US882256A - Centrifugal sand-drier. - Google Patents

Description

G. S. LEE.

CENTRFUGAL SAND D APMIUA'HOH ULEB JULY 11 QR); tv l cranes nh L.. .www1 @MARY N PTENTED MAR. 17, 1908.

GBNTRHLIGL SAND DRIE APPLICATION Smm JUL 2 SHEETS-SHEET Z.

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CHARLES `STEWAR'l` LEE, OFBALTIMORE, MARYLAND, ASSIGNOR TO FRANK G. TURNER, OF

^ BALTIMORE, MARYLAND.

- CE NTRIFUGAI.. SAND-DRIER.

Application filed `Tuly 11, 1907.

Specification of Letters Patent.

Patented Mai-cil i7, 190e.

Serial No. 383,314.

, To all whom "it 'may concern:

l Be it known that I, CHARLES STEWART LEI, a resident of Baltimore, Maryland, have invented a new 'and useful Improvement in Sand-Driers, which invention is fully set forth in the following specification.

The present invention relates to sand driers, and more particularly is a device of this character in which the .water lis ,expelled Ylo by centrifugal force at the same time that the sand is continuously fed therefrom.

VHeretofore in the treatment of sand, and

particularly that used in the fabrication of glass, it has been customary after the sand is v subjected V to the necessary washing, to store thel sameiin a large receptacle or bin for the pur ose of permitting the sand to drain until su, cient of the water has passed tlierefroiu to permit the sand to be passed into the heat 'Z'oj'drier from which it must be expelled in a perfectly dry state. This draining receptacle or bin, in'establishments of this character, oc- -eiiies at least half the licor space of the building., and the sand must remain therein at least twenty-four hours before it is at all in condition to be passed into the drier. lThe usual way of transporting the sand from the draining receptacle to the drier is through the medium of an endless belt onto which the sand is shoveled by the attendants, this shoveling involving considerable time and ex ense.

, Ehe sandv in the draining receptacles after standing for twenty-four hours is of vvarying 3K5 degrees `of wetness, increasing towards the 4o insufficient to so dry the sand from the lower layers, and accordingly it is necessary to fire --np more and more as the bottoni of the pile is reached and the sand becomes wetter and wetter, until -finally the temperature under 4.5 the drier is so high as to have the metal thereof at a white heat. Such a condition of things results in the consumption of large .uantities of fuel, requires the presence at i t e drier of skilled attendants and renders short the life of the expensive driers used;

and it is the object ofthe present invention to entirely dispense with the draining receptacle and all its attendant incidents and expenses and to so treat the sand as to present 4,5 it tothe drier :it a uniform degree of dryness.

whereby the temperatuie'under said drier may be maintained at a lower, certain, constant amount with a consequent large saving of fuel, al prolongation of the life of the drier, an increased and more satisfactory output and the need for less skilled. labor. Briefly stated/these objects are effected by provid ing an improved drier consisting of a perforated cylinder entirely open at both ends and of uniform bore throughout, into which the sand is passed directly from the washers, and which is arranged to be driven 'at ahi h rate of speed to expel the water from t e sand by the action of centrifugal'force; a stationary conveyer of the screw type mounted therein, which acts in conjunction with the revolving cylinder to feed the sand forward; the whole being arranged within an impcrforate outer casing'. The 'said perforated cylinder is supported by bearinvs engaging the periphery thereof and is dbriven y means likewise engaging the periphery thereof-this in order that the ingress and egress of the sand may be unobstructed, the bearing and driving surfaces protected from the sand and water, thev device so sim li'fied as ,to eliminate the danger of clogging y the wet sand, and so that the sand may be trcat ed in quantities sufliciently large as to render the device commercially successful. T his drier discharges the sand onto the conveyer Ibelt heretofore used for transporting the sand from the draining receptacle to the heat drier. l

The invention will be better understood by reference to the accompanying drawings, wherein, f

Figure 1 is a longitudinal section, the screw conveyer being' shown in elevation; Fig. 2 is a section on line 2--2, Fig. 1; and Fig. 3 is a top plan view. Y

Referring to the drawings, l is animperforate metal casing of any suitable construction, and here shown as formed lin ,two sections, provided with a drain 2 for carrging off the water expelled from the sand. rejecting through said cylinder 1 is a .cylinder 3 perforated where surrounded by cylinder 1 and of uniform bore throughout, into one end 0f which the sand is fed from the'washer (not shown) in any suitable manner, as through chute 4. The ends of said cylinder 3 are provided with irnperforate bearing strips 5 of a thickness greater than that of`said cylinder, said strips being either formed integrally portions 12 ofV said bearing strips 5 to prewith said vcylinder or formed separately and secured thereto. These strips engage in suitable bearing-s 6, preferably metallic, andl here shown as of the two-part strap ty e, this arrangement of bearings leaving t 1e ends of the cylinder entirely open and unobstructed and the bearings and driving surface out of the way. The-parts of said bearings are held together by suitable connecting means, such as bolts 7, and' are supported by arms 8 of standards 9, said bearings being vprovided withflanges 10 arranged, if desired, to besecuredgto cylinderl b.y bolts 11, whereby said cylinder is fixedly he d in position. The cylinder l-engages at these points in cut-away vent any water or sand getting between the bearings and the rotating cylinder.

Cylinder 3 which in operation 'revolvesat a high rate of speed-QOO revolutions to the minute have been found to give excellent re- `sults--is driven by mea'lns engagingthel peri hery of one of the projecting en s thereo --prefe'rably a belt 12,.A connected to any, suitable source of (power, engaging one of the bearing strips 5 a jacent to one ofthe bearings 6. Vlvithin said cylinder 3 is mounted a suitable conveyer 13 of the screw type, and here shown as of the tri le-fiightfvariety,

said conveyer being fixed y secured (as by spline 13') to shaft 14 which projects at* either. end from cylinder 3 and is supported on standards 9 in a manner to prevent rotation7 as by bolts 15 engaging 1n recesses in said shaft. The edges of-,the blades of the conveyer do not contact with the cylinder 8 but an appreciable space is' provided therebetween.

The operation of the device is as follows:

Cylinder 3 having been started to rotate at.

about 900 revolutions to the minute, sand from the washers, heavy with water, is fed into one end thereof through chute 4. As.

soon as thesand touches the rapidly revolvtherefrom through the perforations in said l cylinder, by the action of centrifugal force,

and the layer of sand on the inner surface of the cylinder rapidly deepens until the space between said cylinder and the edge o the rst conveyer blade is filled. The continued rotation of the c linder then results'in the4 'in' a veryrapid and'satisfactory feed of the,

sand lthrough the cylinder, so that v a devicejief ing cylinder the water begins to be expelledvthe huge draining receptacle is eliminated;

the time, trouble and large expense'which was heretofore involved in shoveling sand soy from the draining receptacle onto the con- 1 veyer belt which carries the sand to the heat drier is obviated; the sand issues from the vrotating cylinderof'this device yalways at the same degreeof dryness-Which is very much drier than the driest sand of a pile which has ydrained for twenty-fourhours-,and accordingly the degree of heat to be maintained under the drier, v besides being lower `than heretofore, `may be fixed'and constant, resulting in a large saving of fuel, prolongation of the life of the drier and the necessity for less" skilled labor and less attention.

Thile the a paratus has been herein described particu arly with relation to the drying or draining of sand, for which it has been especially designed, it may obviously be used lfor the drying or draining of other materials.

What is claimed is: l. A combined drying and conveying device comprising a fixed im erforate casing,

a rotatable perforated cy 'nder contained therein anda stationary screw conveyer supported in said perforated cylinder. y

I 2. A combineddrying-and conveying device comprising a fixed imperforate casing, a perforated cylinder passin therethrough and entirely open at the disc arge end thereof, bearings for said cylinder engaging theyperiphery thereof, means for rotating said l l cylinder also engaging the periphery thereof,

and a stationary screw conveyer contained in said perforated cylinder.

3. A. combined dryin(r na vice comprising a fixed L:cribrate casing, a perforated cylinder of uniform bore throughout and-.entirely open at its dischargeend passing therethlrough, b earings for said cylinder engaging the periphery thereof', means for rotating said cylinder also engaging the periphery thereof, and a stationary screw conveyer contained in said perforated. cylinder. l

4. A combined drying and conveying device comprising a fixed imperforate casing, a perforated cylinder contained therein and entirely open at both ends, bearings for said cylinder engaging the periphery thereof,

."'rn'eans for rotating said cylinder also engagc conveying Ade- 1'.

ing the periphery thereof, and a stationar;v screw conveyer support-ed in said perforated cylinder.

5. A Combined drying and Conveying; de- Vice comprising a xed imperfnrate casing, a perforated cylinder of uniform here throughout and open at bot-h ends passingr therethrough and provided at each end with a thickened bearing surface, bearings for said cylinder engaging ysaid hearing;r surfaces, ineans for rotating said cylinder also engaging one of said bearing surfaces, and a stationary screw conveyer supported in said perforated cylinder.

6. A combined drying and conveying device comprising a fixed impeorate casing, a perforated cylinder of uniform bore throughg out and provided at each end with a thick-- ened hearingr surface, hearings 'for said y1- inder engaging sind hearing surlaces and provided with llanges, ineans securingy `said llanges lo Isaid ilnperiorate casing, means for rotatingr said cylinder also enejaginer one ol said bearing surfaces, and a stationary triple-flight screw conveyer supported in said perforated cylii'ider.

In testimony whereof I have signed this specification in the presence of two subscril ing Witnesses,

CHARLES STEVART LEE.

Witnesses:

M. S. HARRISON, VILLIAM B. KERKAM.

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