US1525789A - Grinding mill - Google Patents

Description

eh. i925. LZSQ 4 l L s. BARTLEY @BINDING MILL @riginal Filed Feb. e, 191e I INI/ENTOR. Wi 6. BARTLEY TTORNEV. i

Patented Feb. 10, 1925.

U NI TED T ATE S :P TL'EN T iiFF FTCE 'aosnrii s. BARTLEY, or DENVER, icerro-miliari GRIN-DING MILL.

Application filed February 8, 1919, SerialNo. 275,787. Renewed May 14,1924.

To all whom t may concern:

Be it 'known that I,y JOSE-11H S. BARTLEY, a citizen of the United States, residinon at Denver, lin the county of Deliver' and Dt-ate of Colorado, have invented certain new and useful Improvements in Grinding Mills, of which the followingis a specification.

This invention relates to improvements in -ball grinding-mills and its Objectis topro-Y Figure 3, a similar section taken on the `g line 3-3, Figure l.

Referring to the drawings by numerical characters of reference which in the several views designate corresponding parts, 2 indicates a lcylinder whichby means of axially alined trunnions 3 and 4 at its opposite ends, is rotatably mounted in pillow blocks on standards 5 and'. y

The c linder is composed of an outer shell 7 c osed at itsends by heads 8 fand 9 of which the trunnions are a part, and a therewith coaxial inner shell 10.

The shells are connected in spaced relation to each other vby distance bolts 12, the inner shell is for convenience in construction and installation, longitudinally divided into a number of adjoining sections and the outer shell is provided with a lining 13 whichA fo-r the same reasons is likewise made in sections.

Both the inner shell and the ylining are made of a hard, Wear-resisting material while the outer shell is as usual made of ordinary iron. i

The trunnions of the cylinder are hollow for the passage of material to and from its interior, that at the feed end of the mill carrying a scoop 14 which dips into a supply-trough 15 and intermittenthv discharges its load into the trunnion.

'between the;A inner shell and vlthe -adjacent head ais made of sufficientiyitifteipievide a classifying chamber 17 in wliichthecfo'arser material in the ground product'is-separated from the fines which'p'ass through V'the holvlovv'trun'nion 4 as will hereinafter 'be more fully explained.

The inner shell whose interior constitutes *the grinding chamber 1.8 oftheiiiill, is 'open atthe feed end ofthe Y'same and 'its opposite end isclosed by a head 19 which has a central outwardly projecting s'pu't 20 `fo`r vthe discharge of the ground prod-uct into the classifying chamber.

The spout has, interiorly, a'spiraligroove 20a Winding revers'ely to the direction of rotation of the cylinder' for ythe ret-urn of balls which entered A'the saine with the round material, and a screen`21a-t'th`e outer end of the spout aidsin'preventing thevpas- Sage into the classifying cliaiiiberv'of balls of larger size than its 'meshes The niesh ofthe screen is smaller than tliefwidth of the space 16 between the shellsjf'the cylinder, so 'that balls which by wear lhave been reduced 'to' a size Which `permits of tlieirp'a'sfs'iiig "through the screen may freely move Athrough said space to reenter the'giinding chamber at the feed end ofthe mill.

The annular space between the tivo shells is divided into helical channels 'winding reversely to a fixed direction of rotation of the mill, by spiral ribs '-22 which 'fare continued within tlie'classifyin'g chamber.

The ribs are made up ofl series of sections divided by spaces which interconnect the different channels, andthe sections of each rib are placed in staggered relation vtto V'those of the next preceding Aand following ones so that there is no-continuous 'longitudinal pas sage through the space between the shells and the material passingithroughthe channels inust dro-p -froin one 'to vthe other in What may be called a continuous cascade While constantly wending its way to the feed end of the mill. j l y An lopening in the outer shell normally closed by a plug 28, is provided for the dis charge of material remaining in the channels after the rotating cylinder is brought to a condition of rest.

A circular dividing plate or baffle 24 placed concentrically in the classifying chamber intermediate of the heads of the inner and outer shells, extends circumferentially in 'close proximity to the inner edges of the spiral ribs and is preferably mounted upon adjusting screws 25 extending through the outer head, so that its distance from the heads may be regulated according to varying conditions.

A central opening in the baflie connects With a pipe 26 extending through the holloW trunnion l and this pipe is by means of a swivel-union 27 connected with a conduit 28 leading from'a conveniently located source of water supply.

In the operation of the mill, the cylinder 2 is rotated by the driving action of a pinion meshing with a gear wheel 29 fastened around the outer shell.

The pulp fed into the rotating cylinder through the hollow trunnion 3 by means of the therewith connected scoop let, passes into the inner shell where it is subjected to the triturating action of a mass of balls or pebbles which are constantly lifted to drop back into the pulpous mass.

The ground product passing through the spout on the head of the inner shell, enters the classifying chamber and is by contact with the baffle compelled to move to the outer circumference of the same before it enters the portion of the chamber between the baffle and the head of the outer shell.

The shines iioating to the surface of the liquid pass through the trunnion 4l into a chute or other receptacle and the coarser material which settles in the lower porton of the chamber, moves through the spiral channels winding reversely to the direction of rotation of the cylinder, to the feed end of the mill where it reenters the inner shell for further grinding.

The material while passing through the channels, drops from one into the other through the staggered openings in their dividing walls and thereby prevents clogging which might occur if the channels were of unbroken continuity. f

The classification taking place in the chamber 17 is aided by a supply of water through the pipe 26, which liberates the shines and assists their ascending movement to the surface of the liquid constantly discharged through the trunnion el. and which furthermore facilitates the return movement of the oversize to the feed end of the mill.

The baffle by breaking the current from the grinding chamber to the outlet of the mill, is also instrumental in producing a clean separation of the lines from the coarser matter' and by varying its position with relation to the heads between which it is placed, the classifying action may be regulated in accordance with the requirements of different materials.

Any balls of ordinary size passng with the ground material into the spout, are prevented from entering' the classifying chamber by the screen 2l and are returned into the grinding chamber by the screw-thread, and balls which by wear have been reduced to a size which permits of their passing through the meshes of the screen, move with the oversize through the. channels and are thus returned to the grindng chamber.

Although the ribs 22 have been shown in the drawings as formed integral with the lining of the outer shell they may be made separate therefrom and secured by bolts or rivets or they may be fastened to or made integral with the inner shell as may be found to be most convenient.

Two or more battles may be arranged in the classifying chamber in case itl is found that a repeated defiection of the current of material is advantageous in obtaining a clean division of the shines from the coarse material in the product of the mill, and other modifications in the construction and arrangement of the parts of the mill may be resorted to wthin the spirit of the invention as defined in the hereunto appended claims.

lhen the operation of the milll is discontinued for any length of time, the material remaining in the interconnected cha-nnels may be withdrawn by turning the cylinder until the opening of the outer shell is atthe bottom thereof and removing the plug which normally closes the opening.

It is essential that the opening of the trunnion a at the discharge end of the mill is of larger diameter than that of the spout 20 in the head of the inner' shell to produce a constant outward current.

Having thus described my inventon what I claim and desire to secure by Letters Patent is:

l. A grinding mill comprising a rotary cylinder having a classifying chamber at one end, a grinding chamber between the classifying chamber and its opposite end, an opening for the discharge of material from the classifying-chamber, an ope-ning for the discharge. of material from the. grinding-chamber into the classifying-chamber, and a plurality of channels interconnected by staggered openings in their dividing walls, and winding reversely to a lined direction of rotation of the cylinder, from the classifyingchamber, around the grinding chamber to and in connection with the opposite end of the same.

2. A grinding mill comprising a rotary cylinder having a'classifying chamber at one end, `a grinding-'chamber 'between the fclassifying chamber andits opposite end, an opening for the discharge of material fromY the classifying chamber, an opening for the discharge lof material from the grinding chamber into the classifying-chamber, a baiiie spaced from the outer wall of the mill and within the same outside of the grinding chamber and a spiral channel winding reversely to a iixed direction of rotation of the cylinder, from the classifying-chamber, around the grinding vchamber to and in connection with thefoppositefend o-f the same.

3. A grinding mill comprising a rotary cylinder having a. classifying chamber at one end, a grinding chamber between the classifying chamber and its opposite end, an opening for the discharge fof material from the classifying-chamber, an opening for the discharge of material from the grinding chamber into the classifying-chamber, a baiiie spaced from the outer wall of the mill and adjustably mounted within fthe same inside of the grinding-chamber, so that its distance from the discharge-opening in the grinding chamber may be varied, means for adjusting the position of the baffle, and a spiral channel winding reversely to a fixed direction of rotation of the cylinder, from the classifying-chamber, around the grinding chamber to and in connection with the opposite end vof the same.

et. A grinding mill comprising` a rotary cylinder having a classifying chamber at one end, a grinding chamber between the classifying chamber and its opposite end, an opening for the discharge of material from the classifying chamber, an opening for the discharge of material from the grinding chamber into the classifying-chamber, means for introducing a liquid into the classifying-chamber, and a spiral channel winding reversely to a iiXed direction of rotation of the cylinder, from the classifying-chamber, around the grinding chamber to and in connection with the opposite end of the same.

5. A grinding-mill comprising a rotary cylinder having a feed-opening at one end and a classifying chamber at its opposite end, an inner cylinder spaced circumferentially from the other outside o-f the classifying-chamber and the inner cylinder having an opening for the discharge of material into said chamber, and a channel winding through the space between said cylinders reversely with relation to a fixed direction of rotation of the same, from the classifying chamber at the one end of the outer cylinder, to and in connection with the portion of the inner cylinder at the opposite end of the same.

6. A grinding-inill comprising a. rotary cylinder having a feed-opening at one end and a classifying chamber at its opposite end, an inner cylinder spaced circumferentially from the other voutside of fthec'lassifying-'chamber and having an opening lfor the discharge of material into said chamber, and a plurality of intercommunicating channels winding through the space betweensaid cylinders reversely with relation to a fixed direction of rotation of the same, from the classifying chamber at the one end of the outer cylinder, to and in connection niithltlie portion ofthe inner cylinder, at the opposite end of the same.

7. A grinding-mill comprising a rotary cylinder having a feed-opening at one end and a classifying chamber at its opposite end, an inner cylinder spaced circumferentially from the other outsideof the classifying chamber and having an opening for the discharge of material into said chamber, and a plurality o' channels interconnected by staggered openings in their dividing walls, and winding through the space.y between said cylinders reversely with relation t0 a fixed direction of rotation of the same, from the classifying chamber at the one end of the outer cylinder, to and in connection with the portion of the inner cylinder, at the opposite end of the same.

8. A grinding-mill comprising a rotary cylinder having a feed-opening at one end and a classifying chamber' at its opposite end, an inner cylinder spaced circumferentially from the other outside of the classifying chamber and having an opening for the discharge of material into said chamber, and

a channel winding through the space between A said cylinders reversely with relation to a fixed direction of rotation of the same, in connection with the inner cylinder at the feed-end of the mill, and continued within the classifying chamber at the opposite end of the same.

9. A grinding-mill comprising a rotary cylinder having a feed-opening at one end and a classifying chamber at its opposite end, an inner cylinder spaced circumferentially from the other outside of the classifyingchamber and having an opening for the discharge of material into said chamber, a channel winding through the space between said cylinders reversely with relation to a fixed direction of rotation of the same, in connection with the inner cylinder at the feed-end of the mill, and continued Within the classifying chamber at the opposite end of the same, and a baiiie in the classifyingchamber between the ends of the cylinders, and circumferentially, adjacent to the channels.

10. A grinding-mill comprising a rotary cylinder having a feed-opening at one end and a classifying chamber at its opposite end, an inner cylinder spaced circumferentially from the other outside of the classifying-chamber and having an opening for the discharge of material into said chamber, a

lll)

channel Winding through the space between said cylinders reversely with relation to a fixed direction of rotation of the same, in connection with the inner cylinder at the feed-end of the mill, and continued Within the classifying chamber at the opposite end of the same, and a baffle in the classifyingchamber circumferentially, adjacent to the channels and mounted for adjustment to vary its distance from the discharge-opening of the inner cylinder.

11. A grinding mill having a feed-opening and a discharge-opening respectively at its opposite ends, and interiorly a classify` ing chamber its disi'hargeend, and a grinding chamber between the classifying chamber and the feed-end of the cylinder having a central opening' for the discharge of material into the classifying chamber, there being a passage around the grinding chamber connecting its end at the feed-end of the cylinder, with the classifying chamber, and a bafle spaced from the discharge opening of the grinding chamber and, peripherally, from the Wall of the outer cylinder, inside of the classifying chamber.

l2. A grinding-mill comprising a rotary cylinder having a feed-opening at one end and a classifying space at its Opposite end, an inner cylinder spaced circumferentially from the other outside of the classifying space and having a central opening for the discharge of material into said classifying space, the space bet-Ween said cylinders communicating at one end With the classifying space, and at its opposite end with the interior of the inner cylinder, and a baffle spaced from the discharge-opening` of the inner cylinder, and, peripherally from the Wall of the outer cylinder, inside of the classifying space.

In testimony whereof I have afixed my signature.

JOSEPH S, BARTLEY.

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