US1363990A - Ore-grinding machine - Google Patents

Description

G. w. MORTHLAND.

oRE'GmNmNG MAcHmE.

APPLICATION FILED DEC. 20. |918. f Patented Dec. 28, 1920.

2 SHEETS-SHED l.

@Hof/neg UNITED `STATE/sf PATENT. oFF-ice.)

' GEORGE w. non'rHLAi'qD, or LEAD, SOUTH nuora.

03E-calname mcnnm 1,363,990. Speciqat'in 0f Letters Patent- Patented Dec. 28, 1920.

Application led December 20, 1918. Serial No. 267,686

To aZZfwwm it may concern: '.trated inthe accompanying drawings, in

Be it known that I, GEORGE W. Mo'iirrrwhich: j LAND, a citizen of the United States, residing Figure l'is a longitudinal sectional view at Lead, in the county of Lawrence and through my' device complete, l State of Sout Dakota, have invented new Fig. 2 is a cross sectional view v through 60 and useful Improvements in Ore-Grinding `the saine showing one form of disks,` Machines, of which the following is aspeci- Fig. 3 is an elevation illustrating. amodi- 'cation. f fied form of disks, l This invention relates to crushing and Fig. 4 is a cross sectional view on theline `1o grinding machines, particularly to that type 4 4 of Fig. 3, 65 employed for crushing and grinding ores, Fig. 5 -is an elevation illustratinga still and has for its object the provision of a further modified form of disks, and grinding. machine of the tube mill type F ig.' 6-is a cross 'sectional view therewhich includes a rotating tapered'casing through on the line 6-6 of'Fi 5. Y within which is disposed co-acting disks of Referring more particularly to the .draw- 70 vdifferent diameters and provided upon their ings the numeral l0 designates the head at confronting faces with recesses engaging the inlet end of the device, this head-having.

and crushing the material vfed axially I extendingI from its center a trunnion 11 pro.

through the device, all Aof the disks rotating vvided with a central opening 12 forming an at different .speeds whereby they willI move inletopening. olted upon the other side 7`5 relatively to one another whereby to obtain of the head 10 is a ange member '134 to the maximum grinding effect upon the ma which is secured the lar e`r` end of a tapered terial, the disks furthermore rollingupon casing 14 .which is closed atits other. end by the material disposed between their periphya head 15 having extending from the center eries and the inner periphery ofthe tapered thereof a trunnion 16 provided Ywith an 8 0 casing. opening 17 constituting the discharge opena tube'mill of this character in which the ed upon thel head f1.5 and'upon the tadisks pro ress ivel decrease in thickness pered casing 14 for holding these partssef 3o whereby t e num r of griny surfaces curelyv assembled. The trunnions 11 land 16'85" will be increased toward the disciarge end are mounted in suitable bearin 19' so that of the device whereby coarse material fed the entire device may be rotatev. into' the device may in one operation be re- .Disposed against the inner periphery of duced-'to extreme neness. the tapered shell or casing 14 is a lining 20',

vAnother object isthe provision of a device preferably of wood, which is. in turn en '90;

An important object is the provision of of the device. Av flange member'18 is f ofthis -character-which may bev used with gaged by a metallic lining'21 fo l the either a current of air ora current of water i inner shell. Bolted" upon' the heads 1 and as the means for progressing the material 15 are hardened Steel lplates'22* andjf: 'l

through the. device from the inlet to the .23 respectivelywhich have' their periph- 40 outlet end thereof. Y

Still another object is the provision of a inner meta ic shel1 21. 'I he purpose of thel` 'device of this character in which the rowooden lining isto serve asa shockl tating disks are formed of sections, the outer absorber for tali1n' `up;a great `deal 'of v the section being removable and replaceable in shock incident to t use ofthe device. caseof wear.r s

Another object isthe revision of'a de- 14 and bolted tothe ange'member 13 v vice of this character w ch' will be comand head 10 is a ring. ear 244 which may be A eries'engaglmgl the lnner periphery of the '95 securea'uponthe larger end of 'checas-ion parativel Vsim leand-inexpensivein manu* enga ed b 'anysuita le drivenpinionforf. '4 -v facture, highly? eilcientv in use, durable Ain rotating tli'e casing. It 'notedthat so service, ecient in operati im rovem'ent inthe art."- to, .is -formed of. longitudinally extending ith theabove 'and otherrobjects and adsections which' are 'prevented from -dislrza-A vantagesjin view, the invention consists in tionf by the means ofthe lining plates 22 the .details of construction to be hereinafterand 23 at the end of. the outer casing..

e more and claimed, and Disposed' withi n the interior of the linne;- 119 on and. a. general the inner metallic casing 21, above referred '1015;4

casing 21 is a lurality of disks 25, the alternate ones o which are of different diameters as clearly shown in Fig. 1. In the form of' disks shown in Figs. 1 and 2 each disk is shown as comprisili a rin -like member having its outer perlphery p aned for rolling action in relation to the inner shell 21. Furthermore, each disk 25 has its faces provided rwith radiall extending grooves-26 which are V-shape in cross section, as shown. It will be noted that the disks 25 at the larger end ofthe casing are of appreciably greater thickness than the disks at the smaller end of the casing and that the disks progressively decrease in thickness toward the discharge end of the device.

The operation of the device is as follows:

The casing is rotated in any desired man-y ner and the material to be crushedl and ground is introduced throu h the opening 12 in the trunnion 11 and w1ll pass into the openings in the centers of the grinding disks. vIn view of the fact that the disks are of different diameters. these disks will be rotated at diierent speeds and will consequently rotate inl respect to one another. The material falling into the openiligs within the disks willpass into `the -shaped grooves 26 and will be crushedI therein by *y the relative rotation ofthe successive disks. A portion of the material will pass through the radial grooves 26 to the outer periphery of the disks and will always be dlsposed at the lower portion of the casing, the disks rolling u on this material and crushing it continual y. If any of the material adheres to the inner lining 21,v as the casing is rotated and this adhering material approaches the top of the casing it will fall by gravity back onto the disks and be crushed further. In view ofthe fact that the casing is taperedhthere will be a tendency to cause the disks to gravitate toward the larger end of/ the casing, thereby keeping the crushing disks in close contact `with one another. The friction generated between the relatively rotating disks will prevent excessive shock against the sides of the casing. Owing to the taper of the casing all of the disks, re-

. gardless of diameter, will travel a variable number `of rim feet per minute, the smaller disks of course turning a greater number of revolutions than the larger ones, thereby causing a continuous eccentric grinding motion between the planes of the -disks as they roll forward in the line of travel. It will be noted that in view of the fact that the disks toward the discharge end of the 'device are of less thickness thanthe disks toward the inlet ,end of the device that a greater number of grinding planes will be provided toward the discharge end and .that thev material will be consequentlyvground conducting the materiall into, through and with registering radially extending grooves disks while permitting passage of material ent1rely` through the disks. In sliming the forms of disks shown in Figs. 1v and2.

more 'and more as the material is reduced to 65 smaller pieces.

It 'is understood, of course, that. in the use of the 4device either a current of air or" a stream of water must be employed for out of the device. After the device is in operation for some time and the material is reduced to the proper fine-ness, the out'- flowing stream either of air orv water will pass from the opening 17 inthe trunnion 16, carrying with it the finer particles of material.- ny particles of material too heavy to be carried out by the stream of air or water will be' caught within the recess 27 at the .dischar e end of the device and returned throug the centers of the disks for further grinding. l 4

'In Figs. 3' and 4 I have shown a modified form of grinding disk. In this form, the disk is shown as comprising an outer section 28 provided upon its inner periphery with a continuous tongue 29 engaging within corresponding grooves formed. 1n the outer periphery of an inner ring formed of arcuate sections, 31, held together at their lmeeting ends by preferably hard wood Wedges 32 seating within corresponding re'- cesses 33 in the ends of the sections. In this form of disk when the outer section becomes 'Worn after long use, it may be removed and replaced byv a new section, the sections of the inner rin being interchangeable and being suitable .or continuous use. In this form of disk the'inner, ring sections are provided 34 of the same configuration and arran ement as the grooves in the previously escribed form of disk., The operation of the device, when equipped with this form of disk is identically the same as the operation when the previously described form is employed.-

Referring to Figs. 5 and 6 it will be seen that I -have provided a still further modiled form of disk. In this form, each disk 35 is provided with a relatively small central opening 36 and is further provided with a plurality of concentrically arranged series of perforations 37 and 38, the` outer series 38 having communicating therewith radially extending grooves 39 which extend to the -outer -periphery of the. disks and` which are V-shaped in cross section. This form' of disk is particularly adapted for use in sliming; that is, when it is desired to grind the material to an extremely fine degree.

` It will be noted that in this form of disk Athe series of perforations- 38 and 37 are countersunk so as to be the equivalent of the V-shaped grooves in the other forms of and 3 and 4 are removed from the casing and an entire set of the disks shown in Fi 5 and 6 substituted in place thereof. T e operation is the same regardless of which form of disk is used.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided an ore crushing and grinding machine in which all the disk members not only exert a crushing .and pounding action at their peripheries on the material introduced into the device, but also rotate relatively to one another, owing to the taper of the casing, whereby the material will be constantly subjected to a grinding action between all the successive disks.

While I have shown and described the preferred embodiment of the invention, it will of course be readily understood that I reserve the right .to make such changes in the form, construction and arrangement of parts as will not depart from the spirit of the in-v vention or the scope of the appended claims.

Having thus described my invention, what I claim is:

1. A device of the character* described comprising a rotary casing, and a plurality of disks' of progressively decreasing thickness toward the discharge end and of diferent diameters disposed within said casing, said disks being adapted to rotate relativel/ to one another when said casing is rotated, each ofI said disks being'provided with a central opening forming a continuous pasA sageway through said disks and having their confronting faces provided with radially extending grooves extending from the central openin to the outer periphery.

2. In a evice of the character described comprising a rotary casing, a plurality of grinding disks each formed of a continuous outer section and an inner section formed of segments and having tongue and groove connection with the outer section, and wedge members engaged between the ends of the segments whereby to hol'd the inner section expanded, said sections being provided with registering radial grooves. n testimony whereof I aix m signature. GEORGE W. MORTIILAND.

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