Abstract: Static screening apparatuses that provide improved efficiency in the removal of undersized particles from oversized particles. In an embodiment, a static screening apparatus incorporates two or more (e.g., multiple) stacked screening modules allowing for adding additional screening capacity without significantly increasing space requirements for the multiple screening apparatuses. In some embodiments, a static screening apparatus utilizes specialized synthetic screening surfaces having an increased open area in relation to convention wire and wedge wire screens. The increased open area of such synthetic screen surfaces provides more efficient separation of oversized materials from undersized materials in sieve or static screen assemblies. In further embodiments, a stacked static screening apparatus may incorporate synthetic screening surfaces.

Abstract: A vibratory screening machine includes replaceable screen assemblies. Compression mechanisms are used to secure replaceable screen assemblies to the vibratory screening machine. Each compression mechanism applies a force to a replaceable screen assembly that includes both a horizontal component and a downward vertical component. Each replaceable screen assembly is typically substantially flat prior to installation on a vibratory screening machine. The force applied to a screen assembly by one or more compression mechanisms causes the screen assembly to be pushed into engagement with underlying concave support members such that the screen assembly itself assumes a concave shape with the center of the screen assembly being lower than the side edges. The vertical downward component of the force helps to secure the screen assembly to the screening machine.

Abstract: A vibratory screening machine includes replaceable screen assemblies. Compression mechanisms are used to secure replaceable screen assemblies to the vibratory screening machine. Each compression mechanism applies a force to a replaceable screen assembly that includes both a horizontal component and a downward vertical component. Each replaceable screen assembly is typically substantially flat prior to installation on a vibratory screening machine. The force applied to a screen assembly by one or more compression mechanisms causes the screen assembly to be pushed into engagement with underlying concave support members such that the screen assembly itself assumes a concave shape with the center of the screen assembly being lower than the side edges. The vertical downward component of the force helps to secure the screen assembly to the screening machine.

Abstract: A step-down spring seat assembly secured to a vibratory screen machine is configured to receive one or more universal adapter plate assemblies, to which one or more compression springs is secured. The universal adapter plate assemblies are secured to a top surface of the step-down spring seat assembly, and one or more spring guide castings are connected to the one or more universal adapter plate assemblies. Compression springs are positioned atop the spring guide castings, and are secured to a top adapter plate assembly that is connected to one or more universal adapter plate assemblies positioned above the one or more compression springs.

Abstract: A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, first members extending between the side edge portions and the second members extending between the lower edge portion and the upper edge portion, third members substantially parallel and extending transversely between the side edge portions and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, reinforcement members molded integrally with the third and fourth members.

Abstract: A gold panning assembly for vibrationally separating gold from dirt includes a pan that may receive a mixture of the dirt and the gold. A vibration unit is coupled to the pan. The vibration unit vibrates the pan such that the vibration unit urges the gold to separate from the dirt thereby facilitating the gold to be removed from the dirt.

Abstract: A pedal articulated screen shaker assembly supporting a classifying screen at its top in an alignment over a collection receptacle is provided with an annular nested dust shielding combination suspended below the screen. The dust shielding combination comprises a conforming set of frustoconical elastomeric membrane segments in a nested arrangement with the exterior one of the segments perforated throughout its full circumference by perforations that are bridged by flexible flaps formed in the overlying interior segment that are lifted from their bridging alignment by the lateral movement imparted to the shielding combination.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A shaker screen for attachment to a bed of a shaker includes a screen frame having at least one mesh screen attached to the top side of the screen frame, wherein the screen frame is preferentially bowed prior to attaching the mesh screen to the screen frame.

Abstract: Screening members, screening assemblies, methods for fabricating screening members and assemblies and methods for screening materials are provided for vibratory screening machines that incorporate the use of injection molded materials. Use of injection molded screen elements provide, inter alia, for: varying screening surface configurations; fast and relatively simple screen assembly fabrication; and a combination of outstanding screen assembly mechanical and electrical properties, including toughness, wear and chemical resistance. Embodiments of the present invention use a thermoplastic injection molded material.

Abstract: A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, first members extending between the side edge portions and the second members extending between the lower edge portion and the upper edge portion, third members substantially parallel and extending transversely between the side edge portions and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, reinforcement members molded integrally with the third and fourth members.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: A screen for sifting particles of a material being processed. The screen includes a portion having an apertured matrix. The matrix is defined by intersecting, generally elastic material segments. A frame extends around at least a portion of a periphery of the matrix. The frame can mount hooks for attaching the sifting screen to a shaker bed which vibrates the matrix. The elasticity of the matrix renders the matrix flexible and stretchable so that the screen portion of the sifting screen can be attached to a shaker bed.

Abstract: A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: An elastic sieving method and corresponding large-sized elastic vibration screen. The present invention utilizes a screening surface and a separate sieving machine. A screen mat located on the sieve box is connected to multiple small rectangular screens. While the machine is vibrating, the resonation of screen rods located on the screen mat connected by small rectangular screens are initiated to screen the material and to cause the vibration of the whole vibration screen and realize the conveyance and lamination of materials. Because the screening surface is in a state of resonance, the vibration strength is strong enough to prevent the screen meshes from becoming plugged, allowing for high sieving efficiency. A bearing in the sieving mechanism is installed with a vibration damping ring, placing the bearing in a resonant state, allowing for a low dynamic stress level, which satisfies the process requirement for large-sized vibration screen excitation units with a screening surface as wide as 4800 mm.

Abstract: A screening machine includes wall members, a screen assembly, and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

Abstract: In a coal preparation plant which receives a raw coal feed and separates the raw coal feed into clean coal feed and refuse feed slurries using a media based separation process, an apparatus is provided for use therein. The inventive apparatus simultaneously processes the raw coal feed and clean coal feed and refuse feed slurries, while occupying minimal floor space within the coal preparation plant. The inventive apparatus includes a unitary vibrating screen assembly having a length and a width, wherein the width of the vibrating screen assembly is partitioned into three screen sections extending the length of the vibrating screen assembly. A deslime screen section receives the raw coal feed and separates the raw coal feed into coarse and fine sized fractions as the raw coal feed moves along the length of the deslime screen section. A refuse screen section receives the refuse feed slurry and removes separation media therefrom as the refuse feed slurry moves along the length of the refuse screen section.

Abstract: A sieving device having a mesh screen detachable from a frame body is capable of easily removing particulate material remained on the mesh screen and cleaning of the mesh screen and being installed even in a confined space requiring a sanitary condition. The particulate material sieved through the mesh screen is prevented from getting out of a collecting container or scattering around. With a vibration generating means in the sieving device, sieving vibration can be efficiently produced with a relatively small power with preventing coagulation and agglomeration of the particulate material. By corrugating the bottom of the mesh screen, the efficiency of sieving the particulate material be increased remarkably.

Abstract: A new and unique design use of directional and re-directional raised ribs on a solids control filtering screen, such as those used in drilling wells for hydrocarbons and other substances, in conjunction with a coordinated system of hanging such screens and directing and redirecting the flow of trapped solids over the surface of such screens, is disclosed for use with a vibratory shaker. The invention counteracts the natural tendency of trapped solids to migrate to and congregate in the lowest areas of a suspended screen and facilitates a dryer fluids discharge, as well as more effectively utilizing the available screening surface area, and therefore the invention reduces the incidence of screen wear and tearing and increases the flow rate conductants and drying capabilities through the screen.

Abstract: A vibratory separator for separating components of material introduced to the vibratory separator, the vibratory separator including a basket for holding screening apparatus, the basket having two sides spaced-apart by a first end at which the material is introduced into the basket and a second end spaced-apart from the first end, certain components separated from the material exiting the basket from the second end, vibrating apparatus connected to the basket for vibrating the basket, screening apparatus mounted in the basket, the screening apparatus having at least a first portion and a second portion, the first portion lower in the basket than the second portion, and receptacle apparatus below the screening apparatus for receiving material components flowing through the screening apparatus.

Abstract: A screen assembly for a conventional vibratory screening machine includes an upper fine mesh screen which passes particles below a predetermined size and rejects particles above this size. A second or blinding screen, below the first screen, acts to dislodge particles caught in the mesh of the first screen. A load bearing assembly supports the first and second screens and includes a first support screen coarser than the screens above it, a perforate plastic mesh and a second support screen coarser than the first support screen. The assembly is placed in a heated press which softens the plastic and then bonds the screens together. In a second embodiment of the invention, an undulating screen assembly is bonded to a support which comprises one or more screens of coarser mesh.

Abstract: A sieve screen deck comprising having a frame and a sieve screen resiliently mounted to the frame so as to allow a limited amount of movement between the sieve screen and the frame. The sieve screen has flexible side walls. The screen deck also has a rapping mechanism which itself has a ram fixed at one end relative to the frame and acting at its other end on a drive shaft via a crank arm. The drive shaft extends across the sieve screen and is rotatably journalled in the respective side walls of the sieve screen. The rapping mechanism also has a rapping bar connected to the drive shaft by resilient elongate arms. The rams is actuated so as to move the rapping bar at intervals from a rest position wherein the rapping bar is spaced a short distance from the sieve screen and the sieve screen is supported by the frame to a primed position.

Abstract: A process for the recovery of coal particles having a maximum dimension of less than 2 mm from coal tailings including the steps of forming a slurry (101) of tailings having a pulp density of from 10 to 30% by weight; feeding the slurry into a hydrocyclone (103) to produce an underflow second stream which contains the tailing particles over a predetermined size and some of the gangue particles smaller than that size and an overflow stream containing the coal particles smaller than the predetermined size and the balance of the gangue particles, the hydrocyclone (103) being operated such that the underflow stream has a pulp density of from 40% to 60% by weight; adjusting the pulp density of the second stream, if required, to from 20 to 50% by weight; passing the repulped second stream over a rapped or vibrated sieve screen deck (105) having a wedge wire sieve screen with a radius of less than 2 m, an arc angle of from 45.degree. to 60.degree.

Abstract: A vibratory screening device for dressing, sizing, desliming, and dewatering feed streams of fine particulate material is comprised of a vibratory sieve bend screen and a vibratory planar screen deck. The sieve bend screen is positioned at the feed end of the planar screen deck and is arranged so that linear vibratory motion acting on the sieve bend screen is substantially tangential to the arcuate midsection of the sieve bend. Advantageously, the two units can be mounted on a single frame so that only a single vibratory drive is required for imparting linear vibratory motion to both the sieve bend and the planar screen deck. The linear vibratory motion is preferably at an angle of about 40.degree. to the main planar deck and imparts a counter-current force to the fine particulate material flowing across the mid-section of the sieve bend.

Abstract: A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, a plurality of major and minor substantially parallel ribs extending between the upper and lower edge portions and substantially parallel to the side edge portions, dividing strips extending between the major and minor ribs to define screen openings therebetween, aramid fibers extending between the side edge portions and through the dividing strips to provide tensile strength to the dividing strips, and upper triangular cross section portions formed integrally with the major and minor ribs and extending above the upper surface of the screen to direct foreign matter laterally toward the screen openings.

Abstract: There is disclosed herein a beach trash remover which includes a motorized vehicle having a conventional construction type shovel attached to the front thereof. An opening covered by a screen is provided in the center of shovel to allow the beach sand, containing the trash, to drop back onto the beach thereby leaving the trash within the screened opening portion of the shovel. The screen is held on a frame which is coupled to the shovel through shock absorbers and means are provided to provide a vibrating motion to the screened frame to further aid in returning the sand to the beach. A grader may be attached to the back end of the beach trash remover to cover any tire tracks or otherwise smooth the beach.

Abstract: Separating equipment having a partially submerged vibratory screen in a screening device wherein oversized particles are induced to flow in a spiral direction outwardly from a central submerged area of the screen. A low velocity inlet manifold is employed centrally above the screen and a spray mechanism directs clearing spray to a peripheral area outwardly of the submerged portion of the screen. The screen is submerged by means of a chamber which extends outwardly above the lower most portion of the concaved partially submerged screen. The preferred embodiments specifically contemplates the screening of water borne wood pulp for the paper industry.

Abstract: A novel vibratory screening apparatus particularly adapted for the wet-screening of slurry mixtures containing particles and liquids, and more particularly to the separation of solid particles and liquids utilizes in combination a combined vibratory screening deck having a sieve bend portion upstream of an inclined substantially planar portion to effect substantial dewatering of the slurry mixture as it flows across the screening deck.

Abstract: A sieve screen deck, the screen of which comprises a plurality of horizontal wedge wires connected to an array of backing bars running longitudinally of the screen parallel to its fall line. The screen is connected to a frame at its two ends, at least one end being connected by resilient means such that the screen may vibrate and flex under the influence of rapping or vibrating means. Side walls are provided along sides of the sieve screen, to prevent material flowing over sides of the screen, are also formed of a resilient material in order that they do not substantially impede the ability of the sieve screen to vibrate and flex under the influence of the rapping or vibrating means.

Abstract: Disclosed herein is a device to aid in the preparation of foodstuffs that combines the functions of a breader, a marinator and a preparation unit in a single apparatus. This device is comprised of a tiltable mixing head supported by a mobile service cart disposed with a variety of catch basins depending upon the function being performed by the device.

Abstract: A material separating device (10) includes a frame member (13) which carries a plurality of vertically arranged support members (19-23). Each of the support members (19-23) includes a plurality of support rods (19A-D, 20A-D, 21A-D, 22A-D, 23A-D). Screen elements (24-28) are stretched by adjustable tensioning devices (30) over each of the support members (19-23) to form screen panels (24a-e, 25a-e, 26a-e, 27a-e, 28a-e) between the support rods (19A-D, 20A-D, 21A-D, 22A-D, 23A-D). Each successive screen panel (24a-e, 25a-e, 26a-e, 27a-e, 28a-e) is inclined at a greater angle than the preceding screen panel (24a-e, 25a-e, 26a-e, 27a-e, 28a-e) so that material being separated moves progressively faster as it traverses each screen element (24-28).

Abstract: A screening machine in which screens or portions of screens of elastic material and having substantially the shape of conical frustums are arranged one below the other. The circular edges of the screens are supported by holders which are mounted to a rotating shaft by means of bearings. The bearings of alternate holders being mounted on eccentric crank pins to drive such holders, without their rotating, in a substantially circular horizontal oscillatory motion to impart to each screen a rapid vibratory motion in which every section thereof participates. The vibratory motion results from a portion moving into and out of tension in conjunction with the rotation of eccentric crank pins.

Abstract: The device for wet classification of a mixture of solid components with rect to size, according to the invention, has two circular chutes "2" and "2a" situated tangently next to each other at the same level and equipped with one common feeding nozzle "3". In the outer walls of the chutes "2" and "2a" in the region of their contact there is a distributing hole "5" in which, opposite the inlet of the feeding nozzle "3", there is the dividing wedge "6". The device has separate sieve planes "1" and "1a" fastened to the inner edges of the bottoms of the circular chutes "2" and "2a". A vibratory unit "7" is located on the central vertical axis of each sieve plane.

Abstract: An apparatus for sorting wood chips or other particulate material into groups according to size. The apparatus includes a housing having an opened top, a first screen attached to the housing substantially covering the opened top thereof, a second screen attached to the housing beneath the first screen, and a hopper fixedly attached to the housing for holding a quantity of wood chips and for depositing wood chips onto substantially the center of the first screen. The first and second screens slope downwardly from the centers thereof so that any wood chips of a size too large to pass therethrough will pass, aided by the force of gravity, to the periphery thereof.

Abstract: A power driven oscillating sifter oscillated by a motor driven crank arm with the sifter having a pair of end plates and a central baffle all secured to the shaft. A perforated semi-cylindrical sifter panel is detachably secured to the end panels by means of inturned flanges on the end panels. The sifter panel has a plurality of longitudinally extending ribs for agitating the material to be sifted and openings are provided in the baffle and the lower end wall to permit the exit of materials which will not pass through the perforations of the sifter panel.

Abstract: A vibratory screening apparatus has a pair of screen cloths in close face to face abutment with the wires of the lower screen cloth generally intersecting the openings of the upper screen cloth to prevent "blinding" of the upper screen cloth by reason of the tendency of the wires of the lower screen cloth to prevent engagement of particles in the upper screen cloth of a size which would tend to clog the openings of the upper screen cloth. The mesh size of the lower screen cloth may be equal to the mesh size of the upper screen cloth or slightly larger than the upper screen cloth openings up to about 50 per cent larger. The superposed screen cloths may rest upon a much coarser mesh screen which serves merely as a structural support for the screen cloths and does not perform a screening function.