Abstract: A screening bucket characterized by a rear portion, and a front portion supported for pivotal displacement toward and away from the rear portion, a pair of hydraulic slave cylinders connected to the front portion for displacing it relative to the rear portion for establishing therebetween a closeable discharge opening, a deployable flexible screen for forming a perforated occlusion for the discharge opening comprising a web formed of a plurality of links defining a myriad of discharge openings through which contents of less than a selected screen size is discharged from the bucket, and a power driven reel for alternately taking-up and paying-out the web as the front portion of the bucket is displaced relative to the rear portion thereof.

Abstract: The disclosure relates to a process and a cleaning machine for seed, grain and similar goods, in which the cleaning is realized by means of air circulated in an enclosed path by at least one fan, the air passing the grain adjacent the discharge opening of the machine for the air-cleaned grain. In the machine the resistance to the air circulating in the enclosed path is adjusted such that the static O-point will be located in the vicinity of the discharge opening for the air-cleaned grain. Furthermore, for the purposes of the above-disclosed process, the fan cooperates with a duct for the cleaning air moving to the fan, and with a duct for the air recycled to the cleaning station at the discharge opening, the ducts being of roughly the same length.

Abstract: A vortex cleaner for separating a gaseous or liquid suspension, as for instance a paper pulp suspension, into fractions comprises an elongate vortex chamber which has a circular cross-section and tapers gradually, over at least part of its axial length, towards one axial end of the chamber. The larger end of the vortex chamber is provided with a tangential inlet for the suspension to be treated and an axial outlet for a lighter fraction of the treated suspension. The smaller end of the vortex chamber is provided with an axial outlet for a heavier fraction of the treated suspension. The tapering portion of the vortex chamber consists of a plurality of chamber sections, which are disposed one after the other in axial direction and are in direct communication with each other.

Abstract: A method and apparatus for treating a suspension of liquid, paper making fibers and undesirable rejects to remove a substantial portion of the rejects from the suspension. A cylindrical screen is utilized which has narrow slots on the order of 0.001 to 0.008 inch in width disposed normally with respect to the screen axis, and bars projecting from the inlet face of the screen and cooperating with rotating foils for creating a field of high intensity, fine scale turbulence adjacent the inlet face of the screen. This permits the paper making fibers to pass through the narrow screen openings but causes very small reject particles, which would pass through the larger openings of conventional paper making screens, to be removed without fractionation of the paper making stock or appreciable variation in the consistencies of the feed, accepts and rejects.

Abstract: A continuous flow of material is separated in a continuous centrifugal classifying method into at least one fraction of coarse material and at least one fraction of fine material using a deflected flow with the stream of material introduced in a thin layer into a classifying flow which is deflected in a classifying region, the classifying flow being internally adjacent a curved inner deflection wall having an inner deflection angle greater than approximately 45.degree.

Abstract: The invention relates to vibratory material handling apparatus and more particularly to a dual exciter system derive for vibrating the apparatus wherein the exciters are positioned on either side of the center of gravity of the apparatus and direct vibrations at obtuse and acute angles, respectively, through the center of gravity of the apparauts, the arrangement being much whereby the vibratory force exerted by each exciter may selectively be varied so as to cause the apparatus to vibrate vertically, or displaced from the vertical, so as to convey in one direction or the opposite direction. The arrangement is such that the spring system connecting the exciters to the material-handling apparatus acts as isolation springs when the vibration generator associated therewith is inoperative, and as tuned natural frequency systems when the vibrator is actuating.

Abstract: A wet gravity concentration apparatus with means to divide two streams into four streams of different concentration and means to combine the two streams of intermediate concentration. Two conical concentrators are arranged with a first richer stream flowing over one conical surface and a second poorer stream, flowing over the other conical surface. Each surface has a splitter to separate the stream into a concentrated substream rich in value particles and a less concentrated substream composed primarily of tailings. The richer substream of the second poorer stream is combined with the less concentrated substream of the first richer stream so there are three resulting streams. A deflector can be used to combine the two intermediate substreams.

Abstract: A vibratory feeder for conveying particulate material from one level to a higher level comprising an inclined, article-supporting surface, means for vibrating said surface, a plurality of baffles disposed in spaced apart relationship and spaced from the inclined surface with the baffles lying at an angle to the article-supporting surface.

Abstract: A riffled ore concentrating table of the reciprocating type is connected to a table support by ball bearings. The table support has one of its edges pivotably connected to one edge of a base member and the other of its edges supported by the other edge of the base member in a manner such that the elevation of one edge of the table may be adjusted with respect to the other edge of the table.

Abstract: A rotary drum-type sand classifier of this invention is provided with a desired number of rows of sand discharging mechanisms at the rear end thereof.Between each pair of sand discharging mechanism, a water cleaning chamber is formed where the classified sand is cleaned with water fed from the rear outlet of the drum. Due to the above construction, the sand classifier of this invention can conduct the classifying and cleaning of sand to be produced simultaneously and efficiently.

Abstract: A rail construction for mounting and tensioning an electrically heated screen on and between a pair of longitudinally extending, spaced frame members. The rail preferably is formed as an aluminum extrusion having a relatively large metal mass in cross section. The rail has a modified channel shape in cross section with an upper curved flange, a lower angled flange and an intervening projection. The upper curved flange is enclosed with electrical insulation and is adapted to engage a vertical wall of one of the frame members when mounted thereon. The lower angled flange has a hook shape complementary to a hook shape formed on the edge of the screen cloth. The intervening projection forms a wedge-shaped channel in combination with the lower hook-shaped flange of the rail. The wedge-shaped channel has an angled surface against which a complementary wedge-shaped clamping bar clamps the hooked screen edge.

Abstract: A method of aerating slurry involves the use of a screw conveyor operating in a tubular casing having an inlet and an outlet. The inlet has access to the air above the level of the slurry so that as the conveyor is rotated air is admitted through the inlet and discharged at the outlet, which is below the surface level, into the body of the slurry. The screw conveyor may be in two portions of opposite hand so that one portion discharges air and the other portion discharges slurry at a common outlet intermediate the two ends of the casing.

Abstract: The invention is an improved apparatus for collecting sludge off the bottom of settling tanks such as used in water treatment systems. The collector includes a carriage or bridge which travels on tracks along the tank wall. A siphon tube is suspended in the tank from the carriage and includes two or more sludge intakes spaced across one dimension of the tank proximate to the sludge layer. The tubes are connected to a common header, which in one embodiment also serves as a structural member of the bridge. The header is closed at one end and connected at the other end to an arched section of the tube which extends up and over the tank wall to a sludge discharge channel. A discharge section is supported in the sludge channel in association with the free end of the arched section, and can be adjusted to regulate the flow through the siphon pipe. Except for the arched section, all of the siphon tube and preferably part of the carriage are submerged in the water.

Abstract: A centrifuge for the dewatering of a fine grained material having a downwardly flaring frusto conically shaped porous sieve cage rotatable about its axis and axially oscillatible with a preacceleration frusto conically shaped cone within the sieve cage with its larger end upwardly and a central material delivery means for supplying material to the cone and an annular spoked mounting means extending between the base of the cone and sieve cage with a drive connecting to the mounting means and an elastic connection between the rotatable drive and sieve cage and an elastic connection between the oscillatible drive and sieve cage and an annular downwardly extending solid collection housing mounted at the lower end of the sieve cage and an annular housing surrounding the sieve cage for the collection of water with the oscillatible drive and rotatable drive mounted at the base of the unit coaxial with each other.

Abstract: The present invention is concerned with a method for washing filter-cakes and a spray nozzle intended for use with the method.The invention provides a method of washing filter-cakes transported by a rotary belt filter, the filter-cake being caused to pass along a washing station by means of a conveyor belt having longitudinally extending side ridges and being smoothed by means of a doctor, in which method washing liquid is dispersed over the filter-cake and caused to pass there through by means of a vacuum on the undersurface of the filter-cake, wherein washing liquid is supplied to the filter-cake in the form of a laminar flow across the major portion of the width of the filter-cake, said flow having a slight turbulence in a zone adjacent each side ridge.

Abstract: Dewatering solid suspensions such as gypsum semihydrate in water of varying concentrations down to a low residual moisture by flowing the suspension into a hydrocyclone to partially dewater the suspension and then to a pusher centrifuge to produce solids of low residual moisture and controlling the volume inflow to the hydrocyclone to maintain, despite variations in concentrations of solids in the feed, a constant amount of solids per unit time. Variations in power consumption of the pusher centrifuge or specific gravity of the suspension before it enters the pusher centrifuge may be used to determine changes in volume inflow to maintain a constant solids content per unit time entering the hydrocyclone. Reduction of the solids to a uniform and low residual moisture content and avoidance of operating difficulties such as clogging or inadequate separation of the water results.

Abstract: A centrifuge for continuously separating a lubricating liquid from lubrication-impregnated metal chips. A motor having a drive shaft thereon is mounted so that the drive shaft is drivingly coupled to a substantially bell-shaped centrifugal drum having an outwardly widening conical portion. The drum is formed with openings intermediate the top edge and bottom wall for discharge of the liquid therethrough. A metal chip and air inlet is provided adjacent the central portion of the outwardly opening drum. A first collecting structure is provided for collecting the liquid emanating from the lubrication-impregnated chips and for discharging the liquid from the centrifuge. A second annular collecting structure surrounds the peripheral edge of the drum radially outwardly spaced therefrom for collecting shavings discharged by centrifugal action from the drum.

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: The filtered liquid present in the rotating compartments of the core of a disc filter is suctioned out of the filter through two separate zones. Muddy or turbid filtrate is drawn out as the compartments pass through a first zone lying near the bottom point in the rotation of the compartments. Thereafter, the compartments pass through a second zone located in the region of the first 60.degree. of the upward movement of the compartments, in which zone the clear filtrate is drawn out. The compartments have a slight axial pitch and their surfaces are concave so that, as the compartment moves in the upward direction, the filtrate flows towards the discharge ports of the filter.

Abstract: A process and apparatus for separating solid granular metallurgical products. A plurality of linearly vibrating screens are housed, one over the other, each inclining more than the one above and each having a smaller mesh opening than the one above and 1.5 to 15 times larger than the desired parting size. The solids are fed onto the uppermost screen at the upper end thereof and are deflected in the direction of inclination of the screen. The finer solids initially fall through freely and on screens having smaller mesh openings and are also deflected in the direction of inclination of the screen. The coarsest solids fraction is withdrawn as overflow from the uppermost screen, finer solids fractions are withdrawn as overflow from following screens, and solids which have passed through all screens are withdrawn as a finest fraction. A gaseous fluid is flowed through at least part of the working space required for screening approximately transversely to the direction in which the solids pass through the screens.