US2360086A - Reduction mill - Google Patents

Description

Oct 10, 1944.

w. B. THURMAN ETAL 2,360,086

REDUCTION MILL Filed Jan. 19, 1943 2 Sheets-Sheet 1 Q mV 93 Q Q Q i} 9} INVENTORS 50.5. T]: urman BY E. H,GZynn ATTORN EYS 6 1944- w. B. THURMAN ETAL 2,360,086

REDUCTION MILL Filed Jan. l9, 1943 2 Sheets-Sheet 2 INVENTORS 50.5, Th arms):- BY E. H. Glyn r2 ATTORNEYS Patented Oct. 10, 1944 UNITED STATES PATENTOFFICE 2,360,086 REDUCTION MILL William B. Thurman and Edwin A. Glynn; Lodi, Calif., assignors to Super Mold Corporation of California, Lodi, Calif.

Application January 19, 1943, Serial No. 472,866

2 Claims.

This invention relates in general to an improved reduction mill, and in particular is directed to an impact mill for reducing ore ma desired screen size for subsequent processing and the recovery of precious metals therefrom.

One of the objects of the present invention is to provide an ore reduction mill which includesan assembly of axially alined rotary impact units mounted on a driven vertical shaft, and a cylindrical housing surrounding said shaft and assembly in concentric, adjacent but clearance relation to the latter; said housing being faced on the interior with ore disintegrating plates, and additionally said housing is formed with a relatively large side opening door whereby parts of the mill within said housing may be removed, repaired, or replaced with relative ease and without necessity of disassembling the mill.

a reduction mill which includes rotary impact units of unique construction; each of s'aid'units comprising a hub, legs radiating from said hub, and removable impact shoes mounted on the outer ends of said legs.

A further object is to provide rotary impact units as in the preceding paragraph in which the impact shoes are elongated and extend generally transversely of the direction of travel or rotary movement; said shoes being doubleended and reversibly mounted so that when the initially outer ends of said shoes become worn, the shoes may be reversed and the other end thereof disposed outermost for subsequent operation of the mill. I

An additional object is to provide a reduction mill which includes a novel adjustable mount-.

' as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation, partly in section, of the'improved reduction mill.

Another object of the invention is to provide said mounting being arranged to posie Figure 2 is a plan view of the mill with the top of the housing partially broken away.

Referring now more particularly to the characters of reference on the drawings, the numeral l indicates a cylindrical housing disposed with its axis vertical, said housing including a circular top 2. The housing I may be rigidly supported in any suitable manner.

The housing I is formed at the side with a door opening 3 which is substantially halfcircle in circumferential extent and at the top and bottom edges terminates adjacent but short of corresponding ends of the housing. The portion of the housing within and normally closing said opening is a separate, circumferentially arcuate door 4 which is hinged to a fixed portion of the housing, as at 5, for horizontal swinging movement between open and closed positions; the door when closed being secured in said position by a releasable locking bolt assembly, indicated at 6, which connects between the free end of the door and adjacent portion of the housing. V

The housing at the top and on the inside is fitted with a rigid ring I whose inner surface slopes inwardly and downwardly as a deflector; said ring depending below the top edge of the door opening 3 and forming a stop for the upper portion of the door 4. A seal 8 is secured on said depending portion of the ring and against which seal the door engages.

The. bottom. of the housing is. open and is fitted with an annular, downwardly and inwardly sloping chute 9 which includes an attachment flange l0 secured withinthe housing adjacent its lower end. .A door stop I l is formed integral with and projects upwardly from the flange H1 in symmetrical relation to door 4; said stop including a seal l2against which the lower portion of said door engages.

At vertically spaced points between the ring I and the annular chute 9 the housing is fitted with horizontal rings [3, each of which includes an annular, downwardly and inwardly sloping skirt or ore deflector l4, said deflectors being relatively short radially of the mill. The rings M are attached to the housing by, means of bolts [5, except the lowermost one of said rings which is attached to the mounting of chute 9 by means of bolts I6.

Between the rings I3 the housing I is faced with annular ore disintegrating plates ll whose inner surface is deeply corrugated, the corrugatlons I 8 extending vertically. The disintegrator plates I! are attached to the sides of the housing 1 correct position on foot-.2 6. parent, "the shoe may be attached to the foot .26 i with the tongue 28 .seatedin either socket 2-9,

byQbolts l9. J'The portions of the rings l3, de flectors I 4, and corrugated disintegrator plates l1 which are attached to the door 4 are arcuate sections of said parts separate from the remainder, whereby they swing out with said door. 7

A vertical shaft disposed centrally in the housing isljournaled at its upper end in a dustsealed bearing 2| mounted on the top 2 the shaft projecting upwardly to a termination above said top. At its lower end the shaft is journaled in a bearing 22 supported by a spider 23 fixed inthe' annularchute 9.' v

In horizontal planes substantially equi-distant between the upper and lower edges of adjacent ore disintegrator plates I1,the shaft is fitted with corresponding rotary impact units. Each of these units comprises a split hub 24 clamped on the shaft 20, and a pair of legs 25 radiating from.

saidjhub in opposite directions. At its outer end each leg 25 is formed with a horizontal impact shoe-supporting foot 26 whichj'hasa'vertical but horizontalz-elongated face Fysaid face extending said ore.

offset relation to the shaft I; ore as fed through said opening and passing through the mill be ing deflected onto the rotary impact units by deflectors l4 and deflectors 3|. The rotary impact units, the shoes of different ones of which are disposed in circumferentially staggered relation, and which shoes substantially span the space between corresponding deflectors I4 and 3|, strike the falling. ore, and With high impact drive it against the disintegration plates l1, producing an eifective reduction in screen size of The assembly of rotary impact units is rotated at relatively high speed by shaft 20, which is driven in the following manner.

A heavy-duty electric motor 34 is disposed'to one side. of the housing I with the drive shaft 1 35 of the motor vertical and rojecting above thehorizontal plane of top 2.

Rigid brackets '36 project horizontally outwardly from the houslengthwise generally transversely of the direction 7 of travelgas indicated by the arrow in Fig,- 2, and with the inner end of said foot leading the outer endthereof.

A horizontal impact shoe 21 of substantially the between.

ing I in vertically spaced relation and to a termination adjacent the motor 34, said brackets supporting a vertical post 31' which extends there- Split bands 38 clampinglyjengage about the motor at spaced points and said bands each include ears 39 which surround the post 31 in'relatively turnable relation; said ears being engaged between the outer endeportions of the same length as thefoot is removably and reversibly secured against thefa'ceof the latter by the following arrangement. A single tongue 28, ofT shape in cross section, projects forwardly from the face F of foot 2$ and-extends fromthe to. a point slightly short ofthe center of said foot. As there is no tongue projecting from; the radially innermost half of the foot, the inner end radially outermost end of said foot along thesame of tongue 28 forms an abutment A...v Each shoe 4 21 is formed with a pair oflongitudinally alined.

sockets .29 o'peningto opposite ends of the shoe and separated'at.adjacentends by a stop S; the

sockets .2 9 being of the same length and formed.

to matchingly and selectively receive the tongue 2B in frictional engagement- The inner end or abutment A of tongue 2-8 seats against thecorresponding endof stop 5 when the shoe is in place and limits inward movement thereof to Thus, as is apand consequently either end of said shoe outermost; centrifugal force holdi'ng the shoe onthe I v -foot. In other words, the :shoe .21 is reversible, V 5 whereby when the initially outer end :thereof is badly Worn, the shoe may be reversed and the initially inner end then disposed'out'ermost for continued operation of the mill. As shown, the r shoe 21 is increased in thickness horizontally from-the center towards its ends along or ad-' responding end of the shoe is outermost, This feature is shown at 30; r V L 7 'Access to the above described rotary impact 1 units for the purpose of reversing the shoes 21. or replacing the same is hadthrough the door 4, and can be quickly accomplished with a miniinum of effort. 1 g

Between the rotaryimpact units, and above the bearings 22,, the mill includes frusto-conical deflectors 3| which have splitxhubs 32 secured on the corresponding portion of the vertical shaft 20; the loweredge of deflectorstl being spaced some, distanceghorizontally from and disposed in a vertical plane slightly below, the loweredge of the corresponding annular deflectors I4, A feed opening 3.3]is cut inthe top z of the housing .in

drive, unit 4|.

brackets whereby to prevent of vertical displacement of the motor, while supporting said motor for horizontal; adjustment about the post as an axis. a 1 r r lturnbuckle adjustment link 40 is,pi-votally connected in generallytangential relation betw en ;one of the splitband's 38 and an adjacent portion of the housing 1; said link connecting with said bandon the side opposite the brackets 36, whereby upon adjustment of the link the motor is swung in a horizontal plane relativ to the housing. An endless multiple belt drive unit;-

4I connects the upper ends of the shaft zll'and 35,,fconnecting the motor in drivingrelation to the rotary impact units. a

Adust-proof beltgu'ard and case42 is through an elongated'openingi 43 in theibo'ttoin of case 42 whereby to permitpf unobstructed horizontal adjustment of the motor by means of jacent thesid'e which is Zuppermost when the corlink l4, and-for the purpose of imparting the desired tension onthe drive unit 4|. In order 7 to prevent dust from gaining access to. case 42 a disc 44 is fixed on the upper end 'ofthe motor 34., and an annular seal -45 is secured to said discand slidably engages the bottom of. thelcase,

about'opening 43. A, i 7 From the'foregoin'g description itwill be readilyseen. that. We have produced sucha 'device' as substantially-fulfillstheobjectsj-of the inven tion as set forth herein. While this specification sets may be resorted tolas do not form. a departure from the spirit of the invention; as defined by the appended claims. 7

Having thus described our invention, what we desire to secure by claims as new and useful and Letters Patent is:

.1-. A reduction mill handing :a vertical 111idrical housing, a driven axial shaft in said hous ing, 'a-rplurality of rotary impact units mounted on the shaft verticallyspaced-relation, [corre-,;. sponding disintegrator plates mounted in the.

housing in spaced but adjacent, and surrounding.

relation to said rotary impact -un; i ts annular de V mounted on they top 2 of the housing and surrounds the; The motor shaft 35 projects.

forthzin detail the present and preferred constructionzof the device, i still in practice such deviations from such detail.

flectors mounted in the housing between the disintegrator plates, and other annular deflectors mounted on the shaft between said units; the deflectors mounted on the housing sloping downwardly and radially inwardly, and the deflectors mounted on the shaft sloping downwardly and radially outwardly, the innermost edges of the deflectors on the housing being in a plane radially outwardly of the adjacent edges of the deflectors on the shaft;

2. A reduction mill comprising a vertically disposed cylindrical housing, a driven axial shaft in said housing, a plurality of rotary impact units fixed on the shaft in vertically spaced relation,

annular disintegrator plates mounted in the hous- 15

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