US1265948A - Stamp-mill or the like. - Google Patents

Description

`M. R. OI'SHAUGHNESSY.

STAMP MILL 0R THE LIKE.. APPLICATION FILED AUG. 16, |915.

Patented May14, 1918.

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Zin/mrd Hammam/1255K M. R. OSHAUGHNESSY.

STAMP MILL 0R THE UKE.

APPLICATION FILED AUG-16. |915- Patented May14, 1918.

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ymill mortar formed insubstantiallyv rectan- UNITED STATES PATENT OFFICE.

MARTIN RODERICK OSI-IAUGI-INESSY, OF COBALT, ONTARIO, CANADA.

STAMP-MILL OR THE LIKE.

Specication of Letters Patent.

Patented May 14, 1918.

Application filed August 16, 1915. Serial No. 45,835.

To all whom z't may concern Be it known that I, MARTIN R. OSHAUGH- nessi', a subject of the King of Great Brit.- ain, and resident of Cobalt, in the Province of Ontario, Dominion of Canada, having in- `vented certain new and useful Improvements in Stamp-Mills or the like, do hereby declare that the following is a full, clear,

land exact description of the saine.

The invention relates to improvements in stamp mills or the like, as described in the present specification, and illustrated in the accompanying drawings that form part of the same. v

The invention consists essentially of the improved construction particularly described andset forth in the following specication and accompanying drawings forming part of the saine.v

- The objects of the invention are to devise a stamp mill of simple and durable construction which shall have increased efliciency yand output over these already in general use and co-incidentally lengthen the life of the stamps, shoes and screens, and further main- .tain the several parts, especially the screen in a clean operative condition.

Inthe drawings v .Figure 1 is a perspective view of the mortar having portions thereof broken away.

Fig. 2 is a cross sectional view through the mortar as shown in Fig. 1

Fig. 3 is a perspective detail view of the mortar chuck.

Fig. 4 is a perspective detail view of the bearing bracket of the reservoir partly broken away.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1` is a stamp gular shape,and having the dies 2 arranged at intervals therealong at the bottom thereof, and the stamps 3 arranged with the shoe 12() attached there-above, to drop intermittently on the dies.

The mortar box 1 has the opening 4 along the front thereof and in which is fitted the screen 5, which is customarily set at a slight.

yangle outward at the top. The above parts are in general common to stamp mill equip- Vment and construction and in the operationofthe mill, crushed ore is fed in the required `quantities to the' stamps through a suitable opening at the back of the mortar, in such manner that the ore falls on thecrushing surface of the dies and is reduced thereon by the constant raising and dropping of the operating stamps. To assist the pulverized mass from the mortar through the screen 5, water or mill solution is supplied with the ore1 in sufiicient volume to wash out through screen 5, the ore sufficiently reduced lto pass said screeny openings or orifices, the discharged sliine, sandand solution, etc., drops from screen to a receiving lauiider and is thus conveyed from mortar.

Under ordinary conditions the mill solu-l tion consisting of water, cyanid or the like, supplied for the double purpose of washing Aand assisting in the expulsion of the pulthis clogging or choking the effective discharge area of the screen is gradually reduced at its mosteffective discharge points, namely points on the screen surface where the direct wash of the operating stamps is directed. The closing of the screen at these points on screen surface immediately aects the general internal operating conditions causing excessive sliming of the ore atthe expense of capacity, and also interferes with the proper clearance of the crushing surface ofthe dies due in a great measure to excess slimed pulp retained behind screen, bringing vinto practice a condition of operating mortar whereby vthel important washing influence of the mill solution is practically lost on the surface of the dies, resulting in dry crushing on the surface of the dies, which if continued, even for a short period converts the crushing surface of the dies into irregular or very uneven surfaces, a very undesirable condition where the life of the wearing parts and the capacity of the stamps are valued. In this arrangement of stamp mill there is of course a maximum output, which in practice has been fairly determined and brought. to a standard throughout the various mills in use. It is to greatly increase the tonnage capacity and improve the operating conditions that this invention has to do. I have determined that it is a decided advantage to intermittently change the volume of mill solution supplied to mortar for the double purpose of washing and conveying the reduced ore from the stamps; that is, at one brief period reducing the volume of solution supplied to probably fifty per cent. the required volume so that the ore being reduced under the stamps approaches a thickened or pa'sty likev product during the short solution period, the reduced volume of solution present gives the dropping stamps a more effective chance to reduce the ore, immediately following the short solution period to flood the interior of mortar to any desired height on screen found, best suited for character of ore being reduced by the stamps, The flooding of the interior of the mortar sets up through the action of the stamps active energetic washing influences that readily expels the sulficiently reduced ore from the mortar through the screen, and the mill solution controlling devices as hereinafter described `keep the clearance of the screen assured through lengthy operating` periods, and in so doing materially assist in maintaining the proper and efficient clearance of the crushing surL face'of the dies, an all important condition whereby satisfactory operating conditions are valued.

The mortar, as also the spigot trough 6 is supplied with a mill solution to a height as shown in the drawings, that is, slightly over the dies and bottom of the screen, so that the reduced ore is washed about with the splash of the dies and worked through the screen into 'the spigot trough; the regulardropping of the stamps one after the other along the mortar, setting up a continuous hammering on the dies, so that the agitation of the solution about the'diesis constant to a normal degree, and the flow of the same in the spigot trough normal and' at a practically normal level.

' the/increasedoutput of the 'stamps I4 arrange for the flooding of the screen intermittently by sending a wave through the screen, or by intermittently flushing the said screen on either the inside or the outside in any desired manner, though preferably by the simple arrangement and construction of parts as hereinbefore described.

On the front of the mortar and immediately above the spigot box the flood trough a line adjacent to the front of the box above the said false bottom, and having the flap damper la hingedly secured along the upper edge thereof whereby said damper may be tilted in relation to the bottom 9 to regulate the extent of the opening between said bottom 9 and the false bottom 18.

The mortar 1 along the front thereof and immediately above the false bottom 13 of the flood trough has the inlet openings 15 through which the stamps are supplied with solution as hereinafter described.

Other forms of intermittent vfeeding devices may be utilized for regularly supply ing 'an' extra quantity of solution to the stamps, and the form shownv in the accompanying drawings is only illustrative of a simple device and comprises a reservoir trough 16 extending along the flood trough and having the endtrunnions 17 journaled in the bearings 18 of the bearingvbrackets 11 hereinbefore referred'to. Said reservoir trough has an open top and is substantially circular in cross section around the bottom, but one of the longitudinal walls of the trough is formed straight as shown at-19 whereby when the trough is filled to a certain height with solution the contents thereof will over balance the trough and cause it to tilt and discharge the contents thereof, due to the over balance, as is well known in devices of this kind.

Solution is supplied to the flood trough from the feed pipe 20, said pipe however` preferably being branched into the pipe721 extending over the reservoir trough, the passage of which is controlled by the valve 22. A pipe 23 extends along the flood trough immediately above the inlet 15 of the mor-. v

tar, and is provided with a valve 24;'and a pipe 25 extends along the flood trough immediately'above the damper 14 which coutrols the opening between vthe false' andthe real bottom of 'the trough, the'pipe 25 beingr provided with avalve 26.

y In theoperation of the stamp mill the stamps lare dropped uponthe dies in a regular manner, and the valve z22 supplied solution through the pipe 21 to the reservoir trou h 16, said trough having a suitable num er of orifices 27 in the bottom thereof whereby the solution will immediately flow yinto the false `bottom 13 and through the inlet orice 15 into the mortar about the quantity to moistenzthe ore'being reduced to ditions 'is remarkably' thorough, though it bring the saineto a pasty condition, but not being sucient to wash' away the -iner particles. v 1' The reducing ofthe ore under such conwould be entirely impracticable to allow such conditions to continue uninterrupted.

' Thereduced ore must have sufficientsolution to carryit` away and thisv is automatically supplied, as the reservoir trough lille, due tothe solution flowing thereunto fasterthan itis ldischarged through the outlets 27, so that when, the trough tilts, a wave "of solutionrlows down the false bottom 13 of the flood trough, throughy the `inlet'openings lintothemortar and washes away the thoroughly reduced ore.'

`Coin'cidentally', the flooder wave ofsolution from 'the reservoir trough partly :passes down'the `bottom 94 or the `flood `f trough, through the .opening y regulated by the damper 14 of the falsebottom, and this solution'passing' down the bottom 9, dashes B5 against Aand through the screen of the mortarfroni the voutside thereof, washing the "same and assisting in the agitation of the l,water within the mortar.

A. On the continued operation .of the stamps,

an outward wave or' solution: occurs and- "passes throughA the screen and thoroughly Aflushes the mortar and vcarries loff all the ore whichhas been thoroughly reduced into the 'f spigot trough from which it readily passes through the overflow dischange pipe 27.

ToV aidthe flushing of themortar I place' a chuck'or'ledge strip 29 along the mortar immediately in front of the shoes v'2, and

thisfchu'ck, isv beveled upwardly from the front of the vshoes to the' screen opening 5. This chuck`29 is bolteditothe front of thef mortar by suitable bolts30 extending outwardly from the chuck vthrough the' slots 31 in the front of thenmortarywhereby the height of the chuck maybe adjusted. v Thischuck directs Athe liquider solution within the mortar against the screen, and

thereby assists in the quick and uninter? rupted discharge of the solution from the said mortar.

The general arrangement of the several parts of the invention as hereinbefore described renders the complete mill most eicient, and particularly the intermediate 1 passage through "the battery screen. st'amps,`said 'solution iowing in a sufficient f `fi`oo`ding E 'of the mortary box 1 eeotively v washes theV thoroughly disintegrated solids from the mass being reducedin' the stamps, and further effectively expelsy such disintegrated particles,- and the solids after they have, throughv the action of: the stamps 'above"construction, and many' apparently widely different embodiments of my invention within the vscope of the claims, constructed without departing from the spirit or scope thereof, it is intended that all'mat- 'ter containedin the above specification land accompanying `drawings be interpreted as' illustrative, and'not in a limiting sense.

What I claim as Amy invention is :e 1. In combination, a receptacle :with a side'screen, a vstationary flood trough ladcjacent tos'aidreceptacle and leading to said screen, andv a tilting trough 4adapted to discharge in said lflood trough, said nood 1 trough havinga pivoted false bottom adapted to discharge material therefrom into said receptaclev above said screen.

` 2. `In 'combinationfa receptacle with a side screen, astationaryv flood trough adjacent to said receptacle and leadingto'said screen',- and a tilting trough curvilinear Yin cross section ai-jthe'bottom andone 'of the ylongitudinal walls, 'the other longitudinal walls "being: formed straight whereby when the tilting trough is il1ed,"itwill overbalf iance'and vdischarge inf'said Vflood trough, ysaid flood trough having a; pivotedf false bottom" 1adapted to discharge material therefrom into said receptacle aboveV saidscreen. 3. In combination, afreceptacle `"with a 4`side screen, vstationary flood trough' fad- Jacent to said receptacle and leadingtofsaid screen, and va' tilting trough* in the said flood trough vadapted to be' automatically tilted under/gravity and intermittently fill 'the flood` trough, and-means located `adj acent'tofthef bottom off-the hood trough-whereby the material from'the trough is dis- "charge'd into the' receptacle above saidscreen and through said"'sfcre'en;v 'f f' i 4.1.x 'samp minv Comprising' a' morta-tm,

" stamps operatively arranged in vsaid mortar box, a discharge screen arranged in a suit- ,able opening in said mortar box, va' flood trough arranged along the exterior of said mortar box, a dividing plate arranged in said iood trough, means of communication from one side of said dividing plate to the interior of said mortar box and means of communication from the other side of said dividing plate to the exterior of said screen,

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