Abstract: A vibrating screen device includes a support structure, which supports apertured screening elements. The support structure includes a plurality of support carriers, each having a straight portion and a spacer part fixed to at least one end of the straight portion. The spacer part of each support carrier engages a spacer part of an adjacent support carrier to space the straight portions apart by a predetermined distance.

Abstract: A screen panel assembly is used with a screening machine. The screen panel assembly includes first and second generally planar screen panels and a coupling between the first and second screen panels that includes a compression clip jaw to temporarily secure the screen panels together. An overlap region between the first and second screen panels permits lifting of the second screen panel by a lifting force exerted upon the first screen panel while inhibiting the passage of material being screened between the two adjacent screen panels.

Abstract: A method of forming a shaker screen includes forming a frame, and attaching a first sealing element to at least one side of an outer perimeter of the frame, wherein the attaching comprises aligning a first mating surface of the frame to a second mating surface of the first sealing element, and wherein the first mating surface of the frame includes an extension, and the second mating surface of the first sealing element includes a groove configured to align with the extension. A system of sealing shaker screens includes a first screen and a second screen disposed adjacent the first screen, wherein a first sealing element of a first frame and a portion of the second screen interact to provide a seal between the first screen and the second screen.

Abstract: A screen element (2) of a screen (1) has longitudinal sides adapted to be arranged in a longitudinal direction of a screen frame (4) and transverse sides adapted to be arranged in a transverse direction of the screen frame (4). The transverse sides of the screen element (2) are provided with at least one projection (6) and/or at least one recess (7) for locking engagement, in a direction transversely to the plane of the screen element (2), with a corresponding projection (6) and/or recess (7) on neighboring screen elements arranged in the screen frame (4). A screen (1) with a screen element (2) arranged in a screen frame (4) is also disclosed.

Abstract: A screen deck assembly has an elongated connecting member for securing screen panels to a vibratory machine. The connecting member has a first end and a second end, a body, a transverse arm contiguous with and generally perpendicular to the body, and a radial dome top extending above the transverse arm such that a locking channel is formed between the transverse arm and the radial dome top. A screen, which has a locking profile that corresponds to the locking channel in the connecting member, is detachably secured to the connecting member by sliding or pressing the locking profile into the locking channel.

Abstract: A vibratory screening machine includes a primary screening area and a pre-screening assembly including a frame and screen assemblies. The screen assemblies are secured to the frame and form a pre-screening surface. The frame is attached to the vibratory screening machine such that the concave pre-screening surface is above the primary screening area.

Abstract: A clip rail comprises an elongated body having a first end and a second end. The elongated body defines an upper recess configured to engage with one or more screen panels, the elongated body further defines a lower recess configured to engage a support member of a screening apparatus. Each of the first end and second end includes a two-platform structure, the two-platform structure configured to engage with another two-platform structure, wherein the first platform is offset from the second platform. Further, the first platform is adjacent to the second platform, and the second platform is laterally and vertically offset from the first platform, and the first platform is in a first plane and the second platform is in a second plane.

Abstract: A vibrating screen device for fractionizing stones and gravel includes a support structure, a plurality of carriers mounted on the support structure, and a plurality of screening mats removably mounted on the carriers in side-by-side relationship. Each carrier includes two upright beams forming a slot therebetween. Each screening mat has opposite end parts, wherein respective end parts of two adjacent screening mats are received in each slot. The beams and end parts include protrusions and grooves which are interconnected, and maintained in connection, by a wedge inserted into the slot between the end parts.

Abstract: A shaker apparatus including a basket having an upstream side, a downstream side, and two side walls, at least one wedge guide and one support rail disposed on each side wall, and at least one screen assembly. The support rails and the wedge guides may be configured to engage the screen assembly. The screen assembly may have one or more layers of screen mesh mounted on a screen frame. The screen frame may include a first and a second side rail, each having an upstream end, a downstream end, a top surface, and a bottom surface. A slope of the top surfaces intermediate the upstream end and the downstream end may be different than a slope of the bottom surfaces intermediate the upstream end and the downstream end.

Abstract: A shaker screen including a composite frame, a removable grid attached to the composite frame, and at least one filtering element attached to the removable grid is disclosed. A method including forming a composite frame, forming a removable grid, attaching at least one filtering element to the removable grid, and attaching the removable grid to the composite frame is disclosed. Additionally, a method for rebuilding a shaker screen, the method including removing a first screen assembly from a composite frame, the screen assembly having a removable grid and at least one filtering element, and attaching a second screen assembly to the composite frame is disclosed.

Abstract: A filter screen to be used in conjunction with a shale shaker in removing solid matter from drilling fluids includes a filter plate having a plurality of perforations, a plurality of hold-down apertures, and a pair of end caps attached to the filter plate, wherein each end cap is configured to isolate the hold down apertures from the plurality of perforations.

Abstract: A screen panel center retainer system for a vibrating separatory machine utilizes a center retainer that is provided with a retainer base which is adapted to be secured to screen stringer rails of a vibrating separatory machine. A pair of retainer channel legs form an upper portion of the center retainer and have screen panel edge receiving slots. A locking strip, having a wedging tongue, is used in conjunction with the center retainer. The wedging tongue is insertable into the channel on the center retainer which is defined by the two retainer channel legs. Flow control dams and cross dam retainers are used in conjunction with, and in addition to the center retainers and locking strips. The cross dam retainers are provided with locking strip end receiving pockets, to compensate for changes in the length of the locking strips. The screen panel center retainer system is configured to provide a functional, universal installation of screen panels on vibrating separating machines.

Abstract: A screening apparatus includes beams and screen panels forming a broad screening surface. Each panel is mounted to a pair of beams along opposite side edges to bridge between two adjacent beams. The panels are mounted to an upwardly facing edge of the beams by elongate fixing members extending in the longitudinal direction of the beams. The fixing members engage opposite side edges of the panels and include a pair of projections that extend into openings provided in the edge of the beams. Each projection is engaged by a locking clip to prevent release from the openings. The openings into which the projections extend are of greater diameter than the outside diameter of the projections providing a loose fit within the openings, to allow movement of the fixing rails and the screen panels before the projections are engaged by a locking clip.

Abstract: A screening module for a screening assembly includes a panel member defining a plurality of screening apertures; and a support arrangement with which the panel member is fast. The support arrangement includes a plurality of strengthening arrays arranged, in use, beneath the panel member, each strengthening array comprising a skirt portion bounding an area on a bottom surface of the panel member.

Abstract: The invention relates to a method and a device (01) for dewatering and drying a mixture made of plastic granulate and water, having at least one mixture intake (02), through which the mixture is supplied to the device (01), having at least one water outlet (08), through which the precipitated water is removed from the device (01), having at least one granulate outlet (13), through which the dried granulate is removed from the device (01), the device (01) having a dewatering line (06), along which the mixture is dewatered, and the device (01) having a drying line (12), along which the dewatered granulate is dried.

Abstract: A sifting implement for use with a container, such as a wheelbarrow or bucket. The sifting implement includes a frame having an opening through which compost, dirt, rocks, sand, or other material is sifted. A primary screen is supported in the opening to catch larger items in the material being sifted. Other screens are used for separating different size materials. A bracket is attached to the implement and engages an edge of the container, which allows the implement to be tilted in order to dump the larger items. The sifting implement also includes a containment border disposed around the opening to direct the separated items toward the front of the implement when the implement is tilted to dump the items.

Abstract: A perforated plate for a vibratory sifter, the perforated plate including a base plate comprising a plurality of openings formed therethrough, and a flange integrally formed with the base plate. A method of forming a screen assembly for a vibratory sifter, the method including forming a base plate, forming a plurality of openings extending from a top surface to a bottom surface of the base plate, and forming an integral flange on the base plate.

Abstract: A screen retainer having adjustable tensioning includes a bushing and a tensioning device. The bushing has a center and a thickness that varies radially about the center. The tensioning device includes a surface adapted to receive the bushing, a spring, an engagement member, and at least one screen contact surface. The engagement member is coupled to the tensioning device and is adapted to engage the bushing. The engagement member can be eccentric with respect to the center of the bushing in an installed configuration. The at least one screen contact surface is adapted to engage and place a compressive force on the screen when the spring is placed in compression by an exertion of force by the engagement member on the bushing. The compressive force placed on the screen can be varied based at least in part on a rotation of the bushing on the surface.

Abstract: A supporting structure for different screening media on a vibrating screen is disclosed, as well as a support carrier of the supporting structure. The supporting structure is received on a vibrating screen and has a number of support carriers arranged parallel to each other and perpendicular to a number of transversal carriers. The support carriers and the transversal carriers form a grid. The support carriers have grooves at each end to be snapped on and locked on circular ribs on top of the transversal carriers. The support carriers are made of a polymeric material and are elongated elements.

Abstract: A screen panel retainer assembly, that is utilizable with a vibrating separatory machine, is configured with a plurality of discrete, mushroom-shaped screen panel retainers. Each such retainer has a retainer head that is generally in the shape of a portion of a cylinder, such as a right cylinder. A shank connects each such retainer head to a suitable retainer bar. The retainer bar can be adapted to be attached either to screen stringer tubes of the vibrating separatory machine, or to underlying cross tubes and end cross tubes. The screen panels, which are to be secured to the vibrating separatory machine, have complementary shaped mushroom-shaped screen panel retainer head receiving chambers in their side surfaces. Two such panel edges define a whole chamber. The retainer heads are metal whereas the screen panel edges are resilient. The mushroom-shaped heads securely snap into their complementary chambers yet can be removed from those chambers when the screen panels have to be replaced.

Abstract: A screen panel retainer assembly, that is utilizable with a vibrating separatory machine, is configured with a plurality of discrete, mushroom-shaped screen panel retainers. Each such retainer has a retainer head that is generally in the shape of a portion of a cylinder, such as a right cylinder. A shank connects each such retainer head to a suitable retainer bar. The retainer bar can be adapted to be attached either to screen stringer tubes of the vibrating separatory machine, or to underlying cross tubes and end cross tubes. The screen panels, which are to be secured to the vibrating separatory machine, have complementary shaped mushroom-shaped screen panel retainer head receiving chambers in their side surfaces. Two such panel edges define a whole chamber. The retainer heads are metal whereas the screen panel edges are resilient. The mushroom-shaped heads securely snap into their complementary chambers yet can be removed from those chambers when the screen panels have to be replaced.

Abstract: A screening machine of the type used to separate or classify mixtures of solid particles of different sizes includes a machine frame and a perforate screen panel mounted for movement relative to the machine frame during a screening operation. The screen panels are pre-tensioned mesh screen material mounted in a peripheral rim for separating various granular and particulate materials. The screen panel is slid into the side of the machine frame in a direction orthogonal to the direction particulate matter moves when the screening machine is operating. The screen panel peripheral rim has a shaped or other cross section adapted to hold a large seal member that provides a positive sealing surface for contact with the machine frame to prevent particulate matter from escaping off of the screen panel during use.

Abstract: Apparatus is provided, in or for a screen separator for sieving materials, for clamping one or more sieve screen frames 78 within the confines of a chassis 40 of the separator to prevent egress of material from the separator. The apparatus comprises a sheath 50 extending around and embracing the chassis 40 and one or more expandable elements 66 for urging the sheath 50 against the chassis 40 and the screen frame(s) 78 to impart uniform clamping pressure to the clamped elements. The sheath 50 is designed to provide ease of mounting and release.

Abstract: An adapter system for fixing different screening media to a vibrating screen. By way of the adapter system, different side hold downs used for different screening media may be fixed to a wall of the vibrating screen without any modifications of the wall. The adapter system includes an insert to be placed in an opening of the wall. An adapter is attached to the insert at a desired height in relation to the insert. The insert has a number of parallel grooves co-operating with parallel ribs on the adapter in order to attach the adapter to the insert.

Abstract: Disclosed herein is a structure for fixing screen bars of a screening apparatus, which is installed in a wastewater treatment plant to remove impurities contained in wastewater and includes a screen panel formed by arranging the screen bars parallel to each other to have gaps ranging from 1 mm to 10 mm therebetween. The screen bar fixing structure of the present invention is constructed such that screen bars, which are thin and long shapes, can maintain the straightness and gaps therebetween constant even though the screen bars are not welded to support bars provided on the rear surfaces of the screen bars, thus solving the problem in which impurities such as hairs, which are relatively long, are wound around the support bars, with the result that rakes undesirably flip or are damaged, or the gaps between the screen bars become clogged.

Abstract: A vibratory screening apparatus includes a screen module. The screen module includes: a panel frame having opposed side portions joined by opposed end portions, the end portions configured to locate the panel frame between spaced panel support rails; at least one intermediate portion extending between the opposed side portions and/or opposed end portions and dividing the panel frame into panel portions; the side portions and the at least one intermediate portion having engagement formations provided on upper surfaces thereof; and at least one pair of screen panels, the screen panels overlying respective panel portions of the panel frame and including complementary engagement formations on an underside periphery thereof for engagement with the peripheral panel engagement formations, defined by the engagement formations of the panel frame and panel support rails.

Abstract: The invention provides a screen module for use on vibratory screening apparatus.

Abstract: A screening module retaining assembly 10 includes a body member 12 defining a passage 14. The body member 12 further includes a locating formation 16, associated with a first end 18 of the body member 12, for engaging a screening module to assist in retaining the screening module relative to a screen deck A retaining element 20 is displaceably arranged in the passage 14, the retaining element 20 being displaceable between a first, non-retaining position in which the retaining element 20 is accessible from the first end of the body member 12 and a second, retaining position in which the retaining element 20 is received within the passage 14 and acts on at least a part of the body member 12 for retaining the body member 12 in position relative to a component of the screen deck. A head portion 22 of the retaining element 20 defines a receiving formation 40 for receiving a complementary formation of the screening module to assist in laterally retaining the screening module relative to the screen deck.

Abstract: A screening module 10 comprises a frame component 12 to be secured to an underlying screen deck, in use. A screening panel 14 is carried by the frame component 12. The screening panel 14 comprises an operatively upper screening surface 16 and a support structure 18 underlying the screening surface 16 with a plurality of spaced protrusions 20 being supported by and standing proud of the support structure 18. Operatively upper ends of the protrusions 20 lie substantially in a plane of the screening surface 16 and the protrusions 20 define a plurality of screening apertures 22 in the screening surface 16.

Abstract: A screen for a gyratory sifter including a frame having a plurality of cross-members and a rigid external extension. Additionally, the screen including a filtering element securably attached to the frame. Also, a method for installing a pre-tensioned screen in a gyratory sifter including inserting the pre-tensioned screen into the gyratory sifter. The pre-tensioned screen including a frame having a plurality of cross-members and a rigid external extension and a filtering element securably attached to the frame. Additionally, the method including mating the pre-tensioned screen to a ball box, wherein the mating includes placing the pre-tensioned screen against a contoured section of the ball box, and securing the pre-tensioned screen with a screen plate.

Abstract: A protective element for a cross member or shaft housing of a frame in a screening arrangement. The protective element is attachable to the cross member or shaft housing by wrapping the protective element around the cross member or shaft housing and clamping a first portion of the protective element to a second portion of the protective element by at least one clamping device. The protective element has an outwards facing surface, which is wear-resistant to withstand wear from piece goods or particle goods impinging or sliding on the outwards facing surface.

Abstract: The invention concerns screen panels of the kind used in vibratory screening operations. According to the invention, the screen panels (10) include recycled polyurethane, typically that recovered from worn screen panels. In one particular embodiment in which the panel has an upper, perforated screening section (16.1) for performing a screening action and an operatively lower section (16.2) beneath the screening section, the upper section is of molded, virgin polyurethane and the lower section comprises a reinforcing frame (12) and recycled polyurethane molded about the reinforcing frame. The invention envisages the use of blends of virgin and recycled polyurethane as well as method of manufacturing screen panels and methods of handling worn screen panels.

Abstract: A securing device for securing a screening panel to a support frame of a vibrating screen assembly. The securing device has a body with a securing means at one end and a stub at the lower end. The securing means is shaped to mate with a complementary securing cavity in the screening panel and has a hole that receives a pin located in the securing cavity. The stub may be threaded to engage the support frame.

Abstract: A magnetic clamping system for a shale shaker including at least one screen having at least two side ends extending between a first side and a second side and at least one attachment surface. The system further includes at least one mating surface of the shale shaker configured to receive the at least one screen, and at least one magnet disposed between the at least one screen and the shale shaker, wherein the at least one magnet is configured to magnetically couple the at least one screen directly to the shale shaker. Additionally, the system includes at least one decoupling apparatus, the decoupling apparatus having a handle disposed proximate a perimeter of a shale shaker, and at least one shaft that extends horizontally between the handle and one of the at least one magnet, wherein the handle is rotatable to reverse the polarity of the magnet.

Abstract: A screening module (10) for a screening assembly includes a panel member (12) defining a plurality of screening apertures; and a support arrangement (16) with which the panel member (12) is fast. The support arrangement (16) includes a plurality of strengthening arrays (22) arranged, in use, beneath the panel member (12), each strengthening array (22) comprising a skirt portion (24) bounding an area on a bottom surface of the panel member (12).

Abstract: A screening panel 10 comprises a peripheral frame 12 consisting of a pair of mutually laterally spaced side members 14, 16, which are integral with a pair of mutually axially spaced end members 18, 20. The side members 14, 16 and end members 18, 20 define corners of the panel 22.1, 22.2, 22.3 and 22.4 and the peripheral frame 12 where they meet. A plurality of mutually spaced ribs 15 extend across the periphery of the panel 10 to define a screening surface. The side members and end members are rectangular in cross-section, thereby defining substantially flat upper peripheral surfaces 12.1, outer peripheral surface 12.2 and lower peripheral surface 12.3 of the peripheral frame 12 and thus also the panel 10. The panel 10 includes locating recesses 24 provided at or near to the corners 22.1, 22.2, 22.3 and 22.4 of the panel 10. The panel 10 also has separate securing recesses in the form of semi-circular grooves 30 formed in the lower surface 12.

Abstract: The invention provides a fastener (10) for a screen panel (20), the fastener including a base section (12) at least two outer engagement means (14) extending from opposite side zones of the base section, the two outer engagement means at least partially opposing one another; and at least one inner engagement means (16) located between the outer engagement means; the inner and outer engagement means including retaining formations (14.2, 16.2) adapted to engage a complementary receiving formation in a screen panel (20) in a snap fit configuration.

Abstract: This invention relates to a method for easy installation and removal of a screen assembly for vibratory machinery and more particularly to shake table screening. The screen assembly comprises a screen frame, a screen cloth and a screen bed, whereby no clamping components are visible on top of the screen. Each assembly section can be controlled independently and clamping force is controlled by a pneumatic regulator located near an air line connection on the side of a shaker.

Abstract: The present invention relates to an apparatus and method for the easy installation or removal of screen elements from a shaker table without the use of tools. Pneumatic cylinders are used to move hold down bars up and down to either allow for screen elements to be installed or removed from the screen bed section assembly, or to clamp them into the screen bed section assembly of a shaker so that the screen elements will not move during shaker operations.

Abstract: A hookstrip screen assembly for use in a shaker is disclosed. The hookstrip screen assembly includes a filtering element and a composite frame further including a top surface, a bottom surface, and a plurality of filtering element attachment points. Also, the filtering element is attached to the plurality of filtering element attachment points. In another aspect, a method of forming a hookstrip screen assembly for use in a shaker. The method of forming a hookstrip screen assembly includes forming a wire structure, molding a composite frame incorporating the wire structure and forming a plurality of filtering element attachment points on the composite frame. The method also includes attaching a filtering element to the plurality of filtering element attachment points on the composite frame.

Abstract: A filter screen to be used in conjunction with a shale shaker in removing solid matter from drilling fluids includes a filter plate having a plurality of perforations, a plurality of hold-down apertures, and a pair of end caps attached to the filter plate, wherein each end cap is configured to isolate the hold down apertures from the plurality of perforations.

Abstract: The present invention relates to fastening means for fastening a screen plate onto a screen carrier of a screen device for a comminuting device, comprising a first tensioning element, which is connected to the screen device, particularly to the screen carrier, and which is designed to exert a force on the screen plate; a second tensioning element, which is connected to the screen device, particularly the screen carrier, and which is designed to exert a force on the screen plate, wherein at least one of the tensioning elements is an elastic element, which is designed to exert an elastic restoring force on the screen plate such that the screen plate is tensioned between the first and the second tensioning elements. The invention further relates to a method for fastening a screen plate onto a screen carrier of a screen device for a comminuting device.

Abstract: A screen panel center retainer system for a vibrating separatory machine utilizes a center retainer that is provided with a retainer base which is adapted to be secured to screen stringer rails of a vibrating separatory machine. A pair of retainer channel legs form an upper portion of the center retainer and have screen panel edge receiving slots. A locking strip, having a wedging tongue, is used in conjunction with the center retainer. The wedging tongue is insertable into the channel on the center retainer which is defined by the two retainer channel legs. Flow control dams and cross dam retainers are used in conjunction with, and in addition to the center retainers and locking strips. The cross dam retainers are provided with locking strip end receiving pockets, to compensate for changes in the length of the locking strips. The screen panel center retainer system is configured to provide a functional, universal installation of screen panels on vibrating separating machines.

Abstract: A screening apparatus for processing excavated material from a ditch into fines and roughs is disclosed. The screening apparatus includes an inclined lift conveyor for moving the excavated material upward and depositing the excavated material onto a convex vibrating screen surface. A transfer conveyor having an arcuate belt path as disposed below the separator for introducing the fines to the excavation. The separator includes a reversible motor for providing a first vibration and a second vibration to the separator.

Abstract: A method of forming a shaker screen includes forming a frame, and attaching a first sealing element to at least one side of an outer perimeter of the frame, wherein the attaching comprises aligning a first mating surface of the frame to a second mating surface of the first sealing element, and wherein the first mating surface of the frame includes an extension, and the second mating surface of the first sealing element includes a groove configured to align with the extension. A system of sealing shaker screens includes a first screen and a second screen disposed adjacent the first screen, wherein a first sealing element of a first frame and a portion of the second screen interact to provide a seal between the first screen and the second screen.

Abstract: A screening arrangement and a modular system and modular protective cover for protecting a support frame in a screening arrangement is disclosed. The modular system includes a plurality of modular protective covers mounted in side-by-side relationship. Each of the modular protective covers includes a top surface and two opposing side walls that define a recess. The modular protective cover has a male component located at a first end of the modular protective cover and a female component located at a second end of the modular protective cover. The male component of the modular protective cover is adapted to mate with the female component of an adjacent modular protective cover to provide a generally continuous protective surface along a length of a support frame.

Abstract: A vibratory plate screen having a first end for quickly mounting in a vibrator housing, an intermediate region with openings therein and a securement end that allows one to quickly secure a vibratory plate screen in a vibratory housing. In addition, the screen is sufficiently flexible to enable one to mount the vibrator screen in a curved condition or stressed condition so that the inherent tensile strength of the material assists in holding the vibratory plate screen in position. A further feature of the invention is the quick removal and securement of the vibratory plate screen.

Abstract: A screen panel center retainer system utilizes a center retainer that is provided with a retainer base which is adapted to be secured to screen stringer rails of a vibrating separatory machine. A pair of retainer channel legs form an upper portion of the center retainer and have screen panel edge receiving slots. A locking strip, having a wedging tongue, is used in conjunction with the center retainer. The wedging tongue is insertable into the channel on the center retainer which is defined by the two retainer channel legs. Flow control dams and cross dam retainers are used in conjunction with, and in addition to the center retainers and locking strips, to provide the complete installation of screen panels on the vibrating separating machine.

Abstract: The present invention provides a screen system (8) suitable for use in a vibratory screen apparatus (1), and comprising: a screen element (11) and a support frame (12) therefor, as well as novel screen elements (11) and mesh panels (19) therefor, and the use thereof. The screen element (11) consists essentially of a mesh panel (19) provided with first and second elongate support members (22, 23) extending along opposite end portions of the mesh panel (19). The support frame (12) has spaced apart first and second elongate frame elements (13, 14) for engagement with the screen element support members (22, 23) and further elongate frame elements (17, 18) extending there between for supporting the mesh panel (19).

Abstract: A tensioning apparatus for tensioning a screen in a vibrating screen separator of the type having a box structure defined by two opposing spaced-apart upright side walls separated by at least one screen bed support structure. Included is an actuator support mounted to an exterior surface of a side wall of a box structure for pivotally securing the stationary end of an actuator thereto. The actuator includes a movable end that is cyclically movable from a first releasing position adjacent the sidewall, to a second engaging position, transversely spaced apart from the side wall, responsive to a track follower moving along a track inclined transversely to the side wall of the box. A clamp rail assembly is fixed to the movable end of the actuator to engage and tension a screen responsive to transverse movement of the movable end of the actuator.