US2074233A - Combined crusher and screen - Google Patents

Description

o. .1. MOUSSETTE; SR 2,074,233

'March 16, 1937.

' COMBINEbQRIJSI-IER AND SCREEN Filed July 22, 1955 s Sheets-Sheet 1 -J Mo -1661952261.

March 16, 1937. o. J. MOUSSETTE s j ,2 I COMBINED CRUSHER AND CREEN Y Filed July 22, 1935 L 3 Sheets-Sheet 2 mmmw ,\\\\\\\\\\\I ill/[10 27. I a g g j 0 J Mo wJ-seik, Jr.

a I um March 16, 1937. o. J. MOUSSETTE, SR ,9

COMBINED CRUSHER AND SCREEN I Filed July 22, 1935 3 SheetsShet 3 Patented Mar. 16, 1937 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to combined crushers and screens of that general class shown and described in U. S. Letters Patent issued to me on the 22nd day of February, 1916 under No. 1,172,626, and of which the present invention is an improvement.

The object of the invention is generally to improve and increase the efficiency of the machine and to reduce the cost of manufacture thereof by mounting the tapered ends of the drum in bearings on the supporting frame and rotating said drum by a drive belt extending over a pulley connected directly with the drum.

A further object of the invention is to terminate one end of the inner or coarse screen of the drum in spaced relation to the outer or fine screen, whereby to permit the coarse material between said screens to be directed back into the drum for regrinding. 1 r c A further object is to provide a plate or closure at one end of the drum adjacent the bearing thereof so as to confine the material being treated to the zone of action of the crushing rollers and thus prevent the entrance and lodgement of fine material within the hollow journal.

A further object is to provide a yieldable pack-- ing strip carried by the casing or housing and against which the drum bears while rotating so as to hermetically seal the casing and prevent the escape or waste of the pulverized material during the grinding or crushing operation.

A still further object of the invention is to provide the casing or housing with a sliding gate or closure to facilitate obtaining access to the interior of, the drum and its associated parts.

Further objects and advantages will appear in the following specification.

In the accompanying drawings forming part of this specification and in which similar numerals of reference indicate corresponding parts in all the figures of the drawings,

Figure 1 is a side elevation of a combined crusher and screen embodying the present invention.

Figure 2 is a vertical sectional view,'taken on the line 2-2 of Figure 3.

Figure 3 is a vertical sectional view, taken on the line 33 of Figure 2.

The improved crusher and screen forming the subject-matter of the present invention is principally designed for crushing, screening and reclaiming gold, silver, brass and other metals from dry materials, such as crucibles, jewelry sweeps, and the like and comprises a supporting frame 5 including spaced uprights 6 connected by diagonal braces I and on which is supported a hollow frame 8. Extending vertically from the hollow frame 8 are spaced standards 9, the upper ends of which are fashioned to form bearings [0, each bearing being provided with a cap piece I I detachably secured thereto by bolts or similar fastening devices I2.

Mounted for rotation in the bearings I0 is a crushing drum, indicated at l3, said drum being preferably formed in sections with the outer or:

end sections provided with reduced cylindrical ends it fitting within the bearings l0 and constituting hollow journals. Disposed within the drum I-3 and bearing against the intermediate portion l5 of said drum are lining plates I6, preferably formed of hard steel, and loosely mounted within the drum and bearing against the lining plates I'B are conical crushing rollers l1 preferably pivotally connected at I8 to permit them to conform to the inclination of the lining plates. The intermediate portion l5 of the drum is also preferably formed in two sections, the outer ends of the sections being provided with upstanding flanges l9 and 20, one of said flanges being fastened by bolts 2| to the'adjacent end section of the drum and the other flange 20 being wider than the flange l9 and bolted or otherwise detachably secured at 22 to a belt pulley 23, preferably formed separate from the adjacent end section of the drum. and fitting snugly about the flange thereof, as best shown in" Figure 2 of the drawings. Surrounding the drum is a casing 01 housing 24 comprising mating sections having laterally extending attaching flanges 25 pierced by fastening bolts 26, said casing being stationarilysupported on the frame 5 and having its lower end terminating in a discharge spout 21 extending within and below the upper member 8 of the supporting frame to permit the discharge of the contents of the drum into a suitable receptacle. One end of the drum is closed by a removable cover plate 28 hingedly mounted on a bracket 29 in the manner shown and described in my patent previously referred to and the material to be crushed is introduced within the drum by opening the closure plate 28; as will be readily understood.

The sections of the intermediate portion N3 of the drum are bolted together at 29 and thence extendedlaterally to form a semi-circular trough 30 entirely surrounding the drum. Disposed within the trough and mounted for rotation with the drum are spaced screens 3| and 32, the inner screen3l being of a relatively coarse mesh and the outer screen 32 of a finer mesh, the outer screen 32 discharging directly into the casing or housing 24, asshown. Mounted for rotation with the drum is a receiver or trap 33 having diverging branch passages 34 and 34' which communicate with the interior of the drum through an opening 35. The trap is provided with oppositely disposed extensions 36 to which are soldered or otherwise rigidly secured the adjacent ends of the outer screen 32. One end of the inner screen 3| is secured to. one ,of the: extensions 36.

while the other end of the screen is spaced from the other extension, as indicated at 31, so as to permit the material which is too coarse to pass through the outer screen 32 to be directed into the passage 34 and thence into the interior of the drum for regrinding. It will thus be seen that the screens 3| and 32 are united and closed on one side of the trap by the extension 36, while the end 31 of the screen 3| on the other side of the trap is separated from the adjacent extension 36 so as not to interfere with the flow of material back into the drum. The trap 33 is provided with spaced clean-out openings having closure plates 38 detachably fitted therein.

Disposed within the drum at the inner end of one of the hollow journals I4 is a plate 39, the purpose of which is to confine the material to the zone of action of the crushing rollers I! and thus prevent entrance of the material within the hollow journal during the crushing operation. If the plate 39 were not provided, fine material would find lodgment against the inner wall of the hollow journal l4 and necessitate frequent detachment of the cap plate 40 in order to clean out the journal and recover the metal deposits therein. This plate 39 not only acts as a closure for the journal I4 but also as a baflle against which the material strikes and is deflected laterally against the crushing rollers. Extending transversely across the trap 33 at one of the diverging passages thereof is a plurality of spaced transverse pins 4| which constitute a partial barrier and serve to arrest the passage of relatively large particles of material so that as the drum rotates, these large particles of material will fall by gravity through the adjacent passage 34 into the drum for recrushing.

In order to prevent the escape and loss of pulverized material during the crushing operation, there is provided packing strips 42 secured to the casing 24 on opposite sides of the trough 30 with the free ends of the strips extended laterally for contact with the drum as the latter rotates and thus insures confinement of the pulverized material and dust Within the casing and the recovery of the said material through the spout 21.

The casing 24 is formed with arcuate guide flanges 43 disposed on opposite sides of a discharge opening 44, said discharge opening be ing normally closed by a gate 45 which slides w thin the flanges 43 so that by moving the gate 45 to open position, access may be readily obtained to the drum to permit removal of the closure plates 38 for the purpose of cleaning the interior of the drum after the crushing operation.

In operation, a drive belt is trained around the ulley 23 and operatively connected with a motor or other suitable source of power for rotating the drum, which latter rotates in the bearings ID, as previously stated. The closure plate 28 is then moved to open position and the material to be crushed, such as crucibles, factory sweepings and the like introduced within the drum through one end thereof. The plate 28 is then closed and locked in closed position and motion imparted to the drum through the medium of the drive belt. As the drum revolves, the material therein will be crushed by the members I? and will be thrown outwardly by centrifugal force within the passage 34'. The larger particles of material will find lodgment against the barrier pins 4| and drop back by gravity within the drum, while the smaller particles will pass between the pins 4| in contact with the inner or coarse screen 3| and pass therethrough to the outer or fine screen. Any material too large to pass through the coarse screen 3| will be carried around with the drum to the adjacent by-pass or passage 34 and delivered through the opening 35 to the drum for regrinding. The material after passing through the coarse screen 3| will pass through the outer or fine screen 32 and be discharged into the casing 24 where it will be directed by the spout 21 into a receptacle designed to receive the same. The material which is too coarse to pass through the outer or fine screen 32 will travel in the passage between the inner and outer screens 3| and 32 until it reaches the end 31 of the inner screen where it will be directed by the adjacent passage 34 through the opening 35 into the drum for regrinding. It will thus be seen that owing to the construction and arrangement of the screens, material which is too coarse to pass through either the inner or outer screen will be directed back into the drum for recrushing, this being due to the fact that the end 31 of the inner screen is not closed so that the coarser material is free to again enter the drum for recrushing or regrinding as the latter revolves.

As the drum is mounted for rotation in the bearings ID, the use of a drive shaft and supporting rollers at the base of the machine is eliminated and a consequent saving in the cost of manufacture effected. Furthermore, as the packing forms a hermetically sealed joint between the casing and drum, there is no loss of the pulverized material during the grinding operation so that the efficiency of the machine is consequently increased in this respect.

A machine constructed in accordance with the present invention is very simple and easy to 0perate and may be produced at a low cost and will be found highly efiicient for the purpose for which it is designed.

Having thus described the invention, what is claimed as new is:

In a combined crusher and screen, a supporting frame, standards carried by said frame and provided with bearings, a drum having a hollow body provided with external annular flanges at its ends, hollow frusto-conical end sections provided with external annular flanges about their inner ends secured against the flanges of the body, the flange at one end of the body being of greater width than the adjoining end section and projecting radially therefrom, a pulley secured against the outer side face of the projecting portion of the last-mentioned flange of the body and fitting snugly about the flange of the end section secured thereto, said end sections having hollow cylindrical extensions open at their outer and inner ends and constituting journals rotat-ably mounted in said bearings, removable closures for outer ends of said journals, a removable plate for closing the inner end of one journal at its junction with the companion frustoconical end section and preventing material from entering the journal, crushing means in said drum between the end sections thereof, a screen

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