US2256731A - Means for forming and segregating rock chips from aggregates - Google Patents

Description

Sept. 23,l l941. G. c. wlN-rHER 2,256,731

EMIS FOR FORMING AND SEGREGATING ROCK CHIPS FROM G'GREGATES l Filed.l July l0, 1939 3 'Sheets-Sheet l i t'torn 5.

SePt- 23, A1941. G, c. WINTHER MEAS FOR FORMING AND SEGREGATING. ROCK CHIPS FROM AGGREGATES Filed Juiy 1o, 1959 3 Sheets-Sheet 2 l:L'fr-LvePrior-'r Gf. C1 Wint hart Sept. 23, 1,941.

G. C. WINTHER MEANS FOR FORMING AND 'SEGREGATING ROCK CHIPS FROM AGGREGATES Filed July 10, 1939 5 Sheets-Sheet 5 Inventor: G. C. Win-t he?.

Patented Sept. 2.3, A1941 MEANS FOR FORMING AND SEGREGATING ROCK CHIPS FROM AGGREGATES George C. Winther, Minneapolis, Minn., assigner to Diamond Iron Works, Incorporated, Minneapolis, Minn., a corporation Application July 1o, 1939, serial No. 283,639

(Cl. isa-9s) 7 Claims."

My invention relates to meansfor forming and segregating rock chips from aggregates and has for its principal object to treat materials such as gravels containing a large percentage ,of rocks, boulders, pebbles and the like, or broken rock with crushers, sifters and conveyors, whereby what are known as rock chips are produced and to `separate from the mass being treated said rock chips. 1

Rock chips may be dened as small portions of rock having in general an angular shape'with numerous faces of ynot large all-over area and with more or less sharp edges and points. In modern road construction, particularly where asphalt or oil binders are used, there are two fundamental advantages in the use of rock chips. The first of these advantages is in the filling of voids formed in a roadway by normal broken rock aggregates. Such rock aggregates, being .quite large in individual pieces, assume positions wherein there are gaps or voids between and among these pieces. A thin layer of rock chips may be laid over such a surface and then rolled and will fill the voids and provide a comparatively solid base for the overlying asphalt or oil binder.

Another advantage is, in the use of rock chips with asphalt and oil binder roads, to provide a better traction surface on the road. In such roads it has been found that the road surface layer of sand, the theory being that the oil will' bind the sand to the surface of the road and sufficiently roughen it so that the tires of vehicles will hold the road. This, in practice, isV not only expensive, but is not very effective, sincey the oil dries away, traffic tends to pick up-and throw the sand particles, and heavy rain washes them off the road.

If however, the top surface of an asphalt or oil binder road can be made with what is known as rock chips, as above defined, it is found that the sharp angles of the rock chips push up at the surface so as to lift the surface and protrude slightly and in this way sufficiently roughen the road and provide anchored projections for tires slippery condition which otherwise makes them dangerous to drive over when wet.

In the normal preparation of aggregates for road building from different types of rock bearing gravels or broken rock, a certain percentage of rock chips is formed.' The difliculty has been to separate these rock chips from the umass of aggregate since there are not enough rock chips relatively in the whole mass of aggregate to perform the valuable functions above described, and these functions can only be realized by employing separated layers of the rock chips. There are no rock chips properly speaking, in gravels as they come from the pit from which by far the greater part of road building materials are derived. I have discovered however, that after the rock content of gravel has gone through the crushers, or after suitably broken rock has gone through ythe Crushers, -a percentage of angularwith other material, where they will not be available for the special use desired.

A chief object of my inventiongthrefore, is to provide means for separating the above described rock chips from the aggregate that has passed through the crushers before such aggregate has been delivered to the main conveyor which normally carries to the sieves the product of the crushers, and in conjunction with raw aggregate from the pit. In carrying out-this object I have v devised a means of receiving the aggregate as it comes from the crushers and delivering it to a specially constructed sifting means which simultaneously removes the rock chips developedin the crushers and passes the remainder of the aggregate to the main'conveyor carrying'the raw aggregate as it comes from the pit. v

It is a `further object of my invention to employ a vertical rotary lifting wheel which surrounds the main elevating conveyor and is located between the hopper ,for receiving the raw aggregate from the pit and the top hopper for delivering the mass of aggregate, from the crush- 'er and from the pit co-mingled,to the principal sifting and sorting means'.

It is a further object of my invention to proto grip, and tend to free such roads from the to the supplemental sifting device whereby the `rock Vchip's will be separated from the lmass of "plates 40 are secured to the ange supports 33' by means of bolts 40' and 40", the bolt 40' being threaded overa length suilicient to permit the In the drawings indicating an application of Y i lmy invention in one form:

Fig'. 1 is a side elevation part sectional view of `a portable aggregate making device embodying my invention. i

Fig. 2 is a rear end elevation view partly in `section with some elements omitted taken on `line 2-2 of Fig. 1.

Fig. 3 is a sectional elevation view taken through the vertical carrier and the rock chip sieve mechanism taken on line 3-3 of Fig. 1. Fig. 4 is a sectional view taken on line 4-4 of Fig. 2.

Fig. 5 isa fragmentary sectional view of the insertion of washers 4I' between plates 40 and angle iron supports 33' so as to have a desired range of adjustment of the angularity of plate 40 relative to druin 2l. This adjustment has important advantages for the handling of certain kinds of crusher aggregates. 'I'his arrangement is such that pockets 4I of variable angularity are formed against the drum 28 and between side flanges 33 and over partition plates 46 so that aggregate fed by conveyor I8 through the opening between the bottom edges of shields 34 and 35 is received by these pockets and carried upwardly to be discharged through a top opening, indicated at 42, between the upper edges of shields 34 and leccentric means for vibratingthe chip separating sieves.

Fig. 6 is a side elevation view of what is shown in'Flg. 2.

Fig. '7 is a vertical sectional view along the A'chip separating screens taken on line 1-1 of Fig. 2. .Fig's. 8 and 9.are plan views showingcharacter of the screens.

Fig. 10 illustrates in a general wayl the type of chips .which it is designed to separate from the mass of aggregate.

1 As illustrated'in the drawings, the frame II),

supporting Wheels II, inlet or receiving hopper I2, main conveyor I3, sieve hopper Il, sorting sieves I5, roller crushers I6, jaw crushers I1, and conveyor I8 underlying the crushers are or may be of well known construction. My invention relates to rthe means for handling and sorting the aggregate delivered to conveyor I8 from crushers I6 and I1.

A framing consists of front and rear sets of side posts I9 and 2li respectively secured at their bottoms to main frame pieces I0, Fig. 2, and which in turn may be suitably held together by ties such as 2i shown in Fig. 2. Mounted on these upright posts are sets of journals 2|, 22, Figs. 2 and 6, in which yare mounted shafts 23 on which are sets of supporting rollers 24 and 25 as clearly indicated in Figs. 2 and 6. Similarly mounted sets of guide rollers 26 and 21 are semi-cylindrical shields 3 4 and 35 supported by lower frame pieces 36 and upper frame pieces 31,

as clearly shown in Figs. 2 and 3. I'here is thus a bottom space between edge 38 of shield34 and edge 38 of shield 35 'open to receive aggregate from the crushers delivered thereto'by conveyor I8. The drum has secured to its side4 anges 33 a series of angle iron members 3,9' which are positioned to support adjustable partition members 40, Figs. 3 4and 11, extending between the side flanges 33 and tipped at a forwardly extending angle relative to the drum face 23. `The 35. Andthe margins of opening 42 areextended inwardly by pieces 43 and 44 forming parts of the angle iron supports 31.

The result of this arrangement is that when the vertical lifting member 23 isrotated on its supporting rollers while4 conveyor I8 is delivering aggregate through bottom opening between edges 38and 39 of shields 34'and 35 said aggregate will be lifted from the bottom of the vertical lifting `drum 28 tothe top thereof to'be passed through the top opening 42. From there it falls upon a screen or sifting mechanism 45, which is shown in side elevation in Fig. 6, in end elevation in Fig. 2, and in longitudinal section in Fig. 7.

This sieve is mountedto vibrate within the inner circumference of the vertical lifting drum 28 and directly above and along the main conveyor` I3,which, as shown in Fig. 1, passes through the central opening yof the lifting drum 28. The sieve provides an upper hopper formed by upper side and driven from a pulley 54. 'I'he shaft 5I.has

- tinuation 56 of Ashaft 5I runs through a cylindrical Y provided toward the top of respective sets of shields 46 and 41, with a sieve structure at the bottom of said hopper. The side shields 46 and 41 are secured to hub members 46 and 49, Figs. 2 and 5, which have within them a cylindrical seat 49 engaged by a cylindrical roller 50 on a shaft 5I which is supported in bearings 52, 53, Fig. 2,

thereon an inertia fly wheel 55 and is eccentric with respect to roller 50, as clearly shown by center lines A and B in Fig. 5. An enlarged conhousing 51 across the hopper formed by the side walls of shields 46 and-41. A cap 58 houses and seals in the rollers 50, Fig. 5. l

The assemblage is supported by bracket arrangements 59 and 60 bolted to the frame members I9 on each side of the hopper construction. These brackets are provided with ledges 6I and 62, Fig. 2, on which are mounted front pairs of springs 63 and rear pairs of springs 64, Fig. l6. These springs are secured to or engage with supporting extensions 65 on the side members 46 and 41. In this manner the main weight of the screen assemblage 45 is supported upon the eccentric rollers 50 with the sets of spring members 63 'and 64 holding the screen assemblage against excessive oscillation on the rollers 50. It follows v that when the shaft 5I is rotated, rotating with it the eccentrically mounted rollers 50, the whole screen assemblage will be given a desired vibrating movement, which will cause particles of a size to pass the screens to go through, and, since the screens slope downwardly, Fig. 7, will cause material which does not pass the screens to be moved to the discharge ends thereof. n. -7

The screen itself is shown in Figs. '1, 8 and 9.

The top screen comprises two contacting portions 66 and 61, of which the member 66 is the have le" xl et" openings, andthe screen II is i l a,ase,7s1

real screen with a mesh which, for example, may

really only a support for screen Il, having a mesh 'I'he lower screen Il,

so separated to the main conveyor.

sifting assemblage embodying means for separating rock and chips from the mass of aggregate and for returning the crusher aggregate not 2. A'machine for obtaining lrock chips from aggregates that have passed a crusher compris- Fig. 3. 'Ihe material which goes through all the screens, including screen Il, also discharges directly upon the main conveyor belt as it moves through the center of vertical lifting wheel 2l.

The chipsseparated from the aggregate pass through a discharge chute 'Ilhaving a sloping bottom 1I which is securedl to the edge of the sieve assemblage 4l, as clearly shown in Figs. 2 and 7. The mouth12 of chutell overlies a sloping discharge chute 'I2 and vibrates within it. Figs. 2 and 6k whereby the sorted chips are delivered at the de of the machine. Side members 'Il and carried by bracket assemblages 59 and 60, extend toa point close to the main elevating conveyor I3 to guide the material passing through upon the conveyor and prevent its scattering at the sides.

Fig. illustrates the general type and shape of chips, as indicated by the several forms of is a comparativelyl small output of these chips,

perhaps ten per cent of the usable aggregate,

ing a main elevator, a lifting elevator wheel surrounding the main elevator, means for delivering aggregate from the crusher to the elevator wheel, and means interposed between the elevator wheel and the upper surface of the main elevator for separating `the rock chips from the crusher aggregate going to the mainv elevator and for delivering said chips outside the ma- 'chips 16, 11, 1l and 1l, there shown. There- 3. A machine for 'obtaining rock chips from aggregates that have passed a crusher, comprising a 4main elevator, a vertical lifting elevator wheel surrounding the main elevator, means for delivering aggregate from the crusher to the elevator wheel, a sifting assemblage interposed between the elevator w'heel and the upper surface of the main elevator and extending transversely of the elevator wheel and along the main elevator for receiving the crusher aggregate and separating and delivering outside the rock chips while permitting the aggregate not so separated tobe returned to the main elevator.

4. A machine for obtaining rock chips from aggregates that have passed a crusher comprising a main elevator, a lifting elevator wheel sur-- rounding the main elevator, means for deliveringl aggregate from the crusher to the elevator wheel, a sifting assemblage interposedbetween the elevator wheel and the uppersurface of the i. main elevator and along the main elevator for advantage comes from the fact that this isl accomplished by reason of its association with a vertical lift device without any material increase in the overall length on the machine and with no increase at all in its height, factors of great importance in connection with a portable machine for obtaining road-making aggregates. A feature of the machine which aids in securing these important advantages is the mounting of the vertical lift-wheel about the main elevator,

l. In a portable machine for forming 'aggregates, a main frame, a main conveyor supported 'by said frame and extending angularly from a lower to a higher position, a hopper for delivering aggregate to the lower end of said main frame, a second hopper for receiving aggregate from the upper end of said conveyor, a transverse lifting wheel located betweenthp said .hoppers and surrounding the main conveyor, a crusher adapted to receive aggregate from the upper hopper, means for moving crusher aggregate from said crusher to the transverse lifting wheel, a sifting assemblage having a portion located receiving the crusher aggregate, and for separating and delivering loutside the machine the rock chips while permitting the aggregate not so separated to be returned to the main elevator, and means supporting said sifting assemblage located adjacent but outside the limits of said lifting wheel so that a portion of the sifting assemblage extends across the transverse extent of the lifting wheel.

5. A machine for obtaining rock .chips from aggregates that have passed a crushencomprising a main elevator, a lifting elevator wheel surrounding the main elevator, means for delivering aggregate from the crusher to the elevator wheel, a sifting assemblage interposed between the elevator ywheel and the upper surface of the main elevator and along the main elevator for receiving the crusher aggregate and for separating and delivering outside the machine the rock chips Vwhile permitting the aggregate not so separated to be returned to the main elevator, and means ,supporting said sifting assemblage located adcrushers, a second sifting device located above.-

the main conveyor and above the end of the second conveyonmeans for moving aggregates from 'the second conveyor to and upon the second sifting device, and means. associated with the Isecond sifting device for separating rock chips from the body'of aggregates, and to permit delivery ofthe remainder of the aggregates upon the main conveyor,v and' means operative to discharge the separated rock chips outside the machine.

7. In a portable ,machinel for forming aggreexcept to leave top and bottom openings thereto,

said first-named conveyor delivering to the lifting wheel through said bottom opening, a main conveyor extending through the lifting wheel between said top and bottom openings, a sifting device extending through said'central opening above said main conveyor and receiving mate# gates including rock crushers and a conveyor for taking aggregates from the crushers, a. transverse lifting wheel to which said conveyor de- 1iverssaid transverse lifting wheel having a central opening free of obstruction, shields extendling around the sides of the opening through said lifting wheell to close the inside of the same

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