereby power is delivered at a most eective point and the grinding shaft suspension mechanism, including shaft 27 to the depending mouth 31 of the hollow shaft member 30, is sustained by the antifriction bearing contained in chamber 23. When said pulley 29 is rapidly rotated the fan blades 15 operate to create a downward current of air within the air chamber 1'4, and this current of air flows down through the contracted opening 11 having the collar 12 to a point within the centrifugal grinding path of the grinding roll 41 and then outward through the screen S carrying with it some portions of the ground material which are sufliciently small to pass through the meshes of the screen. The air currents alsoprevent the rising of the dust through said air chamber.

Having thus describedA my invention, I claim as new and desire to secure by Letters Patent.

1. A grinding mill of the nature described ccmprising a frame having at its upper end a concave seat, a bearing member having a globular periphery adjustable in said seat, a ring supported by said bearing member, a shaft journaled in said bearing member and having a nut at its upper end, antifriction devices on said ring for supporting said nut, a'hollow shaft member mounted on the lower end of said shaft and having a pulley, a bearing in which the lower portion of said hollow shaft member is journaled, and a grinding roll shaft pivotally mounted within said hollow shaft member, as described.

2. A grinding mill of the nature described comprising a pan having an annular die, a screen embracing said die, a casing drum inclosing said screen, a fan casing located above the screen and having an outlet extending within the screen, a hollow shaft rotatably mounted and extending into said fan chamber, a fan on the lower end of said hollow shaft, and a roll shaft mounted in said hollow shaft for gyrat-ory movement and having at its free end a Vgrinding roll adapted to coperate with said annular die.

3. A grinding mill of the nature described comprising a pan having an annular die, a screen embracing said die, a casing drum inclosing said screen, a cap plate eX- tending inward from said casing drum and having a contracted opening of less diameter than said screen and furnished with a depending collar, a fan chamber located on said cap plate, a fan rotatably mounted in said fan chamber, means for operating said fan, and a gyratory grinding device coperating with said annular die, substantially as described.

4. A grinding mill of the nature described comprising a pan having an annular die, a screen embracing said die, a casing drum inclosing said screen, a cap plate for said casing drum and screen having a contracted opening, a fan chamber mounted on said plate, a frame having at its upper end a seat, a bearing member mounted in Said seat and furnished with an antifriction bearing, a shaft journaled insaid member and having means for engaging said antifriction bearing, a hollow shaft member mounted at the lower end of said shaft and having a pulley and a mouth depending below said pulley,'a bearing in which said hollow shaft member is journaled, a fan on the mouth of said shaft member and located in said fan casing, and a shaft having its upper end mounted in said hollow shaft member for universal movement and furnished at its EDWIN C. GRIFFIN.

Witnesses:

FRED M. MONTGOMERY, HENRY J. MILLER.

Copies of this patent may be obtained for ve cents each, by addressing' the Commissioner of Patents, Washington, D. C.

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