Abstract: The invention relates to the dry cleaning of grain and discloses a new process and an apparatus. In the new process a deep layer of grain is formed on an upper screen, the holes of which are larger than the grain particles, and a compacting effect is produced in the bottom zone of the layer by vibratory forces. Sand particles sink into the layer compacting near the screen, and this layer drops completely--i.e. together with the sand particles--directly on to a second screen situated therebeneath. The sand passes through the bottom screen. The double screen is preferably preceded by a coarse screen. The apparatus is modular and comprises as separate modules a screen box, a head section containing the grain inlet and a tail section containing the outlets. A number of screen boxes of different sizes and head and tail sections of different sizes and arrangements may be provided to make it possible to supply a number of screening systems of different sizes.

Abstract: A sizing screen for particulate material of different sizes has a generally horizontal rotatable circular screen surface having a plurality of elongate radially projecting members, first collection means positioned adjacent the outer periphery of the surface for collecting an oversize fraction of the particulate material, second collection means positioned below the surface for collecting an undersize fraction of the material which passes through the screen. Discharge means comprising a rotatable table partitioned into different parts for carrying the oversize and undersize material is positioned below the first and second collection means. A plough or paddle preferably urges material from the table into outlets. The screen is suitable for handling sticky material such as coal fines and clay.

Abstract: Screening apparatus for fractionating material suspensions has a screen gap which is defined by a rotatable member and a stationary member. One of these members is provided with at least one projection which extends into the screen gap to inhibit clogging of the gap with coarse suspension materials. Any coarse suspension materials stuck in the screen gap can be removed from the screen gap by a wiper element extending from the rotatable member and overlapping the screen gap.

Abstract: A pressurized screening device has two pairs of concentric cylindrical screenplates, one pair mounted coaxially above the other in a common housing. Each pair of screenplates has a separate rotary impeller mechanism, the impellers being mirror images of each other. The pair of screenplates share a common central feed chamber, common accepts chamber, and a common drive for the two rotary impellers. Each pair of screenplates is provided with a separate rejects collection chamber, one located at the base of the housing and the other located near the top of the housing. This arrangement permits both high capacity operation as well as efficient removal of heavy and light impurities from a feed stream.

Abstract: A vibratory apparatus for use in association with a vacuum casting apparatus wherein the box containing the sand and casting upon completion of the vacuum casting is moved on track means to a vibrating station where it is lifted off the track, tilted, and vibrated to discharge the sand and separate the sand from the casting.

Abstract: Pressure sorting method and apparatus in which the velocity of the rejected suspension component along the screen surface in a substantially direct path to a rejected suspension outlet has a vertical velocity component which is a multiple of the velocity of the accepted suspension through the screen openings by virtue of the cross-sectional area of the unsorted and rejects annular chamber at the inlet end being less than one third the sum of the clear cross-sections of the screen openings. The velocity ratio is maintained by decreasing the area of the annular chamber from the inlet to the rejects outlet. In a preferred embodiment, the accepts annular chamber increases towards the accepts outlet to compensate for the decrease in the unsorted and rejects annular chamber area.

Abstract: A screening machine having an improved seal operable between the stationary inlet and outlet conduits of the machine and the movable inlet and outlet ports of the screen enclosure. The improved seal comprises a low friction slideable ring movable relative to a slide surface on one or the other of the conduit or the screen enclosure.

Abstract: A grain cleaning apparatus having an upstanding housing with a grain inlet, at least one layer of screens disposed below the inlet and a foreign material receiving chamber disposed below the screen, with separate outlets for foreign material and cleaned grain and integral means for bypassing a selected, infinitely variable, between limits, proportion of incoming grain flow around the screens to the grain outlet.

Abstract: A sizing screen provided with feeder means for causing an even distribution of material onto the screen surface. The feeder means comprises a generally spirally shaped plough which urges material over the edge of a generally circular table the distribution of material being substantially uniform over the edge. The plough has a compaction zone for compacting the material so that urging forces exerted by the plough are not absorbed in the material. A chute which can be stepped feeds material onto the table through the plough.

Abstract: Sifting equipment for fine-grained bulk material, particularly flour, provided with a transit chamber inserted in the transmission line of the bulk material and containing a sieve, exposed to the action of a blower, is improved by having the transit chamber (9) mounted vertically as regards its lengthwise axis.

Abstract: A classifying apparatus for a suspension, especially for a pulp suspension, having a screen drum, means for feeding the suspension to one side of the screen drum, for removing thickened suspension from the same side of the screen drum and liquid from the opposite side of the screen drum, blades inclined in relation to their direction of rotation so that any one of the ends of the inclined blades is substantially on the same screen drum line parallel to the screen drum axis as the opposite end of some other blade and fitted to sweep at least one surface of the screen drum, and driving means for moving the blades in relation to the screen drum.

Abstract: A frusto-conical screen separator having its longitudinal axis inclined from the horizontal so that its undersurface lies in an essentially horizontal plane, the separator being divided internally into three zones, the first zone comprising a dewatering zone at its largest diameter end, the second zone comprising a washing zone, and the third zone comprising a final dewatering zone at its smallest diameter end, the separator having external shower means overlying the first and second zones, breaker bars in the first zone, internal baffle means in the second zone, and guide bars in the third zone, the materials to be separated passing through the separator from its larger to its smaller end, a recovery tank underlying the separator for recovering separated materials passing through the screen, the unscreened residual materials being discharged at the smaller end of the separator.

Abstract: Method and apparatus for pulping and grading waste material in which the waste material is introduced into a cylindrical chamber having two end walls with a perforate screen in one of the end walls. An impeller in the chamber adjacent the perforate screen provides for pulping and pumping of the stock as well as provides rotational movement of the stock within the chamber. Lightweight rejects are continuously removed through an outlet centrally located in the end wall opposite the screen and heavy rejects are removed through an outlet in the cylindrical wall adjacent the end wall opposite the screen. The stock is introduced to the chamber through an annular inlet which surrounds and is coaxial with respect to the lightweight rejects outlet line.

Abstract: A machine for receiving mixed concrete from a ready mix truck provides a receiving hopper and an elevator for lifting the material therefrom arranged to discharge it into a classifying rotating drum incorporating a spiral conveyor into which water is sprayed during use. A sump and a secondary conveyor are positioned beneath the classifying drum so that the separated sands, aggregate and other material, washed and separated from the concrete mix, introduced with the cement and waste water are confined to the sump and a separate settling tank from which the fine sands and similar materials can be salvaged.

Abstract: Apparatus for the refinement of colloidal asbestos dispersions comprises a horizontally disposed cylindrical tube having a plurality of closely spaced holes around the periphery thereof, a helical screw disposed within the tube, and a flanged jacket concentric with and spaced outwardly from the tube. A slurry of unrefined dispersion is continuously fed into the tube to fill it. Refined slurry is drawn through the holes by a suction pump connected to the jacket while contaminants are retained in the tube and moved by the screw to the outlet end of the tube where they are compacted and removed as sludge through a spring loaded discharge door.

Abstract: A method of screening paper fiber stock incorporating a screen member having generally circular perforations and a rotor supporting vanes movable in the supply chamber, the rotor vanes are spaced from the screen member by a substantial distance (3/16"-1/2") to establish a tubular layer of stock of corresponding radial thickness adjacent the screen member, the rotor is operated at high speed to develop strong hydraulic shear forces in the tubular layer of stock causing tangential orientation of predominantly two-dimensional contaminant particles, and ribs on the inlet side of the screen member cause the stock to be continuously recirculated in the supply chamber to prevent undue increase in the consistency of the stock in the tubular layer, thereby enabling the screen to operate effectively at high capacity and high stock consistencies.

Abstract: A fiber classifying mechanism and method including a first chamber having an inlet for receiving fibers to be classified carried in a fluid suspension and having an outlet from the same chamber. A second chamber receives a controlled split of flow from the first chamber through a screen between the chambers having openings of a size to pass reject fibers. Means are provided for controlling the split of flow by a valve in the outlets from the respective chambers so as to control the flow through the screen. A foil moves past the screen to agitate fibers collected on the surface of the screen.

Abstract: In a screening machine of the type having a perforated cylinder through which the material being screened is passed and a rotor for maintaining the cylinder perforations open, failure of the cylinder due to torsional forces imposed on it by rotation of the rotor is prevented by providing several beam-like cantilevers which extend longitudinally of the cylinder and resist the twisting, torsional forces imposed on the cylinder during screening operations. Intermediate reenforcing rings, which are designed to withstand radially directed loads imposed on the cylinder, are restrained against movement longitudinally of the cylinder by means of clips which are welded to the cantilevers on opposite sides of each of the rings. The cantilevers, therefore, also serve as an area on the cylinder to which the clips can be welded, eliminating the necessity of making welds at undesirable locations near perforated portions of the cylinder.

Abstract: An enclosed particular dry product is conveyed through a conduit by a gaseous fluid formed by a vacuum blower. Metered hoppers feed the product into the conduit. A cyclone removes the product from the fluid and conveys the same to a separating screen. The desired size product is recovered and passed through a flexible sock to minimize breakage and loaded into a vessel. The undesired size is fluid conveyed to a recovery receptacle.

Abstract: Liquid manure from an open pit is swept into the tubular housing of a loader by an impeller that rotates adjacent the housing inlet in close proxmity to one stretch of the housing wall that is in concentric relationship with the impeller. Stones larger than a predetermined size are screened from the manure by an arcuate grid that overlies the impeller in concentricity therewith. Thus, instead of ricocheting wildly within the housing following their separation from the manure, the stones are guided smoothly around the impeller and back out the inlet opening.

Abstract: An ore washing machine is disclosed which comprises an elongate box mounted on rollers for simultaneous rolling and rocking movement transversely of the longitudinal axis of the box. A plurality of horizontally extending, superposed screens are mounted within the box at substantially the mid-span of the side and end walls. Arcuate corners which join the side and end walls with the bottom wall are formed with radii which are sized within the range of one-fourth to one-half of the vertical distance between the lowermost screen and the bottom wall. An operating arm and yoke are connected with one side wall at the level of the lowermost screen for imparting a reciprocating thrust force to the box so that a charge of ore and water which is deposited in the box is caused to move in a figure eight path for an improved washing action. The fines passing through the screens move upwardly through a discharge spout which is oriented at an angle of 45.degree. or less with respect to a side wall.

Abstract: Screening apparatus for paper fiber stock and other fiber suspension is especially designed to handle relatively suspension containing stringy material. A perforate screen cylinder forms the outer wall of the supply chamber for the stock to be screened, and a rotor operates in the supply chamber and includes vanes which travel in spaced relation with the inner wall of the screen cylinder. These vanes are supported on the rotor hub by imperforate arms of substantial axial extent which act as propeller blades to maintain a high rate of circulation of the stock within the supply chamber and also to direct the stock toward the reject collecting chamber from which stock is continuously discharged at a high volumetric rate approaching or equal to the rate of discharge of accepted stock. Helical ribs on the inner surface of the screen cylinder aid in channeling the flow of reject-containing stock toward the reject outlet.

Abstract: A treatment chamber for purification and fractionation of materials suspensions, particularly fibrous suspensions under pressure, and wherein the treatment chamber includes a rotary screening drum provided with pulsation members, the drum also including screening holes located on the back-side of, or immediately behind, the pulsation members as viewed in the direction of drum rotation.